SemaDeclCXX.cpp revision fbb08b5ec01fbdeb6219fbba0f5edfd95c752233
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.pop_back_val(); 1253 } 1254 1255 return false; 1256} 1257 1258/// \brief Check the validity of a C++ base class specifier. 1259/// 1260/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1261/// and returns NULL otherwise. 1262CXXBaseSpecifier * 1263Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1264 SourceRange SpecifierRange, 1265 bool Virtual, AccessSpecifier Access, 1266 TypeSourceInfo *TInfo, 1267 SourceLocation EllipsisLoc) { 1268 QualType BaseType = TInfo->getType(); 1269 1270 // C++ [class.union]p1: 1271 // A union shall not have base classes. 1272 if (Class->isUnion()) { 1273 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1274 << SpecifierRange; 1275 return 0; 1276 } 1277 1278 if (EllipsisLoc.isValid() && 1279 !TInfo->getType()->containsUnexpandedParameterPack()) { 1280 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1281 << TInfo->getTypeLoc().getSourceRange(); 1282 EllipsisLoc = SourceLocation(); 1283 } 1284 1285 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1286 1287 if (BaseType->isDependentType()) { 1288 // Make sure that we don't have circular inheritance among our dependent 1289 // bases. For non-dependent bases, the check for completeness below handles 1290 // this. 1291 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1292 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1293 ((BaseDecl = BaseDecl->getDefinition()) && 1294 findCircularInheritance(Class, BaseDecl))) { 1295 Diag(BaseLoc, diag::err_circular_inheritance) 1296 << BaseType << Context.getTypeDeclType(Class); 1297 1298 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1299 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1300 << BaseType; 1301 1302 return 0; 1303 } 1304 } 1305 1306 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1307 Class->getTagKind() == TTK_Class, 1308 Access, TInfo, EllipsisLoc); 1309 } 1310 1311 // Base specifiers must be record types. 1312 if (!BaseType->isRecordType()) { 1313 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1314 return 0; 1315 } 1316 1317 // C++ [class.union]p1: 1318 // A union shall not be used as a base class. 1319 if (BaseType->isUnionType()) { 1320 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1321 return 0; 1322 } 1323 1324 // C++ [class.derived]p2: 1325 // The class-name in a base-specifier shall not be an incompletely 1326 // defined class. 1327 if (RequireCompleteType(BaseLoc, BaseType, 1328 diag::err_incomplete_base_class, SpecifierRange)) { 1329 Class->setInvalidDecl(); 1330 return 0; 1331 } 1332 1333 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1334 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1335 assert(BaseDecl && "Record type has no declaration"); 1336 BaseDecl = BaseDecl->getDefinition(); 1337 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1338 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1339 assert(CXXBaseDecl && "Base type is not a C++ type"); 1340 1341 // C++ [class]p3: 1342 // If a class is marked final and it appears as a base-type-specifier in 1343 // base-clause, the program is ill-formed. 1344 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1345 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1346 << CXXBaseDecl->getDeclName(); 1347 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1348 << CXXBaseDecl->getDeclName(); 1349 return 0; 1350 } 1351 1352 if (BaseDecl->isInvalidDecl()) 1353 Class->setInvalidDecl(); 1354 1355 // Create the base specifier. 1356 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1357 Class->getTagKind() == TTK_Class, 1358 Access, TInfo, EllipsisLoc); 1359} 1360 1361/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1362/// one entry in the base class list of a class specifier, for 1363/// example: 1364/// class foo : public bar, virtual private baz { 1365/// 'public bar' and 'virtual private baz' are each base-specifiers. 1366BaseResult 1367Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1368 ParsedAttributes &Attributes, 1369 bool Virtual, AccessSpecifier Access, 1370 ParsedType basetype, SourceLocation BaseLoc, 1371 SourceLocation EllipsisLoc) { 1372 if (!classdecl) 1373 return true; 1374 1375 AdjustDeclIfTemplate(classdecl); 1376 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1377 if (!Class) 1378 return true; 1379 1380 // We do not support any C++11 attributes on base-specifiers yet. 1381 // Diagnose any attributes we see. 1382 if (!Attributes.empty()) { 1383 for (AttributeList *Attr = Attributes.getList(); Attr; 1384 Attr = Attr->getNext()) { 1385 if (Attr->isInvalid() || 1386 Attr->getKind() == AttributeList::IgnoredAttribute) 1387 continue; 1388 Diag(Attr->getLoc(), 1389 Attr->getKind() == AttributeList::UnknownAttribute 1390 ? diag::warn_unknown_attribute_ignored 1391 : diag::err_base_specifier_attribute) 1392 << Attr->getName(); 1393 } 1394 } 1395 1396 TypeSourceInfo *TInfo = 0; 1397 GetTypeFromParser(basetype, &TInfo); 1398 1399 if (EllipsisLoc.isInvalid() && 1400 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1401 UPPC_BaseType)) 1402 return true; 1403 1404 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1405 Virtual, Access, TInfo, 1406 EllipsisLoc)) 1407 return BaseSpec; 1408 else 1409 Class->setInvalidDecl(); 1410 1411 return true; 1412} 1413 1414/// \brief Performs the actual work of attaching the given base class 1415/// specifiers to a C++ class. 1416bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1417 unsigned NumBases) { 1418 if (NumBases == 0) 1419 return false; 1420 1421 // Used to keep track of which base types we have already seen, so 1422 // that we can properly diagnose redundant direct base types. Note 1423 // that the key is always the unqualified canonical type of the base 1424 // class. 1425 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1426 1427 // Copy non-redundant base specifiers into permanent storage. 1428 unsigned NumGoodBases = 0; 1429 bool Invalid = false; 1430 for (unsigned idx = 0; idx < NumBases; ++idx) { 1431 QualType NewBaseType 1432 = Context.getCanonicalType(Bases[idx]->getType()); 1433 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1434 1435 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1436 if (KnownBase) { 1437 // C++ [class.mi]p3: 1438 // A class shall not be specified as a direct base class of a 1439 // derived class more than once. 1440 Diag(Bases[idx]->getLocStart(), 1441 diag::err_duplicate_base_class) 1442 << KnownBase->getType() 1443 << Bases[idx]->getSourceRange(); 1444 1445 // Delete the duplicate base class specifier; we're going to 1446 // overwrite its pointer later. 1447 Context.Deallocate(Bases[idx]); 1448 1449 Invalid = true; 1450 } else { 1451 // Okay, add this new base class. 1452 KnownBase = Bases[idx]; 1453 Bases[NumGoodBases++] = Bases[idx]; 1454 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1455 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1456 if (Class->isInterface() && 1457 (!RD->isInterface() || 1458 KnownBase->getAccessSpecifier() != AS_public)) { 1459 // The Microsoft extension __interface does not permit bases that 1460 // are not themselves public interfaces. 1461 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1462 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1463 << RD->getSourceRange(); 1464 Invalid = true; 1465 } 1466 if (RD->hasAttr<WeakAttr>()) 1467 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1468 } 1469 } 1470 } 1471 1472 // Attach the remaining base class specifiers to the derived class. 1473 Class->setBases(Bases, NumGoodBases); 1474 1475 // Delete the remaining (good) base class specifiers, since their 1476 // data has been copied into the CXXRecordDecl. 1477 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1478 Context.Deallocate(Bases[idx]); 1479 1480 return Invalid; 1481} 1482 1483/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1484/// class, after checking whether there are any duplicate base 1485/// classes. 1486void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1487 unsigned NumBases) { 1488 if (!ClassDecl || !Bases || !NumBases) 1489 return; 1490 1491 AdjustDeclIfTemplate(ClassDecl); 1492 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases, NumBases); 1493} 1494 1495/// \brief Determine whether the type \p Derived is a C++ class that is 1496/// derived from the type \p Base. 1497bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1498 if (!getLangOpts().CPlusPlus) 1499 return false; 1500 1501 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1502 if (!DerivedRD) 1503 return false; 1504 1505 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1506 if (!BaseRD) 1507 return false; 1508 1509 // If either the base or the derived type is invalid, don't try to 1510 // check whether one is derived from the other. 1511 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1512 return false; 1513 1514 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1515 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1516} 1517 1518/// \brief Determine whether the type \p Derived is a C++ class that is 1519/// derived from the type \p Base. 1520bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1521 if (!getLangOpts().CPlusPlus) 1522 return false; 1523 1524 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1525 if (!DerivedRD) 1526 return false; 1527 1528 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1529 if (!BaseRD) 1530 return false; 1531 1532 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1533} 1534 1535void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1536 CXXCastPath &BasePathArray) { 1537 assert(BasePathArray.empty() && "Base path array must be empty!"); 1538 assert(Paths.isRecordingPaths() && "Must record paths!"); 1539 1540 const CXXBasePath &Path = Paths.front(); 1541 1542 // We first go backward and check if we have a virtual base. 1543 // FIXME: It would be better if CXXBasePath had the base specifier for 1544 // the nearest virtual base. 1545 unsigned Start = 0; 1546 for (unsigned I = Path.size(); I != 0; --I) { 1547 if (Path[I - 1].Base->isVirtual()) { 1548 Start = I - 1; 1549 break; 1550 } 1551 } 1552 1553 // Now add all bases. 1554 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1555 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1556} 1557 1558/// \brief Determine whether the given base path includes a virtual 1559/// base class. 1560bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1561 for (CXXCastPath::const_iterator B = BasePath.begin(), 1562 BEnd = BasePath.end(); 1563 B != BEnd; ++B) 1564 if ((*B)->isVirtual()) 1565 return true; 1566 1567 return false; 1568} 1569 1570/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1571/// conversion (where Derived and Base are class types) is 1572/// well-formed, meaning that the conversion is unambiguous (and 1573/// that all of the base classes are accessible). Returns true 1574/// and emits a diagnostic if the code is ill-formed, returns false 1575/// otherwise. Loc is the location where this routine should point to 1576/// if there is an error, and Range is the source range to highlight 1577/// if there is an error. 1578bool 1579Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1580 unsigned InaccessibleBaseID, 1581 unsigned AmbigiousBaseConvID, 1582 SourceLocation Loc, SourceRange Range, 1583 DeclarationName Name, 1584 CXXCastPath *BasePath) { 1585 // First, determine whether the path from Derived to Base is 1586 // ambiguous. This is slightly more expensive than checking whether 1587 // the Derived to Base conversion exists, because here we need to 1588 // explore multiple paths to determine if there is an ambiguity. 1589 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1590 /*DetectVirtual=*/false); 1591 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1592 assert(DerivationOkay && 1593 "Can only be used with a derived-to-base conversion"); 1594 (void)DerivationOkay; 1595 1596 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1597 if (InaccessibleBaseID) { 1598 // Check that the base class can be accessed. 1599 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1600 InaccessibleBaseID)) { 1601 case AR_inaccessible: 1602 return true; 1603 case AR_accessible: 1604 case AR_dependent: 1605 case AR_delayed: 1606 break; 1607 } 1608 } 1609 1610 // Build a base path if necessary. 1611 if (BasePath) 1612 BuildBasePathArray(Paths, *BasePath); 1613 return false; 1614 } 1615 1616 if (AmbigiousBaseConvID) { 1617 // We know that the derived-to-base conversion is ambiguous, and 1618 // we're going to produce a diagnostic. Perform the derived-to-base 1619 // search just one more time to compute all of the possible paths so 1620 // that we can print them out. This is more expensive than any of 1621 // the previous derived-to-base checks we've done, but at this point 1622 // performance isn't as much of an issue. 1623 Paths.clear(); 1624 Paths.setRecordingPaths(true); 1625 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1626 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1627 (void)StillOkay; 1628 1629 // Build up a textual representation of the ambiguous paths, e.g., 1630 // D -> B -> A, that will be used to illustrate the ambiguous 1631 // conversions in the diagnostic. We only print one of the paths 1632 // to each base class subobject. 1633 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1634 1635 Diag(Loc, AmbigiousBaseConvID) 1636 << Derived << Base << PathDisplayStr << Range << Name; 1637 } 1638 return true; 1639} 1640 1641bool 1642Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1643 SourceLocation Loc, SourceRange Range, 1644 CXXCastPath *BasePath, 1645 bool IgnoreAccess) { 1646 return CheckDerivedToBaseConversion(Derived, Base, 1647 IgnoreAccess ? 0 1648 : diag::err_upcast_to_inaccessible_base, 1649 diag::err_ambiguous_derived_to_base_conv, 1650 Loc, Range, DeclarationName(), 1651 BasePath); 1652} 1653 1654 1655/// @brief Builds a string representing ambiguous paths from a 1656/// specific derived class to different subobjects of the same base 1657/// class. 1658/// 1659/// This function builds a string that can be used in error messages 1660/// to show the different paths that one can take through the 1661/// inheritance hierarchy to go from the derived class to different 1662/// subobjects of a base class. The result looks something like this: 1663/// @code 1664/// struct D -> struct B -> struct A 1665/// struct D -> struct C -> struct A 1666/// @endcode 1667std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1668 std::string PathDisplayStr; 1669 std::set<unsigned> DisplayedPaths; 1670 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1671 Path != Paths.end(); ++Path) { 1672 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1673 // We haven't displayed a path to this particular base 1674 // class subobject yet. 1675 PathDisplayStr += "\n "; 1676 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1677 for (CXXBasePath::const_iterator Element = Path->begin(); 1678 Element != Path->end(); ++Element) 1679 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1680 } 1681 } 1682 1683 return PathDisplayStr; 1684} 1685 1686//===----------------------------------------------------------------------===// 1687// C++ class member Handling 1688//===----------------------------------------------------------------------===// 1689 1690/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1691bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1692 SourceLocation ASLoc, 1693 SourceLocation ColonLoc, 1694 AttributeList *Attrs) { 1695 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1696 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1697 ASLoc, ColonLoc); 1698 CurContext->addHiddenDecl(ASDecl); 1699 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1700} 1701 1702/// CheckOverrideControl - Check C++11 override control semantics. 1703void Sema::CheckOverrideControl(NamedDecl *D) { 1704 if (D->isInvalidDecl()) 1705 return; 1706 1707 // We only care about "override" and "final" declarations. 1708 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) 1709 return; 1710 1711 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1712 1713 // We can't check dependent instance methods. 1714 if (MD && MD->isInstance() && 1715 (MD->getParent()->hasAnyDependentBases() || 1716 MD->getType()->isDependentType())) 1717 return; 1718 1719 if (MD && !MD->isVirtual()) { 1720 // If we have a non-virtual method, check if if hides a virtual method. 1721 // (In that case, it's most likely the method has the wrong type.) 1722 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 1723 FindHiddenVirtualMethods(MD, OverloadedMethods); 1724 1725 if (!OverloadedMethods.empty()) { 1726 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1727 Diag(OA->getLocation(), 1728 diag::override_keyword_hides_virtual_member_function) 1729 << "override" << (OverloadedMethods.size() > 1); 1730 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1731 Diag(FA->getLocation(), 1732 diag::override_keyword_hides_virtual_member_function) 1733 << "final" << (OverloadedMethods.size() > 1); 1734 } 1735 NoteHiddenVirtualMethods(MD, OverloadedMethods); 1736 MD->setInvalidDecl(); 1737 return; 1738 } 1739 // Fall through into the general case diagnostic. 1740 // FIXME: We might want to attempt typo correction here. 1741 } 1742 1743 if (!MD || !MD->isVirtual()) { 1744 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1745 Diag(OA->getLocation(), 1746 diag::override_keyword_only_allowed_on_virtual_member_functions) 1747 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1748 D->dropAttr<OverrideAttr>(); 1749 } 1750 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1751 Diag(FA->getLocation(), 1752 diag::override_keyword_only_allowed_on_virtual_member_functions) 1753 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1754 D->dropAttr<FinalAttr>(); 1755 } 1756 return; 1757 } 1758 1759 // C++11 [class.virtual]p5: 1760 // If a virtual function is marked with the virt-specifier override and 1761 // does not override a member function of a base class, the program is 1762 // ill-formed. 1763 bool HasOverriddenMethods = 1764 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1765 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1766 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1767 << MD->getDeclName(); 1768} 1769 1770/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1771/// function overrides a virtual member function marked 'final', according to 1772/// C++11 [class.virtual]p4. 1773bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1774 const CXXMethodDecl *Old) { 1775 if (!Old->hasAttr<FinalAttr>()) 1776 return false; 1777 1778 Diag(New->getLocation(), diag::err_final_function_overridden) 1779 << New->getDeclName(); 1780 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1781 return true; 1782} 1783 1784static bool InitializationHasSideEffects(const FieldDecl &FD) { 1785 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1786 // FIXME: Destruction of ObjC lifetime types has side-effects. 1787 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1788 return !RD->isCompleteDefinition() || 1789 !RD->hasTrivialDefaultConstructor() || 1790 !RD->hasTrivialDestructor(); 1791 return false; 1792} 1793 1794static AttributeList *getMSPropertyAttr(AttributeList *list) { 1795 for (AttributeList* it = list; it != 0; it = it->getNext()) 1796 if (it->isDeclspecPropertyAttribute()) 1797 return it; 1798 return 0; 1799} 1800 1801/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1802/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1803/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1804/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1805/// present (but parsing it has been deferred). 1806NamedDecl * 1807Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1808 MultiTemplateParamsArg TemplateParameterLists, 1809 Expr *BW, const VirtSpecifiers &VS, 1810 InClassInitStyle InitStyle) { 1811 const DeclSpec &DS = D.getDeclSpec(); 1812 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1813 DeclarationName Name = NameInfo.getName(); 1814 SourceLocation Loc = NameInfo.getLoc(); 1815 1816 // For anonymous bitfields, the location should point to the type. 1817 if (Loc.isInvalid()) 1818 Loc = D.getLocStart(); 1819 1820 Expr *BitWidth = static_cast<Expr*>(BW); 1821 1822 assert(isa<CXXRecordDecl>(CurContext)); 1823 assert(!DS.isFriendSpecified()); 1824 1825 bool isFunc = D.isDeclarationOfFunction(); 1826 1827 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1828 // The Microsoft extension __interface only permits public member functions 1829 // and prohibits constructors, destructors, operators, non-public member 1830 // functions, static methods and data members. 1831 unsigned InvalidDecl; 1832 bool ShowDeclName = true; 1833 if (!isFunc) 1834 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1835 else if (AS != AS_public) 1836 InvalidDecl = 2; 1837 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1838 InvalidDecl = 3; 1839 else switch (Name.getNameKind()) { 1840 case DeclarationName::CXXConstructorName: 1841 InvalidDecl = 4; 1842 ShowDeclName = false; 1843 break; 1844 1845 case DeclarationName::CXXDestructorName: 1846 InvalidDecl = 5; 1847 ShowDeclName = false; 1848 break; 1849 1850 case DeclarationName::CXXOperatorName: 1851 case DeclarationName::CXXConversionFunctionName: 1852 InvalidDecl = 6; 1853 break; 1854 1855 default: 1856 InvalidDecl = 0; 1857 break; 1858 } 1859 1860 if (InvalidDecl) { 1861 if (ShowDeclName) 1862 Diag(Loc, diag::err_invalid_member_in_interface) 1863 << (InvalidDecl-1) << Name; 1864 else 1865 Diag(Loc, diag::err_invalid_member_in_interface) 1866 << (InvalidDecl-1) << ""; 1867 return 0; 1868 } 1869 } 1870 1871 // C++ 9.2p6: A member shall not be declared to have automatic storage 1872 // duration (auto, register) or with the extern storage-class-specifier. 1873 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1874 // data members and cannot be applied to names declared const or static, 1875 // and cannot be applied to reference members. 1876 switch (DS.getStorageClassSpec()) { 1877 case DeclSpec::SCS_unspecified: 1878 case DeclSpec::SCS_typedef: 1879 case DeclSpec::SCS_static: 1880 break; 1881 case DeclSpec::SCS_mutable: 1882 if (isFunc) { 1883 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1884 1885 // FIXME: It would be nicer if the keyword was ignored only for this 1886 // declarator. Otherwise we could get follow-up errors. 1887 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1888 } 1889 break; 1890 default: 1891 Diag(DS.getStorageClassSpecLoc(), 1892 diag::err_storageclass_invalid_for_member); 1893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1894 break; 1895 } 1896 1897 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1898 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1899 !isFunc); 1900 1901 if (DS.isConstexprSpecified() && isInstField) { 1902 SemaDiagnosticBuilder B = 1903 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1904 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1905 if (InitStyle == ICIS_NoInit) { 1906 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1907 D.getMutableDeclSpec().ClearConstexprSpec(); 1908 const char *PrevSpec; 1909 unsigned DiagID; 1910 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1911 PrevSpec, DiagID, getLangOpts()); 1912 (void)Failed; 1913 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1914 } else { 1915 B << 1; 1916 const char *PrevSpec; 1917 unsigned DiagID; 1918 if (D.getMutableDeclSpec().SetStorageClassSpec( 1919 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1920 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1921 "This is the only DeclSpec that should fail to be applied"); 1922 B << 1; 1923 } else { 1924 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1925 isInstField = false; 1926 } 1927 } 1928 } 1929 1930 NamedDecl *Member; 1931 if (isInstField) { 1932 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1933 1934 // Data members must have identifiers for names. 1935 if (!Name.isIdentifier()) { 1936 Diag(Loc, diag::err_bad_variable_name) 1937 << Name; 1938 return 0; 1939 } 1940 1941 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1942 1943 // Member field could not be with "template" keyword. 1944 // So TemplateParameterLists should be empty in this case. 1945 if (TemplateParameterLists.size()) { 1946 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1947 if (TemplateParams->size()) { 1948 // There is no such thing as a member field template. 1949 Diag(D.getIdentifierLoc(), diag::err_template_member) 1950 << II 1951 << SourceRange(TemplateParams->getTemplateLoc(), 1952 TemplateParams->getRAngleLoc()); 1953 } else { 1954 // There is an extraneous 'template<>' for this member. 1955 Diag(TemplateParams->getTemplateLoc(), 1956 diag::err_template_member_noparams) 1957 << II 1958 << SourceRange(TemplateParams->getTemplateLoc(), 1959 TemplateParams->getRAngleLoc()); 1960 } 1961 return 0; 1962 } 1963 1964 if (SS.isSet() && !SS.isInvalid()) { 1965 // The user provided a superfluous scope specifier inside a class 1966 // definition: 1967 // 1968 // class X { 1969 // int X::member; 1970 // }; 1971 if (DeclContext *DC = computeDeclContext(SS, false)) 1972 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1973 else 1974 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1975 << Name << SS.getRange(); 1976 1977 SS.clear(); 1978 } 1979 1980 AttributeList *MSPropertyAttr = 1981 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1982 if (MSPropertyAttr) { 1983 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1984 BitWidth, InitStyle, AS, MSPropertyAttr); 1985 if (!Member) 1986 return 0; 1987 isInstField = false; 1988 } else { 1989 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1990 BitWidth, InitStyle, AS); 1991 assert(Member && "HandleField never returns null"); 1992 } 1993 } else { 1994 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1995 1996 Member = HandleDeclarator(S, D, TemplateParameterLists); 1997 if (!Member) 1998 return 0; 1999 2000 // Non-instance-fields can't have a bitfield. 2001 if (BitWidth) { 2002 if (Member->isInvalidDecl()) { 2003 // don't emit another diagnostic. 2004 } else if (isa<VarDecl>(Member)) { 2005 // C++ 9.6p3: A bit-field shall not be a static member. 2006 // "static member 'A' cannot be a bit-field" 2007 Diag(Loc, diag::err_static_not_bitfield) 2008 << Name << BitWidth->getSourceRange(); 2009 } else if (isa<TypedefDecl>(Member)) { 2010 // "typedef member 'x' cannot be a bit-field" 2011 Diag(Loc, diag::err_typedef_not_bitfield) 2012 << Name << BitWidth->getSourceRange(); 2013 } else { 2014 // A function typedef ("typedef int f(); f a;"). 2015 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 2016 Diag(Loc, diag::err_not_integral_type_bitfield) 2017 << Name << cast<ValueDecl>(Member)->getType() 2018 << BitWidth->getSourceRange(); 2019 } 2020 2021 BitWidth = 0; 2022 Member->setInvalidDecl(); 2023 } 2024 2025 Member->setAccess(AS); 2026 2027 // If we have declared a member function template or static data member 2028 // template, set the access of the templated declaration as well. 2029 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 2030 FunTmpl->getTemplatedDecl()->setAccess(AS); 2031 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) 2032 VarTmpl->getTemplatedDecl()->setAccess(AS); 2033 } 2034 2035 if (VS.isOverrideSpecified()) 2036 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 2037 if (VS.isFinalSpecified()) 2038 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 2039 2040 if (VS.getLastLocation().isValid()) { 2041 // Update the end location of a method that has a virt-specifiers. 2042 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 2043 MD->setRangeEnd(VS.getLastLocation()); 2044 } 2045 2046 CheckOverrideControl(Member); 2047 2048 assert((Name || isInstField) && "No identifier for non-field ?"); 2049 2050 if (isInstField) { 2051 FieldDecl *FD = cast<FieldDecl>(Member); 2052 FieldCollector->Add(FD); 2053 2054 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2055 FD->getLocation()) 2056 != DiagnosticsEngine::Ignored) { 2057 // Remember all explicit private FieldDecls that have a name, no side 2058 // effects and are not part of a dependent type declaration. 2059 if (!FD->isImplicit() && FD->getDeclName() && 2060 FD->getAccess() == AS_private && 2061 !FD->hasAttr<UnusedAttr>() && 2062 !FD->getParent()->isDependentContext() && 2063 !InitializationHasSideEffects(*FD)) 2064 UnusedPrivateFields.insert(FD); 2065 } 2066 } 2067 2068 return Member; 2069} 2070 2071namespace { 2072 class UninitializedFieldVisitor 2073 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2074 Sema &S; 2075 ValueDecl *VD; 2076 bool isReferenceType; 2077 public: 2078 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2079 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2080 S(S) { 2081 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 2082 this->VD = IFD->getAnonField(); 2083 else 2084 this->VD = VD; 2085 isReferenceType = this->VD->getType()->isReferenceType(); 2086 } 2087 2088 void HandleMemberExpr(MemberExpr *ME) { 2089 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2090 return; 2091 2092 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2093 // or union. 2094 MemberExpr *FieldME = ME; 2095 2096 Expr *Base = ME; 2097 while (isa<MemberExpr>(Base)) { 2098 ME = cast<MemberExpr>(Base); 2099 2100 if (isa<VarDecl>(ME->getMemberDecl())) 2101 return; 2102 2103 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2104 if (!FD->isAnonymousStructOrUnion()) 2105 FieldME = ME; 2106 2107 Base = ME->getBase(); 2108 } 2109 2110 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2111 unsigned diag = VD->getType()->isReferenceType() 2112 ? diag::warn_reference_field_is_uninit 2113 : diag::warn_field_is_uninit; 2114 S.Diag(FieldME->getExprLoc(), diag) << VD; 2115 } 2116 } 2117 2118 void HandleValue(Expr *E) { 2119 E = E->IgnoreParens(); 2120 2121 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2122 HandleMemberExpr(ME); 2123 return; 2124 } 2125 2126 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2127 HandleValue(CO->getTrueExpr()); 2128 HandleValue(CO->getFalseExpr()); 2129 return; 2130 } 2131 2132 if (BinaryConditionalOperator *BCO = 2133 dyn_cast<BinaryConditionalOperator>(E)) { 2134 HandleValue(BCO->getCommon()); 2135 HandleValue(BCO->getFalseExpr()); 2136 return; 2137 } 2138 2139 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2140 switch (BO->getOpcode()) { 2141 default: 2142 return; 2143 case(BO_PtrMemD): 2144 case(BO_PtrMemI): 2145 HandleValue(BO->getLHS()); 2146 return; 2147 case(BO_Comma): 2148 HandleValue(BO->getRHS()); 2149 return; 2150 } 2151 } 2152 } 2153 2154 void VisitMemberExpr(MemberExpr *ME) { 2155 if (isReferenceType) 2156 HandleMemberExpr(ME); 2157 2158 Inherited::VisitMemberExpr(ME); 2159 } 2160 2161 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2162 if (E->getCastKind() == CK_LValueToRValue) 2163 HandleValue(E->getSubExpr()); 2164 2165 Inherited::VisitImplicitCastExpr(E); 2166 } 2167 2168 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2169 if (E->getNumArgs() == 1) 2170 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(E->getArg(0))) 2171 if (ICE->getCastKind() == CK_NoOp) 2172 if (MemberExpr *ME = dyn_cast<MemberExpr>(ICE->getSubExpr())) 2173 HandleMemberExpr(ME); 2174 2175 Inherited::VisitCXXConstructExpr(E); 2176 } 2177 2178 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2179 Expr *Callee = E->getCallee(); 2180 if (isa<MemberExpr>(Callee)) 2181 HandleValue(Callee); 2182 2183 Inherited::VisitCXXMemberCallExpr(E); 2184 } 2185 }; 2186 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2187 ValueDecl *VD) { 2188 if (E) 2189 UninitializedFieldVisitor(S, VD).Visit(E); 2190 } 2191} // namespace 2192 2193/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2194/// in-class initializer for a non-static C++ class member, and after 2195/// instantiating an in-class initializer in a class template. Such actions 2196/// are deferred until the class is complete. 2197void 2198Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2199 Expr *InitExpr) { 2200 FieldDecl *FD = cast<FieldDecl>(D); 2201 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2202 "must set init style when field is created"); 2203 2204 if (!InitExpr) { 2205 FD->setInvalidDecl(); 2206 FD->removeInClassInitializer(); 2207 return; 2208 } 2209 2210 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2211 FD->setInvalidDecl(); 2212 FD->removeInClassInitializer(); 2213 return; 2214 } 2215 2216 ExprResult Init = InitExpr; 2217 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2218 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2219 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2220 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2221 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2222 InitializationSequence Seq(*this, Entity, Kind, InitExpr); 2223 Init = Seq.Perform(*this, Entity, Kind, InitExpr); 2224 if (Init.isInvalid()) { 2225 FD->setInvalidDecl(); 2226 return; 2227 } 2228 } 2229 2230 // C++11 [class.base.init]p7: 2231 // The initialization of each base and member constitutes a 2232 // full-expression. 2233 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2234 if (Init.isInvalid()) { 2235 FD->setInvalidDecl(); 2236 return; 2237 } 2238 2239 InitExpr = Init.release(); 2240 2241 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 2242 != DiagnosticsEngine::Ignored) { 2243 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 2244 } 2245 2246 FD->setInClassInitializer(InitExpr); 2247} 2248 2249/// \brief Find the direct and/or virtual base specifiers that 2250/// correspond to the given base type, for use in base initialization 2251/// within a constructor. 2252static bool FindBaseInitializer(Sema &SemaRef, 2253 CXXRecordDecl *ClassDecl, 2254 QualType BaseType, 2255 const CXXBaseSpecifier *&DirectBaseSpec, 2256 const CXXBaseSpecifier *&VirtualBaseSpec) { 2257 // First, check for a direct base class. 2258 DirectBaseSpec = 0; 2259 for (CXXRecordDecl::base_class_const_iterator Base 2260 = ClassDecl->bases_begin(); 2261 Base != ClassDecl->bases_end(); ++Base) { 2262 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2263 // We found a direct base of this type. That's what we're 2264 // initializing. 2265 DirectBaseSpec = &*Base; 2266 break; 2267 } 2268 } 2269 2270 // Check for a virtual base class. 2271 // FIXME: We might be able to short-circuit this if we know in advance that 2272 // there are no virtual bases. 2273 VirtualBaseSpec = 0; 2274 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2275 // We haven't found a base yet; search the class hierarchy for a 2276 // virtual base class. 2277 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2278 /*DetectVirtual=*/false); 2279 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2280 BaseType, Paths)) { 2281 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2282 Path != Paths.end(); ++Path) { 2283 if (Path->back().Base->isVirtual()) { 2284 VirtualBaseSpec = Path->back().Base; 2285 break; 2286 } 2287 } 2288 } 2289 } 2290 2291 return DirectBaseSpec || VirtualBaseSpec; 2292} 2293 2294/// \brief Handle a C++ member initializer using braced-init-list syntax. 2295MemInitResult 2296Sema::ActOnMemInitializer(Decl *ConstructorD, 2297 Scope *S, 2298 CXXScopeSpec &SS, 2299 IdentifierInfo *MemberOrBase, 2300 ParsedType TemplateTypeTy, 2301 const DeclSpec &DS, 2302 SourceLocation IdLoc, 2303 Expr *InitList, 2304 SourceLocation EllipsisLoc) { 2305 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2306 DS, IdLoc, InitList, 2307 EllipsisLoc); 2308} 2309 2310/// \brief Handle a C++ member initializer using parentheses syntax. 2311MemInitResult 2312Sema::ActOnMemInitializer(Decl *ConstructorD, 2313 Scope *S, 2314 CXXScopeSpec &SS, 2315 IdentifierInfo *MemberOrBase, 2316 ParsedType TemplateTypeTy, 2317 const DeclSpec &DS, 2318 SourceLocation IdLoc, 2319 SourceLocation LParenLoc, 2320 ArrayRef<Expr *> Args, 2321 SourceLocation RParenLoc, 2322 SourceLocation EllipsisLoc) { 2323 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2324 Args, RParenLoc); 2325 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2326 DS, IdLoc, List, EllipsisLoc); 2327} 2328 2329namespace { 2330 2331// Callback to only accept typo corrections that can be a valid C++ member 2332// intializer: either a non-static field member or a base class. 2333class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2334public: 2335 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2336 : ClassDecl(ClassDecl) {} 2337 2338 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 2339 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2340 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2341 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2342 return isa<TypeDecl>(ND); 2343 } 2344 return false; 2345 } 2346 2347private: 2348 CXXRecordDecl *ClassDecl; 2349}; 2350 2351} 2352 2353/// \brief Handle a C++ member initializer. 2354MemInitResult 2355Sema::BuildMemInitializer(Decl *ConstructorD, 2356 Scope *S, 2357 CXXScopeSpec &SS, 2358 IdentifierInfo *MemberOrBase, 2359 ParsedType TemplateTypeTy, 2360 const DeclSpec &DS, 2361 SourceLocation IdLoc, 2362 Expr *Init, 2363 SourceLocation EllipsisLoc) { 2364 if (!ConstructorD) 2365 return true; 2366 2367 AdjustDeclIfTemplate(ConstructorD); 2368 2369 CXXConstructorDecl *Constructor 2370 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2371 if (!Constructor) { 2372 // The user wrote a constructor initializer on a function that is 2373 // not a C++ constructor. Ignore the error for now, because we may 2374 // have more member initializers coming; we'll diagnose it just 2375 // once in ActOnMemInitializers. 2376 return true; 2377 } 2378 2379 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2380 2381 // C++ [class.base.init]p2: 2382 // Names in a mem-initializer-id are looked up in the scope of the 2383 // constructor's class and, if not found in that scope, are looked 2384 // up in the scope containing the constructor's definition. 2385 // [Note: if the constructor's class contains a member with the 2386 // same name as a direct or virtual base class of the class, a 2387 // mem-initializer-id naming the member or base class and composed 2388 // of a single identifier refers to the class member. A 2389 // mem-initializer-id for the hidden base class may be specified 2390 // using a qualified name. ] 2391 if (!SS.getScopeRep() && !TemplateTypeTy) { 2392 // Look for a member, first. 2393 DeclContext::lookup_result Result 2394 = ClassDecl->lookup(MemberOrBase); 2395 if (!Result.empty()) { 2396 ValueDecl *Member; 2397 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2398 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2399 if (EllipsisLoc.isValid()) 2400 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2401 << MemberOrBase 2402 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2403 2404 return BuildMemberInitializer(Member, Init, IdLoc); 2405 } 2406 } 2407 } 2408 // It didn't name a member, so see if it names a class. 2409 QualType BaseType; 2410 TypeSourceInfo *TInfo = 0; 2411 2412 if (TemplateTypeTy) { 2413 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2414 } else if (DS.getTypeSpecType() == TST_decltype) { 2415 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2416 } else { 2417 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2418 LookupParsedName(R, S, &SS); 2419 2420 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2421 if (!TyD) { 2422 if (R.isAmbiguous()) return true; 2423 2424 // We don't want access-control diagnostics here. 2425 R.suppressDiagnostics(); 2426 2427 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2428 bool NotUnknownSpecialization = false; 2429 DeclContext *DC = computeDeclContext(SS, false); 2430 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2431 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2432 2433 if (!NotUnknownSpecialization) { 2434 // When the scope specifier can refer to a member of an unknown 2435 // specialization, we take it as a type name. 2436 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2437 SS.getWithLocInContext(Context), 2438 *MemberOrBase, IdLoc); 2439 if (BaseType.isNull()) 2440 return true; 2441 2442 R.clear(); 2443 R.setLookupName(MemberOrBase); 2444 } 2445 } 2446 2447 // If no results were found, try to correct typos. 2448 TypoCorrection Corr; 2449 MemInitializerValidatorCCC Validator(ClassDecl); 2450 if (R.empty() && BaseType.isNull() && 2451 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2452 Validator, ClassDecl))) { 2453 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2454 // We have found a non-static data member with a similar 2455 // name to what was typed; complain and initialize that 2456 // member. 2457 diagnoseTypo(Corr, 2458 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2459 << MemberOrBase << true); 2460 return BuildMemberInitializer(Member, Init, IdLoc); 2461 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2462 const CXXBaseSpecifier *DirectBaseSpec; 2463 const CXXBaseSpecifier *VirtualBaseSpec; 2464 if (FindBaseInitializer(*this, ClassDecl, 2465 Context.getTypeDeclType(Type), 2466 DirectBaseSpec, VirtualBaseSpec)) { 2467 // We have found a direct or virtual base class with a 2468 // similar name to what was typed; complain and initialize 2469 // that base class. 2470 diagnoseTypo(Corr, 2471 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2472 << MemberOrBase << false, 2473 PDiag() /*Suppress note, we provide our own.*/); 2474 2475 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec 2476 : VirtualBaseSpec; 2477 Diag(BaseSpec->getLocStart(), 2478 diag::note_base_class_specified_here) 2479 << BaseSpec->getType() 2480 << BaseSpec->getSourceRange(); 2481 2482 TyD = Type; 2483 } 2484 } 2485 } 2486 2487 if (!TyD && BaseType.isNull()) { 2488 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2489 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2490 return true; 2491 } 2492 } 2493 2494 if (BaseType.isNull()) { 2495 BaseType = Context.getTypeDeclType(TyD); 2496 if (SS.isSet()) { 2497 NestedNameSpecifier *Qualifier = 2498 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2499 2500 // FIXME: preserve source range information 2501 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2502 } 2503 } 2504 } 2505 2506 if (!TInfo) 2507 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2508 2509 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2510} 2511 2512/// Checks a member initializer expression for cases where reference (or 2513/// pointer) members are bound to by-value parameters (or their addresses). 2514static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2515 Expr *Init, 2516 SourceLocation IdLoc) { 2517 QualType MemberTy = Member->getType(); 2518 2519 // We only handle pointers and references currently. 2520 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2521 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2522 return; 2523 2524 const bool IsPointer = MemberTy->isPointerType(); 2525 if (IsPointer) { 2526 if (const UnaryOperator *Op 2527 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2528 // The only case we're worried about with pointers requires taking the 2529 // address. 2530 if (Op->getOpcode() != UO_AddrOf) 2531 return; 2532 2533 Init = Op->getSubExpr(); 2534 } else { 2535 // We only handle address-of expression initializers for pointers. 2536 return; 2537 } 2538 } 2539 2540 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2541 // We only warn when referring to a non-reference parameter declaration. 2542 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2543 if (!Parameter || Parameter->getType()->isReferenceType()) 2544 return; 2545 2546 S.Diag(Init->getExprLoc(), 2547 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2548 : diag::warn_bind_ref_member_to_parameter) 2549 << Member << Parameter << Init->getSourceRange(); 2550 } else { 2551 // Other initializers are fine. 2552 return; 2553 } 2554 2555 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2556 << (unsigned)IsPointer; 2557} 2558 2559MemInitResult 2560Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2561 SourceLocation IdLoc) { 2562 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2563 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2564 assert((DirectMember || IndirectMember) && 2565 "Member must be a FieldDecl or IndirectFieldDecl"); 2566 2567 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2568 return true; 2569 2570 if (Member->isInvalidDecl()) 2571 return true; 2572 2573 MultiExprArg Args; 2574 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2575 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2576 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2577 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); 2578 } else { 2579 // Template instantiation doesn't reconstruct ParenListExprs for us. 2580 Args = Init; 2581 } 2582 2583 SourceRange InitRange = Init->getSourceRange(); 2584 2585 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2586 // Can't check initialization for a member of dependent type or when 2587 // any of the arguments are type-dependent expressions. 2588 DiscardCleanupsInEvaluationContext(); 2589 } else { 2590 bool InitList = false; 2591 if (isa<InitListExpr>(Init)) { 2592 InitList = true; 2593 Args = Init; 2594 } 2595 2596 // Initialize the member. 2597 InitializedEntity MemberEntity = 2598 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2599 : InitializedEntity::InitializeMember(IndirectMember, 0); 2600 InitializationKind Kind = 2601 InitList ? InitializationKind::CreateDirectList(IdLoc) 2602 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2603 InitRange.getEnd()); 2604 2605 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); 2606 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0); 2607 if (MemberInit.isInvalid()) 2608 return true; 2609 2610 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc); 2611 2612 // C++11 [class.base.init]p7: 2613 // The initialization of each base and member constitutes a 2614 // full-expression. 2615 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2616 if (MemberInit.isInvalid()) 2617 return true; 2618 2619 Init = MemberInit.get(); 2620 } 2621 2622 // Diagnose value-uses of fields to initialize themselves, e.g. 2623 // foo(foo) 2624 // where foo is not also a parameter to the constructor. 2625 // TODO: implement -Wuninitialized and fold this into that framework. 2626 // FIXME: Warn about the case when other fields are used before being 2627 // initialized. For example, let this field be the i'th field. When 2628 // initializing the i'th field, throw a warning if any of the >= i'th 2629 // fields are used, as they are not yet initialized. 2630 // Right now we are only handling the case where the i'th field uses 2631 // itself in its initializer. 2632 // Also need to take into account that some fields may be initialized by 2633 // in-class initializers, see C++11 [class.base.init]p9. 2634 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2635 != DiagnosticsEngine::Ignored) { 2636 CheckInitExprContainsUninitializedFields(*this, Init, Member); 2637 } 2638 2639 if (DirectMember) { 2640 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2641 InitRange.getBegin(), Init, 2642 InitRange.getEnd()); 2643 } else { 2644 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2645 InitRange.getBegin(), Init, 2646 InitRange.getEnd()); 2647 } 2648} 2649 2650MemInitResult 2651Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2652 CXXRecordDecl *ClassDecl) { 2653 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2654 if (!LangOpts.CPlusPlus11) 2655 return Diag(NameLoc, diag::err_delegating_ctor) 2656 << TInfo->getTypeLoc().getLocalSourceRange(); 2657 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2658 2659 bool InitList = true; 2660 MultiExprArg Args = Init; 2661 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2662 InitList = false; 2663 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2664 } 2665 2666 SourceRange InitRange = Init->getSourceRange(); 2667 // Initialize the object. 2668 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2669 QualType(ClassDecl->getTypeForDecl(), 0)); 2670 InitializationKind Kind = 2671 InitList ? InitializationKind::CreateDirectList(NameLoc) 2672 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2673 InitRange.getEnd()); 2674 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); 2675 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2676 Args, 0); 2677 if (DelegationInit.isInvalid()) 2678 return true; 2679 2680 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2681 "Delegating constructor with no target?"); 2682 2683 // C++11 [class.base.init]p7: 2684 // The initialization of each base and member constitutes a 2685 // full-expression. 2686 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2687 InitRange.getBegin()); 2688 if (DelegationInit.isInvalid()) 2689 return true; 2690 2691 // If we are in a dependent context, template instantiation will 2692 // perform this type-checking again. Just save the arguments that we 2693 // received in a ParenListExpr. 2694 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2695 // of the information that we have about the base 2696 // initializer. However, deconstructing the ASTs is a dicey process, 2697 // and this approach is far more likely to get the corner cases right. 2698 if (CurContext->isDependentContext()) 2699 DelegationInit = Owned(Init); 2700 2701 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2702 DelegationInit.takeAs<Expr>(), 2703 InitRange.getEnd()); 2704} 2705 2706MemInitResult 2707Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2708 Expr *Init, CXXRecordDecl *ClassDecl, 2709 SourceLocation EllipsisLoc) { 2710 SourceLocation BaseLoc 2711 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2712 2713 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2714 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2715 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2716 2717 // C++ [class.base.init]p2: 2718 // [...] Unless the mem-initializer-id names a nonstatic data 2719 // member of the constructor's class or a direct or virtual base 2720 // of that class, the mem-initializer is ill-formed. A 2721 // mem-initializer-list can initialize a base class using any 2722 // name that denotes that base class type. 2723 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2724 2725 SourceRange InitRange = Init->getSourceRange(); 2726 if (EllipsisLoc.isValid()) { 2727 // This is a pack expansion. 2728 if (!BaseType->containsUnexpandedParameterPack()) { 2729 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2730 << SourceRange(BaseLoc, InitRange.getEnd()); 2731 2732 EllipsisLoc = SourceLocation(); 2733 } 2734 } else { 2735 // Check for any unexpanded parameter packs. 2736 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2737 return true; 2738 2739 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2740 return true; 2741 } 2742 2743 // Check for direct and virtual base classes. 2744 const CXXBaseSpecifier *DirectBaseSpec = 0; 2745 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2746 if (!Dependent) { 2747 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2748 BaseType)) 2749 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2750 2751 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2752 VirtualBaseSpec); 2753 2754 // C++ [base.class.init]p2: 2755 // Unless the mem-initializer-id names a nonstatic data member of the 2756 // constructor's class or a direct or virtual base of that class, the 2757 // mem-initializer is ill-formed. 2758 if (!DirectBaseSpec && !VirtualBaseSpec) { 2759 // If the class has any dependent bases, then it's possible that 2760 // one of those types will resolve to the same type as 2761 // BaseType. Therefore, just treat this as a dependent base 2762 // class initialization. FIXME: Should we try to check the 2763 // initialization anyway? It seems odd. 2764 if (ClassDecl->hasAnyDependentBases()) 2765 Dependent = true; 2766 else 2767 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2768 << BaseType << Context.getTypeDeclType(ClassDecl) 2769 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2770 } 2771 } 2772 2773 if (Dependent) { 2774 DiscardCleanupsInEvaluationContext(); 2775 2776 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2777 /*IsVirtual=*/false, 2778 InitRange.getBegin(), Init, 2779 InitRange.getEnd(), EllipsisLoc); 2780 } 2781 2782 // C++ [base.class.init]p2: 2783 // If a mem-initializer-id is ambiguous because it designates both 2784 // a direct non-virtual base class and an inherited virtual base 2785 // class, the mem-initializer is ill-formed. 2786 if (DirectBaseSpec && VirtualBaseSpec) 2787 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2788 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2789 2790 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; 2791 if (!BaseSpec) 2792 BaseSpec = VirtualBaseSpec; 2793 2794 // Initialize the base. 2795 bool InitList = true; 2796 MultiExprArg Args = Init; 2797 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2798 InitList = false; 2799 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2800 } 2801 2802 InitializedEntity BaseEntity = 2803 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2804 InitializationKind Kind = 2805 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2806 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2807 InitRange.getEnd()); 2808 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); 2809 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0); 2810 if (BaseInit.isInvalid()) 2811 return true; 2812 2813 // C++11 [class.base.init]p7: 2814 // The initialization of each base and member constitutes a 2815 // full-expression. 2816 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2817 if (BaseInit.isInvalid()) 2818 return true; 2819 2820 // If we are in a dependent context, template instantiation will 2821 // perform this type-checking again. Just save the arguments that we 2822 // received in a ParenListExpr. 2823 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2824 // of the information that we have about the base 2825 // initializer. However, deconstructing the ASTs is a dicey process, 2826 // and this approach is far more likely to get the corner cases right. 2827 if (CurContext->isDependentContext()) 2828 BaseInit = Owned(Init); 2829 2830 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2831 BaseSpec->isVirtual(), 2832 InitRange.getBegin(), 2833 BaseInit.takeAs<Expr>(), 2834 InitRange.getEnd(), EllipsisLoc); 2835} 2836 2837// Create a static_cast\<T&&>(expr). 2838static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2839 if (T.isNull()) T = E->getType(); 2840 QualType TargetType = SemaRef.BuildReferenceType( 2841 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2842 SourceLocation ExprLoc = E->getLocStart(); 2843 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2844 TargetType, ExprLoc); 2845 2846 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2847 SourceRange(ExprLoc, ExprLoc), 2848 E->getSourceRange()).take(); 2849} 2850 2851/// ImplicitInitializerKind - How an implicit base or member initializer should 2852/// initialize its base or member. 2853enum ImplicitInitializerKind { 2854 IIK_Default, 2855 IIK_Copy, 2856 IIK_Move, 2857 IIK_Inherit 2858}; 2859 2860static bool 2861BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2862 ImplicitInitializerKind ImplicitInitKind, 2863 CXXBaseSpecifier *BaseSpec, 2864 bool IsInheritedVirtualBase, 2865 CXXCtorInitializer *&CXXBaseInit) { 2866 InitializedEntity InitEntity 2867 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2868 IsInheritedVirtualBase); 2869 2870 ExprResult BaseInit; 2871 2872 switch (ImplicitInitKind) { 2873 case IIK_Inherit: { 2874 const CXXRecordDecl *Inherited = 2875 Constructor->getInheritedConstructor()->getParent(); 2876 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2877 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2878 // C++11 [class.inhctor]p8: 2879 // Each expression in the expression-list is of the form 2880 // static_cast<T&&>(p), where p is the name of the corresponding 2881 // constructor parameter and T is the declared type of p. 2882 SmallVector<Expr*, 16> Args; 2883 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2884 ParmVarDecl *PD = Constructor->getParamDecl(I); 2885 ExprResult ArgExpr = 2886 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2887 VK_LValue, SourceLocation()); 2888 if (ArgExpr.isInvalid()) 2889 return true; 2890 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2891 } 2892 2893 InitializationKind InitKind = InitializationKind::CreateDirect( 2894 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2895 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args); 2896 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2897 break; 2898 } 2899 } 2900 // Fall through. 2901 case IIK_Default: { 2902 InitializationKind InitKind 2903 = InitializationKind::CreateDefault(Constructor->getLocation()); 2904 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 2905 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 2906 break; 2907 } 2908 2909 case IIK_Move: 2910 case IIK_Copy: { 2911 bool Moving = ImplicitInitKind == IIK_Move; 2912 ParmVarDecl *Param = Constructor->getParamDecl(0); 2913 QualType ParamType = Param->getType().getNonReferenceType(); 2914 2915 Expr *CopyCtorArg = 2916 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2917 SourceLocation(), Param, false, 2918 Constructor->getLocation(), ParamType, 2919 VK_LValue, 0); 2920 2921 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2922 2923 // Cast to the base class to avoid ambiguities. 2924 QualType ArgTy = 2925 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2926 ParamType.getQualifiers()); 2927 2928 if (Moving) { 2929 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2930 } 2931 2932 CXXCastPath BasePath; 2933 BasePath.push_back(BaseSpec); 2934 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2935 CK_UncheckedDerivedToBase, 2936 Moving ? VK_XValue : VK_LValue, 2937 &BasePath).take(); 2938 2939 InitializationKind InitKind 2940 = InitializationKind::CreateDirect(Constructor->getLocation(), 2941 SourceLocation(), SourceLocation()); 2942 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); 2943 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); 2944 break; 2945 } 2946 } 2947 2948 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2949 if (BaseInit.isInvalid()) 2950 return true; 2951 2952 CXXBaseInit = 2953 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2954 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2955 SourceLocation()), 2956 BaseSpec->isVirtual(), 2957 SourceLocation(), 2958 BaseInit.takeAs<Expr>(), 2959 SourceLocation(), 2960 SourceLocation()); 2961 2962 return false; 2963} 2964 2965static bool RefersToRValueRef(Expr *MemRef) { 2966 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2967 return Referenced->getType()->isRValueReferenceType(); 2968} 2969 2970static bool 2971BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2972 ImplicitInitializerKind ImplicitInitKind, 2973 FieldDecl *Field, IndirectFieldDecl *Indirect, 2974 CXXCtorInitializer *&CXXMemberInit) { 2975 if (Field->isInvalidDecl()) 2976 return true; 2977 2978 SourceLocation Loc = Constructor->getLocation(); 2979 2980 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2981 bool Moving = ImplicitInitKind == IIK_Move; 2982 ParmVarDecl *Param = Constructor->getParamDecl(0); 2983 QualType ParamType = Param->getType().getNonReferenceType(); 2984 2985 // Suppress copying zero-width bitfields. 2986 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2987 return false; 2988 2989 Expr *MemberExprBase = 2990 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2991 SourceLocation(), Param, false, 2992 Loc, ParamType, VK_LValue, 0); 2993 2994 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2995 2996 if (Moving) { 2997 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2998 } 2999 3000 // Build a reference to this field within the parameter. 3001 CXXScopeSpec SS; 3002 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 3003 Sema::LookupMemberName); 3004 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 3005 : cast<ValueDecl>(Field), AS_public); 3006 MemberLookup.resolveKind(); 3007 ExprResult CtorArg 3008 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 3009 ParamType, Loc, 3010 /*IsArrow=*/false, 3011 SS, 3012 /*TemplateKWLoc=*/SourceLocation(), 3013 /*FirstQualifierInScope=*/0, 3014 MemberLookup, 3015 /*TemplateArgs=*/0); 3016 if (CtorArg.isInvalid()) 3017 return true; 3018 3019 // C++11 [class.copy]p15: 3020 // - if a member m has rvalue reference type T&&, it is direct-initialized 3021 // with static_cast<T&&>(x.m); 3022 if (RefersToRValueRef(CtorArg.get())) { 3023 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3024 } 3025 3026 // When the field we are copying is an array, create index variables for 3027 // each dimension of the array. We use these index variables to subscript 3028 // the source array, and other clients (e.g., CodeGen) will perform the 3029 // necessary iteration with these index variables. 3030 SmallVector<VarDecl *, 4> IndexVariables; 3031 QualType BaseType = Field->getType(); 3032 QualType SizeType = SemaRef.Context.getSizeType(); 3033 bool InitializingArray = false; 3034 while (const ConstantArrayType *Array 3035 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 3036 InitializingArray = true; 3037 // Create the iteration variable for this array index. 3038 IdentifierInfo *IterationVarName = 0; 3039 { 3040 SmallString<8> Str; 3041 llvm::raw_svector_ostream OS(Str); 3042 OS << "__i" << IndexVariables.size(); 3043 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 3044 } 3045 VarDecl *IterationVar 3046 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 3047 IterationVarName, SizeType, 3048 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 3049 SC_None); 3050 IndexVariables.push_back(IterationVar); 3051 3052 // Create a reference to the iteration variable. 3053 ExprResult IterationVarRef 3054 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 3055 assert(!IterationVarRef.isInvalid() && 3056 "Reference to invented variable cannot fail!"); 3057 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 3058 assert(!IterationVarRef.isInvalid() && 3059 "Conversion of invented variable cannot fail!"); 3060 3061 // Subscript the array with this iteration variable. 3062 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3063 IterationVarRef.take(), 3064 Loc); 3065 if (CtorArg.isInvalid()) 3066 return true; 3067 3068 BaseType = Array->getElementType(); 3069 } 3070 3071 // The array subscript expression is an lvalue, which is wrong for moving. 3072 if (Moving && InitializingArray) 3073 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3074 3075 // Construct the entity that we will be initializing. For an array, this 3076 // will be first element in the array, which may require several levels 3077 // of array-subscript entities. 3078 SmallVector<InitializedEntity, 4> Entities; 3079 Entities.reserve(1 + IndexVariables.size()); 3080 if (Indirect) 3081 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3082 else 3083 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3084 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3085 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3086 0, 3087 Entities.back())); 3088 3089 // Direct-initialize to use the copy constructor. 3090 InitializationKind InitKind = 3091 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3092 3093 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3094 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE); 3095 3096 ExprResult MemberInit 3097 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3098 MultiExprArg(&CtorArgE, 1)); 3099 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3100 if (MemberInit.isInvalid()) 3101 return true; 3102 3103 if (Indirect) { 3104 assert(IndexVariables.size() == 0 && 3105 "Indirect field improperly initialized"); 3106 CXXMemberInit 3107 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3108 Loc, Loc, 3109 MemberInit.takeAs<Expr>(), 3110 Loc); 3111 } else 3112 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3113 Loc, MemberInit.takeAs<Expr>(), 3114 Loc, 3115 IndexVariables.data(), 3116 IndexVariables.size()); 3117 return false; 3118 } 3119 3120 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3121 "Unhandled implicit init kind!"); 3122 3123 QualType FieldBaseElementType = 3124 SemaRef.Context.getBaseElementType(Field->getType()); 3125 3126 if (FieldBaseElementType->isRecordType()) { 3127 InitializedEntity InitEntity 3128 = Indirect? InitializedEntity::InitializeMember(Indirect) 3129 : InitializedEntity::InitializeMember(Field); 3130 InitializationKind InitKind = 3131 InitializationKind::CreateDefault(Loc); 3132 3133 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3134 ExprResult MemberInit = 3135 InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3136 3137 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3138 if (MemberInit.isInvalid()) 3139 return true; 3140 3141 if (Indirect) 3142 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3143 Indirect, Loc, 3144 Loc, 3145 MemberInit.get(), 3146 Loc); 3147 else 3148 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3149 Field, Loc, Loc, 3150 MemberInit.get(), 3151 Loc); 3152 return false; 3153 } 3154 3155 if (!Field->getParent()->isUnion()) { 3156 if (FieldBaseElementType->isReferenceType()) { 3157 SemaRef.Diag(Constructor->getLocation(), 3158 diag::err_uninitialized_member_in_ctor) 3159 << (int)Constructor->isImplicit() 3160 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3161 << 0 << Field->getDeclName(); 3162 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3163 return true; 3164 } 3165 3166 if (FieldBaseElementType.isConstQualified()) { 3167 SemaRef.Diag(Constructor->getLocation(), 3168 diag::err_uninitialized_member_in_ctor) 3169 << (int)Constructor->isImplicit() 3170 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3171 << 1 << Field->getDeclName(); 3172 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3173 return true; 3174 } 3175 } 3176 3177 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3178 FieldBaseElementType->isObjCRetainableType() && 3179 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3180 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3181 // ARC: 3182 // Default-initialize Objective-C pointers to NULL. 3183 CXXMemberInit 3184 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3185 Loc, Loc, 3186 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3187 Loc); 3188 return false; 3189 } 3190 3191 // Nothing to initialize. 3192 CXXMemberInit = 0; 3193 return false; 3194} 3195 3196namespace { 3197struct BaseAndFieldInfo { 3198 Sema &S; 3199 CXXConstructorDecl *Ctor; 3200 bool AnyErrorsInInits; 3201 ImplicitInitializerKind IIK; 3202 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3203 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3204 3205 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3206 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3207 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3208 if (Generated && Ctor->isCopyConstructor()) 3209 IIK = IIK_Copy; 3210 else if (Generated && Ctor->isMoveConstructor()) 3211 IIK = IIK_Move; 3212 else if (Ctor->getInheritedConstructor()) 3213 IIK = IIK_Inherit; 3214 else 3215 IIK = IIK_Default; 3216 } 3217 3218 bool isImplicitCopyOrMove() const { 3219 switch (IIK) { 3220 case IIK_Copy: 3221 case IIK_Move: 3222 return true; 3223 3224 case IIK_Default: 3225 case IIK_Inherit: 3226 return false; 3227 } 3228 3229 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3230 } 3231 3232 bool addFieldInitializer(CXXCtorInitializer *Init) { 3233 AllToInit.push_back(Init); 3234 3235 // Check whether this initializer makes the field "used". 3236 if (Init->getInit()->HasSideEffects(S.Context)) 3237 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3238 3239 return false; 3240 } 3241}; 3242} 3243 3244/// \brief Determine whether the given indirect field declaration is somewhere 3245/// within an anonymous union. 3246static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3247 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3248 CEnd = F->chain_end(); 3249 C != CEnd; ++C) 3250 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3251 if (Record->isUnion()) 3252 return true; 3253 3254 return false; 3255} 3256 3257/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3258/// array type. 3259static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3260 if (T->isIncompleteArrayType()) 3261 return true; 3262 3263 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3264 if (!ArrayT->getSize()) 3265 return true; 3266 3267 T = ArrayT->getElementType(); 3268 } 3269 3270 return false; 3271} 3272 3273static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3274 FieldDecl *Field, 3275 IndirectFieldDecl *Indirect = 0) { 3276 if (Field->isInvalidDecl()) 3277 return false; 3278 3279 // Overwhelmingly common case: we have a direct initializer for this field. 3280 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3281 return Info.addFieldInitializer(Init); 3282 3283 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3284 // has a brace-or-equal-initializer, the entity is initialized as specified 3285 // in [dcl.init]. 3286 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3287 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3288 Info.Ctor->getLocation(), Field); 3289 CXXCtorInitializer *Init; 3290 if (Indirect) 3291 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3292 SourceLocation(), 3293 SourceLocation(), DIE, 3294 SourceLocation()); 3295 else 3296 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3297 SourceLocation(), 3298 SourceLocation(), DIE, 3299 SourceLocation()); 3300 return Info.addFieldInitializer(Init); 3301 } 3302 3303 // Don't build an implicit initializer for union members if none was 3304 // explicitly specified. 3305 if (Field->getParent()->isUnion() || 3306 (Indirect && isWithinAnonymousUnion(Indirect))) 3307 return false; 3308 3309 // Don't initialize incomplete or zero-length arrays. 3310 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3311 return false; 3312 3313 // Don't try to build an implicit initializer if there were semantic 3314 // errors in any of the initializers (and therefore we might be 3315 // missing some that the user actually wrote). 3316 if (Info.AnyErrorsInInits) 3317 return false; 3318 3319 CXXCtorInitializer *Init = 0; 3320 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3321 Indirect, Init)) 3322 return true; 3323 3324 if (!Init) 3325 return false; 3326 3327 return Info.addFieldInitializer(Init); 3328} 3329 3330bool 3331Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3332 CXXCtorInitializer *Initializer) { 3333 assert(Initializer->isDelegatingInitializer()); 3334 Constructor->setNumCtorInitializers(1); 3335 CXXCtorInitializer **initializer = 3336 new (Context) CXXCtorInitializer*[1]; 3337 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3338 Constructor->setCtorInitializers(initializer); 3339 3340 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3341 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3342 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3343 } 3344 3345 DelegatingCtorDecls.push_back(Constructor); 3346 3347 return false; 3348} 3349 3350bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3351 ArrayRef<CXXCtorInitializer *> Initializers) { 3352 if (Constructor->isDependentContext()) { 3353 // Just store the initializers as written, they will be checked during 3354 // instantiation. 3355 if (!Initializers.empty()) { 3356 Constructor->setNumCtorInitializers(Initializers.size()); 3357 CXXCtorInitializer **baseOrMemberInitializers = 3358 new (Context) CXXCtorInitializer*[Initializers.size()]; 3359 memcpy(baseOrMemberInitializers, Initializers.data(), 3360 Initializers.size() * sizeof(CXXCtorInitializer*)); 3361 Constructor->setCtorInitializers(baseOrMemberInitializers); 3362 } 3363 3364 // Let template instantiation know whether we had errors. 3365 if (AnyErrors) 3366 Constructor->setInvalidDecl(); 3367 3368 return false; 3369 } 3370 3371 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3372 3373 // We need to build the initializer AST according to order of construction 3374 // and not what user specified in the Initializers list. 3375 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3376 if (!ClassDecl) 3377 return true; 3378 3379 bool HadError = false; 3380 3381 for (unsigned i = 0; i < Initializers.size(); i++) { 3382 CXXCtorInitializer *Member = Initializers[i]; 3383 3384 if (Member->isBaseInitializer()) 3385 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3386 else 3387 Info.AllBaseFields[Member->getAnyMember()] = Member; 3388 } 3389 3390 // Keep track of the direct virtual bases. 3391 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3392 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3393 E = ClassDecl->bases_end(); I != E; ++I) { 3394 if (I->isVirtual()) 3395 DirectVBases.insert(I); 3396 } 3397 3398 // Push virtual bases before others. 3399 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3400 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3401 3402 if (CXXCtorInitializer *Value 3403 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3404 // [class.base.init]p7, per DR257: 3405 // A mem-initializer where the mem-initializer-id names a virtual base 3406 // class is ignored during execution of a constructor of any class that 3407 // is not the most derived class. 3408 if (ClassDecl->isAbstract()) { 3409 // FIXME: Provide a fixit to remove the base specifier. This requires 3410 // tracking the location of the associated comma for a base specifier. 3411 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) 3412 << VBase->getType() << ClassDecl; 3413 DiagnoseAbstractType(ClassDecl); 3414 } 3415 3416 Info.AllToInit.push_back(Value); 3417 } else if (!AnyErrors && !ClassDecl->isAbstract()) { 3418 // [class.base.init]p8, per DR257: 3419 // If a given [...] base class is not named by a mem-initializer-id 3420 // [...] and the entity is not a virtual base class of an abstract 3421 // class, then [...] the entity is default-initialized. 3422 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3423 CXXCtorInitializer *CXXBaseInit; 3424 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3425 VBase, IsInheritedVirtualBase, 3426 CXXBaseInit)) { 3427 HadError = true; 3428 continue; 3429 } 3430 3431 Info.AllToInit.push_back(CXXBaseInit); 3432 } 3433 } 3434 3435 // Non-virtual bases. 3436 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3437 E = ClassDecl->bases_end(); Base != E; ++Base) { 3438 // Virtuals are in the virtual base list and already constructed. 3439 if (Base->isVirtual()) 3440 continue; 3441 3442 if (CXXCtorInitializer *Value 3443 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3444 Info.AllToInit.push_back(Value); 3445 } else if (!AnyErrors) { 3446 CXXCtorInitializer *CXXBaseInit; 3447 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3448 Base, /*IsInheritedVirtualBase=*/false, 3449 CXXBaseInit)) { 3450 HadError = true; 3451 continue; 3452 } 3453 3454 Info.AllToInit.push_back(CXXBaseInit); 3455 } 3456 } 3457 3458 // Fields. 3459 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3460 MemEnd = ClassDecl->decls_end(); 3461 Mem != MemEnd; ++Mem) { 3462 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3463 // C++ [class.bit]p2: 3464 // A declaration for a bit-field that omits the identifier declares an 3465 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3466 // initialized. 3467 if (F->isUnnamedBitfield()) 3468 continue; 3469 3470 // If we're not generating the implicit copy/move constructor, then we'll 3471 // handle anonymous struct/union fields based on their individual 3472 // indirect fields. 3473 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3474 continue; 3475 3476 if (CollectFieldInitializer(*this, Info, F)) 3477 HadError = true; 3478 continue; 3479 } 3480 3481 // Beyond this point, we only consider default initialization. 3482 if (Info.isImplicitCopyOrMove()) 3483 continue; 3484 3485 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3486 if (F->getType()->isIncompleteArrayType()) { 3487 assert(ClassDecl->hasFlexibleArrayMember() && 3488 "Incomplete array type is not valid"); 3489 continue; 3490 } 3491 3492 // Initialize each field of an anonymous struct individually. 3493 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3494 HadError = true; 3495 3496 continue; 3497 } 3498 } 3499 3500 unsigned NumInitializers = Info.AllToInit.size(); 3501 if (NumInitializers > 0) { 3502 Constructor->setNumCtorInitializers(NumInitializers); 3503 CXXCtorInitializer **baseOrMemberInitializers = 3504 new (Context) CXXCtorInitializer*[NumInitializers]; 3505 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3506 NumInitializers * sizeof(CXXCtorInitializer*)); 3507 Constructor->setCtorInitializers(baseOrMemberInitializers); 3508 3509 // Constructors implicitly reference the base and member 3510 // destructors. 3511 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3512 Constructor->getParent()); 3513 } 3514 3515 return HadError; 3516} 3517 3518static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3519 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3520 const RecordDecl *RD = RT->getDecl(); 3521 if (RD->isAnonymousStructOrUnion()) { 3522 for (RecordDecl::field_iterator Field = RD->field_begin(), 3523 E = RD->field_end(); Field != E; ++Field) 3524 PopulateKeysForFields(*Field, IdealInits); 3525 return; 3526 } 3527 } 3528 IdealInits.push_back(Field); 3529} 3530 3531static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3532 return Context.getCanonicalType(BaseType).getTypePtr(); 3533} 3534 3535static const void *GetKeyForMember(ASTContext &Context, 3536 CXXCtorInitializer *Member) { 3537 if (!Member->isAnyMemberInitializer()) 3538 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3539 3540 return Member->getAnyMember(); 3541} 3542 3543static void DiagnoseBaseOrMemInitializerOrder( 3544 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3545 ArrayRef<CXXCtorInitializer *> Inits) { 3546 if (Constructor->getDeclContext()->isDependentContext()) 3547 return; 3548 3549 // Don't check initializers order unless the warning is enabled at the 3550 // location of at least one initializer. 3551 bool ShouldCheckOrder = false; 3552 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3553 CXXCtorInitializer *Init = Inits[InitIndex]; 3554 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3555 Init->getSourceLocation()) 3556 != DiagnosticsEngine::Ignored) { 3557 ShouldCheckOrder = true; 3558 break; 3559 } 3560 } 3561 if (!ShouldCheckOrder) 3562 return; 3563 3564 // Build the list of bases and members in the order that they'll 3565 // actually be initialized. The explicit initializers should be in 3566 // this same order but may be missing things. 3567 SmallVector<const void*, 32> IdealInitKeys; 3568 3569 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3570 3571 // 1. Virtual bases. 3572 for (CXXRecordDecl::base_class_const_iterator VBase = 3573 ClassDecl->vbases_begin(), 3574 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3575 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3576 3577 // 2. Non-virtual bases. 3578 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3579 E = ClassDecl->bases_end(); Base != E; ++Base) { 3580 if (Base->isVirtual()) 3581 continue; 3582 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3583 } 3584 3585 // 3. Direct fields. 3586 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3587 E = ClassDecl->field_end(); Field != E; ++Field) { 3588 if (Field->isUnnamedBitfield()) 3589 continue; 3590 3591 PopulateKeysForFields(*Field, IdealInitKeys); 3592 } 3593 3594 unsigned NumIdealInits = IdealInitKeys.size(); 3595 unsigned IdealIndex = 0; 3596 3597 CXXCtorInitializer *PrevInit = 0; 3598 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3599 CXXCtorInitializer *Init = Inits[InitIndex]; 3600 const void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3601 3602 // Scan forward to try to find this initializer in the idealized 3603 // initializers list. 3604 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3605 if (InitKey == IdealInitKeys[IdealIndex]) 3606 break; 3607 3608 // If we didn't find this initializer, it must be because we 3609 // scanned past it on a previous iteration. That can only 3610 // happen if we're out of order; emit a warning. 3611 if (IdealIndex == NumIdealInits && PrevInit) { 3612 Sema::SemaDiagnosticBuilder D = 3613 SemaRef.Diag(PrevInit->getSourceLocation(), 3614 diag::warn_initializer_out_of_order); 3615 3616 if (PrevInit->isAnyMemberInitializer()) 3617 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3618 else 3619 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3620 3621 if (Init->isAnyMemberInitializer()) 3622 D << 0 << Init->getAnyMember()->getDeclName(); 3623 else 3624 D << 1 << Init->getTypeSourceInfo()->getType(); 3625 3626 // Move back to the initializer's location in the ideal list. 3627 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3628 if (InitKey == IdealInitKeys[IdealIndex]) 3629 break; 3630 3631 assert(IdealIndex != NumIdealInits && 3632 "initializer not found in initializer list"); 3633 } 3634 3635 PrevInit = Init; 3636 } 3637} 3638 3639namespace { 3640bool CheckRedundantInit(Sema &S, 3641 CXXCtorInitializer *Init, 3642 CXXCtorInitializer *&PrevInit) { 3643 if (!PrevInit) { 3644 PrevInit = Init; 3645 return false; 3646 } 3647 3648 if (FieldDecl *Field = Init->getAnyMember()) 3649 S.Diag(Init->getSourceLocation(), 3650 diag::err_multiple_mem_initialization) 3651 << Field->getDeclName() 3652 << Init->getSourceRange(); 3653 else { 3654 const Type *BaseClass = Init->getBaseClass(); 3655 assert(BaseClass && "neither field nor base"); 3656 S.Diag(Init->getSourceLocation(), 3657 diag::err_multiple_base_initialization) 3658 << QualType(BaseClass, 0) 3659 << Init->getSourceRange(); 3660 } 3661 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3662 << 0 << PrevInit->getSourceRange(); 3663 3664 return true; 3665} 3666 3667typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3668typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3669 3670bool CheckRedundantUnionInit(Sema &S, 3671 CXXCtorInitializer *Init, 3672 RedundantUnionMap &Unions) { 3673 FieldDecl *Field = Init->getAnyMember(); 3674 RecordDecl *Parent = Field->getParent(); 3675 NamedDecl *Child = Field; 3676 3677 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3678 if (Parent->isUnion()) { 3679 UnionEntry &En = Unions[Parent]; 3680 if (En.first && En.first != Child) { 3681 S.Diag(Init->getSourceLocation(), 3682 diag::err_multiple_mem_union_initialization) 3683 << Field->getDeclName() 3684 << Init->getSourceRange(); 3685 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3686 << 0 << En.second->getSourceRange(); 3687 return true; 3688 } 3689 if (!En.first) { 3690 En.first = Child; 3691 En.second = Init; 3692 } 3693 if (!Parent->isAnonymousStructOrUnion()) 3694 return false; 3695 } 3696 3697 Child = Parent; 3698 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3699 } 3700 3701 return false; 3702} 3703} 3704 3705/// ActOnMemInitializers - Handle the member initializers for a constructor. 3706void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3707 SourceLocation ColonLoc, 3708 ArrayRef<CXXCtorInitializer*> MemInits, 3709 bool AnyErrors) { 3710 if (!ConstructorDecl) 3711 return; 3712 3713 AdjustDeclIfTemplate(ConstructorDecl); 3714 3715 CXXConstructorDecl *Constructor 3716 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3717 3718 if (!Constructor) { 3719 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3720 return; 3721 } 3722 3723 // Mapping for the duplicate initializers check. 3724 // For member initializers, this is keyed with a FieldDecl*. 3725 // For base initializers, this is keyed with a Type*. 3726 llvm::DenseMap<const void *, CXXCtorInitializer *> Members; 3727 3728 // Mapping for the inconsistent anonymous-union initializers check. 3729 RedundantUnionMap MemberUnions; 3730 3731 bool HadError = false; 3732 for (unsigned i = 0; i < MemInits.size(); i++) { 3733 CXXCtorInitializer *Init = MemInits[i]; 3734 3735 // Set the source order index. 3736 Init->setSourceOrder(i); 3737 3738 if (Init->isAnyMemberInitializer()) { 3739 FieldDecl *Field = Init->getAnyMember(); 3740 if (CheckRedundantInit(*this, Init, Members[Field]) || 3741 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3742 HadError = true; 3743 } else if (Init->isBaseInitializer()) { 3744 const void *Key = 3745 GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3746 if (CheckRedundantInit(*this, Init, Members[Key])) 3747 HadError = true; 3748 } else { 3749 assert(Init->isDelegatingInitializer()); 3750 // This must be the only initializer 3751 if (MemInits.size() != 1) { 3752 Diag(Init->getSourceLocation(), 3753 diag::err_delegating_initializer_alone) 3754 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3755 // We will treat this as being the only initializer. 3756 } 3757 SetDelegatingInitializer(Constructor, MemInits[i]); 3758 // Return immediately as the initializer is set. 3759 return; 3760 } 3761 } 3762 3763 if (HadError) 3764 return; 3765 3766 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3767 3768 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3769} 3770 3771void 3772Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3773 CXXRecordDecl *ClassDecl) { 3774 // Ignore dependent contexts. Also ignore unions, since their members never 3775 // have destructors implicitly called. 3776 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3777 return; 3778 3779 // FIXME: all the access-control diagnostics are positioned on the 3780 // field/base declaration. That's probably good; that said, the 3781 // user might reasonably want to know why the destructor is being 3782 // emitted, and we currently don't say. 3783 3784 // Non-static data members. 3785 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3786 E = ClassDecl->field_end(); I != E; ++I) { 3787 FieldDecl *Field = *I; 3788 if (Field->isInvalidDecl()) 3789 continue; 3790 3791 // Don't destroy incomplete or zero-length arrays. 3792 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3793 continue; 3794 3795 QualType FieldType = Context.getBaseElementType(Field->getType()); 3796 3797 const RecordType* RT = FieldType->getAs<RecordType>(); 3798 if (!RT) 3799 continue; 3800 3801 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3802 if (FieldClassDecl->isInvalidDecl()) 3803 continue; 3804 if (FieldClassDecl->hasIrrelevantDestructor()) 3805 continue; 3806 // The destructor for an implicit anonymous union member is never invoked. 3807 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3808 continue; 3809 3810 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3811 assert(Dtor && "No dtor found for FieldClassDecl!"); 3812 CheckDestructorAccess(Field->getLocation(), Dtor, 3813 PDiag(diag::err_access_dtor_field) 3814 << Field->getDeclName() 3815 << FieldType); 3816 3817 MarkFunctionReferenced(Location, Dtor); 3818 DiagnoseUseOfDecl(Dtor, Location); 3819 } 3820 3821 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3822 3823 // Bases. 3824 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3825 E = ClassDecl->bases_end(); Base != E; ++Base) { 3826 // Bases are always records in a well-formed non-dependent class. 3827 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3828 3829 // Remember direct virtual bases. 3830 if (Base->isVirtual()) 3831 DirectVirtualBases.insert(RT); 3832 3833 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3834 // If our base class is invalid, we probably can't get its dtor anyway. 3835 if (BaseClassDecl->isInvalidDecl()) 3836 continue; 3837 if (BaseClassDecl->hasIrrelevantDestructor()) 3838 continue; 3839 3840 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3841 assert(Dtor && "No dtor found for BaseClassDecl!"); 3842 3843 // FIXME: caret should be on the start of the class name 3844 CheckDestructorAccess(Base->getLocStart(), Dtor, 3845 PDiag(diag::err_access_dtor_base) 3846 << Base->getType() 3847 << Base->getSourceRange(), 3848 Context.getTypeDeclType(ClassDecl)); 3849 3850 MarkFunctionReferenced(Location, Dtor); 3851 DiagnoseUseOfDecl(Dtor, Location); 3852 } 3853 3854 // Virtual bases. 3855 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3856 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3857 3858 // Bases are always records in a well-formed non-dependent class. 3859 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3860 3861 // Ignore direct virtual bases. 3862 if (DirectVirtualBases.count(RT)) 3863 continue; 3864 3865 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3866 // If our base class is invalid, we probably can't get its dtor anyway. 3867 if (BaseClassDecl->isInvalidDecl()) 3868 continue; 3869 if (BaseClassDecl->hasIrrelevantDestructor()) 3870 continue; 3871 3872 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3873 assert(Dtor && "No dtor found for BaseClassDecl!"); 3874 if (CheckDestructorAccess( 3875 ClassDecl->getLocation(), Dtor, 3876 PDiag(diag::err_access_dtor_vbase) 3877 << Context.getTypeDeclType(ClassDecl) << VBase->getType(), 3878 Context.getTypeDeclType(ClassDecl)) == 3879 AR_accessible) { 3880 CheckDerivedToBaseConversion( 3881 Context.getTypeDeclType(ClassDecl), VBase->getType(), 3882 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), 3883 SourceRange(), DeclarationName(), 0); 3884 } 3885 3886 MarkFunctionReferenced(Location, Dtor); 3887 DiagnoseUseOfDecl(Dtor, Location); 3888 } 3889} 3890 3891void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3892 if (!CDtorDecl) 3893 return; 3894 3895 if (CXXConstructorDecl *Constructor 3896 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3897 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3898} 3899 3900bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3901 unsigned DiagID, AbstractDiagSelID SelID) { 3902 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3903 unsigned DiagID; 3904 AbstractDiagSelID SelID; 3905 3906 public: 3907 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3908 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3909 3910 void diagnose(Sema &S, SourceLocation Loc, QualType T) LLVM_OVERRIDE { 3911 if (Suppressed) return; 3912 if (SelID == -1) 3913 S.Diag(Loc, DiagID) << T; 3914 else 3915 S.Diag(Loc, DiagID) << SelID << T; 3916 } 3917 } Diagnoser(DiagID, SelID); 3918 3919 return RequireNonAbstractType(Loc, T, Diagnoser); 3920} 3921 3922bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3923 TypeDiagnoser &Diagnoser) { 3924 if (!getLangOpts().CPlusPlus) 3925 return false; 3926 3927 if (const ArrayType *AT = Context.getAsArrayType(T)) 3928 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3929 3930 if (const PointerType *PT = T->getAs<PointerType>()) { 3931 // Find the innermost pointer type. 3932 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3933 PT = T; 3934 3935 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3936 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3937 } 3938 3939 const RecordType *RT = T->getAs<RecordType>(); 3940 if (!RT) 3941 return false; 3942 3943 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3944 3945 // We can't answer whether something is abstract until it has a 3946 // definition. If it's currently being defined, we'll walk back 3947 // over all the declarations when we have a full definition. 3948 const CXXRecordDecl *Def = RD->getDefinition(); 3949 if (!Def || Def->isBeingDefined()) 3950 return false; 3951 3952 if (!RD->isAbstract()) 3953 return false; 3954 3955 Diagnoser.diagnose(*this, Loc, T); 3956 DiagnoseAbstractType(RD); 3957 3958 return true; 3959} 3960 3961void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3962 // Check if we've already emitted the list of pure virtual functions 3963 // for this class. 3964 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3965 return; 3966 3967 // If the diagnostic is suppressed, don't emit the notes. We're only 3968 // going to emit them once, so try to attach them to a diagnostic we're 3969 // actually going to show. 3970 if (Diags.isLastDiagnosticIgnored()) 3971 return; 3972 3973 CXXFinalOverriderMap FinalOverriders; 3974 RD->getFinalOverriders(FinalOverriders); 3975 3976 // Keep a set of seen pure methods so we won't diagnose the same method 3977 // more than once. 3978 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3979 3980 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3981 MEnd = FinalOverriders.end(); 3982 M != MEnd; 3983 ++M) { 3984 for (OverridingMethods::iterator SO = M->second.begin(), 3985 SOEnd = M->second.end(); 3986 SO != SOEnd; ++SO) { 3987 // C++ [class.abstract]p4: 3988 // A class is abstract if it contains or inherits at least one 3989 // pure virtual function for which the final overrider is pure 3990 // virtual. 3991 3992 // 3993 if (SO->second.size() != 1) 3994 continue; 3995 3996 if (!SO->second.front().Method->isPure()) 3997 continue; 3998 3999 if (!SeenPureMethods.insert(SO->second.front().Method)) 4000 continue; 4001 4002 Diag(SO->second.front().Method->getLocation(), 4003 diag::note_pure_virtual_function) 4004 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 4005 } 4006 } 4007 4008 if (!PureVirtualClassDiagSet) 4009 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 4010 PureVirtualClassDiagSet->insert(RD); 4011} 4012 4013namespace { 4014struct AbstractUsageInfo { 4015 Sema &S; 4016 CXXRecordDecl *Record; 4017 CanQualType AbstractType; 4018 bool Invalid; 4019 4020 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 4021 : S(S), Record(Record), 4022 AbstractType(S.Context.getCanonicalType( 4023 S.Context.getTypeDeclType(Record))), 4024 Invalid(false) {} 4025 4026 void DiagnoseAbstractType() { 4027 if (Invalid) return; 4028 S.DiagnoseAbstractType(Record); 4029 Invalid = true; 4030 } 4031 4032 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 4033}; 4034 4035struct CheckAbstractUsage { 4036 AbstractUsageInfo &Info; 4037 const NamedDecl *Ctx; 4038 4039 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 4040 : Info(Info), Ctx(Ctx) {} 4041 4042 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4043 switch (TL.getTypeLocClass()) { 4044#define ABSTRACT_TYPELOC(CLASS, PARENT) 4045#define TYPELOC(CLASS, PARENT) \ 4046 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 4047#include "clang/AST/TypeLocNodes.def" 4048 } 4049 } 4050 4051 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4052 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 4053 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4054 if (!TL.getArg(I)) 4055 continue; 4056 4057 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 4058 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 4059 } 4060 } 4061 4062 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4063 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 4064 } 4065 4066 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4067 // Visit the type parameters from a permissive context. 4068 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4069 TemplateArgumentLoc TAL = TL.getArgLoc(I); 4070 if (TAL.getArgument().getKind() == TemplateArgument::Type) 4071 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 4072 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 4073 // TODO: other template argument types? 4074 } 4075 } 4076 4077 // Visit pointee types from a permissive context. 4078#define CheckPolymorphic(Type) \ 4079 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 4080 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 4081 } 4082 CheckPolymorphic(PointerTypeLoc) 4083 CheckPolymorphic(ReferenceTypeLoc) 4084 CheckPolymorphic(MemberPointerTypeLoc) 4085 CheckPolymorphic(BlockPointerTypeLoc) 4086 CheckPolymorphic(AtomicTypeLoc) 4087 4088 /// Handle all the types we haven't given a more specific 4089 /// implementation for above. 4090 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4091 // Every other kind of type that we haven't called out already 4092 // that has an inner type is either (1) sugar or (2) contains that 4093 // inner type in some way as a subobject. 4094 if (TypeLoc Next = TL.getNextTypeLoc()) 4095 return Visit(Next, Sel); 4096 4097 // If there's no inner type and we're in a permissive context, 4098 // don't diagnose. 4099 if (Sel == Sema::AbstractNone) return; 4100 4101 // Check whether the type matches the abstract type. 4102 QualType T = TL.getType(); 4103 if (T->isArrayType()) { 4104 Sel = Sema::AbstractArrayType; 4105 T = Info.S.Context.getBaseElementType(T); 4106 } 4107 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4108 if (CT != Info.AbstractType) return; 4109 4110 // It matched; do some magic. 4111 if (Sel == Sema::AbstractArrayType) { 4112 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4113 << T << TL.getSourceRange(); 4114 } else { 4115 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4116 << Sel << T << TL.getSourceRange(); 4117 } 4118 Info.DiagnoseAbstractType(); 4119 } 4120}; 4121 4122void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4123 Sema::AbstractDiagSelID Sel) { 4124 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4125} 4126 4127} 4128 4129/// Check for invalid uses of an abstract type in a method declaration. 4130static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4131 CXXMethodDecl *MD) { 4132 // No need to do the check on definitions, which require that 4133 // the return/param types be complete. 4134 if (MD->doesThisDeclarationHaveABody()) 4135 return; 4136 4137 // For safety's sake, just ignore it if we don't have type source 4138 // information. This should never happen for non-implicit methods, 4139 // but... 4140 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4141 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4142} 4143 4144/// Check for invalid uses of an abstract type within a class definition. 4145static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4146 CXXRecordDecl *RD) { 4147 for (CXXRecordDecl::decl_iterator 4148 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4149 Decl *D = *I; 4150 if (D->isImplicit()) continue; 4151 4152 // Methods and method templates. 4153 if (isa<CXXMethodDecl>(D)) { 4154 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4155 } else if (isa<FunctionTemplateDecl>(D)) { 4156 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4157 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4158 4159 // Fields and static variables. 4160 } else if (isa<FieldDecl>(D)) { 4161 FieldDecl *FD = cast<FieldDecl>(D); 4162 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4163 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4164 } else if (isa<VarDecl>(D)) { 4165 VarDecl *VD = cast<VarDecl>(D); 4166 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4167 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4168 4169 // Nested classes and class templates. 4170 } else if (isa<CXXRecordDecl>(D)) { 4171 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4172 } else if (isa<ClassTemplateDecl>(D)) { 4173 CheckAbstractClassUsage(Info, 4174 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4175 } 4176 } 4177} 4178 4179/// \brief Perform semantic checks on a class definition that has been 4180/// completing, introducing implicitly-declared members, checking for 4181/// abstract types, etc. 4182void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4183 if (!Record) 4184 return; 4185 4186 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4187 AbstractUsageInfo Info(*this, Record); 4188 CheckAbstractClassUsage(Info, Record); 4189 } 4190 4191 // If this is not an aggregate type and has no user-declared constructor, 4192 // complain about any non-static data members of reference or const scalar 4193 // type, since they will never get initializers. 4194 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4195 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4196 !Record->isLambda()) { 4197 bool Complained = false; 4198 for (RecordDecl::field_iterator F = Record->field_begin(), 4199 FEnd = Record->field_end(); 4200 F != FEnd; ++F) { 4201 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4202 continue; 4203 4204 if (F->getType()->isReferenceType() || 4205 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4206 if (!Complained) { 4207 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4208 << Record->getTagKind() << Record; 4209 Complained = true; 4210 } 4211 4212 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4213 << F->getType()->isReferenceType() 4214 << F->getDeclName(); 4215 } 4216 } 4217 } 4218 4219 if (Record->isDynamicClass() && !Record->isDependentType()) 4220 DynamicClasses.push_back(Record); 4221 4222 if (Record->getIdentifier()) { 4223 // C++ [class.mem]p13: 4224 // If T is the name of a class, then each of the following shall have a 4225 // name different from T: 4226 // - every member of every anonymous union that is a member of class T. 4227 // 4228 // C++ [class.mem]p14: 4229 // In addition, if class T has a user-declared constructor (12.1), every 4230 // non-static data member of class T shall have a name different from T. 4231 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4232 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4233 ++I) { 4234 NamedDecl *D = *I; 4235 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4236 isa<IndirectFieldDecl>(D)) { 4237 Diag(D->getLocation(), diag::err_member_name_of_class) 4238 << D->getDeclName(); 4239 break; 4240 } 4241 } 4242 } 4243 4244 // Warn if the class has virtual methods but non-virtual public destructor. 4245 if (Record->isPolymorphic() && !Record->isDependentType()) { 4246 CXXDestructorDecl *dtor = Record->getDestructor(); 4247 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4248 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4249 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4250 } 4251 4252 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4253 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4254 DiagnoseAbstractType(Record); 4255 } 4256 4257 if (!Record->isDependentType()) { 4258 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4259 MEnd = Record->method_end(); 4260 M != MEnd; ++M) { 4261 // See if a method overloads virtual methods in a base 4262 // class without overriding any. 4263 if (!M->isStatic()) 4264 DiagnoseHiddenVirtualMethods(*M); 4265 4266 // Check whether the explicitly-defaulted special members are valid. 4267 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4268 CheckExplicitlyDefaultedSpecialMember(*M); 4269 4270 // For an explicitly defaulted or deleted special member, we defer 4271 // determining triviality until the class is complete. That time is now! 4272 if (!M->isImplicit() && !M->isUserProvided()) { 4273 CXXSpecialMember CSM = getSpecialMember(*M); 4274 if (CSM != CXXInvalid) { 4275 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4276 4277 // Inform the class that we've finished declaring this member. 4278 Record->finishedDefaultedOrDeletedMember(*M); 4279 } 4280 } 4281 } 4282 } 4283 4284 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4285 // function that is not a constructor declares that member function to be 4286 // const. [...] The class of which that function is a member shall be 4287 // a literal type. 4288 // 4289 // If the class has virtual bases, any constexpr members will already have 4290 // been diagnosed by the checks performed on the member declaration, so 4291 // suppress this (less useful) diagnostic. 4292 // 4293 // We delay this until we know whether an explicitly-defaulted (or deleted) 4294 // destructor for the class is trivial. 4295 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4296 !Record->isLiteral() && !Record->getNumVBases()) { 4297 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4298 MEnd = Record->method_end(); 4299 M != MEnd; ++M) { 4300 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4301 switch (Record->getTemplateSpecializationKind()) { 4302 case TSK_ImplicitInstantiation: 4303 case TSK_ExplicitInstantiationDeclaration: 4304 case TSK_ExplicitInstantiationDefinition: 4305 // If a template instantiates to a non-literal type, but its members 4306 // instantiate to constexpr functions, the template is technically 4307 // ill-formed, but we allow it for sanity. 4308 continue; 4309 4310 case TSK_Undeclared: 4311 case TSK_ExplicitSpecialization: 4312 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4313 diag::err_constexpr_method_non_literal); 4314 break; 4315 } 4316 4317 // Only produce one error per class. 4318 break; 4319 } 4320 } 4321 } 4322 4323 // Declare inheriting constructors. We do this eagerly here because: 4324 // - The standard requires an eager diagnostic for conflicting inheriting 4325 // constructors from different classes. 4326 // - The lazy declaration of the other implicit constructors is so as to not 4327 // waste space and performance on classes that are not meant to be 4328 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4329 // have inheriting constructors. 4330 DeclareInheritingConstructors(Record); 4331} 4332 4333/// Is the special member function which would be selected to perform the 4334/// specified operation on the specified class type a constexpr constructor? 4335static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4336 Sema::CXXSpecialMember CSM, 4337 bool ConstArg) { 4338 Sema::SpecialMemberOverloadResult *SMOR = 4339 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4340 false, false, false, false); 4341 if (!SMOR || !SMOR->getMethod()) 4342 // A constructor we wouldn't select can't be "involved in initializing" 4343 // anything. 4344 return true; 4345 return SMOR->getMethod()->isConstexpr(); 4346} 4347 4348/// Determine whether the specified special member function would be constexpr 4349/// if it were implicitly defined. 4350static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4351 Sema::CXXSpecialMember CSM, 4352 bool ConstArg) { 4353 if (!S.getLangOpts().CPlusPlus11) 4354 return false; 4355 4356 // C++11 [dcl.constexpr]p4: 4357 // In the definition of a constexpr constructor [...] 4358 bool Ctor = true; 4359 switch (CSM) { 4360 case Sema::CXXDefaultConstructor: 4361 // Since default constructor lookup is essentially trivial (and cannot 4362 // involve, for instance, template instantiation), we compute whether a 4363 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4364 // 4365 // This is important for performance; we need to know whether the default 4366 // constructor is constexpr to determine whether the type is a literal type. 4367 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4368 4369 case Sema::CXXCopyConstructor: 4370 case Sema::CXXMoveConstructor: 4371 // For copy or move constructors, we need to perform overload resolution. 4372 break; 4373 4374 case Sema::CXXCopyAssignment: 4375 case Sema::CXXMoveAssignment: 4376 if (!S.getLangOpts().CPlusPlus1y) 4377 return false; 4378 // In C++1y, we need to perform overload resolution. 4379 Ctor = false; 4380 break; 4381 4382 case Sema::CXXDestructor: 4383 case Sema::CXXInvalid: 4384 return false; 4385 } 4386 4387 // -- if the class is a non-empty union, or for each non-empty anonymous 4388 // union member of a non-union class, exactly one non-static data member 4389 // shall be initialized; [DR1359] 4390 // 4391 // If we squint, this is guaranteed, since exactly one non-static data member 4392 // will be initialized (if the constructor isn't deleted), we just don't know 4393 // which one. 4394 if (Ctor && ClassDecl->isUnion()) 4395 return true; 4396 4397 // -- the class shall not have any virtual base classes; 4398 if (Ctor && ClassDecl->getNumVBases()) 4399 return false; 4400 4401 // C++1y [class.copy]p26: 4402 // -- [the class] is a literal type, and 4403 if (!Ctor && !ClassDecl->isLiteral()) 4404 return false; 4405 4406 // -- every constructor involved in initializing [...] base class 4407 // sub-objects shall be a constexpr constructor; 4408 // -- the assignment operator selected to copy/move each direct base 4409 // class is a constexpr function, and 4410 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4411 BEnd = ClassDecl->bases_end(); 4412 B != BEnd; ++B) { 4413 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4414 if (!BaseType) continue; 4415 4416 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4417 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4418 return false; 4419 } 4420 4421 // -- every constructor involved in initializing non-static data members 4422 // [...] shall be a constexpr constructor; 4423 // -- every non-static data member and base class sub-object shall be 4424 // initialized 4425 // -- for each non-stastic data member of X that is of class type (or array 4426 // thereof), the assignment operator selected to copy/move that member is 4427 // a constexpr function 4428 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4429 FEnd = ClassDecl->field_end(); 4430 F != FEnd; ++F) { 4431 if (F->isInvalidDecl()) 4432 continue; 4433 if (const RecordType *RecordTy = 4434 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4435 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4436 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4437 return false; 4438 } 4439 } 4440 4441 // All OK, it's constexpr! 4442 return true; 4443} 4444 4445static Sema::ImplicitExceptionSpecification 4446computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4447 switch (S.getSpecialMember(MD)) { 4448 case Sema::CXXDefaultConstructor: 4449 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4450 case Sema::CXXCopyConstructor: 4451 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4452 case Sema::CXXCopyAssignment: 4453 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4454 case Sema::CXXMoveConstructor: 4455 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4456 case Sema::CXXMoveAssignment: 4457 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4458 case Sema::CXXDestructor: 4459 return S.ComputeDefaultedDtorExceptionSpec(MD); 4460 case Sema::CXXInvalid: 4461 break; 4462 } 4463 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4464 "only special members have implicit exception specs"); 4465 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4466} 4467 4468static void 4469updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4470 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4471 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4472 ExceptSpec.getEPI(EPI); 4473 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4474 FPT->getArgTypes(), EPI)); 4475} 4476 4477static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, 4478 CXXMethodDecl *MD) { 4479 FunctionProtoType::ExtProtoInfo EPI; 4480 4481 // Build an exception specification pointing back at this member. 4482 EPI.ExceptionSpecType = EST_Unevaluated; 4483 EPI.ExceptionSpecDecl = MD; 4484 4485 // Set the calling convention to the default for C++ instance methods. 4486 EPI.ExtInfo = EPI.ExtInfo.withCallingConv( 4487 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4488 /*IsCXXMethod=*/true)); 4489 return EPI; 4490} 4491 4492void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4493 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4494 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4495 return; 4496 4497 // Evaluate the exception specification. 4498 ImplicitExceptionSpecification ExceptSpec = 4499 computeImplicitExceptionSpec(*this, Loc, MD); 4500 4501 // Update the type of the special member to use it. 4502 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4503 4504 // A user-provided destructor can be defined outside the class. When that 4505 // happens, be sure to update the exception specification on both 4506 // declarations. 4507 const FunctionProtoType *CanonicalFPT = 4508 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4509 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4510 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4511 CanonicalFPT, ExceptSpec); 4512} 4513 4514void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4515 CXXRecordDecl *RD = MD->getParent(); 4516 CXXSpecialMember CSM = getSpecialMember(MD); 4517 4518 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4519 "not an explicitly-defaulted special member"); 4520 4521 // Whether this was the first-declared instance of the constructor. 4522 // This affects whether we implicitly add an exception spec and constexpr. 4523 bool First = MD == MD->getCanonicalDecl(); 4524 4525 bool HadError = false; 4526 4527 // C++11 [dcl.fct.def.default]p1: 4528 // A function that is explicitly defaulted shall 4529 // -- be a special member function (checked elsewhere), 4530 // -- have the same type (except for ref-qualifiers, and except that a 4531 // copy operation can take a non-const reference) as an implicit 4532 // declaration, and 4533 // -- not have default arguments. 4534 unsigned ExpectedParams = 1; 4535 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4536 ExpectedParams = 0; 4537 if (MD->getNumParams() != ExpectedParams) { 4538 // This also checks for default arguments: a copy or move constructor with a 4539 // default argument is classified as a default constructor, and assignment 4540 // operations and destructors can't have default arguments. 4541 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4542 << CSM << MD->getSourceRange(); 4543 HadError = true; 4544 } else if (MD->isVariadic()) { 4545 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4546 << CSM << MD->getSourceRange(); 4547 HadError = true; 4548 } 4549 4550 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4551 4552 bool CanHaveConstParam = false; 4553 if (CSM == CXXCopyConstructor) 4554 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4555 else if (CSM == CXXCopyAssignment) 4556 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4557 4558 QualType ReturnType = Context.VoidTy; 4559 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4560 // Check for return type matching. 4561 ReturnType = Type->getResultType(); 4562 QualType ExpectedReturnType = 4563 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4564 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4565 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4566 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4567 HadError = true; 4568 } 4569 4570 // A defaulted special member cannot have cv-qualifiers. 4571 if (Type->getTypeQuals()) { 4572 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4573 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4574 HadError = true; 4575 } 4576 } 4577 4578 // Check for parameter type matching. 4579 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4580 bool HasConstParam = false; 4581 if (ExpectedParams && ArgType->isReferenceType()) { 4582 // Argument must be reference to possibly-const T. 4583 QualType ReferentType = ArgType->getPointeeType(); 4584 HasConstParam = ReferentType.isConstQualified(); 4585 4586 if (ReferentType.isVolatileQualified()) { 4587 Diag(MD->getLocation(), 4588 diag::err_defaulted_special_member_volatile_param) << CSM; 4589 HadError = true; 4590 } 4591 4592 if (HasConstParam && !CanHaveConstParam) { 4593 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4594 Diag(MD->getLocation(), 4595 diag::err_defaulted_special_member_copy_const_param) 4596 << (CSM == CXXCopyAssignment); 4597 // FIXME: Explain why this special member can't be const. 4598 } else { 4599 Diag(MD->getLocation(), 4600 diag::err_defaulted_special_member_move_const_param) 4601 << (CSM == CXXMoveAssignment); 4602 } 4603 HadError = true; 4604 } 4605 } else if (ExpectedParams) { 4606 // A copy assignment operator can take its argument by value, but a 4607 // defaulted one cannot. 4608 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4609 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4610 HadError = true; 4611 } 4612 4613 // C++11 [dcl.fct.def.default]p2: 4614 // An explicitly-defaulted function may be declared constexpr only if it 4615 // would have been implicitly declared as constexpr, 4616 // Do not apply this rule to members of class templates, since core issue 1358 4617 // makes such functions always instantiate to constexpr functions. For 4618 // functions which cannot be constexpr (for non-constructors in C++11 and for 4619 // destructors in C++1y), this is checked elsewhere. 4620 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4621 HasConstParam); 4622 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4623 : isa<CXXConstructorDecl>(MD)) && 4624 MD->isConstexpr() && !Constexpr && 4625 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4626 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4627 // FIXME: Explain why the special member can't be constexpr. 4628 HadError = true; 4629 } 4630 4631 // and may have an explicit exception-specification only if it is compatible 4632 // with the exception-specification on the implicit declaration. 4633 if (Type->hasExceptionSpec()) { 4634 // Delay the check if this is the first declaration of the special member, 4635 // since we may not have parsed some necessary in-class initializers yet. 4636 if (First) { 4637 // If the exception specification needs to be instantiated, do so now, 4638 // before we clobber it with an EST_Unevaluated specification below. 4639 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4640 InstantiateExceptionSpec(MD->getLocStart(), MD); 4641 Type = MD->getType()->getAs<FunctionProtoType>(); 4642 } 4643 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4644 } else 4645 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4646 } 4647 4648 // If a function is explicitly defaulted on its first declaration, 4649 if (First) { 4650 // -- it is implicitly considered to be constexpr if the implicit 4651 // definition would be, 4652 MD->setConstexpr(Constexpr); 4653 4654 // -- it is implicitly considered to have the same exception-specification 4655 // as if it had been implicitly declared, 4656 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4657 EPI.ExceptionSpecType = EST_Unevaluated; 4658 EPI.ExceptionSpecDecl = MD; 4659 MD->setType(Context.getFunctionType(ReturnType, 4660 ArrayRef<QualType>(&ArgType, 4661 ExpectedParams), 4662 EPI)); 4663 } 4664 4665 if (ShouldDeleteSpecialMember(MD, CSM)) { 4666 if (First) { 4667 SetDeclDeleted(MD, MD->getLocation()); 4668 } else { 4669 // C++11 [dcl.fct.def.default]p4: 4670 // [For a] user-provided explicitly-defaulted function [...] if such a 4671 // function is implicitly defined as deleted, the program is ill-formed. 4672 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4673 HadError = true; 4674 } 4675 } 4676 4677 if (HadError) 4678 MD->setInvalidDecl(); 4679} 4680 4681/// Check whether the exception specification provided for an 4682/// explicitly-defaulted special member matches the exception specification 4683/// that would have been generated for an implicit special member, per 4684/// C++11 [dcl.fct.def.default]p2. 4685void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4686 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4687 // Compute the implicit exception specification. 4688 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4689 /*IsCXXMethod=*/true); 4690 FunctionProtoType::ExtProtoInfo EPI(CC); 4691 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4692 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4693 Context.getFunctionType(Context.VoidTy, None, EPI)); 4694 4695 // Ensure that it matches. 4696 CheckEquivalentExceptionSpec( 4697 PDiag(diag::err_incorrect_defaulted_exception_spec) 4698 << getSpecialMember(MD), PDiag(), 4699 ImplicitType, SourceLocation(), 4700 SpecifiedType, MD->getLocation()); 4701} 4702 4703void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4704 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4705 I != N; ++I) 4706 CheckExplicitlyDefaultedMemberExceptionSpec( 4707 DelayedDefaultedMemberExceptionSpecs[I].first, 4708 DelayedDefaultedMemberExceptionSpecs[I].second); 4709 4710 DelayedDefaultedMemberExceptionSpecs.clear(); 4711} 4712 4713namespace { 4714struct SpecialMemberDeletionInfo { 4715 Sema &S; 4716 CXXMethodDecl *MD; 4717 Sema::CXXSpecialMember CSM; 4718 bool Diagnose; 4719 4720 // Properties of the special member, computed for convenience. 4721 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4722 SourceLocation Loc; 4723 4724 bool AllFieldsAreConst; 4725 4726 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4727 Sema::CXXSpecialMember CSM, bool Diagnose) 4728 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4729 IsConstructor(false), IsAssignment(false), IsMove(false), 4730 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4731 AllFieldsAreConst(true) { 4732 switch (CSM) { 4733 case Sema::CXXDefaultConstructor: 4734 case Sema::CXXCopyConstructor: 4735 IsConstructor = true; 4736 break; 4737 case Sema::CXXMoveConstructor: 4738 IsConstructor = true; 4739 IsMove = true; 4740 break; 4741 case Sema::CXXCopyAssignment: 4742 IsAssignment = true; 4743 break; 4744 case Sema::CXXMoveAssignment: 4745 IsAssignment = true; 4746 IsMove = true; 4747 break; 4748 case Sema::CXXDestructor: 4749 break; 4750 case Sema::CXXInvalid: 4751 llvm_unreachable("invalid special member kind"); 4752 } 4753 4754 if (MD->getNumParams()) { 4755 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4756 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4757 } 4758 } 4759 4760 bool inUnion() const { return MD->getParent()->isUnion(); } 4761 4762 /// Look up the corresponding special member in the given class. 4763 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4764 unsigned Quals) { 4765 unsigned TQ = MD->getTypeQualifiers(); 4766 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4767 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4768 Quals = 0; 4769 return S.LookupSpecialMember(Class, CSM, 4770 ConstArg || (Quals & Qualifiers::Const), 4771 VolatileArg || (Quals & Qualifiers::Volatile), 4772 MD->getRefQualifier() == RQ_RValue, 4773 TQ & Qualifiers::Const, 4774 TQ & Qualifiers::Volatile); 4775 } 4776 4777 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4778 4779 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4780 bool shouldDeleteForField(FieldDecl *FD); 4781 bool shouldDeleteForAllConstMembers(); 4782 4783 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4784 unsigned Quals); 4785 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4786 Sema::SpecialMemberOverloadResult *SMOR, 4787 bool IsDtorCallInCtor); 4788 4789 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4790}; 4791} 4792 4793/// Is the given special member inaccessible when used on the given 4794/// sub-object. 4795bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4796 CXXMethodDecl *target) { 4797 /// If we're operating on a base class, the object type is the 4798 /// type of this special member. 4799 QualType objectTy; 4800 AccessSpecifier access = target->getAccess(); 4801 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4802 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4803 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4804 4805 // If we're operating on a field, the object type is the type of the field. 4806 } else { 4807 objectTy = S.Context.getTypeDeclType(target->getParent()); 4808 } 4809 4810 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4811} 4812 4813/// Check whether we should delete a special member due to the implicit 4814/// definition containing a call to a special member of a subobject. 4815bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4816 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4817 bool IsDtorCallInCtor) { 4818 CXXMethodDecl *Decl = SMOR->getMethod(); 4819 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4820 4821 int DiagKind = -1; 4822 4823 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4824 DiagKind = !Decl ? 0 : 1; 4825 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4826 DiagKind = 2; 4827 else if (!isAccessible(Subobj, Decl)) 4828 DiagKind = 3; 4829 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4830 !Decl->isTrivial()) { 4831 // A member of a union must have a trivial corresponding special member. 4832 // As a weird special case, a destructor call from a union's constructor 4833 // must be accessible and non-deleted, but need not be trivial. Such a 4834 // destructor is never actually called, but is semantically checked as 4835 // if it were. 4836 DiagKind = 4; 4837 } 4838 4839 if (DiagKind == -1) 4840 return false; 4841 4842 if (Diagnose) { 4843 if (Field) { 4844 S.Diag(Field->getLocation(), 4845 diag::note_deleted_special_member_class_subobject) 4846 << CSM << MD->getParent() << /*IsField*/true 4847 << Field << DiagKind << IsDtorCallInCtor; 4848 } else { 4849 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4850 S.Diag(Base->getLocStart(), 4851 diag::note_deleted_special_member_class_subobject) 4852 << CSM << MD->getParent() << /*IsField*/false 4853 << Base->getType() << DiagKind << IsDtorCallInCtor; 4854 } 4855 4856 if (DiagKind == 1) 4857 S.NoteDeletedFunction(Decl); 4858 // FIXME: Explain inaccessibility if DiagKind == 3. 4859 } 4860 4861 return true; 4862} 4863 4864/// Check whether we should delete a special member function due to having a 4865/// direct or virtual base class or non-static data member of class type M. 4866bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4867 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4868 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4869 4870 // C++11 [class.ctor]p5: 4871 // -- any direct or virtual base class, or non-static data member with no 4872 // brace-or-equal-initializer, has class type M (or array thereof) and 4873 // either M has no default constructor or overload resolution as applied 4874 // to M's default constructor results in an ambiguity or in a function 4875 // that is deleted or inaccessible 4876 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4877 // -- a direct or virtual base class B that cannot be copied/moved because 4878 // overload resolution, as applied to B's corresponding special member, 4879 // results in an ambiguity or a function that is deleted or inaccessible 4880 // from the defaulted special member 4881 // C++11 [class.dtor]p5: 4882 // -- any direct or virtual base class [...] has a type with a destructor 4883 // that is deleted or inaccessible 4884 if (!(CSM == Sema::CXXDefaultConstructor && 4885 Field && Field->hasInClassInitializer()) && 4886 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4887 return true; 4888 4889 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4890 // -- any direct or virtual base class or non-static data member has a 4891 // type with a destructor that is deleted or inaccessible 4892 if (IsConstructor) { 4893 Sema::SpecialMemberOverloadResult *SMOR = 4894 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4895 false, false, false, false, false); 4896 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4897 return true; 4898 } 4899 4900 return false; 4901} 4902 4903/// Check whether we should delete a special member function due to the class 4904/// having a particular direct or virtual base class. 4905bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4906 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4907 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4908} 4909 4910/// Check whether we should delete a special member function due to the class 4911/// having a particular non-static data member. 4912bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4913 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4914 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4915 4916 if (CSM == Sema::CXXDefaultConstructor) { 4917 // For a default constructor, all references must be initialized in-class 4918 // and, if a union, it must have a non-const member. 4919 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4920 if (Diagnose) 4921 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4922 << MD->getParent() << FD << FieldType << /*Reference*/0; 4923 return true; 4924 } 4925 // C++11 [class.ctor]p5: any non-variant non-static data member of 4926 // const-qualified type (or array thereof) with no 4927 // brace-or-equal-initializer does not have a user-provided default 4928 // constructor. 4929 if (!inUnion() && FieldType.isConstQualified() && 4930 !FD->hasInClassInitializer() && 4931 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4932 if (Diagnose) 4933 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4934 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4935 return true; 4936 } 4937 4938 if (inUnion() && !FieldType.isConstQualified()) 4939 AllFieldsAreConst = false; 4940 } else if (CSM == Sema::CXXCopyConstructor) { 4941 // For a copy constructor, data members must not be of rvalue reference 4942 // type. 4943 if (FieldType->isRValueReferenceType()) { 4944 if (Diagnose) 4945 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4946 << MD->getParent() << FD << FieldType; 4947 return true; 4948 } 4949 } else if (IsAssignment) { 4950 // For an assignment operator, data members must not be of reference type. 4951 if (FieldType->isReferenceType()) { 4952 if (Diagnose) 4953 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4954 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4955 return true; 4956 } 4957 if (!FieldRecord && FieldType.isConstQualified()) { 4958 // C++11 [class.copy]p23: 4959 // -- a non-static data member of const non-class type (or array thereof) 4960 if (Diagnose) 4961 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4962 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4963 return true; 4964 } 4965 } 4966 4967 if (FieldRecord) { 4968 // Some additional restrictions exist on the variant members. 4969 if (!inUnion() && FieldRecord->isUnion() && 4970 FieldRecord->isAnonymousStructOrUnion()) { 4971 bool AllVariantFieldsAreConst = true; 4972 4973 // FIXME: Handle anonymous unions declared within anonymous unions. 4974 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4975 UE = FieldRecord->field_end(); 4976 UI != UE; ++UI) { 4977 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4978 4979 if (!UnionFieldType.isConstQualified()) 4980 AllVariantFieldsAreConst = false; 4981 4982 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4983 if (UnionFieldRecord && 4984 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4985 UnionFieldType.getCVRQualifiers())) 4986 return true; 4987 } 4988 4989 // At least one member in each anonymous union must be non-const 4990 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4991 FieldRecord->field_begin() != FieldRecord->field_end()) { 4992 if (Diagnose) 4993 S.Diag(FieldRecord->getLocation(), 4994 diag::note_deleted_default_ctor_all_const) 4995 << MD->getParent() << /*anonymous union*/1; 4996 return true; 4997 } 4998 4999 // Don't check the implicit member of the anonymous union type. 5000 // This is technically non-conformant, but sanity demands it. 5001 return false; 5002 } 5003 5004 if (shouldDeleteForClassSubobject(FieldRecord, FD, 5005 FieldType.getCVRQualifiers())) 5006 return true; 5007 } 5008 5009 return false; 5010} 5011 5012/// C++11 [class.ctor] p5: 5013/// A defaulted default constructor for a class X is defined as deleted if 5014/// X is a union and all of its variant members are of const-qualified type. 5015bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 5016 // This is a silly definition, because it gives an empty union a deleted 5017 // default constructor. Don't do that. 5018 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 5019 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 5020 if (Diagnose) 5021 S.Diag(MD->getParent()->getLocation(), 5022 diag::note_deleted_default_ctor_all_const) 5023 << MD->getParent() << /*not anonymous union*/0; 5024 return true; 5025 } 5026 return false; 5027} 5028 5029/// Determine whether a defaulted special member function should be defined as 5030/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 5031/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 5032bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 5033 bool Diagnose) { 5034 if (MD->isInvalidDecl()) 5035 return false; 5036 CXXRecordDecl *RD = MD->getParent(); 5037 assert(!RD->isDependentType() && "do deletion after instantiation"); 5038 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 5039 return false; 5040 5041 // C++11 [expr.lambda.prim]p19: 5042 // The closure type associated with a lambda-expression has a 5043 // deleted (8.4.3) default constructor and a deleted copy 5044 // assignment operator. 5045 if (RD->isLambda() && 5046 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 5047 if (Diagnose) 5048 Diag(RD->getLocation(), diag::note_lambda_decl); 5049 return true; 5050 } 5051 5052 // For an anonymous struct or union, the copy and assignment special members 5053 // will never be used, so skip the check. For an anonymous union declared at 5054 // namespace scope, the constructor and destructor are used. 5055 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 5056 RD->isAnonymousStructOrUnion()) 5057 return false; 5058 5059 // C++11 [class.copy]p7, p18: 5060 // If the class definition declares a move constructor or move assignment 5061 // operator, an implicitly declared copy constructor or copy assignment 5062 // operator is defined as deleted. 5063 if (MD->isImplicit() && 5064 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 5065 CXXMethodDecl *UserDeclaredMove = 0; 5066 5067 // In Microsoft mode, a user-declared move only causes the deletion of the 5068 // corresponding copy operation, not both copy operations. 5069 if (RD->hasUserDeclaredMoveConstructor() && 5070 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 5071 if (!Diagnose) return true; 5072 5073 // Find any user-declared move constructor. 5074 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 5075 E = RD->ctor_end(); I != E; ++I) { 5076 if (I->isMoveConstructor()) { 5077 UserDeclaredMove = *I; 5078 break; 5079 } 5080 } 5081 assert(UserDeclaredMove); 5082 } else if (RD->hasUserDeclaredMoveAssignment() && 5083 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 5084 if (!Diagnose) return true; 5085 5086 // Find any user-declared move assignment operator. 5087 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 5088 E = RD->method_end(); I != E; ++I) { 5089 if (I->isMoveAssignmentOperator()) { 5090 UserDeclaredMove = *I; 5091 break; 5092 } 5093 } 5094 assert(UserDeclaredMove); 5095 } 5096 5097 if (UserDeclaredMove) { 5098 Diag(UserDeclaredMove->getLocation(), 5099 diag::note_deleted_copy_user_declared_move) 5100 << (CSM == CXXCopyAssignment) << RD 5101 << UserDeclaredMove->isMoveAssignmentOperator(); 5102 return true; 5103 } 5104 } 5105 5106 // Do access control from the special member function 5107 ContextRAII MethodContext(*this, MD); 5108 5109 // C++11 [class.dtor]p5: 5110 // -- for a virtual destructor, lookup of the non-array deallocation function 5111 // results in an ambiguity or in a function that is deleted or inaccessible 5112 if (CSM == CXXDestructor && MD->isVirtual()) { 5113 FunctionDecl *OperatorDelete = 0; 5114 DeclarationName Name = 5115 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5116 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5117 OperatorDelete, false)) { 5118 if (Diagnose) 5119 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5120 return true; 5121 } 5122 } 5123 5124 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5125 5126 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5127 BE = RD->bases_end(); BI != BE; ++BI) 5128 if (!BI->isVirtual() && 5129 SMI.shouldDeleteForBase(BI)) 5130 return true; 5131 5132 // Per DR1611, do not consider virtual bases of constructors of abstract 5133 // classes, since we are not going to construct them. 5134 if (!RD->isAbstract() || !SMI.IsConstructor) { 5135 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5136 BE = RD->vbases_end(); 5137 BI != BE; ++BI) 5138 if (SMI.shouldDeleteForBase(BI)) 5139 return true; 5140 } 5141 5142 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5143 FE = RD->field_end(); FI != FE; ++FI) 5144 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5145 SMI.shouldDeleteForField(*FI)) 5146 return true; 5147 5148 if (SMI.shouldDeleteForAllConstMembers()) 5149 return true; 5150 5151 return false; 5152} 5153 5154/// Perform lookup for a special member of the specified kind, and determine 5155/// whether it is trivial. If the triviality can be determined without the 5156/// lookup, skip it. This is intended for use when determining whether a 5157/// special member of a containing object is trivial, and thus does not ever 5158/// perform overload resolution for default constructors. 5159/// 5160/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5161/// member that was most likely to be intended to be trivial, if any. 5162static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5163 Sema::CXXSpecialMember CSM, unsigned Quals, 5164 CXXMethodDecl **Selected) { 5165 if (Selected) 5166 *Selected = 0; 5167 5168 switch (CSM) { 5169 case Sema::CXXInvalid: 5170 llvm_unreachable("not a special member"); 5171 5172 case Sema::CXXDefaultConstructor: 5173 // C++11 [class.ctor]p5: 5174 // A default constructor is trivial if: 5175 // - all the [direct subobjects] have trivial default constructors 5176 // 5177 // Note, no overload resolution is performed in this case. 5178 if (RD->hasTrivialDefaultConstructor()) 5179 return true; 5180 5181 if (Selected) { 5182 // If there's a default constructor which could have been trivial, dig it 5183 // out. Otherwise, if there's any user-provided default constructor, point 5184 // to that as an example of why there's not a trivial one. 5185 CXXConstructorDecl *DefCtor = 0; 5186 if (RD->needsImplicitDefaultConstructor()) 5187 S.DeclareImplicitDefaultConstructor(RD); 5188 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5189 CE = RD->ctor_end(); CI != CE; ++CI) { 5190 if (!CI->isDefaultConstructor()) 5191 continue; 5192 DefCtor = *CI; 5193 if (!DefCtor->isUserProvided()) 5194 break; 5195 } 5196 5197 *Selected = DefCtor; 5198 } 5199 5200 return false; 5201 5202 case Sema::CXXDestructor: 5203 // C++11 [class.dtor]p5: 5204 // A destructor is trivial if: 5205 // - all the direct [subobjects] have trivial destructors 5206 if (RD->hasTrivialDestructor()) 5207 return true; 5208 5209 if (Selected) { 5210 if (RD->needsImplicitDestructor()) 5211 S.DeclareImplicitDestructor(RD); 5212 *Selected = RD->getDestructor(); 5213 } 5214 5215 return false; 5216 5217 case Sema::CXXCopyConstructor: 5218 // C++11 [class.copy]p12: 5219 // A copy constructor is trivial if: 5220 // - the constructor selected to copy each direct [subobject] is trivial 5221 if (RD->hasTrivialCopyConstructor()) { 5222 if (Quals == Qualifiers::Const) 5223 // We must either select the trivial copy constructor or reach an 5224 // ambiguity; no need to actually perform overload resolution. 5225 return true; 5226 } else if (!Selected) { 5227 return false; 5228 } 5229 // In C++98, we are not supposed to perform overload resolution here, but we 5230 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5231 // cases like B as having a non-trivial copy constructor: 5232 // struct A { template<typename T> A(T&); }; 5233 // struct B { mutable A a; }; 5234 goto NeedOverloadResolution; 5235 5236 case Sema::CXXCopyAssignment: 5237 // C++11 [class.copy]p25: 5238 // A copy assignment operator is trivial if: 5239 // - the assignment operator selected to copy each direct [subobject] is 5240 // trivial 5241 if (RD->hasTrivialCopyAssignment()) { 5242 if (Quals == Qualifiers::Const) 5243 return true; 5244 } else if (!Selected) { 5245 return false; 5246 } 5247 // In C++98, we are not supposed to perform overload resolution here, but we 5248 // treat that as a language defect. 5249 goto NeedOverloadResolution; 5250 5251 case Sema::CXXMoveConstructor: 5252 case Sema::CXXMoveAssignment: 5253 NeedOverloadResolution: 5254 Sema::SpecialMemberOverloadResult *SMOR = 5255 S.LookupSpecialMember(RD, CSM, 5256 Quals & Qualifiers::Const, 5257 Quals & Qualifiers::Volatile, 5258 /*RValueThis*/false, /*ConstThis*/false, 5259 /*VolatileThis*/false); 5260 5261 // The standard doesn't describe how to behave if the lookup is ambiguous. 5262 // We treat it as not making the member non-trivial, just like the standard 5263 // mandates for the default constructor. This should rarely matter, because 5264 // the member will also be deleted. 5265 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5266 return true; 5267 5268 if (!SMOR->getMethod()) { 5269 assert(SMOR->getKind() == 5270 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5271 return false; 5272 } 5273 5274 // We deliberately don't check if we found a deleted special member. We're 5275 // not supposed to! 5276 if (Selected) 5277 *Selected = SMOR->getMethod(); 5278 return SMOR->getMethod()->isTrivial(); 5279 } 5280 5281 llvm_unreachable("unknown special method kind"); 5282} 5283 5284static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5285 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5286 CI != CE; ++CI) 5287 if (!CI->isImplicit()) 5288 return *CI; 5289 5290 // Look for constructor templates. 5291 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5292 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5293 if (CXXConstructorDecl *CD = 5294 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5295 return CD; 5296 } 5297 5298 return 0; 5299} 5300 5301/// The kind of subobject we are checking for triviality. The values of this 5302/// enumeration are used in diagnostics. 5303enum TrivialSubobjectKind { 5304 /// The subobject is a base class. 5305 TSK_BaseClass, 5306 /// The subobject is a non-static data member. 5307 TSK_Field, 5308 /// The object is actually the complete object. 5309 TSK_CompleteObject 5310}; 5311 5312/// Check whether the special member selected for a given type would be trivial. 5313static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5314 QualType SubType, 5315 Sema::CXXSpecialMember CSM, 5316 TrivialSubobjectKind Kind, 5317 bool Diagnose) { 5318 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5319 if (!SubRD) 5320 return true; 5321 5322 CXXMethodDecl *Selected; 5323 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5324 Diagnose ? &Selected : 0)) 5325 return true; 5326 5327 if (Diagnose) { 5328 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5329 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5330 << Kind << SubType.getUnqualifiedType(); 5331 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5332 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5333 } else if (!Selected) 5334 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5335 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5336 else if (Selected->isUserProvided()) { 5337 if (Kind == TSK_CompleteObject) 5338 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5339 << Kind << SubType.getUnqualifiedType() << CSM; 5340 else { 5341 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5342 << Kind << SubType.getUnqualifiedType() << CSM; 5343 S.Diag(Selected->getLocation(), diag::note_declared_at); 5344 } 5345 } else { 5346 if (Kind != TSK_CompleteObject) 5347 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5348 << Kind << SubType.getUnqualifiedType() << CSM; 5349 5350 // Explain why the defaulted or deleted special member isn't trivial. 5351 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5352 } 5353 } 5354 5355 return false; 5356} 5357 5358/// Check whether the members of a class type allow a special member to be 5359/// trivial. 5360static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5361 Sema::CXXSpecialMember CSM, 5362 bool ConstArg, bool Diagnose) { 5363 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5364 FE = RD->field_end(); FI != FE; ++FI) { 5365 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5366 continue; 5367 5368 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5369 5370 // Pretend anonymous struct or union members are members of this class. 5371 if (FI->isAnonymousStructOrUnion()) { 5372 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5373 CSM, ConstArg, Diagnose)) 5374 return false; 5375 continue; 5376 } 5377 5378 // C++11 [class.ctor]p5: 5379 // A default constructor is trivial if [...] 5380 // -- no non-static data member of its class has a 5381 // brace-or-equal-initializer 5382 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5383 if (Diagnose) 5384 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5385 return false; 5386 } 5387 5388 // Objective C ARC 4.3.5: 5389 // [...] nontrivally ownership-qualified types are [...] not trivially 5390 // default constructible, copy constructible, move constructible, copy 5391 // assignable, move assignable, or destructible [...] 5392 if (S.getLangOpts().ObjCAutoRefCount && 5393 FieldType.hasNonTrivialObjCLifetime()) { 5394 if (Diagnose) 5395 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5396 << RD << FieldType.getObjCLifetime(); 5397 return false; 5398 } 5399 5400 if (ConstArg && !FI->isMutable()) 5401 FieldType.addConst(); 5402 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5403 TSK_Field, Diagnose)) 5404 return false; 5405 } 5406 5407 return true; 5408} 5409 5410/// Diagnose why the specified class does not have a trivial special member of 5411/// the given kind. 5412void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5413 QualType Ty = Context.getRecordType(RD); 5414 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5415 Ty.addConst(); 5416 5417 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5418 TSK_CompleteObject, /*Diagnose*/true); 5419} 5420 5421/// Determine whether a defaulted or deleted special member function is trivial, 5422/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5423/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5424bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5425 bool Diagnose) { 5426 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5427 5428 CXXRecordDecl *RD = MD->getParent(); 5429 5430 bool ConstArg = false; 5431 5432 // C++11 [class.copy]p12, p25: 5433 // A [special member] is trivial if its declared parameter type is the same 5434 // as if it had been implicitly declared [...] 5435 switch (CSM) { 5436 case CXXDefaultConstructor: 5437 case CXXDestructor: 5438 // Trivial default constructors and destructors cannot have parameters. 5439 break; 5440 5441 case CXXCopyConstructor: 5442 case CXXCopyAssignment: { 5443 // Trivial copy operations always have const, non-volatile parameter types. 5444 ConstArg = true; 5445 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5446 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5447 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5448 if (Diagnose) 5449 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5450 << Param0->getSourceRange() << Param0->getType() 5451 << Context.getLValueReferenceType( 5452 Context.getRecordType(RD).withConst()); 5453 return false; 5454 } 5455 break; 5456 } 5457 5458 case CXXMoveConstructor: 5459 case CXXMoveAssignment: { 5460 // Trivial move operations always have non-cv-qualified parameters. 5461 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5462 const RValueReferenceType *RT = 5463 Param0->getType()->getAs<RValueReferenceType>(); 5464 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5465 if (Diagnose) 5466 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5467 << Param0->getSourceRange() << Param0->getType() 5468 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5469 return false; 5470 } 5471 break; 5472 } 5473 5474 case CXXInvalid: 5475 llvm_unreachable("not a special member"); 5476 } 5477 5478 // FIXME: We require that the parameter-declaration-clause is equivalent to 5479 // that of an implicit declaration, not just that the declared parameter type 5480 // matches, in order to prevent absuridities like a function simultaneously 5481 // being a trivial copy constructor and a non-trivial default constructor. 5482 // This issue has not yet been assigned a core issue number. 5483 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5484 if (Diagnose) 5485 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5486 diag::note_nontrivial_default_arg) 5487 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5488 return false; 5489 } 5490 if (MD->isVariadic()) { 5491 if (Diagnose) 5492 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5493 return false; 5494 } 5495 5496 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5497 // A copy/move [constructor or assignment operator] is trivial if 5498 // -- the [member] selected to copy/move each direct base class subobject 5499 // is trivial 5500 // 5501 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5502 // A [default constructor or destructor] is trivial if 5503 // -- all the direct base classes have trivial [default constructors or 5504 // destructors] 5505 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5506 BE = RD->bases_end(); BI != BE; ++BI) 5507 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5508 ConstArg ? BI->getType().withConst() 5509 : BI->getType(), 5510 CSM, TSK_BaseClass, Diagnose)) 5511 return false; 5512 5513 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5514 // A copy/move [constructor or assignment operator] for a class X is 5515 // trivial if 5516 // -- for each non-static data member of X that is of class type (or array 5517 // thereof), the constructor selected to copy/move that member is 5518 // trivial 5519 // 5520 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5521 // A [default constructor or destructor] is trivial if 5522 // -- for all of the non-static data members of its class that are of class 5523 // type (or array thereof), each such class has a trivial [default 5524 // constructor or destructor] 5525 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5526 return false; 5527 5528 // C++11 [class.dtor]p5: 5529 // A destructor is trivial if [...] 5530 // -- the destructor is not virtual 5531 if (CSM == CXXDestructor && MD->isVirtual()) { 5532 if (Diagnose) 5533 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5534 return false; 5535 } 5536 5537 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5538 // A [special member] for class X is trivial if [...] 5539 // -- class X has no virtual functions and no virtual base classes 5540 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5541 if (!Diagnose) 5542 return false; 5543 5544 if (RD->getNumVBases()) { 5545 // Check for virtual bases. We already know that the corresponding 5546 // member in all bases is trivial, so vbases must all be direct. 5547 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5548 assert(BS.isVirtual()); 5549 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5550 return false; 5551 } 5552 5553 // Must have a virtual method. 5554 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5555 ME = RD->method_end(); MI != ME; ++MI) { 5556 if (MI->isVirtual()) { 5557 SourceLocation MLoc = MI->getLocStart(); 5558 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5559 return false; 5560 } 5561 } 5562 5563 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5564 } 5565 5566 // Looks like it's trivial! 5567 return true; 5568} 5569 5570/// \brief Data used with FindHiddenVirtualMethod 5571namespace { 5572 struct FindHiddenVirtualMethodData { 5573 Sema *S; 5574 CXXMethodDecl *Method; 5575 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5576 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5577 }; 5578} 5579 5580/// \brief Check whether any most overriden method from MD in Methods 5581static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5582 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5583 if (MD->size_overridden_methods() == 0) 5584 return Methods.count(MD->getCanonicalDecl()); 5585 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5586 E = MD->end_overridden_methods(); 5587 I != E; ++I) 5588 if (CheckMostOverridenMethods(*I, Methods)) 5589 return true; 5590 return false; 5591} 5592 5593/// \brief Member lookup function that determines whether a given C++ 5594/// method overloads virtual methods in a base class without overriding any, 5595/// to be used with CXXRecordDecl::lookupInBases(). 5596static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5597 CXXBasePath &Path, 5598 void *UserData) { 5599 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5600 5601 FindHiddenVirtualMethodData &Data 5602 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5603 5604 DeclarationName Name = Data.Method->getDeclName(); 5605 assert(Name.getNameKind() == DeclarationName::Identifier); 5606 5607 bool foundSameNameMethod = false; 5608 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5609 for (Path.Decls = BaseRecord->lookup(Name); 5610 !Path.Decls.empty(); 5611 Path.Decls = Path.Decls.slice(1)) { 5612 NamedDecl *D = Path.Decls.front(); 5613 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5614 MD = MD->getCanonicalDecl(); 5615 foundSameNameMethod = true; 5616 // Interested only in hidden virtual methods. 5617 if (!MD->isVirtual()) 5618 continue; 5619 // If the method we are checking overrides a method from its base 5620 // don't warn about the other overloaded methods. 5621 if (!Data.S->IsOverload(Data.Method, MD, false)) 5622 return true; 5623 // Collect the overload only if its hidden. 5624 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5625 overloadedMethods.push_back(MD); 5626 } 5627 } 5628 5629 if (foundSameNameMethod) 5630 Data.OverloadedMethods.append(overloadedMethods.begin(), 5631 overloadedMethods.end()); 5632 return foundSameNameMethod; 5633} 5634 5635/// \brief Add the most overriden methods from MD to Methods 5636static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5637 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5638 if (MD->size_overridden_methods() == 0) 5639 Methods.insert(MD->getCanonicalDecl()); 5640 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5641 E = MD->end_overridden_methods(); 5642 I != E; ++I) 5643 AddMostOverridenMethods(*I, Methods); 5644} 5645 5646/// \brief Check if a method overloads virtual methods in a base class without 5647/// overriding any. 5648void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, 5649 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5650 if (!MD->getDeclName().isIdentifier()) 5651 return; 5652 5653 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5654 /*bool RecordPaths=*/false, 5655 /*bool DetectVirtual=*/false); 5656 FindHiddenVirtualMethodData Data; 5657 Data.Method = MD; 5658 Data.S = this; 5659 5660 // Keep the base methods that were overriden or introduced in the subclass 5661 // by 'using' in a set. A base method not in this set is hidden. 5662 CXXRecordDecl *DC = MD->getParent(); 5663 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5664 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5665 NamedDecl *ND = *I; 5666 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5667 ND = shad->getTargetDecl(); 5668 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5669 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5670 } 5671 5672 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths)) 5673 OverloadedMethods = Data.OverloadedMethods; 5674} 5675 5676void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, 5677 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5678 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { 5679 CXXMethodDecl *overloadedMD = OverloadedMethods[i]; 5680 PartialDiagnostic PD = PDiag( 5681 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5682 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5683 Diag(overloadedMD->getLocation(), PD); 5684 } 5685} 5686 5687/// \brief Diagnose methods which overload virtual methods in a base class 5688/// without overriding any. 5689void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { 5690 if (MD->isInvalidDecl()) 5691 return; 5692 5693 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5694 MD->getLocation()) == DiagnosticsEngine::Ignored) 5695 return; 5696 5697 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5698 FindHiddenVirtualMethods(MD, OverloadedMethods); 5699 if (!OverloadedMethods.empty()) { 5700 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5701 << MD << (OverloadedMethods.size() > 1); 5702 5703 NoteHiddenVirtualMethods(MD, OverloadedMethods); 5704 } 5705} 5706 5707void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5708 Decl *TagDecl, 5709 SourceLocation LBrac, 5710 SourceLocation RBrac, 5711 AttributeList *AttrList) { 5712 if (!TagDecl) 5713 return; 5714 5715 AdjustDeclIfTemplate(TagDecl); 5716 5717 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5718 if (l->getKind() != AttributeList::AT_Visibility) 5719 continue; 5720 l->setInvalid(); 5721 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5722 l->getName(); 5723 } 5724 5725 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5726 // strict aliasing violation! 5727 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5728 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5729 5730 CheckCompletedCXXClass( 5731 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5732} 5733 5734/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5735/// special functions, such as the default constructor, copy 5736/// constructor, or destructor, to the given C++ class (C++ 5737/// [special]p1). This routine can only be executed just before the 5738/// definition of the class is complete. 5739void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5740 if (!ClassDecl->hasUserDeclaredConstructor()) 5741 ++ASTContext::NumImplicitDefaultConstructors; 5742 5743 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5744 ++ASTContext::NumImplicitCopyConstructors; 5745 5746 // If the properties or semantics of the copy constructor couldn't be 5747 // determined while the class was being declared, force a declaration 5748 // of it now. 5749 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5750 DeclareImplicitCopyConstructor(ClassDecl); 5751 } 5752 5753 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5754 ++ASTContext::NumImplicitMoveConstructors; 5755 5756 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5757 DeclareImplicitMoveConstructor(ClassDecl); 5758 } 5759 5760 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5761 ++ASTContext::NumImplicitCopyAssignmentOperators; 5762 5763 // If we have a dynamic class, then the copy assignment operator may be 5764 // virtual, so we have to declare it immediately. This ensures that, e.g., 5765 // it shows up in the right place in the vtable and that we diagnose 5766 // problems with the implicit exception specification. 5767 if (ClassDecl->isDynamicClass() || 5768 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5769 DeclareImplicitCopyAssignment(ClassDecl); 5770 } 5771 5772 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5773 ++ASTContext::NumImplicitMoveAssignmentOperators; 5774 5775 // Likewise for the move assignment operator. 5776 if (ClassDecl->isDynamicClass() || 5777 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5778 DeclareImplicitMoveAssignment(ClassDecl); 5779 } 5780 5781 if (!ClassDecl->hasUserDeclaredDestructor()) { 5782 ++ASTContext::NumImplicitDestructors; 5783 5784 // If we have a dynamic class, then the destructor may be virtual, so we 5785 // have to declare the destructor immediately. This ensures that, e.g., it 5786 // shows up in the right place in the vtable and that we diagnose problems 5787 // with the implicit exception specification. 5788 if (ClassDecl->isDynamicClass() || 5789 ClassDecl->needsOverloadResolutionForDestructor()) 5790 DeclareImplicitDestructor(ClassDecl); 5791 } 5792} 5793 5794void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5795 if (!D) 5796 return; 5797 5798 int NumParamList = D->getNumTemplateParameterLists(); 5799 for (int i = 0; i < NumParamList; i++) { 5800 TemplateParameterList* Params = D->getTemplateParameterList(i); 5801 for (TemplateParameterList::iterator Param = Params->begin(), 5802 ParamEnd = Params->end(); 5803 Param != ParamEnd; ++Param) { 5804 NamedDecl *Named = cast<NamedDecl>(*Param); 5805 if (Named->getDeclName()) { 5806 S->AddDecl(Named); 5807 IdResolver.AddDecl(Named); 5808 } 5809 } 5810 } 5811} 5812 5813void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5814 if (!D) 5815 return; 5816 5817 TemplateParameterList *Params = 0; 5818 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5819 Params = Template->getTemplateParameters(); 5820 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5821 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5822 Params = PartialSpec->getTemplateParameters(); 5823 else 5824 return; 5825 5826 for (TemplateParameterList::iterator Param = Params->begin(), 5827 ParamEnd = Params->end(); 5828 Param != ParamEnd; ++Param) { 5829 NamedDecl *Named = cast<NamedDecl>(*Param); 5830 if (Named->getDeclName()) { 5831 S->AddDecl(Named); 5832 IdResolver.AddDecl(Named); 5833 } 5834 } 5835} 5836 5837void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5838 if (!RecordD) return; 5839 AdjustDeclIfTemplate(RecordD); 5840 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5841 PushDeclContext(S, Record); 5842} 5843 5844void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5845 if (!RecordD) return; 5846 PopDeclContext(); 5847} 5848 5849/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5850/// parsing a top-level (non-nested) C++ class, and we are now 5851/// parsing those parts of the given Method declaration that could 5852/// not be parsed earlier (C++ [class.mem]p2), such as default 5853/// arguments. This action should enter the scope of the given 5854/// Method declaration as if we had just parsed the qualified method 5855/// name. However, it should not bring the parameters into scope; 5856/// that will be performed by ActOnDelayedCXXMethodParameter. 5857void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5858} 5859 5860/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5861/// C++ method declaration. We're (re-)introducing the given 5862/// function parameter into scope for use in parsing later parts of 5863/// the method declaration. For example, we could see an 5864/// ActOnParamDefaultArgument event for this parameter. 5865void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5866 if (!ParamD) 5867 return; 5868 5869 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5870 5871 // If this parameter has an unparsed default argument, clear it out 5872 // to make way for the parsed default argument. 5873 if (Param->hasUnparsedDefaultArg()) 5874 Param->setDefaultArg(0); 5875 5876 S->AddDecl(Param); 5877 if (Param->getDeclName()) 5878 IdResolver.AddDecl(Param); 5879} 5880 5881/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5882/// processing the delayed method declaration for Method. The method 5883/// declaration is now considered finished. There may be a separate 5884/// ActOnStartOfFunctionDef action later (not necessarily 5885/// immediately!) for this method, if it was also defined inside the 5886/// class body. 5887void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5888 if (!MethodD) 5889 return; 5890 5891 AdjustDeclIfTemplate(MethodD); 5892 5893 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5894 5895 // Now that we have our default arguments, check the constructor 5896 // again. It could produce additional diagnostics or affect whether 5897 // the class has implicitly-declared destructors, among other 5898 // things. 5899 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5900 CheckConstructor(Constructor); 5901 5902 // Check the default arguments, which we may have added. 5903 if (!Method->isInvalidDecl()) 5904 CheckCXXDefaultArguments(Method); 5905} 5906 5907/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5908/// the well-formedness of the constructor declarator @p D with type @p 5909/// R. If there are any errors in the declarator, this routine will 5910/// emit diagnostics and set the invalid bit to true. In any case, the type 5911/// will be updated to reflect a well-formed type for the constructor and 5912/// returned. 5913QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5914 StorageClass &SC) { 5915 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5916 5917 // C++ [class.ctor]p3: 5918 // A constructor shall not be virtual (10.3) or static (9.4). A 5919 // constructor can be invoked for a const, volatile or const 5920 // volatile object. A constructor shall not be declared const, 5921 // volatile, or const volatile (9.3.2). 5922 if (isVirtual) { 5923 if (!D.isInvalidType()) 5924 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5925 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5926 << SourceRange(D.getIdentifierLoc()); 5927 D.setInvalidType(); 5928 } 5929 if (SC == SC_Static) { 5930 if (!D.isInvalidType()) 5931 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5932 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5933 << SourceRange(D.getIdentifierLoc()); 5934 D.setInvalidType(); 5935 SC = SC_None; 5936 } 5937 5938 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5939 if (FTI.TypeQuals != 0) { 5940 if (FTI.TypeQuals & Qualifiers::Const) 5941 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5942 << "const" << SourceRange(D.getIdentifierLoc()); 5943 if (FTI.TypeQuals & Qualifiers::Volatile) 5944 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5945 << "volatile" << SourceRange(D.getIdentifierLoc()); 5946 if (FTI.TypeQuals & Qualifiers::Restrict) 5947 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5948 << "restrict" << SourceRange(D.getIdentifierLoc()); 5949 D.setInvalidType(); 5950 } 5951 5952 // C++0x [class.ctor]p4: 5953 // A constructor shall not be declared with a ref-qualifier. 5954 if (FTI.hasRefQualifier()) { 5955 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5956 << FTI.RefQualifierIsLValueRef 5957 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5958 D.setInvalidType(); 5959 } 5960 5961 // Rebuild the function type "R" without any type qualifiers (in 5962 // case any of the errors above fired) and with "void" as the 5963 // return type, since constructors don't have return types. 5964 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5965 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5966 return R; 5967 5968 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5969 EPI.TypeQuals = 0; 5970 EPI.RefQualifier = RQ_None; 5971 5972 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5973} 5974 5975/// CheckConstructor - Checks a fully-formed constructor for 5976/// well-formedness, issuing any diagnostics required. Returns true if 5977/// the constructor declarator is invalid. 5978void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5979 CXXRecordDecl *ClassDecl 5980 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5981 if (!ClassDecl) 5982 return Constructor->setInvalidDecl(); 5983 5984 // C++ [class.copy]p3: 5985 // A declaration of a constructor for a class X is ill-formed if 5986 // its first parameter is of type (optionally cv-qualified) X and 5987 // either there are no other parameters or else all other 5988 // parameters have default arguments. 5989 if (!Constructor->isInvalidDecl() && 5990 ((Constructor->getNumParams() == 1) || 5991 (Constructor->getNumParams() > 1 && 5992 Constructor->getParamDecl(1)->hasDefaultArg())) && 5993 Constructor->getTemplateSpecializationKind() 5994 != TSK_ImplicitInstantiation) { 5995 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5996 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5997 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5998 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5999 const char *ConstRef 6000 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 6001 : " const &"; 6002 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 6003 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 6004 6005 // FIXME: Rather that making the constructor invalid, we should endeavor 6006 // to fix the type. 6007 Constructor->setInvalidDecl(); 6008 } 6009 } 6010} 6011 6012/// CheckDestructor - Checks a fully-formed destructor definition for 6013/// well-formedness, issuing any diagnostics required. Returns true 6014/// on error. 6015bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 6016 CXXRecordDecl *RD = Destructor->getParent(); 6017 6018 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 6019 SourceLocation Loc; 6020 6021 if (!Destructor->isImplicit()) 6022 Loc = Destructor->getLocation(); 6023 else 6024 Loc = RD->getLocation(); 6025 6026 // If we have a virtual destructor, look up the deallocation function 6027 FunctionDecl *OperatorDelete = 0; 6028 DeclarationName Name = 6029 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 6030 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 6031 return true; 6032 6033 MarkFunctionReferenced(Loc, OperatorDelete); 6034 6035 Destructor->setOperatorDelete(OperatorDelete); 6036 } 6037 6038 return false; 6039} 6040 6041static inline bool 6042FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 6043 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 6044 FTI.ArgInfo[0].Param && 6045 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 6046} 6047 6048/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 6049/// the well-formednes of the destructor declarator @p D with type @p 6050/// R. If there are any errors in the declarator, this routine will 6051/// emit diagnostics and set the declarator to invalid. Even if this happens, 6052/// will be updated to reflect a well-formed type for the destructor and 6053/// returned. 6054QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 6055 StorageClass& SC) { 6056 // C++ [class.dtor]p1: 6057 // [...] A typedef-name that names a class is a class-name 6058 // (7.1.3); however, a typedef-name that names a class shall not 6059 // be used as the identifier in the declarator for a destructor 6060 // declaration. 6061 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 6062 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 6063 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6064 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 6065 else if (const TemplateSpecializationType *TST = 6066 DeclaratorType->getAs<TemplateSpecializationType>()) 6067 if (TST->isTypeAlias()) 6068 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6069 << DeclaratorType << 1; 6070 6071 // C++ [class.dtor]p2: 6072 // A destructor is used to destroy objects of its class type. A 6073 // destructor takes no parameters, and no return type can be 6074 // specified for it (not even void). The address of a destructor 6075 // shall not be taken. A destructor shall not be static. A 6076 // destructor can be invoked for a const, volatile or const 6077 // volatile object. A destructor shall not be declared const, 6078 // volatile or const volatile (9.3.2). 6079 if (SC == SC_Static) { 6080 if (!D.isInvalidType()) 6081 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 6082 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6083 << SourceRange(D.getIdentifierLoc()) 6084 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 6085 6086 SC = SC_None; 6087 } 6088 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6089 // Destructors don't have return types, but the parser will 6090 // happily parse something like: 6091 // 6092 // class X { 6093 // float ~X(); 6094 // }; 6095 // 6096 // The return type will be eliminated later. 6097 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 6098 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6099 << SourceRange(D.getIdentifierLoc()); 6100 } 6101 6102 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6103 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 6104 if (FTI.TypeQuals & Qualifiers::Const) 6105 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6106 << "const" << SourceRange(D.getIdentifierLoc()); 6107 if (FTI.TypeQuals & Qualifiers::Volatile) 6108 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6109 << "volatile" << SourceRange(D.getIdentifierLoc()); 6110 if (FTI.TypeQuals & Qualifiers::Restrict) 6111 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6112 << "restrict" << SourceRange(D.getIdentifierLoc()); 6113 D.setInvalidType(); 6114 } 6115 6116 // C++0x [class.dtor]p2: 6117 // A destructor shall not be declared with a ref-qualifier. 6118 if (FTI.hasRefQualifier()) { 6119 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6120 << FTI.RefQualifierIsLValueRef 6121 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6122 D.setInvalidType(); 6123 } 6124 6125 // Make sure we don't have any parameters. 6126 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6127 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6128 6129 // Delete the parameters. 6130 FTI.freeArgs(); 6131 D.setInvalidType(); 6132 } 6133 6134 // Make sure the destructor isn't variadic. 6135 if (FTI.isVariadic) { 6136 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6137 D.setInvalidType(); 6138 } 6139 6140 // Rebuild the function type "R" without any type qualifiers or 6141 // parameters (in case any of the errors above fired) and with 6142 // "void" as the return type, since destructors don't have return 6143 // types. 6144 if (!D.isInvalidType()) 6145 return R; 6146 6147 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6148 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6149 EPI.Variadic = false; 6150 EPI.TypeQuals = 0; 6151 EPI.RefQualifier = RQ_None; 6152 return Context.getFunctionType(Context.VoidTy, None, EPI); 6153} 6154 6155/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6156/// well-formednes of the conversion function declarator @p D with 6157/// type @p R. If there are any errors in the declarator, this routine 6158/// will emit diagnostics and return true. Otherwise, it will return 6159/// false. Either way, the type @p R will be updated to reflect a 6160/// well-formed type for the conversion operator. 6161void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6162 StorageClass& SC) { 6163 // C++ [class.conv.fct]p1: 6164 // Neither parameter types nor return type can be specified. The 6165 // type of a conversion function (8.3.5) is "function taking no 6166 // parameter returning conversion-type-id." 6167 if (SC == SC_Static) { 6168 if (!D.isInvalidType()) 6169 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6170 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6171 << D.getName().getSourceRange(); 6172 D.setInvalidType(); 6173 SC = SC_None; 6174 } 6175 6176 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6177 6178 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6179 // Conversion functions don't have return types, but the parser will 6180 // happily parse something like: 6181 // 6182 // class X { 6183 // float operator bool(); 6184 // }; 6185 // 6186 // The return type will be changed later anyway. 6187 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6188 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6189 << SourceRange(D.getIdentifierLoc()); 6190 D.setInvalidType(); 6191 } 6192 6193 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6194 6195 // Make sure we don't have any parameters. 6196 if (Proto->getNumArgs() > 0) { 6197 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6198 6199 // Delete the parameters. 6200 D.getFunctionTypeInfo().freeArgs(); 6201 D.setInvalidType(); 6202 } else if (Proto->isVariadic()) { 6203 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6204 D.setInvalidType(); 6205 } 6206 6207 // Diagnose "&operator bool()" and other such nonsense. This 6208 // is actually a gcc extension which we don't support. 6209 if (Proto->getResultType() != ConvType) { 6210 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6211 << Proto->getResultType(); 6212 D.setInvalidType(); 6213 ConvType = Proto->getResultType(); 6214 } 6215 6216 // C++ [class.conv.fct]p4: 6217 // The conversion-type-id shall not represent a function type nor 6218 // an array type. 6219 if (ConvType->isArrayType()) { 6220 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6221 ConvType = Context.getPointerType(ConvType); 6222 D.setInvalidType(); 6223 } else if (ConvType->isFunctionType()) { 6224 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6225 ConvType = Context.getPointerType(ConvType); 6226 D.setInvalidType(); 6227 } 6228 6229 // Rebuild the function type "R" without any parameters (in case any 6230 // of the errors above fired) and with the conversion type as the 6231 // return type. 6232 if (D.isInvalidType()) 6233 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6234 6235 // C++0x explicit conversion operators. 6236 if (D.getDeclSpec().isExplicitSpecified()) 6237 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6238 getLangOpts().CPlusPlus11 ? 6239 diag::warn_cxx98_compat_explicit_conversion_functions : 6240 diag::ext_explicit_conversion_functions) 6241 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6242} 6243 6244/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6245/// the declaration of the given C++ conversion function. This routine 6246/// is responsible for recording the conversion function in the C++ 6247/// class, if possible. 6248Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6249 assert(Conversion && "Expected to receive a conversion function declaration"); 6250 6251 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6252 6253 // Make sure we aren't redeclaring the conversion function. 6254 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6255 6256 // C++ [class.conv.fct]p1: 6257 // [...] A conversion function is never used to convert a 6258 // (possibly cv-qualified) object to the (possibly cv-qualified) 6259 // same object type (or a reference to it), to a (possibly 6260 // cv-qualified) base class of that type (or a reference to it), 6261 // or to (possibly cv-qualified) void. 6262 // FIXME: Suppress this warning if the conversion function ends up being a 6263 // virtual function that overrides a virtual function in a base class. 6264 QualType ClassType 6265 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6266 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6267 ConvType = ConvTypeRef->getPointeeType(); 6268 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6269 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6270 /* Suppress diagnostics for instantiations. */; 6271 else if (ConvType->isRecordType()) { 6272 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6273 if (ConvType == ClassType) 6274 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6275 << ClassType; 6276 else if (IsDerivedFrom(ClassType, ConvType)) 6277 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6278 << ClassType << ConvType; 6279 } else if (ConvType->isVoidType()) { 6280 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6281 << ClassType << ConvType; 6282 } 6283 6284 if (FunctionTemplateDecl *ConversionTemplate 6285 = Conversion->getDescribedFunctionTemplate()) 6286 return ConversionTemplate; 6287 6288 return Conversion; 6289} 6290 6291//===----------------------------------------------------------------------===// 6292// Namespace Handling 6293//===----------------------------------------------------------------------===// 6294 6295/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6296/// reopened. 6297static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6298 SourceLocation Loc, 6299 IdentifierInfo *II, bool *IsInline, 6300 NamespaceDecl *PrevNS) { 6301 assert(*IsInline != PrevNS->isInline()); 6302 6303 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6304 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6305 // inline namespaces, with the intention of bringing names into namespace std. 6306 // 6307 // We support this just well enough to get that case working; this is not 6308 // sufficient to support reopening namespaces as inline in general. 6309 if (*IsInline && II && II->getName().startswith("__atomic") && 6310 S.getSourceManager().isInSystemHeader(Loc)) { 6311 // Mark all prior declarations of the namespace as inline. 6312 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6313 NS = NS->getPreviousDecl()) 6314 NS->setInline(*IsInline); 6315 // Patch up the lookup table for the containing namespace. This isn't really 6316 // correct, but it's good enough for this particular case. 6317 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6318 E = PrevNS->decls_end(); I != E; ++I) 6319 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6320 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6321 return; 6322 } 6323 6324 if (PrevNS->isInline()) 6325 // The user probably just forgot the 'inline', so suggest that it 6326 // be added back. 6327 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6328 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6329 else 6330 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6331 << IsInline; 6332 6333 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6334 *IsInline = PrevNS->isInline(); 6335} 6336 6337/// ActOnStartNamespaceDef - This is called at the start of a namespace 6338/// definition. 6339Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6340 SourceLocation InlineLoc, 6341 SourceLocation NamespaceLoc, 6342 SourceLocation IdentLoc, 6343 IdentifierInfo *II, 6344 SourceLocation LBrace, 6345 AttributeList *AttrList) { 6346 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6347 // For anonymous namespace, take the location of the left brace. 6348 SourceLocation Loc = II ? IdentLoc : LBrace; 6349 bool IsInline = InlineLoc.isValid(); 6350 bool IsInvalid = false; 6351 bool IsStd = false; 6352 bool AddToKnown = false; 6353 Scope *DeclRegionScope = NamespcScope->getParent(); 6354 6355 NamespaceDecl *PrevNS = 0; 6356 if (II) { 6357 // C++ [namespace.def]p2: 6358 // The identifier in an original-namespace-definition shall not 6359 // have been previously defined in the declarative region in 6360 // which the original-namespace-definition appears. The 6361 // identifier in an original-namespace-definition is the name of 6362 // the namespace. Subsequently in that declarative region, it is 6363 // treated as an original-namespace-name. 6364 // 6365 // Since namespace names are unique in their scope, and we don't 6366 // look through using directives, just look for any ordinary names. 6367 6368 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6369 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6370 Decl::IDNS_Namespace; 6371 NamedDecl *PrevDecl = 0; 6372 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6373 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6374 ++I) { 6375 if ((*I)->getIdentifierNamespace() & IDNS) { 6376 PrevDecl = *I; 6377 break; 6378 } 6379 } 6380 6381 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6382 6383 if (PrevNS) { 6384 // This is an extended namespace definition. 6385 if (IsInline != PrevNS->isInline()) 6386 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6387 &IsInline, PrevNS); 6388 } else if (PrevDecl) { 6389 // This is an invalid name redefinition. 6390 Diag(Loc, diag::err_redefinition_different_kind) 6391 << II; 6392 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6393 IsInvalid = true; 6394 // Continue on to push Namespc as current DeclContext and return it. 6395 } else if (II->isStr("std") && 6396 CurContext->getRedeclContext()->isTranslationUnit()) { 6397 // This is the first "real" definition of the namespace "std", so update 6398 // our cache of the "std" namespace to point at this definition. 6399 PrevNS = getStdNamespace(); 6400 IsStd = true; 6401 AddToKnown = !IsInline; 6402 } else { 6403 // We've seen this namespace for the first time. 6404 AddToKnown = !IsInline; 6405 } 6406 } else { 6407 // Anonymous namespaces. 6408 6409 // Determine whether the parent already has an anonymous namespace. 6410 DeclContext *Parent = CurContext->getRedeclContext(); 6411 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6412 PrevNS = TU->getAnonymousNamespace(); 6413 } else { 6414 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6415 PrevNS = ND->getAnonymousNamespace(); 6416 } 6417 6418 if (PrevNS && IsInline != PrevNS->isInline()) 6419 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6420 &IsInline, PrevNS); 6421 } 6422 6423 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6424 StartLoc, Loc, II, PrevNS); 6425 if (IsInvalid) 6426 Namespc->setInvalidDecl(); 6427 6428 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6429 6430 // FIXME: Should we be merging attributes? 6431 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6432 PushNamespaceVisibilityAttr(Attr, Loc); 6433 6434 if (IsStd) 6435 StdNamespace = Namespc; 6436 if (AddToKnown) 6437 KnownNamespaces[Namespc] = false; 6438 6439 if (II) { 6440 PushOnScopeChains(Namespc, DeclRegionScope); 6441 } else { 6442 // Link the anonymous namespace into its parent. 6443 DeclContext *Parent = CurContext->getRedeclContext(); 6444 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6445 TU->setAnonymousNamespace(Namespc); 6446 } else { 6447 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6448 } 6449 6450 CurContext->addDecl(Namespc); 6451 6452 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6453 // behaves as if it were replaced by 6454 // namespace unique { /* empty body */ } 6455 // using namespace unique; 6456 // namespace unique { namespace-body } 6457 // where all occurrences of 'unique' in a translation unit are 6458 // replaced by the same identifier and this identifier differs 6459 // from all other identifiers in the entire program. 6460 6461 // We just create the namespace with an empty name and then add an 6462 // implicit using declaration, just like the standard suggests. 6463 // 6464 // CodeGen enforces the "universally unique" aspect by giving all 6465 // declarations semantically contained within an anonymous 6466 // namespace internal linkage. 6467 6468 if (!PrevNS) { 6469 UsingDirectiveDecl* UD 6470 = UsingDirectiveDecl::Create(Context, Parent, 6471 /* 'using' */ LBrace, 6472 /* 'namespace' */ SourceLocation(), 6473 /* qualifier */ NestedNameSpecifierLoc(), 6474 /* identifier */ SourceLocation(), 6475 Namespc, 6476 /* Ancestor */ Parent); 6477 UD->setImplicit(); 6478 Parent->addDecl(UD); 6479 } 6480 } 6481 6482 ActOnDocumentableDecl(Namespc); 6483 6484 // Although we could have an invalid decl (i.e. the namespace name is a 6485 // redefinition), push it as current DeclContext and try to continue parsing. 6486 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6487 // for the namespace has the declarations that showed up in that particular 6488 // namespace definition. 6489 PushDeclContext(NamespcScope, Namespc); 6490 return Namespc; 6491} 6492 6493/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6494/// is a namespace alias, returns the namespace it points to. 6495static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6496 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6497 return AD->getNamespace(); 6498 return dyn_cast_or_null<NamespaceDecl>(D); 6499} 6500 6501/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6502/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6503void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6504 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6505 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6506 Namespc->setRBraceLoc(RBrace); 6507 PopDeclContext(); 6508 if (Namespc->hasAttr<VisibilityAttr>()) 6509 PopPragmaVisibility(true, RBrace); 6510} 6511 6512CXXRecordDecl *Sema::getStdBadAlloc() const { 6513 return cast_or_null<CXXRecordDecl>( 6514 StdBadAlloc.get(Context.getExternalSource())); 6515} 6516 6517NamespaceDecl *Sema::getStdNamespace() const { 6518 return cast_or_null<NamespaceDecl>( 6519 StdNamespace.get(Context.getExternalSource())); 6520} 6521 6522/// \brief Retrieve the special "std" namespace, which may require us to 6523/// implicitly define the namespace. 6524NamespaceDecl *Sema::getOrCreateStdNamespace() { 6525 if (!StdNamespace) { 6526 // The "std" namespace has not yet been defined, so build one implicitly. 6527 StdNamespace = NamespaceDecl::Create(Context, 6528 Context.getTranslationUnitDecl(), 6529 /*Inline=*/false, 6530 SourceLocation(), SourceLocation(), 6531 &PP.getIdentifierTable().get("std"), 6532 /*PrevDecl=*/0); 6533 getStdNamespace()->setImplicit(true); 6534 } 6535 6536 return getStdNamespace(); 6537} 6538 6539bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6540 assert(getLangOpts().CPlusPlus && 6541 "Looking for std::initializer_list outside of C++."); 6542 6543 // We're looking for implicit instantiations of 6544 // template <typename E> class std::initializer_list. 6545 6546 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6547 return false; 6548 6549 ClassTemplateDecl *Template = 0; 6550 const TemplateArgument *Arguments = 0; 6551 6552 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6553 6554 ClassTemplateSpecializationDecl *Specialization = 6555 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6556 if (!Specialization) 6557 return false; 6558 6559 Template = Specialization->getSpecializedTemplate(); 6560 Arguments = Specialization->getTemplateArgs().data(); 6561 } else if (const TemplateSpecializationType *TST = 6562 Ty->getAs<TemplateSpecializationType>()) { 6563 Template = dyn_cast_or_null<ClassTemplateDecl>( 6564 TST->getTemplateName().getAsTemplateDecl()); 6565 Arguments = TST->getArgs(); 6566 } 6567 if (!Template) 6568 return false; 6569 6570 if (!StdInitializerList) { 6571 // Haven't recognized std::initializer_list yet, maybe this is it. 6572 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6573 if (TemplateClass->getIdentifier() != 6574 &PP.getIdentifierTable().get("initializer_list") || 6575 !getStdNamespace()->InEnclosingNamespaceSetOf( 6576 TemplateClass->getDeclContext())) 6577 return false; 6578 // This is a template called std::initializer_list, but is it the right 6579 // template? 6580 TemplateParameterList *Params = Template->getTemplateParameters(); 6581 if (Params->getMinRequiredArguments() != 1) 6582 return false; 6583 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6584 return false; 6585 6586 // It's the right template. 6587 StdInitializerList = Template; 6588 } 6589 6590 if (Template != StdInitializerList) 6591 return false; 6592 6593 // This is an instance of std::initializer_list. Find the argument type. 6594 if (Element) 6595 *Element = Arguments[0].getAsType(); 6596 return true; 6597} 6598 6599static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6600 NamespaceDecl *Std = S.getStdNamespace(); 6601 if (!Std) { 6602 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6603 return 0; 6604 } 6605 6606 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6607 Loc, Sema::LookupOrdinaryName); 6608 if (!S.LookupQualifiedName(Result, Std)) { 6609 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6610 return 0; 6611 } 6612 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6613 if (!Template) { 6614 Result.suppressDiagnostics(); 6615 // We found something weird. Complain about the first thing we found. 6616 NamedDecl *Found = *Result.begin(); 6617 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6618 return 0; 6619 } 6620 6621 // We found some template called std::initializer_list. Now verify that it's 6622 // correct. 6623 TemplateParameterList *Params = Template->getTemplateParameters(); 6624 if (Params->getMinRequiredArguments() != 1 || 6625 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6626 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6627 return 0; 6628 } 6629 6630 return Template; 6631} 6632 6633QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6634 if (!StdInitializerList) { 6635 StdInitializerList = LookupStdInitializerList(*this, Loc); 6636 if (!StdInitializerList) 6637 return QualType(); 6638 } 6639 6640 TemplateArgumentListInfo Args(Loc, Loc); 6641 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6642 Context.getTrivialTypeSourceInfo(Element, 6643 Loc))); 6644 return Context.getCanonicalType( 6645 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6646} 6647 6648bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6649 // C++ [dcl.init.list]p2: 6650 // A constructor is an initializer-list constructor if its first parameter 6651 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6652 // std::initializer_list<E> for some type E, and either there are no other 6653 // parameters or else all other parameters have default arguments. 6654 if (Ctor->getNumParams() < 1 || 6655 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6656 return false; 6657 6658 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6659 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6660 ArgType = RT->getPointeeType().getUnqualifiedType(); 6661 6662 return isStdInitializerList(ArgType, 0); 6663} 6664 6665/// \brief Determine whether a using statement is in a context where it will be 6666/// apply in all contexts. 6667static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6668 switch (CurContext->getDeclKind()) { 6669 case Decl::TranslationUnit: 6670 return true; 6671 case Decl::LinkageSpec: 6672 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6673 default: 6674 return false; 6675 } 6676} 6677 6678namespace { 6679 6680// Callback to only accept typo corrections that are namespaces. 6681class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6682public: 6683 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 6684 if (NamedDecl *ND = candidate.getCorrectionDecl()) 6685 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6686 return false; 6687 } 6688}; 6689 6690} 6691 6692static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6693 CXXScopeSpec &SS, 6694 SourceLocation IdentLoc, 6695 IdentifierInfo *Ident) { 6696 NamespaceValidatorCCC Validator; 6697 R.clear(); 6698 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6699 R.getLookupKind(), Sc, &SS, 6700 Validator)) { 6701 if (DeclContext *DC = S.computeDeclContext(SS, false)) { 6702 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6703 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && 6704 Ident->getName().equals(CorrectedStr); 6705 S.diagnoseTypo(Corrected, 6706 S.PDiag(diag::err_using_directive_member_suggest) 6707 << Ident << DC << DroppedSpecifier << SS.getRange(), 6708 S.PDiag(diag::note_namespace_defined_here)); 6709 } else { 6710 S.diagnoseTypo(Corrected, 6711 S.PDiag(diag::err_using_directive_suggest) << Ident, 6712 S.PDiag(diag::note_namespace_defined_here)); 6713 } 6714 R.addDecl(Corrected.getCorrectionDecl()); 6715 return true; 6716 } 6717 return false; 6718} 6719 6720Decl *Sema::ActOnUsingDirective(Scope *S, 6721 SourceLocation UsingLoc, 6722 SourceLocation NamespcLoc, 6723 CXXScopeSpec &SS, 6724 SourceLocation IdentLoc, 6725 IdentifierInfo *NamespcName, 6726 AttributeList *AttrList) { 6727 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6728 assert(NamespcName && "Invalid NamespcName."); 6729 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6730 6731 // This can only happen along a recovery path. 6732 while (S->getFlags() & Scope::TemplateParamScope) 6733 S = S->getParent(); 6734 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6735 6736 UsingDirectiveDecl *UDir = 0; 6737 NestedNameSpecifier *Qualifier = 0; 6738 if (SS.isSet()) 6739 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6740 6741 // Lookup namespace name. 6742 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6743 LookupParsedName(R, S, &SS); 6744 if (R.isAmbiguous()) 6745 return 0; 6746 6747 if (R.empty()) { 6748 R.clear(); 6749 // Allow "using namespace std;" or "using namespace ::std;" even if 6750 // "std" hasn't been defined yet, for GCC compatibility. 6751 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6752 NamespcName->isStr("std")) { 6753 Diag(IdentLoc, diag::ext_using_undefined_std); 6754 R.addDecl(getOrCreateStdNamespace()); 6755 R.resolveKind(); 6756 } 6757 // Otherwise, attempt typo correction. 6758 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6759 } 6760 6761 if (!R.empty()) { 6762 NamedDecl *Named = R.getFoundDecl(); 6763 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6764 && "expected namespace decl"); 6765 // C++ [namespace.udir]p1: 6766 // A using-directive specifies that the names in the nominated 6767 // namespace can be used in the scope in which the 6768 // using-directive appears after the using-directive. During 6769 // unqualified name lookup (3.4.1), the names appear as if they 6770 // were declared in the nearest enclosing namespace which 6771 // contains both the using-directive and the nominated 6772 // namespace. [Note: in this context, "contains" means "contains 6773 // directly or indirectly". ] 6774 6775 // Find enclosing context containing both using-directive and 6776 // nominated namespace. 6777 NamespaceDecl *NS = getNamespaceDecl(Named); 6778 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6779 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6780 CommonAncestor = CommonAncestor->getParent(); 6781 6782 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6783 SS.getWithLocInContext(Context), 6784 IdentLoc, Named, CommonAncestor); 6785 6786 if (IsUsingDirectiveInToplevelContext(CurContext) && 6787 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6788 Diag(IdentLoc, diag::warn_using_directive_in_header); 6789 } 6790 6791 PushUsingDirective(S, UDir); 6792 } else { 6793 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6794 } 6795 6796 if (UDir) 6797 ProcessDeclAttributeList(S, UDir, AttrList); 6798 6799 return UDir; 6800} 6801 6802void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6803 // If the scope has an associated entity and the using directive is at 6804 // namespace or translation unit scope, add the UsingDirectiveDecl into 6805 // its lookup structure so qualified name lookup can find it. 6806 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6807 if (Ctx && !Ctx->isFunctionOrMethod()) 6808 Ctx->addDecl(UDir); 6809 else 6810 // Otherwise, it is at block sope. The using-directives will affect lookup 6811 // only to the end of the scope. 6812 S->PushUsingDirective(UDir); 6813} 6814 6815 6816Decl *Sema::ActOnUsingDeclaration(Scope *S, 6817 AccessSpecifier AS, 6818 bool HasUsingKeyword, 6819 SourceLocation UsingLoc, 6820 CXXScopeSpec &SS, 6821 UnqualifiedId &Name, 6822 AttributeList *AttrList, 6823 bool HasTypenameKeyword, 6824 SourceLocation TypenameLoc) { 6825 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6826 6827 switch (Name.getKind()) { 6828 case UnqualifiedId::IK_ImplicitSelfParam: 6829 case UnqualifiedId::IK_Identifier: 6830 case UnqualifiedId::IK_OperatorFunctionId: 6831 case UnqualifiedId::IK_LiteralOperatorId: 6832 case UnqualifiedId::IK_ConversionFunctionId: 6833 break; 6834 6835 case UnqualifiedId::IK_ConstructorName: 6836 case UnqualifiedId::IK_ConstructorTemplateId: 6837 // C++11 inheriting constructors. 6838 Diag(Name.getLocStart(), 6839 getLangOpts().CPlusPlus11 ? 6840 diag::warn_cxx98_compat_using_decl_constructor : 6841 diag::err_using_decl_constructor) 6842 << SS.getRange(); 6843 6844 if (getLangOpts().CPlusPlus11) break; 6845 6846 return 0; 6847 6848 case UnqualifiedId::IK_DestructorName: 6849 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6850 << SS.getRange(); 6851 return 0; 6852 6853 case UnqualifiedId::IK_TemplateId: 6854 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6855 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6856 return 0; 6857 } 6858 6859 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6860 DeclarationName TargetName = TargetNameInfo.getName(); 6861 if (!TargetName) 6862 return 0; 6863 6864 // Warn about access declarations. 6865 if (!HasUsingKeyword) { 6866 Diag(Name.getLocStart(), 6867 getLangOpts().CPlusPlus11 ? diag::err_access_decl 6868 : diag::warn_access_decl_deprecated) 6869 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6870 } 6871 6872 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6873 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6874 return 0; 6875 6876 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6877 TargetNameInfo, AttrList, 6878 /* IsInstantiation */ false, 6879 HasTypenameKeyword, TypenameLoc); 6880 if (UD) 6881 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6882 6883 return UD; 6884} 6885 6886/// \brief Determine whether a using declaration considers the given 6887/// declarations as "equivalent", e.g., if they are redeclarations of 6888/// the same entity or are both typedefs of the same type. 6889static bool 6890IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6891 bool &SuppressRedeclaration) { 6892 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6893 SuppressRedeclaration = false; 6894 return true; 6895 } 6896 6897 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6898 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6899 SuppressRedeclaration = true; 6900 return Context.hasSameType(TD1->getUnderlyingType(), 6901 TD2->getUnderlyingType()); 6902 } 6903 6904 return false; 6905} 6906 6907 6908/// Determines whether to create a using shadow decl for a particular 6909/// decl, given the set of decls existing prior to this using lookup. 6910bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6911 const LookupResult &Previous) { 6912 // Diagnose finding a decl which is not from a base class of the 6913 // current class. We do this now because there are cases where this 6914 // function will silently decide not to build a shadow decl, which 6915 // will pre-empt further diagnostics. 6916 // 6917 // We don't need to do this in C++0x because we do the check once on 6918 // the qualifier. 6919 // 6920 // FIXME: diagnose the following if we care enough: 6921 // struct A { int foo; }; 6922 // struct B : A { using A::foo; }; 6923 // template <class T> struct C : A {}; 6924 // template <class T> struct D : C<T> { using B::foo; } // <--- 6925 // This is invalid (during instantiation) in C++03 because B::foo 6926 // resolves to the using decl in B, which is not a base class of D<T>. 6927 // We can't diagnose it immediately because C<T> is an unknown 6928 // specialization. The UsingShadowDecl in D<T> then points directly 6929 // to A::foo, which will look well-formed when we instantiate. 6930 // The right solution is to not collapse the shadow-decl chain. 6931 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6932 DeclContext *OrigDC = Orig->getDeclContext(); 6933 6934 // Handle enums and anonymous structs. 6935 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6936 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6937 while (OrigRec->isAnonymousStructOrUnion()) 6938 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6939 6940 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6941 if (OrigDC == CurContext) { 6942 Diag(Using->getLocation(), 6943 diag::err_using_decl_nested_name_specifier_is_current_class) 6944 << Using->getQualifierLoc().getSourceRange(); 6945 Diag(Orig->getLocation(), diag::note_using_decl_target); 6946 return true; 6947 } 6948 6949 Diag(Using->getQualifierLoc().getBeginLoc(), 6950 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6951 << Using->getQualifier() 6952 << cast<CXXRecordDecl>(CurContext) 6953 << Using->getQualifierLoc().getSourceRange(); 6954 Diag(Orig->getLocation(), diag::note_using_decl_target); 6955 return true; 6956 } 6957 } 6958 6959 if (Previous.empty()) return false; 6960 6961 NamedDecl *Target = Orig; 6962 if (isa<UsingShadowDecl>(Target)) 6963 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6964 6965 // If the target happens to be one of the previous declarations, we 6966 // don't have a conflict. 6967 // 6968 // FIXME: but we might be increasing its access, in which case we 6969 // should redeclare it. 6970 NamedDecl *NonTag = 0, *Tag = 0; 6971 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6972 I != E; ++I) { 6973 NamedDecl *D = (*I)->getUnderlyingDecl(); 6974 bool Result; 6975 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6976 return Result; 6977 6978 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6979 } 6980 6981 if (Target->isFunctionOrFunctionTemplate()) { 6982 FunctionDecl *FD; 6983 if (isa<FunctionTemplateDecl>(Target)) 6984 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6985 else 6986 FD = cast<FunctionDecl>(Target); 6987 6988 NamedDecl *OldDecl = 0; 6989 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6990 case Ovl_Overload: 6991 return false; 6992 6993 case Ovl_NonFunction: 6994 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6995 break; 6996 6997 // We found a decl with the exact signature. 6998 case Ovl_Match: 6999 // If we're in a record, we want to hide the target, so we 7000 // return true (without a diagnostic) to tell the caller not to 7001 // build a shadow decl. 7002 if (CurContext->isRecord()) 7003 return true; 7004 7005 // If we're not in a record, this is an error. 7006 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7007 break; 7008 } 7009 7010 Diag(Target->getLocation(), diag::note_using_decl_target); 7011 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 7012 return true; 7013 } 7014 7015 // Target is not a function. 7016 7017 if (isa<TagDecl>(Target)) { 7018 // No conflict between a tag and a non-tag. 7019 if (!Tag) return false; 7020 7021 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7022 Diag(Target->getLocation(), diag::note_using_decl_target); 7023 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 7024 return true; 7025 } 7026 7027 // No conflict between a tag and a non-tag. 7028 if (!NonTag) return false; 7029 7030 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7031 Diag(Target->getLocation(), diag::note_using_decl_target); 7032 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 7033 return true; 7034} 7035 7036/// Builds a shadow declaration corresponding to a 'using' declaration. 7037UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 7038 UsingDecl *UD, 7039 NamedDecl *Orig) { 7040 7041 // If we resolved to another shadow declaration, just coalesce them. 7042 NamedDecl *Target = Orig; 7043 if (isa<UsingShadowDecl>(Target)) { 7044 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7045 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 7046 } 7047 7048 UsingShadowDecl *Shadow 7049 = UsingShadowDecl::Create(Context, CurContext, 7050 UD->getLocation(), UD, Target); 7051 UD->addShadowDecl(Shadow); 7052 7053 Shadow->setAccess(UD->getAccess()); 7054 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 7055 Shadow->setInvalidDecl(); 7056 7057 if (S) 7058 PushOnScopeChains(Shadow, S); 7059 else 7060 CurContext->addDecl(Shadow); 7061 7062 7063 return Shadow; 7064} 7065 7066/// Hides a using shadow declaration. This is required by the current 7067/// using-decl implementation when a resolvable using declaration in a 7068/// class is followed by a declaration which would hide or override 7069/// one or more of the using decl's targets; for example: 7070/// 7071/// struct Base { void foo(int); }; 7072/// struct Derived : Base { 7073/// using Base::foo; 7074/// void foo(int); 7075/// }; 7076/// 7077/// The governing language is C++03 [namespace.udecl]p12: 7078/// 7079/// When a using-declaration brings names from a base class into a 7080/// derived class scope, member functions in the derived class 7081/// override and/or hide member functions with the same name and 7082/// parameter types in a base class (rather than conflicting). 7083/// 7084/// There are two ways to implement this: 7085/// (1) optimistically create shadow decls when they're not hidden 7086/// by existing declarations, or 7087/// (2) don't create any shadow decls (or at least don't make them 7088/// visible) until we've fully parsed/instantiated the class. 7089/// The problem with (1) is that we might have to retroactively remove 7090/// a shadow decl, which requires several O(n) operations because the 7091/// decl structures are (very reasonably) not designed for removal. 7092/// (2) avoids this but is very fiddly and phase-dependent. 7093void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 7094 if (Shadow->getDeclName().getNameKind() == 7095 DeclarationName::CXXConversionFunctionName) 7096 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 7097 7098 // Remove it from the DeclContext... 7099 Shadow->getDeclContext()->removeDecl(Shadow); 7100 7101 // ...and the scope, if applicable... 7102 if (S) { 7103 S->RemoveDecl(Shadow); 7104 IdResolver.RemoveDecl(Shadow); 7105 } 7106 7107 // ...and the using decl. 7108 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 7109 7110 // TODO: complain somehow if Shadow was used. It shouldn't 7111 // be possible for this to happen, because...? 7112} 7113 7114namespace { 7115class UsingValidatorCCC : public CorrectionCandidateCallback { 7116public: 7117 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation) 7118 : HasTypenameKeyword(HasTypenameKeyword), 7119 IsInstantiation(IsInstantiation) {} 7120 7121 bool ValidateCandidate(const TypoCorrection &Candidate) LLVM_OVERRIDE { 7122 NamedDecl *ND = Candidate.getCorrectionDecl(); 7123 7124 // Keywords are not valid here. 7125 if (!ND || isa<NamespaceDecl>(ND)) 7126 return false; 7127 7128 // Completely unqualified names are invalid for a 'using' declaration. 7129 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) 7130 return false; 7131 7132 if (isa<TypeDecl>(ND)) 7133 return HasTypenameKeyword || !IsInstantiation; 7134 7135 return !HasTypenameKeyword; 7136 } 7137 7138private: 7139 bool HasTypenameKeyword; 7140 bool IsInstantiation; 7141}; 7142} // end anonymous namespace 7143 7144/// Builds a using declaration. 7145/// 7146/// \param IsInstantiation - Whether this call arises from an 7147/// instantiation of an unresolved using declaration. We treat 7148/// the lookup differently for these declarations. 7149NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7150 SourceLocation UsingLoc, 7151 CXXScopeSpec &SS, 7152 const DeclarationNameInfo &NameInfo, 7153 AttributeList *AttrList, 7154 bool IsInstantiation, 7155 bool HasTypenameKeyword, 7156 SourceLocation TypenameLoc) { 7157 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7158 SourceLocation IdentLoc = NameInfo.getLoc(); 7159 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7160 7161 // FIXME: We ignore attributes for now. 7162 7163 if (SS.isEmpty()) { 7164 Diag(IdentLoc, diag::err_using_requires_qualname); 7165 return 0; 7166 } 7167 7168 // Do the redeclaration lookup in the current scope. 7169 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7170 ForRedeclaration); 7171 Previous.setHideTags(false); 7172 if (S) { 7173 LookupName(Previous, S); 7174 7175 // It is really dumb that we have to do this. 7176 LookupResult::Filter F = Previous.makeFilter(); 7177 while (F.hasNext()) { 7178 NamedDecl *D = F.next(); 7179 if (!isDeclInScope(D, CurContext, S)) 7180 F.erase(); 7181 } 7182 F.done(); 7183 } else { 7184 assert(IsInstantiation && "no scope in non-instantiation"); 7185 assert(CurContext->isRecord() && "scope not record in instantiation"); 7186 LookupQualifiedName(Previous, CurContext); 7187 } 7188 7189 // Check for invalid redeclarations. 7190 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, 7191 SS, IdentLoc, Previous)) 7192 return 0; 7193 7194 // Check for bad qualifiers. 7195 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7196 return 0; 7197 7198 DeclContext *LookupContext = computeDeclContext(SS); 7199 NamedDecl *D; 7200 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7201 if (!LookupContext) { 7202 if (HasTypenameKeyword) { 7203 // FIXME: not all declaration name kinds are legal here 7204 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7205 UsingLoc, TypenameLoc, 7206 QualifierLoc, 7207 IdentLoc, NameInfo.getName()); 7208 } else { 7209 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7210 QualifierLoc, NameInfo); 7211 } 7212 } else { 7213 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7214 NameInfo, HasTypenameKeyword); 7215 } 7216 D->setAccess(AS); 7217 CurContext->addDecl(D); 7218 7219 if (!LookupContext) return D; 7220 UsingDecl *UD = cast<UsingDecl>(D); 7221 7222 if (RequireCompleteDeclContext(SS, LookupContext)) { 7223 UD->setInvalidDecl(); 7224 return UD; 7225 } 7226 7227 // The normal rules do not apply to inheriting constructor declarations. 7228 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7229 if (CheckInheritingConstructorUsingDecl(UD)) 7230 UD->setInvalidDecl(); 7231 return UD; 7232 } 7233 7234 // Otherwise, look up the target name. 7235 7236 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7237 7238 // Unlike most lookups, we don't always want to hide tag 7239 // declarations: tag names are visible through the using declaration 7240 // even if hidden by ordinary names, *except* in a dependent context 7241 // where it's important for the sanity of two-phase lookup. 7242 if (!IsInstantiation) 7243 R.setHideTags(false); 7244 7245 // For the purposes of this lookup, we have a base object type 7246 // equal to that of the current context. 7247 if (CurContext->isRecord()) { 7248 R.setBaseObjectType( 7249 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7250 } 7251 7252 LookupQualifiedName(R, LookupContext); 7253 7254 // Try to correct typos if possible. 7255 if (R.empty()) { 7256 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation); 7257 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(), 7258 R.getLookupKind(), S, &SS, CCC)){ 7259 // We reject any correction for which ND would be NULL. 7260 NamedDecl *ND = Corrected.getCorrectionDecl(); 7261 R.setLookupName(Corrected.getCorrection()); 7262 R.addDecl(ND); 7263 // We reject candidates where DroppedSpecifier == true, hence the 7264 // literal '0' below. 7265 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) 7266 << NameInfo.getName() << LookupContext << 0 7267 << SS.getRange()); 7268 } else { 7269 Diag(IdentLoc, diag::err_no_member) 7270 << NameInfo.getName() << LookupContext << SS.getRange(); 7271 UD->setInvalidDecl(); 7272 return UD; 7273 } 7274 } 7275 7276 if (R.isAmbiguous()) { 7277 UD->setInvalidDecl(); 7278 return UD; 7279 } 7280 7281 if (HasTypenameKeyword) { 7282 // If we asked for a typename and got a non-type decl, error out. 7283 if (!R.getAsSingle<TypeDecl>()) { 7284 Diag(IdentLoc, diag::err_using_typename_non_type); 7285 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7286 Diag((*I)->getUnderlyingDecl()->getLocation(), 7287 diag::note_using_decl_target); 7288 UD->setInvalidDecl(); 7289 return UD; 7290 } 7291 } else { 7292 // If we asked for a non-typename and we got a type, error out, 7293 // but only if this is an instantiation of an unresolved using 7294 // decl. Otherwise just silently find the type name. 7295 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7296 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7297 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7298 UD->setInvalidDecl(); 7299 return UD; 7300 } 7301 } 7302 7303 // C++0x N2914 [namespace.udecl]p6: 7304 // A using-declaration shall not name a namespace. 7305 if (R.getAsSingle<NamespaceDecl>()) { 7306 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7307 << SS.getRange(); 7308 UD->setInvalidDecl(); 7309 return UD; 7310 } 7311 7312 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7313 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7314 BuildUsingShadowDecl(S, UD, *I); 7315 } 7316 7317 return UD; 7318} 7319 7320/// Additional checks for a using declaration referring to a constructor name. 7321bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7322 assert(!UD->hasTypename() && "expecting a constructor name"); 7323 7324 const Type *SourceType = UD->getQualifier()->getAsType(); 7325 assert(SourceType && 7326 "Using decl naming constructor doesn't have type in scope spec."); 7327 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7328 7329 // Check whether the named type is a direct base class. 7330 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7331 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7332 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7333 BaseIt != BaseE; ++BaseIt) { 7334 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7335 if (CanonicalSourceType == BaseType) 7336 break; 7337 if (BaseIt->getType()->isDependentType()) 7338 break; 7339 } 7340 7341 if (BaseIt == BaseE) { 7342 // Did not find SourceType in the bases. 7343 Diag(UD->getUsingLoc(), 7344 diag::err_using_decl_constructor_not_in_direct_base) 7345 << UD->getNameInfo().getSourceRange() 7346 << QualType(SourceType, 0) << TargetClass; 7347 return true; 7348 } 7349 7350 if (!CurContext->isDependentContext()) 7351 BaseIt->setInheritConstructors(); 7352 7353 return false; 7354} 7355 7356/// Checks that the given using declaration is not an invalid 7357/// redeclaration. Note that this is checking only for the using decl 7358/// itself, not for any ill-formedness among the UsingShadowDecls. 7359bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7360 bool HasTypenameKeyword, 7361 const CXXScopeSpec &SS, 7362 SourceLocation NameLoc, 7363 const LookupResult &Prev) { 7364 // C++03 [namespace.udecl]p8: 7365 // C++0x [namespace.udecl]p10: 7366 // A using-declaration is a declaration and can therefore be used 7367 // repeatedly where (and only where) multiple declarations are 7368 // allowed. 7369 // 7370 // That's in non-member contexts. 7371 if (!CurContext->getRedeclContext()->isRecord()) 7372 return false; 7373 7374 NestedNameSpecifier *Qual 7375 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7376 7377 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7378 NamedDecl *D = *I; 7379 7380 bool DTypename; 7381 NestedNameSpecifier *DQual; 7382 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7383 DTypename = UD->hasTypename(); 7384 DQual = UD->getQualifier(); 7385 } else if (UnresolvedUsingValueDecl *UD 7386 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7387 DTypename = false; 7388 DQual = UD->getQualifier(); 7389 } else if (UnresolvedUsingTypenameDecl *UD 7390 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7391 DTypename = true; 7392 DQual = UD->getQualifier(); 7393 } else continue; 7394 7395 // using decls differ if one says 'typename' and the other doesn't. 7396 // FIXME: non-dependent using decls? 7397 if (HasTypenameKeyword != DTypename) continue; 7398 7399 // using decls differ if they name different scopes (but note that 7400 // template instantiation can cause this check to trigger when it 7401 // didn't before instantiation). 7402 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7403 Context.getCanonicalNestedNameSpecifier(DQual)) 7404 continue; 7405 7406 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7407 Diag(D->getLocation(), diag::note_using_decl) << 1; 7408 return true; 7409 } 7410 7411 return false; 7412} 7413 7414 7415/// Checks that the given nested-name qualifier used in a using decl 7416/// in the current context is appropriately related to the current 7417/// scope. If an error is found, diagnoses it and returns true. 7418bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7419 const CXXScopeSpec &SS, 7420 SourceLocation NameLoc) { 7421 DeclContext *NamedContext = computeDeclContext(SS); 7422 7423 if (!CurContext->isRecord()) { 7424 // C++03 [namespace.udecl]p3: 7425 // C++0x [namespace.udecl]p8: 7426 // A using-declaration for a class member shall be a member-declaration. 7427 7428 // If we weren't able to compute a valid scope, it must be a 7429 // dependent class scope. 7430 if (!NamedContext || NamedContext->isRecord()) { 7431 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7432 << SS.getRange(); 7433 return true; 7434 } 7435 7436 // Otherwise, everything is known to be fine. 7437 return false; 7438 } 7439 7440 // The current scope is a record. 7441 7442 // If the named context is dependent, we can't decide much. 7443 if (!NamedContext) { 7444 // FIXME: in C++0x, we can diagnose if we can prove that the 7445 // nested-name-specifier does not refer to a base class, which is 7446 // still possible in some cases. 7447 7448 // Otherwise we have to conservatively report that things might be 7449 // okay. 7450 return false; 7451 } 7452 7453 if (!NamedContext->isRecord()) { 7454 // Ideally this would point at the last name in the specifier, 7455 // but we don't have that level of source info. 7456 Diag(SS.getRange().getBegin(), 7457 diag::err_using_decl_nested_name_specifier_is_not_class) 7458 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7459 return true; 7460 } 7461 7462 if (!NamedContext->isDependentContext() && 7463 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7464 return true; 7465 7466 if (getLangOpts().CPlusPlus11) { 7467 // C++0x [namespace.udecl]p3: 7468 // In a using-declaration used as a member-declaration, the 7469 // nested-name-specifier shall name a base class of the class 7470 // being defined. 7471 7472 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7473 cast<CXXRecordDecl>(NamedContext))) { 7474 if (CurContext == NamedContext) { 7475 Diag(NameLoc, 7476 diag::err_using_decl_nested_name_specifier_is_current_class) 7477 << SS.getRange(); 7478 return true; 7479 } 7480 7481 Diag(SS.getRange().getBegin(), 7482 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7483 << (NestedNameSpecifier*) SS.getScopeRep() 7484 << cast<CXXRecordDecl>(CurContext) 7485 << SS.getRange(); 7486 return true; 7487 } 7488 7489 return false; 7490 } 7491 7492 // C++03 [namespace.udecl]p4: 7493 // A using-declaration used as a member-declaration shall refer 7494 // to a member of a base class of the class being defined [etc.]. 7495 7496 // Salient point: SS doesn't have to name a base class as long as 7497 // lookup only finds members from base classes. Therefore we can 7498 // diagnose here only if we can prove that that can't happen, 7499 // i.e. if the class hierarchies provably don't intersect. 7500 7501 // TODO: it would be nice if "definitely valid" results were cached 7502 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7503 // need to be repeated. 7504 7505 struct UserData { 7506 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7507 7508 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7509 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7510 Data->Bases.insert(Base); 7511 return true; 7512 } 7513 7514 bool hasDependentBases(const CXXRecordDecl *Class) { 7515 return !Class->forallBases(collect, this); 7516 } 7517 7518 /// Returns true if the base is dependent or is one of the 7519 /// accumulated base classes. 7520 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7521 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7522 return !Data->Bases.count(Base); 7523 } 7524 7525 bool mightShareBases(const CXXRecordDecl *Class) { 7526 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7527 } 7528 }; 7529 7530 UserData Data; 7531 7532 // Returns false if we find a dependent base. 7533 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7534 return false; 7535 7536 // Returns false if the class has a dependent base or if it or one 7537 // of its bases is present in the base set of the current context. 7538 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7539 return false; 7540 7541 Diag(SS.getRange().getBegin(), 7542 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7543 << (NestedNameSpecifier*) SS.getScopeRep() 7544 << cast<CXXRecordDecl>(CurContext) 7545 << SS.getRange(); 7546 7547 return true; 7548} 7549 7550Decl *Sema::ActOnAliasDeclaration(Scope *S, 7551 AccessSpecifier AS, 7552 MultiTemplateParamsArg TemplateParamLists, 7553 SourceLocation UsingLoc, 7554 UnqualifiedId &Name, 7555 AttributeList *AttrList, 7556 TypeResult Type) { 7557 // Skip up to the relevant declaration scope. 7558 while (S->getFlags() & Scope::TemplateParamScope) 7559 S = S->getParent(); 7560 assert((S->getFlags() & Scope::DeclScope) && 7561 "got alias-declaration outside of declaration scope"); 7562 7563 if (Type.isInvalid()) 7564 return 0; 7565 7566 bool Invalid = false; 7567 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7568 TypeSourceInfo *TInfo = 0; 7569 GetTypeFromParser(Type.get(), &TInfo); 7570 7571 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7572 return 0; 7573 7574 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7575 UPPC_DeclarationType)) { 7576 Invalid = true; 7577 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7578 TInfo->getTypeLoc().getBeginLoc()); 7579 } 7580 7581 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7582 LookupName(Previous, S); 7583 7584 // Warn about shadowing the name of a template parameter. 7585 if (Previous.isSingleResult() && 7586 Previous.getFoundDecl()->isTemplateParameter()) { 7587 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7588 Previous.clear(); 7589 } 7590 7591 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7592 "name in alias declaration must be an identifier"); 7593 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7594 Name.StartLocation, 7595 Name.Identifier, TInfo); 7596 7597 NewTD->setAccess(AS); 7598 7599 if (Invalid) 7600 NewTD->setInvalidDecl(); 7601 7602 ProcessDeclAttributeList(S, NewTD, AttrList); 7603 7604 CheckTypedefForVariablyModifiedType(S, NewTD); 7605 Invalid |= NewTD->isInvalidDecl(); 7606 7607 bool Redeclaration = false; 7608 7609 NamedDecl *NewND; 7610 if (TemplateParamLists.size()) { 7611 TypeAliasTemplateDecl *OldDecl = 0; 7612 TemplateParameterList *OldTemplateParams = 0; 7613 7614 if (TemplateParamLists.size() != 1) { 7615 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7616 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7617 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7618 } 7619 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7620 7621 // Only consider previous declarations in the same scope. 7622 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7623 /*ExplicitInstantiationOrSpecialization*/false); 7624 if (!Previous.empty()) { 7625 Redeclaration = true; 7626 7627 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7628 if (!OldDecl && !Invalid) { 7629 Diag(UsingLoc, diag::err_redefinition_different_kind) 7630 << Name.Identifier; 7631 7632 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7633 if (OldD->getLocation().isValid()) 7634 Diag(OldD->getLocation(), diag::note_previous_definition); 7635 7636 Invalid = true; 7637 } 7638 7639 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7640 if (TemplateParameterListsAreEqual(TemplateParams, 7641 OldDecl->getTemplateParameters(), 7642 /*Complain=*/true, 7643 TPL_TemplateMatch)) 7644 OldTemplateParams = OldDecl->getTemplateParameters(); 7645 else 7646 Invalid = true; 7647 7648 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7649 if (!Invalid && 7650 !Context.hasSameType(OldTD->getUnderlyingType(), 7651 NewTD->getUnderlyingType())) { 7652 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7653 // but we can't reasonably accept it. 7654 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7655 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7656 if (OldTD->getLocation().isValid()) 7657 Diag(OldTD->getLocation(), diag::note_previous_definition); 7658 Invalid = true; 7659 } 7660 } 7661 } 7662 7663 // Merge any previous default template arguments into our parameters, 7664 // and check the parameter list. 7665 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7666 TPC_TypeAliasTemplate)) 7667 return 0; 7668 7669 TypeAliasTemplateDecl *NewDecl = 7670 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7671 Name.Identifier, TemplateParams, 7672 NewTD); 7673 7674 NewDecl->setAccess(AS); 7675 7676 if (Invalid) 7677 NewDecl->setInvalidDecl(); 7678 else if (OldDecl) 7679 NewDecl->setPreviousDeclaration(OldDecl); 7680 7681 NewND = NewDecl; 7682 } else { 7683 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7684 NewND = NewTD; 7685 } 7686 7687 if (!Redeclaration) 7688 PushOnScopeChains(NewND, S); 7689 7690 ActOnDocumentableDecl(NewND); 7691 return NewND; 7692} 7693 7694Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7695 SourceLocation NamespaceLoc, 7696 SourceLocation AliasLoc, 7697 IdentifierInfo *Alias, 7698 CXXScopeSpec &SS, 7699 SourceLocation IdentLoc, 7700 IdentifierInfo *Ident) { 7701 7702 // Lookup the namespace name. 7703 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7704 LookupParsedName(R, S, &SS); 7705 7706 // Check if we have a previous declaration with the same name. 7707 NamedDecl *PrevDecl 7708 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7709 ForRedeclaration); 7710 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7711 PrevDecl = 0; 7712 7713 if (PrevDecl) { 7714 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7715 // We already have an alias with the same name that points to the same 7716 // namespace, so don't create a new one. 7717 // FIXME: At some point, we'll want to create the (redundant) 7718 // declaration to maintain better source information. 7719 if (!R.isAmbiguous() && !R.empty() && 7720 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7721 return 0; 7722 } 7723 7724 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7725 diag::err_redefinition_different_kind; 7726 Diag(AliasLoc, DiagID) << Alias; 7727 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7728 return 0; 7729 } 7730 7731 if (R.isAmbiguous()) 7732 return 0; 7733 7734 if (R.empty()) { 7735 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7736 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7737 return 0; 7738 } 7739 } 7740 7741 NamespaceAliasDecl *AliasDecl = 7742 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7743 Alias, SS.getWithLocInContext(Context), 7744 IdentLoc, R.getFoundDecl()); 7745 7746 PushOnScopeChains(AliasDecl, S); 7747 return AliasDecl; 7748} 7749 7750Sema::ImplicitExceptionSpecification 7751Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7752 CXXMethodDecl *MD) { 7753 CXXRecordDecl *ClassDecl = MD->getParent(); 7754 7755 // C++ [except.spec]p14: 7756 // An implicitly declared special member function (Clause 12) shall have an 7757 // exception-specification. [...] 7758 ImplicitExceptionSpecification ExceptSpec(*this); 7759 if (ClassDecl->isInvalidDecl()) 7760 return ExceptSpec; 7761 7762 // Direct base-class constructors. 7763 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7764 BEnd = ClassDecl->bases_end(); 7765 B != BEnd; ++B) { 7766 if (B->isVirtual()) // Handled below. 7767 continue; 7768 7769 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7770 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7771 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7772 // If this is a deleted function, add it anyway. This might be conformant 7773 // with the standard. This might not. I'm not sure. It might not matter. 7774 if (Constructor) 7775 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7776 } 7777 } 7778 7779 // Virtual base-class constructors. 7780 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7781 BEnd = ClassDecl->vbases_end(); 7782 B != BEnd; ++B) { 7783 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7784 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7785 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7786 // If this is a deleted function, add it anyway. This might be conformant 7787 // with the standard. This might not. I'm not sure. It might not matter. 7788 if (Constructor) 7789 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7790 } 7791 } 7792 7793 // Field constructors. 7794 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7795 FEnd = ClassDecl->field_end(); 7796 F != FEnd; ++F) { 7797 if (F->hasInClassInitializer()) { 7798 if (Expr *E = F->getInClassInitializer()) 7799 ExceptSpec.CalledExpr(E); 7800 else if (!F->isInvalidDecl()) 7801 // DR1351: 7802 // If the brace-or-equal-initializer of a non-static data member 7803 // invokes a defaulted default constructor of its class or of an 7804 // enclosing class in a potentially evaluated subexpression, the 7805 // program is ill-formed. 7806 // 7807 // This resolution is unworkable: the exception specification of the 7808 // default constructor can be needed in an unevaluated context, in 7809 // particular, in the operand of a noexcept-expression, and we can be 7810 // unable to compute an exception specification for an enclosed class. 7811 // 7812 // We do not allow an in-class initializer to require the evaluation 7813 // of the exception specification for any in-class initializer whose 7814 // definition is not lexically complete. 7815 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7816 } else if (const RecordType *RecordTy 7817 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7818 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7819 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7820 // If this is a deleted function, add it anyway. This might be conformant 7821 // with the standard. This might not. I'm not sure. It might not matter. 7822 // In particular, the problem is that this function never gets called. It 7823 // might just be ill-formed because this function attempts to refer to 7824 // a deleted function here. 7825 if (Constructor) 7826 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7827 } 7828 } 7829 7830 return ExceptSpec; 7831} 7832 7833Sema::ImplicitExceptionSpecification 7834Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7835 CXXRecordDecl *ClassDecl = CD->getParent(); 7836 7837 // C++ [except.spec]p14: 7838 // An inheriting constructor [...] shall have an exception-specification. [...] 7839 ImplicitExceptionSpecification ExceptSpec(*this); 7840 if (ClassDecl->isInvalidDecl()) 7841 return ExceptSpec; 7842 7843 // Inherited constructor. 7844 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7845 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7846 // FIXME: Copying or moving the parameters could add extra exceptions to the 7847 // set, as could the default arguments for the inherited constructor. This 7848 // will be addressed when we implement the resolution of core issue 1351. 7849 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7850 7851 // Direct base-class constructors. 7852 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7853 BEnd = ClassDecl->bases_end(); 7854 B != BEnd; ++B) { 7855 if (B->isVirtual()) // Handled below. 7856 continue; 7857 7858 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7859 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7860 if (BaseClassDecl == InheritedDecl) 7861 continue; 7862 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7863 if (Constructor) 7864 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7865 } 7866 } 7867 7868 // Virtual base-class constructors. 7869 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7870 BEnd = ClassDecl->vbases_end(); 7871 B != BEnd; ++B) { 7872 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7873 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7874 if (BaseClassDecl == InheritedDecl) 7875 continue; 7876 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7877 if (Constructor) 7878 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7879 } 7880 } 7881 7882 // Field constructors. 7883 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7884 FEnd = ClassDecl->field_end(); 7885 F != FEnd; ++F) { 7886 if (F->hasInClassInitializer()) { 7887 if (Expr *E = F->getInClassInitializer()) 7888 ExceptSpec.CalledExpr(E); 7889 else if (!F->isInvalidDecl()) 7890 Diag(CD->getLocation(), 7891 diag::err_in_class_initializer_references_def_ctor) << CD; 7892 } else if (const RecordType *RecordTy 7893 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7894 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7895 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7896 if (Constructor) 7897 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7898 } 7899 } 7900 7901 return ExceptSpec; 7902} 7903 7904namespace { 7905/// RAII object to register a special member as being currently declared. 7906struct DeclaringSpecialMember { 7907 Sema &S; 7908 Sema::SpecialMemberDecl D; 7909 bool WasAlreadyBeingDeclared; 7910 7911 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7912 : S(S), D(RD, CSM) { 7913 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7914 if (WasAlreadyBeingDeclared) 7915 // This almost never happens, but if it does, ensure that our cache 7916 // doesn't contain a stale result. 7917 S.SpecialMemberCache.clear(); 7918 7919 // FIXME: Register a note to be produced if we encounter an error while 7920 // declaring the special member. 7921 } 7922 ~DeclaringSpecialMember() { 7923 if (!WasAlreadyBeingDeclared) 7924 S.SpecialMembersBeingDeclared.erase(D); 7925 } 7926 7927 /// \brief Are we already trying to declare this special member? 7928 bool isAlreadyBeingDeclared() const { 7929 return WasAlreadyBeingDeclared; 7930 } 7931}; 7932} 7933 7934CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7935 CXXRecordDecl *ClassDecl) { 7936 // C++ [class.ctor]p5: 7937 // A default constructor for a class X is a constructor of class X 7938 // that can be called without an argument. If there is no 7939 // user-declared constructor for class X, a default constructor is 7940 // implicitly declared. An implicitly-declared default constructor 7941 // is an inline public member of its class. 7942 assert(ClassDecl->needsImplicitDefaultConstructor() && 7943 "Should not build implicit default constructor!"); 7944 7945 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7946 if (DSM.isAlreadyBeingDeclared()) 7947 return 0; 7948 7949 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7950 CXXDefaultConstructor, 7951 false); 7952 7953 // Create the actual constructor declaration. 7954 CanQualType ClassType 7955 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7956 SourceLocation ClassLoc = ClassDecl->getLocation(); 7957 DeclarationName Name 7958 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7959 DeclarationNameInfo NameInfo(Name, ClassLoc); 7960 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7961 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7962 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7963 Constexpr); 7964 DefaultCon->setAccess(AS_public); 7965 DefaultCon->setDefaulted(); 7966 DefaultCon->setImplicit(); 7967 7968 // Build an exception specification pointing back at this constructor. 7969 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, DefaultCon); 7970 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 7971 7972 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7973 // constructors is easy to compute. 7974 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7975 7976 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7977 SetDeclDeleted(DefaultCon, ClassLoc); 7978 7979 // Note that we have declared this constructor. 7980 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7981 7982 if (Scope *S = getScopeForContext(ClassDecl)) 7983 PushOnScopeChains(DefaultCon, S, false); 7984 ClassDecl->addDecl(DefaultCon); 7985 7986 return DefaultCon; 7987} 7988 7989void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7990 CXXConstructorDecl *Constructor) { 7991 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7992 !Constructor->doesThisDeclarationHaveABody() && 7993 !Constructor->isDeleted()) && 7994 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7995 7996 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7997 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7998 7999 SynthesizedFunctionScope Scope(*this, Constructor); 8000 DiagnosticErrorTrap Trap(Diags); 8001 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8002 Trap.hasErrorOccurred()) { 8003 Diag(CurrentLocation, diag::note_member_synthesized_at) 8004 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 8005 Constructor->setInvalidDecl(); 8006 return; 8007 } 8008 8009 SourceLocation Loc = Constructor->getLocation(); 8010 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8011 8012 Constructor->markUsed(Context); 8013 MarkVTableUsed(CurrentLocation, ClassDecl); 8014 8015 if (ASTMutationListener *L = getASTMutationListener()) { 8016 L->CompletedImplicitDefinition(Constructor); 8017 } 8018} 8019 8020void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 8021 // Check that any explicitly-defaulted methods have exception specifications 8022 // compatible with their implicit exception specifications. 8023 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 8024} 8025 8026namespace { 8027/// Information on inheriting constructors to declare. 8028class InheritingConstructorInfo { 8029public: 8030 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 8031 : SemaRef(SemaRef), Derived(Derived) { 8032 // Mark the constructors that we already have in the derived class. 8033 // 8034 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 8035 // unless there is a user-declared constructor with the same signature in 8036 // the class where the using-declaration appears. 8037 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 8038 } 8039 8040 void inheritAll(CXXRecordDecl *RD) { 8041 visitAll(RD, &InheritingConstructorInfo::inherit); 8042 } 8043 8044private: 8045 /// Information about an inheriting constructor. 8046 struct InheritingConstructor { 8047 InheritingConstructor() 8048 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 8049 8050 /// If \c true, a constructor with this signature is already declared 8051 /// in the derived class. 8052 bool DeclaredInDerived; 8053 8054 /// The constructor which is inherited. 8055 const CXXConstructorDecl *BaseCtor; 8056 8057 /// The derived constructor we declared. 8058 CXXConstructorDecl *DerivedCtor; 8059 }; 8060 8061 /// Inheriting constructors with a given canonical type. There can be at 8062 /// most one such non-template constructor, and any number of templated 8063 /// constructors. 8064 struct InheritingConstructorsForType { 8065 InheritingConstructor NonTemplate; 8066 SmallVector<std::pair<TemplateParameterList *, InheritingConstructor>, 4> 8067 Templates; 8068 8069 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 8070 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 8071 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 8072 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 8073 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 8074 false, S.TPL_TemplateMatch)) 8075 return Templates[I].second; 8076 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 8077 return Templates.back().second; 8078 } 8079 8080 return NonTemplate; 8081 } 8082 }; 8083 8084 /// Get or create the inheriting constructor record for a constructor. 8085 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 8086 QualType CtorType) { 8087 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 8088 .getEntry(SemaRef, Ctor); 8089 } 8090 8091 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 8092 8093 /// Process all constructors for a class. 8094 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 8095 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 8096 CtorE = RD->ctor_end(); 8097 CtorIt != CtorE; ++CtorIt) 8098 (this->*Callback)(*CtorIt); 8099 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 8100 I(RD->decls_begin()), E(RD->decls_end()); 8101 I != E; ++I) { 8102 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 8103 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 8104 (this->*Callback)(CD); 8105 } 8106 } 8107 8108 /// Note that a constructor (or constructor template) was declared in Derived. 8109 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 8110 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 8111 } 8112 8113 /// Inherit a single constructor. 8114 void inherit(const CXXConstructorDecl *Ctor) { 8115 const FunctionProtoType *CtorType = 8116 Ctor->getType()->castAs<FunctionProtoType>(); 8117 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 8118 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 8119 8120 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 8121 8122 // Core issue (no number yet): the ellipsis is always discarded. 8123 if (EPI.Variadic) { 8124 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 8125 SemaRef.Diag(Ctor->getLocation(), 8126 diag::note_using_decl_constructor_ellipsis); 8127 EPI.Variadic = false; 8128 } 8129 8130 // Declare a constructor for each number of parameters. 8131 // 8132 // C++11 [class.inhctor]p1: 8133 // The candidate set of inherited constructors from the class X named in 8134 // the using-declaration consists of [... modulo defects ...] for each 8135 // constructor or constructor template of X, the set of constructors or 8136 // constructor templates that results from omitting any ellipsis parameter 8137 // specification and successively omitting parameters with a default 8138 // argument from the end of the parameter-type-list 8139 unsigned MinParams = minParamsToInherit(Ctor); 8140 unsigned Params = Ctor->getNumParams(); 8141 if (Params >= MinParams) { 8142 do 8143 declareCtor(UsingLoc, Ctor, 8144 SemaRef.Context.getFunctionType( 8145 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 8146 while (Params > MinParams && 8147 Ctor->getParamDecl(--Params)->hasDefaultArg()); 8148 } 8149 } 8150 8151 /// Find the using-declaration which specified that we should inherit the 8152 /// constructors of \p Base. 8153 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 8154 // No fancy lookup required; just look for the base constructor name 8155 // directly within the derived class. 8156 ASTContext &Context = SemaRef.Context; 8157 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8158 Context.getCanonicalType(Context.getRecordType(Base))); 8159 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8160 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8161 } 8162 8163 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8164 // C++11 [class.inhctor]p3: 8165 // [F]or each constructor template in the candidate set of inherited 8166 // constructors, a constructor template is implicitly declared 8167 if (Ctor->getDescribedFunctionTemplate()) 8168 return 0; 8169 8170 // For each non-template constructor in the candidate set of inherited 8171 // constructors other than a constructor having no parameters or a 8172 // copy/move constructor having a single parameter, a constructor is 8173 // implicitly declared [...] 8174 if (Ctor->getNumParams() == 0) 8175 return 1; 8176 if (Ctor->isCopyOrMoveConstructor()) 8177 return 2; 8178 8179 // Per discussion on core reflector, never inherit a constructor which 8180 // would become a default, copy, or move constructor of Derived either. 8181 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8182 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8183 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8184 } 8185 8186 /// Declare a single inheriting constructor, inheriting the specified 8187 /// constructor, with the given type. 8188 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8189 QualType DerivedType) { 8190 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8191 8192 // C++11 [class.inhctor]p3: 8193 // ... a constructor is implicitly declared with the same constructor 8194 // characteristics unless there is a user-declared constructor with 8195 // the same signature in the class where the using-declaration appears 8196 if (Entry.DeclaredInDerived) 8197 return; 8198 8199 // C++11 [class.inhctor]p7: 8200 // If two using-declarations declare inheriting constructors with the 8201 // same signature, the program is ill-formed 8202 if (Entry.DerivedCtor) { 8203 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8204 // Only diagnose this once per constructor. 8205 if (Entry.DerivedCtor->isInvalidDecl()) 8206 return; 8207 Entry.DerivedCtor->setInvalidDecl(); 8208 8209 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8210 SemaRef.Diag(BaseCtor->getLocation(), 8211 diag::note_using_decl_constructor_conflict_current_ctor); 8212 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8213 diag::note_using_decl_constructor_conflict_previous_ctor); 8214 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8215 diag::note_using_decl_constructor_conflict_previous_using); 8216 } else { 8217 // Core issue (no number): if the same inheriting constructor is 8218 // produced by multiple base class constructors from the same base 8219 // class, the inheriting constructor is defined as deleted. 8220 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8221 } 8222 8223 return; 8224 } 8225 8226 ASTContext &Context = SemaRef.Context; 8227 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8228 Context.getCanonicalType(Context.getRecordType(Derived))); 8229 DeclarationNameInfo NameInfo(Name, UsingLoc); 8230 8231 TemplateParameterList *TemplateParams = 0; 8232 if (const FunctionTemplateDecl *FTD = 8233 BaseCtor->getDescribedFunctionTemplate()) { 8234 TemplateParams = FTD->getTemplateParameters(); 8235 // We're reusing template parameters from a different DeclContext. This 8236 // is questionable at best, but works out because the template depth in 8237 // both places is guaranteed to be 0. 8238 // FIXME: Rebuild the template parameters in the new context, and 8239 // transform the function type to refer to them. 8240 } 8241 8242 // Build type source info pointing at the using-declaration. This is 8243 // required by template instantiation. 8244 TypeSourceInfo *TInfo = 8245 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8246 FunctionProtoTypeLoc ProtoLoc = 8247 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8248 8249 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8250 Context, Derived, UsingLoc, NameInfo, DerivedType, 8251 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8252 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8253 8254 // Build an unevaluated exception specification for this constructor. 8255 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8256 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8257 EPI.ExceptionSpecType = EST_Unevaluated; 8258 EPI.ExceptionSpecDecl = DerivedCtor; 8259 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8260 FPT->getArgTypes(), EPI)); 8261 8262 // Build the parameter declarations. 8263 SmallVector<ParmVarDecl *, 16> ParamDecls; 8264 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8265 TypeSourceInfo *TInfo = 8266 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8267 ParmVarDecl *PD = ParmVarDecl::Create( 8268 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8269 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8270 PD->setScopeInfo(0, I); 8271 PD->setImplicit(); 8272 ParamDecls.push_back(PD); 8273 ProtoLoc.setArg(I, PD); 8274 } 8275 8276 // Set up the new constructor. 8277 DerivedCtor->setAccess(BaseCtor->getAccess()); 8278 DerivedCtor->setParams(ParamDecls); 8279 DerivedCtor->setInheritedConstructor(BaseCtor); 8280 if (BaseCtor->isDeleted()) 8281 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8282 8283 // If this is a constructor template, build the template declaration. 8284 if (TemplateParams) { 8285 FunctionTemplateDecl *DerivedTemplate = 8286 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8287 TemplateParams, DerivedCtor); 8288 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8289 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8290 Derived->addDecl(DerivedTemplate); 8291 } else { 8292 Derived->addDecl(DerivedCtor); 8293 } 8294 8295 Entry.BaseCtor = BaseCtor; 8296 Entry.DerivedCtor = DerivedCtor; 8297 } 8298 8299 Sema &SemaRef; 8300 CXXRecordDecl *Derived; 8301 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8302 MapType Map; 8303}; 8304} 8305 8306void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8307 // Defer declaring the inheriting constructors until the class is 8308 // instantiated. 8309 if (ClassDecl->isDependentContext()) 8310 return; 8311 8312 // Find base classes from which we might inherit constructors. 8313 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8314 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8315 BaseE = ClassDecl->bases_end(); 8316 BaseIt != BaseE; ++BaseIt) 8317 if (BaseIt->getInheritConstructors()) 8318 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8319 8320 // Go no further if we're not inheriting any constructors. 8321 if (InheritedBases.empty()) 8322 return; 8323 8324 // Declare the inherited constructors. 8325 InheritingConstructorInfo ICI(*this, ClassDecl); 8326 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8327 ICI.inheritAll(InheritedBases[I]); 8328} 8329 8330void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8331 CXXConstructorDecl *Constructor) { 8332 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8333 assert(Constructor->getInheritedConstructor() && 8334 !Constructor->doesThisDeclarationHaveABody() && 8335 !Constructor->isDeleted()); 8336 8337 SynthesizedFunctionScope Scope(*this, Constructor); 8338 DiagnosticErrorTrap Trap(Diags); 8339 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8340 Trap.hasErrorOccurred()) { 8341 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8342 << Context.getTagDeclType(ClassDecl); 8343 Constructor->setInvalidDecl(); 8344 return; 8345 } 8346 8347 SourceLocation Loc = Constructor->getLocation(); 8348 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8349 8350 Constructor->markUsed(Context); 8351 MarkVTableUsed(CurrentLocation, ClassDecl); 8352 8353 if (ASTMutationListener *L = getASTMutationListener()) { 8354 L->CompletedImplicitDefinition(Constructor); 8355 } 8356} 8357 8358 8359Sema::ImplicitExceptionSpecification 8360Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8361 CXXRecordDecl *ClassDecl = MD->getParent(); 8362 8363 // C++ [except.spec]p14: 8364 // An implicitly declared special member function (Clause 12) shall have 8365 // an exception-specification. 8366 ImplicitExceptionSpecification ExceptSpec(*this); 8367 if (ClassDecl->isInvalidDecl()) 8368 return ExceptSpec; 8369 8370 // Direct base-class destructors. 8371 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8372 BEnd = ClassDecl->bases_end(); 8373 B != BEnd; ++B) { 8374 if (B->isVirtual()) // Handled below. 8375 continue; 8376 8377 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8378 ExceptSpec.CalledDecl(B->getLocStart(), 8379 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8380 } 8381 8382 // Virtual base-class destructors. 8383 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8384 BEnd = ClassDecl->vbases_end(); 8385 B != BEnd; ++B) { 8386 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8387 ExceptSpec.CalledDecl(B->getLocStart(), 8388 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8389 } 8390 8391 // Field destructors. 8392 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8393 FEnd = ClassDecl->field_end(); 8394 F != FEnd; ++F) { 8395 if (const RecordType *RecordTy 8396 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8397 ExceptSpec.CalledDecl(F->getLocation(), 8398 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8399 } 8400 8401 return ExceptSpec; 8402} 8403 8404CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8405 // C++ [class.dtor]p2: 8406 // If a class has no user-declared destructor, a destructor is 8407 // declared implicitly. An implicitly-declared destructor is an 8408 // inline public member of its class. 8409 assert(ClassDecl->needsImplicitDestructor()); 8410 8411 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8412 if (DSM.isAlreadyBeingDeclared()) 8413 return 0; 8414 8415 // Create the actual destructor declaration. 8416 CanQualType ClassType 8417 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8418 SourceLocation ClassLoc = ClassDecl->getLocation(); 8419 DeclarationName Name 8420 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8421 DeclarationNameInfo NameInfo(Name, ClassLoc); 8422 CXXDestructorDecl *Destructor 8423 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8424 QualType(), 0, /*isInline=*/true, 8425 /*isImplicitlyDeclared=*/true); 8426 Destructor->setAccess(AS_public); 8427 Destructor->setDefaulted(); 8428 Destructor->setImplicit(); 8429 8430 // Build an exception specification pointing back at this destructor. 8431 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, Destructor); 8432 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8433 8434 AddOverriddenMethods(ClassDecl, Destructor); 8435 8436 // We don't need to use SpecialMemberIsTrivial here; triviality for 8437 // destructors is easy to compute. 8438 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8439 8440 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8441 SetDeclDeleted(Destructor, ClassLoc); 8442 8443 // Note that we have declared this destructor. 8444 ++ASTContext::NumImplicitDestructorsDeclared; 8445 8446 // Introduce this destructor into its scope. 8447 if (Scope *S = getScopeForContext(ClassDecl)) 8448 PushOnScopeChains(Destructor, S, false); 8449 ClassDecl->addDecl(Destructor); 8450 8451 return Destructor; 8452} 8453 8454void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8455 CXXDestructorDecl *Destructor) { 8456 assert((Destructor->isDefaulted() && 8457 !Destructor->doesThisDeclarationHaveABody() && 8458 !Destructor->isDeleted()) && 8459 "DefineImplicitDestructor - call it for implicit default dtor"); 8460 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8461 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8462 8463 if (Destructor->isInvalidDecl()) 8464 return; 8465 8466 SynthesizedFunctionScope Scope(*this, Destructor); 8467 8468 DiagnosticErrorTrap Trap(Diags); 8469 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8470 Destructor->getParent()); 8471 8472 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8473 Diag(CurrentLocation, diag::note_member_synthesized_at) 8474 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8475 8476 Destructor->setInvalidDecl(); 8477 return; 8478 } 8479 8480 SourceLocation Loc = Destructor->getLocation(); 8481 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8482 Destructor->markUsed(Context); 8483 MarkVTableUsed(CurrentLocation, ClassDecl); 8484 8485 if (ASTMutationListener *L = getASTMutationListener()) { 8486 L->CompletedImplicitDefinition(Destructor); 8487 } 8488} 8489 8490/// \brief Perform any semantic analysis which needs to be delayed until all 8491/// pending class member declarations have been parsed. 8492void Sema::ActOnFinishCXXMemberDecls() { 8493 // If the context is an invalid C++ class, just suppress these checks. 8494 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8495 if (Record->isInvalidDecl()) { 8496 DelayedDestructorExceptionSpecChecks.clear(); 8497 return; 8498 } 8499 } 8500 8501 // Perform any deferred checking of exception specifications for virtual 8502 // destructors. 8503 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8504 i != e; ++i) { 8505 const CXXDestructorDecl *Dtor = 8506 DelayedDestructorExceptionSpecChecks[i].first; 8507 assert(!Dtor->getParent()->isDependentType() && 8508 "Should not ever add destructors of templates into the list."); 8509 CheckOverridingFunctionExceptionSpec(Dtor, 8510 DelayedDestructorExceptionSpecChecks[i].second); 8511 } 8512 DelayedDestructorExceptionSpecChecks.clear(); 8513} 8514 8515void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8516 CXXDestructorDecl *Destructor) { 8517 assert(getLangOpts().CPlusPlus11 && 8518 "adjusting dtor exception specs was introduced in c++11"); 8519 8520 // C++11 [class.dtor]p3: 8521 // A declaration of a destructor that does not have an exception- 8522 // specification is implicitly considered to have the same exception- 8523 // specification as an implicit declaration. 8524 const FunctionProtoType *DtorType = Destructor->getType()-> 8525 getAs<FunctionProtoType>(); 8526 if (DtorType->hasExceptionSpec()) 8527 return; 8528 8529 // Replace the destructor's type, building off the existing one. Fortunately, 8530 // the only thing of interest in the destructor type is its extended info. 8531 // The return and arguments are fixed. 8532 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8533 EPI.ExceptionSpecType = EST_Unevaluated; 8534 EPI.ExceptionSpecDecl = Destructor; 8535 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8536 8537 // FIXME: If the destructor has a body that could throw, and the newly created 8538 // spec doesn't allow exceptions, we should emit a warning, because this 8539 // change in behavior can break conforming C++03 programs at runtime. 8540 // However, we don't have a body or an exception specification yet, so it 8541 // needs to be done somewhere else. 8542} 8543 8544namespace { 8545/// \brief An abstract base class for all helper classes used in building the 8546// copy/move operators. These classes serve as factory functions and help us 8547// avoid using the same Expr* in the AST twice. 8548class ExprBuilder { 8549 ExprBuilder(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8550 ExprBuilder &operator=(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8551 8552protected: 8553 static Expr *assertNotNull(Expr *E) { 8554 assert(E && "Expression construction must not fail."); 8555 return E; 8556 } 8557 8558public: 8559 ExprBuilder() {} 8560 virtual ~ExprBuilder() {} 8561 8562 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; 8563}; 8564 8565class RefBuilder: public ExprBuilder { 8566 VarDecl *Var; 8567 QualType VarType; 8568 8569public: 8570 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8571 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).take()); 8572 } 8573 8574 RefBuilder(VarDecl *Var, QualType VarType) 8575 : Var(Var), VarType(VarType) {} 8576}; 8577 8578class ThisBuilder: public ExprBuilder { 8579public: 8580 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8581 return assertNotNull(S.ActOnCXXThis(Loc).takeAs<Expr>()); 8582 } 8583}; 8584 8585class CastBuilder: public ExprBuilder { 8586 const ExprBuilder &Builder; 8587 QualType Type; 8588 ExprValueKind Kind; 8589 const CXXCastPath &Path; 8590 8591public: 8592 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8593 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, 8594 CK_UncheckedDerivedToBase, Kind, 8595 &Path).take()); 8596 } 8597 8598 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, 8599 const CXXCastPath &Path) 8600 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} 8601}; 8602 8603class DerefBuilder: public ExprBuilder { 8604 const ExprBuilder &Builder; 8605 8606public: 8607 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8608 return assertNotNull( 8609 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).take()); 8610 } 8611 8612 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8613}; 8614 8615class MemberBuilder: public ExprBuilder { 8616 const ExprBuilder &Builder; 8617 QualType Type; 8618 CXXScopeSpec SS; 8619 bool IsArrow; 8620 LookupResult &MemberLookup; 8621 8622public: 8623 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8624 return assertNotNull(S.BuildMemberReferenceExpr( 8625 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), 0, 8626 MemberLookup, 0).take()); 8627 } 8628 8629 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, 8630 LookupResult &MemberLookup) 8631 : Builder(Builder), Type(Type), IsArrow(IsArrow), 8632 MemberLookup(MemberLookup) {} 8633}; 8634 8635class MoveCastBuilder: public ExprBuilder { 8636 const ExprBuilder &Builder; 8637 8638public: 8639 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8640 return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); 8641 } 8642 8643 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8644}; 8645 8646class LvalueConvBuilder: public ExprBuilder { 8647 const ExprBuilder &Builder; 8648 8649public: 8650 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8651 return assertNotNull( 8652 S.DefaultLvalueConversion(Builder.build(S, Loc)).take()); 8653 } 8654 8655 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8656}; 8657 8658class SubscriptBuilder: public ExprBuilder { 8659 const ExprBuilder &Base; 8660 const ExprBuilder &Index; 8661 8662public: 8663 virtual Expr *build(Sema &S, SourceLocation Loc) const 8664 LLVM_OVERRIDE { 8665 return assertNotNull(S.CreateBuiltinArraySubscriptExpr( 8666 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).take()); 8667 } 8668 8669 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) 8670 : Base(Base), Index(Index) {} 8671}; 8672 8673} // end anonymous namespace 8674 8675/// When generating a defaulted copy or move assignment operator, if a field 8676/// should be copied with __builtin_memcpy rather than via explicit assignments, 8677/// do so. This optimization only applies for arrays of scalars, and for arrays 8678/// of class type where the selected copy/move-assignment operator is trivial. 8679static StmtResult 8680buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8681 const ExprBuilder &ToB, const ExprBuilder &FromB) { 8682 // Compute the size of the memory buffer to be copied. 8683 QualType SizeType = S.Context.getSizeType(); 8684 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8685 S.Context.getTypeSizeInChars(T).getQuantity()); 8686 8687 // Take the address of the field references for "from" and "to". We 8688 // directly construct UnaryOperators here because semantic analysis 8689 // does not permit us to take the address of an xvalue. 8690 Expr *From = FromB.build(S, Loc); 8691 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8692 S.Context.getPointerType(From->getType()), 8693 VK_RValue, OK_Ordinary, Loc); 8694 Expr *To = ToB.build(S, Loc); 8695 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8696 S.Context.getPointerType(To->getType()), 8697 VK_RValue, OK_Ordinary, Loc); 8698 8699 const Type *E = T->getBaseElementTypeUnsafe(); 8700 bool NeedsCollectableMemCpy = 8701 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8702 8703 // Create a reference to the __builtin_objc_memmove_collectable function 8704 StringRef MemCpyName = NeedsCollectableMemCpy ? 8705 "__builtin_objc_memmove_collectable" : 8706 "__builtin_memcpy"; 8707 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8708 Sema::LookupOrdinaryName); 8709 S.LookupName(R, S.TUScope, true); 8710 8711 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8712 if (!MemCpy) 8713 // Something went horribly wrong earlier, and we will have complained 8714 // about it. 8715 return StmtError(); 8716 8717 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8718 VK_RValue, Loc, 0); 8719 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8720 8721 Expr *CallArgs[] = { 8722 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8723 }; 8724 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8725 Loc, CallArgs, Loc); 8726 8727 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8728 return S.Owned(Call.takeAs<Stmt>()); 8729} 8730 8731/// \brief Builds a statement that copies/moves the given entity from \p From to 8732/// \c To. 8733/// 8734/// This routine is used to copy/move the members of a class with an 8735/// implicitly-declared copy/move assignment operator. When the entities being 8736/// copied are arrays, this routine builds for loops to copy them. 8737/// 8738/// \param S The Sema object used for type-checking. 8739/// 8740/// \param Loc The location where the implicit copy/move is being generated. 8741/// 8742/// \param T The type of the expressions being copied/moved. Both expressions 8743/// must have this type. 8744/// 8745/// \param To The expression we are copying/moving to. 8746/// 8747/// \param From The expression we are copying/moving from. 8748/// 8749/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8750/// Otherwise, it's a non-static member subobject. 8751/// 8752/// \param Copying Whether we're copying or moving. 8753/// 8754/// \param Depth Internal parameter recording the depth of the recursion. 8755/// 8756/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8757/// if a memcpy should be used instead. 8758static StmtResult 8759buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8760 const ExprBuilder &To, const ExprBuilder &From, 8761 bool CopyingBaseSubobject, bool Copying, 8762 unsigned Depth = 0) { 8763 // C++11 [class.copy]p28: 8764 // Each subobject is assigned in the manner appropriate to its type: 8765 // 8766 // - if the subobject is of class type, as if by a call to operator= with 8767 // the subobject as the object expression and the corresponding 8768 // subobject of x as a single function argument (as if by explicit 8769 // qualification; that is, ignoring any possible virtual overriding 8770 // functions in more derived classes); 8771 // 8772 // C++03 [class.copy]p13: 8773 // - if the subobject is of class type, the copy assignment operator for 8774 // the class is used (as if by explicit qualification; that is, 8775 // ignoring any possible virtual overriding functions in more derived 8776 // classes); 8777 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8778 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8779 8780 // Look for operator=. 8781 DeclarationName Name 8782 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8783 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8784 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8785 8786 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8787 // operator. 8788 if (!S.getLangOpts().CPlusPlus11) { 8789 LookupResult::Filter F = OpLookup.makeFilter(); 8790 while (F.hasNext()) { 8791 NamedDecl *D = F.next(); 8792 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8793 if (Method->isCopyAssignmentOperator() || 8794 (!Copying && Method->isMoveAssignmentOperator())) 8795 continue; 8796 8797 F.erase(); 8798 } 8799 F.done(); 8800 } 8801 8802 // Suppress the protected check (C++ [class.protected]) for each of the 8803 // assignment operators we found. This strange dance is required when 8804 // we're assigning via a base classes's copy-assignment operator. To 8805 // ensure that we're getting the right base class subobject (without 8806 // ambiguities), we need to cast "this" to that subobject type; to 8807 // ensure that we don't go through the virtual call mechanism, we need 8808 // to qualify the operator= name with the base class (see below). However, 8809 // this means that if the base class has a protected copy assignment 8810 // operator, the protected member access check will fail. So, we 8811 // rewrite "protected" access to "public" access in this case, since we 8812 // know by construction that we're calling from a derived class. 8813 if (CopyingBaseSubobject) { 8814 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8815 L != LEnd; ++L) { 8816 if (L.getAccess() == AS_protected) 8817 L.setAccess(AS_public); 8818 } 8819 } 8820 8821 // Create the nested-name-specifier that will be used to qualify the 8822 // reference to operator=; this is required to suppress the virtual 8823 // call mechanism. 8824 CXXScopeSpec SS; 8825 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8826 SS.MakeTrivial(S.Context, 8827 NestedNameSpecifier::Create(S.Context, 0, false, 8828 CanonicalT), 8829 Loc); 8830 8831 // Create the reference to operator=. 8832 ExprResult OpEqualRef 8833 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false, 8834 SS, /*TemplateKWLoc=*/SourceLocation(), 8835 /*FirstQualifierInScope=*/0, 8836 OpLookup, 8837 /*TemplateArgs=*/0, 8838 /*SuppressQualifierCheck=*/true); 8839 if (OpEqualRef.isInvalid()) 8840 return StmtError(); 8841 8842 // Build the call to the assignment operator. 8843 8844 Expr *FromInst = From.build(S, Loc); 8845 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8846 OpEqualRef.takeAs<Expr>(), 8847 Loc, FromInst, Loc); 8848 if (Call.isInvalid()) 8849 return StmtError(); 8850 8851 // If we built a call to a trivial 'operator=' while copying an array, 8852 // bail out. We'll replace the whole shebang with a memcpy. 8853 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8854 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8855 return StmtResult((Stmt*)0); 8856 8857 // Convert to an expression-statement, and clean up any produced 8858 // temporaries. 8859 return S.ActOnExprStmt(Call); 8860 } 8861 8862 // - if the subobject is of scalar type, the built-in assignment 8863 // operator is used. 8864 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8865 if (!ArrayTy) { 8866 ExprResult Assignment = S.CreateBuiltinBinOp( 8867 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); 8868 if (Assignment.isInvalid()) 8869 return StmtError(); 8870 return S.ActOnExprStmt(Assignment); 8871 } 8872 8873 // - if the subobject is an array, each element is assigned, in the 8874 // manner appropriate to the element type; 8875 8876 // Construct a loop over the array bounds, e.g., 8877 // 8878 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8879 // 8880 // that will copy each of the array elements. 8881 QualType SizeType = S.Context.getSizeType(); 8882 8883 // Create the iteration variable. 8884 IdentifierInfo *IterationVarName = 0; 8885 { 8886 SmallString<8> Str; 8887 llvm::raw_svector_ostream OS(Str); 8888 OS << "__i" << Depth; 8889 IterationVarName = &S.Context.Idents.get(OS.str()); 8890 } 8891 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8892 IterationVarName, SizeType, 8893 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8894 SC_None); 8895 8896 // Initialize the iteration variable to zero. 8897 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8898 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8899 8900 // Creates a reference to the iteration variable. 8901 RefBuilder IterationVarRef(IterationVar, SizeType); 8902 LvalueConvBuilder IterationVarRefRVal(IterationVarRef); 8903 8904 // Create the DeclStmt that holds the iteration variable. 8905 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8906 8907 // Subscript the "from" and "to" expressions with the iteration variable. 8908 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); 8909 MoveCastBuilder FromIndexMove(FromIndexCopy); 8910 const ExprBuilder *FromIndex; 8911 if (Copying) 8912 FromIndex = &FromIndexCopy; 8913 else 8914 FromIndex = &FromIndexMove; 8915 8916 SubscriptBuilder ToIndex(To, IterationVarRefRVal); 8917 8918 // Build the copy/move for an individual element of the array. 8919 StmtResult Copy = 8920 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8921 ToIndex, *FromIndex, CopyingBaseSubobject, 8922 Copying, Depth + 1); 8923 // Bail out if copying fails or if we determined that we should use memcpy. 8924 if (Copy.isInvalid() || !Copy.get()) 8925 return Copy; 8926 8927 // Create the comparison against the array bound. 8928 llvm::APInt Upper 8929 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8930 Expr *Comparison 8931 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc), 8932 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8933 BO_NE, S.Context.BoolTy, 8934 VK_RValue, OK_Ordinary, Loc, false); 8935 8936 // Create the pre-increment of the iteration variable. 8937 Expr *Increment 8938 = new (S.Context) UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, 8939 SizeType, VK_LValue, OK_Ordinary, Loc); 8940 8941 // Construct the loop that copies all elements of this array. 8942 return S.ActOnForStmt(Loc, Loc, InitStmt, 8943 S.MakeFullExpr(Comparison), 8944 0, S.MakeFullDiscardedValueExpr(Increment), 8945 Loc, Copy.take()); 8946} 8947 8948static StmtResult 8949buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8950 const ExprBuilder &To, const ExprBuilder &From, 8951 bool CopyingBaseSubobject, bool Copying) { 8952 // Maybe we should use a memcpy? 8953 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8954 T.isTriviallyCopyableType(S.Context)) 8955 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8956 8957 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8958 CopyingBaseSubobject, 8959 Copying, 0)); 8960 8961 // If we ended up picking a trivial assignment operator for an array of a 8962 // non-trivially-copyable class type, just emit a memcpy. 8963 if (!Result.isInvalid() && !Result.get()) 8964 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8965 8966 return Result; 8967} 8968 8969Sema::ImplicitExceptionSpecification 8970Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8971 CXXRecordDecl *ClassDecl = MD->getParent(); 8972 8973 ImplicitExceptionSpecification ExceptSpec(*this); 8974 if (ClassDecl->isInvalidDecl()) 8975 return ExceptSpec; 8976 8977 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8978 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8979 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8980 8981 // C++ [except.spec]p14: 8982 // An implicitly declared special member function (Clause 12) shall have an 8983 // exception-specification. [...] 8984 8985 // It is unspecified whether or not an implicit copy assignment operator 8986 // attempts to deduplicate calls to assignment operators of virtual bases are 8987 // made. As such, this exception specification is effectively unspecified. 8988 // Based on a similar decision made for constness in C++0x, we're erring on 8989 // the side of assuming such calls to be made regardless of whether they 8990 // actually happen. 8991 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8992 BaseEnd = ClassDecl->bases_end(); 8993 Base != BaseEnd; ++Base) { 8994 if (Base->isVirtual()) 8995 continue; 8996 8997 CXXRecordDecl *BaseClassDecl 8998 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8999 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9000 ArgQuals, false, 0)) 9001 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9002 } 9003 9004 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9005 BaseEnd = ClassDecl->vbases_end(); 9006 Base != BaseEnd; ++Base) { 9007 CXXRecordDecl *BaseClassDecl 9008 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9009 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9010 ArgQuals, false, 0)) 9011 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9012 } 9013 9014 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9015 FieldEnd = ClassDecl->field_end(); 9016 Field != FieldEnd; 9017 ++Field) { 9018 QualType FieldType = Context.getBaseElementType(Field->getType()); 9019 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9020 if (CXXMethodDecl *CopyAssign = 9021 LookupCopyingAssignment(FieldClassDecl, 9022 ArgQuals | FieldType.getCVRQualifiers(), 9023 false, 0)) 9024 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 9025 } 9026 } 9027 9028 return ExceptSpec; 9029} 9030 9031CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 9032 // Note: The following rules are largely analoguous to the copy 9033 // constructor rules. Note that virtual bases are not taken into account 9034 // for determining the argument type of the operator. Note also that 9035 // operators taking an object instead of a reference are allowed. 9036 assert(ClassDecl->needsImplicitCopyAssignment()); 9037 9038 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 9039 if (DSM.isAlreadyBeingDeclared()) 9040 return 0; 9041 9042 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9043 QualType RetType = Context.getLValueReferenceType(ArgType); 9044 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 9045 if (Const) 9046 ArgType = ArgType.withConst(); 9047 ArgType = Context.getLValueReferenceType(ArgType); 9048 9049 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9050 CXXCopyAssignment, 9051 Const); 9052 9053 // An implicitly-declared copy assignment operator is an inline public 9054 // member of its class. 9055 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9056 SourceLocation ClassLoc = ClassDecl->getLocation(); 9057 DeclarationNameInfo NameInfo(Name, ClassLoc); 9058 CXXMethodDecl *CopyAssignment = 9059 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9060 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 9061 /*isInline=*/ true, Constexpr, SourceLocation()); 9062 CopyAssignment->setAccess(AS_public); 9063 CopyAssignment->setDefaulted(); 9064 CopyAssignment->setImplicit(); 9065 9066 // Build an exception specification pointing back at this member. 9067 FunctionProtoType::ExtProtoInfo EPI = 9068 getImplicitMethodEPI(*this, CopyAssignment); 9069 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9070 9071 // Add the parameter to the operator. 9072 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 9073 ClassLoc, ClassLoc, /*Id=*/0, 9074 ArgType, /*TInfo=*/0, 9075 SC_None, 0); 9076 CopyAssignment->setParams(FromParam); 9077 9078 AddOverriddenMethods(ClassDecl, CopyAssignment); 9079 9080 CopyAssignment->setTrivial( 9081 ClassDecl->needsOverloadResolutionForCopyAssignment() 9082 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 9083 : ClassDecl->hasTrivialCopyAssignment()); 9084 9085 // C++11 [class.copy]p19: 9086 // .... If the class definition does not explicitly declare a copy 9087 // assignment operator, there is no user-declared move constructor, and 9088 // there is no user-declared move assignment operator, a copy assignment 9089 // operator is implicitly declared as defaulted. 9090 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 9091 SetDeclDeleted(CopyAssignment, ClassLoc); 9092 9093 // Note that we have added this copy-assignment operator. 9094 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 9095 9096 if (Scope *S = getScopeForContext(ClassDecl)) 9097 PushOnScopeChains(CopyAssignment, S, false); 9098 ClassDecl->addDecl(CopyAssignment); 9099 9100 return CopyAssignment; 9101} 9102 9103/// Diagnose an implicit copy operation for a class which is odr-used, but 9104/// which is deprecated because the class has a user-declared copy constructor, 9105/// copy assignment operator, or destructor. 9106static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 9107 SourceLocation UseLoc) { 9108 assert(CopyOp->isImplicit()); 9109 9110 CXXRecordDecl *RD = CopyOp->getParent(); 9111 CXXMethodDecl *UserDeclaredOperation = 0; 9112 9113 // In Microsoft mode, assignment operations don't affect constructors and 9114 // vice versa. 9115 if (RD->hasUserDeclaredDestructor()) { 9116 UserDeclaredOperation = RD->getDestructor(); 9117 } else if (!isa<CXXConstructorDecl>(CopyOp) && 9118 RD->hasUserDeclaredCopyConstructor() && 9119 !S.getLangOpts().MicrosoftMode) { 9120 // Find any user-declared copy constructor. 9121 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 9122 E = RD->ctor_end(); I != E; ++I) { 9123 if (I->isCopyConstructor()) { 9124 UserDeclaredOperation = *I; 9125 break; 9126 } 9127 } 9128 assert(UserDeclaredOperation); 9129 } else if (isa<CXXConstructorDecl>(CopyOp) && 9130 RD->hasUserDeclaredCopyAssignment() && 9131 !S.getLangOpts().MicrosoftMode) { 9132 // Find any user-declared move assignment operator. 9133 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 9134 E = RD->method_end(); I != E; ++I) { 9135 if (I->isCopyAssignmentOperator()) { 9136 UserDeclaredOperation = *I; 9137 break; 9138 } 9139 } 9140 assert(UserDeclaredOperation); 9141 } 9142 9143 if (UserDeclaredOperation) { 9144 S.Diag(UserDeclaredOperation->getLocation(), 9145 diag::warn_deprecated_copy_operation) 9146 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 9147 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 9148 S.Diag(UseLoc, diag::note_member_synthesized_at) 9149 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 9150 : Sema::CXXCopyAssignment) 9151 << RD; 9152 } 9153} 9154 9155void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 9156 CXXMethodDecl *CopyAssignOperator) { 9157 assert((CopyAssignOperator->isDefaulted() && 9158 CopyAssignOperator->isOverloadedOperator() && 9159 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 9160 !CopyAssignOperator->doesThisDeclarationHaveABody() && 9161 !CopyAssignOperator->isDeleted()) && 9162 "DefineImplicitCopyAssignment called for wrong function"); 9163 9164 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 9165 9166 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 9167 CopyAssignOperator->setInvalidDecl(); 9168 return; 9169 } 9170 9171 // C++11 [class.copy]p18: 9172 // The [definition of an implicitly declared copy assignment operator] is 9173 // deprecated if the class has a user-declared copy constructor or a 9174 // user-declared destructor. 9175 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 9176 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 9177 9178 CopyAssignOperator->markUsed(Context); 9179 9180 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 9181 DiagnosticErrorTrap Trap(Diags); 9182 9183 // C++0x [class.copy]p30: 9184 // The implicitly-defined or explicitly-defaulted copy assignment operator 9185 // for a non-union class X performs memberwise copy assignment of its 9186 // subobjects. The direct base classes of X are assigned first, in the 9187 // order of their declaration in the base-specifier-list, and then the 9188 // immediate non-static data members of X are assigned, in the order in 9189 // which they were declared in the class definition. 9190 9191 // The statements that form the synthesized function body. 9192 SmallVector<Stmt*, 8> Statements; 9193 9194 // The parameter for the "other" object, which we are copying from. 9195 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 9196 Qualifiers OtherQuals = Other->getType().getQualifiers(); 9197 QualType OtherRefType = Other->getType(); 9198 if (const LValueReferenceType *OtherRef 9199 = OtherRefType->getAs<LValueReferenceType>()) { 9200 OtherRefType = OtherRef->getPointeeType(); 9201 OtherQuals = OtherRefType.getQualifiers(); 9202 } 9203 9204 // Our location for everything implicitly-generated. 9205 SourceLocation Loc = CopyAssignOperator->getLocation(); 9206 9207 // Builds a DeclRefExpr for the "other" object. 9208 RefBuilder OtherRef(Other, OtherRefType); 9209 9210 // Builds the "this" pointer. 9211 ThisBuilder This; 9212 9213 // Assign base classes. 9214 bool Invalid = false; 9215 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9216 E = ClassDecl->bases_end(); Base != E; ++Base) { 9217 // Form the assignment: 9218 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 9219 QualType BaseType = Base->getType().getUnqualifiedType(); 9220 if (!BaseType->isRecordType()) { 9221 Invalid = true; 9222 continue; 9223 } 9224 9225 CXXCastPath BasePath; 9226 BasePath.push_back(Base); 9227 9228 // Construct the "from" expression, which is an implicit cast to the 9229 // appropriately-qualified base type. 9230 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), 9231 VK_LValue, BasePath); 9232 9233 // Dereference "this". 9234 DerefBuilder DerefThis(This); 9235 CastBuilder To(DerefThis, 9236 Context.getCVRQualifiedType( 9237 BaseType, CopyAssignOperator->getTypeQualifiers()), 9238 VK_LValue, BasePath); 9239 9240 // Build the copy. 9241 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 9242 To, From, 9243 /*CopyingBaseSubobject=*/true, 9244 /*Copying=*/true); 9245 if (Copy.isInvalid()) { 9246 Diag(CurrentLocation, diag::note_member_synthesized_at) 9247 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9248 CopyAssignOperator->setInvalidDecl(); 9249 return; 9250 } 9251 9252 // Success! Record the copy. 9253 Statements.push_back(Copy.takeAs<Expr>()); 9254 } 9255 9256 // Assign non-static members. 9257 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9258 FieldEnd = ClassDecl->field_end(); 9259 Field != FieldEnd; ++Field) { 9260 if (Field->isUnnamedBitfield()) 9261 continue; 9262 9263 if (Field->isInvalidDecl()) { 9264 Invalid = true; 9265 continue; 9266 } 9267 9268 // Check for members of reference type; we can't copy those. 9269 if (Field->getType()->isReferenceType()) { 9270 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9271 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9272 Diag(Field->getLocation(), diag::note_declared_at); 9273 Diag(CurrentLocation, diag::note_member_synthesized_at) 9274 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9275 Invalid = true; 9276 continue; 9277 } 9278 9279 // Check for members of const-qualified, non-class type. 9280 QualType BaseType = Context.getBaseElementType(Field->getType()); 9281 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9282 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9283 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9284 Diag(Field->getLocation(), diag::note_declared_at); 9285 Diag(CurrentLocation, diag::note_member_synthesized_at) 9286 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9287 Invalid = true; 9288 continue; 9289 } 9290 9291 // Suppress assigning zero-width bitfields. 9292 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9293 continue; 9294 9295 QualType FieldType = Field->getType().getNonReferenceType(); 9296 if (FieldType->isIncompleteArrayType()) { 9297 assert(ClassDecl->hasFlexibleArrayMember() && 9298 "Incomplete array type is not valid"); 9299 continue; 9300 } 9301 9302 // Build references to the field in the object we're copying from and to. 9303 CXXScopeSpec SS; // Intentionally empty 9304 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9305 LookupMemberName); 9306 MemberLookup.addDecl(*Field); 9307 MemberLookup.resolveKind(); 9308 9309 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); 9310 9311 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); 9312 9313 // Build the copy of this field. 9314 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9315 To, From, 9316 /*CopyingBaseSubobject=*/false, 9317 /*Copying=*/true); 9318 if (Copy.isInvalid()) { 9319 Diag(CurrentLocation, diag::note_member_synthesized_at) 9320 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9321 CopyAssignOperator->setInvalidDecl(); 9322 return; 9323 } 9324 9325 // Success! Record the copy. 9326 Statements.push_back(Copy.takeAs<Stmt>()); 9327 } 9328 9329 if (!Invalid) { 9330 // Add a "return *this;" 9331 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9332 9333 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9334 if (Return.isInvalid()) 9335 Invalid = true; 9336 else { 9337 Statements.push_back(Return.takeAs<Stmt>()); 9338 9339 if (Trap.hasErrorOccurred()) { 9340 Diag(CurrentLocation, diag::note_member_synthesized_at) 9341 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9342 Invalid = true; 9343 } 9344 } 9345 } 9346 9347 if (Invalid) { 9348 CopyAssignOperator->setInvalidDecl(); 9349 return; 9350 } 9351 9352 StmtResult Body; 9353 { 9354 CompoundScopeRAII CompoundScope(*this); 9355 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9356 /*isStmtExpr=*/false); 9357 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9358 } 9359 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9360 9361 if (ASTMutationListener *L = getASTMutationListener()) { 9362 L->CompletedImplicitDefinition(CopyAssignOperator); 9363 } 9364} 9365 9366Sema::ImplicitExceptionSpecification 9367Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9368 CXXRecordDecl *ClassDecl = MD->getParent(); 9369 9370 ImplicitExceptionSpecification ExceptSpec(*this); 9371 if (ClassDecl->isInvalidDecl()) 9372 return ExceptSpec; 9373 9374 // C++0x [except.spec]p14: 9375 // An implicitly declared special member function (Clause 12) shall have an 9376 // exception-specification. [...] 9377 9378 // It is unspecified whether or not an implicit move assignment operator 9379 // attempts to deduplicate calls to assignment operators of virtual bases are 9380 // made. As such, this exception specification is effectively unspecified. 9381 // Based on a similar decision made for constness in C++0x, we're erring on 9382 // the side of assuming such calls to be made regardless of whether they 9383 // actually happen. 9384 // Note that a move constructor is not implicitly declared when there are 9385 // virtual bases, but it can still be user-declared and explicitly defaulted. 9386 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9387 BaseEnd = ClassDecl->bases_end(); 9388 Base != BaseEnd; ++Base) { 9389 if (Base->isVirtual()) 9390 continue; 9391 9392 CXXRecordDecl *BaseClassDecl 9393 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9394 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9395 0, false, 0)) 9396 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9397 } 9398 9399 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9400 BaseEnd = ClassDecl->vbases_end(); 9401 Base != BaseEnd; ++Base) { 9402 CXXRecordDecl *BaseClassDecl 9403 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9404 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9405 0, false, 0)) 9406 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9407 } 9408 9409 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9410 FieldEnd = ClassDecl->field_end(); 9411 Field != FieldEnd; 9412 ++Field) { 9413 QualType FieldType = Context.getBaseElementType(Field->getType()); 9414 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9415 if (CXXMethodDecl *MoveAssign = 9416 LookupMovingAssignment(FieldClassDecl, 9417 FieldType.getCVRQualifiers(), 9418 false, 0)) 9419 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9420 } 9421 } 9422 9423 return ExceptSpec; 9424} 9425 9426/// Determine whether the class type has any direct or indirect virtual base 9427/// classes which have a non-trivial move assignment operator. 9428static bool 9429hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9430 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9431 BaseEnd = ClassDecl->vbases_end(); 9432 Base != BaseEnd; ++Base) { 9433 CXXRecordDecl *BaseClass = 9434 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9435 9436 // Try to declare the move assignment. If it would be deleted, then the 9437 // class does not have a non-trivial move assignment. 9438 if (BaseClass->needsImplicitMoveAssignment()) 9439 S.DeclareImplicitMoveAssignment(BaseClass); 9440 9441 if (BaseClass->hasNonTrivialMoveAssignment()) 9442 return true; 9443 } 9444 9445 return false; 9446} 9447 9448/// Determine whether the given type either has a move constructor or is 9449/// trivially copyable. 9450static bool 9451hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9452 Type = S.Context.getBaseElementType(Type); 9453 9454 // FIXME: Technically, non-trivially-copyable non-class types, such as 9455 // reference types, are supposed to return false here, but that appears 9456 // to be a standard defect. 9457 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9458 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9459 return true; 9460 9461 if (Type.isTriviallyCopyableType(S.Context)) 9462 return true; 9463 9464 if (IsConstructor) { 9465 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9466 // give the right answer. 9467 if (ClassDecl->needsImplicitMoveConstructor()) 9468 S.DeclareImplicitMoveConstructor(ClassDecl); 9469 return ClassDecl->hasMoveConstructor(); 9470 } 9471 9472 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9473 // give the right answer. 9474 if (ClassDecl->needsImplicitMoveAssignment()) 9475 S.DeclareImplicitMoveAssignment(ClassDecl); 9476 return ClassDecl->hasMoveAssignment(); 9477} 9478 9479/// Determine whether all non-static data members and direct or virtual bases 9480/// of class \p ClassDecl have either a move operation, or are trivially 9481/// copyable. 9482static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9483 bool IsConstructor) { 9484 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9485 BaseEnd = ClassDecl->bases_end(); 9486 Base != BaseEnd; ++Base) { 9487 if (Base->isVirtual()) 9488 continue; 9489 9490 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9491 return false; 9492 } 9493 9494 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9495 BaseEnd = ClassDecl->vbases_end(); 9496 Base != BaseEnd; ++Base) { 9497 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9498 return false; 9499 } 9500 9501 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9502 FieldEnd = ClassDecl->field_end(); 9503 Field != FieldEnd; ++Field) { 9504 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9505 return false; 9506 } 9507 9508 return true; 9509} 9510 9511CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9512 // C++11 [class.copy]p20: 9513 // If the definition of a class X does not explicitly declare a move 9514 // assignment operator, one will be implicitly declared as defaulted 9515 // if and only if: 9516 // 9517 // - [first 4 bullets] 9518 assert(ClassDecl->needsImplicitMoveAssignment()); 9519 9520 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9521 if (DSM.isAlreadyBeingDeclared()) 9522 return 0; 9523 9524 // [Checked after we build the declaration] 9525 // - the move assignment operator would not be implicitly defined as 9526 // deleted, 9527 9528 // [DR1402]: 9529 // - X has no direct or indirect virtual base class with a non-trivial 9530 // move assignment operator, and 9531 // - each of X's non-static data members and direct or virtual base classes 9532 // has a type that either has a move assignment operator or is trivially 9533 // copyable. 9534 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9535 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9536 ClassDecl->setFailedImplicitMoveAssignment(); 9537 return 0; 9538 } 9539 9540 // Note: The following rules are largely analoguous to the move 9541 // constructor rules. 9542 9543 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9544 QualType RetType = Context.getLValueReferenceType(ArgType); 9545 ArgType = Context.getRValueReferenceType(ArgType); 9546 9547 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9548 CXXMoveAssignment, 9549 false); 9550 9551 // An implicitly-declared move assignment operator is an inline public 9552 // member of its class. 9553 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9554 SourceLocation ClassLoc = ClassDecl->getLocation(); 9555 DeclarationNameInfo NameInfo(Name, ClassLoc); 9556 CXXMethodDecl *MoveAssignment = 9557 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9558 /*TInfo=*/0, /*StorageClass=*/SC_None, 9559 /*isInline=*/true, Constexpr, SourceLocation()); 9560 MoveAssignment->setAccess(AS_public); 9561 MoveAssignment->setDefaulted(); 9562 MoveAssignment->setImplicit(); 9563 9564 // Build an exception specification pointing back at this member. 9565 FunctionProtoType::ExtProtoInfo EPI = 9566 getImplicitMethodEPI(*this, MoveAssignment); 9567 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9568 9569 // Add the parameter to the operator. 9570 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9571 ClassLoc, ClassLoc, /*Id=*/0, 9572 ArgType, /*TInfo=*/0, 9573 SC_None, 0); 9574 MoveAssignment->setParams(FromParam); 9575 9576 AddOverriddenMethods(ClassDecl, MoveAssignment); 9577 9578 MoveAssignment->setTrivial( 9579 ClassDecl->needsOverloadResolutionForMoveAssignment() 9580 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9581 : ClassDecl->hasTrivialMoveAssignment()); 9582 9583 // C++0x [class.copy]p9: 9584 // If the definition of a class X does not explicitly declare a move 9585 // assignment operator, one will be implicitly declared as defaulted if and 9586 // only if: 9587 // [...] 9588 // - the move assignment operator would not be implicitly defined as 9589 // deleted. 9590 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9591 // Cache this result so that we don't try to generate this over and over 9592 // on every lookup, leaking memory and wasting time. 9593 ClassDecl->setFailedImplicitMoveAssignment(); 9594 return 0; 9595 } 9596 9597 // Note that we have added this copy-assignment operator. 9598 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9599 9600 if (Scope *S = getScopeForContext(ClassDecl)) 9601 PushOnScopeChains(MoveAssignment, S, false); 9602 ClassDecl->addDecl(MoveAssignment); 9603 9604 return MoveAssignment; 9605} 9606 9607void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9608 CXXMethodDecl *MoveAssignOperator) { 9609 assert((MoveAssignOperator->isDefaulted() && 9610 MoveAssignOperator->isOverloadedOperator() && 9611 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9612 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9613 !MoveAssignOperator->isDeleted()) && 9614 "DefineImplicitMoveAssignment called for wrong function"); 9615 9616 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9617 9618 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9619 MoveAssignOperator->setInvalidDecl(); 9620 return; 9621 } 9622 9623 MoveAssignOperator->markUsed(Context); 9624 9625 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9626 DiagnosticErrorTrap Trap(Diags); 9627 9628 // C++0x [class.copy]p28: 9629 // The implicitly-defined or move assignment operator for a non-union class 9630 // X performs memberwise move assignment of its subobjects. The direct base 9631 // classes of X are assigned first, in the order of their declaration in the 9632 // base-specifier-list, and then the immediate non-static data members of X 9633 // are assigned, in the order in which they were declared in the class 9634 // definition. 9635 9636 // The statements that form the synthesized function body. 9637 SmallVector<Stmt*, 8> Statements; 9638 9639 // The parameter for the "other" object, which we are move from. 9640 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9641 QualType OtherRefType = Other->getType()-> 9642 getAs<RValueReferenceType>()->getPointeeType(); 9643 assert(!OtherRefType.getQualifiers() && 9644 "Bad argument type of defaulted move assignment"); 9645 9646 // Our location for everything implicitly-generated. 9647 SourceLocation Loc = MoveAssignOperator->getLocation(); 9648 9649 // Builds a reference to the "other" object. 9650 RefBuilder OtherRef(Other, OtherRefType); 9651 // Cast to rvalue. 9652 MoveCastBuilder MoveOther(OtherRef); 9653 9654 // Builds the "this" pointer. 9655 ThisBuilder This; 9656 9657 // Assign base classes. 9658 bool Invalid = false; 9659 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9660 E = ClassDecl->bases_end(); Base != E; ++Base) { 9661 // Form the assignment: 9662 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9663 QualType BaseType = Base->getType().getUnqualifiedType(); 9664 if (!BaseType->isRecordType()) { 9665 Invalid = true; 9666 continue; 9667 } 9668 9669 CXXCastPath BasePath; 9670 BasePath.push_back(Base); 9671 9672 // Construct the "from" expression, which is an implicit cast to the 9673 // appropriately-qualified base type. 9674 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); 9675 9676 // Dereference "this". 9677 DerefBuilder DerefThis(This); 9678 9679 // Implicitly cast "this" to the appropriately-qualified base type. 9680 CastBuilder To(DerefThis, 9681 Context.getCVRQualifiedType( 9682 BaseType, MoveAssignOperator->getTypeQualifiers()), 9683 VK_LValue, BasePath); 9684 9685 // Build the move. 9686 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9687 To, From, 9688 /*CopyingBaseSubobject=*/true, 9689 /*Copying=*/false); 9690 if (Move.isInvalid()) { 9691 Diag(CurrentLocation, diag::note_member_synthesized_at) 9692 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9693 MoveAssignOperator->setInvalidDecl(); 9694 return; 9695 } 9696 9697 // Success! Record the move. 9698 Statements.push_back(Move.takeAs<Expr>()); 9699 } 9700 9701 // Assign non-static members. 9702 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9703 FieldEnd = ClassDecl->field_end(); 9704 Field != FieldEnd; ++Field) { 9705 if (Field->isUnnamedBitfield()) 9706 continue; 9707 9708 if (Field->isInvalidDecl()) { 9709 Invalid = true; 9710 continue; 9711 } 9712 9713 // Check for members of reference type; we can't move those. 9714 if (Field->getType()->isReferenceType()) { 9715 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9716 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9717 Diag(Field->getLocation(), diag::note_declared_at); 9718 Diag(CurrentLocation, diag::note_member_synthesized_at) 9719 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9720 Invalid = true; 9721 continue; 9722 } 9723 9724 // Check for members of const-qualified, non-class type. 9725 QualType BaseType = Context.getBaseElementType(Field->getType()); 9726 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9727 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9728 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9729 Diag(Field->getLocation(), diag::note_declared_at); 9730 Diag(CurrentLocation, diag::note_member_synthesized_at) 9731 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9732 Invalid = true; 9733 continue; 9734 } 9735 9736 // Suppress assigning zero-width bitfields. 9737 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9738 continue; 9739 9740 QualType FieldType = Field->getType().getNonReferenceType(); 9741 if (FieldType->isIncompleteArrayType()) { 9742 assert(ClassDecl->hasFlexibleArrayMember() && 9743 "Incomplete array type is not valid"); 9744 continue; 9745 } 9746 9747 // Build references to the field in the object we're copying from and to. 9748 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9749 LookupMemberName); 9750 MemberLookup.addDecl(*Field); 9751 MemberLookup.resolveKind(); 9752 MemberBuilder From(MoveOther, OtherRefType, 9753 /*IsArrow=*/false, MemberLookup); 9754 MemberBuilder To(This, getCurrentThisType(), 9755 /*IsArrow=*/true, MemberLookup); 9756 9757 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue 9758 "Member reference with rvalue base must be rvalue except for reference " 9759 "members, which aren't allowed for move assignment."); 9760 9761 // Build the move of this field. 9762 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9763 To, From, 9764 /*CopyingBaseSubobject=*/false, 9765 /*Copying=*/false); 9766 if (Move.isInvalid()) { 9767 Diag(CurrentLocation, diag::note_member_synthesized_at) 9768 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9769 MoveAssignOperator->setInvalidDecl(); 9770 return; 9771 } 9772 9773 // Success! Record the copy. 9774 Statements.push_back(Move.takeAs<Stmt>()); 9775 } 9776 9777 if (!Invalid) { 9778 // Add a "return *this;" 9779 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9780 9781 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9782 if (Return.isInvalid()) 9783 Invalid = true; 9784 else { 9785 Statements.push_back(Return.takeAs<Stmt>()); 9786 9787 if (Trap.hasErrorOccurred()) { 9788 Diag(CurrentLocation, diag::note_member_synthesized_at) 9789 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9790 Invalid = true; 9791 } 9792 } 9793 } 9794 9795 if (Invalid) { 9796 MoveAssignOperator->setInvalidDecl(); 9797 return; 9798 } 9799 9800 StmtResult Body; 9801 { 9802 CompoundScopeRAII CompoundScope(*this); 9803 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9804 /*isStmtExpr=*/false); 9805 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9806 } 9807 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9808 9809 if (ASTMutationListener *L = getASTMutationListener()) { 9810 L->CompletedImplicitDefinition(MoveAssignOperator); 9811 } 9812} 9813 9814Sema::ImplicitExceptionSpecification 9815Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9816 CXXRecordDecl *ClassDecl = MD->getParent(); 9817 9818 ImplicitExceptionSpecification ExceptSpec(*this); 9819 if (ClassDecl->isInvalidDecl()) 9820 return ExceptSpec; 9821 9822 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9823 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9824 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9825 9826 // C++ [except.spec]p14: 9827 // An implicitly declared special member function (Clause 12) shall have an 9828 // exception-specification. [...] 9829 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9830 BaseEnd = ClassDecl->bases_end(); 9831 Base != BaseEnd; 9832 ++Base) { 9833 // Virtual bases are handled below. 9834 if (Base->isVirtual()) 9835 continue; 9836 9837 CXXRecordDecl *BaseClassDecl 9838 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9839 if (CXXConstructorDecl *CopyConstructor = 9840 LookupCopyingConstructor(BaseClassDecl, Quals)) 9841 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9842 } 9843 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9844 BaseEnd = ClassDecl->vbases_end(); 9845 Base != BaseEnd; 9846 ++Base) { 9847 CXXRecordDecl *BaseClassDecl 9848 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9849 if (CXXConstructorDecl *CopyConstructor = 9850 LookupCopyingConstructor(BaseClassDecl, Quals)) 9851 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9852 } 9853 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9854 FieldEnd = ClassDecl->field_end(); 9855 Field != FieldEnd; 9856 ++Field) { 9857 QualType FieldType = Context.getBaseElementType(Field->getType()); 9858 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9859 if (CXXConstructorDecl *CopyConstructor = 9860 LookupCopyingConstructor(FieldClassDecl, 9861 Quals | FieldType.getCVRQualifiers())) 9862 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9863 } 9864 } 9865 9866 return ExceptSpec; 9867} 9868 9869CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9870 CXXRecordDecl *ClassDecl) { 9871 // C++ [class.copy]p4: 9872 // If the class definition does not explicitly declare a copy 9873 // constructor, one is declared implicitly. 9874 assert(ClassDecl->needsImplicitCopyConstructor()); 9875 9876 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9877 if (DSM.isAlreadyBeingDeclared()) 9878 return 0; 9879 9880 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9881 QualType ArgType = ClassType; 9882 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9883 if (Const) 9884 ArgType = ArgType.withConst(); 9885 ArgType = Context.getLValueReferenceType(ArgType); 9886 9887 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9888 CXXCopyConstructor, 9889 Const); 9890 9891 DeclarationName Name 9892 = Context.DeclarationNames.getCXXConstructorName( 9893 Context.getCanonicalType(ClassType)); 9894 SourceLocation ClassLoc = ClassDecl->getLocation(); 9895 DeclarationNameInfo NameInfo(Name, ClassLoc); 9896 9897 // An implicitly-declared copy constructor is an inline public 9898 // member of its class. 9899 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9900 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9901 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9902 Constexpr); 9903 CopyConstructor->setAccess(AS_public); 9904 CopyConstructor->setDefaulted(); 9905 9906 // Build an exception specification pointing back at this member. 9907 FunctionProtoType::ExtProtoInfo EPI = 9908 getImplicitMethodEPI(*this, CopyConstructor); 9909 CopyConstructor->setType( 9910 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9911 9912 // Add the parameter to the constructor. 9913 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9914 ClassLoc, ClassLoc, 9915 /*IdentifierInfo=*/0, 9916 ArgType, /*TInfo=*/0, 9917 SC_None, 0); 9918 CopyConstructor->setParams(FromParam); 9919 9920 CopyConstructor->setTrivial( 9921 ClassDecl->needsOverloadResolutionForCopyConstructor() 9922 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9923 : ClassDecl->hasTrivialCopyConstructor()); 9924 9925 // C++11 [class.copy]p8: 9926 // ... If the class definition does not explicitly declare a copy 9927 // constructor, there is no user-declared move constructor, and there is no 9928 // user-declared move assignment operator, a copy constructor is implicitly 9929 // declared as defaulted. 9930 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9931 SetDeclDeleted(CopyConstructor, ClassLoc); 9932 9933 // Note that we have declared this constructor. 9934 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9935 9936 if (Scope *S = getScopeForContext(ClassDecl)) 9937 PushOnScopeChains(CopyConstructor, S, false); 9938 ClassDecl->addDecl(CopyConstructor); 9939 9940 return CopyConstructor; 9941} 9942 9943void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9944 CXXConstructorDecl *CopyConstructor) { 9945 assert((CopyConstructor->isDefaulted() && 9946 CopyConstructor->isCopyConstructor() && 9947 !CopyConstructor->doesThisDeclarationHaveABody() && 9948 !CopyConstructor->isDeleted()) && 9949 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9950 9951 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9952 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9953 9954 // C++11 [class.copy]p7: 9955 // The [definition of an implicitly declared copy constructor] is 9956 // deprecated if the class has a user-declared copy assignment operator 9957 // or a user-declared destructor. 9958 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 9959 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 9960 9961 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9962 DiagnosticErrorTrap Trap(Diags); 9963 9964 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9965 Trap.hasErrorOccurred()) { 9966 Diag(CurrentLocation, diag::note_member_synthesized_at) 9967 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9968 CopyConstructor->setInvalidDecl(); 9969 } else { 9970 Sema::CompoundScopeRAII CompoundScope(*this); 9971 CopyConstructor->setBody(ActOnCompoundStmt( 9972 CopyConstructor->getLocation(), CopyConstructor->getLocation(), None, 9973 /*isStmtExpr=*/ false).takeAs<Stmt>()); 9974 } 9975 9976 CopyConstructor->markUsed(Context); 9977 if (ASTMutationListener *L = getASTMutationListener()) { 9978 L->CompletedImplicitDefinition(CopyConstructor); 9979 } 9980} 9981 9982Sema::ImplicitExceptionSpecification 9983Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9984 CXXRecordDecl *ClassDecl = MD->getParent(); 9985 9986 // C++ [except.spec]p14: 9987 // An implicitly declared special member function (Clause 12) shall have an 9988 // exception-specification. [...] 9989 ImplicitExceptionSpecification ExceptSpec(*this); 9990 if (ClassDecl->isInvalidDecl()) 9991 return ExceptSpec; 9992 9993 // Direct base-class constructors. 9994 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9995 BEnd = ClassDecl->bases_end(); 9996 B != BEnd; ++B) { 9997 if (B->isVirtual()) // Handled below. 9998 continue; 9999 10000 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10001 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10002 CXXConstructorDecl *Constructor = 10003 LookupMovingConstructor(BaseClassDecl, 0); 10004 // If this is a deleted function, add it anyway. This might be conformant 10005 // with the standard. This might not. I'm not sure. It might not matter. 10006 if (Constructor) 10007 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10008 } 10009 } 10010 10011 // Virtual base-class constructors. 10012 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 10013 BEnd = ClassDecl->vbases_end(); 10014 B != BEnd; ++B) { 10015 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10016 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10017 CXXConstructorDecl *Constructor = 10018 LookupMovingConstructor(BaseClassDecl, 0); 10019 // If this is a deleted function, add it anyway. This might be conformant 10020 // with the standard. This might not. I'm not sure. It might not matter. 10021 if (Constructor) 10022 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10023 } 10024 } 10025 10026 // Field constructors. 10027 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 10028 FEnd = ClassDecl->field_end(); 10029 F != FEnd; ++F) { 10030 QualType FieldType = Context.getBaseElementType(F->getType()); 10031 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 10032 CXXConstructorDecl *Constructor = 10033 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 10034 // If this is a deleted function, add it anyway. This might be conformant 10035 // with the standard. This might not. I'm not sure. It might not matter. 10036 // In particular, the problem is that this function never gets called. It 10037 // might just be ill-formed because this function attempts to refer to 10038 // a deleted function here. 10039 if (Constructor) 10040 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 10041 } 10042 } 10043 10044 return ExceptSpec; 10045} 10046 10047CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 10048 CXXRecordDecl *ClassDecl) { 10049 // C++11 [class.copy]p9: 10050 // If the definition of a class X does not explicitly declare a move 10051 // constructor, one will be implicitly declared as defaulted if and only if: 10052 // 10053 // - [first 4 bullets] 10054 assert(ClassDecl->needsImplicitMoveConstructor()); 10055 10056 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 10057 if (DSM.isAlreadyBeingDeclared()) 10058 return 0; 10059 10060 // [Checked after we build the declaration] 10061 // - the move assignment operator would not be implicitly defined as 10062 // deleted, 10063 10064 // [DR1402]: 10065 // - each of X's non-static data members and direct or virtual base classes 10066 // has a type that either has a move constructor or is trivially copyable. 10067 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 10068 ClassDecl->setFailedImplicitMoveConstructor(); 10069 return 0; 10070 } 10071 10072 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10073 QualType ArgType = Context.getRValueReferenceType(ClassType); 10074 10075 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10076 CXXMoveConstructor, 10077 false); 10078 10079 DeclarationName Name 10080 = Context.DeclarationNames.getCXXConstructorName( 10081 Context.getCanonicalType(ClassType)); 10082 SourceLocation ClassLoc = ClassDecl->getLocation(); 10083 DeclarationNameInfo NameInfo(Name, ClassLoc); 10084 10085 // C++11 [class.copy]p11: 10086 // An implicitly-declared copy/move constructor is an inline public 10087 // member of its class. 10088 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 10089 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10090 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10091 Constexpr); 10092 MoveConstructor->setAccess(AS_public); 10093 MoveConstructor->setDefaulted(); 10094 10095 // Build an exception specification pointing back at this member. 10096 FunctionProtoType::ExtProtoInfo EPI = 10097 getImplicitMethodEPI(*this, MoveConstructor); 10098 MoveConstructor->setType( 10099 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10100 10101 // Add the parameter to the constructor. 10102 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 10103 ClassLoc, ClassLoc, 10104 /*IdentifierInfo=*/0, 10105 ArgType, /*TInfo=*/0, 10106 SC_None, 0); 10107 MoveConstructor->setParams(FromParam); 10108 10109 MoveConstructor->setTrivial( 10110 ClassDecl->needsOverloadResolutionForMoveConstructor() 10111 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 10112 : ClassDecl->hasTrivialMoveConstructor()); 10113 10114 // C++0x [class.copy]p9: 10115 // If the definition of a class X does not explicitly declare a move 10116 // constructor, one will be implicitly declared as defaulted if and only if: 10117 // [...] 10118 // - the move constructor would not be implicitly defined as deleted. 10119 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 10120 // Cache this result so that we don't try to generate this over and over 10121 // on every lookup, leaking memory and wasting time. 10122 ClassDecl->setFailedImplicitMoveConstructor(); 10123 return 0; 10124 } 10125 10126 // Note that we have declared this constructor. 10127 ++ASTContext::NumImplicitMoveConstructorsDeclared; 10128 10129 if (Scope *S = getScopeForContext(ClassDecl)) 10130 PushOnScopeChains(MoveConstructor, S, false); 10131 ClassDecl->addDecl(MoveConstructor); 10132 10133 return MoveConstructor; 10134} 10135 10136void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 10137 CXXConstructorDecl *MoveConstructor) { 10138 assert((MoveConstructor->isDefaulted() && 10139 MoveConstructor->isMoveConstructor() && 10140 !MoveConstructor->doesThisDeclarationHaveABody() && 10141 !MoveConstructor->isDeleted()) && 10142 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 10143 10144 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 10145 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 10146 10147 SynthesizedFunctionScope Scope(*this, MoveConstructor); 10148 DiagnosticErrorTrap Trap(Diags); 10149 10150 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 10151 Trap.hasErrorOccurred()) { 10152 Diag(CurrentLocation, diag::note_member_synthesized_at) 10153 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 10154 MoveConstructor->setInvalidDecl(); 10155 } else { 10156 Sema::CompoundScopeRAII CompoundScope(*this); 10157 MoveConstructor->setBody(ActOnCompoundStmt( 10158 MoveConstructor->getLocation(), MoveConstructor->getLocation(), None, 10159 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10160 } 10161 10162 MoveConstructor->markUsed(Context); 10163 10164 if (ASTMutationListener *L = getASTMutationListener()) { 10165 L->CompletedImplicitDefinition(MoveConstructor); 10166 } 10167} 10168 10169bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 10170 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); 10171} 10172 10173/// \brief Mark the call operator of the given lambda closure type as "used". 10174static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 10175 CXXMethodDecl *CallOperator 10176 = cast<CXXMethodDecl>( 10177 Lambda->lookup( 10178 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 10179 CallOperator->setReferenced(); 10180 CallOperator->markUsed(S.Context); 10181} 10182 10183void Sema::DefineImplicitLambdaToFunctionPointerConversion( 10184 SourceLocation CurrentLocation, 10185 CXXConversionDecl *Conv) 10186{ 10187 CXXRecordDecl *Lambda = Conv->getParent(); 10188 10189 // Make sure that the lambda call operator is marked used. 10190 markLambdaCallOperatorUsed(*this, Lambda); 10191 10192 Conv->markUsed(Context); 10193 10194 SynthesizedFunctionScope Scope(*this, Conv); 10195 DiagnosticErrorTrap Trap(Diags); 10196 10197 // Return the address of the __invoke function. 10198 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 10199 CXXMethodDecl *Invoke 10200 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 10201 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 10202 VK_LValue, Conv->getLocation()).take(); 10203 assert(FunctionRef && "Can't refer to __invoke function?"); 10204 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 10205 Conv->setBody(new (Context) CompoundStmt(Context, Return, 10206 Conv->getLocation(), 10207 Conv->getLocation())); 10208 10209 // Fill in the __invoke function with a dummy implementation. IR generation 10210 // will fill in the actual details. 10211 Invoke->markUsed(Context); 10212 Invoke->setReferenced(); 10213 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 10214 10215 if (ASTMutationListener *L = getASTMutationListener()) { 10216 L->CompletedImplicitDefinition(Conv); 10217 L->CompletedImplicitDefinition(Invoke); 10218 } 10219} 10220 10221void Sema::DefineImplicitLambdaToBlockPointerConversion( 10222 SourceLocation CurrentLocation, 10223 CXXConversionDecl *Conv) 10224{ 10225 Conv->markUsed(Context); 10226 10227 SynthesizedFunctionScope Scope(*this, Conv); 10228 DiagnosticErrorTrap Trap(Diags); 10229 10230 // Copy-initialize the lambda object as needed to capture it. 10231 Expr *This = ActOnCXXThis(CurrentLocation).take(); 10232 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 10233 10234 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 10235 Conv->getLocation(), 10236 Conv, DerefThis); 10237 10238 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 10239 // behavior. Note that only the general conversion function does this 10240 // (since it's unusable otherwise); in the case where we inline the 10241 // block literal, it has block literal lifetime semantics. 10242 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 10243 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 10244 CK_CopyAndAutoreleaseBlockObject, 10245 BuildBlock.get(), 0, VK_RValue); 10246 10247 if (BuildBlock.isInvalid()) { 10248 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10249 Conv->setInvalidDecl(); 10250 return; 10251 } 10252 10253 // Create the return statement that returns the block from the conversion 10254 // function. 10255 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10256 if (Return.isInvalid()) { 10257 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10258 Conv->setInvalidDecl(); 10259 return; 10260 } 10261 10262 // Set the body of the conversion function. 10263 Stmt *ReturnS = Return.take(); 10264 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10265 Conv->getLocation(), 10266 Conv->getLocation())); 10267 10268 // We're done; notify the mutation listener, if any. 10269 if (ASTMutationListener *L = getASTMutationListener()) { 10270 L->CompletedImplicitDefinition(Conv); 10271 } 10272} 10273 10274/// \brief Determine whether the given list arguments contains exactly one 10275/// "real" (non-default) argument. 10276static bool hasOneRealArgument(MultiExprArg Args) { 10277 switch (Args.size()) { 10278 case 0: 10279 return false; 10280 10281 default: 10282 if (!Args[1]->isDefaultArgument()) 10283 return false; 10284 10285 // fall through 10286 case 1: 10287 return !Args[0]->isDefaultArgument(); 10288 } 10289 10290 return false; 10291} 10292 10293ExprResult 10294Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10295 CXXConstructorDecl *Constructor, 10296 MultiExprArg ExprArgs, 10297 bool HadMultipleCandidates, 10298 bool IsListInitialization, 10299 bool RequiresZeroInit, 10300 unsigned ConstructKind, 10301 SourceRange ParenRange) { 10302 bool Elidable = false; 10303 10304 // C++0x [class.copy]p34: 10305 // When certain criteria are met, an implementation is allowed to 10306 // omit the copy/move construction of a class object, even if the 10307 // copy/move constructor and/or destructor for the object have 10308 // side effects. [...] 10309 // - when a temporary class object that has not been bound to a 10310 // reference (12.2) would be copied/moved to a class object 10311 // with the same cv-unqualified type, the copy/move operation 10312 // can be omitted by constructing the temporary object 10313 // directly into the target of the omitted copy/move 10314 if (ConstructKind == CXXConstructExpr::CK_Complete && 10315 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10316 Expr *SubExpr = ExprArgs[0]; 10317 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10318 } 10319 10320 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10321 Elidable, ExprArgs, HadMultipleCandidates, 10322 IsListInitialization, RequiresZeroInit, 10323 ConstructKind, ParenRange); 10324} 10325 10326/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10327/// including handling of its default argument expressions. 10328ExprResult 10329Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10330 CXXConstructorDecl *Constructor, bool Elidable, 10331 MultiExprArg ExprArgs, 10332 bool HadMultipleCandidates, 10333 bool IsListInitialization, 10334 bool RequiresZeroInit, 10335 unsigned ConstructKind, 10336 SourceRange ParenRange) { 10337 MarkFunctionReferenced(ConstructLoc, Constructor); 10338 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10339 Constructor, Elidable, ExprArgs, 10340 HadMultipleCandidates, 10341 IsListInitialization, RequiresZeroInit, 10342 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10343 ParenRange)); 10344} 10345 10346void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10347 if (VD->isInvalidDecl()) return; 10348 10349 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10350 if (ClassDecl->isInvalidDecl()) return; 10351 if (ClassDecl->hasIrrelevantDestructor()) return; 10352 if (ClassDecl->isDependentContext()) return; 10353 10354 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10355 MarkFunctionReferenced(VD->getLocation(), Destructor); 10356 CheckDestructorAccess(VD->getLocation(), Destructor, 10357 PDiag(diag::err_access_dtor_var) 10358 << VD->getDeclName() 10359 << VD->getType()); 10360 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10361 10362 if (!VD->hasGlobalStorage()) return; 10363 10364 // Emit warning for non-trivial dtor in global scope (a real global, 10365 // class-static, function-static). 10366 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10367 10368 // TODO: this should be re-enabled for static locals by !CXAAtExit 10369 if (!VD->isStaticLocal()) 10370 Diag(VD->getLocation(), diag::warn_global_destructor); 10371} 10372 10373/// \brief Given a constructor and the set of arguments provided for the 10374/// constructor, convert the arguments and add any required default arguments 10375/// to form a proper call to this constructor. 10376/// 10377/// \returns true if an error occurred, false otherwise. 10378bool 10379Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10380 MultiExprArg ArgsPtr, 10381 SourceLocation Loc, 10382 SmallVectorImpl<Expr*> &ConvertedArgs, 10383 bool AllowExplicit, 10384 bool IsListInitialization) { 10385 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10386 unsigned NumArgs = ArgsPtr.size(); 10387 Expr **Args = ArgsPtr.data(); 10388 10389 const FunctionProtoType *Proto 10390 = Constructor->getType()->getAs<FunctionProtoType>(); 10391 assert(Proto && "Constructor without a prototype?"); 10392 unsigned NumArgsInProto = Proto->getNumArgs(); 10393 10394 // If too few arguments are available, we'll fill in the rest with defaults. 10395 if (NumArgs < NumArgsInProto) 10396 ConvertedArgs.reserve(NumArgsInProto); 10397 else 10398 ConvertedArgs.reserve(NumArgs); 10399 10400 VariadicCallType CallType = 10401 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10402 SmallVector<Expr *, 8> AllArgs; 10403 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10404 Proto, 0, 10405 llvm::makeArrayRef(Args, NumArgs), 10406 AllArgs, 10407 CallType, AllowExplicit, 10408 IsListInitialization); 10409 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10410 10411 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10412 10413 CheckConstructorCall(Constructor, 10414 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10415 AllArgs.size()), 10416 Proto, Loc); 10417 10418 return Invalid; 10419} 10420 10421static inline bool 10422CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10423 const FunctionDecl *FnDecl) { 10424 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10425 if (isa<NamespaceDecl>(DC)) { 10426 return SemaRef.Diag(FnDecl->getLocation(), 10427 diag::err_operator_new_delete_declared_in_namespace) 10428 << FnDecl->getDeclName(); 10429 } 10430 10431 if (isa<TranslationUnitDecl>(DC) && 10432 FnDecl->getStorageClass() == SC_Static) { 10433 return SemaRef.Diag(FnDecl->getLocation(), 10434 diag::err_operator_new_delete_declared_static) 10435 << FnDecl->getDeclName(); 10436 } 10437 10438 return false; 10439} 10440 10441static inline bool 10442CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10443 CanQualType ExpectedResultType, 10444 CanQualType ExpectedFirstParamType, 10445 unsigned DependentParamTypeDiag, 10446 unsigned InvalidParamTypeDiag) { 10447 QualType ResultType = 10448 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10449 10450 // Check that the result type is not dependent. 10451 if (ResultType->isDependentType()) 10452 return SemaRef.Diag(FnDecl->getLocation(), 10453 diag::err_operator_new_delete_dependent_result_type) 10454 << FnDecl->getDeclName() << ExpectedResultType; 10455 10456 // Check that the result type is what we expect. 10457 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10458 return SemaRef.Diag(FnDecl->getLocation(), 10459 diag::err_operator_new_delete_invalid_result_type) 10460 << FnDecl->getDeclName() << ExpectedResultType; 10461 10462 // A function template must have at least 2 parameters. 10463 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10464 return SemaRef.Diag(FnDecl->getLocation(), 10465 diag::err_operator_new_delete_template_too_few_parameters) 10466 << FnDecl->getDeclName(); 10467 10468 // The function decl must have at least 1 parameter. 10469 if (FnDecl->getNumParams() == 0) 10470 return SemaRef.Diag(FnDecl->getLocation(), 10471 diag::err_operator_new_delete_too_few_parameters) 10472 << FnDecl->getDeclName(); 10473 10474 // Check the first parameter type is not dependent. 10475 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10476 if (FirstParamType->isDependentType()) 10477 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10478 << FnDecl->getDeclName() << ExpectedFirstParamType; 10479 10480 // Check that the first parameter type is what we expect. 10481 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10482 ExpectedFirstParamType) 10483 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10484 << FnDecl->getDeclName() << ExpectedFirstParamType; 10485 10486 return false; 10487} 10488 10489static bool 10490CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10491 // C++ [basic.stc.dynamic.allocation]p1: 10492 // A program is ill-formed if an allocation function is declared in a 10493 // namespace scope other than global scope or declared static in global 10494 // scope. 10495 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10496 return true; 10497 10498 CanQualType SizeTy = 10499 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10500 10501 // C++ [basic.stc.dynamic.allocation]p1: 10502 // The return type shall be void*. The first parameter shall have type 10503 // std::size_t. 10504 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10505 SizeTy, 10506 diag::err_operator_new_dependent_param_type, 10507 diag::err_operator_new_param_type)) 10508 return true; 10509 10510 // C++ [basic.stc.dynamic.allocation]p1: 10511 // The first parameter shall not have an associated default argument. 10512 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10513 return SemaRef.Diag(FnDecl->getLocation(), 10514 diag::err_operator_new_default_arg) 10515 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10516 10517 return false; 10518} 10519 10520static bool 10521CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10522 // C++ [basic.stc.dynamic.deallocation]p1: 10523 // A program is ill-formed if deallocation functions are declared in a 10524 // namespace scope other than global scope or declared static in global 10525 // scope. 10526 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10527 return true; 10528 10529 // C++ [basic.stc.dynamic.deallocation]p2: 10530 // Each deallocation function shall return void and its first parameter 10531 // shall be void*. 10532 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10533 SemaRef.Context.VoidPtrTy, 10534 diag::err_operator_delete_dependent_param_type, 10535 diag::err_operator_delete_param_type)) 10536 return true; 10537 10538 return false; 10539} 10540 10541/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10542/// of this overloaded operator is well-formed. If so, returns false; 10543/// otherwise, emits appropriate diagnostics and returns true. 10544bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10545 assert(FnDecl && FnDecl->isOverloadedOperator() && 10546 "Expected an overloaded operator declaration"); 10547 10548 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10549 10550 // C++ [over.oper]p5: 10551 // The allocation and deallocation functions, operator new, 10552 // operator new[], operator delete and operator delete[], are 10553 // described completely in 3.7.3. The attributes and restrictions 10554 // found in the rest of this subclause do not apply to them unless 10555 // explicitly stated in 3.7.3. 10556 if (Op == OO_Delete || Op == OO_Array_Delete) 10557 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10558 10559 if (Op == OO_New || Op == OO_Array_New) 10560 return CheckOperatorNewDeclaration(*this, FnDecl); 10561 10562 // C++ [over.oper]p6: 10563 // An operator function shall either be a non-static member 10564 // function or be a non-member function and have at least one 10565 // parameter whose type is a class, a reference to a class, an 10566 // enumeration, or a reference to an enumeration. 10567 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10568 if (MethodDecl->isStatic()) 10569 return Diag(FnDecl->getLocation(), 10570 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10571 } else { 10572 bool ClassOrEnumParam = false; 10573 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10574 ParamEnd = FnDecl->param_end(); 10575 Param != ParamEnd; ++Param) { 10576 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10577 if (ParamType->isDependentType() || ParamType->isRecordType() || 10578 ParamType->isEnumeralType()) { 10579 ClassOrEnumParam = true; 10580 break; 10581 } 10582 } 10583 10584 if (!ClassOrEnumParam) 10585 return Diag(FnDecl->getLocation(), 10586 diag::err_operator_overload_needs_class_or_enum) 10587 << FnDecl->getDeclName(); 10588 } 10589 10590 // C++ [over.oper]p8: 10591 // An operator function cannot have default arguments (8.3.6), 10592 // except where explicitly stated below. 10593 // 10594 // Only the function-call operator allows default arguments 10595 // (C++ [over.call]p1). 10596 if (Op != OO_Call) { 10597 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10598 Param != FnDecl->param_end(); ++Param) { 10599 if ((*Param)->hasDefaultArg()) 10600 return Diag((*Param)->getLocation(), 10601 diag::err_operator_overload_default_arg) 10602 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10603 } 10604 } 10605 10606 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10607 { false, false, false } 10608#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10609 , { Unary, Binary, MemberOnly } 10610#include "clang/Basic/OperatorKinds.def" 10611 }; 10612 10613 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10614 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10615 bool MustBeMemberOperator = OperatorUses[Op][2]; 10616 10617 // C++ [over.oper]p8: 10618 // [...] Operator functions cannot have more or fewer parameters 10619 // than the number required for the corresponding operator, as 10620 // described in the rest of this subclause. 10621 unsigned NumParams = FnDecl->getNumParams() 10622 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10623 if (Op != OO_Call && 10624 ((NumParams == 1 && !CanBeUnaryOperator) || 10625 (NumParams == 2 && !CanBeBinaryOperator) || 10626 (NumParams < 1) || (NumParams > 2))) { 10627 // We have the wrong number of parameters. 10628 unsigned ErrorKind; 10629 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10630 ErrorKind = 2; // 2 -> unary or binary. 10631 } else if (CanBeUnaryOperator) { 10632 ErrorKind = 0; // 0 -> unary 10633 } else { 10634 assert(CanBeBinaryOperator && 10635 "All non-call overloaded operators are unary or binary!"); 10636 ErrorKind = 1; // 1 -> binary 10637 } 10638 10639 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10640 << FnDecl->getDeclName() << NumParams << ErrorKind; 10641 } 10642 10643 // Overloaded operators other than operator() cannot be variadic. 10644 if (Op != OO_Call && 10645 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10646 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10647 << FnDecl->getDeclName(); 10648 } 10649 10650 // Some operators must be non-static member functions. 10651 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10652 return Diag(FnDecl->getLocation(), 10653 diag::err_operator_overload_must_be_member) 10654 << FnDecl->getDeclName(); 10655 } 10656 10657 // C++ [over.inc]p1: 10658 // The user-defined function called operator++ implements the 10659 // prefix and postfix ++ operator. If this function is a member 10660 // function with no parameters, or a non-member function with one 10661 // parameter of class or enumeration type, it defines the prefix 10662 // increment operator ++ for objects of that type. If the function 10663 // is a member function with one parameter (which shall be of type 10664 // int) or a non-member function with two parameters (the second 10665 // of which shall be of type int), it defines the postfix 10666 // increment operator ++ for objects of that type. 10667 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10668 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10669 bool ParamIsInt = false; 10670 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10671 ParamIsInt = BT->getKind() == BuiltinType::Int; 10672 10673 if (!ParamIsInt) 10674 return Diag(LastParam->getLocation(), 10675 diag::err_operator_overload_post_incdec_must_be_int) 10676 << LastParam->getType() << (Op == OO_MinusMinus); 10677 } 10678 10679 return false; 10680} 10681 10682/// CheckLiteralOperatorDeclaration - Check whether the declaration 10683/// of this literal operator function is well-formed. If so, returns 10684/// false; otherwise, emits appropriate diagnostics and returns true. 10685bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10686 if (isa<CXXMethodDecl>(FnDecl)) { 10687 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10688 << FnDecl->getDeclName(); 10689 return true; 10690 } 10691 10692 if (FnDecl->isExternC()) { 10693 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10694 return true; 10695 } 10696 10697 bool Valid = false; 10698 10699 // This might be the definition of a literal operator template. 10700 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10701 // This might be a specialization of a literal operator template. 10702 if (!TpDecl) 10703 TpDecl = FnDecl->getPrimaryTemplate(); 10704 10705 // template <char...> type operator "" name() is the only valid template 10706 // signature, and the only valid signature with no parameters. 10707 if (TpDecl) { 10708 if (FnDecl->param_size() == 0) { 10709 // Must have only one template parameter 10710 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10711 if (Params->size() == 1) { 10712 NonTypeTemplateParmDecl *PmDecl = 10713 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10714 10715 // The template parameter must be a char parameter pack. 10716 if (PmDecl && PmDecl->isTemplateParameterPack() && 10717 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10718 Valid = true; 10719 } 10720 } 10721 } else if (FnDecl->param_size()) { 10722 // Check the first parameter 10723 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10724 10725 QualType T = (*Param)->getType().getUnqualifiedType(); 10726 10727 // unsigned long long int, long double, and any character type are allowed 10728 // as the only parameters. 10729 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10730 Context.hasSameType(T, Context.LongDoubleTy) || 10731 Context.hasSameType(T, Context.CharTy) || 10732 Context.hasSameType(T, Context.WideCharTy) || 10733 Context.hasSameType(T, Context.Char16Ty) || 10734 Context.hasSameType(T, Context.Char32Ty)) { 10735 if (++Param == FnDecl->param_end()) 10736 Valid = true; 10737 goto FinishedParams; 10738 } 10739 10740 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10741 const PointerType *PT = T->getAs<PointerType>(); 10742 if (!PT) 10743 goto FinishedParams; 10744 T = PT->getPointeeType(); 10745 if (!T.isConstQualified() || T.isVolatileQualified()) 10746 goto FinishedParams; 10747 T = T.getUnqualifiedType(); 10748 10749 // Move on to the second parameter; 10750 ++Param; 10751 10752 // If there is no second parameter, the first must be a const char * 10753 if (Param == FnDecl->param_end()) { 10754 if (Context.hasSameType(T, Context.CharTy)) 10755 Valid = true; 10756 goto FinishedParams; 10757 } 10758 10759 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10760 // are allowed as the first parameter to a two-parameter function 10761 if (!(Context.hasSameType(T, Context.CharTy) || 10762 Context.hasSameType(T, Context.WideCharTy) || 10763 Context.hasSameType(T, Context.Char16Ty) || 10764 Context.hasSameType(T, Context.Char32Ty))) 10765 goto FinishedParams; 10766 10767 // The second and final parameter must be an std::size_t 10768 T = (*Param)->getType().getUnqualifiedType(); 10769 if (Context.hasSameType(T, Context.getSizeType()) && 10770 ++Param == FnDecl->param_end()) 10771 Valid = true; 10772 } 10773 10774 // FIXME: This diagnostic is absolutely terrible. 10775FinishedParams: 10776 if (!Valid) { 10777 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10778 << FnDecl->getDeclName(); 10779 return true; 10780 } 10781 10782 // A parameter-declaration-clause containing a default argument is not 10783 // equivalent to any of the permitted forms. 10784 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10785 ParamEnd = FnDecl->param_end(); 10786 Param != ParamEnd; ++Param) { 10787 if ((*Param)->hasDefaultArg()) { 10788 Diag((*Param)->getDefaultArgRange().getBegin(), 10789 diag::err_literal_operator_default_argument) 10790 << (*Param)->getDefaultArgRange(); 10791 break; 10792 } 10793 } 10794 10795 StringRef LiteralName 10796 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10797 if (LiteralName[0] != '_') { 10798 // C++11 [usrlit.suffix]p1: 10799 // Literal suffix identifiers that do not start with an underscore 10800 // are reserved for future standardization. 10801 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) 10802 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); 10803 } 10804 10805 return false; 10806} 10807 10808/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10809/// linkage specification, including the language and (if present) 10810/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10811/// the location of the language string literal, which is provided 10812/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10813/// the '{' brace. Otherwise, this linkage specification does not 10814/// have any braces. 10815Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10816 SourceLocation LangLoc, 10817 StringRef Lang, 10818 SourceLocation LBraceLoc) { 10819 LinkageSpecDecl::LanguageIDs Language; 10820 if (Lang == "\"C\"") 10821 Language = LinkageSpecDecl::lang_c; 10822 else if (Lang == "\"C++\"") 10823 Language = LinkageSpecDecl::lang_cxx; 10824 else { 10825 Diag(LangLoc, diag::err_bad_language); 10826 return 0; 10827 } 10828 10829 // FIXME: Add all the various semantics of linkage specifications 10830 10831 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10832 ExternLoc, LangLoc, Language, 10833 LBraceLoc.isValid()); 10834 CurContext->addDecl(D); 10835 PushDeclContext(S, D); 10836 return D; 10837} 10838 10839/// ActOnFinishLinkageSpecification - Complete the definition of 10840/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10841/// valid, it's the position of the closing '}' brace in a linkage 10842/// specification that uses braces. 10843Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10844 Decl *LinkageSpec, 10845 SourceLocation RBraceLoc) { 10846 if (LinkageSpec) { 10847 if (RBraceLoc.isValid()) { 10848 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10849 LSDecl->setRBraceLoc(RBraceLoc); 10850 } 10851 PopDeclContext(); 10852 } 10853 return LinkageSpec; 10854} 10855 10856Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10857 AttributeList *AttrList, 10858 SourceLocation SemiLoc) { 10859 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10860 // Attribute declarations appertain to empty declaration so we handle 10861 // them here. 10862 if (AttrList) 10863 ProcessDeclAttributeList(S, ED, AttrList); 10864 10865 CurContext->addDecl(ED); 10866 return ED; 10867} 10868 10869/// \brief Perform semantic analysis for the variable declaration that 10870/// occurs within a C++ catch clause, returning the newly-created 10871/// variable. 10872VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10873 TypeSourceInfo *TInfo, 10874 SourceLocation StartLoc, 10875 SourceLocation Loc, 10876 IdentifierInfo *Name) { 10877 bool Invalid = false; 10878 QualType ExDeclType = TInfo->getType(); 10879 10880 // Arrays and functions decay. 10881 if (ExDeclType->isArrayType()) 10882 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10883 else if (ExDeclType->isFunctionType()) 10884 ExDeclType = Context.getPointerType(ExDeclType); 10885 10886 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10887 // The exception-declaration shall not denote a pointer or reference to an 10888 // incomplete type, other than [cv] void*. 10889 // N2844 forbids rvalue references. 10890 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10891 Diag(Loc, diag::err_catch_rvalue_ref); 10892 Invalid = true; 10893 } 10894 10895 QualType BaseType = ExDeclType; 10896 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10897 unsigned DK = diag::err_catch_incomplete; 10898 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10899 BaseType = Ptr->getPointeeType(); 10900 Mode = 1; 10901 DK = diag::err_catch_incomplete_ptr; 10902 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10903 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10904 BaseType = Ref->getPointeeType(); 10905 Mode = 2; 10906 DK = diag::err_catch_incomplete_ref; 10907 } 10908 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10909 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10910 Invalid = true; 10911 10912 if (!Invalid && !ExDeclType->isDependentType() && 10913 RequireNonAbstractType(Loc, ExDeclType, 10914 diag::err_abstract_type_in_decl, 10915 AbstractVariableType)) 10916 Invalid = true; 10917 10918 // Only the non-fragile NeXT runtime currently supports C++ catches 10919 // of ObjC types, and no runtime supports catching ObjC types by value. 10920 if (!Invalid && getLangOpts().ObjC1) { 10921 QualType T = ExDeclType; 10922 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10923 T = RT->getPointeeType(); 10924 10925 if (T->isObjCObjectType()) { 10926 Diag(Loc, diag::err_objc_object_catch); 10927 Invalid = true; 10928 } else if (T->isObjCObjectPointerType()) { 10929 // FIXME: should this be a test for macosx-fragile specifically? 10930 if (getLangOpts().ObjCRuntime.isFragile()) 10931 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10932 } 10933 } 10934 10935 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10936 ExDeclType, TInfo, SC_None); 10937 ExDecl->setExceptionVariable(true); 10938 10939 // In ARC, infer 'retaining' for variables of retainable type. 10940 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10941 Invalid = true; 10942 10943 if (!Invalid && !ExDeclType->isDependentType()) { 10944 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10945 // Insulate this from anything else we might currently be parsing. 10946 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10947 10948 // C++ [except.handle]p16: 10949 // The object declared in an exception-declaration or, if the 10950 // exception-declaration does not specify a name, a temporary (12.2) is 10951 // copy-initialized (8.5) from the exception object. [...] 10952 // The object is destroyed when the handler exits, after the destruction 10953 // of any automatic objects initialized within the handler. 10954 // 10955 // We just pretend to initialize the object with itself, then make sure 10956 // it can be destroyed later. 10957 QualType initType = ExDeclType; 10958 10959 InitializedEntity entity = 10960 InitializedEntity::InitializeVariable(ExDecl); 10961 InitializationKind initKind = 10962 InitializationKind::CreateCopy(Loc, SourceLocation()); 10963 10964 Expr *opaqueValue = 10965 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10966 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 10967 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 10968 if (result.isInvalid()) 10969 Invalid = true; 10970 else { 10971 // If the constructor used was non-trivial, set this as the 10972 // "initializer". 10973 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10974 if (!construct->getConstructor()->isTrivial()) { 10975 Expr *init = MaybeCreateExprWithCleanups(construct); 10976 ExDecl->setInit(init); 10977 } 10978 10979 // And make sure it's destructable. 10980 FinalizeVarWithDestructor(ExDecl, recordType); 10981 } 10982 } 10983 } 10984 10985 if (Invalid) 10986 ExDecl->setInvalidDecl(); 10987 10988 return ExDecl; 10989} 10990 10991/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10992/// handler. 10993Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10994 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10995 bool Invalid = D.isInvalidType(); 10996 10997 // Check for unexpanded parameter packs. 10998 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10999 UPPC_ExceptionType)) { 11000 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 11001 D.getIdentifierLoc()); 11002 Invalid = true; 11003 } 11004 11005 IdentifierInfo *II = D.getIdentifier(); 11006 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 11007 LookupOrdinaryName, 11008 ForRedeclaration)) { 11009 // The scope should be freshly made just for us. There is just no way 11010 // it contains any previous declaration. 11011 assert(!S->isDeclScope(PrevDecl)); 11012 if (PrevDecl->isTemplateParameter()) { 11013 // Maybe we will complain about the shadowed template parameter. 11014 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 11015 PrevDecl = 0; 11016 } 11017 } 11018 11019 if (D.getCXXScopeSpec().isSet() && !Invalid) { 11020 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 11021 << D.getCXXScopeSpec().getRange(); 11022 Invalid = true; 11023 } 11024 11025 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 11026 D.getLocStart(), 11027 D.getIdentifierLoc(), 11028 D.getIdentifier()); 11029 if (Invalid) 11030 ExDecl->setInvalidDecl(); 11031 11032 // Add the exception declaration into this scope. 11033 if (II) 11034 PushOnScopeChains(ExDecl, S); 11035 else 11036 CurContext->addDecl(ExDecl); 11037 11038 ProcessDeclAttributes(S, ExDecl, D); 11039 return ExDecl; 11040} 11041 11042Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11043 Expr *AssertExpr, 11044 Expr *AssertMessageExpr, 11045 SourceLocation RParenLoc) { 11046 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 11047 11048 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 11049 return 0; 11050 11051 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 11052 AssertMessage, RParenLoc, false); 11053} 11054 11055Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11056 Expr *AssertExpr, 11057 StringLiteral *AssertMessage, 11058 SourceLocation RParenLoc, 11059 bool Failed) { 11060 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 11061 !Failed) { 11062 // In a static_assert-declaration, the constant-expression shall be a 11063 // constant expression that can be contextually converted to bool. 11064 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 11065 if (Converted.isInvalid()) 11066 Failed = true; 11067 11068 llvm::APSInt Cond; 11069 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 11070 diag::err_static_assert_expression_is_not_constant, 11071 /*AllowFold=*/false).isInvalid()) 11072 Failed = true; 11073 11074 if (!Failed && !Cond) { 11075 SmallString<256> MsgBuffer; 11076 llvm::raw_svector_ostream Msg(MsgBuffer); 11077 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 11078 Diag(StaticAssertLoc, diag::err_static_assert_failed) 11079 << Msg.str() << AssertExpr->getSourceRange(); 11080 Failed = true; 11081 } 11082 } 11083 11084 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 11085 AssertExpr, AssertMessage, RParenLoc, 11086 Failed); 11087 11088 CurContext->addDecl(Decl); 11089 return Decl; 11090} 11091 11092/// \brief Perform semantic analysis of the given friend type declaration. 11093/// 11094/// \returns A friend declaration that. 11095FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 11096 SourceLocation FriendLoc, 11097 TypeSourceInfo *TSInfo) { 11098 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 11099 11100 QualType T = TSInfo->getType(); 11101 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 11102 11103 // C++03 [class.friend]p2: 11104 // An elaborated-type-specifier shall be used in a friend declaration 11105 // for a class.* 11106 // 11107 // * The class-key of the elaborated-type-specifier is required. 11108 if (!ActiveTemplateInstantiations.empty()) { 11109 // Do not complain about the form of friend template types during 11110 // template instantiation; we will already have complained when the 11111 // template was declared. 11112 } else { 11113 if (!T->isElaboratedTypeSpecifier()) { 11114 // If we evaluated the type to a record type, suggest putting 11115 // a tag in front. 11116 if (const RecordType *RT = T->getAs<RecordType>()) { 11117 RecordDecl *RD = RT->getDecl(); 11118 11119 std::string InsertionText = std::string(" ") + RD->getKindName(); 11120 11121 Diag(TypeRange.getBegin(), 11122 getLangOpts().CPlusPlus11 ? 11123 diag::warn_cxx98_compat_unelaborated_friend_type : 11124 diag::ext_unelaborated_friend_type) 11125 << (unsigned) RD->getTagKind() 11126 << T 11127 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 11128 InsertionText); 11129 } else { 11130 Diag(FriendLoc, 11131 getLangOpts().CPlusPlus11 ? 11132 diag::warn_cxx98_compat_nonclass_type_friend : 11133 diag::ext_nonclass_type_friend) 11134 << T 11135 << TypeRange; 11136 } 11137 } else if (T->getAs<EnumType>()) { 11138 Diag(FriendLoc, 11139 getLangOpts().CPlusPlus11 ? 11140 diag::warn_cxx98_compat_enum_friend : 11141 diag::ext_enum_friend) 11142 << T 11143 << TypeRange; 11144 } 11145 11146 // C++11 [class.friend]p3: 11147 // A friend declaration that does not declare a function shall have one 11148 // of the following forms: 11149 // friend elaborated-type-specifier ; 11150 // friend simple-type-specifier ; 11151 // friend typename-specifier ; 11152 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 11153 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 11154 } 11155 11156 // If the type specifier in a friend declaration designates a (possibly 11157 // cv-qualified) class type, that class is declared as a friend; otherwise, 11158 // the friend declaration is ignored. 11159 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 11160} 11161 11162/// Handle a friend tag declaration where the scope specifier was 11163/// templated. 11164Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 11165 unsigned TagSpec, SourceLocation TagLoc, 11166 CXXScopeSpec &SS, 11167 IdentifierInfo *Name, 11168 SourceLocation NameLoc, 11169 AttributeList *Attr, 11170 MultiTemplateParamsArg TempParamLists) { 11171 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 11172 11173 bool isExplicitSpecialization = false; 11174 bool Invalid = false; 11175 11176 if (TemplateParameterList *TemplateParams = 11177 MatchTemplateParametersToScopeSpecifier( 11178 TagLoc, NameLoc, SS, TempParamLists, /*friend*/ true, 11179 isExplicitSpecialization, Invalid)) { 11180 if (TemplateParams->size() > 0) { 11181 // This is a declaration of a class template. 11182 if (Invalid) 11183 return 0; 11184 11185 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 11186 SS, Name, NameLoc, Attr, 11187 TemplateParams, AS_public, 11188 /*ModulePrivateLoc=*/SourceLocation(), 11189 TempParamLists.size() - 1, 11190 TempParamLists.data()).take(); 11191 } else { 11192 // The "template<>" header is extraneous. 11193 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 11194 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 11195 isExplicitSpecialization = true; 11196 } 11197 } 11198 11199 if (Invalid) return 0; 11200 11201 bool isAllExplicitSpecializations = true; 11202 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 11203 if (TempParamLists[I]->size()) { 11204 isAllExplicitSpecializations = false; 11205 break; 11206 } 11207 } 11208 11209 // FIXME: don't ignore attributes. 11210 11211 // If it's explicit specializations all the way down, just forget 11212 // about the template header and build an appropriate non-templated 11213 // friend. TODO: for source fidelity, remember the headers. 11214 if (isAllExplicitSpecializations) { 11215 if (SS.isEmpty()) { 11216 bool Owned = false; 11217 bool IsDependent = false; 11218 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 11219 Attr, AS_public, 11220 /*ModulePrivateLoc=*/SourceLocation(), 11221 MultiTemplateParamsArg(), Owned, IsDependent, 11222 /*ScopedEnumKWLoc=*/SourceLocation(), 11223 /*ScopedEnumUsesClassTag=*/false, 11224 /*UnderlyingType=*/TypeResult()); 11225 } 11226 11227 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 11228 ElaboratedTypeKeyword Keyword 11229 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11230 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 11231 *Name, NameLoc); 11232 if (T.isNull()) 11233 return 0; 11234 11235 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11236 if (isa<DependentNameType>(T)) { 11237 DependentNameTypeLoc TL = 11238 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11239 TL.setElaboratedKeywordLoc(TagLoc); 11240 TL.setQualifierLoc(QualifierLoc); 11241 TL.setNameLoc(NameLoc); 11242 } else { 11243 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 11244 TL.setElaboratedKeywordLoc(TagLoc); 11245 TL.setQualifierLoc(QualifierLoc); 11246 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 11247 } 11248 11249 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11250 TSI, FriendLoc, TempParamLists); 11251 Friend->setAccess(AS_public); 11252 CurContext->addDecl(Friend); 11253 return Friend; 11254 } 11255 11256 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11257 11258 11259 11260 // Handle the case of a templated-scope friend class. e.g. 11261 // template <class T> class A<T>::B; 11262 // FIXME: we don't support these right now. 11263 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11264 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11265 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11266 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11267 TL.setElaboratedKeywordLoc(TagLoc); 11268 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11269 TL.setNameLoc(NameLoc); 11270 11271 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11272 TSI, FriendLoc, TempParamLists); 11273 Friend->setAccess(AS_public); 11274 Friend->setUnsupportedFriend(true); 11275 CurContext->addDecl(Friend); 11276 return Friend; 11277} 11278 11279 11280/// Handle a friend type declaration. This works in tandem with 11281/// ActOnTag. 11282/// 11283/// Notes on friend class templates: 11284/// 11285/// We generally treat friend class declarations as if they were 11286/// declaring a class. So, for example, the elaborated type specifier 11287/// in a friend declaration is required to obey the restrictions of a 11288/// class-head (i.e. no typedefs in the scope chain), template 11289/// parameters are required to match up with simple template-ids, &c. 11290/// However, unlike when declaring a template specialization, it's 11291/// okay to refer to a template specialization without an empty 11292/// template parameter declaration, e.g. 11293/// friend class A<T>::B<unsigned>; 11294/// We permit this as a special case; if there are any template 11295/// parameters present at all, require proper matching, i.e. 11296/// template <> template \<class T> friend class A<int>::B; 11297Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11298 MultiTemplateParamsArg TempParams) { 11299 SourceLocation Loc = DS.getLocStart(); 11300 11301 assert(DS.isFriendSpecified()); 11302 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11303 11304 // Try to convert the decl specifier to a type. This works for 11305 // friend templates because ActOnTag never produces a ClassTemplateDecl 11306 // for a TUK_Friend. 11307 Declarator TheDeclarator(DS, Declarator::MemberContext); 11308 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11309 QualType T = TSI->getType(); 11310 if (TheDeclarator.isInvalidType()) 11311 return 0; 11312 11313 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11314 return 0; 11315 11316 // This is definitely an error in C++98. It's probably meant to 11317 // be forbidden in C++0x, too, but the specification is just 11318 // poorly written. 11319 // 11320 // The problem is with declarations like the following: 11321 // template <T> friend A<T>::foo; 11322 // where deciding whether a class C is a friend or not now hinges 11323 // on whether there exists an instantiation of A that causes 11324 // 'foo' to equal C. There are restrictions on class-heads 11325 // (which we declare (by fiat) elaborated friend declarations to 11326 // be) that makes this tractable. 11327 // 11328 // FIXME: handle "template <> friend class A<T>;", which 11329 // is possibly well-formed? Who even knows? 11330 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11331 Diag(Loc, diag::err_tagless_friend_type_template) 11332 << DS.getSourceRange(); 11333 return 0; 11334 } 11335 11336 // C++98 [class.friend]p1: A friend of a class is a function 11337 // or class that is not a member of the class . . . 11338 // This is fixed in DR77, which just barely didn't make the C++03 11339 // deadline. It's also a very silly restriction that seriously 11340 // affects inner classes and which nobody else seems to implement; 11341 // thus we never diagnose it, not even in -pedantic. 11342 // 11343 // But note that we could warn about it: it's always useless to 11344 // friend one of your own members (it's not, however, worthless to 11345 // friend a member of an arbitrary specialization of your template). 11346 11347 Decl *D; 11348 if (unsigned NumTempParamLists = TempParams.size()) 11349 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11350 NumTempParamLists, 11351 TempParams.data(), 11352 TSI, 11353 DS.getFriendSpecLoc()); 11354 else 11355 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11356 11357 if (!D) 11358 return 0; 11359 11360 D->setAccess(AS_public); 11361 CurContext->addDecl(D); 11362 11363 return D; 11364} 11365 11366NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11367 MultiTemplateParamsArg TemplateParams) { 11368 const DeclSpec &DS = D.getDeclSpec(); 11369 11370 assert(DS.isFriendSpecified()); 11371 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11372 11373 SourceLocation Loc = D.getIdentifierLoc(); 11374 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11375 11376 // C++ [class.friend]p1 11377 // A friend of a class is a function or class.... 11378 // Note that this sees through typedefs, which is intended. 11379 // It *doesn't* see through dependent types, which is correct 11380 // according to [temp.arg.type]p3: 11381 // If a declaration acquires a function type through a 11382 // type dependent on a template-parameter and this causes 11383 // a declaration that does not use the syntactic form of a 11384 // function declarator to have a function type, the program 11385 // is ill-formed. 11386 if (!TInfo->getType()->isFunctionType()) { 11387 Diag(Loc, diag::err_unexpected_friend); 11388 11389 // It might be worthwhile to try to recover by creating an 11390 // appropriate declaration. 11391 return 0; 11392 } 11393 11394 // C++ [namespace.memdef]p3 11395 // - If a friend declaration in a non-local class first declares a 11396 // class or function, the friend class or function is a member 11397 // of the innermost enclosing namespace. 11398 // - The name of the friend is not found by simple name lookup 11399 // until a matching declaration is provided in that namespace 11400 // scope (either before or after the class declaration granting 11401 // friendship). 11402 // - If a friend function is called, its name may be found by the 11403 // name lookup that considers functions from namespaces and 11404 // classes associated with the types of the function arguments. 11405 // - When looking for a prior declaration of a class or a function 11406 // declared as a friend, scopes outside the innermost enclosing 11407 // namespace scope are not considered. 11408 11409 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11410 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11411 DeclarationName Name = NameInfo.getName(); 11412 assert(Name); 11413 11414 // Check for unexpanded parameter packs. 11415 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11416 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11417 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11418 return 0; 11419 11420 // The context we found the declaration in, or in which we should 11421 // create the declaration. 11422 DeclContext *DC; 11423 Scope *DCScope = S; 11424 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11425 ForRedeclaration); 11426 11427 // There are five cases here. 11428 // - There's no scope specifier and we're in a local class. Only look 11429 // for functions declared in the immediately-enclosing block scope. 11430 // We recover from invalid scope qualifiers as if they just weren't there. 11431 FunctionDecl *FunctionContainingLocalClass = 0; 11432 if ((SS.isInvalid() || !SS.isSet()) && 11433 (FunctionContainingLocalClass = 11434 cast<CXXRecordDecl>(CurContext)->isLocalClass())) { 11435 // C++11 [class.friend]p11: 11436 // If a friend declaration appears in a local class and the name 11437 // specified is an unqualified name, a prior declaration is 11438 // looked up without considering scopes that are outside the 11439 // innermost enclosing non-class scope. For a friend function 11440 // declaration, if there is no prior declaration, the program is 11441 // ill-formed. 11442 11443 // Find the innermost enclosing non-class scope. This is the block 11444 // scope containing the local class definition (or for a nested class, 11445 // the outer local class). 11446 DCScope = S->getFnParent(); 11447 11448 // Look up the function name in the scope. 11449 Previous.clear(LookupLocalFriendName); 11450 LookupName(Previous, S, /*AllowBuiltinCreation*/false); 11451 11452 if (!Previous.empty()) { 11453 // All possible previous declarations must have the same context: 11454 // either they were declared at block scope or they are members of 11455 // one of the enclosing local classes. 11456 DC = Previous.getRepresentativeDecl()->getDeclContext(); 11457 } else { 11458 // This is ill-formed, but provide the context that we would have 11459 // declared the function in, if we were permitted to, for error recovery. 11460 DC = FunctionContainingLocalClass; 11461 } 11462 11463 // C++ [class.friend]p6: 11464 // A function can be defined in a friend declaration of a class if and 11465 // only if the class is a non-local class (9.8), the function name is 11466 // unqualified, and the function has namespace scope. 11467 if (D.isFunctionDefinition()) { 11468 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11469 } 11470 11471 // - There's no scope specifier, in which case we just go to the 11472 // appropriate scope and look for a function or function template 11473 // there as appropriate. 11474 } else if (SS.isInvalid() || !SS.isSet()) { 11475 // C++11 [namespace.memdef]p3: 11476 // If the name in a friend declaration is neither qualified nor 11477 // a template-id and the declaration is a function or an 11478 // elaborated-type-specifier, the lookup to determine whether 11479 // the entity has been previously declared shall not consider 11480 // any scopes outside the innermost enclosing namespace. 11481 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11482 11483 // Find the appropriate context according to the above. 11484 DC = CurContext; 11485 11486 // Skip class contexts. If someone can cite chapter and verse 11487 // for this behavior, that would be nice --- it's what GCC and 11488 // EDG do, and it seems like a reasonable intent, but the spec 11489 // really only says that checks for unqualified existing 11490 // declarations should stop at the nearest enclosing namespace, 11491 // not that they should only consider the nearest enclosing 11492 // namespace. 11493 while (DC->isRecord()) 11494 DC = DC->getParent(); 11495 11496 DeclContext *LookupDC = DC; 11497 while (LookupDC->isTransparentContext()) 11498 LookupDC = LookupDC->getParent(); 11499 11500 while (true) { 11501 LookupQualifiedName(Previous, LookupDC); 11502 11503 if (!Previous.empty()) { 11504 DC = LookupDC; 11505 break; 11506 } 11507 11508 if (isTemplateId) { 11509 if (isa<TranslationUnitDecl>(LookupDC)) break; 11510 } else { 11511 if (LookupDC->isFileContext()) break; 11512 } 11513 LookupDC = LookupDC->getParent(); 11514 } 11515 11516 DCScope = getScopeForDeclContext(S, DC); 11517 11518 // - There's a non-dependent scope specifier, in which case we 11519 // compute it and do a previous lookup there for a function 11520 // or function template. 11521 } else if (!SS.getScopeRep()->isDependent()) { 11522 DC = computeDeclContext(SS); 11523 if (!DC) return 0; 11524 11525 if (RequireCompleteDeclContext(SS, DC)) return 0; 11526 11527 LookupQualifiedName(Previous, DC); 11528 11529 // Ignore things found implicitly in the wrong scope. 11530 // TODO: better diagnostics for this case. Suggesting the right 11531 // qualified scope would be nice... 11532 LookupResult::Filter F = Previous.makeFilter(); 11533 while (F.hasNext()) { 11534 NamedDecl *D = F.next(); 11535 if (!DC->InEnclosingNamespaceSetOf( 11536 D->getDeclContext()->getRedeclContext())) 11537 F.erase(); 11538 } 11539 F.done(); 11540 11541 if (Previous.empty()) { 11542 D.setInvalidType(); 11543 Diag(Loc, diag::err_qualified_friend_not_found) 11544 << Name << TInfo->getType(); 11545 return 0; 11546 } 11547 11548 // C++ [class.friend]p1: A friend of a class is a function or 11549 // class that is not a member of the class . . . 11550 if (DC->Equals(CurContext)) 11551 Diag(DS.getFriendSpecLoc(), 11552 getLangOpts().CPlusPlus11 ? 11553 diag::warn_cxx98_compat_friend_is_member : 11554 diag::err_friend_is_member); 11555 11556 if (D.isFunctionDefinition()) { 11557 // C++ [class.friend]p6: 11558 // A function can be defined in a friend declaration of a class if and 11559 // only if the class is a non-local class (9.8), the function name is 11560 // unqualified, and the function has namespace scope. 11561 SemaDiagnosticBuilder DB 11562 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11563 11564 DB << SS.getScopeRep(); 11565 if (DC->isFileContext()) 11566 DB << FixItHint::CreateRemoval(SS.getRange()); 11567 SS.clear(); 11568 } 11569 11570 // - There's a scope specifier that does not match any template 11571 // parameter lists, in which case we use some arbitrary context, 11572 // create a method or method template, and wait for instantiation. 11573 // - There's a scope specifier that does match some template 11574 // parameter lists, which we don't handle right now. 11575 } else { 11576 if (D.isFunctionDefinition()) { 11577 // C++ [class.friend]p6: 11578 // A function can be defined in a friend declaration of a class if and 11579 // only if the class is a non-local class (9.8), the function name is 11580 // unqualified, and the function has namespace scope. 11581 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11582 << SS.getScopeRep(); 11583 } 11584 11585 DC = CurContext; 11586 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11587 } 11588 11589 if (!DC->isRecord()) { 11590 // This implies that it has to be an operator or function. 11591 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11592 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11593 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11594 Diag(Loc, diag::err_introducing_special_friend) << 11595 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11596 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11597 return 0; 11598 } 11599 } 11600 11601 // FIXME: This is an egregious hack to cope with cases where the scope stack 11602 // does not contain the declaration context, i.e., in an out-of-line 11603 // definition of a class. 11604 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11605 if (!DCScope) { 11606 FakeDCScope.setEntity(DC); 11607 DCScope = &FakeDCScope; 11608 } 11609 11610 bool AddToScope = true; 11611 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11612 TemplateParams, AddToScope); 11613 if (!ND) return 0; 11614 11615 assert(ND->getLexicalDeclContext() == CurContext); 11616 11617 // If we performed typo correction, we might have added a scope specifier 11618 // and changed the decl context. 11619 DC = ND->getDeclContext(); 11620 11621 // Add the function declaration to the appropriate lookup tables, 11622 // adjusting the redeclarations list as necessary. We don't 11623 // want to do this yet if the friending class is dependent. 11624 // 11625 // Also update the scope-based lookup if the target context's 11626 // lookup context is in lexical scope. 11627 if (!CurContext->isDependentContext()) { 11628 DC = DC->getRedeclContext(); 11629 DC->makeDeclVisibleInContext(ND); 11630 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11631 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11632 } 11633 11634 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11635 D.getIdentifierLoc(), ND, 11636 DS.getFriendSpecLoc()); 11637 FrD->setAccess(AS_public); 11638 CurContext->addDecl(FrD); 11639 11640 if (ND->isInvalidDecl()) { 11641 FrD->setInvalidDecl(); 11642 } else { 11643 if (DC->isRecord()) CheckFriendAccess(ND); 11644 11645 FunctionDecl *FD; 11646 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11647 FD = FTD->getTemplatedDecl(); 11648 else 11649 FD = cast<FunctionDecl>(ND); 11650 11651 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a 11652 // default argument expression, that declaration shall be a definition 11653 // and shall be the only declaration of the function or function 11654 // template in the translation unit. 11655 if (functionDeclHasDefaultArgument(FD)) { 11656 if (FunctionDecl *OldFD = FD->getPreviousDecl()) { 11657 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 11658 Diag(OldFD->getLocation(), diag::note_previous_declaration); 11659 } else if (!D.isFunctionDefinition()) 11660 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); 11661 } 11662 11663 // Mark templated-scope function declarations as unsupported. 11664 if (FD->getNumTemplateParameterLists()) 11665 FrD->setUnsupportedFriend(true); 11666 } 11667 11668 return ND; 11669} 11670 11671void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11672 AdjustDeclIfTemplate(Dcl); 11673 11674 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11675 if (!Fn) { 11676 Diag(DelLoc, diag::err_deleted_non_function); 11677 return; 11678 } 11679 11680 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11681 // Don't consider the implicit declaration we generate for explicit 11682 // specializations. FIXME: Do not generate these implicit declarations. 11683 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11684 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11685 Diag(DelLoc, diag::err_deleted_decl_not_first); 11686 Diag(Prev->getLocation(), diag::note_previous_declaration); 11687 } 11688 // If the declaration wasn't the first, we delete the function anyway for 11689 // recovery. 11690 Fn = Fn->getCanonicalDecl(); 11691 } 11692 11693 if (Fn->isDeleted()) 11694 return; 11695 11696 // See if we're deleting a function which is already known to override a 11697 // non-deleted virtual function. 11698 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11699 bool IssuedDiagnostic = false; 11700 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11701 E = MD->end_overridden_methods(); 11702 I != E; ++I) { 11703 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11704 if (!IssuedDiagnostic) { 11705 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11706 IssuedDiagnostic = true; 11707 } 11708 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11709 } 11710 } 11711 } 11712 11713 Fn->setDeletedAsWritten(); 11714} 11715 11716void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11717 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11718 11719 if (MD) { 11720 if (MD->getParent()->isDependentType()) { 11721 MD->setDefaulted(); 11722 MD->setExplicitlyDefaulted(); 11723 return; 11724 } 11725 11726 CXXSpecialMember Member = getSpecialMember(MD); 11727 if (Member == CXXInvalid) { 11728 if (!MD->isInvalidDecl()) 11729 Diag(DefaultLoc, diag::err_default_special_members); 11730 return; 11731 } 11732 11733 MD->setDefaulted(); 11734 MD->setExplicitlyDefaulted(); 11735 11736 // If this definition appears within the record, do the checking when 11737 // the record is complete. 11738 const FunctionDecl *Primary = MD; 11739 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11740 // Find the uninstantiated declaration that actually had the '= default' 11741 // on it. 11742 Pattern->isDefined(Primary); 11743 11744 // If the method was defaulted on its first declaration, we will have 11745 // already performed the checking in CheckCompletedCXXClass. Such a 11746 // declaration doesn't trigger an implicit definition. 11747 if (Primary == Primary->getCanonicalDecl()) 11748 return; 11749 11750 CheckExplicitlyDefaultedSpecialMember(MD); 11751 11752 // The exception specification is needed because we are defining the 11753 // function. 11754 ResolveExceptionSpec(DefaultLoc, 11755 MD->getType()->castAs<FunctionProtoType>()); 11756 11757 if (MD->isInvalidDecl()) 11758 return; 11759 11760 switch (Member) { 11761 case CXXDefaultConstructor: 11762 DefineImplicitDefaultConstructor(DefaultLoc, 11763 cast<CXXConstructorDecl>(MD)); 11764 break; 11765 case CXXCopyConstructor: 11766 DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11767 break; 11768 case CXXCopyAssignment: 11769 DefineImplicitCopyAssignment(DefaultLoc, MD); 11770 break; 11771 case CXXDestructor: 11772 DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); 11773 break; 11774 case CXXMoveConstructor: 11775 DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11776 break; 11777 case CXXMoveAssignment: 11778 DefineImplicitMoveAssignment(DefaultLoc, MD); 11779 break; 11780 case CXXInvalid: 11781 llvm_unreachable("Invalid special member."); 11782 } 11783 } else { 11784 Diag(DefaultLoc, diag::err_default_special_members); 11785 } 11786} 11787 11788static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11789 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11790 Stmt *SubStmt = *CI; 11791 if (!SubStmt) 11792 continue; 11793 if (isa<ReturnStmt>(SubStmt)) 11794 Self.Diag(SubStmt->getLocStart(), 11795 diag::err_return_in_constructor_handler); 11796 if (!isa<Expr>(SubStmt)) 11797 SearchForReturnInStmt(Self, SubStmt); 11798 } 11799} 11800 11801void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11802 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11803 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11804 SearchForReturnInStmt(*this, Handler); 11805 } 11806} 11807 11808bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11809 const CXXMethodDecl *Old) { 11810 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11811 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11812 11813 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11814 11815 // If the calling conventions match, everything is fine 11816 if (NewCC == OldCC) 11817 return false; 11818 11819 Diag(New->getLocation(), 11820 diag::err_conflicting_overriding_cc_attributes) 11821 << New->getDeclName() << New->getType() << Old->getType(); 11822 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11823 return true; 11824} 11825 11826bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11827 const CXXMethodDecl *Old) { 11828 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11829 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11830 11831 if (Context.hasSameType(NewTy, OldTy) || 11832 NewTy->isDependentType() || OldTy->isDependentType()) 11833 return false; 11834 11835 // Check if the return types are covariant 11836 QualType NewClassTy, OldClassTy; 11837 11838 /// Both types must be pointers or references to classes. 11839 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11840 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11841 NewClassTy = NewPT->getPointeeType(); 11842 OldClassTy = OldPT->getPointeeType(); 11843 } 11844 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11845 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11846 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11847 NewClassTy = NewRT->getPointeeType(); 11848 OldClassTy = OldRT->getPointeeType(); 11849 } 11850 } 11851 } 11852 11853 // The return types aren't either both pointers or references to a class type. 11854 if (NewClassTy.isNull()) { 11855 Diag(New->getLocation(), 11856 diag::err_different_return_type_for_overriding_virtual_function) 11857 << New->getDeclName() << NewTy << OldTy; 11858 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11859 11860 return true; 11861 } 11862 11863 // C++ [class.virtual]p6: 11864 // If the return type of D::f differs from the return type of B::f, the 11865 // class type in the return type of D::f shall be complete at the point of 11866 // declaration of D::f or shall be the class type D. 11867 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11868 if (!RT->isBeingDefined() && 11869 RequireCompleteType(New->getLocation(), NewClassTy, 11870 diag::err_covariant_return_incomplete, 11871 New->getDeclName())) 11872 return true; 11873 } 11874 11875 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11876 // Check if the new class derives from the old class. 11877 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11878 Diag(New->getLocation(), 11879 diag::err_covariant_return_not_derived) 11880 << New->getDeclName() << NewTy << OldTy; 11881 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11882 return true; 11883 } 11884 11885 // Check if we the conversion from derived to base is valid. 11886 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11887 diag::err_covariant_return_inaccessible_base, 11888 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11889 // FIXME: Should this point to the return type? 11890 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11891 // FIXME: this note won't trigger for delayed access control 11892 // diagnostics, and it's impossible to get an undelayed error 11893 // here from access control during the original parse because 11894 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11895 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11896 return true; 11897 } 11898 } 11899 11900 // The qualifiers of the return types must be the same. 11901 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11902 Diag(New->getLocation(), 11903 diag::err_covariant_return_type_different_qualifications) 11904 << New->getDeclName() << NewTy << OldTy; 11905 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11906 return true; 11907 }; 11908 11909 11910 // The new class type must have the same or less qualifiers as the old type. 11911 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11912 Diag(New->getLocation(), 11913 diag::err_covariant_return_type_class_type_more_qualified) 11914 << New->getDeclName() << NewTy << OldTy; 11915 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11916 return true; 11917 }; 11918 11919 return false; 11920} 11921 11922/// \brief Mark the given method pure. 11923/// 11924/// \param Method the method to be marked pure. 11925/// 11926/// \param InitRange the source range that covers the "0" initializer. 11927bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11928 SourceLocation EndLoc = InitRange.getEnd(); 11929 if (EndLoc.isValid()) 11930 Method->setRangeEnd(EndLoc); 11931 11932 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11933 Method->setPure(); 11934 return false; 11935 } 11936 11937 if (!Method->isInvalidDecl()) 11938 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11939 << Method->getDeclName() << InitRange; 11940 return true; 11941} 11942 11943/// \brief Determine whether the given declaration is a static data member. 11944static bool isStaticDataMember(const Decl *D) { 11945 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) 11946 return Var->isStaticDataMember(); 11947 11948 return false; 11949} 11950 11951/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11952/// an initializer for the out-of-line declaration 'Dcl'. The scope 11953/// is a fresh scope pushed for just this purpose. 11954/// 11955/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11956/// static data member of class X, names should be looked up in the scope of 11957/// class X. 11958void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11959 // If there is no declaration, there was an error parsing it. 11960 if (D == 0 || D->isInvalidDecl()) return; 11961 11962 // We should only get called for declarations with scope specifiers, like: 11963 // int foo::bar; 11964 assert(D->isOutOfLine()); 11965 EnterDeclaratorContext(S, D->getDeclContext()); 11966 11967 // If we are parsing the initializer for a static data member, push a 11968 // new expression evaluation context that is associated with this static 11969 // data member. 11970 if (isStaticDataMember(D)) 11971 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11972} 11973 11974/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11975/// initializer for the out-of-line declaration 'D'. 11976void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11977 // If there is no declaration, there was an error parsing it. 11978 if (D == 0 || D->isInvalidDecl()) return; 11979 11980 if (isStaticDataMember(D)) 11981 PopExpressionEvaluationContext(); 11982 11983 assert(D->isOutOfLine()); 11984 ExitDeclaratorContext(S); 11985} 11986 11987/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11988/// C++ if/switch/while/for statement. 11989/// e.g: "if (int x = f()) {...}" 11990DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11991 // C++ 6.4p2: 11992 // The declarator shall not specify a function or an array. 11993 // The type-specifier-seq shall not contain typedef and shall not declare a 11994 // new class or enumeration. 11995 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11996 "Parser allowed 'typedef' as storage class of condition decl."); 11997 11998 Decl *Dcl = ActOnDeclarator(S, D); 11999 if (!Dcl) 12000 return true; 12001 12002 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 12003 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 12004 << D.getSourceRange(); 12005 return true; 12006 } 12007 12008 return Dcl; 12009} 12010 12011void Sema::LoadExternalVTableUses() { 12012 if (!ExternalSource) 12013 return; 12014 12015 SmallVector<ExternalVTableUse, 4> VTables; 12016 ExternalSource->ReadUsedVTables(VTables); 12017 SmallVector<VTableUse, 4> NewUses; 12018 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 12019 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 12020 = VTablesUsed.find(VTables[I].Record); 12021 // Even if a definition wasn't required before, it may be required now. 12022 if (Pos != VTablesUsed.end()) { 12023 if (!Pos->second && VTables[I].DefinitionRequired) 12024 Pos->second = true; 12025 continue; 12026 } 12027 12028 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 12029 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 12030 } 12031 12032 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 12033} 12034 12035void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 12036 bool DefinitionRequired) { 12037 // Ignore any vtable uses in unevaluated operands or for classes that do 12038 // not have a vtable. 12039 if (!Class->isDynamicClass() || Class->isDependentContext() || 12040 CurContext->isDependentContext() || isUnevaluatedContext()) 12041 return; 12042 12043 // Try to insert this class into the map. 12044 LoadExternalVTableUses(); 12045 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12046 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 12047 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 12048 if (!Pos.second) { 12049 // If we already had an entry, check to see if we are promoting this vtable 12050 // to required a definition. If so, we need to reappend to the VTableUses 12051 // list, since we may have already processed the first entry. 12052 if (DefinitionRequired && !Pos.first->second) { 12053 Pos.first->second = true; 12054 } else { 12055 // Otherwise, we can early exit. 12056 return; 12057 } 12058 } 12059 12060 // Local classes need to have their virtual members marked 12061 // immediately. For all other classes, we mark their virtual members 12062 // at the end of the translation unit. 12063 if (Class->isLocalClass()) 12064 MarkVirtualMembersReferenced(Loc, Class); 12065 else 12066 VTableUses.push_back(std::make_pair(Class, Loc)); 12067} 12068 12069bool Sema::DefineUsedVTables() { 12070 LoadExternalVTableUses(); 12071 if (VTableUses.empty()) 12072 return false; 12073 12074 // Note: The VTableUses vector could grow as a result of marking 12075 // the members of a class as "used", so we check the size each 12076 // time through the loop and prefer indices (which are stable) to 12077 // iterators (which are not). 12078 bool DefinedAnything = false; 12079 for (unsigned I = 0; I != VTableUses.size(); ++I) { 12080 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 12081 if (!Class) 12082 continue; 12083 12084 SourceLocation Loc = VTableUses[I].second; 12085 12086 bool DefineVTable = true; 12087 12088 // If this class has a key function, but that key function is 12089 // defined in another translation unit, we don't need to emit the 12090 // vtable even though we're using it. 12091 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 12092 if (KeyFunction && !KeyFunction->hasBody()) { 12093 // The key function is in another translation unit. 12094 DefineVTable = false; 12095 TemplateSpecializationKind TSK = 12096 KeyFunction->getTemplateSpecializationKind(); 12097 assert(TSK != TSK_ExplicitInstantiationDefinition && 12098 TSK != TSK_ImplicitInstantiation && 12099 "Instantiations don't have key functions"); 12100 (void)TSK; 12101 } else if (!KeyFunction) { 12102 // If we have a class with no key function that is the subject 12103 // of an explicit instantiation declaration, suppress the 12104 // vtable; it will live with the explicit instantiation 12105 // definition. 12106 bool IsExplicitInstantiationDeclaration 12107 = Class->getTemplateSpecializationKind() 12108 == TSK_ExplicitInstantiationDeclaration; 12109 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 12110 REnd = Class->redecls_end(); 12111 R != REnd; ++R) { 12112 TemplateSpecializationKind TSK 12113 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 12114 if (TSK == TSK_ExplicitInstantiationDeclaration) 12115 IsExplicitInstantiationDeclaration = true; 12116 else if (TSK == TSK_ExplicitInstantiationDefinition) { 12117 IsExplicitInstantiationDeclaration = false; 12118 break; 12119 } 12120 } 12121 12122 if (IsExplicitInstantiationDeclaration) 12123 DefineVTable = false; 12124 } 12125 12126 // The exception specifications for all virtual members may be needed even 12127 // if we are not providing an authoritative form of the vtable in this TU. 12128 // We may choose to emit it available_externally anyway. 12129 if (!DefineVTable) { 12130 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 12131 continue; 12132 } 12133 12134 // Mark all of the virtual members of this class as referenced, so 12135 // that we can build a vtable. Then, tell the AST consumer that a 12136 // vtable for this class is required. 12137 DefinedAnything = true; 12138 MarkVirtualMembersReferenced(Loc, Class); 12139 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12140 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 12141 12142 // Optionally warn if we're emitting a weak vtable. 12143 if (Class->isExternallyVisible() && 12144 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 12145 const FunctionDecl *KeyFunctionDef = 0; 12146 if (!KeyFunction || 12147 (KeyFunction->hasBody(KeyFunctionDef) && 12148 KeyFunctionDef->isInlined())) 12149 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 12150 TSK_ExplicitInstantiationDefinition 12151 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 12152 << Class; 12153 } 12154 } 12155 VTableUses.clear(); 12156 12157 return DefinedAnything; 12158} 12159 12160void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 12161 const CXXRecordDecl *RD) { 12162 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 12163 E = RD->method_end(); I != E; ++I) 12164 if ((*I)->isVirtual() && !(*I)->isPure()) 12165 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 12166} 12167 12168void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 12169 const CXXRecordDecl *RD) { 12170 // Mark all functions which will appear in RD's vtable as used. 12171 CXXFinalOverriderMap FinalOverriders; 12172 RD->getFinalOverriders(FinalOverriders); 12173 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 12174 E = FinalOverriders.end(); 12175 I != E; ++I) { 12176 for (OverridingMethods::const_iterator OI = I->second.begin(), 12177 OE = I->second.end(); 12178 OI != OE; ++OI) { 12179 assert(OI->second.size() > 0 && "no final overrider"); 12180 CXXMethodDecl *Overrider = OI->second.front().Method; 12181 12182 // C++ [basic.def.odr]p2: 12183 // [...] A virtual member function is used if it is not pure. [...] 12184 if (!Overrider->isPure()) 12185 MarkFunctionReferenced(Loc, Overrider); 12186 } 12187 } 12188 12189 // Only classes that have virtual bases need a VTT. 12190 if (RD->getNumVBases() == 0) 12191 return; 12192 12193 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 12194 e = RD->bases_end(); i != e; ++i) { 12195 const CXXRecordDecl *Base = 12196 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 12197 if (Base->getNumVBases() == 0) 12198 continue; 12199 MarkVirtualMembersReferenced(Loc, Base); 12200 } 12201} 12202 12203/// SetIvarInitializers - This routine builds initialization ASTs for the 12204/// Objective-C implementation whose ivars need be initialized. 12205void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 12206 if (!getLangOpts().CPlusPlus) 12207 return; 12208 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 12209 SmallVector<ObjCIvarDecl*, 8> ivars; 12210 CollectIvarsToConstructOrDestruct(OID, ivars); 12211 if (ivars.empty()) 12212 return; 12213 SmallVector<CXXCtorInitializer*, 32> AllToInit; 12214 for (unsigned i = 0; i < ivars.size(); i++) { 12215 FieldDecl *Field = ivars[i]; 12216 if (Field->isInvalidDecl()) 12217 continue; 12218 12219 CXXCtorInitializer *Member; 12220 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 12221 InitializationKind InitKind = 12222 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 12223 12224 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 12225 ExprResult MemberInit = 12226 InitSeq.Perform(*this, InitEntity, InitKind, None); 12227 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 12228 // Note, MemberInit could actually come back empty if no initialization 12229 // is required (e.g., because it would call a trivial default constructor) 12230 if (!MemberInit.get() || MemberInit.isInvalid()) 12231 continue; 12232 12233 Member = 12234 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 12235 SourceLocation(), 12236 MemberInit.takeAs<Expr>(), 12237 SourceLocation()); 12238 AllToInit.push_back(Member); 12239 12240 // Be sure that the destructor is accessible and is marked as referenced. 12241 if (const RecordType *RecordTy 12242 = Context.getBaseElementType(Field->getType()) 12243 ->getAs<RecordType>()) { 12244 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 12245 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 12246 MarkFunctionReferenced(Field->getLocation(), Destructor); 12247 CheckDestructorAccess(Field->getLocation(), Destructor, 12248 PDiag(diag::err_access_dtor_ivar) 12249 << Context.getBaseElementType(Field->getType())); 12250 } 12251 } 12252 } 12253 ObjCImplementation->setIvarInitializers(Context, 12254 AllToInit.data(), AllToInit.size()); 12255 } 12256} 12257 12258static 12259void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12260 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12261 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12262 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12263 Sema &S) { 12264 if (Ctor->isInvalidDecl()) 12265 return; 12266 12267 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12268 12269 // Target may not be determinable yet, for instance if this is a dependent 12270 // call in an uninstantiated template. 12271 if (Target) { 12272 const FunctionDecl *FNTarget = 0; 12273 (void)Target->hasBody(FNTarget); 12274 Target = const_cast<CXXConstructorDecl*>( 12275 cast_or_null<CXXConstructorDecl>(FNTarget)); 12276 } 12277 12278 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12279 // Avoid dereferencing a null pointer here. 12280 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12281 12282 if (!Current.insert(Canonical)) 12283 return; 12284 12285 // We know that beyond here, we aren't chaining into a cycle. 12286 if (!Target || !Target->isDelegatingConstructor() || 12287 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12288 Valid.insert(Current.begin(), Current.end()); 12289 Current.clear(); 12290 // We've hit a cycle. 12291 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12292 Current.count(TCanonical)) { 12293 // If we haven't diagnosed this cycle yet, do so now. 12294 if (!Invalid.count(TCanonical)) { 12295 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12296 diag::warn_delegating_ctor_cycle) 12297 << Ctor; 12298 12299 // Don't add a note for a function delegating directly to itself. 12300 if (TCanonical != Canonical) 12301 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12302 12303 CXXConstructorDecl *C = Target; 12304 while (C->getCanonicalDecl() != Canonical) { 12305 const FunctionDecl *FNTarget = 0; 12306 (void)C->getTargetConstructor()->hasBody(FNTarget); 12307 assert(FNTarget && "Ctor cycle through bodiless function"); 12308 12309 C = const_cast<CXXConstructorDecl*>( 12310 cast<CXXConstructorDecl>(FNTarget)); 12311 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12312 } 12313 } 12314 12315 Invalid.insert(Current.begin(), Current.end()); 12316 Current.clear(); 12317 } else { 12318 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12319 } 12320} 12321 12322 12323void Sema::CheckDelegatingCtorCycles() { 12324 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12325 12326 for (DelegatingCtorDeclsType::iterator 12327 I = DelegatingCtorDecls.begin(ExternalSource), 12328 E = DelegatingCtorDecls.end(); 12329 I != E; ++I) 12330 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12331 12332 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(), 12333 CE = Invalid.end(); 12334 CI != CE; ++CI) 12335 (*CI)->setInvalidDecl(); 12336} 12337 12338namespace { 12339 /// \brief AST visitor that finds references to the 'this' expression. 12340 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12341 Sema &S; 12342 12343 public: 12344 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12345 12346 bool VisitCXXThisExpr(CXXThisExpr *E) { 12347 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12348 << E->isImplicit(); 12349 return false; 12350 } 12351 }; 12352} 12353 12354bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12355 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12356 if (!TSInfo) 12357 return false; 12358 12359 TypeLoc TL = TSInfo->getTypeLoc(); 12360 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12361 if (!ProtoTL) 12362 return false; 12363 12364 // C++11 [expr.prim.general]p3: 12365 // [The expression this] shall not appear before the optional 12366 // cv-qualifier-seq and it shall not appear within the declaration of a 12367 // static member function (although its type and value category are defined 12368 // within a static member function as they are within a non-static member 12369 // function). [ Note: this is because declaration matching does not occur 12370 // until the complete declarator is known. - end note ] 12371 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12372 FindCXXThisExpr Finder(*this); 12373 12374 // If the return type came after the cv-qualifier-seq, check it now. 12375 if (Proto->hasTrailingReturn() && 12376 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12377 return true; 12378 12379 // Check the exception specification. 12380 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12381 return true; 12382 12383 return checkThisInStaticMemberFunctionAttributes(Method); 12384} 12385 12386bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12387 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12388 if (!TSInfo) 12389 return false; 12390 12391 TypeLoc TL = TSInfo->getTypeLoc(); 12392 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12393 if (!ProtoTL) 12394 return false; 12395 12396 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12397 FindCXXThisExpr Finder(*this); 12398 12399 switch (Proto->getExceptionSpecType()) { 12400 case EST_Uninstantiated: 12401 case EST_Unevaluated: 12402 case EST_BasicNoexcept: 12403 case EST_DynamicNone: 12404 case EST_MSAny: 12405 case EST_None: 12406 break; 12407 12408 case EST_ComputedNoexcept: 12409 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12410 return true; 12411 12412 case EST_Dynamic: 12413 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12414 EEnd = Proto->exception_end(); 12415 E != EEnd; ++E) { 12416 if (!Finder.TraverseType(*E)) 12417 return true; 12418 } 12419 break; 12420 } 12421 12422 return false; 12423} 12424 12425bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12426 FindCXXThisExpr Finder(*this); 12427 12428 // Check attributes. 12429 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12430 A != AEnd; ++A) { 12431 // FIXME: This should be emitted by tblgen. 12432 Expr *Arg = 0; 12433 ArrayRef<Expr *> Args; 12434 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12435 Arg = G->getArg(); 12436 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12437 Arg = G->getArg(); 12438 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12439 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12440 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12441 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12442 else if (ExclusiveLockFunctionAttr *ELF 12443 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12444 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12445 else if (SharedLockFunctionAttr *SLF 12446 = dyn_cast<SharedLockFunctionAttr>(*A)) 12447 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12448 else if (ExclusiveTrylockFunctionAttr *ETLF 12449 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12450 Arg = ETLF->getSuccessValue(); 12451 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12452 } else if (SharedTrylockFunctionAttr *STLF 12453 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12454 Arg = STLF->getSuccessValue(); 12455 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12456 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12457 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12458 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12459 Arg = LR->getArg(); 12460 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12461 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12462 else if (ExclusiveLocksRequiredAttr *ELR 12463 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12464 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12465 else if (SharedLocksRequiredAttr *SLR 12466 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12467 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12468 12469 if (Arg && !Finder.TraverseStmt(Arg)) 12470 return true; 12471 12472 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12473 if (!Finder.TraverseStmt(Args[I])) 12474 return true; 12475 } 12476 } 12477 12478 return false; 12479} 12480 12481void 12482Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12483 ArrayRef<ParsedType> DynamicExceptions, 12484 ArrayRef<SourceRange> DynamicExceptionRanges, 12485 Expr *NoexceptExpr, 12486 SmallVectorImpl<QualType> &Exceptions, 12487 FunctionProtoType::ExtProtoInfo &EPI) { 12488 Exceptions.clear(); 12489 EPI.ExceptionSpecType = EST; 12490 if (EST == EST_Dynamic) { 12491 Exceptions.reserve(DynamicExceptions.size()); 12492 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12493 // FIXME: Preserve type source info. 12494 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12495 12496 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12497 collectUnexpandedParameterPacks(ET, Unexpanded); 12498 if (!Unexpanded.empty()) { 12499 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12500 UPPC_ExceptionType, 12501 Unexpanded); 12502 continue; 12503 } 12504 12505 // Check that the type is valid for an exception spec, and 12506 // drop it if not. 12507 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12508 Exceptions.push_back(ET); 12509 } 12510 EPI.NumExceptions = Exceptions.size(); 12511 EPI.Exceptions = Exceptions.data(); 12512 return; 12513 } 12514 12515 if (EST == EST_ComputedNoexcept) { 12516 // If an error occurred, there's no expression here. 12517 if (NoexceptExpr) { 12518 assert((NoexceptExpr->isTypeDependent() || 12519 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12520 Context.BoolTy) && 12521 "Parser should have made sure that the expression is boolean"); 12522 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12523 EPI.ExceptionSpecType = EST_BasicNoexcept; 12524 return; 12525 } 12526 12527 if (!NoexceptExpr->isValueDependent()) 12528 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12529 diag::err_noexcept_needs_constant_expression, 12530 /*AllowFold*/ false).take(); 12531 EPI.NoexceptExpr = NoexceptExpr; 12532 } 12533 return; 12534 } 12535} 12536 12537/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12538Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12539 // Implicitly declared functions (e.g. copy constructors) are 12540 // __host__ __device__ 12541 if (D->isImplicit()) 12542 return CFT_HostDevice; 12543 12544 if (D->hasAttr<CUDAGlobalAttr>()) 12545 return CFT_Global; 12546 12547 if (D->hasAttr<CUDADeviceAttr>()) { 12548 if (D->hasAttr<CUDAHostAttr>()) 12549 return CFT_HostDevice; 12550 return CFT_Device; 12551 } 12552 12553 return CFT_Host; 12554} 12555 12556bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12557 CUDAFunctionTarget CalleeTarget) { 12558 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12559 // Callable from the device only." 12560 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12561 return true; 12562 12563 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12564 // Callable from the host only." 12565 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12566 // Callable from the host only." 12567 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12568 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12569 return true; 12570 12571 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12572 return true; 12573 12574 return false; 12575} 12576 12577/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12578/// 12579MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12580 SourceLocation DeclStart, 12581 Declarator &D, Expr *BitWidth, 12582 InClassInitStyle InitStyle, 12583 AccessSpecifier AS, 12584 AttributeList *MSPropertyAttr) { 12585 IdentifierInfo *II = D.getIdentifier(); 12586 if (!II) { 12587 Diag(DeclStart, diag::err_anonymous_property); 12588 return NULL; 12589 } 12590 SourceLocation Loc = D.getIdentifierLoc(); 12591 12592 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12593 QualType T = TInfo->getType(); 12594 if (getLangOpts().CPlusPlus) { 12595 CheckExtraCXXDefaultArguments(D); 12596 12597 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12598 UPPC_DataMemberType)) { 12599 D.setInvalidType(); 12600 T = Context.IntTy; 12601 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12602 } 12603 } 12604 12605 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12606 12607 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12608 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12609 diag::err_invalid_thread) 12610 << DeclSpec::getSpecifierName(TSCS); 12611 12612 // Check to see if this name was declared as a member previously 12613 NamedDecl *PrevDecl = 0; 12614 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12615 LookupName(Previous, S); 12616 switch (Previous.getResultKind()) { 12617 case LookupResult::Found: 12618 case LookupResult::FoundUnresolvedValue: 12619 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12620 break; 12621 12622 case LookupResult::FoundOverloaded: 12623 PrevDecl = Previous.getRepresentativeDecl(); 12624 break; 12625 12626 case LookupResult::NotFound: 12627 case LookupResult::NotFoundInCurrentInstantiation: 12628 case LookupResult::Ambiguous: 12629 break; 12630 } 12631 12632 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12633 // Maybe we will complain about the shadowed template parameter. 12634 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12635 // Just pretend that we didn't see the previous declaration. 12636 PrevDecl = 0; 12637 } 12638 12639 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12640 PrevDecl = 0; 12641 12642 SourceLocation TSSL = D.getLocStart(); 12643 MSPropertyDecl *NewPD; 12644 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12645 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12646 II, T, TInfo, TSSL, 12647 Data.GetterId, Data.SetterId); 12648 ProcessDeclAttributes(TUScope, NewPD, D); 12649 NewPD->setAccess(AS); 12650 12651 if (NewPD->isInvalidDecl()) 12652 Record->setInvalidDecl(); 12653 12654 if (D.getDeclSpec().isModulePrivateSpecified()) 12655 NewPD->setModulePrivate(); 12656 12657 if (NewPD->isInvalidDecl() && PrevDecl) { 12658 // Don't introduce NewFD into scope; there's already something 12659 // with the same name in the same scope. 12660 } else if (II) { 12661 PushOnScopeChains(NewPD, S); 12662 } else 12663 Record->addDecl(NewPD); 12664 12665 return NewPD; 12666} 12667