SemaDeclCXX.cpp revision b2969b1e50580344891a98f5b241f8351fe371cf
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/ASTLambda.h" 18#include "clang/AST/ASTMutationListener.h" 19#include "clang/AST/CXXInheritance.h" 20#include "clang/AST/CharUnits.h" 21#include "clang/AST/DeclVisitor.h" 22#include "clang/AST/EvaluatedExprVisitor.h" 23#include "clang/AST/ExprCXX.h" 24#include "clang/AST/RecordLayout.h" 25#include "clang/AST/RecursiveASTVisitor.h" 26#include "clang/AST/StmtVisitor.h" 27#include "clang/AST/TypeLoc.h" 28#include "clang/AST/TypeOrdering.h" 29#include "clang/Basic/PartialDiagnostic.h" 30#include "clang/Basic/TargetInfo.h" 31#include "clang/Lex/LiteralSupport.h" 32#include "clang/Lex/Preprocessor.h" 33#include "clang/Sema/CXXFieldCollector.h" 34#include "clang/Sema/DeclSpec.h" 35#include "clang/Sema/Initialization.h" 36#include "clang/Sema/Lookup.h" 37#include "clang/Sema/ParsedTemplate.h" 38#include "clang/Sema/Scope.h" 39#include "clang/Sema/ScopeInfo.h" 40#include "llvm/ADT/STLExtras.h" 41#include "llvm/ADT/SmallString.h" 42#include <map> 43#include <set> 44 45using namespace clang; 46 47//===----------------------------------------------------------------------===// 48// CheckDefaultArgumentVisitor 49//===----------------------------------------------------------------------===// 50 51namespace { 52 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 53 /// the default argument of a parameter to determine whether it 54 /// contains any ill-formed subexpressions. For example, this will 55 /// diagnose the use of local variables or parameters within the 56 /// default argument expression. 57 class CheckDefaultArgumentVisitor 58 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 59 Expr *DefaultArg; 60 Sema *S; 61 62 public: 63 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 64 : DefaultArg(defarg), S(s) {} 65 66 bool VisitExpr(Expr *Node); 67 bool VisitDeclRefExpr(DeclRefExpr *DRE); 68 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 69 bool VisitLambdaExpr(LambdaExpr *Lambda); 70 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); 71 }; 72 73 /// VisitExpr - Visit all of the children of this expression. 74 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 75 bool IsInvalid = false; 76 for (Stmt::child_range I = Node->children(); I; ++I) 77 IsInvalid |= Visit(*I); 78 return IsInvalid; 79 } 80 81 /// VisitDeclRefExpr - Visit a reference to a declaration, to 82 /// determine whether this declaration can be used in the default 83 /// argument expression. 84 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 85 NamedDecl *Decl = DRE->getDecl(); 86 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 87 // C++ [dcl.fct.default]p9 88 // Default arguments are evaluated each time the function is 89 // called. The order of evaluation of function arguments is 90 // unspecified. Consequently, parameters of a function shall not 91 // be used in default argument expressions, even if they are not 92 // evaluated. Parameters of a function declared before a default 93 // argument expression are in scope and can hide namespace and 94 // class member names. 95 return S->Diag(DRE->getLocStart(), 96 diag::err_param_default_argument_references_param) 97 << Param->getDeclName() << DefaultArg->getSourceRange(); 98 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 99 // C++ [dcl.fct.default]p7 100 // Local variables shall not be used in default argument 101 // expressions. 102 if (VDecl->isLocalVarDecl()) 103 return S->Diag(DRE->getLocStart(), 104 diag::err_param_default_argument_references_local) 105 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 106 } 107 108 return false; 109 } 110 111 /// VisitCXXThisExpr - Visit a C++ "this" expression. 112 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 113 // C++ [dcl.fct.default]p8: 114 // The keyword this shall not be used in a default argument of a 115 // member function. 116 return S->Diag(ThisE->getLocStart(), 117 diag::err_param_default_argument_references_this) 118 << ThisE->getSourceRange(); 119 } 120 121 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { 122 bool Invalid = false; 123 for (PseudoObjectExpr::semantics_iterator 124 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { 125 Expr *E = *i; 126 127 // Look through bindings. 128 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { 129 E = OVE->getSourceExpr(); 130 assert(E && "pseudo-object binding without source expression?"); 131 } 132 133 Invalid |= Visit(E); 134 } 135 return Invalid; 136 } 137 138 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 139 // C++11 [expr.lambda.prim]p13: 140 // A lambda-expression appearing in a default argument shall not 141 // implicitly or explicitly capture any entity. 142 if (Lambda->capture_begin() == Lambda->capture_end()) 143 return false; 144 145 return S->Diag(Lambda->getLocStart(), 146 diag::err_lambda_capture_default_arg); 147 } 148} 149 150void 151Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 152 const CXXMethodDecl *Method) { 153 // If we have an MSAny spec already, don't bother. 154 if (!Method || ComputedEST == EST_MSAny) 155 return; 156 157 const FunctionProtoType *Proto 158 = Method->getType()->getAs<FunctionProtoType>(); 159 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 160 if (!Proto) 161 return; 162 163 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 164 165 // If this function can throw any exceptions, make a note of that. 166 if (EST == EST_MSAny || EST == EST_None) { 167 ClearExceptions(); 168 ComputedEST = EST; 169 return; 170 } 171 172 // FIXME: If the call to this decl is using any of its default arguments, we 173 // need to search them for potentially-throwing calls. 174 175 // If this function has a basic noexcept, it doesn't affect the outcome. 176 if (EST == EST_BasicNoexcept) 177 return; 178 179 // If we have a throw-all spec at this point, ignore the function. 180 if (ComputedEST == EST_None) 181 return; 182 183 // If we're still at noexcept(true) and there's a nothrow() callee, 184 // change to that specification. 185 if (EST == EST_DynamicNone) { 186 if (ComputedEST == EST_BasicNoexcept) 187 ComputedEST = EST_DynamicNone; 188 return; 189 } 190 191 // Check out noexcept specs. 192 if (EST == EST_ComputedNoexcept) { 193 FunctionProtoType::NoexceptResult NR = 194 Proto->getNoexceptSpec(Self->Context); 195 assert(NR != FunctionProtoType::NR_NoNoexcept && 196 "Must have noexcept result for EST_ComputedNoexcept."); 197 assert(NR != FunctionProtoType::NR_Dependent && 198 "Should not generate implicit declarations for dependent cases, " 199 "and don't know how to handle them anyway."); 200 201 // noexcept(false) -> no spec on the new function 202 if (NR == FunctionProtoType::NR_Throw) { 203 ClearExceptions(); 204 ComputedEST = EST_None; 205 } 206 // noexcept(true) won't change anything either. 207 return; 208 } 209 210 assert(EST == EST_Dynamic && "EST case not considered earlier."); 211 assert(ComputedEST != EST_None && 212 "Shouldn't collect exceptions when throw-all is guaranteed."); 213 ComputedEST = EST_Dynamic; 214 // Record the exceptions in this function's exception specification. 215 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 216 EEnd = Proto->exception_end(); 217 E != EEnd; ++E) 218 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 219 Exceptions.push_back(*E); 220} 221 222void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 223 if (!E || ComputedEST == EST_MSAny) 224 return; 225 226 // FIXME: 227 // 228 // C++0x [except.spec]p14: 229 // [An] implicit exception-specification specifies the type-id T if and 230 // only if T is allowed by the exception-specification of a function directly 231 // invoked by f's implicit definition; f shall allow all exceptions if any 232 // function it directly invokes allows all exceptions, and f shall allow no 233 // exceptions if every function it directly invokes allows no exceptions. 234 // 235 // Note in particular that if an implicit exception-specification is generated 236 // for a function containing a throw-expression, that specification can still 237 // be noexcept(true). 238 // 239 // Note also that 'directly invoked' is not defined in the standard, and there 240 // is no indication that we should only consider potentially-evaluated calls. 241 // 242 // Ultimately we should implement the intent of the standard: the exception 243 // specification should be the set of exceptions which can be thrown by the 244 // implicit definition. For now, we assume that any non-nothrow expression can 245 // throw any exception. 246 247 if (Self->canThrow(E)) 248 ComputedEST = EST_None; 249} 250 251bool 252Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 253 SourceLocation EqualLoc) { 254 if (RequireCompleteType(Param->getLocation(), Param->getType(), 255 diag::err_typecheck_decl_incomplete_type)) { 256 Param->setInvalidDecl(); 257 return true; 258 } 259 260 // C++ [dcl.fct.default]p5 261 // A default argument expression is implicitly converted (clause 262 // 4) to the parameter type. The default argument expression has 263 // the same semantic constraints as the initializer expression in 264 // a declaration of a variable of the parameter type, using the 265 // copy-initialization semantics (8.5). 266 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 267 Param); 268 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 269 EqualLoc); 270 InitializationSequence InitSeq(*this, Entity, Kind, Arg); 271 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 272 if (Result.isInvalid()) 273 return true; 274 Arg = Result.takeAs<Expr>(); 275 276 CheckCompletedExpr(Arg, EqualLoc); 277 Arg = MaybeCreateExprWithCleanups(Arg); 278 279 // Okay: add the default argument to the parameter 280 Param->setDefaultArg(Arg); 281 282 // We have already instantiated this parameter; provide each of the 283 // instantiations with the uninstantiated default argument. 284 UnparsedDefaultArgInstantiationsMap::iterator InstPos 285 = UnparsedDefaultArgInstantiations.find(Param); 286 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 287 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 288 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 289 290 // We're done tracking this parameter's instantiations. 291 UnparsedDefaultArgInstantiations.erase(InstPos); 292 } 293 294 return false; 295} 296 297/// ActOnParamDefaultArgument - Check whether the default argument 298/// provided for a function parameter is well-formed. If so, attach it 299/// to the parameter declaration. 300void 301Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 302 Expr *DefaultArg) { 303 if (!param || !DefaultArg) 304 return; 305 306 ParmVarDecl *Param = cast<ParmVarDecl>(param); 307 UnparsedDefaultArgLocs.erase(Param); 308 309 // Default arguments are only permitted in C++ 310 if (!getLangOpts().CPlusPlus) { 311 Diag(EqualLoc, diag::err_param_default_argument) 312 << DefaultArg->getSourceRange(); 313 Param->setInvalidDecl(); 314 return; 315 } 316 317 // Check for unexpanded parameter packs. 318 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 319 Param->setInvalidDecl(); 320 return; 321 } 322 323 // Check that the default argument is well-formed 324 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 325 if (DefaultArgChecker.Visit(DefaultArg)) { 326 Param->setInvalidDecl(); 327 return; 328 } 329 330 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 331} 332 333/// ActOnParamUnparsedDefaultArgument - We've seen a default 334/// argument for a function parameter, but we can't parse it yet 335/// because we're inside a class definition. Note that this default 336/// argument will be parsed later. 337void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 338 SourceLocation EqualLoc, 339 SourceLocation ArgLoc) { 340 if (!param) 341 return; 342 343 ParmVarDecl *Param = cast<ParmVarDecl>(param); 344 Param->setUnparsedDefaultArg(); 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 Param->setInvalidDecl(); 356 UnparsedDefaultArgLocs.erase(Param); 357} 358 359/// CheckExtraCXXDefaultArguments - Check for any extra default 360/// arguments in the declarator, which is not a function declaration 361/// or definition and therefore is not permitted to have default 362/// arguments. This routine should be invoked for every declarator 363/// that is not a function declaration or definition. 364void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 365 // C++ [dcl.fct.default]p3 366 // A default argument expression shall be specified only in the 367 // parameter-declaration-clause of a function declaration or in a 368 // template-parameter (14.1). It shall not be specified for a 369 // parameter pack. If it is specified in a 370 // parameter-declaration-clause, it shall not occur within a 371 // declarator or abstract-declarator of a parameter-declaration. 372 bool MightBeFunction = D.isFunctionDeclarationContext(); 373 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 374 DeclaratorChunk &chunk = D.getTypeObject(i); 375 if (chunk.Kind == DeclaratorChunk::Function) { 376 if (MightBeFunction) { 377 // This is a function declaration. It can have default arguments, but 378 // keep looking in case its return type is a function type with default 379 // arguments. 380 MightBeFunction = false; 381 continue; 382 } 383 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 384 ParmVarDecl *Param = 385 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 386 if (Param->hasUnparsedDefaultArg()) { 387 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 388 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 389 << SourceRange((*Toks)[1].getLocation(), 390 Toks->back().getLocation()); 391 delete Toks; 392 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 393 } else if (Param->getDefaultArg()) { 394 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 395 << Param->getDefaultArg()->getSourceRange(); 396 Param->setDefaultArg(0); 397 } 398 } 399 } else if (chunk.Kind != DeclaratorChunk::Paren) { 400 MightBeFunction = false; 401 } 402 } 403} 404 405static bool functionDeclHasDefaultArgument(const FunctionDecl *FD) { 406 for (unsigned NumParams = FD->getNumParams(); NumParams > 0; --NumParams) { 407 const ParmVarDecl *PVD = FD->getParamDecl(NumParams-1); 408 if (!PVD->hasDefaultArg()) 409 return false; 410 if (!PVD->hasInheritedDefaultArg()) 411 return true; 412 } 413 return false; 414} 415 416/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 417/// function, once we already know that they have the same 418/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 419/// error, false otherwise. 420bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 421 Scope *S) { 422 bool Invalid = false; 423 424 // C++ [dcl.fct.default]p4: 425 // For non-template functions, default arguments can be added in 426 // later declarations of a function in the same 427 // scope. Declarations in different scopes have completely 428 // distinct sets of default arguments. That is, declarations in 429 // inner scopes do not acquire default arguments from 430 // declarations in outer scopes, and vice versa. In a given 431 // function declaration, all parameters subsequent to a 432 // parameter with a default argument shall have default 433 // arguments supplied in this or previous declarations. A 434 // default argument shall not be redefined by a later 435 // declaration (not even to the same value). 436 // 437 // C++ [dcl.fct.default]p6: 438 // Except for member functions of class templates, the default arguments 439 // in a member function definition that appears outside of the class 440 // definition are added to the set of default arguments provided by the 441 // member function declaration in the class definition. 442 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 443 ParmVarDecl *OldParam = Old->getParamDecl(p); 444 ParmVarDecl *NewParam = New->getParamDecl(p); 445 446 bool OldParamHasDfl = OldParam->hasDefaultArg(); 447 bool NewParamHasDfl = NewParam->hasDefaultArg(); 448 449 NamedDecl *ND = Old; 450 451 // The declaration context corresponding to the scope is the semantic 452 // parent, unless this is a local function declaration, in which case 453 // it is that surrounding function. 454 DeclContext *ScopeDC = New->getLexicalDeclContext(); 455 if (!ScopeDC->isFunctionOrMethod()) 456 ScopeDC = New->getDeclContext(); 457 if (S && !isDeclInScope(ND, ScopeDC, S) && 458 !New->getDeclContext()->isRecord()) 459 // Ignore default parameters of old decl if they are not in 460 // the same scope and this is not an out-of-line definition of 461 // a member function. 462 OldParamHasDfl = false; 463 464 if (OldParamHasDfl && NewParamHasDfl) { 465 466 unsigned DiagDefaultParamID = 467 diag::err_param_default_argument_redefinition; 468 469 // MSVC accepts that default parameters be redefined for member functions 470 // of template class. The new default parameter's value is ignored. 471 Invalid = true; 472 if (getLangOpts().MicrosoftExt) { 473 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 474 if (MD && MD->getParent()->getDescribedClassTemplate()) { 475 // Merge the old default argument into the new parameter. 476 NewParam->setHasInheritedDefaultArg(); 477 if (OldParam->hasUninstantiatedDefaultArg()) 478 NewParam->setUninstantiatedDefaultArg( 479 OldParam->getUninstantiatedDefaultArg()); 480 else 481 NewParam->setDefaultArg(OldParam->getInit()); 482 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 483 Invalid = false; 484 } 485 } 486 487 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 488 // hint here. Alternatively, we could walk the type-source information 489 // for NewParam to find the last source location in the type... but it 490 // isn't worth the effort right now. This is the kind of test case that 491 // is hard to get right: 492 // int f(int); 493 // void g(int (*fp)(int) = f); 494 // void g(int (*fp)(int) = &f); 495 Diag(NewParam->getLocation(), DiagDefaultParamID) 496 << NewParam->getDefaultArgRange(); 497 498 // Look for the function declaration where the default argument was 499 // actually written, which may be a declaration prior to Old. 500 for (FunctionDecl *Older = Old->getPreviousDecl(); 501 Older; Older = Older->getPreviousDecl()) { 502 if (!Older->getParamDecl(p)->hasDefaultArg()) 503 break; 504 505 OldParam = Older->getParamDecl(p); 506 } 507 508 Diag(OldParam->getLocation(), diag::note_previous_definition) 509 << OldParam->getDefaultArgRange(); 510 } else if (OldParamHasDfl) { 511 // Merge the old default argument into the new parameter. 512 // It's important to use getInit() here; getDefaultArg() 513 // strips off any top-level ExprWithCleanups. 514 NewParam->setHasInheritedDefaultArg(); 515 if (OldParam->hasUninstantiatedDefaultArg()) 516 NewParam->setUninstantiatedDefaultArg( 517 OldParam->getUninstantiatedDefaultArg()); 518 else 519 NewParam->setDefaultArg(OldParam->getInit()); 520 } else if (NewParamHasDfl) { 521 if (New->getDescribedFunctionTemplate()) { 522 // Paragraph 4, quoted above, only applies to non-template functions. 523 Diag(NewParam->getLocation(), 524 diag::err_param_default_argument_template_redecl) 525 << NewParam->getDefaultArgRange(); 526 Diag(Old->getLocation(), diag::note_template_prev_declaration) 527 << false; 528 } else if (New->getTemplateSpecializationKind() 529 != TSK_ImplicitInstantiation && 530 New->getTemplateSpecializationKind() != TSK_Undeclared) { 531 // C++ [temp.expr.spec]p21: 532 // Default function arguments shall not be specified in a declaration 533 // or a definition for one of the following explicit specializations: 534 // - the explicit specialization of a function template; 535 // - the explicit specialization of a member function template; 536 // - the explicit specialization of a member function of a class 537 // template where the class template specialization to which the 538 // member function specialization belongs is implicitly 539 // instantiated. 540 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 541 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 542 << New->getDeclName() 543 << NewParam->getDefaultArgRange(); 544 } else if (New->getDeclContext()->isDependentContext()) { 545 // C++ [dcl.fct.default]p6 (DR217): 546 // Default arguments for a member function of a class template shall 547 // be specified on the initial declaration of the member function 548 // within the class template. 549 // 550 // Reading the tea leaves a bit in DR217 and its reference to DR205 551 // leads me to the conclusion that one cannot add default function 552 // arguments for an out-of-line definition of a member function of a 553 // dependent type. 554 int WhichKind = 2; 555 if (CXXRecordDecl *Record 556 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 557 if (Record->getDescribedClassTemplate()) 558 WhichKind = 0; 559 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 560 WhichKind = 1; 561 else 562 WhichKind = 2; 563 } 564 565 Diag(NewParam->getLocation(), 566 diag::err_param_default_argument_member_template_redecl) 567 << WhichKind 568 << NewParam->getDefaultArgRange(); 569 } 570 } 571 } 572 573 // DR1344: If a default argument is added outside a class definition and that 574 // default argument makes the function a special member function, the program 575 // is ill-formed. This can only happen for constructors. 576 if (isa<CXXConstructorDecl>(New) && 577 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 578 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 579 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 580 if (NewSM != OldSM) { 581 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 582 assert(NewParam->hasDefaultArg()); 583 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 584 << NewParam->getDefaultArgRange() << NewSM; 585 Diag(Old->getLocation(), diag::note_previous_declaration); 586 } 587 } 588 589 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 590 // template has a constexpr specifier then all its declarations shall 591 // contain the constexpr specifier. 592 if (New->isConstexpr() != Old->isConstexpr()) { 593 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 594 << New << New->isConstexpr(); 595 Diag(Old->getLocation(), diag::note_previous_declaration); 596 Invalid = true; 597 } 598 599 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a default 600 // argument expression, that declaration shall be a definition and shall be 601 // the only declaration of the function or function template in the 602 // translation unit. 603 if (Old->getFriendObjectKind() == Decl::FOK_Undeclared && 604 functionDeclHasDefaultArgument(Old)) { 605 Diag(New->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 606 Diag(Old->getLocation(), diag::note_previous_declaration); 607 Invalid = true; 608 } 609 610 if (CheckEquivalentExceptionSpec(Old, New)) 611 Invalid = true; 612 613 return Invalid; 614} 615 616/// \brief Merge the exception specifications of two variable declarations. 617/// 618/// This is called when there's a redeclaration of a VarDecl. The function 619/// checks if the redeclaration might have an exception specification and 620/// validates compatibility and merges the specs if necessary. 621void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 622 // Shortcut if exceptions are disabled. 623 if (!getLangOpts().CXXExceptions) 624 return; 625 626 assert(Context.hasSameType(New->getType(), Old->getType()) && 627 "Should only be called if types are otherwise the same."); 628 629 QualType NewType = New->getType(); 630 QualType OldType = Old->getType(); 631 632 // We're only interested in pointers and references to functions, as well 633 // as pointers to member functions. 634 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 635 NewType = R->getPointeeType(); 636 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 637 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 638 NewType = P->getPointeeType(); 639 OldType = OldType->getAs<PointerType>()->getPointeeType(); 640 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 641 NewType = M->getPointeeType(); 642 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 643 } 644 645 if (!NewType->isFunctionProtoType()) 646 return; 647 648 // There's lots of special cases for functions. For function pointers, system 649 // libraries are hopefully not as broken so that we don't need these 650 // workarounds. 651 if (CheckEquivalentExceptionSpec( 652 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 653 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 654 New->setInvalidDecl(); 655 } 656} 657 658/// CheckCXXDefaultArguments - Verify that the default arguments for a 659/// function declaration are well-formed according to C++ 660/// [dcl.fct.default]. 661void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 662 unsigned NumParams = FD->getNumParams(); 663 unsigned p; 664 665 // Find first parameter with a default argument 666 for (p = 0; p < NumParams; ++p) { 667 ParmVarDecl *Param = FD->getParamDecl(p); 668 if (Param->hasDefaultArg()) 669 break; 670 } 671 672 // C++ [dcl.fct.default]p4: 673 // In a given function declaration, all parameters 674 // subsequent to a parameter with a default argument shall 675 // have default arguments supplied in this or previous 676 // declarations. A default argument shall not be redefined 677 // by a later declaration (not even to the same value). 678 unsigned LastMissingDefaultArg = 0; 679 for (; p < NumParams; ++p) { 680 ParmVarDecl *Param = FD->getParamDecl(p); 681 if (!Param->hasDefaultArg()) { 682 if (Param->isInvalidDecl()) 683 /* We already complained about this parameter. */; 684 else if (Param->getIdentifier()) 685 Diag(Param->getLocation(), 686 diag::err_param_default_argument_missing_name) 687 << Param->getIdentifier(); 688 else 689 Diag(Param->getLocation(), 690 diag::err_param_default_argument_missing); 691 692 LastMissingDefaultArg = p; 693 } 694 } 695 696 if (LastMissingDefaultArg > 0) { 697 // Some default arguments were missing. Clear out all of the 698 // default arguments up to (and including) the last missing 699 // default argument, so that we leave the function parameters 700 // in a semantically valid state. 701 for (p = 0; p <= LastMissingDefaultArg; ++p) { 702 ParmVarDecl *Param = FD->getParamDecl(p); 703 if (Param->hasDefaultArg()) { 704 Param->setDefaultArg(0); 705 } 706 } 707 } 708} 709 710// CheckConstexprParameterTypes - Check whether a function's parameter types 711// are all literal types. If so, return true. If not, produce a suitable 712// diagnostic and return false. 713static bool CheckConstexprParameterTypes(Sema &SemaRef, 714 const FunctionDecl *FD) { 715 unsigned ArgIndex = 0; 716 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 717 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 718 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 719 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 720 SourceLocation ParamLoc = PD->getLocation(); 721 if (!(*i)->isDependentType() && 722 SemaRef.RequireLiteralType(ParamLoc, *i, 723 diag::err_constexpr_non_literal_param, 724 ArgIndex+1, PD->getSourceRange(), 725 isa<CXXConstructorDecl>(FD))) 726 return false; 727 } 728 return true; 729} 730 731/// \brief Get diagnostic %select index for tag kind for 732/// record diagnostic message. 733/// WARNING: Indexes apply to particular diagnostics only! 734/// 735/// \returns diagnostic %select index. 736static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 737 switch (Tag) { 738 case TTK_Struct: return 0; 739 case TTK_Interface: return 1; 740 case TTK_Class: return 2; 741 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 742 } 743} 744 745// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 746// the requirements of a constexpr function definition or a constexpr 747// constructor definition. If so, return true. If not, produce appropriate 748// diagnostics and return false. 749// 750// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 751bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 752 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 753 if (MD && MD->isInstance()) { 754 // C++11 [dcl.constexpr]p4: 755 // The definition of a constexpr constructor shall satisfy the following 756 // constraints: 757 // - the class shall not have any virtual base classes; 758 const CXXRecordDecl *RD = MD->getParent(); 759 if (RD->getNumVBases()) { 760 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 761 << isa<CXXConstructorDecl>(NewFD) 762 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 763 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 764 E = RD->vbases_end(); I != E; ++I) 765 Diag(I->getLocStart(), 766 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 767 return false; 768 } 769 } 770 771 if (!isa<CXXConstructorDecl>(NewFD)) { 772 // C++11 [dcl.constexpr]p3: 773 // The definition of a constexpr function shall satisfy the following 774 // constraints: 775 // - it shall not be virtual; 776 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 777 if (Method && Method->isVirtual()) { 778 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 779 780 // If it's not obvious why this function is virtual, find an overridden 781 // function which uses the 'virtual' keyword. 782 const CXXMethodDecl *WrittenVirtual = Method; 783 while (!WrittenVirtual->isVirtualAsWritten()) 784 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 785 if (WrittenVirtual != Method) 786 Diag(WrittenVirtual->getLocation(), 787 diag::note_overridden_virtual_function); 788 return false; 789 } 790 791 // - its return type shall be a literal type; 792 QualType RT = NewFD->getResultType(); 793 if (!RT->isDependentType() && 794 RequireLiteralType(NewFD->getLocation(), RT, 795 diag::err_constexpr_non_literal_return)) 796 return false; 797 } 798 799 // - each of its parameter types shall be a literal type; 800 if (!CheckConstexprParameterTypes(*this, NewFD)) 801 return false; 802 803 return true; 804} 805 806/// Check the given declaration statement is legal within a constexpr function 807/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. 808/// 809/// \return true if the body is OK (maybe only as an extension), false if we 810/// have diagnosed a problem. 811static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 812 DeclStmt *DS, SourceLocation &Cxx1yLoc) { 813 // C++11 [dcl.constexpr]p3 and p4: 814 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 815 // contain only 816 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 817 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 818 switch ((*DclIt)->getKind()) { 819 case Decl::StaticAssert: 820 case Decl::Using: 821 case Decl::UsingShadow: 822 case Decl::UsingDirective: 823 case Decl::UnresolvedUsingTypename: 824 case Decl::UnresolvedUsingValue: 825 // - static_assert-declarations 826 // - using-declarations, 827 // - using-directives, 828 continue; 829 830 case Decl::Typedef: 831 case Decl::TypeAlias: { 832 // - typedef declarations and alias-declarations that do not define 833 // classes or enumerations, 834 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 835 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 836 // Don't allow variably-modified types in constexpr functions. 837 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 838 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 839 << TL.getSourceRange() << TL.getType() 840 << isa<CXXConstructorDecl>(Dcl); 841 return false; 842 } 843 continue; 844 } 845 846 case Decl::Enum: 847 case Decl::CXXRecord: 848 // C++1y allows types to be defined, not just declared. 849 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) 850 SemaRef.Diag(DS->getLocStart(), 851 SemaRef.getLangOpts().CPlusPlus1y 852 ? diag::warn_cxx11_compat_constexpr_type_definition 853 : diag::ext_constexpr_type_definition) 854 << isa<CXXConstructorDecl>(Dcl); 855 continue; 856 857 case Decl::EnumConstant: 858 case Decl::IndirectField: 859 case Decl::ParmVar: 860 // These can only appear with other declarations which are banned in 861 // C++11 and permitted in C++1y, so ignore them. 862 continue; 863 864 case Decl::Var: { 865 // C++1y [dcl.constexpr]p3 allows anything except: 866 // a definition of a variable of non-literal type or of static or 867 // thread storage duration or for which no initialization is performed. 868 VarDecl *VD = cast<VarDecl>(*DclIt); 869 if (VD->isThisDeclarationADefinition()) { 870 if (VD->isStaticLocal()) { 871 SemaRef.Diag(VD->getLocation(), 872 diag::err_constexpr_local_var_static) 873 << isa<CXXConstructorDecl>(Dcl) 874 << (VD->getTLSKind() == VarDecl::TLS_Dynamic); 875 return false; 876 } 877 if (!VD->getType()->isDependentType() && 878 SemaRef.RequireLiteralType( 879 VD->getLocation(), VD->getType(), 880 diag::err_constexpr_local_var_non_literal_type, 881 isa<CXXConstructorDecl>(Dcl))) 882 return false; 883 if (!VD->hasInit()) { 884 SemaRef.Diag(VD->getLocation(), 885 diag::err_constexpr_local_var_no_init) 886 << isa<CXXConstructorDecl>(Dcl); 887 return false; 888 } 889 } 890 SemaRef.Diag(VD->getLocation(), 891 SemaRef.getLangOpts().CPlusPlus1y 892 ? diag::warn_cxx11_compat_constexpr_local_var 893 : diag::ext_constexpr_local_var) 894 << isa<CXXConstructorDecl>(Dcl); 895 continue; 896 } 897 898 case Decl::NamespaceAlias: 899 case Decl::Function: 900 // These are disallowed in C++11 and permitted in C++1y. Allow them 901 // everywhere as an extension. 902 if (!Cxx1yLoc.isValid()) 903 Cxx1yLoc = DS->getLocStart(); 904 continue; 905 906 default: 907 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 908 << isa<CXXConstructorDecl>(Dcl); 909 return false; 910 } 911 } 912 913 return true; 914} 915 916/// Check that the given field is initialized within a constexpr constructor. 917/// 918/// \param Dcl The constexpr constructor being checked. 919/// \param Field The field being checked. This may be a member of an anonymous 920/// struct or union nested within the class being checked. 921/// \param Inits All declarations, including anonymous struct/union members and 922/// indirect members, for which any initialization was provided. 923/// \param Diagnosed Set to true if an error is produced. 924static void CheckConstexprCtorInitializer(Sema &SemaRef, 925 const FunctionDecl *Dcl, 926 FieldDecl *Field, 927 llvm::SmallSet<Decl*, 16> &Inits, 928 bool &Diagnosed) { 929 if (Field->isInvalidDecl()) 930 return; 931 932 if (Field->isUnnamedBitfield()) 933 return; 934 935 if (Field->isAnonymousStructOrUnion() && 936 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 937 return; 938 939 if (!Inits.count(Field)) { 940 if (!Diagnosed) { 941 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 942 Diagnosed = true; 943 } 944 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 945 } else if (Field->isAnonymousStructOrUnion()) { 946 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 947 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 948 I != E; ++I) 949 // If an anonymous union contains an anonymous struct of which any member 950 // is initialized, all members must be initialized. 951 if (!RD->isUnion() || Inits.count(*I)) 952 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 953 } 954} 955 956/// Check the provided statement is allowed in a constexpr function 957/// definition. 958static bool 959CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, 960 SmallVectorImpl<SourceLocation> &ReturnStmts, 961 SourceLocation &Cxx1yLoc) { 962 // - its function-body shall be [...] a compound-statement that contains only 963 switch (S->getStmtClass()) { 964 case Stmt::NullStmtClass: 965 // - null statements, 966 return true; 967 968 case Stmt::DeclStmtClass: 969 // - static_assert-declarations 970 // - using-declarations, 971 // - using-directives, 972 // - typedef declarations and alias-declarations that do not define 973 // classes or enumerations, 974 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc)) 975 return false; 976 return true; 977 978 case Stmt::ReturnStmtClass: 979 // - and exactly one return statement; 980 if (isa<CXXConstructorDecl>(Dcl)) { 981 // C++1y allows return statements in constexpr constructors. 982 if (!Cxx1yLoc.isValid()) 983 Cxx1yLoc = S->getLocStart(); 984 return true; 985 } 986 987 ReturnStmts.push_back(S->getLocStart()); 988 return true; 989 990 case Stmt::CompoundStmtClass: { 991 // C++1y allows compound-statements. 992 if (!Cxx1yLoc.isValid()) 993 Cxx1yLoc = S->getLocStart(); 994 995 CompoundStmt *CompStmt = cast<CompoundStmt>(S); 996 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(), 997 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) { 998 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts, 999 Cxx1yLoc)) 1000 return false; 1001 } 1002 return true; 1003 } 1004 1005 case Stmt::AttributedStmtClass: 1006 if (!Cxx1yLoc.isValid()) 1007 Cxx1yLoc = S->getLocStart(); 1008 return true; 1009 1010 case Stmt::IfStmtClass: { 1011 // C++1y allows if-statements. 1012 if (!Cxx1yLoc.isValid()) 1013 Cxx1yLoc = S->getLocStart(); 1014 1015 IfStmt *If = cast<IfStmt>(S); 1016 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, 1017 Cxx1yLoc)) 1018 return false; 1019 if (If->getElse() && 1020 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, 1021 Cxx1yLoc)) 1022 return false; 1023 return true; 1024 } 1025 1026 case Stmt::WhileStmtClass: 1027 case Stmt::DoStmtClass: 1028 case Stmt::ForStmtClass: 1029 case Stmt::CXXForRangeStmtClass: 1030 case Stmt::ContinueStmtClass: 1031 // C++1y allows all of these. We don't allow them as extensions in C++11, 1032 // because they don't make sense without variable mutation. 1033 if (!SemaRef.getLangOpts().CPlusPlus1y) 1034 break; 1035 if (!Cxx1yLoc.isValid()) 1036 Cxx1yLoc = S->getLocStart(); 1037 for (Stmt::child_range Children = S->children(); Children; ++Children) 1038 if (*Children && 1039 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1040 Cxx1yLoc)) 1041 return false; 1042 return true; 1043 1044 case Stmt::SwitchStmtClass: 1045 case Stmt::CaseStmtClass: 1046 case Stmt::DefaultStmtClass: 1047 case Stmt::BreakStmtClass: 1048 // C++1y allows switch-statements, and since they don't need variable 1049 // mutation, we can reasonably allow them in C++11 as an extension. 1050 if (!Cxx1yLoc.isValid()) 1051 Cxx1yLoc = S->getLocStart(); 1052 for (Stmt::child_range Children = S->children(); Children; ++Children) 1053 if (*Children && 1054 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1055 Cxx1yLoc)) 1056 return false; 1057 return true; 1058 1059 default: 1060 if (!isa<Expr>(S)) 1061 break; 1062 1063 // C++1y allows expression-statements. 1064 if (!Cxx1yLoc.isValid()) 1065 Cxx1yLoc = S->getLocStart(); 1066 return true; 1067 } 1068 1069 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt) 1070 << isa<CXXConstructorDecl>(Dcl); 1071 return false; 1072} 1073 1074/// Check the body for the given constexpr function declaration only contains 1075/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 1076/// 1077/// \return true if the body is OK, false if we have diagnosed a problem. 1078bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 1079 if (isa<CXXTryStmt>(Body)) { 1080 // C++11 [dcl.constexpr]p3: 1081 // The definition of a constexpr function shall satisfy the following 1082 // constraints: [...] 1083 // - its function-body shall be = delete, = default, or a 1084 // compound-statement 1085 // 1086 // C++11 [dcl.constexpr]p4: 1087 // In the definition of a constexpr constructor, [...] 1088 // - its function-body shall not be a function-try-block; 1089 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 1090 << isa<CXXConstructorDecl>(Dcl); 1091 return false; 1092 } 1093 1094 SmallVector<SourceLocation, 4> ReturnStmts; 1095 1096 // - its function-body shall be [...] a compound-statement that contains only 1097 // [... list of cases ...] 1098 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 1099 SourceLocation Cxx1yLoc; 1100 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 1101 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 1102 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc)) 1103 return false; 1104 } 1105 1106 if (Cxx1yLoc.isValid()) 1107 Diag(Cxx1yLoc, 1108 getLangOpts().CPlusPlus1y 1109 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt 1110 : diag::ext_constexpr_body_invalid_stmt) 1111 << isa<CXXConstructorDecl>(Dcl); 1112 1113 if (const CXXConstructorDecl *Constructor 1114 = dyn_cast<CXXConstructorDecl>(Dcl)) { 1115 const CXXRecordDecl *RD = Constructor->getParent(); 1116 // DR1359: 1117 // - every non-variant non-static data member and base class sub-object 1118 // shall be initialized; 1119 // - if the class is a non-empty union, or for each non-empty anonymous 1120 // union member of a non-union class, exactly one non-static data member 1121 // shall be initialized; 1122 if (RD->isUnion()) { 1123 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 1124 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 1125 return false; 1126 } 1127 } else if (!Constructor->isDependentContext() && 1128 !Constructor->isDelegatingConstructor()) { 1129 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 1130 1131 // Skip detailed checking if we have enough initializers, and we would 1132 // allow at most one initializer per member. 1133 bool AnyAnonStructUnionMembers = false; 1134 unsigned Fields = 0; 1135 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1136 E = RD->field_end(); I != E; ++I, ++Fields) { 1137 if (I->isAnonymousStructOrUnion()) { 1138 AnyAnonStructUnionMembers = true; 1139 break; 1140 } 1141 } 1142 if (AnyAnonStructUnionMembers || 1143 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 1144 // Check initialization of non-static data members. Base classes are 1145 // always initialized so do not need to be checked. Dependent bases 1146 // might not have initializers in the member initializer list. 1147 llvm::SmallSet<Decl*, 16> Inits; 1148 for (CXXConstructorDecl::init_const_iterator 1149 I = Constructor->init_begin(), E = Constructor->init_end(); 1150 I != E; ++I) { 1151 if (FieldDecl *FD = (*I)->getMember()) 1152 Inits.insert(FD); 1153 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 1154 Inits.insert(ID->chain_begin(), ID->chain_end()); 1155 } 1156 1157 bool Diagnosed = false; 1158 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1159 E = RD->field_end(); I != E; ++I) 1160 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 1161 if (Diagnosed) 1162 return false; 1163 } 1164 } 1165 } else { 1166 if (ReturnStmts.empty()) { 1167 // C++1y doesn't require constexpr functions to contain a 'return' 1168 // statement. We still do, unless the return type is void, because 1169 // otherwise if there's no return statement, the function cannot 1170 // be used in a core constant expression. 1171 bool OK = getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType(); 1172 Diag(Dcl->getLocation(), 1173 OK ? diag::warn_cxx11_compat_constexpr_body_no_return 1174 : diag::err_constexpr_body_no_return); 1175 return OK; 1176 } 1177 if (ReturnStmts.size() > 1) { 1178 Diag(ReturnStmts.back(), 1179 getLangOpts().CPlusPlus1y 1180 ? diag::warn_cxx11_compat_constexpr_body_multiple_return 1181 : diag::ext_constexpr_body_multiple_return); 1182 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 1183 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 1184 } 1185 } 1186 1187 // C++11 [dcl.constexpr]p5: 1188 // if no function argument values exist such that the function invocation 1189 // substitution would produce a constant expression, the program is 1190 // ill-formed; no diagnostic required. 1191 // C++11 [dcl.constexpr]p3: 1192 // - every constructor call and implicit conversion used in initializing the 1193 // return value shall be one of those allowed in a constant expression. 1194 // C++11 [dcl.constexpr]p4: 1195 // - every constructor involved in initializing non-static data members and 1196 // base class sub-objects shall be a constexpr constructor. 1197 SmallVector<PartialDiagnosticAt, 8> Diags; 1198 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1199 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1200 << isa<CXXConstructorDecl>(Dcl); 1201 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1202 Diag(Diags[I].first, Diags[I].second); 1203 // Don't return false here: we allow this for compatibility in 1204 // system headers. 1205 } 1206 1207 return true; 1208} 1209 1210/// isCurrentClassName - Determine whether the identifier II is the 1211/// name of the class type currently being defined. In the case of 1212/// nested classes, this will only return true if II is the name of 1213/// the innermost class. 1214bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1215 const CXXScopeSpec *SS) { 1216 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1217 1218 CXXRecordDecl *CurDecl; 1219 if (SS && SS->isSet() && !SS->isInvalid()) { 1220 DeclContext *DC = computeDeclContext(*SS, true); 1221 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1222 } else 1223 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1224 1225 if (CurDecl && CurDecl->getIdentifier()) 1226 return &II == CurDecl->getIdentifier(); 1227 return false; 1228} 1229 1230/// \brief Determine whether the given class is a base class of the given 1231/// class, including looking at dependent bases. 1232static bool findCircularInheritance(const CXXRecordDecl *Class, 1233 const CXXRecordDecl *Current) { 1234 SmallVector<const CXXRecordDecl*, 8> Queue; 1235 1236 Class = Class->getCanonicalDecl(); 1237 while (true) { 1238 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1239 E = Current->bases_end(); 1240 I != E; ++I) { 1241 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1242 if (!Base) 1243 continue; 1244 1245 Base = Base->getDefinition(); 1246 if (!Base) 1247 continue; 1248 1249 if (Base->getCanonicalDecl() == Class) 1250 return true; 1251 1252 Queue.push_back(Base); 1253 } 1254 1255 if (Queue.empty()) 1256 return false; 1257 1258 Current = Queue.pop_back_val(); 1259 } 1260 1261 return false; 1262} 1263 1264/// \brief Check the validity of a C++ base class specifier. 1265/// 1266/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1267/// and returns NULL otherwise. 1268CXXBaseSpecifier * 1269Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1270 SourceRange SpecifierRange, 1271 bool Virtual, AccessSpecifier Access, 1272 TypeSourceInfo *TInfo, 1273 SourceLocation EllipsisLoc) { 1274 QualType BaseType = TInfo->getType(); 1275 1276 // C++ [class.union]p1: 1277 // A union shall not have base classes. 1278 if (Class->isUnion()) { 1279 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1280 << SpecifierRange; 1281 return 0; 1282 } 1283 1284 if (EllipsisLoc.isValid() && 1285 !TInfo->getType()->containsUnexpandedParameterPack()) { 1286 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1287 << TInfo->getTypeLoc().getSourceRange(); 1288 EllipsisLoc = SourceLocation(); 1289 } 1290 1291 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1292 1293 if (BaseType->isDependentType()) { 1294 // Make sure that we don't have circular inheritance among our dependent 1295 // bases. For non-dependent bases, the check for completeness below handles 1296 // this. 1297 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1298 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1299 ((BaseDecl = BaseDecl->getDefinition()) && 1300 findCircularInheritance(Class, BaseDecl))) { 1301 Diag(BaseLoc, diag::err_circular_inheritance) 1302 << BaseType << Context.getTypeDeclType(Class); 1303 1304 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1305 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1306 << BaseType; 1307 1308 return 0; 1309 } 1310 } 1311 1312 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1313 Class->getTagKind() == TTK_Class, 1314 Access, TInfo, EllipsisLoc); 1315 } 1316 1317 // Base specifiers must be record types. 1318 if (!BaseType->isRecordType()) { 1319 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1320 return 0; 1321 } 1322 1323 // C++ [class.union]p1: 1324 // A union shall not be used as a base class. 1325 if (BaseType->isUnionType()) { 1326 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1327 return 0; 1328 } 1329 1330 // C++ [class.derived]p2: 1331 // The class-name in a base-specifier shall not be an incompletely 1332 // defined class. 1333 if (RequireCompleteType(BaseLoc, BaseType, 1334 diag::err_incomplete_base_class, SpecifierRange)) { 1335 Class->setInvalidDecl(); 1336 return 0; 1337 } 1338 1339 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1340 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1341 assert(BaseDecl && "Record type has no declaration"); 1342 BaseDecl = BaseDecl->getDefinition(); 1343 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1344 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1345 assert(CXXBaseDecl && "Base type is not a C++ type"); 1346 1347 // C++ [class]p3: 1348 // If a class is marked final and it appears as a base-type-specifier in 1349 // base-clause, the program is ill-formed. 1350 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1351 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1352 << CXXBaseDecl->getDeclName(); 1353 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1354 << CXXBaseDecl->getDeclName(); 1355 return 0; 1356 } 1357 1358 if (BaseDecl->isInvalidDecl()) 1359 Class->setInvalidDecl(); 1360 1361 // Create the base specifier. 1362 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1363 Class->getTagKind() == TTK_Class, 1364 Access, TInfo, EllipsisLoc); 1365} 1366 1367/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1368/// one entry in the base class list of a class specifier, for 1369/// example: 1370/// class foo : public bar, virtual private baz { 1371/// 'public bar' and 'virtual private baz' are each base-specifiers. 1372BaseResult 1373Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1374 ParsedAttributes &Attributes, 1375 bool Virtual, AccessSpecifier Access, 1376 ParsedType basetype, SourceLocation BaseLoc, 1377 SourceLocation EllipsisLoc) { 1378 if (!classdecl) 1379 return true; 1380 1381 AdjustDeclIfTemplate(classdecl); 1382 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1383 if (!Class) 1384 return true; 1385 1386 // We do not support any C++11 attributes on base-specifiers yet. 1387 // Diagnose any attributes we see. 1388 if (!Attributes.empty()) { 1389 for (AttributeList *Attr = Attributes.getList(); Attr; 1390 Attr = Attr->getNext()) { 1391 if (Attr->isInvalid() || 1392 Attr->getKind() == AttributeList::IgnoredAttribute) 1393 continue; 1394 Diag(Attr->getLoc(), 1395 Attr->getKind() == AttributeList::UnknownAttribute 1396 ? diag::warn_unknown_attribute_ignored 1397 : diag::err_base_specifier_attribute) 1398 << Attr->getName(); 1399 } 1400 } 1401 1402 TypeSourceInfo *TInfo = 0; 1403 GetTypeFromParser(basetype, &TInfo); 1404 1405 if (EllipsisLoc.isInvalid() && 1406 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1407 UPPC_BaseType)) 1408 return true; 1409 1410 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1411 Virtual, Access, TInfo, 1412 EllipsisLoc)) 1413 return BaseSpec; 1414 else 1415 Class->setInvalidDecl(); 1416 1417 return true; 1418} 1419 1420/// \brief Performs the actual work of attaching the given base class 1421/// specifiers to a C++ class. 1422bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1423 unsigned NumBases) { 1424 if (NumBases == 0) 1425 return false; 1426 1427 // Used to keep track of which base types we have already seen, so 1428 // that we can properly diagnose redundant direct base types. Note 1429 // that the key is always the unqualified canonical type of the base 1430 // class. 1431 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1432 1433 // Copy non-redundant base specifiers into permanent storage. 1434 unsigned NumGoodBases = 0; 1435 bool Invalid = false; 1436 for (unsigned idx = 0; idx < NumBases; ++idx) { 1437 QualType NewBaseType 1438 = Context.getCanonicalType(Bases[idx]->getType()); 1439 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1440 1441 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1442 if (KnownBase) { 1443 // C++ [class.mi]p3: 1444 // A class shall not be specified as a direct base class of a 1445 // derived class more than once. 1446 Diag(Bases[idx]->getLocStart(), 1447 diag::err_duplicate_base_class) 1448 << KnownBase->getType() 1449 << Bases[idx]->getSourceRange(); 1450 1451 // Delete the duplicate base class specifier; we're going to 1452 // overwrite its pointer later. 1453 Context.Deallocate(Bases[idx]); 1454 1455 Invalid = true; 1456 } else { 1457 // Okay, add this new base class. 1458 KnownBase = Bases[idx]; 1459 Bases[NumGoodBases++] = Bases[idx]; 1460 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1461 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1462 if (Class->isInterface() && 1463 (!RD->isInterface() || 1464 KnownBase->getAccessSpecifier() != AS_public)) { 1465 // The Microsoft extension __interface does not permit bases that 1466 // are not themselves public interfaces. 1467 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1468 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1469 << RD->getSourceRange(); 1470 Invalid = true; 1471 } 1472 if (RD->hasAttr<WeakAttr>()) 1473 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1474 } 1475 } 1476 } 1477 1478 // Attach the remaining base class specifiers to the derived class. 1479 Class->setBases(Bases, NumGoodBases); 1480 1481 // Delete the remaining (good) base class specifiers, since their 1482 // data has been copied into the CXXRecordDecl. 1483 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1484 Context.Deallocate(Bases[idx]); 1485 1486 return Invalid; 1487} 1488 1489/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1490/// class, after checking whether there are any duplicate base 1491/// classes. 1492void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1493 unsigned NumBases) { 1494 if (!ClassDecl || !Bases || !NumBases) 1495 return; 1496 1497 AdjustDeclIfTemplate(ClassDecl); 1498 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases, NumBases); 1499} 1500 1501/// \brief Determine whether the type \p Derived is a C++ class that is 1502/// derived from the type \p Base. 1503bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1504 if (!getLangOpts().CPlusPlus) 1505 return false; 1506 1507 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1508 if (!DerivedRD) 1509 return false; 1510 1511 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1512 if (!BaseRD) 1513 return false; 1514 1515 // If either the base or the derived type is invalid, don't try to 1516 // check whether one is derived from the other. 1517 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1518 return false; 1519 1520 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1521 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1522} 1523 1524/// \brief Determine whether the type \p Derived is a C++ class that is 1525/// derived from the type \p Base. 1526bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1527 if (!getLangOpts().CPlusPlus) 1528 return false; 1529 1530 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1531 if (!DerivedRD) 1532 return false; 1533 1534 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1535 if (!BaseRD) 1536 return false; 1537 1538 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1539} 1540 1541void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1542 CXXCastPath &BasePathArray) { 1543 assert(BasePathArray.empty() && "Base path array must be empty!"); 1544 assert(Paths.isRecordingPaths() && "Must record paths!"); 1545 1546 const CXXBasePath &Path = Paths.front(); 1547 1548 // We first go backward and check if we have a virtual base. 1549 // FIXME: It would be better if CXXBasePath had the base specifier for 1550 // the nearest virtual base. 1551 unsigned Start = 0; 1552 for (unsigned I = Path.size(); I != 0; --I) { 1553 if (Path[I - 1].Base->isVirtual()) { 1554 Start = I - 1; 1555 break; 1556 } 1557 } 1558 1559 // Now add all bases. 1560 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1561 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1562} 1563 1564/// \brief Determine whether the given base path includes a virtual 1565/// base class. 1566bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1567 for (CXXCastPath::const_iterator B = BasePath.begin(), 1568 BEnd = BasePath.end(); 1569 B != BEnd; ++B) 1570 if ((*B)->isVirtual()) 1571 return true; 1572 1573 return false; 1574} 1575 1576/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1577/// conversion (where Derived and Base are class types) is 1578/// well-formed, meaning that the conversion is unambiguous (and 1579/// that all of the base classes are accessible). Returns true 1580/// and emits a diagnostic if the code is ill-formed, returns false 1581/// otherwise. Loc is the location where this routine should point to 1582/// if there is an error, and Range is the source range to highlight 1583/// if there is an error. 1584bool 1585Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1586 unsigned InaccessibleBaseID, 1587 unsigned AmbigiousBaseConvID, 1588 SourceLocation Loc, SourceRange Range, 1589 DeclarationName Name, 1590 CXXCastPath *BasePath) { 1591 // First, determine whether the path from Derived to Base is 1592 // ambiguous. This is slightly more expensive than checking whether 1593 // the Derived to Base conversion exists, because here we need to 1594 // explore multiple paths to determine if there is an ambiguity. 1595 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1596 /*DetectVirtual=*/false); 1597 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1598 assert(DerivationOkay && 1599 "Can only be used with a derived-to-base conversion"); 1600 (void)DerivationOkay; 1601 1602 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1603 if (InaccessibleBaseID) { 1604 // Check that the base class can be accessed. 1605 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1606 InaccessibleBaseID)) { 1607 case AR_inaccessible: 1608 return true; 1609 case AR_accessible: 1610 case AR_dependent: 1611 case AR_delayed: 1612 break; 1613 } 1614 } 1615 1616 // Build a base path if necessary. 1617 if (BasePath) 1618 BuildBasePathArray(Paths, *BasePath); 1619 return false; 1620 } 1621 1622 if (AmbigiousBaseConvID) { 1623 // We know that the derived-to-base conversion is ambiguous, and 1624 // we're going to produce a diagnostic. Perform the derived-to-base 1625 // search just one more time to compute all of the possible paths so 1626 // that we can print them out. This is more expensive than any of 1627 // the previous derived-to-base checks we've done, but at this point 1628 // performance isn't as much of an issue. 1629 Paths.clear(); 1630 Paths.setRecordingPaths(true); 1631 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1632 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1633 (void)StillOkay; 1634 1635 // Build up a textual representation of the ambiguous paths, e.g., 1636 // D -> B -> A, that will be used to illustrate the ambiguous 1637 // conversions in the diagnostic. We only print one of the paths 1638 // to each base class subobject. 1639 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1640 1641 Diag(Loc, AmbigiousBaseConvID) 1642 << Derived << Base << PathDisplayStr << Range << Name; 1643 } 1644 return true; 1645} 1646 1647bool 1648Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1649 SourceLocation Loc, SourceRange Range, 1650 CXXCastPath *BasePath, 1651 bool IgnoreAccess) { 1652 return CheckDerivedToBaseConversion(Derived, Base, 1653 IgnoreAccess ? 0 1654 : diag::err_upcast_to_inaccessible_base, 1655 diag::err_ambiguous_derived_to_base_conv, 1656 Loc, Range, DeclarationName(), 1657 BasePath); 1658} 1659 1660 1661/// @brief Builds a string representing ambiguous paths from a 1662/// specific derived class to different subobjects of the same base 1663/// class. 1664/// 1665/// This function builds a string that can be used in error messages 1666/// to show the different paths that one can take through the 1667/// inheritance hierarchy to go from the derived class to different 1668/// subobjects of a base class. The result looks something like this: 1669/// @code 1670/// struct D -> struct B -> struct A 1671/// struct D -> struct C -> struct A 1672/// @endcode 1673std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1674 std::string PathDisplayStr; 1675 std::set<unsigned> DisplayedPaths; 1676 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1677 Path != Paths.end(); ++Path) { 1678 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1679 // We haven't displayed a path to this particular base 1680 // class subobject yet. 1681 PathDisplayStr += "\n "; 1682 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1683 for (CXXBasePath::const_iterator Element = Path->begin(); 1684 Element != Path->end(); ++Element) 1685 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1686 } 1687 } 1688 1689 return PathDisplayStr; 1690} 1691 1692//===----------------------------------------------------------------------===// 1693// C++ class member Handling 1694//===----------------------------------------------------------------------===// 1695 1696/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1697bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1698 SourceLocation ASLoc, 1699 SourceLocation ColonLoc, 1700 AttributeList *Attrs) { 1701 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1702 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1703 ASLoc, ColonLoc); 1704 CurContext->addHiddenDecl(ASDecl); 1705 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1706} 1707 1708/// CheckOverrideControl - Check C++11 override control semantics. 1709void Sema::CheckOverrideControl(NamedDecl *D) { 1710 if (D->isInvalidDecl()) 1711 return; 1712 1713 // We only care about "override" and "final" declarations. 1714 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) 1715 return; 1716 1717 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1718 1719 // We can't check dependent instance methods. 1720 if (MD && MD->isInstance() && 1721 (MD->getParent()->hasAnyDependentBases() || 1722 MD->getType()->isDependentType())) 1723 return; 1724 1725 if (MD && !MD->isVirtual()) { 1726 // If we have a non-virtual method, check if if hides a virtual method. 1727 // (In that case, it's most likely the method has the wrong type.) 1728 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 1729 FindHiddenVirtualMethods(MD, OverloadedMethods); 1730 1731 if (!OverloadedMethods.empty()) { 1732 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1733 Diag(OA->getLocation(), 1734 diag::override_keyword_hides_virtual_member_function) 1735 << "override" << (OverloadedMethods.size() > 1); 1736 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1737 Diag(FA->getLocation(), 1738 diag::override_keyword_hides_virtual_member_function) 1739 << "final" << (OverloadedMethods.size() > 1); 1740 } 1741 NoteHiddenVirtualMethods(MD, OverloadedMethods); 1742 MD->setInvalidDecl(); 1743 return; 1744 } 1745 // Fall through into the general case diagnostic. 1746 // FIXME: We might want to attempt typo correction here. 1747 } 1748 1749 if (!MD || !MD->isVirtual()) { 1750 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1751 Diag(OA->getLocation(), 1752 diag::override_keyword_only_allowed_on_virtual_member_functions) 1753 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1754 D->dropAttr<OverrideAttr>(); 1755 } 1756 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1757 Diag(FA->getLocation(), 1758 diag::override_keyword_only_allowed_on_virtual_member_functions) 1759 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1760 D->dropAttr<FinalAttr>(); 1761 } 1762 return; 1763 } 1764 1765 // C++11 [class.virtual]p5: 1766 // If a virtual function is marked with the virt-specifier override and 1767 // does not override a member function of a base class, the program is 1768 // ill-formed. 1769 bool HasOverriddenMethods = 1770 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1771 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1772 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1773 << MD->getDeclName(); 1774} 1775 1776/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1777/// function overrides a virtual member function marked 'final', according to 1778/// C++11 [class.virtual]p4. 1779bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1780 const CXXMethodDecl *Old) { 1781 if (!Old->hasAttr<FinalAttr>()) 1782 return false; 1783 1784 Diag(New->getLocation(), diag::err_final_function_overridden) 1785 << New->getDeclName(); 1786 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1787 return true; 1788} 1789 1790static bool InitializationHasSideEffects(const FieldDecl &FD) { 1791 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1792 // FIXME: Destruction of ObjC lifetime types has side-effects. 1793 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1794 return !RD->isCompleteDefinition() || 1795 !RD->hasTrivialDefaultConstructor() || 1796 !RD->hasTrivialDestructor(); 1797 return false; 1798} 1799 1800static AttributeList *getMSPropertyAttr(AttributeList *list) { 1801 for (AttributeList* it = list; it != 0; it = it->getNext()) 1802 if (it->isDeclspecPropertyAttribute()) 1803 return it; 1804 return 0; 1805} 1806 1807/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1808/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1809/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1810/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1811/// present (but parsing it has been deferred). 1812NamedDecl * 1813Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1814 MultiTemplateParamsArg TemplateParameterLists, 1815 Expr *BW, const VirtSpecifiers &VS, 1816 InClassInitStyle InitStyle) { 1817 const DeclSpec &DS = D.getDeclSpec(); 1818 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1819 DeclarationName Name = NameInfo.getName(); 1820 SourceLocation Loc = NameInfo.getLoc(); 1821 1822 // For anonymous bitfields, the location should point to the type. 1823 if (Loc.isInvalid()) 1824 Loc = D.getLocStart(); 1825 1826 Expr *BitWidth = static_cast<Expr*>(BW); 1827 1828 assert(isa<CXXRecordDecl>(CurContext)); 1829 assert(!DS.isFriendSpecified()); 1830 1831 bool isFunc = D.isDeclarationOfFunction(); 1832 1833 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1834 // The Microsoft extension __interface only permits public member functions 1835 // and prohibits constructors, destructors, operators, non-public member 1836 // functions, static methods and data members. 1837 unsigned InvalidDecl; 1838 bool ShowDeclName = true; 1839 if (!isFunc) 1840 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1841 else if (AS != AS_public) 1842 InvalidDecl = 2; 1843 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1844 InvalidDecl = 3; 1845 else switch (Name.getNameKind()) { 1846 case DeclarationName::CXXConstructorName: 1847 InvalidDecl = 4; 1848 ShowDeclName = false; 1849 break; 1850 1851 case DeclarationName::CXXDestructorName: 1852 InvalidDecl = 5; 1853 ShowDeclName = false; 1854 break; 1855 1856 case DeclarationName::CXXOperatorName: 1857 case DeclarationName::CXXConversionFunctionName: 1858 InvalidDecl = 6; 1859 break; 1860 1861 default: 1862 InvalidDecl = 0; 1863 break; 1864 } 1865 1866 if (InvalidDecl) { 1867 if (ShowDeclName) 1868 Diag(Loc, diag::err_invalid_member_in_interface) 1869 << (InvalidDecl-1) << Name; 1870 else 1871 Diag(Loc, diag::err_invalid_member_in_interface) 1872 << (InvalidDecl-1) << ""; 1873 return 0; 1874 } 1875 } 1876 1877 // C++ 9.2p6: A member shall not be declared to have automatic storage 1878 // duration (auto, register) or with the extern storage-class-specifier. 1879 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1880 // data members and cannot be applied to names declared const or static, 1881 // and cannot be applied to reference members. 1882 switch (DS.getStorageClassSpec()) { 1883 case DeclSpec::SCS_unspecified: 1884 case DeclSpec::SCS_typedef: 1885 case DeclSpec::SCS_static: 1886 break; 1887 case DeclSpec::SCS_mutable: 1888 if (isFunc) { 1889 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1890 1891 // FIXME: It would be nicer if the keyword was ignored only for this 1892 // declarator. Otherwise we could get follow-up errors. 1893 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1894 } 1895 break; 1896 default: 1897 Diag(DS.getStorageClassSpecLoc(), 1898 diag::err_storageclass_invalid_for_member); 1899 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1900 break; 1901 } 1902 1903 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1904 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1905 !isFunc); 1906 1907 if (DS.isConstexprSpecified() && isInstField) { 1908 SemaDiagnosticBuilder B = 1909 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1910 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1911 if (InitStyle == ICIS_NoInit) { 1912 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1913 D.getMutableDeclSpec().ClearConstexprSpec(); 1914 const char *PrevSpec; 1915 unsigned DiagID; 1916 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1917 PrevSpec, DiagID, getLangOpts()); 1918 (void)Failed; 1919 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1920 } else { 1921 B << 1; 1922 const char *PrevSpec; 1923 unsigned DiagID; 1924 if (D.getMutableDeclSpec().SetStorageClassSpec( 1925 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1926 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1927 "This is the only DeclSpec that should fail to be applied"); 1928 B << 1; 1929 } else { 1930 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1931 isInstField = false; 1932 } 1933 } 1934 } 1935 1936 NamedDecl *Member; 1937 if (isInstField) { 1938 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1939 1940 // Data members must have identifiers for names. 1941 if (!Name.isIdentifier()) { 1942 Diag(Loc, diag::err_bad_variable_name) 1943 << Name; 1944 return 0; 1945 } 1946 1947 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1948 1949 // Member field could not be with "template" keyword. 1950 // So TemplateParameterLists should be empty in this case. 1951 if (TemplateParameterLists.size()) { 1952 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1953 if (TemplateParams->size()) { 1954 // There is no such thing as a member field template. 1955 Diag(D.getIdentifierLoc(), diag::err_template_member) 1956 << II 1957 << SourceRange(TemplateParams->getTemplateLoc(), 1958 TemplateParams->getRAngleLoc()); 1959 } else { 1960 // There is an extraneous 'template<>' for this member. 1961 Diag(TemplateParams->getTemplateLoc(), 1962 diag::err_template_member_noparams) 1963 << II 1964 << SourceRange(TemplateParams->getTemplateLoc(), 1965 TemplateParams->getRAngleLoc()); 1966 } 1967 return 0; 1968 } 1969 1970 if (SS.isSet() && !SS.isInvalid()) { 1971 // The user provided a superfluous scope specifier inside a class 1972 // definition: 1973 // 1974 // class X { 1975 // int X::member; 1976 // }; 1977 if (DeclContext *DC = computeDeclContext(SS, false)) 1978 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1979 else 1980 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1981 << Name << SS.getRange(); 1982 1983 SS.clear(); 1984 } 1985 1986 AttributeList *MSPropertyAttr = 1987 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1988 if (MSPropertyAttr) { 1989 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1990 BitWidth, InitStyle, AS, MSPropertyAttr); 1991 if (!Member) 1992 return 0; 1993 isInstField = false; 1994 } else { 1995 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1996 BitWidth, InitStyle, AS); 1997 assert(Member && "HandleField never returns null"); 1998 } 1999 } else { 2000 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 2001 2002 Member = HandleDeclarator(S, D, TemplateParameterLists); 2003 if (!Member) 2004 return 0; 2005 2006 // Non-instance-fields can't have a bitfield. 2007 if (BitWidth) { 2008 if (Member->isInvalidDecl()) { 2009 // don't emit another diagnostic. 2010 } else if (isa<VarDecl>(Member)) { 2011 // C++ 9.6p3: A bit-field shall not be a static member. 2012 // "static member 'A' cannot be a bit-field" 2013 Diag(Loc, diag::err_static_not_bitfield) 2014 << Name << BitWidth->getSourceRange(); 2015 } else if (isa<TypedefDecl>(Member)) { 2016 // "typedef member 'x' cannot be a bit-field" 2017 Diag(Loc, diag::err_typedef_not_bitfield) 2018 << Name << BitWidth->getSourceRange(); 2019 } else { 2020 // A function typedef ("typedef int f(); f a;"). 2021 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 2022 Diag(Loc, diag::err_not_integral_type_bitfield) 2023 << Name << cast<ValueDecl>(Member)->getType() 2024 << BitWidth->getSourceRange(); 2025 } 2026 2027 BitWidth = 0; 2028 Member->setInvalidDecl(); 2029 } 2030 2031 Member->setAccess(AS); 2032 2033 // If we have declared a member function template or static data member 2034 // template, set the access of the templated declaration as well. 2035 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 2036 FunTmpl->getTemplatedDecl()->setAccess(AS); 2037 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) 2038 VarTmpl->getTemplatedDecl()->setAccess(AS); 2039 } 2040 2041 if (VS.isOverrideSpecified()) 2042 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 2043 if (VS.isFinalSpecified()) 2044 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 2045 2046 if (VS.getLastLocation().isValid()) { 2047 // Update the end location of a method that has a virt-specifiers. 2048 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 2049 MD->setRangeEnd(VS.getLastLocation()); 2050 } 2051 2052 CheckOverrideControl(Member); 2053 2054 assert((Name || isInstField) && "No identifier for non-field ?"); 2055 2056 if (isInstField) { 2057 FieldDecl *FD = cast<FieldDecl>(Member); 2058 FieldCollector->Add(FD); 2059 2060 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2061 FD->getLocation()) 2062 != DiagnosticsEngine::Ignored) { 2063 // Remember all explicit private FieldDecls that have a name, no side 2064 // effects and are not part of a dependent type declaration. 2065 if (!FD->isImplicit() && FD->getDeclName() && 2066 FD->getAccess() == AS_private && 2067 !FD->hasAttr<UnusedAttr>() && 2068 !FD->getParent()->isDependentContext() && 2069 !InitializationHasSideEffects(*FD)) 2070 UnusedPrivateFields.insert(FD); 2071 } 2072 } 2073 2074 return Member; 2075} 2076 2077namespace { 2078 class UninitializedFieldVisitor 2079 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2080 Sema &S; 2081 // If VD is null, this visitor will only update the Decls set. 2082 ValueDecl *VD; 2083 bool isReferenceType; 2084 // List of Decls to generate a warning on. 2085 llvm::SmallPtrSet<ValueDecl*, 4> &Decls; 2086 bool WarnOnSelfReference; 2087 // If non-null, add a note to the warning pointing back to the constructor. 2088 const CXXConstructorDecl *Constructor; 2089 public: 2090 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2091 UninitializedFieldVisitor(Sema &S, ValueDecl *VD, 2092 llvm::SmallPtrSet<ValueDecl*, 4> &Decls, 2093 bool WarnOnSelfReference, 2094 const CXXConstructorDecl *Constructor) 2095 : Inherited(S.Context), S(S), VD(VD), isReferenceType(false), Decls(Decls), 2096 WarnOnSelfReference(WarnOnSelfReference), Constructor(Constructor) { 2097 // When VD is null, this visitor is used to detect initialization of other 2098 // fields. 2099 if (VD) { 2100 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 2101 this->VD = IFD->getAnonField(); 2102 else 2103 this->VD = VD; 2104 isReferenceType = this->VD->getType()->isReferenceType(); 2105 } 2106 } 2107 2108 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly) { 2109 if (!VD) 2110 return; 2111 2112 if (CheckReferenceOnly && !isReferenceType) 2113 return; 2114 2115 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2116 return; 2117 2118 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2119 // or union. 2120 MemberExpr *FieldME = ME; 2121 2122 Expr *Base = ME; 2123 while (isa<MemberExpr>(Base)) { 2124 ME = cast<MemberExpr>(Base); 2125 2126 if (isa<VarDecl>(ME->getMemberDecl())) 2127 return; 2128 2129 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2130 if (!FD->isAnonymousStructOrUnion()) 2131 FieldME = ME; 2132 2133 Base = ME->getBase(); 2134 } 2135 2136 if (!isa<CXXThisExpr>(Base)) 2137 return; 2138 2139 ValueDecl* FoundVD = FieldME->getMemberDecl(); 2140 2141 if (VD == FoundVD) { 2142 if (!WarnOnSelfReference) 2143 return; 2144 2145 unsigned diag = isReferenceType 2146 ? diag::warn_reference_field_is_uninit 2147 : diag::warn_field_is_uninit; 2148 S.Diag(FieldME->getExprLoc(), diag) << VD; 2149 if (Constructor) 2150 S.Diag(Constructor->getLocation(), 2151 diag::note_uninit_in_this_constructor); 2152 return; 2153 } 2154 2155 if (CheckReferenceOnly) 2156 return; 2157 2158 if (Decls.count(FoundVD)) { 2159 S.Diag(FieldME->getExprLoc(), diag::warn_field_is_uninit) << FoundVD; 2160 if (Constructor) 2161 S.Diag(Constructor->getLocation(), 2162 diag::note_uninit_in_this_constructor); 2163 2164 } 2165 } 2166 2167 void HandleValue(Expr *E) { 2168 if (!VD) 2169 return; 2170 2171 E = E->IgnoreParens(); 2172 2173 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2174 HandleMemberExpr(ME, false /*CheckReferenceOnly*/); 2175 return; 2176 } 2177 2178 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2179 HandleValue(CO->getTrueExpr()); 2180 HandleValue(CO->getFalseExpr()); 2181 return; 2182 } 2183 2184 if (BinaryConditionalOperator *BCO = 2185 dyn_cast<BinaryConditionalOperator>(E)) { 2186 HandleValue(BCO->getCommon()); 2187 HandleValue(BCO->getFalseExpr()); 2188 return; 2189 } 2190 2191 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2192 switch (BO->getOpcode()) { 2193 default: 2194 return; 2195 case(BO_PtrMemD): 2196 case(BO_PtrMemI): 2197 HandleValue(BO->getLHS()); 2198 return; 2199 case(BO_Comma): 2200 HandleValue(BO->getRHS()); 2201 return; 2202 } 2203 } 2204 } 2205 2206 void VisitMemberExpr(MemberExpr *ME) { 2207 HandleMemberExpr(ME, true /*CheckReferenceOnly*/); 2208 2209 Inherited::VisitMemberExpr(ME); 2210 } 2211 2212 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2213 if (E->getCastKind() == CK_LValueToRValue) 2214 HandleValue(E->getSubExpr()); 2215 2216 Inherited::VisitImplicitCastExpr(E); 2217 } 2218 2219 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2220 if (E->getConstructor()->isCopyConstructor()) 2221 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(E->getArg(0))) 2222 if (ICE->getCastKind() == CK_NoOp) 2223 if (MemberExpr *ME = dyn_cast<MemberExpr>(ICE->getSubExpr())) 2224 HandleMemberExpr(ME, false /*CheckReferenceOnly*/); 2225 2226 Inherited::VisitCXXConstructExpr(E); 2227 } 2228 2229 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2230 Expr *Callee = E->getCallee(); 2231 if (isa<MemberExpr>(Callee)) 2232 HandleValue(Callee); 2233 2234 Inherited::VisitCXXMemberCallExpr(E); 2235 } 2236 2237 void VisitBinaryOperator(BinaryOperator *E) { 2238 // If a field assignment is detected, remove the field from the 2239 // uninitiailized field set. 2240 if (E->getOpcode() == BO_Assign) 2241 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) 2242 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2243 Decls.erase(FD); 2244 2245 Inherited::VisitBinaryOperator(E); 2246 } 2247 }; 2248 static void CheckInitExprContainsUninitializedFields( 2249 Sema &S, Expr *E, ValueDecl *VD, llvm::SmallPtrSet<ValueDecl*, 4> &Decls, 2250 bool WarnOnSelfReference, const CXXConstructorDecl *Constructor = 0) { 2251 if (Decls.size() == 0 && !WarnOnSelfReference) 2252 return; 2253 2254 if (E) 2255 UninitializedFieldVisitor(S, VD, Decls, WarnOnSelfReference, Constructor) 2256 .Visit(E); 2257 } 2258} // namespace 2259 2260/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2261/// in-class initializer for a non-static C++ class member, and after 2262/// instantiating an in-class initializer in a class template. Such actions 2263/// are deferred until the class is complete. 2264void 2265Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2266 Expr *InitExpr) { 2267 FieldDecl *FD = cast<FieldDecl>(D); 2268 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2269 "must set init style when field is created"); 2270 2271 if (!InitExpr) { 2272 FD->setInvalidDecl(); 2273 FD->removeInClassInitializer(); 2274 return; 2275 } 2276 2277 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2278 FD->setInvalidDecl(); 2279 FD->removeInClassInitializer(); 2280 return; 2281 } 2282 2283 ExprResult Init = InitExpr; 2284 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2285 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2286 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2287 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2288 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2289 InitializationSequence Seq(*this, Entity, Kind, InitExpr); 2290 Init = Seq.Perform(*this, Entity, Kind, InitExpr); 2291 if (Init.isInvalid()) { 2292 FD->setInvalidDecl(); 2293 return; 2294 } 2295 } 2296 2297 // C++11 [class.base.init]p7: 2298 // The initialization of each base and member constitutes a 2299 // full-expression. 2300 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2301 if (Init.isInvalid()) { 2302 FD->setInvalidDecl(); 2303 return; 2304 } 2305 2306 InitExpr = Init.release(); 2307 2308 FD->setInClassInitializer(InitExpr); 2309} 2310 2311/// \brief Find the direct and/or virtual base specifiers that 2312/// correspond to the given base type, for use in base initialization 2313/// within a constructor. 2314static bool FindBaseInitializer(Sema &SemaRef, 2315 CXXRecordDecl *ClassDecl, 2316 QualType BaseType, 2317 const CXXBaseSpecifier *&DirectBaseSpec, 2318 const CXXBaseSpecifier *&VirtualBaseSpec) { 2319 // First, check for a direct base class. 2320 DirectBaseSpec = 0; 2321 for (CXXRecordDecl::base_class_const_iterator Base 2322 = ClassDecl->bases_begin(); 2323 Base != ClassDecl->bases_end(); ++Base) { 2324 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2325 // We found a direct base of this type. That's what we're 2326 // initializing. 2327 DirectBaseSpec = &*Base; 2328 break; 2329 } 2330 } 2331 2332 // Check for a virtual base class. 2333 // FIXME: We might be able to short-circuit this if we know in advance that 2334 // there are no virtual bases. 2335 VirtualBaseSpec = 0; 2336 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2337 // We haven't found a base yet; search the class hierarchy for a 2338 // virtual base class. 2339 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2340 /*DetectVirtual=*/false); 2341 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2342 BaseType, Paths)) { 2343 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2344 Path != Paths.end(); ++Path) { 2345 if (Path->back().Base->isVirtual()) { 2346 VirtualBaseSpec = Path->back().Base; 2347 break; 2348 } 2349 } 2350 } 2351 } 2352 2353 return DirectBaseSpec || VirtualBaseSpec; 2354} 2355 2356/// \brief Handle a C++ member initializer using braced-init-list syntax. 2357MemInitResult 2358Sema::ActOnMemInitializer(Decl *ConstructorD, 2359 Scope *S, 2360 CXXScopeSpec &SS, 2361 IdentifierInfo *MemberOrBase, 2362 ParsedType TemplateTypeTy, 2363 const DeclSpec &DS, 2364 SourceLocation IdLoc, 2365 Expr *InitList, 2366 SourceLocation EllipsisLoc) { 2367 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2368 DS, IdLoc, InitList, 2369 EllipsisLoc); 2370} 2371 2372/// \brief Handle a C++ member initializer using parentheses syntax. 2373MemInitResult 2374Sema::ActOnMemInitializer(Decl *ConstructorD, 2375 Scope *S, 2376 CXXScopeSpec &SS, 2377 IdentifierInfo *MemberOrBase, 2378 ParsedType TemplateTypeTy, 2379 const DeclSpec &DS, 2380 SourceLocation IdLoc, 2381 SourceLocation LParenLoc, 2382 ArrayRef<Expr *> Args, 2383 SourceLocation RParenLoc, 2384 SourceLocation EllipsisLoc) { 2385 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2386 Args, RParenLoc); 2387 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2388 DS, IdLoc, List, EllipsisLoc); 2389} 2390 2391namespace { 2392 2393// Callback to only accept typo corrections that can be a valid C++ member 2394// intializer: either a non-static field member or a base class. 2395class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2396public: 2397 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2398 : ClassDecl(ClassDecl) {} 2399 2400 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 2401 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2402 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2403 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2404 return isa<TypeDecl>(ND); 2405 } 2406 return false; 2407 } 2408 2409private: 2410 CXXRecordDecl *ClassDecl; 2411}; 2412 2413} 2414 2415/// \brief Handle a C++ member initializer. 2416MemInitResult 2417Sema::BuildMemInitializer(Decl *ConstructorD, 2418 Scope *S, 2419 CXXScopeSpec &SS, 2420 IdentifierInfo *MemberOrBase, 2421 ParsedType TemplateTypeTy, 2422 const DeclSpec &DS, 2423 SourceLocation IdLoc, 2424 Expr *Init, 2425 SourceLocation EllipsisLoc) { 2426 if (!ConstructorD) 2427 return true; 2428 2429 AdjustDeclIfTemplate(ConstructorD); 2430 2431 CXXConstructorDecl *Constructor 2432 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2433 if (!Constructor) { 2434 // The user wrote a constructor initializer on a function that is 2435 // not a C++ constructor. Ignore the error for now, because we may 2436 // have more member initializers coming; we'll diagnose it just 2437 // once in ActOnMemInitializers. 2438 return true; 2439 } 2440 2441 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2442 2443 // C++ [class.base.init]p2: 2444 // Names in a mem-initializer-id are looked up in the scope of the 2445 // constructor's class and, if not found in that scope, are looked 2446 // up in the scope containing the constructor's definition. 2447 // [Note: if the constructor's class contains a member with the 2448 // same name as a direct or virtual base class of the class, a 2449 // mem-initializer-id naming the member or base class and composed 2450 // of a single identifier refers to the class member. A 2451 // mem-initializer-id for the hidden base class may be specified 2452 // using a qualified name. ] 2453 if (!SS.getScopeRep() && !TemplateTypeTy) { 2454 // Look for a member, first. 2455 DeclContext::lookup_result Result 2456 = ClassDecl->lookup(MemberOrBase); 2457 if (!Result.empty()) { 2458 ValueDecl *Member; 2459 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2460 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2461 if (EllipsisLoc.isValid()) 2462 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2463 << MemberOrBase 2464 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2465 2466 return BuildMemberInitializer(Member, Init, IdLoc); 2467 } 2468 } 2469 } 2470 // It didn't name a member, so see if it names a class. 2471 QualType BaseType; 2472 TypeSourceInfo *TInfo = 0; 2473 2474 if (TemplateTypeTy) { 2475 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2476 } else if (DS.getTypeSpecType() == TST_decltype) { 2477 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2478 } else { 2479 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2480 LookupParsedName(R, S, &SS); 2481 2482 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2483 if (!TyD) { 2484 if (R.isAmbiguous()) return true; 2485 2486 // We don't want access-control diagnostics here. 2487 R.suppressDiagnostics(); 2488 2489 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2490 bool NotUnknownSpecialization = false; 2491 DeclContext *DC = computeDeclContext(SS, false); 2492 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2493 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2494 2495 if (!NotUnknownSpecialization) { 2496 // When the scope specifier can refer to a member of an unknown 2497 // specialization, we take it as a type name. 2498 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2499 SS.getWithLocInContext(Context), 2500 *MemberOrBase, IdLoc); 2501 if (BaseType.isNull()) 2502 return true; 2503 2504 R.clear(); 2505 R.setLookupName(MemberOrBase); 2506 } 2507 } 2508 2509 // If no results were found, try to correct typos. 2510 TypoCorrection Corr; 2511 MemInitializerValidatorCCC Validator(ClassDecl); 2512 if (R.empty() && BaseType.isNull() && 2513 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2514 Validator, ClassDecl))) { 2515 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2516 // We have found a non-static data member with a similar 2517 // name to what was typed; complain and initialize that 2518 // member. 2519 diagnoseTypo(Corr, 2520 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2521 << MemberOrBase << true); 2522 return BuildMemberInitializer(Member, Init, IdLoc); 2523 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2524 const CXXBaseSpecifier *DirectBaseSpec; 2525 const CXXBaseSpecifier *VirtualBaseSpec; 2526 if (FindBaseInitializer(*this, ClassDecl, 2527 Context.getTypeDeclType(Type), 2528 DirectBaseSpec, VirtualBaseSpec)) { 2529 // We have found a direct or virtual base class with a 2530 // similar name to what was typed; complain and initialize 2531 // that base class. 2532 diagnoseTypo(Corr, 2533 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2534 << MemberOrBase << false, 2535 PDiag() /*Suppress note, we provide our own.*/); 2536 2537 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec 2538 : VirtualBaseSpec; 2539 Diag(BaseSpec->getLocStart(), 2540 diag::note_base_class_specified_here) 2541 << BaseSpec->getType() 2542 << BaseSpec->getSourceRange(); 2543 2544 TyD = Type; 2545 } 2546 } 2547 } 2548 2549 if (!TyD && BaseType.isNull()) { 2550 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2551 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2552 return true; 2553 } 2554 } 2555 2556 if (BaseType.isNull()) { 2557 BaseType = Context.getTypeDeclType(TyD); 2558 if (SS.isSet()) { 2559 NestedNameSpecifier *Qualifier = 2560 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2561 2562 // FIXME: preserve source range information 2563 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2564 } 2565 } 2566 } 2567 2568 if (!TInfo) 2569 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2570 2571 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2572} 2573 2574/// Checks a member initializer expression for cases where reference (or 2575/// pointer) members are bound to by-value parameters (or their addresses). 2576static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2577 Expr *Init, 2578 SourceLocation IdLoc) { 2579 QualType MemberTy = Member->getType(); 2580 2581 // We only handle pointers and references currently. 2582 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2583 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2584 return; 2585 2586 const bool IsPointer = MemberTy->isPointerType(); 2587 if (IsPointer) { 2588 if (const UnaryOperator *Op 2589 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2590 // The only case we're worried about with pointers requires taking the 2591 // address. 2592 if (Op->getOpcode() != UO_AddrOf) 2593 return; 2594 2595 Init = Op->getSubExpr(); 2596 } else { 2597 // We only handle address-of expression initializers for pointers. 2598 return; 2599 } 2600 } 2601 2602 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2603 // We only warn when referring to a non-reference parameter declaration. 2604 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2605 if (!Parameter || Parameter->getType()->isReferenceType()) 2606 return; 2607 2608 S.Diag(Init->getExprLoc(), 2609 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2610 : diag::warn_bind_ref_member_to_parameter) 2611 << Member << Parameter << Init->getSourceRange(); 2612 } else { 2613 // Other initializers are fine. 2614 return; 2615 } 2616 2617 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2618 << (unsigned)IsPointer; 2619} 2620 2621MemInitResult 2622Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2623 SourceLocation IdLoc) { 2624 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2625 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2626 assert((DirectMember || IndirectMember) && 2627 "Member must be a FieldDecl or IndirectFieldDecl"); 2628 2629 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2630 return true; 2631 2632 if (Member->isInvalidDecl()) 2633 return true; 2634 2635 MultiExprArg Args; 2636 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2637 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2638 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2639 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); 2640 } else { 2641 // Template instantiation doesn't reconstruct ParenListExprs for us. 2642 Args = Init; 2643 } 2644 2645 SourceRange InitRange = Init->getSourceRange(); 2646 2647 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2648 // Can't check initialization for a member of dependent type or when 2649 // any of the arguments are type-dependent expressions. 2650 DiscardCleanupsInEvaluationContext(); 2651 } else { 2652 bool InitList = false; 2653 if (isa<InitListExpr>(Init)) { 2654 InitList = true; 2655 Args = Init; 2656 } 2657 2658 // Initialize the member. 2659 InitializedEntity MemberEntity = 2660 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2661 : InitializedEntity::InitializeMember(IndirectMember, 0); 2662 InitializationKind Kind = 2663 InitList ? InitializationKind::CreateDirectList(IdLoc) 2664 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2665 InitRange.getEnd()); 2666 2667 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); 2668 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0); 2669 if (MemberInit.isInvalid()) 2670 return true; 2671 2672 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc); 2673 2674 // C++11 [class.base.init]p7: 2675 // The initialization of each base and member constitutes a 2676 // full-expression. 2677 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2678 if (MemberInit.isInvalid()) 2679 return true; 2680 2681 Init = MemberInit.get(); 2682 } 2683 2684 if (DirectMember) { 2685 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2686 InitRange.getBegin(), Init, 2687 InitRange.getEnd()); 2688 } else { 2689 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2690 InitRange.getBegin(), Init, 2691 InitRange.getEnd()); 2692 } 2693} 2694 2695MemInitResult 2696Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2697 CXXRecordDecl *ClassDecl) { 2698 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2699 if (!LangOpts.CPlusPlus11) 2700 return Diag(NameLoc, diag::err_delegating_ctor) 2701 << TInfo->getTypeLoc().getLocalSourceRange(); 2702 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2703 2704 bool InitList = true; 2705 MultiExprArg Args = Init; 2706 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2707 InitList = false; 2708 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2709 } 2710 2711 SourceRange InitRange = Init->getSourceRange(); 2712 // Initialize the object. 2713 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2714 QualType(ClassDecl->getTypeForDecl(), 0)); 2715 InitializationKind Kind = 2716 InitList ? InitializationKind::CreateDirectList(NameLoc) 2717 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2718 InitRange.getEnd()); 2719 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); 2720 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2721 Args, 0); 2722 if (DelegationInit.isInvalid()) 2723 return true; 2724 2725 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2726 "Delegating constructor with no target?"); 2727 2728 // C++11 [class.base.init]p7: 2729 // The initialization of each base and member constitutes a 2730 // full-expression. 2731 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2732 InitRange.getBegin()); 2733 if (DelegationInit.isInvalid()) 2734 return true; 2735 2736 // If we are in a dependent context, template instantiation will 2737 // perform this type-checking again. Just save the arguments that we 2738 // received in a ParenListExpr. 2739 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2740 // of the information that we have about the base 2741 // initializer. However, deconstructing the ASTs is a dicey process, 2742 // and this approach is far more likely to get the corner cases right. 2743 if (CurContext->isDependentContext()) 2744 DelegationInit = Owned(Init); 2745 2746 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2747 DelegationInit.takeAs<Expr>(), 2748 InitRange.getEnd()); 2749} 2750 2751MemInitResult 2752Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2753 Expr *Init, CXXRecordDecl *ClassDecl, 2754 SourceLocation EllipsisLoc) { 2755 SourceLocation BaseLoc 2756 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2757 2758 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2759 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2760 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2761 2762 // C++ [class.base.init]p2: 2763 // [...] Unless the mem-initializer-id names a nonstatic data 2764 // member of the constructor's class or a direct or virtual base 2765 // of that class, the mem-initializer is ill-formed. A 2766 // mem-initializer-list can initialize a base class using any 2767 // name that denotes that base class type. 2768 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2769 2770 SourceRange InitRange = Init->getSourceRange(); 2771 if (EllipsisLoc.isValid()) { 2772 // This is a pack expansion. 2773 if (!BaseType->containsUnexpandedParameterPack()) { 2774 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2775 << SourceRange(BaseLoc, InitRange.getEnd()); 2776 2777 EllipsisLoc = SourceLocation(); 2778 } 2779 } else { 2780 // Check for any unexpanded parameter packs. 2781 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2782 return true; 2783 2784 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2785 return true; 2786 } 2787 2788 // Check for direct and virtual base classes. 2789 const CXXBaseSpecifier *DirectBaseSpec = 0; 2790 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2791 if (!Dependent) { 2792 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2793 BaseType)) 2794 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2795 2796 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2797 VirtualBaseSpec); 2798 2799 // C++ [base.class.init]p2: 2800 // Unless the mem-initializer-id names a nonstatic data member of the 2801 // constructor's class or a direct or virtual base of that class, the 2802 // mem-initializer is ill-formed. 2803 if (!DirectBaseSpec && !VirtualBaseSpec) { 2804 // If the class has any dependent bases, then it's possible that 2805 // one of those types will resolve to the same type as 2806 // BaseType. Therefore, just treat this as a dependent base 2807 // class initialization. FIXME: Should we try to check the 2808 // initialization anyway? It seems odd. 2809 if (ClassDecl->hasAnyDependentBases()) 2810 Dependent = true; 2811 else 2812 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2813 << BaseType << Context.getTypeDeclType(ClassDecl) 2814 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2815 } 2816 } 2817 2818 if (Dependent) { 2819 DiscardCleanupsInEvaluationContext(); 2820 2821 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2822 /*IsVirtual=*/false, 2823 InitRange.getBegin(), Init, 2824 InitRange.getEnd(), EllipsisLoc); 2825 } 2826 2827 // C++ [base.class.init]p2: 2828 // If a mem-initializer-id is ambiguous because it designates both 2829 // a direct non-virtual base class and an inherited virtual base 2830 // class, the mem-initializer is ill-formed. 2831 if (DirectBaseSpec && VirtualBaseSpec) 2832 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2833 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2834 2835 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; 2836 if (!BaseSpec) 2837 BaseSpec = VirtualBaseSpec; 2838 2839 // Initialize the base. 2840 bool InitList = true; 2841 MultiExprArg Args = Init; 2842 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2843 InitList = false; 2844 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2845 } 2846 2847 InitializedEntity BaseEntity = 2848 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2849 InitializationKind Kind = 2850 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2851 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2852 InitRange.getEnd()); 2853 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); 2854 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0); 2855 if (BaseInit.isInvalid()) 2856 return true; 2857 2858 // C++11 [class.base.init]p7: 2859 // The initialization of each base and member constitutes a 2860 // full-expression. 2861 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2862 if (BaseInit.isInvalid()) 2863 return true; 2864 2865 // If we are in a dependent context, template instantiation will 2866 // perform this type-checking again. Just save the arguments that we 2867 // received in a ParenListExpr. 2868 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2869 // of the information that we have about the base 2870 // initializer. However, deconstructing the ASTs is a dicey process, 2871 // and this approach is far more likely to get the corner cases right. 2872 if (CurContext->isDependentContext()) 2873 BaseInit = Owned(Init); 2874 2875 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2876 BaseSpec->isVirtual(), 2877 InitRange.getBegin(), 2878 BaseInit.takeAs<Expr>(), 2879 InitRange.getEnd(), EllipsisLoc); 2880} 2881 2882// Create a static_cast\<T&&>(expr). 2883static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2884 if (T.isNull()) T = E->getType(); 2885 QualType TargetType = SemaRef.BuildReferenceType( 2886 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2887 SourceLocation ExprLoc = E->getLocStart(); 2888 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2889 TargetType, ExprLoc); 2890 2891 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2892 SourceRange(ExprLoc, ExprLoc), 2893 E->getSourceRange()).take(); 2894} 2895 2896/// ImplicitInitializerKind - How an implicit base or member initializer should 2897/// initialize its base or member. 2898enum ImplicitInitializerKind { 2899 IIK_Default, 2900 IIK_Copy, 2901 IIK_Move, 2902 IIK_Inherit 2903}; 2904 2905static bool 2906BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2907 ImplicitInitializerKind ImplicitInitKind, 2908 CXXBaseSpecifier *BaseSpec, 2909 bool IsInheritedVirtualBase, 2910 CXXCtorInitializer *&CXXBaseInit) { 2911 InitializedEntity InitEntity 2912 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2913 IsInheritedVirtualBase); 2914 2915 ExprResult BaseInit; 2916 2917 switch (ImplicitInitKind) { 2918 case IIK_Inherit: { 2919 const CXXRecordDecl *Inherited = 2920 Constructor->getInheritedConstructor()->getParent(); 2921 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2922 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2923 // C++11 [class.inhctor]p8: 2924 // Each expression in the expression-list is of the form 2925 // static_cast<T&&>(p), where p is the name of the corresponding 2926 // constructor parameter and T is the declared type of p. 2927 SmallVector<Expr*, 16> Args; 2928 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2929 ParmVarDecl *PD = Constructor->getParamDecl(I); 2930 ExprResult ArgExpr = 2931 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2932 VK_LValue, SourceLocation()); 2933 if (ArgExpr.isInvalid()) 2934 return true; 2935 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2936 } 2937 2938 InitializationKind InitKind = InitializationKind::CreateDirect( 2939 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2940 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args); 2941 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2942 break; 2943 } 2944 } 2945 // Fall through. 2946 case IIK_Default: { 2947 InitializationKind InitKind 2948 = InitializationKind::CreateDefault(Constructor->getLocation()); 2949 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 2950 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 2951 break; 2952 } 2953 2954 case IIK_Move: 2955 case IIK_Copy: { 2956 bool Moving = ImplicitInitKind == IIK_Move; 2957 ParmVarDecl *Param = Constructor->getParamDecl(0); 2958 QualType ParamType = Param->getType().getNonReferenceType(); 2959 2960 Expr *CopyCtorArg = 2961 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2962 SourceLocation(), Param, false, 2963 Constructor->getLocation(), ParamType, 2964 VK_LValue, 0); 2965 2966 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2967 2968 // Cast to the base class to avoid ambiguities. 2969 QualType ArgTy = 2970 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2971 ParamType.getQualifiers()); 2972 2973 if (Moving) { 2974 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2975 } 2976 2977 CXXCastPath BasePath; 2978 BasePath.push_back(BaseSpec); 2979 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2980 CK_UncheckedDerivedToBase, 2981 Moving ? VK_XValue : VK_LValue, 2982 &BasePath).take(); 2983 2984 InitializationKind InitKind 2985 = InitializationKind::CreateDirect(Constructor->getLocation(), 2986 SourceLocation(), SourceLocation()); 2987 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); 2988 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); 2989 break; 2990 } 2991 } 2992 2993 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2994 if (BaseInit.isInvalid()) 2995 return true; 2996 2997 CXXBaseInit = 2998 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2999 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 3000 SourceLocation()), 3001 BaseSpec->isVirtual(), 3002 SourceLocation(), 3003 BaseInit.takeAs<Expr>(), 3004 SourceLocation(), 3005 SourceLocation()); 3006 3007 return false; 3008} 3009 3010static bool RefersToRValueRef(Expr *MemRef) { 3011 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 3012 return Referenced->getType()->isRValueReferenceType(); 3013} 3014 3015static bool 3016BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 3017 ImplicitInitializerKind ImplicitInitKind, 3018 FieldDecl *Field, IndirectFieldDecl *Indirect, 3019 CXXCtorInitializer *&CXXMemberInit) { 3020 if (Field->isInvalidDecl()) 3021 return true; 3022 3023 SourceLocation Loc = Constructor->getLocation(); 3024 3025 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 3026 bool Moving = ImplicitInitKind == IIK_Move; 3027 ParmVarDecl *Param = Constructor->getParamDecl(0); 3028 QualType ParamType = Param->getType().getNonReferenceType(); 3029 3030 // Suppress copying zero-width bitfields. 3031 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 3032 return false; 3033 3034 Expr *MemberExprBase = 3035 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 3036 SourceLocation(), Param, false, 3037 Loc, ParamType, VK_LValue, 0); 3038 3039 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 3040 3041 if (Moving) { 3042 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 3043 } 3044 3045 // Build a reference to this field within the parameter. 3046 CXXScopeSpec SS; 3047 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 3048 Sema::LookupMemberName); 3049 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 3050 : cast<ValueDecl>(Field), AS_public); 3051 MemberLookup.resolveKind(); 3052 ExprResult CtorArg 3053 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 3054 ParamType, Loc, 3055 /*IsArrow=*/false, 3056 SS, 3057 /*TemplateKWLoc=*/SourceLocation(), 3058 /*FirstQualifierInScope=*/0, 3059 MemberLookup, 3060 /*TemplateArgs=*/0); 3061 if (CtorArg.isInvalid()) 3062 return true; 3063 3064 // C++11 [class.copy]p15: 3065 // - if a member m has rvalue reference type T&&, it is direct-initialized 3066 // with static_cast<T&&>(x.m); 3067 if (RefersToRValueRef(CtorArg.get())) { 3068 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3069 } 3070 3071 // When the field we are copying is an array, create index variables for 3072 // each dimension of the array. We use these index variables to subscript 3073 // the source array, and other clients (e.g., CodeGen) will perform the 3074 // necessary iteration with these index variables. 3075 SmallVector<VarDecl *, 4> IndexVariables; 3076 QualType BaseType = Field->getType(); 3077 QualType SizeType = SemaRef.Context.getSizeType(); 3078 bool InitializingArray = false; 3079 while (const ConstantArrayType *Array 3080 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 3081 InitializingArray = true; 3082 // Create the iteration variable for this array index. 3083 IdentifierInfo *IterationVarName = 0; 3084 { 3085 SmallString<8> Str; 3086 llvm::raw_svector_ostream OS(Str); 3087 OS << "__i" << IndexVariables.size(); 3088 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 3089 } 3090 VarDecl *IterationVar 3091 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 3092 IterationVarName, SizeType, 3093 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 3094 SC_None); 3095 IndexVariables.push_back(IterationVar); 3096 3097 // Create a reference to the iteration variable. 3098 ExprResult IterationVarRef 3099 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 3100 assert(!IterationVarRef.isInvalid() && 3101 "Reference to invented variable cannot fail!"); 3102 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 3103 assert(!IterationVarRef.isInvalid() && 3104 "Conversion of invented variable cannot fail!"); 3105 3106 // Subscript the array with this iteration variable. 3107 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3108 IterationVarRef.take(), 3109 Loc); 3110 if (CtorArg.isInvalid()) 3111 return true; 3112 3113 BaseType = Array->getElementType(); 3114 } 3115 3116 // The array subscript expression is an lvalue, which is wrong for moving. 3117 if (Moving && InitializingArray) 3118 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3119 3120 // Construct the entity that we will be initializing. For an array, this 3121 // will be first element in the array, which may require several levels 3122 // of array-subscript entities. 3123 SmallVector<InitializedEntity, 4> Entities; 3124 Entities.reserve(1 + IndexVariables.size()); 3125 if (Indirect) 3126 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3127 else 3128 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3129 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3130 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3131 0, 3132 Entities.back())); 3133 3134 // Direct-initialize to use the copy constructor. 3135 InitializationKind InitKind = 3136 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3137 3138 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3139 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE); 3140 3141 ExprResult MemberInit 3142 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3143 MultiExprArg(&CtorArgE, 1)); 3144 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3145 if (MemberInit.isInvalid()) 3146 return true; 3147 3148 if (Indirect) { 3149 assert(IndexVariables.size() == 0 && 3150 "Indirect field improperly initialized"); 3151 CXXMemberInit 3152 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3153 Loc, Loc, 3154 MemberInit.takeAs<Expr>(), 3155 Loc); 3156 } else 3157 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3158 Loc, MemberInit.takeAs<Expr>(), 3159 Loc, 3160 IndexVariables.data(), 3161 IndexVariables.size()); 3162 return false; 3163 } 3164 3165 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3166 "Unhandled implicit init kind!"); 3167 3168 QualType FieldBaseElementType = 3169 SemaRef.Context.getBaseElementType(Field->getType()); 3170 3171 if (FieldBaseElementType->isRecordType()) { 3172 InitializedEntity InitEntity 3173 = Indirect? InitializedEntity::InitializeMember(Indirect) 3174 : InitializedEntity::InitializeMember(Field); 3175 InitializationKind InitKind = 3176 InitializationKind::CreateDefault(Loc); 3177 3178 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3179 ExprResult MemberInit = 3180 InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3181 3182 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3183 if (MemberInit.isInvalid()) 3184 return true; 3185 3186 if (Indirect) 3187 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3188 Indirect, Loc, 3189 Loc, 3190 MemberInit.get(), 3191 Loc); 3192 else 3193 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3194 Field, Loc, Loc, 3195 MemberInit.get(), 3196 Loc); 3197 return false; 3198 } 3199 3200 if (!Field->getParent()->isUnion()) { 3201 if (FieldBaseElementType->isReferenceType()) { 3202 SemaRef.Diag(Constructor->getLocation(), 3203 diag::err_uninitialized_member_in_ctor) 3204 << (int)Constructor->isImplicit() 3205 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3206 << 0 << Field->getDeclName(); 3207 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3208 return true; 3209 } 3210 3211 if (FieldBaseElementType.isConstQualified()) { 3212 SemaRef.Diag(Constructor->getLocation(), 3213 diag::err_uninitialized_member_in_ctor) 3214 << (int)Constructor->isImplicit() 3215 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3216 << 1 << Field->getDeclName(); 3217 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3218 return true; 3219 } 3220 } 3221 3222 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3223 FieldBaseElementType->isObjCRetainableType() && 3224 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3225 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3226 // ARC: 3227 // Default-initialize Objective-C pointers to NULL. 3228 CXXMemberInit 3229 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3230 Loc, Loc, 3231 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3232 Loc); 3233 return false; 3234 } 3235 3236 // Nothing to initialize. 3237 CXXMemberInit = 0; 3238 return false; 3239} 3240 3241namespace { 3242struct BaseAndFieldInfo { 3243 Sema &S; 3244 CXXConstructorDecl *Ctor; 3245 bool AnyErrorsInInits; 3246 ImplicitInitializerKind IIK; 3247 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3248 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3249 3250 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3251 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3252 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3253 if (Generated && Ctor->isCopyConstructor()) 3254 IIK = IIK_Copy; 3255 else if (Generated && Ctor->isMoveConstructor()) 3256 IIK = IIK_Move; 3257 else if (Ctor->getInheritedConstructor()) 3258 IIK = IIK_Inherit; 3259 else 3260 IIK = IIK_Default; 3261 } 3262 3263 bool isImplicitCopyOrMove() const { 3264 switch (IIK) { 3265 case IIK_Copy: 3266 case IIK_Move: 3267 return true; 3268 3269 case IIK_Default: 3270 case IIK_Inherit: 3271 return false; 3272 } 3273 3274 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3275 } 3276 3277 bool addFieldInitializer(CXXCtorInitializer *Init) { 3278 AllToInit.push_back(Init); 3279 3280 // Check whether this initializer makes the field "used". 3281 if (Init->getInit()->HasSideEffects(S.Context)) 3282 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3283 3284 return false; 3285 } 3286}; 3287} 3288 3289/// \brief Determine whether the given indirect field declaration is somewhere 3290/// within an anonymous union. 3291static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3292 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3293 CEnd = F->chain_end(); 3294 C != CEnd; ++C) 3295 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3296 if (Record->isUnion()) 3297 return true; 3298 3299 return false; 3300} 3301 3302/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3303/// array type. 3304static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3305 if (T->isIncompleteArrayType()) 3306 return true; 3307 3308 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3309 if (!ArrayT->getSize()) 3310 return true; 3311 3312 T = ArrayT->getElementType(); 3313 } 3314 3315 return false; 3316} 3317 3318static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3319 FieldDecl *Field, 3320 IndirectFieldDecl *Indirect = 0) { 3321 if (Field->isInvalidDecl()) 3322 return false; 3323 3324 // Overwhelmingly common case: we have a direct initializer for this field. 3325 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3326 return Info.addFieldInitializer(Init); 3327 3328 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3329 // has a brace-or-equal-initializer, the entity is initialized as specified 3330 // in [dcl.init]. 3331 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3332 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3333 Info.Ctor->getLocation(), Field); 3334 CXXCtorInitializer *Init; 3335 if (Indirect) 3336 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3337 SourceLocation(), 3338 SourceLocation(), DIE, 3339 SourceLocation()); 3340 else 3341 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3342 SourceLocation(), 3343 SourceLocation(), DIE, 3344 SourceLocation()); 3345 return Info.addFieldInitializer(Init); 3346 } 3347 3348 // Don't build an implicit initializer for union members if none was 3349 // explicitly specified. 3350 if (Field->getParent()->isUnion() || 3351 (Indirect && isWithinAnonymousUnion(Indirect))) 3352 return false; 3353 3354 // Don't initialize incomplete or zero-length arrays. 3355 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3356 return false; 3357 3358 // Don't try to build an implicit initializer if there were semantic 3359 // errors in any of the initializers (and therefore we might be 3360 // missing some that the user actually wrote). 3361 if (Info.AnyErrorsInInits) 3362 return false; 3363 3364 CXXCtorInitializer *Init = 0; 3365 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3366 Indirect, Init)) 3367 return true; 3368 3369 if (!Init) 3370 return false; 3371 3372 return Info.addFieldInitializer(Init); 3373} 3374 3375bool 3376Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3377 CXXCtorInitializer *Initializer) { 3378 assert(Initializer->isDelegatingInitializer()); 3379 Constructor->setNumCtorInitializers(1); 3380 CXXCtorInitializer **initializer = 3381 new (Context) CXXCtorInitializer*[1]; 3382 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3383 Constructor->setCtorInitializers(initializer); 3384 3385 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3386 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3387 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3388 } 3389 3390 DelegatingCtorDecls.push_back(Constructor); 3391 3392 return false; 3393} 3394 3395bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3396 ArrayRef<CXXCtorInitializer *> Initializers) { 3397 if (Constructor->isDependentContext()) { 3398 // Just store the initializers as written, they will be checked during 3399 // instantiation. 3400 if (!Initializers.empty()) { 3401 Constructor->setNumCtorInitializers(Initializers.size()); 3402 CXXCtorInitializer **baseOrMemberInitializers = 3403 new (Context) CXXCtorInitializer*[Initializers.size()]; 3404 memcpy(baseOrMemberInitializers, Initializers.data(), 3405 Initializers.size() * sizeof(CXXCtorInitializer*)); 3406 Constructor->setCtorInitializers(baseOrMemberInitializers); 3407 } 3408 3409 // Let template instantiation know whether we had errors. 3410 if (AnyErrors) 3411 Constructor->setInvalidDecl(); 3412 3413 return false; 3414 } 3415 3416 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3417 3418 // We need to build the initializer AST according to order of construction 3419 // and not what user specified in the Initializers list. 3420 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3421 if (!ClassDecl) 3422 return true; 3423 3424 bool HadError = false; 3425 3426 for (unsigned i = 0; i < Initializers.size(); i++) { 3427 CXXCtorInitializer *Member = Initializers[i]; 3428 3429 if (Member->isBaseInitializer()) 3430 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3431 else 3432 Info.AllBaseFields[Member->getAnyMember()] = Member; 3433 } 3434 3435 // Keep track of the direct virtual bases. 3436 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3437 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3438 E = ClassDecl->bases_end(); I != E; ++I) { 3439 if (I->isVirtual()) 3440 DirectVBases.insert(I); 3441 } 3442 3443 // Push virtual bases before others. 3444 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3445 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3446 3447 if (CXXCtorInitializer *Value 3448 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3449 // [class.base.init]p7, per DR257: 3450 // A mem-initializer where the mem-initializer-id names a virtual base 3451 // class is ignored during execution of a constructor of any class that 3452 // is not the most derived class. 3453 if (ClassDecl->isAbstract()) { 3454 // FIXME: Provide a fixit to remove the base specifier. This requires 3455 // tracking the location of the associated comma for a base specifier. 3456 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) 3457 << VBase->getType() << ClassDecl; 3458 DiagnoseAbstractType(ClassDecl); 3459 } 3460 3461 Info.AllToInit.push_back(Value); 3462 } else if (!AnyErrors && !ClassDecl->isAbstract()) { 3463 // [class.base.init]p8, per DR257: 3464 // If a given [...] base class is not named by a mem-initializer-id 3465 // [...] and the entity is not a virtual base class of an abstract 3466 // class, then [...] the entity is default-initialized. 3467 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3468 CXXCtorInitializer *CXXBaseInit; 3469 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3470 VBase, IsInheritedVirtualBase, 3471 CXXBaseInit)) { 3472 HadError = true; 3473 continue; 3474 } 3475 3476 Info.AllToInit.push_back(CXXBaseInit); 3477 } 3478 } 3479 3480 // Non-virtual bases. 3481 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3482 E = ClassDecl->bases_end(); Base != E; ++Base) { 3483 // Virtuals are in the virtual base list and already constructed. 3484 if (Base->isVirtual()) 3485 continue; 3486 3487 if (CXXCtorInitializer *Value 3488 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3489 Info.AllToInit.push_back(Value); 3490 } else if (!AnyErrors) { 3491 CXXCtorInitializer *CXXBaseInit; 3492 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3493 Base, /*IsInheritedVirtualBase=*/false, 3494 CXXBaseInit)) { 3495 HadError = true; 3496 continue; 3497 } 3498 3499 Info.AllToInit.push_back(CXXBaseInit); 3500 } 3501 } 3502 3503 // Fields. 3504 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3505 MemEnd = ClassDecl->decls_end(); 3506 Mem != MemEnd; ++Mem) { 3507 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3508 // C++ [class.bit]p2: 3509 // A declaration for a bit-field that omits the identifier declares an 3510 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3511 // initialized. 3512 if (F->isUnnamedBitfield()) 3513 continue; 3514 3515 // If we're not generating the implicit copy/move constructor, then we'll 3516 // handle anonymous struct/union fields based on their individual 3517 // indirect fields. 3518 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3519 continue; 3520 3521 if (CollectFieldInitializer(*this, Info, F)) 3522 HadError = true; 3523 continue; 3524 } 3525 3526 // Beyond this point, we only consider default initialization. 3527 if (Info.isImplicitCopyOrMove()) 3528 continue; 3529 3530 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3531 if (F->getType()->isIncompleteArrayType()) { 3532 assert(ClassDecl->hasFlexibleArrayMember() && 3533 "Incomplete array type is not valid"); 3534 continue; 3535 } 3536 3537 // Initialize each field of an anonymous struct individually. 3538 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3539 HadError = true; 3540 3541 continue; 3542 } 3543 } 3544 3545 unsigned NumInitializers = Info.AllToInit.size(); 3546 if (NumInitializers > 0) { 3547 Constructor->setNumCtorInitializers(NumInitializers); 3548 CXXCtorInitializer **baseOrMemberInitializers = 3549 new (Context) CXXCtorInitializer*[NumInitializers]; 3550 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3551 NumInitializers * sizeof(CXXCtorInitializer*)); 3552 Constructor->setCtorInitializers(baseOrMemberInitializers); 3553 3554 // Constructors implicitly reference the base and member 3555 // destructors. 3556 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3557 Constructor->getParent()); 3558 } 3559 3560 return HadError; 3561} 3562 3563static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3564 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3565 const RecordDecl *RD = RT->getDecl(); 3566 if (RD->isAnonymousStructOrUnion()) { 3567 for (RecordDecl::field_iterator Field = RD->field_begin(), 3568 E = RD->field_end(); Field != E; ++Field) 3569 PopulateKeysForFields(*Field, IdealInits); 3570 return; 3571 } 3572 } 3573 IdealInits.push_back(Field); 3574} 3575 3576static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3577 return Context.getCanonicalType(BaseType).getTypePtr(); 3578} 3579 3580static const void *GetKeyForMember(ASTContext &Context, 3581 CXXCtorInitializer *Member) { 3582 if (!Member->isAnyMemberInitializer()) 3583 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3584 3585 return Member->getAnyMember(); 3586} 3587 3588static void DiagnoseBaseOrMemInitializerOrder( 3589 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3590 ArrayRef<CXXCtorInitializer *> Inits) { 3591 if (Constructor->getDeclContext()->isDependentContext()) 3592 return; 3593 3594 // Don't check initializers order unless the warning is enabled at the 3595 // location of at least one initializer. 3596 bool ShouldCheckOrder = false; 3597 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3598 CXXCtorInitializer *Init = Inits[InitIndex]; 3599 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3600 Init->getSourceLocation()) 3601 != DiagnosticsEngine::Ignored) { 3602 ShouldCheckOrder = true; 3603 break; 3604 } 3605 } 3606 if (!ShouldCheckOrder) 3607 return; 3608 3609 // Build the list of bases and members in the order that they'll 3610 // actually be initialized. The explicit initializers should be in 3611 // this same order but may be missing things. 3612 SmallVector<const void*, 32> IdealInitKeys; 3613 3614 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3615 3616 // 1. Virtual bases. 3617 for (CXXRecordDecl::base_class_const_iterator VBase = 3618 ClassDecl->vbases_begin(), 3619 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3620 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3621 3622 // 2. Non-virtual bases. 3623 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3624 E = ClassDecl->bases_end(); Base != E; ++Base) { 3625 if (Base->isVirtual()) 3626 continue; 3627 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3628 } 3629 3630 // 3. Direct fields. 3631 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3632 E = ClassDecl->field_end(); Field != E; ++Field) { 3633 if (Field->isUnnamedBitfield()) 3634 continue; 3635 3636 PopulateKeysForFields(*Field, IdealInitKeys); 3637 } 3638 3639 unsigned NumIdealInits = IdealInitKeys.size(); 3640 unsigned IdealIndex = 0; 3641 3642 CXXCtorInitializer *PrevInit = 0; 3643 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3644 CXXCtorInitializer *Init = Inits[InitIndex]; 3645 const void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3646 3647 // Scan forward to try to find this initializer in the idealized 3648 // initializers list. 3649 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3650 if (InitKey == IdealInitKeys[IdealIndex]) 3651 break; 3652 3653 // If we didn't find this initializer, it must be because we 3654 // scanned past it on a previous iteration. That can only 3655 // happen if we're out of order; emit a warning. 3656 if (IdealIndex == NumIdealInits && PrevInit) { 3657 Sema::SemaDiagnosticBuilder D = 3658 SemaRef.Diag(PrevInit->getSourceLocation(), 3659 diag::warn_initializer_out_of_order); 3660 3661 if (PrevInit->isAnyMemberInitializer()) 3662 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3663 else 3664 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3665 3666 if (Init->isAnyMemberInitializer()) 3667 D << 0 << Init->getAnyMember()->getDeclName(); 3668 else 3669 D << 1 << Init->getTypeSourceInfo()->getType(); 3670 3671 // Move back to the initializer's location in the ideal list. 3672 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3673 if (InitKey == IdealInitKeys[IdealIndex]) 3674 break; 3675 3676 assert(IdealIndex != NumIdealInits && 3677 "initializer not found in initializer list"); 3678 } 3679 3680 PrevInit = Init; 3681 } 3682} 3683 3684namespace { 3685bool CheckRedundantInit(Sema &S, 3686 CXXCtorInitializer *Init, 3687 CXXCtorInitializer *&PrevInit) { 3688 if (!PrevInit) { 3689 PrevInit = Init; 3690 return false; 3691 } 3692 3693 if (FieldDecl *Field = Init->getAnyMember()) 3694 S.Diag(Init->getSourceLocation(), 3695 diag::err_multiple_mem_initialization) 3696 << Field->getDeclName() 3697 << Init->getSourceRange(); 3698 else { 3699 const Type *BaseClass = Init->getBaseClass(); 3700 assert(BaseClass && "neither field nor base"); 3701 S.Diag(Init->getSourceLocation(), 3702 diag::err_multiple_base_initialization) 3703 << QualType(BaseClass, 0) 3704 << Init->getSourceRange(); 3705 } 3706 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3707 << 0 << PrevInit->getSourceRange(); 3708 3709 return true; 3710} 3711 3712typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3713typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3714 3715bool CheckRedundantUnionInit(Sema &S, 3716 CXXCtorInitializer *Init, 3717 RedundantUnionMap &Unions) { 3718 FieldDecl *Field = Init->getAnyMember(); 3719 RecordDecl *Parent = Field->getParent(); 3720 NamedDecl *Child = Field; 3721 3722 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3723 if (Parent->isUnion()) { 3724 UnionEntry &En = Unions[Parent]; 3725 if (En.first && En.first != Child) { 3726 S.Diag(Init->getSourceLocation(), 3727 diag::err_multiple_mem_union_initialization) 3728 << Field->getDeclName() 3729 << Init->getSourceRange(); 3730 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3731 << 0 << En.second->getSourceRange(); 3732 return true; 3733 } 3734 if (!En.first) { 3735 En.first = Child; 3736 En.second = Init; 3737 } 3738 if (!Parent->isAnonymousStructOrUnion()) 3739 return false; 3740 } 3741 3742 Child = Parent; 3743 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3744 } 3745 3746 return false; 3747} 3748} 3749 3750// Diagnose value-uses of fields to initialize themselves, e.g. 3751// foo(foo) 3752// where foo is not also a parameter to the constructor. 3753// Also diagnose across field uninitialized use such as 3754// x(y), y(x) 3755// TODO: implement -Wuninitialized and fold this into that framework. 3756static void DiagnoseUnitializedFields( 3757 Sema &SemaRef, const CXXConstructorDecl *Constructor) { 3758 3759 if (SemaRef.getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, 3760 Constructor->getLocation()) 3761 == DiagnosticsEngine::Ignored) { 3762 return; 3763 } 3764 3765 const CXXRecordDecl *RD = Constructor->getParent(); 3766 3767 // Holds fields that are uninitialized. 3768 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; 3769 3770 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end(); 3771 I != E; ++I) { 3772 if (FieldDecl *FD = dyn_cast<FieldDecl>(*I)) { 3773 UninitializedFields.insert(FD); 3774 } else if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) { 3775 UninitializedFields.insert(IFD->getAnonField()); 3776 } 3777 } 3778 3779 // Fields already checked when processing the in class initializers. 3780 llvm::SmallPtrSet<ValueDecl*, 4> 3781 InClassUninitializedFields = UninitializedFields; 3782 3783 for (CXXConstructorDecl::init_const_iterator FieldInit = 3784 Constructor->init_begin(), 3785 FieldInitEnd = Constructor->init_end(); 3786 FieldInit != FieldInitEnd; ++FieldInit) { 3787 3788 FieldDecl *Field = (*FieldInit)->getAnyMember(); 3789 Expr *InitExpr = (*FieldInit)->getInit(); 3790 3791 if (!Field) { 3792 CheckInitExprContainsUninitializedFields( 3793 SemaRef, InitExpr, 0, UninitializedFields, 3794 false/*WarnOnSelfReference*/); 3795 continue; 3796 } 3797 3798 if (CXXDefaultInitExpr *Default = dyn_cast<CXXDefaultInitExpr>(InitExpr)) { 3799 // This field is initialized with an in-class initailzer. Remove the 3800 // fields already checked to prevent duplicate warnings. 3801 llvm::SmallPtrSet<ValueDecl*, 4> DiffSet = UninitializedFields; 3802 for (llvm::SmallPtrSet<ValueDecl*, 4>::iterator 3803 I = InClassUninitializedFields.begin(), 3804 E = InClassUninitializedFields.end(); 3805 I != E; ++I) { 3806 DiffSet.erase(*I); 3807 } 3808 CheckInitExprContainsUninitializedFields( 3809 SemaRef, Default->getExpr(), Field, DiffSet, 3810 DiffSet.count(Field), Constructor); 3811 3812 // Update the unitialized field sets. 3813 CheckInitExprContainsUninitializedFields( 3814 SemaRef, Default->getExpr(), 0, UninitializedFields, 3815 false); 3816 CheckInitExprContainsUninitializedFields( 3817 SemaRef, Default->getExpr(), 0, InClassUninitializedFields, 3818 false); 3819 } else { 3820 CheckInitExprContainsUninitializedFields( 3821 SemaRef, InitExpr, Field, UninitializedFields, 3822 UninitializedFields.count(Field)); 3823 if (Expr* InClassInit = Field->getInClassInitializer()) { 3824 CheckInitExprContainsUninitializedFields( 3825 SemaRef, InClassInit, 0, InClassUninitializedFields, 3826 false); 3827 } 3828 } 3829 UninitializedFields.erase(Field); 3830 InClassUninitializedFields.erase(Field); 3831 } 3832} 3833 3834/// ActOnMemInitializers - Handle the member initializers for a constructor. 3835void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3836 SourceLocation ColonLoc, 3837 ArrayRef<CXXCtorInitializer*> MemInits, 3838 bool AnyErrors) { 3839 if (!ConstructorDecl) 3840 return; 3841 3842 AdjustDeclIfTemplate(ConstructorDecl); 3843 3844 CXXConstructorDecl *Constructor 3845 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3846 3847 if (!Constructor) { 3848 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3849 return; 3850 } 3851 3852 // Mapping for the duplicate initializers check. 3853 // For member initializers, this is keyed with a FieldDecl*. 3854 // For base initializers, this is keyed with a Type*. 3855 llvm::DenseMap<const void *, CXXCtorInitializer *> Members; 3856 3857 // Mapping for the inconsistent anonymous-union initializers check. 3858 RedundantUnionMap MemberUnions; 3859 3860 bool HadError = false; 3861 for (unsigned i = 0; i < MemInits.size(); i++) { 3862 CXXCtorInitializer *Init = MemInits[i]; 3863 3864 // Set the source order index. 3865 Init->setSourceOrder(i); 3866 3867 if (Init->isAnyMemberInitializer()) { 3868 FieldDecl *Field = Init->getAnyMember(); 3869 if (CheckRedundantInit(*this, Init, Members[Field]) || 3870 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3871 HadError = true; 3872 } else if (Init->isBaseInitializer()) { 3873 const void *Key = 3874 GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3875 if (CheckRedundantInit(*this, Init, Members[Key])) 3876 HadError = true; 3877 } else { 3878 assert(Init->isDelegatingInitializer()); 3879 // This must be the only initializer 3880 if (MemInits.size() != 1) { 3881 Diag(Init->getSourceLocation(), 3882 diag::err_delegating_initializer_alone) 3883 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3884 // We will treat this as being the only initializer. 3885 } 3886 SetDelegatingInitializer(Constructor, MemInits[i]); 3887 // Return immediately as the initializer is set. 3888 return; 3889 } 3890 } 3891 3892 if (HadError) 3893 return; 3894 3895 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3896 3897 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3898 3899 DiagnoseUnitializedFields(*this, Constructor); 3900} 3901 3902void 3903Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3904 CXXRecordDecl *ClassDecl) { 3905 // Ignore dependent contexts. Also ignore unions, since their members never 3906 // have destructors implicitly called. 3907 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3908 return; 3909 3910 // FIXME: all the access-control diagnostics are positioned on the 3911 // field/base declaration. That's probably good; that said, the 3912 // user might reasonably want to know why the destructor is being 3913 // emitted, and we currently don't say. 3914 3915 // Non-static data members. 3916 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3917 E = ClassDecl->field_end(); I != E; ++I) { 3918 FieldDecl *Field = *I; 3919 if (Field->isInvalidDecl()) 3920 continue; 3921 3922 // Don't destroy incomplete or zero-length arrays. 3923 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3924 continue; 3925 3926 QualType FieldType = Context.getBaseElementType(Field->getType()); 3927 3928 const RecordType* RT = FieldType->getAs<RecordType>(); 3929 if (!RT) 3930 continue; 3931 3932 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3933 if (FieldClassDecl->isInvalidDecl()) 3934 continue; 3935 if (FieldClassDecl->hasIrrelevantDestructor()) 3936 continue; 3937 // The destructor for an implicit anonymous union member is never invoked. 3938 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3939 continue; 3940 3941 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3942 assert(Dtor && "No dtor found for FieldClassDecl!"); 3943 CheckDestructorAccess(Field->getLocation(), Dtor, 3944 PDiag(diag::err_access_dtor_field) 3945 << Field->getDeclName() 3946 << FieldType); 3947 3948 MarkFunctionReferenced(Location, Dtor); 3949 DiagnoseUseOfDecl(Dtor, Location); 3950 } 3951 3952 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3953 3954 // Bases. 3955 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3956 E = ClassDecl->bases_end(); Base != E; ++Base) { 3957 // Bases are always records in a well-formed non-dependent class. 3958 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3959 3960 // Remember direct virtual bases. 3961 if (Base->isVirtual()) 3962 DirectVirtualBases.insert(RT); 3963 3964 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3965 // If our base class is invalid, we probably can't get its dtor anyway. 3966 if (BaseClassDecl->isInvalidDecl()) 3967 continue; 3968 if (BaseClassDecl->hasIrrelevantDestructor()) 3969 continue; 3970 3971 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3972 assert(Dtor && "No dtor found for BaseClassDecl!"); 3973 3974 // FIXME: caret should be on the start of the class name 3975 CheckDestructorAccess(Base->getLocStart(), Dtor, 3976 PDiag(diag::err_access_dtor_base) 3977 << Base->getType() 3978 << Base->getSourceRange(), 3979 Context.getTypeDeclType(ClassDecl)); 3980 3981 MarkFunctionReferenced(Location, Dtor); 3982 DiagnoseUseOfDecl(Dtor, Location); 3983 } 3984 3985 // Virtual bases. 3986 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3987 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3988 3989 // Bases are always records in a well-formed non-dependent class. 3990 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3991 3992 // Ignore direct virtual bases. 3993 if (DirectVirtualBases.count(RT)) 3994 continue; 3995 3996 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3997 // If our base class is invalid, we probably can't get its dtor anyway. 3998 if (BaseClassDecl->isInvalidDecl()) 3999 continue; 4000 if (BaseClassDecl->hasIrrelevantDestructor()) 4001 continue; 4002 4003 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 4004 assert(Dtor && "No dtor found for BaseClassDecl!"); 4005 if (CheckDestructorAccess( 4006 ClassDecl->getLocation(), Dtor, 4007 PDiag(diag::err_access_dtor_vbase) 4008 << Context.getTypeDeclType(ClassDecl) << VBase->getType(), 4009 Context.getTypeDeclType(ClassDecl)) == 4010 AR_accessible) { 4011 CheckDerivedToBaseConversion( 4012 Context.getTypeDeclType(ClassDecl), VBase->getType(), 4013 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), 4014 SourceRange(), DeclarationName(), 0); 4015 } 4016 4017 MarkFunctionReferenced(Location, Dtor); 4018 DiagnoseUseOfDecl(Dtor, Location); 4019 } 4020} 4021 4022void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 4023 if (!CDtorDecl) 4024 return; 4025 4026 if (CXXConstructorDecl *Constructor 4027 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 4028 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 4029} 4030 4031bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 4032 unsigned DiagID, AbstractDiagSelID SelID) { 4033 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 4034 unsigned DiagID; 4035 AbstractDiagSelID SelID; 4036 4037 public: 4038 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 4039 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 4040 4041 void diagnose(Sema &S, SourceLocation Loc, QualType T) LLVM_OVERRIDE { 4042 if (Suppressed) return; 4043 if (SelID == -1) 4044 S.Diag(Loc, DiagID) << T; 4045 else 4046 S.Diag(Loc, DiagID) << SelID << T; 4047 } 4048 } Diagnoser(DiagID, SelID); 4049 4050 return RequireNonAbstractType(Loc, T, Diagnoser); 4051} 4052 4053bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 4054 TypeDiagnoser &Diagnoser) { 4055 if (!getLangOpts().CPlusPlus) 4056 return false; 4057 4058 if (const ArrayType *AT = Context.getAsArrayType(T)) 4059 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 4060 4061 if (const PointerType *PT = T->getAs<PointerType>()) { 4062 // Find the innermost pointer type. 4063 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 4064 PT = T; 4065 4066 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 4067 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 4068 } 4069 4070 const RecordType *RT = T->getAs<RecordType>(); 4071 if (!RT) 4072 return false; 4073 4074 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4075 4076 // We can't answer whether something is abstract until it has a 4077 // definition. If it's currently being defined, we'll walk back 4078 // over all the declarations when we have a full definition. 4079 const CXXRecordDecl *Def = RD->getDefinition(); 4080 if (!Def || Def->isBeingDefined()) 4081 return false; 4082 4083 if (!RD->isAbstract()) 4084 return false; 4085 4086 Diagnoser.diagnose(*this, Loc, T); 4087 DiagnoseAbstractType(RD); 4088 4089 return true; 4090} 4091 4092void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 4093 // Check if we've already emitted the list of pure virtual functions 4094 // for this class. 4095 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 4096 return; 4097 4098 // If the diagnostic is suppressed, don't emit the notes. We're only 4099 // going to emit them once, so try to attach them to a diagnostic we're 4100 // actually going to show. 4101 if (Diags.isLastDiagnosticIgnored()) 4102 return; 4103 4104 CXXFinalOverriderMap FinalOverriders; 4105 RD->getFinalOverriders(FinalOverriders); 4106 4107 // Keep a set of seen pure methods so we won't diagnose the same method 4108 // more than once. 4109 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 4110 4111 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 4112 MEnd = FinalOverriders.end(); 4113 M != MEnd; 4114 ++M) { 4115 for (OverridingMethods::iterator SO = M->second.begin(), 4116 SOEnd = M->second.end(); 4117 SO != SOEnd; ++SO) { 4118 // C++ [class.abstract]p4: 4119 // A class is abstract if it contains or inherits at least one 4120 // pure virtual function for which the final overrider is pure 4121 // virtual. 4122 4123 // 4124 if (SO->second.size() != 1) 4125 continue; 4126 4127 if (!SO->second.front().Method->isPure()) 4128 continue; 4129 4130 if (!SeenPureMethods.insert(SO->second.front().Method)) 4131 continue; 4132 4133 Diag(SO->second.front().Method->getLocation(), 4134 diag::note_pure_virtual_function) 4135 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 4136 } 4137 } 4138 4139 if (!PureVirtualClassDiagSet) 4140 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 4141 PureVirtualClassDiagSet->insert(RD); 4142} 4143 4144namespace { 4145struct AbstractUsageInfo { 4146 Sema &S; 4147 CXXRecordDecl *Record; 4148 CanQualType AbstractType; 4149 bool Invalid; 4150 4151 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 4152 : S(S), Record(Record), 4153 AbstractType(S.Context.getCanonicalType( 4154 S.Context.getTypeDeclType(Record))), 4155 Invalid(false) {} 4156 4157 void DiagnoseAbstractType() { 4158 if (Invalid) return; 4159 S.DiagnoseAbstractType(Record); 4160 Invalid = true; 4161 } 4162 4163 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 4164}; 4165 4166struct CheckAbstractUsage { 4167 AbstractUsageInfo &Info; 4168 const NamedDecl *Ctx; 4169 4170 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 4171 : Info(Info), Ctx(Ctx) {} 4172 4173 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4174 switch (TL.getTypeLocClass()) { 4175#define ABSTRACT_TYPELOC(CLASS, PARENT) 4176#define TYPELOC(CLASS, PARENT) \ 4177 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 4178#include "clang/AST/TypeLocNodes.def" 4179 } 4180 } 4181 4182 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4183 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 4184 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4185 if (!TL.getArg(I)) 4186 continue; 4187 4188 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 4189 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 4190 } 4191 } 4192 4193 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4194 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 4195 } 4196 4197 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4198 // Visit the type parameters from a permissive context. 4199 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4200 TemplateArgumentLoc TAL = TL.getArgLoc(I); 4201 if (TAL.getArgument().getKind() == TemplateArgument::Type) 4202 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 4203 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 4204 // TODO: other template argument types? 4205 } 4206 } 4207 4208 // Visit pointee types from a permissive context. 4209#define CheckPolymorphic(Type) \ 4210 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 4211 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 4212 } 4213 CheckPolymorphic(PointerTypeLoc) 4214 CheckPolymorphic(ReferenceTypeLoc) 4215 CheckPolymorphic(MemberPointerTypeLoc) 4216 CheckPolymorphic(BlockPointerTypeLoc) 4217 CheckPolymorphic(AtomicTypeLoc) 4218 4219 /// Handle all the types we haven't given a more specific 4220 /// implementation for above. 4221 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4222 // Every other kind of type that we haven't called out already 4223 // that has an inner type is either (1) sugar or (2) contains that 4224 // inner type in some way as a subobject. 4225 if (TypeLoc Next = TL.getNextTypeLoc()) 4226 return Visit(Next, Sel); 4227 4228 // If there's no inner type and we're in a permissive context, 4229 // don't diagnose. 4230 if (Sel == Sema::AbstractNone) return; 4231 4232 // Check whether the type matches the abstract type. 4233 QualType T = TL.getType(); 4234 if (T->isArrayType()) { 4235 Sel = Sema::AbstractArrayType; 4236 T = Info.S.Context.getBaseElementType(T); 4237 } 4238 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4239 if (CT != Info.AbstractType) return; 4240 4241 // It matched; do some magic. 4242 if (Sel == Sema::AbstractArrayType) { 4243 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4244 << T << TL.getSourceRange(); 4245 } else { 4246 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4247 << Sel << T << TL.getSourceRange(); 4248 } 4249 Info.DiagnoseAbstractType(); 4250 } 4251}; 4252 4253void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4254 Sema::AbstractDiagSelID Sel) { 4255 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4256} 4257 4258} 4259 4260/// Check for invalid uses of an abstract type in a method declaration. 4261static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4262 CXXMethodDecl *MD) { 4263 // No need to do the check on definitions, which require that 4264 // the return/param types be complete. 4265 if (MD->doesThisDeclarationHaveABody()) 4266 return; 4267 4268 // For safety's sake, just ignore it if we don't have type source 4269 // information. This should never happen for non-implicit methods, 4270 // but... 4271 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4272 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4273} 4274 4275/// Check for invalid uses of an abstract type within a class definition. 4276static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4277 CXXRecordDecl *RD) { 4278 for (CXXRecordDecl::decl_iterator 4279 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4280 Decl *D = *I; 4281 if (D->isImplicit()) continue; 4282 4283 // Methods and method templates. 4284 if (isa<CXXMethodDecl>(D)) { 4285 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4286 } else if (isa<FunctionTemplateDecl>(D)) { 4287 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4288 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4289 4290 // Fields and static variables. 4291 } else if (isa<FieldDecl>(D)) { 4292 FieldDecl *FD = cast<FieldDecl>(D); 4293 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4294 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4295 } else if (isa<VarDecl>(D)) { 4296 VarDecl *VD = cast<VarDecl>(D); 4297 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4298 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4299 4300 // Nested classes and class templates. 4301 } else if (isa<CXXRecordDecl>(D)) { 4302 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4303 } else if (isa<ClassTemplateDecl>(D)) { 4304 CheckAbstractClassUsage(Info, 4305 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4306 } 4307 } 4308} 4309 4310/// \brief Perform semantic checks on a class definition that has been 4311/// completing, introducing implicitly-declared members, checking for 4312/// abstract types, etc. 4313void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4314 if (!Record) 4315 return; 4316 4317 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4318 AbstractUsageInfo Info(*this, Record); 4319 CheckAbstractClassUsage(Info, Record); 4320 } 4321 4322 // If this is not an aggregate type and has no user-declared constructor, 4323 // complain about any non-static data members of reference or const scalar 4324 // type, since they will never get initializers. 4325 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4326 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4327 !Record->isLambda()) { 4328 bool Complained = false; 4329 for (RecordDecl::field_iterator F = Record->field_begin(), 4330 FEnd = Record->field_end(); 4331 F != FEnd; ++F) { 4332 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4333 continue; 4334 4335 if (F->getType()->isReferenceType() || 4336 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4337 if (!Complained) { 4338 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4339 << Record->getTagKind() << Record; 4340 Complained = true; 4341 } 4342 4343 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4344 << F->getType()->isReferenceType() 4345 << F->getDeclName(); 4346 } 4347 } 4348 } 4349 4350 if (Record->isDynamicClass() && !Record->isDependentType()) 4351 DynamicClasses.push_back(Record); 4352 4353 if (Record->getIdentifier()) { 4354 // C++ [class.mem]p13: 4355 // If T is the name of a class, then each of the following shall have a 4356 // name different from T: 4357 // - every member of every anonymous union that is a member of class T. 4358 // 4359 // C++ [class.mem]p14: 4360 // In addition, if class T has a user-declared constructor (12.1), every 4361 // non-static data member of class T shall have a name different from T. 4362 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4363 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4364 ++I) { 4365 NamedDecl *D = *I; 4366 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4367 isa<IndirectFieldDecl>(D)) { 4368 Diag(D->getLocation(), diag::err_member_name_of_class) 4369 << D->getDeclName(); 4370 break; 4371 } 4372 } 4373 } 4374 4375 // Warn if the class has virtual methods but non-virtual public destructor. 4376 if (Record->isPolymorphic() && !Record->isDependentType()) { 4377 CXXDestructorDecl *dtor = Record->getDestructor(); 4378 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4379 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4380 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4381 } 4382 4383 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4384 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4385 DiagnoseAbstractType(Record); 4386 } 4387 4388 if (!Record->isDependentType()) { 4389 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4390 MEnd = Record->method_end(); 4391 M != MEnd; ++M) { 4392 // See if a method overloads virtual methods in a base 4393 // class without overriding any. 4394 if (!M->isStatic()) 4395 DiagnoseHiddenVirtualMethods(*M); 4396 4397 // Check whether the explicitly-defaulted special members are valid. 4398 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4399 CheckExplicitlyDefaultedSpecialMember(*M); 4400 4401 // For an explicitly defaulted or deleted special member, we defer 4402 // determining triviality until the class is complete. That time is now! 4403 if (!M->isImplicit() && !M->isUserProvided()) { 4404 CXXSpecialMember CSM = getSpecialMember(*M); 4405 if (CSM != CXXInvalid) { 4406 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4407 4408 // Inform the class that we've finished declaring this member. 4409 Record->finishedDefaultedOrDeletedMember(*M); 4410 } 4411 } 4412 } 4413 } 4414 4415 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4416 // function that is not a constructor declares that member function to be 4417 // const. [...] The class of which that function is a member shall be 4418 // a literal type. 4419 // 4420 // If the class has virtual bases, any constexpr members will already have 4421 // been diagnosed by the checks performed on the member declaration, so 4422 // suppress this (less useful) diagnostic. 4423 // 4424 // We delay this until we know whether an explicitly-defaulted (or deleted) 4425 // destructor for the class is trivial. 4426 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4427 !Record->isLiteral() && !Record->getNumVBases()) { 4428 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4429 MEnd = Record->method_end(); 4430 M != MEnd; ++M) { 4431 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4432 switch (Record->getTemplateSpecializationKind()) { 4433 case TSK_ImplicitInstantiation: 4434 case TSK_ExplicitInstantiationDeclaration: 4435 case TSK_ExplicitInstantiationDefinition: 4436 // If a template instantiates to a non-literal type, but its members 4437 // instantiate to constexpr functions, the template is technically 4438 // ill-formed, but we allow it for sanity. 4439 continue; 4440 4441 case TSK_Undeclared: 4442 case TSK_ExplicitSpecialization: 4443 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4444 diag::err_constexpr_method_non_literal); 4445 break; 4446 } 4447 4448 // Only produce one error per class. 4449 break; 4450 } 4451 } 4452 } 4453 4454 // Check to see if we're trying to lay out a struct using the ms_struct 4455 // attribute that is dynamic. 4456 if (Record->isMsStruct(Context) && Record->isDynamicClass()) { 4457 Diag(Record->getLocation(), diag::warn_pragma_ms_struct_failed); 4458 Record->dropAttr<MsStructAttr>(); 4459 } 4460 4461 // Declare inheriting constructors. We do this eagerly here because: 4462 // - The standard requires an eager diagnostic for conflicting inheriting 4463 // constructors from different classes. 4464 // - The lazy declaration of the other implicit constructors is so as to not 4465 // waste space and performance on classes that are not meant to be 4466 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4467 // have inheriting constructors. 4468 DeclareInheritingConstructors(Record); 4469} 4470 4471/// Is the special member function which would be selected to perform the 4472/// specified operation on the specified class type a constexpr constructor? 4473static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4474 Sema::CXXSpecialMember CSM, 4475 bool ConstArg) { 4476 Sema::SpecialMemberOverloadResult *SMOR = 4477 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4478 false, false, false, false); 4479 if (!SMOR || !SMOR->getMethod()) 4480 // A constructor we wouldn't select can't be "involved in initializing" 4481 // anything. 4482 return true; 4483 return SMOR->getMethod()->isConstexpr(); 4484} 4485 4486/// Determine whether the specified special member function would be constexpr 4487/// if it were implicitly defined. 4488static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4489 Sema::CXXSpecialMember CSM, 4490 bool ConstArg) { 4491 if (!S.getLangOpts().CPlusPlus11) 4492 return false; 4493 4494 // C++11 [dcl.constexpr]p4: 4495 // In the definition of a constexpr constructor [...] 4496 bool Ctor = true; 4497 switch (CSM) { 4498 case Sema::CXXDefaultConstructor: 4499 // Since default constructor lookup is essentially trivial (and cannot 4500 // involve, for instance, template instantiation), we compute whether a 4501 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4502 // 4503 // This is important for performance; we need to know whether the default 4504 // constructor is constexpr to determine whether the type is a literal type. 4505 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4506 4507 case Sema::CXXCopyConstructor: 4508 case Sema::CXXMoveConstructor: 4509 // For copy or move constructors, we need to perform overload resolution. 4510 break; 4511 4512 case Sema::CXXCopyAssignment: 4513 case Sema::CXXMoveAssignment: 4514 if (!S.getLangOpts().CPlusPlus1y) 4515 return false; 4516 // In C++1y, we need to perform overload resolution. 4517 Ctor = false; 4518 break; 4519 4520 case Sema::CXXDestructor: 4521 case Sema::CXXInvalid: 4522 return false; 4523 } 4524 4525 // -- if the class is a non-empty union, or for each non-empty anonymous 4526 // union member of a non-union class, exactly one non-static data member 4527 // shall be initialized; [DR1359] 4528 // 4529 // If we squint, this is guaranteed, since exactly one non-static data member 4530 // will be initialized (if the constructor isn't deleted), we just don't know 4531 // which one. 4532 if (Ctor && ClassDecl->isUnion()) 4533 return true; 4534 4535 // -- the class shall not have any virtual base classes; 4536 if (Ctor && ClassDecl->getNumVBases()) 4537 return false; 4538 4539 // C++1y [class.copy]p26: 4540 // -- [the class] is a literal type, and 4541 if (!Ctor && !ClassDecl->isLiteral()) 4542 return false; 4543 4544 // -- every constructor involved in initializing [...] base class 4545 // sub-objects shall be a constexpr constructor; 4546 // -- the assignment operator selected to copy/move each direct base 4547 // class is a constexpr function, and 4548 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4549 BEnd = ClassDecl->bases_end(); 4550 B != BEnd; ++B) { 4551 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4552 if (!BaseType) continue; 4553 4554 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4555 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4556 return false; 4557 } 4558 4559 // -- every constructor involved in initializing non-static data members 4560 // [...] shall be a constexpr constructor; 4561 // -- every non-static data member and base class sub-object shall be 4562 // initialized 4563 // -- for each non-stastic data member of X that is of class type (or array 4564 // thereof), the assignment operator selected to copy/move that member is 4565 // a constexpr function 4566 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4567 FEnd = ClassDecl->field_end(); 4568 F != FEnd; ++F) { 4569 if (F->isInvalidDecl()) 4570 continue; 4571 if (const RecordType *RecordTy = 4572 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4573 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4574 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4575 return false; 4576 } 4577 } 4578 4579 // All OK, it's constexpr! 4580 return true; 4581} 4582 4583static Sema::ImplicitExceptionSpecification 4584computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4585 switch (S.getSpecialMember(MD)) { 4586 case Sema::CXXDefaultConstructor: 4587 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4588 case Sema::CXXCopyConstructor: 4589 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4590 case Sema::CXXCopyAssignment: 4591 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4592 case Sema::CXXMoveConstructor: 4593 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4594 case Sema::CXXMoveAssignment: 4595 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4596 case Sema::CXXDestructor: 4597 return S.ComputeDefaultedDtorExceptionSpec(MD); 4598 case Sema::CXXInvalid: 4599 break; 4600 } 4601 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4602 "only special members have implicit exception specs"); 4603 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4604} 4605 4606static void 4607updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4608 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4609 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4610 ExceptSpec.getEPI(EPI); 4611 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4612 FPT->getArgTypes(), EPI)); 4613} 4614 4615static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, 4616 CXXMethodDecl *MD) { 4617 FunctionProtoType::ExtProtoInfo EPI; 4618 4619 // Build an exception specification pointing back at this member. 4620 EPI.ExceptionSpecType = EST_Unevaluated; 4621 EPI.ExceptionSpecDecl = MD; 4622 4623 // Set the calling convention to the default for C++ instance methods. 4624 EPI.ExtInfo = EPI.ExtInfo.withCallingConv( 4625 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4626 /*IsCXXMethod=*/true)); 4627 return EPI; 4628} 4629 4630void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4631 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4632 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4633 return; 4634 4635 // Evaluate the exception specification. 4636 ImplicitExceptionSpecification ExceptSpec = 4637 computeImplicitExceptionSpec(*this, Loc, MD); 4638 4639 // Update the type of the special member to use it. 4640 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4641 4642 // A user-provided destructor can be defined outside the class. When that 4643 // happens, be sure to update the exception specification on both 4644 // declarations. 4645 const FunctionProtoType *CanonicalFPT = 4646 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4647 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4648 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4649 CanonicalFPT, ExceptSpec); 4650} 4651 4652void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4653 CXXRecordDecl *RD = MD->getParent(); 4654 CXXSpecialMember CSM = getSpecialMember(MD); 4655 4656 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4657 "not an explicitly-defaulted special member"); 4658 4659 // Whether this was the first-declared instance of the constructor. 4660 // This affects whether we implicitly add an exception spec and constexpr. 4661 bool First = MD == MD->getCanonicalDecl(); 4662 4663 bool HadError = false; 4664 4665 // C++11 [dcl.fct.def.default]p1: 4666 // A function that is explicitly defaulted shall 4667 // -- be a special member function (checked elsewhere), 4668 // -- have the same type (except for ref-qualifiers, and except that a 4669 // copy operation can take a non-const reference) as an implicit 4670 // declaration, and 4671 // -- not have default arguments. 4672 unsigned ExpectedParams = 1; 4673 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4674 ExpectedParams = 0; 4675 if (MD->getNumParams() != ExpectedParams) { 4676 // This also checks for default arguments: a copy or move constructor with a 4677 // default argument is classified as a default constructor, and assignment 4678 // operations and destructors can't have default arguments. 4679 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4680 << CSM << MD->getSourceRange(); 4681 HadError = true; 4682 } else if (MD->isVariadic()) { 4683 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4684 << CSM << MD->getSourceRange(); 4685 HadError = true; 4686 } 4687 4688 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4689 4690 bool CanHaveConstParam = false; 4691 if (CSM == CXXCopyConstructor) 4692 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4693 else if (CSM == CXXCopyAssignment) 4694 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4695 4696 QualType ReturnType = Context.VoidTy; 4697 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4698 // Check for return type matching. 4699 ReturnType = Type->getResultType(); 4700 QualType ExpectedReturnType = 4701 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4702 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4703 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4704 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4705 HadError = true; 4706 } 4707 4708 // A defaulted special member cannot have cv-qualifiers. 4709 if (Type->getTypeQuals()) { 4710 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4711 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4712 HadError = true; 4713 } 4714 } 4715 4716 // Check for parameter type matching. 4717 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4718 bool HasConstParam = false; 4719 if (ExpectedParams && ArgType->isReferenceType()) { 4720 // Argument must be reference to possibly-const T. 4721 QualType ReferentType = ArgType->getPointeeType(); 4722 HasConstParam = ReferentType.isConstQualified(); 4723 4724 if (ReferentType.isVolatileQualified()) { 4725 Diag(MD->getLocation(), 4726 diag::err_defaulted_special_member_volatile_param) << CSM; 4727 HadError = true; 4728 } 4729 4730 if (HasConstParam && !CanHaveConstParam) { 4731 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4732 Diag(MD->getLocation(), 4733 diag::err_defaulted_special_member_copy_const_param) 4734 << (CSM == CXXCopyAssignment); 4735 // FIXME: Explain why this special member can't be const. 4736 } else { 4737 Diag(MD->getLocation(), 4738 diag::err_defaulted_special_member_move_const_param) 4739 << (CSM == CXXMoveAssignment); 4740 } 4741 HadError = true; 4742 } 4743 } else if (ExpectedParams) { 4744 // A copy assignment operator can take its argument by value, but a 4745 // defaulted one cannot. 4746 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4747 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4748 HadError = true; 4749 } 4750 4751 // C++11 [dcl.fct.def.default]p2: 4752 // An explicitly-defaulted function may be declared constexpr only if it 4753 // would have been implicitly declared as constexpr, 4754 // Do not apply this rule to members of class templates, since core issue 1358 4755 // makes such functions always instantiate to constexpr functions. For 4756 // functions which cannot be constexpr (for non-constructors in C++11 and for 4757 // destructors in C++1y), this is checked elsewhere. 4758 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4759 HasConstParam); 4760 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4761 : isa<CXXConstructorDecl>(MD)) && 4762 MD->isConstexpr() && !Constexpr && 4763 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4764 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4765 // FIXME: Explain why the special member can't be constexpr. 4766 HadError = true; 4767 } 4768 4769 // and may have an explicit exception-specification only if it is compatible 4770 // with the exception-specification on the implicit declaration. 4771 if (Type->hasExceptionSpec()) { 4772 // Delay the check if this is the first declaration of the special member, 4773 // since we may not have parsed some necessary in-class initializers yet. 4774 if (First) { 4775 // If the exception specification needs to be instantiated, do so now, 4776 // before we clobber it with an EST_Unevaluated specification below. 4777 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4778 InstantiateExceptionSpec(MD->getLocStart(), MD); 4779 Type = MD->getType()->getAs<FunctionProtoType>(); 4780 } 4781 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4782 } else 4783 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4784 } 4785 4786 // If a function is explicitly defaulted on its first declaration, 4787 if (First) { 4788 // -- it is implicitly considered to be constexpr if the implicit 4789 // definition would be, 4790 MD->setConstexpr(Constexpr); 4791 4792 // -- it is implicitly considered to have the same exception-specification 4793 // as if it had been implicitly declared, 4794 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4795 EPI.ExceptionSpecType = EST_Unevaluated; 4796 EPI.ExceptionSpecDecl = MD; 4797 MD->setType(Context.getFunctionType(ReturnType, 4798 ArrayRef<QualType>(&ArgType, 4799 ExpectedParams), 4800 EPI)); 4801 } 4802 4803 if (ShouldDeleteSpecialMember(MD, CSM)) { 4804 if (First) { 4805 SetDeclDeleted(MD, MD->getLocation()); 4806 } else { 4807 // C++11 [dcl.fct.def.default]p4: 4808 // [For a] user-provided explicitly-defaulted function [...] if such a 4809 // function is implicitly defined as deleted, the program is ill-formed. 4810 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4811 HadError = true; 4812 } 4813 } 4814 4815 if (HadError) 4816 MD->setInvalidDecl(); 4817} 4818 4819/// Check whether the exception specification provided for an 4820/// explicitly-defaulted special member matches the exception specification 4821/// that would have been generated for an implicit special member, per 4822/// C++11 [dcl.fct.def.default]p2. 4823void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4824 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4825 // Compute the implicit exception specification. 4826 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4827 /*IsCXXMethod=*/true); 4828 FunctionProtoType::ExtProtoInfo EPI(CC); 4829 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4830 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4831 Context.getFunctionType(Context.VoidTy, None, EPI)); 4832 4833 // Ensure that it matches. 4834 CheckEquivalentExceptionSpec( 4835 PDiag(diag::err_incorrect_defaulted_exception_spec) 4836 << getSpecialMember(MD), PDiag(), 4837 ImplicitType, SourceLocation(), 4838 SpecifiedType, MD->getLocation()); 4839} 4840 4841void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4842 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4843 I != N; ++I) 4844 CheckExplicitlyDefaultedMemberExceptionSpec( 4845 DelayedDefaultedMemberExceptionSpecs[I].first, 4846 DelayedDefaultedMemberExceptionSpecs[I].second); 4847 4848 DelayedDefaultedMemberExceptionSpecs.clear(); 4849} 4850 4851namespace { 4852struct SpecialMemberDeletionInfo { 4853 Sema &S; 4854 CXXMethodDecl *MD; 4855 Sema::CXXSpecialMember CSM; 4856 bool Diagnose; 4857 4858 // Properties of the special member, computed for convenience. 4859 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4860 SourceLocation Loc; 4861 4862 bool AllFieldsAreConst; 4863 4864 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4865 Sema::CXXSpecialMember CSM, bool Diagnose) 4866 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4867 IsConstructor(false), IsAssignment(false), IsMove(false), 4868 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4869 AllFieldsAreConst(true) { 4870 switch (CSM) { 4871 case Sema::CXXDefaultConstructor: 4872 case Sema::CXXCopyConstructor: 4873 IsConstructor = true; 4874 break; 4875 case Sema::CXXMoveConstructor: 4876 IsConstructor = true; 4877 IsMove = true; 4878 break; 4879 case Sema::CXXCopyAssignment: 4880 IsAssignment = true; 4881 break; 4882 case Sema::CXXMoveAssignment: 4883 IsAssignment = true; 4884 IsMove = true; 4885 break; 4886 case Sema::CXXDestructor: 4887 break; 4888 case Sema::CXXInvalid: 4889 llvm_unreachable("invalid special member kind"); 4890 } 4891 4892 if (MD->getNumParams()) { 4893 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4894 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4895 } 4896 } 4897 4898 bool inUnion() const { return MD->getParent()->isUnion(); } 4899 4900 /// Look up the corresponding special member in the given class. 4901 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4902 unsigned Quals) { 4903 unsigned TQ = MD->getTypeQualifiers(); 4904 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4905 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4906 Quals = 0; 4907 return S.LookupSpecialMember(Class, CSM, 4908 ConstArg || (Quals & Qualifiers::Const), 4909 VolatileArg || (Quals & Qualifiers::Volatile), 4910 MD->getRefQualifier() == RQ_RValue, 4911 TQ & Qualifiers::Const, 4912 TQ & Qualifiers::Volatile); 4913 } 4914 4915 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4916 4917 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4918 bool shouldDeleteForField(FieldDecl *FD); 4919 bool shouldDeleteForAllConstMembers(); 4920 4921 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4922 unsigned Quals); 4923 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4924 Sema::SpecialMemberOverloadResult *SMOR, 4925 bool IsDtorCallInCtor); 4926 4927 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4928}; 4929} 4930 4931/// Is the given special member inaccessible when used on the given 4932/// sub-object. 4933bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4934 CXXMethodDecl *target) { 4935 /// If we're operating on a base class, the object type is the 4936 /// type of this special member. 4937 QualType objectTy; 4938 AccessSpecifier access = target->getAccess(); 4939 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4940 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4941 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4942 4943 // If we're operating on a field, the object type is the type of the field. 4944 } else { 4945 objectTy = S.Context.getTypeDeclType(target->getParent()); 4946 } 4947 4948 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4949} 4950 4951/// Check whether we should delete a special member due to the implicit 4952/// definition containing a call to a special member of a subobject. 4953bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4954 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4955 bool IsDtorCallInCtor) { 4956 CXXMethodDecl *Decl = SMOR->getMethod(); 4957 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4958 4959 int DiagKind = -1; 4960 4961 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4962 DiagKind = !Decl ? 0 : 1; 4963 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4964 DiagKind = 2; 4965 else if (!isAccessible(Subobj, Decl)) 4966 DiagKind = 3; 4967 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4968 !Decl->isTrivial()) { 4969 // A member of a union must have a trivial corresponding special member. 4970 // As a weird special case, a destructor call from a union's constructor 4971 // must be accessible and non-deleted, but need not be trivial. Such a 4972 // destructor is never actually called, but is semantically checked as 4973 // if it were. 4974 DiagKind = 4; 4975 } 4976 4977 if (DiagKind == -1) 4978 return false; 4979 4980 if (Diagnose) { 4981 if (Field) { 4982 S.Diag(Field->getLocation(), 4983 diag::note_deleted_special_member_class_subobject) 4984 << CSM << MD->getParent() << /*IsField*/true 4985 << Field << DiagKind << IsDtorCallInCtor; 4986 } else { 4987 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4988 S.Diag(Base->getLocStart(), 4989 diag::note_deleted_special_member_class_subobject) 4990 << CSM << MD->getParent() << /*IsField*/false 4991 << Base->getType() << DiagKind << IsDtorCallInCtor; 4992 } 4993 4994 if (DiagKind == 1) 4995 S.NoteDeletedFunction(Decl); 4996 // FIXME: Explain inaccessibility if DiagKind == 3. 4997 } 4998 4999 return true; 5000} 5001 5002/// Check whether we should delete a special member function due to having a 5003/// direct or virtual base class or non-static data member of class type M. 5004bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 5005 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 5006 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 5007 5008 // C++11 [class.ctor]p5: 5009 // -- any direct or virtual base class, or non-static data member with no 5010 // brace-or-equal-initializer, has class type M (or array thereof) and 5011 // either M has no default constructor or overload resolution as applied 5012 // to M's default constructor results in an ambiguity or in a function 5013 // that is deleted or inaccessible 5014 // C++11 [class.copy]p11, C++11 [class.copy]p23: 5015 // -- a direct or virtual base class B that cannot be copied/moved because 5016 // overload resolution, as applied to B's corresponding special member, 5017 // results in an ambiguity or a function that is deleted or inaccessible 5018 // from the defaulted special member 5019 // C++11 [class.dtor]p5: 5020 // -- any direct or virtual base class [...] has a type with a destructor 5021 // that is deleted or inaccessible 5022 if (!(CSM == Sema::CXXDefaultConstructor && 5023 Field && Field->hasInClassInitializer()) && 5024 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 5025 return true; 5026 5027 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 5028 // -- any direct or virtual base class or non-static data member has a 5029 // type with a destructor that is deleted or inaccessible 5030 if (IsConstructor) { 5031 Sema::SpecialMemberOverloadResult *SMOR = 5032 S.LookupSpecialMember(Class, Sema::CXXDestructor, 5033 false, false, false, false, false); 5034 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 5035 return true; 5036 } 5037 5038 return false; 5039} 5040 5041/// Check whether we should delete a special member function due to the class 5042/// having a particular direct or virtual base class. 5043bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 5044 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 5045 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 5046} 5047 5048/// Check whether we should delete a special member function due to the class 5049/// having a particular non-static data member. 5050bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 5051 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 5052 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 5053 5054 if (CSM == Sema::CXXDefaultConstructor) { 5055 // For a default constructor, all references must be initialized in-class 5056 // and, if a union, it must have a non-const member. 5057 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 5058 if (Diagnose) 5059 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 5060 << MD->getParent() << FD << FieldType << /*Reference*/0; 5061 return true; 5062 } 5063 // C++11 [class.ctor]p5: any non-variant non-static data member of 5064 // const-qualified type (or array thereof) with no 5065 // brace-or-equal-initializer does not have a user-provided default 5066 // constructor. 5067 if (!inUnion() && FieldType.isConstQualified() && 5068 !FD->hasInClassInitializer() && 5069 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 5070 if (Diagnose) 5071 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 5072 << MD->getParent() << FD << FD->getType() << /*Const*/1; 5073 return true; 5074 } 5075 5076 if (inUnion() && !FieldType.isConstQualified()) 5077 AllFieldsAreConst = false; 5078 } else if (CSM == Sema::CXXCopyConstructor) { 5079 // For a copy constructor, data members must not be of rvalue reference 5080 // type. 5081 if (FieldType->isRValueReferenceType()) { 5082 if (Diagnose) 5083 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 5084 << MD->getParent() << FD << FieldType; 5085 return true; 5086 } 5087 } else if (IsAssignment) { 5088 // For an assignment operator, data members must not be of reference type. 5089 if (FieldType->isReferenceType()) { 5090 if (Diagnose) 5091 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 5092 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 5093 return true; 5094 } 5095 if (!FieldRecord && FieldType.isConstQualified()) { 5096 // C++11 [class.copy]p23: 5097 // -- a non-static data member of const non-class type (or array thereof) 5098 if (Diagnose) 5099 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 5100 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 5101 return true; 5102 } 5103 } 5104 5105 if (FieldRecord) { 5106 // Some additional restrictions exist on the variant members. 5107 if (!inUnion() && FieldRecord->isUnion() && 5108 FieldRecord->isAnonymousStructOrUnion()) { 5109 bool AllVariantFieldsAreConst = true; 5110 5111 // FIXME: Handle anonymous unions declared within anonymous unions. 5112 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 5113 UE = FieldRecord->field_end(); 5114 UI != UE; ++UI) { 5115 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 5116 5117 if (!UnionFieldType.isConstQualified()) 5118 AllVariantFieldsAreConst = false; 5119 5120 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 5121 if (UnionFieldRecord && 5122 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 5123 UnionFieldType.getCVRQualifiers())) 5124 return true; 5125 } 5126 5127 // At least one member in each anonymous union must be non-const 5128 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 5129 FieldRecord->field_begin() != FieldRecord->field_end()) { 5130 if (Diagnose) 5131 S.Diag(FieldRecord->getLocation(), 5132 diag::note_deleted_default_ctor_all_const) 5133 << MD->getParent() << /*anonymous union*/1; 5134 return true; 5135 } 5136 5137 // Don't check the implicit member of the anonymous union type. 5138 // This is technically non-conformant, but sanity demands it. 5139 return false; 5140 } 5141 5142 if (shouldDeleteForClassSubobject(FieldRecord, FD, 5143 FieldType.getCVRQualifiers())) 5144 return true; 5145 } 5146 5147 return false; 5148} 5149 5150/// C++11 [class.ctor] p5: 5151/// A defaulted default constructor for a class X is defined as deleted if 5152/// X is a union and all of its variant members are of const-qualified type. 5153bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 5154 // This is a silly definition, because it gives an empty union a deleted 5155 // default constructor. Don't do that. 5156 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 5157 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 5158 if (Diagnose) 5159 S.Diag(MD->getParent()->getLocation(), 5160 diag::note_deleted_default_ctor_all_const) 5161 << MD->getParent() << /*not anonymous union*/0; 5162 return true; 5163 } 5164 return false; 5165} 5166 5167/// Determine whether a defaulted special member function should be defined as 5168/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 5169/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 5170bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 5171 bool Diagnose) { 5172 if (MD->isInvalidDecl()) 5173 return false; 5174 CXXRecordDecl *RD = MD->getParent(); 5175 assert(!RD->isDependentType() && "do deletion after instantiation"); 5176 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 5177 return false; 5178 5179 // C++11 [expr.lambda.prim]p19: 5180 // The closure type associated with a lambda-expression has a 5181 // deleted (8.4.3) default constructor and a deleted copy 5182 // assignment operator. 5183 if (RD->isLambda() && 5184 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 5185 if (Diagnose) 5186 Diag(RD->getLocation(), diag::note_lambda_decl); 5187 return true; 5188 } 5189 5190 // For an anonymous struct or union, the copy and assignment special members 5191 // will never be used, so skip the check. For an anonymous union declared at 5192 // namespace scope, the constructor and destructor are used. 5193 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 5194 RD->isAnonymousStructOrUnion()) 5195 return false; 5196 5197 // C++11 [class.copy]p7, p18: 5198 // If the class definition declares a move constructor or move assignment 5199 // operator, an implicitly declared copy constructor or copy assignment 5200 // operator is defined as deleted. 5201 if (MD->isImplicit() && 5202 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 5203 CXXMethodDecl *UserDeclaredMove = 0; 5204 5205 // In Microsoft mode, a user-declared move only causes the deletion of the 5206 // corresponding copy operation, not both copy operations. 5207 if (RD->hasUserDeclaredMoveConstructor() && 5208 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 5209 if (!Diagnose) return true; 5210 5211 // Find any user-declared move constructor. 5212 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 5213 E = RD->ctor_end(); I != E; ++I) { 5214 if (I->isMoveConstructor()) { 5215 UserDeclaredMove = *I; 5216 break; 5217 } 5218 } 5219 assert(UserDeclaredMove); 5220 } else if (RD->hasUserDeclaredMoveAssignment() && 5221 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 5222 if (!Diagnose) return true; 5223 5224 // Find any user-declared move assignment operator. 5225 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 5226 E = RD->method_end(); I != E; ++I) { 5227 if (I->isMoveAssignmentOperator()) { 5228 UserDeclaredMove = *I; 5229 break; 5230 } 5231 } 5232 assert(UserDeclaredMove); 5233 } 5234 5235 if (UserDeclaredMove) { 5236 Diag(UserDeclaredMove->getLocation(), 5237 diag::note_deleted_copy_user_declared_move) 5238 << (CSM == CXXCopyAssignment) << RD 5239 << UserDeclaredMove->isMoveAssignmentOperator(); 5240 return true; 5241 } 5242 } 5243 5244 // Do access control from the special member function 5245 ContextRAII MethodContext(*this, MD); 5246 5247 // C++11 [class.dtor]p5: 5248 // -- for a virtual destructor, lookup of the non-array deallocation function 5249 // results in an ambiguity or in a function that is deleted or inaccessible 5250 if (CSM == CXXDestructor && MD->isVirtual()) { 5251 FunctionDecl *OperatorDelete = 0; 5252 DeclarationName Name = 5253 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5254 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5255 OperatorDelete, false)) { 5256 if (Diagnose) 5257 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5258 return true; 5259 } 5260 } 5261 5262 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5263 5264 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5265 BE = RD->bases_end(); BI != BE; ++BI) 5266 if (!BI->isVirtual() && 5267 SMI.shouldDeleteForBase(BI)) 5268 return true; 5269 5270 // Per DR1611, do not consider virtual bases of constructors of abstract 5271 // classes, since we are not going to construct them. 5272 if (!RD->isAbstract() || !SMI.IsConstructor) { 5273 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5274 BE = RD->vbases_end(); 5275 BI != BE; ++BI) 5276 if (SMI.shouldDeleteForBase(BI)) 5277 return true; 5278 } 5279 5280 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5281 FE = RD->field_end(); FI != FE; ++FI) 5282 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5283 SMI.shouldDeleteForField(*FI)) 5284 return true; 5285 5286 if (SMI.shouldDeleteForAllConstMembers()) 5287 return true; 5288 5289 return false; 5290} 5291 5292/// Perform lookup for a special member of the specified kind, and determine 5293/// whether it is trivial. If the triviality can be determined without the 5294/// lookup, skip it. This is intended for use when determining whether a 5295/// special member of a containing object is trivial, and thus does not ever 5296/// perform overload resolution for default constructors. 5297/// 5298/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5299/// member that was most likely to be intended to be trivial, if any. 5300static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5301 Sema::CXXSpecialMember CSM, unsigned Quals, 5302 CXXMethodDecl **Selected) { 5303 if (Selected) 5304 *Selected = 0; 5305 5306 switch (CSM) { 5307 case Sema::CXXInvalid: 5308 llvm_unreachable("not a special member"); 5309 5310 case Sema::CXXDefaultConstructor: 5311 // C++11 [class.ctor]p5: 5312 // A default constructor is trivial if: 5313 // - all the [direct subobjects] have trivial default constructors 5314 // 5315 // Note, no overload resolution is performed in this case. 5316 if (RD->hasTrivialDefaultConstructor()) 5317 return true; 5318 5319 if (Selected) { 5320 // If there's a default constructor which could have been trivial, dig it 5321 // out. Otherwise, if there's any user-provided default constructor, point 5322 // to that as an example of why there's not a trivial one. 5323 CXXConstructorDecl *DefCtor = 0; 5324 if (RD->needsImplicitDefaultConstructor()) 5325 S.DeclareImplicitDefaultConstructor(RD); 5326 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5327 CE = RD->ctor_end(); CI != CE; ++CI) { 5328 if (!CI->isDefaultConstructor()) 5329 continue; 5330 DefCtor = *CI; 5331 if (!DefCtor->isUserProvided()) 5332 break; 5333 } 5334 5335 *Selected = DefCtor; 5336 } 5337 5338 return false; 5339 5340 case Sema::CXXDestructor: 5341 // C++11 [class.dtor]p5: 5342 // A destructor is trivial if: 5343 // - all the direct [subobjects] have trivial destructors 5344 if (RD->hasTrivialDestructor()) 5345 return true; 5346 5347 if (Selected) { 5348 if (RD->needsImplicitDestructor()) 5349 S.DeclareImplicitDestructor(RD); 5350 *Selected = RD->getDestructor(); 5351 } 5352 5353 return false; 5354 5355 case Sema::CXXCopyConstructor: 5356 // C++11 [class.copy]p12: 5357 // A copy constructor is trivial if: 5358 // - the constructor selected to copy each direct [subobject] is trivial 5359 if (RD->hasTrivialCopyConstructor()) { 5360 if (Quals == Qualifiers::Const) 5361 // We must either select the trivial copy constructor or reach an 5362 // ambiguity; no need to actually perform overload resolution. 5363 return true; 5364 } else if (!Selected) { 5365 return false; 5366 } 5367 // In C++98, we are not supposed to perform overload resolution here, but we 5368 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5369 // cases like B as having a non-trivial copy constructor: 5370 // struct A { template<typename T> A(T&); }; 5371 // struct B { mutable A a; }; 5372 goto NeedOverloadResolution; 5373 5374 case Sema::CXXCopyAssignment: 5375 // C++11 [class.copy]p25: 5376 // A copy assignment operator is trivial if: 5377 // - the assignment operator selected to copy each direct [subobject] is 5378 // trivial 5379 if (RD->hasTrivialCopyAssignment()) { 5380 if (Quals == Qualifiers::Const) 5381 return true; 5382 } else if (!Selected) { 5383 return false; 5384 } 5385 // In C++98, we are not supposed to perform overload resolution here, but we 5386 // treat that as a language defect. 5387 goto NeedOverloadResolution; 5388 5389 case Sema::CXXMoveConstructor: 5390 case Sema::CXXMoveAssignment: 5391 NeedOverloadResolution: 5392 Sema::SpecialMemberOverloadResult *SMOR = 5393 S.LookupSpecialMember(RD, CSM, 5394 Quals & Qualifiers::Const, 5395 Quals & Qualifiers::Volatile, 5396 /*RValueThis*/false, /*ConstThis*/false, 5397 /*VolatileThis*/false); 5398 5399 // The standard doesn't describe how to behave if the lookup is ambiguous. 5400 // We treat it as not making the member non-trivial, just like the standard 5401 // mandates for the default constructor. This should rarely matter, because 5402 // the member will also be deleted. 5403 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5404 return true; 5405 5406 if (!SMOR->getMethod()) { 5407 assert(SMOR->getKind() == 5408 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5409 return false; 5410 } 5411 5412 // We deliberately don't check if we found a deleted special member. We're 5413 // not supposed to! 5414 if (Selected) 5415 *Selected = SMOR->getMethod(); 5416 return SMOR->getMethod()->isTrivial(); 5417 } 5418 5419 llvm_unreachable("unknown special method kind"); 5420} 5421 5422static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5423 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5424 CI != CE; ++CI) 5425 if (!CI->isImplicit()) 5426 return *CI; 5427 5428 // Look for constructor templates. 5429 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5430 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5431 if (CXXConstructorDecl *CD = 5432 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5433 return CD; 5434 } 5435 5436 return 0; 5437} 5438 5439/// The kind of subobject we are checking for triviality. The values of this 5440/// enumeration are used in diagnostics. 5441enum TrivialSubobjectKind { 5442 /// The subobject is a base class. 5443 TSK_BaseClass, 5444 /// The subobject is a non-static data member. 5445 TSK_Field, 5446 /// The object is actually the complete object. 5447 TSK_CompleteObject 5448}; 5449 5450/// Check whether the special member selected for a given type would be trivial. 5451static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5452 QualType SubType, 5453 Sema::CXXSpecialMember CSM, 5454 TrivialSubobjectKind Kind, 5455 bool Diagnose) { 5456 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5457 if (!SubRD) 5458 return true; 5459 5460 CXXMethodDecl *Selected; 5461 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5462 Diagnose ? &Selected : 0)) 5463 return true; 5464 5465 if (Diagnose) { 5466 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5467 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5468 << Kind << SubType.getUnqualifiedType(); 5469 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5470 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5471 } else if (!Selected) 5472 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5473 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5474 else if (Selected->isUserProvided()) { 5475 if (Kind == TSK_CompleteObject) 5476 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5477 << Kind << SubType.getUnqualifiedType() << CSM; 5478 else { 5479 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5480 << Kind << SubType.getUnqualifiedType() << CSM; 5481 S.Diag(Selected->getLocation(), diag::note_declared_at); 5482 } 5483 } else { 5484 if (Kind != TSK_CompleteObject) 5485 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5486 << Kind << SubType.getUnqualifiedType() << CSM; 5487 5488 // Explain why the defaulted or deleted special member isn't trivial. 5489 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5490 } 5491 } 5492 5493 return false; 5494} 5495 5496/// Check whether the members of a class type allow a special member to be 5497/// trivial. 5498static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5499 Sema::CXXSpecialMember CSM, 5500 bool ConstArg, bool Diagnose) { 5501 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5502 FE = RD->field_end(); FI != FE; ++FI) { 5503 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5504 continue; 5505 5506 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5507 5508 // Pretend anonymous struct or union members are members of this class. 5509 if (FI->isAnonymousStructOrUnion()) { 5510 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5511 CSM, ConstArg, Diagnose)) 5512 return false; 5513 continue; 5514 } 5515 5516 // C++11 [class.ctor]p5: 5517 // A default constructor is trivial if [...] 5518 // -- no non-static data member of its class has a 5519 // brace-or-equal-initializer 5520 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5521 if (Diagnose) 5522 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5523 return false; 5524 } 5525 5526 // Objective C ARC 4.3.5: 5527 // [...] nontrivally ownership-qualified types are [...] not trivially 5528 // default constructible, copy constructible, move constructible, copy 5529 // assignable, move assignable, or destructible [...] 5530 if (S.getLangOpts().ObjCAutoRefCount && 5531 FieldType.hasNonTrivialObjCLifetime()) { 5532 if (Diagnose) 5533 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5534 << RD << FieldType.getObjCLifetime(); 5535 return false; 5536 } 5537 5538 if (ConstArg && !FI->isMutable()) 5539 FieldType.addConst(); 5540 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5541 TSK_Field, Diagnose)) 5542 return false; 5543 } 5544 5545 return true; 5546} 5547 5548/// Diagnose why the specified class does not have a trivial special member of 5549/// the given kind. 5550void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5551 QualType Ty = Context.getRecordType(RD); 5552 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5553 Ty.addConst(); 5554 5555 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5556 TSK_CompleteObject, /*Diagnose*/true); 5557} 5558 5559/// Determine whether a defaulted or deleted special member function is trivial, 5560/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5561/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5562bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5563 bool Diagnose) { 5564 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5565 5566 CXXRecordDecl *RD = MD->getParent(); 5567 5568 bool ConstArg = false; 5569 5570 // C++11 [class.copy]p12, p25: 5571 // A [special member] is trivial if its declared parameter type is the same 5572 // as if it had been implicitly declared [...] 5573 switch (CSM) { 5574 case CXXDefaultConstructor: 5575 case CXXDestructor: 5576 // Trivial default constructors and destructors cannot have parameters. 5577 break; 5578 5579 case CXXCopyConstructor: 5580 case CXXCopyAssignment: { 5581 // Trivial copy operations always have const, non-volatile parameter types. 5582 ConstArg = true; 5583 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5584 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5585 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5586 if (Diagnose) 5587 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5588 << Param0->getSourceRange() << Param0->getType() 5589 << Context.getLValueReferenceType( 5590 Context.getRecordType(RD).withConst()); 5591 return false; 5592 } 5593 break; 5594 } 5595 5596 case CXXMoveConstructor: 5597 case CXXMoveAssignment: { 5598 // Trivial move operations always have non-cv-qualified parameters. 5599 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5600 const RValueReferenceType *RT = 5601 Param0->getType()->getAs<RValueReferenceType>(); 5602 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5603 if (Diagnose) 5604 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5605 << Param0->getSourceRange() << Param0->getType() 5606 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5607 return false; 5608 } 5609 break; 5610 } 5611 5612 case CXXInvalid: 5613 llvm_unreachable("not a special member"); 5614 } 5615 5616 // FIXME: We require that the parameter-declaration-clause is equivalent to 5617 // that of an implicit declaration, not just that the declared parameter type 5618 // matches, in order to prevent absuridities like a function simultaneously 5619 // being a trivial copy constructor and a non-trivial default constructor. 5620 // This issue has not yet been assigned a core issue number. 5621 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5622 if (Diagnose) 5623 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5624 diag::note_nontrivial_default_arg) 5625 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5626 return false; 5627 } 5628 if (MD->isVariadic()) { 5629 if (Diagnose) 5630 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5631 return false; 5632 } 5633 5634 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5635 // A copy/move [constructor or assignment operator] is trivial if 5636 // -- the [member] selected to copy/move each direct base class subobject 5637 // is trivial 5638 // 5639 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5640 // A [default constructor or destructor] is trivial if 5641 // -- all the direct base classes have trivial [default constructors or 5642 // destructors] 5643 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5644 BE = RD->bases_end(); BI != BE; ++BI) 5645 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5646 ConstArg ? BI->getType().withConst() 5647 : BI->getType(), 5648 CSM, TSK_BaseClass, Diagnose)) 5649 return false; 5650 5651 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5652 // A copy/move [constructor or assignment operator] for a class X is 5653 // trivial if 5654 // -- for each non-static data member of X that is of class type (or array 5655 // thereof), the constructor selected to copy/move that member is 5656 // trivial 5657 // 5658 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5659 // A [default constructor or destructor] is trivial if 5660 // -- for all of the non-static data members of its class that are of class 5661 // type (or array thereof), each such class has a trivial [default 5662 // constructor or destructor] 5663 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5664 return false; 5665 5666 // C++11 [class.dtor]p5: 5667 // A destructor is trivial if [...] 5668 // -- the destructor is not virtual 5669 if (CSM == CXXDestructor && MD->isVirtual()) { 5670 if (Diagnose) 5671 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5672 return false; 5673 } 5674 5675 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5676 // A [special member] for class X is trivial if [...] 5677 // -- class X has no virtual functions and no virtual base classes 5678 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5679 if (!Diagnose) 5680 return false; 5681 5682 if (RD->getNumVBases()) { 5683 // Check for virtual bases. We already know that the corresponding 5684 // member in all bases is trivial, so vbases must all be direct. 5685 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5686 assert(BS.isVirtual()); 5687 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5688 return false; 5689 } 5690 5691 // Must have a virtual method. 5692 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5693 ME = RD->method_end(); MI != ME; ++MI) { 5694 if (MI->isVirtual()) { 5695 SourceLocation MLoc = MI->getLocStart(); 5696 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5697 return false; 5698 } 5699 } 5700 5701 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5702 } 5703 5704 // Looks like it's trivial! 5705 return true; 5706} 5707 5708/// \brief Data used with FindHiddenVirtualMethod 5709namespace { 5710 struct FindHiddenVirtualMethodData { 5711 Sema *S; 5712 CXXMethodDecl *Method; 5713 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5714 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5715 }; 5716} 5717 5718/// \brief Check whether any most overriden method from MD in Methods 5719static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5720 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5721 if (MD->size_overridden_methods() == 0) 5722 return Methods.count(MD->getCanonicalDecl()); 5723 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5724 E = MD->end_overridden_methods(); 5725 I != E; ++I) 5726 if (CheckMostOverridenMethods(*I, Methods)) 5727 return true; 5728 return false; 5729} 5730 5731/// \brief Member lookup function that determines whether a given C++ 5732/// method overloads virtual methods in a base class without overriding any, 5733/// to be used with CXXRecordDecl::lookupInBases(). 5734static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5735 CXXBasePath &Path, 5736 void *UserData) { 5737 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5738 5739 FindHiddenVirtualMethodData &Data 5740 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5741 5742 DeclarationName Name = Data.Method->getDeclName(); 5743 assert(Name.getNameKind() == DeclarationName::Identifier); 5744 5745 bool foundSameNameMethod = false; 5746 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5747 for (Path.Decls = BaseRecord->lookup(Name); 5748 !Path.Decls.empty(); 5749 Path.Decls = Path.Decls.slice(1)) { 5750 NamedDecl *D = Path.Decls.front(); 5751 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5752 MD = MD->getCanonicalDecl(); 5753 foundSameNameMethod = true; 5754 // Interested only in hidden virtual methods. 5755 if (!MD->isVirtual()) 5756 continue; 5757 // If the method we are checking overrides a method from its base 5758 // don't warn about the other overloaded methods. 5759 if (!Data.S->IsOverload(Data.Method, MD, false)) 5760 return true; 5761 // Collect the overload only if its hidden. 5762 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5763 overloadedMethods.push_back(MD); 5764 } 5765 } 5766 5767 if (foundSameNameMethod) 5768 Data.OverloadedMethods.append(overloadedMethods.begin(), 5769 overloadedMethods.end()); 5770 return foundSameNameMethod; 5771} 5772 5773/// \brief Add the most overriden methods from MD to Methods 5774static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5775 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5776 if (MD->size_overridden_methods() == 0) 5777 Methods.insert(MD->getCanonicalDecl()); 5778 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5779 E = MD->end_overridden_methods(); 5780 I != E; ++I) 5781 AddMostOverridenMethods(*I, Methods); 5782} 5783 5784/// \brief Check if a method overloads virtual methods in a base class without 5785/// overriding any. 5786void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, 5787 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5788 if (!MD->getDeclName().isIdentifier()) 5789 return; 5790 5791 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5792 /*bool RecordPaths=*/false, 5793 /*bool DetectVirtual=*/false); 5794 FindHiddenVirtualMethodData Data; 5795 Data.Method = MD; 5796 Data.S = this; 5797 5798 // Keep the base methods that were overriden or introduced in the subclass 5799 // by 'using' in a set. A base method not in this set is hidden. 5800 CXXRecordDecl *DC = MD->getParent(); 5801 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5802 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5803 NamedDecl *ND = *I; 5804 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5805 ND = shad->getTargetDecl(); 5806 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5807 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5808 } 5809 5810 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths)) 5811 OverloadedMethods = Data.OverloadedMethods; 5812} 5813 5814void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, 5815 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5816 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { 5817 CXXMethodDecl *overloadedMD = OverloadedMethods[i]; 5818 PartialDiagnostic PD = PDiag( 5819 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5820 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5821 Diag(overloadedMD->getLocation(), PD); 5822 } 5823} 5824 5825/// \brief Diagnose methods which overload virtual methods in a base class 5826/// without overriding any. 5827void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { 5828 if (MD->isInvalidDecl()) 5829 return; 5830 5831 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5832 MD->getLocation()) == DiagnosticsEngine::Ignored) 5833 return; 5834 5835 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5836 FindHiddenVirtualMethods(MD, OverloadedMethods); 5837 if (!OverloadedMethods.empty()) { 5838 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5839 << MD << (OverloadedMethods.size() > 1); 5840 5841 NoteHiddenVirtualMethods(MD, OverloadedMethods); 5842 } 5843} 5844 5845void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5846 Decl *TagDecl, 5847 SourceLocation LBrac, 5848 SourceLocation RBrac, 5849 AttributeList *AttrList) { 5850 if (!TagDecl) 5851 return; 5852 5853 AdjustDeclIfTemplate(TagDecl); 5854 5855 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5856 if (l->getKind() != AttributeList::AT_Visibility) 5857 continue; 5858 l->setInvalid(); 5859 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5860 l->getName(); 5861 } 5862 5863 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5864 // strict aliasing violation! 5865 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5866 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5867 5868 CheckCompletedCXXClass( 5869 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5870} 5871 5872/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5873/// special functions, such as the default constructor, copy 5874/// constructor, or destructor, to the given C++ class (C++ 5875/// [special]p1). This routine can only be executed just before the 5876/// definition of the class is complete. 5877void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5878 if (!ClassDecl->hasUserDeclaredConstructor()) 5879 ++ASTContext::NumImplicitDefaultConstructors; 5880 5881 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5882 ++ASTContext::NumImplicitCopyConstructors; 5883 5884 // If the properties or semantics of the copy constructor couldn't be 5885 // determined while the class was being declared, force a declaration 5886 // of it now. 5887 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5888 DeclareImplicitCopyConstructor(ClassDecl); 5889 } 5890 5891 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5892 ++ASTContext::NumImplicitMoveConstructors; 5893 5894 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5895 DeclareImplicitMoveConstructor(ClassDecl); 5896 } 5897 5898 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5899 ++ASTContext::NumImplicitCopyAssignmentOperators; 5900 5901 // If we have a dynamic class, then the copy assignment operator may be 5902 // virtual, so we have to declare it immediately. This ensures that, e.g., 5903 // it shows up in the right place in the vtable and that we diagnose 5904 // problems with the implicit exception specification. 5905 if (ClassDecl->isDynamicClass() || 5906 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5907 DeclareImplicitCopyAssignment(ClassDecl); 5908 } 5909 5910 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5911 ++ASTContext::NumImplicitMoveAssignmentOperators; 5912 5913 // Likewise for the move assignment operator. 5914 if (ClassDecl->isDynamicClass() || 5915 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5916 DeclareImplicitMoveAssignment(ClassDecl); 5917 } 5918 5919 if (!ClassDecl->hasUserDeclaredDestructor()) { 5920 ++ASTContext::NumImplicitDestructors; 5921 5922 // If we have a dynamic class, then the destructor may be virtual, so we 5923 // have to declare the destructor immediately. This ensures that, e.g., it 5924 // shows up in the right place in the vtable and that we diagnose problems 5925 // with the implicit exception specification. 5926 if (ClassDecl->isDynamicClass() || 5927 ClassDecl->needsOverloadResolutionForDestructor()) 5928 DeclareImplicitDestructor(ClassDecl); 5929 } 5930} 5931 5932void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5933 if (!D) 5934 return; 5935 5936 int NumParamList = D->getNumTemplateParameterLists(); 5937 for (int i = 0; i < NumParamList; i++) { 5938 TemplateParameterList* Params = D->getTemplateParameterList(i); 5939 for (TemplateParameterList::iterator Param = Params->begin(), 5940 ParamEnd = Params->end(); 5941 Param != ParamEnd; ++Param) { 5942 NamedDecl *Named = cast<NamedDecl>(*Param); 5943 if (Named->getDeclName()) { 5944 S->AddDecl(Named); 5945 IdResolver.AddDecl(Named); 5946 } 5947 } 5948 } 5949} 5950 5951void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5952 if (!D) 5953 return; 5954 5955 TemplateParameterList *Params = 0; 5956 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5957 Params = Template->getTemplateParameters(); 5958 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5959 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5960 Params = PartialSpec->getTemplateParameters(); 5961 else 5962 return; 5963 5964 for (TemplateParameterList::iterator Param = Params->begin(), 5965 ParamEnd = Params->end(); 5966 Param != ParamEnd; ++Param) { 5967 NamedDecl *Named = cast<NamedDecl>(*Param); 5968 if (Named->getDeclName()) { 5969 S->AddDecl(Named); 5970 IdResolver.AddDecl(Named); 5971 } 5972 } 5973} 5974 5975void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5976 if (!RecordD) return; 5977 AdjustDeclIfTemplate(RecordD); 5978 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5979 PushDeclContext(S, Record); 5980} 5981 5982void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5983 if (!RecordD) return; 5984 PopDeclContext(); 5985} 5986 5987/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5988/// parsing a top-level (non-nested) C++ class, and we are now 5989/// parsing those parts of the given Method declaration that could 5990/// not be parsed earlier (C++ [class.mem]p2), such as default 5991/// arguments. This action should enter the scope of the given 5992/// Method declaration as if we had just parsed the qualified method 5993/// name. However, it should not bring the parameters into scope; 5994/// that will be performed by ActOnDelayedCXXMethodParameter. 5995void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5996} 5997 5998/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5999/// C++ method declaration. We're (re-)introducing the given 6000/// function parameter into scope for use in parsing later parts of 6001/// the method declaration. For example, we could see an 6002/// ActOnParamDefaultArgument event for this parameter. 6003void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 6004 if (!ParamD) 6005 return; 6006 6007 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 6008 6009 // If this parameter has an unparsed default argument, clear it out 6010 // to make way for the parsed default argument. 6011 if (Param->hasUnparsedDefaultArg()) 6012 Param->setDefaultArg(0); 6013 6014 S->AddDecl(Param); 6015 if (Param->getDeclName()) 6016 IdResolver.AddDecl(Param); 6017} 6018 6019/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 6020/// processing the delayed method declaration for Method. The method 6021/// declaration is now considered finished. There may be a separate 6022/// ActOnStartOfFunctionDef action later (not necessarily 6023/// immediately!) for this method, if it was also defined inside the 6024/// class body. 6025void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 6026 if (!MethodD) 6027 return; 6028 6029 AdjustDeclIfTemplate(MethodD); 6030 6031 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 6032 6033 // Now that we have our default arguments, check the constructor 6034 // again. It could produce additional diagnostics or affect whether 6035 // the class has implicitly-declared destructors, among other 6036 // things. 6037 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 6038 CheckConstructor(Constructor); 6039 6040 // Check the default arguments, which we may have added. 6041 if (!Method->isInvalidDecl()) 6042 CheckCXXDefaultArguments(Method); 6043} 6044 6045/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 6046/// the well-formedness of the constructor declarator @p D with type @p 6047/// R. If there are any errors in the declarator, this routine will 6048/// emit diagnostics and set the invalid bit to true. In any case, the type 6049/// will be updated to reflect a well-formed type for the constructor and 6050/// returned. 6051QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 6052 StorageClass &SC) { 6053 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 6054 6055 // C++ [class.ctor]p3: 6056 // A constructor shall not be virtual (10.3) or static (9.4). A 6057 // constructor can be invoked for a const, volatile or const 6058 // volatile object. A constructor shall not be declared const, 6059 // volatile, or const volatile (9.3.2). 6060 if (isVirtual) { 6061 if (!D.isInvalidType()) 6062 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 6063 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 6064 << SourceRange(D.getIdentifierLoc()); 6065 D.setInvalidType(); 6066 } 6067 if (SC == SC_Static) { 6068 if (!D.isInvalidType()) 6069 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 6070 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6071 << SourceRange(D.getIdentifierLoc()); 6072 D.setInvalidType(); 6073 SC = SC_None; 6074 } 6075 6076 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6077 if (FTI.TypeQuals != 0) { 6078 if (FTI.TypeQuals & Qualifiers::Const) 6079 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6080 << "const" << SourceRange(D.getIdentifierLoc()); 6081 if (FTI.TypeQuals & Qualifiers::Volatile) 6082 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6083 << "volatile" << SourceRange(D.getIdentifierLoc()); 6084 if (FTI.TypeQuals & Qualifiers::Restrict) 6085 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6086 << "restrict" << SourceRange(D.getIdentifierLoc()); 6087 D.setInvalidType(); 6088 } 6089 6090 // C++0x [class.ctor]p4: 6091 // A constructor shall not be declared with a ref-qualifier. 6092 if (FTI.hasRefQualifier()) { 6093 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 6094 << FTI.RefQualifierIsLValueRef 6095 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6096 D.setInvalidType(); 6097 } 6098 6099 // Rebuild the function type "R" without any type qualifiers (in 6100 // case any of the errors above fired) and with "void" as the 6101 // return type, since constructors don't have return types. 6102 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6103 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 6104 return R; 6105 6106 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6107 EPI.TypeQuals = 0; 6108 EPI.RefQualifier = RQ_None; 6109 6110 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 6111} 6112 6113/// CheckConstructor - Checks a fully-formed constructor for 6114/// well-formedness, issuing any diagnostics required. Returns true if 6115/// the constructor declarator is invalid. 6116void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 6117 CXXRecordDecl *ClassDecl 6118 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 6119 if (!ClassDecl) 6120 return Constructor->setInvalidDecl(); 6121 6122 // C++ [class.copy]p3: 6123 // A declaration of a constructor for a class X is ill-formed if 6124 // its first parameter is of type (optionally cv-qualified) X and 6125 // either there are no other parameters or else all other 6126 // parameters have default arguments. 6127 if (!Constructor->isInvalidDecl() && 6128 ((Constructor->getNumParams() == 1) || 6129 (Constructor->getNumParams() > 1 && 6130 Constructor->getParamDecl(1)->hasDefaultArg())) && 6131 Constructor->getTemplateSpecializationKind() 6132 != TSK_ImplicitInstantiation) { 6133 QualType ParamType = Constructor->getParamDecl(0)->getType(); 6134 QualType ClassTy = Context.getTagDeclType(ClassDecl); 6135 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 6136 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 6137 const char *ConstRef 6138 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 6139 : " const &"; 6140 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 6141 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 6142 6143 // FIXME: Rather that making the constructor invalid, we should endeavor 6144 // to fix the type. 6145 Constructor->setInvalidDecl(); 6146 } 6147 } 6148} 6149 6150/// CheckDestructor - Checks a fully-formed destructor definition for 6151/// well-formedness, issuing any diagnostics required. Returns true 6152/// on error. 6153bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 6154 CXXRecordDecl *RD = Destructor->getParent(); 6155 6156 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 6157 SourceLocation Loc; 6158 6159 if (!Destructor->isImplicit()) 6160 Loc = Destructor->getLocation(); 6161 else 6162 Loc = RD->getLocation(); 6163 6164 // If we have a virtual destructor, look up the deallocation function 6165 FunctionDecl *OperatorDelete = 0; 6166 DeclarationName Name = 6167 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 6168 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 6169 return true; 6170 6171 MarkFunctionReferenced(Loc, OperatorDelete); 6172 6173 Destructor->setOperatorDelete(OperatorDelete); 6174 } 6175 6176 return false; 6177} 6178 6179static inline bool 6180FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 6181 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 6182 FTI.ArgInfo[0].Param && 6183 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 6184} 6185 6186/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 6187/// the well-formednes of the destructor declarator @p D with type @p 6188/// R. If there are any errors in the declarator, this routine will 6189/// emit diagnostics and set the declarator to invalid. Even if this happens, 6190/// will be updated to reflect a well-formed type for the destructor and 6191/// returned. 6192QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 6193 StorageClass& SC) { 6194 // C++ [class.dtor]p1: 6195 // [...] A typedef-name that names a class is a class-name 6196 // (7.1.3); however, a typedef-name that names a class shall not 6197 // be used as the identifier in the declarator for a destructor 6198 // declaration. 6199 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 6200 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 6201 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6202 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 6203 else if (const TemplateSpecializationType *TST = 6204 DeclaratorType->getAs<TemplateSpecializationType>()) 6205 if (TST->isTypeAlias()) 6206 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6207 << DeclaratorType << 1; 6208 6209 // C++ [class.dtor]p2: 6210 // A destructor is used to destroy objects of its class type. A 6211 // destructor takes no parameters, and no return type can be 6212 // specified for it (not even void). The address of a destructor 6213 // shall not be taken. A destructor shall not be static. A 6214 // destructor can be invoked for a const, volatile or const 6215 // volatile object. A destructor shall not be declared const, 6216 // volatile or const volatile (9.3.2). 6217 if (SC == SC_Static) { 6218 if (!D.isInvalidType()) 6219 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 6220 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6221 << SourceRange(D.getIdentifierLoc()) 6222 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 6223 6224 SC = SC_None; 6225 } 6226 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6227 // Destructors don't have return types, but the parser will 6228 // happily parse something like: 6229 // 6230 // class X { 6231 // float ~X(); 6232 // }; 6233 // 6234 // The return type will be eliminated later. 6235 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 6236 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6237 << SourceRange(D.getIdentifierLoc()); 6238 } 6239 6240 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6241 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 6242 if (FTI.TypeQuals & Qualifiers::Const) 6243 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6244 << "const" << SourceRange(D.getIdentifierLoc()); 6245 if (FTI.TypeQuals & Qualifiers::Volatile) 6246 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6247 << "volatile" << SourceRange(D.getIdentifierLoc()); 6248 if (FTI.TypeQuals & Qualifiers::Restrict) 6249 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6250 << "restrict" << SourceRange(D.getIdentifierLoc()); 6251 D.setInvalidType(); 6252 } 6253 6254 // C++0x [class.dtor]p2: 6255 // A destructor shall not be declared with a ref-qualifier. 6256 if (FTI.hasRefQualifier()) { 6257 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6258 << FTI.RefQualifierIsLValueRef 6259 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6260 D.setInvalidType(); 6261 } 6262 6263 // Make sure we don't have any parameters. 6264 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6265 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6266 6267 // Delete the parameters. 6268 FTI.freeArgs(); 6269 D.setInvalidType(); 6270 } 6271 6272 // Make sure the destructor isn't variadic. 6273 if (FTI.isVariadic) { 6274 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6275 D.setInvalidType(); 6276 } 6277 6278 // Rebuild the function type "R" without any type qualifiers or 6279 // parameters (in case any of the errors above fired) and with 6280 // "void" as the return type, since destructors don't have return 6281 // types. 6282 if (!D.isInvalidType()) 6283 return R; 6284 6285 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6286 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6287 EPI.Variadic = false; 6288 EPI.TypeQuals = 0; 6289 EPI.RefQualifier = RQ_None; 6290 return Context.getFunctionType(Context.VoidTy, None, EPI); 6291} 6292 6293/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6294/// well-formednes of the conversion function declarator @p D with 6295/// type @p R. If there are any errors in the declarator, this routine 6296/// will emit diagnostics and return true. Otherwise, it will return 6297/// false. Either way, the type @p R will be updated to reflect a 6298/// well-formed type for the conversion operator. 6299void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6300 StorageClass& SC) { 6301 // C++ [class.conv.fct]p1: 6302 // Neither parameter types nor return type can be specified. The 6303 // type of a conversion function (8.3.5) is "function taking no 6304 // parameter returning conversion-type-id." 6305 if (SC == SC_Static) { 6306 if (!D.isInvalidType()) 6307 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6308 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6309 << D.getName().getSourceRange(); 6310 D.setInvalidType(); 6311 SC = SC_None; 6312 } 6313 6314 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6315 6316 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6317 // Conversion functions don't have return types, but the parser will 6318 // happily parse something like: 6319 // 6320 // class X { 6321 // float operator bool(); 6322 // }; 6323 // 6324 // The return type will be changed later anyway. 6325 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6326 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6327 << SourceRange(D.getIdentifierLoc()); 6328 D.setInvalidType(); 6329 } 6330 6331 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6332 6333 // Make sure we don't have any parameters. 6334 if (Proto->getNumArgs() > 0) { 6335 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6336 6337 // Delete the parameters. 6338 D.getFunctionTypeInfo().freeArgs(); 6339 D.setInvalidType(); 6340 } else if (Proto->isVariadic()) { 6341 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6342 D.setInvalidType(); 6343 } 6344 6345 // Diagnose "&operator bool()" and other such nonsense. This 6346 // is actually a gcc extension which we don't support. 6347 if (Proto->getResultType() != ConvType) { 6348 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6349 << Proto->getResultType(); 6350 D.setInvalidType(); 6351 ConvType = Proto->getResultType(); 6352 } 6353 6354 // C++ [class.conv.fct]p4: 6355 // The conversion-type-id shall not represent a function type nor 6356 // an array type. 6357 if (ConvType->isArrayType()) { 6358 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6359 ConvType = Context.getPointerType(ConvType); 6360 D.setInvalidType(); 6361 } else if (ConvType->isFunctionType()) { 6362 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6363 ConvType = Context.getPointerType(ConvType); 6364 D.setInvalidType(); 6365 } 6366 6367 // Rebuild the function type "R" without any parameters (in case any 6368 // of the errors above fired) and with the conversion type as the 6369 // return type. 6370 if (D.isInvalidType()) 6371 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6372 6373 // C++0x explicit conversion operators. 6374 if (D.getDeclSpec().isExplicitSpecified()) 6375 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6376 getLangOpts().CPlusPlus11 ? 6377 diag::warn_cxx98_compat_explicit_conversion_functions : 6378 diag::ext_explicit_conversion_functions) 6379 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6380} 6381 6382/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6383/// the declaration of the given C++ conversion function. This routine 6384/// is responsible for recording the conversion function in the C++ 6385/// class, if possible. 6386Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6387 assert(Conversion && "Expected to receive a conversion function declaration"); 6388 6389 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6390 6391 // Make sure we aren't redeclaring the conversion function. 6392 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6393 6394 // C++ [class.conv.fct]p1: 6395 // [...] A conversion function is never used to convert a 6396 // (possibly cv-qualified) object to the (possibly cv-qualified) 6397 // same object type (or a reference to it), to a (possibly 6398 // cv-qualified) base class of that type (or a reference to it), 6399 // or to (possibly cv-qualified) void. 6400 // FIXME: Suppress this warning if the conversion function ends up being a 6401 // virtual function that overrides a virtual function in a base class. 6402 QualType ClassType 6403 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6404 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6405 ConvType = ConvTypeRef->getPointeeType(); 6406 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6407 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6408 /* Suppress diagnostics for instantiations. */; 6409 else if (ConvType->isRecordType()) { 6410 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6411 if (ConvType == ClassType) 6412 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6413 << ClassType; 6414 else if (IsDerivedFrom(ClassType, ConvType)) 6415 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6416 << ClassType << ConvType; 6417 } else if (ConvType->isVoidType()) { 6418 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6419 << ClassType << ConvType; 6420 } 6421 6422 if (FunctionTemplateDecl *ConversionTemplate 6423 = Conversion->getDescribedFunctionTemplate()) 6424 return ConversionTemplate; 6425 6426 return Conversion; 6427} 6428 6429//===----------------------------------------------------------------------===// 6430// Namespace Handling 6431//===----------------------------------------------------------------------===// 6432 6433/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6434/// reopened. 6435static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6436 SourceLocation Loc, 6437 IdentifierInfo *II, bool *IsInline, 6438 NamespaceDecl *PrevNS) { 6439 assert(*IsInline != PrevNS->isInline()); 6440 6441 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6442 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6443 // inline namespaces, with the intention of bringing names into namespace std. 6444 // 6445 // We support this just well enough to get that case working; this is not 6446 // sufficient to support reopening namespaces as inline in general. 6447 if (*IsInline && II && II->getName().startswith("__atomic") && 6448 S.getSourceManager().isInSystemHeader(Loc)) { 6449 // Mark all prior declarations of the namespace as inline. 6450 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6451 NS = NS->getPreviousDecl()) 6452 NS->setInline(*IsInline); 6453 // Patch up the lookup table for the containing namespace. This isn't really 6454 // correct, but it's good enough for this particular case. 6455 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6456 E = PrevNS->decls_end(); I != E; ++I) 6457 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6458 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6459 return; 6460 } 6461 6462 if (PrevNS->isInline()) 6463 // The user probably just forgot the 'inline', so suggest that it 6464 // be added back. 6465 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6466 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6467 else 6468 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6469 << IsInline; 6470 6471 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6472 *IsInline = PrevNS->isInline(); 6473} 6474 6475/// ActOnStartNamespaceDef - This is called at the start of a namespace 6476/// definition. 6477Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6478 SourceLocation InlineLoc, 6479 SourceLocation NamespaceLoc, 6480 SourceLocation IdentLoc, 6481 IdentifierInfo *II, 6482 SourceLocation LBrace, 6483 AttributeList *AttrList) { 6484 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6485 // For anonymous namespace, take the location of the left brace. 6486 SourceLocation Loc = II ? IdentLoc : LBrace; 6487 bool IsInline = InlineLoc.isValid(); 6488 bool IsInvalid = false; 6489 bool IsStd = false; 6490 bool AddToKnown = false; 6491 Scope *DeclRegionScope = NamespcScope->getParent(); 6492 6493 NamespaceDecl *PrevNS = 0; 6494 if (II) { 6495 // C++ [namespace.def]p2: 6496 // The identifier in an original-namespace-definition shall not 6497 // have been previously defined in the declarative region in 6498 // which the original-namespace-definition appears. The 6499 // identifier in an original-namespace-definition is the name of 6500 // the namespace. Subsequently in that declarative region, it is 6501 // treated as an original-namespace-name. 6502 // 6503 // Since namespace names are unique in their scope, and we don't 6504 // look through using directives, just look for any ordinary names. 6505 6506 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6507 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6508 Decl::IDNS_Namespace; 6509 NamedDecl *PrevDecl = 0; 6510 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6511 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6512 ++I) { 6513 if ((*I)->getIdentifierNamespace() & IDNS) { 6514 PrevDecl = *I; 6515 break; 6516 } 6517 } 6518 6519 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6520 6521 if (PrevNS) { 6522 // This is an extended namespace definition. 6523 if (IsInline != PrevNS->isInline()) 6524 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6525 &IsInline, PrevNS); 6526 } else if (PrevDecl) { 6527 // This is an invalid name redefinition. 6528 Diag(Loc, diag::err_redefinition_different_kind) 6529 << II; 6530 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6531 IsInvalid = true; 6532 // Continue on to push Namespc as current DeclContext and return it. 6533 } else if (II->isStr("std") && 6534 CurContext->getRedeclContext()->isTranslationUnit()) { 6535 // This is the first "real" definition of the namespace "std", so update 6536 // our cache of the "std" namespace to point at this definition. 6537 PrevNS = getStdNamespace(); 6538 IsStd = true; 6539 AddToKnown = !IsInline; 6540 } else { 6541 // We've seen this namespace for the first time. 6542 AddToKnown = !IsInline; 6543 } 6544 } else { 6545 // Anonymous namespaces. 6546 6547 // Determine whether the parent already has an anonymous namespace. 6548 DeclContext *Parent = CurContext->getRedeclContext(); 6549 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6550 PrevNS = TU->getAnonymousNamespace(); 6551 } else { 6552 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6553 PrevNS = ND->getAnonymousNamespace(); 6554 } 6555 6556 if (PrevNS && IsInline != PrevNS->isInline()) 6557 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6558 &IsInline, PrevNS); 6559 } 6560 6561 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6562 StartLoc, Loc, II, PrevNS); 6563 if (IsInvalid) 6564 Namespc->setInvalidDecl(); 6565 6566 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6567 6568 // FIXME: Should we be merging attributes? 6569 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6570 PushNamespaceVisibilityAttr(Attr, Loc); 6571 6572 if (IsStd) 6573 StdNamespace = Namespc; 6574 if (AddToKnown) 6575 KnownNamespaces[Namespc] = false; 6576 6577 if (II) { 6578 PushOnScopeChains(Namespc, DeclRegionScope); 6579 } else { 6580 // Link the anonymous namespace into its parent. 6581 DeclContext *Parent = CurContext->getRedeclContext(); 6582 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6583 TU->setAnonymousNamespace(Namespc); 6584 } else { 6585 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6586 } 6587 6588 CurContext->addDecl(Namespc); 6589 6590 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6591 // behaves as if it were replaced by 6592 // namespace unique { /* empty body */ } 6593 // using namespace unique; 6594 // namespace unique { namespace-body } 6595 // where all occurrences of 'unique' in a translation unit are 6596 // replaced by the same identifier and this identifier differs 6597 // from all other identifiers in the entire program. 6598 6599 // We just create the namespace with an empty name and then add an 6600 // implicit using declaration, just like the standard suggests. 6601 // 6602 // CodeGen enforces the "universally unique" aspect by giving all 6603 // declarations semantically contained within an anonymous 6604 // namespace internal linkage. 6605 6606 if (!PrevNS) { 6607 UsingDirectiveDecl* UD 6608 = UsingDirectiveDecl::Create(Context, Parent, 6609 /* 'using' */ LBrace, 6610 /* 'namespace' */ SourceLocation(), 6611 /* qualifier */ NestedNameSpecifierLoc(), 6612 /* identifier */ SourceLocation(), 6613 Namespc, 6614 /* Ancestor */ Parent); 6615 UD->setImplicit(); 6616 Parent->addDecl(UD); 6617 } 6618 } 6619 6620 ActOnDocumentableDecl(Namespc); 6621 6622 // Although we could have an invalid decl (i.e. the namespace name is a 6623 // redefinition), push it as current DeclContext and try to continue parsing. 6624 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6625 // for the namespace has the declarations that showed up in that particular 6626 // namespace definition. 6627 PushDeclContext(NamespcScope, Namespc); 6628 return Namespc; 6629} 6630 6631/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6632/// is a namespace alias, returns the namespace it points to. 6633static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6634 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6635 return AD->getNamespace(); 6636 return dyn_cast_or_null<NamespaceDecl>(D); 6637} 6638 6639/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6640/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6641void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6642 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6643 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6644 Namespc->setRBraceLoc(RBrace); 6645 PopDeclContext(); 6646 if (Namespc->hasAttr<VisibilityAttr>()) 6647 PopPragmaVisibility(true, RBrace); 6648} 6649 6650CXXRecordDecl *Sema::getStdBadAlloc() const { 6651 return cast_or_null<CXXRecordDecl>( 6652 StdBadAlloc.get(Context.getExternalSource())); 6653} 6654 6655NamespaceDecl *Sema::getStdNamespace() const { 6656 return cast_or_null<NamespaceDecl>( 6657 StdNamespace.get(Context.getExternalSource())); 6658} 6659 6660/// \brief Retrieve the special "std" namespace, which may require us to 6661/// implicitly define the namespace. 6662NamespaceDecl *Sema::getOrCreateStdNamespace() { 6663 if (!StdNamespace) { 6664 // The "std" namespace has not yet been defined, so build one implicitly. 6665 StdNamespace = NamespaceDecl::Create(Context, 6666 Context.getTranslationUnitDecl(), 6667 /*Inline=*/false, 6668 SourceLocation(), SourceLocation(), 6669 &PP.getIdentifierTable().get("std"), 6670 /*PrevDecl=*/0); 6671 getStdNamespace()->setImplicit(true); 6672 } 6673 6674 return getStdNamespace(); 6675} 6676 6677bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6678 assert(getLangOpts().CPlusPlus && 6679 "Looking for std::initializer_list outside of C++."); 6680 6681 // We're looking for implicit instantiations of 6682 // template <typename E> class std::initializer_list. 6683 6684 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6685 return false; 6686 6687 ClassTemplateDecl *Template = 0; 6688 const TemplateArgument *Arguments = 0; 6689 6690 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6691 6692 ClassTemplateSpecializationDecl *Specialization = 6693 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6694 if (!Specialization) 6695 return false; 6696 6697 Template = Specialization->getSpecializedTemplate(); 6698 Arguments = Specialization->getTemplateArgs().data(); 6699 } else if (const TemplateSpecializationType *TST = 6700 Ty->getAs<TemplateSpecializationType>()) { 6701 Template = dyn_cast_or_null<ClassTemplateDecl>( 6702 TST->getTemplateName().getAsTemplateDecl()); 6703 Arguments = TST->getArgs(); 6704 } 6705 if (!Template) 6706 return false; 6707 6708 if (!StdInitializerList) { 6709 // Haven't recognized std::initializer_list yet, maybe this is it. 6710 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6711 if (TemplateClass->getIdentifier() != 6712 &PP.getIdentifierTable().get("initializer_list") || 6713 !getStdNamespace()->InEnclosingNamespaceSetOf( 6714 TemplateClass->getDeclContext())) 6715 return false; 6716 // This is a template called std::initializer_list, but is it the right 6717 // template? 6718 TemplateParameterList *Params = Template->getTemplateParameters(); 6719 if (Params->getMinRequiredArguments() != 1) 6720 return false; 6721 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6722 return false; 6723 6724 // It's the right template. 6725 StdInitializerList = Template; 6726 } 6727 6728 if (Template != StdInitializerList) 6729 return false; 6730 6731 // This is an instance of std::initializer_list. Find the argument type. 6732 if (Element) 6733 *Element = Arguments[0].getAsType(); 6734 return true; 6735} 6736 6737static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6738 NamespaceDecl *Std = S.getStdNamespace(); 6739 if (!Std) { 6740 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6741 return 0; 6742 } 6743 6744 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6745 Loc, Sema::LookupOrdinaryName); 6746 if (!S.LookupQualifiedName(Result, Std)) { 6747 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6748 return 0; 6749 } 6750 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6751 if (!Template) { 6752 Result.suppressDiagnostics(); 6753 // We found something weird. Complain about the first thing we found. 6754 NamedDecl *Found = *Result.begin(); 6755 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6756 return 0; 6757 } 6758 6759 // We found some template called std::initializer_list. Now verify that it's 6760 // correct. 6761 TemplateParameterList *Params = Template->getTemplateParameters(); 6762 if (Params->getMinRequiredArguments() != 1 || 6763 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6764 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6765 return 0; 6766 } 6767 6768 return Template; 6769} 6770 6771QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6772 if (!StdInitializerList) { 6773 StdInitializerList = LookupStdInitializerList(*this, Loc); 6774 if (!StdInitializerList) 6775 return QualType(); 6776 } 6777 6778 TemplateArgumentListInfo Args(Loc, Loc); 6779 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6780 Context.getTrivialTypeSourceInfo(Element, 6781 Loc))); 6782 return Context.getCanonicalType( 6783 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6784} 6785 6786bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6787 // C++ [dcl.init.list]p2: 6788 // A constructor is an initializer-list constructor if its first parameter 6789 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6790 // std::initializer_list<E> for some type E, and either there are no other 6791 // parameters or else all other parameters have default arguments. 6792 if (Ctor->getNumParams() < 1 || 6793 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6794 return false; 6795 6796 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6797 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6798 ArgType = RT->getPointeeType().getUnqualifiedType(); 6799 6800 return isStdInitializerList(ArgType, 0); 6801} 6802 6803/// \brief Determine whether a using statement is in a context where it will be 6804/// apply in all contexts. 6805static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6806 switch (CurContext->getDeclKind()) { 6807 case Decl::TranslationUnit: 6808 return true; 6809 case Decl::LinkageSpec: 6810 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6811 default: 6812 return false; 6813 } 6814} 6815 6816namespace { 6817 6818// Callback to only accept typo corrections that are namespaces. 6819class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6820public: 6821 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 6822 if (NamedDecl *ND = candidate.getCorrectionDecl()) 6823 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6824 return false; 6825 } 6826}; 6827 6828} 6829 6830static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6831 CXXScopeSpec &SS, 6832 SourceLocation IdentLoc, 6833 IdentifierInfo *Ident) { 6834 NamespaceValidatorCCC Validator; 6835 R.clear(); 6836 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6837 R.getLookupKind(), Sc, &SS, 6838 Validator)) { 6839 if (DeclContext *DC = S.computeDeclContext(SS, false)) { 6840 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6841 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && 6842 Ident->getName().equals(CorrectedStr); 6843 S.diagnoseTypo(Corrected, 6844 S.PDiag(diag::err_using_directive_member_suggest) 6845 << Ident << DC << DroppedSpecifier << SS.getRange(), 6846 S.PDiag(diag::note_namespace_defined_here)); 6847 } else { 6848 S.diagnoseTypo(Corrected, 6849 S.PDiag(diag::err_using_directive_suggest) << Ident, 6850 S.PDiag(diag::note_namespace_defined_here)); 6851 } 6852 R.addDecl(Corrected.getCorrectionDecl()); 6853 return true; 6854 } 6855 return false; 6856} 6857 6858Decl *Sema::ActOnUsingDirective(Scope *S, 6859 SourceLocation UsingLoc, 6860 SourceLocation NamespcLoc, 6861 CXXScopeSpec &SS, 6862 SourceLocation IdentLoc, 6863 IdentifierInfo *NamespcName, 6864 AttributeList *AttrList) { 6865 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6866 assert(NamespcName && "Invalid NamespcName."); 6867 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6868 6869 // This can only happen along a recovery path. 6870 while (S->getFlags() & Scope::TemplateParamScope) 6871 S = S->getParent(); 6872 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6873 6874 UsingDirectiveDecl *UDir = 0; 6875 NestedNameSpecifier *Qualifier = 0; 6876 if (SS.isSet()) 6877 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6878 6879 // Lookup namespace name. 6880 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6881 LookupParsedName(R, S, &SS); 6882 if (R.isAmbiguous()) 6883 return 0; 6884 6885 if (R.empty()) { 6886 R.clear(); 6887 // Allow "using namespace std;" or "using namespace ::std;" even if 6888 // "std" hasn't been defined yet, for GCC compatibility. 6889 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6890 NamespcName->isStr("std")) { 6891 Diag(IdentLoc, diag::ext_using_undefined_std); 6892 R.addDecl(getOrCreateStdNamespace()); 6893 R.resolveKind(); 6894 } 6895 // Otherwise, attempt typo correction. 6896 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6897 } 6898 6899 if (!R.empty()) { 6900 NamedDecl *Named = R.getFoundDecl(); 6901 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6902 && "expected namespace decl"); 6903 // C++ [namespace.udir]p1: 6904 // A using-directive specifies that the names in the nominated 6905 // namespace can be used in the scope in which the 6906 // using-directive appears after the using-directive. During 6907 // unqualified name lookup (3.4.1), the names appear as if they 6908 // were declared in the nearest enclosing namespace which 6909 // contains both the using-directive and the nominated 6910 // namespace. [Note: in this context, "contains" means "contains 6911 // directly or indirectly". ] 6912 6913 // Find enclosing context containing both using-directive and 6914 // nominated namespace. 6915 NamespaceDecl *NS = getNamespaceDecl(Named); 6916 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6917 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6918 CommonAncestor = CommonAncestor->getParent(); 6919 6920 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6921 SS.getWithLocInContext(Context), 6922 IdentLoc, Named, CommonAncestor); 6923 6924 if (IsUsingDirectiveInToplevelContext(CurContext) && 6925 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6926 Diag(IdentLoc, diag::warn_using_directive_in_header); 6927 } 6928 6929 PushUsingDirective(S, UDir); 6930 } else { 6931 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6932 } 6933 6934 if (UDir) 6935 ProcessDeclAttributeList(S, UDir, AttrList); 6936 6937 return UDir; 6938} 6939 6940void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6941 // If the scope has an associated entity and the using directive is at 6942 // namespace or translation unit scope, add the UsingDirectiveDecl into 6943 // its lookup structure so qualified name lookup can find it. 6944 DeclContext *Ctx = S->getEntity(); 6945 if (Ctx && !Ctx->isFunctionOrMethod()) 6946 Ctx->addDecl(UDir); 6947 else 6948 // Otherwise, it is at block sope. The using-directives will affect lookup 6949 // only to the end of the scope. 6950 S->PushUsingDirective(UDir); 6951} 6952 6953 6954Decl *Sema::ActOnUsingDeclaration(Scope *S, 6955 AccessSpecifier AS, 6956 bool HasUsingKeyword, 6957 SourceLocation UsingLoc, 6958 CXXScopeSpec &SS, 6959 UnqualifiedId &Name, 6960 AttributeList *AttrList, 6961 bool HasTypenameKeyword, 6962 SourceLocation TypenameLoc) { 6963 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6964 6965 switch (Name.getKind()) { 6966 case UnqualifiedId::IK_ImplicitSelfParam: 6967 case UnqualifiedId::IK_Identifier: 6968 case UnqualifiedId::IK_OperatorFunctionId: 6969 case UnqualifiedId::IK_LiteralOperatorId: 6970 case UnqualifiedId::IK_ConversionFunctionId: 6971 break; 6972 6973 case UnqualifiedId::IK_ConstructorName: 6974 case UnqualifiedId::IK_ConstructorTemplateId: 6975 // C++11 inheriting constructors. 6976 Diag(Name.getLocStart(), 6977 getLangOpts().CPlusPlus11 ? 6978 diag::warn_cxx98_compat_using_decl_constructor : 6979 diag::err_using_decl_constructor) 6980 << SS.getRange(); 6981 6982 if (getLangOpts().CPlusPlus11) break; 6983 6984 return 0; 6985 6986 case UnqualifiedId::IK_DestructorName: 6987 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6988 << SS.getRange(); 6989 return 0; 6990 6991 case UnqualifiedId::IK_TemplateId: 6992 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6993 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6994 return 0; 6995 } 6996 6997 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6998 DeclarationName TargetName = TargetNameInfo.getName(); 6999 if (!TargetName) 7000 return 0; 7001 7002 // Warn about access declarations. 7003 if (!HasUsingKeyword) { 7004 Diag(Name.getLocStart(), 7005 getLangOpts().CPlusPlus11 ? diag::err_access_decl 7006 : diag::warn_access_decl_deprecated) 7007 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 7008 } 7009 7010 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 7011 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 7012 return 0; 7013 7014 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 7015 TargetNameInfo, AttrList, 7016 /* IsInstantiation */ false, 7017 HasTypenameKeyword, TypenameLoc); 7018 if (UD) 7019 PushOnScopeChains(UD, S, /*AddToContext*/ false); 7020 7021 return UD; 7022} 7023 7024/// \brief Determine whether a using declaration considers the given 7025/// declarations as "equivalent", e.g., if they are redeclarations of 7026/// the same entity or are both typedefs of the same type. 7027static bool 7028IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 7029 bool &SuppressRedeclaration) { 7030 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 7031 SuppressRedeclaration = false; 7032 return true; 7033 } 7034 7035 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 7036 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 7037 SuppressRedeclaration = true; 7038 return Context.hasSameType(TD1->getUnderlyingType(), 7039 TD2->getUnderlyingType()); 7040 } 7041 7042 return false; 7043} 7044 7045 7046/// Determines whether to create a using shadow decl for a particular 7047/// decl, given the set of decls existing prior to this using lookup. 7048bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 7049 const LookupResult &Previous) { 7050 // Diagnose finding a decl which is not from a base class of the 7051 // current class. We do this now because there are cases where this 7052 // function will silently decide not to build a shadow decl, which 7053 // will pre-empt further diagnostics. 7054 // 7055 // We don't need to do this in C++0x because we do the check once on 7056 // the qualifier. 7057 // 7058 // FIXME: diagnose the following if we care enough: 7059 // struct A { int foo; }; 7060 // struct B : A { using A::foo; }; 7061 // template <class T> struct C : A {}; 7062 // template <class T> struct D : C<T> { using B::foo; } // <--- 7063 // This is invalid (during instantiation) in C++03 because B::foo 7064 // resolves to the using decl in B, which is not a base class of D<T>. 7065 // We can't diagnose it immediately because C<T> is an unknown 7066 // specialization. The UsingShadowDecl in D<T> then points directly 7067 // to A::foo, which will look well-formed when we instantiate. 7068 // The right solution is to not collapse the shadow-decl chain. 7069 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 7070 DeclContext *OrigDC = Orig->getDeclContext(); 7071 7072 // Handle enums and anonymous structs. 7073 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 7074 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 7075 while (OrigRec->isAnonymousStructOrUnion()) 7076 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 7077 7078 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 7079 if (OrigDC == CurContext) { 7080 Diag(Using->getLocation(), 7081 diag::err_using_decl_nested_name_specifier_is_current_class) 7082 << Using->getQualifierLoc().getSourceRange(); 7083 Diag(Orig->getLocation(), diag::note_using_decl_target); 7084 return true; 7085 } 7086 7087 Diag(Using->getQualifierLoc().getBeginLoc(), 7088 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7089 << Using->getQualifier() 7090 << cast<CXXRecordDecl>(CurContext) 7091 << Using->getQualifierLoc().getSourceRange(); 7092 Diag(Orig->getLocation(), diag::note_using_decl_target); 7093 return true; 7094 } 7095 } 7096 7097 if (Previous.empty()) return false; 7098 7099 NamedDecl *Target = Orig; 7100 if (isa<UsingShadowDecl>(Target)) 7101 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7102 7103 // If the target happens to be one of the previous declarations, we 7104 // don't have a conflict. 7105 // 7106 // FIXME: but we might be increasing its access, in which case we 7107 // should redeclare it. 7108 NamedDecl *NonTag = 0, *Tag = 0; 7109 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 7110 I != E; ++I) { 7111 NamedDecl *D = (*I)->getUnderlyingDecl(); 7112 bool Result; 7113 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 7114 return Result; 7115 7116 (isa<TagDecl>(D) ? Tag : NonTag) = D; 7117 } 7118 7119 if (Target->isFunctionOrFunctionTemplate()) { 7120 FunctionDecl *FD; 7121 if (isa<FunctionTemplateDecl>(Target)) 7122 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 7123 else 7124 FD = cast<FunctionDecl>(Target); 7125 7126 NamedDecl *OldDecl = 0; 7127 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 7128 case Ovl_Overload: 7129 return false; 7130 7131 case Ovl_NonFunction: 7132 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7133 break; 7134 7135 // We found a decl with the exact signature. 7136 case Ovl_Match: 7137 // If we're in a record, we want to hide the target, so we 7138 // return true (without a diagnostic) to tell the caller not to 7139 // build a shadow decl. 7140 if (CurContext->isRecord()) 7141 return true; 7142 7143 // If we're not in a record, this is an error. 7144 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7145 break; 7146 } 7147 7148 Diag(Target->getLocation(), diag::note_using_decl_target); 7149 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 7150 return true; 7151 } 7152 7153 // Target is not a function. 7154 7155 if (isa<TagDecl>(Target)) { 7156 // No conflict between a tag and a non-tag. 7157 if (!Tag) return false; 7158 7159 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7160 Diag(Target->getLocation(), diag::note_using_decl_target); 7161 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 7162 return true; 7163 } 7164 7165 // No conflict between a tag and a non-tag. 7166 if (!NonTag) return false; 7167 7168 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7169 Diag(Target->getLocation(), diag::note_using_decl_target); 7170 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 7171 return true; 7172} 7173 7174/// Builds a shadow declaration corresponding to a 'using' declaration. 7175UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 7176 UsingDecl *UD, 7177 NamedDecl *Orig) { 7178 7179 // If we resolved to another shadow declaration, just coalesce them. 7180 NamedDecl *Target = Orig; 7181 if (isa<UsingShadowDecl>(Target)) { 7182 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7183 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 7184 } 7185 7186 UsingShadowDecl *Shadow 7187 = UsingShadowDecl::Create(Context, CurContext, 7188 UD->getLocation(), UD, Target); 7189 UD->addShadowDecl(Shadow); 7190 7191 Shadow->setAccess(UD->getAccess()); 7192 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 7193 Shadow->setInvalidDecl(); 7194 7195 if (S) 7196 PushOnScopeChains(Shadow, S); 7197 else 7198 CurContext->addDecl(Shadow); 7199 7200 7201 return Shadow; 7202} 7203 7204/// Hides a using shadow declaration. This is required by the current 7205/// using-decl implementation when a resolvable using declaration in a 7206/// class is followed by a declaration which would hide or override 7207/// one or more of the using decl's targets; for example: 7208/// 7209/// struct Base { void foo(int); }; 7210/// struct Derived : Base { 7211/// using Base::foo; 7212/// void foo(int); 7213/// }; 7214/// 7215/// The governing language is C++03 [namespace.udecl]p12: 7216/// 7217/// When a using-declaration brings names from a base class into a 7218/// derived class scope, member functions in the derived class 7219/// override and/or hide member functions with the same name and 7220/// parameter types in a base class (rather than conflicting). 7221/// 7222/// There are two ways to implement this: 7223/// (1) optimistically create shadow decls when they're not hidden 7224/// by existing declarations, or 7225/// (2) don't create any shadow decls (or at least don't make them 7226/// visible) until we've fully parsed/instantiated the class. 7227/// The problem with (1) is that we might have to retroactively remove 7228/// a shadow decl, which requires several O(n) operations because the 7229/// decl structures are (very reasonably) not designed for removal. 7230/// (2) avoids this but is very fiddly and phase-dependent. 7231void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 7232 if (Shadow->getDeclName().getNameKind() == 7233 DeclarationName::CXXConversionFunctionName) 7234 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 7235 7236 // Remove it from the DeclContext... 7237 Shadow->getDeclContext()->removeDecl(Shadow); 7238 7239 // ...and the scope, if applicable... 7240 if (S) { 7241 S->RemoveDecl(Shadow); 7242 IdResolver.RemoveDecl(Shadow); 7243 } 7244 7245 // ...and the using decl. 7246 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 7247 7248 // TODO: complain somehow if Shadow was used. It shouldn't 7249 // be possible for this to happen, because...? 7250} 7251 7252namespace { 7253class UsingValidatorCCC : public CorrectionCandidateCallback { 7254public: 7255 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation) 7256 : HasTypenameKeyword(HasTypenameKeyword), 7257 IsInstantiation(IsInstantiation) {} 7258 7259 bool ValidateCandidate(const TypoCorrection &Candidate) LLVM_OVERRIDE { 7260 NamedDecl *ND = Candidate.getCorrectionDecl(); 7261 7262 // Keywords are not valid here. 7263 if (!ND || isa<NamespaceDecl>(ND)) 7264 return false; 7265 7266 // Completely unqualified names are invalid for a 'using' declaration. 7267 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) 7268 return false; 7269 7270 if (isa<TypeDecl>(ND)) 7271 return HasTypenameKeyword || !IsInstantiation; 7272 7273 return !HasTypenameKeyword; 7274 } 7275 7276private: 7277 bool HasTypenameKeyword; 7278 bool IsInstantiation; 7279}; 7280} // end anonymous namespace 7281 7282/// Builds a using declaration. 7283/// 7284/// \param IsInstantiation - Whether this call arises from an 7285/// instantiation of an unresolved using declaration. We treat 7286/// the lookup differently for these declarations. 7287NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7288 SourceLocation UsingLoc, 7289 CXXScopeSpec &SS, 7290 const DeclarationNameInfo &NameInfo, 7291 AttributeList *AttrList, 7292 bool IsInstantiation, 7293 bool HasTypenameKeyword, 7294 SourceLocation TypenameLoc) { 7295 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7296 SourceLocation IdentLoc = NameInfo.getLoc(); 7297 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7298 7299 // FIXME: We ignore attributes for now. 7300 7301 if (SS.isEmpty()) { 7302 Diag(IdentLoc, diag::err_using_requires_qualname); 7303 return 0; 7304 } 7305 7306 // Do the redeclaration lookup in the current scope. 7307 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7308 ForRedeclaration); 7309 Previous.setHideTags(false); 7310 if (S) { 7311 LookupName(Previous, S); 7312 7313 // It is really dumb that we have to do this. 7314 LookupResult::Filter F = Previous.makeFilter(); 7315 while (F.hasNext()) { 7316 NamedDecl *D = F.next(); 7317 if (!isDeclInScope(D, CurContext, S)) 7318 F.erase(); 7319 } 7320 F.done(); 7321 } else { 7322 assert(IsInstantiation && "no scope in non-instantiation"); 7323 assert(CurContext->isRecord() && "scope not record in instantiation"); 7324 LookupQualifiedName(Previous, CurContext); 7325 } 7326 7327 // Check for invalid redeclarations. 7328 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, 7329 SS, IdentLoc, Previous)) 7330 return 0; 7331 7332 // Check for bad qualifiers. 7333 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7334 return 0; 7335 7336 DeclContext *LookupContext = computeDeclContext(SS); 7337 NamedDecl *D; 7338 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7339 if (!LookupContext) { 7340 if (HasTypenameKeyword) { 7341 // FIXME: not all declaration name kinds are legal here 7342 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7343 UsingLoc, TypenameLoc, 7344 QualifierLoc, 7345 IdentLoc, NameInfo.getName()); 7346 } else { 7347 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7348 QualifierLoc, NameInfo); 7349 } 7350 } else { 7351 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7352 NameInfo, HasTypenameKeyword); 7353 } 7354 D->setAccess(AS); 7355 CurContext->addDecl(D); 7356 7357 if (!LookupContext) return D; 7358 UsingDecl *UD = cast<UsingDecl>(D); 7359 7360 if (RequireCompleteDeclContext(SS, LookupContext)) { 7361 UD->setInvalidDecl(); 7362 return UD; 7363 } 7364 7365 // The normal rules do not apply to inheriting constructor declarations. 7366 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7367 if (CheckInheritingConstructorUsingDecl(UD)) 7368 UD->setInvalidDecl(); 7369 return UD; 7370 } 7371 7372 // Otherwise, look up the target name. 7373 7374 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7375 7376 // Unlike most lookups, we don't always want to hide tag 7377 // declarations: tag names are visible through the using declaration 7378 // even if hidden by ordinary names, *except* in a dependent context 7379 // where it's important for the sanity of two-phase lookup. 7380 if (!IsInstantiation) 7381 R.setHideTags(false); 7382 7383 // For the purposes of this lookup, we have a base object type 7384 // equal to that of the current context. 7385 if (CurContext->isRecord()) { 7386 R.setBaseObjectType( 7387 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7388 } 7389 7390 LookupQualifiedName(R, LookupContext); 7391 7392 // Try to correct typos if possible. 7393 if (R.empty()) { 7394 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation); 7395 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(), 7396 R.getLookupKind(), S, &SS, CCC)){ 7397 // We reject any correction for which ND would be NULL. 7398 NamedDecl *ND = Corrected.getCorrectionDecl(); 7399 R.setLookupName(Corrected.getCorrection()); 7400 R.addDecl(ND); 7401 // We reject candidates where DroppedSpecifier == true, hence the 7402 // literal '0' below. 7403 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) 7404 << NameInfo.getName() << LookupContext << 0 7405 << SS.getRange()); 7406 } else { 7407 Diag(IdentLoc, diag::err_no_member) 7408 << NameInfo.getName() << LookupContext << SS.getRange(); 7409 UD->setInvalidDecl(); 7410 return UD; 7411 } 7412 } 7413 7414 if (R.isAmbiguous()) { 7415 UD->setInvalidDecl(); 7416 return UD; 7417 } 7418 7419 if (HasTypenameKeyword) { 7420 // If we asked for a typename and got a non-type decl, error out. 7421 if (!R.getAsSingle<TypeDecl>()) { 7422 Diag(IdentLoc, diag::err_using_typename_non_type); 7423 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7424 Diag((*I)->getUnderlyingDecl()->getLocation(), 7425 diag::note_using_decl_target); 7426 UD->setInvalidDecl(); 7427 return UD; 7428 } 7429 } else { 7430 // If we asked for a non-typename and we got a type, error out, 7431 // but only if this is an instantiation of an unresolved using 7432 // decl. Otherwise just silently find the type name. 7433 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7434 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7435 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7436 UD->setInvalidDecl(); 7437 return UD; 7438 } 7439 } 7440 7441 // C++0x N2914 [namespace.udecl]p6: 7442 // A using-declaration shall not name a namespace. 7443 if (R.getAsSingle<NamespaceDecl>()) { 7444 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7445 << SS.getRange(); 7446 UD->setInvalidDecl(); 7447 return UD; 7448 } 7449 7450 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7451 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7452 BuildUsingShadowDecl(S, UD, *I); 7453 } 7454 7455 return UD; 7456} 7457 7458/// Additional checks for a using declaration referring to a constructor name. 7459bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7460 assert(!UD->hasTypename() && "expecting a constructor name"); 7461 7462 const Type *SourceType = UD->getQualifier()->getAsType(); 7463 assert(SourceType && 7464 "Using decl naming constructor doesn't have type in scope spec."); 7465 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7466 7467 // Check whether the named type is a direct base class. 7468 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7469 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7470 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7471 BaseIt != BaseE; ++BaseIt) { 7472 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7473 if (CanonicalSourceType == BaseType) 7474 break; 7475 if (BaseIt->getType()->isDependentType()) 7476 break; 7477 } 7478 7479 if (BaseIt == BaseE) { 7480 // Did not find SourceType in the bases. 7481 Diag(UD->getUsingLoc(), 7482 diag::err_using_decl_constructor_not_in_direct_base) 7483 << UD->getNameInfo().getSourceRange() 7484 << QualType(SourceType, 0) << TargetClass; 7485 return true; 7486 } 7487 7488 if (!CurContext->isDependentContext()) 7489 BaseIt->setInheritConstructors(); 7490 7491 return false; 7492} 7493 7494/// Checks that the given using declaration is not an invalid 7495/// redeclaration. Note that this is checking only for the using decl 7496/// itself, not for any ill-formedness among the UsingShadowDecls. 7497bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7498 bool HasTypenameKeyword, 7499 const CXXScopeSpec &SS, 7500 SourceLocation NameLoc, 7501 const LookupResult &Prev) { 7502 // C++03 [namespace.udecl]p8: 7503 // C++0x [namespace.udecl]p10: 7504 // A using-declaration is a declaration and can therefore be used 7505 // repeatedly where (and only where) multiple declarations are 7506 // allowed. 7507 // 7508 // That's in non-member contexts. 7509 if (!CurContext->getRedeclContext()->isRecord()) 7510 return false; 7511 7512 NestedNameSpecifier *Qual 7513 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7514 7515 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7516 NamedDecl *D = *I; 7517 7518 bool DTypename; 7519 NestedNameSpecifier *DQual; 7520 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7521 DTypename = UD->hasTypename(); 7522 DQual = UD->getQualifier(); 7523 } else if (UnresolvedUsingValueDecl *UD 7524 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7525 DTypename = false; 7526 DQual = UD->getQualifier(); 7527 } else if (UnresolvedUsingTypenameDecl *UD 7528 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7529 DTypename = true; 7530 DQual = UD->getQualifier(); 7531 } else continue; 7532 7533 // using decls differ if one says 'typename' and the other doesn't. 7534 // FIXME: non-dependent using decls? 7535 if (HasTypenameKeyword != DTypename) continue; 7536 7537 // using decls differ if they name different scopes (but note that 7538 // template instantiation can cause this check to trigger when it 7539 // didn't before instantiation). 7540 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7541 Context.getCanonicalNestedNameSpecifier(DQual)) 7542 continue; 7543 7544 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7545 Diag(D->getLocation(), diag::note_using_decl) << 1; 7546 return true; 7547 } 7548 7549 return false; 7550} 7551 7552 7553/// Checks that the given nested-name qualifier used in a using decl 7554/// in the current context is appropriately related to the current 7555/// scope. If an error is found, diagnoses it and returns true. 7556bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7557 const CXXScopeSpec &SS, 7558 SourceLocation NameLoc) { 7559 DeclContext *NamedContext = computeDeclContext(SS); 7560 7561 if (!CurContext->isRecord()) { 7562 // C++03 [namespace.udecl]p3: 7563 // C++0x [namespace.udecl]p8: 7564 // A using-declaration for a class member shall be a member-declaration. 7565 7566 // If we weren't able to compute a valid scope, it must be a 7567 // dependent class scope. 7568 if (!NamedContext || NamedContext->isRecord()) { 7569 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7570 << SS.getRange(); 7571 return true; 7572 } 7573 7574 // Otherwise, everything is known to be fine. 7575 return false; 7576 } 7577 7578 // The current scope is a record. 7579 7580 // If the named context is dependent, we can't decide much. 7581 if (!NamedContext) { 7582 // FIXME: in C++0x, we can diagnose if we can prove that the 7583 // nested-name-specifier does not refer to a base class, which is 7584 // still possible in some cases. 7585 7586 // Otherwise we have to conservatively report that things might be 7587 // okay. 7588 return false; 7589 } 7590 7591 if (!NamedContext->isRecord()) { 7592 // Ideally this would point at the last name in the specifier, 7593 // but we don't have that level of source info. 7594 Diag(SS.getRange().getBegin(), 7595 diag::err_using_decl_nested_name_specifier_is_not_class) 7596 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7597 return true; 7598 } 7599 7600 if (!NamedContext->isDependentContext() && 7601 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7602 return true; 7603 7604 if (getLangOpts().CPlusPlus11) { 7605 // C++0x [namespace.udecl]p3: 7606 // In a using-declaration used as a member-declaration, the 7607 // nested-name-specifier shall name a base class of the class 7608 // being defined. 7609 7610 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7611 cast<CXXRecordDecl>(NamedContext))) { 7612 if (CurContext == NamedContext) { 7613 Diag(NameLoc, 7614 diag::err_using_decl_nested_name_specifier_is_current_class) 7615 << SS.getRange(); 7616 return true; 7617 } 7618 7619 Diag(SS.getRange().getBegin(), 7620 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7621 << (NestedNameSpecifier*) SS.getScopeRep() 7622 << cast<CXXRecordDecl>(CurContext) 7623 << SS.getRange(); 7624 return true; 7625 } 7626 7627 return false; 7628 } 7629 7630 // C++03 [namespace.udecl]p4: 7631 // A using-declaration used as a member-declaration shall refer 7632 // to a member of a base class of the class being defined [etc.]. 7633 7634 // Salient point: SS doesn't have to name a base class as long as 7635 // lookup only finds members from base classes. Therefore we can 7636 // diagnose here only if we can prove that that can't happen, 7637 // i.e. if the class hierarchies provably don't intersect. 7638 7639 // TODO: it would be nice if "definitely valid" results were cached 7640 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7641 // need to be repeated. 7642 7643 struct UserData { 7644 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7645 7646 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7647 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7648 Data->Bases.insert(Base); 7649 return true; 7650 } 7651 7652 bool hasDependentBases(const CXXRecordDecl *Class) { 7653 return !Class->forallBases(collect, this); 7654 } 7655 7656 /// Returns true if the base is dependent or is one of the 7657 /// accumulated base classes. 7658 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7659 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7660 return !Data->Bases.count(Base); 7661 } 7662 7663 bool mightShareBases(const CXXRecordDecl *Class) { 7664 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7665 } 7666 }; 7667 7668 UserData Data; 7669 7670 // Returns false if we find a dependent base. 7671 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7672 return false; 7673 7674 // Returns false if the class has a dependent base or if it or one 7675 // of its bases is present in the base set of the current context. 7676 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7677 return false; 7678 7679 Diag(SS.getRange().getBegin(), 7680 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7681 << (NestedNameSpecifier*) SS.getScopeRep() 7682 << cast<CXXRecordDecl>(CurContext) 7683 << SS.getRange(); 7684 7685 return true; 7686} 7687 7688Decl *Sema::ActOnAliasDeclaration(Scope *S, 7689 AccessSpecifier AS, 7690 MultiTemplateParamsArg TemplateParamLists, 7691 SourceLocation UsingLoc, 7692 UnqualifiedId &Name, 7693 AttributeList *AttrList, 7694 TypeResult Type) { 7695 // Skip up to the relevant declaration scope. 7696 while (S->getFlags() & Scope::TemplateParamScope) 7697 S = S->getParent(); 7698 assert((S->getFlags() & Scope::DeclScope) && 7699 "got alias-declaration outside of declaration scope"); 7700 7701 if (Type.isInvalid()) 7702 return 0; 7703 7704 bool Invalid = false; 7705 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7706 TypeSourceInfo *TInfo = 0; 7707 GetTypeFromParser(Type.get(), &TInfo); 7708 7709 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7710 return 0; 7711 7712 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7713 UPPC_DeclarationType)) { 7714 Invalid = true; 7715 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7716 TInfo->getTypeLoc().getBeginLoc()); 7717 } 7718 7719 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7720 LookupName(Previous, S); 7721 7722 // Warn about shadowing the name of a template parameter. 7723 if (Previous.isSingleResult() && 7724 Previous.getFoundDecl()->isTemplateParameter()) { 7725 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7726 Previous.clear(); 7727 } 7728 7729 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7730 "name in alias declaration must be an identifier"); 7731 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7732 Name.StartLocation, 7733 Name.Identifier, TInfo); 7734 7735 NewTD->setAccess(AS); 7736 7737 if (Invalid) 7738 NewTD->setInvalidDecl(); 7739 7740 ProcessDeclAttributeList(S, NewTD, AttrList); 7741 7742 CheckTypedefForVariablyModifiedType(S, NewTD); 7743 Invalid |= NewTD->isInvalidDecl(); 7744 7745 bool Redeclaration = false; 7746 7747 NamedDecl *NewND; 7748 if (TemplateParamLists.size()) { 7749 TypeAliasTemplateDecl *OldDecl = 0; 7750 TemplateParameterList *OldTemplateParams = 0; 7751 7752 if (TemplateParamLists.size() != 1) { 7753 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7754 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7755 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7756 } 7757 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7758 7759 // Only consider previous declarations in the same scope. 7760 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7761 /*ExplicitInstantiationOrSpecialization*/false); 7762 if (!Previous.empty()) { 7763 Redeclaration = true; 7764 7765 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7766 if (!OldDecl && !Invalid) { 7767 Diag(UsingLoc, diag::err_redefinition_different_kind) 7768 << Name.Identifier; 7769 7770 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7771 if (OldD->getLocation().isValid()) 7772 Diag(OldD->getLocation(), diag::note_previous_definition); 7773 7774 Invalid = true; 7775 } 7776 7777 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7778 if (TemplateParameterListsAreEqual(TemplateParams, 7779 OldDecl->getTemplateParameters(), 7780 /*Complain=*/true, 7781 TPL_TemplateMatch)) 7782 OldTemplateParams = OldDecl->getTemplateParameters(); 7783 else 7784 Invalid = true; 7785 7786 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7787 if (!Invalid && 7788 !Context.hasSameType(OldTD->getUnderlyingType(), 7789 NewTD->getUnderlyingType())) { 7790 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7791 // but we can't reasonably accept it. 7792 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7793 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7794 if (OldTD->getLocation().isValid()) 7795 Diag(OldTD->getLocation(), diag::note_previous_definition); 7796 Invalid = true; 7797 } 7798 } 7799 } 7800 7801 // Merge any previous default template arguments into our parameters, 7802 // and check the parameter list. 7803 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7804 TPC_TypeAliasTemplate)) 7805 return 0; 7806 7807 TypeAliasTemplateDecl *NewDecl = 7808 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7809 Name.Identifier, TemplateParams, 7810 NewTD); 7811 7812 NewDecl->setAccess(AS); 7813 7814 if (Invalid) 7815 NewDecl->setInvalidDecl(); 7816 else if (OldDecl) 7817 NewDecl->setPreviousDeclaration(OldDecl); 7818 7819 NewND = NewDecl; 7820 } else { 7821 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7822 NewND = NewTD; 7823 } 7824 7825 if (!Redeclaration) 7826 PushOnScopeChains(NewND, S); 7827 7828 ActOnDocumentableDecl(NewND); 7829 return NewND; 7830} 7831 7832Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7833 SourceLocation NamespaceLoc, 7834 SourceLocation AliasLoc, 7835 IdentifierInfo *Alias, 7836 CXXScopeSpec &SS, 7837 SourceLocation IdentLoc, 7838 IdentifierInfo *Ident) { 7839 7840 // Lookup the namespace name. 7841 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7842 LookupParsedName(R, S, &SS); 7843 7844 // Check if we have a previous declaration with the same name. 7845 NamedDecl *PrevDecl 7846 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7847 ForRedeclaration); 7848 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7849 PrevDecl = 0; 7850 7851 if (PrevDecl) { 7852 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7853 // We already have an alias with the same name that points to the same 7854 // namespace, so don't create a new one. 7855 // FIXME: At some point, we'll want to create the (redundant) 7856 // declaration to maintain better source information. 7857 if (!R.isAmbiguous() && !R.empty() && 7858 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7859 return 0; 7860 } 7861 7862 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7863 diag::err_redefinition_different_kind; 7864 Diag(AliasLoc, DiagID) << Alias; 7865 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7866 return 0; 7867 } 7868 7869 if (R.isAmbiguous()) 7870 return 0; 7871 7872 if (R.empty()) { 7873 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7874 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7875 return 0; 7876 } 7877 } 7878 7879 NamespaceAliasDecl *AliasDecl = 7880 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7881 Alias, SS.getWithLocInContext(Context), 7882 IdentLoc, R.getFoundDecl()); 7883 7884 PushOnScopeChains(AliasDecl, S); 7885 return AliasDecl; 7886} 7887 7888Sema::ImplicitExceptionSpecification 7889Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7890 CXXMethodDecl *MD) { 7891 CXXRecordDecl *ClassDecl = MD->getParent(); 7892 7893 // C++ [except.spec]p14: 7894 // An implicitly declared special member function (Clause 12) shall have an 7895 // exception-specification. [...] 7896 ImplicitExceptionSpecification ExceptSpec(*this); 7897 if (ClassDecl->isInvalidDecl()) 7898 return ExceptSpec; 7899 7900 // Direct base-class constructors. 7901 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7902 BEnd = ClassDecl->bases_end(); 7903 B != BEnd; ++B) { 7904 if (B->isVirtual()) // Handled below. 7905 continue; 7906 7907 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7908 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7909 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7910 // If this is a deleted function, add it anyway. This might be conformant 7911 // with the standard. This might not. I'm not sure. It might not matter. 7912 if (Constructor) 7913 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7914 } 7915 } 7916 7917 // Virtual base-class constructors. 7918 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7919 BEnd = ClassDecl->vbases_end(); 7920 B != BEnd; ++B) { 7921 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7922 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7923 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7924 // If this is a deleted function, add it anyway. This might be conformant 7925 // with the standard. This might not. I'm not sure. It might not matter. 7926 if (Constructor) 7927 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7928 } 7929 } 7930 7931 // Field constructors. 7932 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7933 FEnd = ClassDecl->field_end(); 7934 F != FEnd; ++F) { 7935 if (F->hasInClassInitializer()) { 7936 if (Expr *E = F->getInClassInitializer()) 7937 ExceptSpec.CalledExpr(E); 7938 else if (!F->isInvalidDecl()) 7939 // DR1351: 7940 // If the brace-or-equal-initializer of a non-static data member 7941 // invokes a defaulted default constructor of its class or of an 7942 // enclosing class in a potentially evaluated subexpression, the 7943 // program is ill-formed. 7944 // 7945 // This resolution is unworkable: the exception specification of the 7946 // default constructor can be needed in an unevaluated context, in 7947 // particular, in the operand of a noexcept-expression, and we can be 7948 // unable to compute an exception specification for an enclosed class. 7949 // 7950 // We do not allow an in-class initializer to require the evaluation 7951 // of the exception specification for any in-class initializer whose 7952 // definition is not lexically complete. 7953 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7954 } else if (const RecordType *RecordTy 7955 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7956 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7957 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7958 // If this is a deleted function, add it anyway. This might be conformant 7959 // with the standard. This might not. I'm not sure. It might not matter. 7960 // In particular, the problem is that this function never gets called. It 7961 // might just be ill-formed because this function attempts to refer to 7962 // a deleted function here. 7963 if (Constructor) 7964 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7965 } 7966 } 7967 7968 return ExceptSpec; 7969} 7970 7971Sema::ImplicitExceptionSpecification 7972Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7973 CXXRecordDecl *ClassDecl = CD->getParent(); 7974 7975 // C++ [except.spec]p14: 7976 // An inheriting constructor [...] shall have an exception-specification. [...] 7977 ImplicitExceptionSpecification ExceptSpec(*this); 7978 if (ClassDecl->isInvalidDecl()) 7979 return ExceptSpec; 7980 7981 // Inherited constructor. 7982 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7983 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7984 // FIXME: Copying or moving the parameters could add extra exceptions to the 7985 // set, as could the default arguments for the inherited constructor. This 7986 // will be addressed when we implement the resolution of core issue 1351. 7987 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7988 7989 // Direct base-class constructors. 7990 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7991 BEnd = ClassDecl->bases_end(); 7992 B != BEnd; ++B) { 7993 if (B->isVirtual()) // Handled below. 7994 continue; 7995 7996 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7997 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7998 if (BaseClassDecl == InheritedDecl) 7999 continue; 8000 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 8001 if (Constructor) 8002 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8003 } 8004 } 8005 8006 // Virtual base-class constructors. 8007 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8008 BEnd = ClassDecl->vbases_end(); 8009 B != BEnd; ++B) { 8010 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8011 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8012 if (BaseClassDecl == InheritedDecl) 8013 continue; 8014 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 8015 if (Constructor) 8016 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8017 } 8018 } 8019 8020 // Field constructors. 8021 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8022 FEnd = ClassDecl->field_end(); 8023 F != FEnd; ++F) { 8024 if (F->hasInClassInitializer()) { 8025 if (Expr *E = F->getInClassInitializer()) 8026 ExceptSpec.CalledExpr(E); 8027 else if (!F->isInvalidDecl()) 8028 Diag(CD->getLocation(), 8029 diag::err_in_class_initializer_references_def_ctor) << CD; 8030 } else if (const RecordType *RecordTy 8031 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8032 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8033 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 8034 if (Constructor) 8035 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8036 } 8037 } 8038 8039 return ExceptSpec; 8040} 8041 8042namespace { 8043/// RAII object to register a special member as being currently declared. 8044struct DeclaringSpecialMember { 8045 Sema &S; 8046 Sema::SpecialMemberDecl D; 8047 bool WasAlreadyBeingDeclared; 8048 8049 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 8050 : S(S), D(RD, CSM) { 8051 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 8052 if (WasAlreadyBeingDeclared) 8053 // This almost never happens, but if it does, ensure that our cache 8054 // doesn't contain a stale result. 8055 S.SpecialMemberCache.clear(); 8056 8057 // FIXME: Register a note to be produced if we encounter an error while 8058 // declaring the special member. 8059 } 8060 ~DeclaringSpecialMember() { 8061 if (!WasAlreadyBeingDeclared) 8062 S.SpecialMembersBeingDeclared.erase(D); 8063 } 8064 8065 /// \brief Are we already trying to declare this special member? 8066 bool isAlreadyBeingDeclared() const { 8067 return WasAlreadyBeingDeclared; 8068 } 8069}; 8070} 8071 8072CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 8073 CXXRecordDecl *ClassDecl) { 8074 // C++ [class.ctor]p5: 8075 // A default constructor for a class X is a constructor of class X 8076 // that can be called without an argument. If there is no 8077 // user-declared constructor for class X, a default constructor is 8078 // implicitly declared. An implicitly-declared default constructor 8079 // is an inline public member of its class. 8080 assert(ClassDecl->needsImplicitDefaultConstructor() && 8081 "Should not build implicit default constructor!"); 8082 8083 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 8084 if (DSM.isAlreadyBeingDeclared()) 8085 return 0; 8086 8087 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8088 CXXDefaultConstructor, 8089 false); 8090 8091 // Create the actual constructor declaration. 8092 CanQualType ClassType 8093 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8094 SourceLocation ClassLoc = ClassDecl->getLocation(); 8095 DeclarationName Name 8096 = Context.DeclarationNames.getCXXConstructorName(ClassType); 8097 DeclarationNameInfo NameInfo(Name, ClassLoc); 8098 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 8099 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 8100 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8101 Constexpr); 8102 DefaultCon->setAccess(AS_public); 8103 DefaultCon->setDefaulted(); 8104 DefaultCon->setImplicit(); 8105 8106 // Build an exception specification pointing back at this constructor. 8107 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, DefaultCon); 8108 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8109 8110 // We don't need to use SpecialMemberIsTrivial here; triviality for default 8111 // constructors is easy to compute. 8112 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 8113 8114 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 8115 SetDeclDeleted(DefaultCon, ClassLoc); 8116 8117 // Note that we have declared this constructor. 8118 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 8119 8120 if (Scope *S = getScopeForContext(ClassDecl)) 8121 PushOnScopeChains(DefaultCon, S, false); 8122 ClassDecl->addDecl(DefaultCon); 8123 8124 return DefaultCon; 8125} 8126 8127void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 8128 CXXConstructorDecl *Constructor) { 8129 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 8130 !Constructor->doesThisDeclarationHaveABody() && 8131 !Constructor->isDeleted()) && 8132 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 8133 8134 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8135 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 8136 8137 SynthesizedFunctionScope Scope(*this, Constructor); 8138 DiagnosticErrorTrap Trap(Diags); 8139 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8140 Trap.hasErrorOccurred()) { 8141 Diag(CurrentLocation, diag::note_member_synthesized_at) 8142 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 8143 Constructor->setInvalidDecl(); 8144 return; 8145 } 8146 8147 SourceLocation Loc = Constructor->getLocation(); 8148 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8149 8150 Constructor->markUsed(Context); 8151 MarkVTableUsed(CurrentLocation, ClassDecl); 8152 8153 if (ASTMutationListener *L = getASTMutationListener()) { 8154 L->CompletedImplicitDefinition(Constructor); 8155 } 8156} 8157 8158void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 8159 // Check that any explicitly-defaulted methods have exception specifications 8160 // compatible with their implicit exception specifications. 8161 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 8162 8163 // Once all the member initializers are processed, perform checks to see if 8164 // any unintialized use is happeneing. 8165 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, 8166 D->getLocation()) 8167 == DiagnosticsEngine::Ignored) 8168 return; 8169 8170 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D); 8171 if (!RD) return; 8172 8173 // Holds fields that are uninitialized. 8174 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; 8175 8176 // In the beginning, every field is uninitialized. 8177 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end(); 8178 I != E; ++I) { 8179 if (FieldDecl *FD = dyn_cast<FieldDecl>(*I)) { 8180 UninitializedFields.insert(FD); 8181 } else if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) { 8182 UninitializedFields.insert(IFD->getAnonField()); 8183 } 8184 } 8185 8186 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end(); 8187 I != E; ++I) { 8188 FieldDecl *FD = dyn_cast<FieldDecl>(*I); 8189 if (!FD) 8190 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) 8191 FD = IFD->getAnonField(); 8192 8193 if (!FD) 8194 continue; 8195 8196 Expr *InitExpr = FD->getInClassInitializer(); 8197 if (!InitExpr) { 8198 // Uninitialized reference types will give an error. 8199 // Record types with an initializer are default initialized. 8200 QualType FieldType = FD->getType(); 8201 if (FieldType->isReferenceType() || FieldType->isRecordType()) 8202 UninitializedFields.erase(FD); 8203 continue; 8204 } 8205 8206 CheckInitExprContainsUninitializedFields( 8207 *this, InitExpr, FD, UninitializedFields, 8208 UninitializedFields.count(FD)/*WarnOnSelfReference*/); 8209 8210 UninitializedFields.erase(FD); 8211 } 8212} 8213 8214namespace { 8215/// Information on inheriting constructors to declare. 8216class InheritingConstructorInfo { 8217public: 8218 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 8219 : SemaRef(SemaRef), Derived(Derived) { 8220 // Mark the constructors that we already have in the derived class. 8221 // 8222 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 8223 // unless there is a user-declared constructor with the same signature in 8224 // the class where the using-declaration appears. 8225 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 8226 } 8227 8228 void inheritAll(CXXRecordDecl *RD) { 8229 visitAll(RD, &InheritingConstructorInfo::inherit); 8230 } 8231 8232private: 8233 /// Information about an inheriting constructor. 8234 struct InheritingConstructor { 8235 InheritingConstructor() 8236 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 8237 8238 /// If \c true, a constructor with this signature is already declared 8239 /// in the derived class. 8240 bool DeclaredInDerived; 8241 8242 /// The constructor which is inherited. 8243 const CXXConstructorDecl *BaseCtor; 8244 8245 /// The derived constructor we declared. 8246 CXXConstructorDecl *DerivedCtor; 8247 }; 8248 8249 /// Inheriting constructors with a given canonical type. There can be at 8250 /// most one such non-template constructor, and any number of templated 8251 /// constructors. 8252 struct InheritingConstructorsForType { 8253 InheritingConstructor NonTemplate; 8254 SmallVector<std::pair<TemplateParameterList *, InheritingConstructor>, 4> 8255 Templates; 8256 8257 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 8258 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 8259 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 8260 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 8261 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 8262 false, S.TPL_TemplateMatch)) 8263 return Templates[I].second; 8264 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 8265 return Templates.back().second; 8266 } 8267 8268 return NonTemplate; 8269 } 8270 }; 8271 8272 /// Get or create the inheriting constructor record for a constructor. 8273 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 8274 QualType CtorType) { 8275 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 8276 .getEntry(SemaRef, Ctor); 8277 } 8278 8279 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 8280 8281 /// Process all constructors for a class. 8282 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 8283 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 8284 CtorE = RD->ctor_end(); 8285 CtorIt != CtorE; ++CtorIt) 8286 (this->*Callback)(*CtorIt); 8287 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 8288 I(RD->decls_begin()), E(RD->decls_end()); 8289 I != E; ++I) { 8290 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 8291 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 8292 (this->*Callback)(CD); 8293 } 8294 } 8295 8296 /// Note that a constructor (or constructor template) was declared in Derived. 8297 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 8298 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 8299 } 8300 8301 /// Inherit a single constructor. 8302 void inherit(const CXXConstructorDecl *Ctor) { 8303 const FunctionProtoType *CtorType = 8304 Ctor->getType()->castAs<FunctionProtoType>(); 8305 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 8306 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 8307 8308 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 8309 8310 // Core issue (no number yet): the ellipsis is always discarded. 8311 if (EPI.Variadic) { 8312 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 8313 SemaRef.Diag(Ctor->getLocation(), 8314 diag::note_using_decl_constructor_ellipsis); 8315 EPI.Variadic = false; 8316 } 8317 8318 // Declare a constructor for each number of parameters. 8319 // 8320 // C++11 [class.inhctor]p1: 8321 // The candidate set of inherited constructors from the class X named in 8322 // the using-declaration consists of [... modulo defects ...] for each 8323 // constructor or constructor template of X, the set of constructors or 8324 // constructor templates that results from omitting any ellipsis parameter 8325 // specification and successively omitting parameters with a default 8326 // argument from the end of the parameter-type-list 8327 unsigned MinParams = minParamsToInherit(Ctor); 8328 unsigned Params = Ctor->getNumParams(); 8329 if (Params >= MinParams) { 8330 do 8331 declareCtor(UsingLoc, Ctor, 8332 SemaRef.Context.getFunctionType( 8333 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 8334 while (Params > MinParams && 8335 Ctor->getParamDecl(--Params)->hasDefaultArg()); 8336 } 8337 } 8338 8339 /// Find the using-declaration which specified that we should inherit the 8340 /// constructors of \p Base. 8341 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 8342 // No fancy lookup required; just look for the base constructor name 8343 // directly within the derived class. 8344 ASTContext &Context = SemaRef.Context; 8345 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8346 Context.getCanonicalType(Context.getRecordType(Base))); 8347 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8348 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8349 } 8350 8351 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8352 // C++11 [class.inhctor]p3: 8353 // [F]or each constructor template in the candidate set of inherited 8354 // constructors, a constructor template is implicitly declared 8355 if (Ctor->getDescribedFunctionTemplate()) 8356 return 0; 8357 8358 // For each non-template constructor in the candidate set of inherited 8359 // constructors other than a constructor having no parameters or a 8360 // copy/move constructor having a single parameter, a constructor is 8361 // implicitly declared [...] 8362 if (Ctor->getNumParams() == 0) 8363 return 1; 8364 if (Ctor->isCopyOrMoveConstructor()) 8365 return 2; 8366 8367 // Per discussion on core reflector, never inherit a constructor which 8368 // would become a default, copy, or move constructor of Derived either. 8369 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8370 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8371 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8372 } 8373 8374 /// Declare a single inheriting constructor, inheriting the specified 8375 /// constructor, with the given type. 8376 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8377 QualType DerivedType) { 8378 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8379 8380 // C++11 [class.inhctor]p3: 8381 // ... a constructor is implicitly declared with the same constructor 8382 // characteristics unless there is a user-declared constructor with 8383 // the same signature in the class where the using-declaration appears 8384 if (Entry.DeclaredInDerived) 8385 return; 8386 8387 // C++11 [class.inhctor]p7: 8388 // If two using-declarations declare inheriting constructors with the 8389 // same signature, the program is ill-formed 8390 if (Entry.DerivedCtor) { 8391 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8392 // Only diagnose this once per constructor. 8393 if (Entry.DerivedCtor->isInvalidDecl()) 8394 return; 8395 Entry.DerivedCtor->setInvalidDecl(); 8396 8397 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8398 SemaRef.Diag(BaseCtor->getLocation(), 8399 diag::note_using_decl_constructor_conflict_current_ctor); 8400 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8401 diag::note_using_decl_constructor_conflict_previous_ctor); 8402 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8403 diag::note_using_decl_constructor_conflict_previous_using); 8404 } else { 8405 // Core issue (no number): if the same inheriting constructor is 8406 // produced by multiple base class constructors from the same base 8407 // class, the inheriting constructor is defined as deleted. 8408 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8409 } 8410 8411 return; 8412 } 8413 8414 ASTContext &Context = SemaRef.Context; 8415 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8416 Context.getCanonicalType(Context.getRecordType(Derived))); 8417 DeclarationNameInfo NameInfo(Name, UsingLoc); 8418 8419 TemplateParameterList *TemplateParams = 0; 8420 if (const FunctionTemplateDecl *FTD = 8421 BaseCtor->getDescribedFunctionTemplate()) { 8422 TemplateParams = FTD->getTemplateParameters(); 8423 // We're reusing template parameters from a different DeclContext. This 8424 // is questionable at best, but works out because the template depth in 8425 // both places is guaranteed to be 0. 8426 // FIXME: Rebuild the template parameters in the new context, and 8427 // transform the function type to refer to them. 8428 } 8429 8430 // Build type source info pointing at the using-declaration. This is 8431 // required by template instantiation. 8432 TypeSourceInfo *TInfo = 8433 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8434 FunctionProtoTypeLoc ProtoLoc = 8435 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8436 8437 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8438 Context, Derived, UsingLoc, NameInfo, DerivedType, 8439 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8440 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8441 8442 // Build an unevaluated exception specification for this constructor. 8443 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8444 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8445 EPI.ExceptionSpecType = EST_Unevaluated; 8446 EPI.ExceptionSpecDecl = DerivedCtor; 8447 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8448 FPT->getArgTypes(), EPI)); 8449 8450 // Build the parameter declarations. 8451 SmallVector<ParmVarDecl *, 16> ParamDecls; 8452 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8453 TypeSourceInfo *TInfo = 8454 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8455 ParmVarDecl *PD = ParmVarDecl::Create( 8456 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8457 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8458 PD->setScopeInfo(0, I); 8459 PD->setImplicit(); 8460 ParamDecls.push_back(PD); 8461 ProtoLoc.setArg(I, PD); 8462 } 8463 8464 // Set up the new constructor. 8465 DerivedCtor->setAccess(BaseCtor->getAccess()); 8466 DerivedCtor->setParams(ParamDecls); 8467 DerivedCtor->setInheritedConstructor(BaseCtor); 8468 if (BaseCtor->isDeleted()) 8469 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8470 8471 // If this is a constructor template, build the template declaration. 8472 if (TemplateParams) { 8473 FunctionTemplateDecl *DerivedTemplate = 8474 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8475 TemplateParams, DerivedCtor); 8476 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8477 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8478 Derived->addDecl(DerivedTemplate); 8479 } else { 8480 Derived->addDecl(DerivedCtor); 8481 } 8482 8483 Entry.BaseCtor = BaseCtor; 8484 Entry.DerivedCtor = DerivedCtor; 8485 } 8486 8487 Sema &SemaRef; 8488 CXXRecordDecl *Derived; 8489 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8490 MapType Map; 8491}; 8492} 8493 8494void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8495 // Defer declaring the inheriting constructors until the class is 8496 // instantiated. 8497 if (ClassDecl->isDependentContext()) 8498 return; 8499 8500 // Find base classes from which we might inherit constructors. 8501 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8502 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8503 BaseE = ClassDecl->bases_end(); 8504 BaseIt != BaseE; ++BaseIt) 8505 if (BaseIt->getInheritConstructors()) 8506 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8507 8508 // Go no further if we're not inheriting any constructors. 8509 if (InheritedBases.empty()) 8510 return; 8511 8512 // Declare the inherited constructors. 8513 InheritingConstructorInfo ICI(*this, ClassDecl); 8514 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8515 ICI.inheritAll(InheritedBases[I]); 8516} 8517 8518void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8519 CXXConstructorDecl *Constructor) { 8520 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8521 assert(Constructor->getInheritedConstructor() && 8522 !Constructor->doesThisDeclarationHaveABody() && 8523 !Constructor->isDeleted()); 8524 8525 SynthesizedFunctionScope Scope(*this, Constructor); 8526 DiagnosticErrorTrap Trap(Diags); 8527 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8528 Trap.hasErrorOccurred()) { 8529 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8530 << Context.getTagDeclType(ClassDecl); 8531 Constructor->setInvalidDecl(); 8532 return; 8533 } 8534 8535 SourceLocation Loc = Constructor->getLocation(); 8536 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8537 8538 Constructor->markUsed(Context); 8539 MarkVTableUsed(CurrentLocation, ClassDecl); 8540 8541 if (ASTMutationListener *L = getASTMutationListener()) { 8542 L->CompletedImplicitDefinition(Constructor); 8543 } 8544} 8545 8546 8547Sema::ImplicitExceptionSpecification 8548Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8549 CXXRecordDecl *ClassDecl = MD->getParent(); 8550 8551 // C++ [except.spec]p14: 8552 // An implicitly declared special member function (Clause 12) shall have 8553 // an exception-specification. 8554 ImplicitExceptionSpecification ExceptSpec(*this); 8555 if (ClassDecl->isInvalidDecl()) 8556 return ExceptSpec; 8557 8558 // Direct base-class destructors. 8559 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8560 BEnd = ClassDecl->bases_end(); 8561 B != BEnd; ++B) { 8562 if (B->isVirtual()) // Handled below. 8563 continue; 8564 8565 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8566 ExceptSpec.CalledDecl(B->getLocStart(), 8567 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8568 } 8569 8570 // Virtual base-class destructors. 8571 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8572 BEnd = ClassDecl->vbases_end(); 8573 B != BEnd; ++B) { 8574 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8575 ExceptSpec.CalledDecl(B->getLocStart(), 8576 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8577 } 8578 8579 // Field destructors. 8580 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8581 FEnd = ClassDecl->field_end(); 8582 F != FEnd; ++F) { 8583 if (const RecordType *RecordTy 8584 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8585 ExceptSpec.CalledDecl(F->getLocation(), 8586 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8587 } 8588 8589 return ExceptSpec; 8590} 8591 8592CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8593 // C++ [class.dtor]p2: 8594 // If a class has no user-declared destructor, a destructor is 8595 // declared implicitly. An implicitly-declared destructor is an 8596 // inline public member of its class. 8597 assert(ClassDecl->needsImplicitDestructor()); 8598 8599 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8600 if (DSM.isAlreadyBeingDeclared()) 8601 return 0; 8602 8603 // Create the actual destructor declaration. 8604 CanQualType ClassType 8605 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8606 SourceLocation ClassLoc = ClassDecl->getLocation(); 8607 DeclarationName Name 8608 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8609 DeclarationNameInfo NameInfo(Name, ClassLoc); 8610 CXXDestructorDecl *Destructor 8611 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8612 QualType(), 0, /*isInline=*/true, 8613 /*isImplicitlyDeclared=*/true); 8614 Destructor->setAccess(AS_public); 8615 Destructor->setDefaulted(); 8616 Destructor->setImplicit(); 8617 8618 // Build an exception specification pointing back at this destructor. 8619 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, Destructor); 8620 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8621 8622 AddOverriddenMethods(ClassDecl, Destructor); 8623 8624 // We don't need to use SpecialMemberIsTrivial here; triviality for 8625 // destructors is easy to compute. 8626 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8627 8628 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8629 SetDeclDeleted(Destructor, ClassLoc); 8630 8631 // Note that we have declared this destructor. 8632 ++ASTContext::NumImplicitDestructorsDeclared; 8633 8634 // Introduce this destructor into its scope. 8635 if (Scope *S = getScopeForContext(ClassDecl)) 8636 PushOnScopeChains(Destructor, S, false); 8637 ClassDecl->addDecl(Destructor); 8638 8639 return Destructor; 8640} 8641 8642void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8643 CXXDestructorDecl *Destructor) { 8644 assert((Destructor->isDefaulted() && 8645 !Destructor->doesThisDeclarationHaveABody() && 8646 !Destructor->isDeleted()) && 8647 "DefineImplicitDestructor - call it for implicit default dtor"); 8648 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8649 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8650 8651 if (Destructor->isInvalidDecl()) 8652 return; 8653 8654 SynthesizedFunctionScope Scope(*this, Destructor); 8655 8656 DiagnosticErrorTrap Trap(Diags); 8657 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8658 Destructor->getParent()); 8659 8660 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8661 Diag(CurrentLocation, diag::note_member_synthesized_at) 8662 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8663 8664 Destructor->setInvalidDecl(); 8665 return; 8666 } 8667 8668 SourceLocation Loc = Destructor->getLocation(); 8669 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8670 Destructor->markUsed(Context); 8671 MarkVTableUsed(CurrentLocation, ClassDecl); 8672 8673 if (ASTMutationListener *L = getASTMutationListener()) { 8674 L->CompletedImplicitDefinition(Destructor); 8675 } 8676} 8677 8678/// \brief Perform any semantic analysis which needs to be delayed until all 8679/// pending class member declarations have been parsed. 8680void Sema::ActOnFinishCXXMemberDecls() { 8681 // If the context is an invalid C++ class, just suppress these checks. 8682 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8683 if (Record->isInvalidDecl()) { 8684 DelayedDestructorExceptionSpecChecks.clear(); 8685 return; 8686 } 8687 } 8688 8689 // Perform any deferred checking of exception specifications for virtual 8690 // destructors. 8691 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8692 i != e; ++i) { 8693 const CXXDestructorDecl *Dtor = 8694 DelayedDestructorExceptionSpecChecks[i].first; 8695 assert(!Dtor->getParent()->isDependentType() && 8696 "Should not ever add destructors of templates into the list."); 8697 CheckOverridingFunctionExceptionSpec(Dtor, 8698 DelayedDestructorExceptionSpecChecks[i].second); 8699 } 8700 DelayedDestructorExceptionSpecChecks.clear(); 8701} 8702 8703void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8704 CXXDestructorDecl *Destructor) { 8705 assert(getLangOpts().CPlusPlus11 && 8706 "adjusting dtor exception specs was introduced in c++11"); 8707 8708 // C++11 [class.dtor]p3: 8709 // A declaration of a destructor that does not have an exception- 8710 // specification is implicitly considered to have the same exception- 8711 // specification as an implicit declaration. 8712 const FunctionProtoType *DtorType = Destructor->getType()-> 8713 getAs<FunctionProtoType>(); 8714 if (DtorType->hasExceptionSpec()) 8715 return; 8716 8717 // Replace the destructor's type, building off the existing one. Fortunately, 8718 // the only thing of interest in the destructor type is its extended info. 8719 // The return and arguments are fixed. 8720 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8721 EPI.ExceptionSpecType = EST_Unevaluated; 8722 EPI.ExceptionSpecDecl = Destructor; 8723 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8724 8725 // FIXME: If the destructor has a body that could throw, and the newly created 8726 // spec doesn't allow exceptions, we should emit a warning, because this 8727 // change in behavior can break conforming C++03 programs at runtime. 8728 // However, we don't have a body or an exception specification yet, so it 8729 // needs to be done somewhere else. 8730} 8731 8732namespace { 8733/// \brief An abstract base class for all helper classes used in building the 8734// copy/move operators. These classes serve as factory functions and help us 8735// avoid using the same Expr* in the AST twice. 8736class ExprBuilder { 8737 ExprBuilder(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8738 ExprBuilder &operator=(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8739 8740protected: 8741 static Expr *assertNotNull(Expr *E) { 8742 assert(E && "Expression construction must not fail."); 8743 return E; 8744 } 8745 8746public: 8747 ExprBuilder() {} 8748 virtual ~ExprBuilder() {} 8749 8750 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; 8751}; 8752 8753class RefBuilder: public ExprBuilder { 8754 VarDecl *Var; 8755 QualType VarType; 8756 8757public: 8758 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8759 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).take()); 8760 } 8761 8762 RefBuilder(VarDecl *Var, QualType VarType) 8763 : Var(Var), VarType(VarType) {} 8764}; 8765 8766class ThisBuilder: public ExprBuilder { 8767public: 8768 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8769 return assertNotNull(S.ActOnCXXThis(Loc).takeAs<Expr>()); 8770 } 8771}; 8772 8773class CastBuilder: public ExprBuilder { 8774 const ExprBuilder &Builder; 8775 QualType Type; 8776 ExprValueKind Kind; 8777 const CXXCastPath &Path; 8778 8779public: 8780 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8781 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, 8782 CK_UncheckedDerivedToBase, Kind, 8783 &Path).take()); 8784 } 8785 8786 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, 8787 const CXXCastPath &Path) 8788 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} 8789}; 8790 8791class DerefBuilder: public ExprBuilder { 8792 const ExprBuilder &Builder; 8793 8794public: 8795 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8796 return assertNotNull( 8797 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).take()); 8798 } 8799 8800 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8801}; 8802 8803class MemberBuilder: public ExprBuilder { 8804 const ExprBuilder &Builder; 8805 QualType Type; 8806 CXXScopeSpec SS; 8807 bool IsArrow; 8808 LookupResult &MemberLookup; 8809 8810public: 8811 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8812 return assertNotNull(S.BuildMemberReferenceExpr( 8813 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), 0, 8814 MemberLookup, 0).take()); 8815 } 8816 8817 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, 8818 LookupResult &MemberLookup) 8819 : Builder(Builder), Type(Type), IsArrow(IsArrow), 8820 MemberLookup(MemberLookup) {} 8821}; 8822 8823class MoveCastBuilder: public ExprBuilder { 8824 const ExprBuilder &Builder; 8825 8826public: 8827 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8828 return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); 8829 } 8830 8831 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8832}; 8833 8834class LvalueConvBuilder: public ExprBuilder { 8835 const ExprBuilder &Builder; 8836 8837public: 8838 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8839 return assertNotNull( 8840 S.DefaultLvalueConversion(Builder.build(S, Loc)).take()); 8841 } 8842 8843 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8844}; 8845 8846class SubscriptBuilder: public ExprBuilder { 8847 const ExprBuilder &Base; 8848 const ExprBuilder &Index; 8849 8850public: 8851 virtual Expr *build(Sema &S, SourceLocation Loc) const 8852 LLVM_OVERRIDE { 8853 return assertNotNull(S.CreateBuiltinArraySubscriptExpr( 8854 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).take()); 8855 } 8856 8857 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) 8858 : Base(Base), Index(Index) {} 8859}; 8860 8861} // end anonymous namespace 8862 8863/// When generating a defaulted copy or move assignment operator, if a field 8864/// should be copied with __builtin_memcpy rather than via explicit assignments, 8865/// do so. This optimization only applies for arrays of scalars, and for arrays 8866/// of class type where the selected copy/move-assignment operator is trivial. 8867static StmtResult 8868buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8869 const ExprBuilder &ToB, const ExprBuilder &FromB) { 8870 // Compute the size of the memory buffer to be copied. 8871 QualType SizeType = S.Context.getSizeType(); 8872 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8873 S.Context.getTypeSizeInChars(T).getQuantity()); 8874 8875 // Take the address of the field references for "from" and "to". We 8876 // directly construct UnaryOperators here because semantic analysis 8877 // does not permit us to take the address of an xvalue. 8878 Expr *From = FromB.build(S, Loc); 8879 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8880 S.Context.getPointerType(From->getType()), 8881 VK_RValue, OK_Ordinary, Loc); 8882 Expr *To = ToB.build(S, Loc); 8883 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8884 S.Context.getPointerType(To->getType()), 8885 VK_RValue, OK_Ordinary, Loc); 8886 8887 const Type *E = T->getBaseElementTypeUnsafe(); 8888 bool NeedsCollectableMemCpy = 8889 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8890 8891 // Create a reference to the __builtin_objc_memmove_collectable function 8892 StringRef MemCpyName = NeedsCollectableMemCpy ? 8893 "__builtin_objc_memmove_collectable" : 8894 "__builtin_memcpy"; 8895 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8896 Sema::LookupOrdinaryName); 8897 S.LookupName(R, S.TUScope, true); 8898 8899 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8900 if (!MemCpy) 8901 // Something went horribly wrong earlier, and we will have complained 8902 // about it. 8903 return StmtError(); 8904 8905 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8906 VK_RValue, Loc, 0); 8907 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8908 8909 Expr *CallArgs[] = { 8910 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8911 }; 8912 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8913 Loc, CallArgs, Loc); 8914 8915 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8916 return S.Owned(Call.takeAs<Stmt>()); 8917} 8918 8919/// \brief Builds a statement that copies/moves the given entity from \p From to 8920/// \c To. 8921/// 8922/// This routine is used to copy/move the members of a class with an 8923/// implicitly-declared copy/move assignment operator. When the entities being 8924/// copied are arrays, this routine builds for loops to copy them. 8925/// 8926/// \param S The Sema object used for type-checking. 8927/// 8928/// \param Loc The location where the implicit copy/move is being generated. 8929/// 8930/// \param T The type of the expressions being copied/moved. Both expressions 8931/// must have this type. 8932/// 8933/// \param To The expression we are copying/moving to. 8934/// 8935/// \param From The expression we are copying/moving from. 8936/// 8937/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8938/// Otherwise, it's a non-static member subobject. 8939/// 8940/// \param Copying Whether we're copying or moving. 8941/// 8942/// \param Depth Internal parameter recording the depth of the recursion. 8943/// 8944/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8945/// if a memcpy should be used instead. 8946static StmtResult 8947buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8948 const ExprBuilder &To, const ExprBuilder &From, 8949 bool CopyingBaseSubobject, bool Copying, 8950 unsigned Depth = 0) { 8951 // C++11 [class.copy]p28: 8952 // Each subobject is assigned in the manner appropriate to its type: 8953 // 8954 // - if the subobject is of class type, as if by a call to operator= with 8955 // the subobject as the object expression and the corresponding 8956 // subobject of x as a single function argument (as if by explicit 8957 // qualification; that is, ignoring any possible virtual overriding 8958 // functions in more derived classes); 8959 // 8960 // C++03 [class.copy]p13: 8961 // - if the subobject is of class type, the copy assignment operator for 8962 // the class is used (as if by explicit qualification; that is, 8963 // ignoring any possible virtual overriding functions in more derived 8964 // classes); 8965 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8966 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8967 8968 // Look for operator=. 8969 DeclarationName Name 8970 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8971 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8972 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8973 8974 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8975 // operator. 8976 if (!S.getLangOpts().CPlusPlus11) { 8977 LookupResult::Filter F = OpLookup.makeFilter(); 8978 while (F.hasNext()) { 8979 NamedDecl *D = F.next(); 8980 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8981 if (Method->isCopyAssignmentOperator() || 8982 (!Copying && Method->isMoveAssignmentOperator())) 8983 continue; 8984 8985 F.erase(); 8986 } 8987 F.done(); 8988 } 8989 8990 // Suppress the protected check (C++ [class.protected]) for each of the 8991 // assignment operators we found. This strange dance is required when 8992 // we're assigning via a base classes's copy-assignment operator. To 8993 // ensure that we're getting the right base class subobject (without 8994 // ambiguities), we need to cast "this" to that subobject type; to 8995 // ensure that we don't go through the virtual call mechanism, we need 8996 // to qualify the operator= name with the base class (see below). However, 8997 // this means that if the base class has a protected copy assignment 8998 // operator, the protected member access check will fail. So, we 8999 // rewrite "protected" access to "public" access in this case, since we 9000 // know by construction that we're calling from a derived class. 9001 if (CopyingBaseSubobject) { 9002 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 9003 L != LEnd; ++L) { 9004 if (L.getAccess() == AS_protected) 9005 L.setAccess(AS_public); 9006 } 9007 } 9008 9009 // Create the nested-name-specifier that will be used to qualify the 9010 // reference to operator=; this is required to suppress the virtual 9011 // call mechanism. 9012 CXXScopeSpec SS; 9013 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 9014 SS.MakeTrivial(S.Context, 9015 NestedNameSpecifier::Create(S.Context, 0, false, 9016 CanonicalT), 9017 Loc); 9018 9019 // Create the reference to operator=. 9020 ExprResult OpEqualRef 9021 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false, 9022 SS, /*TemplateKWLoc=*/SourceLocation(), 9023 /*FirstQualifierInScope=*/0, 9024 OpLookup, 9025 /*TemplateArgs=*/0, 9026 /*SuppressQualifierCheck=*/true); 9027 if (OpEqualRef.isInvalid()) 9028 return StmtError(); 9029 9030 // Build the call to the assignment operator. 9031 9032 Expr *FromInst = From.build(S, Loc); 9033 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 9034 OpEqualRef.takeAs<Expr>(), 9035 Loc, FromInst, Loc); 9036 if (Call.isInvalid()) 9037 return StmtError(); 9038 9039 // If we built a call to a trivial 'operator=' while copying an array, 9040 // bail out. We'll replace the whole shebang with a memcpy. 9041 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 9042 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 9043 return StmtResult((Stmt*)0); 9044 9045 // Convert to an expression-statement, and clean up any produced 9046 // temporaries. 9047 return S.ActOnExprStmt(Call); 9048 } 9049 9050 // - if the subobject is of scalar type, the built-in assignment 9051 // operator is used. 9052 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 9053 if (!ArrayTy) { 9054 ExprResult Assignment = S.CreateBuiltinBinOp( 9055 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); 9056 if (Assignment.isInvalid()) 9057 return StmtError(); 9058 return S.ActOnExprStmt(Assignment); 9059 } 9060 9061 // - if the subobject is an array, each element is assigned, in the 9062 // manner appropriate to the element type; 9063 9064 // Construct a loop over the array bounds, e.g., 9065 // 9066 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 9067 // 9068 // that will copy each of the array elements. 9069 QualType SizeType = S.Context.getSizeType(); 9070 9071 // Create the iteration variable. 9072 IdentifierInfo *IterationVarName = 0; 9073 { 9074 SmallString<8> Str; 9075 llvm::raw_svector_ostream OS(Str); 9076 OS << "__i" << Depth; 9077 IterationVarName = &S.Context.Idents.get(OS.str()); 9078 } 9079 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 9080 IterationVarName, SizeType, 9081 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 9082 SC_None); 9083 9084 // Initialize the iteration variable to zero. 9085 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 9086 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 9087 9088 // Creates a reference to the iteration variable. 9089 RefBuilder IterationVarRef(IterationVar, SizeType); 9090 LvalueConvBuilder IterationVarRefRVal(IterationVarRef); 9091 9092 // Create the DeclStmt that holds the iteration variable. 9093 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 9094 9095 // Subscript the "from" and "to" expressions with the iteration variable. 9096 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); 9097 MoveCastBuilder FromIndexMove(FromIndexCopy); 9098 const ExprBuilder *FromIndex; 9099 if (Copying) 9100 FromIndex = &FromIndexCopy; 9101 else 9102 FromIndex = &FromIndexMove; 9103 9104 SubscriptBuilder ToIndex(To, IterationVarRefRVal); 9105 9106 // Build the copy/move for an individual element of the array. 9107 StmtResult Copy = 9108 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 9109 ToIndex, *FromIndex, CopyingBaseSubobject, 9110 Copying, Depth + 1); 9111 // Bail out if copying fails or if we determined that we should use memcpy. 9112 if (Copy.isInvalid() || !Copy.get()) 9113 return Copy; 9114 9115 // Create the comparison against the array bound. 9116 llvm::APInt Upper 9117 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 9118 Expr *Comparison 9119 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc), 9120 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 9121 BO_NE, S.Context.BoolTy, 9122 VK_RValue, OK_Ordinary, Loc, false); 9123 9124 // Create the pre-increment of the iteration variable. 9125 Expr *Increment 9126 = new (S.Context) UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, 9127 SizeType, VK_LValue, OK_Ordinary, Loc); 9128 9129 // Construct the loop that copies all elements of this array. 9130 return S.ActOnForStmt(Loc, Loc, InitStmt, 9131 S.MakeFullExpr(Comparison), 9132 0, S.MakeFullDiscardedValueExpr(Increment), 9133 Loc, Copy.take()); 9134} 9135 9136static StmtResult 9137buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 9138 const ExprBuilder &To, const ExprBuilder &From, 9139 bool CopyingBaseSubobject, bool Copying) { 9140 // Maybe we should use a memcpy? 9141 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 9142 T.isTriviallyCopyableType(S.Context)) 9143 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 9144 9145 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 9146 CopyingBaseSubobject, 9147 Copying, 0)); 9148 9149 // If we ended up picking a trivial assignment operator for an array of a 9150 // non-trivially-copyable class type, just emit a memcpy. 9151 if (!Result.isInvalid() && !Result.get()) 9152 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 9153 9154 return Result; 9155} 9156 9157Sema::ImplicitExceptionSpecification 9158Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 9159 CXXRecordDecl *ClassDecl = MD->getParent(); 9160 9161 ImplicitExceptionSpecification ExceptSpec(*this); 9162 if (ClassDecl->isInvalidDecl()) 9163 return ExceptSpec; 9164 9165 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9166 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 9167 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9168 9169 // C++ [except.spec]p14: 9170 // An implicitly declared special member function (Clause 12) shall have an 9171 // exception-specification. [...] 9172 9173 // It is unspecified whether or not an implicit copy assignment operator 9174 // attempts to deduplicate calls to assignment operators of virtual bases are 9175 // made. As such, this exception specification is effectively unspecified. 9176 // Based on a similar decision made for constness in C++0x, we're erring on 9177 // the side of assuming such calls to be made regardless of whether they 9178 // actually happen. 9179 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9180 BaseEnd = ClassDecl->bases_end(); 9181 Base != BaseEnd; ++Base) { 9182 if (Base->isVirtual()) 9183 continue; 9184 9185 CXXRecordDecl *BaseClassDecl 9186 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9187 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9188 ArgQuals, false, 0)) 9189 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9190 } 9191 9192 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9193 BaseEnd = ClassDecl->vbases_end(); 9194 Base != BaseEnd; ++Base) { 9195 CXXRecordDecl *BaseClassDecl 9196 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9197 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9198 ArgQuals, false, 0)) 9199 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9200 } 9201 9202 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9203 FieldEnd = ClassDecl->field_end(); 9204 Field != FieldEnd; 9205 ++Field) { 9206 QualType FieldType = Context.getBaseElementType(Field->getType()); 9207 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9208 if (CXXMethodDecl *CopyAssign = 9209 LookupCopyingAssignment(FieldClassDecl, 9210 ArgQuals | FieldType.getCVRQualifiers(), 9211 false, 0)) 9212 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 9213 } 9214 } 9215 9216 return ExceptSpec; 9217} 9218 9219CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 9220 // Note: The following rules are largely analoguous to the copy 9221 // constructor rules. Note that virtual bases are not taken into account 9222 // for determining the argument type of the operator. Note also that 9223 // operators taking an object instead of a reference are allowed. 9224 assert(ClassDecl->needsImplicitCopyAssignment()); 9225 9226 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 9227 if (DSM.isAlreadyBeingDeclared()) 9228 return 0; 9229 9230 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9231 QualType RetType = Context.getLValueReferenceType(ArgType); 9232 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 9233 if (Const) 9234 ArgType = ArgType.withConst(); 9235 ArgType = Context.getLValueReferenceType(ArgType); 9236 9237 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9238 CXXCopyAssignment, 9239 Const); 9240 9241 // An implicitly-declared copy assignment operator is an inline public 9242 // member of its class. 9243 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9244 SourceLocation ClassLoc = ClassDecl->getLocation(); 9245 DeclarationNameInfo NameInfo(Name, ClassLoc); 9246 CXXMethodDecl *CopyAssignment = 9247 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9248 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 9249 /*isInline=*/ true, Constexpr, SourceLocation()); 9250 CopyAssignment->setAccess(AS_public); 9251 CopyAssignment->setDefaulted(); 9252 CopyAssignment->setImplicit(); 9253 9254 // Build an exception specification pointing back at this member. 9255 FunctionProtoType::ExtProtoInfo EPI = 9256 getImplicitMethodEPI(*this, CopyAssignment); 9257 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9258 9259 // Add the parameter to the operator. 9260 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 9261 ClassLoc, ClassLoc, /*Id=*/0, 9262 ArgType, /*TInfo=*/0, 9263 SC_None, 0); 9264 CopyAssignment->setParams(FromParam); 9265 9266 AddOverriddenMethods(ClassDecl, CopyAssignment); 9267 9268 CopyAssignment->setTrivial( 9269 ClassDecl->needsOverloadResolutionForCopyAssignment() 9270 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 9271 : ClassDecl->hasTrivialCopyAssignment()); 9272 9273 // C++11 [class.copy]p19: 9274 // .... If the class definition does not explicitly declare a copy 9275 // assignment operator, there is no user-declared move constructor, and 9276 // there is no user-declared move assignment operator, a copy assignment 9277 // operator is implicitly declared as defaulted. 9278 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 9279 SetDeclDeleted(CopyAssignment, ClassLoc); 9280 9281 // Note that we have added this copy-assignment operator. 9282 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 9283 9284 if (Scope *S = getScopeForContext(ClassDecl)) 9285 PushOnScopeChains(CopyAssignment, S, false); 9286 ClassDecl->addDecl(CopyAssignment); 9287 9288 return CopyAssignment; 9289} 9290 9291/// Diagnose an implicit copy operation for a class which is odr-used, but 9292/// which is deprecated because the class has a user-declared copy constructor, 9293/// copy assignment operator, or destructor. 9294static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 9295 SourceLocation UseLoc) { 9296 assert(CopyOp->isImplicit()); 9297 9298 CXXRecordDecl *RD = CopyOp->getParent(); 9299 CXXMethodDecl *UserDeclaredOperation = 0; 9300 9301 // In Microsoft mode, assignment operations don't affect constructors and 9302 // vice versa. 9303 if (RD->hasUserDeclaredDestructor()) { 9304 UserDeclaredOperation = RD->getDestructor(); 9305 } else if (!isa<CXXConstructorDecl>(CopyOp) && 9306 RD->hasUserDeclaredCopyConstructor() && 9307 !S.getLangOpts().MicrosoftMode) { 9308 // Find any user-declared copy constructor. 9309 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 9310 E = RD->ctor_end(); I != E; ++I) { 9311 if (I->isCopyConstructor()) { 9312 UserDeclaredOperation = *I; 9313 break; 9314 } 9315 } 9316 assert(UserDeclaredOperation); 9317 } else if (isa<CXXConstructorDecl>(CopyOp) && 9318 RD->hasUserDeclaredCopyAssignment() && 9319 !S.getLangOpts().MicrosoftMode) { 9320 // Find any user-declared move assignment operator. 9321 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 9322 E = RD->method_end(); I != E; ++I) { 9323 if (I->isCopyAssignmentOperator()) { 9324 UserDeclaredOperation = *I; 9325 break; 9326 } 9327 } 9328 assert(UserDeclaredOperation); 9329 } 9330 9331 if (UserDeclaredOperation) { 9332 S.Diag(UserDeclaredOperation->getLocation(), 9333 diag::warn_deprecated_copy_operation) 9334 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 9335 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 9336 S.Diag(UseLoc, diag::note_member_synthesized_at) 9337 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 9338 : Sema::CXXCopyAssignment) 9339 << RD; 9340 } 9341} 9342 9343void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 9344 CXXMethodDecl *CopyAssignOperator) { 9345 assert((CopyAssignOperator->isDefaulted() && 9346 CopyAssignOperator->isOverloadedOperator() && 9347 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 9348 !CopyAssignOperator->doesThisDeclarationHaveABody() && 9349 !CopyAssignOperator->isDeleted()) && 9350 "DefineImplicitCopyAssignment called for wrong function"); 9351 9352 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 9353 9354 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 9355 CopyAssignOperator->setInvalidDecl(); 9356 return; 9357 } 9358 9359 // C++11 [class.copy]p18: 9360 // The [definition of an implicitly declared copy assignment operator] is 9361 // deprecated if the class has a user-declared copy constructor or a 9362 // user-declared destructor. 9363 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 9364 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 9365 9366 CopyAssignOperator->markUsed(Context); 9367 9368 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 9369 DiagnosticErrorTrap Trap(Diags); 9370 9371 // C++0x [class.copy]p30: 9372 // The implicitly-defined or explicitly-defaulted copy assignment operator 9373 // for a non-union class X performs memberwise copy assignment of its 9374 // subobjects. The direct base classes of X are assigned first, in the 9375 // order of their declaration in the base-specifier-list, and then the 9376 // immediate non-static data members of X are assigned, in the order in 9377 // which they were declared in the class definition. 9378 9379 // The statements that form the synthesized function body. 9380 SmallVector<Stmt*, 8> Statements; 9381 9382 // The parameter for the "other" object, which we are copying from. 9383 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 9384 Qualifiers OtherQuals = Other->getType().getQualifiers(); 9385 QualType OtherRefType = Other->getType(); 9386 if (const LValueReferenceType *OtherRef 9387 = OtherRefType->getAs<LValueReferenceType>()) { 9388 OtherRefType = OtherRef->getPointeeType(); 9389 OtherQuals = OtherRefType.getQualifiers(); 9390 } 9391 9392 // Our location for everything implicitly-generated. 9393 SourceLocation Loc = CopyAssignOperator->getLocation(); 9394 9395 // Builds a DeclRefExpr for the "other" object. 9396 RefBuilder OtherRef(Other, OtherRefType); 9397 9398 // Builds the "this" pointer. 9399 ThisBuilder This; 9400 9401 // Assign base classes. 9402 bool Invalid = false; 9403 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9404 E = ClassDecl->bases_end(); Base != E; ++Base) { 9405 // Form the assignment: 9406 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 9407 QualType BaseType = Base->getType().getUnqualifiedType(); 9408 if (!BaseType->isRecordType()) { 9409 Invalid = true; 9410 continue; 9411 } 9412 9413 CXXCastPath BasePath; 9414 BasePath.push_back(Base); 9415 9416 // Construct the "from" expression, which is an implicit cast to the 9417 // appropriately-qualified base type. 9418 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), 9419 VK_LValue, BasePath); 9420 9421 // Dereference "this". 9422 DerefBuilder DerefThis(This); 9423 CastBuilder To(DerefThis, 9424 Context.getCVRQualifiedType( 9425 BaseType, CopyAssignOperator->getTypeQualifiers()), 9426 VK_LValue, BasePath); 9427 9428 // Build the copy. 9429 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 9430 To, From, 9431 /*CopyingBaseSubobject=*/true, 9432 /*Copying=*/true); 9433 if (Copy.isInvalid()) { 9434 Diag(CurrentLocation, diag::note_member_synthesized_at) 9435 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9436 CopyAssignOperator->setInvalidDecl(); 9437 return; 9438 } 9439 9440 // Success! Record the copy. 9441 Statements.push_back(Copy.takeAs<Expr>()); 9442 } 9443 9444 // Assign non-static members. 9445 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9446 FieldEnd = ClassDecl->field_end(); 9447 Field != FieldEnd; ++Field) { 9448 if (Field->isUnnamedBitfield()) 9449 continue; 9450 9451 if (Field->isInvalidDecl()) { 9452 Invalid = true; 9453 continue; 9454 } 9455 9456 // Check for members of reference type; we can't copy those. 9457 if (Field->getType()->isReferenceType()) { 9458 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9459 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9460 Diag(Field->getLocation(), diag::note_declared_at); 9461 Diag(CurrentLocation, diag::note_member_synthesized_at) 9462 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9463 Invalid = true; 9464 continue; 9465 } 9466 9467 // Check for members of const-qualified, non-class type. 9468 QualType BaseType = Context.getBaseElementType(Field->getType()); 9469 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9470 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9471 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9472 Diag(Field->getLocation(), diag::note_declared_at); 9473 Diag(CurrentLocation, diag::note_member_synthesized_at) 9474 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9475 Invalid = true; 9476 continue; 9477 } 9478 9479 // Suppress assigning zero-width bitfields. 9480 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9481 continue; 9482 9483 QualType FieldType = Field->getType().getNonReferenceType(); 9484 if (FieldType->isIncompleteArrayType()) { 9485 assert(ClassDecl->hasFlexibleArrayMember() && 9486 "Incomplete array type is not valid"); 9487 continue; 9488 } 9489 9490 // Build references to the field in the object we're copying from and to. 9491 CXXScopeSpec SS; // Intentionally empty 9492 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9493 LookupMemberName); 9494 MemberLookup.addDecl(*Field); 9495 MemberLookup.resolveKind(); 9496 9497 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); 9498 9499 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); 9500 9501 // Build the copy of this field. 9502 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9503 To, From, 9504 /*CopyingBaseSubobject=*/false, 9505 /*Copying=*/true); 9506 if (Copy.isInvalid()) { 9507 Diag(CurrentLocation, diag::note_member_synthesized_at) 9508 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9509 CopyAssignOperator->setInvalidDecl(); 9510 return; 9511 } 9512 9513 // Success! Record the copy. 9514 Statements.push_back(Copy.takeAs<Stmt>()); 9515 } 9516 9517 if (!Invalid) { 9518 // Add a "return *this;" 9519 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9520 9521 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9522 if (Return.isInvalid()) 9523 Invalid = true; 9524 else { 9525 Statements.push_back(Return.takeAs<Stmt>()); 9526 9527 if (Trap.hasErrorOccurred()) { 9528 Diag(CurrentLocation, diag::note_member_synthesized_at) 9529 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9530 Invalid = true; 9531 } 9532 } 9533 } 9534 9535 if (Invalid) { 9536 CopyAssignOperator->setInvalidDecl(); 9537 return; 9538 } 9539 9540 StmtResult Body; 9541 { 9542 CompoundScopeRAII CompoundScope(*this); 9543 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9544 /*isStmtExpr=*/false); 9545 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9546 } 9547 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9548 9549 if (ASTMutationListener *L = getASTMutationListener()) { 9550 L->CompletedImplicitDefinition(CopyAssignOperator); 9551 } 9552} 9553 9554Sema::ImplicitExceptionSpecification 9555Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9556 CXXRecordDecl *ClassDecl = MD->getParent(); 9557 9558 ImplicitExceptionSpecification ExceptSpec(*this); 9559 if (ClassDecl->isInvalidDecl()) 9560 return ExceptSpec; 9561 9562 // C++0x [except.spec]p14: 9563 // An implicitly declared special member function (Clause 12) shall have an 9564 // exception-specification. [...] 9565 9566 // It is unspecified whether or not an implicit move assignment operator 9567 // attempts to deduplicate calls to assignment operators of virtual bases are 9568 // made. As such, this exception specification is effectively unspecified. 9569 // Based on a similar decision made for constness in C++0x, we're erring on 9570 // the side of assuming such calls to be made regardless of whether they 9571 // actually happen. 9572 // Note that a move constructor is not implicitly declared when there are 9573 // virtual bases, but it can still be user-declared and explicitly defaulted. 9574 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9575 BaseEnd = ClassDecl->bases_end(); 9576 Base != BaseEnd; ++Base) { 9577 if (Base->isVirtual()) 9578 continue; 9579 9580 CXXRecordDecl *BaseClassDecl 9581 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9582 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9583 0, false, 0)) 9584 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9585 } 9586 9587 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9588 BaseEnd = ClassDecl->vbases_end(); 9589 Base != BaseEnd; ++Base) { 9590 CXXRecordDecl *BaseClassDecl 9591 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9592 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9593 0, false, 0)) 9594 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9595 } 9596 9597 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9598 FieldEnd = ClassDecl->field_end(); 9599 Field != FieldEnd; 9600 ++Field) { 9601 QualType FieldType = Context.getBaseElementType(Field->getType()); 9602 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9603 if (CXXMethodDecl *MoveAssign = 9604 LookupMovingAssignment(FieldClassDecl, 9605 FieldType.getCVRQualifiers(), 9606 false, 0)) 9607 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9608 } 9609 } 9610 9611 return ExceptSpec; 9612} 9613 9614/// Determine whether the class type has any direct or indirect virtual base 9615/// classes which have a non-trivial move assignment operator. 9616static bool 9617hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9618 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9619 BaseEnd = ClassDecl->vbases_end(); 9620 Base != BaseEnd; ++Base) { 9621 CXXRecordDecl *BaseClass = 9622 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9623 9624 // Try to declare the move assignment. If it would be deleted, then the 9625 // class does not have a non-trivial move assignment. 9626 if (BaseClass->needsImplicitMoveAssignment()) 9627 S.DeclareImplicitMoveAssignment(BaseClass); 9628 9629 if (BaseClass->hasNonTrivialMoveAssignment()) 9630 return true; 9631 } 9632 9633 return false; 9634} 9635 9636/// Determine whether the given type either has a move constructor or is 9637/// trivially copyable. 9638static bool 9639hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9640 Type = S.Context.getBaseElementType(Type); 9641 9642 // FIXME: Technically, non-trivially-copyable non-class types, such as 9643 // reference types, are supposed to return false here, but that appears 9644 // to be a standard defect. 9645 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9646 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9647 return true; 9648 9649 if (Type.isTriviallyCopyableType(S.Context)) 9650 return true; 9651 9652 if (IsConstructor) { 9653 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9654 // give the right answer. 9655 if (ClassDecl->needsImplicitMoveConstructor()) 9656 S.DeclareImplicitMoveConstructor(ClassDecl); 9657 return ClassDecl->hasMoveConstructor(); 9658 } 9659 9660 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9661 // give the right answer. 9662 if (ClassDecl->needsImplicitMoveAssignment()) 9663 S.DeclareImplicitMoveAssignment(ClassDecl); 9664 return ClassDecl->hasMoveAssignment(); 9665} 9666 9667/// Determine whether all non-static data members and direct or virtual bases 9668/// of class \p ClassDecl have either a move operation, or are trivially 9669/// copyable. 9670static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9671 bool IsConstructor) { 9672 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9673 BaseEnd = ClassDecl->bases_end(); 9674 Base != BaseEnd; ++Base) { 9675 if (Base->isVirtual()) 9676 continue; 9677 9678 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9679 return false; 9680 } 9681 9682 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9683 BaseEnd = ClassDecl->vbases_end(); 9684 Base != BaseEnd; ++Base) { 9685 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9686 return false; 9687 } 9688 9689 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9690 FieldEnd = ClassDecl->field_end(); 9691 Field != FieldEnd; ++Field) { 9692 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9693 return false; 9694 } 9695 9696 return true; 9697} 9698 9699CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9700 // C++11 [class.copy]p20: 9701 // If the definition of a class X does not explicitly declare a move 9702 // assignment operator, one will be implicitly declared as defaulted 9703 // if and only if: 9704 // 9705 // - [first 4 bullets] 9706 assert(ClassDecl->needsImplicitMoveAssignment()); 9707 9708 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9709 if (DSM.isAlreadyBeingDeclared()) 9710 return 0; 9711 9712 // [Checked after we build the declaration] 9713 // - the move assignment operator would not be implicitly defined as 9714 // deleted, 9715 9716 // [DR1402]: 9717 // - X has no direct or indirect virtual base class with a non-trivial 9718 // move assignment operator, and 9719 // - each of X's non-static data members and direct or virtual base classes 9720 // has a type that either has a move assignment operator or is trivially 9721 // copyable. 9722 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9723 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9724 ClassDecl->setFailedImplicitMoveAssignment(); 9725 return 0; 9726 } 9727 9728 // Note: The following rules are largely analoguous to the move 9729 // constructor rules. 9730 9731 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9732 QualType RetType = Context.getLValueReferenceType(ArgType); 9733 ArgType = Context.getRValueReferenceType(ArgType); 9734 9735 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9736 CXXMoveAssignment, 9737 false); 9738 9739 // An implicitly-declared move assignment operator is an inline public 9740 // member of its class. 9741 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9742 SourceLocation ClassLoc = ClassDecl->getLocation(); 9743 DeclarationNameInfo NameInfo(Name, ClassLoc); 9744 CXXMethodDecl *MoveAssignment = 9745 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9746 /*TInfo=*/0, /*StorageClass=*/SC_None, 9747 /*isInline=*/true, Constexpr, SourceLocation()); 9748 MoveAssignment->setAccess(AS_public); 9749 MoveAssignment->setDefaulted(); 9750 MoveAssignment->setImplicit(); 9751 9752 // Build an exception specification pointing back at this member. 9753 FunctionProtoType::ExtProtoInfo EPI = 9754 getImplicitMethodEPI(*this, MoveAssignment); 9755 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9756 9757 // Add the parameter to the operator. 9758 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9759 ClassLoc, ClassLoc, /*Id=*/0, 9760 ArgType, /*TInfo=*/0, 9761 SC_None, 0); 9762 MoveAssignment->setParams(FromParam); 9763 9764 AddOverriddenMethods(ClassDecl, MoveAssignment); 9765 9766 MoveAssignment->setTrivial( 9767 ClassDecl->needsOverloadResolutionForMoveAssignment() 9768 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9769 : ClassDecl->hasTrivialMoveAssignment()); 9770 9771 // C++0x [class.copy]p9: 9772 // If the definition of a class X does not explicitly declare a move 9773 // assignment operator, one will be implicitly declared as defaulted if and 9774 // only if: 9775 // [...] 9776 // - the move assignment operator would not be implicitly defined as 9777 // deleted. 9778 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9779 // Cache this result so that we don't try to generate this over and over 9780 // on every lookup, leaking memory and wasting time. 9781 ClassDecl->setFailedImplicitMoveAssignment(); 9782 return 0; 9783 } 9784 9785 // Note that we have added this copy-assignment operator. 9786 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9787 9788 if (Scope *S = getScopeForContext(ClassDecl)) 9789 PushOnScopeChains(MoveAssignment, S, false); 9790 ClassDecl->addDecl(MoveAssignment); 9791 9792 return MoveAssignment; 9793} 9794 9795void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9796 CXXMethodDecl *MoveAssignOperator) { 9797 assert((MoveAssignOperator->isDefaulted() && 9798 MoveAssignOperator->isOverloadedOperator() && 9799 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9800 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9801 !MoveAssignOperator->isDeleted()) && 9802 "DefineImplicitMoveAssignment called for wrong function"); 9803 9804 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9805 9806 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9807 MoveAssignOperator->setInvalidDecl(); 9808 return; 9809 } 9810 9811 MoveAssignOperator->markUsed(Context); 9812 9813 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9814 DiagnosticErrorTrap Trap(Diags); 9815 9816 // C++0x [class.copy]p28: 9817 // The implicitly-defined or move assignment operator for a non-union class 9818 // X performs memberwise move assignment of its subobjects. The direct base 9819 // classes of X are assigned first, in the order of their declaration in the 9820 // base-specifier-list, and then the immediate non-static data members of X 9821 // are assigned, in the order in which they were declared in the class 9822 // definition. 9823 9824 // The statements that form the synthesized function body. 9825 SmallVector<Stmt*, 8> Statements; 9826 9827 // The parameter for the "other" object, which we are move from. 9828 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9829 QualType OtherRefType = Other->getType()-> 9830 getAs<RValueReferenceType>()->getPointeeType(); 9831 assert(!OtherRefType.getQualifiers() && 9832 "Bad argument type of defaulted move assignment"); 9833 9834 // Our location for everything implicitly-generated. 9835 SourceLocation Loc = MoveAssignOperator->getLocation(); 9836 9837 // Builds a reference to the "other" object. 9838 RefBuilder OtherRef(Other, OtherRefType); 9839 // Cast to rvalue. 9840 MoveCastBuilder MoveOther(OtherRef); 9841 9842 // Builds the "this" pointer. 9843 ThisBuilder This; 9844 9845 // Assign base classes. 9846 bool Invalid = false; 9847 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9848 E = ClassDecl->bases_end(); Base != E; ++Base) { 9849 // Form the assignment: 9850 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9851 QualType BaseType = Base->getType().getUnqualifiedType(); 9852 if (!BaseType->isRecordType()) { 9853 Invalid = true; 9854 continue; 9855 } 9856 9857 CXXCastPath BasePath; 9858 BasePath.push_back(Base); 9859 9860 // Construct the "from" expression, which is an implicit cast to the 9861 // appropriately-qualified base type. 9862 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); 9863 9864 // Dereference "this". 9865 DerefBuilder DerefThis(This); 9866 9867 // Implicitly cast "this" to the appropriately-qualified base type. 9868 CastBuilder To(DerefThis, 9869 Context.getCVRQualifiedType( 9870 BaseType, MoveAssignOperator->getTypeQualifiers()), 9871 VK_LValue, BasePath); 9872 9873 // Build the move. 9874 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9875 To, From, 9876 /*CopyingBaseSubobject=*/true, 9877 /*Copying=*/false); 9878 if (Move.isInvalid()) { 9879 Diag(CurrentLocation, diag::note_member_synthesized_at) 9880 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9881 MoveAssignOperator->setInvalidDecl(); 9882 return; 9883 } 9884 9885 // Success! Record the move. 9886 Statements.push_back(Move.takeAs<Expr>()); 9887 } 9888 9889 // Assign non-static members. 9890 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9891 FieldEnd = ClassDecl->field_end(); 9892 Field != FieldEnd; ++Field) { 9893 if (Field->isUnnamedBitfield()) 9894 continue; 9895 9896 if (Field->isInvalidDecl()) { 9897 Invalid = true; 9898 continue; 9899 } 9900 9901 // Check for members of reference type; we can't move those. 9902 if (Field->getType()->isReferenceType()) { 9903 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9904 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9905 Diag(Field->getLocation(), diag::note_declared_at); 9906 Diag(CurrentLocation, diag::note_member_synthesized_at) 9907 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9908 Invalid = true; 9909 continue; 9910 } 9911 9912 // Check for members of const-qualified, non-class type. 9913 QualType BaseType = Context.getBaseElementType(Field->getType()); 9914 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9915 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9916 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9917 Diag(Field->getLocation(), diag::note_declared_at); 9918 Diag(CurrentLocation, diag::note_member_synthesized_at) 9919 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9920 Invalid = true; 9921 continue; 9922 } 9923 9924 // Suppress assigning zero-width bitfields. 9925 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9926 continue; 9927 9928 QualType FieldType = Field->getType().getNonReferenceType(); 9929 if (FieldType->isIncompleteArrayType()) { 9930 assert(ClassDecl->hasFlexibleArrayMember() && 9931 "Incomplete array type is not valid"); 9932 continue; 9933 } 9934 9935 // Build references to the field in the object we're copying from and to. 9936 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9937 LookupMemberName); 9938 MemberLookup.addDecl(*Field); 9939 MemberLookup.resolveKind(); 9940 MemberBuilder From(MoveOther, OtherRefType, 9941 /*IsArrow=*/false, MemberLookup); 9942 MemberBuilder To(This, getCurrentThisType(), 9943 /*IsArrow=*/true, MemberLookup); 9944 9945 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue 9946 "Member reference with rvalue base must be rvalue except for reference " 9947 "members, which aren't allowed for move assignment."); 9948 9949 // Build the move of this field. 9950 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9951 To, From, 9952 /*CopyingBaseSubobject=*/false, 9953 /*Copying=*/false); 9954 if (Move.isInvalid()) { 9955 Diag(CurrentLocation, diag::note_member_synthesized_at) 9956 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9957 MoveAssignOperator->setInvalidDecl(); 9958 return; 9959 } 9960 9961 // Success! Record the copy. 9962 Statements.push_back(Move.takeAs<Stmt>()); 9963 } 9964 9965 if (!Invalid) { 9966 // Add a "return *this;" 9967 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9968 9969 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9970 if (Return.isInvalid()) 9971 Invalid = true; 9972 else { 9973 Statements.push_back(Return.takeAs<Stmt>()); 9974 9975 if (Trap.hasErrorOccurred()) { 9976 Diag(CurrentLocation, diag::note_member_synthesized_at) 9977 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9978 Invalid = true; 9979 } 9980 } 9981 } 9982 9983 if (Invalid) { 9984 MoveAssignOperator->setInvalidDecl(); 9985 return; 9986 } 9987 9988 StmtResult Body; 9989 { 9990 CompoundScopeRAII CompoundScope(*this); 9991 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9992 /*isStmtExpr=*/false); 9993 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9994 } 9995 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9996 9997 if (ASTMutationListener *L = getASTMutationListener()) { 9998 L->CompletedImplicitDefinition(MoveAssignOperator); 9999 } 10000} 10001 10002Sema::ImplicitExceptionSpecification 10003Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 10004 CXXRecordDecl *ClassDecl = MD->getParent(); 10005 10006 ImplicitExceptionSpecification ExceptSpec(*this); 10007 if (ClassDecl->isInvalidDecl()) 10008 return ExceptSpec; 10009 10010 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 10011 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 10012 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 10013 10014 // C++ [except.spec]p14: 10015 // An implicitly declared special member function (Clause 12) shall have an 10016 // exception-specification. [...] 10017 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 10018 BaseEnd = ClassDecl->bases_end(); 10019 Base != BaseEnd; 10020 ++Base) { 10021 // Virtual bases are handled below. 10022 if (Base->isVirtual()) 10023 continue; 10024 10025 CXXRecordDecl *BaseClassDecl 10026 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 10027 if (CXXConstructorDecl *CopyConstructor = 10028 LookupCopyingConstructor(BaseClassDecl, Quals)) 10029 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 10030 } 10031 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 10032 BaseEnd = ClassDecl->vbases_end(); 10033 Base != BaseEnd; 10034 ++Base) { 10035 CXXRecordDecl *BaseClassDecl 10036 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 10037 if (CXXConstructorDecl *CopyConstructor = 10038 LookupCopyingConstructor(BaseClassDecl, Quals)) 10039 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 10040 } 10041 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 10042 FieldEnd = ClassDecl->field_end(); 10043 Field != FieldEnd; 10044 ++Field) { 10045 QualType FieldType = Context.getBaseElementType(Field->getType()); 10046 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 10047 if (CXXConstructorDecl *CopyConstructor = 10048 LookupCopyingConstructor(FieldClassDecl, 10049 Quals | FieldType.getCVRQualifiers())) 10050 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 10051 } 10052 } 10053 10054 return ExceptSpec; 10055} 10056 10057CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 10058 CXXRecordDecl *ClassDecl) { 10059 // C++ [class.copy]p4: 10060 // If the class definition does not explicitly declare a copy 10061 // constructor, one is declared implicitly. 10062 assert(ClassDecl->needsImplicitCopyConstructor()); 10063 10064 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 10065 if (DSM.isAlreadyBeingDeclared()) 10066 return 0; 10067 10068 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10069 QualType ArgType = ClassType; 10070 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 10071 if (Const) 10072 ArgType = ArgType.withConst(); 10073 ArgType = Context.getLValueReferenceType(ArgType); 10074 10075 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10076 CXXCopyConstructor, 10077 Const); 10078 10079 DeclarationName Name 10080 = Context.DeclarationNames.getCXXConstructorName( 10081 Context.getCanonicalType(ClassType)); 10082 SourceLocation ClassLoc = ClassDecl->getLocation(); 10083 DeclarationNameInfo NameInfo(Name, ClassLoc); 10084 10085 // An implicitly-declared copy constructor is an inline public 10086 // member of its class. 10087 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 10088 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10089 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10090 Constexpr); 10091 CopyConstructor->setAccess(AS_public); 10092 CopyConstructor->setDefaulted(); 10093 10094 // Build an exception specification pointing back at this member. 10095 FunctionProtoType::ExtProtoInfo EPI = 10096 getImplicitMethodEPI(*this, CopyConstructor); 10097 CopyConstructor->setType( 10098 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10099 10100 // Add the parameter to the constructor. 10101 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 10102 ClassLoc, ClassLoc, 10103 /*IdentifierInfo=*/0, 10104 ArgType, /*TInfo=*/0, 10105 SC_None, 0); 10106 CopyConstructor->setParams(FromParam); 10107 10108 CopyConstructor->setTrivial( 10109 ClassDecl->needsOverloadResolutionForCopyConstructor() 10110 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 10111 : ClassDecl->hasTrivialCopyConstructor()); 10112 10113 // C++11 [class.copy]p8: 10114 // ... If the class definition does not explicitly declare a copy 10115 // constructor, there is no user-declared move constructor, and there is no 10116 // user-declared move assignment operator, a copy constructor is implicitly 10117 // declared as defaulted. 10118 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 10119 SetDeclDeleted(CopyConstructor, ClassLoc); 10120 10121 // Note that we have declared this constructor. 10122 ++ASTContext::NumImplicitCopyConstructorsDeclared; 10123 10124 if (Scope *S = getScopeForContext(ClassDecl)) 10125 PushOnScopeChains(CopyConstructor, S, false); 10126 ClassDecl->addDecl(CopyConstructor); 10127 10128 return CopyConstructor; 10129} 10130 10131void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 10132 CXXConstructorDecl *CopyConstructor) { 10133 assert((CopyConstructor->isDefaulted() && 10134 CopyConstructor->isCopyConstructor() && 10135 !CopyConstructor->doesThisDeclarationHaveABody() && 10136 !CopyConstructor->isDeleted()) && 10137 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 10138 10139 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 10140 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 10141 10142 // C++11 [class.copy]p7: 10143 // The [definition of an implicitly declared copy constructor] is 10144 // deprecated if the class has a user-declared copy assignment operator 10145 // or a user-declared destructor. 10146 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 10147 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 10148 10149 SynthesizedFunctionScope Scope(*this, CopyConstructor); 10150 DiagnosticErrorTrap Trap(Diags); 10151 10152 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 10153 Trap.hasErrorOccurred()) { 10154 Diag(CurrentLocation, diag::note_member_synthesized_at) 10155 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 10156 CopyConstructor->setInvalidDecl(); 10157 } else { 10158 Sema::CompoundScopeRAII CompoundScope(*this); 10159 CopyConstructor->setBody(ActOnCompoundStmt( 10160 CopyConstructor->getLocation(), CopyConstructor->getLocation(), None, 10161 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10162 } 10163 10164 CopyConstructor->markUsed(Context); 10165 if (ASTMutationListener *L = getASTMutationListener()) { 10166 L->CompletedImplicitDefinition(CopyConstructor); 10167 } 10168} 10169 10170Sema::ImplicitExceptionSpecification 10171Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 10172 CXXRecordDecl *ClassDecl = MD->getParent(); 10173 10174 // C++ [except.spec]p14: 10175 // An implicitly declared special member function (Clause 12) shall have an 10176 // exception-specification. [...] 10177 ImplicitExceptionSpecification ExceptSpec(*this); 10178 if (ClassDecl->isInvalidDecl()) 10179 return ExceptSpec; 10180 10181 // Direct base-class constructors. 10182 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 10183 BEnd = ClassDecl->bases_end(); 10184 B != BEnd; ++B) { 10185 if (B->isVirtual()) // Handled below. 10186 continue; 10187 10188 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10189 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10190 CXXConstructorDecl *Constructor = 10191 LookupMovingConstructor(BaseClassDecl, 0); 10192 // If this is a deleted function, add it anyway. This might be conformant 10193 // with the standard. This might not. I'm not sure. It might not matter. 10194 if (Constructor) 10195 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10196 } 10197 } 10198 10199 // Virtual base-class constructors. 10200 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 10201 BEnd = ClassDecl->vbases_end(); 10202 B != BEnd; ++B) { 10203 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10204 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10205 CXXConstructorDecl *Constructor = 10206 LookupMovingConstructor(BaseClassDecl, 0); 10207 // If this is a deleted function, add it anyway. This might be conformant 10208 // with the standard. This might not. I'm not sure. It might not matter. 10209 if (Constructor) 10210 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10211 } 10212 } 10213 10214 // Field constructors. 10215 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 10216 FEnd = ClassDecl->field_end(); 10217 F != FEnd; ++F) { 10218 QualType FieldType = Context.getBaseElementType(F->getType()); 10219 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 10220 CXXConstructorDecl *Constructor = 10221 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 10222 // If this is a deleted function, add it anyway. This might be conformant 10223 // with the standard. This might not. I'm not sure. It might not matter. 10224 // In particular, the problem is that this function never gets called. It 10225 // might just be ill-formed because this function attempts to refer to 10226 // a deleted function here. 10227 if (Constructor) 10228 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 10229 } 10230 } 10231 10232 return ExceptSpec; 10233} 10234 10235CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 10236 CXXRecordDecl *ClassDecl) { 10237 // C++11 [class.copy]p9: 10238 // If the definition of a class X does not explicitly declare a move 10239 // constructor, one will be implicitly declared as defaulted if and only if: 10240 // 10241 // - [first 4 bullets] 10242 assert(ClassDecl->needsImplicitMoveConstructor()); 10243 10244 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 10245 if (DSM.isAlreadyBeingDeclared()) 10246 return 0; 10247 10248 // [Checked after we build the declaration] 10249 // - the move assignment operator would not be implicitly defined as 10250 // deleted, 10251 10252 // [DR1402]: 10253 // - each of X's non-static data members and direct or virtual base classes 10254 // has a type that either has a move constructor or is trivially copyable. 10255 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 10256 ClassDecl->setFailedImplicitMoveConstructor(); 10257 return 0; 10258 } 10259 10260 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10261 QualType ArgType = Context.getRValueReferenceType(ClassType); 10262 10263 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10264 CXXMoveConstructor, 10265 false); 10266 10267 DeclarationName Name 10268 = Context.DeclarationNames.getCXXConstructorName( 10269 Context.getCanonicalType(ClassType)); 10270 SourceLocation ClassLoc = ClassDecl->getLocation(); 10271 DeclarationNameInfo NameInfo(Name, ClassLoc); 10272 10273 // C++11 [class.copy]p11: 10274 // An implicitly-declared copy/move constructor is an inline public 10275 // member of its class. 10276 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 10277 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10278 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10279 Constexpr); 10280 MoveConstructor->setAccess(AS_public); 10281 MoveConstructor->setDefaulted(); 10282 10283 // Build an exception specification pointing back at this member. 10284 FunctionProtoType::ExtProtoInfo EPI = 10285 getImplicitMethodEPI(*this, MoveConstructor); 10286 MoveConstructor->setType( 10287 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10288 10289 // Add the parameter to the constructor. 10290 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 10291 ClassLoc, ClassLoc, 10292 /*IdentifierInfo=*/0, 10293 ArgType, /*TInfo=*/0, 10294 SC_None, 0); 10295 MoveConstructor->setParams(FromParam); 10296 10297 MoveConstructor->setTrivial( 10298 ClassDecl->needsOverloadResolutionForMoveConstructor() 10299 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 10300 : ClassDecl->hasTrivialMoveConstructor()); 10301 10302 // C++0x [class.copy]p9: 10303 // If the definition of a class X does not explicitly declare a move 10304 // constructor, one will be implicitly declared as defaulted if and only if: 10305 // [...] 10306 // - the move constructor would not be implicitly defined as deleted. 10307 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 10308 // Cache this result so that we don't try to generate this over and over 10309 // on every lookup, leaking memory and wasting time. 10310 ClassDecl->setFailedImplicitMoveConstructor(); 10311 return 0; 10312 } 10313 10314 // Note that we have declared this constructor. 10315 ++ASTContext::NumImplicitMoveConstructorsDeclared; 10316 10317 if (Scope *S = getScopeForContext(ClassDecl)) 10318 PushOnScopeChains(MoveConstructor, S, false); 10319 ClassDecl->addDecl(MoveConstructor); 10320 10321 return MoveConstructor; 10322} 10323 10324void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 10325 CXXConstructorDecl *MoveConstructor) { 10326 assert((MoveConstructor->isDefaulted() && 10327 MoveConstructor->isMoveConstructor() && 10328 !MoveConstructor->doesThisDeclarationHaveABody() && 10329 !MoveConstructor->isDeleted()) && 10330 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 10331 10332 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 10333 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 10334 10335 SynthesizedFunctionScope Scope(*this, MoveConstructor); 10336 DiagnosticErrorTrap Trap(Diags); 10337 10338 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 10339 Trap.hasErrorOccurred()) { 10340 Diag(CurrentLocation, diag::note_member_synthesized_at) 10341 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 10342 MoveConstructor->setInvalidDecl(); 10343 } else { 10344 Sema::CompoundScopeRAII CompoundScope(*this); 10345 MoveConstructor->setBody(ActOnCompoundStmt( 10346 MoveConstructor->getLocation(), MoveConstructor->getLocation(), None, 10347 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10348 } 10349 10350 MoveConstructor->markUsed(Context); 10351 10352 if (ASTMutationListener *L = getASTMutationListener()) { 10353 L->CompletedImplicitDefinition(MoveConstructor); 10354 } 10355} 10356 10357bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 10358 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); 10359} 10360 10361void Sema::DefineImplicitLambdaToFunctionPointerConversion( 10362 SourceLocation CurrentLocation, 10363 CXXConversionDecl *Conv) { 10364 CXXRecordDecl *Lambda = Conv->getParent(); 10365 CXXMethodDecl *CallOp = Lambda->getLambdaCallOperator(); 10366 // If we are defining a specialization of a conversion to function-ptr 10367 // cache the deduced template arguments for this specialization 10368 // so that we can use them to retrieve the corresponding call-operator 10369 // and static-invoker. 10370 const TemplateArgumentList *DeducedTemplateArgs = 0; 10371 10372 10373 // Retrieve the corresponding call-operator specialization. 10374 if (Lambda->isGenericLambda()) { 10375 assert(Conv->isFunctionTemplateSpecialization()); 10376 FunctionTemplateDecl *CallOpTemplate = 10377 CallOp->getDescribedFunctionTemplate(); 10378 DeducedTemplateArgs = Conv->getTemplateSpecializationArgs(); 10379 void *InsertPos = 0; 10380 FunctionDecl *CallOpSpec = CallOpTemplate->findSpecialization( 10381 DeducedTemplateArgs->data(), 10382 DeducedTemplateArgs->size(), 10383 InsertPos); 10384 assert(CallOpSpec && 10385 "Conversion operator must have a corresponding call operator"); 10386 CallOp = cast<CXXMethodDecl>(CallOpSpec); 10387 } 10388 // Mark the call operator referenced (and add to pending instantiations 10389 // if necessary). 10390 // For both the conversion and static-invoker template specializations 10391 // we construct their body's in this function, so no need to add them 10392 // to the PendingInstantiations. 10393 MarkFunctionReferenced(CurrentLocation, CallOp); 10394 10395 SynthesizedFunctionScope Scope(*this, Conv); 10396 DiagnosticErrorTrap Trap(Diags); 10397 10398 // Retreive the static invoker... 10399 CXXMethodDecl *Invoker = Lambda->getLambdaStaticInvoker(); 10400 // ... and get the corresponding specialization for a generic lambda. 10401 if (Lambda->isGenericLambda()) { 10402 assert(DeducedTemplateArgs && 10403 "Must have deduced template arguments from Conversion Operator"); 10404 FunctionTemplateDecl *InvokeTemplate = 10405 Invoker->getDescribedFunctionTemplate(); 10406 void *InsertPos = 0; 10407 FunctionDecl *InvokeSpec = InvokeTemplate->findSpecialization( 10408 DeducedTemplateArgs->data(), 10409 DeducedTemplateArgs->size(), 10410 InsertPos); 10411 assert(InvokeSpec && 10412 "Must have a corresponding static invoker specialization"); 10413 Invoker = cast<CXXMethodDecl>(InvokeSpec); 10414 } 10415 // Construct the body of the conversion function { return __invoke; }. 10416 Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(), 10417 VK_LValue, Conv->getLocation()).take(); 10418 assert(FunctionRef && "Can't refer to __invoke function?"); 10419 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 10420 Conv->setBody(new (Context) CompoundStmt(Context, Return, 10421 Conv->getLocation(), 10422 Conv->getLocation())); 10423 10424 Conv->markUsed(Context); 10425 Conv->setReferenced(); 10426 10427 // Fill in the __invoke function with a dummy implementation. IR generation 10428 // will fill in the actual details. 10429 Invoker->markUsed(Context); 10430 Invoker->setReferenced(); 10431 Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation())); 10432 10433 if (ASTMutationListener *L = getASTMutationListener()) { 10434 L->CompletedImplicitDefinition(Conv); 10435 L->CompletedImplicitDefinition(Invoker); 10436 } 10437} 10438 10439 10440 10441void Sema::DefineImplicitLambdaToBlockPointerConversion( 10442 SourceLocation CurrentLocation, 10443 CXXConversionDecl *Conv) 10444{ 10445 assert(!Conv->getParent()->isGenericLambda()); 10446 10447 Conv->markUsed(Context); 10448 10449 SynthesizedFunctionScope Scope(*this, Conv); 10450 DiagnosticErrorTrap Trap(Diags); 10451 10452 // Copy-initialize the lambda object as needed to capture it. 10453 Expr *This = ActOnCXXThis(CurrentLocation).take(); 10454 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 10455 10456 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 10457 Conv->getLocation(), 10458 Conv, DerefThis); 10459 10460 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 10461 // behavior. Note that only the general conversion function does this 10462 // (since it's unusable otherwise); in the case where we inline the 10463 // block literal, it has block literal lifetime semantics. 10464 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 10465 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 10466 CK_CopyAndAutoreleaseBlockObject, 10467 BuildBlock.get(), 0, VK_RValue); 10468 10469 if (BuildBlock.isInvalid()) { 10470 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10471 Conv->setInvalidDecl(); 10472 return; 10473 } 10474 10475 // Create the return statement that returns the block from the conversion 10476 // function. 10477 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10478 if (Return.isInvalid()) { 10479 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10480 Conv->setInvalidDecl(); 10481 return; 10482 } 10483 10484 // Set the body of the conversion function. 10485 Stmt *ReturnS = Return.take(); 10486 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10487 Conv->getLocation(), 10488 Conv->getLocation())); 10489 10490 // We're done; notify the mutation listener, if any. 10491 if (ASTMutationListener *L = getASTMutationListener()) { 10492 L->CompletedImplicitDefinition(Conv); 10493 } 10494} 10495 10496/// \brief Determine whether the given list arguments contains exactly one 10497/// "real" (non-default) argument. 10498static bool hasOneRealArgument(MultiExprArg Args) { 10499 switch (Args.size()) { 10500 case 0: 10501 return false; 10502 10503 default: 10504 if (!Args[1]->isDefaultArgument()) 10505 return false; 10506 10507 // fall through 10508 case 1: 10509 return !Args[0]->isDefaultArgument(); 10510 } 10511 10512 return false; 10513} 10514 10515ExprResult 10516Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10517 CXXConstructorDecl *Constructor, 10518 MultiExprArg ExprArgs, 10519 bool HadMultipleCandidates, 10520 bool IsListInitialization, 10521 bool RequiresZeroInit, 10522 unsigned ConstructKind, 10523 SourceRange ParenRange) { 10524 bool Elidable = false; 10525 10526 // C++0x [class.copy]p34: 10527 // When certain criteria are met, an implementation is allowed to 10528 // omit the copy/move construction of a class object, even if the 10529 // copy/move constructor and/or destructor for the object have 10530 // side effects. [...] 10531 // - when a temporary class object that has not been bound to a 10532 // reference (12.2) would be copied/moved to a class object 10533 // with the same cv-unqualified type, the copy/move operation 10534 // can be omitted by constructing the temporary object 10535 // directly into the target of the omitted copy/move 10536 if (ConstructKind == CXXConstructExpr::CK_Complete && 10537 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10538 Expr *SubExpr = ExprArgs[0]; 10539 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10540 } 10541 10542 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10543 Elidable, ExprArgs, HadMultipleCandidates, 10544 IsListInitialization, RequiresZeroInit, 10545 ConstructKind, ParenRange); 10546} 10547 10548/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10549/// including handling of its default argument expressions. 10550ExprResult 10551Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10552 CXXConstructorDecl *Constructor, bool Elidable, 10553 MultiExprArg ExprArgs, 10554 bool HadMultipleCandidates, 10555 bool IsListInitialization, 10556 bool RequiresZeroInit, 10557 unsigned ConstructKind, 10558 SourceRange ParenRange) { 10559 MarkFunctionReferenced(ConstructLoc, Constructor); 10560 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10561 Constructor, Elidable, ExprArgs, 10562 HadMultipleCandidates, 10563 IsListInitialization, RequiresZeroInit, 10564 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10565 ParenRange)); 10566} 10567 10568void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10569 if (VD->isInvalidDecl()) return; 10570 10571 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10572 if (ClassDecl->isInvalidDecl()) return; 10573 if (ClassDecl->hasIrrelevantDestructor()) return; 10574 if (ClassDecl->isDependentContext()) return; 10575 10576 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10577 MarkFunctionReferenced(VD->getLocation(), Destructor); 10578 CheckDestructorAccess(VD->getLocation(), Destructor, 10579 PDiag(diag::err_access_dtor_var) 10580 << VD->getDeclName() 10581 << VD->getType()); 10582 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10583 10584 if (!VD->hasGlobalStorage()) return; 10585 10586 // Emit warning for non-trivial dtor in global scope (a real global, 10587 // class-static, function-static). 10588 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10589 10590 // TODO: this should be re-enabled for static locals by !CXAAtExit 10591 if (!VD->isStaticLocal()) 10592 Diag(VD->getLocation(), diag::warn_global_destructor); 10593} 10594 10595/// \brief Given a constructor and the set of arguments provided for the 10596/// constructor, convert the arguments and add any required default arguments 10597/// to form a proper call to this constructor. 10598/// 10599/// \returns true if an error occurred, false otherwise. 10600bool 10601Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10602 MultiExprArg ArgsPtr, 10603 SourceLocation Loc, 10604 SmallVectorImpl<Expr*> &ConvertedArgs, 10605 bool AllowExplicit, 10606 bool IsListInitialization) { 10607 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10608 unsigned NumArgs = ArgsPtr.size(); 10609 Expr **Args = ArgsPtr.data(); 10610 10611 const FunctionProtoType *Proto 10612 = Constructor->getType()->getAs<FunctionProtoType>(); 10613 assert(Proto && "Constructor without a prototype?"); 10614 unsigned NumArgsInProto = Proto->getNumArgs(); 10615 10616 // If too few arguments are available, we'll fill in the rest with defaults. 10617 if (NumArgs < NumArgsInProto) 10618 ConvertedArgs.reserve(NumArgsInProto); 10619 else 10620 ConvertedArgs.reserve(NumArgs); 10621 10622 VariadicCallType CallType = 10623 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10624 SmallVector<Expr *, 8> AllArgs; 10625 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10626 Proto, 0, 10627 llvm::makeArrayRef(Args, NumArgs), 10628 AllArgs, 10629 CallType, AllowExplicit, 10630 IsListInitialization); 10631 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10632 10633 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10634 10635 CheckConstructorCall(Constructor, 10636 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10637 AllArgs.size()), 10638 Proto, Loc); 10639 10640 return Invalid; 10641} 10642 10643static inline bool 10644CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10645 const FunctionDecl *FnDecl) { 10646 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10647 if (isa<NamespaceDecl>(DC)) { 10648 return SemaRef.Diag(FnDecl->getLocation(), 10649 diag::err_operator_new_delete_declared_in_namespace) 10650 << FnDecl->getDeclName(); 10651 } 10652 10653 if (isa<TranslationUnitDecl>(DC) && 10654 FnDecl->getStorageClass() == SC_Static) { 10655 return SemaRef.Diag(FnDecl->getLocation(), 10656 diag::err_operator_new_delete_declared_static) 10657 << FnDecl->getDeclName(); 10658 } 10659 10660 return false; 10661} 10662 10663static inline bool 10664CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10665 CanQualType ExpectedResultType, 10666 CanQualType ExpectedFirstParamType, 10667 unsigned DependentParamTypeDiag, 10668 unsigned InvalidParamTypeDiag) { 10669 QualType ResultType = 10670 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10671 10672 // Check that the result type is not dependent. 10673 if (ResultType->isDependentType()) 10674 return SemaRef.Diag(FnDecl->getLocation(), 10675 diag::err_operator_new_delete_dependent_result_type) 10676 << FnDecl->getDeclName() << ExpectedResultType; 10677 10678 // Check that the result type is what we expect. 10679 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10680 return SemaRef.Diag(FnDecl->getLocation(), 10681 diag::err_operator_new_delete_invalid_result_type) 10682 << FnDecl->getDeclName() << ExpectedResultType; 10683 10684 // A function template must have at least 2 parameters. 10685 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10686 return SemaRef.Diag(FnDecl->getLocation(), 10687 diag::err_operator_new_delete_template_too_few_parameters) 10688 << FnDecl->getDeclName(); 10689 10690 // The function decl must have at least 1 parameter. 10691 if (FnDecl->getNumParams() == 0) 10692 return SemaRef.Diag(FnDecl->getLocation(), 10693 diag::err_operator_new_delete_too_few_parameters) 10694 << FnDecl->getDeclName(); 10695 10696 // Check the first parameter type is not dependent. 10697 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10698 if (FirstParamType->isDependentType()) 10699 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10700 << FnDecl->getDeclName() << ExpectedFirstParamType; 10701 10702 // Check that the first parameter type is what we expect. 10703 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10704 ExpectedFirstParamType) 10705 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10706 << FnDecl->getDeclName() << ExpectedFirstParamType; 10707 10708 return false; 10709} 10710 10711static bool 10712CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10713 // C++ [basic.stc.dynamic.allocation]p1: 10714 // A program is ill-formed if an allocation function is declared in a 10715 // namespace scope other than global scope or declared static in global 10716 // scope. 10717 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10718 return true; 10719 10720 CanQualType SizeTy = 10721 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10722 10723 // C++ [basic.stc.dynamic.allocation]p1: 10724 // The return type shall be void*. The first parameter shall have type 10725 // std::size_t. 10726 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10727 SizeTy, 10728 diag::err_operator_new_dependent_param_type, 10729 diag::err_operator_new_param_type)) 10730 return true; 10731 10732 // C++ [basic.stc.dynamic.allocation]p1: 10733 // The first parameter shall not have an associated default argument. 10734 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10735 return SemaRef.Diag(FnDecl->getLocation(), 10736 diag::err_operator_new_default_arg) 10737 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10738 10739 return false; 10740} 10741 10742static bool 10743CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10744 // C++ [basic.stc.dynamic.deallocation]p1: 10745 // A program is ill-formed if deallocation functions are declared in a 10746 // namespace scope other than global scope or declared static in global 10747 // scope. 10748 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10749 return true; 10750 10751 // C++ [basic.stc.dynamic.deallocation]p2: 10752 // Each deallocation function shall return void and its first parameter 10753 // shall be void*. 10754 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10755 SemaRef.Context.VoidPtrTy, 10756 diag::err_operator_delete_dependent_param_type, 10757 diag::err_operator_delete_param_type)) 10758 return true; 10759 10760 return false; 10761} 10762 10763/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10764/// of this overloaded operator is well-formed. If so, returns false; 10765/// otherwise, emits appropriate diagnostics and returns true. 10766bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10767 assert(FnDecl && FnDecl->isOverloadedOperator() && 10768 "Expected an overloaded operator declaration"); 10769 10770 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10771 10772 // C++ [over.oper]p5: 10773 // The allocation and deallocation functions, operator new, 10774 // operator new[], operator delete and operator delete[], are 10775 // described completely in 3.7.3. The attributes and restrictions 10776 // found in the rest of this subclause do not apply to them unless 10777 // explicitly stated in 3.7.3. 10778 if (Op == OO_Delete || Op == OO_Array_Delete) 10779 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10780 10781 if (Op == OO_New || Op == OO_Array_New) 10782 return CheckOperatorNewDeclaration(*this, FnDecl); 10783 10784 // C++ [over.oper]p6: 10785 // An operator function shall either be a non-static member 10786 // function or be a non-member function and have at least one 10787 // parameter whose type is a class, a reference to a class, an 10788 // enumeration, or a reference to an enumeration. 10789 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10790 if (MethodDecl->isStatic()) 10791 return Diag(FnDecl->getLocation(), 10792 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10793 } else { 10794 bool ClassOrEnumParam = false; 10795 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10796 ParamEnd = FnDecl->param_end(); 10797 Param != ParamEnd; ++Param) { 10798 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10799 if (ParamType->isDependentType() || ParamType->isRecordType() || 10800 ParamType->isEnumeralType()) { 10801 ClassOrEnumParam = true; 10802 break; 10803 } 10804 } 10805 10806 if (!ClassOrEnumParam) 10807 return Diag(FnDecl->getLocation(), 10808 diag::err_operator_overload_needs_class_or_enum) 10809 << FnDecl->getDeclName(); 10810 } 10811 10812 // C++ [over.oper]p8: 10813 // An operator function cannot have default arguments (8.3.6), 10814 // except where explicitly stated below. 10815 // 10816 // Only the function-call operator allows default arguments 10817 // (C++ [over.call]p1). 10818 if (Op != OO_Call) { 10819 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10820 Param != FnDecl->param_end(); ++Param) { 10821 if ((*Param)->hasDefaultArg()) 10822 return Diag((*Param)->getLocation(), 10823 diag::err_operator_overload_default_arg) 10824 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10825 } 10826 } 10827 10828 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10829 { false, false, false } 10830#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10831 , { Unary, Binary, MemberOnly } 10832#include "clang/Basic/OperatorKinds.def" 10833 }; 10834 10835 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10836 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10837 bool MustBeMemberOperator = OperatorUses[Op][2]; 10838 10839 // C++ [over.oper]p8: 10840 // [...] Operator functions cannot have more or fewer parameters 10841 // than the number required for the corresponding operator, as 10842 // described in the rest of this subclause. 10843 unsigned NumParams = FnDecl->getNumParams() 10844 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10845 if (Op != OO_Call && 10846 ((NumParams == 1 && !CanBeUnaryOperator) || 10847 (NumParams == 2 && !CanBeBinaryOperator) || 10848 (NumParams < 1) || (NumParams > 2))) { 10849 // We have the wrong number of parameters. 10850 unsigned ErrorKind; 10851 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10852 ErrorKind = 2; // 2 -> unary or binary. 10853 } else if (CanBeUnaryOperator) { 10854 ErrorKind = 0; // 0 -> unary 10855 } else { 10856 assert(CanBeBinaryOperator && 10857 "All non-call overloaded operators are unary or binary!"); 10858 ErrorKind = 1; // 1 -> binary 10859 } 10860 10861 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10862 << FnDecl->getDeclName() << NumParams << ErrorKind; 10863 } 10864 10865 // Overloaded operators other than operator() cannot be variadic. 10866 if (Op != OO_Call && 10867 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10868 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10869 << FnDecl->getDeclName(); 10870 } 10871 10872 // Some operators must be non-static member functions. 10873 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10874 return Diag(FnDecl->getLocation(), 10875 diag::err_operator_overload_must_be_member) 10876 << FnDecl->getDeclName(); 10877 } 10878 10879 // C++ [over.inc]p1: 10880 // The user-defined function called operator++ implements the 10881 // prefix and postfix ++ operator. If this function is a member 10882 // function with no parameters, or a non-member function with one 10883 // parameter of class or enumeration type, it defines the prefix 10884 // increment operator ++ for objects of that type. If the function 10885 // is a member function with one parameter (which shall be of type 10886 // int) or a non-member function with two parameters (the second 10887 // of which shall be of type int), it defines the postfix 10888 // increment operator ++ for objects of that type. 10889 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10890 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10891 bool ParamIsInt = false; 10892 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10893 ParamIsInt = BT->getKind() == BuiltinType::Int; 10894 10895 if (!ParamIsInt) 10896 return Diag(LastParam->getLocation(), 10897 diag::err_operator_overload_post_incdec_must_be_int) 10898 << LastParam->getType() << (Op == OO_MinusMinus); 10899 } 10900 10901 return false; 10902} 10903 10904/// CheckLiteralOperatorDeclaration - Check whether the declaration 10905/// of this literal operator function is well-formed. If so, returns 10906/// false; otherwise, emits appropriate diagnostics and returns true. 10907bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10908 if (isa<CXXMethodDecl>(FnDecl)) { 10909 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10910 << FnDecl->getDeclName(); 10911 return true; 10912 } 10913 10914 if (FnDecl->isExternC()) { 10915 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10916 return true; 10917 } 10918 10919 bool Valid = false; 10920 10921 // This might be the definition of a literal operator template. 10922 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10923 // This might be a specialization of a literal operator template. 10924 if (!TpDecl) 10925 TpDecl = FnDecl->getPrimaryTemplate(); 10926 10927 // template <char...> type operator "" name() and 10928 // template <class T, T...> type operator "" name() are the only valid 10929 // template signatures, and the only valid signatures with no parameters. 10930 if (TpDecl) { 10931 if (FnDecl->param_size() == 0) { 10932 // Must have one or two template parameters 10933 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10934 if (Params->size() == 1) { 10935 NonTypeTemplateParmDecl *PmDecl = 10936 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10937 10938 // The template parameter must be a char parameter pack. 10939 if (PmDecl && PmDecl->isTemplateParameterPack() && 10940 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10941 Valid = true; 10942 } else if (Params->size() == 2) { 10943 TemplateTypeParmDecl *PmType = 10944 dyn_cast<TemplateTypeParmDecl>(Params->getParam(0)); 10945 NonTypeTemplateParmDecl *PmArgs = 10946 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); 10947 10948 // The second template parameter must be a parameter pack with the 10949 // first template parameter as its type. 10950 if (PmType && PmArgs && 10951 !PmType->isTemplateParameterPack() && 10952 PmArgs->isTemplateParameterPack()) { 10953 const TemplateTypeParmType *TArgs = 10954 PmArgs->getType()->getAs<TemplateTypeParmType>(); 10955 if (TArgs && TArgs->getDepth() == PmType->getDepth() && 10956 TArgs->getIndex() == PmType->getIndex()) { 10957 Valid = true; 10958 if (ActiveTemplateInstantiations.empty()) 10959 Diag(FnDecl->getLocation(), 10960 diag::ext_string_literal_operator_template); 10961 } 10962 } 10963 } 10964 } 10965 } else if (FnDecl->param_size()) { 10966 // Check the first parameter 10967 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10968 10969 QualType T = (*Param)->getType().getUnqualifiedType(); 10970 10971 // unsigned long long int, long double, and any character type are allowed 10972 // as the only parameters. 10973 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10974 Context.hasSameType(T, Context.LongDoubleTy) || 10975 Context.hasSameType(T, Context.CharTy) || 10976 Context.hasSameType(T, Context.WideCharTy) || 10977 Context.hasSameType(T, Context.Char16Ty) || 10978 Context.hasSameType(T, Context.Char32Ty)) { 10979 if (++Param == FnDecl->param_end()) 10980 Valid = true; 10981 goto FinishedParams; 10982 } 10983 10984 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10985 const PointerType *PT = T->getAs<PointerType>(); 10986 if (!PT) 10987 goto FinishedParams; 10988 T = PT->getPointeeType(); 10989 if (!T.isConstQualified() || T.isVolatileQualified()) 10990 goto FinishedParams; 10991 T = T.getUnqualifiedType(); 10992 10993 // Move on to the second parameter; 10994 ++Param; 10995 10996 // If there is no second parameter, the first must be a const char * 10997 if (Param == FnDecl->param_end()) { 10998 if (Context.hasSameType(T, Context.CharTy)) 10999 Valid = true; 11000 goto FinishedParams; 11001 } 11002 11003 // const char *, const wchar_t*, const char16_t*, and const char32_t* 11004 // are allowed as the first parameter to a two-parameter function 11005 if (!(Context.hasSameType(T, Context.CharTy) || 11006 Context.hasSameType(T, Context.WideCharTy) || 11007 Context.hasSameType(T, Context.Char16Ty) || 11008 Context.hasSameType(T, Context.Char32Ty))) 11009 goto FinishedParams; 11010 11011 // The second and final parameter must be an std::size_t 11012 T = (*Param)->getType().getUnqualifiedType(); 11013 if (Context.hasSameType(T, Context.getSizeType()) && 11014 ++Param == FnDecl->param_end()) 11015 Valid = true; 11016 } 11017 11018 // FIXME: This diagnostic is absolutely terrible. 11019FinishedParams: 11020 if (!Valid) { 11021 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 11022 << FnDecl->getDeclName(); 11023 return true; 11024 } 11025 11026 // A parameter-declaration-clause containing a default argument is not 11027 // equivalent to any of the permitted forms. 11028 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 11029 ParamEnd = FnDecl->param_end(); 11030 Param != ParamEnd; ++Param) { 11031 if ((*Param)->hasDefaultArg()) { 11032 Diag((*Param)->getDefaultArgRange().getBegin(), 11033 diag::err_literal_operator_default_argument) 11034 << (*Param)->getDefaultArgRange(); 11035 break; 11036 } 11037 } 11038 11039 StringRef LiteralName 11040 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 11041 if (LiteralName[0] != '_') { 11042 // C++11 [usrlit.suffix]p1: 11043 // Literal suffix identifiers that do not start with an underscore 11044 // are reserved for future standardization. 11045 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) 11046 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); 11047 } 11048 11049 return false; 11050} 11051 11052/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 11053/// linkage specification, including the language and (if present) 11054/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 11055/// the location of the language string literal, which is provided 11056/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 11057/// the '{' brace. Otherwise, this linkage specification does not 11058/// have any braces. 11059Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 11060 SourceLocation LangLoc, 11061 StringRef Lang, 11062 SourceLocation LBraceLoc) { 11063 LinkageSpecDecl::LanguageIDs Language; 11064 if (Lang == "\"C\"") 11065 Language = LinkageSpecDecl::lang_c; 11066 else if (Lang == "\"C++\"") 11067 Language = LinkageSpecDecl::lang_cxx; 11068 else { 11069 Diag(LangLoc, diag::err_bad_language); 11070 return 0; 11071 } 11072 11073 // FIXME: Add all the various semantics of linkage specifications 11074 11075 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 11076 ExternLoc, LangLoc, Language, 11077 LBraceLoc.isValid()); 11078 CurContext->addDecl(D); 11079 PushDeclContext(S, D); 11080 return D; 11081} 11082 11083/// ActOnFinishLinkageSpecification - Complete the definition of 11084/// the C++ linkage specification LinkageSpec. If RBraceLoc is 11085/// valid, it's the position of the closing '}' brace in a linkage 11086/// specification that uses braces. 11087Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 11088 Decl *LinkageSpec, 11089 SourceLocation RBraceLoc) { 11090 if (LinkageSpec) { 11091 if (RBraceLoc.isValid()) { 11092 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 11093 LSDecl->setRBraceLoc(RBraceLoc); 11094 } 11095 PopDeclContext(); 11096 } 11097 return LinkageSpec; 11098} 11099 11100Decl *Sema::ActOnEmptyDeclaration(Scope *S, 11101 AttributeList *AttrList, 11102 SourceLocation SemiLoc) { 11103 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 11104 // Attribute declarations appertain to empty declaration so we handle 11105 // them here. 11106 if (AttrList) 11107 ProcessDeclAttributeList(S, ED, AttrList); 11108 11109 CurContext->addDecl(ED); 11110 return ED; 11111} 11112 11113/// \brief Perform semantic analysis for the variable declaration that 11114/// occurs within a C++ catch clause, returning the newly-created 11115/// variable. 11116VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 11117 TypeSourceInfo *TInfo, 11118 SourceLocation StartLoc, 11119 SourceLocation Loc, 11120 IdentifierInfo *Name) { 11121 bool Invalid = false; 11122 QualType ExDeclType = TInfo->getType(); 11123 11124 // Arrays and functions decay. 11125 if (ExDeclType->isArrayType()) 11126 ExDeclType = Context.getArrayDecayedType(ExDeclType); 11127 else if (ExDeclType->isFunctionType()) 11128 ExDeclType = Context.getPointerType(ExDeclType); 11129 11130 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 11131 // The exception-declaration shall not denote a pointer or reference to an 11132 // incomplete type, other than [cv] void*. 11133 // N2844 forbids rvalue references. 11134 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 11135 Diag(Loc, diag::err_catch_rvalue_ref); 11136 Invalid = true; 11137 } 11138 11139 QualType BaseType = ExDeclType; 11140 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 11141 unsigned DK = diag::err_catch_incomplete; 11142 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 11143 BaseType = Ptr->getPointeeType(); 11144 Mode = 1; 11145 DK = diag::err_catch_incomplete_ptr; 11146 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 11147 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 11148 BaseType = Ref->getPointeeType(); 11149 Mode = 2; 11150 DK = diag::err_catch_incomplete_ref; 11151 } 11152 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 11153 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 11154 Invalid = true; 11155 11156 if (!Invalid && !ExDeclType->isDependentType() && 11157 RequireNonAbstractType(Loc, ExDeclType, 11158 diag::err_abstract_type_in_decl, 11159 AbstractVariableType)) 11160 Invalid = true; 11161 11162 // Only the non-fragile NeXT runtime currently supports C++ catches 11163 // of ObjC types, and no runtime supports catching ObjC types by value. 11164 if (!Invalid && getLangOpts().ObjC1) { 11165 QualType T = ExDeclType; 11166 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 11167 T = RT->getPointeeType(); 11168 11169 if (T->isObjCObjectType()) { 11170 Diag(Loc, diag::err_objc_object_catch); 11171 Invalid = true; 11172 } else if (T->isObjCObjectPointerType()) { 11173 // FIXME: should this be a test for macosx-fragile specifically? 11174 if (getLangOpts().ObjCRuntime.isFragile()) 11175 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 11176 } 11177 } 11178 11179 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 11180 ExDeclType, TInfo, SC_None); 11181 ExDecl->setExceptionVariable(true); 11182 11183 // In ARC, infer 'retaining' for variables of retainable type. 11184 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 11185 Invalid = true; 11186 11187 if (!Invalid && !ExDeclType->isDependentType()) { 11188 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 11189 // Insulate this from anything else we might currently be parsing. 11190 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 11191 11192 // C++ [except.handle]p16: 11193 // The object declared in an exception-declaration or, if the 11194 // exception-declaration does not specify a name, a temporary (12.2) is 11195 // copy-initialized (8.5) from the exception object. [...] 11196 // The object is destroyed when the handler exits, after the destruction 11197 // of any automatic objects initialized within the handler. 11198 // 11199 // We just pretend to initialize the object with itself, then make sure 11200 // it can be destroyed later. 11201 QualType initType = ExDeclType; 11202 11203 InitializedEntity entity = 11204 InitializedEntity::InitializeVariable(ExDecl); 11205 InitializationKind initKind = 11206 InitializationKind::CreateCopy(Loc, SourceLocation()); 11207 11208 Expr *opaqueValue = 11209 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 11210 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 11211 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 11212 if (result.isInvalid()) 11213 Invalid = true; 11214 else { 11215 // If the constructor used was non-trivial, set this as the 11216 // "initializer". 11217 CXXConstructExpr *construct = result.takeAs<CXXConstructExpr>(); 11218 if (!construct->getConstructor()->isTrivial()) { 11219 Expr *init = MaybeCreateExprWithCleanups(construct); 11220 ExDecl->setInit(init); 11221 } 11222 11223 // And make sure it's destructable. 11224 FinalizeVarWithDestructor(ExDecl, recordType); 11225 } 11226 } 11227 } 11228 11229 if (Invalid) 11230 ExDecl->setInvalidDecl(); 11231 11232 return ExDecl; 11233} 11234 11235/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 11236/// handler. 11237Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 11238 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11239 bool Invalid = D.isInvalidType(); 11240 11241 // Check for unexpanded parameter packs. 11242 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 11243 UPPC_ExceptionType)) { 11244 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 11245 D.getIdentifierLoc()); 11246 Invalid = true; 11247 } 11248 11249 IdentifierInfo *II = D.getIdentifier(); 11250 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 11251 LookupOrdinaryName, 11252 ForRedeclaration)) { 11253 // The scope should be freshly made just for us. There is just no way 11254 // it contains any previous declaration. 11255 assert(!S->isDeclScope(PrevDecl)); 11256 if (PrevDecl->isTemplateParameter()) { 11257 // Maybe we will complain about the shadowed template parameter. 11258 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 11259 PrevDecl = 0; 11260 } 11261 } 11262 11263 if (D.getCXXScopeSpec().isSet() && !Invalid) { 11264 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 11265 << D.getCXXScopeSpec().getRange(); 11266 Invalid = true; 11267 } 11268 11269 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 11270 D.getLocStart(), 11271 D.getIdentifierLoc(), 11272 D.getIdentifier()); 11273 if (Invalid) 11274 ExDecl->setInvalidDecl(); 11275 11276 // Add the exception declaration into this scope. 11277 if (II) 11278 PushOnScopeChains(ExDecl, S); 11279 else 11280 CurContext->addDecl(ExDecl); 11281 11282 ProcessDeclAttributes(S, ExDecl, D); 11283 return ExDecl; 11284} 11285 11286Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11287 Expr *AssertExpr, 11288 Expr *AssertMessageExpr, 11289 SourceLocation RParenLoc) { 11290 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 11291 11292 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 11293 return 0; 11294 11295 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 11296 AssertMessage, RParenLoc, false); 11297} 11298 11299Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11300 Expr *AssertExpr, 11301 StringLiteral *AssertMessage, 11302 SourceLocation RParenLoc, 11303 bool Failed) { 11304 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 11305 !Failed) { 11306 // In a static_assert-declaration, the constant-expression shall be a 11307 // constant expression that can be contextually converted to bool. 11308 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 11309 if (Converted.isInvalid()) 11310 Failed = true; 11311 11312 llvm::APSInt Cond; 11313 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 11314 diag::err_static_assert_expression_is_not_constant, 11315 /*AllowFold=*/false).isInvalid()) 11316 Failed = true; 11317 11318 if (!Failed && !Cond) { 11319 SmallString<256> MsgBuffer; 11320 llvm::raw_svector_ostream Msg(MsgBuffer); 11321 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 11322 Diag(StaticAssertLoc, diag::err_static_assert_failed) 11323 << Msg.str() << AssertExpr->getSourceRange(); 11324 Failed = true; 11325 } 11326 } 11327 11328 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 11329 AssertExpr, AssertMessage, RParenLoc, 11330 Failed); 11331 11332 CurContext->addDecl(Decl); 11333 return Decl; 11334} 11335 11336/// \brief Perform semantic analysis of the given friend type declaration. 11337/// 11338/// \returns A friend declaration that. 11339FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 11340 SourceLocation FriendLoc, 11341 TypeSourceInfo *TSInfo) { 11342 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 11343 11344 QualType T = TSInfo->getType(); 11345 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 11346 11347 // C++03 [class.friend]p2: 11348 // An elaborated-type-specifier shall be used in a friend declaration 11349 // for a class.* 11350 // 11351 // * The class-key of the elaborated-type-specifier is required. 11352 if (!ActiveTemplateInstantiations.empty()) { 11353 // Do not complain about the form of friend template types during 11354 // template instantiation; we will already have complained when the 11355 // template was declared. 11356 } else { 11357 if (!T->isElaboratedTypeSpecifier()) { 11358 // If we evaluated the type to a record type, suggest putting 11359 // a tag in front. 11360 if (const RecordType *RT = T->getAs<RecordType>()) { 11361 RecordDecl *RD = RT->getDecl(); 11362 11363 std::string InsertionText = std::string(" ") + RD->getKindName(); 11364 11365 Diag(TypeRange.getBegin(), 11366 getLangOpts().CPlusPlus11 ? 11367 diag::warn_cxx98_compat_unelaborated_friend_type : 11368 diag::ext_unelaborated_friend_type) 11369 << (unsigned) RD->getTagKind() 11370 << T 11371 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 11372 InsertionText); 11373 } else { 11374 Diag(FriendLoc, 11375 getLangOpts().CPlusPlus11 ? 11376 diag::warn_cxx98_compat_nonclass_type_friend : 11377 diag::ext_nonclass_type_friend) 11378 << T 11379 << TypeRange; 11380 } 11381 } else if (T->getAs<EnumType>()) { 11382 Diag(FriendLoc, 11383 getLangOpts().CPlusPlus11 ? 11384 diag::warn_cxx98_compat_enum_friend : 11385 diag::ext_enum_friend) 11386 << T 11387 << TypeRange; 11388 } 11389 11390 // C++11 [class.friend]p3: 11391 // A friend declaration that does not declare a function shall have one 11392 // of the following forms: 11393 // friend elaborated-type-specifier ; 11394 // friend simple-type-specifier ; 11395 // friend typename-specifier ; 11396 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 11397 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 11398 } 11399 11400 // If the type specifier in a friend declaration designates a (possibly 11401 // cv-qualified) class type, that class is declared as a friend; otherwise, 11402 // the friend declaration is ignored. 11403 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 11404} 11405 11406/// Handle a friend tag declaration where the scope specifier was 11407/// templated. 11408Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 11409 unsigned TagSpec, SourceLocation TagLoc, 11410 CXXScopeSpec &SS, 11411 IdentifierInfo *Name, 11412 SourceLocation NameLoc, 11413 AttributeList *Attr, 11414 MultiTemplateParamsArg TempParamLists) { 11415 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 11416 11417 bool isExplicitSpecialization = false; 11418 bool Invalid = false; 11419 11420 if (TemplateParameterList *TemplateParams = 11421 MatchTemplateParametersToScopeSpecifier( 11422 TagLoc, NameLoc, SS, TempParamLists, /*friend*/ true, 11423 isExplicitSpecialization, Invalid)) { 11424 if (TemplateParams->size() > 0) { 11425 // This is a declaration of a class template. 11426 if (Invalid) 11427 return 0; 11428 11429 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 11430 SS, Name, NameLoc, Attr, 11431 TemplateParams, AS_public, 11432 /*ModulePrivateLoc=*/SourceLocation(), 11433 TempParamLists.size() - 1, 11434 TempParamLists.data()).take(); 11435 } else { 11436 // The "template<>" header is extraneous. 11437 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 11438 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 11439 isExplicitSpecialization = true; 11440 } 11441 } 11442 11443 if (Invalid) return 0; 11444 11445 bool isAllExplicitSpecializations = true; 11446 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 11447 if (TempParamLists[I]->size()) { 11448 isAllExplicitSpecializations = false; 11449 break; 11450 } 11451 } 11452 11453 // FIXME: don't ignore attributes. 11454 11455 // If it's explicit specializations all the way down, just forget 11456 // about the template header and build an appropriate non-templated 11457 // friend. TODO: for source fidelity, remember the headers. 11458 if (isAllExplicitSpecializations) { 11459 if (SS.isEmpty()) { 11460 bool Owned = false; 11461 bool IsDependent = false; 11462 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 11463 Attr, AS_public, 11464 /*ModulePrivateLoc=*/SourceLocation(), 11465 MultiTemplateParamsArg(), Owned, IsDependent, 11466 /*ScopedEnumKWLoc=*/SourceLocation(), 11467 /*ScopedEnumUsesClassTag=*/false, 11468 /*UnderlyingType=*/TypeResult()); 11469 } 11470 11471 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 11472 ElaboratedTypeKeyword Keyword 11473 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11474 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 11475 *Name, NameLoc); 11476 if (T.isNull()) 11477 return 0; 11478 11479 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11480 if (isa<DependentNameType>(T)) { 11481 DependentNameTypeLoc TL = 11482 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11483 TL.setElaboratedKeywordLoc(TagLoc); 11484 TL.setQualifierLoc(QualifierLoc); 11485 TL.setNameLoc(NameLoc); 11486 } else { 11487 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 11488 TL.setElaboratedKeywordLoc(TagLoc); 11489 TL.setQualifierLoc(QualifierLoc); 11490 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 11491 } 11492 11493 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11494 TSI, FriendLoc, TempParamLists); 11495 Friend->setAccess(AS_public); 11496 CurContext->addDecl(Friend); 11497 return Friend; 11498 } 11499 11500 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11501 11502 11503 11504 // Handle the case of a templated-scope friend class. e.g. 11505 // template <class T> class A<T>::B; 11506 // FIXME: we don't support these right now. 11507 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11508 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11509 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11510 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11511 TL.setElaboratedKeywordLoc(TagLoc); 11512 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11513 TL.setNameLoc(NameLoc); 11514 11515 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11516 TSI, FriendLoc, TempParamLists); 11517 Friend->setAccess(AS_public); 11518 Friend->setUnsupportedFriend(true); 11519 CurContext->addDecl(Friend); 11520 return Friend; 11521} 11522 11523 11524/// Handle a friend type declaration. This works in tandem with 11525/// ActOnTag. 11526/// 11527/// Notes on friend class templates: 11528/// 11529/// We generally treat friend class declarations as if they were 11530/// declaring a class. So, for example, the elaborated type specifier 11531/// in a friend declaration is required to obey the restrictions of a 11532/// class-head (i.e. no typedefs in the scope chain), template 11533/// parameters are required to match up with simple template-ids, &c. 11534/// However, unlike when declaring a template specialization, it's 11535/// okay to refer to a template specialization without an empty 11536/// template parameter declaration, e.g. 11537/// friend class A<T>::B<unsigned>; 11538/// We permit this as a special case; if there are any template 11539/// parameters present at all, require proper matching, i.e. 11540/// template <> template \<class T> friend class A<int>::B; 11541Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11542 MultiTemplateParamsArg TempParams) { 11543 SourceLocation Loc = DS.getLocStart(); 11544 11545 assert(DS.isFriendSpecified()); 11546 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11547 11548 // Try to convert the decl specifier to a type. This works for 11549 // friend templates because ActOnTag never produces a ClassTemplateDecl 11550 // for a TUK_Friend. 11551 Declarator TheDeclarator(DS, Declarator::MemberContext); 11552 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11553 QualType T = TSI->getType(); 11554 if (TheDeclarator.isInvalidType()) 11555 return 0; 11556 11557 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11558 return 0; 11559 11560 // This is definitely an error in C++98. It's probably meant to 11561 // be forbidden in C++0x, too, but the specification is just 11562 // poorly written. 11563 // 11564 // The problem is with declarations like the following: 11565 // template <T> friend A<T>::foo; 11566 // where deciding whether a class C is a friend or not now hinges 11567 // on whether there exists an instantiation of A that causes 11568 // 'foo' to equal C. There are restrictions on class-heads 11569 // (which we declare (by fiat) elaborated friend declarations to 11570 // be) that makes this tractable. 11571 // 11572 // FIXME: handle "template <> friend class A<T>;", which 11573 // is possibly well-formed? Who even knows? 11574 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11575 Diag(Loc, diag::err_tagless_friend_type_template) 11576 << DS.getSourceRange(); 11577 return 0; 11578 } 11579 11580 // C++98 [class.friend]p1: A friend of a class is a function 11581 // or class that is not a member of the class . . . 11582 // This is fixed in DR77, which just barely didn't make the C++03 11583 // deadline. It's also a very silly restriction that seriously 11584 // affects inner classes and which nobody else seems to implement; 11585 // thus we never diagnose it, not even in -pedantic. 11586 // 11587 // But note that we could warn about it: it's always useless to 11588 // friend one of your own members (it's not, however, worthless to 11589 // friend a member of an arbitrary specialization of your template). 11590 11591 Decl *D; 11592 if (unsigned NumTempParamLists = TempParams.size()) 11593 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11594 NumTempParamLists, 11595 TempParams.data(), 11596 TSI, 11597 DS.getFriendSpecLoc()); 11598 else 11599 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11600 11601 if (!D) 11602 return 0; 11603 11604 D->setAccess(AS_public); 11605 CurContext->addDecl(D); 11606 11607 return D; 11608} 11609 11610NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11611 MultiTemplateParamsArg TemplateParams) { 11612 const DeclSpec &DS = D.getDeclSpec(); 11613 11614 assert(DS.isFriendSpecified()); 11615 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11616 11617 SourceLocation Loc = D.getIdentifierLoc(); 11618 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11619 11620 // C++ [class.friend]p1 11621 // A friend of a class is a function or class.... 11622 // Note that this sees through typedefs, which is intended. 11623 // It *doesn't* see through dependent types, which is correct 11624 // according to [temp.arg.type]p3: 11625 // If a declaration acquires a function type through a 11626 // type dependent on a template-parameter and this causes 11627 // a declaration that does not use the syntactic form of a 11628 // function declarator to have a function type, the program 11629 // is ill-formed. 11630 if (!TInfo->getType()->isFunctionType()) { 11631 Diag(Loc, diag::err_unexpected_friend); 11632 11633 // It might be worthwhile to try to recover by creating an 11634 // appropriate declaration. 11635 return 0; 11636 } 11637 11638 // C++ [namespace.memdef]p3 11639 // - If a friend declaration in a non-local class first declares a 11640 // class or function, the friend class or function is a member 11641 // of the innermost enclosing namespace. 11642 // - The name of the friend is not found by simple name lookup 11643 // until a matching declaration is provided in that namespace 11644 // scope (either before or after the class declaration granting 11645 // friendship). 11646 // - If a friend function is called, its name may be found by the 11647 // name lookup that considers functions from namespaces and 11648 // classes associated with the types of the function arguments. 11649 // - When looking for a prior declaration of a class or a function 11650 // declared as a friend, scopes outside the innermost enclosing 11651 // namespace scope are not considered. 11652 11653 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11654 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11655 DeclarationName Name = NameInfo.getName(); 11656 assert(Name); 11657 11658 // Check for unexpanded parameter packs. 11659 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11660 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11661 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11662 return 0; 11663 11664 // The context we found the declaration in, or in which we should 11665 // create the declaration. 11666 DeclContext *DC; 11667 Scope *DCScope = S; 11668 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11669 ForRedeclaration); 11670 11671 // There are five cases here. 11672 // - There's no scope specifier and we're in a local class. Only look 11673 // for functions declared in the immediately-enclosing block scope. 11674 // We recover from invalid scope qualifiers as if they just weren't there. 11675 FunctionDecl *FunctionContainingLocalClass = 0; 11676 if ((SS.isInvalid() || !SS.isSet()) && 11677 (FunctionContainingLocalClass = 11678 cast<CXXRecordDecl>(CurContext)->isLocalClass())) { 11679 // C++11 [class.friend]p11: 11680 // If a friend declaration appears in a local class and the name 11681 // specified is an unqualified name, a prior declaration is 11682 // looked up without considering scopes that are outside the 11683 // innermost enclosing non-class scope. For a friend function 11684 // declaration, if there is no prior declaration, the program is 11685 // ill-formed. 11686 11687 // Find the innermost enclosing non-class scope. This is the block 11688 // scope containing the local class definition (or for a nested class, 11689 // the outer local class). 11690 DCScope = S->getFnParent(); 11691 11692 // Look up the function name in the scope. 11693 Previous.clear(LookupLocalFriendName); 11694 LookupName(Previous, S, /*AllowBuiltinCreation*/false); 11695 11696 if (!Previous.empty()) { 11697 // All possible previous declarations must have the same context: 11698 // either they were declared at block scope or they are members of 11699 // one of the enclosing local classes. 11700 DC = Previous.getRepresentativeDecl()->getDeclContext(); 11701 } else { 11702 // This is ill-formed, but provide the context that we would have 11703 // declared the function in, if we were permitted to, for error recovery. 11704 DC = FunctionContainingLocalClass; 11705 } 11706 adjustContextForLocalExternDecl(DC); 11707 11708 // C++ [class.friend]p6: 11709 // A function can be defined in a friend declaration of a class if and 11710 // only if the class is a non-local class (9.8), the function name is 11711 // unqualified, and the function has namespace scope. 11712 if (D.isFunctionDefinition()) { 11713 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11714 } 11715 11716 // - There's no scope specifier, in which case we just go to the 11717 // appropriate scope and look for a function or function template 11718 // there as appropriate. 11719 } else if (SS.isInvalid() || !SS.isSet()) { 11720 // C++11 [namespace.memdef]p3: 11721 // If the name in a friend declaration is neither qualified nor 11722 // a template-id and the declaration is a function or an 11723 // elaborated-type-specifier, the lookup to determine whether 11724 // the entity has been previously declared shall not consider 11725 // any scopes outside the innermost enclosing namespace. 11726 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11727 11728 // Find the appropriate context according to the above. 11729 DC = CurContext; 11730 11731 // Skip class contexts. If someone can cite chapter and verse 11732 // for this behavior, that would be nice --- it's what GCC and 11733 // EDG do, and it seems like a reasonable intent, but the spec 11734 // really only says that checks for unqualified existing 11735 // declarations should stop at the nearest enclosing namespace, 11736 // not that they should only consider the nearest enclosing 11737 // namespace. 11738 while (DC->isRecord()) 11739 DC = DC->getParent(); 11740 11741 DeclContext *LookupDC = DC; 11742 while (LookupDC->isTransparentContext()) 11743 LookupDC = LookupDC->getParent(); 11744 11745 while (true) { 11746 LookupQualifiedName(Previous, LookupDC); 11747 11748 if (!Previous.empty()) { 11749 DC = LookupDC; 11750 break; 11751 } 11752 11753 if (isTemplateId) { 11754 if (isa<TranslationUnitDecl>(LookupDC)) break; 11755 } else { 11756 if (LookupDC->isFileContext()) break; 11757 } 11758 LookupDC = LookupDC->getParent(); 11759 } 11760 11761 DCScope = getScopeForDeclContext(S, DC); 11762 11763 // - There's a non-dependent scope specifier, in which case we 11764 // compute it and do a previous lookup there for a function 11765 // or function template. 11766 } else if (!SS.getScopeRep()->isDependent()) { 11767 DC = computeDeclContext(SS); 11768 if (!DC) return 0; 11769 11770 if (RequireCompleteDeclContext(SS, DC)) return 0; 11771 11772 LookupQualifiedName(Previous, DC); 11773 11774 // Ignore things found implicitly in the wrong scope. 11775 // TODO: better diagnostics for this case. Suggesting the right 11776 // qualified scope would be nice... 11777 LookupResult::Filter F = Previous.makeFilter(); 11778 while (F.hasNext()) { 11779 NamedDecl *D = F.next(); 11780 if (!DC->InEnclosingNamespaceSetOf( 11781 D->getDeclContext()->getRedeclContext())) 11782 F.erase(); 11783 } 11784 F.done(); 11785 11786 if (Previous.empty()) { 11787 D.setInvalidType(); 11788 Diag(Loc, diag::err_qualified_friend_not_found) 11789 << Name << TInfo->getType(); 11790 return 0; 11791 } 11792 11793 // C++ [class.friend]p1: A friend of a class is a function or 11794 // class that is not a member of the class . . . 11795 if (DC->Equals(CurContext)) 11796 Diag(DS.getFriendSpecLoc(), 11797 getLangOpts().CPlusPlus11 ? 11798 diag::warn_cxx98_compat_friend_is_member : 11799 diag::err_friend_is_member); 11800 11801 if (D.isFunctionDefinition()) { 11802 // C++ [class.friend]p6: 11803 // A function can be defined in a friend declaration of a class if and 11804 // only if the class is a non-local class (9.8), the function name is 11805 // unqualified, and the function has namespace scope. 11806 SemaDiagnosticBuilder DB 11807 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11808 11809 DB << SS.getScopeRep(); 11810 if (DC->isFileContext()) 11811 DB << FixItHint::CreateRemoval(SS.getRange()); 11812 SS.clear(); 11813 } 11814 11815 // - There's a scope specifier that does not match any template 11816 // parameter lists, in which case we use some arbitrary context, 11817 // create a method or method template, and wait for instantiation. 11818 // - There's a scope specifier that does match some template 11819 // parameter lists, which we don't handle right now. 11820 } else { 11821 if (D.isFunctionDefinition()) { 11822 // C++ [class.friend]p6: 11823 // A function can be defined in a friend declaration of a class if and 11824 // only if the class is a non-local class (9.8), the function name is 11825 // unqualified, and the function has namespace scope. 11826 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11827 << SS.getScopeRep(); 11828 } 11829 11830 DC = CurContext; 11831 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11832 } 11833 11834 if (!DC->isRecord()) { 11835 // This implies that it has to be an operator or function. 11836 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11837 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11838 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11839 Diag(Loc, diag::err_introducing_special_friend) << 11840 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11841 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11842 return 0; 11843 } 11844 } 11845 11846 // FIXME: This is an egregious hack to cope with cases where the scope stack 11847 // does not contain the declaration context, i.e., in an out-of-line 11848 // definition of a class. 11849 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11850 if (!DCScope) { 11851 FakeDCScope.setEntity(DC); 11852 DCScope = &FakeDCScope; 11853 } 11854 11855 bool AddToScope = true; 11856 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11857 TemplateParams, AddToScope); 11858 if (!ND) return 0; 11859 11860 assert(ND->getLexicalDeclContext() == CurContext); 11861 11862 // If we performed typo correction, we might have added a scope specifier 11863 // and changed the decl context. 11864 DC = ND->getDeclContext(); 11865 11866 // Add the function declaration to the appropriate lookup tables, 11867 // adjusting the redeclarations list as necessary. We don't 11868 // want to do this yet if the friending class is dependent. 11869 // 11870 // Also update the scope-based lookup if the target context's 11871 // lookup context is in lexical scope. 11872 if (!CurContext->isDependentContext()) { 11873 DC = DC->getRedeclContext(); 11874 DC->makeDeclVisibleInContext(ND); 11875 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11876 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11877 } 11878 11879 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11880 D.getIdentifierLoc(), ND, 11881 DS.getFriendSpecLoc()); 11882 FrD->setAccess(AS_public); 11883 CurContext->addDecl(FrD); 11884 11885 if (ND->isInvalidDecl()) { 11886 FrD->setInvalidDecl(); 11887 } else { 11888 if (DC->isRecord()) CheckFriendAccess(ND); 11889 11890 FunctionDecl *FD; 11891 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11892 FD = FTD->getTemplatedDecl(); 11893 else 11894 FD = cast<FunctionDecl>(ND); 11895 11896 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a 11897 // default argument expression, that declaration shall be a definition 11898 // and shall be the only declaration of the function or function 11899 // template in the translation unit. 11900 if (functionDeclHasDefaultArgument(FD)) { 11901 if (FunctionDecl *OldFD = FD->getPreviousDecl()) { 11902 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 11903 Diag(OldFD->getLocation(), diag::note_previous_declaration); 11904 } else if (!D.isFunctionDefinition()) 11905 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); 11906 } 11907 11908 // Mark templated-scope function declarations as unsupported. 11909 if (FD->getNumTemplateParameterLists()) 11910 FrD->setUnsupportedFriend(true); 11911 } 11912 11913 return ND; 11914} 11915 11916void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11917 AdjustDeclIfTemplate(Dcl); 11918 11919 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11920 if (!Fn) { 11921 Diag(DelLoc, diag::err_deleted_non_function); 11922 return; 11923 } 11924 11925 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11926 // Don't consider the implicit declaration we generate for explicit 11927 // specializations. FIXME: Do not generate these implicit declarations. 11928 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11929 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11930 Diag(DelLoc, diag::err_deleted_decl_not_first); 11931 Diag(Prev->getLocation(), diag::note_previous_declaration); 11932 } 11933 // If the declaration wasn't the first, we delete the function anyway for 11934 // recovery. 11935 Fn = Fn->getCanonicalDecl(); 11936 } 11937 11938 if (Fn->isDeleted()) 11939 return; 11940 11941 // See if we're deleting a function which is already known to override a 11942 // non-deleted virtual function. 11943 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11944 bool IssuedDiagnostic = false; 11945 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11946 E = MD->end_overridden_methods(); 11947 I != E; ++I) { 11948 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11949 if (!IssuedDiagnostic) { 11950 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11951 IssuedDiagnostic = true; 11952 } 11953 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11954 } 11955 } 11956 } 11957 11958 Fn->setDeletedAsWritten(); 11959} 11960 11961void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11962 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11963 11964 if (MD) { 11965 if (MD->getParent()->isDependentType()) { 11966 MD->setDefaulted(); 11967 MD->setExplicitlyDefaulted(); 11968 return; 11969 } 11970 11971 CXXSpecialMember Member = getSpecialMember(MD); 11972 if (Member == CXXInvalid) { 11973 if (!MD->isInvalidDecl()) 11974 Diag(DefaultLoc, diag::err_default_special_members); 11975 return; 11976 } 11977 11978 MD->setDefaulted(); 11979 MD->setExplicitlyDefaulted(); 11980 11981 // If this definition appears within the record, do the checking when 11982 // the record is complete. 11983 const FunctionDecl *Primary = MD; 11984 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11985 // Find the uninstantiated declaration that actually had the '= default' 11986 // on it. 11987 Pattern->isDefined(Primary); 11988 11989 // If the method was defaulted on its first declaration, we will have 11990 // already performed the checking in CheckCompletedCXXClass. Such a 11991 // declaration doesn't trigger an implicit definition. 11992 if (Primary == Primary->getCanonicalDecl()) 11993 return; 11994 11995 CheckExplicitlyDefaultedSpecialMember(MD); 11996 11997 // The exception specification is needed because we are defining the 11998 // function. 11999 ResolveExceptionSpec(DefaultLoc, 12000 MD->getType()->castAs<FunctionProtoType>()); 12001 12002 if (MD->isInvalidDecl()) 12003 return; 12004 12005 switch (Member) { 12006 case CXXDefaultConstructor: 12007 DefineImplicitDefaultConstructor(DefaultLoc, 12008 cast<CXXConstructorDecl>(MD)); 12009 break; 12010 case CXXCopyConstructor: 12011 DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 12012 break; 12013 case CXXCopyAssignment: 12014 DefineImplicitCopyAssignment(DefaultLoc, MD); 12015 break; 12016 case CXXDestructor: 12017 DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); 12018 break; 12019 case CXXMoveConstructor: 12020 DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 12021 break; 12022 case CXXMoveAssignment: 12023 DefineImplicitMoveAssignment(DefaultLoc, MD); 12024 break; 12025 case CXXInvalid: 12026 llvm_unreachable("Invalid special member."); 12027 } 12028 } else { 12029 Diag(DefaultLoc, diag::err_default_special_members); 12030 } 12031} 12032 12033static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 12034 for (Stmt::child_range CI = S->children(); CI; ++CI) { 12035 Stmt *SubStmt = *CI; 12036 if (!SubStmt) 12037 continue; 12038 if (isa<ReturnStmt>(SubStmt)) 12039 Self.Diag(SubStmt->getLocStart(), 12040 diag::err_return_in_constructor_handler); 12041 if (!isa<Expr>(SubStmt)) 12042 SearchForReturnInStmt(Self, SubStmt); 12043 } 12044} 12045 12046void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 12047 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 12048 CXXCatchStmt *Handler = TryBlock->getHandler(I); 12049 SearchForReturnInStmt(*this, Handler); 12050 } 12051} 12052 12053bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 12054 const CXXMethodDecl *Old) { 12055 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 12056 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 12057 12058 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 12059 12060 // If the calling conventions match, everything is fine 12061 if (NewCC == OldCC) 12062 return false; 12063 12064 Diag(New->getLocation(), 12065 diag::err_conflicting_overriding_cc_attributes) 12066 << New->getDeclName() << New->getType() << Old->getType(); 12067 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12068 return true; 12069} 12070 12071bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 12072 const CXXMethodDecl *Old) { 12073 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 12074 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 12075 12076 if (Context.hasSameType(NewTy, OldTy) || 12077 NewTy->isDependentType() || OldTy->isDependentType()) 12078 return false; 12079 12080 // Check if the return types are covariant 12081 QualType NewClassTy, OldClassTy; 12082 12083 /// Both types must be pointers or references to classes. 12084 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 12085 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 12086 NewClassTy = NewPT->getPointeeType(); 12087 OldClassTy = OldPT->getPointeeType(); 12088 } 12089 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 12090 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 12091 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 12092 NewClassTy = NewRT->getPointeeType(); 12093 OldClassTy = OldRT->getPointeeType(); 12094 } 12095 } 12096 } 12097 12098 // The return types aren't either both pointers or references to a class type. 12099 if (NewClassTy.isNull()) { 12100 Diag(New->getLocation(), 12101 diag::err_different_return_type_for_overriding_virtual_function) 12102 << New->getDeclName() << NewTy << OldTy; 12103 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12104 12105 return true; 12106 } 12107 12108 // C++ [class.virtual]p6: 12109 // If the return type of D::f differs from the return type of B::f, the 12110 // class type in the return type of D::f shall be complete at the point of 12111 // declaration of D::f or shall be the class type D. 12112 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 12113 if (!RT->isBeingDefined() && 12114 RequireCompleteType(New->getLocation(), NewClassTy, 12115 diag::err_covariant_return_incomplete, 12116 New->getDeclName())) 12117 return true; 12118 } 12119 12120 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 12121 // Check if the new class derives from the old class. 12122 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 12123 Diag(New->getLocation(), 12124 diag::err_covariant_return_not_derived) 12125 << New->getDeclName() << NewTy << OldTy; 12126 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12127 return true; 12128 } 12129 12130 // Check if we the conversion from derived to base is valid. 12131 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 12132 diag::err_covariant_return_inaccessible_base, 12133 diag::err_covariant_return_ambiguous_derived_to_base_conv, 12134 // FIXME: Should this point to the return type? 12135 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 12136 // FIXME: this note won't trigger for delayed access control 12137 // diagnostics, and it's impossible to get an undelayed error 12138 // here from access control during the original parse because 12139 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 12140 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12141 return true; 12142 } 12143 } 12144 12145 // The qualifiers of the return types must be the same. 12146 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 12147 Diag(New->getLocation(), 12148 diag::err_covariant_return_type_different_qualifications) 12149 << New->getDeclName() << NewTy << OldTy; 12150 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12151 return true; 12152 }; 12153 12154 12155 // The new class type must have the same or less qualifiers as the old type. 12156 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 12157 Diag(New->getLocation(), 12158 diag::err_covariant_return_type_class_type_more_qualified) 12159 << New->getDeclName() << NewTy << OldTy; 12160 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12161 return true; 12162 }; 12163 12164 return false; 12165} 12166 12167/// \brief Mark the given method pure. 12168/// 12169/// \param Method the method to be marked pure. 12170/// 12171/// \param InitRange the source range that covers the "0" initializer. 12172bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 12173 SourceLocation EndLoc = InitRange.getEnd(); 12174 if (EndLoc.isValid()) 12175 Method->setRangeEnd(EndLoc); 12176 12177 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 12178 Method->setPure(); 12179 return false; 12180 } 12181 12182 if (!Method->isInvalidDecl()) 12183 Diag(Method->getLocation(), diag::err_non_virtual_pure) 12184 << Method->getDeclName() << InitRange; 12185 return true; 12186} 12187 12188/// \brief Determine whether the given declaration is a static data member. 12189static bool isStaticDataMember(const Decl *D) { 12190 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) 12191 return Var->isStaticDataMember(); 12192 12193 return false; 12194} 12195 12196/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 12197/// an initializer for the out-of-line declaration 'Dcl'. The scope 12198/// is a fresh scope pushed for just this purpose. 12199/// 12200/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 12201/// static data member of class X, names should be looked up in the scope of 12202/// class X. 12203void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 12204 // If there is no declaration, there was an error parsing it. 12205 if (D == 0 || D->isInvalidDecl()) return; 12206 12207 // We should only get called for declarations with scope specifiers, like: 12208 // int foo::bar; 12209 assert(D->isOutOfLine()); 12210 EnterDeclaratorContext(S, D->getDeclContext()); 12211 12212 // If we are parsing the initializer for a static data member, push a 12213 // new expression evaluation context that is associated with this static 12214 // data member. 12215 if (isStaticDataMember(D)) 12216 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 12217} 12218 12219/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 12220/// initializer for the out-of-line declaration 'D'. 12221void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 12222 // If there is no declaration, there was an error parsing it. 12223 if (D == 0 || D->isInvalidDecl()) return; 12224 12225 if (isStaticDataMember(D)) 12226 PopExpressionEvaluationContext(); 12227 12228 assert(D->isOutOfLine()); 12229 ExitDeclaratorContext(S); 12230} 12231 12232/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 12233/// C++ if/switch/while/for statement. 12234/// e.g: "if (int x = f()) {...}" 12235DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 12236 // C++ 6.4p2: 12237 // The declarator shall not specify a function or an array. 12238 // The type-specifier-seq shall not contain typedef and shall not declare a 12239 // new class or enumeration. 12240 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 12241 "Parser allowed 'typedef' as storage class of condition decl."); 12242 12243 Decl *Dcl = ActOnDeclarator(S, D); 12244 if (!Dcl) 12245 return true; 12246 12247 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 12248 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 12249 << D.getSourceRange(); 12250 return true; 12251 } 12252 12253 return Dcl; 12254} 12255 12256void Sema::LoadExternalVTableUses() { 12257 if (!ExternalSource) 12258 return; 12259 12260 SmallVector<ExternalVTableUse, 4> VTables; 12261 ExternalSource->ReadUsedVTables(VTables); 12262 SmallVector<VTableUse, 4> NewUses; 12263 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 12264 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 12265 = VTablesUsed.find(VTables[I].Record); 12266 // Even if a definition wasn't required before, it may be required now. 12267 if (Pos != VTablesUsed.end()) { 12268 if (!Pos->second && VTables[I].DefinitionRequired) 12269 Pos->second = true; 12270 continue; 12271 } 12272 12273 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 12274 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 12275 } 12276 12277 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 12278} 12279 12280void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 12281 bool DefinitionRequired) { 12282 // Ignore any vtable uses in unevaluated operands or for classes that do 12283 // not have a vtable. 12284 if (!Class->isDynamicClass() || Class->isDependentContext() || 12285 CurContext->isDependentContext() || isUnevaluatedContext()) 12286 return; 12287 12288 // Try to insert this class into the map. 12289 LoadExternalVTableUses(); 12290 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12291 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 12292 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 12293 if (!Pos.second) { 12294 // If we already had an entry, check to see if we are promoting this vtable 12295 // to required a definition. If so, we need to reappend to the VTableUses 12296 // list, since we may have already processed the first entry. 12297 if (DefinitionRequired && !Pos.first->second) { 12298 Pos.first->second = true; 12299 } else { 12300 // Otherwise, we can early exit. 12301 return; 12302 } 12303 } 12304 12305 // Local classes need to have their virtual members marked 12306 // immediately. For all other classes, we mark their virtual members 12307 // at the end of the translation unit. 12308 if (Class->isLocalClass()) 12309 MarkVirtualMembersReferenced(Loc, Class); 12310 else 12311 VTableUses.push_back(std::make_pair(Class, Loc)); 12312} 12313 12314bool Sema::DefineUsedVTables() { 12315 LoadExternalVTableUses(); 12316 if (VTableUses.empty()) 12317 return false; 12318 12319 // Note: The VTableUses vector could grow as a result of marking 12320 // the members of a class as "used", so we check the size each 12321 // time through the loop and prefer indices (which are stable) to 12322 // iterators (which are not). 12323 bool DefinedAnything = false; 12324 for (unsigned I = 0; I != VTableUses.size(); ++I) { 12325 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 12326 if (!Class) 12327 continue; 12328 12329 SourceLocation Loc = VTableUses[I].second; 12330 12331 bool DefineVTable = true; 12332 12333 // If this class has a key function, but that key function is 12334 // defined in another translation unit, we don't need to emit the 12335 // vtable even though we're using it. 12336 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 12337 if (KeyFunction && !KeyFunction->hasBody()) { 12338 // The key function is in another translation unit. 12339 DefineVTable = false; 12340 TemplateSpecializationKind TSK = 12341 KeyFunction->getTemplateSpecializationKind(); 12342 assert(TSK != TSK_ExplicitInstantiationDefinition && 12343 TSK != TSK_ImplicitInstantiation && 12344 "Instantiations don't have key functions"); 12345 (void)TSK; 12346 } else if (!KeyFunction) { 12347 // If we have a class with no key function that is the subject 12348 // of an explicit instantiation declaration, suppress the 12349 // vtable; it will live with the explicit instantiation 12350 // definition. 12351 bool IsExplicitInstantiationDeclaration 12352 = Class->getTemplateSpecializationKind() 12353 == TSK_ExplicitInstantiationDeclaration; 12354 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 12355 REnd = Class->redecls_end(); 12356 R != REnd; ++R) { 12357 TemplateSpecializationKind TSK 12358 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 12359 if (TSK == TSK_ExplicitInstantiationDeclaration) 12360 IsExplicitInstantiationDeclaration = true; 12361 else if (TSK == TSK_ExplicitInstantiationDefinition) { 12362 IsExplicitInstantiationDeclaration = false; 12363 break; 12364 } 12365 } 12366 12367 if (IsExplicitInstantiationDeclaration) 12368 DefineVTable = false; 12369 } 12370 12371 // The exception specifications for all virtual members may be needed even 12372 // if we are not providing an authoritative form of the vtable in this TU. 12373 // We may choose to emit it available_externally anyway. 12374 if (!DefineVTable) { 12375 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 12376 continue; 12377 } 12378 12379 // Mark all of the virtual members of this class as referenced, so 12380 // that we can build a vtable. Then, tell the AST consumer that a 12381 // vtable for this class is required. 12382 DefinedAnything = true; 12383 MarkVirtualMembersReferenced(Loc, Class); 12384 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12385 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 12386 12387 // Optionally warn if we're emitting a weak vtable. 12388 if (Class->isExternallyVisible() && 12389 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 12390 const FunctionDecl *KeyFunctionDef = 0; 12391 if (!KeyFunction || 12392 (KeyFunction->hasBody(KeyFunctionDef) && 12393 KeyFunctionDef->isInlined())) 12394 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 12395 TSK_ExplicitInstantiationDefinition 12396 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 12397 << Class; 12398 } 12399 } 12400 VTableUses.clear(); 12401 12402 return DefinedAnything; 12403} 12404 12405void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 12406 const CXXRecordDecl *RD) { 12407 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 12408 E = RD->method_end(); I != E; ++I) 12409 if ((*I)->isVirtual() && !(*I)->isPure()) 12410 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 12411} 12412 12413void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 12414 const CXXRecordDecl *RD) { 12415 // Mark all functions which will appear in RD's vtable as used. 12416 CXXFinalOverriderMap FinalOverriders; 12417 RD->getFinalOverriders(FinalOverriders); 12418 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 12419 E = FinalOverriders.end(); 12420 I != E; ++I) { 12421 for (OverridingMethods::const_iterator OI = I->second.begin(), 12422 OE = I->second.end(); 12423 OI != OE; ++OI) { 12424 assert(OI->second.size() > 0 && "no final overrider"); 12425 CXXMethodDecl *Overrider = OI->second.front().Method; 12426 12427 // C++ [basic.def.odr]p2: 12428 // [...] A virtual member function is used if it is not pure. [...] 12429 if (!Overrider->isPure()) 12430 MarkFunctionReferenced(Loc, Overrider); 12431 } 12432 } 12433 12434 // Only classes that have virtual bases need a VTT. 12435 if (RD->getNumVBases() == 0) 12436 return; 12437 12438 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 12439 e = RD->bases_end(); i != e; ++i) { 12440 const CXXRecordDecl *Base = 12441 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 12442 if (Base->getNumVBases() == 0) 12443 continue; 12444 MarkVirtualMembersReferenced(Loc, Base); 12445 } 12446} 12447 12448/// SetIvarInitializers - This routine builds initialization ASTs for the 12449/// Objective-C implementation whose ivars need be initialized. 12450void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 12451 if (!getLangOpts().CPlusPlus) 12452 return; 12453 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 12454 SmallVector<ObjCIvarDecl*, 8> ivars; 12455 CollectIvarsToConstructOrDestruct(OID, ivars); 12456 if (ivars.empty()) 12457 return; 12458 SmallVector<CXXCtorInitializer*, 32> AllToInit; 12459 for (unsigned i = 0; i < ivars.size(); i++) { 12460 FieldDecl *Field = ivars[i]; 12461 if (Field->isInvalidDecl()) 12462 continue; 12463 12464 CXXCtorInitializer *Member; 12465 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 12466 InitializationKind InitKind = 12467 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 12468 12469 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 12470 ExprResult MemberInit = 12471 InitSeq.Perform(*this, InitEntity, InitKind, None); 12472 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 12473 // Note, MemberInit could actually come back empty if no initialization 12474 // is required (e.g., because it would call a trivial default constructor) 12475 if (!MemberInit.get() || MemberInit.isInvalid()) 12476 continue; 12477 12478 Member = 12479 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 12480 SourceLocation(), 12481 MemberInit.takeAs<Expr>(), 12482 SourceLocation()); 12483 AllToInit.push_back(Member); 12484 12485 // Be sure that the destructor is accessible and is marked as referenced. 12486 if (const RecordType *RecordTy 12487 = Context.getBaseElementType(Field->getType()) 12488 ->getAs<RecordType>()) { 12489 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 12490 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 12491 MarkFunctionReferenced(Field->getLocation(), Destructor); 12492 CheckDestructorAccess(Field->getLocation(), Destructor, 12493 PDiag(diag::err_access_dtor_ivar) 12494 << Context.getBaseElementType(Field->getType())); 12495 } 12496 } 12497 } 12498 ObjCImplementation->setIvarInitializers(Context, 12499 AllToInit.data(), AllToInit.size()); 12500 } 12501} 12502 12503static 12504void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12505 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12506 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12507 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12508 Sema &S) { 12509 if (Ctor->isInvalidDecl()) 12510 return; 12511 12512 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12513 12514 // Target may not be determinable yet, for instance if this is a dependent 12515 // call in an uninstantiated template. 12516 if (Target) { 12517 const FunctionDecl *FNTarget = 0; 12518 (void)Target->hasBody(FNTarget); 12519 Target = const_cast<CXXConstructorDecl*>( 12520 cast_or_null<CXXConstructorDecl>(FNTarget)); 12521 } 12522 12523 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12524 // Avoid dereferencing a null pointer here. 12525 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12526 12527 if (!Current.insert(Canonical)) 12528 return; 12529 12530 // We know that beyond here, we aren't chaining into a cycle. 12531 if (!Target || !Target->isDelegatingConstructor() || 12532 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12533 Valid.insert(Current.begin(), Current.end()); 12534 Current.clear(); 12535 // We've hit a cycle. 12536 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12537 Current.count(TCanonical)) { 12538 // If we haven't diagnosed this cycle yet, do so now. 12539 if (!Invalid.count(TCanonical)) { 12540 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12541 diag::warn_delegating_ctor_cycle) 12542 << Ctor; 12543 12544 // Don't add a note for a function delegating directly to itself. 12545 if (TCanonical != Canonical) 12546 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12547 12548 CXXConstructorDecl *C = Target; 12549 while (C->getCanonicalDecl() != Canonical) { 12550 const FunctionDecl *FNTarget = 0; 12551 (void)C->getTargetConstructor()->hasBody(FNTarget); 12552 assert(FNTarget && "Ctor cycle through bodiless function"); 12553 12554 C = const_cast<CXXConstructorDecl*>( 12555 cast<CXXConstructorDecl>(FNTarget)); 12556 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12557 } 12558 } 12559 12560 Invalid.insert(Current.begin(), Current.end()); 12561 Current.clear(); 12562 } else { 12563 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12564 } 12565} 12566 12567 12568void Sema::CheckDelegatingCtorCycles() { 12569 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12570 12571 for (DelegatingCtorDeclsType::iterator 12572 I = DelegatingCtorDecls.begin(ExternalSource), 12573 E = DelegatingCtorDecls.end(); 12574 I != E; ++I) 12575 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12576 12577 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(), 12578 CE = Invalid.end(); 12579 CI != CE; ++CI) 12580 (*CI)->setInvalidDecl(); 12581} 12582 12583namespace { 12584 /// \brief AST visitor that finds references to the 'this' expression. 12585 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12586 Sema &S; 12587 12588 public: 12589 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12590 12591 bool VisitCXXThisExpr(CXXThisExpr *E) { 12592 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12593 << E->isImplicit(); 12594 return false; 12595 } 12596 }; 12597} 12598 12599bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12600 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12601 if (!TSInfo) 12602 return false; 12603 12604 TypeLoc TL = TSInfo->getTypeLoc(); 12605 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12606 if (!ProtoTL) 12607 return false; 12608 12609 // C++11 [expr.prim.general]p3: 12610 // [The expression this] shall not appear before the optional 12611 // cv-qualifier-seq and it shall not appear within the declaration of a 12612 // static member function (although its type and value category are defined 12613 // within a static member function as they are within a non-static member 12614 // function). [ Note: this is because declaration matching does not occur 12615 // until the complete declarator is known. - end note ] 12616 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12617 FindCXXThisExpr Finder(*this); 12618 12619 // If the return type came after the cv-qualifier-seq, check it now. 12620 if (Proto->hasTrailingReturn() && 12621 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12622 return true; 12623 12624 // Check the exception specification. 12625 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12626 return true; 12627 12628 return checkThisInStaticMemberFunctionAttributes(Method); 12629} 12630 12631bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12632 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12633 if (!TSInfo) 12634 return false; 12635 12636 TypeLoc TL = TSInfo->getTypeLoc(); 12637 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12638 if (!ProtoTL) 12639 return false; 12640 12641 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12642 FindCXXThisExpr Finder(*this); 12643 12644 switch (Proto->getExceptionSpecType()) { 12645 case EST_Uninstantiated: 12646 case EST_Unevaluated: 12647 case EST_BasicNoexcept: 12648 case EST_DynamicNone: 12649 case EST_MSAny: 12650 case EST_None: 12651 break; 12652 12653 case EST_ComputedNoexcept: 12654 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12655 return true; 12656 12657 case EST_Dynamic: 12658 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12659 EEnd = Proto->exception_end(); 12660 E != EEnd; ++E) { 12661 if (!Finder.TraverseType(*E)) 12662 return true; 12663 } 12664 break; 12665 } 12666 12667 return false; 12668} 12669 12670bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12671 FindCXXThisExpr Finder(*this); 12672 12673 // Check attributes. 12674 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12675 A != AEnd; ++A) { 12676 // FIXME: This should be emitted by tblgen. 12677 Expr *Arg = 0; 12678 ArrayRef<Expr *> Args; 12679 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12680 Arg = G->getArg(); 12681 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12682 Arg = G->getArg(); 12683 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12684 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12685 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12686 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12687 else if (ExclusiveLockFunctionAttr *ELF 12688 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12689 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12690 else if (SharedLockFunctionAttr *SLF 12691 = dyn_cast<SharedLockFunctionAttr>(*A)) 12692 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12693 else if (ExclusiveTrylockFunctionAttr *ETLF 12694 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12695 Arg = ETLF->getSuccessValue(); 12696 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12697 } else if (SharedTrylockFunctionAttr *STLF 12698 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12699 Arg = STLF->getSuccessValue(); 12700 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12701 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12702 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12703 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12704 Arg = LR->getArg(); 12705 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12706 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12707 else if (ExclusiveLocksRequiredAttr *ELR 12708 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12709 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12710 else if (SharedLocksRequiredAttr *SLR 12711 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12712 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12713 12714 if (Arg && !Finder.TraverseStmt(Arg)) 12715 return true; 12716 12717 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12718 if (!Finder.TraverseStmt(Args[I])) 12719 return true; 12720 } 12721 } 12722 12723 return false; 12724} 12725 12726void 12727Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12728 ArrayRef<ParsedType> DynamicExceptions, 12729 ArrayRef<SourceRange> DynamicExceptionRanges, 12730 Expr *NoexceptExpr, 12731 SmallVectorImpl<QualType> &Exceptions, 12732 FunctionProtoType::ExtProtoInfo &EPI) { 12733 Exceptions.clear(); 12734 EPI.ExceptionSpecType = EST; 12735 if (EST == EST_Dynamic) { 12736 Exceptions.reserve(DynamicExceptions.size()); 12737 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12738 // FIXME: Preserve type source info. 12739 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12740 12741 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12742 collectUnexpandedParameterPacks(ET, Unexpanded); 12743 if (!Unexpanded.empty()) { 12744 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12745 UPPC_ExceptionType, 12746 Unexpanded); 12747 continue; 12748 } 12749 12750 // Check that the type is valid for an exception spec, and 12751 // drop it if not. 12752 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12753 Exceptions.push_back(ET); 12754 } 12755 EPI.NumExceptions = Exceptions.size(); 12756 EPI.Exceptions = Exceptions.data(); 12757 return; 12758 } 12759 12760 if (EST == EST_ComputedNoexcept) { 12761 // If an error occurred, there's no expression here. 12762 if (NoexceptExpr) { 12763 assert((NoexceptExpr->isTypeDependent() || 12764 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12765 Context.BoolTy) && 12766 "Parser should have made sure that the expression is boolean"); 12767 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12768 EPI.ExceptionSpecType = EST_BasicNoexcept; 12769 return; 12770 } 12771 12772 if (!NoexceptExpr->isValueDependent()) 12773 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12774 diag::err_noexcept_needs_constant_expression, 12775 /*AllowFold*/ false).take(); 12776 EPI.NoexceptExpr = NoexceptExpr; 12777 } 12778 return; 12779 } 12780} 12781 12782/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12783Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12784 // Implicitly declared functions (e.g. copy constructors) are 12785 // __host__ __device__ 12786 if (D->isImplicit()) 12787 return CFT_HostDevice; 12788 12789 if (D->hasAttr<CUDAGlobalAttr>()) 12790 return CFT_Global; 12791 12792 if (D->hasAttr<CUDADeviceAttr>()) { 12793 if (D->hasAttr<CUDAHostAttr>()) 12794 return CFT_HostDevice; 12795 return CFT_Device; 12796 } 12797 12798 return CFT_Host; 12799} 12800 12801bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12802 CUDAFunctionTarget CalleeTarget) { 12803 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12804 // Callable from the device only." 12805 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12806 return true; 12807 12808 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12809 // Callable from the host only." 12810 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12811 // Callable from the host only." 12812 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12813 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12814 return true; 12815 12816 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12817 return true; 12818 12819 return false; 12820} 12821 12822/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12823/// 12824MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12825 SourceLocation DeclStart, 12826 Declarator &D, Expr *BitWidth, 12827 InClassInitStyle InitStyle, 12828 AccessSpecifier AS, 12829 AttributeList *MSPropertyAttr) { 12830 IdentifierInfo *II = D.getIdentifier(); 12831 if (!II) { 12832 Diag(DeclStart, diag::err_anonymous_property); 12833 return NULL; 12834 } 12835 SourceLocation Loc = D.getIdentifierLoc(); 12836 12837 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12838 QualType T = TInfo->getType(); 12839 if (getLangOpts().CPlusPlus) { 12840 CheckExtraCXXDefaultArguments(D); 12841 12842 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12843 UPPC_DataMemberType)) { 12844 D.setInvalidType(); 12845 T = Context.IntTy; 12846 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12847 } 12848 } 12849 12850 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12851 12852 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12853 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12854 diag::err_invalid_thread) 12855 << DeclSpec::getSpecifierName(TSCS); 12856 12857 // Check to see if this name was declared as a member previously 12858 NamedDecl *PrevDecl = 0; 12859 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12860 LookupName(Previous, S); 12861 switch (Previous.getResultKind()) { 12862 case LookupResult::Found: 12863 case LookupResult::FoundUnresolvedValue: 12864 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12865 break; 12866 12867 case LookupResult::FoundOverloaded: 12868 PrevDecl = Previous.getRepresentativeDecl(); 12869 break; 12870 12871 case LookupResult::NotFound: 12872 case LookupResult::NotFoundInCurrentInstantiation: 12873 case LookupResult::Ambiguous: 12874 break; 12875 } 12876 12877 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12878 // Maybe we will complain about the shadowed template parameter. 12879 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12880 // Just pretend that we didn't see the previous declaration. 12881 PrevDecl = 0; 12882 } 12883 12884 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12885 PrevDecl = 0; 12886 12887 SourceLocation TSSL = D.getLocStart(); 12888 MSPropertyDecl *NewPD; 12889 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12890 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12891 II, T, TInfo, TSSL, 12892 Data.GetterId, Data.SetterId); 12893 ProcessDeclAttributes(TUScope, NewPD, D); 12894 NewPD->setAccess(AS); 12895 12896 if (NewPD->isInvalidDecl()) 12897 Record->setInvalidDecl(); 12898 12899 if (D.getDeclSpec().isModulePrivateSpecified()) 12900 NewPD->setModulePrivate(); 12901 12902 if (NewPD->isInvalidDecl() && PrevDecl) { 12903 // Don't introduce NewFD into scope; there's already something 12904 // with the same name in the same scope. 12905 } else if (II) { 12906 PushOnScopeChains(NewPD, S); 12907 } else 12908 Record->addDecl(NewPD); 12909 12910 return NewPD; 12911} 12912