SemaDeclCXX.cpp revision c4ef9485252c6a408acb70aac5a153dcd9d860c7
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/Preprocessor.h" 31#include "clang/Sema/CXXFieldCollector.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/Initialization.h" 34#include "clang/Sema/Lookup.h" 35#include "clang/Sema/ParsedTemplate.h" 36#include "clang/Sema/Scope.h" 37#include "clang/Sema/ScopeInfo.h" 38#include "llvm/ADT/STLExtras.h" 39#include "llvm/ADT/SmallString.h" 40#include <map> 41#include <set> 42 43using namespace clang; 44 45//===----------------------------------------------------------------------===// 46// CheckDefaultArgumentVisitor 47//===----------------------------------------------------------------------===// 48 49namespace { 50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 51 /// the default argument of a parameter to determine whether it 52 /// contains any ill-formed subexpressions. For example, this will 53 /// diagnose the use of local variables or parameters within the 54 /// default argument expression. 55 class CheckDefaultArgumentVisitor 56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 57 Expr *DefaultArg; 58 Sema *S; 59 60 public: 61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 62 : DefaultArg(defarg), S(s) {} 63 64 bool VisitExpr(Expr *Node); 65 bool VisitDeclRefExpr(DeclRefExpr *DRE); 66 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 67 bool VisitLambdaExpr(LambdaExpr *Lambda); 68 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); 69 }; 70 71 /// VisitExpr - Visit all of the children of this expression. 72 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 73 bool IsInvalid = false; 74 for (Stmt::child_range I = Node->children(); I; ++I) 75 IsInvalid |= Visit(*I); 76 return IsInvalid; 77 } 78 79 /// VisitDeclRefExpr - Visit a reference to a declaration, to 80 /// determine whether this declaration can be used in the default 81 /// argument expression. 82 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 83 NamedDecl *Decl = DRE->getDecl(); 84 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p9 86 // Default arguments are evaluated each time the function is 87 // called. The order of evaluation of function arguments is 88 // unspecified. Consequently, parameters of a function shall not 89 // be used in default argument expressions, even if they are not 90 // evaluated. Parameters of a function declared before a default 91 // argument expression are in scope and can hide namespace and 92 // class member names. 93 return S->Diag(DRE->getLocStart(), 94 diag::err_param_default_argument_references_param) 95 << Param->getDeclName() << DefaultArg->getSourceRange(); 96 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 97 // C++ [dcl.fct.default]p7 98 // Local variables shall not be used in default argument 99 // expressions. 100 if (VDecl->isLocalVarDecl()) 101 return S->Diag(DRE->getLocStart(), 102 diag::err_param_default_argument_references_local) 103 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 104 } 105 106 return false; 107 } 108 109 /// VisitCXXThisExpr - Visit a C++ "this" expression. 110 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 111 // C++ [dcl.fct.default]p8: 112 // The keyword this shall not be used in a default argument of a 113 // member function. 114 return S->Diag(ThisE->getLocStart(), 115 diag::err_param_default_argument_references_this) 116 << ThisE->getSourceRange(); 117 } 118 119 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { 120 bool Invalid = false; 121 for (PseudoObjectExpr::semantics_iterator 122 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { 123 Expr *E = *i; 124 125 // Look through bindings. 126 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { 127 E = OVE->getSourceExpr(); 128 assert(E && "pseudo-object binding without source expression?"); 129 } 130 131 Invalid |= Visit(E); 132 } 133 return Invalid; 134 } 135 136 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 137 // C++11 [expr.lambda.prim]p13: 138 // A lambda-expression appearing in a default argument shall not 139 // implicitly or explicitly capture any entity. 140 if (Lambda->capture_begin() == Lambda->capture_end()) 141 return false; 142 143 return S->Diag(Lambda->getLocStart(), 144 diag::err_lambda_capture_default_arg); 145 } 146} 147 148void 149Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 150 const CXXMethodDecl *Method) { 151 // If we have an MSAny spec already, don't bother. 152 if (!Method || ComputedEST == EST_MSAny) 153 return; 154 155 const FunctionProtoType *Proto 156 = Method->getType()->getAs<FunctionProtoType>(); 157 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 158 if (!Proto) 159 return; 160 161 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 162 163 // If this function can throw any exceptions, make a note of that. 164 if (EST == EST_MSAny || EST == EST_None) { 165 ClearExceptions(); 166 ComputedEST = EST; 167 return; 168 } 169 170 // FIXME: If the call to this decl is using any of its default arguments, we 171 // need to search them for potentially-throwing calls. 172 173 // If this function has a basic noexcept, it doesn't affect the outcome. 174 if (EST == EST_BasicNoexcept) 175 return; 176 177 // If we have a throw-all spec at this point, ignore the function. 178 if (ComputedEST == EST_None) 179 return; 180 181 // If we're still at noexcept(true) and there's a nothrow() callee, 182 // change to that specification. 183 if (EST == EST_DynamicNone) { 184 if (ComputedEST == EST_BasicNoexcept) 185 ComputedEST = EST_DynamicNone; 186 return; 187 } 188 189 // Check out noexcept specs. 190 if (EST == EST_ComputedNoexcept) { 191 FunctionProtoType::NoexceptResult NR = 192 Proto->getNoexceptSpec(Self->Context); 193 assert(NR != FunctionProtoType::NR_NoNoexcept && 194 "Must have noexcept result for EST_ComputedNoexcept."); 195 assert(NR != FunctionProtoType::NR_Dependent && 196 "Should not generate implicit declarations for dependent cases, " 197 "and don't know how to handle them anyway."); 198 199 // noexcept(false) -> no spec on the new function 200 if (NR == FunctionProtoType::NR_Throw) { 201 ClearExceptions(); 202 ComputedEST = EST_None; 203 } 204 // noexcept(true) won't change anything either. 205 return; 206 } 207 208 assert(EST == EST_Dynamic && "EST case not considered earlier."); 209 assert(ComputedEST != EST_None && 210 "Shouldn't collect exceptions when throw-all is guaranteed."); 211 ComputedEST = EST_Dynamic; 212 // Record the exceptions in this function's exception specification. 213 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 214 EEnd = Proto->exception_end(); 215 E != EEnd; ++E) 216 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 217 Exceptions.push_back(*E); 218} 219 220void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 221 if (!E || ComputedEST == EST_MSAny) 222 return; 223 224 // FIXME: 225 // 226 // C++0x [except.spec]p14: 227 // [An] implicit exception-specification specifies the type-id T if and 228 // only if T is allowed by the exception-specification of a function directly 229 // invoked by f's implicit definition; f shall allow all exceptions if any 230 // function it directly invokes allows all exceptions, and f shall allow no 231 // exceptions if every function it directly invokes allows no exceptions. 232 // 233 // Note in particular that if an implicit exception-specification is generated 234 // for a function containing a throw-expression, that specification can still 235 // be noexcept(true). 236 // 237 // Note also that 'directly invoked' is not defined in the standard, and there 238 // is no indication that we should only consider potentially-evaluated calls. 239 // 240 // Ultimately we should implement the intent of the standard: the exception 241 // specification should be the set of exceptions which can be thrown by the 242 // implicit definition. For now, we assume that any non-nothrow expression can 243 // throw any exception. 244 245 if (Self->canThrow(E)) 246 ComputedEST = EST_None; 247} 248 249bool 250Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 251 SourceLocation EqualLoc) { 252 if (RequireCompleteType(Param->getLocation(), Param->getType(), 253 diag::err_typecheck_decl_incomplete_type)) { 254 Param->setInvalidDecl(); 255 return true; 256 } 257 258 // C++ [dcl.fct.default]p5 259 // A default argument expression is implicitly converted (clause 260 // 4) to the parameter type. The default argument expression has 261 // the same semantic constraints as the initializer expression in 262 // a declaration of a variable of the parameter type, using the 263 // copy-initialization semantics (8.5). 264 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 265 Param); 266 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 267 EqualLoc); 268 InitializationSequence InitSeq(*this, Entity, Kind, Arg); 269 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 270 if (Result.isInvalid()) 271 return true; 272 Arg = Result.takeAs<Expr>(); 273 274 CheckCompletedExpr(Arg, EqualLoc); 275 Arg = MaybeCreateExprWithCleanups(Arg); 276 277 // Okay: add the default argument to the parameter 278 Param->setDefaultArg(Arg); 279 280 // We have already instantiated this parameter; provide each of the 281 // instantiations with the uninstantiated default argument. 282 UnparsedDefaultArgInstantiationsMap::iterator InstPos 283 = UnparsedDefaultArgInstantiations.find(Param); 284 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 285 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 286 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 287 288 // We're done tracking this parameter's instantiations. 289 UnparsedDefaultArgInstantiations.erase(InstPos); 290 } 291 292 return false; 293} 294 295/// ActOnParamDefaultArgument - Check whether the default argument 296/// provided for a function parameter is well-formed. If so, attach it 297/// to the parameter declaration. 298void 299Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 300 Expr *DefaultArg) { 301 if (!param || !DefaultArg) 302 return; 303 304 ParmVarDecl *Param = cast<ParmVarDecl>(param); 305 UnparsedDefaultArgLocs.erase(Param); 306 307 // Default arguments are only permitted in C++ 308 if (!getLangOpts().CPlusPlus) { 309 Diag(EqualLoc, diag::err_param_default_argument) 310 << DefaultArg->getSourceRange(); 311 Param->setInvalidDecl(); 312 return; 313 } 314 315 // Check for unexpanded parameter packs. 316 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 317 Param->setInvalidDecl(); 318 return; 319 } 320 321 // Check that the default argument is well-formed 322 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 323 if (DefaultArgChecker.Visit(DefaultArg)) { 324 Param->setInvalidDecl(); 325 return; 326 } 327 328 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 329} 330 331/// ActOnParamUnparsedDefaultArgument - We've seen a default 332/// argument for a function parameter, but we can't parse it yet 333/// because we're inside a class definition. Note that this default 334/// argument will be parsed later. 335void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 336 SourceLocation EqualLoc, 337 SourceLocation ArgLoc) { 338 if (!param) 339 return; 340 341 ParmVarDecl *Param = cast<ParmVarDecl>(param); 342 if (Param) 343 Param->setUnparsedDefaultArg(); 344 345 UnparsedDefaultArgLocs[Param] = ArgLoc; 346} 347 348/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 349/// the default argument for the parameter param failed. 350void Sema::ActOnParamDefaultArgumentError(Decl *param) { 351 if (!param) 352 return; 353 354 ParmVarDecl *Param = cast<ParmVarDecl>(param); 355 356 Param->setInvalidDecl(); 357 358 UnparsedDefaultArgLocs.erase(Param); 359} 360 361/// CheckExtraCXXDefaultArguments - Check for any extra default 362/// arguments in the declarator, which is not a function declaration 363/// or definition and therefore is not permitted to have default 364/// arguments. This routine should be invoked for every declarator 365/// that is not a function declaration or definition. 366void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 367 // C++ [dcl.fct.default]p3 368 // A default argument expression shall be specified only in the 369 // parameter-declaration-clause of a function declaration or in a 370 // template-parameter (14.1). It shall not be specified for a 371 // parameter pack. If it is specified in a 372 // parameter-declaration-clause, it shall not occur within a 373 // declarator or abstract-declarator of a parameter-declaration. 374 bool MightBeFunction = D.isFunctionDeclarationContext(); 375 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 376 DeclaratorChunk &chunk = D.getTypeObject(i); 377 if (chunk.Kind == DeclaratorChunk::Function) { 378 if (MightBeFunction) { 379 // This is a function declaration. It can have default arguments, but 380 // keep looking in case its return type is a function type with default 381 // arguments. 382 MightBeFunction = false; 383 continue; 384 } 385 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 386 ParmVarDecl *Param = 387 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 388 if (Param->hasUnparsedDefaultArg()) { 389 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 390 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 391 << SourceRange((*Toks)[1].getLocation(), 392 Toks->back().getLocation()); 393 delete Toks; 394 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 395 } else if (Param->getDefaultArg()) { 396 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 397 << Param->getDefaultArg()->getSourceRange(); 398 Param->setDefaultArg(0); 399 } 400 } 401 } else if (chunk.Kind != DeclaratorChunk::Paren) { 402 MightBeFunction = false; 403 } 404 } 405} 406 407static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { 408 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) { 409 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1); 410 if (!PVD->hasDefaultArg()) 411 return false; 412 if (!PVD->hasInheritedDefaultArg()) 413 return true; 414 } 415 return false; 416} 417 418/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 419/// function, once we already know that they have the same 420/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 421/// error, false otherwise. 422bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 423 Scope *S) { 424 bool Invalid = false; 425 426 // C++ [dcl.fct.default]p4: 427 // For non-template functions, default arguments can be added in 428 // later declarations of a function in the same 429 // scope. Declarations in different scopes have completely 430 // distinct sets of default arguments. That is, declarations in 431 // inner scopes do not acquire default arguments from 432 // declarations in outer scopes, and vice versa. In a given 433 // function declaration, all parameters subsequent to a 434 // parameter with a default argument shall have default 435 // arguments supplied in this or previous declarations. A 436 // default argument shall not be redefined by a later 437 // declaration (not even to the same value). 438 // 439 // C++ [dcl.fct.default]p6: 440 // Except for member functions of class templates, the default arguments 441 // in a member function definition that appears outside of the class 442 // definition are added to the set of default arguments provided by the 443 // member function declaration in the class definition. 444 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 445 ParmVarDecl *OldParam = Old->getParamDecl(p); 446 ParmVarDecl *NewParam = New->getParamDecl(p); 447 448 bool OldParamHasDfl = OldParam->hasDefaultArg(); 449 bool NewParamHasDfl = NewParam->hasDefaultArg(); 450 451 NamedDecl *ND = Old; 452 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 453 // Ignore default parameters of old decl if they are not in 454 // the same scope. 455 OldParamHasDfl = false; 456 457 if (OldParamHasDfl && NewParamHasDfl) { 458 459 unsigned DiagDefaultParamID = 460 diag::err_param_default_argument_redefinition; 461 462 // MSVC accepts that default parameters be redefined for member functions 463 // of template class. The new default parameter's value is ignored. 464 Invalid = true; 465 if (getLangOpts().MicrosoftExt) { 466 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 467 if (MD && MD->getParent()->getDescribedClassTemplate()) { 468 // Merge the old default argument into the new parameter. 469 NewParam->setHasInheritedDefaultArg(); 470 if (OldParam->hasUninstantiatedDefaultArg()) 471 NewParam->setUninstantiatedDefaultArg( 472 OldParam->getUninstantiatedDefaultArg()); 473 else 474 NewParam->setDefaultArg(OldParam->getInit()); 475 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 476 Invalid = false; 477 } 478 } 479 480 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 481 // hint here. Alternatively, we could walk the type-source information 482 // for NewParam to find the last source location in the type... but it 483 // isn't worth the effort right now. This is the kind of test case that 484 // is hard to get right: 485 // int f(int); 486 // void g(int (*fp)(int) = f); 487 // void g(int (*fp)(int) = &f); 488 Diag(NewParam->getLocation(), DiagDefaultParamID) 489 << NewParam->getDefaultArgRange(); 490 491 // Look for the function declaration where the default argument was 492 // actually written, which may be a declaration prior to Old. 493 for (FunctionDecl *Older = Old->getPreviousDecl(); 494 Older; Older = Older->getPreviousDecl()) { 495 if (!Older->getParamDecl(p)->hasDefaultArg()) 496 break; 497 498 OldParam = Older->getParamDecl(p); 499 } 500 501 Diag(OldParam->getLocation(), diag::note_previous_definition) 502 << OldParam->getDefaultArgRange(); 503 } else if (OldParamHasDfl) { 504 // Merge the old default argument into the new parameter. 505 // It's important to use getInit() here; getDefaultArg() 506 // strips off any top-level ExprWithCleanups. 507 NewParam->setHasInheritedDefaultArg(); 508 if (OldParam->hasUninstantiatedDefaultArg()) 509 NewParam->setUninstantiatedDefaultArg( 510 OldParam->getUninstantiatedDefaultArg()); 511 else 512 NewParam->setDefaultArg(OldParam->getInit()); 513 } else if (NewParamHasDfl) { 514 if (New->getDescribedFunctionTemplate()) { 515 // Paragraph 4, quoted above, only applies to non-template functions. 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_template_redecl) 518 << NewParam->getDefaultArgRange(); 519 Diag(Old->getLocation(), diag::note_template_prev_declaration) 520 << false; 521 } else if (New->getTemplateSpecializationKind() 522 != TSK_ImplicitInstantiation && 523 New->getTemplateSpecializationKind() != TSK_Undeclared) { 524 // C++ [temp.expr.spec]p21: 525 // Default function arguments shall not be specified in a declaration 526 // or a definition for one of the following explicit specializations: 527 // - the explicit specialization of a function template; 528 // - the explicit specialization of a member function template; 529 // - the explicit specialization of a member function of a class 530 // template where the class template specialization to which the 531 // member function specialization belongs is implicitly 532 // instantiated. 533 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 534 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 535 << New->getDeclName() 536 << NewParam->getDefaultArgRange(); 537 } else if (New->getDeclContext()->isDependentContext()) { 538 // C++ [dcl.fct.default]p6 (DR217): 539 // Default arguments for a member function of a class template shall 540 // be specified on the initial declaration of the member function 541 // within the class template. 542 // 543 // Reading the tea leaves a bit in DR217 and its reference to DR205 544 // leads me to the conclusion that one cannot add default function 545 // arguments for an out-of-line definition of a member function of a 546 // dependent type. 547 int WhichKind = 2; 548 if (CXXRecordDecl *Record 549 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 550 if (Record->getDescribedClassTemplate()) 551 WhichKind = 0; 552 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 553 WhichKind = 1; 554 else 555 WhichKind = 2; 556 } 557 558 Diag(NewParam->getLocation(), 559 diag::err_param_default_argument_member_template_redecl) 560 << WhichKind 561 << NewParam->getDefaultArgRange(); 562 } 563 } 564 } 565 566 // DR1344: If a default argument is added outside a class definition and that 567 // default argument makes the function a special member function, the program 568 // is ill-formed. This can only happen for constructors. 569 if (isa<CXXConstructorDecl>(New) && 570 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 571 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 572 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 573 if (NewSM != OldSM) { 574 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 575 assert(NewParam->hasDefaultArg()); 576 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 577 << NewParam->getDefaultArgRange() << NewSM; 578 Diag(Old->getLocation(), diag::note_previous_declaration); 579 } 580 } 581 582 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 583 // template has a constexpr specifier then all its declarations shall 584 // contain the constexpr specifier. 585 if (New->isConstexpr() != Old->isConstexpr()) { 586 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 587 << New << New->isConstexpr(); 588 Diag(Old->getLocation(), diag::note_previous_declaration); 589 Invalid = true; 590 } 591 592 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default 593 // argument expression, that declaration shall be a definition and shall be 594 // the only declaration of the function or function template in the 595 // translation unit. 596 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && 597 functionDeclHasDefaultArgument(Old)) { 598 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 599 Diag(Old->getLocation(), diag::note_previous_declaration); 600 Invalid = true; 601 } 602 603 if (CheckEquivalentExceptionSpec(Old, New)) 604 Invalid = true; 605 606 return Invalid; 607} 608 609/// \brief Merge the exception specifications of two variable declarations. 610/// 611/// This is called when there's a redeclaration of a VarDecl. The function 612/// checks if the redeclaration might have an exception specification and 613/// validates compatibility and merges the specs if necessary. 614void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 615 // Shortcut if exceptions are disabled. 616 if (!getLangOpts().CXXExceptions) 617 return; 618 619 assert(Context.hasSameType(New->getType(), Old->getType()) && 620 "Should only be called if types are otherwise the same."); 621 622 QualType NewType = New->getType(); 623 QualType OldType = Old->getType(); 624 625 // We're only interested in pointers and references to functions, as well 626 // as pointers to member functions. 627 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 628 NewType = R->getPointeeType(); 629 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 630 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 631 NewType = P->getPointeeType(); 632 OldType = OldType->getAs<PointerType>()->getPointeeType(); 633 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 634 NewType = M->getPointeeType(); 635 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 636 } 637 638 if (!NewType->isFunctionProtoType()) 639 return; 640 641 // There's lots of special cases for functions. For function pointers, system 642 // libraries are hopefully not as broken so that we don't need these 643 // workarounds. 644 if (CheckEquivalentExceptionSpec( 645 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 646 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 647 New->setInvalidDecl(); 648 } 649} 650 651/// CheckCXXDefaultArguments - Verify that the default arguments for a 652/// function declaration are well-formed according to C++ 653/// [dcl.fct.default]. 654void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 655 unsigned NumParams = FD->getNumParams(); 656 unsigned p; 657 658 // Find first parameter with a default argument 659 for (p = 0; p < NumParams; ++p) { 660 ParmVarDecl *Param = FD->getParamDecl(p); 661 if (Param->hasDefaultArg()) 662 break; 663 } 664 665 // C++ [dcl.fct.default]p4: 666 // In a given function declaration, all parameters 667 // subsequent to a parameter with a default argument shall 668 // have default arguments supplied in this or previous 669 // declarations. A default argument shall not be redefined 670 // by a later declaration (not even to the same value). 671 unsigned LastMissingDefaultArg = 0; 672 for (; p < NumParams; ++p) { 673 ParmVarDecl *Param = FD->getParamDecl(p); 674 if (!Param->hasDefaultArg()) { 675 if (Param->isInvalidDecl()) 676 /* We already complained about this parameter. */; 677 else if (Param->getIdentifier()) 678 Diag(Param->getLocation(), 679 diag::err_param_default_argument_missing_name) 680 << Param->getIdentifier(); 681 else 682 Diag(Param->getLocation(), 683 diag::err_param_default_argument_missing); 684 685 LastMissingDefaultArg = p; 686 } 687 } 688 689 if (LastMissingDefaultArg > 0) { 690 // Some default arguments were missing. Clear out all of the 691 // default arguments up to (and including) the last missing 692 // default argument, so that we leave the function parameters 693 // in a semantically valid state. 694 for (p = 0; p <= LastMissingDefaultArg; ++p) { 695 ParmVarDecl *Param = FD->getParamDecl(p); 696 if (Param->hasDefaultArg()) { 697 Param->setDefaultArg(0); 698 } 699 } 700 } 701} 702 703// CheckConstexprParameterTypes - Check whether a function's parameter types 704// are all literal types. If so, return true. If not, produce a suitable 705// diagnostic and return false. 706static bool CheckConstexprParameterTypes(Sema &SemaRef, 707 const FunctionDecl *FD) { 708 unsigned ArgIndex = 0; 709 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 710 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 711 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 712 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 713 SourceLocation ParamLoc = PD->getLocation(); 714 if (!(*i)->isDependentType() && 715 SemaRef.RequireLiteralType(ParamLoc, *i, 716 diag::err_constexpr_non_literal_param, 717 ArgIndex+1, PD->getSourceRange(), 718 isa<CXXConstructorDecl>(FD))) 719 return false; 720 } 721 return true; 722} 723 724/// \brief Get diagnostic %select index for tag kind for 725/// record diagnostic message. 726/// WARNING: Indexes apply to particular diagnostics only! 727/// 728/// \returns diagnostic %select index. 729static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 730 switch (Tag) { 731 case TTK_Struct: return 0; 732 case TTK_Interface: return 1; 733 case TTK_Class: return 2; 734 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 735 } 736} 737 738// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 739// the requirements of a constexpr function definition or a constexpr 740// constructor definition. If so, return true. If not, produce appropriate 741// diagnostics and return false. 742// 743// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 744bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 745 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 746 if (MD && MD->isInstance()) { 747 // C++11 [dcl.constexpr]p4: 748 // The definition of a constexpr constructor shall satisfy the following 749 // constraints: 750 // - the class shall not have any virtual base classes; 751 const CXXRecordDecl *RD = MD->getParent(); 752 if (RD->getNumVBases()) { 753 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 754 << isa<CXXConstructorDecl>(NewFD) 755 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 756 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 757 E = RD->vbases_end(); I != E; ++I) 758 Diag(I->getLocStart(), 759 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 760 return false; 761 } 762 } 763 764 if (!isa<CXXConstructorDecl>(NewFD)) { 765 // C++11 [dcl.constexpr]p3: 766 // The definition of a constexpr function shall satisfy the following 767 // constraints: 768 // - it shall not be virtual; 769 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 770 if (Method && Method->isVirtual()) { 771 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 772 773 // If it's not obvious why this function is virtual, find an overridden 774 // function which uses the 'virtual' keyword. 775 const CXXMethodDecl *WrittenVirtual = Method; 776 while (!WrittenVirtual->isVirtualAsWritten()) 777 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 778 if (WrittenVirtual != Method) 779 Diag(WrittenVirtual->getLocation(), 780 diag::note_overridden_virtual_function); 781 return false; 782 } 783 784 // - its return type shall be a literal type; 785 QualType RT = NewFD->getResultType(); 786 if (!RT->isDependentType() && 787 RequireLiteralType(NewFD->getLocation(), RT, 788 diag::err_constexpr_non_literal_return)) 789 return false; 790 } 791 792 // - each of its parameter types shall be a literal type; 793 if (!CheckConstexprParameterTypes(*this, NewFD)) 794 return false; 795 796 return true; 797} 798 799/// Check the given declaration statement is legal within a constexpr function 800/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. 801/// 802/// \return true if the body is OK (maybe only as an extension), false if we 803/// have diagnosed a problem. 804static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 805 DeclStmt *DS, SourceLocation &Cxx1yLoc) { 806 // C++11 [dcl.constexpr]p3 and p4: 807 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 808 // contain only 809 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 810 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 811 switch ((*DclIt)->getKind()) { 812 case Decl::StaticAssert: 813 case Decl::Using: 814 case Decl::UsingShadow: 815 case Decl::UsingDirective: 816 case Decl::UnresolvedUsingTypename: 817 case Decl::UnresolvedUsingValue: 818 // - static_assert-declarations 819 // - using-declarations, 820 // - using-directives, 821 continue; 822 823 case Decl::Typedef: 824 case Decl::TypeAlias: { 825 // - typedef declarations and alias-declarations that do not define 826 // classes or enumerations, 827 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 828 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 829 // Don't allow variably-modified types in constexpr functions. 830 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 831 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 832 << TL.getSourceRange() << TL.getType() 833 << isa<CXXConstructorDecl>(Dcl); 834 return false; 835 } 836 continue; 837 } 838 839 case Decl::Enum: 840 case Decl::CXXRecord: 841 // C++1y allows types to be defined, not just declared. 842 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) 843 SemaRef.Diag(DS->getLocStart(), 844 SemaRef.getLangOpts().CPlusPlus1y 845 ? diag::warn_cxx11_compat_constexpr_type_definition 846 : diag::ext_constexpr_type_definition) 847 << isa<CXXConstructorDecl>(Dcl); 848 continue; 849 850 case Decl::EnumConstant: 851 case Decl::IndirectField: 852 case Decl::ParmVar: 853 // These can only appear with other declarations which are banned in 854 // C++11 and permitted in C++1y, so ignore them. 855 continue; 856 857 case Decl::Var: { 858 // C++1y [dcl.constexpr]p3 allows anything except: 859 // a definition of a variable of non-literal type or of static or 860 // thread storage duration or for which no initialization is performed. 861 VarDecl *VD = cast<VarDecl>(*DclIt); 862 if (VD->isThisDeclarationADefinition()) { 863 if (VD->isStaticLocal()) { 864 SemaRef.Diag(VD->getLocation(), 865 diag::err_constexpr_local_var_static) 866 << isa<CXXConstructorDecl>(Dcl) 867 << (VD->getTLSKind() == VarDecl::TLS_Dynamic); 868 return false; 869 } 870 if (!VD->getType()->isDependentType() && 871 SemaRef.RequireLiteralType( 872 VD->getLocation(), VD->getType(), 873 diag::err_constexpr_local_var_non_literal_type, 874 isa<CXXConstructorDecl>(Dcl))) 875 return false; 876 if (!VD->hasInit()) { 877 SemaRef.Diag(VD->getLocation(), 878 diag::err_constexpr_local_var_no_init) 879 << isa<CXXConstructorDecl>(Dcl); 880 return false; 881 } 882 } 883 SemaRef.Diag(VD->getLocation(), 884 SemaRef.getLangOpts().CPlusPlus1y 885 ? diag::warn_cxx11_compat_constexpr_local_var 886 : diag::ext_constexpr_local_var) 887 << isa<CXXConstructorDecl>(Dcl); 888 continue; 889 } 890 891 case Decl::NamespaceAlias: 892 case Decl::Function: 893 // These are disallowed in C++11 and permitted in C++1y. Allow them 894 // everywhere as an extension. 895 if (!Cxx1yLoc.isValid()) 896 Cxx1yLoc = DS->getLocStart(); 897 continue; 898 899 default: 900 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 901 << isa<CXXConstructorDecl>(Dcl); 902 return false; 903 } 904 } 905 906 return true; 907} 908 909/// Check that the given field is initialized within a constexpr constructor. 910/// 911/// \param Dcl The constexpr constructor being checked. 912/// \param Field The field being checked. This may be a member of an anonymous 913/// struct or union nested within the class being checked. 914/// \param Inits All declarations, including anonymous struct/union members and 915/// indirect members, for which any initialization was provided. 916/// \param Diagnosed Set to true if an error is produced. 917static void CheckConstexprCtorInitializer(Sema &SemaRef, 918 const FunctionDecl *Dcl, 919 FieldDecl *Field, 920 llvm::SmallSet<Decl*, 16> &Inits, 921 bool &Diagnosed) { 922 if (Field->isInvalidDecl()) 923 return; 924 925 if (Field->isUnnamedBitfield()) 926 return; 927 928 if (Field->isAnonymousStructOrUnion() && 929 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 930 return; 931 932 if (!Inits.count(Field)) { 933 if (!Diagnosed) { 934 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 935 Diagnosed = true; 936 } 937 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 938 } else if (Field->isAnonymousStructOrUnion()) { 939 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 940 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 941 I != E; ++I) 942 // If an anonymous union contains an anonymous struct of which any member 943 // is initialized, all members must be initialized. 944 if (!RD->isUnion() || Inits.count(*I)) 945 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 946 } 947} 948 949/// Check the provided statement is allowed in a constexpr function 950/// definition. 951static bool 952CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, 953 llvm::SmallVectorImpl<SourceLocation> &ReturnStmts, 954 SourceLocation &Cxx1yLoc) { 955 // - its function-body shall be [...] a compound-statement that contains only 956 switch (S->getStmtClass()) { 957 case Stmt::NullStmtClass: 958 // - null statements, 959 return true; 960 961 case Stmt::DeclStmtClass: 962 // - static_assert-declarations 963 // - using-declarations, 964 // - using-directives, 965 // - typedef declarations and alias-declarations that do not define 966 // classes or enumerations, 967 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc)) 968 return false; 969 return true; 970 971 case Stmt::ReturnStmtClass: 972 // - and exactly one return statement; 973 if (isa<CXXConstructorDecl>(Dcl)) { 974 // C++1y allows return statements in constexpr constructors. 975 if (!Cxx1yLoc.isValid()) 976 Cxx1yLoc = S->getLocStart(); 977 return true; 978 } 979 980 ReturnStmts.push_back(S->getLocStart()); 981 return true; 982 983 case Stmt::CompoundStmtClass: { 984 // C++1y allows compound-statements. 985 if (!Cxx1yLoc.isValid()) 986 Cxx1yLoc = S->getLocStart(); 987 988 CompoundStmt *CompStmt = cast<CompoundStmt>(S); 989 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(), 990 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) { 991 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts, 992 Cxx1yLoc)) 993 return false; 994 } 995 return true; 996 } 997 998 case Stmt::AttributedStmtClass: 999 if (!Cxx1yLoc.isValid()) 1000 Cxx1yLoc = S->getLocStart(); 1001 return true; 1002 1003 case Stmt::IfStmtClass: { 1004 // C++1y allows if-statements. 1005 if (!Cxx1yLoc.isValid()) 1006 Cxx1yLoc = S->getLocStart(); 1007 1008 IfStmt *If = cast<IfStmt>(S); 1009 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, 1010 Cxx1yLoc)) 1011 return false; 1012 if (If->getElse() && 1013 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, 1014 Cxx1yLoc)) 1015 return false; 1016 return true; 1017 } 1018 1019 case Stmt::WhileStmtClass: 1020 case Stmt::DoStmtClass: 1021 case Stmt::ForStmtClass: 1022 case Stmt::CXXForRangeStmtClass: 1023 case Stmt::ContinueStmtClass: 1024 // C++1y allows all of these. We don't allow them as extensions in C++11, 1025 // because they don't make sense without variable mutation. 1026 if (!SemaRef.getLangOpts().CPlusPlus1y) 1027 break; 1028 if (!Cxx1yLoc.isValid()) 1029 Cxx1yLoc = S->getLocStart(); 1030 for (Stmt::child_range Children = S->children(); Children; ++Children) 1031 if (*Children && 1032 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1033 Cxx1yLoc)) 1034 return false; 1035 return true; 1036 1037 case Stmt::SwitchStmtClass: 1038 case Stmt::CaseStmtClass: 1039 case Stmt::DefaultStmtClass: 1040 case Stmt::BreakStmtClass: 1041 // C++1y allows switch-statements, and since they don't need variable 1042 // mutation, we can reasonably allow them in C++11 as an extension. 1043 if (!Cxx1yLoc.isValid()) 1044 Cxx1yLoc = S->getLocStart(); 1045 for (Stmt::child_range Children = S->children(); Children; ++Children) 1046 if (*Children && 1047 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1048 Cxx1yLoc)) 1049 return false; 1050 return true; 1051 1052 default: 1053 if (!isa<Expr>(S)) 1054 break; 1055 1056 // C++1y allows expression-statements. 1057 if (!Cxx1yLoc.isValid()) 1058 Cxx1yLoc = S->getLocStart(); 1059 return true; 1060 } 1061 1062 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt) 1063 << isa<CXXConstructorDecl>(Dcl); 1064 return false; 1065} 1066 1067/// Check the body for the given constexpr function declaration only contains 1068/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 1069/// 1070/// \return true if the body is OK, false if we have diagnosed a problem. 1071bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 1072 if (isa<CXXTryStmt>(Body)) { 1073 // C++11 [dcl.constexpr]p3: 1074 // The definition of a constexpr function shall satisfy the following 1075 // constraints: [...] 1076 // - its function-body shall be = delete, = default, or a 1077 // compound-statement 1078 // 1079 // C++11 [dcl.constexpr]p4: 1080 // In the definition of a constexpr constructor, [...] 1081 // - its function-body shall not be a function-try-block; 1082 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 1083 << isa<CXXConstructorDecl>(Dcl); 1084 return false; 1085 } 1086 1087 SmallVector<SourceLocation, 4> ReturnStmts; 1088 1089 // - its function-body shall be [...] a compound-statement that contains only 1090 // [... list of cases ...] 1091 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 1092 SourceLocation Cxx1yLoc; 1093 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 1094 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 1095 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc)) 1096 return false; 1097 } 1098 1099 if (Cxx1yLoc.isValid()) 1100 Diag(Cxx1yLoc, 1101 getLangOpts().CPlusPlus1y 1102 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt 1103 : diag::ext_constexpr_body_invalid_stmt) 1104 << isa<CXXConstructorDecl>(Dcl); 1105 1106 if (const CXXConstructorDecl *Constructor 1107 = dyn_cast<CXXConstructorDecl>(Dcl)) { 1108 const CXXRecordDecl *RD = Constructor->getParent(); 1109 // DR1359: 1110 // - every non-variant non-static data member and base class sub-object 1111 // shall be initialized; 1112 // - if the class is a non-empty union, or for each non-empty anonymous 1113 // union member of a non-union class, exactly one non-static data member 1114 // shall be initialized; 1115 if (RD->isUnion()) { 1116 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 1117 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 1118 return false; 1119 } 1120 } else if (!Constructor->isDependentContext() && 1121 !Constructor->isDelegatingConstructor()) { 1122 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 1123 1124 // Skip detailed checking if we have enough initializers, and we would 1125 // allow at most one initializer per member. 1126 bool AnyAnonStructUnionMembers = false; 1127 unsigned Fields = 0; 1128 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1129 E = RD->field_end(); I != E; ++I, ++Fields) { 1130 if (I->isAnonymousStructOrUnion()) { 1131 AnyAnonStructUnionMembers = true; 1132 break; 1133 } 1134 } 1135 if (AnyAnonStructUnionMembers || 1136 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 1137 // Check initialization of non-static data members. Base classes are 1138 // always initialized so do not need to be checked. Dependent bases 1139 // might not have initializers in the member initializer list. 1140 llvm::SmallSet<Decl*, 16> Inits; 1141 for (CXXConstructorDecl::init_const_iterator 1142 I = Constructor->init_begin(), E = Constructor->init_end(); 1143 I != E; ++I) { 1144 if (FieldDecl *FD = (*I)->getMember()) 1145 Inits.insert(FD); 1146 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 1147 Inits.insert(ID->chain_begin(), ID->chain_end()); 1148 } 1149 1150 bool Diagnosed = false; 1151 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1152 E = RD->field_end(); I != E; ++I) 1153 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 1154 if (Diagnosed) 1155 return false; 1156 } 1157 } 1158 } else { 1159 if (ReturnStmts.empty()) { 1160 // C++1y doesn't require constexpr functions to contain a 'return' 1161 // statement. We still do, unless the return type is void, because 1162 // otherwise if there's no return statement, the function cannot 1163 // be used in a core constant expression. 1164 bool OK = getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType(); 1165 Diag(Dcl->getLocation(), 1166 OK ? diag::warn_cxx11_compat_constexpr_body_no_return 1167 : diag::err_constexpr_body_no_return); 1168 return OK; 1169 } 1170 if (ReturnStmts.size() > 1) { 1171 Diag(ReturnStmts.back(), 1172 getLangOpts().CPlusPlus1y 1173 ? diag::warn_cxx11_compat_constexpr_body_multiple_return 1174 : diag::ext_constexpr_body_multiple_return); 1175 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 1176 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 1177 } 1178 } 1179 1180 // C++11 [dcl.constexpr]p5: 1181 // if no function argument values exist such that the function invocation 1182 // substitution would produce a constant expression, the program is 1183 // ill-formed; no diagnostic required. 1184 // C++11 [dcl.constexpr]p3: 1185 // - every constructor call and implicit conversion used in initializing the 1186 // return value shall be one of those allowed in a constant expression. 1187 // C++11 [dcl.constexpr]p4: 1188 // - every constructor involved in initializing non-static data members and 1189 // base class sub-objects shall be a constexpr constructor. 1190 SmallVector<PartialDiagnosticAt, 8> Diags; 1191 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1192 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1193 << isa<CXXConstructorDecl>(Dcl); 1194 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1195 Diag(Diags[I].first, Diags[I].second); 1196 // Don't return false here: we allow this for compatibility in 1197 // system headers. 1198 } 1199 1200 return true; 1201} 1202 1203/// isCurrentClassName - Determine whether the identifier II is the 1204/// name of the class type currently being defined. In the case of 1205/// nested classes, this will only return true if II is the name of 1206/// the innermost class. 1207bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1208 const CXXScopeSpec *SS) { 1209 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1210 1211 CXXRecordDecl *CurDecl; 1212 if (SS && SS->isSet() && !SS->isInvalid()) { 1213 DeclContext *DC = computeDeclContext(*SS, true); 1214 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1215 } else 1216 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1217 1218 if (CurDecl && CurDecl->getIdentifier()) 1219 return &II == CurDecl->getIdentifier(); 1220 else 1221 return false; 1222} 1223 1224/// \brief Determine whether the given class is a base class of the given 1225/// class, including looking at dependent bases. 1226static bool findCircularInheritance(const CXXRecordDecl *Class, 1227 const CXXRecordDecl *Current) { 1228 SmallVector<const CXXRecordDecl*, 8> Queue; 1229 1230 Class = Class->getCanonicalDecl(); 1231 while (true) { 1232 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1233 E = Current->bases_end(); 1234 I != E; ++I) { 1235 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1236 if (!Base) 1237 continue; 1238 1239 Base = Base->getDefinition(); 1240 if (!Base) 1241 continue; 1242 1243 if (Base->getCanonicalDecl() == Class) 1244 return true; 1245 1246 Queue.push_back(Base); 1247 } 1248 1249 if (Queue.empty()) 1250 return false; 1251 1252 Current = Queue.back(); 1253 Queue.pop_back(); 1254 } 1255 1256 return false; 1257} 1258 1259/// \brief Check the validity of a C++ base class specifier. 1260/// 1261/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1262/// and returns NULL otherwise. 1263CXXBaseSpecifier * 1264Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1265 SourceRange SpecifierRange, 1266 bool Virtual, AccessSpecifier Access, 1267 TypeSourceInfo *TInfo, 1268 SourceLocation EllipsisLoc) { 1269 QualType BaseType = TInfo->getType(); 1270 1271 // C++ [class.union]p1: 1272 // A union shall not have base classes. 1273 if (Class->isUnion()) { 1274 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1275 << SpecifierRange; 1276 return 0; 1277 } 1278 1279 if (EllipsisLoc.isValid() && 1280 !TInfo->getType()->containsUnexpandedParameterPack()) { 1281 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1282 << TInfo->getTypeLoc().getSourceRange(); 1283 EllipsisLoc = SourceLocation(); 1284 } 1285 1286 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1287 1288 if (BaseType->isDependentType()) { 1289 // Make sure that we don't have circular inheritance among our dependent 1290 // bases. For non-dependent bases, the check for completeness below handles 1291 // this. 1292 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1293 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1294 ((BaseDecl = BaseDecl->getDefinition()) && 1295 findCircularInheritance(Class, BaseDecl))) { 1296 Diag(BaseLoc, diag::err_circular_inheritance) 1297 << BaseType << Context.getTypeDeclType(Class); 1298 1299 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1300 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1301 << BaseType; 1302 1303 return 0; 1304 } 1305 } 1306 1307 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1308 Class->getTagKind() == TTK_Class, 1309 Access, TInfo, EllipsisLoc); 1310 } 1311 1312 // Base specifiers must be record types. 1313 if (!BaseType->isRecordType()) { 1314 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1315 return 0; 1316 } 1317 1318 // C++ [class.union]p1: 1319 // A union shall not be used as a base class. 1320 if (BaseType->isUnionType()) { 1321 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1322 return 0; 1323 } 1324 1325 // C++ [class.derived]p2: 1326 // The class-name in a base-specifier shall not be an incompletely 1327 // defined class. 1328 if (RequireCompleteType(BaseLoc, BaseType, 1329 diag::err_incomplete_base_class, SpecifierRange)) { 1330 Class->setInvalidDecl(); 1331 return 0; 1332 } 1333 1334 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1335 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1336 assert(BaseDecl && "Record type has no declaration"); 1337 BaseDecl = BaseDecl->getDefinition(); 1338 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1339 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1340 assert(CXXBaseDecl && "Base type is not a C++ type"); 1341 1342 // C++ [class]p3: 1343 // If a class is marked final and it appears as a base-type-specifier in 1344 // base-clause, the program is ill-formed. 1345 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1346 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1347 << CXXBaseDecl->getDeclName(); 1348 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1349 << CXXBaseDecl->getDeclName(); 1350 return 0; 1351 } 1352 1353 if (BaseDecl->isInvalidDecl()) 1354 Class->setInvalidDecl(); 1355 1356 // Create the base specifier. 1357 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1358 Class->getTagKind() == TTK_Class, 1359 Access, TInfo, EllipsisLoc); 1360} 1361 1362/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1363/// one entry in the base class list of a class specifier, for 1364/// example: 1365/// class foo : public bar, virtual private baz { 1366/// 'public bar' and 'virtual private baz' are each base-specifiers. 1367BaseResult 1368Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1369 ParsedAttributes &Attributes, 1370 bool Virtual, AccessSpecifier Access, 1371 ParsedType basetype, SourceLocation BaseLoc, 1372 SourceLocation EllipsisLoc) { 1373 if (!classdecl) 1374 return true; 1375 1376 AdjustDeclIfTemplate(classdecl); 1377 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1378 if (!Class) 1379 return true; 1380 1381 // We do not support any C++11 attributes on base-specifiers yet. 1382 // Diagnose any attributes we see. 1383 if (!Attributes.empty()) { 1384 for (AttributeList *Attr = Attributes.getList(); Attr; 1385 Attr = Attr->getNext()) { 1386 if (Attr->isInvalid() || 1387 Attr->getKind() == AttributeList::IgnoredAttribute) 1388 continue; 1389 Diag(Attr->getLoc(), 1390 Attr->getKind() == AttributeList::UnknownAttribute 1391 ? diag::warn_unknown_attribute_ignored 1392 : diag::err_base_specifier_attribute) 1393 << Attr->getName(); 1394 } 1395 } 1396 1397 TypeSourceInfo *TInfo = 0; 1398 GetTypeFromParser(basetype, &TInfo); 1399 1400 if (EllipsisLoc.isInvalid() && 1401 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1402 UPPC_BaseType)) 1403 return true; 1404 1405 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1406 Virtual, Access, TInfo, 1407 EllipsisLoc)) 1408 return BaseSpec; 1409 else 1410 Class->setInvalidDecl(); 1411 1412 return true; 1413} 1414 1415/// \brief Performs the actual work of attaching the given base class 1416/// specifiers to a C++ class. 1417bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1418 unsigned NumBases) { 1419 if (NumBases == 0) 1420 return false; 1421 1422 // Used to keep track of which base types we have already seen, so 1423 // that we can properly diagnose redundant direct base types. Note 1424 // that the key is always the unqualified canonical type of the base 1425 // class. 1426 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1427 1428 // Copy non-redundant base specifiers into permanent storage. 1429 unsigned NumGoodBases = 0; 1430 bool Invalid = false; 1431 for (unsigned idx = 0; idx < NumBases; ++idx) { 1432 QualType NewBaseType 1433 = Context.getCanonicalType(Bases[idx]->getType()); 1434 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1435 1436 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1437 if (KnownBase) { 1438 // C++ [class.mi]p3: 1439 // A class shall not be specified as a direct base class of a 1440 // derived class more than once. 1441 Diag(Bases[idx]->getLocStart(), 1442 diag::err_duplicate_base_class) 1443 << KnownBase->getType() 1444 << Bases[idx]->getSourceRange(); 1445 1446 // Delete the duplicate base class specifier; we're going to 1447 // overwrite its pointer later. 1448 Context.Deallocate(Bases[idx]); 1449 1450 Invalid = true; 1451 } else { 1452 // Okay, add this new base class. 1453 KnownBase = Bases[idx]; 1454 Bases[NumGoodBases++] = Bases[idx]; 1455 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1456 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1457 if (Class->isInterface() && 1458 (!RD->isInterface() || 1459 KnownBase->getAccessSpecifier() != AS_public)) { 1460 // The Microsoft extension __interface does not permit bases that 1461 // are not themselves public interfaces. 1462 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1463 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1464 << RD->getSourceRange(); 1465 Invalid = true; 1466 } 1467 if (RD->hasAttr<WeakAttr>()) 1468 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1469 } 1470 } 1471 } 1472 1473 // Attach the remaining base class specifiers to the derived class. 1474 Class->setBases(Bases, NumGoodBases); 1475 1476 // Delete the remaining (good) base class specifiers, since their 1477 // data has been copied into the CXXRecordDecl. 1478 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1479 Context.Deallocate(Bases[idx]); 1480 1481 return Invalid; 1482} 1483 1484/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1485/// class, after checking whether there are any duplicate base 1486/// classes. 1487void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1488 unsigned NumBases) { 1489 if (!ClassDecl || !Bases || !NumBases) 1490 return; 1491 1492 AdjustDeclIfTemplate(ClassDecl); 1493 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1494 (CXXBaseSpecifier**)(Bases), NumBases); 1495} 1496 1497/// \brief Determine whether the type \p Derived is a C++ class that is 1498/// derived from the type \p Base. 1499bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1500 if (!getLangOpts().CPlusPlus) 1501 return false; 1502 1503 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1504 if (!DerivedRD) 1505 return false; 1506 1507 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1508 if (!BaseRD) 1509 return false; 1510 1511 // If either the base or the derived type is invalid, don't try to 1512 // check whether one is derived from the other. 1513 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1514 return false; 1515 1516 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1517 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1518} 1519 1520/// \brief Determine whether the type \p Derived is a C++ class that is 1521/// derived from the type \p Base. 1522bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1523 if (!getLangOpts().CPlusPlus) 1524 return false; 1525 1526 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1527 if (!DerivedRD) 1528 return false; 1529 1530 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1531 if (!BaseRD) 1532 return false; 1533 1534 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1535} 1536 1537void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1538 CXXCastPath &BasePathArray) { 1539 assert(BasePathArray.empty() && "Base path array must be empty!"); 1540 assert(Paths.isRecordingPaths() && "Must record paths!"); 1541 1542 const CXXBasePath &Path = Paths.front(); 1543 1544 // We first go backward and check if we have a virtual base. 1545 // FIXME: It would be better if CXXBasePath had the base specifier for 1546 // the nearest virtual base. 1547 unsigned Start = 0; 1548 for (unsigned I = Path.size(); I != 0; --I) { 1549 if (Path[I - 1].Base->isVirtual()) { 1550 Start = I - 1; 1551 break; 1552 } 1553 } 1554 1555 // Now add all bases. 1556 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1557 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1558} 1559 1560/// \brief Determine whether the given base path includes a virtual 1561/// base class. 1562bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1563 for (CXXCastPath::const_iterator B = BasePath.begin(), 1564 BEnd = BasePath.end(); 1565 B != BEnd; ++B) 1566 if ((*B)->isVirtual()) 1567 return true; 1568 1569 return false; 1570} 1571 1572/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1573/// conversion (where Derived and Base are class types) is 1574/// well-formed, meaning that the conversion is unambiguous (and 1575/// that all of the base classes are accessible). Returns true 1576/// and emits a diagnostic if the code is ill-formed, returns false 1577/// otherwise. Loc is the location where this routine should point to 1578/// if there is an error, and Range is the source range to highlight 1579/// if there is an error. 1580bool 1581Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1582 unsigned InaccessibleBaseID, 1583 unsigned AmbigiousBaseConvID, 1584 SourceLocation Loc, SourceRange Range, 1585 DeclarationName Name, 1586 CXXCastPath *BasePath) { 1587 // First, determine whether the path from Derived to Base is 1588 // ambiguous. This is slightly more expensive than checking whether 1589 // the Derived to Base conversion exists, because here we need to 1590 // explore multiple paths to determine if there is an ambiguity. 1591 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1592 /*DetectVirtual=*/false); 1593 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1594 assert(DerivationOkay && 1595 "Can only be used with a derived-to-base conversion"); 1596 (void)DerivationOkay; 1597 1598 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1599 if (InaccessibleBaseID) { 1600 // Check that the base class can be accessed. 1601 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1602 InaccessibleBaseID)) { 1603 case AR_inaccessible: 1604 return true; 1605 case AR_accessible: 1606 case AR_dependent: 1607 case AR_delayed: 1608 break; 1609 } 1610 } 1611 1612 // Build a base path if necessary. 1613 if (BasePath) 1614 BuildBasePathArray(Paths, *BasePath); 1615 return false; 1616 } 1617 1618 if (AmbigiousBaseConvID) { 1619 // We know that the derived-to-base conversion is ambiguous, and 1620 // we're going to produce a diagnostic. Perform the derived-to-base 1621 // search just one more time to compute all of the possible paths so 1622 // that we can print them out. This is more expensive than any of 1623 // the previous derived-to-base checks we've done, but at this point 1624 // performance isn't as much of an issue. 1625 Paths.clear(); 1626 Paths.setRecordingPaths(true); 1627 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1628 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1629 (void)StillOkay; 1630 1631 // Build up a textual representation of the ambiguous paths, e.g., 1632 // D -> B -> A, that will be used to illustrate the ambiguous 1633 // conversions in the diagnostic. We only print one of the paths 1634 // to each base class subobject. 1635 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1636 1637 Diag(Loc, AmbigiousBaseConvID) 1638 << Derived << Base << PathDisplayStr << Range << Name; 1639 } 1640 return true; 1641} 1642 1643bool 1644Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1645 SourceLocation Loc, SourceRange Range, 1646 CXXCastPath *BasePath, 1647 bool IgnoreAccess) { 1648 return CheckDerivedToBaseConversion(Derived, Base, 1649 IgnoreAccess ? 0 1650 : diag::err_upcast_to_inaccessible_base, 1651 diag::err_ambiguous_derived_to_base_conv, 1652 Loc, Range, DeclarationName(), 1653 BasePath); 1654} 1655 1656 1657/// @brief Builds a string representing ambiguous paths from a 1658/// specific derived class to different subobjects of the same base 1659/// class. 1660/// 1661/// This function builds a string that can be used in error messages 1662/// to show the different paths that one can take through the 1663/// inheritance hierarchy to go from the derived class to different 1664/// subobjects of a base class. The result looks something like this: 1665/// @code 1666/// struct D -> struct B -> struct A 1667/// struct D -> struct C -> struct A 1668/// @endcode 1669std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1670 std::string PathDisplayStr; 1671 std::set<unsigned> DisplayedPaths; 1672 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1673 Path != Paths.end(); ++Path) { 1674 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1675 // We haven't displayed a path to this particular base 1676 // class subobject yet. 1677 PathDisplayStr += "\n "; 1678 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1679 for (CXXBasePath::const_iterator Element = Path->begin(); 1680 Element != Path->end(); ++Element) 1681 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1682 } 1683 } 1684 1685 return PathDisplayStr; 1686} 1687 1688//===----------------------------------------------------------------------===// 1689// C++ class member Handling 1690//===----------------------------------------------------------------------===// 1691 1692/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1693bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1694 SourceLocation ASLoc, 1695 SourceLocation ColonLoc, 1696 AttributeList *Attrs) { 1697 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1698 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1699 ASLoc, ColonLoc); 1700 CurContext->addHiddenDecl(ASDecl); 1701 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1702} 1703 1704/// CheckOverrideControl - Check C++11 override control semantics. 1705void Sema::CheckOverrideControl(Decl *D) { 1706 if (D->isInvalidDecl()) 1707 return; 1708 1709 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1710 1711 // Do we know which functions this declaration might be overriding? 1712 bool OverridesAreKnown = !MD || 1713 (!MD->getParent()->hasAnyDependentBases() && 1714 !MD->getType()->isDependentType()); 1715 1716 if (!MD || !MD->isVirtual()) { 1717 if (OverridesAreKnown) { 1718 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1719 Diag(OA->getLocation(), 1720 diag::override_keyword_only_allowed_on_virtual_member_functions) 1721 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1722 D->dropAttr<OverrideAttr>(); 1723 } 1724 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1725 Diag(FA->getLocation(), 1726 diag::override_keyword_only_allowed_on_virtual_member_functions) 1727 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1728 D->dropAttr<FinalAttr>(); 1729 } 1730 } 1731 return; 1732 } 1733 1734 if (!OverridesAreKnown) 1735 return; 1736 1737 // C++11 [class.virtual]p5: 1738 // If a virtual function is marked with the virt-specifier override and 1739 // does not override a member function of a base class, the program is 1740 // ill-formed. 1741 bool HasOverriddenMethods = 1742 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1743 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1744 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1745 << MD->getDeclName(); 1746} 1747 1748/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1749/// function overrides a virtual member function marked 'final', according to 1750/// C++11 [class.virtual]p4. 1751bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1752 const CXXMethodDecl *Old) { 1753 if (!Old->hasAttr<FinalAttr>()) 1754 return false; 1755 1756 Diag(New->getLocation(), diag::err_final_function_overridden) 1757 << New->getDeclName(); 1758 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1759 return true; 1760} 1761 1762static bool InitializationHasSideEffects(const FieldDecl &FD) { 1763 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1764 // FIXME: Destruction of ObjC lifetime types has side-effects. 1765 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1766 return !RD->isCompleteDefinition() || 1767 !RD->hasTrivialDefaultConstructor() || 1768 !RD->hasTrivialDestructor(); 1769 return false; 1770} 1771 1772static AttributeList *getMSPropertyAttr(AttributeList *list) { 1773 for (AttributeList* it = list; it != 0; it = it->getNext()) 1774 if (it->isDeclspecPropertyAttribute()) 1775 return it; 1776 return 0; 1777} 1778 1779/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1780/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1781/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1782/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1783/// present (but parsing it has been deferred). 1784NamedDecl * 1785Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1786 MultiTemplateParamsArg TemplateParameterLists, 1787 Expr *BW, const VirtSpecifiers &VS, 1788 InClassInitStyle InitStyle) { 1789 const DeclSpec &DS = D.getDeclSpec(); 1790 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1791 DeclarationName Name = NameInfo.getName(); 1792 SourceLocation Loc = NameInfo.getLoc(); 1793 1794 // For anonymous bitfields, the location should point to the type. 1795 if (Loc.isInvalid()) 1796 Loc = D.getLocStart(); 1797 1798 Expr *BitWidth = static_cast<Expr*>(BW); 1799 1800 assert(isa<CXXRecordDecl>(CurContext)); 1801 assert(!DS.isFriendSpecified()); 1802 1803 bool isFunc = D.isDeclarationOfFunction(); 1804 1805 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1806 // The Microsoft extension __interface only permits public member functions 1807 // and prohibits constructors, destructors, operators, non-public member 1808 // functions, static methods and data members. 1809 unsigned InvalidDecl; 1810 bool ShowDeclName = true; 1811 if (!isFunc) 1812 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1813 else if (AS != AS_public) 1814 InvalidDecl = 2; 1815 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1816 InvalidDecl = 3; 1817 else switch (Name.getNameKind()) { 1818 case DeclarationName::CXXConstructorName: 1819 InvalidDecl = 4; 1820 ShowDeclName = false; 1821 break; 1822 1823 case DeclarationName::CXXDestructorName: 1824 InvalidDecl = 5; 1825 ShowDeclName = false; 1826 break; 1827 1828 case DeclarationName::CXXOperatorName: 1829 case DeclarationName::CXXConversionFunctionName: 1830 InvalidDecl = 6; 1831 break; 1832 1833 default: 1834 InvalidDecl = 0; 1835 break; 1836 } 1837 1838 if (InvalidDecl) { 1839 if (ShowDeclName) 1840 Diag(Loc, diag::err_invalid_member_in_interface) 1841 << (InvalidDecl-1) << Name; 1842 else 1843 Diag(Loc, diag::err_invalid_member_in_interface) 1844 << (InvalidDecl-1) << ""; 1845 return 0; 1846 } 1847 } 1848 1849 // C++ 9.2p6: A member shall not be declared to have automatic storage 1850 // duration (auto, register) or with the extern storage-class-specifier. 1851 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1852 // data members and cannot be applied to names declared const or static, 1853 // and cannot be applied to reference members. 1854 switch (DS.getStorageClassSpec()) { 1855 case DeclSpec::SCS_unspecified: 1856 case DeclSpec::SCS_typedef: 1857 case DeclSpec::SCS_static: 1858 break; 1859 case DeclSpec::SCS_mutable: 1860 if (isFunc) { 1861 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1862 1863 // FIXME: It would be nicer if the keyword was ignored only for this 1864 // declarator. Otherwise we could get follow-up errors. 1865 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1866 } 1867 break; 1868 default: 1869 Diag(DS.getStorageClassSpecLoc(), 1870 diag::err_storageclass_invalid_for_member); 1871 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1872 break; 1873 } 1874 1875 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1876 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1877 !isFunc); 1878 1879 if (DS.isConstexprSpecified() && isInstField) { 1880 SemaDiagnosticBuilder B = 1881 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1882 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1883 if (InitStyle == ICIS_NoInit) { 1884 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1885 D.getMutableDeclSpec().ClearConstexprSpec(); 1886 const char *PrevSpec; 1887 unsigned DiagID; 1888 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1889 PrevSpec, DiagID, getLangOpts()); 1890 (void)Failed; 1891 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1892 } else { 1893 B << 1; 1894 const char *PrevSpec; 1895 unsigned DiagID; 1896 if (D.getMutableDeclSpec().SetStorageClassSpec( 1897 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1898 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1899 "This is the only DeclSpec that should fail to be applied"); 1900 B << 1; 1901 } else { 1902 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1903 isInstField = false; 1904 } 1905 } 1906 } 1907 1908 NamedDecl *Member; 1909 if (isInstField) { 1910 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1911 1912 // Data members must have identifiers for names. 1913 if (!Name.isIdentifier()) { 1914 Diag(Loc, diag::err_bad_variable_name) 1915 << Name; 1916 return 0; 1917 } 1918 1919 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1920 1921 // Member field could not be with "template" keyword. 1922 // So TemplateParameterLists should be empty in this case. 1923 if (TemplateParameterLists.size()) { 1924 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1925 if (TemplateParams->size()) { 1926 // There is no such thing as a member field template. 1927 Diag(D.getIdentifierLoc(), diag::err_template_member) 1928 << II 1929 << SourceRange(TemplateParams->getTemplateLoc(), 1930 TemplateParams->getRAngleLoc()); 1931 } else { 1932 // There is an extraneous 'template<>' for this member. 1933 Diag(TemplateParams->getTemplateLoc(), 1934 diag::err_template_member_noparams) 1935 << II 1936 << SourceRange(TemplateParams->getTemplateLoc(), 1937 TemplateParams->getRAngleLoc()); 1938 } 1939 return 0; 1940 } 1941 1942 if (SS.isSet() && !SS.isInvalid()) { 1943 // The user provided a superfluous scope specifier inside a class 1944 // definition: 1945 // 1946 // class X { 1947 // int X::member; 1948 // }; 1949 if (DeclContext *DC = computeDeclContext(SS, false)) 1950 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1951 else 1952 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1953 << Name << SS.getRange(); 1954 1955 SS.clear(); 1956 } 1957 1958 AttributeList *MSPropertyAttr = 1959 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1960 if (MSPropertyAttr) { 1961 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1962 BitWidth, InitStyle, AS, MSPropertyAttr); 1963 if (!Member) 1964 return 0; 1965 isInstField = false; 1966 } else { 1967 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1968 BitWidth, InitStyle, AS); 1969 assert(Member && "HandleField never returns null"); 1970 } 1971 } else { 1972 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1973 1974 Member = HandleDeclarator(S, D, TemplateParameterLists); 1975 if (!Member) 1976 return 0; 1977 1978 // Non-instance-fields can't have a bitfield. 1979 if (BitWidth) { 1980 if (Member->isInvalidDecl()) { 1981 // don't emit another diagnostic. 1982 } else if (isa<VarDecl>(Member)) { 1983 // C++ 9.6p3: A bit-field shall not be a static member. 1984 // "static member 'A' cannot be a bit-field" 1985 Diag(Loc, diag::err_static_not_bitfield) 1986 << Name << BitWidth->getSourceRange(); 1987 } else if (isa<TypedefDecl>(Member)) { 1988 // "typedef member 'x' cannot be a bit-field" 1989 Diag(Loc, diag::err_typedef_not_bitfield) 1990 << Name << BitWidth->getSourceRange(); 1991 } else { 1992 // A function typedef ("typedef int f(); f a;"). 1993 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1994 Diag(Loc, diag::err_not_integral_type_bitfield) 1995 << Name << cast<ValueDecl>(Member)->getType() 1996 << BitWidth->getSourceRange(); 1997 } 1998 1999 BitWidth = 0; 2000 Member->setInvalidDecl(); 2001 } 2002 2003 Member->setAccess(AS); 2004 2005 // If we have declared a member function template, set the access of the 2006 // templated declaration as well. 2007 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 2008 FunTmpl->getTemplatedDecl()->setAccess(AS); 2009 } 2010 2011 if (VS.isOverrideSpecified()) 2012 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 2013 if (VS.isFinalSpecified()) 2014 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 2015 2016 if (VS.getLastLocation().isValid()) { 2017 // Update the end location of a method that has a virt-specifiers. 2018 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 2019 MD->setRangeEnd(VS.getLastLocation()); 2020 } 2021 2022 CheckOverrideControl(Member); 2023 2024 assert((Name || isInstField) && "No identifier for non-field ?"); 2025 2026 if (isInstField) { 2027 FieldDecl *FD = cast<FieldDecl>(Member); 2028 FieldCollector->Add(FD); 2029 2030 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2031 FD->getLocation()) 2032 != DiagnosticsEngine::Ignored) { 2033 // Remember all explicit private FieldDecls that have a name, no side 2034 // effects and are not part of a dependent type declaration. 2035 if (!FD->isImplicit() && FD->getDeclName() && 2036 FD->getAccess() == AS_private && 2037 !FD->hasAttr<UnusedAttr>() && 2038 !FD->getParent()->isDependentContext() && 2039 !InitializationHasSideEffects(*FD)) 2040 UnusedPrivateFields.insert(FD); 2041 } 2042 } 2043 2044 return Member; 2045} 2046 2047namespace { 2048 class UninitializedFieldVisitor 2049 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2050 Sema &S; 2051 ValueDecl *VD; 2052 public: 2053 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2054 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2055 S(S) { 2056 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 2057 this->VD = IFD->getAnonField(); 2058 else 2059 this->VD = VD; 2060 } 2061 2062 void HandleExpr(Expr *E) { 2063 if (!E) return; 2064 2065 // Expressions like x(x) sometimes lack the surrounding expressions 2066 // but need to be checked anyways. 2067 HandleValue(E); 2068 Visit(E); 2069 } 2070 2071 void HandleValue(Expr *E) { 2072 E = E->IgnoreParens(); 2073 2074 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2075 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2076 return; 2077 2078 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2079 // or union. 2080 MemberExpr *FieldME = ME; 2081 2082 Expr *Base = E; 2083 while (isa<MemberExpr>(Base)) { 2084 ME = cast<MemberExpr>(Base); 2085 2086 if (isa<VarDecl>(ME->getMemberDecl())) 2087 return; 2088 2089 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2090 if (!FD->isAnonymousStructOrUnion()) 2091 FieldME = ME; 2092 2093 Base = ME->getBase(); 2094 } 2095 2096 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2097 unsigned diag = VD->getType()->isReferenceType() 2098 ? diag::warn_reference_field_is_uninit 2099 : diag::warn_field_is_uninit; 2100 S.Diag(FieldME->getExprLoc(), diag) << VD; 2101 } 2102 return; 2103 } 2104 2105 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2106 HandleValue(CO->getTrueExpr()); 2107 HandleValue(CO->getFalseExpr()); 2108 return; 2109 } 2110 2111 if (BinaryConditionalOperator *BCO = 2112 dyn_cast<BinaryConditionalOperator>(E)) { 2113 HandleValue(BCO->getCommon()); 2114 HandleValue(BCO->getFalseExpr()); 2115 return; 2116 } 2117 2118 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2119 switch (BO->getOpcode()) { 2120 default: 2121 return; 2122 case(BO_PtrMemD): 2123 case(BO_PtrMemI): 2124 HandleValue(BO->getLHS()); 2125 return; 2126 case(BO_Comma): 2127 HandleValue(BO->getRHS()); 2128 return; 2129 } 2130 } 2131 } 2132 2133 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2134 if (E->getCastKind() == CK_LValueToRValue) 2135 HandleValue(E->getSubExpr()); 2136 2137 Inherited::VisitImplicitCastExpr(E); 2138 } 2139 2140 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2141 Expr *Callee = E->getCallee(); 2142 if (isa<MemberExpr>(Callee)) 2143 HandleValue(Callee); 2144 2145 Inherited::VisitCXXMemberCallExpr(E); 2146 } 2147 }; 2148 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2149 ValueDecl *VD) { 2150 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2151 } 2152} // namespace 2153 2154/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2155/// in-class initializer for a non-static C++ class member, and after 2156/// instantiating an in-class initializer in a class template. Such actions 2157/// are deferred until the class is complete. 2158void 2159Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2160 Expr *InitExpr) { 2161 FieldDecl *FD = cast<FieldDecl>(D); 2162 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2163 "must set init style when field is created"); 2164 2165 if (!InitExpr) { 2166 FD->setInvalidDecl(); 2167 FD->removeInClassInitializer(); 2168 return; 2169 } 2170 2171 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2172 FD->setInvalidDecl(); 2173 FD->removeInClassInitializer(); 2174 return; 2175 } 2176 2177 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 2178 != DiagnosticsEngine::Ignored) { 2179 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 2180 } 2181 2182 ExprResult Init = InitExpr; 2183 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2184 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2185 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2186 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2187 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2188 InitializationSequence Seq(*this, Entity, Kind, InitExpr); 2189 Init = Seq.Perform(*this, Entity, Kind, InitExpr); 2190 if (Init.isInvalid()) { 2191 FD->setInvalidDecl(); 2192 return; 2193 } 2194 } 2195 2196 // C++11 [class.base.init]p7: 2197 // The initialization of each base and member constitutes a 2198 // full-expression. 2199 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2200 if (Init.isInvalid()) { 2201 FD->setInvalidDecl(); 2202 return; 2203 } 2204 2205 InitExpr = Init.release(); 2206 2207 FD->setInClassInitializer(InitExpr); 2208} 2209 2210/// \brief Find the direct and/or virtual base specifiers that 2211/// correspond to the given base type, for use in base initialization 2212/// within a constructor. 2213static bool FindBaseInitializer(Sema &SemaRef, 2214 CXXRecordDecl *ClassDecl, 2215 QualType BaseType, 2216 const CXXBaseSpecifier *&DirectBaseSpec, 2217 const CXXBaseSpecifier *&VirtualBaseSpec) { 2218 // First, check for a direct base class. 2219 DirectBaseSpec = 0; 2220 for (CXXRecordDecl::base_class_const_iterator Base 2221 = ClassDecl->bases_begin(); 2222 Base != ClassDecl->bases_end(); ++Base) { 2223 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2224 // We found a direct base of this type. That's what we're 2225 // initializing. 2226 DirectBaseSpec = &*Base; 2227 break; 2228 } 2229 } 2230 2231 // Check for a virtual base class. 2232 // FIXME: We might be able to short-circuit this if we know in advance that 2233 // there are no virtual bases. 2234 VirtualBaseSpec = 0; 2235 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2236 // We haven't found a base yet; search the class hierarchy for a 2237 // virtual base class. 2238 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2239 /*DetectVirtual=*/false); 2240 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2241 BaseType, Paths)) { 2242 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2243 Path != Paths.end(); ++Path) { 2244 if (Path->back().Base->isVirtual()) { 2245 VirtualBaseSpec = Path->back().Base; 2246 break; 2247 } 2248 } 2249 } 2250 } 2251 2252 return DirectBaseSpec || VirtualBaseSpec; 2253} 2254 2255/// \brief Handle a C++ member initializer using braced-init-list syntax. 2256MemInitResult 2257Sema::ActOnMemInitializer(Decl *ConstructorD, 2258 Scope *S, 2259 CXXScopeSpec &SS, 2260 IdentifierInfo *MemberOrBase, 2261 ParsedType TemplateTypeTy, 2262 const DeclSpec &DS, 2263 SourceLocation IdLoc, 2264 Expr *InitList, 2265 SourceLocation EllipsisLoc) { 2266 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2267 DS, IdLoc, InitList, 2268 EllipsisLoc); 2269} 2270 2271/// \brief Handle a C++ member initializer using parentheses syntax. 2272MemInitResult 2273Sema::ActOnMemInitializer(Decl *ConstructorD, 2274 Scope *S, 2275 CXXScopeSpec &SS, 2276 IdentifierInfo *MemberOrBase, 2277 ParsedType TemplateTypeTy, 2278 const DeclSpec &DS, 2279 SourceLocation IdLoc, 2280 SourceLocation LParenLoc, 2281 ArrayRef<Expr *> Args, 2282 SourceLocation RParenLoc, 2283 SourceLocation EllipsisLoc) { 2284 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2285 Args, RParenLoc); 2286 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2287 DS, IdLoc, List, EllipsisLoc); 2288} 2289 2290namespace { 2291 2292// Callback to only accept typo corrections that can be a valid C++ member 2293// intializer: either a non-static field member or a base class. 2294class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2295 public: 2296 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2297 : ClassDecl(ClassDecl) {} 2298 2299 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2300 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2301 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2302 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2303 else 2304 return isa<TypeDecl>(ND); 2305 } 2306 return false; 2307 } 2308 2309 private: 2310 CXXRecordDecl *ClassDecl; 2311}; 2312 2313} 2314 2315/// \brief Handle a C++ member initializer. 2316MemInitResult 2317Sema::BuildMemInitializer(Decl *ConstructorD, 2318 Scope *S, 2319 CXXScopeSpec &SS, 2320 IdentifierInfo *MemberOrBase, 2321 ParsedType TemplateTypeTy, 2322 const DeclSpec &DS, 2323 SourceLocation IdLoc, 2324 Expr *Init, 2325 SourceLocation EllipsisLoc) { 2326 if (!ConstructorD) 2327 return true; 2328 2329 AdjustDeclIfTemplate(ConstructorD); 2330 2331 CXXConstructorDecl *Constructor 2332 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2333 if (!Constructor) { 2334 // The user wrote a constructor initializer on a function that is 2335 // not a C++ constructor. Ignore the error for now, because we may 2336 // have more member initializers coming; we'll diagnose it just 2337 // once in ActOnMemInitializers. 2338 return true; 2339 } 2340 2341 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2342 2343 // C++ [class.base.init]p2: 2344 // Names in a mem-initializer-id are looked up in the scope of the 2345 // constructor's class and, if not found in that scope, are looked 2346 // up in the scope containing the constructor's definition. 2347 // [Note: if the constructor's class contains a member with the 2348 // same name as a direct or virtual base class of the class, a 2349 // mem-initializer-id naming the member or base class and composed 2350 // of a single identifier refers to the class member. A 2351 // mem-initializer-id for the hidden base class may be specified 2352 // using a qualified name. ] 2353 if (!SS.getScopeRep() && !TemplateTypeTy) { 2354 // Look for a member, first. 2355 DeclContext::lookup_result Result 2356 = ClassDecl->lookup(MemberOrBase); 2357 if (!Result.empty()) { 2358 ValueDecl *Member; 2359 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2360 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2361 if (EllipsisLoc.isValid()) 2362 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2363 << MemberOrBase 2364 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2365 2366 return BuildMemberInitializer(Member, Init, IdLoc); 2367 } 2368 } 2369 } 2370 // It didn't name a member, so see if it names a class. 2371 QualType BaseType; 2372 TypeSourceInfo *TInfo = 0; 2373 2374 if (TemplateTypeTy) { 2375 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2376 } else if (DS.getTypeSpecType() == TST_decltype) { 2377 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2378 } else { 2379 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2380 LookupParsedName(R, S, &SS); 2381 2382 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2383 if (!TyD) { 2384 if (R.isAmbiguous()) return true; 2385 2386 // We don't want access-control diagnostics here. 2387 R.suppressDiagnostics(); 2388 2389 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2390 bool NotUnknownSpecialization = false; 2391 DeclContext *DC = computeDeclContext(SS, false); 2392 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2393 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2394 2395 if (!NotUnknownSpecialization) { 2396 // When the scope specifier can refer to a member of an unknown 2397 // specialization, we take it as a type name. 2398 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2399 SS.getWithLocInContext(Context), 2400 *MemberOrBase, IdLoc); 2401 if (BaseType.isNull()) 2402 return true; 2403 2404 R.clear(); 2405 R.setLookupName(MemberOrBase); 2406 } 2407 } 2408 2409 // If no results were found, try to correct typos. 2410 TypoCorrection Corr; 2411 MemInitializerValidatorCCC Validator(ClassDecl); 2412 if (R.empty() && BaseType.isNull() && 2413 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2414 Validator, ClassDecl))) { 2415 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2416 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2417 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2418 // We have found a non-static data member with a similar 2419 // name to what was typed; complain and initialize that 2420 // member. 2421 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2422 << MemberOrBase << true << CorrectedQuotedStr 2423 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2424 Diag(Member->getLocation(), diag::note_previous_decl) 2425 << CorrectedQuotedStr; 2426 2427 return BuildMemberInitializer(Member, Init, IdLoc); 2428 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2429 const CXXBaseSpecifier *DirectBaseSpec; 2430 const CXXBaseSpecifier *VirtualBaseSpec; 2431 if (FindBaseInitializer(*this, ClassDecl, 2432 Context.getTypeDeclType(Type), 2433 DirectBaseSpec, VirtualBaseSpec)) { 2434 // We have found a direct or virtual base class with a 2435 // similar name to what was typed; complain and initialize 2436 // that base class. 2437 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2438 << MemberOrBase << false << CorrectedQuotedStr 2439 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2440 2441 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2442 : VirtualBaseSpec; 2443 Diag(BaseSpec->getLocStart(), 2444 diag::note_base_class_specified_here) 2445 << BaseSpec->getType() 2446 << BaseSpec->getSourceRange(); 2447 2448 TyD = Type; 2449 } 2450 } 2451 } 2452 2453 if (!TyD && BaseType.isNull()) { 2454 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2455 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2456 return true; 2457 } 2458 } 2459 2460 if (BaseType.isNull()) { 2461 BaseType = Context.getTypeDeclType(TyD); 2462 if (SS.isSet()) { 2463 NestedNameSpecifier *Qualifier = 2464 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2465 2466 // FIXME: preserve source range information 2467 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2468 } 2469 } 2470 } 2471 2472 if (!TInfo) 2473 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2474 2475 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2476} 2477 2478/// Checks a member initializer expression for cases where reference (or 2479/// pointer) members are bound to by-value parameters (or their addresses). 2480static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2481 Expr *Init, 2482 SourceLocation IdLoc) { 2483 QualType MemberTy = Member->getType(); 2484 2485 // We only handle pointers and references currently. 2486 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2487 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2488 return; 2489 2490 const bool IsPointer = MemberTy->isPointerType(); 2491 if (IsPointer) { 2492 if (const UnaryOperator *Op 2493 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2494 // The only case we're worried about with pointers requires taking the 2495 // address. 2496 if (Op->getOpcode() != UO_AddrOf) 2497 return; 2498 2499 Init = Op->getSubExpr(); 2500 } else { 2501 // We only handle address-of expression initializers for pointers. 2502 return; 2503 } 2504 } 2505 2506 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2507 // We only warn when referring to a non-reference parameter declaration. 2508 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2509 if (!Parameter || Parameter->getType()->isReferenceType()) 2510 return; 2511 2512 S.Diag(Init->getExprLoc(), 2513 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2514 : diag::warn_bind_ref_member_to_parameter) 2515 << Member << Parameter << Init->getSourceRange(); 2516 } else { 2517 // Other initializers are fine. 2518 return; 2519 } 2520 2521 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2522 << (unsigned)IsPointer; 2523} 2524 2525MemInitResult 2526Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2527 SourceLocation IdLoc) { 2528 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2529 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2530 assert((DirectMember || IndirectMember) && 2531 "Member must be a FieldDecl or IndirectFieldDecl"); 2532 2533 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2534 return true; 2535 2536 if (Member->isInvalidDecl()) 2537 return true; 2538 2539 // Diagnose value-uses of fields to initialize themselves, e.g. 2540 // foo(foo) 2541 // where foo is not also a parameter to the constructor. 2542 // TODO: implement -Wuninitialized and fold this into that framework. 2543 MultiExprArg Args; 2544 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2545 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2546 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2547 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); 2548 } else { 2549 // Template instantiation doesn't reconstruct ParenListExprs for us. 2550 Args = Init; 2551 } 2552 2553 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2554 != DiagnosticsEngine::Ignored) 2555 for (unsigned i = 0, e = Args.size(); i != e; ++i) 2556 // FIXME: Warn about the case when other fields are used before being 2557 // initialized. For example, let this field be the i'th field. When 2558 // initializing the i'th field, throw a warning if any of the >= i'th 2559 // fields are used, as they are not yet initialized. 2560 // Right now we are only handling the case where the i'th field uses 2561 // itself in its initializer. 2562 // Also need to take into account that some fields may be initialized by 2563 // in-class initializers, see C++11 [class.base.init]p9. 2564 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2565 2566 SourceRange InitRange = Init->getSourceRange(); 2567 2568 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2569 // Can't check initialization for a member of dependent type or when 2570 // any of the arguments are type-dependent expressions. 2571 DiscardCleanupsInEvaluationContext(); 2572 } else { 2573 bool InitList = false; 2574 if (isa<InitListExpr>(Init)) { 2575 InitList = true; 2576 Args = Init; 2577 } 2578 2579 // Initialize the member. 2580 InitializedEntity MemberEntity = 2581 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2582 : InitializedEntity::InitializeMember(IndirectMember, 0); 2583 InitializationKind Kind = 2584 InitList ? InitializationKind::CreateDirectList(IdLoc) 2585 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2586 InitRange.getEnd()); 2587 2588 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); 2589 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0); 2590 if (MemberInit.isInvalid()) 2591 return true; 2592 2593 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc); 2594 2595 // C++11 [class.base.init]p7: 2596 // The initialization of each base and member constitutes a 2597 // full-expression. 2598 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2599 if (MemberInit.isInvalid()) 2600 return true; 2601 2602 Init = MemberInit.get(); 2603 } 2604 2605 if (DirectMember) { 2606 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2607 InitRange.getBegin(), Init, 2608 InitRange.getEnd()); 2609 } else { 2610 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2611 InitRange.getBegin(), Init, 2612 InitRange.getEnd()); 2613 } 2614} 2615 2616MemInitResult 2617Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2618 CXXRecordDecl *ClassDecl) { 2619 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2620 if (!LangOpts.CPlusPlus11) 2621 return Diag(NameLoc, diag::err_delegating_ctor) 2622 << TInfo->getTypeLoc().getLocalSourceRange(); 2623 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2624 2625 bool InitList = true; 2626 MultiExprArg Args = Init; 2627 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2628 InitList = false; 2629 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2630 } 2631 2632 SourceRange InitRange = Init->getSourceRange(); 2633 // Initialize the object. 2634 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2635 QualType(ClassDecl->getTypeForDecl(), 0)); 2636 InitializationKind Kind = 2637 InitList ? InitializationKind::CreateDirectList(NameLoc) 2638 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2639 InitRange.getEnd()); 2640 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); 2641 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2642 Args, 0); 2643 if (DelegationInit.isInvalid()) 2644 return true; 2645 2646 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2647 "Delegating constructor with no target?"); 2648 2649 // C++11 [class.base.init]p7: 2650 // The initialization of each base and member constitutes a 2651 // full-expression. 2652 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2653 InitRange.getBegin()); 2654 if (DelegationInit.isInvalid()) 2655 return true; 2656 2657 // If we are in a dependent context, template instantiation will 2658 // perform this type-checking again. Just save the arguments that we 2659 // received in a ParenListExpr. 2660 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2661 // of the information that we have about the base 2662 // initializer. However, deconstructing the ASTs is a dicey process, 2663 // and this approach is far more likely to get the corner cases right. 2664 if (CurContext->isDependentContext()) 2665 DelegationInit = Owned(Init); 2666 2667 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2668 DelegationInit.takeAs<Expr>(), 2669 InitRange.getEnd()); 2670} 2671 2672MemInitResult 2673Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2674 Expr *Init, CXXRecordDecl *ClassDecl, 2675 SourceLocation EllipsisLoc) { 2676 SourceLocation BaseLoc 2677 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2678 2679 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2680 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2681 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2682 2683 // C++ [class.base.init]p2: 2684 // [...] Unless the mem-initializer-id names a nonstatic data 2685 // member of the constructor's class or a direct or virtual base 2686 // of that class, the mem-initializer is ill-formed. A 2687 // mem-initializer-list can initialize a base class using any 2688 // name that denotes that base class type. 2689 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2690 2691 SourceRange InitRange = Init->getSourceRange(); 2692 if (EllipsisLoc.isValid()) { 2693 // This is a pack expansion. 2694 if (!BaseType->containsUnexpandedParameterPack()) { 2695 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2696 << SourceRange(BaseLoc, InitRange.getEnd()); 2697 2698 EllipsisLoc = SourceLocation(); 2699 } 2700 } else { 2701 // Check for any unexpanded parameter packs. 2702 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2703 return true; 2704 2705 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2706 return true; 2707 } 2708 2709 // Check for direct and virtual base classes. 2710 const CXXBaseSpecifier *DirectBaseSpec = 0; 2711 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2712 if (!Dependent) { 2713 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2714 BaseType)) 2715 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2716 2717 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2718 VirtualBaseSpec); 2719 2720 // C++ [base.class.init]p2: 2721 // Unless the mem-initializer-id names a nonstatic data member of the 2722 // constructor's class or a direct or virtual base of that class, the 2723 // mem-initializer is ill-formed. 2724 if (!DirectBaseSpec && !VirtualBaseSpec) { 2725 // If the class has any dependent bases, then it's possible that 2726 // one of those types will resolve to the same type as 2727 // BaseType. Therefore, just treat this as a dependent base 2728 // class initialization. FIXME: Should we try to check the 2729 // initialization anyway? It seems odd. 2730 if (ClassDecl->hasAnyDependentBases()) 2731 Dependent = true; 2732 else 2733 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2734 << BaseType << Context.getTypeDeclType(ClassDecl) 2735 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2736 } 2737 } 2738 2739 if (Dependent) { 2740 DiscardCleanupsInEvaluationContext(); 2741 2742 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2743 /*IsVirtual=*/false, 2744 InitRange.getBegin(), Init, 2745 InitRange.getEnd(), EllipsisLoc); 2746 } 2747 2748 // C++ [base.class.init]p2: 2749 // If a mem-initializer-id is ambiguous because it designates both 2750 // a direct non-virtual base class and an inherited virtual base 2751 // class, the mem-initializer is ill-formed. 2752 if (DirectBaseSpec && VirtualBaseSpec) 2753 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2754 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2755 2756 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2757 if (!BaseSpec) 2758 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2759 2760 // Initialize the base. 2761 bool InitList = true; 2762 MultiExprArg Args = Init; 2763 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2764 InitList = false; 2765 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2766 } 2767 2768 InitializedEntity BaseEntity = 2769 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2770 InitializationKind Kind = 2771 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2772 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2773 InitRange.getEnd()); 2774 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); 2775 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0); 2776 if (BaseInit.isInvalid()) 2777 return true; 2778 2779 // C++11 [class.base.init]p7: 2780 // The initialization of each base and member constitutes a 2781 // full-expression. 2782 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2783 if (BaseInit.isInvalid()) 2784 return true; 2785 2786 // If we are in a dependent context, template instantiation will 2787 // perform this type-checking again. Just save the arguments that we 2788 // received in a ParenListExpr. 2789 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2790 // of the information that we have about the base 2791 // initializer. However, deconstructing the ASTs is a dicey process, 2792 // and this approach is far more likely to get the corner cases right. 2793 if (CurContext->isDependentContext()) 2794 BaseInit = Owned(Init); 2795 2796 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2797 BaseSpec->isVirtual(), 2798 InitRange.getBegin(), 2799 BaseInit.takeAs<Expr>(), 2800 InitRange.getEnd(), EllipsisLoc); 2801} 2802 2803// Create a static_cast\<T&&>(expr). 2804static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2805 if (T.isNull()) T = E->getType(); 2806 QualType TargetType = SemaRef.BuildReferenceType( 2807 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2808 SourceLocation ExprLoc = E->getLocStart(); 2809 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2810 TargetType, ExprLoc); 2811 2812 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2813 SourceRange(ExprLoc, ExprLoc), 2814 E->getSourceRange()).take(); 2815} 2816 2817/// ImplicitInitializerKind - How an implicit base or member initializer should 2818/// initialize its base or member. 2819enum ImplicitInitializerKind { 2820 IIK_Default, 2821 IIK_Copy, 2822 IIK_Move, 2823 IIK_Inherit 2824}; 2825 2826static bool 2827BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2828 ImplicitInitializerKind ImplicitInitKind, 2829 CXXBaseSpecifier *BaseSpec, 2830 bool IsInheritedVirtualBase, 2831 CXXCtorInitializer *&CXXBaseInit) { 2832 InitializedEntity InitEntity 2833 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2834 IsInheritedVirtualBase); 2835 2836 ExprResult BaseInit; 2837 2838 switch (ImplicitInitKind) { 2839 case IIK_Inherit: { 2840 const CXXRecordDecl *Inherited = 2841 Constructor->getInheritedConstructor()->getParent(); 2842 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2843 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2844 // C++11 [class.inhctor]p8: 2845 // Each expression in the expression-list is of the form 2846 // static_cast<T&&>(p), where p is the name of the corresponding 2847 // constructor parameter and T is the declared type of p. 2848 SmallVector<Expr*, 16> Args; 2849 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2850 ParmVarDecl *PD = Constructor->getParamDecl(I); 2851 ExprResult ArgExpr = 2852 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2853 VK_LValue, SourceLocation()); 2854 if (ArgExpr.isInvalid()) 2855 return true; 2856 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2857 } 2858 2859 InitializationKind InitKind = InitializationKind::CreateDirect( 2860 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2861 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args); 2862 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2863 break; 2864 } 2865 } 2866 // Fall through. 2867 case IIK_Default: { 2868 InitializationKind InitKind 2869 = InitializationKind::CreateDefault(Constructor->getLocation()); 2870 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 2871 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 2872 break; 2873 } 2874 2875 case IIK_Move: 2876 case IIK_Copy: { 2877 bool Moving = ImplicitInitKind == IIK_Move; 2878 ParmVarDecl *Param = Constructor->getParamDecl(0); 2879 QualType ParamType = Param->getType().getNonReferenceType(); 2880 2881 Expr *CopyCtorArg = 2882 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2883 SourceLocation(), Param, false, 2884 Constructor->getLocation(), ParamType, 2885 VK_LValue, 0); 2886 2887 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2888 2889 // Cast to the base class to avoid ambiguities. 2890 QualType ArgTy = 2891 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2892 ParamType.getQualifiers()); 2893 2894 if (Moving) { 2895 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2896 } 2897 2898 CXXCastPath BasePath; 2899 BasePath.push_back(BaseSpec); 2900 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2901 CK_UncheckedDerivedToBase, 2902 Moving ? VK_XValue : VK_LValue, 2903 &BasePath).take(); 2904 2905 InitializationKind InitKind 2906 = InitializationKind::CreateDirect(Constructor->getLocation(), 2907 SourceLocation(), SourceLocation()); 2908 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); 2909 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); 2910 break; 2911 } 2912 } 2913 2914 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2915 if (BaseInit.isInvalid()) 2916 return true; 2917 2918 CXXBaseInit = 2919 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2920 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2921 SourceLocation()), 2922 BaseSpec->isVirtual(), 2923 SourceLocation(), 2924 BaseInit.takeAs<Expr>(), 2925 SourceLocation(), 2926 SourceLocation()); 2927 2928 return false; 2929} 2930 2931static bool RefersToRValueRef(Expr *MemRef) { 2932 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2933 return Referenced->getType()->isRValueReferenceType(); 2934} 2935 2936static bool 2937BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2938 ImplicitInitializerKind ImplicitInitKind, 2939 FieldDecl *Field, IndirectFieldDecl *Indirect, 2940 CXXCtorInitializer *&CXXMemberInit) { 2941 if (Field->isInvalidDecl()) 2942 return true; 2943 2944 SourceLocation Loc = Constructor->getLocation(); 2945 2946 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2947 bool Moving = ImplicitInitKind == IIK_Move; 2948 ParmVarDecl *Param = Constructor->getParamDecl(0); 2949 QualType ParamType = Param->getType().getNonReferenceType(); 2950 2951 // Suppress copying zero-width bitfields. 2952 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2953 return false; 2954 2955 Expr *MemberExprBase = 2956 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2957 SourceLocation(), Param, false, 2958 Loc, ParamType, VK_LValue, 0); 2959 2960 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2961 2962 if (Moving) { 2963 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2964 } 2965 2966 // Build a reference to this field within the parameter. 2967 CXXScopeSpec SS; 2968 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2969 Sema::LookupMemberName); 2970 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2971 : cast<ValueDecl>(Field), AS_public); 2972 MemberLookup.resolveKind(); 2973 ExprResult CtorArg 2974 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2975 ParamType, Loc, 2976 /*IsArrow=*/false, 2977 SS, 2978 /*TemplateKWLoc=*/SourceLocation(), 2979 /*FirstQualifierInScope=*/0, 2980 MemberLookup, 2981 /*TemplateArgs=*/0); 2982 if (CtorArg.isInvalid()) 2983 return true; 2984 2985 // C++11 [class.copy]p15: 2986 // - if a member m has rvalue reference type T&&, it is direct-initialized 2987 // with static_cast<T&&>(x.m); 2988 if (RefersToRValueRef(CtorArg.get())) { 2989 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2990 } 2991 2992 // When the field we are copying is an array, create index variables for 2993 // each dimension of the array. We use these index variables to subscript 2994 // the source array, and other clients (e.g., CodeGen) will perform the 2995 // necessary iteration with these index variables. 2996 SmallVector<VarDecl *, 4> IndexVariables; 2997 QualType BaseType = Field->getType(); 2998 QualType SizeType = SemaRef.Context.getSizeType(); 2999 bool InitializingArray = false; 3000 while (const ConstantArrayType *Array 3001 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 3002 InitializingArray = true; 3003 // Create the iteration variable for this array index. 3004 IdentifierInfo *IterationVarName = 0; 3005 { 3006 SmallString<8> Str; 3007 llvm::raw_svector_ostream OS(Str); 3008 OS << "__i" << IndexVariables.size(); 3009 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 3010 } 3011 VarDecl *IterationVar 3012 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 3013 IterationVarName, SizeType, 3014 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 3015 SC_None); 3016 IndexVariables.push_back(IterationVar); 3017 3018 // Create a reference to the iteration variable. 3019 ExprResult IterationVarRef 3020 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 3021 assert(!IterationVarRef.isInvalid() && 3022 "Reference to invented variable cannot fail!"); 3023 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 3024 assert(!IterationVarRef.isInvalid() && 3025 "Conversion of invented variable cannot fail!"); 3026 3027 // Subscript the array with this iteration variable. 3028 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3029 IterationVarRef.take(), 3030 Loc); 3031 if (CtorArg.isInvalid()) 3032 return true; 3033 3034 BaseType = Array->getElementType(); 3035 } 3036 3037 // The array subscript expression is an lvalue, which is wrong for moving. 3038 if (Moving && InitializingArray) 3039 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3040 3041 // Construct the entity that we will be initializing. For an array, this 3042 // will be first element in the array, which may require several levels 3043 // of array-subscript entities. 3044 SmallVector<InitializedEntity, 4> Entities; 3045 Entities.reserve(1 + IndexVariables.size()); 3046 if (Indirect) 3047 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3048 else 3049 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3050 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3051 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3052 0, 3053 Entities.back())); 3054 3055 // Direct-initialize to use the copy constructor. 3056 InitializationKind InitKind = 3057 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3058 3059 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3060 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE); 3061 3062 ExprResult MemberInit 3063 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3064 MultiExprArg(&CtorArgE, 1)); 3065 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3066 if (MemberInit.isInvalid()) 3067 return true; 3068 3069 if (Indirect) { 3070 assert(IndexVariables.size() == 0 && 3071 "Indirect field improperly initialized"); 3072 CXXMemberInit 3073 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3074 Loc, Loc, 3075 MemberInit.takeAs<Expr>(), 3076 Loc); 3077 } else 3078 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3079 Loc, MemberInit.takeAs<Expr>(), 3080 Loc, 3081 IndexVariables.data(), 3082 IndexVariables.size()); 3083 return false; 3084 } 3085 3086 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3087 "Unhandled implicit init kind!"); 3088 3089 QualType FieldBaseElementType = 3090 SemaRef.Context.getBaseElementType(Field->getType()); 3091 3092 if (FieldBaseElementType->isRecordType()) { 3093 InitializedEntity InitEntity 3094 = Indirect? InitializedEntity::InitializeMember(Indirect) 3095 : InitializedEntity::InitializeMember(Field); 3096 InitializationKind InitKind = 3097 InitializationKind::CreateDefault(Loc); 3098 3099 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3100 ExprResult MemberInit = 3101 InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3102 3103 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3104 if (MemberInit.isInvalid()) 3105 return true; 3106 3107 if (Indirect) 3108 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3109 Indirect, Loc, 3110 Loc, 3111 MemberInit.get(), 3112 Loc); 3113 else 3114 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3115 Field, Loc, Loc, 3116 MemberInit.get(), 3117 Loc); 3118 return false; 3119 } 3120 3121 if (!Field->getParent()->isUnion()) { 3122 if (FieldBaseElementType->isReferenceType()) { 3123 SemaRef.Diag(Constructor->getLocation(), 3124 diag::err_uninitialized_member_in_ctor) 3125 << (int)Constructor->isImplicit() 3126 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3127 << 0 << Field->getDeclName(); 3128 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3129 return true; 3130 } 3131 3132 if (FieldBaseElementType.isConstQualified()) { 3133 SemaRef.Diag(Constructor->getLocation(), 3134 diag::err_uninitialized_member_in_ctor) 3135 << (int)Constructor->isImplicit() 3136 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3137 << 1 << Field->getDeclName(); 3138 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3139 return true; 3140 } 3141 } 3142 3143 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3144 FieldBaseElementType->isObjCRetainableType() && 3145 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3146 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3147 // ARC: 3148 // Default-initialize Objective-C pointers to NULL. 3149 CXXMemberInit 3150 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3151 Loc, Loc, 3152 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3153 Loc); 3154 return false; 3155 } 3156 3157 // Nothing to initialize. 3158 CXXMemberInit = 0; 3159 return false; 3160} 3161 3162namespace { 3163struct BaseAndFieldInfo { 3164 Sema &S; 3165 CXXConstructorDecl *Ctor; 3166 bool AnyErrorsInInits; 3167 ImplicitInitializerKind IIK; 3168 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3169 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3170 3171 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3172 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3173 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3174 if (Generated && Ctor->isCopyConstructor()) 3175 IIK = IIK_Copy; 3176 else if (Generated && Ctor->isMoveConstructor()) 3177 IIK = IIK_Move; 3178 else if (Ctor->getInheritedConstructor()) 3179 IIK = IIK_Inherit; 3180 else 3181 IIK = IIK_Default; 3182 } 3183 3184 bool isImplicitCopyOrMove() const { 3185 switch (IIK) { 3186 case IIK_Copy: 3187 case IIK_Move: 3188 return true; 3189 3190 case IIK_Default: 3191 case IIK_Inherit: 3192 return false; 3193 } 3194 3195 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3196 } 3197 3198 bool addFieldInitializer(CXXCtorInitializer *Init) { 3199 AllToInit.push_back(Init); 3200 3201 // Check whether this initializer makes the field "used". 3202 if (Init->getInit()->HasSideEffects(S.Context)) 3203 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3204 3205 return false; 3206 } 3207}; 3208} 3209 3210/// \brief Determine whether the given indirect field declaration is somewhere 3211/// within an anonymous union. 3212static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3213 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3214 CEnd = F->chain_end(); 3215 C != CEnd; ++C) 3216 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3217 if (Record->isUnion()) 3218 return true; 3219 3220 return false; 3221} 3222 3223/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3224/// array type. 3225static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3226 if (T->isIncompleteArrayType()) 3227 return true; 3228 3229 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3230 if (!ArrayT->getSize()) 3231 return true; 3232 3233 T = ArrayT->getElementType(); 3234 } 3235 3236 return false; 3237} 3238 3239static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3240 FieldDecl *Field, 3241 IndirectFieldDecl *Indirect = 0) { 3242 if (Field->isInvalidDecl()) 3243 return false; 3244 3245 // Overwhelmingly common case: we have a direct initializer for this field. 3246 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3247 return Info.addFieldInitializer(Init); 3248 3249 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3250 // has a brace-or-equal-initializer, the entity is initialized as specified 3251 // in [dcl.init]. 3252 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3253 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3254 Info.Ctor->getLocation(), Field); 3255 CXXCtorInitializer *Init; 3256 if (Indirect) 3257 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3258 SourceLocation(), 3259 SourceLocation(), DIE, 3260 SourceLocation()); 3261 else 3262 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3263 SourceLocation(), 3264 SourceLocation(), DIE, 3265 SourceLocation()); 3266 return Info.addFieldInitializer(Init); 3267 } 3268 3269 // Don't build an implicit initializer for union members if none was 3270 // explicitly specified. 3271 if (Field->getParent()->isUnion() || 3272 (Indirect && isWithinAnonymousUnion(Indirect))) 3273 return false; 3274 3275 // Don't initialize incomplete or zero-length arrays. 3276 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3277 return false; 3278 3279 // Don't try to build an implicit initializer if there were semantic 3280 // errors in any of the initializers (and therefore we might be 3281 // missing some that the user actually wrote). 3282 if (Info.AnyErrorsInInits) 3283 return false; 3284 3285 CXXCtorInitializer *Init = 0; 3286 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3287 Indirect, Init)) 3288 return true; 3289 3290 if (!Init) 3291 return false; 3292 3293 return Info.addFieldInitializer(Init); 3294} 3295 3296bool 3297Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3298 CXXCtorInitializer *Initializer) { 3299 assert(Initializer->isDelegatingInitializer()); 3300 Constructor->setNumCtorInitializers(1); 3301 CXXCtorInitializer **initializer = 3302 new (Context) CXXCtorInitializer*[1]; 3303 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3304 Constructor->setCtorInitializers(initializer); 3305 3306 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3307 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3308 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3309 } 3310 3311 DelegatingCtorDecls.push_back(Constructor); 3312 3313 return false; 3314} 3315 3316bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3317 ArrayRef<CXXCtorInitializer *> Initializers) { 3318 if (Constructor->isDependentContext()) { 3319 // Just store the initializers as written, they will be checked during 3320 // instantiation. 3321 if (!Initializers.empty()) { 3322 Constructor->setNumCtorInitializers(Initializers.size()); 3323 CXXCtorInitializer **baseOrMemberInitializers = 3324 new (Context) CXXCtorInitializer*[Initializers.size()]; 3325 memcpy(baseOrMemberInitializers, Initializers.data(), 3326 Initializers.size() * sizeof(CXXCtorInitializer*)); 3327 Constructor->setCtorInitializers(baseOrMemberInitializers); 3328 } 3329 3330 // Let template instantiation know whether we had errors. 3331 if (AnyErrors) 3332 Constructor->setInvalidDecl(); 3333 3334 return false; 3335 } 3336 3337 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3338 3339 // We need to build the initializer AST according to order of construction 3340 // and not what user specified in the Initializers list. 3341 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3342 if (!ClassDecl) 3343 return true; 3344 3345 bool HadError = false; 3346 3347 for (unsigned i = 0; i < Initializers.size(); i++) { 3348 CXXCtorInitializer *Member = Initializers[i]; 3349 3350 if (Member->isBaseInitializer()) 3351 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3352 else 3353 Info.AllBaseFields[Member->getAnyMember()] = Member; 3354 } 3355 3356 // Keep track of the direct virtual bases. 3357 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3358 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3359 E = ClassDecl->bases_end(); I != E; ++I) { 3360 if (I->isVirtual()) 3361 DirectVBases.insert(I); 3362 } 3363 3364 // Push virtual bases before others. 3365 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3366 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3367 3368 if (CXXCtorInitializer *Value 3369 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3370 Info.AllToInit.push_back(Value); 3371 } else if (!AnyErrors) { 3372 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3373 CXXCtorInitializer *CXXBaseInit; 3374 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3375 VBase, IsInheritedVirtualBase, 3376 CXXBaseInit)) { 3377 HadError = true; 3378 continue; 3379 } 3380 3381 Info.AllToInit.push_back(CXXBaseInit); 3382 } 3383 } 3384 3385 // Non-virtual bases. 3386 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3387 E = ClassDecl->bases_end(); Base != E; ++Base) { 3388 // Virtuals are in the virtual base list and already constructed. 3389 if (Base->isVirtual()) 3390 continue; 3391 3392 if (CXXCtorInitializer *Value 3393 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3394 Info.AllToInit.push_back(Value); 3395 } else if (!AnyErrors) { 3396 CXXCtorInitializer *CXXBaseInit; 3397 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3398 Base, /*IsInheritedVirtualBase=*/false, 3399 CXXBaseInit)) { 3400 HadError = true; 3401 continue; 3402 } 3403 3404 Info.AllToInit.push_back(CXXBaseInit); 3405 } 3406 } 3407 3408 // Fields. 3409 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3410 MemEnd = ClassDecl->decls_end(); 3411 Mem != MemEnd; ++Mem) { 3412 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3413 // C++ [class.bit]p2: 3414 // A declaration for a bit-field that omits the identifier declares an 3415 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3416 // initialized. 3417 if (F->isUnnamedBitfield()) 3418 continue; 3419 3420 // If we're not generating the implicit copy/move constructor, then we'll 3421 // handle anonymous struct/union fields based on their individual 3422 // indirect fields. 3423 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3424 continue; 3425 3426 if (CollectFieldInitializer(*this, Info, F)) 3427 HadError = true; 3428 continue; 3429 } 3430 3431 // Beyond this point, we only consider default initialization. 3432 if (Info.isImplicitCopyOrMove()) 3433 continue; 3434 3435 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3436 if (F->getType()->isIncompleteArrayType()) { 3437 assert(ClassDecl->hasFlexibleArrayMember() && 3438 "Incomplete array type is not valid"); 3439 continue; 3440 } 3441 3442 // Initialize each field of an anonymous struct individually. 3443 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3444 HadError = true; 3445 3446 continue; 3447 } 3448 } 3449 3450 unsigned NumInitializers = Info.AllToInit.size(); 3451 if (NumInitializers > 0) { 3452 Constructor->setNumCtorInitializers(NumInitializers); 3453 CXXCtorInitializer **baseOrMemberInitializers = 3454 new (Context) CXXCtorInitializer*[NumInitializers]; 3455 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3456 NumInitializers * sizeof(CXXCtorInitializer*)); 3457 Constructor->setCtorInitializers(baseOrMemberInitializers); 3458 3459 // Constructors implicitly reference the base and member 3460 // destructors. 3461 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3462 Constructor->getParent()); 3463 } 3464 3465 return HadError; 3466} 3467 3468static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3469 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3470 const RecordDecl *RD = RT->getDecl(); 3471 if (RD->isAnonymousStructOrUnion()) { 3472 for (RecordDecl::field_iterator Field = RD->field_begin(), 3473 E = RD->field_end(); Field != E; ++Field) 3474 PopulateKeysForFields(*Field, IdealInits); 3475 return; 3476 } 3477 } 3478 IdealInits.push_back(Field); 3479} 3480 3481static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3482 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3483} 3484 3485static void *GetKeyForMember(ASTContext &Context, 3486 CXXCtorInitializer *Member) { 3487 if (!Member->isAnyMemberInitializer()) 3488 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3489 3490 return Member->getAnyMember(); 3491} 3492 3493static void DiagnoseBaseOrMemInitializerOrder( 3494 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3495 ArrayRef<CXXCtorInitializer *> Inits) { 3496 if (Constructor->getDeclContext()->isDependentContext()) 3497 return; 3498 3499 // Don't check initializers order unless the warning is enabled at the 3500 // location of at least one initializer. 3501 bool ShouldCheckOrder = false; 3502 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3503 CXXCtorInitializer *Init = Inits[InitIndex]; 3504 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3505 Init->getSourceLocation()) 3506 != DiagnosticsEngine::Ignored) { 3507 ShouldCheckOrder = true; 3508 break; 3509 } 3510 } 3511 if (!ShouldCheckOrder) 3512 return; 3513 3514 // Build the list of bases and members in the order that they'll 3515 // actually be initialized. The explicit initializers should be in 3516 // this same order but may be missing things. 3517 SmallVector<const void*, 32> IdealInitKeys; 3518 3519 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3520 3521 // 1. Virtual bases. 3522 for (CXXRecordDecl::base_class_const_iterator VBase = 3523 ClassDecl->vbases_begin(), 3524 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3525 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3526 3527 // 2. Non-virtual bases. 3528 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3529 E = ClassDecl->bases_end(); Base != E; ++Base) { 3530 if (Base->isVirtual()) 3531 continue; 3532 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3533 } 3534 3535 // 3. Direct fields. 3536 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3537 E = ClassDecl->field_end(); Field != E; ++Field) { 3538 if (Field->isUnnamedBitfield()) 3539 continue; 3540 3541 PopulateKeysForFields(*Field, IdealInitKeys); 3542 } 3543 3544 unsigned NumIdealInits = IdealInitKeys.size(); 3545 unsigned IdealIndex = 0; 3546 3547 CXXCtorInitializer *PrevInit = 0; 3548 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3549 CXXCtorInitializer *Init = Inits[InitIndex]; 3550 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3551 3552 // Scan forward to try to find this initializer in the idealized 3553 // initializers list. 3554 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3555 if (InitKey == IdealInitKeys[IdealIndex]) 3556 break; 3557 3558 // If we didn't find this initializer, it must be because we 3559 // scanned past it on a previous iteration. That can only 3560 // happen if we're out of order; emit a warning. 3561 if (IdealIndex == NumIdealInits && PrevInit) { 3562 Sema::SemaDiagnosticBuilder D = 3563 SemaRef.Diag(PrevInit->getSourceLocation(), 3564 diag::warn_initializer_out_of_order); 3565 3566 if (PrevInit->isAnyMemberInitializer()) 3567 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3568 else 3569 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3570 3571 if (Init->isAnyMemberInitializer()) 3572 D << 0 << Init->getAnyMember()->getDeclName(); 3573 else 3574 D << 1 << Init->getTypeSourceInfo()->getType(); 3575 3576 // Move back to the initializer's location in the ideal list. 3577 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3578 if (InitKey == IdealInitKeys[IdealIndex]) 3579 break; 3580 3581 assert(IdealIndex != NumIdealInits && 3582 "initializer not found in initializer list"); 3583 } 3584 3585 PrevInit = Init; 3586 } 3587} 3588 3589namespace { 3590bool CheckRedundantInit(Sema &S, 3591 CXXCtorInitializer *Init, 3592 CXXCtorInitializer *&PrevInit) { 3593 if (!PrevInit) { 3594 PrevInit = Init; 3595 return false; 3596 } 3597 3598 if (FieldDecl *Field = Init->getAnyMember()) 3599 S.Diag(Init->getSourceLocation(), 3600 diag::err_multiple_mem_initialization) 3601 << Field->getDeclName() 3602 << Init->getSourceRange(); 3603 else { 3604 const Type *BaseClass = Init->getBaseClass(); 3605 assert(BaseClass && "neither field nor base"); 3606 S.Diag(Init->getSourceLocation(), 3607 diag::err_multiple_base_initialization) 3608 << QualType(BaseClass, 0) 3609 << Init->getSourceRange(); 3610 } 3611 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3612 << 0 << PrevInit->getSourceRange(); 3613 3614 return true; 3615} 3616 3617typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3618typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3619 3620bool CheckRedundantUnionInit(Sema &S, 3621 CXXCtorInitializer *Init, 3622 RedundantUnionMap &Unions) { 3623 FieldDecl *Field = Init->getAnyMember(); 3624 RecordDecl *Parent = Field->getParent(); 3625 NamedDecl *Child = Field; 3626 3627 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3628 if (Parent->isUnion()) { 3629 UnionEntry &En = Unions[Parent]; 3630 if (En.first && En.first != Child) { 3631 S.Diag(Init->getSourceLocation(), 3632 diag::err_multiple_mem_union_initialization) 3633 << Field->getDeclName() 3634 << Init->getSourceRange(); 3635 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3636 << 0 << En.second->getSourceRange(); 3637 return true; 3638 } 3639 if (!En.first) { 3640 En.first = Child; 3641 En.second = Init; 3642 } 3643 if (!Parent->isAnonymousStructOrUnion()) 3644 return false; 3645 } 3646 3647 Child = Parent; 3648 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3649 } 3650 3651 return false; 3652} 3653} 3654 3655/// ActOnMemInitializers - Handle the member initializers for a constructor. 3656void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3657 SourceLocation ColonLoc, 3658 ArrayRef<CXXCtorInitializer*> MemInits, 3659 bool AnyErrors) { 3660 if (!ConstructorDecl) 3661 return; 3662 3663 AdjustDeclIfTemplate(ConstructorDecl); 3664 3665 CXXConstructorDecl *Constructor 3666 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3667 3668 if (!Constructor) { 3669 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3670 return; 3671 } 3672 3673 // Mapping for the duplicate initializers check. 3674 // For member initializers, this is keyed with a FieldDecl*. 3675 // For base initializers, this is keyed with a Type*. 3676 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3677 3678 // Mapping for the inconsistent anonymous-union initializers check. 3679 RedundantUnionMap MemberUnions; 3680 3681 bool HadError = false; 3682 for (unsigned i = 0; i < MemInits.size(); i++) { 3683 CXXCtorInitializer *Init = MemInits[i]; 3684 3685 // Set the source order index. 3686 Init->setSourceOrder(i); 3687 3688 if (Init->isAnyMemberInitializer()) { 3689 FieldDecl *Field = Init->getAnyMember(); 3690 if (CheckRedundantInit(*this, Init, Members[Field]) || 3691 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3692 HadError = true; 3693 } else if (Init->isBaseInitializer()) { 3694 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3695 if (CheckRedundantInit(*this, Init, Members[Key])) 3696 HadError = true; 3697 } else { 3698 assert(Init->isDelegatingInitializer()); 3699 // This must be the only initializer 3700 if (MemInits.size() != 1) { 3701 Diag(Init->getSourceLocation(), 3702 diag::err_delegating_initializer_alone) 3703 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3704 // We will treat this as being the only initializer. 3705 } 3706 SetDelegatingInitializer(Constructor, MemInits[i]); 3707 // Return immediately as the initializer is set. 3708 return; 3709 } 3710 } 3711 3712 if (HadError) 3713 return; 3714 3715 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3716 3717 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3718} 3719 3720void 3721Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3722 CXXRecordDecl *ClassDecl) { 3723 // Ignore dependent contexts. Also ignore unions, since their members never 3724 // have destructors implicitly called. 3725 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3726 return; 3727 3728 // FIXME: all the access-control diagnostics are positioned on the 3729 // field/base declaration. That's probably good; that said, the 3730 // user might reasonably want to know why the destructor is being 3731 // emitted, and we currently don't say. 3732 3733 // Non-static data members. 3734 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3735 E = ClassDecl->field_end(); I != E; ++I) { 3736 FieldDecl *Field = *I; 3737 if (Field->isInvalidDecl()) 3738 continue; 3739 3740 // Don't destroy incomplete or zero-length arrays. 3741 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3742 continue; 3743 3744 QualType FieldType = Context.getBaseElementType(Field->getType()); 3745 3746 const RecordType* RT = FieldType->getAs<RecordType>(); 3747 if (!RT) 3748 continue; 3749 3750 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3751 if (FieldClassDecl->isInvalidDecl()) 3752 continue; 3753 if (FieldClassDecl->hasIrrelevantDestructor()) 3754 continue; 3755 // The destructor for an implicit anonymous union member is never invoked. 3756 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3757 continue; 3758 3759 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3760 assert(Dtor && "No dtor found for FieldClassDecl!"); 3761 CheckDestructorAccess(Field->getLocation(), Dtor, 3762 PDiag(diag::err_access_dtor_field) 3763 << Field->getDeclName() 3764 << FieldType); 3765 3766 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3767 DiagnoseUseOfDecl(Dtor, Location); 3768 } 3769 3770 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3771 3772 // Bases. 3773 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3774 E = ClassDecl->bases_end(); Base != E; ++Base) { 3775 // Bases are always records in a well-formed non-dependent class. 3776 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3777 3778 // Remember direct virtual bases. 3779 if (Base->isVirtual()) 3780 DirectVirtualBases.insert(RT); 3781 3782 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3783 // If our base class is invalid, we probably can't get its dtor anyway. 3784 if (BaseClassDecl->isInvalidDecl()) 3785 continue; 3786 if (BaseClassDecl->hasIrrelevantDestructor()) 3787 continue; 3788 3789 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3790 assert(Dtor && "No dtor found for BaseClassDecl!"); 3791 3792 // FIXME: caret should be on the start of the class name 3793 CheckDestructorAccess(Base->getLocStart(), Dtor, 3794 PDiag(diag::err_access_dtor_base) 3795 << Base->getType() 3796 << Base->getSourceRange(), 3797 Context.getTypeDeclType(ClassDecl)); 3798 3799 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3800 DiagnoseUseOfDecl(Dtor, Location); 3801 } 3802 3803 // Virtual bases. 3804 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3805 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3806 3807 // Bases are always records in a well-formed non-dependent class. 3808 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3809 3810 // Ignore direct virtual bases. 3811 if (DirectVirtualBases.count(RT)) 3812 continue; 3813 3814 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3815 // If our base class is invalid, we probably can't get its dtor anyway. 3816 if (BaseClassDecl->isInvalidDecl()) 3817 continue; 3818 if (BaseClassDecl->hasIrrelevantDestructor()) 3819 continue; 3820 3821 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3822 assert(Dtor && "No dtor found for BaseClassDecl!"); 3823 if (CheckDestructorAccess( 3824 ClassDecl->getLocation(), Dtor, 3825 PDiag(diag::err_access_dtor_vbase) 3826 << Context.getTypeDeclType(ClassDecl) << VBase->getType(), 3827 Context.getTypeDeclType(ClassDecl)) == 3828 AR_accessible) { 3829 CheckDerivedToBaseConversion( 3830 Context.getTypeDeclType(ClassDecl), VBase->getType(), 3831 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), 3832 SourceRange(), DeclarationName(), 0); 3833 } 3834 3835 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3836 DiagnoseUseOfDecl(Dtor, Location); 3837 } 3838} 3839 3840void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3841 if (!CDtorDecl) 3842 return; 3843 3844 if (CXXConstructorDecl *Constructor 3845 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3846 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3847} 3848 3849bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3850 unsigned DiagID, AbstractDiagSelID SelID) { 3851 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3852 unsigned DiagID; 3853 AbstractDiagSelID SelID; 3854 3855 public: 3856 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3857 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3858 3859 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3860 if (Suppressed) return; 3861 if (SelID == -1) 3862 S.Diag(Loc, DiagID) << T; 3863 else 3864 S.Diag(Loc, DiagID) << SelID << T; 3865 } 3866 } Diagnoser(DiagID, SelID); 3867 3868 return RequireNonAbstractType(Loc, T, Diagnoser); 3869} 3870 3871bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3872 TypeDiagnoser &Diagnoser) { 3873 if (!getLangOpts().CPlusPlus) 3874 return false; 3875 3876 if (const ArrayType *AT = Context.getAsArrayType(T)) 3877 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3878 3879 if (const PointerType *PT = T->getAs<PointerType>()) { 3880 // Find the innermost pointer type. 3881 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3882 PT = T; 3883 3884 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3885 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3886 } 3887 3888 const RecordType *RT = T->getAs<RecordType>(); 3889 if (!RT) 3890 return false; 3891 3892 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3893 3894 // We can't answer whether something is abstract until it has a 3895 // definition. If it's currently being defined, we'll walk back 3896 // over all the declarations when we have a full definition. 3897 const CXXRecordDecl *Def = RD->getDefinition(); 3898 if (!Def || Def->isBeingDefined()) 3899 return false; 3900 3901 if (!RD->isAbstract()) 3902 return false; 3903 3904 Diagnoser.diagnose(*this, Loc, T); 3905 DiagnoseAbstractType(RD); 3906 3907 return true; 3908} 3909 3910void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3911 // Check if we've already emitted the list of pure virtual functions 3912 // for this class. 3913 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3914 return; 3915 3916 CXXFinalOverriderMap FinalOverriders; 3917 RD->getFinalOverriders(FinalOverriders); 3918 3919 // Keep a set of seen pure methods so we won't diagnose the same method 3920 // more than once. 3921 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3922 3923 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3924 MEnd = FinalOverriders.end(); 3925 M != MEnd; 3926 ++M) { 3927 for (OverridingMethods::iterator SO = M->second.begin(), 3928 SOEnd = M->second.end(); 3929 SO != SOEnd; ++SO) { 3930 // C++ [class.abstract]p4: 3931 // A class is abstract if it contains or inherits at least one 3932 // pure virtual function for which the final overrider is pure 3933 // virtual. 3934 3935 // 3936 if (SO->second.size() != 1) 3937 continue; 3938 3939 if (!SO->second.front().Method->isPure()) 3940 continue; 3941 3942 if (!SeenPureMethods.insert(SO->second.front().Method)) 3943 continue; 3944 3945 Diag(SO->second.front().Method->getLocation(), 3946 diag::note_pure_virtual_function) 3947 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3948 } 3949 } 3950 3951 if (!PureVirtualClassDiagSet) 3952 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3953 PureVirtualClassDiagSet->insert(RD); 3954} 3955 3956namespace { 3957struct AbstractUsageInfo { 3958 Sema &S; 3959 CXXRecordDecl *Record; 3960 CanQualType AbstractType; 3961 bool Invalid; 3962 3963 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3964 : S(S), Record(Record), 3965 AbstractType(S.Context.getCanonicalType( 3966 S.Context.getTypeDeclType(Record))), 3967 Invalid(false) {} 3968 3969 void DiagnoseAbstractType() { 3970 if (Invalid) return; 3971 S.DiagnoseAbstractType(Record); 3972 Invalid = true; 3973 } 3974 3975 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3976}; 3977 3978struct CheckAbstractUsage { 3979 AbstractUsageInfo &Info; 3980 const NamedDecl *Ctx; 3981 3982 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3983 : Info(Info), Ctx(Ctx) {} 3984 3985 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3986 switch (TL.getTypeLocClass()) { 3987#define ABSTRACT_TYPELOC(CLASS, PARENT) 3988#define TYPELOC(CLASS, PARENT) \ 3989 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3990#include "clang/AST/TypeLocNodes.def" 3991 } 3992 } 3993 3994 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3995 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3996 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3997 if (!TL.getArg(I)) 3998 continue; 3999 4000 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 4001 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 4002 } 4003 } 4004 4005 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4006 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 4007 } 4008 4009 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4010 // Visit the type parameters from a permissive context. 4011 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4012 TemplateArgumentLoc TAL = TL.getArgLoc(I); 4013 if (TAL.getArgument().getKind() == TemplateArgument::Type) 4014 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 4015 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 4016 // TODO: other template argument types? 4017 } 4018 } 4019 4020 // Visit pointee types from a permissive context. 4021#define CheckPolymorphic(Type) \ 4022 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 4023 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 4024 } 4025 CheckPolymorphic(PointerTypeLoc) 4026 CheckPolymorphic(ReferenceTypeLoc) 4027 CheckPolymorphic(MemberPointerTypeLoc) 4028 CheckPolymorphic(BlockPointerTypeLoc) 4029 CheckPolymorphic(AtomicTypeLoc) 4030 4031 /// Handle all the types we haven't given a more specific 4032 /// implementation for above. 4033 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4034 // Every other kind of type that we haven't called out already 4035 // that has an inner type is either (1) sugar or (2) contains that 4036 // inner type in some way as a subobject. 4037 if (TypeLoc Next = TL.getNextTypeLoc()) 4038 return Visit(Next, Sel); 4039 4040 // If there's no inner type and we're in a permissive context, 4041 // don't diagnose. 4042 if (Sel == Sema::AbstractNone) return; 4043 4044 // Check whether the type matches the abstract type. 4045 QualType T = TL.getType(); 4046 if (T->isArrayType()) { 4047 Sel = Sema::AbstractArrayType; 4048 T = Info.S.Context.getBaseElementType(T); 4049 } 4050 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4051 if (CT != Info.AbstractType) return; 4052 4053 // It matched; do some magic. 4054 if (Sel == Sema::AbstractArrayType) { 4055 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4056 << T << TL.getSourceRange(); 4057 } else { 4058 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4059 << Sel << T << TL.getSourceRange(); 4060 } 4061 Info.DiagnoseAbstractType(); 4062 } 4063}; 4064 4065void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4066 Sema::AbstractDiagSelID Sel) { 4067 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4068} 4069 4070} 4071 4072/// Check for invalid uses of an abstract type in a method declaration. 4073static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4074 CXXMethodDecl *MD) { 4075 // No need to do the check on definitions, which require that 4076 // the return/param types be complete. 4077 if (MD->doesThisDeclarationHaveABody()) 4078 return; 4079 4080 // For safety's sake, just ignore it if we don't have type source 4081 // information. This should never happen for non-implicit methods, 4082 // but... 4083 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4084 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4085} 4086 4087/// Check for invalid uses of an abstract type within a class definition. 4088static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4089 CXXRecordDecl *RD) { 4090 for (CXXRecordDecl::decl_iterator 4091 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4092 Decl *D = *I; 4093 if (D->isImplicit()) continue; 4094 4095 // Methods and method templates. 4096 if (isa<CXXMethodDecl>(D)) { 4097 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4098 } else if (isa<FunctionTemplateDecl>(D)) { 4099 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4100 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4101 4102 // Fields and static variables. 4103 } else if (isa<FieldDecl>(D)) { 4104 FieldDecl *FD = cast<FieldDecl>(D); 4105 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4106 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4107 } else if (isa<VarDecl>(D)) { 4108 VarDecl *VD = cast<VarDecl>(D); 4109 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4110 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4111 4112 // Nested classes and class templates. 4113 } else if (isa<CXXRecordDecl>(D)) { 4114 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4115 } else if (isa<ClassTemplateDecl>(D)) { 4116 CheckAbstractClassUsage(Info, 4117 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4118 } 4119 } 4120} 4121 4122/// \brief Perform semantic checks on a class definition that has been 4123/// completing, introducing implicitly-declared members, checking for 4124/// abstract types, etc. 4125void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4126 if (!Record) 4127 return; 4128 4129 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4130 AbstractUsageInfo Info(*this, Record); 4131 CheckAbstractClassUsage(Info, Record); 4132 } 4133 4134 // If this is not an aggregate type and has no user-declared constructor, 4135 // complain about any non-static data members of reference or const scalar 4136 // type, since they will never get initializers. 4137 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4138 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4139 !Record->isLambda()) { 4140 bool Complained = false; 4141 for (RecordDecl::field_iterator F = Record->field_begin(), 4142 FEnd = Record->field_end(); 4143 F != FEnd; ++F) { 4144 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4145 continue; 4146 4147 if (F->getType()->isReferenceType() || 4148 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4149 if (!Complained) { 4150 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4151 << Record->getTagKind() << Record; 4152 Complained = true; 4153 } 4154 4155 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4156 << F->getType()->isReferenceType() 4157 << F->getDeclName(); 4158 } 4159 } 4160 } 4161 4162 if (Record->isDynamicClass() && !Record->isDependentType()) 4163 DynamicClasses.push_back(Record); 4164 4165 if (Record->getIdentifier()) { 4166 // C++ [class.mem]p13: 4167 // If T is the name of a class, then each of the following shall have a 4168 // name different from T: 4169 // - every member of every anonymous union that is a member of class T. 4170 // 4171 // C++ [class.mem]p14: 4172 // In addition, if class T has a user-declared constructor (12.1), every 4173 // non-static data member of class T shall have a name different from T. 4174 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4175 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4176 ++I) { 4177 NamedDecl *D = *I; 4178 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4179 isa<IndirectFieldDecl>(D)) { 4180 Diag(D->getLocation(), diag::err_member_name_of_class) 4181 << D->getDeclName(); 4182 break; 4183 } 4184 } 4185 } 4186 4187 // Warn if the class has virtual methods but non-virtual public destructor. 4188 if (Record->isPolymorphic() && !Record->isDependentType()) { 4189 CXXDestructorDecl *dtor = Record->getDestructor(); 4190 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4191 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4192 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4193 } 4194 4195 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4196 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4197 DiagnoseAbstractType(Record); 4198 } 4199 4200 if (!Record->isDependentType()) { 4201 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4202 MEnd = Record->method_end(); 4203 M != MEnd; ++M) { 4204 // See if a method overloads virtual methods in a base 4205 // class without overriding any. 4206 if (!M->isStatic()) 4207 DiagnoseHiddenVirtualMethods(Record, *M); 4208 4209 // Check whether the explicitly-defaulted special members are valid. 4210 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4211 CheckExplicitlyDefaultedSpecialMember(*M); 4212 4213 // For an explicitly defaulted or deleted special member, we defer 4214 // determining triviality until the class is complete. That time is now! 4215 if (!M->isImplicit() && !M->isUserProvided()) { 4216 CXXSpecialMember CSM = getSpecialMember(*M); 4217 if (CSM != CXXInvalid) { 4218 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4219 4220 // Inform the class that we've finished declaring this member. 4221 Record->finishedDefaultedOrDeletedMember(*M); 4222 } 4223 } 4224 } 4225 } 4226 4227 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4228 // function that is not a constructor declares that member function to be 4229 // const. [...] The class of which that function is a member shall be 4230 // a literal type. 4231 // 4232 // If the class has virtual bases, any constexpr members will already have 4233 // been diagnosed by the checks performed on the member declaration, so 4234 // suppress this (less useful) diagnostic. 4235 // 4236 // We delay this until we know whether an explicitly-defaulted (or deleted) 4237 // destructor for the class is trivial. 4238 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4239 !Record->isLiteral() && !Record->getNumVBases()) { 4240 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4241 MEnd = Record->method_end(); 4242 M != MEnd; ++M) { 4243 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4244 switch (Record->getTemplateSpecializationKind()) { 4245 case TSK_ImplicitInstantiation: 4246 case TSK_ExplicitInstantiationDeclaration: 4247 case TSK_ExplicitInstantiationDefinition: 4248 // If a template instantiates to a non-literal type, but its members 4249 // instantiate to constexpr functions, the template is technically 4250 // ill-formed, but we allow it for sanity. 4251 continue; 4252 4253 case TSK_Undeclared: 4254 case TSK_ExplicitSpecialization: 4255 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4256 diag::err_constexpr_method_non_literal); 4257 break; 4258 } 4259 4260 // Only produce one error per class. 4261 break; 4262 } 4263 } 4264 } 4265 4266 // Declare inheriting constructors. We do this eagerly here because: 4267 // - The standard requires an eager diagnostic for conflicting inheriting 4268 // constructors from different classes. 4269 // - The lazy declaration of the other implicit constructors is so as to not 4270 // waste space and performance on classes that are not meant to be 4271 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4272 // have inheriting constructors. 4273 DeclareInheritingConstructors(Record); 4274} 4275 4276/// Is the special member function which would be selected to perform the 4277/// specified operation on the specified class type a constexpr constructor? 4278static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4279 Sema::CXXSpecialMember CSM, 4280 bool ConstArg) { 4281 Sema::SpecialMemberOverloadResult *SMOR = 4282 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4283 false, false, false, false); 4284 if (!SMOR || !SMOR->getMethod()) 4285 // A constructor we wouldn't select can't be "involved in initializing" 4286 // anything. 4287 return true; 4288 return SMOR->getMethod()->isConstexpr(); 4289} 4290 4291/// Determine whether the specified special member function would be constexpr 4292/// if it were implicitly defined. 4293static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4294 Sema::CXXSpecialMember CSM, 4295 bool ConstArg) { 4296 if (!S.getLangOpts().CPlusPlus11) 4297 return false; 4298 4299 // C++11 [dcl.constexpr]p4: 4300 // In the definition of a constexpr constructor [...] 4301 bool Ctor = true; 4302 switch (CSM) { 4303 case Sema::CXXDefaultConstructor: 4304 // Since default constructor lookup is essentially trivial (and cannot 4305 // involve, for instance, template instantiation), we compute whether a 4306 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4307 // 4308 // This is important for performance; we need to know whether the default 4309 // constructor is constexpr to determine whether the type is a literal type. 4310 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4311 4312 case Sema::CXXCopyConstructor: 4313 case Sema::CXXMoveConstructor: 4314 // For copy or move constructors, we need to perform overload resolution. 4315 break; 4316 4317 case Sema::CXXCopyAssignment: 4318 case Sema::CXXMoveAssignment: 4319 if (!S.getLangOpts().CPlusPlus1y) 4320 return false; 4321 // In C++1y, we need to perform overload resolution. 4322 Ctor = false; 4323 break; 4324 4325 case Sema::CXXDestructor: 4326 case Sema::CXXInvalid: 4327 return false; 4328 } 4329 4330 // -- if the class is a non-empty union, or for each non-empty anonymous 4331 // union member of a non-union class, exactly one non-static data member 4332 // shall be initialized; [DR1359] 4333 // 4334 // If we squint, this is guaranteed, since exactly one non-static data member 4335 // will be initialized (if the constructor isn't deleted), we just don't know 4336 // which one. 4337 if (Ctor && ClassDecl->isUnion()) 4338 return true; 4339 4340 // -- the class shall not have any virtual base classes; 4341 if (Ctor && ClassDecl->getNumVBases()) 4342 return false; 4343 4344 // C++1y [class.copy]p26: 4345 // -- [the class] is a literal type, and 4346 if (!Ctor && !ClassDecl->isLiteral()) 4347 return false; 4348 4349 // -- every constructor involved in initializing [...] base class 4350 // sub-objects shall be a constexpr constructor; 4351 // -- the assignment operator selected to copy/move each direct base 4352 // class is a constexpr function, and 4353 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4354 BEnd = ClassDecl->bases_end(); 4355 B != BEnd; ++B) { 4356 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4357 if (!BaseType) continue; 4358 4359 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4360 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4361 return false; 4362 } 4363 4364 // -- every constructor involved in initializing non-static data members 4365 // [...] shall be a constexpr constructor; 4366 // -- every non-static data member and base class sub-object shall be 4367 // initialized 4368 // -- for each non-stastic data member of X that is of class type (or array 4369 // thereof), the assignment operator selected to copy/move that member is 4370 // a constexpr function 4371 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4372 FEnd = ClassDecl->field_end(); 4373 F != FEnd; ++F) { 4374 if (F->isInvalidDecl()) 4375 continue; 4376 if (const RecordType *RecordTy = 4377 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4378 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4379 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4380 return false; 4381 } 4382 } 4383 4384 // All OK, it's constexpr! 4385 return true; 4386} 4387 4388static Sema::ImplicitExceptionSpecification 4389computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4390 switch (S.getSpecialMember(MD)) { 4391 case Sema::CXXDefaultConstructor: 4392 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4393 case Sema::CXXCopyConstructor: 4394 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4395 case Sema::CXXCopyAssignment: 4396 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4397 case Sema::CXXMoveConstructor: 4398 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4399 case Sema::CXXMoveAssignment: 4400 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4401 case Sema::CXXDestructor: 4402 return S.ComputeDefaultedDtorExceptionSpec(MD); 4403 case Sema::CXXInvalid: 4404 break; 4405 } 4406 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4407 "only special members have implicit exception specs"); 4408 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4409} 4410 4411static void 4412updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4413 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4414 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4415 ExceptSpec.getEPI(EPI); 4416 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4417 FPT->getArgTypes(), EPI)); 4418} 4419 4420void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4421 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4422 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4423 return; 4424 4425 // Evaluate the exception specification. 4426 ImplicitExceptionSpecification ExceptSpec = 4427 computeImplicitExceptionSpec(*this, Loc, MD); 4428 4429 // Update the type of the special member to use it. 4430 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4431 4432 // A user-provided destructor can be defined outside the class. When that 4433 // happens, be sure to update the exception specification on both 4434 // declarations. 4435 const FunctionProtoType *CanonicalFPT = 4436 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4437 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4438 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4439 CanonicalFPT, ExceptSpec); 4440} 4441 4442void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4443 CXXRecordDecl *RD = MD->getParent(); 4444 CXXSpecialMember CSM = getSpecialMember(MD); 4445 4446 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4447 "not an explicitly-defaulted special member"); 4448 4449 // Whether this was the first-declared instance of the constructor. 4450 // This affects whether we implicitly add an exception spec and constexpr. 4451 bool First = MD == MD->getCanonicalDecl(); 4452 4453 bool HadError = false; 4454 4455 // C++11 [dcl.fct.def.default]p1: 4456 // A function that is explicitly defaulted shall 4457 // -- be a special member function (checked elsewhere), 4458 // -- have the same type (except for ref-qualifiers, and except that a 4459 // copy operation can take a non-const reference) as an implicit 4460 // declaration, and 4461 // -- not have default arguments. 4462 unsigned ExpectedParams = 1; 4463 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4464 ExpectedParams = 0; 4465 if (MD->getNumParams() != ExpectedParams) { 4466 // This also checks for default arguments: a copy or move constructor with a 4467 // default argument is classified as a default constructor, and assignment 4468 // operations and destructors can't have default arguments. 4469 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4470 << CSM << MD->getSourceRange(); 4471 HadError = true; 4472 } else if (MD->isVariadic()) { 4473 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4474 << CSM << MD->getSourceRange(); 4475 HadError = true; 4476 } 4477 4478 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4479 4480 bool CanHaveConstParam = false; 4481 if (CSM == CXXCopyConstructor) 4482 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4483 else if (CSM == CXXCopyAssignment) 4484 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4485 4486 QualType ReturnType = Context.VoidTy; 4487 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4488 // Check for return type matching. 4489 ReturnType = Type->getResultType(); 4490 QualType ExpectedReturnType = 4491 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4492 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4493 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4494 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4495 HadError = true; 4496 } 4497 4498 // A defaulted special member cannot have cv-qualifiers. 4499 if (Type->getTypeQuals()) { 4500 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4501 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4502 HadError = true; 4503 } 4504 } 4505 4506 // Check for parameter type matching. 4507 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4508 bool HasConstParam = false; 4509 if (ExpectedParams && ArgType->isReferenceType()) { 4510 // Argument must be reference to possibly-const T. 4511 QualType ReferentType = ArgType->getPointeeType(); 4512 HasConstParam = ReferentType.isConstQualified(); 4513 4514 if (ReferentType.isVolatileQualified()) { 4515 Diag(MD->getLocation(), 4516 diag::err_defaulted_special_member_volatile_param) << CSM; 4517 HadError = true; 4518 } 4519 4520 if (HasConstParam && !CanHaveConstParam) { 4521 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4522 Diag(MD->getLocation(), 4523 diag::err_defaulted_special_member_copy_const_param) 4524 << (CSM == CXXCopyAssignment); 4525 // FIXME: Explain why this special member can't be const. 4526 } else { 4527 Diag(MD->getLocation(), 4528 diag::err_defaulted_special_member_move_const_param) 4529 << (CSM == CXXMoveAssignment); 4530 } 4531 HadError = true; 4532 } 4533 } else if (ExpectedParams) { 4534 // A copy assignment operator can take its argument by value, but a 4535 // defaulted one cannot. 4536 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4537 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4538 HadError = true; 4539 } 4540 4541 // C++11 [dcl.fct.def.default]p2: 4542 // An explicitly-defaulted function may be declared constexpr only if it 4543 // would have been implicitly declared as constexpr, 4544 // Do not apply this rule to members of class templates, since core issue 1358 4545 // makes such functions always instantiate to constexpr functions. For 4546 // functions which cannot be constexpr (for non-constructors in C++11 and for 4547 // destructors in C++1y), this is checked elsewhere. 4548 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4549 HasConstParam); 4550 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4551 : isa<CXXConstructorDecl>(MD)) && 4552 MD->isConstexpr() && !Constexpr && 4553 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4554 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4555 // FIXME: Explain why the special member can't be constexpr. 4556 HadError = true; 4557 } 4558 4559 // and may have an explicit exception-specification only if it is compatible 4560 // with the exception-specification on the implicit declaration. 4561 if (Type->hasExceptionSpec()) { 4562 // Delay the check if this is the first declaration of the special member, 4563 // since we may not have parsed some necessary in-class initializers yet. 4564 if (First) { 4565 // If the exception specification needs to be instantiated, do so now, 4566 // before we clobber it with an EST_Unevaluated specification below. 4567 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4568 InstantiateExceptionSpec(MD->getLocStart(), MD); 4569 Type = MD->getType()->getAs<FunctionProtoType>(); 4570 } 4571 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4572 } else 4573 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4574 } 4575 4576 // If a function is explicitly defaulted on its first declaration, 4577 if (First) { 4578 // -- it is implicitly considered to be constexpr if the implicit 4579 // definition would be, 4580 MD->setConstexpr(Constexpr); 4581 4582 // -- it is implicitly considered to have the same exception-specification 4583 // as if it had been implicitly declared, 4584 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4585 EPI.ExceptionSpecType = EST_Unevaluated; 4586 EPI.ExceptionSpecDecl = MD; 4587 MD->setType(Context.getFunctionType(ReturnType, 4588 ArrayRef<QualType>(&ArgType, 4589 ExpectedParams), 4590 EPI)); 4591 } 4592 4593 if (ShouldDeleteSpecialMember(MD, CSM)) { 4594 if (First) { 4595 SetDeclDeleted(MD, MD->getLocation()); 4596 } else { 4597 // C++11 [dcl.fct.def.default]p4: 4598 // [For a] user-provided explicitly-defaulted function [...] if such a 4599 // function is implicitly defined as deleted, the program is ill-formed. 4600 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4601 HadError = true; 4602 } 4603 } 4604 4605 if (HadError) 4606 MD->setInvalidDecl(); 4607} 4608 4609/// Check whether the exception specification provided for an 4610/// explicitly-defaulted special member matches the exception specification 4611/// that would have been generated for an implicit special member, per 4612/// C++11 [dcl.fct.def.default]p2. 4613void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4614 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4615 // Compute the implicit exception specification. 4616 FunctionProtoType::ExtProtoInfo EPI; 4617 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4618 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4619 Context.getFunctionType(Context.VoidTy, None, EPI)); 4620 4621 // Ensure that it matches. 4622 CheckEquivalentExceptionSpec( 4623 PDiag(diag::err_incorrect_defaulted_exception_spec) 4624 << getSpecialMember(MD), PDiag(), 4625 ImplicitType, SourceLocation(), 4626 SpecifiedType, MD->getLocation()); 4627} 4628 4629void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4630 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4631 I != N; ++I) 4632 CheckExplicitlyDefaultedMemberExceptionSpec( 4633 DelayedDefaultedMemberExceptionSpecs[I].first, 4634 DelayedDefaultedMemberExceptionSpecs[I].second); 4635 4636 DelayedDefaultedMemberExceptionSpecs.clear(); 4637} 4638 4639namespace { 4640struct SpecialMemberDeletionInfo { 4641 Sema &S; 4642 CXXMethodDecl *MD; 4643 Sema::CXXSpecialMember CSM; 4644 bool Diagnose; 4645 4646 // Properties of the special member, computed for convenience. 4647 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4648 SourceLocation Loc; 4649 4650 bool AllFieldsAreConst; 4651 4652 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4653 Sema::CXXSpecialMember CSM, bool Diagnose) 4654 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4655 IsConstructor(false), IsAssignment(false), IsMove(false), 4656 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4657 AllFieldsAreConst(true) { 4658 switch (CSM) { 4659 case Sema::CXXDefaultConstructor: 4660 case Sema::CXXCopyConstructor: 4661 IsConstructor = true; 4662 break; 4663 case Sema::CXXMoveConstructor: 4664 IsConstructor = true; 4665 IsMove = true; 4666 break; 4667 case Sema::CXXCopyAssignment: 4668 IsAssignment = true; 4669 break; 4670 case Sema::CXXMoveAssignment: 4671 IsAssignment = true; 4672 IsMove = true; 4673 break; 4674 case Sema::CXXDestructor: 4675 break; 4676 case Sema::CXXInvalid: 4677 llvm_unreachable("invalid special member kind"); 4678 } 4679 4680 if (MD->getNumParams()) { 4681 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4682 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4683 } 4684 } 4685 4686 bool inUnion() const { return MD->getParent()->isUnion(); } 4687 4688 /// Look up the corresponding special member in the given class. 4689 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4690 unsigned Quals) { 4691 unsigned TQ = MD->getTypeQualifiers(); 4692 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4693 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4694 Quals = 0; 4695 return S.LookupSpecialMember(Class, CSM, 4696 ConstArg || (Quals & Qualifiers::Const), 4697 VolatileArg || (Quals & Qualifiers::Volatile), 4698 MD->getRefQualifier() == RQ_RValue, 4699 TQ & Qualifiers::Const, 4700 TQ & Qualifiers::Volatile); 4701 } 4702 4703 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4704 4705 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4706 bool shouldDeleteForField(FieldDecl *FD); 4707 bool shouldDeleteForAllConstMembers(); 4708 4709 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4710 unsigned Quals); 4711 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4712 Sema::SpecialMemberOverloadResult *SMOR, 4713 bool IsDtorCallInCtor); 4714 4715 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4716}; 4717} 4718 4719/// Is the given special member inaccessible when used on the given 4720/// sub-object. 4721bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4722 CXXMethodDecl *target) { 4723 /// If we're operating on a base class, the object type is the 4724 /// type of this special member. 4725 QualType objectTy; 4726 AccessSpecifier access = target->getAccess(); 4727 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4728 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4729 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4730 4731 // If we're operating on a field, the object type is the type of the field. 4732 } else { 4733 objectTy = S.Context.getTypeDeclType(target->getParent()); 4734 } 4735 4736 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4737} 4738 4739/// Check whether we should delete a special member due to the implicit 4740/// definition containing a call to a special member of a subobject. 4741bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4742 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4743 bool IsDtorCallInCtor) { 4744 CXXMethodDecl *Decl = SMOR->getMethod(); 4745 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4746 4747 int DiagKind = -1; 4748 4749 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4750 DiagKind = !Decl ? 0 : 1; 4751 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4752 DiagKind = 2; 4753 else if (!isAccessible(Subobj, Decl)) 4754 DiagKind = 3; 4755 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4756 !Decl->isTrivial()) { 4757 // A member of a union must have a trivial corresponding special member. 4758 // As a weird special case, a destructor call from a union's constructor 4759 // must be accessible and non-deleted, but need not be trivial. Such a 4760 // destructor is never actually called, but is semantically checked as 4761 // if it were. 4762 DiagKind = 4; 4763 } 4764 4765 if (DiagKind == -1) 4766 return false; 4767 4768 if (Diagnose) { 4769 if (Field) { 4770 S.Diag(Field->getLocation(), 4771 diag::note_deleted_special_member_class_subobject) 4772 << CSM << MD->getParent() << /*IsField*/true 4773 << Field << DiagKind << IsDtorCallInCtor; 4774 } else { 4775 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4776 S.Diag(Base->getLocStart(), 4777 diag::note_deleted_special_member_class_subobject) 4778 << CSM << MD->getParent() << /*IsField*/false 4779 << Base->getType() << DiagKind << IsDtorCallInCtor; 4780 } 4781 4782 if (DiagKind == 1) 4783 S.NoteDeletedFunction(Decl); 4784 // FIXME: Explain inaccessibility if DiagKind == 3. 4785 } 4786 4787 return true; 4788} 4789 4790/// Check whether we should delete a special member function due to having a 4791/// direct or virtual base class or non-static data member of class type M. 4792bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4793 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4794 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4795 4796 // C++11 [class.ctor]p5: 4797 // -- any direct or virtual base class, or non-static data member with no 4798 // brace-or-equal-initializer, has class type M (or array thereof) and 4799 // either M has no default constructor or overload resolution as applied 4800 // to M's default constructor results in an ambiguity or in a function 4801 // that is deleted or inaccessible 4802 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4803 // -- a direct or virtual base class B that cannot be copied/moved because 4804 // overload resolution, as applied to B's corresponding special member, 4805 // results in an ambiguity or a function that is deleted or inaccessible 4806 // from the defaulted special member 4807 // C++11 [class.dtor]p5: 4808 // -- any direct or virtual base class [...] has a type with a destructor 4809 // that is deleted or inaccessible 4810 if (!(CSM == Sema::CXXDefaultConstructor && 4811 Field && Field->hasInClassInitializer()) && 4812 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4813 return true; 4814 4815 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4816 // -- any direct or virtual base class or non-static data member has a 4817 // type with a destructor that is deleted or inaccessible 4818 if (IsConstructor) { 4819 Sema::SpecialMemberOverloadResult *SMOR = 4820 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4821 false, false, false, false, false); 4822 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4823 return true; 4824 } 4825 4826 return false; 4827} 4828 4829/// Check whether we should delete a special member function due to the class 4830/// having a particular direct or virtual base class. 4831bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4832 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4833 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4834} 4835 4836/// Check whether we should delete a special member function due to the class 4837/// having a particular non-static data member. 4838bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4839 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4840 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4841 4842 if (CSM == Sema::CXXDefaultConstructor) { 4843 // For a default constructor, all references must be initialized in-class 4844 // and, if a union, it must have a non-const member. 4845 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4846 if (Diagnose) 4847 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4848 << MD->getParent() << FD << FieldType << /*Reference*/0; 4849 return true; 4850 } 4851 // C++11 [class.ctor]p5: any non-variant non-static data member of 4852 // const-qualified type (or array thereof) with no 4853 // brace-or-equal-initializer does not have a user-provided default 4854 // constructor. 4855 if (!inUnion() && FieldType.isConstQualified() && 4856 !FD->hasInClassInitializer() && 4857 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4858 if (Diagnose) 4859 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4860 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4861 return true; 4862 } 4863 4864 if (inUnion() && !FieldType.isConstQualified()) 4865 AllFieldsAreConst = false; 4866 } else if (CSM == Sema::CXXCopyConstructor) { 4867 // For a copy constructor, data members must not be of rvalue reference 4868 // type. 4869 if (FieldType->isRValueReferenceType()) { 4870 if (Diagnose) 4871 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4872 << MD->getParent() << FD << FieldType; 4873 return true; 4874 } 4875 } else if (IsAssignment) { 4876 // For an assignment operator, data members must not be of reference type. 4877 if (FieldType->isReferenceType()) { 4878 if (Diagnose) 4879 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4880 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4881 return true; 4882 } 4883 if (!FieldRecord && FieldType.isConstQualified()) { 4884 // C++11 [class.copy]p23: 4885 // -- a non-static data member of const non-class type (or array thereof) 4886 if (Diagnose) 4887 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4888 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4889 return true; 4890 } 4891 } 4892 4893 if (FieldRecord) { 4894 // Some additional restrictions exist on the variant members. 4895 if (!inUnion() && FieldRecord->isUnion() && 4896 FieldRecord->isAnonymousStructOrUnion()) { 4897 bool AllVariantFieldsAreConst = true; 4898 4899 // FIXME: Handle anonymous unions declared within anonymous unions. 4900 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4901 UE = FieldRecord->field_end(); 4902 UI != UE; ++UI) { 4903 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4904 4905 if (!UnionFieldType.isConstQualified()) 4906 AllVariantFieldsAreConst = false; 4907 4908 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4909 if (UnionFieldRecord && 4910 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4911 UnionFieldType.getCVRQualifiers())) 4912 return true; 4913 } 4914 4915 // At least one member in each anonymous union must be non-const 4916 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4917 FieldRecord->field_begin() != FieldRecord->field_end()) { 4918 if (Diagnose) 4919 S.Diag(FieldRecord->getLocation(), 4920 diag::note_deleted_default_ctor_all_const) 4921 << MD->getParent() << /*anonymous union*/1; 4922 return true; 4923 } 4924 4925 // Don't check the implicit member of the anonymous union type. 4926 // This is technically non-conformant, but sanity demands it. 4927 return false; 4928 } 4929 4930 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4931 FieldType.getCVRQualifiers())) 4932 return true; 4933 } 4934 4935 return false; 4936} 4937 4938/// C++11 [class.ctor] p5: 4939/// A defaulted default constructor for a class X is defined as deleted if 4940/// X is a union and all of its variant members are of const-qualified type. 4941bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4942 // This is a silly definition, because it gives an empty union a deleted 4943 // default constructor. Don't do that. 4944 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4945 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4946 if (Diagnose) 4947 S.Diag(MD->getParent()->getLocation(), 4948 diag::note_deleted_default_ctor_all_const) 4949 << MD->getParent() << /*not anonymous union*/0; 4950 return true; 4951 } 4952 return false; 4953} 4954 4955/// Determine whether a defaulted special member function should be defined as 4956/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4957/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4958bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4959 bool Diagnose) { 4960 if (MD->isInvalidDecl()) 4961 return false; 4962 CXXRecordDecl *RD = MD->getParent(); 4963 assert(!RD->isDependentType() && "do deletion after instantiation"); 4964 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4965 return false; 4966 4967 // C++11 [expr.lambda.prim]p19: 4968 // The closure type associated with a lambda-expression has a 4969 // deleted (8.4.3) default constructor and a deleted copy 4970 // assignment operator. 4971 if (RD->isLambda() && 4972 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4973 if (Diagnose) 4974 Diag(RD->getLocation(), diag::note_lambda_decl); 4975 return true; 4976 } 4977 4978 // For an anonymous struct or union, the copy and assignment special members 4979 // will never be used, so skip the check. For an anonymous union declared at 4980 // namespace scope, the constructor and destructor are used. 4981 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4982 RD->isAnonymousStructOrUnion()) 4983 return false; 4984 4985 // C++11 [class.copy]p7, p18: 4986 // If the class definition declares a move constructor or move assignment 4987 // operator, an implicitly declared copy constructor or copy assignment 4988 // operator is defined as deleted. 4989 if (MD->isImplicit() && 4990 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4991 CXXMethodDecl *UserDeclaredMove = 0; 4992 4993 // In Microsoft mode, a user-declared move only causes the deletion of the 4994 // corresponding copy operation, not both copy operations. 4995 if (RD->hasUserDeclaredMoveConstructor() && 4996 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4997 if (!Diagnose) return true; 4998 4999 // Find any user-declared move constructor. 5000 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 5001 E = RD->ctor_end(); I != E; ++I) { 5002 if (I->isMoveConstructor()) { 5003 UserDeclaredMove = *I; 5004 break; 5005 } 5006 } 5007 assert(UserDeclaredMove); 5008 } else if (RD->hasUserDeclaredMoveAssignment() && 5009 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 5010 if (!Diagnose) return true; 5011 5012 // Find any user-declared move assignment operator. 5013 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 5014 E = RD->method_end(); I != E; ++I) { 5015 if (I->isMoveAssignmentOperator()) { 5016 UserDeclaredMove = *I; 5017 break; 5018 } 5019 } 5020 assert(UserDeclaredMove); 5021 } 5022 5023 if (UserDeclaredMove) { 5024 Diag(UserDeclaredMove->getLocation(), 5025 diag::note_deleted_copy_user_declared_move) 5026 << (CSM == CXXCopyAssignment) << RD 5027 << UserDeclaredMove->isMoveAssignmentOperator(); 5028 return true; 5029 } 5030 } 5031 5032 // Do access control from the special member function 5033 ContextRAII MethodContext(*this, MD); 5034 5035 // C++11 [class.dtor]p5: 5036 // -- for a virtual destructor, lookup of the non-array deallocation function 5037 // results in an ambiguity or in a function that is deleted or inaccessible 5038 if (CSM == CXXDestructor && MD->isVirtual()) { 5039 FunctionDecl *OperatorDelete = 0; 5040 DeclarationName Name = 5041 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5042 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5043 OperatorDelete, false)) { 5044 if (Diagnose) 5045 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5046 return true; 5047 } 5048 } 5049 5050 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5051 5052 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5053 BE = RD->bases_end(); BI != BE; ++BI) 5054 if (!BI->isVirtual() && 5055 SMI.shouldDeleteForBase(BI)) 5056 return true; 5057 5058 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5059 BE = RD->vbases_end(); BI != BE; ++BI) 5060 if (SMI.shouldDeleteForBase(BI)) 5061 return true; 5062 5063 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5064 FE = RD->field_end(); FI != FE; ++FI) 5065 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5066 SMI.shouldDeleteForField(*FI)) 5067 return true; 5068 5069 if (SMI.shouldDeleteForAllConstMembers()) 5070 return true; 5071 5072 return false; 5073} 5074 5075/// Perform lookup for a special member of the specified kind, and determine 5076/// whether it is trivial. If the triviality can be determined without the 5077/// lookup, skip it. This is intended for use when determining whether a 5078/// special member of a containing object is trivial, and thus does not ever 5079/// perform overload resolution for default constructors. 5080/// 5081/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5082/// member that was most likely to be intended to be trivial, if any. 5083static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5084 Sema::CXXSpecialMember CSM, unsigned Quals, 5085 CXXMethodDecl **Selected) { 5086 if (Selected) 5087 *Selected = 0; 5088 5089 switch (CSM) { 5090 case Sema::CXXInvalid: 5091 llvm_unreachable("not a special member"); 5092 5093 case Sema::CXXDefaultConstructor: 5094 // C++11 [class.ctor]p5: 5095 // A default constructor is trivial if: 5096 // - all the [direct subobjects] have trivial default constructors 5097 // 5098 // Note, no overload resolution is performed in this case. 5099 if (RD->hasTrivialDefaultConstructor()) 5100 return true; 5101 5102 if (Selected) { 5103 // If there's a default constructor which could have been trivial, dig it 5104 // out. Otherwise, if there's any user-provided default constructor, point 5105 // to that as an example of why there's not a trivial one. 5106 CXXConstructorDecl *DefCtor = 0; 5107 if (RD->needsImplicitDefaultConstructor()) 5108 S.DeclareImplicitDefaultConstructor(RD); 5109 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5110 CE = RD->ctor_end(); CI != CE; ++CI) { 5111 if (!CI->isDefaultConstructor()) 5112 continue; 5113 DefCtor = *CI; 5114 if (!DefCtor->isUserProvided()) 5115 break; 5116 } 5117 5118 *Selected = DefCtor; 5119 } 5120 5121 return false; 5122 5123 case Sema::CXXDestructor: 5124 // C++11 [class.dtor]p5: 5125 // A destructor is trivial if: 5126 // - all the direct [subobjects] have trivial destructors 5127 if (RD->hasTrivialDestructor()) 5128 return true; 5129 5130 if (Selected) { 5131 if (RD->needsImplicitDestructor()) 5132 S.DeclareImplicitDestructor(RD); 5133 *Selected = RD->getDestructor(); 5134 } 5135 5136 return false; 5137 5138 case Sema::CXXCopyConstructor: 5139 // C++11 [class.copy]p12: 5140 // A copy constructor is trivial if: 5141 // - the constructor selected to copy each direct [subobject] is trivial 5142 if (RD->hasTrivialCopyConstructor()) { 5143 if (Quals == Qualifiers::Const) 5144 // We must either select the trivial copy constructor or reach an 5145 // ambiguity; no need to actually perform overload resolution. 5146 return true; 5147 } else if (!Selected) { 5148 return false; 5149 } 5150 // In C++98, we are not supposed to perform overload resolution here, but we 5151 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5152 // cases like B as having a non-trivial copy constructor: 5153 // struct A { template<typename T> A(T&); }; 5154 // struct B { mutable A a; }; 5155 goto NeedOverloadResolution; 5156 5157 case Sema::CXXCopyAssignment: 5158 // C++11 [class.copy]p25: 5159 // A copy assignment operator is trivial if: 5160 // - the assignment operator selected to copy each direct [subobject] is 5161 // trivial 5162 if (RD->hasTrivialCopyAssignment()) { 5163 if (Quals == Qualifiers::Const) 5164 return true; 5165 } else if (!Selected) { 5166 return false; 5167 } 5168 // In C++98, we are not supposed to perform overload resolution here, but we 5169 // treat that as a language defect. 5170 goto NeedOverloadResolution; 5171 5172 case Sema::CXXMoveConstructor: 5173 case Sema::CXXMoveAssignment: 5174 NeedOverloadResolution: 5175 Sema::SpecialMemberOverloadResult *SMOR = 5176 S.LookupSpecialMember(RD, CSM, 5177 Quals & Qualifiers::Const, 5178 Quals & Qualifiers::Volatile, 5179 /*RValueThis*/false, /*ConstThis*/false, 5180 /*VolatileThis*/false); 5181 5182 // The standard doesn't describe how to behave if the lookup is ambiguous. 5183 // We treat it as not making the member non-trivial, just like the standard 5184 // mandates for the default constructor. This should rarely matter, because 5185 // the member will also be deleted. 5186 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5187 return true; 5188 5189 if (!SMOR->getMethod()) { 5190 assert(SMOR->getKind() == 5191 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5192 return false; 5193 } 5194 5195 // We deliberately don't check if we found a deleted special member. We're 5196 // not supposed to! 5197 if (Selected) 5198 *Selected = SMOR->getMethod(); 5199 return SMOR->getMethod()->isTrivial(); 5200 } 5201 5202 llvm_unreachable("unknown special method kind"); 5203} 5204 5205static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5206 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5207 CI != CE; ++CI) 5208 if (!CI->isImplicit()) 5209 return *CI; 5210 5211 // Look for constructor templates. 5212 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5213 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5214 if (CXXConstructorDecl *CD = 5215 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5216 return CD; 5217 } 5218 5219 return 0; 5220} 5221 5222/// The kind of subobject we are checking for triviality. The values of this 5223/// enumeration are used in diagnostics. 5224enum TrivialSubobjectKind { 5225 /// The subobject is a base class. 5226 TSK_BaseClass, 5227 /// The subobject is a non-static data member. 5228 TSK_Field, 5229 /// The object is actually the complete object. 5230 TSK_CompleteObject 5231}; 5232 5233/// Check whether the special member selected for a given type would be trivial. 5234static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5235 QualType SubType, 5236 Sema::CXXSpecialMember CSM, 5237 TrivialSubobjectKind Kind, 5238 bool Diagnose) { 5239 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5240 if (!SubRD) 5241 return true; 5242 5243 CXXMethodDecl *Selected; 5244 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5245 Diagnose ? &Selected : 0)) 5246 return true; 5247 5248 if (Diagnose) { 5249 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5250 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5251 << Kind << SubType.getUnqualifiedType(); 5252 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5253 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5254 } else if (!Selected) 5255 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5256 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5257 else if (Selected->isUserProvided()) { 5258 if (Kind == TSK_CompleteObject) 5259 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5260 << Kind << SubType.getUnqualifiedType() << CSM; 5261 else { 5262 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5263 << Kind << SubType.getUnqualifiedType() << CSM; 5264 S.Diag(Selected->getLocation(), diag::note_declared_at); 5265 } 5266 } else { 5267 if (Kind != TSK_CompleteObject) 5268 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5269 << Kind << SubType.getUnqualifiedType() << CSM; 5270 5271 // Explain why the defaulted or deleted special member isn't trivial. 5272 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5273 } 5274 } 5275 5276 return false; 5277} 5278 5279/// Check whether the members of a class type allow a special member to be 5280/// trivial. 5281static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5282 Sema::CXXSpecialMember CSM, 5283 bool ConstArg, bool Diagnose) { 5284 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5285 FE = RD->field_end(); FI != FE; ++FI) { 5286 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5287 continue; 5288 5289 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5290 5291 // Pretend anonymous struct or union members are members of this class. 5292 if (FI->isAnonymousStructOrUnion()) { 5293 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5294 CSM, ConstArg, Diagnose)) 5295 return false; 5296 continue; 5297 } 5298 5299 // C++11 [class.ctor]p5: 5300 // A default constructor is trivial if [...] 5301 // -- no non-static data member of its class has a 5302 // brace-or-equal-initializer 5303 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5304 if (Diagnose) 5305 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5306 return false; 5307 } 5308 5309 // Objective C ARC 4.3.5: 5310 // [...] nontrivally ownership-qualified types are [...] not trivially 5311 // default constructible, copy constructible, move constructible, copy 5312 // assignable, move assignable, or destructible [...] 5313 if (S.getLangOpts().ObjCAutoRefCount && 5314 FieldType.hasNonTrivialObjCLifetime()) { 5315 if (Diagnose) 5316 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5317 << RD << FieldType.getObjCLifetime(); 5318 return false; 5319 } 5320 5321 if (ConstArg && !FI->isMutable()) 5322 FieldType.addConst(); 5323 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5324 TSK_Field, Diagnose)) 5325 return false; 5326 } 5327 5328 return true; 5329} 5330 5331/// Diagnose why the specified class does not have a trivial special member of 5332/// the given kind. 5333void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5334 QualType Ty = Context.getRecordType(RD); 5335 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5336 Ty.addConst(); 5337 5338 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5339 TSK_CompleteObject, /*Diagnose*/true); 5340} 5341 5342/// Determine whether a defaulted or deleted special member function is trivial, 5343/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5344/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5345bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5346 bool Diagnose) { 5347 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5348 5349 CXXRecordDecl *RD = MD->getParent(); 5350 5351 bool ConstArg = false; 5352 5353 // C++11 [class.copy]p12, p25: 5354 // A [special member] is trivial if its declared parameter type is the same 5355 // as if it had been implicitly declared [...] 5356 switch (CSM) { 5357 case CXXDefaultConstructor: 5358 case CXXDestructor: 5359 // Trivial default constructors and destructors cannot have parameters. 5360 break; 5361 5362 case CXXCopyConstructor: 5363 case CXXCopyAssignment: { 5364 // Trivial copy operations always have const, non-volatile parameter types. 5365 ConstArg = true; 5366 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5367 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5368 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5369 if (Diagnose) 5370 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5371 << Param0->getSourceRange() << Param0->getType() 5372 << Context.getLValueReferenceType( 5373 Context.getRecordType(RD).withConst()); 5374 return false; 5375 } 5376 break; 5377 } 5378 5379 case CXXMoveConstructor: 5380 case CXXMoveAssignment: { 5381 // Trivial move operations always have non-cv-qualified parameters. 5382 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5383 const RValueReferenceType *RT = 5384 Param0->getType()->getAs<RValueReferenceType>(); 5385 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5386 if (Diagnose) 5387 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5388 << Param0->getSourceRange() << Param0->getType() 5389 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5390 return false; 5391 } 5392 break; 5393 } 5394 5395 case CXXInvalid: 5396 llvm_unreachable("not a special member"); 5397 } 5398 5399 // FIXME: We require that the parameter-declaration-clause is equivalent to 5400 // that of an implicit declaration, not just that the declared parameter type 5401 // matches, in order to prevent absuridities like a function simultaneously 5402 // being a trivial copy constructor and a non-trivial default constructor. 5403 // This issue has not yet been assigned a core issue number. 5404 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5405 if (Diagnose) 5406 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5407 diag::note_nontrivial_default_arg) 5408 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5409 return false; 5410 } 5411 if (MD->isVariadic()) { 5412 if (Diagnose) 5413 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5414 return false; 5415 } 5416 5417 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5418 // A copy/move [constructor or assignment operator] is trivial if 5419 // -- the [member] selected to copy/move each direct base class subobject 5420 // is trivial 5421 // 5422 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5423 // A [default constructor or destructor] is trivial if 5424 // -- all the direct base classes have trivial [default constructors or 5425 // destructors] 5426 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5427 BE = RD->bases_end(); BI != BE; ++BI) 5428 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5429 ConstArg ? BI->getType().withConst() 5430 : BI->getType(), 5431 CSM, TSK_BaseClass, Diagnose)) 5432 return false; 5433 5434 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5435 // A copy/move [constructor or assignment operator] for a class X is 5436 // trivial if 5437 // -- for each non-static data member of X that is of class type (or array 5438 // thereof), the constructor selected to copy/move that member is 5439 // trivial 5440 // 5441 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5442 // A [default constructor or destructor] is trivial if 5443 // -- for all of the non-static data members of its class that are of class 5444 // type (or array thereof), each such class has a trivial [default 5445 // constructor or destructor] 5446 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5447 return false; 5448 5449 // C++11 [class.dtor]p5: 5450 // A destructor is trivial if [...] 5451 // -- the destructor is not virtual 5452 if (CSM == CXXDestructor && MD->isVirtual()) { 5453 if (Diagnose) 5454 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5455 return false; 5456 } 5457 5458 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5459 // A [special member] for class X is trivial if [...] 5460 // -- class X has no virtual functions and no virtual base classes 5461 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5462 if (!Diagnose) 5463 return false; 5464 5465 if (RD->getNumVBases()) { 5466 // Check for virtual bases. We already know that the corresponding 5467 // member in all bases is trivial, so vbases must all be direct. 5468 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5469 assert(BS.isVirtual()); 5470 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5471 return false; 5472 } 5473 5474 // Must have a virtual method. 5475 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5476 ME = RD->method_end(); MI != ME; ++MI) { 5477 if (MI->isVirtual()) { 5478 SourceLocation MLoc = MI->getLocStart(); 5479 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5480 return false; 5481 } 5482 } 5483 5484 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5485 } 5486 5487 // Looks like it's trivial! 5488 return true; 5489} 5490 5491/// \brief Data used with FindHiddenVirtualMethod 5492namespace { 5493 struct FindHiddenVirtualMethodData { 5494 Sema *S; 5495 CXXMethodDecl *Method; 5496 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5497 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5498 }; 5499} 5500 5501/// \brief Check whether any most overriden method from MD in Methods 5502static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5503 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5504 if (MD->size_overridden_methods() == 0) 5505 return Methods.count(MD->getCanonicalDecl()); 5506 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5507 E = MD->end_overridden_methods(); 5508 I != E; ++I) 5509 if (CheckMostOverridenMethods(*I, Methods)) 5510 return true; 5511 return false; 5512} 5513 5514/// \brief Member lookup function that determines whether a given C++ 5515/// method overloads virtual methods in a base class without overriding any, 5516/// to be used with CXXRecordDecl::lookupInBases(). 5517static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5518 CXXBasePath &Path, 5519 void *UserData) { 5520 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5521 5522 FindHiddenVirtualMethodData &Data 5523 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5524 5525 DeclarationName Name = Data.Method->getDeclName(); 5526 assert(Name.getNameKind() == DeclarationName::Identifier); 5527 5528 bool foundSameNameMethod = false; 5529 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5530 for (Path.Decls = BaseRecord->lookup(Name); 5531 !Path.Decls.empty(); 5532 Path.Decls = Path.Decls.slice(1)) { 5533 NamedDecl *D = Path.Decls.front(); 5534 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5535 MD = MD->getCanonicalDecl(); 5536 foundSameNameMethod = true; 5537 // Interested only in hidden virtual methods. 5538 if (!MD->isVirtual()) 5539 continue; 5540 // If the method we are checking overrides a method from its base 5541 // don't warn about the other overloaded methods. 5542 if (!Data.S->IsOverload(Data.Method, MD, false)) 5543 return true; 5544 // Collect the overload only if its hidden. 5545 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5546 overloadedMethods.push_back(MD); 5547 } 5548 } 5549 5550 if (foundSameNameMethod) 5551 Data.OverloadedMethods.append(overloadedMethods.begin(), 5552 overloadedMethods.end()); 5553 return foundSameNameMethod; 5554} 5555 5556/// \brief Add the most overriden methods from MD to Methods 5557static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5558 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5559 if (MD->size_overridden_methods() == 0) 5560 Methods.insert(MD->getCanonicalDecl()); 5561 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5562 E = MD->end_overridden_methods(); 5563 I != E; ++I) 5564 AddMostOverridenMethods(*I, Methods); 5565} 5566 5567/// \brief See if a method overloads virtual methods in a base class without 5568/// overriding any. 5569void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5570 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5571 MD->getLocation()) == DiagnosticsEngine::Ignored) 5572 return; 5573 if (!MD->getDeclName().isIdentifier()) 5574 return; 5575 5576 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5577 /*bool RecordPaths=*/false, 5578 /*bool DetectVirtual=*/false); 5579 FindHiddenVirtualMethodData Data; 5580 Data.Method = MD; 5581 Data.S = this; 5582 5583 // Keep the base methods that were overriden or introduced in the subclass 5584 // by 'using' in a set. A base method not in this set is hidden. 5585 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5586 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5587 NamedDecl *ND = *I; 5588 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5589 ND = shad->getTargetDecl(); 5590 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5591 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5592 } 5593 5594 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5595 !Data.OverloadedMethods.empty()) { 5596 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5597 << MD << (Data.OverloadedMethods.size() > 1); 5598 5599 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5600 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5601 PartialDiagnostic PD = PDiag( 5602 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5603 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5604 Diag(overloadedMD->getLocation(), PD); 5605 } 5606 } 5607} 5608 5609void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5610 Decl *TagDecl, 5611 SourceLocation LBrac, 5612 SourceLocation RBrac, 5613 AttributeList *AttrList) { 5614 if (!TagDecl) 5615 return; 5616 5617 AdjustDeclIfTemplate(TagDecl); 5618 5619 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5620 if (l->getKind() != AttributeList::AT_Visibility) 5621 continue; 5622 l->setInvalid(); 5623 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5624 l->getName(); 5625 } 5626 5627 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5628 // strict aliasing violation! 5629 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5630 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5631 5632 CheckCompletedCXXClass( 5633 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5634} 5635 5636/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5637/// special functions, such as the default constructor, copy 5638/// constructor, or destructor, to the given C++ class (C++ 5639/// [special]p1). This routine can only be executed just before the 5640/// definition of the class is complete. 5641void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5642 if (!ClassDecl->hasUserDeclaredConstructor()) 5643 ++ASTContext::NumImplicitDefaultConstructors; 5644 5645 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5646 ++ASTContext::NumImplicitCopyConstructors; 5647 5648 // If the properties or semantics of the copy constructor couldn't be 5649 // determined while the class was being declared, force a declaration 5650 // of it now. 5651 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5652 DeclareImplicitCopyConstructor(ClassDecl); 5653 } 5654 5655 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5656 ++ASTContext::NumImplicitMoveConstructors; 5657 5658 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5659 DeclareImplicitMoveConstructor(ClassDecl); 5660 } 5661 5662 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5663 ++ASTContext::NumImplicitCopyAssignmentOperators; 5664 5665 // If we have a dynamic class, then the copy assignment operator may be 5666 // virtual, so we have to declare it immediately. This ensures that, e.g., 5667 // it shows up in the right place in the vtable and that we diagnose 5668 // problems with the implicit exception specification. 5669 if (ClassDecl->isDynamicClass() || 5670 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5671 DeclareImplicitCopyAssignment(ClassDecl); 5672 } 5673 5674 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5675 ++ASTContext::NumImplicitMoveAssignmentOperators; 5676 5677 // Likewise for the move assignment operator. 5678 if (ClassDecl->isDynamicClass() || 5679 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5680 DeclareImplicitMoveAssignment(ClassDecl); 5681 } 5682 5683 if (!ClassDecl->hasUserDeclaredDestructor()) { 5684 ++ASTContext::NumImplicitDestructors; 5685 5686 // If we have a dynamic class, then the destructor may be virtual, so we 5687 // have to declare the destructor immediately. This ensures that, e.g., it 5688 // shows up in the right place in the vtable and that we diagnose problems 5689 // with the implicit exception specification. 5690 if (ClassDecl->isDynamicClass() || 5691 ClassDecl->needsOverloadResolutionForDestructor()) 5692 DeclareImplicitDestructor(ClassDecl); 5693 } 5694} 5695 5696void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5697 if (!D) 5698 return; 5699 5700 int NumParamList = D->getNumTemplateParameterLists(); 5701 for (int i = 0; i < NumParamList; i++) { 5702 TemplateParameterList* Params = D->getTemplateParameterList(i); 5703 for (TemplateParameterList::iterator Param = Params->begin(), 5704 ParamEnd = Params->end(); 5705 Param != ParamEnd; ++Param) { 5706 NamedDecl *Named = cast<NamedDecl>(*Param); 5707 if (Named->getDeclName()) { 5708 S->AddDecl(Named); 5709 IdResolver.AddDecl(Named); 5710 } 5711 } 5712 } 5713} 5714 5715void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5716 if (!D) 5717 return; 5718 5719 TemplateParameterList *Params = 0; 5720 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5721 Params = Template->getTemplateParameters(); 5722 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5723 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5724 Params = PartialSpec->getTemplateParameters(); 5725 else 5726 return; 5727 5728 for (TemplateParameterList::iterator Param = Params->begin(), 5729 ParamEnd = Params->end(); 5730 Param != ParamEnd; ++Param) { 5731 NamedDecl *Named = cast<NamedDecl>(*Param); 5732 if (Named->getDeclName()) { 5733 S->AddDecl(Named); 5734 IdResolver.AddDecl(Named); 5735 } 5736 } 5737} 5738 5739void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5740 if (!RecordD) return; 5741 AdjustDeclIfTemplate(RecordD); 5742 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5743 PushDeclContext(S, Record); 5744} 5745 5746void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5747 if (!RecordD) return; 5748 PopDeclContext(); 5749} 5750 5751/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5752/// parsing a top-level (non-nested) C++ class, and we are now 5753/// parsing those parts of the given Method declaration that could 5754/// not be parsed earlier (C++ [class.mem]p2), such as default 5755/// arguments. This action should enter the scope of the given 5756/// Method declaration as if we had just parsed the qualified method 5757/// name. However, it should not bring the parameters into scope; 5758/// that will be performed by ActOnDelayedCXXMethodParameter. 5759void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5760} 5761 5762/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5763/// C++ method declaration. We're (re-)introducing the given 5764/// function parameter into scope for use in parsing later parts of 5765/// the method declaration. For example, we could see an 5766/// ActOnParamDefaultArgument event for this parameter. 5767void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5768 if (!ParamD) 5769 return; 5770 5771 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5772 5773 // If this parameter has an unparsed default argument, clear it out 5774 // to make way for the parsed default argument. 5775 if (Param->hasUnparsedDefaultArg()) 5776 Param->setDefaultArg(0); 5777 5778 S->AddDecl(Param); 5779 if (Param->getDeclName()) 5780 IdResolver.AddDecl(Param); 5781} 5782 5783/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5784/// processing the delayed method declaration for Method. The method 5785/// declaration is now considered finished. There may be a separate 5786/// ActOnStartOfFunctionDef action later (not necessarily 5787/// immediately!) for this method, if it was also defined inside the 5788/// class body. 5789void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5790 if (!MethodD) 5791 return; 5792 5793 AdjustDeclIfTemplate(MethodD); 5794 5795 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5796 5797 // Now that we have our default arguments, check the constructor 5798 // again. It could produce additional diagnostics or affect whether 5799 // the class has implicitly-declared destructors, among other 5800 // things. 5801 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5802 CheckConstructor(Constructor); 5803 5804 // Check the default arguments, which we may have added. 5805 if (!Method->isInvalidDecl()) 5806 CheckCXXDefaultArguments(Method); 5807} 5808 5809/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5810/// the well-formedness of the constructor declarator @p D with type @p 5811/// R. If there are any errors in the declarator, this routine will 5812/// emit diagnostics and set the invalid bit to true. In any case, the type 5813/// will be updated to reflect a well-formed type for the constructor and 5814/// returned. 5815QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5816 StorageClass &SC) { 5817 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5818 5819 // C++ [class.ctor]p3: 5820 // A constructor shall not be virtual (10.3) or static (9.4). A 5821 // constructor can be invoked for a const, volatile or const 5822 // volatile object. A constructor shall not be declared const, 5823 // volatile, or const volatile (9.3.2). 5824 if (isVirtual) { 5825 if (!D.isInvalidType()) 5826 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5827 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5828 << SourceRange(D.getIdentifierLoc()); 5829 D.setInvalidType(); 5830 } 5831 if (SC == SC_Static) { 5832 if (!D.isInvalidType()) 5833 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5834 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5835 << SourceRange(D.getIdentifierLoc()); 5836 D.setInvalidType(); 5837 SC = SC_None; 5838 } 5839 5840 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5841 if (FTI.TypeQuals != 0) { 5842 if (FTI.TypeQuals & Qualifiers::Const) 5843 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5844 << "const" << SourceRange(D.getIdentifierLoc()); 5845 if (FTI.TypeQuals & Qualifiers::Volatile) 5846 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5847 << "volatile" << SourceRange(D.getIdentifierLoc()); 5848 if (FTI.TypeQuals & Qualifiers::Restrict) 5849 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5850 << "restrict" << SourceRange(D.getIdentifierLoc()); 5851 D.setInvalidType(); 5852 } 5853 5854 // C++0x [class.ctor]p4: 5855 // A constructor shall not be declared with a ref-qualifier. 5856 if (FTI.hasRefQualifier()) { 5857 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5858 << FTI.RefQualifierIsLValueRef 5859 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5860 D.setInvalidType(); 5861 } 5862 5863 // Rebuild the function type "R" without any type qualifiers (in 5864 // case any of the errors above fired) and with "void" as the 5865 // return type, since constructors don't have return types. 5866 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5867 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5868 return R; 5869 5870 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5871 EPI.TypeQuals = 0; 5872 EPI.RefQualifier = RQ_None; 5873 5874 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5875} 5876 5877/// CheckConstructor - Checks a fully-formed constructor for 5878/// well-formedness, issuing any diagnostics required. Returns true if 5879/// the constructor declarator is invalid. 5880void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5881 CXXRecordDecl *ClassDecl 5882 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5883 if (!ClassDecl) 5884 return Constructor->setInvalidDecl(); 5885 5886 // C++ [class.copy]p3: 5887 // A declaration of a constructor for a class X is ill-formed if 5888 // its first parameter is of type (optionally cv-qualified) X and 5889 // either there are no other parameters or else all other 5890 // parameters have default arguments. 5891 if (!Constructor->isInvalidDecl() && 5892 ((Constructor->getNumParams() == 1) || 5893 (Constructor->getNumParams() > 1 && 5894 Constructor->getParamDecl(1)->hasDefaultArg())) && 5895 Constructor->getTemplateSpecializationKind() 5896 != TSK_ImplicitInstantiation) { 5897 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5898 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5899 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5900 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5901 const char *ConstRef 5902 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5903 : " const &"; 5904 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5905 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5906 5907 // FIXME: Rather that making the constructor invalid, we should endeavor 5908 // to fix the type. 5909 Constructor->setInvalidDecl(); 5910 } 5911 } 5912} 5913 5914/// CheckDestructor - Checks a fully-formed destructor definition for 5915/// well-formedness, issuing any diagnostics required. Returns true 5916/// on error. 5917bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5918 CXXRecordDecl *RD = Destructor->getParent(); 5919 5920 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 5921 SourceLocation Loc; 5922 5923 if (!Destructor->isImplicit()) 5924 Loc = Destructor->getLocation(); 5925 else 5926 Loc = RD->getLocation(); 5927 5928 // If we have a virtual destructor, look up the deallocation function 5929 FunctionDecl *OperatorDelete = 0; 5930 DeclarationName Name = 5931 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5932 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5933 return true; 5934 5935 MarkFunctionReferenced(Loc, OperatorDelete); 5936 5937 Destructor->setOperatorDelete(OperatorDelete); 5938 } 5939 5940 return false; 5941} 5942 5943static inline bool 5944FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5945 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5946 FTI.ArgInfo[0].Param && 5947 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5948} 5949 5950/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5951/// the well-formednes of the destructor declarator @p D with type @p 5952/// R. If there are any errors in the declarator, this routine will 5953/// emit diagnostics and set the declarator to invalid. Even if this happens, 5954/// will be updated to reflect a well-formed type for the destructor and 5955/// returned. 5956QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5957 StorageClass& SC) { 5958 // C++ [class.dtor]p1: 5959 // [...] A typedef-name that names a class is a class-name 5960 // (7.1.3); however, a typedef-name that names a class shall not 5961 // be used as the identifier in the declarator for a destructor 5962 // declaration. 5963 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5964 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5965 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5966 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5967 else if (const TemplateSpecializationType *TST = 5968 DeclaratorType->getAs<TemplateSpecializationType>()) 5969 if (TST->isTypeAlias()) 5970 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5971 << DeclaratorType << 1; 5972 5973 // C++ [class.dtor]p2: 5974 // A destructor is used to destroy objects of its class type. A 5975 // destructor takes no parameters, and no return type can be 5976 // specified for it (not even void). The address of a destructor 5977 // shall not be taken. A destructor shall not be static. A 5978 // destructor can be invoked for a const, volatile or const 5979 // volatile object. A destructor shall not be declared const, 5980 // volatile or const volatile (9.3.2). 5981 if (SC == SC_Static) { 5982 if (!D.isInvalidType()) 5983 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5984 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5985 << SourceRange(D.getIdentifierLoc()) 5986 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5987 5988 SC = SC_None; 5989 } 5990 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5991 // Destructors don't have return types, but the parser will 5992 // happily parse something like: 5993 // 5994 // class X { 5995 // float ~X(); 5996 // }; 5997 // 5998 // The return type will be eliminated later. 5999 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 6000 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6001 << SourceRange(D.getIdentifierLoc()); 6002 } 6003 6004 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6005 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 6006 if (FTI.TypeQuals & Qualifiers::Const) 6007 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6008 << "const" << SourceRange(D.getIdentifierLoc()); 6009 if (FTI.TypeQuals & Qualifiers::Volatile) 6010 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6011 << "volatile" << SourceRange(D.getIdentifierLoc()); 6012 if (FTI.TypeQuals & Qualifiers::Restrict) 6013 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6014 << "restrict" << SourceRange(D.getIdentifierLoc()); 6015 D.setInvalidType(); 6016 } 6017 6018 // C++0x [class.dtor]p2: 6019 // A destructor shall not be declared with a ref-qualifier. 6020 if (FTI.hasRefQualifier()) { 6021 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6022 << FTI.RefQualifierIsLValueRef 6023 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6024 D.setInvalidType(); 6025 } 6026 6027 // Make sure we don't have any parameters. 6028 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6029 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6030 6031 // Delete the parameters. 6032 FTI.freeArgs(); 6033 D.setInvalidType(); 6034 } 6035 6036 // Make sure the destructor isn't variadic. 6037 if (FTI.isVariadic) { 6038 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6039 D.setInvalidType(); 6040 } 6041 6042 // Rebuild the function type "R" without any type qualifiers or 6043 // parameters (in case any of the errors above fired) and with 6044 // "void" as the return type, since destructors don't have return 6045 // types. 6046 if (!D.isInvalidType()) 6047 return R; 6048 6049 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6050 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6051 EPI.Variadic = false; 6052 EPI.TypeQuals = 0; 6053 EPI.RefQualifier = RQ_None; 6054 return Context.getFunctionType(Context.VoidTy, None, EPI); 6055} 6056 6057/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6058/// well-formednes of the conversion function declarator @p D with 6059/// type @p R. If there are any errors in the declarator, this routine 6060/// will emit diagnostics and return true. Otherwise, it will return 6061/// false. Either way, the type @p R will be updated to reflect a 6062/// well-formed type for the conversion operator. 6063void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6064 StorageClass& SC) { 6065 // C++ [class.conv.fct]p1: 6066 // Neither parameter types nor return type can be specified. The 6067 // type of a conversion function (8.3.5) is "function taking no 6068 // parameter returning conversion-type-id." 6069 if (SC == SC_Static) { 6070 if (!D.isInvalidType()) 6071 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6072 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6073 << D.getName().getSourceRange(); 6074 D.setInvalidType(); 6075 SC = SC_None; 6076 } 6077 6078 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6079 6080 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6081 // Conversion functions don't have return types, but the parser will 6082 // happily parse something like: 6083 // 6084 // class X { 6085 // float operator bool(); 6086 // }; 6087 // 6088 // The return type will be changed later anyway. 6089 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6090 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6091 << SourceRange(D.getIdentifierLoc()); 6092 D.setInvalidType(); 6093 } 6094 6095 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6096 6097 // Make sure we don't have any parameters. 6098 if (Proto->getNumArgs() > 0) { 6099 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6100 6101 // Delete the parameters. 6102 D.getFunctionTypeInfo().freeArgs(); 6103 D.setInvalidType(); 6104 } else if (Proto->isVariadic()) { 6105 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6106 D.setInvalidType(); 6107 } 6108 6109 // Diagnose "&operator bool()" and other such nonsense. This 6110 // is actually a gcc extension which we don't support. 6111 if (Proto->getResultType() != ConvType) { 6112 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6113 << Proto->getResultType(); 6114 D.setInvalidType(); 6115 ConvType = Proto->getResultType(); 6116 } 6117 6118 // C++ [class.conv.fct]p4: 6119 // The conversion-type-id shall not represent a function type nor 6120 // an array type. 6121 if (ConvType->isArrayType()) { 6122 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6123 ConvType = Context.getPointerType(ConvType); 6124 D.setInvalidType(); 6125 } else if (ConvType->isFunctionType()) { 6126 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6127 ConvType = Context.getPointerType(ConvType); 6128 D.setInvalidType(); 6129 } 6130 6131 // Rebuild the function type "R" without any parameters (in case any 6132 // of the errors above fired) and with the conversion type as the 6133 // return type. 6134 if (D.isInvalidType()) 6135 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6136 6137 // C++0x explicit conversion operators. 6138 if (D.getDeclSpec().isExplicitSpecified()) 6139 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6140 getLangOpts().CPlusPlus11 ? 6141 diag::warn_cxx98_compat_explicit_conversion_functions : 6142 diag::ext_explicit_conversion_functions) 6143 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6144} 6145 6146/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6147/// the declaration of the given C++ conversion function. This routine 6148/// is responsible for recording the conversion function in the C++ 6149/// class, if possible. 6150Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6151 assert(Conversion && "Expected to receive a conversion function declaration"); 6152 6153 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6154 6155 // Make sure we aren't redeclaring the conversion function. 6156 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6157 6158 // C++ [class.conv.fct]p1: 6159 // [...] A conversion function is never used to convert a 6160 // (possibly cv-qualified) object to the (possibly cv-qualified) 6161 // same object type (or a reference to it), to a (possibly 6162 // cv-qualified) base class of that type (or a reference to it), 6163 // or to (possibly cv-qualified) void. 6164 // FIXME: Suppress this warning if the conversion function ends up being a 6165 // virtual function that overrides a virtual function in a base class. 6166 QualType ClassType 6167 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6168 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6169 ConvType = ConvTypeRef->getPointeeType(); 6170 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6171 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6172 /* Suppress diagnostics for instantiations. */; 6173 else if (ConvType->isRecordType()) { 6174 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6175 if (ConvType == ClassType) 6176 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6177 << ClassType; 6178 else if (IsDerivedFrom(ClassType, ConvType)) 6179 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6180 << ClassType << ConvType; 6181 } else if (ConvType->isVoidType()) { 6182 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6183 << ClassType << ConvType; 6184 } 6185 6186 if (FunctionTemplateDecl *ConversionTemplate 6187 = Conversion->getDescribedFunctionTemplate()) 6188 return ConversionTemplate; 6189 6190 return Conversion; 6191} 6192 6193//===----------------------------------------------------------------------===// 6194// Namespace Handling 6195//===----------------------------------------------------------------------===// 6196 6197/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6198/// reopened. 6199static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6200 SourceLocation Loc, 6201 IdentifierInfo *II, bool *IsInline, 6202 NamespaceDecl *PrevNS) { 6203 assert(*IsInline != PrevNS->isInline()); 6204 6205 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6206 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6207 // inline namespaces, with the intention of bringing names into namespace std. 6208 // 6209 // We support this just well enough to get that case working; this is not 6210 // sufficient to support reopening namespaces as inline in general. 6211 if (*IsInline && II && II->getName().startswith("__atomic") && 6212 S.getSourceManager().isInSystemHeader(Loc)) { 6213 // Mark all prior declarations of the namespace as inline. 6214 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6215 NS = NS->getPreviousDecl()) 6216 NS->setInline(*IsInline); 6217 // Patch up the lookup table for the containing namespace. This isn't really 6218 // correct, but it's good enough for this particular case. 6219 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6220 E = PrevNS->decls_end(); I != E; ++I) 6221 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6222 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6223 return; 6224 } 6225 6226 if (PrevNS->isInline()) 6227 // The user probably just forgot the 'inline', so suggest that it 6228 // be added back. 6229 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6230 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6231 else 6232 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6233 << IsInline; 6234 6235 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6236 *IsInline = PrevNS->isInline(); 6237} 6238 6239/// ActOnStartNamespaceDef - This is called at the start of a namespace 6240/// definition. 6241Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6242 SourceLocation InlineLoc, 6243 SourceLocation NamespaceLoc, 6244 SourceLocation IdentLoc, 6245 IdentifierInfo *II, 6246 SourceLocation LBrace, 6247 AttributeList *AttrList) { 6248 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6249 // For anonymous namespace, take the location of the left brace. 6250 SourceLocation Loc = II ? IdentLoc : LBrace; 6251 bool IsInline = InlineLoc.isValid(); 6252 bool IsInvalid = false; 6253 bool IsStd = false; 6254 bool AddToKnown = false; 6255 Scope *DeclRegionScope = NamespcScope->getParent(); 6256 6257 NamespaceDecl *PrevNS = 0; 6258 if (II) { 6259 // C++ [namespace.def]p2: 6260 // The identifier in an original-namespace-definition shall not 6261 // have been previously defined in the declarative region in 6262 // which the original-namespace-definition appears. The 6263 // identifier in an original-namespace-definition is the name of 6264 // the namespace. Subsequently in that declarative region, it is 6265 // treated as an original-namespace-name. 6266 // 6267 // Since namespace names are unique in their scope, and we don't 6268 // look through using directives, just look for any ordinary names. 6269 6270 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6271 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6272 Decl::IDNS_Namespace; 6273 NamedDecl *PrevDecl = 0; 6274 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6275 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6276 ++I) { 6277 if ((*I)->getIdentifierNamespace() & IDNS) { 6278 PrevDecl = *I; 6279 break; 6280 } 6281 } 6282 6283 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6284 6285 if (PrevNS) { 6286 // This is an extended namespace definition. 6287 if (IsInline != PrevNS->isInline()) 6288 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6289 &IsInline, PrevNS); 6290 } else if (PrevDecl) { 6291 // This is an invalid name redefinition. 6292 Diag(Loc, diag::err_redefinition_different_kind) 6293 << II; 6294 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6295 IsInvalid = true; 6296 // Continue on to push Namespc as current DeclContext and return it. 6297 } else if (II->isStr("std") && 6298 CurContext->getRedeclContext()->isTranslationUnit()) { 6299 // This is the first "real" definition of the namespace "std", so update 6300 // our cache of the "std" namespace to point at this definition. 6301 PrevNS = getStdNamespace(); 6302 IsStd = true; 6303 AddToKnown = !IsInline; 6304 } else { 6305 // We've seen this namespace for the first time. 6306 AddToKnown = !IsInline; 6307 } 6308 } else { 6309 // Anonymous namespaces. 6310 6311 // Determine whether the parent already has an anonymous namespace. 6312 DeclContext *Parent = CurContext->getRedeclContext(); 6313 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6314 PrevNS = TU->getAnonymousNamespace(); 6315 } else { 6316 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6317 PrevNS = ND->getAnonymousNamespace(); 6318 } 6319 6320 if (PrevNS && IsInline != PrevNS->isInline()) 6321 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6322 &IsInline, PrevNS); 6323 } 6324 6325 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6326 StartLoc, Loc, II, PrevNS); 6327 if (IsInvalid) 6328 Namespc->setInvalidDecl(); 6329 6330 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6331 6332 // FIXME: Should we be merging attributes? 6333 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6334 PushNamespaceVisibilityAttr(Attr, Loc); 6335 6336 if (IsStd) 6337 StdNamespace = Namespc; 6338 if (AddToKnown) 6339 KnownNamespaces[Namespc] = false; 6340 6341 if (II) { 6342 PushOnScopeChains(Namespc, DeclRegionScope); 6343 } else { 6344 // Link the anonymous namespace into its parent. 6345 DeclContext *Parent = CurContext->getRedeclContext(); 6346 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6347 TU->setAnonymousNamespace(Namespc); 6348 } else { 6349 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6350 } 6351 6352 CurContext->addDecl(Namespc); 6353 6354 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6355 // behaves as if it were replaced by 6356 // namespace unique { /* empty body */ } 6357 // using namespace unique; 6358 // namespace unique { namespace-body } 6359 // where all occurrences of 'unique' in a translation unit are 6360 // replaced by the same identifier and this identifier differs 6361 // from all other identifiers in the entire program. 6362 6363 // We just create the namespace with an empty name and then add an 6364 // implicit using declaration, just like the standard suggests. 6365 // 6366 // CodeGen enforces the "universally unique" aspect by giving all 6367 // declarations semantically contained within an anonymous 6368 // namespace internal linkage. 6369 6370 if (!PrevNS) { 6371 UsingDirectiveDecl* UD 6372 = UsingDirectiveDecl::Create(Context, Parent, 6373 /* 'using' */ LBrace, 6374 /* 'namespace' */ SourceLocation(), 6375 /* qualifier */ NestedNameSpecifierLoc(), 6376 /* identifier */ SourceLocation(), 6377 Namespc, 6378 /* Ancestor */ Parent); 6379 UD->setImplicit(); 6380 Parent->addDecl(UD); 6381 } 6382 } 6383 6384 ActOnDocumentableDecl(Namespc); 6385 6386 // Although we could have an invalid decl (i.e. the namespace name is a 6387 // redefinition), push it as current DeclContext and try to continue parsing. 6388 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6389 // for the namespace has the declarations that showed up in that particular 6390 // namespace definition. 6391 PushDeclContext(NamespcScope, Namespc); 6392 return Namespc; 6393} 6394 6395/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6396/// is a namespace alias, returns the namespace it points to. 6397static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6398 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6399 return AD->getNamespace(); 6400 return dyn_cast_or_null<NamespaceDecl>(D); 6401} 6402 6403/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6404/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6405void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6406 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6407 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6408 Namespc->setRBraceLoc(RBrace); 6409 PopDeclContext(); 6410 if (Namespc->hasAttr<VisibilityAttr>()) 6411 PopPragmaVisibility(true, RBrace); 6412} 6413 6414CXXRecordDecl *Sema::getStdBadAlloc() const { 6415 return cast_or_null<CXXRecordDecl>( 6416 StdBadAlloc.get(Context.getExternalSource())); 6417} 6418 6419NamespaceDecl *Sema::getStdNamespace() const { 6420 return cast_or_null<NamespaceDecl>( 6421 StdNamespace.get(Context.getExternalSource())); 6422} 6423 6424/// \brief Retrieve the special "std" namespace, which may require us to 6425/// implicitly define the namespace. 6426NamespaceDecl *Sema::getOrCreateStdNamespace() { 6427 if (!StdNamespace) { 6428 // The "std" namespace has not yet been defined, so build one implicitly. 6429 StdNamespace = NamespaceDecl::Create(Context, 6430 Context.getTranslationUnitDecl(), 6431 /*Inline=*/false, 6432 SourceLocation(), SourceLocation(), 6433 &PP.getIdentifierTable().get("std"), 6434 /*PrevDecl=*/0); 6435 getStdNamespace()->setImplicit(true); 6436 } 6437 6438 return getStdNamespace(); 6439} 6440 6441bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6442 assert(getLangOpts().CPlusPlus && 6443 "Looking for std::initializer_list outside of C++."); 6444 6445 // We're looking for implicit instantiations of 6446 // template <typename E> class std::initializer_list. 6447 6448 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6449 return false; 6450 6451 ClassTemplateDecl *Template = 0; 6452 const TemplateArgument *Arguments = 0; 6453 6454 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6455 6456 ClassTemplateSpecializationDecl *Specialization = 6457 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6458 if (!Specialization) 6459 return false; 6460 6461 Template = Specialization->getSpecializedTemplate(); 6462 Arguments = Specialization->getTemplateArgs().data(); 6463 } else if (const TemplateSpecializationType *TST = 6464 Ty->getAs<TemplateSpecializationType>()) { 6465 Template = dyn_cast_or_null<ClassTemplateDecl>( 6466 TST->getTemplateName().getAsTemplateDecl()); 6467 Arguments = TST->getArgs(); 6468 } 6469 if (!Template) 6470 return false; 6471 6472 if (!StdInitializerList) { 6473 // Haven't recognized std::initializer_list yet, maybe this is it. 6474 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6475 if (TemplateClass->getIdentifier() != 6476 &PP.getIdentifierTable().get("initializer_list") || 6477 !getStdNamespace()->InEnclosingNamespaceSetOf( 6478 TemplateClass->getDeclContext())) 6479 return false; 6480 // This is a template called std::initializer_list, but is it the right 6481 // template? 6482 TemplateParameterList *Params = Template->getTemplateParameters(); 6483 if (Params->getMinRequiredArguments() != 1) 6484 return false; 6485 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6486 return false; 6487 6488 // It's the right template. 6489 StdInitializerList = Template; 6490 } 6491 6492 if (Template != StdInitializerList) 6493 return false; 6494 6495 // This is an instance of std::initializer_list. Find the argument type. 6496 if (Element) 6497 *Element = Arguments[0].getAsType(); 6498 return true; 6499} 6500 6501static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6502 NamespaceDecl *Std = S.getStdNamespace(); 6503 if (!Std) { 6504 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6505 return 0; 6506 } 6507 6508 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6509 Loc, Sema::LookupOrdinaryName); 6510 if (!S.LookupQualifiedName(Result, Std)) { 6511 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6512 return 0; 6513 } 6514 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6515 if (!Template) { 6516 Result.suppressDiagnostics(); 6517 // We found something weird. Complain about the first thing we found. 6518 NamedDecl *Found = *Result.begin(); 6519 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6520 return 0; 6521 } 6522 6523 // We found some template called std::initializer_list. Now verify that it's 6524 // correct. 6525 TemplateParameterList *Params = Template->getTemplateParameters(); 6526 if (Params->getMinRequiredArguments() != 1 || 6527 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6528 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6529 return 0; 6530 } 6531 6532 return Template; 6533} 6534 6535QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6536 if (!StdInitializerList) { 6537 StdInitializerList = LookupStdInitializerList(*this, Loc); 6538 if (!StdInitializerList) 6539 return QualType(); 6540 } 6541 6542 TemplateArgumentListInfo Args(Loc, Loc); 6543 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6544 Context.getTrivialTypeSourceInfo(Element, 6545 Loc))); 6546 return Context.getCanonicalType( 6547 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6548} 6549 6550bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6551 // C++ [dcl.init.list]p2: 6552 // A constructor is an initializer-list constructor if its first parameter 6553 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6554 // std::initializer_list<E> for some type E, and either there are no other 6555 // parameters or else all other parameters have default arguments. 6556 if (Ctor->getNumParams() < 1 || 6557 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6558 return false; 6559 6560 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6561 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6562 ArgType = RT->getPointeeType().getUnqualifiedType(); 6563 6564 return isStdInitializerList(ArgType, 0); 6565} 6566 6567/// \brief Determine whether a using statement is in a context where it will be 6568/// apply in all contexts. 6569static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6570 switch (CurContext->getDeclKind()) { 6571 case Decl::TranslationUnit: 6572 return true; 6573 case Decl::LinkageSpec: 6574 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6575 default: 6576 return false; 6577 } 6578} 6579 6580namespace { 6581 6582// Callback to only accept typo corrections that are namespaces. 6583class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6584 public: 6585 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6586 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6587 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6588 } 6589 return false; 6590 } 6591}; 6592 6593} 6594 6595static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6596 CXXScopeSpec &SS, 6597 SourceLocation IdentLoc, 6598 IdentifierInfo *Ident) { 6599 NamespaceValidatorCCC Validator; 6600 R.clear(); 6601 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6602 R.getLookupKind(), Sc, &SS, 6603 Validator)) { 6604 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6605 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6606 if (DeclContext *DC = S.computeDeclContext(SS, false)) { 6607 bool droppedSpecifier = Corrected.WillReplaceSpecifier() && 6608 Ident->getName().equals(CorrectedStr); 6609 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6610 << Ident << DC << droppedSpecifier << CorrectedQuotedStr 6611 << SS.getRange() << FixItHint::CreateReplacement( 6612 Corrected.getCorrectionRange(), CorrectedStr); 6613 } else { 6614 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6615 << Ident << CorrectedQuotedStr 6616 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6617 } 6618 6619 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6620 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6621 6622 R.addDecl(Corrected.getCorrectionDecl()); 6623 return true; 6624 } 6625 return false; 6626} 6627 6628Decl *Sema::ActOnUsingDirective(Scope *S, 6629 SourceLocation UsingLoc, 6630 SourceLocation NamespcLoc, 6631 CXXScopeSpec &SS, 6632 SourceLocation IdentLoc, 6633 IdentifierInfo *NamespcName, 6634 AttributeList *AttrList) { 6635 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6636 assert(NamespcName && "Invalid NamespcName."); 6637 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6638 6639 // This can only happen along a recovery path. 6640 while (S->getFlags() & Scope::TemplateParamScope) 6641 S = S->getParent(); 6642 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6643 6644 UsingDirectiveDecl *UDir = 0; 6645 NestedNameSpecifier *Qualifier = 0; 6646 if (SS.isSet()) 6647 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6648 6649 // Lookup namespace name. 6650 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6651 LookupParsedName(R, S, &SS); 6652 if (R.isAmbiguous()) 6653 return 0; 6654 6655 if (R.empty()) { 6656 R.clear(); 6657 // Allow "using namespace std;" or "using namespace ::std;" even if 6658 // "std" hasn't been defined yet, for GCC compatibility. 6659 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6660 NamespcName->isStr("std")) { 6661 Diag(IdentLoc, diag::ext_using_undefined_std); 6662 R.addDecl(getOrCreateStdNamespace()); 6663 R.resolveKind(); 6664 } 6665 // Otherwise, attempt typo correction. 6666 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6667 } 6668 6669 if (!R.empty()) { 6670 NamedDecl *Named = R.getFoundDecl(); 6671 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6672 && "expected namespace decl"); 6673 // C++ [namespace.udir]p1: 6674 // A using-directive specifies that the names in the nominated 6675 // namespace can be used in the scope in which the 6676 // using-directive appears after the using-directive. During 6677 // unqualified name lookup (3.4.1), the names appear as if they 6678 // were declared in the nearest enclosing namespace which 6679 // contains both the using-directive and the nominated 6680 // namespace. [Note: in this context, "contains" means "contains 6681 // directly or indirectly". ] 6682 6683 // Find enclosing context containing both using-directive and 6684 // nominated namespace. 6685 NamespaceDecl *NS = getNamespaceDecl(Named); 6686 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6687 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6688 CommonAncestor = CommonAncestor->getParent(); 6689 6690 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6691 SS.getWithLocInContext(Context), 6692 IdentLoc, Named, CommonAncestor); 6693 6694 if (IsUsingDirectiveInToplevelContext(CurContext) && 6695 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6696 Diag(IdentLoc, diag::warn_using_directive_in_header); 6697 } 6698 6699 PushUsingDirective(S, UDir); 6700 } else { 6701 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6702 } 6703 6704 if (UDir) 6705 ProcessDeclAttributeList(S, UDir, AttrList); 6706 6707 return UDir; 6708} 6709 6710void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6711 // If the scope has an associated entity and the using directive is at 6712 // namespace or translation unit scope, add the UsingDirectiveDecl into 6713 // its lookup structure so qualified name lookup can find it. 6714 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6715 if (Ctx && !Ctx->isFunctionOrMethod()) 6716 Ctx->addDecl(UDir); 6717 else 6718 // Otherwise, it is at block sope. The using-directives will affect lookup 6719 // only to the end of the scope. 6720 S->PushUsingDirective(UDir); 6721} 6722 6723 6724Decl *Sema::ActOnUsingDeclaration(Scope *S, 6725 AccessSpecifier AS, 6726 bool HasUsingKeyword, 6727 SourceLocation UsingLoc, 6728 CXXScopeSpec &SS, 6729 UnqualifiedId &Name, 6730 AttributeList *AttrList, 6731 bool IsTypeName, 6732 SourceLocation TypenameLoc) { 6733 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6734 6735 switch (Name.getKind()) { 6736 case UnqualifiedId::IK_ImplicitSelfParam: 6737 case UnqualifiedId::IK_Identifier: 6738 case UnqualifiedId::IK_OperatorFunctionId: 6739 case UnqualifiedId::IK_LiteralOperatorId: 6740 case UnqualifiedId::IK_ConversionFunctionId: 6741 break; 6742 6743 case UnqualifiedId::IK_ConstructorName: 6744 case UnqualifiedId::IK_ConstructorTemplateId: 6745 // C++11 inheriting constructors. 6746 Diag(Name.getLocStart(), 6747 getLangOpts().CPlusPlus11 ? 6748 diag::warn_cxx98_compat_using_decl_constructor : 6749 diag::err_using_decl_constructor) 6750 << SS.getRange(); 6751 6752 if (getLangOpts().CPlusPlus11) break; 6753 6754 return 0; 6755 6756 case UnqualifiedId::IK_DestructorName: 6757 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6758 << SS.getRange(); 6759 return 0; 6760 6761 case UnqualifiedId::IK_TemplateId: 6762 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6763 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6764 return 0; 6765 } 6766 6767 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6768 DeclarationName TargetName = TargetNameInfo.getName(); 6769 if (!TargetName) 6770 return 0; 6771 6772 // Warn about access declarations. 6773 if (!HasUsingKeyword) { 6774 Diag(Name.getLocStart(), 6775 getLangOpts().CPlusPlus11 ? diag::err_access_decl 6776 : diag::warn_access_decl_deprecated) 6777 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6778 } 6779 6780 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6781 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6782 return 0; 6783 6784 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6785 TargetNameInfo, AttrList, 6786 /* IsInstantiation */ false, 6787 IsTypeName, TypenameLoc); 6788 if (UD) 6789 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6790 6791 return UD; 6792} 6793 6794/// \brief Determine whether a using declaration considers the given 6795/// declarations as "equivalent", e.g., if they are redeclarations of 6796/// the same entity or are both typedefs of the same type. 6797static bool 6798IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6799 bool &SuppressRedeclaration) { 6800 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6801 SuppressRedeclaration = false; 6802 return true; 6803 } 6804 6805 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6806 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6807 SuppressRedeclaration = true; 6808 return Context.hasSameType(TD1->getUnderlyingType(), 6809 TD2->getUnderlyingType()); 6810 } 6811 6812 return false; 6813} 6814 6815 6816/// Determines whether to create a using shadow decl for a particular 6817/// decl, given the set of decls existing prior to this using lookup. 6818bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6819 const LookupResult &Previous) { 6820 // Diagnose finding a decl which is not from a base class of the 6821 // current class. We do this now because there are cases where this 6822 // function will silently decide not to build a shadow decl, which 6823 // will pre-empt further diagnostics. 6824 // 6825 // We don't need to do this in C++0x because we do the check once on 6826 // the qualifier. 6827 // 6828 // FIXME: diagnose the following if we care enough: 6829 // struct A { int foo; }; 6830 // struct B : A { using A::foo; }; 6831 // template <class T> struct C : A {}; 6832 // template <class T> struct D : C<T> { using B::foo; } // <--- 6833 // This is invalid (during instantiation) in C++03 because B::foo 6834 // resolves to the using decl in B, which is not a base class of D<T>. 6835 // We can't diagnose it immediately because C<T> is an unknown 6836 // specialization. The UsingShadowDecl in D<T> then points directly 6837 // to A::foo, which will look well-formed when we instantiate. 6838 // The right solution is to not collapse the shadow-decl chain. 6839 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6840 DeclContext *OrigDC = Orig->getDeclContext(); 6841 6842 // Handle enums and anonymous structs. 6843 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6844 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6845 while (OrigRec->isAnonymousStructOrUnion()) 6846 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6847 6848 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6849 if (OrigDC == CurContext) { 6850 Diag(Using->getLocation(), 6851 diag::err_using_decl_nested_name_specifier_is_current_class) 6852 << Using->getQualifierLoc().getSourceRange(); 6853 Diag(Orig->getLocation(), diag::note_using_decl_target); 6854 return true; 6855 } 6856 6857 Diag(Using->getQualifierLoc().getBeginLoc(), 6858 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6859 << Using->getQualifier() 6860 << cast<CXXRecordDecl>(CurContext) 6861 << Using->getQualifierLoc().getSourceRange(); 6862 Diag(Orig->getLocation(), diag::note_using_decl_target); 6863 return true; 6864 } 6865 } 6866 6867 if (Previous.empty()) return false; 6868 6869 NamedDecl *Target = Orig; 6870 if (isa<UsingShadowDecl>(Target)) 6871 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6872 6873 // If the target happens to be one of the previous declarations, we 6874 // don't have a conflict. 6875 // 6876 // FIXME: but we might be increasing its access, in which case we 6877 // should redeclare it. 6878 NamedDecl *NonTag = 0, *Tag = 0; 6879 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6880 I != E; ++I) { 6881 NamedDecl *D = (*I)->getUnderlyingDecl(); 6882 bool Result; 6883 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6884 return Result; 6885 6886 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6887 } 6888 6889 if (Target->isFunctionOrFunctionTemplate()) { 6890 FunctionDecl *FD; 6891 if (isa<FunctionTemplateDecl>(Target)) 6892 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6893 else 6894 FD = cast<FunctionDecl>(Target); 6895 6896 NamedDecl *OldDecl = 0; 6897 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6898 case Ovl_Overload: 6899 return false; 6900 6901 case Ovl_NonFunction: 6902 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6903 break; 6904 6905 // We found a decl with the exact signature. 6906 case Ovl_Match: 6907 // If we're in a record, we want to hide the target, so we 6908 // return true (without a diagnostic) to tell the caller not to 6909 // build a shadow decl. 6910 if (CurContext->isRecord()) 6911 return true; 6912 6913 // If we're not in a record, this is an error. 6914 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6915 break; 6916 } 6917 6918 Diag(Target->getLocation(), diag::note_using_decl_target); 6919 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6920 return true; 6921 } 6922 6923 // Target is not a function. 6924 6925 if (isa<TagDecl>(Target)) { 6926 // No conflict between a tag and a non-tag. 6927 if (!Tag) return false; 6928 6929 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6930 Diag(Target->getLocation(), diag::note_using_decl_target); 6931 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6932 return true; 6933 } 6934 6935 // No conflict between a tag and a non-tag. 6936 if (!NonTag) return false; 6937 6938 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6939 Diag(Target->getLocation(), diag::note_using_decl_target); 6940 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6941 return true; 6942} 6943 6944/// Builds a shadow declaration corresponding to a 'using' declaration. 6945UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6946 UsingDecl *UD, 6947 NamedDecl *Orig) { 6948 6949 // If we resolved to another shadow declaration, just coalesce them. 6950 NamedDecl *Target = Orig; 6951 if (isa<UsingShadowDecl>(Target)) { 6952 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6953 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6954 } 6955 6956 UsingShadowDecl *Shadow 6957 = UsingShadowDecl::Create(Context, CurContext, 6958 UD->getLocation(), UD, Target); 6959 UD->addShadowDecl(Shadow); 6960 6961 Shadow->setAccess(UD->getAccess()); 6962 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6963 Shadow->setInvalidDecl(); 6964 6965 if (S) 6966 PushOnScopeChains(Shadow, S); 6967 else 6968 CurContext->addDecl(Shadow); 6969 6970 6971 return Shadow; 6972} 6973 6974/// Hides a using shadow declaration. This is required by the current 6975/// using-decl implementation when a resolvable using declaration in a 6976/// class is followed by a declaration which would hide or override 6977/// one or more of the using decl's targets; for example: 6978/// 6979/// struct Base { void foo(int); }; 6980/// struct Derived : Base { 6981/// using Base::foo; 6982/// void foo(int); 6983/// }; 6984/// 6985/// The governing language is C++03 [namespace.udecl]p12: 6986/// 6987/// When a using-declaration brings names from a base class into a 6988/// derived class scope, member functions in the derived class 6989/// override and/or hide member functions with the same name and 6990/// parameter types in a base class (rather than conflicting). 6991/// 6992/// There are two ways to implement this: 6993/// (1) optimistically create shadow decls when they're not hidden 6994/// by existing declarations, or 6995/// (2) don't create any shadow decls (or at least don't make them 6996/// visible) until we've fully parsed/instantiated the class. 6997/// The problem with (1) is that we might have to retroactively remove 6998/// a shadow decl, which requires several O(n) operations because the 6999/// decl structures are (very reasonably) not designed for removal. 7000/// (2) avoids this but is very fiddly and phase-dependent. 7001void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 7002 if (Shadow->getDeclName().getNameKind() == 7003 DeclarationName::CXXConversionFunctionName) 7004 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 7005 7006 // Remove it from the DeclContext... 7007 Shadow->getDeclContext()->removeDecl(Shadow); 7008 7009 // ...and the scope, if applicable... 7010 if (S) { 7011 S->RemoveDecl(Shadow); 7012 IdResolver.RemoveDecl(Shadow); 7013 } 7014 7015 // ...and the using decl. 7016 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 7017 7018 // TODO: complain somehow if Shadow was used. It shouldn't 7019 // be possible for this to happen, because...? 7020} 7021 7022class UsingValidatorCCC : public CorrectionCandidateCallback { 7023public: 7024 UsingValidatorCCC(bool IsTypeName, bool IsInstantiation) 7025 : IsTypeName(IsTypeName), IsInstantiation(IsInstantiation) {} 7026 7027 virtual bool ValidateCandidate(const TypoCorrection &Candidate) { 7028 if (NamedDecl *ND = Candidate.getCorrectionDecl()) { 7029 if (isa<NamespaceDecl>(ND)) 7030 return false; 7031 // Completely unqualified names are invalid for a 'using' declaration. 7032 bool droppedSpecifier = Candidate.WillReplaceSpecifier() && 7033 !Candidate.getCorrectionSpecifier(); 7034 if (droppedSpecifier) 7035 return false; 7036 else if (isa<TypeDecl>(ND)) 7037 return IsTypeName || !IsInstantiation; 7038 else 7039 return !IsTypeName; 7040 } else { 7041 // Keywords are not valid here. 7042 return false; 7043 } 7044 } 7045 7046private: 7047 bool IsTypeName; 7048 bool IsInstantiation; 7049}; 7050 7051/// Builds a using declaration. 7052/// 7053/// \param IsInstantiation - Whether this call arises from an 7054/// instantiation of an unresolved using declaration. We treat 7055/// the lookup differently for these declarations. 7056NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7057 SourceLocation UsingLoc, 7058 CXXScopeSpec &SS, 7059 const DeclarationNameInfo &NameInfo, 7060 AttributeList *AttrList, 7061 bool IsInstantiation, 7062 bool IsTypeName, 7063 SourceLocation TypenameLoc) { 7064 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7065 SourceLocation IdentLoc = NameInfo.getLoc(); 7066 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7067 7068 // FIXME: We ignore attributes for now. 7069 7070 if (SS.isEmpty()) { 7071 Diag(IdentLoc, diag::err_using_requires_qualname); 7072 return 0; 7073 } 7074 7075 // Do the redeclaration lookup in the current scope. 7076 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7077 ForRedeclaration); 7078 Previous.setHideTags(false); 7079 if (S) { 7080 LookupName(Previous, S); 7081 7082 // It is really dumb that we have to do this. 7083 LookupResult::Filter F = Previous.makeFilter(); 7084 while (F.hasNext()) { 7085 NamedDecl *D = F.next(); 7086 if (!isDeclInScope(D, CurContext, S)) 7087 F.erase(); 7088 } 7089 F.done(); 7090 } else { 7091 assert(IsInstantiation && "no scope in non-instantiation"); 7092 assert(CurContext->isRecord() && "scope not record in instantiation"); 7093 LookupQualifiedName(Previous, CurContext); 7094 } 7095 7096 // Check for invalid redeclarations. 7097 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 7098 return 0; 7099 7100 // Check for bad qualifiers. 7101 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7102 return 0; 7103 7104 DeclContext *LookupContext = computeDeclContext(SS); 7105 NamedDecl *D; 7106 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7107 if (!LookupContext) { 7108 if (IsTypeName) { 7109 // FIXME: not all declaration name kinds are legal here 7110 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7111 UsingLoc, TypenameLoc, 7112 QualifierLoc, 7113 IdentLoc, NameInfo.getName()); 7114 } else { 7115 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7116 QualifierLoc, NameInfo); 7117 } 7118 } else { 7119 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7120 NameInfo, IsTypeName); 7121 } 7122 D->setAccess(AS); 7123 CurContext->addDecl(D); 7124 7125 if (!LookupContext) return D; 7126 UsingDecl *UD = cast<UsingDecl>(D); 7127 7128 if (RequireCompleteDeclContext(SS, LookupContext)) { 7129 UD->setInvalidDecl(); 7130 return UD; 7131 } 7132 7133 // The normal rules do not apply to inheriting constructor declarations. 7134 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7135 if (CheckInheritingConstructorUsingDecl(UD)) 7136 UD->setInvalidDecl(); 7137 return UD; 7138 } 7139 7140 // Otherwise, look up the target name. 7141 7142 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7143 7144 // Unlike most lookups, we don't always want to hide tag 7145 // declarations: tag names are visible through the using declaration 7146 // even if hidden by ordinary names, *except* in a dependent context 7147 // where it's important for the sanity of two-phase lookup. 7148 if (!IsInstantiation) 7149 R.setHideTags(false); 7150 7151 // For the purposes of this lookup, we have a base object type 7152 // equal to that of the current context. 7153 if (CurContext->isRecord()) { 7154 R.setBaseObjectType( 7155 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7156 } 7157 7158 LookupQualifiedName(R, LookupContext); 7159 7160 // Try to correct typos if possible. 7161 if (R.empty()) { 7162 UsingValidatorCCC CCC(IsTypeName, IsInstantiation); 7163 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(), 7164 R.getLookupKind(), S, &SS, CCC)){ 7165 // We reject any correction for which ND would be NULL. 7166 NamedDecl *ND = Corrected.getCorrectionDecl(); 7167 std::string CorrectedStr(Corrected.getAsString(getLangOpts())); 7168 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOpts())); 7169 R.setLookupName(Corrected.getCorrection()); 7170 R.addDecl(ND); 7171 // We reject candidates where droppedSpecifier == true, hence the 7172 // literal '0' below. 7173 Diag(R.getNameLoc(), diag::err_no_member_suggest) 7174 << NameInfo.getName() << LookupContext << 0 7175 << CorrectedQuotedStr << SS.getRange() 7176 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 7177 CorrectedStr); 7178 Diag(ND->getLocation(), diag::note_previous_decl) 7179 << CorrectedQuotedStr; 7180 } else { 7181 Diag(IdentLoc, diag::err_no_member) 7182 << NameInfo.getName() << LookupContext << SS.getRange(); 7183 UD->setInvalidDecl(); 7184 return UD; 7185 } 7186 } 7187 7188 if (R.isAmbiguous()) { 7189 UD->setInvalidDecl(); 7190 return UD; 7191 } 7192 7193 if (IsTypeName) { 7194 // If we asked for a typename and got a non-type decl, error out. 7195 if (!R.getAsSingle<TypeDecl>()) { 7196 Diag(IdentLoc, diag::err_using_typename_non_type); 7197 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7198 Diag((*I)->getUnderlyingDecl()->getLocation(), 7199 diag::note_using_decl_target); 7200 UD->setInvalidDecl(); 7201 return UD; 7202 } 7203 } else { 7204 // If we asked for a non-typename and we got a type, error out, 7205 // but only if this is an instantiation of an unresolved using 7206 // decl. Otherwise just silently find the type name. 7207 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7208 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7209 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7210 UD->setInvalidDecl(); 7211 return UD; 7212 } 7213 } 7214 7215 // C++0x N2914 [namespace.udecl]p6: 7216 // A using-declaration shall not name a namespace. 7217 if (R.getAsSingle<NamespaceDecl>()) { 7218 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7219 << SS.getRange(); 7220 UD->setInvalidDecl(); 7221 return UD; 7222 } 7223 7224 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7225 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7226 BuildUsingShadowDecl(S, UD, *I); 7227 } 7228 7229 return UD; 7230} 7231 7232/// Additional checks for a using declaration referring to a constructor name. 7233bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7234 assert(!UD->isTypeName() && "expecting a constructor name"); 7235 7236 const Type *SourceType = UD->getQualifier()->getAsType(); 7237 assert(SourceType && 7238 "Using decl naming constructor doesn't have type in scope spec."); 7239 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7240 7241 // Check whether the named type is a direct base class. 7242 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7243 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7244 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7245 BaseIt != BaseE; ++BaseIt) { 7246 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7247 if (CanonicalSourceType == BaseType) 7248 break; 7249 if (BaseIt->getType()->isDependentType()) 7250 break; 7251 } 7252 7253 if (BaseIt == BaseE) { 7254 // Did not find SourceType in the bases. 7255 Diag(UD->getUsingLocation(), 7256 diag::err_using_decl_constructor_not_in_direct_base) 7257 << UD->getNameInfo().getSourceRange() 7258 << QualType(SourceType, 0) << TargetClass; 7259 return true; 7260 } 7261 7262 if (!CurContext->isDependentContext()) 7263 BaseIt->setInheritConstructors(); 7264 7265 return false; 7266} 7267 7268/// Checks that the given using declaration is not an invalid 7269/// redeclaration. Note that this is checking only for the using decl 7270/// itself, not for any ill-formedness among the UsingShadowDecls. 7271bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7272 bool isTypeName, 7273 const CXXScopeSpec &SS, 7274 SourceLocation NameLoc, 7275 const LookupResult &Prev) { 7276 // C++03 [namespace.udecl]p8: 7277 // C++0x [namespace.udecl]p10: 7278 // A using-declaration is a declaration and can therefore be used 7279 // repeatedly where (and only where) multiple declarations are 7280 // allowed. 7281 // 7282 // That's in non-member contexts. 7283 if (!CurContext->getRedeclContext()->isRecord()) 7284 return false; 7285 7286 NestedNameSpecifier *Qual 7287 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7288 7289 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7290 NamedDecl *D = *I; 7291 7292 bool DTypename; 7293 NestedNameSpecifier *DQual; 7294 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7295 DTypename = UD->isTypeName(); 7296 DQual = UD->getQualifier(); 7297 } else if (UnresolvedUsingValueDecl *UD 7298 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7299 DTypename = false; 7300 DQual = UD->getQualifier(); 7301 } else if (UnresolvedUsingTypenameDecl *UD 7302 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7303 DTypename = true; 7304 DQual = UD->getQualifier(); 7305 } else continue; 7306 7307 // using decls differ if one says 'typename' and the other doesn't. 7308 // FIXME: non-dependent using decls? 7309 if (isTypeName != DTypename) continue; 7310 7311 // using decls differ if they name different scopes (but note that 7312 // template instantiation can cause this check to trigger when it 7313 // didn't before instantiation). 7314 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7315 Context.getCanonicalNestedNameSpecifier(DQual)) 7316 continue; 7317 7318 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7319 Diag(D->getLocation(), diag::note_using_decl) << 1; 7320 return true; 7321 } 7322 7323 return false; 7324} 7325 7326 7327/// Checks that the given nested-name qualifier used in a using decl 7328/// in the current context is appropriately related to the current 7329/// scope. If an error is found, diagnoses it and returns true. 7330bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7331 const CXXScopeSpec &SS, 7332 SourceLocation NameLoc) { 7333 DeclContext *NamedContext = computeDeclContext(SS); 7334 7335 if (!CurContext->isRecord()) { 7336 // C++03 [namespace.udecl]p3: 7337 // C++0x [namespace.udecl]p8: 7338 // A using-declaration for a class member shall be a member-declaration. 7339 7340 // If we weren't able to compute a valid scope, it must be a 7341 // dependent class scope. 7342 if (!NamedContext || NamedContext->isRecord()) { 7343 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7344 << SS.getRange(); 7345 return true; 7346 } 7347 7348 // Otherwise, everything is known to be fine. 7349 return false; 7350 } 7351 7352 // The current scope is a record. 7353 7354 // If the named context is dependent, we can't decide much. 7355 if (!NamedContext) { 7356 // FIXME: in C++0x, we can diagnose if we can prove that the 7357 // nested-name-specifier does not refer to a base class, which is 7358 // still possible in some cases. 7359 7360 // Otherwise we have to conservatively report that things might be 7361 // okay. 7362 return false; 7363 } 7364 7365 if (!NamedContext->isRecord()) { 7366 // Ideally this would point at the last name in the specifier, 7367 // but we don't have that level of source info. 7368 Diag(SS.getRange().getBegin(), 7369 diag::err_using_decl_nested_name_specifier_is_not_class) 7370 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7371 return true; 7372 } 7373 7374 if (!NamedContext->isDependentContext() && 7375 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7376 return true; 7377 7378 if (getLangOpts().CPlusPlus11) { 7379 // C++0x [namespace.udecl]p3: 7380 // In a using-declaration used as a member-declaration, the 7381 // nested-name-specifier shall name a base class of the class 7382 // being defined. 7383 7384 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7385 cast<CXXRecordDecl>(NamedContext))) { 7386 if (CurContext == NamedContext) { 7387 Diag(NameLoc, 7388 diag::err_using_decl_nested_name_specifier_is_current_class) 7389 << SS.getRange(); 7390 return true; 7391 } 7392 7393 Diag(SS.getRange().getBegin(), 7394 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7395 << (NestedNameSpecifier*) SS.getScopeRep() 7396 << cast<CXXRecordDecl>(CurContext) 7397 << SS.getRange(); 7398 return true; 7399 } 7400 7401 return false; 7402 } 7403 7404 // C++03 [namespace.udecl]p4: 7405 // A using-declaration used as a member-declaration shall refer 7406 // to a member of a base class of the class being defined [etc.]. 7407 7408 // Salient point: SS doesn't have to name a base class as long as 7409 // lookup only finds members from base classes. Therefore we can 7410 // diagnose here only if we can prove that that can't happen, 7411 // i.e. if the class hierarchies provably don't intersect. 7412 7413 // TODO: it would be nice if "definitely valid" results were cached 7414 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7415 // need to be repeated. 7416 7417 struct UserData { 7418 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7419 7420 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7421 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7422 Data->Bases.insert(Base); 7423 return true; 7424 } 7425 7426 bool hasDependentBases(const CXXRecordDecl *Class) { 7427 return !Class->forallBases(collect, this); 7428 } 7429 7430 /// Returns true if the base is dependent or is one of the 7431 /// accumulated base classes. 7432 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7433 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7434 return !Data->Bases.count(Base); 7435 } 7436 7437 bool mightShareBases(const CXXRecordDecl *Class) { 7438 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7439 } 7440 }; 7441 7442 UserData Data; 7443 7444 // Returns false if we find a dependent base. 7445 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7446 return false; 7447 7448 // Returns false if the class has a dependent base or if it or one 7449 // of its bases is present in the base set of the current context. 7450 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7451 return false; 7452 7453 Diag(SS.getRange().getBegin(), 7454 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7455 << (NestedNameSpecifier*) SS.getScopeRep() 7456 << cast<CXXRecordDecl>(CurContext) 7457 << SS.getRange(); 7458 7459 return true; 7460} 7461 7462Decl *Sema::ActOnAliasDeclaration(Scope *S, 7463 AccessSpecifier AS, 7464 MultiTemplateParamsArg TemplateParamLists, 7465 SourceLocation UsingLoc, 7466 UnqualifiedId &Name, 7467 AttributeList *AttrList, 7468 TypeResult Type) { 7469 // Skip up to the relevant declaration scope. 7470 while (S->getFlags() & Scope::TemplateParamScope) 7471 S = S->getParent(); 7472 assert((S->getFlags() & Scope::DeclScope) && 7473 "got alias-declaration outside of declaration scope"); 7474 7475 if (Type.isInvalid()) 7476 return 0; 7477 7478 bool Invalid = false; 7479 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7480 TypeSourceInfo *TInfo = 0; 7481 GetTypeFromParser(Type.get(), &TInfo); 7482 7483 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7484 return 0; 7485 7486 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7487 UPPC_DeclarationType)) { 7488 Invalid = true; 7489 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7490 TInfo->getTypeLoc().getBeginLoc()); 7491 } 7492 7493 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7494 LookupName(Previous, S); 7495 7496 // Warn about shadowing the name of a template parameter. 7497 if (Previous.isSingleResult() && 7498 Previous.getFoundDecl()->isTemplateParameter()) { 7499 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7500 Previous.clear(); 7501 } 7502 7503 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7504 "name in alias declaration must be an identifier"); 7505 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7506 Name.StartLocation, 7507 Name.Identifier, TInfo); 7508 7509 NewTD->setAccess(AS); 7510 7511 if (Invalid) 7512 NewTD->setInvalidDecl(); 7513 7514 ProcessDeclAttributeList(S, NewTD, AttrList); 7515 7516 CheckTypedefForVariablyModifiedType(S, NewTD); 7517 Invalid |= NewTD->isInvalidDecl(); 7518 7519 bool Redeclaration = false; 7520 7521 NamedDecl *NewND; 7522 if (TemplateParamLists.size()) { 7523 TypeAliasTemplateDecl *OldDecl = 0; 7524 TemplateParameterList *OldTemplateParams = 0; 7525 7526 if (TemplateParamLists.size() != 1) { 7527 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7528 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7529 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7530 } 7531 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7532 7533 // Only consider previous declarations in the same scope. 7534 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7535 /*ExplicitInstantiationOrSpecialization*/false); 7536 if (!Previous.empty()) { 7537 Redeclaration = true; 7538 7539 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7540 if (!OldDecl && !Invalid) { 7541 Diag(UsingLoc, diag::err_redefinition_different_kind) 7542 << Name.Identifier; 7543 7544 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7545 if (OldD->getLocation().isValid()) 7546 Diag(OldD->getLocation(), diag::note_previous_definition); 7547 7548 Invalid = true; 7549 } 7550 7551 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7552 if (TemplateParameterListsAreEqual(TemplateParams, 7553 OldDecl->getTemplateParameters(), 7554 /*Complain=*/true, 7555 TPL_TemplateMatch)) 7556 OldTemplateParams = OldDecl->getTemplateParameters(); 7557 else 7558 Invalid = true; 7559 7560 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7561 if (!Invalid && 7562 !Context.hasSameType(OldTD->getUnderlyingType(), 7563 NewTD->getUnderlyingType())) { 7564 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7565 // but we can't reasonably accept it. 7566 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7567 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7568 if (OldTD->getLocation().isValid()) 7569 Diag(OldTD->getLocation(), diag::note_previous_definition); 7570 Invalid = true; 7571 } 7572 } 7573 } 7574 7575 // Merge any previous default template arguments into our parameters, 7576 // and check the parameter list. 7577 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7578 TPC_TypeAliasTemplate)) 7579 return 0; 7580 7581 TypeAliasTemplateDecl *NewDecl = 7582 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7583 Name.Identifier, TemplateParams, 7584 NewTD); 7585 7586 NewDecl->setAccess(AS); 7587 7588 if (Invalid) 7589 NewDecl->setInvalidDecl(); 7590 else if (OldDecl) 7591 NewDecl->setPreviousDeclaration(OldDecl); 7592 7593 NewND = NewDecl; 7594 } else { 7595 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7596 NewND = NewTD; 7597 } 7598 7599 if (!Redeclaration) 7600 PushOnScopeChains(NewND, S); 7601 7602 ActOnDocumentableDecl(NewND); 7603 return NewND; 7604} 7605 7606Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7607 SourceLocation NamespaceLoc, 7608 SourceLocation AliasLoc, 7609 IdentifierInfo *Alias, 7610 CXXScopeSpec &SS, 7611 SourceLocation IdentLoc, 7612 IdentifierInfo *Ident) { 7613 7614 // Lookup the namespace name. 7615 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7616 LookupParsedName(R, S, &SS); 7617 7618 // Check if we have a previous declaration with the same name. 7619 NamedDecl *PrevDecl 7620 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7621 ForRedeclaration); 7622 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7623 PrevDecl = 0; 7624 7625 if (PrevDecl) { 7626 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7627 // We already have an alias with the same name that points to the same 7628 // namespace, so don't create a new one. 7629 // FIXME: At some point, we'll want to create the (redundant) 7630 // declaration to maintain better source information. 7631 if (!R.isAmbiguous() && !R.empty() && 7632 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7633 return 0; 7634 } 7635 7636 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7637 diag::err_redefinition_different_kind; 7638 Diag(AliasLoc, DiagID) << Alias; 7639 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7640 return 0; 7641 } 7642 7643 if (R.isAmbiguous()) 7644 return 0; 7645 7646 if (R.empty()) { 7647 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7648 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7649 return 0; 7650 } 7651 } 7652 7653 NamespaceAliasDecl *AliasDecl = 7654 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7655 Alias, SS.getWithLocInContext(Context), 7656 IdentLoc, R.getFoundDecl()); 7657 7658 PushOnScopeChains(AliasDecl, S); 7659 return AliasDecl; 7660} 7661 7662Sema::ImplicitExceptionSpecification 7663Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7664 CXXMethodDecl *MD) { 7665 CXXRecordDecl *ClassDecl = MD->getParent(); 7666 7667 // C++ [except.spec]p14: 7668 // An implicitly declared special member function (Clause 12) shall have an 7669 // exception-specification. [...] 7670 ImplicitExceptionSpecification ExceptSpec(*this); 7671 if (ClassDecl->isInvalidDecl()) 7672 return ExceptSpec; 7673 7674 // Direct base-class constructors. 7675 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7676 BEnd = ClassDecl->bases_end(); 7677 B != BEnd; ++B) { 7678 if (B->isVirtual()) // Handled below. 7679 continue; 7680 7681 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7682 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7683 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7684 // If this is a deleted function, add it anyway. This might be conformant 7685 // with the standard. This might not. I'm not sure. It might not matter. 7686 if (Constructor) 7687 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7688 } 7689 } 7690 7691 // Virtual base-class constructors. 7692 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7693 BEnd = ClassDecl->vbases_end(); 7694 B != BEnd; ++B) { 7695 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7696 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7697 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7698 // If this is a deleted function, add it anyway. This might be conformant 7699 // with the standard. This might not. I'm not sure. It might not matter. 7700 if (Constructor) 7701 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7702 } 7703 } 7704 7705 // Field constructors. 7706 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7707 FEnd = ClassDecl->field_end(); 7708 F != FEnd; ++F) { 7709 if (F->hasInClassInitializer()) { 7710 if (Expr *E = F->getInClassInitializer()) 7711 ExceptSpec.CalledExpr(E); 7712 else if (!F->isInvalidDecl()) 7713 // DR1351: 7714 // If the brace-or-equal-initializer of a non-static data member 7715 // invokes a defaulted default constructor of its class or of an 7716 // enclosing class in a potentially evaluated subexpression, the 7717 // program is ill-formed. 7718 // 7719 // This resolution is unworkable: the exception specification of the 7720 // default constructor can be needed in an unevaluated context, in 7721 // particular, in the operand of a noexcept-expression, and we can be 7722 // unable to compute an exception specification for an enclosed class. 7723 // 7724 // We do not allow an in-class initializer to require the evaluation 7725 // of the exception specification for any in-class initializer whose 7726 // definition is not lexically complete. 7727 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7728 } else if (const RecordType *RecordTy 7729 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7730 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7731 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7732 // If this is a deleted function, add it anyway. This might be conformant 7733 // with the standard. This might not. I'm not sure. It might not matter. 7734 // In particular, the problem is that this function never gets called. It 7735 // might just be ill-formed because this function attempts to refer to 7736 // a deleted function here. 7737 if (Constructor) 7738 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7739 } 7740 } 7741 7742 return ExceptSpec; 7743} 7744 7745Sema::ImplicitExceptionSpecification 7746Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7747 CXXRecordDecl *ClassDecl = CD->getParent(); 7748 7749 // C++ [except.spec]p14: 7750 // An inheriting constructor [...] shall have an exception-specification. [...] 7751 ImplicitExceptionSpecification ExceptSpec(*this); 7752 if (ClassDecl->isInvalidDecl()) 7753 return ExceptSpec; 7754 7755 // Inherited constructor. 7756 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7757 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7758 // FIXME: Copying or moving the parameters could add extra exceptions to the 7759 // set, as could the default arguments for the inherited constructor. This 7760 // will be addressed when we implement the resolution of core issue 1351. 7761 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7762 7763 // Direct base-class constructors. 7764 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7765 BEnd = ClassDecl->bases_end(); 7766 B != BEnd; ++B) { 7767 if (B->isVirtual()) // Handled below. 7768 continue; 7769 7770 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7771 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7772 if (BaseClassDecl == InheritedDecl) 7773 continue; 7774 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7775 if (Constructor) 7776 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7777 } 7778 } 7779 7780 // Virtual base-class constructors. 7781 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7782 BEnd = ClassDecl->vbases_end(); 7783 B != BEnd; ++B) { 7784 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7785 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7786 if (BaseClassDecl == InheritedDecl) 7787 continue; 7788 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7789 if (Constructor) 7790 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7791 } 7792 } 7793 7794 // Field constructors. 7795 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7796 FEnd = ClassDecl->field_end(); 7797 F != FEnd; ++F) { 7798 if (F->hasInClassInitializer()) { 7799 if (Expr *E = F->getInClassInitializer()) 7800 ExceptSpec.CalledExpr(E); 7801 else if (!F->isInvalidDecl()) 7802 Diag(CD->getLocation(), 7803 diag::err_in_class_initializer_references_def_ctor) << CD; 7804 } else if (const RecordType *RecordTy 7805 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7806 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7807 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7808 if (Constructor) 7809 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7810 } 7811 } 7812 7813 return ExceptSpec; 7814} 7815 7816namespace { 7817/// RAII object to register a special member as being currently declared. 7818struct DeclaringSpecialMember { 7819 Sema &S; 7820 Sema::SpecialMemberDecl D; 7821 bool WasAlreadyBeingDeclared; 7822 7823 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7824 : S(S), D(RD, CSM) { 7825 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7826 if (WasAlreadyBeingDeclared) 7827 // This almost never happens, but if it does, ensure that our cache 7828 // doesn't contain a stale result. 7829 S.SpecialMemberCache.clear(); 7830 7831 // FIXME: Register a note to be produced if we encounter an error while 7832 // declaring the special member. 7833 } 7834 ~DeclaringSpecialMember() { 7835 if (!WasAlreadyBeingDeclared) 7836 S.SpecialMembersBeingDeclared.erase(D); 7837 } 7838 7839 /// \brief Are we already trying to declare this special member? 7840 bool isAlreadyBeingDeclared() const { 7841 return WasAlreadyBeingDeclared; 7842 } 7843}; 7844} 7845 7846CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7847 CXXRecordDecl *ClassDecl) { 7848 // C++ [class.ctor]p5: 7849 // A default constructor for a class X is a constructor of class X 7850 // that can be called without an argument. If there is no 7851 // user-declared constructor for class X, a default constructor is 7852 // implicitly declared. An implicitly-declared default constructor 7853 // is an inline public member of its class. 7854 assert(ClassDecl->needsImplicitDefaultConstructor() && 7855 "Should not build implicit default constructor!"); 7856 7857 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7858 if (DSM.isAlreadyBeingDeclared()) 7859 return 0; 7860 7861 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7862 CXXDefaultConstructor, 7863 false); 7864 7865 // Create the actual constructor declaration. 7866 CanQualType ClassType 7867 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7868 SourceLocation ClassLoc = ClassDecl->getLocation(); 7869 DeclarationName Name 7870 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7871 DeclarationNameInfo NameInfo(Name, ClassLoc); 7872 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7873 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7874 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7875 Constexpr); 7876 DefaultCon->setAccess(AS_public); 7877 DefaultCon->setDefaulted(); 7878 DefaultCon->setImplicit(); 7879 7880 // Build an exception specification pointing back at this constructor. 7881 FunctionProtoType::ExtProtoInfo EPI; 7882 EPI.ExceptionSpecType = EST_Unevaluated; 7883 EPI.ExceptionSpecDecl = DefaultCon; 7884 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 7885 7886 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7887 // constructors is easy to compute. 7888 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7889 7890 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7891 SetDeclDeleted(DefaultCon, ClassLoc); 7892 7893 // Note that we have declared this constructor. 7894 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7895 7896 if (Scope *S = getScopeForContext(ClassDecl)) 7897 PushOnScopeChains(DefaultCon, S, false); 7898 ClassDecl->addDecl(DefaultCon); 7899 7900 return DefaultCon; 7901} 7902 7903void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7904 CXXConstructorDecl *Constructor) { 7905 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7906 !Constructor->doesThisDeclarationHaveABody() && 7907 !Constructor->isDeleted()) && 7908 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7909 7910 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7911 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7912 7913 SynthesizedFunctionScope Scope(*this, Constructor); 7914 DiagnosticErrorTrap Trap(Diags); 7915 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7916 Trap.hasErrorOccurred()) { 7917 Diag(CurrentLocation, diag::note_member_synthesized_at) 7918 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7919 Constructor->setInvalidDecl(); 7920 return; 7921 } 7922 7923 SourceLocation Loc = Constructor->getLocation(); 7924 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7925 7926 Constructor->setUsed(); 7927 MarkVTableUsed(CurrentLocation, ClassDecl); 7928 7929 if (ASTMutationListener *L = getASTMutationListener()) { 7930 L->CompletedImplicitDefinition(Constructor); 7931 } 7932} 7933 7934void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7935 // Check that any explicitly-defaulted methods have exception specifications 7936 // compatible with their implicit exception specifications. 7937 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7938} 7939 7940namespace { 7941/// Information on inheriting constructors to declare. 7942class InheritingConstructorInfo { 7943public: 7944 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 7945 : SemaRef(SemaRef), Derived(Derived) { 7946 // Mark the constructors that we already have in the derived class. 7947 // 7948 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7949 // unless there is a user-declared constructor with the same signature in 7950 // the class where the using-declaration appears. 7951 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 7952 } 7953 7954 void inheritAll(CXXRecordDecl *RD) { 7955 visitAll(RD, &InheritingConstructorInfo::inherit); 7956 } 7957 7958private: 7959 /// Information about an inheriting constructor. 7960 struct InheritingConstructor { 7961 InheritingConstructor() 7962 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 7963 7964 /// If \c true, a constructor with this signature is already declared 7965 /// in the derived class. 7966 bool DeclaredInDerived; 7967 7968 /// The constructor which is inherited. 7969 const CXXConstructorDecl *BaseCtor; 7970 7971 /// The derived constructor we declared. 7972 CXXConstructorDecl *DerivedCtor; 7973 }; 7974 7975 /// Inheriting constructors with a given canonical type. There can be at 7976 /// most one such non-template constructor, and any number of templated 7977 /// constructors. 7978 struct InheritingConstructorsForType { 7979 InheritingConstructor NonTemplate; 7980 llvm::SmallVector< 7981 std::pair<TemplateParameterList*, InheritingConstructor>, 4> Templates; 7982 7983 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 7984 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 7985 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 7986 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 7987 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 7988 false, S.TPL_TemplateMatch)) 7989 return Templates[I].second; 7990 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 7991 return Templates.back().second; 7992 } 7993 7994 return NonTemplate; 7995 } 7996 }; 7997 7998 /// Get or create the inheriting constructor record for a constructor. 7999 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 8000 QualType CtorType) { 8001 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 8002 .getEntry(SemaRef, Ctor); 8003 } 8004 8005 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 8006 8007 /// Process all constructors for a class. 8008 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 8009 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 8010 CtorE = RD->ctor_end(); 8011 CtorIt != CtorE; ++CtorIt) 8012 (this->*Callback)(*CtorIt); 8013 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 8014 I(RD->decls_begin()), E(RD->decls_end()); 8015 I != E; ++I) { 8016 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 8017 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 8018 (this->*Callback)(CD); 8019 } 8020 } 8021 8022 /// Note that a constructor (or constructor template) was declared in Derived. 8023 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 8024 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 8025 } 8026 8027 /// Inherit a single constructor. 8028 void inherit(const CXXConstructorDecl *Ctor) { 8029 const FunctionProtoType *CtorType = 8030 Ctor->getType()->castAs<FunctionProtoType>(); 8031 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 8032 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 8033 8034 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 8035 8036 // Core issue (no number yet): the ellipsis is always discarded. 8037 if (EPI.Variadic) { 8038 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 8039 SemaRef.Diag(Ctor->getLocation(), 8040 diag::note_using_decl_constructor_ellipsis); 8041 EPI.Variadic = false; 8042 } 8043 8044 // Declare a constructor for each number of parameters. 8045 // 8046 // C++11 [class.inhctor]p1: 8047 // The candidate set of inherited constructors from the class X named in 8048 // the using-declaration consists of [... modulo defects ...] for each 8049 // constructor or constructor template of X, the set of constructors or 8050 // constructor templates that results from omitting any ellipsis parameter 8051 // specification and successively omitting parameters with a default 8052 // argument from the end of the parameter-type-list 8053 unsigned MinParams = minParamsToInherit(Ctor); 8054 unsigned Params = Ctor->getNumParams(); 8055 if (Params >= MinParams) { 8056 do 8057 declareCtor(UsingLoc, Ctor, 8058 SemaRef.Context.getFunctionType( 8059 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 8060 while (Params > MinParams && 8061 Ctor->getParamDecl(--Params)->hasDefaultArg()); 8062 } 8063 } 8064 8065 /// Find the using-declaration which specified that we should inherit the 8066 /// constructors of \p Base. 8067 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 8068 // No fancy lookup required; just look for the base constructor name 8069 // directly within the derived class. 8070 ASTContext &Context = SemaRef.Context; 8071 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8072 Context.getCanonicalType(Context.getRecordType(Base))); 8073 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8074 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8075 } 8076 8077 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8078 // C++11 [class.inhctor]p3: 8079 // [F]or each constructor template in the candidate set of inherited 8080 // constructors, a constructor template is implicitly declared 8081 if (Ctor->getDescribedFunctionTemplate()) 8082 return 0; 8083 8084 // For each non-template constructor in the candidate set of inherited 8085 // constructors other than a constructor having no parameters or a 8086 // copy/move constructor having a single parameter, a constructor is 8087 // implicitly declared [...] 8088 if (Ctor->getNumParams() == 0) 8089 return 1; 8090 if (Ctor->isCopyOrMoveConstructor()) 8091 return 2; 8092 8093 // Per discussion on core reflector, never inherit a constructor which 8094 // would become a default, copy, or move constructor of Derived either. 8095 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8096 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8097 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8098 } 8099 8100 /// Declare a single inheriting constructor, inheriting the specified 8101 /// constructor, with the given type. 8102 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8103 QualType DerivedType) { 8104 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8105 8106 // C++11 [class.inhctor]p3: 8107 // ... a constructor is implicitly declared with the same constructor 8108 // characteristics unless there is a user-declared constructor with 8109 // the same signature in the class where the using-declaration appears 8110 if (Entry.DeclaredInDerived) 8111 return; 8112 8113 // C++11 [class.inhctor]p7: 8114 // If two using-declarations declare inheriting constructors with the 8115 // same signature, the program is ill-formed 8116 if (Entry.DerivedCtor) { 8117 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8118 // Only diagnose this once per constructor. 8119 if (Entry.DerivedCtor->isInvalidDecl()) 8120 return; 8121 Entry.DerivedCtor->setInvalidDecl(); 8122 8123 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8124 SemaRef.Diag(BaseCtor->getLocation(), 8125 diag::note_using_decl_constructor_conflict_current_ctor); 8126 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8127 diag::note_using_decl_constructor_conflict_previous_ctor); 8128 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8129 diag::note_using_decl_constructor_conflict_previous_using); 8130 } else { 8131 // Core issue (no number): if the same inheriting constructor is 8132 // produced by multiple base class constructors from the same base 8133 // class, the inheriting constructor is defined as deleted. 8134 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8135 } 8136 8137 return; 8138 } 8139 8140 ASTContext &Context = SemaRef.Context; 8141 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8142 Context.getCanonicalType(Context.getRecordType(Derived))); 8143 DeclarationNameInfo NameInfo(Name, UsingLoc); 8144 8145 TemplateParameterList *TemplateParams = 0; 8146 if (const FunctionTemplateDecl *FTD = 8147 BaseCtor->getDescribedFunctionTemplate()) { 8148 TemplateParams = FTD->getTemplateParameters(); 8149 // We're reusing template parameters from a different DeclContext. This 8150 // is questionable at best, but works out because the template depth in 8151 // both places is guaranteed to be 0. 8152 // FIXME: Rebuild the template parameters in the new context, and 8153 // transform the function type to refer to them. 8154 } 8155 8156 // Build type source info pointing at the using-declaration. This is 8157 // required by template instantiation. 8158 TypeSourceInfo *TInfo = 8159 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8160 FunctionProtoTypeLoc ProtoLoc = 8161 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8162 8163 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8164 Context, Derived, UsingLoc, NameInfo, DerivedType, 8165 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8166 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8167 8168 // Build an unevaluated exception specification for this constructor. 8169 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8170 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8171 EPI.ExceptionSpecType = EST_Unevaluated; 8172 EPI.ExceptionSpecDecl = DerivedCtor; 8173 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8174 FPT->getArgTypes(), EPI)); 8175 8176 // Build the parameter declarations. 8177 SmallVector<ParmVarDecl *, 16> ParamDecls; 8178 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8179 TypeSourceInfo *TInfo = 8180 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8181 ParmVarDecl *PD = ParmVarDecl::Create( 8182 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8183 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8184 PD->setScopeInfo(0, I); 8185 PD->setImplicit(); 8186 ParamDecls.push_back(PD); 8187 ProtoLoc.setArg(I, PD); 8188 } 8189 8190 // Set up the new constructor. 8191 DerivedCtor->setAccess(BaseCtor->getAccess()); 8192 DerivedCtor->setParams(ParamDecls); 8193 DerivedCtor->setInheritedConstructor(BaseCtor); 8194 if (BaseCtor->isDeleted()) 8195 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8196 8197 // If this is a constructor template, build the template declaration. 8198 if (TemplateParams) { 8199 FunctionTemplateDecl *DerivedTemplate = 8200 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8201 TemplateParams, DerivedCtor); 8202 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8203 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8204 Derived->addDecl(DerivedTemplate); 8205 } else { 8206 Derived->addDecl(DerivedCtor); 8207 } 8208 8209 Entry.BaseCtor = BaseCtor; 8210 Entry.DerivedCtor = DerivedCtor; 8211 } 8212 8213 Sema &SemaRef; 8214 CXXRecordDecl *Derived; 8215 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8216 MapType Map; 8217}; 8218} 8219 8220void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8221 // Defer declaring the inheriting constructors until the class is 8222 // instantiated. 8223 if (ClassDecl->isDependentContext()) 8224 return; 8225 8226 // Find base classes from which we might inherit constructors. 8227 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8228 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8229 BaseE = ClassDecl->bases_end(); 8230 BaseIt != BaseE; ++BaseIt) 8231 if (BaseIt->getInheritConstructors()) 8232 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8233 8234 // Go no further if we're not inheriting any constructors. 8235 if (InheritedBases.empty()) 8236 return; 8237 8238 // Declare the inherited constructors. 8239 InheritingConstructorInfo ICI(*this, ClassDecl); 8240 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8241 ICI.inheritAll(InheritedBases[I]); 8242} 8243 8244void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8245 CXXConstructorDecl *Constructor) { 8246 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8247 assert(Constructor->getInheritedConstructor() && 8248 !Constructor->doesThisDeclarationHaveABody() && 8249 !Constructor->isDeleted()); 8250 8251 SynthesizedFunctionScope Scope(*this, Constructor); 8252 DiagnosticErrorTrap Trap(Diags); 8253 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8254 Trap.hasErrorOccurred()) { 8255 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8256 << Context.getTagDeclType(ClassDecl); 8257 Constructor->setInvalidDecl(); 8258 return; 8259 } 8260 8261 SourceLocation Loc = Constructor->getLocation(); 8262 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8263 8264 Constructor->setUsed(); 8265 MarkVTableUsed(CurrentLocation, ClassDecl); 8266 8267 if (ASTMutationListener *L = getASTMutationListener()) { 8268 L->CompletedImplicitDefinition(Constructor); 8269 } 8270} 8271 8272 8273Sema::ImplicitExceptionSpecification 8274Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8275 CXXRecordDecl *ClassDecl = MD->getParent(); 8276 8277 // C++ [except.spec]p14: 8278 // An implicitly declared special member function (Clause 12) shall have 8279 // an exception-specification. 8280 ImplicitExceptionSpecification ExceptSpec(*this); 8281 if (ClassDecl->isInvalidDecl()) 8282 return ExceptSpec; 8283 8284 // Direct base-class destructors. 8285 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8286 BEnd = ClassDecl->bases_end(); 8287 B != BEnd; ++B) { 8288 if (B->isVirtual()) // Handled below. 8289 continue; 8290 8291 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8292 ExceptSpec.CalledDecl(B->getLocStart(), 8293 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8294 } 8295 8296 // Virtual base-class destructors. 8297 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8298 BEnd = ClassDecl->vbases_end(); 8299 B != BEnd; ++B) { 8300 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8301 ExceptSpec.CalledDecl(B->getLocStart(), 8302 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8303 } 8304 8305 // Field destructors. 8306 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8307 FEnd = ClassDecl->field_end(); 8308 F != FEnd; ++F) { 8309 if (const RecordType *RecordTy 8310 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8311 ExceptSpec.CalledDecl(F->getLocation(), 8312 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8313 } 8314 8315 return ExceptSpec; 8316} 8317 8318CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8319 // C++ [class.dtor]p2: 8320 // If a class has no user-declared destructor, a destructor is 8321 // declared implicitly. An implicitly-declared destructor is an 8322 // inline public member of its class. 8323 assert(ClassDecl->needsImplicitDestructor()); 8324 8325 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8326 if (DSM.isAlreadyBeingDeclared()) 8327 return 0; 8328 8329 // Create the actual destructor declaration. 8330 CanQualType ClassType 8331 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8332 SourceLocation ClassLoc = ClassDecl->getLocation(); 8333 DeclarationName Name 8334 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8335 DeclarationNameInfo NameInfo(Name, ClassLoc); 8336 CXXDestructorDecl *Destructor 8337 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8338 QualType(), 0, /*isInline=*/true, 8339 /*isImplicitlyDeclared=*/true); 8340 Destructor->setAccess(AS_public); 8341 Destructor->setDefaulted(); 8342 Destructor->setImplicit(); 8343 8344 // Build an exception specification pointing back at this destructor. 8345 FunctionProtoType::ExtProtoInfo EPI; 8346 EPI.ExceptionSpecType = EST_Unevaluated; 8347 EPI.ExceptionSpecDecl = Destructor; 8348 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8349 8350 AddOverriddenMethods(ClassDecl, Destructor); 8351 8352 // We don't need to use SpecialMemberIsTrivial here; triviality for 8353 // destructors is easy to compute. 8354 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8355 8356 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8357 SetDeclDeleted(Destructor, ClassLoc); 8358 8359 // Note that we have declared this destructor. 8360 ++ASTContext::NumImplicitDestructorsDeclared; 8361 8362 // Introduce this destructor into its scope. 8363 if (Scope *S = getScopeForContext(ClassDecl)) 8364 PushOnScopeChains(Destructor, S, false); 8365 ClassDecl->addDecl(Destructor); 8366 8367 return Destructor; 8368} 8369 8370void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8371 CXXDestructorDecl *Destructor) { 8372 assert((Destructor->isDefaulted() && 8373 !Destructor->doesThisDeclarationHaveABody() && 8374 !Destructor->isDeleted()) && 8375 "DefineImplicitDestructor - call it for implicit default dtor"); 8376 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8377 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8378 8379 if (Destructor->isInvalidDecl()) 8380 return; 8381 8382 SynthesizedFunctionScope Scope(*this, Destructor); 8383 8384 DiagnosticErrorTrap Trap(Diags); 8385 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8386 Destructor->getParent()); 8387 8388 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8389 Diag(CurrentLocation, diag::note_member_synthesized_at) 8390 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8391 8392 Destructor->setInvalidDecl(); 8393 return; 8394 } 8395 8396 SourceLocation Loc = Destructor->getLocation(); 8397 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8398 Destructor->setImplicitlyDefined(true); 8399 Destructor->setUsed(); 8400 MarkVTableUsed(CurrentLocation, ClassDecl); 8401 8402 if (ASTMutationListener *L = getASTMutationListener()) { 8403 L->CompletedImplicitDefinition(Destructor); 8404 } 8405} 8406 8407/// \brief Perform any semantic analysis which needs to be delayed until all 8408/// pending class member declarations have been parsed. 8409void Sema::ActOnFinishCXXMemberDecls() { 8410 // If the context is an invalid C++ class, just suppress these checks. 8411 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8412 if (Record->isInvalidDecl()) { 8413 DelayedDestructorExceptionSpecChecks.clear(); 8414 return; 8415 } 8416 } 8417 8418 // Perform any deferred checking of exception specifications for virtual 8419 // destructors. 8420 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8421 i != e; ++i) { 8422 const CXXDestructorDecl *Dtor = 8423 DelayedDestructorExceptionSpecChecks[i].first; 8424 assert(!Dtor->getParent()->isDependentType() && 8425 "Should not ever add destructors of templates into the list."); 8426 CheckOverridingFunctionExceptionSpec(Dtor, 8427 DelayedDestructorExceptionSpecChecks[i].second); 8428 } 8429 DelayedDestructorExceptionSpecChecks.clear(); 8430} 8431 8432void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8433 CXXDestructorDecl *Destructor) { 8434 assert(getLangOpts().CPlusPlus11 && 8435 "adjusting dtor exception specs was introduced in c++11"); 8436 8437 // C++11 [class.dtor]p3: 8438 // A declaration of a destructor that does not have an exception- 8439 // specification is implicitly considered to have the same exception- 8440 // specification as an implicit declaration. 8441 const FunctionProtoType *DtorType = Destructor->getType()-> 8442 getAs<FunctionProtoType>(); 8443 if (DtorType->hasExceptionSpec()) 8444 return; 8445 8446 // Replace the destructor's type, building off the existing one. Fortunately, 8447 // the only thing of interest in the destructor type is its extended info. 8448 // The return and arguments are fixed. 8449 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8450 EPI.ExceptionSpecType = EST_Unevaluated; 8451 EPI.ExceptionSpecDecl = Destructor; 8452 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8453 8454 // FIXME: If the destructor has a body that could throw, and the newly created 8455 // spec doesn't allow exceptions, we should emit a warning, because this 8456 // change in behavior can break conforming C++03 programs at runtime. 8457 // However, we don't have a body or an exception specification yet, so it 8458 // needs to be done somewhere else. 8459} 8460 8461/// When generating a defaulted copy or move assignment operator, if a field 8462/// should be copied with __builtin_memcpy rather than via explicit assignments, 8463/// do so. This optimization only applies for arrays of scalars, and for arrays 8464/// of class type where the selected copy/move-assignment operator is trivial. 8465static StmtResult 8466buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8467 Expr *To, Expr *From) { 8468 // Compute the size of the memory buffer to be copied. 8469 QualType SizeType = S.Context.getSizeType(); 8470 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8471 S.Context.getTypeSizeInChars(T).getQuantity()); 8472 8473 // Take the address of the field references for "from" and "to". We 8474 // directly construct UnaryOperators here because semantic analysis 8475 // does not permit us to take the address of an xvalue. 8476 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8477 S.Context.getPointerType(From->getType()), 8478 VK_RValue, OK_Ordinary, Loc); 8479 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8480 S.Context.getPointerType(To->getType()), 8481 VK_RValue, OK_Ordinary, Loc); 8482 8483 const Type *E = T->getBaseElementTypeUnsafe(); 8484 bool NeedsCollectableMemCpy = 8485 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8486 8487 // Create a reference to the __builtin_objc_memmove_collectable function 8488 StringRef MemCpyName = NeedsCollectableMemCpy ? 8489 "__builtin_objc_memmove_collectable" : 8490 "__builtin_memcpy"; 8491 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8492 Sema::LookupOrdinaryName); 8493 S.LookupName(R, S.TUScope, true); 8494 8495 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8496 if (!MemCpy) 8497 // Something went horribly wrong earlier, and we will have complained 8498 // about it. 8499 return StmtError(); 8500 8501 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8502 VK_RValue, Loc, 0); 8503 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8504 8505 Expr *CallArgs[] = { 8506 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8507 }; 8508 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8509 Loc, CallArgs, Loc); 8510 8511 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8512 return S.Owned(Call.takeAs<Stmt>()); 8513} 8514 8515/// \brief Builds a statement that copies/moves the given entity from \p From to 8516/// \c To. 8517/// 8518/// This routine is used to copy/move the members of a class with an 8519/// implicitly-declared copy/move assignment operator. When the entities being 8520/// copied are arrays, this routine builds for loops to copy them. 8521/// 8522/// \param S The Sema object used for type-checking. 8523/// 8524/// \param Loc The location where the implicit copy/move is being generated. 8525/// 8526/// \param T The type of the expressions being copied/moved. Both expressions 8527/// must have this type. 8528/// 8529/// \param To The expression we are copying/moving to. 8530/// 8531/// \param From The expression we are copying/moving from. 8532/// 8533/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8534/// Otherwise, it's a non-static member subobject. 8535/// 8536/// \param Copying Whether we're copying or moving. 8537/// 8538/// \param Depth Internal parameter recording the depth of the recursion. 8539/// 8540/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8541/// if a memcpy should be used instead. 8542static StmtResult 8543buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8544 Expr *To, Expr *From, 8545 bool CopyingBaseSubobject, bool Copying, 8546 unsigned Depth = 0) { 8547 // C++11 [class.copy]p28: 8548 // Each subobject is assigned in the manner appropriate to its type: 8549 // 8550 // - if the subobject is of class type, as if by a call to operator= with 8551 // the subobject as the object expression and the corresponding 8552 // subobject of x as a single function argument (as if by explicit 8553 // qualification; that is, ignoring any possible virtual overriding 8554 // functions in more derived classes); 8555 // 8556 // C++03 [class.copy]p13: 8557 // - if the subobject is of class type, the copy assignment operator for 8558 // the class is used (as if by explicit qualification; that is, 8559 // ignoring any possible virtual overriding functions in more derived 8560 // classes); 8561 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8562 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8563 8564 // Look for operator=. 8565 DeclarationName Name 8566 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8567 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8568 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8569 8570 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8571 // operator. 8572 if (!S.getLangOpts().CPlusPlus11) { 8573 LookupResult::Filter F = OpLookup.makeFilter(); 8574 while (F.hasNext()) { 8575 NamedDecl *D = F.next(); 8576 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8577 if (Method->isCopyAssignmentOperator() || 8578 (!Copying && Method->isMoveAssignmentOperator())) 8579 continue; 8580 8581 F.erase(); 8582 } 8583 F.done(); 8584 } 8585 8586 // Suppress the protected check (C++ [class.protected]) for each of the 8587 // assignment operators we found. This strange dance is required when 8588 // we're assigning via a base classes's copy-assignment operator. To 8589 // ensure that we're getting the right base class subobject (without 8590 // ambiguities), we need to cast "this" to that subobject type; to 8591 // ensure that we don't go through the virtual call mechanism, we need 8592 // to qualify the operator= name with the base class (see below). However, 8593 // this means that if the base class has a protected copy assignment 8594 // operator, the protected member access check will fail. So, we 8595 // rewrite "protected" access to "public" access in this case, since we 8596 // know by construction that we're calling from a derived class. 8597 if (CopyingBaseSubobject) { 8598 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8599 L != LEnd; ++L) { 8600 if (L.getAccess() == AS_protected) 8601 L.setAccess(AS_public); 8602 } 8603 } 8604 8605 // Create the nested-name-specifier that will be used to qualify the 8606 // reference to operator=; this is required to suppress the virtual 8607 // call mechanism. 8608 CXXScopeSpec SS; 8609 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8610 SS.MakeTrivial(S.Context, 8611 NestedNameSpecifier::Create(S.Context, 0, false, 8612 CanonicalT), 8613 Loc); 8614 8615 // Create the reference to operator=. 8616 ExprResult OpEqualRef 8617 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8618 /*TemplateKWLoc=*/SourceLocation(), 8619 /*FirstQualifierInScope=*/0, 8620 OpLookup, 8621 /*TemplateArgs=*/0, 8622 /*SuppressQualifierCheck=*/true); 8623 if (OpEqualRef.isInvalid()) 8624 return StmtError(); 8625 8626 // Build the call to the assignment operator. 8627 8628 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8629 OpEqualRef.takeAs<Expr>(), 8630 Loc, From, Loc); 8631 if (Call.isInvalid()) 8632 return StmtError(); 8633 8634 // If we built a call to a trivial 'operator=' while copying an array, 8635 // bail out. We'll replace the whole shebang with a memcpy. 8636 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8637 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8638 return StmtResult((Stmt*)0); 8639 8640 // Convert to an expression-statement, and clean up any produced 8641 // temporaries. 8642 return S.ActOnExprStmt(Call); 8643 } 8644 8645 // - if the subobject is of scalar type, the built-in assignment 8646 // operator is used. 8647 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8648 if (!ArrayTy) { 8649 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8650 if (Assignment.isInvalid()) 8651 return StmtError(); 8652 return S.ActOnExprStmt(Assignment); 8653 } 8654 8655 // - if the subobject is an array, each element is assigned, in the 8656 // manner appropriate to the element type; 8657 8658 // Construct a loop over the array bounds, e.g., 8659 // 8660 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8661 // 8662 // that will copy each of the array elements. 8663 QualType SizeType = S.Context.getSizeType(); 8664 8665 // Create the iteration variable. 8666 IdentifierInfo *IterationVarName = 0; 8667 { 8668 SmallString<8> Str; 8669 llvm::raw_svector_ostream OS(Str); 8670 OS << "__i" << Depth; 8671 IterationVarName = &S.Context.Idents.get(OS.str()); 8672 } 8673 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8674 IterationVarName, SizeType, 8675 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8676 SC_None); 8677 8678 // Initialize the iteration variable to zero. 8679 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8680 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8681 8682 // Create a reference to the iteration variable; we'll use this several 8683 // times throughout. 8684 Expr *IterationVarRef 8685 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8686 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8687 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8688 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8689 8690 // Create the DeclStmt that holds the iteration variable. 8691 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8692 8693 // Subscript the "from" and "to" expressions with the iteration variable. 8694 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8695 IterationVarRefRVal, 8696 Loc)); 8697 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8698 IterationVarRefRVal, 8699 Loc)); 8700 if (!Copying) // Cast to rvalue 8701 From = CastForMoving(S, From); 8702 8703 // Build the copy/move for an individual element of the array. 8704 StmtResult Copy = 8705 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8706 To, From, CopyingBaseSubobject, 8707 Copying, Depth + 1); 8708 // Bail out if copying fails or if we determined that we should use memcpy. 8709 if (Copy.isInvalid() || !Copy.get()) 8710 return Copy; 8711 8712 // Create the comparison against the array bound. 8713 llvm::APInt Upper 8714 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8715 Expr *Comparison 8716 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8717 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8718 BO_NE, S.Context.BoolTy, 8719 VK_RValue, OK_Ordinary, Loc, false); 8720 8721 // Create the pre-increment of the iteration variable. 8722 Expr *Increment 8723 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8724 VK_LValue, OK_Ordinary, Loc); 8725 8726 // Construct the loop that copies all elements of this array. 8727 return S.ActOnForStmt(Loc, Loc, InitStmt, 8728 S.MakeFullExpr(Comparison), 8729 0, S.MakeFullDiscardedValueExpr(Increment), 8730 Loc, Copy.take()); 8731} 8732 8733static StmtResult 8734buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8735 Expr *To, Expr *From, 8736 bool CopyingBaseSubobject, bool Copying) { 8737 // Maybe we should use a memcpy? 8738 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8739 T.isTriviallyCopyableType(S.Context)) 8740 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8741 8742 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8743 CopyingBaseSubobject, 8744 Copying, 0)); 8745 8746 // If we ended up picking a trivial assignment operator for an array of a 8747 // non-trivially-copyable class type, just emit a memcpy. 8748 if (!Result.isInvalid() && !Result.get()) 8749 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8750 8751 return Result; 8752} 8753 8754Sema::ImplicitExceptionSpecification 8755Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8756 CXXRecordDecl *ClassDecl = MD->getParent(); 8757 8758 ImplicitExceptionSpecification ExceptSpec(*this); 8759 if (ClassDecl->isInvalidDecl()) 8760 return ExceptSpec; 8761 8762 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8763 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8764 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8765 8766 // C++ [except.spec]p14: 8767 // An implicitly declared special member function (Clause 12) shall have an 8768 // exception-specification. [...] 8769 8770 // It is unspecified whether or not an implicit copy assignment operator 8771 // attempts to deduplicate calls to assignment operators of virtual bases are 8772 // made. As such, this exception specification is effectively unspecified. 8773 // Based on a similar decision made for constness in C++0x, we're erring on 8774 // the side of assuming such calls to be made regardless of whether they 8775 // actually happen. 8776 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8777 BaseEnd = ClassDecl->bases_end(); 8778 Base != BaseEnd; ++Base) { 8779 if (Base->isVirtual()) 8780 continue; 8781 8782 CXXRecordDecl *BaseClassDecl 8783 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8784 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8785 ArgQuals, false, 0)) 8786 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8787 } 8788 8789 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8790 BaseEnd = ClassDecl->vbases_end(); 8791 Base != BaseEnd; ++Base) { 8792 CXXRecordDecl *BaseClassDecl 8793 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8794 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8795 ArgQuals, false, 0)) 8796 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8797 } 8798 8799 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8800 FieldEnd = ClassDecl->field_end(); 8801 Field != FieldEnd; 8802 ++Field) { 8803 QualType FieldType = Context.getBaseElementType(Field->getType()); 8804 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8805 if (CXXMethodDecl *CopyAssign = 8806 LookupCopyingAssignment(FieldClassDecl, 8807 ArgQuals | FieldType.getCVRQualifiers(), 8808 false, 0)) 8809 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8810 } 8811 } 8812 8813 return ExceptSpec; 8814} 8815 8816CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8817 // Note: The following rules are largely analoguous to the copy 8818 // constructor rules. Note that virtual bases are not taken into account 8819 // for determining the argument type of the operator. Note also that 8820 // operators taking an object instead of a reference are allowed. 8821 assert(ClassDecl->needsImplicitCopyAssignment()); 8822 8823 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8824 if (DSM.isAlreadyBeingDeclared()) 8825 return 0; 8826 8827 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8828 QualType RetType = Context.getLValueReferenceType(ArgType); 8829 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 8830 if (Const) 8831 ArgType = ArgType.withConst(); 8832 ArgType = Context.getLValueReferenceType(ArgType); 8833 8834 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8835 CXXCopyAssignment, 8836 Const); 8837 8838 // An implicitly-declared copy assignment operator is an inline public 8839 // member of its class. 8840 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8841 SourceLocation ClassLoc = ClassDecl->getLocation(); 8842 DeclarationNameInfo NameInfo(Name, ClassLoc); 8843 CXXMethodDecl *CopyAssignment = 8844 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8845 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 8846 /*isInline=*/ true, Constexpr, SourceLocation()); 8847 CopyAssignment->setAccess(AS_public); 8848 CopyAssignment->setDefaulted(); 8849 CopyAssignment->setImplicit(); 8850 8851 // Build an exception specification pointing back at this member. 8852 FunctionProtoType::ExtProtoInfo EPI; 8853 EPI.ExceptionSpecType = EST_Unevaluated; 8854 EPI.ExceptionSpecDecl = CopyAssignment; 8855 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8856 8857 // Add the parameter to the operator. 8858 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8859 ClassLoc, ClassLoc, /*Id=*/0, 8860 ArgType, /*TInfo=*/0, 8861 SC_None, 0); 8862 CopyAssignment->setParams(FromParam); 8863 8864 AddOverriddenMethods(ClassDecl, CopyAssignment); 8865 8866 CopyAssignment->setTrivial( 8867 ClassDecl->needsOverloadResolutionForCopyAssignment() 8868 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8869 : ClassDecl->hasTrivialCopyAssignment()); 8870 8871 // C++11 [class.copy]p19: 8872 // .... If the class definition does not explicitly declare a copy 8873 // assignment operator, there is no user-declared move constructor, and 8874 // there is no user-declared move assignment operator, a copy assignment 8875 // operator is implicitly declared as defaulted. 8876 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8877 SetDeclDeleted(CopyAssignment, ClassLoc); 8878 8879 // Note that we have added this copy-assignment operator. 8880 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8881 8882 if (Scope *S = getScopeForContext(ClassDecl)) 8883 PushOnScopeChains(CopyAssignment, S, false); 8884 ClassDecl->addDecl(CopyAssignment); 8885 8886 return CopyAssignment; 8887} 8888 8889/// Diagnose an implicit copy operation for a class which is odr-used, but 8890/// which is deprecated because the class has a user-declared copy constructor, 8891/// copy assignment operator, or destructor. 8892static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 8893 SourceLocation UseLoc) { 8894 assert(CopyOp->isImplicit()); 8895 8896 CXXRecordDecl *RD = CopyOp->getParent(); 8897 CXXMethodDecl *UserDeclaredOperation = 0; 8898 8899 // In Microsoft mode, assignment operations don't affect constructors and 8900 // vice versa. 8901 if (RD->hasUserDeclaredDestructor()) { 8902 UserDeclaredOperation = RD->getDestructor(); 8903 } else if (!isa<CXXConstructorDecl>(CopyOp) && 8904 RD->hasUserDeclaredCopyConstructor() && 8905 !S.getLangOpts().MicrosoftMode) { 8906 // Find any user-declared copy constructor. 8907 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 8908 E = RD->ctor_end(); I != E; ++I) { 8909 if (I->isCopyConstructor()) { 8910 UserDeclaredOperation = *I; 8911 break; 8912 } 8913 } 8914 assert(UserDeclaredOperation); 8915 } else if (isa<CXXConstructorDecl>(CopyOp) && 8916 RD->hasUserDeclaredCopyAssignment() && 8917 !S.getLangOpts().MicrosoftMode) { 8918 // Find any user-declared move assignment operator. 8919 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 8920 E = RD->method_end(); I != E; ++I) { 8921 if (I->isCopyAssignmentOperator()) { 8922 UserDeclaredOperation = *I; 8923 break; 8924 } 8925 } 8926 assert(UserDeclaredOperation); 8927 } 8928 8929 if (UserDeclaredOperation) { 8930 S.Diag(UserDeclaredOperation->getLocation(), 8931 diag::warn_deprecated_copy_operation) 8932 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 8933 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 8934 S.Diag(UseLoc, diag::note_member_synthesized_at) 8935 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 8936 : Sema::CXXCopyAssignment) 8937 << RD; 8938 } 8939} 8940 8941void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8942 CXXMethodDecl *CopyAssignOperator) { 8943 assert((CopyAssignOperator->isDefaulted() && 8944 CopyAssignOperator->isOverloadedOperator() && 8945 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8946 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8947 !CopyAssignOperator->isDeleted()) && 8948 "DefineImplicitCopyAssignment called for wrong function"); 8949 8950 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8951 8952 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8953 CopyAssignOperator->setInvalidDecl(); 8954 return; 8955 } 8956 8957 // C++11 [class.copy]p18: 8958 // The [definition of an implicitly declared copy assignment operator] is 8959 // deprecated if the class has a user-declared copy constructor or a 8960 // user-declared destructor. 8961 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 8962 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 8963 8964 CopyAssignOperator->setUsed(); 8965 8966 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8967 DiagnosticErrorTrap Trap(Diags); 8968 8969 // C++0x [class.copy]p30: 8970 // The implicitly-defined or explicitly-defaulted copy assignment operator 8971 // for a non-union class X performs memberwise copy assignment of its 8972 // subobjects. The direct base classes of X are assigned first, in the 8973 // order of their declaration in the base-specifier-list, and then the 8974 // immediate non-static data members of X are assigned, in the order in 8975 // which they were declared in the class definition. 8976 8977 // The statements that form the synthesized function body. 8978 SmallVector<Stmt*, 8> Statements; 8979 8980 // The parameter for the "other" object, which we are copying from. 8981 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8982 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8983 QualType OtherRefType = Other->getType(); 8984 if (const LValueReferenceType *OtherRef 8985 = OtherRefType->getAs<LValueReferenceType>()) { 8986 OtherRefType = OtherRef->getPointeeType(); 8987 OtherQuals = OtherRefType.getQualifiers(); 8988 } 8989 8990 // Our location for everything implicitly-generated. 8991 SourceLocation Loc = CopyAssignOperator->getLocation(); 8992 8993 // Construct a reference to the "other" object. We'll be using this 8994 // throughout the generated ASTs. 8995 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8996 assert(OtherRef && "Reference to parameter cannot fail!"); 8997 8998 // Construct the "this" pointer. We'll be using this throughout the generated 8999 // ASTs. 9000 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9001 assert(This && "Reference to this cannot fail!"); 9002 9003 // Assign base classes. 9004 bool Invalid = false; 9005 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9006 E = ClassDecl->bases_end(); Base != E; ++Base) { 9007 // Form the assignment: 9008 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 9009 QualType BaseType = Base->getType().getUnqualifiedType(); 9010 if (!BaseType->isRecordType()) { 9011 Invalid = true; 9012 continue; 9013 } 9014 9015 CXXCastPath BasePath; 9016 BasePath.push_back(Base); 9017 9018 // Construct the "from" expression, which is an implicit cast to the 9019 // appropriately-qualified base type. 9020 Expr *From = OtherRef; 9021 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 9022 CK_UncheckedDerivedToBase, 9023 VK_LValue, &BasePath).take(); 9024 9025 // Dereference "this". 9026 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9027 9028 // Implicitly cast "this" to the appropriately-qualified base type. 9029 To = ImpCastExprToType(To.take(), 9030 Context.getCVRQualifiedType(BaseType, 9031 CopyAssignOperator->getTypeQualifiers()), 9032 CK_UncheckedDerivedToBase, 9033 VK_LValue, &BasePath); 9034 9035 // Build the copy. 9036 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 9037 To.get(), From, 9038 /*CopyingBaseSubobject=*/true, 9039 /*Copying=*/true); 9040 if (Copy.isInvalid()) { 9041 Diag(CurrentLocation, diag::note_member_synthesized_at) 9042 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9043 CopyAssignOperator->setInvalidDecl(); 9044 return; 9045 } 9046 9047 // Success! Record the copy. 9048 Statements.push_back(Copy.takeAs<Expr>()); 9049 } 9050 9051 // Assign non-static members. 9052 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9053 FieldEnd = ClassDecl->field_end(); 9054 Field != FieldEnd; ++Field) { 9055 if (Field->isUnnamedBitfield()) 9056 continue; 9057 9058 if (Field->isInvalidDecl()) { 9059 Invalid = true; 9060 continue; 9061 } 9062 9063 // Check for members of reference type; we can't copy those. 9064 if (Field->getType()->isReferenceType()) { 9065 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9066 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9067 Diag(Field->getLocation(), diag::note_declared_at); 9068 Diag(CurrentLocation, diag::note_member_synthesized_at) 9069 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9070 Invalid = true; 9071 continue; 9072 } 9073 9074 // Check for members of const-qualified, non-class type. 9075 QualType BaseType = Context.getBaseElementType(Field->getType()); 9076 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9077 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9078 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9079 Diag(Field->getLocation(), diag::note_declared_at); 9080 Diag(CurrentLocation, diag::note_member_synthesized_at) 9081 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9082 Invalid = true; 9083 continue; 9084 } 9085 9086 // Suppress assigning zero-width bitfields. 9087 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9088 continue; 9089 9090 QualType FieldType = Field->getType().getNonReferenceType(); 9091 if (FieldType->isIncompleteArrayType()) { 9092 assert(ClassDecl->hasFlexibleArrayMember() && 9093 "Incomplete array type is not valid"); 9094 continue; 9095 } 9096 9097 // Build references to the field in the object we're copying from and to. 9098 CXXScopeSpec SS; // Intentionally empty 9099 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9100 LookupMemberName); 9101 MemberLookup.addDecl(*Field); 9102 MemberLookup.resolveKind(); 9103 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9104 Loc, /*IsArrow=*/false, 9105 SS, SourceLocation(), 0, 9106 MemberLookup, 0); 9107 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9108 Loc, /*IsArrow=*/true, 9109 SS, SourceLocation(), 0, 9110 MemberLookup, 0); 9111 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9112 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9113 9114 // Build the copy of this field. 9115 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9116 To.get(), From.get(), 9117 /*CopyingBaseSubobject=*/false, 9118 /*Copying=*/true); 9119 if (Copy.isInvalid()) { 9120 Diag(CurrentLocation, diag::note_member_synthesized_at) 9121 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9122 CopyAssignOperator->setInvalidDecl(); 9123 return; 9124 } 9125 9126 // Success! Record the copy. 9127 Statements.push_back(Copy.takeAs<Stmt>()); 9128 } 9129 9130 if (!Invalid) { 9131 // Add a "return *this;" 9132 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9133 9134 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9135 if (Return.isInvalid()) 9136 Invalid = true; 9137 else { 9138 Statements.push_back(Return.takeAs<Stmt>()); 9139 9140 if (Trap.hasErrorOccurred()) { 9141 Diag(CurrentLocation, diag::note_member_synthesized_at) 9142 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9143 Invalid = true; 9144 } 9145 } 9146 } 9147 9148 if (Invalid) { 9149 CopyAssignOperator->setInvalidDecl(); 9150 return; 9151 } 9152 9153 StmtResult Body; 9154 { 9155 CompoundScopeRAII CompoundScope(*this); 9156 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9157 /*isStmtExpr=*/false); 9158 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9159 } 9160 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9161 9162 if (ASTMutationListener *L = getASTMutationListener()) { 9163 L->CompletedImplicitDefinition(CopyAssignOperator); 9164 } 9165} 9166 9167Sema::ImplicitExceptionSpecification 9168Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9169 CXXRecordDecl *ClassDecl = MD->getParent(); 9170 9171 ImplicitExceptionSpecification ExceptSpec(*this); 9172 if (ClassDecl->isInvalidDecl()) 9173 return ExceptSpec; 9174 9175 // C++0x [except.spec]p14: 9176 // An implicitly declared special member function (Clause 12) shall have an 9177 // exception-specification. [...] 9178 9179 // It is unspecified whether or not an implicit move assignment operator 9180 // attempts to deduplicate calls to assignment operators of virtual bases are 9181 // made. As such, this exception specification is effectively unspecified. 9182 // Based on a similar decision made for constness in C++0x, we're erring on 9183 // the side of assuming such calls to be made regardless of whether they 9184 // actually happen. 9185 // Note that a move constructor is not implicitly declared when there are 9186 // virtual bases, but it can still be user-declared and explicitly defaulted. 9187 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9188 BaseEnd = ClassDecl->bases_end(); 9189 Base != BaseEnd; ++Base) { 9190 if (Base->isVirtual()) 9191 continue; 9192 9193 CXXRecordDecl *BaseClassDecl 9194 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9195 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9196 0, false, 0)) 9197 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9198 } 9199 9200 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9201 BaseEnd = ClassDecl->vbases_end(); 9202 Base != BaseEnd; ++Base) { 9203 CXXRecordDecl *BaseClassDecl 9204 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9205 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9206 0, false, 0)) 9207 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9208 } 9209 9210 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9211 FieldEnd = ClassDecl->field_end(); 9212 Field != FieldEnd; 9213 ++Field) { 9214 QualType FieldType = Context.getBaseElementType(Field->getType()); 9215 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9216 if (CXXMethodDecl *MoveAssign = 9217 LookupMovingAssignment(FieldClassDecl, 9218 FieldType.getCVRQualifiers(), 9219 false, 0)) 9220 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9221 } 9222 } 9223 9224 return ExceptSpec; 9225} 9226 9227/// Determine whether the class type has any direct or indirect virtual base 9228/// classes which have a non-trivial move assignment operator. 9229static bool 9230hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9231 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9232 BaseEnd = ClassDecl->vbases_end(); 9233 Base != BaseEnd; ++Base) { 9234 CXXRecordDecl *BaseClass = 9235 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9236 9237 // Try to declare the move assignment. If it would be deleted, then the 9238 // class does not have a non-trivial move assignment. 9239 if (BaseClass->needsImplicitMoveAssignment()) 9240 S.DeclareImplicitMoveAssignment(BaseClass); 9241 9242 if (BaseClass->hasNonTrivialMoveAssignment()) 9243 return true; 9244 } 9245 9246 return false; 9247} 9248 9249/// Determine whether the given type either has a move constructor or is 9250/// trivially copyable. 9251static bool 9252hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9253 Type = S.Context.getBaseElementType(Type); 9254 9255 // FIXME: Technically, non-trivially-copyable non-class types, such as 9256 // reference types, are supposed to return false here, but that appears 9257 // to be a standard defect. 9258 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9259 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9260 return true; 9261 9262 if (Type.isTriviallyCopyableType(S.Context)) 9263 return true; 9264 9265 if (IsConstructor) { 9266 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9267 // give the right answer. 9268 if (ClassDecl->needsImplicitMoveConstructor()) 9269 S.DeclareImplicitMoveConstructor(ClassDecl); 9270 return ClassDecl->hasMoveConstructor(); 9271 } 9272 9273 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9274 // give the right answer. 9275 if (ClassDecl->needsImplicitMoveAssignment()) 9276 S.DeclareImplicitMoveAssignment(ClassDecl); 9277 return ClassDecl->hasMoveAssignment(); 9278} 9279 9280/// Determine whether all non-static data members and direct or virtual bases 9281/// of class \p ClassDecl have either a move operation, or are trivially 9282/// copyable. 9283static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9284 bool IsConstructor) { 9285 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9286 BaseEnd = ClassDecl->bases_end(); 9287 Base != BaseEnd; ++Base) { 9288 if (Base->isVirtual()) 9289 continue; 9290 9291 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9292 return false; 9293 } 9294 9295 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9296 BaseEnd = ClassDecl->vbases_end(); 9297 Base != BaseEnd; ++Base) { 9298 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9299 return false; 9300 } 9301 9302 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9303 FieldEnd = ClassDecl->field_end(); 9304 Field != FieldEnd; ++Field) { 9305 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9306 return false; 9307 } 9308 9309 return true; 9310} 9311 9312CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9313 // C++11 [class.copy]p20: 9314 // If the definition of a class X does not explicitly declare a move 9315 // assignment operator, one will be implicitly declared as defaulted 9316 // if and only if: 9317 // 9318 // - [first 4 bullets] 9319 assert(ClassDecl->needsImplicitMoveAssignment()); 9320 9321 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9322 if (DSM.isAlreadyBeingDeclared()) 9323 return 0; 9324 9325 // [Checked after we build the declaration] 9326 // - the move assignment operator would not be implicitly defined as 9327 // deleted, 9328 9329 // [DR1402]: 9330 // - X has no direct or indirect virtual base class with a non-trivial 9331 // move assignment operator, and 9332 // - each of X's non-static data members and direct or virtual base classes 9333 // has a type that either has a move assignment operator or is trivially 9334 // copyable. 9335 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9336 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9337 ClassDecl->setFailedImplicitMoveAssignment(); 9338 return 0; 9339 } 9340 9341 // Note: The following rules are largely analoguous to the move 9342 // constructor rules. 9343 9344 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9345 QualType RetType = Context.getLValueReferenceType(ArgType); 9346 ArgType = Context.getRValueReferenceType(ArgType); 9347 9348 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9349 CXXMoveAssignment, 9350 false); 9351 9352 // An implicitly-declared move assignment operator is an inline public 9353 // member of its class. 9354 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9355 SourceLocation ClassLoc = ClassDecl->getLocation(); 9356 DeclarationNameInfo NameInfo(Name, ClassLoc); 9357 CXXMethodDecl *MoveAssignment = 9358 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9359 /*TInfo=*/0, /*StorageClass=*/SC_None, 9360 /*isInline=*/true, Constexpr, SourceLocation()); 9361 MoveAssignment->setAccess(AS_public); 9362 MoveAssignment->setDefaulted(); 9363 MoveAssignment->setImplicit(); 9364 9365 // Build an exception specification pointing back at this member. 9366 FunctionProtoType::ExtProtoInfo EPI; 9367 EPI.ExceptionSpecType = EST_Unevaluated; 9368 EPI.ExceptionSpecDecl = MoveAssignment; 9369 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9370 9371 // Add the parameter to the operator. 9372 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9373 ClassLoc, ClassLoc, /*Id=*/0, 9374 ArgType, /*TInfo=*/0, 9375 SC_None, 0); 9376 MoveAssignment->setParams(FromParam); 9377 9378 AddOverriddenMethods(ClassDecl, MoveAssignment); 9379 9380 MoveAssignment->setTrivial( 9381 ClassDecl->needsOverloadResolutionForMoveAssignment() 9382 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9383 : ClassDecl->hasTrivialMoveAssignment()); 9384 9385 // C++0x [class.copy]p9: 9386 // If the definition of a class X does not explicitly declare a move 9387 // assignment operator, one will be implicitly declared as defaulted if and 9388 // only if: 9389 // [...] 9390 // - the move assignment operator would not be implicitly defined as 9391 // deleted. 9392 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9393 // Cache this result so that we don't try to generate this over and over 9394 // on every lookup, leaking memory and wasting time. 9395 ClassDecl->setFailedImplicitMoveAssignment(); 9396 return 0; 9397 } 9398 9399 // Note that we have added this copy-assignment operator. 9400 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9401 9402 if (Scope *S = getScopeForContext(ClassDecl)) 9403 PushOnScopeChains(MoveAssignment, S, false); 9404 ClassDecl->addDecl(MoveAssignment); 9405 9406 return MoveAssignment; 9407} 9408 9409void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9410 CXXMethodDecl *MoveAssignOperator) { 9411 assert((MoveAssignOperator->isDefaulted() && 9412 MoveAssignOperator->isOverloadedOperator() && 9413 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9414 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9415 !MoveAssignOperator->isDeleted()) && 9416 "DefineImplicitMoveAssignment called for wrong function"); 9417 9418 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9419 9420 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9421 MoveAssignOperator->setInvalidDecl(); 9422 return; 9423 } 9424 9425 MoveAssignOperator->setUsed(); 9426 9427 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9428 DiagnosticErrorTrap Trap(Diags); 9429 9430 // C++0x [class.copy]p28: 9431 // The implicitly-defined or move assignment operator for a non-union class 9432 // X performs memberwise move assignment of its subobjects. The direct base 9433 // classes of X are assigned first, in the order of their declaration in the 9434 // base-specifier-list, and then the immediate non-static data members of X 9435 // are assigned, in the order in which they were declared in the class 9436 // definition. 9437 9438 // The statements that form the synthesized function body. 9439 SmallVector<Stmt*, 8> Statements; 9440 9441 // The parameter for the "other" object, which we are move from. 9442 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9443 QualType OtherRefType = Other->getType()-> 9444 getAs<RValueReferenceType>()->getPointeeType(); 9445 assert(!OtherRefType.getQualifiers() && 9446 "Bad argument type of defaulted move assignment"); 9447 9448 // Our location for everything implicitly-generated. 9449 SourceLocation Loc = MoveAssignOperator->getLocation(); 9450 9451 // Construct a reference to the "other" object. We'll be using this 9452 // throughout the generated ASTs. 9453 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9454 assert(OtherRef && "Reference to parameter cannot fail!"); 9455 // Cast to rvalue. 9456 OtherRef = CastForMoving(*this, OtherRef); 9457 9458 // Construct the "this" pointer. We'll be using this throughout the generated 9459 // ASTs. 9460 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9461 assert(This && "Reference to this cannot fail!"); 9462 9463 // Assign base classes. 9464 bool Invalid = false; 9465 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9466 E = ClassDecl->bases_end(); Base != E; ++Base) { 9467 // Form the assignment: 9468 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9469 QualType BaseType = Base->getType().getUnqualifiedType(); 9470 if (!BaseType->isRecordType()) { 9471 Invalid = true; 9472 continue; 9473 } 9474 9475 CXXCastPath BasePath; 9476 BasePath.push_back(Base); 9477 9478 // Construct the "from" expression, which is an implicit cast to the 9479 // appropriately-qualified base type. 9480 Expr *From = OtherRef; 9481 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9482 VK_XValue, &BasePath).take(); 9483 9484 // Dereference "this". 9485 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9486 9487 // Implicitly cast "this" to the appropriately-qualified base type. 9488 To = ImpCastExprToType(To.take(), 9489 Context.getCVRQualifiedType(BaseType, 9490 MoveAssignOperator->getTypeQualifiers()), 9491 CK_UncheckedDerivedToBase, 9492 VK_LValue, &BasePath); 9493 9494 // Build the move. 9495 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9496 To.get(), From, 9497 /*CopyingBaseSubobject=*/true, 9498 /*Copying=*/false); 9499 if (Move.isInvalid()) { 9500 Diag(CurrentLocation, diag::note_member_synthesized_at) 9501 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9502 MoveAssignOperator->setInvalidDecl(); 9503 return; 9504 } 9505 9506 // Success! Record the move. 9507 Statements.push_back(Move.takeAs<Expr>()); 9508 } 9509 9510 // Assign non-static members. 9511 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9512 FieldEnd = ClassDecl->field_end(); 9513 Field != FieldEnd; ++Field) { 9514 if (Field->isUnnamedBitfield()) 9515 continue; 9516 9517 if (Field->isInvalidDecl()) { 9518 Invalid = true; 9519 continue; 9520 } 9521 9522 // Check for members of reference type; we can't move those. 9523 if (Field->getType()->isReferenceType()) { 9524 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9525 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9526 Diag(Field->getLocation(), diag::note_declared_at); 9527 Diag(CurrentLocation, diag::note_member_synthesized_at) 9528 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9529 Invalid = true; 9530 continue; 9531 } 9532 9533 // Check for members of const-qualified, non-class type. 9534 QualType BaseType = Context.getBaseElementType(Field->getType()); 9535 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9536 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9537 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9538 Diag(Field->getLocation(), diag::note_declared_at); 9539 Diag(CurrentLocation, diag::note_member_synthesized_at) 9540 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9541 Invalid = true; 9542 continue; 9543 } 9544 9545 // Suppress assigning zero-width bitfields. 9546 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9547 continue; 9548 9549 QualType FieldType = Field->getType().getNonReferenceType(); 9550 if (FieldType->isIncompleteArrayType()) { 9551 assert(ClassDecl->hasFlexibleArrayMember() && 9552 "Incomplete array type is not valid"); 9553 continue; 9554 } 9555 9556 // Build references to the field in the object we're copying from and to. 9557 CXXScopeSpec SS; // Intentionally empty 9558 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9559 LookupMemberName); 9560 MemberLookup.addDecl(*Field); 9561 MemberLookup.resolveKind(); 9562 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9563 Loc, /*IsArrow=*/false, 9564 SS, SourceLocation(), 0, 9565 MemberLookup, 0); 9566 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9567 Loc, /*IsArrow=*/true, 9568 SS, SourceLocation(), 0, 9569 MemberLookup, 0); 9570 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9571 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9572 9573 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9574 "Member reference with rvalue base must be rvalue except for reference " 9575 "members, which aren't allowed for move assignment."); 9576 9577 // Build the move of this field. 9578 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9579 To.get(), From.get(), 9580 /*CopyingBaseSubobject=*/false, 9581 /*Copying=*/false); 9582 if (Move.isInvalid()) { 9583 Diag(CurrentLocation, diag::note_member_synthesized_at) 9584 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9585 MoveAssignOperator->setInvalidDecl(); 9586 return; 9587 } 9588 9589 // Success! Record the copy. 9590 Statements.push_back(Move.takeAs<Stmt>()); 9591 } 9592 9593 if (!Invalid) { 9594 // Add a "return *this;" 9595 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9596 9597 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9598 if (Return.isInvalid()) 9599 Invalid = true; 9600 else { 9601 Statements.push_back(Return.takeAs<Stmt>()); 9602 9603 if (Trap.hasErrorOccurred()) { 9604 Diag(CurrentLocation, diag::note_member_synthesized_at) 9605 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9606 Invalid = true; 9607 } 9608 } 9609 } 9610 9611 if (Invalid) { 9612 MoveAssignOperator->setInvalidDecl(); 9613 return; 9614 } 9615 9616 StmtResult Body; 9617 { 9618 CompoundScopeRAII CompoundScope(*this); 9619 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9620 /*isStmtExpr=*/false); 9621 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9622 } 9623 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9624 9625 if (ASTMutationListener *L = getASTMutationListener()) { 9626 L->CompletedImplicitDefinition(MoveAssignOperator); 9627 } 9628} 9629 9630Sema::ImplicitExceptionSpecification 9631Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9632 CXXRecordDecl *ClassDecl = MD->getParent(); 9633 9634 ImplicitExceptionSpecification ExceptSpec(*this); 9635 if (ClassDecl->isInvalidDecl()) 9636 return ExceptSpec; 9637 9638 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9639 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9640 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9641 9642 // C++ [except.spec]p14: 9643 // An implicitly declared special member function (Clause 12) shall have an 9644 // exception-specification. [...] 9645 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9646 BaseEnd = ClassDecl->bases_end(); 9647 Base != BaseEnd; 9648 ++Base) { 9649 // Virtual bases are handled below. 9650 if (Base->isVirtual()) 9651 continue; 9652 9653 CXXRecordDecl *BaseClassDecl 9654 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9655 if (CXXConstructorDecl *CopyConstructor = 9656 LookupCopyingConstructor(BaseClassDecl, Quals)) 9657 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9658 } 9659 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9660 BaseEnd = ClassDecl->vbases_end(); 9661 Base != BaseEnd; 9662 ++Base) { 9663 CXXRecordDecl *BaseClassDecl 9664 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9665 if (CXXConstructorDecl *CopyConstructor = 9666 LookupCopyingConstructor(BaseClassDecl, Quals)) 9667 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9668 } 9669 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9670 FieldEnd = ClassDecl->field_end(); 9671 Field != FieldEnd; 9672 ++Field) { 9673 QualType FieldType = Context.getBaseElementType(Field->getType()); 9674 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9675 if (CXXConstructorDecl *CopyConstructor = 9676 LookupCopyingConstructor(FieldClassDecl, 9677 Quals | FieldType.getCVRQualifiers())) 9678 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9679 } 9680 } 9681 9682 return ExceptSpec; 9683} 9684 9685CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9686 CXXRecordDecl *ClassDecl) { 9687 // C++ [class.copy]p4: 9688 // If the class definition does not explicitly declare a copy 9689 // constructor, one is declared implicitly. 9690 assert(ClassDecl->needsImplicitCopyConstructor()); 9691 9692 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9693 if (DSM.isAlreadyBeingDeclared()) 9694 return 0; 9695 9696 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9697 QualType ArgType = ClassType; 9698 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9699 if (Const) 9700 ArgType = ArgType.withConst(); 9701 ArgType = Context.getLValueReferenceType(ArgType); 9702 9703 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9704 CXXCopyConstructor, 9705 Const); 9706 9707 DeclarationName Name 9708 = Context.DeclarationNames.getCXXConstructorName( 9709 Context.getCanonicalType(ClassType)); 9710 SourceLocation ClassLoc = ClassDecl->getLocation(); 9711 DeclarationNameInfo NameInfo(Name, ClassLoc); 9712 9713 // An implicitly-declared copy constructor is an inline public 9714 // member of its class. 9715 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9716 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9717 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9718 Constexpr); 9719 CopyConstructor->setAccess(AS_public); 9720 CopyConstructor->setDefaulted(); 9721 9722 // Build an exception specification pointing back at this member. 9723 FunctionProtoType::ExtProtoInfo EPI; 9724 EPI.ExceptionSpecType = EST_Unevaluated; 9725 EPI.ExceptionSpecDecl = CopyConstructor; 9726 CopyConstructor->setType( 9727 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9728 9729 // Add the parameter to the constructor. 9730 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9731 ClassLoc, ClassLoc, 9732 /*IdentifierInfo=*/0, 9733 ArgType, /*TInfo=*/0, 9734 SC_None, 0); 9735 CopyConstructor->setParams(FromParam); 9736 9737 CopyConstructor->setTrivial( 9738 ClassDecl->needsOverloadResolutionForCopyConstructor() 9739 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9740 : ClassDecl->hasTrivialCopyConstructor()); 9741 9742 // C++11 [class.copy]p8: 9743 // ... If the class definition does not explicitly declare a copy 9744 // constructor, there is no user-declared move constructor, and there is no 9745 // user-declared move assignment operator, a copy constructor is implicitly 9746 // declared as defaulted. 9747 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9748 SetDeclDeleted(CopyConstructor, ClassLoc); 9749 9750 // Note that we have declared this constructor. 9751 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9752 9753 if (Scope *S = getScopeForContext(ClassDecl)) 9754 PushOnScopeChains(CopyConstructor, S, false); 9755 ClassDecl->addDecl(CopyConstructor); 9756 9757 return CopyConstructor; 9758} 9759 9760void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9761 CXXConstructorDecl *CopyConstructor) { 9762 assert((CopyConstructor->isDefaulted() && 9763 CopyConstructor->isCopyConstructor() && 9764 !CopyConstructor->doesThisDeclarationHaveABody() && 9765 !CopyConstructor->isDeleted()) && 9766 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9767 9768 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9769 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9770 9771 // C++11 [class.copy]p7: 9772 // The [definition of an implicitly declared copy constructro] is 9773 // deprecated if the class has a user-declared copy assignment operator 9774 // or a user-declared destructor. 9775 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 9776 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 9777 9778 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9779 DiagnosticErrorTrap Trap(Diags); 9780 9781 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9782 Trap.hasErrorOccurred()) { 9783 Diag(CurrentLocation, diag::note_member_synthesized_at) 9784 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9785 CopyConstructor->setInvalidDecl(); 9786 } else { 9787 Sema::CompoundScopeRAII CompoundScope(*this); 9788 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9789 CopyConstructor->getLocation(), 9790 MultiStmtArg(), 9791 /*isStmtExpr=*/false) 9792 .takeAs<Stmt>()); 9793 CopyConstructor->setImplicitlyDefined(true); 9794 } 9795 9796 CopyConstructor->setUsed(); 9797 if (ASTMutationListener *L = getASTMutationListener()) { 9798 L->CompletedImplicitDefinition(CopyConstructor); 9799 } 9800} 9801 9802Sema::ImplicitExceptionSpecification 9803Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9804 CXXRecordDecl *ClassDecl = MD->getParent(); 9805 9806 // C++ [except.spec]p14: 9807 // An implicitly declared special member function (Clause 12) shall have an 9808 // exception-specification. [...] 9809 ImplicitExceptionSpecification ExceptSpec(*this); 9810 if (ClassDecl->isInvalidDecl()) 9811 return ExceptSpec; 9812 9813 // Direct base-class constructors. 9814 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9815 BEnd = ClassDecl->bases_end(); 9816 B != BEnd; ++B) { 9817 if (B->isVirtual()) // Handled below. 9818 continue; 9819 9820 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9821 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9822 CXXConstructorDecl *Constructor = 9823 LookupMovingConstructor(BaseClassDecl, 0); 9824 // If this is a deleted function, add it anyway. This might be conformant 9825 // with the standard. This might not. I'm not sure. It might not matter. 9826 if (Constructor) 9827 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9828 } 9829 } 9830 9831 // Virtual base-class constructors. 9832 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9833 BEnd = ClassDecl->vbases_end(); 9834 B != BEnd; ++B) { 9835 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9836 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9837 CXXConstructorDecl *Constructor = 9838 LookupMovingConstructor(BaseClassDecl, 0); 9839 // If this is a deleted function, add it anyway. This might be conformant 9840 // with the standard. This might not. I'm not sure. It might not matter. 9841 if (Constructor) 9842 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9843 } 9844 } 9845 9846 // Field constructors. 9847 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9848 FEnd = ClassDecl->field_end(); 9849 F != FEnd; ++F) { 9850 QualType FieldType = Context.getBaseElementType(F->getType()); 9851 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9852 CXXConstructorDecl *Constructor = 9853 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9854 // If this is a deleted function, add it anyway. This might be conformant 9855 // with the standard. This might not. I'm not sure. It might not matter. 9856 // In particular, the problem is that this function never gets called. It 9857 // might just be ill-formed because this function attempts to refer to 9858 // a deleted function here. 9859 if (Constructor) 9860 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9861 } 9862 } 9863 9864 return ExceptSpec; 9865} 9866 9867CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9868 CXXRecordDecl *ClassDecl) { 9869 // C++11 [class.copy]p9: 9870 // If the definition of a class X does not explicitly declare a move 9871 // constructor, one will be implicitly declared as defaulted if and only if: 9872 // 9873 // - [first 4 bullets] 9874 assert(ClassDecl->needsImplicitMoveConstructor()); 9875 9876 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9877 if (DSM.isAlreadyBeingDeclared()) 9878 return 0; 9879 9880 // [Checked after we build the declaration] 9881 // - the move assignment operator would not be implicitly defined as 9882 // deleted, 9883 9884 // [DR1402]: 9885 // - each of X's non-static data members and direct or virtual base classes 9886 // has a type that either has a move constructor or is trivially copyable. 9887 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9888 ClassDecl->setFailedImplicitMoveConstructor(); 9889 return 0; 9890 } 9891 9892 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9893 QualType ArgType = Context.getRValueReferenceType(ClassType); 9894 9895 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9896 CXXMoveConstructor, 9897 false); 9898 9899 DeclarationName Name 9900 = Context.DeclarationNames.getCXXConstructorName( 9901 Context.getCanonicalType(ClassType)); 9902 SourceLocation ClassLoc = ClassDecl->getLocation(); 9903 DeclarationNameInfo NameInfo(Name, ClassLoc); 9904 9905 // C++11 [class.copy]p11: 9906 // An implicitly-declared copy/move constructor is an inline public 9907 // member of its class. 9908 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9909 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9910 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9911 Constexpr); 9912 MoveConstructor->setAccess(AS_public); 9913 MoveConstructor->setDefaulted(); 9914 9915 // Build an exception specification pointing back at this member. 9916 FunctionProtoType::ExtProtoInfo EPI; 9917 EPI.ExceptionSpecType = EST_Unevaluated; 9918 EPI.ExceptionSpecDecl = MoveConstructor; 9919 MoveConstructor->setType( 9920 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9921 9922 // Add the parameter to the constructor. 9923 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9924 ClassLoc, ClassLoc, 9925 /*IdentifierInfo=*/0, 9926 ArgType, /*TInfo=*/0, 9927 SC_None, 0); 9928 MoveConstructor->setParams(FromParam); 9929 9930 MoveConstructor->setTrivial( 9931 ClassDecl->needsOverloadResolutionForMoveConstructor() 9932 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9933 : ClassDecl->hasTrivialMoveConstructor()); 9934 9935 // C++0x [class.copy]p9: 9936 // If the definition of a class X does not explicitly declare a move 9937 // constructor, one will be implicitly declared as defaulted if and only if: 9938 // [...] 9939 // - the move constructor would not be implicitly defined as deleted. 9940 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9941 // Cache this result so that we don't try to generate this over and over 9942 // on every lookup, leaking memory and wasting time. 9943 ClassDecl->setFailedImplicitMoveConstructor(); 9944 return 0; 9945 } 9946 9947 // Note that we have declared this constructor. 9948 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9949 9950 if (Scope *S = getScopeForContext(ClassDecl)) 9951 PushOnScopeChains(MoveConstructor, S, false); 9952 ClassDecl->addDecl(MoveConstructor); 9953 9954 return MoveConstructor; 9955} 9956 9957void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9958 CXXConstructorDecl *MoveConstructor) { 9959 assert((MoveConstructor->isDefaulted() && 9960 MoveConstructor->isMoveConstructor() && 9961 !MoveConstructor->doesThisDeclarationHaveABody() && 9962 !MoveConstructor->isDeleted()) && 9963 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9964 9965 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9966 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9967 9968 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9969 DiagnosticErrorTrap Trap(Diags); 9970 9971 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9972 Trap.hasErrorOccurred()) { 9973 Diag(CurrentLocation, diag::note_member_synthesized_at) 9974 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9975 MoveConstructor->setInvalidDecl(); 9976 } else { 9977 Sema::CompoundScopeRAII CompoundScope(*this); 9978 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9979 MoveConstructor->getLocation(), 9980 MultiStmtArg(), 9981 /*isStmtExpr=*/false) 9982 .takeAs<Stmt>()); 9983 MoveConstructor->setImplicitlyDefined(true); 9984 } 9985 9986 MoveConstructor->setUsed(); 9987 9988 if (ASTMutationListener *L = getASTMutationListener()) { 9989 L->CompletedImplicitDefinition(MoveConstructor); 9990 } 9991} 9992 9993bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9994 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); 9995} 9996 9997/// \brief Mark the call operator of the given lambda closure type as "used". 9998static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9999 CXXMethodDecl *CallOperator 10000 = cast<CXXMethodDecl>( 10001 Lambda->lookup( 10002 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 10003 CallOperator->setReferenced(); 10004 CallOperator->setUsed(); 10005} 10006 10007void Sema::DefineImplicitLambdaToFunctionPointerConversion( 10008 SourceLocation CurrentLocation, 10009 CXXConversionDecl *Conv) 10010{ 10011 CXXRecordDecl *Lambda = Conv->getParent(); 10012 10013 // Make sure that the lambda call operator is marked used. 10014 markLambdaCallOperatorUsed(*this, Lambda); 10015 10016 Conv->setUsed(); 10017 10018 SynthesizedFunctionScope Scope(*this, Conv); 10019 DiagnosticErrorTrap Trap(Diags); 10020 10021 // Return the address of the __invoke function. 10022 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 10023 CXXMethodDecl *Invoke 10024 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 10025 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 10026 VK_LValue, Conv->getLocation()).take(); 10027 assert(FunctionRef && "Can't refer to __invoke function?"); 10028 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 10029 Conv->setBody(new (Context) CompoundStmt(Context, Return, 10030 Conv->getLocation(), 10031 Conv->getLocation())); 10032 10033 // Fill in the __invoke function with a dummy implementation. IR generation 10034 // will fill in the actual details. 10035 Invoke->setUsed(); 10036 Invoke->setReferenced(); 10037 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 10038 10039 if (ASTMutationListener *L = getASTMutationListener()) { 10040 L->CompletedImplicitDefinition(Conv); 10041 L->CompletedImplicitDefinition(Invoke); 10042 } 10043} 10044 10045void Sema::DefineImplicitLambdaToBlockPointerConversion( 10046 SourceLocation CurrentLocation, 10047 CXXConversionDecl *Conv) 10048{ 10049 Conv->setUsed(); 10050 10051 SynthesizedFunctionScope Scope(*this, Conv); 10052 DiagnosticErrorTrap Trap(Diags); 10053 10054 // Copy-initialize the lambda object as needed to capture it. 10055 Expr *This = ActOnCXXThis(CurrentLocation).take(); 10056 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 10057 10058 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 10059 Conv->getLocation(), 10060 Conv, DerefThis); 10061 10062 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 10063 // behavior. Note that only the general conversion function does this 10064 // (since it's unusable otherwise); in the case where we inline the 10065 // block literal, it has block literal lifetime semantics. 10066 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 10067 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 10068 CK_CopyAndAutoreleaseBlockObject, 10069 BuildBlock.get(), 0, VK_RValue); 10070 10071 if (BuildBlock.isInvalid()) { 10072 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10073 Conv->setInvalidDecl(); 10074 return; 10075 } 10076 10077 // Create the return statement that returns the block from the conversion 10078 // function. 10079 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10080 if (Return.isInvalid()) { 10081 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10082 Conv->setInvalidDecl(); 10083 return; 10084 } 10085 10086 // Set the body of the conversion function. 10087 Stmt *ReturnS = Return.take(); 10088 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10089 Conv->getLocation(), 10090 Conv->getLocation())); 10091 10092 // We're done; notify the mutation listener, if any. 10093 if (ASTMutationListener *L = getASTMutationListener()) { 10094 L->CompletedImplicitDefinition(Conv); 10095 } 10096} 10097 10098/// \brief Determine whether the given list arguments contains exactly one 10099/// "real" (non-default) argument. 10100static bool hasOneRealArgument(MultiExprArg Args) { 10101 switch (Args.size()) { 10102 case 0: 10103 return false; 10104 10105 default: 10106 if (!Args[1]->isDefaultArgument()) 10107 return false; 10108 10109 // fall through 10110 case 1: 10111 return !Args[0]->isDefaultArgument(); 10112 } 10113 10114 return false; 10115} 10116 10117ExprResult 10118Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10119 CXXConstructorDecl *Constructor, 10120 MultiExprArg ExprArgs, 10121 bool HadMultipleCandidates, 10122 bool IsListInitialization, 10123 bool RequiresZeroInit, 10124 unsigned ConstructKind, 10125 SourceRange ParenRange) { 10126 bool Elidable = false; 10127 10128 // C++0x [class.copy]p34: 10129 // When certain criteria are met, an implementation is allowed to 10130 // omit the copy/move construction of a class object, even if the 10131 // copy/move constructor and/or destructor for the object have 10132 // side effects. [...] 10133 // - when a temporary class object that has not been bound to a 10134 // reference (12.2) would be copied/moved to a class object 10135 // with the same cv-unqualified type, the copy/move operation 10136 // can be omitted by constructing the temporary object 10137 // directly into the target of the omitted copy/move 10138 if (ConstructKind == CXXConstructExpr::CK_Complete && 10139 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10140 Expr *SubExpr = ExprArgs[0]; 10141 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10142 } 10143 10144 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10145 Elidable, ExprArgs, HadMultipleCandidates, 10146 IsListInitialization, RequiresZeroInit, 10147 ConstructKind, ParenRange); 10148} 10149 10150/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10151/// including handling of its default argument expressions. 10152ExprResult 10153Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10154 CXXConstructorDecl *Constructor, bool Elidable, 10155 MultiExprArg ExprArgs, 10156 bool HadMultipleCandidates, 10157 bool IsListInitialization, 10158 bool RequiresZeroInit, 10159 unsigned ConstructKind, 10160 SourceRange ParenRange) { 10161 MarkFunctionReferenced(ConstructLoc, Constructor); 10162 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10163 Constructor, Elidable, ExprArgs, 10164 HadMultipleCandidates, 10165 IsListInitialization, RequiresZeroInit, 10166 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10167 ParenRange)); 10168} 10169 10170void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10171 if (VD->isInvalidDecl()) return; 10172 10173 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10174 if (ClassDecl->isInvalidDecl()) return; 10175 if (ClassDecl->hasIrrelevantDestructor()) return; 10176 if (ClassDecl->isDependentContext()) return; 10177 10178 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10179 MarkFunctionReferenced(VD->getLocation(), Destructor); 10180 CheckDestructorAccess(VD->getLocation(), Destructor, 10181 PDiag(diag::err_access_dtor_var) 10182 << VD->getDeclName() 10183 << VD->getType()); 10184 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10185 10186 if (!VD->hasGlobalStorage()) return; 10187 10188 // Emit warning for non-trivial dtor in global scope (a real global, 10189 // class-static, function-static). 10190 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10191 10192 // TODO: this should be re-enabled for static locals by !CXAAtExit 10193 if (!VD->isStaticLocal()) 10194 Diag(VD->getLocation(), diag::warn_global_destructor); 10195} 10196 10197/// \brief Given a constructor and the set of arguments provided for the 10198/// constructor, convert the arguments and add any required default arguments 10199/// to form a proper call to this constructor. 10200/// 10201/// \returns true if an error occurred, false otherwise. 10202bool 10203Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10204 MultiExprArg ArgsPtr, 10205 SourceLocation Loc, 10206 SmallVectorImpl<Expr*> &ConvertedArgs, 10207 bool AllowExplicit, 10208 bool IsListInitialization) { 10209 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10210 unsigned NumArgs = ArgsPtr.size(); 10211 Expr **Args = ArgsPtr.data(); 10212 10213 const FunctionProtoType *Proto 10214 = Constructor->getType()->getAs<FunctionProtoType>(); 10215 assert(Proto && "Constructor without a prototype?"); 10216 unsigned NumArgsInProto = Proto->getNumArgs(); 10217 10218 // If too few arguments are available, we'll fill in the rest with defaults. 10219 if (NumArgs < NumArgsInProto) 10220 ConvertedArgs.reserve(NumArgsInProto); 10221 else 10222 ConvertedArgs.reserve(NumArgs); 10223 10224 VariadicCallType CallType = 10225 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10226 SmallVector<Expr *, 8> AllArgs; 10227 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10228 Proto, 0, 10229 llvm::makeArrayRef(Args, NumArgs), 10230 AllArgs, 10231 CallType, AllowExplicit, 10232 IsListInitialization); 10233 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10234 10235 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10236 10237 CheckConstructorCall(Constructor, 10238 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10239 AllArgs.size()), 10240 Proto, Loc); 10241 10242 return Invalid; 10243} 10244 10245static inline bool 10246CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10247 const FunctionDecl *FnDecl) { 10248 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10249 if (isa<NamespaceDecl>(DC)) { 10250 return SemaRef.Diag(FnDecl->getLocation(), 10251 diag::err_operator_new_delete_declared_in_namespace) 10252 << FnDecl->getDeclName(); 10253 } 10254 10255 if (isa<TranslationUnitDecl>(DC) && 10256 FnDecl->getStorageClass() == SC_Static) { 10257 return SemaRef.Diag(FnDecl->getLocation(), 10258 diag::err_operator_new_delete_declared_static) 10259 << FnDecl->getDeclName(); 10260 } 10261 10262 return false; 10263} 10264 10265static inline bool 10266CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10267 CanQualType ExpectedResultType, 10268 CanQualType ExpectedFirstParamType, 10269 unsigned DependentParamTypeDiag, 10270 unsigned InvalidParamTypeDiag) { 10271 QualType ResultType = 10272 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10273 10274 // Check that the result type is not dependent. 10275 if (ResultType->isDependentType()) 10276 return SemaRef.Diag(FnDecl->getLocation(), 10277 diag::err_operator_new_delete_dependent_result_type) 10278 << FnDecl->getDeclName() << ExpectedResultType; 10279 10280 // Check that the result type is what we expect. 10281 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10282 return SemaRef.Diag(FnDecl->getLocation(), 10283 diag::err_operator_new_delete_invalid_result_type) 10284 << FnDecl->getDeclName() << ExpectedResultType; 10285 10286 // A function template must have at least 2 parameters. 10287 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10288 return SemaRef.Diag(FnDecl->getLocation(), 10289 diag::err_operator_new_delete_template_too_few_parameters) 10290 << FnDecl->getDeclName(); 10291 10292 // The function decl must have at least 1 parameter. 10293 if (FnDecl->getNumParams() == 0) 10294 return SemaRef.Diag(FnDecl->getLocation(), 10295 diag::err_operator_new_delete_too_few_parameters) 10296 << FnDecl->getDeclName(); 10297 10298 // Check the first parameter type is not dependent. 10299 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10300 if (FirstParamType->isDependentType()) 10301 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10302 << FnDecl->getDeclName() << ExpectedFirstParamType; 10303 10304 // Check that the first parameter type is what we expect. 10305 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10306 ExpectedFirstParamType) 10307 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10308 << FnDecl->getDeclName() << ExpectedFirstParamType; 10309 10310 return false; 10311} 10312 10313static bool 10314CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10315 // C++ [basic.stc.dynamic.allocation]p1: 10316 // A program is ill-formed if an allocation function is declared in a 10317 // namespace scope other than global scope or declared static in global 10318 // scope. 10319 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10320 return true; 10321 10322 CanQualType SizeTy = 10323 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10324 10325 // C++ [basic.stc.dynamic.allocation]p1: 10326 // The return type shall be void*. The first parameter shall have type 10327 // std::size_t. 10328 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10329 SizeTy, 10330 diag::err_operator_new_dependent_param_type, 10331 diag::err_operator_new_param_type)) 10332 return true; 10333 10334 // C++ [basic.stc.dynamic.allocation]p1: 10335 // The first parameter shall not have an associated default argument. 10336 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10337 return SemaRef.Diag(FnDecl->getLocation(), 10338 diag::err_operator_new_default_arg) 10339 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10340 10341 return false; 10342} 10343 10344static bool 10345CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10346 // C++ [basic.stc.dynamic.deallocation]p1: 10347 // A program is ill-formed if deallocation functions are declared in a 10348 // namespace scope other than global scope or declared static in global 10349 // scope. 10350 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10351 return true; 10352 10353 // C++ [basic.stc.dynamic.deallocation]p2: 10354 // Each deallocation function shall return void and its first parameter 10355 // shall be void*. 10356 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10357 SemaRef.Context.VoidPtrTy, 10358 diag::err_operator_delete_dependent_param_type, 10359 diag::err_operator_delete_param_type)) 10360 return true; 10361 10362 return false; 10363} 10364 10365/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10366/// of this overloaded operator is well-formed. If so, returns false; 10367/// otherwise, emits appropriate diagnostics and returns true. 10368bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10369 assert(FnDecl && FnDecl->isOverloadedOperator() && 10370 "Expected an overloaded operator declaration"); 10371 10372 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10373 10374 // C++ [over.oper]p5: 10375 // The allocation and deallocation functions, operator new, 10376 // operator new[], operator delete and operator delete[], are 10377 // described completely in 3.7.3. The attributes and restrictions 10378 // found in the rest of this subclause do not apply to them unless 10379 // explicitly stated in 3.7.3. 10380 if (Op == OO_Delete || Op == OO_Array_Delete) 10381 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10382 10383 if (Op == OO_New || Op == OO_Array_New) 10384 return CheckOperatorNewDeclaration(*this, FnDecl); 10385 10386 // C++ [over.oper]p6: 10387 // An operator function shall either be a non-static member 10388 // function or be a non-member function and have at least one 10389 // parameter whose type is a class, a reference to a class, an 10390 // enumeration, or a reference to an enumeration. 10391 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10392 if (MethodDecl->isStatic()) 10393 return Diag(FnDecl->getLocation(), 10394 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10395 } else { 10396 bool ClassOrEnumParam = false; 10397 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10398 ParamEnd = FnDecl->param_end(); 10399 Param != ParamEnd; ++Param) { 10400 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10401 if (ParamType->isDependentType() || ParamType->isRecordType() || 10402 ParamType->isEnumeralType()) { 10403 ClassOrEnumParam = true; 10404 break; 10405 } 10406 } 10407 10408 if (!ClassOrEnumParam) 10409 return Diag(FnDecl->getLocation(), 10410 diag::err_operator_overload_needs_class_or_enum) 10411 << FnDecl->getDeclName(); 10412 } 10413 10414 // C++ [over.oper]p8: 10415 // An operator function cannot have default arguments (8.3.6), 10416 // except where explicitly stated below. 10417 // 10418 // Only the function-call operator allows default arguments 10419 // (C++ [over.call]p1). 10420 if (Op != OO_Call) { 10421 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10422 Param != FnDecl->param_end(); ++Param) { 10423 if ((*Param)->hasDefaultArg()) 10424 return Diag((*Param)->getLocation(), 10425 diag::err_operator_overload_default_arg) 10426 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10427 } 10428 } 10429 10430 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10431 { false, false, false } 10432#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10433 , { Unary, Binary, MemberOnly } 10434#include "clang/Basic/OperatorKinds.def" 10435 }; 10436 10437 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10438 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10439 bool MustBeMemberOperator = OperatorUses[Op][2]; 10440 10441 // C++ [over.oper]p8: 10442 // [...] Operator functions cannot have more or fewer parameters 10443 // than the number required for the corresponding operator, as 10444 // described in the rest of this subclause. 10445 unsigned NumParams = FnDecl->getNumParams() 10446 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10447 if (Op != OO_Call && 10448 ((NumParams == 1 && !CanBeUnaryOperator) || 10449 (NumParams == 2 && !CanBeBinaryOperator) || 10450 (NumParams < 1) || (NumParams > 2))) { 10451 // We have the wrong number of parameters. 10452 unsigned ErrorKind; 10453 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10454 ErrorKind = 2; // 2 -> unary or binary. 10455 } else if (CanBeUnaryOperator) { 10456 ErrorKind = 0; // 0 -> unary 10457 } else { 10458 assert(CanBeBinaryOperator && 10459 "All non-call overloaded operators are unary or binary!"); 10460 ErrorKind = 1; // 1 -> binary 10461 } 10462 10463 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10464 << FnDecl->getDeclName() << NumParams << ErrorKind; 10465 } 10466 10467 // Overloaded operators other than operator() cannot be variadic. 10468 if (Op != OO_Call && 10469 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10470 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10471 << FnDecl->getDeclName(); 10472 } 10473 10474 // Some operators must be non-static member functions. 10475 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10476 return Diag(FnDecl->getLocation(), 10477 diag::err_operator_overload_must_be_member) 10478 << FnDecl->getDeclName(); 10479 } 10480 10481 // C++ [over.inc]p1: 10482 // The user-defined function called operator++ implements the 10483 // prefix and postfix ++ operator. If this function is a member 10484 // function with no parameters, or a non-member function with one 10485 // parameter of class or enumeration type, it defines the prefix 10486 // increment operator ++ for objects of that type. If the function 10487 // is a member function with one parameter (which shall be of type 10488 // int) or a non-member function with two parameters (the second 10489 // of which shall be of type int), it defines the postfix 10490 // increment operator ++ for objects of that type. 10491 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10492 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10493 bool ParamIsInt = false; 10494 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10495 ParamIsInt = BT->getKind() == BuiltinType::Int; 10496 10497 if (!ParamIsInt) 10498 return Diag(LastParam->getLocation(), 10499 diag::err_operator_overload_post_incdec_must_be_int) 10500 << LastParam->getType() << (Op == OO_MinusMinus); 10501 } 10502 10503 return false; 10504} 10505 10506/// CheckLiteralOperatorDeclaration - Check whether the declaration 10507/// of this literal operator function is well-formed. If so, returns 10508/// false; otherwise, emits appropriate diagnostics and returns true. 10509bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10510 if (isa<CXXMethodDecl>(FnDecl)) { 10511 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10512 << FnDecl->getDeclName(); 10513 return true; 10514 } 10515 10516 if (FnDecl->isExternC()) { 10517 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10518 return true; 10519 } 10520 10521 bool Valid = false; 10522 10523 // This might be the definition of a literal operator template. 10524 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10525 // This might be a specialization of a literal operator template. 10526 if (!TpDecl) 10527 TpDecl = FnDecl->getPrimaryTemplate(); 10528 10529 // template <char...> type operator "" name() is the only valid template 10530 // signature, and the only valid signature with no parameters. 10531 if (TpDecl) { 10532 if (FnDecl->param_size() == 0) { 10533 // Must have only one template parameter 10534 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10535 if (Params->size() == 1) { 10536 NonTypeTemplateParmDecl *PmDecl = 10537 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10538 10539 // The template parameter must be a char parameter pack. 10540 if (PmDecl && PmDecl->isTemplateParameterPack() && 10541 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10542 Valid = true; 10543 } 10544 } 10545 } else if (FnDecl->param_size()) { 10546 // Check the first parameter 10547 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10548 10549 QualType T = (*Param)->getType().getUnqualifiedType(); 10550 10551 // unsigned long long int, long double, and any character type are allowed 10552 // as the only parameters. 10553 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10554 Context.hasSameType(T, Context.LongDoubleTy) || 10555 Context.hasSameType(T, Context.CharTy) || 10556 Context.hasSameType(T, Context.WideCharTy) || 10557 Context.hasSameType(T, Context.Char16Ty) || 10558 Context.hasSameType(T, Context.Char32Ty)) { 10559 if (++Param == FnDecl->param_end()) 10560 Valid = true; 10561 goto FinishedParams; 10562 } 10563 10564 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10565 const PointerType *PT = T->getAs<PointerType>(); 10566 if (!PT) 10567 goto FinishedParams; 10568 T = PT->getPointeeType(); 10569 if (!T.isConstQualified() || T.isVolatileQualified()) 10570 goto FinishedParams; 10571 T = T.getUnqualifiedType(); 10572 10573 // Move on to the second parameter; 10574 ++Param; 10575 10576 // If there is no second parameter, the first must be a const char * 10577 if (Param == FnDecl->param_end()) { 10578 if (Context.hasSameType(T, Context.CharTy)) 10579 Valid = true; 10580 goto FinishedParams; 10581 } 10582 10583 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10584 // are allowed as the first parameter to a two-parameter function 10585 if (!(Context.hasSameType(T, Context.CharTy) || 10586 Context.hasSameType(T, Context.WideCharTy) || 10587 Context.hasSameType(T, Context.Char16Ty) || 10588 Context.hasSameType(T, Context.Char32Ty))) 10589 goto FinishedParams; 10590 10591 // The second and final parameter must be an std::size_t 10592 T = (*Param)->getType().getUnqualifiedType(); 10593 if (Context.hasSameType(T, Context.getSizeType()) && 10594 ++Param == FnDecl->param_end()) 10595 Valid = true; 10596 } 10597 10598 // FIXME: This diagnostic is absolutely terrible. 10599FinishedParams: 10600 if (!Valid) { 10601 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10602 << FnDecl->getDeclName(); 10603 return true; 10604 } 10605 10606 // A parameter-declaration-clause containing a default argument is not 10607 // equivalent to any of the permitted forms. 10608 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10609 ParamEnd = FnDecl->param_end(); 10610 Param != ParamEnd; ++Param) { 10611 if ((*Param)->hasDefaultArg()) { 10612 Diag((*Param)->getDefaultArgRange().getBegin(), 10613 diag::err_literal_operator_default_argument) 10614 << (*Param)->getDefaultArgRange(); 10615 break; 10616 } 10617 } 10618 10619 StringRef LiteralName 10620 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10621 if (LiteralName[0] != '_') { 10622 // C++11 [usrlit.suffix]p1: 10623 // Literal suffix identifiers that do not start with an underscore 10624 // are reserved for future standardization. 10625 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10626 } 10627 10628 return false; 10629} 10630 10631/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10632/// linkage specification, including the language and (if present) 10633/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10634/// the location of the language string literal, which is provided 10635/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10636/// the '{' brace. Otherwise, this linkage specification does not 10637/// have any braces. 10638Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10639 SourceLocation LangLoc, 10640 StringRef Lang, 10641 SourceLocation LBraceLoc) { 10642 LinkageSpecDecl::LanguageIDs Language; 10643 if (Lang == "\"C\"") 10644 Language = LinkageSpecDecl::lang_c; 10645 else if (Lang == "\"C++\"") 10646 Language = LinkageSpecDecl::lang_cxx; 10647 else { 10648 Diag(LangLoc, diag::err_bad_language); 10649 return 0; 10650 } 10651 10652 // FIXME: Add all the various semantics of linkage specifications 10653 10654 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10655 ExternLoc, LangLoc, Language, 10656 LBraceLoc.isValid()); 10657 CurContext->addDecl(D); 10658 PushDeclContext(S, D); 10659 return D; 10660} 10661 10662/// ActOnFinishLinkageSpecification - Complete the definition of 10663/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10664/// valid, it's the position of the closing '}' brace in a linkage 10665/// specification that uses braces. 10666Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10667 Decl *LinkageSpec, 10668 SourceLocation RBraceLoc) { 10669 if (LinkageSpec) { 10670 if (RBraceLoc.isValid()) { 10671 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10672 LSDecl->setRBraceLoc(RBraceLoc); 10673 } 10674 PopDeclContext(); 10675 } 10676 return LinkageSpec; 10677} 10678 10679Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10680 AttributeList *AttrList, 10681 SourceLocation SemiLoc) { 10682 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10683 // Attribute declarations appertain to empty declaration so we handle 10684 // them here. 10685 if (AttrList) 10686 ProcessDeclAttributeList(S, ED, AttrList); 10687 10688 CurContext->addDecl(ED); 10689 return ED; 10690} 10691 10692/// \brief Perform semantic analysis for the variable declaration that 10693/// occurs within a C++ catch clause, returning the newly-created 10694/// variable. 10695VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10696 TypeSourceInfo *TInfo, 10697 SourceLocation StartLoc, 10698 SourceLocation Loc, 10699 IdentifierInfo *Name) { 10700 bool Invalid = false; 10701 QualType ExDeclType = TInfo->getType(); 10702 10703 // Arrays and functions decay. 10704 if (ExDeclType->isArrayType()) 10705 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10706 else if (ExDeclType->isFunctionType()) 10707 ExDeclType = Context.getPointerType(ExDeclType); 10708 10709 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10710 // The exception-declaration shall not denote a pointer or reference to an 10711 // incomplete type, other than [cv] void*. 10712 // N2844 forbids rvalue references. 10713 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10714 Diag(Loc, diag::err_catch_rvalue_ref); 10715 Invalid = true; 10716 } 10717 10718 QualType BaseType = ExDeclType; 10719 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10720 unsigned DK = diag::err_catch_incomplete; 10721 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10722 BaseType = Ptr->getPointeeType(); 10723 Mode = 1; 10724 DK = diag::err_catch_incomplete_ptr; 10725 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10726 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10727 BaseType = Ref->getPointeeType(); 10728 Mode = 2; 10729 DK = diag::err_catch_incomplete_ref; 10730 } 10731 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10732 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10733 Invalid = true; 10734 10735 if (!Invalid && !ExDeclType->isDependentType() && 10736 RequireNonAbstractType(Loc, ExDeclType, 10737 diag::err_abstract_type_in_decl, 10738 AbstractVariableType)) 10739 Invalid = true; 10740 10741 // Only the non-fragile NeXT runtime currently supports C++ catches 10742 // of ObjC types, and no runtime supports catching ObjC types by value. 10743 if (!Invalid && getLangOpts().ObjC1) { 10744 QualType T = ExDeclType; 10745 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10746 T = RT->getPointeeType(); 10747 10748 if (T->isObjCObjectType()) { 10749 Diag(Loc, diag::err_objc_object_catch); 10750 Invalid = true; 10751 } else if (T->isObjCObjectPointerType()) { 10752 // FIXME: should this be a test for macosx-fragile specifically? 10753 if (getLangOpts().ObjCRuntime.isFragile()) 10754 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10755 } 10756 } 10757 10758 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10759 ExDeclType, TInfo, SC_None); 10760 ExDecl->setExceptionVariable(true); 10761 10762 // In ARC, infer 'retaining' for variables of retainable type. 10763 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10764 Invalid = true; 10765 10766 if (!Invalid && !ExDeclType->isDependentType()) { 10767 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10768 // Insulate this from anything else we might currently be parsing. 10769 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10770 10771 // C++ [except.handle]p16: 10772 // The object declared in an exception-declaration or, if the 10773 // exception-declaration does not specify a name, a temporary (12.2) is 10774 // copy-initialized (8.5) from the exception object. [...] 10775 // The object is destroyed when the handler exits, after the destruction 10776 // of any automatic objects initialized within the handler. 10777 // 10778 // We just pretend to initialize the object with itself, then make sure 10779 // it can be destroyed later. 10780 QualType initType = ExDeclType; 10781 10782 InitializedEntity entity = 10783 InitializedEntity::InitializeVariable(ExDecl); 10784 InitializationKind initKind = 10785 InitializationKind::CreateCopy(Loc, SourceLocation()); 10786 10787 Expr *opaqueValue = 10788 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10789 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 10790 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 10791 if (result.isInvalid()) 10792 Invalid = true; 10793 else { 10794 // If the constructor used was non-trivial, set this as the 10795 // "initializer". 10796 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10797 if (!construct->getConstructor()->isTrivial()) { 10798 Expr *init = MaybeCreateExprWithCleanups(construct); 10799 ExDecl->setInit(init); 10800 } 10801 10802 // And make sure it's destructable. 10803 FinalizeVarWithDestructor(ExDecl, recordType); 10804 } 10805 } 10806 } 10807 10808 if (Invalid) 10809 ExDecl->setInvalidDecl(); 10810 10811 return ExDecl; 10812} 10813 10814/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10815/// handler. 10816Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10817 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10818 bool Invalid = D.isInvalidType(); 10819 10820 // Check for unexpanded parameter packs. 10821 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10822 UPPC_ExceptionType)) { 10823 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10824 D.getIdentifierLoc()); 10825 Invalid = true; 10826 } 10827 10828 IdentifierInfo *II = D.getIdentifier(); 10829 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10830 LookupOrdinaryName, 10831 ForRedeclaration)) { 10832 // The scope should be freshly made just for us. There is just no way 10833 // it contains any previous declaration. 10834 assert(!S->isDeclScope(PrevDecl)); 10835 if (PrevDecl->isTemplateParameter()) { 10836 // Maybe we will complain about the shadowed template parameter. 10837 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10838 PrevDecl = 0; 10839 } 10840 } 10841 10842 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10843 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10844 << D.getCXXScopeSpec().getRange(); 10845 Invalid = true; 10846 } 10847 10848 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10849 D.getLocStart(), 10850 D.getIdentifierLoc(), 10851 D.getIdentifier()); 10852 if (Invalid) 10853 ExDecl->setInvalidDecl(); 10854 10855 // Add the exception declaration into this scope. 10856 if (II) 10857 PushOnScopeChains(ExDecl, S); 10858 else 10859 CurContext->addDecl(ExDecl); 10860 10861 ProcessDeclAttributes(S, ExDecl, D); 10862 return ExDecl; 10863} 10864 10865Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10866 Expr *AssertExpr, 10867 Expr *AssertMessageExpr, 10868 SourceLocation RParenLoc) { 10869 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10870 10871 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10872 return 0; 10873 10874 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10875 AssertMessage, RParenLoc, false); 10876} 10877 10878Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10879 Expr *AssertExpr, 10880 StringLiteral *AssertMessage, 10881 SourceLocation RParenLoc, 10882 bool Failed) { 10883 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10884 !Failed) { 10885 // In a static_assert-declaration, the constant-expression shall be a 10886 // constant expression that can be contextually converted to bool. 10887 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10888 if (Converted.isInvalid()) 10889 Failed = true; 10890 10891 llvm::APSInt Cond; 10892 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10893 diag::err_static_assert_expression_is_not_constant, 10894 /*AllowFold=*/false).isInvalid()) 10895 Failed = true; 10896 10897 if (!Failed && !Cond) { 10898 SmallString<256> MsgBuffer; 10899 llvm::raw_svector_ostream Msg(MsgBuffer); 10900 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10901 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10902 << Msg.str() << AssertExpr->getSourceRange(); 10903 Failed = true; 10904 } 10905 } 10906 10907 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10908 AssertExpr, AssertMessage, RParenLoc, 10909 Failed); 10910 10911 CurContext->addDecl(Decl); 10912 return Decl; 10913} 10914 10915/// \brief Perform semantic analysis of the given friend type declaration. 10916/// 10917/// \returns A friend declaration that. 10918FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10919 SourceLocation FriendLoc, 10920 TypeSourceInfo *TSInfo) { 10921 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10922 10923 QualType T = TSInfo->getType(); 10924 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10925 10926 // C++03 [class.friend]p2: 10927 // An elaborated-type-specifier shall be used in a friend declaration 10928 // for a class.* 10929 // 10930 // * The class-key of the elaborated-type-specifier is required. 10931 if (!ActiveTemplateInstantiations.empty()) { 10932 // Do not complain about the form of friend template types during 10933 // template instantiation; we will already have complained when the 10934 // template was declared. 10935 } else { 10936 if (!T->isElaboratedTypeSpecifier()) { 10937 // If we evaluated the type to a record type, suggest putting 10938 // a tag in front. 10939 if (const RecordType *RT = T->getAs<RecordType>()) { 10940 RecordDecl *RD = RT->getDecl(); 10941 10942 std::string InsertionText = std::string(" ") + RD->getKindName(); 10943 10944 Diag(TypeRange.getBegin(), 10945 getLangOpts().CPlusPlus11 ? 10946 diag::warn_cxx98_compat_unelaborated_friend_type : 10947 diag::ext_unelaborated_friend_type) 10948 << (unsigned) RD->getTagKind() 10949 << T 10950 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10951 InsertionText); 10952 } else { 10953 Diag(FriendLoc, 10954 getLangOpts().CPlusPlus11 ? 10955 diag::warn_cxx98_compat_nonclass_type_friend : 10956 diag::ext_nonclass_type_friend) 10957 << T 10958 << TypeRange; 10959 } 10960 } else if (T->getAs<EnumType>()) { 10961 Diag(FriendLoc, 10962 getLangOpts().CPlusPlus11 ? 10963 diag::warn_cxx98_compat_enum_friend : 10964 diag::ext_enum_friend) 10965 << T 10966 << TypeRange; 10967 } 10968 10969 // C++11 [class.friend]p3: 10970 // A friend declaration that does not declare a function shall have one 10971 // of the following forms: 10972 // friend elaborated-type-specifier ; 10973 // friend simple-type-specifier ; 10974 // friend typename-specifier ; 10975 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10976 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10977 } 10978 10979 // If the type specifier in a friend declaration designates a (possibly 10980 // cv-qualified) class type, that class is declared as a friend; otherwise, 10981 // the friend declaration is ignored. 10982 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10983} 10984 10985/// Handle a friend tag declaration where the scope specifier was 10986/// templated. 10987Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10988 unsigned TagSpec, SourceLocation TagLoc, 10989 CXXScopeSpec &SS, 10990 IdentifierInfo *Name, 10991 SourceLocation NameLoc, 10992 AttributeList *Attr, 10993 MultiTemplateParamsArg TempParamLists) { 10994 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10995 10996 bool isExplicitSpecialization = false; 10997 bool Invalid = false; 10998 10999 if (TemplateParameterList *TemplateParams 11000 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 11001 TempParamLists.data(), 11002 TempParamLists.size(), 11003 /*friend*/ true, 11004 isExplicitSpecialization, 11005 Invalid)) { 11006 if (TemplateParams->size() > 0) { 11007 // This is a declaration of a class template. 11008 if (Invalid) 11009 return 0; 11010 11011 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 11012 SS, Name, NameLoc, Attr, 11013 TemplateParams, AS_public, 11014 /*ModulePrivateLoc=*/SourceLocation(), 11015 TempParamLists.size() - 1, 11016 TempParamLists.data()).take(); 11017 } else { 11018 // The "template<>" header is extraneous. 11019 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 11020 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 11021 isExplicitSpecialization = true; 11022 } 11023 } 11024 11025 if (Invalid) return 0; 11026 11027 bool isAllExplicitSpecializations = true; 11028 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 11029 if (TempParamLists[I]->size()) { 11030 isAllExplicitSpecializations = false; 11031 break; 11032 } 11033 } 11034 11035 // FIXME: don't ignore attributes. 11036 11037 // If it's explicit specializations all the way down, just forget 11038 // about the template header and build an appropriate non-templated 11039 // friend. TODO: for source fidelity, remember the headers. 11040 if (isAllExplicitSpecializations) { 11041 if (SS.isEmpty()) { 11042 bool Owned = false; 11043 bool IsDependent = false; 11044 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 11045 Attr, AS_public, 11046 /*ModulePrivateLoc=*/SourceLocation(), 11047 MultiTemplateParamsArg(), Owned, IsDependent, 11048 /*ScopedEnumKWLoc=*/SourceLocation(), 11049 /*ScopedEnumUsesClassTag=*/false, 11050 /*UnderlyingType=*/TypeResult()); 11051 } 11052 11053 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 11054 ElaboratedTypeKeyword Keyword 11055 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11056 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 11057 *Name, NameLoc); 11058 if (T.isNull()) 11059 return 0; 11060 11061 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11062 if (isa<DependentNameType>(T)) { 11063 DependentNameTypeLoc TL = 11064 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11065 TL.setElaboratedKeywordLoc(TagLoc); 11066 TL.setQualifierLoc(QualifierLoc); 11067 TL.setNameLoc(NameLoc); 11068 } else { 11069 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 11070 TL.setElaboratedKeywordLoc(TagLoc); 11071 TL.setQualifierLoc(QualifierLoc); 11072 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 11073 } 11074 11075 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11076 TSI, FriendLoc, TempParamLists); 11077 Friend->setAccess(AS_public); 11078 CurContext->addDecl(Friend); 11079 return Friend; 11080 } 11081 11082 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11083 11084 11085 11086 // Handle the case of a templated-scope friend class. e.g. 11087 // template <class T> class A<T>::B; 11088 // FIXME: we don't support these right now. 11089 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11090 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11091 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11092 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11093 TL.setElaboratedKeywordLoc(TagLoc); 11094 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11095 TL.setNameLoc(NameLoc); 11096 11097 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11098 TSI, FriendLoc, TempParamLists); 11099 Friend->setAccess(AS_public); 11100 Friend->setUnsupportedFriend(true); 11101 CurContext->addDecl(Friend); 11102 return Friend; 11103} 11104 11105 11106/// Handle a friend type declaration. This works in tandem with 11107/// ActOnTag. 11108/// 11109/// Notes on friend class templates: 11110/// 11111/// We generally treat friend class declarations as if they were 11112/// declaring a class. So, for example, the elaborated type specifier 11113/// in a friend declaration is required to obey the restrictions of a 11114/// class-head (i.e. no typedefs in the scope chain), template 11115/// parameters are required to match up with simple template-ids, &c. 11116/// However, unlike when declaring a template specialization, it's 11117/// okay to refer to a template specialization without an empty 11118/// template parameter declaration, e.g. 11119/// friend class A<T>::B<unsigned>; 11120/// We permit this as a special case; if there are any template 11121/// parameters present at all, require proper matching, i.e. 11122/// template <> template \<class T> friend class A<int>::B; 11123Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11124 MultiTemplateParamsArg TempParams) { 11125 SourceLocation Loc = DS.getLocStart(); 11126 11127 assert(DS.isFriendSpecified()); 11128 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11129 11130 // Try to convert the decl specifier to a type. This works for 11131 // friend templates because ActOnTag never produces a ClassTemplateDecl 11132 // for a TUK_Friend. 11133 Declarator TheDeclarator(DS, Declarator::MemberContext); 11134 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11135 QualType T = TSI->getType(); 11136 if (TheDeclarator.isInvalidType()) 11137 return 0; 11138 11139 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11140 return 0; 11141 11142 // This is definitely an error in C++98. It's probably meant to 11143 // be forbidden in C++0x, too, but the specification is just 11144 // poorly written. 11145 // 11146 // The problem is with declarations like the following: 11147 // template <T> friend A<T>::foo; 11148 // where deciding whether a class C is a friend or not now hinges 11149 // on whether there exists an instantiation of A that causes 11150 // 'foo' to equal C. There are restrictions on class-heads 11151 // (which we declare (by fiat) elaborated friend declarations to 11152 // be) that makes this tractable. 11153 // 11154 // FIXME: handle "template <> friend class A<T>;", which 11155 // is possibly well-formed? Who even knows? 11156 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11157 Diag(Loc, diag::err_tagless_friend_type_template) 11158 << DS.getSourceRange(); 11159 return 0; 11160 } 11161 11162 // C++98 [class.friend]p1: A friend of a class is a function 11163 // or class that is not a member of the class . . . 11164 // This is fixed in DR77, which just barely didn't make the C++03 11165 // deadline. It's also a very silly restriction that seriously 11166 // affects inner classes and which nobody else seems to implement; 11167 // thus we never diagnose it, not even in -pedantic. 11168 // 11169 // But note that we could warn about it: it's always useless to 11170 // friend one of your own members (it's not, however, worthless to 11171 // friend a member of an arbitrary specialization of your template). 11172 11173 Decl *D; 11174 if (unsigned NumTempParamLists = TempParams.size()) 11175 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11176 NumTempParamLists, 11177 TempParams.data(), 11178 TSI, 11179 DS.getFriendSpecLoc()); 11180 else 11181 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11182 11183 if (!D) 11184 return 0; 11185 11186 D->setAccess(AS_public); 11187 CurContext->addDecl(D); 11188 11189 return D; 11190} 11191 11192NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11193 MultiTemplateParamsArg TemplateParams) { 11194 const DeclSpec &DS = D.getDeclSpec(); 11195 11196 assert(DS.isFriendSpecified()); 11197 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11198 11199 SourceLocation Loc = D.getIdentifierLoc(); 11200 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11201 11202 // C++ [class.friend]p1 11203 // A friend of a class is a function or class.... 11204 // Note that this sees through typedefs, which is intended. 11205 // It *doesn't* see through dependent types, which is correct 11206 // according to [temp.arg.type]p3: 11207 // If a declaration acquires a function type through a 11208 // type dependent on a template-parameter and this causes 11209 // a declaration that does not use the syntactic form of a 11210 // function declarator to have a function type, the program 11211 // is ill-formed. 11212 if (!TInfo->getType()->isFunctionType()) { 11213 Diag(Loc, diag::err_unexpected_friend); 11214 11215 // It might be worthwhile to try to recover by creating an 11216 // appropriate declaration. 11217 return 0; 11218 } 11219 11220 // C++ [namespace.memdef]p3 11221 // - If a friend declaration in a non-local class first declares a 11222 // class or function, the friend class or function is a member 11223 // of the innermost enclosing namespace. 11224 // - The name of the friend is not found by simple name lookup 11225 // until a matching declaration is provided in that namespace 11226 // scope (either before or after the class declaration granting 11227 // friendship). 11228 // - If a friend function is called, its name may be found by the 11229 // name lookup that considers functions from namespaces and 11230 // classes associated with the types of the function arguments. 11231 // - When looking for a prior declaration of a class or a function 11232 // declared as a friend, scopes outside the innermost enclosing 11233 // namespace scope are not considered. 11234 11235 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11236 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11237 DeclarationName Name = NameInfo.getName(); 11238 assert(Name); 11239 11240 // Check for unexpanded parameter packs. 11241 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11242 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11243 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11244 return 0; 11245 11246 // The context we found the declaration in, or in which we should 11247 // create the declaration. 11248 DeclContext *DC; 11249 Scope *DCScope = S; 11250 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11251 ForRedeclaration); 11252 11253 // FIXME: there are different rules in local classes 11254 11255 // There are four cases here. 11256 // - There's no scope specifier, in which case we just go to the 11257 // appropriate scope and look for a function or function template 11258 // there as appropriate. 11259 // Recover from invalid scope qualifiers as if they just weren't there. 11260 if (SS.isInvalid() || !SS.isSet()) { 11261 // C++0x [namespace.memdef]p3: 11262 // If the name in a friend declaration is neither qualified nor 11263 // a template-id and the declaration is a function or an 11264 // elaborated-type-specifier, the lookup to determine whether 11265 // the entity has been previously declared shall not consider 11266 // any scopes outside the innermost enclosing namespace. 11267 // C++0x [class.friend]p11: 11268 // If a friend declaration appears in a local class and the name 11269 // specified is an unqualified name, a prior declaration is 11270 // looked up without considering scopes that are outside the 11271 // innermost enclosing non-class scope. For a friend function 11272 // declaration, if there is no prior declaration, the program is 11273 // ill-formed. 11274 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 11275 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11276 11277 // Find the appropriate context according to the above. 11278 DC = CurContext; 11279 11280 // Skip class contexts. If someone can cite chapter and verse 11281 // for this behavior, that would be nice --- it's what GCC and 11282 // EDG do, and it seems like a reasonable intent, but the spec 11283 // really only says that checks for unqualified existing 11284 // declarations should stop at the nearest enclosing namespace, 11285 // not that they should only consider the nearest enclosing 11286 // namespace. 11287 while (DC->isRecord()) 11288 DC = DC->getParent(); 11289 11290 DeclContext *LookupDC = DC; 11291 while (LookupDC->isTransparentContext()) 11292 LookupDC = LookupDC->getParent(); 11293 11294 while (true) { 11295 LookupQualifiedName(Previous, LookupDC); 11296 11297 // TODO: decide what we think about using declarations. 11298 if (isLocal) 11299 break; 11300 11301 if (!Previous.empty()) { 11302 DC = LookupDC; 11303 break; 11304 } 11305 11306 if (isTemplateId) { 11307 if (isa<TranslationUnitDecl>(LookupDC)) break; 11308 } else { 11309 if (LookupDC->isFileContext()) break; 11310 } 11311 LookupDC = LookupDC->getParent(); 11312 } 11313 11314 DCScope = getScopeForDeclContext(S, DC); 11315 11316 // C++ [class.friend]p6: 11317 // A function can be defined in a friend declaration of a class if and 11318 // only if the class is a non-local class (9.8), the function name is 11319 // unqualified, and the function has namespace scope. 11320 if (isLocal && D.isFunctionDefinition()) { 11321 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11322 } 11323 11324 // - There's a non-dependent scope specifier, in which case we 11325 // compute it and do a previous lookup there for a function 11326 // or function template. 11327 } else if (!SS.getScopeRep()->isDependent()) { 11328 DC = computeDeclContext(SS); 11329 if (!DC) return 0; 11330 11331 if (RequireCompleteDeclContext(SS, DC)) return 0; 11332 11333 LookupQualifiedName(Previous, DC); 11334 11335 // Ignore things found implicitly in the wrong scope. 11336 // TODO: better diagnostics for this case. Suggesting the right 11337 // qualified scope would be nice... 11338 LookupResult::Filter F = Previous.makeFilter(); 11339 while (F.hasNext()) { 11340 NamedDecl *D = F.next(); 11341 if (!DC->InEnclosingNamespaceSetOf( 11342 D->getDeclContext()->getRedeclContext())) 11343 F.erase(); 11344 } 11345 F.done(); 11346 11347 if (Previous.empty()) { 11348 D.setInvalidType(); 11349 Diag(Loc, diag::err_qualified_friend_not_found) 11350 << Name << TInfo->getType(); 11351 return 0; 11352 } 11353 11354 // C++ [class.friend]p1: A friend of a class is a function or 11355 // class that is not a member of the class . . . 11356 if (DC->Equals(CurContext)) 11357 Diag(DS.getFriendSpecLoc(), 11358 getLangOpts().CPlusPlus11 ? 11359 diag::warn_cxx98_compat_friend_is_member : 11360 diag::err_friend_is_member); 11361 11362 if (D.isFunctionDefinition()) { 11363 // C++ [class.friend]p6: 11364 // A function can be defined in a friend declaration of a class if and 11365 // only if the class is a non-local class (9.8), the function name is 11366 // unqualified, and the function has namespace scope. 11367 SemaDiagnosticBuilder DB 11368 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11369 11370 DB << SS.getScopeRep(); 11371 if (DC->isFileContext()) 11372 DB << FixItHint::CreateRemoval(SS.getRange()); 11373 SS.clear(); 11374 } 11375 11376 // - There's a scope specifier that does not match any template 11377 // parameter lists, in which case we use some arbitrary context, 11378 // create a method or method template, and wait for instantiation. 11379 // - There's a scope specifier that does match some template 11380 // parameter lists, which we don't handle right now. 11381 } else { 11382 if (D.isFunctionDefinition()) { 11383 // C++ [class.friend]p6: 11384 // A function can be defined in a friend declaration of a class if and 11385 // only if the class is a non-local class (9.8), the function name is 11386 // unqualified, and the function has namespace scope. 11387 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11388 << SS.getScopeRep(); 11389 } 11390 11391 DC = CurContext; 11392 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11393 } 11394 11395 if (!DC->isRecord()) { 11396 // This implies that it has to be an operator or function. 11397 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11398 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11399 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11400 Diag(Loc, diag::err_introducing_special_friend) << 11401 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11402 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11403 return 0; 11404 } 11405 } 11406 11407 // FIXME: This is an egregious hack to cope with cases where the scope stack 11408 // does not contain the declaration context, i.e., in an out-of-line 11409 // definition of a class. 11410 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11411 if (!DCScope) { 11412 FakeDCScope.setEntity(DC); 11413 DCScope = &FakeDCScope; 11414 } 11415 11416 bool AddToScope = true; 11417 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11418 TemplateParams, AddToScope); 11419 if (!ND) return 0; 11420 11421 assert(ND->getDeclContext() == DC); 11422 assert(ND->getLexicalDeclContext() == CurContext); 11423 11424 // Add the function declaration to the appropriate lookup tables, 11425 // adjusting the redeclarations list as necessary. We don't 11426 // want to do this yet if the friending class is dependent. 11427 // 11428 // Also update the scope-based lookup if the target context's 11429 // lookup context is in lexical scope. 11430 if (!CurContext->isDependentContext()) { 11431 DC = DC->getRedeclContext(); 11432 DC->makeDeclVisibleInContext(ND); 11433 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11434 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11435 } 11436 11437 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11438 D.getIdentifierLoc(), ND, 11439 DS.getFriendSpecLoc()); 11440 FrD->setAccess(AS_public); 11441 CurContext->addDecl(FrD); 11442 11443 if (ND->isInvalidDecl()) { 11444 FrD->setInvalidDecl(); 11445 } else { 11446 if (DC->isRecord()) CheckFriendAccess(ND); 11447 11448 FunctionDecl *FD; 11449 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11450 FD = FTD->getTemplatedDecl(); 11451 else 11452 FD = cast<FunctionDecl>(ND); 11453 11454 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a 11455 // default argument expression, that declaration shall be a definition 11456 // and shall be the only declaration of the function or function 11457 // template in the translation unit. 11458 if (functionDeclHasDefaultArgument(FD)) { 11459 if (FunctionDecl *OldFD = FD->getPreviousDecl()) { 11460 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 11461 Diag(OldFD->getLocation(), diag::note_previous_declaration); 11462 } else if (!D.isFunctionDefinition()) 11463 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); 11464 } 11465 11466 // Mark templated-scope function declarations as unsupported. 11467 if (FD->getNumTemplateParameterLists()) 11468 FrD->setUnsupportedFriend(true); 11469 } 11470 11471 return ND; 11472} 11473 11474void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11475 AdjustDeclIfTemplate(Dcl); 11476 11477 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11478 if (!Fn) { 11479 Diag(DelLoc, diag::err_deleted_non_function); 11480 return; 11481 } 11482 11483 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11484 // Don't consider the implicit declaration we generate for explicit 11485 // specializations. FIXME: Do not generate these implicit declarations. 11486 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11487 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11488 Diag(DelLoc, diag::err_deleted_decl_not_first); 11489 Diag(Prev->getLocation(), diag::note_previous_declaration); 11490 } 11491 // If the declaration wasn't the first, we delete the function anyway for 11492 // recovery. 11493 Fn = Fn->getCanonicalDecl(); 11494 } 11495 11496 if (Fn->isDeleted()) 11497 return; 11498 11499 // See if we're deleting a function which is already known to override a 11500 // non-deleted virtual function. 11501 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11502 bool IssuedDiagnostic = false; 11503 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11504 E = MD->end_overridden_methods(); 11505 I != E; ++I) { 11506 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11507 if (!IssuedDiagnostic) { 11508 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11509 IssuedDiagnostic = true; 11510 } 11511 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11512 } 11513 } 11514 } 11515 11516 Fn->setDeletedAsWritten(); 11517} 11518 11519void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11520 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11521 11522 if (MD) { 11523 if (MD->getParent()->isDependentType()) { 11524 MD->setDefaulted(); 11525 MD->setExplicitlyDefaulted(); 11526 return; 11527 } 11528 11529 CXXSpecialMember Member = getSpecialMember(MD); 11530 if (Member == CXXInvalid) { 11531 if (!MD->isInvalidDecl()) 11532 Diag(DefaultLoc, diag::err_default_special_members); 11533 return; 11534 } 11535 11536 MD->setDefaulted(); 11537 MD->setExplicitlyDefaulted(); 11538 11539 // If this definition appears within the record, do the checking when 11540 // the record is complete. 11541 const FunctionDecl *Primary = MD; 11542 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11543 // Find the uninstantiated declaration that actually had the '= default' 11544 // on it. 11545 Pattern->isDefined(Primary); 11546 11547 // If the method was defaulted on its first declaration, we will have 11548 // already performed the checking in CheckCompletedCXXClass. Such a 11549 // declaration doesn't trigger an implicit definition. 11550 if (Primary == Primary->getCanonicalDecl()) 11551 return; 11552 11553 CheckExplicitlyDefaultedSpecialMember(MD); 11554 11555 // The exception specification is needed because we are defining the 11556 // function. 11557 ResolveExceptionSpec(DefaultLoc, 11558 MD->getType()->castAs<FunctionProtoType>()); 11559 11560 switch (Member) { 11561 case CXXDefaultConstructor: { 11562 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11563 if (!CD->isInvalidDecl()) 11564 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11565 break; 11566 } 11567 11568 case CXXCopyConstructor: { 11569 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11570 if (!CD->isInvalidDecl()) 11571 DefineImplicitCopyConstructor(DefaultLoc, CD); 11572 break; 11573 } 11574 11575 case CXXCopyAssignment: { 11576 if (!MD->isInvalidDecl()) 11577 DefineImplicitCopyAssignment(DefaultLoc, MD); 11578 break; 11579 } 11580 11581 case CXXDestructor: { 11582 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11583 if (!DD->isInvalidDecl()) 11584 DefineImplicitDestructor(DefaultLoc, DD); 11585 break; 11586 } 11587 11588 case CXXMoveConstructor: { 11589 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11590 if (!CD->isInvalidDecl()) 11591 DefineImplicitMoveConstructor(DefaultLoc, CD); 11592 break; 11593 } 11594 11595 case CXXMoveAssignment: { 11596 if (!MD->isInvalidDecl()) 11597 DefineImplicitMoveAssignment(DefaultLoc, MD); 11598 break; 11599 } 11600 11601 case CXXInvalid: 11602 llvm_unreachable("Invalid special member."); 11603 } 11604 } else { 11605 Diag(DefaultLoc, diag::err_default_special_members); 11606 } 11607} 11608 11609static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11610 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11611 Stmt *SubStmt = *CI; 11612 if (!SubStmt) 11613 continue; 11614 if (isa<ReturnStmt>(SubStmt)) 11615 Self.Diag(SubStmt->getLocStart(), 11616 diag::err_return_in_constructor_handler); 11617 if (!isa<Expr>(SubStmt)) 11618 SearchForReturnInStmt(Self, SubStmt); 11619 } 11620} 11621 11622void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11623 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11624 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11625 SearchForReturnInStmt(*this, Handler); 11626 } 11627} 11628 11629bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11630 const CXXMethodDecl *Old) { 11631 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11632 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11633 11634 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11635 11636 // If the calling conventions match, everything is fine 11637 if (NewCC == OldCC) 11638 return false; 11639 11640 // If either of the calling conventions are set to "default", we need to pick 11641 // something more sensible based on the target. This supports code where the 11642 // one method explicitly sets thiscall, and another has no explicit calling 11643 // convention. 11644 CallingConv Default = 11645 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11646 if (NewCC == CC_Default) 11647 NewCC = Default; 11648 if (OldCC == CC_Default) 11649 OldCC = Default; 11650 11651 // If the calling conventions still don't match, then report the error 11652 if (NewCC != OldCC) { 11653 Diag(New->getLocation(), 11654 diag::err_conflicting_overriding_cc_attributes) 11655 << New->getDeclName() << New->getType() << Old->getType(); 11656 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11657 return true; 11658 } 11659 11660 return false; 11661} 11662 11663bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11664 const CXXMethodDecl *Old) { 11665 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11666 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11667 11668 if (Context.hasSameType(NewTy, OldTy) || 11669 NewTy->isDependentType() || OldTy->isDependentType()) 11670 return false; 11671 11672 // Check if the return types are covariant 11673 QualType NewClassTy, OldClassTy; 11674 11675 /// Both types must be pointers or references to classes. 11676 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11677 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11678 NewClassTy = NewPT->getPointeeType(); 11679 OldClassTy = OldPT->getPointeeType(); 11680 } 11681 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11682 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11683 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11684 NewClassTy = NewRT->getPointeeType(); 11685 OldClassTy = OldRT->getPointeeType(); 11686 } 11687 } 11688 } 11689 11690 // The return types aren't either both pointers or references to a class type. 11691 if (NewClassTy.isNull()) { 11692 Diag(New->getLocation(), 11693 diag::err_different_return_type_for_overriding_virtual_function) 11694 << New->getDeclName() << NewTy << OldTy; 11695 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11696 11697 return true; 11698 } 11699 11700 // C++ [class.virtual]p6: 11701 // If the return type of D::f differs from the return type of B::f, the 11702 // class type in the return type of D::f shall be complete at the point of 11703 // declaration of D::f or shall be the class type D. 11704 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11705 if (!RT->isBeingDefined() && 11706 RequireCompleteType(New->getLocation(), NewClassTy, 11707 diag::err_covariant_return_incomplete, 11708 New->getDeclName())) 11709 return true; 11710 } 11711 11712 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11713 // Check if the new class derives from the old class. 11714 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11715 Diag(New->getLocation(), 11716 diag::err_covariant_return_not_derived) 11717 << New->getDeclName() << NewTy << OldTy; 11718 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11719 return true; 11720 } 11721 11722 // Check if we the conversion from derived to base is valid. 11723 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11724 diag::err_covariant_return_inaccessible_base, 11725 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11726 // FIXME: Should this point to the return type? 11727 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11728 // FIXME: this note won't trigger for delayed access control 11729 // diagnostics, and it's impossible to get an undelayed error 11730 // here from access control during the original parse because 11731 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11732 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11733 return true; 11734 } 11735 } 11736 11737 // The qualifiers of the return types must be the same. 11738 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11739 Diag(New->getLocation(), 11740 diag::err_covariant_return_type_different_qualifications) 11741 << New->getDeclName() << NewTy << OldTy; 11742 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11743 return true; 11744 }; 11745 11746 11747 // The new class type must have the same or less qualifiers as the old type. 11748 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11749 Diag(New->getLocation(), 11750 diag::err_covariant_return_type_class_type_more_qualified) 11751 << New->getDeclName() << NewTy << OldTy; 11752 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11753 return true; 11754 }; 11755 11756 return false; 11757} 11758 11759/// \brief Mark the given method pure. 11760/// 11761/// \param Method the method to be marked pure. 11762/// 11763/// \param InitRange the source range that covers the "0" initializer. 11764bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11765 SourceLocation EndLoc = InitRange.getEnd(); 11766 if (EndLoc.isValid()) 11767 Method->setRangeEnd(EndLoc); 11768 11769 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11770 Method->setPure(); 11771 return false; 11772 } 11773 11774 if (!Method->isInvalidDecl()) 11775 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11776 << Method->getDeclName() << InitRange; 11777 return true; 11778} 11779 11780/// \brief Determine whether the given declaration is a static data member. 11781static bool isStaticDataMember(Decl *D) { 11782 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11783 if (!Var) 11784 return false; 11785 11786 return Var->isStaticDataMember(); 11787} 11788/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11789/// an initializer for the out-of-line declaration 'Dcl'. The scope 11790/// is a fresh scope pushed for just this purpose. 11791/// 11792/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11793/// static data member of class X, names should be looked up in the scope of 11794/// class X. 11795void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11796 // If there is no declaration, there was an error parsing it. 11797 if (D == 0 || D->isInvalidDecl()) return; 11798 11799 // We should only get called for declarations with scope specifiers, like: 11800 // int foo::bar; 11801 assert(D->isOutOfLine()); 11802 EnterDeclaratorContext(S, D->getDeclContext()); 11803 11804 // If we are parsing the initializer for a static data member, push a 11805 // new expression evaluation context that is associated with this static 11806 // data member. 11807 if (isStaticDataMember(D)) 11808 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11809} 11810 11811/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11812/// initializer for the out-of-line declaration 'D'. 11813void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11814 // If there is no declaration, there was an error parsing it. 11815 if (D == 0 || D->isInvalidDecl()) return; 11816 11817 if (isStaticDataMember(D)) 11818 PopExpressionEvaluationContext(); 11819 11820 assert(D->isOutOfLine()); 11821 ExitDeclaratorContext(S); 11822} 11823 11824/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11825/// C++ if/switch/while/for statement. 11826/// e.g: "if (int x = f()) {...}" 11827DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11828 // C++ 6.4p2: 11829 // The declarator shall not specify a function or an array. 11830 // The type-specifier-seq shall not contain typedef and shall not declare a 11831 // new class or enumeration. 11832 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11833 "Parser allowed 'typedef' as storage class of condition decl."); 11834 11835 Decl *Dcl = ActOnDeclarator(S, D); 11836 if (!Dcl) 11837 return true; 11838 11839 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11840 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11841 << D.getSourceRange(); 11842 return true; 11843 } 11844 11845 return Dcl; 11846} 11847 11848void Sema::LoadExternalVTableUses() { 11849 if (!ExternalSource) 11850 return; 11851 11852 SmallVector<ExternalVTableUse, 4> VTables; 11853 ExternalSource->ReadUsedVTables(VTables); 11854 SmallVector<VTableUse, 4> NewUses; 11855 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11856 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11857 = VTablesUsed.find(VTables[I].Record); 11858 // Even if a definition wasn't required before, it may be required now. 11859 if (Pos != VTablesUsed.end()) { 11860 if (!Pos->second && VTables[I].DefinitionRequired) 11861 Pos->second = true; 11862 continue; 11863 } 11864 11865 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11866 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11867 } 11868 11869 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11870} 11871 11872void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11873 bool DefinitionRequired) { 11874 // Ignore any vtable uses in unevaluated operands or for classes that do 11875 // not have a vtable. 11876 if (!Class->isDynamicClass() || Class->isDependentContext() || 11877 CurContext->isDependentContext() || isUnevaluatedContext()) 11878 return; 11879 11880 // Try to insert this class into the map. 11881 LoadExternalVTableUses(); 11882 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11883 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11884 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11885 if (!Pos.second) { 11886 // If we already had an entry, check to see if we are promoting this vtable 11887 // to required a definition. If so, we need to reappend to the VTableUses 11888 // list, since we may have already processed the first entry. 11889 if (DefinitionRequired && !Pos.first->second) { 11890 Pos.first->second = true; 11891 } else { 11892 // Otherwise, we can early exit. 11893 return; 11894 } 11895 } 11896 11897 // Local classes need to have their virtual members marked 11898 // immediately. For all other classes, we mark their virtual members 11899 // at the end of the translation unit. 11900 if (Class->isLocalClass()) 11901 MarkVirtualMembersReferenced(Loc, Class); 11902 else 11903 VTableUses.push_back(std::make_pair(Class, Loc)); 11904} 11905 11906bool Sema::DefineUsedVTables() { 11907 LoadExternalVTableUses(); 11908 if (VTableUses.empty()) 11909 return false; 11910 11911 // Note: The VTableUses vector could grow as a result of marking 11912 // the members of a class as "used", so we check the size each 11913 // time through the loop and prefer indices (which are stable) to 11914 // iterators (which are not). 11915 bool DefinedAnything = false; 11916 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11917 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11918 if (!Class) 11919 continue; 11920 11921 SourceLocation Loc = VTableUses[I].second; 11922 11923 bool DefineVTable = true; 11924 11925 // If this class has a key function, but that key function is 11926 // defined in another translation unit, we don't need to emit the 11927 // vtable even though we're using it. 11928 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11929 if (KeyFunction && !KeyFunction->hasBody()) { 11930 switch (KeyFunction->getTemplateSpecializationKind()) { 11931 case TSK_Undeclared: 11932 case TSK_ExplicitSpecialization: 11933 case TSK_ExplicitInstantiationDeclaration: 11934 // The key function is in another translation unit. 11935 DefineVTable = false; 11936 break; 11937 11938 case TSK_ExplicitInstantiationDefinition: 11939 case TSK_ImplicitInstantiation: 11940 // We will be instantiating the key function. 11941 break; 11942 } 11943 } else if (!KeyFunction) { 11944 // If we have a class with no key function that is the subject 11945 // of an explicit instantiation declaration, suppress the 11946 // vtable; it will live with the explicit instantiation 11947 // definition. 11948 bool IsExplicitInstantiationDeclaration 11949 = Class->getTemplateSpecializationKind() 11950 == TSK_ExplicitInstantiationDeclaration; 11951 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11952 REnd = Class->redecls_end(); 11953 R != REnd; ++R) { 11954 TemplateSpecializationKind TSK 11955 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11956 if (TSK == TSK_ExplicitInstantiationDeclaration) 11957 IsExplicitInstantiationDeclaration = true; 11958 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11959 IsExplicitInstantiationDeclaration = false; 11960 break; 11961 } 11962 } 11963 11964 if (IsExplicitInstantiationDeclaration) 11965 DefineVTable = false; 11966 } 11967 11968 // The exception specifications for all virtual members may be needed even 11969 // if we are not providing an authoritative form of the vtable in this TU. 11970 // We may choose to emit it available_externally anyway. 11971 if (!DefineVTable) { 11972 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11973 continue; 11974 } 11975 11976 // Mark all of the virtual members of this class as referenced, so 11977 // that we can build a vtable. Then, tell the AST consumer that a 11978 // vtable for this class is required. 11979 DefinedAnything = true; 11980 MarkVirtualMembersReferenced(Loc, Class); 11981 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11982 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11983 11984 // Optionally warn if we're emitting a weak vtable. 11985 if (Class->isExternallyVisible() && 11986 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11987 const FunctionDecl *KeyFunctionDef = 0; 11988 if (!KeyFunction || 11989 (KeyFunction->hasBody(KeyFunctionDef) && 11990 KeyFunctionDef->isInlined())) 11991 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11992 TSK_ExplicitInstantiationDefinition 11993 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11994 << Class; 11995 } 11996 } 11997 VTableUses.clear(); 11998 11999 return DefinedAnything; 12000} 12001 12002void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 12003 const CXXRecordDecl *RD) { 12004 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 12005 E = RD->method_end(); I != E; ++I) 12006 if ((*I)->isVirtual() && !(*I)->isPure()) 12007 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 12008} 12009 12010void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 12011 const CXXRecordDecl *RD) { 12012 // Mark all functions which will appear in RD's vtable as used. 12013 CXXFinalOverriderMap FinalOverriders; 12014 RD->getFinalOverriders(FinalOverriders); 12015 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 12016 E = FinalOverriders.end(); 12017 I != E; ++I) { 12018 for (OverridingMethods::const_iterator OI = I->second.begin(), 12019 OE = I->second.end(); 12020 OI != OE; ++OI) { 12021 assert(OI->second.size() > 0 && "no final overrider"); 12022 CXXMethodDecl *Overrider = OI->second.front().Method; 12023 12024 // C++ [basic.def.odr]p2: 12025 // [...] A virtual member function is used if it is not pure. [...] 12026 if (!Overrider->isPure()) 12027 MarkFunctionReferenced(Loc, Overrider); 12028 } 12029 } 12030 12031 // Only classes that have virtual bases need a VTT. 12032 if (RD->getNumVBases() == 0) 12033 return; 12034 12035 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 12036 e = RD->bases_end(); i != e; ++i) { 12037 const CXXRecordDecl *Base = 12038 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 12039 if (Base->getNumVBases() == 0) 12040 continue; 12041 MarkVirtualMembersReferenced(Loc, Base); 12042 } 12043} 12044 12045/// SetIvarInitializers - This routine builds initialization ASTs for the 12046/// Objective-C implementation whose ivars need be initialized. 12047void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 12048 if (!getLangOpts().CPlusPlus) 12049 return; 12050 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 12051 SmallVector<ObjCIvarDecl*, 8> ivars; 12052 CollectIvarsToConstructOrDestruct(OID, ivars); 12053 if (ivars.empty()) 12054 return; 12055 SmallVector<CXXCtorInitializer*, 32> AllToInit; 12056 for (unsigned i = 0; i < ivars.size(); i++) { 12057 FieldDecl *Field = ivars[i]; 12058 if (Field->isInvalidDecl()) 12059 continue; 12060 12061 CXXCtorInitializer *Member; 12062 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 12063 InitializationKind InitKind = 12064 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 12065 12066 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 12067 ExprResult MemberInit = 12068 InitSeq.Perform(*this, InitEntity, InitKind, None); 12069 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 12070 // Note, MemberInit could actually come back empty if no initialization 12071 // is required (e.g., because it would call a trivial default constructor) 12072 if (!MemberInit.get() || MemberInit.isInvalid()) 12073 continue; 12074 12075 Member = 12076 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 12077 SourceLocation(), 12078 MemberInit.takeAs<Expr>(), 12079 SourceLocation()); 12080 AllToInit.push_back(Member); 12081 12082 // Be sure that the destructor is accessible and is marked as referenced. 12083 if (const RecordType *RecordTy 12084 = Context.getBaseElementType(Field->getType()) 12085 ->getAs<RecordType>()) { 12086 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 12087 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 12088 MarkFunctionReferenced(Field->getLocation(), Destructor); 12089 CheckDestructorAccess(Field->getLocation(), Destructor, 12090 PDiag(diag::err_access_dtor_ivar) 12091 << Context.getBaseElementType(Field->getType())); 12092 } 12093 } 12094 } 12095 ObjCImplementation->setIvarInitializers(Context, 12096 AllToInit.data(), AllToInit.size()); 12097 } 12098} 12099 12100static 12101void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12102 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12103 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12104 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12105 Sema &S) { 12106 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 12107 CE = Current.end(); 12108 if (Ctor->isInvalidDecl()) 12109 return; 12110 12111 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12112 12113 // Target may not be determinable yet, for instance if this is a dependent 12114 // call in an uninstantiated template. 12115 if (Target) { 12116 const FunctionDecl *FNTarget = 0; 12117 (void)Target->hasBody(FNTarget); 12118 Target = const_cast<CXXConstructorDecl*>( 12119 cast_or_null<CXXConstructorDecl>(FNTarget)); 12120 } 12121 12122 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12123 // Avoid dereferencing a null pointer here. 12124 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12125 12126 if (!Current.insert(Canonical)) 12127 return; 12128 12129 // We know that beyond here, we aren't chaining into a cycle. 12130 if (!Target || !Target->isDelegatingConstructor() || 12131 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12132 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 12133 Valid.insert(*CI); 12134 Current.clear(); 12135 // We've hit a cycle. 12136 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12137 Current.count(TCanonical)) { 12138 // If we haven't diagnosed this cycle yet, do so now. 12139 if (!Invalid.count(TCanonical)) { 12140 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12141 diag::warn_delegating_ctor_cycle) 12142 << Ctor; 12143 12144 // Don't add a note for a function delegating directly to itself. 12145 if (TCanonical != Canonical) 12146 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12147 12148 CXXConstructorDecl *C = Target; 12149 while (C->getCanonicalDecl() != Canonical) { 12150 const FunctionDecl *FNTarget = 0; 12151 (void)C->getTargetConstructor()->hasBody(FNTarget); 12152 assert(FNTarget && "Ctor cycle through bodiless function"); 12153 12154 C = const_cast<CXXConstructorDecl*>( 12155 cast<CXXConstructorDecl>(FNTarget)); 12156 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12157 } 12158 } 12159 12160 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 12161 Invalid.insert(*CI); 12162 Current.clear(); 12163 } else { 12164 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12165 } 12166} 12167 12168 12169void Sema::CheckDelegatingCtorCycles() { 12170 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12171 12172 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 12173 CE = Current.end(); 12174 12175 for (DelegatingCtorDeclsType::iterator 12176 I = DelegatingCtorDecls.begin(ExternalSource), 12177 E = DelegatingCtorDecls.end(); 12178 I != E; ++I) 12179 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12180 12181 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 12182 (*CI)->setInvalidDecl(); 12183} 12184 12185namespace { 12186 /// \brief AST visitor that finds references to the 'this' expression. 12187 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12188 Sema &S; 12189 12190 public: 12191 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12192 12193 bool VisitCXXThisExpr(CXXThisExpr *E) { 12194 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12195 << E->isImplicit(); 12196 return false; 12197 } 12198 }; 12199} 12200 12201bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12202 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12203 if (!TSInfo) 12204 return false; 12205 12206 TypeLoc TL = TSInfo->getTypeLoc(); 12207 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12208 if (!ProtoTL) 12209 return false; 12210 12211 // C++11 [expr.prim.general]p3: 12212 // [The expression this] shall not appear before the optional 12213 // cv-qualifier-seq and it shall not appear within the declaration of a 12214 // static member function (although its type and value category are defined 12215 // within a static member function as they are within a non-static member 12216 // function). [ Note: this is because declaration matching does not occur 12217 // until the complete declarator is known. - end note ] 12218 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12219 FindCXXThisExpr Finder(*this); 12220 12221 // If the return type came after the cv-qualifier-seq, check it now. 12222 if (Proto->hasTrailingReturn() && 12223 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12224 return true; 12225 12226 // Check the exception specification. 12227 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12228 return true; 12229 12230 return checkThisInStaticMemberFunctionAttributes(Method); 12231} 12232 12233bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12234 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12235 if (!TSInfo) 12236 return false; 12237 12238 TypeLoc TL = TSInfo->getTypeLoc(); 12239 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12240 if (!ProtoTL) 12241 return false; 12242 12243 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12244 FindCXXThisExpr Finder(*this); 12245 12246 switch (Proto->getExceptionSpecType()) { 12247 case EST_Uninstantiated: 12248 case EST_Unevaluated: 12249 case EST_BasicNoexcept: 12250 case EST_DynamicNone: 12251 case EST_MSAny: 12252 case EST_None: 12253 break; 12254 12255 case EST_ComputedNoexcept: 12256 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12257 return true; 12258 12259 case EST_Dynamic: 12260 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12261 EEnd = Proto->exception_end(); 12262 E != EEnd; ++E) { 12263 if (!Finder.TraverseType(*E)) 12264 return true; 12265 } 12266 break; 12267 } 12268 12269 return false; 12270} 12271 12272bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12273 FindCXXThisExpr Finder(*this); 12274 12275 // Check attributes. 12276 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12277 A != AEnd; ++A) { 12278 // FIXME: This should be emitted by tblgen. 12279 Expr *Arg = 0; 12280 ArrayRef<Expr *> Args; 12281 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12282 Arg = G->getArg(); 12283 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12284 Arg = G->getArg(); 12285 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12286 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12287 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12288 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12289 else if (ExclusiveLockFunctionAttr *ELF 12290 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12291 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12292 else if (SharedLockFunctionAttr *SLF 12293 = dyn_cast<SharedLockFunctionAttr>(*A)) 12294 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12295 else if (ExclusiveTrylockFunctionAttr *ETLF 12296 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12297 Arg = ETLF->getSuccessValue(); 12298 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12299 } else if (SharedTrylockFunctionAttr *STLF 12300 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12301 Arg = STLF->getSuccessValue(); 12302 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12303 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12304 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12305 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12306 Arg = LR->getArg(); 12307 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12308 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12309 else if (ExclusiveLocksRequiredAttr *ELR 12310 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12311 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12312 else if (SharedLocksRequiredAttr *SLR 12313 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12314 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12315 12316 if (Arg && !Finder.TraverseStmt(Arg)) 12317 return true; 12318 12319 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12320 if (!Finder.TraverseStmt(Args[I])) 12321 return true; 12322 } 12323 } 12324 12325 return false; 12326} 12327 12328void 12329Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12330 ArrayRef<ParsedType> DynamicExceptions, 12331 ArrayRef<SourceRange> DynamicExceptionRanges, 12332 Expr *NoexceptExpr, 12333 SmallVectorImpl<QualType> &Exceptions, 12334 FunctionProtoType::ExtProtoInfo &EPI) { 12335 Exceptions.clear(); 12336 EPI.ExceptionSpecType = EST; 12337 if (EST == EST_Dynamic) { 12338 Exceptions.reserve(DynamicExceptions.size()); 12339 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12340 // FIXME: Preserve type source info. 12341 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12342 12343 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12344 collectUnexpandedParameterPacks(ET, Unexpanded); 12345 if (!Unexpanded.empty()) { 12346 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12347 UPPC_ExceptionType, 12348 Unexpanded); 12349 continue; 12350 } 12351 12352 // Check that the type is valid for an exception spec, and 12353 // drop it if not. 12354 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12355 Exceptions.push_back(ET); 12356 } 12357 EPI.NumExceptions = Exceptions.size(); 12358 EPI.Exceptions = Exceptions.data(); 12359 return; 12360 } 12361 12362 if (EST == EST_ComputedNoexcept) { 12363 // If an error occurred, there's no expression here. 12364 if (NoexceptExpr) { 12365 assert((NoexceptExpr->isTypeDependent() || 12366 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12367 Context.BoolTy) && 12368 "Parser should have made sure that the expression is boolean"); 12369 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12370 EPI.ExceptionSpecType = EST_BasicNoexcept; 12371 return; 12372 } 12373 12374 if (!NoexceptExpr->isValueDependent()) 12375 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12376 diag::err_noexcept_needs_constant_expression, 12377 /*AllowFold*/ false).take(); 12378 EPI.NoexceptExpr = NoexceptExpr; 12379 } 12380 return; 12381 } 12382} 12383 12384/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12385Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12386 // Implicitly declared functions (e.g. copy constructors) are 12387 // __host__ __device__ 12388 if (D->isImplicit()) 12389 return CFT_HostDevice; 12390 12391 if (D->hasAttr<CUDAGlobalAttr>()) 12392 return CFT_Global; 12393 12394 if (D->hasAttr<CUDADeviceAttr>()) { 12395 if (D->hasAttr<CUDAHostAttr>()) 12396 return CFT_HostDevice; 12397 else 12398 return CFT_Device; 12399 } 12400 12401 return CFT_Host; 12402} 12403 12404bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12405 CUDAFunctionTarget CalleeTarget) { 12406 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12407 // Callable from the device only." 12408 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12409 return true; 12410 12411 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12412 // Callable from the host only." 12413 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12414 // Callable from the host only." 12415 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12416 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12417 return true; 12418 12419 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12420 return true; 12421 12422 return false; 12423} 12424 12425/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12426/// 12427MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12428 SourceLocation DeclStart, 12429 Declarator &D, Expr *BitWidth, 12430 InClassInitStyle InitStyle, 12431 AccessSpecifier AS, 12432 AttributeList *MSPropertyAttr) { 12433 IdentifierInfo *II = D.getIdentifier(); 12434 if (!II) { 12435 Diag(DeclStart, diag::err_anonymous_property); 12436 return NULL; 12437 } 12438 SourceLocation Loc = D.getIdentifierLoc(); 12439 12440 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12441 QualType T = TInfo->getType(); 12442 if (getLangOpts().CPlusPlus) { 12443 CheckExtraCXXDefaultArguments(D); 12444 12445 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12446 UPPC_DataMemberType)) { 12447 D.setInvalidType(); 12448 T = Context.IntTy; 12449 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12450 } 12451 } 12452 12453 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12454 12455 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12456 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12457 diag::err_invalid_thread) 12458 << DeclSpec::getSpecifierName(TSCS); 12459 12460 // Check to see if this name was declared as a member previously 12461 NamedDecl *PrevDecl = 0; 12462 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12463 LookupName(Previous, S); 12464 switch (Previous.getResultKind()) { 12465 case LookupResult::Found: 12466 case LookupResult::FoundUnresolvedValue: 12467 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12468 break; 12469 12470 case LookupResult::FoundOverloaded: 12471 PrevDecl = Previous.getRepresentativeDecl(); 12472 break; 12473 12474 case LookupResult::NotFound: 12475 case LookupResult::NotFoundInCurrentInstantiation: 12476 case LookupResult::Ambiguous: 12477 break; 12478 } 12479 12480 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12481 // Maybe we will complain about the shadowed template parameter. 12482 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12483 // Just pretend that we didn't see the previous declaration. 12484 PrevDecl = 0; 12485 } 12486 12487 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12488 PrevDecl = 0; 12489 12490 SourceLocation TSSL = D.getLocStart(); 12491 MSPropertyDecl *NewPD; 12492 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12493 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12494 II, T, TInfo, TSSL, 12495 Data.GetterId, Data.SetterId); 12496 ProcessDeclAttributes(TUScope, NewPD, D); 12497 NewPD->setAccess(AS); 12498 12499 if (NewPD->isInvalidDecl()) 12500 Record->setInvalidDecl(); 12501 12502 if (D.getDeclSpec().isModulePrivateSpecified()) 12503 NewPD->setModulePrivate(); 12504 12505 if (NewPD->isInvalidDecl() && PrevDecl) { 12506 // Don't introduce NewFD into scope; there's already something 12507 // with the same name in the same scope. 12508 } else if (II) { 12509 PushOnScopeChains(NewPD, S); 12510 } else 12511 Record->addDecl(NewPD); 12512 12513 return NewPD; 12514} 12515