SemaDeclCXX.cpp revision fad9e13f3cb85198f0ee5af620ba81cd78574faa
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 // Declare inheriting constructors. We do this eagerly here because: 4455 // - The standard requires an eager diagnostic for conflicting inheriting 4456 // constructors from different classes. 4457 // - The lazy declaration of the other implicit constructors is so as to not 4458 // waste space and performance on classes that are not meant to be 4459 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4460 // have inheriting constructors. 4461 DeclareInheritingConstructors(Record); 4462} 4463 4464/// Is the special member function which would be selected to perform the 4465/// specified operation on the specified class type a constexpr constructor? 4466static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4467 Sema::CXXSpecialMember CSM, 4468 bool ConstArg) { 4469 Sema::SpecialMemberOverloadResult *SMOR = 4470 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4471 false, false, false, false); 4472 if (!SMOR || !SMOR->getMethod()) 4473 // A constructor we wouldn't select can't be "involved in initializing" 4474 // anything. 4475 return true; 4476 return SMOR->getMethod()->isConstexpr(); 4477} 4478 4479/// Determine whether the specified special member function would be constexpr 4480/// if it were implicitly defined. 4481static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4482 Sema::CXXSpecialMember CSM, 4483 bool ConstArg) { 4484 if (!S.getLangOpts().CPlusPlus11) 4485 return false; 4486 4487 // C++11 [dcl.constexpr]p4: 4488 // In the definition of a constexpr constructor [...] 4489 bool Ctor = true; 4490 switch (CSM) { 4491 case Sema::CXXDefaultConstructor: 4492 // Since default constructor lookup is essentially trivial (and cannot 4493 // involve, for instance, template instantiation), we compute whether a 4494 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4495 // 4496 // This is important for performance; we need to know whether the default 4497 // constructor is constexpr to determine whether the type is a literal type. 4498 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4499 4500 case Sema::CXXCopyConstructor: 4501 case Sema::CXXMoveConstructor: 4502 // For copy or move constructors, we need to perform overload resolution. 4503 break; 4504 4505 case Sema::CXXCopyAssignment: 4506 case Sema::CXXMoveAssignment: 4507 if (!S.getLangOpts().CPlusPlus1y) 4508 return false; 4509 // In C++1y, we need to perform overload resolution. 4510 Ctor = false; 4511 break; 4512 4513 case Sema::CXXDestructor: 4514 case Sema::CXXInvalid: 4515 return false; 4516 } 4517 4518 // -- if the class is a non-empty union, or for each non-empty anonymous 4519 // union member of a non-union class, exactly one non-static data member 4520 // shall be initialized; [DR1359] 4521 // 4522 // If we squint, this is guaranteed, since exactly one non-static data member 4523 // will be initialized (if the constructor isn't deleted), we just don't know 4524 // which one. 4525 if (Ctor && ClassDecl->isUnion()) 4526 return true; 4527 4528 // -- the class shall not have any virtual base classes; 4529 if (Ctor && ClassDecl->getNumVBases()) 4530 return false; 4531 4532 // C++1y [class.copy]p26: 4533 // -- [the class] is a literal type, and 4534 if (!Ctor && !ClassDecl->isLiteral()) 4535 return false; 4536 4537 // -- every constructor involved in initializing [...] base class 4538 // sub-objects shall be a constexpr constructor; 4539 // -- the assignment operator selected to copy/move each direct base 4540 // class is a constexpr function, and 4541 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4542 BEnd = ClassDecl->bases_end(); 4543 B != BEnd; ++B) { 4544 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4545 if (!BaseType) continue; 4546 4547 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4548 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4549 return false; 4550 } 4551 4552 // -- every constructor involved in initializing non-static data members 4553 // [...] shall be a constexpr constructor; 4554 // -- every non-static data member and base class sub-object shall be 4555 // initialized 4556 // -- for each non-stastic data member of X that is of class type (or array 4557 // thereof), the assignment operator selected to copy/move that member is 4558 // a constexpr function 4559 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4560 FEnd = ClassDecl->field_end(); 4561 F != FEnd; ++F) { 4562 if (F->isInvalidDecl()) 4563 continue; 4564 if (const RecordType *RecordTy = 4565 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4566 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4567 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4568 return false; 4569 } 4570 } 4571 4572 // All OK, it's constexpr! 4573 return true; 4574} 4575 4576static Sema::ImplicitExceptionSpecification 4577computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4578 switch (S.getSpecialMember(MD)) { 4579 case Sema::CXXDefaultConstructor: 4580 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4581 case Sema::CXXCopyConstructor: 4582 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4583 case Sema::CXXCopyAssignment: 4584 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4585 case Sema::CXXMoveConstructor: 4586 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4587 case Sema::CXXMoveAssignment: 4588 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4589 case Sema::CXXDestructor: 4590 return S.ComputeDefaultedDtorExceptionSpec(MD); 4591 case Sema::CXXInvalid: 4592 break; 4593 } 4594 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4595 "only special members have implicit exception specs"); 4596 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4597} 4598 4599static void 4600updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4601 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4602 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4603 ExceptSpec.getEPI(EPI); 4604 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4605 FPT->getArgTypes(), EPI)); 4606} 4607 4608static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, 4609 CXXMethodDecl *MD) { 4610 FunctionProtoType::ExtProtoInfo EPI; 4611 4612 // Build an exception specification pointing back at this member. 4613 EPI.ExceptionSpecType = EST_Unevaluated; 4614 EPI.ExceptionSpecDecl = MD; 4615 4616 // Set the calling convention to the default for C++ instance methods. 4617 EPI.ExtInfo = EPI.ExtInfo.withCallingConv( 4618 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4619 /*IsCXXMethod=*/true)); 4620 return EPI; 4621} 4622 4623void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4624 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4625 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4626 return; 4627 4628 // Evaluate the exception specification. 4629 ImplicitExceptionSpecification ExceptSpec = 4630 computeImplicitExceptionSpec(*this, Loc, MD); 4631 4632 // Update the type of the special member to use it. 4633 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4634 4635 // A user-provided destructor can be defined outside the class. When that 4636 // happens, be sure to update the exception specification on both 4637 // declarations. 4638 const FunctionProtoType *CanonicalFPT = 4639 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4640 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4641 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4642 CanonicalFPT, ExceptSpec); 4643} 4644 4645void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4646 CXXRecordDecl *RD = MD->getParent(); 4647 CXXSpecialMember CSM = getSpecialMember(MD); 4648 4649 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4650 "not an explicitly-defaulted special member"); 4651 4652 // Whether this was the first-declared instance of the constructor. 4653 // This affects whether we implicitly add an exception spec and constexpr. 4654 bool First = MD == MD->getCanonicalDecl(); 4655 4656 bool HadError = false; 4657 4658 // C++11 [dcl.fct.def.default]p1: 4659 // A function that is explicitly defaulted shall 4660 // -- be a special member function (checked elsewhere), 4661 // -- have the same type (except for ref-qualifiers, and except that a 4662 // copy operation can take a non-const reference) as an implicit 4663 // declaration, and 4664 // -- not have default arguments. 4665 unsigned ExpectedParams = 1; 4666 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4667 ExpectedParams = 0; 4668 if (MD->getNumParams() != ExpectedParams) { 4669 // This also checks for default arguments: a copy or move constructor with a 4670 // default argument is classified as a default constructor, and assignment 4671 // operations and destructors can't have default arguments. 4672 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4673 << CSM << MD->getSourceRange(); 4674 HadError = true; 4675 } else if (MD->isVariadic()) { 4676 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4677 << CSM << MD->getSourceRange(); 4678 HadError = true; 4679 } 4680 4681 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4682 4683 bool CanHaveConstParam = false; 4684 if (CSM == CXXCopyConstructor) 4685 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4686 else if (CSM == CXXCopyAssignment) 4687 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4688 4689 QualType ReturnType = Context.VoidTy; 4690 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4691 // Check for return type matching. 4692 ReturnType = Type->getResultType(); 4693 QualType ExpectedReturnType = 4694 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4695 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4696 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4697 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4698 HadError = true; 4699 } 4700 4701 // A defaulted special member cannot have cv-qualifiers. 4702 if (Type->getTypeQuals()) { 4703 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4704 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4705 HadError = true; 4706 } 4707 } 4708 4709 // Check for parameter type matching. 4710 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4711 bool HasConstParam = false; 4712 if (ExpectedParams && ArgType->isReferenceType()) { 4713 // Argument must be reference to possibly-const T. 4714 QualType ReferentType = ArgType->getPointeeType(); 4715 HasConstParam = ReferentType.isConstQualified(); 4716 4717 if (ReferentType.isVolatileQualified()) { 4718 Diag(MD->getLocation(), 4719 diag::err_defaulted_special_member_volatile_param) << CSM; 4720 HadError = true; 4721 } 4722 4723 if (HasConstParam && !CanHaveConstParam) { 4724 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4725 Diag(MD->getLocation(), 4726 diag::err_defaulted_special_member_copy_const_param) 4727 << (CSM == CXXCopyAssignment); 4728 // FIXME: Explain why this special member can't be const. 4729 } else { 4730 Diag(MD->getLocation(), 4731 diag::err_defaulted_special_member_move_const_param) 4732 << (CSM == CXXMoveAssignment); 4733 } 4734 HadError = true; 4735 } 4736 } else if (ExpectedParams) { 4737 // A copy assignment operator can take its argument by value, but a 4738 // defaulted one cannot. 4739 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4740 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4741 HadError = true; 4742 } 4743 4744 // C++11 [dcl.fct.def.default]p2: 4745 // An explicitly-defaulted function may be declared constexpr only if it 4746 // would have been implicitly declared as constexpr, 4747 // Do not apply this rule to members of class templates, since core issue 1358 4748 // makes such functions always instantiate to constexpr functions. For 4749 // functions which cannot be constexpr (for non-constructors in C++11 and for 4750 // destructors in C++1y), this is checked elsewhere. 4751 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4752 HasConstParam); 4753 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4754 : isa<CXXConstructorDecl>(MD)) && 4755 MD->isConstexpr() && !Constexpr && 4756 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4757 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4758 // FIXME: Explain why the special member can't be constexpr. 4759 HadError = true; 4760 } 4761 4762 // and may have an explicit exception-specification only if it is compatible 4763 // with the exception-specification on the implicit declaration. 4764 if (Type->hasExceptionSpec()) { 4765 // Delay the check if this is the first declaration of the special member, 4766 // since we may not have parsed some necessary in-class initializers yet. 4767 if (First) { 4768 // If the exception specification needs to be instantiated, do so now, 4769 // before we clobber it with an EST_Unevaluated specification below. 4770 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4771 InstantiateExceptionSpec(MD->getLocStart(), MD); 4772 Type = MD->getType()->getAs<FunctionProtoType>(); 4773 } 4774 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4775 } else 4776 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4777 } 4778 4779 // If a function is explicitly defaulted on its first declaration, 4780 if (First) { 4781 // -- it is implicitly considered to be constexpr if the implicit 4782 // definition would be, 4783 MD->setConstexpr(Constexpr); 4784 4785 // -- it is implicitly considered to have the same exception-specification 4786 // as if it had been implicitly declared, 4787 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4788 EPI.ExceptionSpecType = EST_Unevaluated; 4789 EPI.ExceptionSpecDecl = MD; 4790 MD->setType(Context.getFunctionType(ReturnType, 4791 ArrayRef<QualType>(&ArgType, 4792 ExpectedParams), 4793 EPI)); 4794 } 4795 4796 if (ShouldDeleteSpecialMember(MD, CSM)) { 4797 if (First) { 4798 SetDeclDeleted(MD, MD->getLocation()); 4799 } else { 4800 // C++11 [dcl.fct.def.default]p4: 4801 // [For a] user-provided explicitly-defaulted function [...] if such a 4802 // function is implicitly defined as deleted, the program is ill-formed. 4803 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4804 HadError = true; 4805 } 4806 } 4807 4808 if (HadError) 4809 MD->setInvalidDecl(); 4810} 4811 4812/// Check whether the exception specification provided for an 4813/// explicitly-defaulted special member matches the exception specification 4814/// that would have been generated for an implicit special member, per 4815/// C++11 [dcl.fct.def.default]p2. 4816void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4817 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4818 // Compute the implicit exception specification. 4819 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4820 /*IsCXXMethod=*/true); 4821 FunctionProtoType::ExtProtoInfo EPI(CC); 4822 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4823 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4824 Context.getFunctionType(Context.VoidTy, None, EPI)); 4825 4826 // Ensure that it matches. 4827 CheckEquivalentExceptionSpec( 4828 PDiag(diag::err_incorrect_defaulted_exception_spec) 4829 << getSpecialMember(MD), PDiag(), 4830 ImplicitType, SourceLocation(), 4831 SpecifiedType, MD->getLocation()); 4832} 4833 4834void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4835 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4836 I != N; ++I) 4837 CheckExplicitlyDefaultedMemberExceptionSpec( 4838 DelayedDefaultedMemberExceptionSpecs[I].first, 4839 DelayedDefaultedMemberExceptionSpecs[I].second); 4840 4841 DelayedDefaultedMemberExceptionSpecs.clear(); 4842} 4843 4844namespace { 4845struct SpecialMemberDeletionInfo { 4846 Sema &S; 4847 CXXMethodDecl *MD; 4848 Sema::CXXSpecialMember CSM; 4849 bool Diagnose; 4850 4851 // Properties of the special member, computed for convenience. 4852 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4853 SourceLocation Loc; 4854 4855 bool AllFieldsAreConst; 4856 4857 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4858 Sema::CXXSpecialMember CSM, bool Diagnose) 4859 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4860 IsConstructor(false), IsAssignment(false), IsMove(false), 4861 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4862 AllFieldsAreConst(true) { 4863 switch (CSM) { 4864 case Sema::CXXDefaultConstructor: 4865 case Sema::CXXCopyConstructor: 4866 IsConstructor = true; 4867 break; 4868 case Sema::CXXMoveConstructor: 4869 IsConstructor = true; 4870 IsMove = true; 4871 break; 4872 case Sema::CXXCopyAssignment: 4873 IsAssignment = true; 4874 break; 4875 case Sema::CXXMoveAssignment: 4876 IsAssignment = true; 4877 IsMove = true; 4878 break; 4879 case Sema::CXXDestructor: 4880 break; 4881 case Sema::CXXInvalid: 4882 llvm_unreachable("invalid special member kind"); 4883 } 4884 4885 if (MD->getNumParams()) { 4886 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4887 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4888 } 4889 } 4890 4891 bool inUnion() const { return MD->getParent()->isUnion(); } 4892 4893 /// Look up the corresponding special member in the given class. 4894 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4895 unsigned Quals) { 4896 unsigned TQ = MD->getTypeQualifiers(); 4897 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4898 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4899 Quals = 0; 4900 return S.LookupSpecialMember(Class, CSM, 4901 ConstArg || (Quals & Qualifiers::Const), 4902 VolatileArg || (Quals & Qualifiers::Volatile), 4903 MD->getRefQualifier() == RQ_RValue, 4904 TQ & Qualifiers::Const, 4905 TQ & Qualifiers::Volatile); 4906 } 4907 4908 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4909 4910 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4911 bool shouldDeleteForField(FieldDecl *FD); 4912 bool shouldDeleteForAllConstMembers(); 4913 4914 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4915 unsigned Quals); 4916 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4917 Sema::SpecialMemberOverloadResult *SMOR, 4918 bool IsDtorCallInCtor); 4919 4920 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4921}; 4922} 4923 4924/// Is the given special member inaccessible when used on the given 4925/// sub-object. 4926bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4927 CXXMethodDecl *target) { 4928 /// If we're operating on a base class, the object type is the 4929 /// type of this special member. 4930 QualType objectTy; 4931 AccessSpecifier access = target->getAccess(); 4932 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4933 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4934 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4935 4936 // If we're operating on a field, the object type is the type of the field. 4937 } else { 4938 objectTy = S.Context.getTypeDeclType(target->getParent()); 4939 } 4940 4941 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4942} 4943 4944/// Check whether we should delete a special member due to the implicit 4945/// definition containing a call to a special member of a subobject. 4946bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4947 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4948 bool IsDtorCallInCtor) { 4949 CXXMethodDecl *Decl = SMOR->getMethod(); 4950 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4951 4952 int DiagKind = -1; 4953 4954 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4955 DiagKind = !Decl ? 0 : 1; 4956 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4957 DiagKind = 2; 4958 else if (!isAccessible(Subobj, Decl)) 4959 DiagKind = 3; 4960 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4961 !Decl->isTrivial()) { 4962 // A member of a union must have a trivial corresponding special member. 4963 // As a weird special case, a destructor call from a union's constructor 4964 // must be accessible and non-deleted, but need not be trivial. Such a 4965 // destructor is never actually called, but is semantically checked as 4966 // if it were. 4967 DiagKind = 4; 4968 } 4969 4970 if (DiagKind == -1) 4971 return false; 4972 4973 if (Diagnose) { 4974 if (Field) { 4975 S.Diag(Field->getLocation(), 4976 diag::note_deleted_special_member_class_subobject) 4977 << CSM << MD->getParent() << /*IsField*/true 4978 << Field << DiagKind << IsDtorCallInCtor; 4979 } else { 4980 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4981 S.Diag(Base->getLocStart(), 4982 diag::note_deleted_special_member_class_subobject) 4983 << CSM << MD->getParent() << /*IsField*/false 4984 << Base->getType() << DiagKind << IsDtorCallInCtor; 4985 } 4986 4987 if (DiagKind == 1) 4988 S.NoteDeletedFunction(Decl); 4989 // FIXME: Explain inaccessibility if DiagKind == 3. 4990 } 4991 4992 return true; 4993} 4994 4995/// Check whether we should delete a special member function due to having a 4996/// direct or virtual base class or non-static data member of class type M. 4997bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4998 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4999 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 5000 5001 // C++11 [class.ctor]p5: 5002 // -- any direct or virtual base class, or non-static data member with no 5003 // brace-or-equal-initializer, has class type M (or array thereof) and 5004 // either M has no default constructor or overload resolution as applied 5005 // to M's default constructor results in an ambiguity or in a function 5006 // that is deleted or inaccessible 5007 // C++11 [class.copy]p11, C++11 [class.copy]p23: 5008 // -- a direct or virtual base class B that cannot be copied/moved because 5009 // overload resolution, as applied to B's corresponding special member, 5010 // results in an ambiguity or a function that is deleted or inaccessible 5011 // from the defaulted special member 5012 // C++11 [class.dtor]p5: 5013 // -- any direct or virtual base class [...] has a type with a destructor 5014 // that is deleted or inaccessible 5015 if (!(CSM == Sema::CXXDefaultConstructor && 5016 Field && Field->hasInClassInitializer()) && 5017 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 5018 return true; 5019 5020 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 5021 // -- any direct or virtual base class or non-static data member has a 5022 // type with a destructor that is deleted or inaccessible 5023 if (IsConstructor) { 5024 Sema::SpecialMemberOverloadResult *SMOR = 5025 S.LookupSpecialMember(Class, Sema::CXXDestructor, 5026 false, false, false, false, false); 5027 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 5028 return true; 5029 } 5030 5031 return false; 5032} 5033 5034/// Check whether we should delete a special member function due to the class 5035/// having a particular direct or virtual base class. 5036bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 5037 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 5038 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 5039} 5040 5041/// Check whether we should delete a special member function due to the class 5042/// having a particular non-static data member. 5043bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 5044 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 5045 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 5046 5047 if (CSM == Sema::CXXDefaultConstructor) { 5048 // For a default constructor, all references must be initialized in-class 5049 // and, if a union, it must have a non-const member. 5050 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 5051 if (Diagnose) 5052 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 5053 << MD->getParent() << FD << FieldType << /*Reference*/0; 5054 return true; 5055 } 5056 // C++11 [class.ctor]p5: any non-variant non-static data member of 5057 // const-qualified type (or array thereof) with no 5058 // brace-or-equal-initializer does not have a user-provided default 5059 // constructor. 5060 if (!inUnion() && FieldType.isConstQualified() && 5061 !FD->hasInClassInitializer() && 5062 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 5063 if (Diagnose) 5064 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 5065 << MD->getParent() << FD << FD->getType() << /*Const*/1; 5066 return true; 5067 } 5068 5069 if (inUnion() && !FieldType.isConstQualified()) 5070 AllFieldsAreConst = false; 5071 } else if (CSM == Sema::CXXCopyConstructor) { 5072 // For a copy constructor, data members must not be of rvalue reference 5073 // type. 5074 if (FieldType->isRValueReferenceType()) { 5075 if (Diagnose) 5076 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 5077 << MD->getParent() << FD << FieldType; 5078 return true; 5079 } 5080 } else if (IsAssignment) { 5081 // For an assignment operator, data members must not be of reference type. 5082 if (FieldType->isReferenceType()) { 5083 if (Diagnose) 5084 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 5085 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 5086 return true; 5087 } 5088 if (!FieldRecord && FieldType.isConstQualified()) { 5089 // C++11 [class.copy]p23: 5090 // -- a non-static data member of const non-class type (or array thereof) 5091 if (Diagnose) 5092 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 5093 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 5094 return true; 5095 } 5096 } 5097 5098 if (FieldRecord) { 5099 // Some additional restrictions exist on the variant members. 5100 if (!inUnion() && FieldRecord->isUnion() && 5101 FieldRecord->isAnonymousStructOrUnion()) { 5102 bool AllVariantFieldsAreConst = true; 5103 5104 // FIXME: Handle anonymous unions declared within anonymous unions. 5105 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 5106 UE = FieldRecord->field_end(); 5107 UI != UE; ++UI) { 5108 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 5109 5110 if (!UnionFieldType.isConstQualified()) 5111 AllVariantFieldsAreConst = false; 5112 5113 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 5114 if (UnionFieldRecord && 5115 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 5116 UnionFieldType.getCVRQualifiers())) 5117 return true; 5118 } 5119 5120 // At least one member in each anonymous union must be non-const 5121 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 5122 FieldRecord->field_begin() != FieldRecord->field_end()) { 5123 if (Diagnose) 5124 S.Diag(FieldRecord->getLocation(), 5125 diag::note_deleted_default_ctor_all_const) 5126 << MD->getParent() << /*anonymous union*/1; 5127 return true; 5128 } 5129 5130 // Don't check the implicit member of the anonymous union type. 5131 // This is technically non-conformant, but sanity demands it. 5132 return false; 5133 } 5134 5135 if (shouldDeleteForClassSubobject(FieldRecord, FD, 5136 FieldType.getCVRQualifiers())) 5137 return true; 5138 } 5139 5140 return false; 5141} 5142 5143/// C++11 [class.ctor] p5: 5144/// A defaulted default constructor for a class X is defined as deleted if 5145/// X is a union and all of its variant members are of const-qualified type. 5146bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 5147 // This is a silly definition, because it gives an empty union a deleted 5148 // default constructor. Don't do that. 5149 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 5150 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 5151 if (Diagnose) 5152 S.Diag(MD->getParent()->getLocation(), 5153 diag::note_deleted_default_ctor_all_const) 5154 << MD->getParent() << /*not anonymous union*/0; 5155 return true; 5156 } 5157 return false; 5158} 5159 5160/// Determine whether a defaulted special member function should be defined as 5161/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 5162/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 5163bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 5164 bool Diagnose) { 5165 if (MD->isInvalidDecl()) 5166 return false; 5167 CXXRecordDecl *RD = MD->getParent(); 5168 assert(!RD->isDependentType() && "do deletion after instantiation"); 5169 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 5170 return false; 5171 5172 // C++11 [expr.lambda.prim]p19: 5173 // The closure type associated with a lambda-expression has a 5174 // deleted (8.4.3) default constructor and a deleted copy 5175 // assignment operator. 5176 if (RD->isLambda() && 5177 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 5178 if (Diagnose) 5179 Diag(RD->getLocation(), diag::note_lambda_decl); 5180 return true; 5181 } 5182 5183 // For an anonymous struct or union, the copy and assignment special members 5184 // will never be used, so skip the check. For an anonymous union declared at 5185 // namespace scope, the constructor and destructor are used. 5186 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 5187 RD->isAnonymousStructOrUnion()) 5188 return false; 5189 5190 // C++11 [class.copy]p7, p18: 5191 // If the class definition declares a move constructor or move assignment 5192 // operator, an implicitly declared copy constructor or copy assignment 5193 // operator is defined as deleted. 5194 if (MD->isImplicit() && 5195 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 5196 CXXMethodDecl *UserDeclaredMove = 0; 5197 5198 // In Microsoft mode, a user-declared move only causes the deletion of the 5199 // corresponding copy operation, not both copy operations. 5200 if (RD->hasUserDeclaredMoveConstructor() && 5201 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 5202 if (!Diagnose) return true; 5203 5204 // Find any user-declared move constructor. 5205 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 5206 E = RD->ctor_end(); I != E; ++I) { 5207 if (I->isMoveConstructor()) { 5208 UserDeclaredMove = *I; 5209 break; 5210 } 5211 } 5212 assert(UserDeclaredMove); 5213 } else if (RD->hasUserDeclaredMoveAssignment() && 5214 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 5215 if (!Diagnose) return true; 5216 5217 // Find any user-declared move assignment operator. 5218 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 5219 E = RD->method_end(); I != E; ++I) { 5220 if (I->isMoveAssignmentOperator()) { 5221 UserDeclaredMove = *I; 5222 break; 5223 } 5224 } 5225 assert(UserDeclaredMove); 5226 } 5227 5228 if (UserDeclaredMove) { 5229 Diag(UserDeclaredMove->getLocation(), 5230 diag::note_deleted_copy_user_declared_move) 5231 << (CSM == CXXCopyAssignment) << RD 5232 << UserDeclaredMove->isMoveAssignmentOperator(); 5233 return true; 5234 } 5235 } 5236 5237 // Do access control from the special member function 5238 ContextRAII MethodContext(*this, MD); 5239 5240 // C++11 [class.dtor]p5: 5241 // -- for a virtual destructor, lookup of the non-array deallocation function 5242 // results in an ambiguity or in a function that is deleted or inaccessible 5243 if (CSM == CXXDestructor && MD->isVirtual()) { 5244 FunctionDecl *OperatorDelete = 0; 5245 DeclarationName Name = 5246 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5247 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5248 OperatorDelete, false)) { 5249 if (Diagnose) 5250 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5251 return true; 5252 } 5253 } 5254 5255 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5256 5257 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5258 BE = RD->bases_end(); BI != BE; ++BI) 5259 if (!BI->isVirtual() && 5260 SMI.shouldDeleteForBase(BI)) 5261 return true; 5262 5263 // Per DR1611, do not consider virtual bases of constructors of abstract 5264 // classes, since we are not going to construct them. 5265 if (!RD->isAbstract() || !SMI.IsConstructor) { 5266 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5267 BE = RD->vbases_end(); 5268 BI != BE; ++BI) 5269 if (SMI.shouldDeleteForBase(BI)) 5270 return true; 5271 } 5272 5273 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5274 FE = RD->field_end(); FI != FE; ++FI) 5275 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5276 SMI.shouldDeleteForField(*FI)) 5277 return true; 5278 5279 if (SMI.shouldDeleteForAllConstMembers()) 5280 return true; 5281 5282 return false; 5283} 5284 5285/// Perform lookup for a special member of the specified kind, and determine 5286/// whether it is trivial. If the triviality can be determined without the 5287/// lookup, skip it. This is intended for use when determining whether a 5288/// special member of a containing object is trivial, and thus does not ever 5289/// perform overload resolution for default constructors. 5290/// 5291/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5292/// member that was most likely to be intended to be trivial, if any. 5293static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5294 Sema::CXXSpecialMember CSM, unsigned Quals, 5295 CXXMethodDecl **Selected) { 5296 if (Selected) 5297 *Selected = 0; 5298 5299 switch (CSM) { 5300 case Sema::CXXInvalid: 5301 llvm_unreachable("not a special member"); 5302 5303 case Sema::CXXDefaultConstructor: 5304 // C++11 [class.ctor]p5: 5305 // A default constructor is trivial if: 5306 // - all the [direct subobjects] have trivial default constructors 5307 // 5308 // Note, no overload resolution is performed in this case. 5309 if (RD->hasTrivialDefaultConstructor()) 5310 return true; 5311 5312 if (Selected) { 5313 // If there's a default constructor which could have been trivial, dig it 5314 // out. Otherwise, if there's any user-provided default constructor, point 5315 // to that as an example of why there's not a trivial one. 5316 CXXConstructorDecl *DefCtor = 0; 5317 if (RD->needsImplicitDefaultConstructor()) 5318 S.DeclareImplicitDefaultConstructor(RD); 5319 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5320 CE = RD->ctor_end(); CI != CE; ++CI) { 5321 if (!CI->isDefaultConstructor()) 5322 continue; 5323 DefCtor = *CI; 5324 if (!DefCtor->isUserProvided()) 5325 break; 5326 } 5327 5328 *Selected = DefCtor; 5329 } 5330 5331 return false; 5332 5333 case Sema::CXXDestructor: 5334 // C++11 [class.dtor]p5: 5335 // A destructor is trivial if: 5336 // - all the direct [subobjects] have trivial destructors 5337 if (RD->hasTrivialDestructor()) 5338 return true; 5339 5340 if (Selected) { 5341 if (RD->needsImplicitDestructor()) 5342 S.DeclareImplicitDestructor(RD); 5343 *Selected = RD->getDestructor(); 5344 } 5345 5346 return false; 5347 5348 case Sema::CXXCopyConstructor: 5349 // C++11 [class.copy]p12: 5350 // A copy constructor is trivial if: 5351 // - the constructor selected to copy each direct [subobject] is trivial 5352 if (RD->hasTrivialCopyConstructor()) { 5353 if (Quals == Qualifiers::Const) 5354 // We must either select the trivial copy constructor or reach an 5355 // ambiguity; no need to actually perform overload resolution. 5356 return true; 5357 } else if (!Selected) { 5358 return false; 5359 } 5360 // In C++98, we are not supposed to perform overload resolution here, but we 5361 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5362 // cases like B as having a non-trivial copy constructor: 5363 // struct A { template<typename T> A(T&); }; 5364 // struct B { mutable A a; }; 5365 goto NeedOverloadResolution; 5366 5367 case Sema::CXXCopyAssignment: 5368 // C++11 [class.copy]p25: 5369 // A copy assignment operator is trivial if: 5370 // - the assignment operator selected to copy each direct [subobject] is 5371 // trivial 5372 if (RD->hasTrivialCopyAssignment()) { 5373 if (Quals == Qualifiers::Const) 5374 return true; 5375 } else if (!Selected) { 5376 return false; 5377 } 5378 // In C++98, we are not supposed to perform overload resolution here, but we 5379 // treat that as a language defect. 5380 goto NeedOverloadResolution; 5381 5382 case Sema::CXXMoveConstructor: 5383 case Sema::CXXMoveAssignment: 5384 NeedOverloadResolution: 5385 Sema::SpecialMemberOverloadResult *SMOR = 5386 S.LookupSpecialMember(RD, CSM, 5387 Quals & Qualifiers::Const, 5388 Quals & Qualifiers::Volatile, 5389 /*RValueThis*/false, /*ConstThis*/false, 5390 /*VolatileThis*/false); 5391 5392 // The standard doesn't describe how to behave if the lookup is ambiguous. 5393 // We treat it as not making the member non-trivial, just like the standard 5394 // mandates for the default constructor. This should rarely matter, because 5395 // the member will also be deleted. 5396 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5397 return true; 5398 5399 if (!SMOR->getMethod()) { 5400 assert(SMOR->getKind() == 5401 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5402 return false; 5403 } 5404 5405 // We deliberately don't check if we found a deleted special member. We're 5406 // not supposed to! 5407 if (Selected) 5408 *Selected = SMOR->getMethod(); 5409 return SMOR->getMethod()->isTrivial(); 5410 } 5411 5412 llvm_unreachable("unknown special method kind"); 5413} 5414 5415static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5416 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5417 CI != CE; ++CI) 5418 if (!CI->isImplicit()) 5419 return *CI; 5420 5421 // Look for constructor templates. 5422 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5423 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5424 if (CXXConstructorDecl *CD = 5425 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5426 return CD; 5427 } 5428 5429 return 0; 5430} 5431 5432/// The kind of subobject we are checking for triviality. The values of this 5433/// enumeration are used in diagnostics. 5434enum TrivialSubobjectKind { 5435 /// The subobject is a base class. 5436 TSK_BaseClass, 5437 /// The subobject is a non-static data member. 5438 TSK_Field, 5439 /// The object is actually the complete object. 5440 TSK_CompleteObject 5441}; 5442 5443/// Check whether the special member selected for a given type would be trivial. 5444static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5445 QualType SubType, 5446 Sema::CXXSpecialMember CSM, 5447 TrivialSubobjectKind Kind, 5448 bool Diagnose) { 5449 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5450 if (!SubRD) 5451 return true; 5452 5453 CXXMethodDecl *Selected; 5454 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5455 Diagnose ? &Selected : 0)) 5456 return true; 5457 5458 if (Diagnose) { 5459 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5460 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5461 << Kind << SubType.getUnqualifiedType(); 5462 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5463 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5464 } else if (!Selected) 5465 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5466 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5467 else if (Selected->isUserProvided()) { 5468 if (Kind == TSK_CompleteObject) 5469 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5470 << Kind << SubType.getUnqualifiedType() << CSM; 5471 else { 5472 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5473 << Kind << SubType.getUnqualifiedType() << CSM; 5474 S.Diag(Selected->getLocation(), diag::note_declared_at); 5475 } 5476 } else { 5477 if (Kind != TSK_CompleteObject) 5478 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5479 << Kind << SubType.getUnqualifiedType() << CSM; 5480 5481 // Explain why the defaulted or deleted special member isn't trivial. 5482 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5483 } 5484 } 5485 5486 return false; 5487} 5488 5489/// Check whether the members of a class type allow a special member to be 5490/// trivial. 5491static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5492 Sema::CXXSpecialMember CSM, 5493 bool ConstArg, bool Diagnose) { 5494 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5495 FE = RD->field_end(); FI != FE; ++FI) { 5496 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5497 continue; 5498 5499 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5500 5501 // Pretend anonymous struct or union members are members of this class. 5502 if (FI->isAnonymousStructOrUnion()) { 5503 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5504 CSM, ConstArg, Diagnose)) 5505 return false; 5506 continue; 5507 } 5508 5509 // C++11 [class.ctor]p5: 5510 // A default constructor is trivial if [...] 5511 // -- no non-static data member of its class has a 5512 // brace-or-equal-initializer 5513 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5514 if (Diagnose) 5515 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5516 return false; 5517 } 5518 5519 // Objective C ARC 4.3.5: 5520 // [...] nontrivally ownership-qualified types are [...] not trivially 5521 // default constructible, copy constructible, move constructible, copy 5522 // assignable, move assignable, or destructible [...] 5523 if (S.getLangOpts().ObjCAutoRefCount && 5524 FieldType.hasNonTrivialObjCLifetime()) { 5525 if (Diagnose) 5526 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5527 << RD << FieldType.getObjCLifetime(); 5528 return false; 5529 } 5530 5531 if (ConstArg && !FI->isMutable()) 5532 FieldType.addConst(); 5533 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5534 TSK_Field, Diagnose)) 5535 return false; 5536 } 5537 5538 return true; 5539} 5540 5541/// Diagnose why the specified class does not have a trivial special member of 5542/// the given kind. 5543void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5544 QualType Ty = Context.getRecordType(RD); 5545 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5546 Ty.addConst(); 5547 5548 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5549 TSK_CompleteObject, /*Diagnose*/true); 5550} 5551 5552/// Determine whether a defaulted or deleted special member function is trivial, 5553/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5554/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5555bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5556 bool Diagnose) { 5557 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5558 5559 CXXRecordDecl *RD = MD->getParent(); 5560 5561 bool ConstArg = false; 5562 5563 // C++11 [class.copy]p12, p25: 5564 // A [special member] is trivial if its declared parameter type is the same 5565 // as if it had been implicitly declared [...] 5566 switch (CSM) { 5567 case CXXDefaultConstructor: 5568 case CXXDestructor: 5569 // Trivial default constructors and destructors cannot have parameters. 5570 break; 5571 5572 case CXXCopyConstructor: 5573 case CXXCopyAssignment: { 5574 // Trivial copy operations always have const, non-volatile parameter types. 5575 ConstArg = true; 5576 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5577 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5578 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5579 if (Diagnose) 5580 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5581 << Param0->getSourceRange() << Param0->getType() 5582 << Context.getLValueReferenceType( 5583 Context.getRecordType(RD).withConst()); 5584 return false; 5585 } 5586 break; 5587 } 5588 5589 case CXXMoveConstructor: 5590 case CXXMoveAssignment: { 5591 // Trivial move operations always have non-cv-qualified parameters. 5592 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5593 const RValueReferenceType *RT = 5594 Param0->getType()->getAs<RValueReferenceType>(); 5595 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5596 if (Diagnose) 5597 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5598 << Param0->getSourceRange() << Param0->getType() 5599 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5600 return false; 5601 } 5602 break; 5603 } 5604 5605 case CXXInvalid: 5606 llvm_unreachable("not a special member"); 5607 } 5608 5609 // FIXME: We require that the parameter-declaration-clause is equivalent to 5610 // that of an implicit declaration, not just that the declared parameter type 5611 // matches, in order to prevent absuridities like a function simultaneously 5612 // being a trivial copy constructor and a non-trivial default constructor. 5613 // This issue has not yet been assigned a core issue number. 5614 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5615 if (Diagnose) 5616 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5617 diag::note_nontrivial_default_arg) 5618 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5619 return false; 5620 } 5621 if (MD->isVariadic()) { 5622 if (Diagnose) 5623 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5624 return false; 5625 } 5626 5627 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5628 // A copy/move [constructor or assignment operator] is trivial if 5629 // -- the [member] selected to copy/move each direct base class subobject 5630 // is trivial 5631 // 5632 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5633 // A [default constructor or destructor] is trivial if 5634 // -- all the direct base classes have trivial [default constructors or 5635 // destructors] 5636 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5637 BE = RD->bases_end(); BI != BE; ++BI) 5638 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5639 ConstArg ? BI->getType().withConst() 5640 : BI->getType(), 5641 CSM, TSK_BaseClass, Diagnose)) 5642 return false; 5643 5644 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5645 // A copy/move [constructor or assignment operator] for a class X is 5646 // trivial if 5647 // -- for each non-static data member of X that is of class type (or array 5648 // thereof), the constructor selected to copy/move that member is 5649 // trivial 5650 // 5651 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5652 // A [default constructor or destructor] is trivial if 5653 // -- for all of the non-static data members of its class that are of class 5654 // type (or array thereof), each such class has a trivial [default 5655 // constructor or destructor] 5656 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5657 return false; 5658 5659 // C++11 [class.dtor]p5: 5660 // A destructor is trivial if [...] 5661 // -- the destructor is not virtual 5662 if (CSM == CXXDestructor && MD->isVirtual()) { 5663 if (Diagnose) 5664 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5665 return false; 5666 } 5667 5668 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5669 // A [special member] for class X is trivial if [...] 5670 // -- class X has no virtual functions and no virtual base classes 5671 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5672 if (!Diagnose) 5673 return false; 5674 5675 if (RD->getNumVBases()) { 5676 // Check for virtual bases. We already know that the corresponding 5677 // member in all bases is trivial, so vbases must all be direct. 5678 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5679 assert(BS.isVirtual()); 5680 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5681 return false; 5682 } 5683 5684 // Must have a virtual method. 5685 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5686 ME = RD->method_end(); MI != ME; ++MI) { 5687 if (MI->isVirtual()) { 5688 SourceLocation MLoc = MI->getLocStart(); 5689 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5690 return false; 5691 } 5692 } 5693 5694 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5695 } 5696 5697 // Looks like it's trivial! 5698 return true; 5699} 5700 5701/// \brief Data used with FindHiddenVirtualMethod 5702namespace { 5703 struct FindHiddenVirtualMethodData { 5704 Sema *S; 5705 CXXMethodDecl *Method; 5706 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5707 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5708 }; 5709} 5710 5711/// \brief Check whether any most overriden method from MD in Methods 5712static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5713 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5714 if (MD->size_overridden_methods() == 0) 5715 return Methods.count(MD->getCanonicalDecl()); 5716 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5717 E = MD->end_overridden_methods(); 5718 I != E; ++I) 5719 if (CheckMostOverridenMethods(*I, Methods)) 5720 return true; 5721 return false; 5722} 5723 5724/// \brief Member lookup function that determines whether a given C++ 5725/// method overloads virtual methods in a base class without overriding any, 5726/// to be used with CXXRecordDecl::lookupInBases(). 5727static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5728 CXXBasePath &Path, 5729 void *UserData) { 5730 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5731 5732 FindHiddenVirtualMethodData &Data 5733 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5734 5735 DeclarationName Name = Data.Method->getDeclName(); 5736 assert(Name.getNameKind() == DeclarationName::Identifier); 5737 5738 bool foundSameNameMethod = false; 5739 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5740 for (Path.Decls = BaseRecord->lookup(Name); 5741 !Path.Decls.empty(); 5742 Path.Decls = Path.Decls.slice(1)) { 5743 NamedDecl *D = Path.Decls.front(); 5744 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5745 MD = MD->getCanonicalDecl(); 5746 foundSameNameMethod = true; 5747 // Interested only in hidden virtual methods. 5748 if (!MD->isVirtual()) 5749 continue; 5750 // If the method we are checking overrides a method from its base 5751 // don't warn about the other overloaded methods. 5752 if (!Data.S->IsOverload(Data.Method, MD, false)) 5753 return true; 5754 // Collect the overload only if its hidden. 5755 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5756 overloadedMethods.push_back(MD); 5757 } 5758 } 5759 5760 if (foundSameNameMethod) 5761 Data.OverloadedMethods.append(overloadedMethods.begin(), 5762 overloadedMethods.end()); 5763 return foundSameNameMethod; 5764} 5765 5766/// \brief Add the most overriden methods from MD to Methods 5767static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5768 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5769 if (MD->size_overridden_methods() == 0) 5770 Methods.insert(MD->getCanonicalDecl()); 5771 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5772 E = MD->end_overridden_methods(); 5773 I != E; ++I) 5774 AddMostOverridenMethods(*I, Methods); 5775} 5776 5777/// \brief Check if a method overloads virtual methods in a base class without 5778/// overriding any. 5779void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, 5780 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5781 if (!MD->getDeclName().isIdentifier()) 5782 return; 5783 5784 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5785 /*bool RecordPaths=*/false, 5786 /*bool DetectVirtual=*/false); 5787 FindHiddenVirtualMethodData Data; 5788 Data.Method = MD; 5789 Data.S = this; 5790 5791 // Keep the base methods that were overriden or introduced in the subclass 5792 // by 'using' in a set. A base method not in this set is hidden. 5793 CXXRecordDecl *DC = MD->getParent(); 5794 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5795 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5796 NamedDecl *ND = *I; 5797 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5798 ND = shad->getTargetDecl(); 5799 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5800 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5801 } 5802 5803 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths)) 5804 OverloadedMethods = Data.OverloadedMethods; 5805} 5806 5807void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, 5808 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5809 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { 5810 CXXMethodDecl *overloadedMD = OverloadedMethods[i]; 5811 PartialDiagnostic PD = PDiag( 5812 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5813 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5814 Diag(overloadedMD->getLocation(), PD); 5815 } 5816} 5817 5818/// \brief Diagnose methods which overload virtual methods in a base class 5819/// without overriding any. 5820void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { 5821 if (MD->isInvalidDecl()) 5822 return; 5823 5824 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5825 MD->getLocation()) == DiagnosticsEngine::Ignored) 5826 return; 5827 5828 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5829 FindHiddenVirtualMethods(MD, OverloadedMethods); 5830 if (!OverloadedMethods.empty()) { 5831 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5832 << MD << (OverloadedMethods.size() > 1); 5833 5834 NoteHiddenVirtualMethods(MD, OverloadedMethods); 5835 } 5836} 5837 5838void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5839 Decl *TagDecl, 5840 SourceLocation LBrac, 5841 SourceLocation RBrac, 5842 AttributeList *AttrList) { 5843 if (!TagDecl) 5844 return; 5845 5846 AdjustDeclIfTemplate(TagDecl); 5847 5848 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5849 if (l->getKind() != AttributeList::AT_Visibility) 5850 continue; 5851 l->setInvalid(); 5852 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5853 l->getName(); 5854 } 5855 5856 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5857 // strict aliasing violation! 5858 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5859 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5860 5861 CheckCompletedCXXClass( 5862 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5863} 5864 5865/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5866/// special functions, such as the default constructor, copy 5867/// constructor, or destructor, to the given C++ class (C++ 5868/// [special]p1). This routine can only be executed just before the 5869/// definition of the class is complete. 5870void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5871 if (!ClassDecl->hasUserDeclaredConstructor()) 5872 ++ASTContext::NumImplicitDefaultConstructors; 5873 5874 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5875 ++ASTContext::NumImplicitCopyConstructors; 5876 5877 // If the properties or semantics of the copy constructor couldn't be 5878 // determined while the class was being declared, force a declaration 5879 // of it now. 5880 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5881 DeclareImplicitCopyConstructor(ClassDecl); 5882 } 5883 5884 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5885 ++ASTContext::NumImplicitMoveConstructors; 5886 5887 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5888 DeclareImplicitMoveConstructor(ClassDecl); 5889 } 5890 5891 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5892 ++ASTContext::NumImplicitCopyAssignmentOperators; 5893 5894 // If we have a dynamic class, then the copy assignment operator may be 5895 // virtual, so we have to declare it immediately. This ensures that, e.g., 5896 // it shows up in the right place in the vtable and that we diagnose 5897 // problems with the implicit exception specification. 5898 if (ClassDecl->isDynamicClass() || 5899 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5900 DeclareImplicitCopyAssignment(ClassDecl); 5901 } 5902 5903 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5904 ++ASTContext::NumImplicitMoveAssignmentOperators; 5905 5906 // Likewise for the move assignment operator. 5907 if (ClassDecl->isDynamicClass() || 5908 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5909 DeclareImplicitMoveAssignment(ClassDecl); 5910 } 5911 5912 if (!ClassDecl->hasUserDeclaredDestructor()) { 5913 ++ASTContext::NumImplicitDestructors; 5914 5915 // If we have a dynamic class, then the destructor may be virtual, so we 5916 // have to declare the destructor immediately. This ensures that, e.g., it 5917 // shows up in the right place in the vtable and that we diagnose problems 5918 // with the implicit exception specification. 5919 if (ClassDecl->isDynamicClass() || 5920 ClassDecl->needsOverloadResolutionForDestructor()) 5921 DeclareImplicitDestructor(ClassDecl); 5922 } 5923} 5924 5925void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5926 if (!D) 5927 return; 5928 5929 int NumParamList = D->getNumTemplateParameterLists(); 5930 for (int i = 0; i < NumParamList; i++) { 5931 TemplateParameterList* Params = D->getTemplateParameterList(i); 5932 for (TemplateParameterList::iterator Param = Params->begin(), 5933 ParamEnd = Params->end(); 5934 Param != ParamEnd; ++Param) { 5935 NamedDecl *Named = cast<NamedDecl>(*Param); 5936 if (Named->getDeclName()) { 5937 S->AddDecl(Named); 5938 IdResolver.AddDecl(Named); 5939 } 5940 } 5941 } 5942} 5943 5944void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5945 if (!D) 5946 return; 5947 5948 TemplateParameterList *Params = 0; 5949 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5950 Params = Template->getTemplateParameters(); 5951 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5952 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5953 Params = PartialSpec->getTemplateParameters(); 5954 else 5955 return; 5956 5957 for (TemplateParameterList::iterator Param = Params->begin(), 5958 ParamEnd = Params->end(); 5959 Param != ParamEnd; ++Param) { 5960 NamedDecl *Named = cast<NamedDecl>(*Param); 5961 if (Named->getDeclName()) { 5962 S->AddDecl(Named); 5963 IdResolver.AddDecl(Named); 5964 } 5965 } 5966} 5967 5968void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5969 if (!RecordD) return; 5970 AdjustDeclIfTemplate(RecordD); 5971 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5972 PushDeclContext(S, Record); 5973} 5974 5975void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5976 if (!RecordD) return; 5977 PopDeclContext(); 5978} 5979 5980/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5981/// parsing a top-level (non-nested) C++ class, and we are now 5982/// parsing those parts of the given Method declaration that could 5983/// not be parsed earlier (C++ [class.mem]p2), such as default 5984/// arguments. This action should enter the scope of the given 5985/// Method declaration as if we had just parsed the qualified method 5986/// name. However, it should not bring the parameters into scope; 5987/// that will be performed by ActOnDelayedCXXMethodParameter. 5988void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5989} 5990 5991/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5992/// C++ method declaration. We're (re-)introducing the given 5993/// function parameter into scope for use in parsing later parts of 5994/// the method declaration. For example, we could see an 5995/// ActOnParamDefaultArgument event for this parameter. 5996void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5997 if (!ParamD) 5998 return; 5999 6000 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 6001 6002 // If this parameter has an unparsed default argument, clear it out 6003 // to make way for the parsed default argument. 6004 if (Param->hasUnparsedDefaultArg()) 6005 Param->setDefaultArg(0); 6006 6007 S->AddDecl(Param); 6008 if (Param->getDeclName()) 6009 IdResolver.AddDecl(Param); 6010} 6011 6012/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 6013/// processing the delayed method declaration for Method. The method 6014/// declaration is now considered finished. There may be a separate 6015/// ActOnStartOfFunctionDef action later (not necessarily 6016/// immediately!) for this method, if it was also defined inside the 6017/// class body. 6018void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 6019 if (!MethodD) 6020 return; 6021 6022 AdjustDeclIfTemplate(MethodD); 6023 6024 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 6025 6026 // Now that we have our default arguments, check the constructor 6027 // again. It could produce additional diagnostics or affect whether 6028 // the class has implicitly-declared destructors, among other 6029 // things. 6030 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 6031 CheckConstructor(Constructor); 6032 6033 // Check the default arguments, which we may have added. 6034 if (!Method->isInvalidDecl()) 6035 CheckCXXDefaultArguments(Method); 6036} 6037 6038/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 6039/// the well-formedness of the constructor declarator @p D with type @p 6040/// R. If there are any errors in the declarator, this routine will 6041/// emit diagnostics and set the invalid bit to true. In any case, the type 6042/// will be updated to reflect a well-formed type for the constructor and 6043/// returned. 6044QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 6045 StorageClass &SC) { 6046 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 6047 6048 // C++ [class.ctor]p3: 6049 // A constructor shall not be virtual (10.3) or static (9.4). A 6050 // constructor can be invoked for a const, volatile or const 6051 // volatile object. A constructor shall not be declared const, 6052 // volatile, or const volatile (9.3.2). 6053 if (isVirtual) { 6054 if (!D.isInvalidType()) 6055 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 6056 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 6057 << SourceRange(D.getIdentifierLoc()); 6058 D.setInvalidType(); 6059 } 6060 if (SC == SC_Static) { 6061 if (!D.isInvalidType()) 6062 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 6063 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6064 << SourceRange(D.getIdentifierLoc()); 6065 D.setInvalidType(); 6066 SC = SC_None; 6067 } 6068 6069 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6070 if (FTI.TypeQuals != 0) { 6071 if (FTI.TypeQuals & Qualifiers::Const) 6072 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6073 << "const" << SourceRange(D.getIdentifierLoc()); 6074 if (FTI.TypeQuals & Qualifiers::Volatile) 6075 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6076 << "volatile" << SourceRange(D.getIdentifierLoc()); 6077 if (FTI.TypeQuals & Qualifiers::Restrict) 6078 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6079 << "restrict" << SourceRange(D.getIdentifierLoc()); 6080 D.setInvalidType(); 6081 } 6082 6083 // C++0x [class.ctor]p4: 6084 // A constructor shall not be declared with a ref-qualifier. 6085 if (FTI.hasRefQualifier()) { 6086 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 6087 << FTI.RefQualifierIsLValueRef 6088 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6089 D.setInvalidType(); 6090 } 6091 6092 // Rebuild the function type "R" without any type qualifiers (in 6093 // case any of the errors above fired) and with "void" as the 6094 // return type, since constructors don't have return types. 6095 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6096 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 6097 return R; 6098 6099 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6100 EPI.TypeQuals = 0; 6101 EPI.RefQualifier = RQ_None; 6102 6103 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 6104} 6105 6106/// CheckConstructor - Checks a fully-formed constructor for 6107/// well-formedness, issuing any diagnostics required. Returns true if 6108/// the constructor declarator is invalid. 6109void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 6110 CXXRecordDecl *ClassDecl 6111 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 6112 if (!ClassDecl) 6113 return Constructor->setInvalidDecl(); 6114 6115 // C++ [class.copy]p3: 6116 // A declaration of a constructor for a class X is ill-formed if 6117 // its first parameter is of type (optionally cv-qualified) X and 6118 // either there are no other parameters or else all other 6119 // parameters have default arguments. 6120 if (!Constructor->isInvalidDecl() && 6121 ((Constructor->getNumParams() == 1) || 6122 (Constructor->getNumParams() > 1 && 6123 Constructor->getParamDecl(1)->hasDefaultArg())) && 6124 Constructor->getTemplateSpecializationKind() 6125 != TSK_ImplicitInstantiation) { 6126 QualType ParamType = Constructor->getParamDecl(0)->getType(); 6127 QualType ClassTy = Context.getTagDeclType(ClassDecl); 6128 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 6129 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 6130 const char *ConstRef 6131 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 6132 : " const &"; 6133 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 6134 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 6135 6136 // FIXME: Rather that making the constructor invalid, we should endeavor 6137 // to fix the type. 6138 Constructor->setInvalidDecl(); 6139 } 6140 } 6141} 6142 6143/// CheckDestructor - Checks a fully-formed destructor definition for 6144/// well-formedness, issuing any diagnostics required. Returns true 6145/// on error. 6146bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 6147 CXXRecordDecl *RD = Destructor->getParent(); 6148 6149 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 6150 SourceLocation Loc; 6151 6152 if (!Destructor->isImplicit()) 6153 Loc = Destructor->getLocation(); 6154 else 6155 Loc = RD->getLocation(); 6156 6157 // If we have a virtual destructor, look up the deallocation function 6158 FunctionDecl *OperatorDelete = 0; 6159 DeclarationName Name = 6160 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 6161 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 6162 return true; 6163 6164 MarkFunctionReferenced(Loc, OperatorDelete); 6165 6166 Destructor->setOperatorDelete(OperatorDelete); 6167 } 6168 6169 return false; 6170} 6171 6172static inline bool 6173FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 6174 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 6175 FTI.ArgInfo[0].Param && 6176 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 6177} 6178 6179/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 6180/// the well-formednes of the destructor declarator @p D with type @p 6181/// R. If there are any errors in the declarator, this routine will 6182/// emit diagnostics and set the declarator to invalid. Even if this happens, 6183/// will be updated to reflect a well-formed type for the destructor and 6184/// returned. 6185QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 6186 StorageClass& SC) { 6187 // C++ [class.dtor]p1: 6188 // [...] A typedef-name that names a class is a class-name 6189 // (7.1.3); however, a typedef-name that names a class shall not 6190 // be used as the identifier in the declarator for a destructor 6191 // declaration. 6192 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 6193 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 6194 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6195 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 6196 else if (const TemplateSpecializationType *TST = 6197 DeclaratorType->getAs<TemplateSpecializationType>()) 6198 if (TST->isTypeAlias()) 6199 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6200 << DeclaratorType << 1; 6201 6202 // C++ [class.dtor]p2: 6203 // A destructor is used to destroy objects of its class type. A 6204 // destructor takes no parameters, and no return type can be 6205 // specified for it (not even void). The address of a destructor 6206 // shall not be taken. A destructor shall not be static. A 6207 // destructor can be invoked for a const, volatile or const 6208 // volatile object. A destructor shall not be declared const, 6209 // volatile or const volatile (9.3.2). 6210 if (SC == SC_Static) { 6211 if (!D.isInvalidType()) 6212 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 6213 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6214 << SourceRange(D.getIdentifierLoc()) 6215 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 6216 6217 SC = SC_None; 6218 } 6219 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6220 // Destructors don't have return types, but the parser will 6221 // happily parse something like: 6222 // 6223 // class X { 6224 // float ~X(); 6225 // }; 6226 // 6227 // The return type will be eliminated later. 6228 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 6229 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6230 << SourceRange(D.getIdentifierLoc()); 6231 } 6232 6233 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6234 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 6235 if (FTI.TypeQuals & Qualifiers::Const) 6236 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6237 << "const" << SourceRange(D.getIdentifierLoc()); 6238 if (FTI.TypeQuals & Qualifiers::Volatile) 6239 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6240 << "volatile" << SourceRange(D.getIdentifierLoc()); 6241 if (FTI.TypeQuals & Qualifiers::Restrict) 6242 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6243 << "restrict" << SourceRange(D.getIdentifierLoc()); 6244 D.setInvalidType(); 6245 } 6246 6247 // C++0x [class.dtor]p2: 6248 // A destructor shall not be declared with a ref-qualifier. 6249 if (FTI.hasRefQualifier()) { 6250 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6251 << FTI.RefQualifierIsLValueRef 6252 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6253 D.setInvalidType(); 6254 } 6255 6256 // Make sure we don't have any parameters. 6257 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6258 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6259 6260 // Delete the parameters. 6261 FTI.freeArgs(); 6262 D.setInvalidType(); 6263 } 6264 6265 // Make sure the destructor isn't variadic. 6266 if (FTI.isVariadic) { 6267 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6268 D.setInvalidType(); 6269 } 6270 6271 // Rebuild the function type "R" without any type qualifiers or 6272 // parameters (in case any of the errors above fired) and with 6273 // "void" as the return type, since destructors don't have return 6274 // types. 6275 if (!D.isInvalidType()) 6276 return R; 6277 6278 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6279 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6280 EPI.Variadic = false; 6281 EPI.TypeQuals = 0; 6282 EPI.RefQualifier = RQ_None; 6283 return Context.getFunctionType(Context.VoidTy, None, EPI); 6284} 6285 6286/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6287/// well-formednes of the conversion function declarator @p D with 6288/// type @p R. If there are any errors in the declarator, this routine 6289/// will emit diagnostics and return true. Otherwise, it will return 6290/// false. Either way, the type @p R will be updated to reflect a 6291/// well-formed type for the conversion operator. 6292void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6293 StorageClass& SC) { 6294 // C++ [class.conv.fct]p1: 6295 // Neither parameter types nor return type can be specified. The 6296 // type of a conversion function (8.3.5) is "function taking no 6297 // parameter returning conversion-type-id." 6298 if (SC == SC_Static) { 6299 if (!D.isInvalidType()) 6300 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6301 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6302 << D.getName().getSourceRange(); 6303 D.setInvalidType(); 6304 SC = SC_None; 6305 } 6306 6307 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6308 6309 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6310 // Conversion functions don't have return types, but the parser will 6311 // happily parse something like: 6312 // 6313 // class X { 6314 // float operator bool(); 6315 // }; 6316 // 6317 // The return type will be changed later anyway. 6318 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6319 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6320 << SourceRange(D.getIdentifierLoc()); 6321 D.setInvalidType(); 6322 } 6323 6324 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6325 6326 // Make sure we don't have any parameters. 6327 if (Proto->getNumArgs() > 0) { 6328 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6329 6330 // Delete the parameters. 6331 D.getFunctionTypeInfo().freeArgs(); 6332 D.setInvalidType(); 6333 } else if (Proto->isVariadic()) { 6334 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6335 D.setInvalidType(); 6336 } 6337 6338 // Diagnose "&operator bool()" and other such nonsense. This 6339 // is actually a gcc extension which we don't support. 6340 if (Proto->getResultType() != ConvType) { 6341 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6342 << Proto->getResultType(); 6343 D.setInvalidType(); 6344 ConvType = Proto->getResultType(); 6345 } 6346 6347 // C++ [class.conv.fct]p4: 6348 // The conversion-type-id shall not represent a function type nor 6349 // an array type. 6350 if (ConvType->isArrayType()) { 6351 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6352 ConvType = Context.getPointerType(ConvType); 6353 D.setInvalidType(); 6354 } else if (ConvType->isFunctionType()) { 6355 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6356 ConvType = Context.getPointerType(ConvType); 6357 D.setInvalidType(); 6358 } 6359 6360 // Rebuild the function type "R" without any parameters (in case any 6361 // of the errors above fired) and with the conversion type as the 6362 // return type. 6363 if (D.isInvalidType()) 6364 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6365 6366 // C++0x explicit conversion operators. 6367 if (D.getDeclSpec().isExplicitSpecified()) 6368 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6369 getLangOpts().CPlusPlus11 ? 6370 diag::warn_cxx98_compat_explicit_conversion_functions : 6371 diag::ext_explicit_conversion_functions) 6372 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6373} 6374 6375/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6376/// the declaration of the given C++ conversion function. This routine 6377/// is responsible for recording the conversion function in the C++ 6378/// class, if possible. 6379Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6380 assert(Conversion && "Expected to receive a conversion function declaration"); 6381 6382 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6383 6384 // Make sure we aren't redeclaring the conversion function. 6385 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6386 6387 // C++ [class.conv.fct]p1: 6388 // [...] A conversion function is never used to convert a 6389 // (possibly cv-qualified) object to the (possibly cv-qualified) 6390 // same object type (or a reference to it), to a (possibly 6391 // cv-qualified) base class of that type (or a reference to it), 6392 // or to (possibly cv-qualified) void. 6393 // FIXME: Suppress this warning if the conversion function ends up being a 6394 // virtual function that overrides a virtual function in a base class. 6395 QualType ClassType 6396 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6397 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6398 ConvType = ConvTypeRef->getPointeeType(); 6399 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6400 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6401 /* Suppress diagnostics for instantiations. */; 6402 else if (ConvType->isRecordType()) { 6403 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6404 if (ConvType == ClassType) 6405 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6406 << ClassType; 6407 else if (IsDerivedFrom(ClassType, ConvType)) 6408 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6409 << ClassType << ConvType; 6410 } else if (ConvType->isVoidType()) { 6411 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6412 << ClassType << ConvType; 6413 } 6414 6415 if (FunctionTemplateDecl *ConversionTemplate 6416 = Conversion->getDescribedFunctionTemplate()) 6417 return ConversionTemplate; 6418 6419 return Conversion; 6420} 6421 6422//===----------------------------------------------------------------------===// 6423// Namespace Handling 6424//===----------------------------------------------------------------------===// 6425 6426/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6427/// reopened. 6428static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6429 SourceLocation Loc, 6430 IdentifierInfo *II, bool *IsInline, 6431 NamespaceDecl *PrevNS) { 6432 assert(*IsInline != PrevNS->isInline()); 6433 6434 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6435 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6436 // inline namespaces, with the intention of bringing names into namespace std. 6437 // 6438 // We support this just well enough to get that case working; this is not 6439 // sufficient to support reopening namespaces as inline in general. 6440 if (*IsInline && II && II->getName().startswith("__atomic") && 6441 S.getSourceManager().isInSystemHeader(Loc)) { 6442 // Mark all prior declarations of the namespace as inline. 6443 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6444 NS = NS->getPreviousDecl()) 6445 NS->setInline(*IsInline); 6446 // Patch up the lookup table for the containing namespace. This isn't really 6447 // correct, but it's good enough for this particular case. 6448 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6449 E = PrevNS->decls_end(); I != E; ++I) 6450 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6451 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6452 return; 6453 } 6454 6455 if (PrevNS->isInline()) 6456 // The user probably just forgot the 'inline', so suggest that it 6457 // be added back. 6458 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6459 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6460 else 6461 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6462 << IsInline; 6463 6464 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6465 *IsInline = PrevNS->isInline(); 6466} 6467 6468/// ActOnStartNamespaceDef - This is called at the start of a namespace 6469/// definition. 6470Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6471 SourceLocation InlineLoc, 6472 SourceLocation NamespaceLoc, 6473 SourceLocation IdentLoc, 6474 IdentifierInfo *II, 6475 SourceLocation LBrace, 6476 AttributeList *AttrList) { 6477 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6478 // For anonymous namespace, take the location of the left brace. 6479 SourceLocation Loc = II ? IdentLoc : LBrace; 6480 bool IsInline = InlineLoc.isValid(); 6481 bool IsInvalid = false; 6482 bool IsStd = false; 6483 bool AddToKnown = false; 6484 Scope *DeclRegionScope = NamespcScope->getParent(); 6485 6486 NamespaceDecl *PrevNS = 0; 6487 if (II) { 6488 // C++ [namespace.def]p2: 6489 // The identifier in an original-namespace-definition shall not 6490 // have been previously defined in the declarative region in 6491 // which the original-namespace-definition appears. The 6492 // identifier in an original-namespace-definition is the name of 6493 // the namespace. Subsequently in that declarative region, it is 6494 // treated as an original-namespace-name. 6495 // 6496 // Since namespace names are unique in their scope, and we don't 6497 // look through using directives, just look for any ordinary names. 6498 6499 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6500 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6501 Decl::IDNS_Namespace; 6502 NamedDecl *PrevDecl = 0; 6503 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6504 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6505 ++I) { 6506 if ((*I)->getIdentifierNamespace() & IDNS) { 6507 PrevDecl = *I; 6508 break; 6509 } 6510 } 6511 6512 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6513 6514 if (PrevNS) { 6515 // This is an extended namespace definition. 6516 if (IsInline != PrevNS->isInline()) 6517 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6518 &IsInline, PrevNS); 6519 } else if (PrevDecl) { 6520 // This is an invalid name redefinition. 6521 Diag(Loc, diag::err_redefinition_different_kind) 6522 << II; 6523 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6524 IsInvalid = true; 6525 // Continue on to push Namespc as current DeclContext and return it. 6526 } else if (II->isStr("std") && 6527 CurContext->getRedeclContext()->isTranslationUnit()) { 6528 // This is the first "real" definition of the namespace "std", so update 6529 // our cache of the "std" namespace to point at this definition. 6530 PrevNS = getStdNamespace(); 6531 IsStd = true; 6532 AddToKnown = !IsInline; 6533 } else { 6534 // We've seen this namespace for the first time. 6535 AddToKnown = !IsInline; 6536 } 6537 } else { 6538 // Anonymous namespaces. 6539 6540 // Determine whether the parent already has an anonymous namespace. 6541 DeclContext *Parent = CurContext->getRedeclContext(); 6542 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6543 PrevNS = TU->getAnonymousNamespace(); 6544 } else { 6545 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6546 PrevNS = ND->getAnonymousNamespace(); 6547 } 6548 6549 if (PrevNS && IsInline != PrevNS->isInline()) 6550 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6551 &IsInline, PrevNS); 6552 } 6553 6554 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6555 StartLoc, Loc, II, PrevNS); 6556 if (IsInvalid) 6557 Namespc->setInvalidDecl(); 6558 6559 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6560 6561 // FIXME: Should we be merging attributes? 6562 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6563 PushNamespaceVisibilityAttr(Attr, Loc); 6564 6565 if (IsStd) 6566 StdNamespace = Namespc; 6567 if (AddToKnown) 6568 KnownNamespaces[Namespc] = false; 6569 6570 if (II) { 6571 PushOnScopeChains(Namespc, DeclRegionScope); 6572 } else { 6573 // Link the anonymous namespace into its parent. 6574 DeclContext *Parent = CurContext->getRedeclContext(); 6575 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6576 TU->setAnonymousNamespace(Namespc); 6577 } else { 6578 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6579 } 6580 6581 CurContext->addDecl(Namespc); 6582 6583 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6584 // behaves as if it were replaced by 6585 // namespace unique { /* empty body */ } 6586 // using namespace unique; 6587 // namespace unique { namespace-body } 6588 // where all occurrences of 'unique' in a translation unit are 6589 // replaced by the same identifier and this identifier differs 6590 // from all other identifiers in the entire program. 6591 6592 // We just create the namespace with an empty name and then add an 6593 // implicit using declaration, just like the standard suggests. 6594 // 6595 // CodeGen enforces the "universally unique" aspect by giving all 6596 // declarations semantically contained within an anonymous 6597 // namespace internal linkage. 6598 6599 if (!PrevNS) { 6600 UsingDirectiveDecl* UD 6601 = UsingDirectiveDecl::Create(Context, Parent, 6602 /* 'using' */ LBrace, 6603 /* 'namespace' */ SourceLocation(), 6604 /* qualifier */ NestedNameSpecifierLoc(), 6605 /* identifier */ SourceLocation(), 6606 Namespc, 6607 /* Ancestor */ Parent); 6608 UD->setImplicit(); 6609 Parent->addDecl(UD); 6610 } 6611 } 6612 6613 ActOnDocumentableDecl(Namespc); 6614 6615 // Although we could have an invalid decl (i.e. the namespace name is a 6616 // redefinition), push it as current DeclContext and try to continue parsing. 6617 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6618 // for the namespace has the declarations that showed up in that particular 6619 // namespace definition. 6620 PushDeclContext(NamespcScope, Namespc); 6621 return Namespc; 6622} 6623 6624/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6625/// is a namespace alias, returns the namespace it points to. 6626static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6627 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6628 return AD->getNamespace(); 6629 return dyn_cast_or_null<NamespaceDecl>(D); 6630} 6631 6632/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6633/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6634void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6635 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6636 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6637 Namespc->setRBraceLoc(RBrace); 6638 PopDeclContext(); 6639 if (Namespc->hasAttr<VisibilityAttr>()) 6640 PopPragmaVisibility(true, RBrace); 6641} 6642 6643CXXRecordDecl *Sema::getStdBadAlloc() const { 6644 return cast_or_null<CXXRecordDecl>( 6645 StdBadAlloc.get(Context.getExternalSource())); 6646} 6647 6648NamespaceDecl *Sema::getStdNamespace() const { 6649 return cast_or_null<NamespaceDecl>( 6650 StdNamespace.get(Context.getExternalSource())); 6651} 6652 6653/// \brief Retrieve the special "std" namespace, which may require us to 6654/// implicitly define the namespace. 6655NamespaceDecl *Sema::getOrCreateStdNamespace() { 6656 if (!StdNamespace) { 6657 // The "std" namespace has not yet been defined, so build one implicitly. 6658 StdNamespace = NamespaceDecl::Create(Context, 6659 Context.getTranslationUnitDecl(), 6660 /*Inline=*/false, 6661 SourceLocation(), SourceLocation(), 6662 &PP.getIdentifierTable().get("std"), 6663 /*PrevDecl=*/0); 6664 getStdNamespace()->setImplicit(true); 6665 } 6666 6667 return getStdNamespace(); 6668} 6669 6670bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6671 assert(getLangOpts().CPlusPlus && 6672 "Looking for std::initializer_list outside of C++."); 6673 6674 // We're looking for implicit instantiations of 6675 // template <typename E> class std::initializer_list. 6676 6677 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6678 return false; 6679 6680 ClassTemplateDecl *Template = 0; 6681 const TemplateArgument *Arguments = 0; 6682 6683 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6684 6685 ClassTemplateSpecializationDecl *Specialization = 6686 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6687 if (!Specialization) 6688 return false; 6689 6690 Template = Specialization->getSpecializedTemplate(); 6691 Arguments = Specialization->getTemplateArgs().data(); 6692 } else if (const TemplateSpecializationType *TST = 6693 Ty->getAs<TemplateSpecializationType>()) { 6694 Template = dyn_cast_or_null<ClassTemplateDecl>( 6695 TST->getTemplateName().getAsTemplateDecl()); 6696 Arguments = TST->getArgs(); 6697 } 6698 if (!Template) 6699 return false; 6700 6701 if (!StdInitializerList) { 6702 // Haven't recognized std::initializer_list yet, maybe this is it. 6703 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6704 if (TemplateClass->getIdentifier() != 6705 &PP.getIdentifierTable().get("initializer_list") || 6706 !getStdNamespace()->InEnclosingNamespaceSetOf( 6707 TemplateClass->getDeclContext())) 6708 return false; 6709 // This is a template called std::initializer_list, but is it the right 6710 // template? 6711 TemplateParameterList *Params = Template->getTemplateParameters(); 6712 if (Params->getMinRequiredArguments() != 1) 6713 return false; 6714 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6715 return false; 6716 6717 // It's the right template. 6718 StdInitializerList = Template; 6719 } 6720 6721 if (Template != StdInitializerList) 6722 return false; 6723 6724 // This is an instance of std::initializer_list. Find the argument type. 6725 if (Element) 6726 *Element = Arguments[0].getAsType(); 6727 return true; 6728} 6729 6730static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6731 NamespaceDecl *Std = S.getStdNamespace(); 6732 if (!Std) { 6733 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6734 return 0; 6735 } 6736 6737 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6738 Loc, Sema::LookupOrdinaryName); 6739 if (!S.LookupQualifiedName(Result, Std)) { 6740 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6741 return 0; 6742 } 6743 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6744 if (!Template) { 6745 Result.suppressDiagnostics(); 6746 // We found something weird. Complain about the first thing we found. 6747 NamedDecl *Found = *Result.begin(); 6748 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6749 return 0; 6750 } 6751 6752 // We found some template called std::initializer_list. Now verify that it's 6753 // correct. 6754 TemplateParameterList *Params = Template->getTemplateParameters(); 6755 if (Params->getMinRequiredArguments() != 1 || 6756 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6757 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6758 return 0; 6759 } 6760 6761 return Template; 6762} 6763 6764QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6765 if (!StdInitializerList) { 6766 StdInitializerList = LookupStdInitializerList(*this, Loc); 6767 if (!StdInitializerList) 6768 return QualType(); 6769 } 6770 6771 TemplateArgumentListInfo Args(Loc, Loc); 6772 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6773 Context.getTrivialTypeSourceInfo(Element, 6774 Loc))); 6775 return Context.getCanonicalType( 6776 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6777} 6778 6779bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6780 // C++ [dcl.init.list]p2: 6781 // A constructor is an initializer-list constructor if its first parameter 6782 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6783 // std::initializer_list<E> for some type E, and either there are no other 6784 // parameters or else all other parameters have default arguments. 6785 if (Ctor->getNumParams() < 1 || 6786 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6787 return false; 6788 6789 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6790 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6791 ArgType = RT->getPointeeType().getUnqualifiedType(); 6792 6793 return isStdInitializerList(ArgType, 0); 6794} 6795 6796/// \brief Determine whether a using statement is in a context where it will be 6797/// apply in all contexts. 6798static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6799 switch (CurContext->getDeclKind()) { 6800 case Decl::TranslationUnit: 6801 return true; 6802 case Decl::LinkageSpec: 6803 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6804 default: 6805 return false; 6806 } 6807} 6808 6809namespace { 6810 6811// Callback to only accept typo corrections that are namespaces. 6812class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6813public: 6814 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 6815 if (NamedDecl *ND = candidate.getCorrectionDecl()) 6816 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6817 return false; 6818 } 6819}; 6820 6821} 6822 6823static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6824 CXXScopeSpec &SS, 6825 SourceLocation IdentLoc, 6826 IdentifierInfo *Ident) { 6827 NamespaceValidatorCCC Validator; 6828 R.clear(); 6829 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6830 R.getLookupKind(), Sc, &SS, 6831 Validator)) { 6832 if (DeclContext *DC = S.computeDeclContext(SS, false)) { 6833 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6834 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && 6835 Ident->getName().equals(CorrectedStr); 6836 S.diagnoseTypo(Corrected, 6837 S.PDiag(diag::err_using_directive_member_suggest) 6838 << Ident << DC << DroppedSpecifier << SS.getRange(), 6839 S.PDiag(diag::note_namespace_defined_here)); 6840 } else { 6841 S.diagnoseTypo(Corrected, 6842 S.PDiag(diag::err_using_directive_suggest) << Ident, 6843 S.PDiag(diag::note_namespace_defined_here)); 6844 } 6845 R.addDecl(Corrected.getCorrectionDecl()); 6846 return true; 6847 } 6848 return false; 6849} 6850 6851Decl *Sema::ActOnUsingDirective(Scope *S, 6852 SourceLocation UsingLoc, 6853 SourceLocation NamespcLoc, 6854 CXXScopeSpec &SS, 6855 SourceLocation IdentLoc, 6856 IdentifierInfo *NamespcName, 6857 AttributeList *AttrList) { 6858 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6859 assert(NamespcName && "Invalid NamespcName."); 6860 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6861 6862 // This can only happen along a recovery path. 6863 while (S->getFlags() & Scope::TemplateParamScope) 6864 S = S->getParent(); 6865 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6866 6867 UsingDirectiveDecl *UDir = 0; 6868 NestedNameSpecifier *Qualifier = 0; 6869 if (SS.isSet()) 6870 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6871 6872 // Lookup namespace name. 6873 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6874 LookupParsedName(R, S, &SS); 6875 if (R.isAmbiguous()) 6876 return 0; 6877 6878 if (R.empty()) { 6879 R.clear(); 6880 // Allow "using namespace std;" or "using namespace ::std;" even if 6881 // "std" hasn't been defined yet, for GCC compatibility. 6882 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6883 NamespcName->isStr("std")) { 6884 Diag(IdentLoc, diag::ext_using_undefined_std); 6885 R.addDecl(getOrCreateStdNamespace()); 6886 R.resolveKind(); 6887 } 6888 // Otherwise, attempt typo correction. 6889 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6890 } 6891 6892 if (!R.empty()) { 6893 NamedDecl *Named = R.getFoundDecl(); 6894 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6895 && "expected namespace decl"); 6896 // C++ [namespace.udir]p1: 6897 // A using-directive specifies that the names in the nominated 6898 // namespace can be used in the scope in which the 6899 // using-directive appears after the using-directive. During 6900 // unqualified name lookup (3.4.1), the names appear as if they 6901 // were declared in the nearest enclosing namespace which 6902 // contains both the using-directive and the nominated 6903 // namespace. [Note: in this context, "contains" means "contains 6904 // directly or indirectly". ] 6905 6906 // Find enclosing context containing both using-directive and 6907 // nominated namespace. 6908 NamespaceDecl *NS = getNamespaceDecl(Named); 6909 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6910 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6911 CommonAncestor = CommonAncestor->getParent(); 6912 6913 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6914 SS.getWithLocInContext(Context), 6915 IdentLoc, Named, CommonAncestor); 6916 6917 if (IsUsingDirectiveInToplevelContext(CurContext) && 6918 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6919 Diag(IdentLoc, diag::warn_using_directive_in_header); 6920 } 6921 6922 PushUsingDirective(S, UDir); 6923 } else { 6924 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6925 } 6926 6927 if (UDir) 6928 ProcessDeclAttributeList(S, UDir, AttrList); 6929 6930 return UDir; 6931} 6932 6933void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6934 // If the scope has an associated entity and the using directive is at 6935 // namespace or translation unit scope, add the UsingDirectiveDecl into 6936 // its lookup structure so qualified name lookup can find it. 6937 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6938 if (Ctx && !Ctx->isFunctionOrMethod()) 6939 Ctx->addDecl(UDir); 6940 else 6941 // Otherwise, it is at block sope. The using-directives will affect lookup 6942 // only to the end of the scope. 6943 S->PushUsingDirective(UDir); 6944} 6945 6946 6947Decl *Sema::ActOnUsingDeclaration(Scope *S, 6948 AccessSpecifier AS, 6949 bool HasUsingKeyword, 6950 SourceLocation UsingLoc, 6951 CXXScopeSpec &SS, 6952 UnqualifiedId &Name, 6953 AttributeList *AttrList, 6954 bool HasTypenameKeyword, 6955 SourceLocation TypenameLoc) { 6956 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6957 6958 switch (Name.getKind()) { 6959 case UnqualifiedId::IK_ImplicitSelfParam: 6960 case UnqualifiedId::IK_Identifier: 6961 case UnqualifiedId::IK_OperatorFunctionId: 6962 case UnqualifiedId::IK_LiteralOperatorId: 6963 case UnqualifiedId::IK_ConversionFunctionId: 6964 break; 6965 6966 case UnqualifiedId::IK_ConstructorName: 6967 case UnqualifiedId::IK_ConstructorTemplateId: 6968 // C++11 inheriting constructors. 6969 Diag(Name.getLocStart(), 6970 getLangOpts().CPlusPlus11 ? 6971 diag::warn_cxx98_compat_using_decl_constructor : 6972 diag::err_using_decl_constructor) 6973 << SS.getRange(); 6974 6975 if (getLangOpts().CPlusPlus11) break; 6976 6977 return 0; 6978 6979 case UnqualifiedId::IK_DestructorName: 6980 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6981 << SS.getRange(); 6982 return 0; 6983 6984 case UnqualifiedId::IK_TemplateId: 6985 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6986 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6987 return 0; 6988 } 6989 6990 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6991 DeclarationName TargetName = TargetNameInfo.getName(); 6992 if (!TargetName) 6993 return 0; 6994 6995 // Warn about access declarations. 6996 if (!HasUsingKeyword) { 6997 Diag(Name.getLocStart(), 6998 getLangOpts().CPlusPlus11 ? diag::err_access_decl 6999 : diag::warn_access_decl_deprecated) 7000 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 7001 } 7002 7003 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 7004 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 7005 return 0; 7006 7007 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 7008 TargetNameInfo, AttrList, 7009 /* IsInstantiation */ false, 7010 HasTypenameKeyword, TypenameLoc); 7011 if (UD) 7012 PushOnScopeChains(UD, S, /*AddToContext*/ false); 7013 7014 return UD; 7015} 7016 7017/// \brief Determine whether a using declaration considers the given 7018/// declarations as "equivalent", e.g., if they are redeclarations of 7019/// the same entity or are both typedefs of the same type. 7020static bool 7021IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 7022 bool &SuppressRedeclaration) { 7023 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 7024 SuppressRedeclaration = false; 7025 return true; 7026 } 7027 7028 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 7029 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 7030 SuppressRedeclaration = true; 7031 return Context.hasSameType(TD1->getUnderlyingType(), 7032 TD2->getUnderlyingType()); 7033 } 7034 7035 return false; 7036} 7037 7038 7039/// Determines whether to create a using shadow decl for a particular 7040/// decl, given the set of decls existing prior to this using lookup. 7041bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 7042 const LookupResult &Previous) { 7043 // Diagnose finding a decl which is not from a base class of the 7044 // current class. We do this now because there are cases where this 7045 // function will silently decide not to build a shadow decl, which 7046 // will pre-empt further diagnostics. 7047 // 7048 // We don't need to do this in C++0x because we do the check once on 7049 // the qualifier. 7050 // 7051 // FIXME: diagnose the following if we care enough: 7052 // struct A { int foo; }; 7053 // struct B : A { using A::foo; }; 7054 // template <class T> struct C : A {}; 7055 // template <class T> struct D : C<T> { using B::foo; } // <--- 7056 // This is invalid (during instantiation) in C++03 because B::foo 7057 // resolves to the using decl in B, which is not a base class of D<T>. 7058 // We can't diagnose it immediately because C<T> is an unknown 7059 // specialization. The UsingShadowDecl in D<T> then points directly 7060 // to A::foo, which will look well-formed when we instantiate. 7061 // The right solution is to not collapse the shadow-decl chain. 7062 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 7063 DeclContext *OrigDC = Orig->getDeclContext(); 7064 7065 // Handle enums and anonymous structs. 7066 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 7067 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 7068 while (OrigRec->isAnonymousStructOrUnion()) 7069 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 7070 7071 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 7072 if (OrigDC == CurContext) { 7073 Diag(Using->getLocation(), 7074 diag::err_using_decl_nested_name_specifier_is_current_class) 7075 << Using->getQualifierLoc().getSourceRange(); 7076 Diag(Orig->getLocation(), diag::note_using_decl_target); 7077 return true; 7078 } 7079 7080 Diag(Using->getQualifierLoc().getBeginLoc(), 7081 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7082 << Using->getQualifier() 7083 << cast<CXXRecordDecl>(CurContext) 7084 << Using->getQualifierLoc().getSourceRange(); 7085 Diag(Orig->getLocation(), diag::note_using_decl_target); 7086 return true; 7087 } 7088 } 7089 7090 if (Previous.empty()) return false; 7091 7092 NamedDecl *Target = Orig; 7093 if (isa<UsingShadowDecl>(Target)) 7094 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7095 7096 // If the target happens to be one of the previous declarations, we 7097 // don't have a conflict. 7098 // 7099 // FIXME: but we might be increasing its access, in which case we 7100 // should redeclare it. 7101 NamedDecl *NonTag = 0, *Tag = 0; 7102 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 7103 I != E; ++I) { 7104 NamedDecl *D = (*I)->getUnderlyingDecl(); 7105 bool Result; 7106 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 7107 return Result; 7108 7109 (isa<TagDecl>(D) ? Tag : NonTag) = D; 7110 } 7111 7112 if (Target->isFunctionOrFunctionTemplate()) { 7113 FunctionDecl *FD; 7114 if (isa<FunctionTemplateDecl>(Target)) 7115 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 7116 else 7117 FD = cast<FunctionDecl>(Target); 7118 7119 NamedDecl *OldDecl = 0; 7120 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 7121 case Ovl_Overload: 7122 return false; 7123 7124 case Ovl_NonFunction: 7125 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7126 break; 7127 7128 // We found a decl with the exact signature. 7129 case Ovl_Match: 7130 // If we're in a record, we want to hide the target, so we 7131 // return true (without a diagnostic) to tell the caller not to 7132 // build a shadow decl. 7133 if (CurContext->isRecord()) 7134 return true; 7135 7136 // If we're not in a record, this is an error. 7137 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7138 break; 7139 } 7140 7141 Diag(Target->getLocation(), diag::note_using_decl_target); 7142 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 7143 return true; 7144 } 7145 7146 // Target is not a function. 7147 7148 if (isa<TagDecl>(Target)) { 7149 // No conflict between a tag and a non-tag. 7150 if (!Tag) return false; 7151 7152 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7153 Diag(Target->getLocation(), diag::note_using_decl_target); 7154 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 7155 return true; 7156 } 7157 7158 // No conflict between a tag and a non-tag. 7159 if (!NonTag) return false; 7160 7161 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7162 Diag(Target->getLocation(), diag::note_using_decl_target); 7163 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 7164 return true; 7165} 7166 7167/// Builds a shadow declaration corresponding to a 'using' declaration. 7168UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 7169 UsingDecl *UD, 7170 NamedDecl *Orig) { 7171 7172 // If we resolved to another shadow declaration, just coalesce them. 7173 NamedDecl *Target = Orig; 7174 if (isa<UsingShadowDecl>(Target)) { 7175 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7176 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 7177 } 7178 7179 UsingShadowDecl *Shadow 7180 = UsingShadowDecl::Create(Context, CurContext, 7181 UD->getLocation(), UD, Target); 7182 UD->addShadowDecl(Shadow); 7183 7184 Shadow->setAccess(UD->getAccess()); 7185 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 7186 Shadow->setInvalidDecl(); 7187 7188 if (S) 7189 PushOnScopeChains(Shadow, S); 7190 else 7191 CurContext->addDecl(Shadow); 7192 7193 7194 return Shadow; 7195} 7196 7197/// Hides a using shadow declaration. This is required by the current 7198/// using-decl implementation when a resolvable using declaration in a 7199/// class is followed by a declaration which would hide or override 7200/// one or more of the using decl's targets; for example: 7201/// 7202/// struct Base { void foo(int); }; 7203/// struct Derived : Base { 7204/// using Base::foo; 7205/// void foo(int); 7206/// }; 7207/// 7208/// The governing language is C++03 [namespace.udecl]p12: 7209/// 7210/// When a using-declaration brings names from a base class into a 7211/// derived class scope, member functions in the derived class 7212/// override and/or hide member functions with the same name and 7213/// parameter types in a base class (rather than conflicting). 7214/// 7215/// There are two ways to implement this: 7216/// (1) optimistically create shadow decls when they're not hidden 7217/// by existing declarations, or 7218/// (2) don't create any shadow decls (or at least don't make them 7219/// visible) until we've fully parsed/instantiated the class. 7220/// The problem with (1) is that we might have to retroactively remove 7221/// a shadow decl, which requires several O(n) operations because the 7222/// decl structures are (very reasonably) not designed for removal. 7223/// (2) avoids this but is very fiddly and phase-dependent. 7224void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 7225 if (Shadow->getDeclName().getNameKind() == 7226 DeclarationName::CXXConversionFunctionName) 7227 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 7228 7229 // Remove it from the DeclContext... 7230 Shadow->getDeclContext()->removeDecl(Shadow); 7231 7232 // ...and the scope, if applicable... 7233 if (S) { 7234 S->RemoveDecl(Shadow); 7235 IdResolver.RemoveDecl(Shadow); 7236 } 7237 7238 // ...and the using decl. 7239 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 7240 7241 // TODO: complain somehow if Shadow was used. It shouldn't 7242 // be possible for this to happen, because...? 7243} 7244 7245namespace { 7246class UsingValidatorCCC : public CorrectionCandidateCallback { 7247public: 7248 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation) 7249 : HasTypenameKeyword(HasTypenameKeyword), 7250 IsInstantiation(IsInstantiation) {} 7251 7252 bool ValidateCandidate(const TypoCorrection &Candidate) LLVM_OVERRIDE { 7253 NamedDecl *ND = Candidate.getCorrectionDecl(); 7254 7255 // Keywords are not valid here. 7256 if (!ND || isa<NamespaceDecl>(ND)) 7257 return false; 7258 7259 // Completely unqualified names are invalid for a 'using' declaration. 7260 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) 7261 return false; 7262 7263 if (isa<TypeDecl>(ND)) 7264 return HasTypenameKeyword || !IsInstantiation; 7265 7266 return !HasTypenameKeyword; 7267 } 7268 7269private: 7270 bool HasTypenameKeyword; 7271 bool IsInstantiation; 7272}; 7273} // end anonymous namespace 7274 7275/// Builds a using declaration. 7276/// 7277/// \param IsInstantiation - Whether this call arises from an 7278/// instantiation of an unresolved using declaration. We treat 7279/// the lookup differently for these declarations. 7280NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7281 SourceLocation UsingLoc, 7282 CXXScopeSpec &SS, 7283 const DeclarationNameInfo &NameInfo, 7284 AttributeList *AttrList, 7285 bool IsInstantiation, 7286 bool HasTypenameKeyword, 7287 SourceLocation TypenameLoc) { 7288 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7289 SourceLocation IdentLoc = NameInfo.getLoc(); 7290 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7291 7292 // FIXME: We ignore attributes for now. 7293 7294 if (SS.isEmpty()) { 7295 Diag(IdentLoc, diag::err_using_requires_qualname); 7296 return 0; 7297 } 7298 7299 // Do the redeclaration lookup in the current scope. 7300 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7301 ForRedeclaration); 7302 Previous.setHideTags(false); 7303 if (S) { 7304 LookupName(Previous, S); 7305 7306 // It is really dumb that we have to do this. 7307 LookupResult::Filter F = Previous.makeFilter(); 7308 while (F.hasNext()) { 7309 NamedDecl *D = F.next(); 7310 if (!isDeclInScope(D, CurContext, S)) 7311 F.erase(); 7312 } 7313 F.done(); 7314 } else { 7315 assert(IsInstantiation && "no scope in non-instantiation"); 7316 assert(CurContext->isRecord() && "scope not record in instantiation"); 7317 LookupQualifiedName(Previous, CurContext); 7318 } 7319 7320 // Check for invalid redeclarations. 7321 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, 7322 SS, IdentLoc, Previous)) 7323 return 0; 7324 7325 // Check for bad qualifiers. 7326 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7327 return 0; 7328 7329 DeclContext *LookupContext = computeDeclContext(SS); 7330 NamedDecl *D; 7331 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7332 if (!LookupContext) { 7333 if (HasTypenameKeyword) { 7334 // FIXME: not all declaration name kinds are legal here 7335 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7336 UsingLoc, TypenameLoc, 7337 QualifierLoc, 7338 IdentLoc, NameInfo.getName()); 7339 } else { 7340 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7341 QualifierLoc, NameInfo); 7342 } 7343 } else { 7344 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7345 NameInfo, HasTypenameKeyword); 7346 } 7347 D->setAccess(AS); 7348 CurContext->addDecl(D); 7349 7350 if (!LookupContext) return D; 7351 UsingDecl *UD = cast<UsingDecl>(D); 7352 7353 if (RequireCompleteDeclContext(SS, LookupContext)) { 7354 UD->setInvalidDecl(); 7355 return UD; 7356 } 7357 7358 // The normal rules do not apply to inheriting constructor declarations. 7359 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7360 if (CheckInheritingConstructorUsingDecl(UD)) 7361 UD->setInvalidDecl(); 7362 return UD; 7363 } 7364 7365 // Otherwise, look up the target name. 7366 7367 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7368 7369 // Unlike most lookups, we don't always want to hide tag 7370 // declarations: tag names are visible through the using declaration 7371 // even if hidden by ordinary names, *except* in a dependent context 7372 // where it's important for the sanity of two-phase lookup. 7373 if (!IsInstantiation) 7374 R.setHideTags(false); 7375 7376 // For the purposes of this lookup, we have a base object type 7377 // equal to that of the current context. 7378 if (CurContext->isRecord()) { 7379 R.setBaseObjectType( 7380 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7381 } 7382 7383 LookupQualifiedName(R, LookupContext); 7384 7385 // Try to correct typos if possible. 7386 if (R.empty()) { 7387 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation); 7388 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(), 7389 R.getLookupKind(), S, &SS, CCC)){ 7390 // We reject any correction for which ND would be NULL. 7391 NamedDecl *ND = Corrected.getCorrectionDecl(); 7392 R.setLookupName(Corrected.getCorrection()); 7393 R.addDecl(ND); 7394 // We reject candidates where DroppedSpecifier == true, hence the 7395 // literal '0' below. 7396 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) 7397 << NameInfo.getName() << LookupContext << 0 7398 << SS.getRange()); 7399 } else { 7400 Diag(IdentLoc, diag::err_no_member) 7401 << NameInfo.getName() << LookupContext << SS.getRange(); 7402 UD->setInvalidDecl(); 7403 return UD; 7404 } 7405 } 7406 7407 if (R.isAmbiguous()) { 7408 UD->setInvalidDecl(); 7409 return UD; 7410 } 7411 7412 if (HasTypenameKeyword) { 7413 // If we asked for a typename and got a non-type decl, error out. 7414 if (!R.getAsSingle<TypeDecl>()) { 7415 Diag(IdentLoc, diag::err_using_typename_non_type); 7416 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7417 Diag((*I)->getUnderlyingDecl()->getLocation(), 7418 diag::note_using_decl_target); 7419 UD->setInvalidDecl(); 7420 return UD; 7421 } 7422 } else { 7423 // If we asked for a non-typename and we got a type, error out, 7424 // but only if this is an instantiation of an unresolved using 7425 // decl. Otherwise just silently find the type name. 7426 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7427 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7428 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7429 UD->setInvalidDecl(); 7430 return UD; 7431 } 7432 } 7433 7434 // C++0x N2914 [namespace.udecl]p6: 7435 // A using-declaration shall not name a namespace. 7436 if (R.getAsSingle<NamespaceDecl>()) { 7437 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7438 << SS.getRange(); 7439 UD->setInvalidDecl(); 7440 return UD; 7441 } 7442 7443 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7444 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7445 BuildUsingShadowDecl(S, UD, *I); 7446 } 7447 7448 return UD; 7449} 7450 7451/// Additional checks for a using declaration referring to a constructor name. 7452bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7453 assert(!UD->hasTypename() && "expecting a constructor name"); 7454 7455 const Type *SourceType = UD->getQualifier()->getAsType(); 7456 assert(SourceType && 7457 "Using decl naming constructor doesn't have type in scope spec."); 7458 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7459 7460 // Check whether the named type is a direct base class. 7461 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7462 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7463 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7464 BaseIt != BaseE; ++BaseIt) { 7465 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7466 if (CanonicalSourceType == BaseType) 7467 break; 7468 if (BaseIt->getType()->isDependentType()) 7469 break; 7470 } 7471 7472 if (BaseIt == BaseE) { 7473 // Did not find SourceType in the bases. 7474 Diag(UD->getUsingLoc(), 7475 diag::err_using_decl_constructor_not_in_direct_base) 7476 << UD->getNameInfo().getSourceRange() 7477 << QualType(SourceType, 0) << TargetClass; 7478 return true; 7479 } 7480 7481 if (!CurContext->isDependentContext()) 7482 BaseIt->setInheritConstructors(); 7483 7484 return false; 7485} 7486 7487/// Checks that the given using declaration is not an invalid 7488/// redeclaration. Note that this is checking only for the using decl 7489/// itself, not for any ill-formedness among the UsingShadowDecls. 7490bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7491 bool HasTypenameKeyword, 7492 const CXXScopeSpec &SS, 7493 SourceLocation NameLoc, 7494 const LookupResult &Prev) { 7495 // C++03 [namespace.udecl]p8: 7496 // C++0x [namespace.udecl]p10: 7497 // A using-declaration is a declaration and can therefore be used 7498 // repeatedly where (and only where) multiple declarations are 7499 // allowed. 7500 // 7501 // That's in non-member contexts. 7502 if (!CurContext->getRedeclContext()->isRecord()) 7503 return false; 7504 7505 NestedNameSpecifier *Qual 7506 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7507 7508 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7509 NamedDecl *D = *I; 7510 7511 bool DTypename; 7512 NestedNameSpecifier *DQual; 7513 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7514 DTypename = UD->hasTypename(); 7515 DQual = UD->getQualifier(); 7516 } else if (UnresolvedUsingValueDecl *UD 7517 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7518 DTypename = false; 7519 DQual = UD->getQualifier(); 7520 } else if (UnresolvedUsingTypenameDecl *UD 7521 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7522 DTypename = true; 7523 DQual = UD->getQualifier(); 7524 } else continue; 7525 7526 // using decls differ if one says 'typename' and the other doesn't. 7527 // FIXME: non-dependent using decls? 7528 if (HasTypenameKeyword != DTypename) continue; 7529 7530 // using decls differ if they name different scopes (but note that 7531 // template instantiation can cause this check to trigger when it 7532 // didn't before instantiation). 7533 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7534 Context.getCanonicalNestedNameSpecifier(DQual)) 7535 continue; 7536 7537 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7538 Diag(D->getLocation(), diag::note_using_decl) << 1; 7539 return true; 7540 } 7541 7542 return false; 7543} 7544 7545 7546/// Checks that the given nested-name qualifier used in a using decl 7547/// in the current context is appropriately related to the current 7548/// scope. If an error is found, diagnoses it and returns true. 7549bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7550 const CXXScopeSpec &SS, 7551 SourceLocation NameLoc) { 7552 DeclContext *NamedContext = computeDeclContext(SS); 7553 7554 if (!CurContext->isRecord()) { 7555 // C++03 [namespace.udecl]p3: 7556 // C++0x [namespace.udecl]p8: 7557 // A using-declaration for a class member shall be a member-declaration. 7558 7559 // If we weren't able to compute a valid scope, it must be a 7560 // dependent class scope. 7561 if (!NamedContext || NamedContext->isRecord()) { 7562 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7563 << SS.getRange(); 7564 return true; 7565 } 7566 7567 // Otherwise, everything is known to be fine. 7568 return false; 7569 } 7570 7571 // The current scope is a record. 7572 7573 // If the named context is dependent, we can't decide much. 7574 if (!NamedContext) { 7575 // FIXME: in C++0x, we can diagnose if we can prove that the 7576 // nested-name-specifier does not refer to a base class, which is 7577 // still possible in some cases. 7578 7579 // Otherwise we have to conservatively report that things might be 7580 // okay. 7581 return false; 7582 } 7583 7584 if (!NamedContext->isRecord()) { 7585 // Ideally this would point at the last name in the specifier, 7586 // but we don't have that level of source info. 7587 Diag(SS.getRange().getBegin(), 7588 diag::err_using_decl_nested_name_specifier_is_not_class) 7589 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7590 return true; 7591 } 7592 7593 if (!NamedContext->isDependentContext() && 7594 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7595 return true; 7596 7597 if (getLangOpts().CPlusPlus11) { 7598 // C++0x [namespace.udecl]p3: 7599 // In a using-declaration used as a member-declaration, the 7600 // nested-name-specifier shall name a base class of the class 7601 // being defined. 7602 7603 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7604 cast<CXXRecordDecl>(NamedContext))) { 7605 if (CurContext == NamedContext) { 7606 Diag(NameLoc, 7607 diag::err_using_decl_nested_name_specifier_is_current_class) 7608 << SS.getRange(); 7609 return true; 7610 } 7611 7612 Diag(SS.getRange().getBegin(), 7613 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7614 << (NestedNameSpecifier*) SS.getScopeRep() 7615 << cast<CXXRecordDecl>(CurContext) 7616 << SS.getRange(); 7617 return true; 7618 } 7619 7620 return false; 7621 } 7622 7623 // C++03 [namespace.udecl]p4: 7624 // A using-declaration used as a member-declaration shall refer 7625 // to a member of a base class of the class being defined [etc.]. 7626 7627 // Salient point: SS doesn't have to name a base class as long as 7628 // lookup only finds members from base classes. Therefore we can 7629 // diagnose here only if we can prove that that can't happen, 7630 // i.e. if the class hierarchies provably don't intersect. 7631 7632 // TODO: it would be nice if "definitely valid" results were cached 7633 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7634 // need to be repeated. 7635 7636 struct UserData { 7637 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7638 7639 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7640 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7641 Data->Bases.insert(Base); 7642 return true; 7643 } 7644 7645 bool hasDependentBases(const CXXRecordDecl *Class) { 7646 return !Class->forallBases(collect, this); 7647 } 7648 7649 /// Returns true if the base is dependent or is one of the 7650 /// accumulated base classes. 7651 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7652 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7653 return !Data->Bases.count(Base); 7654 } 7655 7656 bool mightShareBases(const CXXRecordDecl *Class) { 7657 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7658 } 7659 }; 7660 7661 UserData Data; 7662 7663 // Returns false if we find a dependent base. 7664 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7665 return false; 7666 7667 // Returns false if the class has a dependent base or if it or one 7668 // of its bases is present in the base set of the current context. 7669 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7670 return false; 7671 7672 Diag(SS.getRange().getBegin(), 7673 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7674 << (NestedNameSpecifier*) SS.getScopeRep() 7675 << cast<CXXRecordDecl>(CurContext) 7676 << SS.getRange(); 7677 7678 return true; 7679} 7680 7681Decl *Sema::ActOnAliasDeclaration(Scope *S, 7682 AccessSpecifier AS, 7683 MultiTemplateParamsArg TemplateParamLists, 7684 SourceLocation UsingLoc, 7685 UnqualifiedId &Name, 7686 AttributeList *AttrList, 7687 TypeResult Type) { 7688 // Skip up to the relevant declaration scope. 7689 while (S->getFlags() & Scope::TemplateParamScope) 7690 S = S->getParent(); 7691 assert((S->getFlags() & Scope::DeclScope) && 7692 "got alias-declaration outside of declaration scope"); 7693 7694 if (Type.isInvalid()) 7695 return 0; 7696 7697 bool Invalid = false; 7698 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7699 TypeSourceInfo *TInfo = 0; 7700 GetTypeFromParser(Type.get(), &TInfo); 7701 7702 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7703 return 0; 7704 7705 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7706 UPPC_DeclarationType)) { 7707 Invalid = true; 7708 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7709 TInfo->getTypeLoc().getBeginLoc()); 7710 } 7711 7712 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7713 LookupName(Previous, S); 7714 7715 // Warn about shadowing the name of a template parameter. 7716 if (Previous.isSingleResult() && 7717 Previous.getFoundDecl()->isTemplateParameter()) { 7718 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7719 Previous.clear(); 7720 } 7721 7722 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7723 "name in alias declaration must be an identifier"); 7724 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7725 Name.StartLocation, 7726 Name.Identifier, TInfo); 7727 7728 NewTD->setAccess(AS); 7729 7730 if (Invalid) 7731 NewTD->setInvalidDecl(); 7732 7733 ProcessDeclAttributeList(S, NewTD, AttrList); 7734 7735 CheckTypedefForVariablyModifiedType(S, NewTD); 7736 Invalid |= NewTD->isInvalidDecl(); 7737 7738 bool Redeclaration = false; 7739 7740 NamedDecl *NewND; 7741 if (TemplateParamLists.size()) { 7742 TypeAliasTemplateDecl *OldDecl = 0; 7743 TemplateParameterList *OldTemplateParams = 0; 7744 7745 if (TemplateParamLists.size() != 1) { 7746 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7747 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7748 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7749 } 7750 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7751 7752 // Only consider previous declarations in the same scope. 7753 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7754 /*ExplicitInstantiationOrSpecialization*/false); 7755 if (!Previous.empty()) { 7756 Redeclaration = true; 7757 7758 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7759 if (!OldDecl && !Invalid) { 7760 Diag(UsingLoc, diag::err_redefinition_different_kind) 7761 << Name.Identifier; 7762 7763 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7764 if (OldD->getLocation().isValid()) 7765 Diag(OldD->getLocation(), diag::note_previous_definition); 7766 7767 Invalid = true; 7768 } 7769 7770 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7771 if (TemplateParameterListsAreEqual(TemplateParams, 7772 OldDecl->getTemplateParameters(), 7773 /*Complain=*/true, 7774 TPL_TemplateMatch)) 7775 OldTemplateParams = OldDecl->getTemplateParameters(); 7776 else 7777 Invalid = true; 7778 7779 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7780 if (!Invalid && 7781 !Context.hasSameType(OldTD->getUnderlyingType(), 7782 NewTD->getUnderlyingType())) { 7783 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7784 // but we can't reasonably accept it. 7785 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7786 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7787 if (OldTD->getLocation().isValid()) 7788 Diag(OldTD->getLocation(), diag::note_previous_definition); 7789 Invalid = true; 7790 } 7791 } 7792 } 7793 7794 // Merge any previous default template arguments into our parameters, 7795 // and check the parameter list. 7796 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7797 TPC_TypeAliasTemplate)) 7798 return 0; 7799 7800 TypeAliasTemplateDecl *NewDecl = 7801 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7802 Name.Identifier, TemplateParams, 7803 NewTD); 7804 7805 NewDecl->setAccess(AS); 7806 7807 if (Invalid) 7808 NewDecl->setInvalidDecl(); 7809 else if (OldDecl) 7810 NewDecl->setPreviousDeclaration(OldDecl); 7811 7812 NewND = NewDecl; 7813 } else { 7814 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7815 NewND = NewTD; 7816 } 7817 7818 if (!Redeclaration) 7819 PushOnScopeChains(NewND, S); 7820 7821 ActOnDocumentableDecl(NewND); 7822 return NewND; 7823} 7824 7825Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7826 SourceLocation NamespaceLoc, 7827 SourceLocation AliasLoc, 7828 IdentifierInfo *Alias, 7829 CXXScopeSpec &SS, 7830 SourceLocation IdentLoc, 7831 IdentifierInfo *Ident) { 7832 7833 // Lookup the namespace name. 7834 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7835 LookupParsedName(R, S, &SS); 7836 7837 // Check if we have a previous declaration with the same name. 7838 NamedDecl *PrevDecl 7839 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7840 ForRedeclaration); 7841 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7842 PrevDecl = 0; 7843 7844 if (PrevDecl) { 7845 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7846 // We already have an alias with the same name that points to the same 7847 // namespace, so don't create a new one. 7848 // FIXME: At some point, we'll want to create the (redundant) 7849 // declaration to maintain better source information. 7850 if (!R.isAmbiguous() && !R.empty() && 7851 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7852 return 0; 7853 } 7854 7855 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7856 diag::err_redefinition_different_kind; 7857 Diag(AliasLoc, DiagID) << Alias; 7858 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7859 return 0; 7860 } 7861 7862 if (R.isAmbiguous()) 7863 return 0; 7864 7865 if (R.empty()) { 7866 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7867 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7868 return 0; 7869 } 7870 } 7871 7872 NamespaceAliasDecl *AliasDecl = 7873 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7874 Alias, SS.getWithLocInContext(Context), 7875 IdentLoc, R.getFoundDecl()); 7876 7877 PushOnScopeChains(AliasDecl, S); 7878 return AliasDecl; 7879} 7880 7881Sema::ImplicitExceptionSpecification 7882Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7883 CXXMethodDecl *MD) { 7884 CXXRecordDecl *ClassDecl = MD->getParent(); 7885 7886 // C++ [except.spec]p14: 7887 // An implicitly declared special member function (Clause 12) shall have an 7888 // exception-specification. [...] 7889 ImplicitExceptionSpecification ExceptSpec(*this); 7890 if (ClassDecl->isInvalidDecl()) 7891 return ExceptSpec; 7892 7893 // Direct base-class constructors. 7894 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7895 BEnd = ClassDecl->bases_end(); 7896 B != BEnd; ++B) { 7897 if (B->isVirtual()) // Handled below. 7898 continue; 7899 7900 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7901 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7902 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7903 // If this is a deleted function, add it anyway. This might be conformant 7904 // with the standard. This might not. I'm not sure. It might not matter. 7905 if (Constructor) 7906 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7907 } 7908 } 7909 7910 // Virtual base-class constructors. 7911 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7912 BEnd = ClassDecl->vbases_end(); 7913 B != BEnd; ++B) { 7914 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7915 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7916 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7917 // If this is a deleted function, add it anyway. This might be conformant 7918 // with the standard. This might not. I'm not sure. It might not matter. 7919 if (Constructor) 7920 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7921 } 7922 } 7923 7924 // Field constructors. 7925 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7926 FEnd = ClassDecl->field_end(); 7927 F != FEnd; ++F) { 7928 if (F->hasInClassInitializer()) { 7929 if (Expr *E = F->getInClassInitializer()) 7930 ExceptSpec.CalledExpr(E); 7931 else if (!F->isInvalidDecl()) 7932 // DR1351: 7933 // If the brace-or-equal-initializer of a non-static data member 7934 // invokes a defaulted default constructor of its class or of an 7935 // enclosing class in a potentially evaluated subexpression, the 7936 // program is ill-formed. 7937 // 7938 // This resolution is unworkable: the exception specification of the 7939 // default constructor can be needed in an unevaluated context, in 7940 // particular, in the operand of a noexcept-expression, and we can be 7941 // unable to compute an exception specification for an enclosed class. 7942 // 7943 // We do not allow an in-class initializer to require the evaluation 7944 // of the exception specification for any in-class initializer whose 7945 // definition is not lexically complete. 7946 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7947 } else if (const RecordType *RecordTy 7948 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7949 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7950 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7951 // If this is a deleted function, add it anyway. This might be conformant 7952 // with the standard. This might not. I'm not sure. It might not matter. 7953 // In particular, the problem is that this function never gets called. It 7954 // might just be ill-formed because this function attempts to refer to 7955 // a deleted function here. 7956 if (Constructor) 7957 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7958 } 7959 } 7960 7961 return ExceptSpec; 7962} 7963 7964Sema::ImplicitExceptionSpecification 7965Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7966 CXXRecordDecl *ClassDecl = CD->getParent(); 7967 7968 // C++ [except.spec]p14: 7969 // An inheriting constructor [...] shall have an exception-specification. [...] 7970 ImplicitExceptionSpecification ExceptSpec(*this); 7971 if (ClassDecl->isInvalidDecl()) 7972 return ExceptSpec; 7973 7974 // Inherited constructor. 7975 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7976 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7977 // FIXME: Copying or moving the parameters could add extra exceptions to the 7978 // set, as could the default arguments for the inherited constructor. This 7979 // will be addressed when we implement the resolution of core issue 1351. 7980 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7981 7982 // Direct base-class constructors. 7983 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7984 BEnd = ClassDecl->bases_end(); 7985 B != BEnd; ++B) { 7986 if (B->isVirtual()) // Handled below. 7987 continue; 7988 7989 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7990 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7991 if (BaseClassDecl == InheritedDecl) 7992 continue; 7993 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7994 if (Constructor) 7995 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7996 } 7997 } 7998 7999 // Virtual base-class constructors. 8000 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8001 BEnd = ClassDecl->vbases_end(); 8002 B != BEnd; ++B) { 8003 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8004 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8005 if (BaseClassDecl == InheritedDecl) 8006 continue; 8007 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 8008 if (Constructor) 8009 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8010 } 8011 } 8012 8013 // Field constructors. 8014 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8015 FEnd = ClassDecl->field_end(); 8016 F != FEnd; ++F) { 8017 if (F->hasInClassInitializer()) { 8018 if (Expr *E = F->getInClassInitializer()) 8019 ExceptSpec.CalledExpr(E); 8020 else if (!F->isInvalidDecl()) 8021 Diag(CD->getLocation(), 8022 diag::err_in_class_initializer_references_def_ctor) << CD; 8023 } else if (const RecordType *RecordTy 8024 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8025 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8026 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 8027 if (Constructor) 8028 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8029 } 8030 } 8031 8032 return ExceptSpec; 8033} 8034 8035namespace { 8036/// RAII object to register a special member as being currently declared. 8037struct DeclaringSpecialMember { 8038 Sema &S; 8039 Sema::SpecialMemberDecl D; 8040 bool WasAlreadyBeingDeclared; 8041 8042 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 8043 : S(S), D(RD, CSM) { 8044 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 8045 if (WasAlreadyBeingDeclared) 8046 // This almost never happens, but if it does, ensure that our cache 8047 // doesn't contain a stale result. 8048 S.SpecialMemberCache.clear(); 8049 8050 // FIXME: Register a note to be produced if we encounter an error while 8051 // declaring the special member. 8052 } 8053 ~DeclaringSpecialMember() { 8054 if (!WasAlreadyBeingDeclared) 8055 S.SpecialMembersBeingDeclared.erase(D); 8056 } 8057 8058 /// \brief Are we already trying to declare this special member? 8059 bool isAlreadyBeingDeclared() const { 8060 return WasAlreadyBeingDeclared; 8061 } 8062}; 8063} 8064 8065CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 8066 CXXRecordDecl *ClassDecl) { 8067 // C++ [class.ctor]p5: 8068 // A default constructor for a class X is a constructor of class X 8069 // that can be called without an argument. If there is no 8070 // user-declared constructor for class X, a default constructor is 8071 // implicitly declared. An implicitly-declared default constructor 8072 // is an inline public member of its class. 8073 assert(ClassDecl->needsImplicitDefaultConstructor() && 8074 "Should not build implicit default constructor!"); 8075 8076 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 8077 if (DSM.isAlreadyBeingDeclared()) 8078 return 0; 8079 8080 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8081 CXXDefaultConstructor, 8082 false); 8083 8084 // Create the actual constructor declaration. 8085 CanQualType ClassType 8086 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8087 SourceLocation ClassLoc = ClassDecl->getLocation(); 8088 DeclarationName Name 8089 = Context.DeclarationNames.getCXXConstructorName(ClassType); 8090 DeclarationNameInfo NameInfo(Name, ClassLoc); 8091 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 8092 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 8093 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8094 Constexpr); 8095 DefaultCon->setAccess(AS_public); 8096 DefaultCon->setDefaulted(); 8097 DefaultCon->setImplicit(); 8098 8099 // Build an exception specification pointing back at this constructor. 8100 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, DefaultCon); 8101 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8102 8103 // We don't need to use SpecialMemberIsTrivial here; triviality for default 8104 // constructors is easy to compute. 8105 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 8106 8107 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 8108 SetDeclDeleted(DefaultCon, ClassLoc); 8109 8110 // Note that we have declared this constructor. 8111 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 8112 8113 if (Scope *S = getScopeForContext(ClassDecl)) 8114 PushOnScopeChains(DefaultCon, S, false); 8115 ClassDecl->addDecl(DefaultCon); 8116 8117 return DefaultCon; 8118} 8119 8120void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 8121 CXXConstructorDecl *Constructor) { 8122 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 8123 !Constructor->doesThisDeclarationHaveABody() && 8124 !Constructor->isDeleted()) && 8125 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 8126 8127 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8128 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 8129 8130 SynthesizedFunctionScope Scope(*this, Constructor); 8131 DiagnosticErrorTrap Trap(Diags); 8132 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8133 Trap.hasErrorOccurred()) { 8134 Diag(CurrentLocation, diag::note_member_synthesized_at) 8135 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 8136 Constructor->setInvalidDecl(); 8137 return; 8138 } 8139 8140 SourceLocation Loc = Constructor->getLocation(); 8141 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8142 8143 Constructor->markUsed(Context); 8144 MarkVTableUsed(CurrentLocation, ClassDecl); 8145 8146 if (ASTMutationListener *L = getASTMutationListener()) { 8147 L->CompletedImplicitDefinition(Constructor); 8148 } 8149} 8150 8151void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 8152 // Check that any explicitly-defaulted methods have exception specifications 8153 // compatible with their implicit exception specifications. 8154 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 8155 8156 // Once all the member initializers are processed, perform checks to see if 8157 // any unintialized use is happeneing. 8158 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, 8159 D->getLocation()) 8160 == DiagnosticsEngine::Ignored) 8161 return; 8162 8163 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D); 8164 if (!RD) return; 8165 8166 // Holds fields that are uninitialized. 8167 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; 8168 8169 // In the beginning, every field is uninitialized. 8170 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end(); 8171 I != E; ++I) { 8172 if (FieldDecl *FD = dyn_cast<FieldDecl>(*I)) { 8173 UninitializedFields.insert(FD); 8174 } else if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) { 8175 UninitializedFields.insert(IFD->getAnonField()); 8176 } 8177 } 8178 8179 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end(); 8180 I != E; ++I) { 8181 FieldDecl *FD = dyn_cast<FieldDecl>(*I); 8182 if (!FD) 8183 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) 8184 FD = IFD->getAnonField(); 8185 8186 if (!FD) 8187 continue; 8188 8189 Expr *InitExpr = FD->getInClassInitializer(); 8190 if (!InitExpr) { 8191 // Uninitialized reference types will give an error. 8192 // Record types with an initializer are default initialized. 8193 QualType FieldType = FD->getType(); 8194 if (FieldType->isReferenceType() || FieldType->isRecordType()) 8195 UninitializedFields.erase(FD); 8196 continue; 8197 } 8198 8199 CheckInitExprContainsUninitializedFields( 8200 *this, InitExpr, FD, UninitializedFields, 8201 UninitializedFields.count(FD)/*WarnOnSelfReference*/); 8202 8203 UninitializedFields.erase(FD); 8204 } 8205} 8206 8207namespace { 8208/// Information on inheriting constructors to declare. 8209class InheritingConstructorInfo { 8210public: 8211 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 8212 : SemaRef(SemaRef), Derived(Derived) { 8213 // Mark the constructors that we already have in the derived class. 8214 // 8215 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 8216 // unless there is a user-declared constructor with the same signature in 8217 // the class where the using-declaration appears. 8218 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 8219 } 8220 8221 void inheritAll(CXXRecordDecl *RD) { 8222 visitAll(RD, &InheritingConstructorInfo::inherit); 8223 } 8224 8225private: 8226 /// Information about an inheriting constructor. 8227 struct InheritingConstructor { 8228 InheritingConstructor() 8229 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 8230 8231 /// If \c true, a constructor with this signature is already declared 8232 /// in the derived class. 8233 bool DeclaredInDerived; 8234 8235 /// The constructor which is inherited. 8236 const CXXConstructorDecl *BaseCtor; 8237 8238 /// The derived constructor we declared. 8239 CXXConstructorDecl *DerivedCtor; 8240 }; 8241 8242 /// Inheriting constructors with a given canonical type. There can be at 8243 /// most one such non-template constructor, and any number of templated 8244 /// constructors. 8245 struct InheritingConstructorsForType { 8246 InheritingConstructor NonTemplate; 8247 SmallVector<std::pair<TemplateParameterList *, InheritingConstructor>, 4> 8248 Templates; 8249 8250 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 8251 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 8252 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 8253 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 8254 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 8255 false, S.TPL_TemplateMatch)) 8256 return Templates[I].second; 8257 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 8258 return Templates.back().second; 8259 } 8260 8261 return NonTemplate; 8262 } 8263 }; 8264 8265 /// Get or create the inheriting constructor record for a constructor. 8266 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 8267 QualType CtorType) { 8268 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 8269 .getEntry(SemaRef, Ctor); 8270 } 8271 8272 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 8273 8274 /// Process all constructors for a class. 8275 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 8276 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 8277 CtorE = RD->ctor_end(); 8278 CtorIt != CtorE; ++CtorIt) 8279 (this->*Callback)(*CtorIt); 8280 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 8281 I(RD->decls_begin()), E(RD->decls_end()); 8282 I != E; ++I) { 8283 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 8284 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 8285 (this->*Callback)(CD); 8286 } 8287 } 8288 8289 /// Note that a constructor (or constructor template) was declared in Derived. 8290 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 8291 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 8292 } 8293 8294 /// Inherit a single constructor. 8295 void inherit(const CXXConstructorDecl *Ctor) { 8296 const FunctionProtoType *CtorType = 8297 Ctor->getType()->castAs<FunctionProtoType>(); 8298 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 8299 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 8300 8301 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 8302 8303 // Core issue (no number yet): the ellipsis is always discarded. 8304 if (EPI.Variadic) { 8305 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 8306 SemaRef.Diag(Ctor->getLocation(), 8307 diag::note_using_decl_constructor_ellipsis); 8308 EPI.Variadic = false; 8309 } 8310 8311 // Declare a constructor for each number of parameters. 8312 // 8313 // C++11 [class.inhctor]p1: 8314 // The candidate set of inherited constructors from the class X named in 8315 // the using-declaration consists of [... modulo defects ...] for each 8316 // constructor or constructor template of X, the set of constructors or 8317 // constructor templates that results from omitting any ellipsis parameter 8318 // specification and successively omitting parameters with a default 8319 // argument from the end of the parameter-type-list 8320 unsigned MinParams = minParamsToInherit(Ctor); 8321 unsigned Params = Ctor->getNumParams(); 8322 if (Params >= MinParams) { 8323 do 8324 declareCtor(UsingLoc, Ctor, 8325 SemaRef.Context.getFunctionType( 8326 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 8327 while (Params > MinParams && 8328 Ctor->getParamDecl(--Params)->hasDefaultArg()); 8329 } 8330 } 8331 8332 /// Find the using-declaration which specified that we should inherit the 8333 /// constructors of \p Base. 8334 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 8335 // No fancy lookup required; just look for the base constructor name 8336 // directly within the derived class. 8337 ASTContext &Context = SemaRef.Context; 8338 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8339 Context.getCanonicalType(Context.getRecordType(Base))); 8340 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8341 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8342 } 8343 8344 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8345 // C++11 [class.inhctor]p3: 8346 // [F]or each constructor template in the candidate set of inherited 8347 // constructors, a constructor template is implicitly declared 8348 if (Ctor->getDescribedFunctionTemplate()) 8349 return 0; 8350 8351 // For each non-template constructor in the candidate set of inherited 8352 // constructors other than a constructor having no parameters or a 8353 // copy/move constructor having a single parameter, a constructor is 8354 // implicitly declared [...] 8355 if (Ctor->getNumParams() == 0) 8356 return 1; 8357 if (Ctor->isCopyOrMoveConstructor()) 8358 return 2; 8359 8360 // Per discussion on core reflector, never inherit a constructor which 8361 // would become a default, copy, or move constructor of Derived either. 8362 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8363 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8364 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8365 } 8366 8367 /// Declare a single inheriting constructor, inheriting the specified 8368 /// constructor, with the given type. 8369 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8370 QualType DerivedType) { 8371 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8372 8373 // C++11 [class.inhctor]p3: 8374 // ... a constructor is implicitly declared with the same constructor 8375 // characteristics unless there is a user-declared constructor with 8376 // the same signature in the class where the using-declaration appears 8377 if (Entry.DeclaredInDerived) 8378 return; 8379 8380 // C++11 [class.inhctor]p7: 8381 // If two using-declarations declare inheriting constructors with the 8382 // same signature, the program is ill-formed 8383 if (Entry.DerivedCtor) { 8384 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8385 // Only diagnose this once per constructor. 8386 if (Entry.DerivedCtor->isInvalidDecl()) 8387 return; 8388 Entry.DerivedCtor->setInvalidDecl(); 8389 8390 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8391 SemaRef.Diag(BaseCtor->getLocation(), 8392 diag::note_using_decl_constructor_conflict_current_ctor); 8393 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8394 diag::note_using_decl_constructor_conflict_previous_ctor); 8395 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8396 diag::note_using_decl_constructor_conflict_previous_using); 8397 } else { 8398 // Core issue (no number): if the same inheriting constructor is 8399 // produced by multiple base class constructors from the same base 8400 // class, the inheriting constructor is defined as deleted. 8401 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8402 } 8403 8404 return; 8405 } 8406 8407 ASTContext &Context = SemaRef.Context; 8408 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8409 Context.getCanonicalType(Context.getRecordType(Derived))); 8410 DeclarationNameInfo NameInfo(Name, UsingLoc); 8411 8412 TemplateParameterList *TemplateParams = 0; 8413 if (const FunctionTemplateDecl *FTD = 8414 BaseCtor->getDescribedFunctionTemplate()) { 8415 TemplateParams = FTD->getTemplateParameters(); 8416 // We're reusing template parameters from a different DeclContext. This 8417 // is questionable at best, but works out because the template depth in 8418 // both places is guaranteed to be 0. 8419 // FIXME: Rebuild the template parameters in the new context, and 8420 // transform the function type to refer to them. 8421 } 8422 8423 // Build type source info pointing at the using-declaration. This is 8424 // required by template instantiation. 8425 TypeSourceInfo *TInfo = 8426 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8427 FunctionProtoTypeLoc ProtoLoc = 8428 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8429 8430 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8431 Context, Derived, UsingLoc, NameInfo, DerivedType, 8432 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8433 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8434 8435 // Build an unevaluated exception specification for this constructor. 8436 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8437 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8438 EPI.ExceptionSpecType = EST_Unevaluated; 8439 EPI.ExceptionSpecDecl = DerivedCtor; 8440 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8441 FPT->getArgTypes(), EPI)); 8442 8443 // Build the parameter declarations. 8444 SmallVector<ParmVarDecl *, 16> ParamDecls; 8445 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8446 TypeSourceInfo *TInfo = 8447 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8448 ParmVarDecl *PD = ParmVarDecl::Create( 8449 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8450 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8451 PD->setScopeInfo(0, I); 8452 PD->setImplicit(); 8453 ParamDecls.push_back(PD); 8454 ProtoLoc.setArg(I, PD); 8455 } 8456 8457 // Set up the new constructor. 8458 DerivedCtor->setAccess(BaseCtor->getAccess()); 8459 DerivedCtor->setParams(ParamDecls); 8460 DerivedCtor->setInheritedConstructor(BaseCtor); 8461 if (BaseCtor->isDeleted()) 8462 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8463 8464 // If this is a constructor template, build the template declaration. 8465 if (TemplateParams) { 8466 FunctionTemplateDecl *DerivedTemplate = 8467 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8468 TemplateParams, DerivedCtor); 8469 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8470 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8471 Derived->addDecl(DerivedTemplate); 8472 } else { 8473 Derived->addDecl(DerivedCtor); 8474 } 8475 8476 Entry.BaseCtor = BaseCtor; 8477 Entry.DerivedCtor = DerivedCtor; 8478 } 8479 8480 Sema &SemaRef; 8481 CXXRecordDecl *Derived; 8482 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8483 MapType Map; 8484}; 8485} 8486 8487void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8488 // Defer declaring the inheriting constructors until the class is 8489 // instantiated. 8490 if (ClassDecl->isDependentContext()) 8491 return; 8492 8493 // Find base classes from which we might inherit constructors. 8494 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8495 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8496 BaseE = ClassDecl->bases_end(); 8497 BaseIt != BaseE; ++BaseIt) 8498 if (BaseIt->getInheritConstructors()) 8499 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8500 8501 // Go no further if we're not inheriting any constructors. 8502 if (InheritedBases.empty()) 8503 return; 8504 8505 // Declare the inherited constructors. 8506 InheritingConstructorInfo ICI(*this, ClassDecl); 8507 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8508 ICI.inheritAll(InheritedBases[I]); 8509} 8510 8511void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8512 CXXConstructorDecl *Constructor) { 8513 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8514 assert(Constructor->getInheritedConstructor() && 8515 !Constructor->doesThisDeclarationHaveABody() && 8516 !Constructor->isDeleted()); 8517 8518 SynthesizedFunctionScope Scope(*this, Constructor); 8519 DiagnosticErrorTrap Trap(Diags); 8520 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8521 Trap.hasErrorOccurred()) { 8522 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8523 << Context.getTagDeclType(ClassDecl); 8524 Constructor->setInvalidDecl(); 8525 return; 8526 } 8527 8528 SourceLocation Loc = Constructor->getLocation(); 8529 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8530 8531 Constructor->markUsed(Context); 8532 MarkVTableUsed(CurrentLocation, ClassDecl); 8533 8534 if (ASTMutationListener *L = getASTMutationListener()) { 8535 L->CompletedImplicitDefinition(Constructor); 8536 } 8537} 8538 8539 8540Sema::ImplicitExceptionSpecification 8541Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8542 CXXRecordDecl *ClassDecl = MD->getParent(); 8543 8544 // C++ [except.spec]p14: 8545 // An implicitly declared special member function (Clause 12) shall have 8546 // an exception-specification. 8547 ImplicitExceptionSpecification ExceptSpec(*this); 8548 if (ClassDecl->isInvalidDecl()) 8549 return ExceptSpec; 8550 8551 // Direct base-class destructors. 8552 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8553 BEnd = ClassDecl->bases_end(); 8554 B != BEnd; ++B) { 8555 if (B->isVirtual()) // Handled below. 8556 continue; 8557 8558 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8559 ExceptSpec.CalledDecl(B->getLocStart(), 8560 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8561 } 8562 8563 // Virtual base-class destructors. 8564 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8565 BEnd = ClassDecl->vbases_end(); 8566 B != BEnd; ++B) { 8567 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8568 ExceptSpec.CalledDecl(B->getLocStart(), 8569 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8570 } 8571 8572 // Field destructors. 8573 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8574 FEnd = ClassDecl->field_end(); 8575 F != FEnd; ++F) { 8576 if (const RecordType *RecordTy 8577 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8578 ExceptSpec.CalledDecl(F->getLocation(), 8579 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8580 } 8581 8582 return ExceptSpec; 8583} 8584 8585CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8586 // C++ [class.dtor]p2: 8587 // If a class has no user-declared destructor, a destructor is 8588 // declared implicitly. An implicitly-declared destructor is an 8589 // inline public member of its class. 8590 assert(ClassDecl->needsImplicitDestructor()); 8591 8592 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8593 if (DSM.isAlreadyBeingDeclared()) 8594 return 0; 8595 8596 // Create the actual destructor declaration. 8597 CanQualType ClassType 8598 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8599 SourceLocation ClassLoc = ClassDecl->getLocation(); 8600 DeclarationName Name 8601 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8602 DeclarationNameInfo NameInfo(Name, ClassLoc); 8603 CXXDestructorDecl *Destructor 8604 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8605 QualType(), 0, /*isInline=*/true, 8606 /*isImplicitlyDeclared=*/true); 8607 Destructor->setAccess(AS_public); 8608 Destructor->setDefaulted(); 8609 Destructor->setImplicit(); 8610 8611 // Build an exception specification pointing back at this destructor. 8612 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, Destructor); 8613 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8614 8615 AddOverriddenMethods(ClassDecl, Destructor); 8616 8617 // We don't need to use SpecialMemberIsTrivial here; triviality for 8618 // destructors is easy to compute. 8619 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8620 8621 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8622 SetDeclDeleted(Destructor, ClassLoc); 8623 8624 // Note that we have declared this destructor. 8625 ++ASTContext::NumImplicitDestructorsDeclared; 8626 8627 // Introduce this destructor into its scope. 8628 if (Scope *S = getScopeForContext(ClassDecl)) 8629 PushOnScopeChains(Destructor, S, false); 8630 ClassDecl->addDecl(Destructor); 8631 8632 return Destructor; 8633} 8634 8635void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8636 CXXDestructorDecl *Destructor) { 8637 assert((Destructor->isDefaulted() && 8638 !Destructor->doesThisDeclarationHaveABody() && 8639 !Destructor->isDeleted()) && 8640 "DefineImplicitDestructor - call it for implicit default dtor"); 8641 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8642 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8643 8644 if (Destructor->isInvalidDecl()) 8645 return; 8646 8647 SynthesizedFunctionScope Scope(*this, Destructor); 8648 8649 DiagnosticErrorTrap Trap(Diags); 8650 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8651 Destructor->getParent()); 8652 8653 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8654 Diag(CurrentLocation, diag::note_member_synthesized_at) 8655 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8656 8657 Destructor->setInvalidDecl(); 8658 return; 8659 } 8660 8661 SourceLocation Loc = Destructor->getLocation(); 8662 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8663 Destructor->markUsed(Context); 8664 MarkVTableUsed(CurrentLocation, ClassDecl); 8665 8666 if (ASTMutationListener *L = getASTMutationListener()) { 8667 L->CompletedImplicitDefinition(Destructor); 8668 } 8669} 8670 8671/// \brief Perform any semantic analysis which needs to be delayed until all 8672/// pending class member declarations have been parsed. 8673void Sema::ActOnFinishCXXMemberDecls() { 8674 // If the context is an invalid C++ class, just suppress these checks. 8675 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8676 if (Record->isInvalidDecl()) { 8677 DelayedDestructorExceptionSpecChecks.clear(); 8678 return; 8679 } 8680 } 8681 8682 // Perform any deferred checking of exception specifications for virtual 8683 // destructors. 8684 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8685 i != e; ++i) { 8686 const CXXDestructorDecl *Dtor = 8687 DelayedDestructorExceptionSpecChecks[i].first; 8688 assert(!Dtor->getParent()->isDependentType() && 8689 "Should not ever add destructors of templates into the list."); 8690 CheckOverridingFunctionExceptionSpec(Dtor, 8691 DelayedDestructorExceptionSpecChecks[i].second); 8692 } 8693 DelayedDestructorExceptionSpecChecks.clear(); 8694} 8695 8696void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8697 CXXDestructorDecl *Destructor) { 8698 assert(getLangOpts().CPlusPlus11 && 8699 "adjusting dtor exception specs was introduced in c++11"); 8700 8701 // C++11 [class.dtor]p3: 8702 // A declaration of a destructor that does not have an exception- 8703 // specification is implicitly considered to have the same exception- 8704 // specification as an implicit declaration. 8705 const FunctionProtoType *DtorType = Destructor->getType()-> 8706 getAs<FunctionProtoType>(); 8707 if (DtorType->hasExceptionSpec()) 8708 return; 8709 8710 // Replace the destructor's type, building off the existing one. Fortunately, 8711 // the only thing of interest in the destructor type is its extended info. 8712 // The return and arguments are fixed. 8713 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8714 EPI.ExceptionSpecType = EST_Unevaluated; 8715 EPI.ExceptionSpecDecl = Destructor; 8716 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8717 8718 // FIXME: If the destructor has a body that could throw, and the newly created 8719 // spec doesn't allow exceptions, we should emit a warning, because this 8720 // change in behavior can break conforming C++03 programs at runtime. 8721 // However, we don't have a body or an exception specification yet, so it 8722 // needs to be done somewhere else. 8723} 8724 8725namespace { 8726/// \brief An abstract base class for all helper classes used in building the 8727// copy/move operators. These classes serve as factory functions and help us 8728// avoid using the same Expr* in the AST twice. 8729class ExprBuilder { 8730 ExprBuilder(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8731 ExprBuilder &operator=(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8732 8733protected: 8734 static Expr *assertNotNull(Expr *E) { 8735 assert(E && "Expression construction must not fail."); 8736 return E; 8737 } 8738 8739public: 8740 ExprBuilder() {} 8741 virtual ~ExprBuilder() {} 8742 8743 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; 8744}; 8745 8746class RefBuilder: public ExprBuilder { 8747 VarDecl *Var; 8748 QualType VarType; 8749 8750public: 8751 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8752 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).take()); 8753 } 8754 8755 RefBuilder(VarDecl *Var, QualType VarType) 8756 : Var(Var), VarType(VarType) {} 8757}; 8758 8759class ThisBuilder: public ExprBuilder { 8760public: 8761 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8762 return assertNotNull(S.ActOnCXXThis(Loc).takeAs<Expr>()); 8763 } 8764}; 8765 8766class CastBuilder: public ExprBuilder { 8767 const ExprBuilder &Builder; 8768 QualType Type; 8769 ExprValueKind Kind; 8770 const CXXCastPath &Path; 8771 8772public: 8773 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8774 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, 8775 CK_UncheckedDerivedToBase, Kind, 8776 &Path).take()); 8777 } 8778 8779 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, 8780 const CXXCastPath &Path) 8781 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} 8782}; 8783 8784class DerefBuilder: public ExprBuilder { 8785 const ExprBuilder &Builder; 8786 8787public: 8788 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8789 return assertNotNull( 8790 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).take()); 8791 } 8792 8793 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8794}; 8795 8796class MemberBuilder: public ExprBuilder { 8797 const ExprBuilder &Builder; 8798 QualType Type; 8799 CXXScopeSpec SS; 8800 bool IsArrow; 8801 LookupResult &MemberLookup; 8802 8803public: 8804 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8805 return assertNotNull(S.BuildMemberReferenceExpr( 8806 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), 0, 8807 MemberLookup, 0).take()); 8808 } 8809 8810 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, 8811 LookupResult &MemberLookup) 8812 : Builder(Builder), Type(Type), IsArrow(IsArrow), 8813 MemberLookup(MemberLookup) {} 8814}; 8815 8816class MoveCastBuilder: public ExprBuilder { 8817 const ExprBuilder &Builder; 8818 8819public: 8820 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8821 return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); 8822 } 8823 8824 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8825}; 8826 8827class LvalueConvBuilder: public ExprBuilder { 8828 const ExprBuilder &Builder; 8829 8830public: 8831 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8832 return assertNotNull( 8833 S.DefaultLvalueConversion(Builder.build(S, Loc)).take()); 8834 } 8835 8836 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8837}; 8838 8839class SubscriptBuilder: public ExprBuilder { 8840 const ExprBuilder &Base; 8841 const ExprBuilder &Index; 8842 8843public: 8844 virtual Expr *build(Sema &S, SourceLocation Loc) const 8845 LLVM_OVERRIDE { 8846 return assertNotNull(S.CreateBuiltinArraySubscriptExpr( 8847 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).take()); 8848 } 8849 8850 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) 8851 : Base(Base), Index(Index) {} 8852}; 8853 8854} // end anonymous namespace 8855 8856/// When generating a defaulted copy or move assignment operator, if a field 8857/// should be copied with __builtin_memcpy rather than via explicit assignments, 8858/// do so. This optimization only applies for arrays of scalars, and for arrays 8859/// of class type where the selected copy/move-assignment operator is trivial. 8860static StmtResult 8861buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8862 const ExprBuilder &ToB, const ExprBuilder &FromB) { 8863 // Compute the size of the memory buffer to be copied. 8864 QualType SizeType = S.Context.getSizeType(); 8865 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8866 S.Context.getTypeSizeInChars(T).getQuantity()); 8867 8868 // Take the address of the field references for "from" and "to". We 8869 // directly construct UnaryOperators here because semantic analysis 8870 // does not permit us to take the address of an xvalue. 8871 Expr *From = FromB.build(S, Loc); 8872 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8873 S.Context.getPointerType(From->getType()), 8874 VK_RValue, OK_Ordinary, Loc); 8875 Expr *To = ToB.build(S, Loc); 8876 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8877 S.Context.getPointerType(To->getType()), 8878 VK_RValue, OK_Ordinary, Loc); 8879 8880 const Type *E = T->getBaseElementTypeUnsafe(); 8881 bool NeedsCollectableMemCpy = 8882 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8883 8884 // Create a reference to the __builtin_objc_memmove_collectable function 8885 StringRef MemCpyName = NeedsCollectableMemCpy ? 8886 "__builtin_objc_memmove_collectable" : 8887 "__builtin_memcpy"; 8888 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8889 Sema::LookupOrdinaryName); 8890 S.LookupName(R, S.TUScope, true); 8891 8892 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8893 if (!MemCpy) 8894 // Something went horribly wrong earlier, and we will have complained 8895 // about it. 8896 return StmtError(); 8897 8898 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8899 VK_RValue, Loc, 0); 8900 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8901 8902 Expr *CallArgs[] = { 8903 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8904 }; 8905 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8906 Loc, CallArgs, Loc); 8907 8908 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8909 return S.Owned(Call.takeAs<Stmt>()); 8910} 8911 8912/// \brief Builds a statement that copies/moves the given entity from \p From to 8913/// \c To. 8914/// 8915/// This routine is used to copy/move the members of a class with an 8916/// implicitly-declared copy/move assignment operator. When the entities being 8917/// copied are arrays, this routine builds for loops to copy them. 8918/// 8919/// \param S The Sema object used for type-checking. 8920/// 8921/// \param Loc The location where the implicit copy/move is being generated. 8922/// 8923/// \param T The type of the expressions being copied/moved. Both expressions 8924/// must have this type. 8925/// 8926/// \param To The expression we are copying/moving to. 8927/// 8928/// \param From The expression we are copying/moving from. 8929/// 8930/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8931/// Otherwise, it's a non-static member subobject. 8932/// 8933/// \param Copying Whether we're copying or moving. 8934/// 8935/// \param Depth Internal parameter recording the depth of the recursion. 8936/// 8937/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8938/// if a memcpy should be used instead. 8939static StmtResult 8940buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8941 const ExprBuilder &To, const ExprBuilder &From, 8942 bool CopyingBaseSubobject, bool Copying, 8943 unsigned Depth = 0) { 8944 // C++11 [class.copy]p28: 8945 // Each subobject is assigned in the manner appropriate to its type: 8946 // 8947 // - if the subobject is of class type, as if by a call to operator= with 8948 // the subobject as the object expression and the corresponding 8949 // subobject of x as a single function argument (as if by explicit 8950 // qualification; that is, ignoring any possible virtual overriding 8951 // functions in more derived classes); 8952 // 8953 // C++03 [class.copy]p13: 8954 // - if the subobject is of class type, the copy assignment operator for 8955 // the class is used (as if by explicit qualification; that is, 8956 // ignoring any possible virtual overriding functions in more derived 8957 // classes); 8958 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8959 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8960 8961 // Look for operator=. 8962 DeclarationName Name 8963 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8964 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8965 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8966 8967 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8968 // operator. 8969 if (!S.getLangOpts().CPlusPlus11) { 8970 LookupResult::Filter F = OpLookup.makeFilter(); 8971 while (F.hasNext()) { 8972 NamedDecl *D = F.next(); 8973 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8974 if (Method->isCopyAssignmentOperator() || 8975 (!Copying && Method->isMoveAssignmentOperator())) 8976 continue; 8977 8978 F.erase(); 8979 } 8980 F.done(); 8981 } 8982 8983 // Suppress the protected check (C++ [class.protected]) for each of the 8984 // assignment operators we found. This strange dance is required when 8985 // we're assigning via a base classes's copy-assignment operator. To 8986 // ensure that we're getting the right base class subobject (without 8987 // ambiguities), we need to cast "this" to that subobject type; to 8988 // ensure that we don't go through the virtual call mechanism, we need 8989 // to qualify the operator= name with the base class (see below). However, 8990 // this means that if the base class has a protected copy assignment 8991 // operator, the protected member access check will fail. So, we 8992 // rewrite "protected" access to "public" access in this case, since we 8993 // know by construction that we're calling from a derived class. 8994 if (CopyingBaseSubobject) { 8995 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8996 L != LEnd; ++L) { 8997 if (L.getAccess() == AS_protected) 8998 L.setAccess(AS_public); 8999 } 9000 } 9001 9002 // Create the nested-name-specifier that will be used to qualify the 9003 // reference to operator=; this is required to suppress the virtual 9004 // call mechanism. 9005 CXXScopeSpec SS; 9006 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 9007 SS.MakeTrivial(S.Context, 9008 NestedNameSpecifier::Create(S.Context, 0, false, 9009 CanonicalT), 9010 Loc); 9011 9012 // Create the reference to operator=. 9013 ExprResult OpEqualRef 9014 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false, 9015 SS, /*TemplateKWLoc=*/SourceLocation(), 9016 /*FirstQualifierInScope=*/0, 9017 OpLookup, 9018 /*TemplateArgs=*/0, 9019 /*SuppressQualifierCheck=*/true); 9020 if (OpEqualRef.isInvalid()) 9021 return StmtError(); 9022 9023 // Build the call to the assignment operator. 9024 9025 Expr *FromInst = From.build(S, Loc); 9026 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 9027 OpEqualRef.takeAs<Expr>(), 9028 Loc, FromInst, Loc); 9029 if (Call.isInvalid()) 9030 return StmtError(); 9031 9032 // If we built a call to a trivial 'operator=' while copying an array, 9033 // bail out. We'll replace the whole shebang with a memcpy. 9034 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 9035 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 9036 return StmtResult((Stmt*)0); 9037 9038 // Convert to an expression-statement, and clean up any produced 9039 // temporaries. 9040 return S.ActOnExprStmt(Call); 9041 } 9042 9043 // - if the subobject is of scalar type, the built-in assignment 9044 // operator is used. 9045 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 9046 if (!ArrayTy) { 9047 ExprResult Assignment = S.CreateBuiltinBinOp( 9048 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); 9049 if (Assignment.isInvalid()) 9050 return StmtError(); 9051 return S.ActOnExprStmt(Assignment); 9052 } 9053 9054 // - if the subobject is an array, each element is assigned, in the 9055 // manner appropriate to the element type; 9056 9057 // Construct a loop over the array bounds, e.g., 9058 // 9059 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 9060 // 9061 // that will copy each of the array elements. 9062 QualType SizeType = S.Context.getSizeType(); 9063 9064 // Create the iteration variable. 9065 IdentifierInfo *IterationVarName = 0; 9066 { 9067 SmallString<8> Str; 9068 llvm::raw_svector_ostream OS(Str); 9069 OS << "__i" << Depth; 9070 IterationVarName = &S.Context.Idents.get(OS.str()); 9071 } 9072 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 9073 IterationVarName, SizeType, 9074 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 9075 SC_None); 9076 9077 // Initialize the iteration variable to zero. 9078 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 9079 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 9080 9081 // Creates a reference to the iteration variable. 9082 RefBuilder IterationVarRef(IterationVar, SizeType); 9083 LvalueConvBuilder IterationVarRefRVal(IterationVarRef); 9084 9085 // Create the DeclStmt that holds the iteration variable. 9086 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 9087 9088 // Subscript the "from" and "to" expressions with the iteration variable. 9089 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); 9090 MoveCastBuilder FromIndexMove(FromIndexCopy); 9091 const ExprBuilder *FromIndex; 9092 if (Copying) 9093 FromIndex = &FromIndexCopy; 9094 else 9095 FromIndex = &FromIndexMove; 9096 9097 SubscriptBuilder ToIndex(To, IterationVarRefRVal); 9098 9099 // Build the copy/move for an individual element of the array. 9100 StmtResult Copy = 9101 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 9102 ToIndex, *FromIndex, CopyingBaseSubobject, 9103 Copying, Depth + 1); 9104 // Bail out if copying fails or if we determined that we should use memcpy. 9105 if (Copy.isInvalid() || !Copy.get()) 9106 return Copy; 9107 9108 // Create the comparison against the array bound. 9109 llvm::APInt Upper 9110 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 9111 Expr *Comparison 9112 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc), 9113 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 9114 BO_NE, S.Context.BoolTy, 9115 VK_RValue, OK_Ordinary, Loc, false); 9116 9117 // Create the pre-increment of the iteration variable. 9118 Expr *Increment 9119 = new (S.Context) UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, 9120 SizeType, VK_LValue, OK_Ordinary, Loc); 9121 9122 // Construct the loop that copies all elements of this array. 9123 return S.ActOnForStmt(Loc, Loc, InitStmt, 9124 S.MakeFullExpr(Comparison), 9125 0, S.MakeFullDiscardedValueExpr(Increment), 9126 Loc, Copy.take()); 9127} 9128 9129static StmtResult 9130buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 9131 const ExprBuilder &To, const ExprBuilder &From, 9132 bool CopyingBaseSubobject, bool Copying) { 9133 // Maybe we should use a memcpy? 9134 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 9135 T.isTriviallyCopyableType(S.Context)) 9136 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 9137 9138 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 9139 CopyingBaseSubobject, 9140 Copying, 0)); 9141 9142 // If we ended up picking a trivial assignment operator for an array of a 9143 // non-trivially-copyable class type, just emit a memcpy. 9144 if (!Result.isInvalid() && !Result.get()) 9145 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 9146 9147 return Result; 9148} 9149 9150Sema::ImplicitExceptionSpecification 9151Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 9152 CXXRecordDecl *ClassDecl = MD->getParent(); 9153 9154 ImplicitExceptionSpecification ExceptSpec(*this); 9155 if (ClassDecl->isInvalidDecl()) 9156 return ExceptSpec; 9157 9158 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9159 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 9160 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9161 9162 // C++ [except.spec]p14: 9163 // An implicitly declared special member function (Clause 12) shall have an 9164 // exception-specification. [...] 9165 9166 // It is unspecified whether or not an implicit copy assignment operator 9167 // attempts to deduplicate calls to assignment operators of virtual bases are 9168 // made. As such, this exception specification is effectively unspecified. 9169 // Based on a similar decision made for constness in C++0x, we're erring on 9170 // the side of assuming such calls to be made regardless of whether they 9171 // actually happen. 9172 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9173 BaseEnd = ClassDecl->bases_end(); 9174 Base != BaseEnd; ++Base) { 9175 if (Base->isVirtual()) 9176 continue; 9177 9178 CXXRecordDecl *BaseClassDecl 9179 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9180 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9181 ArgQuals, false, 0)) 9182 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9183 } 9184 9185 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9186 BaseEnd = ClassDecl->vbases_end(); 9187 Base != BaseEnd; ++Base) { 9188 CXXRecordDecl *BaseClassDecl 9189 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9190 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9191 ArgQuals, false, 0)) 9192 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9193 } 9194 9195 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9196 FieldEnd = ClassDecl->field_end(); 9197 Field != FieldEnd; 9198 ++Field) { 9199 QualType FieldType = Context.getBaseElementType(Field->getType()); 9200 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9201 if (CXXMethodDecl *CopyAssign = 9202 LookupCopyingAssignment(FieldClassDecl, 9203 ArgQuals | FieldType.getCVRQualifiers(), 9204 false, 0)) 9205 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 9206 } 9207 } 9208 9209 return ExceptSpec; 9210} 9211 9212CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 9213 // Note: The following rules are largely analoguous to the copy 9214 // constructor rules. Note that virtual bases are not taken into account 9215 // for determining the argument type of the operator. Note also that 9216 // operators taking an object instead of a reference are allowed. 9217 assert(ClassDecl->needsImplicitCopyAssignment()); 9218 9219 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 9220 if (DSM.isAlreadyBeingDeclared()) 9221 return 0; 9222 9223 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9224 QualType RetType = Context.getLValueReferenceType(ArgType); 9225 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 9226 if (Const) 9227 ArgType = ArgType.withConst(); 9228 ArgType = Context.getLValueReferenceType(ArgType); 9229 9230 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9231 CXXCopyAssignment, 9232 Const); 9233 9234 // An implicitly-declared copy assignment operator is an inline public 9235 // member of its class. 9236 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9237 SourceLocation ClassLoc = ClassDecl->getLocation(); 9238 DeclarationNameInfo NameInfo(Name, ClassLoc); 9239 CXXMethodDecl *CopyAssignment = 9240 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9241 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 9242 /*isInline=*/ true, Constexpr, SourceLocation()); 9243 CopyAssignment->setAccess(AS_public); 9244 CopyAssignment->setDefaulted(); 9245 CopyAssignment->setImplicit(); 9246 9247 // Build an exception specification pointing back at this member. 9248 FunctionProtoType::ExtProtoInfo EPI = 9249 getImplicitMethodEPI(*this, CopyAssignment); 9250 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9251 9252 // Add the parameter to the operator. 9253 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 9254 ClassLoc, ClassLoc, /*Id=*/0, 9255 ArgType, /*TInfo=*/0, 9256 SC_None, 0); 9257 CopyAssignment->setParams(FromParam); 9258 9259 AddOverriddenMethods(ClassDecl, CopyAssignment); 9260 9261 CopyAssignment->setTrivial( 9262 ClassDecl->needsOverloadResolutionForCopyAssignment() 9263 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 9264 : ClassDecl->hasTrivialCopyAssignment()); 9265 9266 // C++11 [class.copy]p19: 9267 // .... If the class definition does not explicitly declare a copy 9268 // assignment operator, there is no user-declared move constructor, and 9269 // there is no user-declared move assignment operator, a copy assignment 9270 // operator is implicitly declared as defaulted. 9271 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 9272 SetDeclDeleted(CopyAssignment, ClassLoc); 9273 9274 // Note that we have added this copy-assignment operator. 9275 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 9276 9277 if (Scope *S = getScopeForContext(ClassDecl)) 9278 PushOnScopeChains(CopyAssignment, S, false); 9279 ClassDecl->addDecl(CopyAssignment); 9280 9281 return CopyAssignment; 9282} 9283 9284/// Diagnose an implicit copy operation for a class which is odr-used, but 9285/// which is deprecated because the class has a user-declared copy constructor, 9286/// copy assignment operator, or destructor. 9287static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 9288 SourceLocation UseLoc) { 9289 assert(CopyOp->isImplicit()); 9290 9291 CXXRecordDecl *RD = CopyOp->getParent(); 9292 CXXMethodDecl *UserDeclaredOperation = 0; 9293 9294 // In Microsoft mode, assignment operations don't affect constructors and 9295 // vice versa. 9296 if (RD->hasUserDeclaredDestructor()) { 9297 UserDeclaredOperation = RD->getDestructor(); 9298 } else if (!isa<CXXConstructorDecl>(CopyOp) && 9299 RD->hasUserDeclaredCopyConstructor() && 9300 !S.getLangOpts().MicrosoftMode) { 9301 // Find any user-declared copy constructor. 9302 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 9303 E = RD->ctor_end(); I != E; ++I) { 9304 if (I->isCopyConstructor()) { 9305 UserDeclaredOperation = *I; 9306 break; 9307 } 9308 } 9309 assert(UserDeclaredOperation); 9310 } else if (isa<CXXConstructorDecl>(CopyOp) && 9311 RD->hasUserDeclaredCopyAssignment() && 9312 !S.getLangOpts().MicrosoftMode) { 9313 // Find any user-declared move assignment operator. 9314 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 9315 E = RD->method_end(); I != E; ++I) { 9316 if (I->isCopyAssignmentOperator()) { 9317 UserDeclaredOperation = *I; 9318 break; 9319 } 9320 } 9321 assert(UserDeclaredOperation); 9322 } 9323 9324 if (UserDeclaredOperation) { 9325 S.Diag(UserDeclaredOperation->getLocation(), 9326 diag::warn_deprecated_copy_operation) 9327 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 9328 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 9329 S.Diag(UseLoc, diag::note_member_synthesized_at) 9330 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 9331 : Sema::CXXCopyAssignment) 9332 << RD; 9333 } 9334} 9335 9336void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 9337 CXXMethodDecl *CopyAssignOperator) { 9338 assert((CopyAssignOperator->isDefaulted() && 9339 CopyAssignOperator->isOverloadedOperator() && 9340 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 9341 !CopyAssignOperator->doesThisDeclarationHaveABody() && 9342 !CopyAssignOperator->isDeleted()) && 9343 "DefineImplicitCopyAssignment called for wrong function"); 9344 9345 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 9346 9347 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 9348 CopyAssignOperator->setInvalidDecl(); 9349 return; 9350 } 9351 9352 // C++11 [class.copy]p18: 9353 // The [definition of an implicitly declared copy assignment operator] is 9354 // deprecated if the class has a user-declared copy constructor or a 9355 // user-declared destructor. 9356 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 9357 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 9358 9359 CopyAssignOperator->markUsed(Context); 9360 9361 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 9362 DiagnosticErrorTrap Trap(Diags); 9363 9364 // C++0x [class.copy]p30: 9365 // The implicitly-defined or explicitly-defaulted copy assignment operator 9366 // for a non-union class X performs memberwise copy assignment of its 9367 // subobjects. The direct base classes of X are assigned first, in the 9368 // order of their declaration in the base-specifier-list, and then the 9369 // immediate non-static data members of X are assigned, in the order in 9370 // which they were declared in the class definition. 9371 9372 // The statements that form the synthesized function body. 9373 SmallVector<Stmt*, 8> Statements; 9374 9375 // The parameter for the "other" object, which we are copying from. 9376 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 9377 Qualifiers OtherQuals = Other->getType().getQualifiers(); 9378 QualType OtherRefType = Other->getType(); 9379 if (const LValueReferenceType *OtherRef 9380 = OtherRefType->getAs<LValueReferenceType>()) { 9381 OtherRefType = OtherRef->getPointeeType(); 9382 OtherQuals = OtherRefType.getQualifiers(); 9383 } 9384 9385 // Our location for everything implicitly-generated. 9386 SourceLocation Loc = CopyAssignOperator->getLocation(); 9387 9388 // Builds a DeclRefExpr for the "other" object. 9389 RefBuilder OtherRef(Other, OtherRefType); 9390 9391 // Builds the "this" pointer. 9392 ThisBuilder This; 9393 9394 // Assign base classes. 9395 bool Invalid = false; 9396 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9397 E = ClassDecl->bases_end(); Base != E; ++Base) { 9398 // Form the assignment: 9399 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 9400 QualType BaseType = Base->getType().getUnqualifiedType(); 9401 if (!BaseType->isRecordType()) { 9402 Invalid = true; 9403 continue; 9404 } 9405 9406 CXXCastPath BasePath; 9407 BasePath.push_back(Base); 9408 9409 // Construct the "from" expression, which is an implicit cast to the 9410 // appropriately-qualified base type. 9411 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), 9412 VK_LValue, BasePath); 9413 9414 // Dereference "this". 9415 DerefBuilder DerefThis(This); 9416 CastBuilder To(DerefThis, 9417 Context.getCVRQualifiedType( 9418 BaseType, CopyAssignOperator->getTypeQualifiers()), 9419 VK_LValue, BasePath); 9420 9421 // Build the copy. 9422 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 9423 To, From, 9424 /*CopyingBaseSubobject=*/true, 9425 /*Copying=*/true); 9426 if (Copy.isInvalid()) { 9427 Diag(CurrentLocation, diag::note_member_synthesized_at) 9428 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9429 CopyAssignOperator->setInvalidDecl(); 9430 return; 9431 } 9432 9433 // Success! Record the copy. 9434 Statements.push_back(Copy.takeAs<Expr>()); 9435 } 9436 9437 // Assign non-static members. 9438 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9439 FieldEnd = ClassDecl->field_end(); 9440 Field != FieldEnd; ++Field) { 9441 if (Field->isUnnamedBitfield()) 9442 continue; 9443 9444 if (Field->isInvalidDecl()) { 9445 Invalid = true; 9446 continue; 9447 } 9448 9449 // Check for members of reference type; we can't copy those. 9450 if (Field->getType()->isReferenceType()) { 9451 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9452 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9453 Diag(Field->getLocation(), diag::note_declared_at); 9454 Diag(CurrentLocation, diag::note_member_synthesized_at) 9455 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9456 Invalid = true; 9457 continue; 9458 } 9459 9460 // Check for members of const-qualified, non-class type. 9461 QualType BaseType = Context.getBaseElementType(Field->getType()); 9462 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9463 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9464 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9465 Diag(Field->getLocation(), diag::note_declared_at); 9466 Diag(CurrentLocation, diag::note_member_synthesized_at) 9467 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9468 Invalid = true; 9469 continue; 9470 } 9471 9472 // Suppress assigning zero-width bitfields. 9473 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9474 continue; 9475 9476 QualType FieldType = Field->getType().getNonReferenceType(); 9477 if (FieldType->isIncompleteArrayType()) { 9478 assert(ClassDecl->hasFlexibleArrayMember() && 9479 "Incomplete array type is not valid"); 9480 continue; 9481 } 9482 9483 // Build references to the field in the object we're copying from and to. 9484 CXXScopeSpec SS; // Intentionally empty 9485 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9486 LookupMemberName); 9487 MemberLookup.addDecl(*Field); 9488 MemberLookup.resolveKind(); 9489 9490 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); 9491 9492 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); 9493 9494 // Build the copy of this field. 9495 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9496 To, From, 9497 /*CopyingBaseSubobject=*/false, 9498 /*Copying=*/true); 9499 if (Copy.isInvalid()) { 9500 Diag(CurrentLocation, diag::note_member_synthesized_at) 9501 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9502 CopyAssignOperator->setInvalidDecl(); 9503 return; 9504 } 9505 9506 // Success! Record the copy. 9507 Statements.push_back(Copy.takeAs<Stmt>()); 9508 } 9509 9510 if (!Invalid) { 9511 // Add a "return *this;" 9512 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9513 9514 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9515 if (Return.isInvalid()) 9516 Invalid = true; 9517 else { 9518 Statements.push_back(Return.takeAs<Stmt>()); 9519 9520 if (Trap.hasErrorOccurred()) { 9521 Diag(CurrentLocation, diag::note_member_synthesized_at) 9522 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9523 Invalid = true; 9524 } 9525 } 9526 } 9527 9528 if (Invalid) { 9529 CopyAssignOperator->setInvalidDecl(); 9530 return; 9531 } 9532 9533 StmtResult Body; 9534 { 9535 CompoundScopeRAII CompoundScope(*this); 9536 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9537 /*isStmtExpr=*/false); 9538 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9539 } 9540 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9541 9542 if (ASTMutationListener *L = getASTMutationListener()) { 9543 L->CompletedImplicitDefinition(CopyAssignOperator); 9544 } 9545} 9546 9547Sema::ImplicitExceptionSpecification 9548Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9549 CXXRecordDecl *ClassDecl = MD->getParent(); 9550 9551 ImplicitExceptionSpecification ExceptSpec(*this); 9552 if (ClassDecl->isInvalidDecl()) 9553 return ExceptSpec; 9554 9555 // C++0x [except.spec]p14: 9556 // An implicitly declared special member function (Clause 12) shall have an 9557 // exception-specification. [...] 9558 9559 // It is unspecified whether or not an implicit move assignment operator 9560 // attempts to deduplicate calls to assignment operators of virtual bases are 9561 // made. As such, this exception specification is effectively unspecified. 9562 // Based on a similar decision made for constness in C++0x, we're erring on 9563 // the side of assuming such calls to be made regardless of whether they 9564 // actually happen. 9565 // Note that a move constructor is not implicitly declared when there are 9566 // virtual bases, but it can still be user-declared and explicitly defaulted. 9567 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9568 BaseEnd = ClassDecl->bases_end(); 9569 Base != BaseEnd; ++Base) { 9570 if (Base->isVirtual()) 9571 continue; 9572 9573 CXXRecordDecl *BaseClassDecl 9574 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9575 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9576 0, false, 0)) 9577 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9578 } 9579 9580 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9581 BaseEnd = ClassDecl->vbases_end(); 9582 Base != BaseEnd; ++Base) { 9583 CXXRecordDecl *BaseClassDecl 9584 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9585 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9586 0, false, 0)) 9587 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9588 } 9589 9590 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9591 FieldEnd = ClassDecl->field_end(); 9592 Field != FieldEnd; 9593 ++Field) { 9594 QualType FieldType = Context.getBaseElementType(Field->getType()); 9595 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9596 if (CXXMethodDecl *MoveAssign = 9597 LookupMovingAssignment(FieldClassDecl, 9598 FieldType.getCVRQualifiers(), 9599 false, 0)) 9600 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9601 } 9602 } 9603 9604 return ExceptSpec; 9605} 9606 9607/// Determine whether the class type has any direct or indirect virtual base 9608/// classes which have a non-trivial move assignment operator. 9609static bool 9610hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9611 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9612 BaseEnd = ClassDecl->vbases_end(); 9613 Base != BaseEnd; ++Base) { 9614 CXXRecordDecl *BaseClass = 9615 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9616 9617 // Try to declare the move assignment. If it would be deleted, then the 9618 // class does not have a non-trivial move assignment. 9619 if (BaseClass->needsImplicitMoveAssignment()) 9620 S.DeclareImplicitMoveAssignment(BaseClass); 9621 9622 if (BaseClass->hasNonTrivialMoveAssignment()) 9623 return true; 9624 } 9625 9626 return false; 9627} 9628 9629/// Determine whether the given type either has a move constructor or is 9630/// trivially copyable. 9631static bool 9632hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9633 Type = S.Context.getBaseElementType(Type); 9634 9635 // FIXME: Technically, non-trivially-copyable non-class types, such as 9636 // reference types, are supposed to return false here, but that appears 9637 // to be a standard defect. 9638 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9639 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9640 return true; 9641 9642 if (Type.isTriviallyCopyableType(S.Context)) 9643 return true; 9644 9645 if (IsConstructor) { 9646 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9647 // give the right answer. 9648 if (ClassDecl->needsImplicitMoveConstructor()) 9649 S.DeclareImplicitMoveConstructor(ClassDecl); 9650 return ClassDecl->hasMoveConstructor(); 9651 } 9652 9653 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9654 // give the right answer. 9655 if (ClassDecl->needsImplicitMoveAssignment()) 9656 S.DeclareImplicitMoveAssignment(ClassDecl); 9657 return ClassDecl->hasMoveAssignment(); 9658} 9659 9660/// Determine whether all non-static data members and direct or virtual bases 9661/// of class \p ClassDecl have either a move operation, or are trivially 9662/// copyable. 9663static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9664 bool IsConstructor) { 9665 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9666 BaseEnd = ClassDecl->bases_end(); 9667 Base != BaseEnd; ++Base) { 9668 if (Base->isVirtual()) 9669 continue; 9670 9671 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9672 return false; 9673 } 9674 9675 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9676 BaseEnd = ClassDecl->vbases_end(); 9677 Base != BaseEnd; ++Base) { 9678 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9679 return false; 9680 } 9681 9682 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9683 FieldEnd = ClassDecl->field_end(); 9684 Field != FieldEnd; ++Field) { 9685 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9686 return false; 9687 } 9688 9689 return true; 9690} 9691 9692CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9693 // C++11 [class.copy]p20: 9694 // If the definition of a class X does not explicitly declare a move 9695 // assignment operator, one will be implicitly declared as defaulted 9696 // if and only if: 9697 // 9698 // - [first 4 bullets] 9699 assert(ClassDecl->needsImplicitMoveAssignment()); 9700 9701 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9702 if (DSM.isAlreadyBeingDeclared()) 9703 return 0; 9704 9705 // [Checked after we build the declaration] 9706 // - the move assignment operator would not be implicitly defined as 9707 // deleted, 9708 9709 // [DR1402]: 9710 // - X has no direct or indirect virtual base class with a non-trivial 9711 // move assignment operator, and 9712 // - each of X's non-static data members and direct or virtual base classes 9713 // has a type that either has a move assignment operator or is trivially 9714 // copyable. 9715 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9716 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9717 ClassDecl->setFailedImplicitMoveAssignment(); 9718 return 0; 9719 } 9720 9721 // Note: The following rules are largely analoguous to the move 9722 // constructor rules. 9723 9724 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9725 QualType RetType = Context.getLValueReferenceType(ArgType); 9726 ArgType = Context.getRValueReferenceType(ArgType); 9727 9728 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9729 CXXMoveAssignment, 9730 false); 9731 9732 // An implicitly-declared move assignment operator is an inline public 9733 // member of its class. 9734 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9735 SourceLocation ClassLoc = ClassDecl->getLocation(); 9736 DeclarationNameInfo NameInfo(Name, ClassLoc); 9737 CXXMethodDecl *MoveAssignment = 9738 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9739 /*TInfo=*/0, /*StorageClass=*/SC_None, 9740 /*isInline=*/true, Constexpr, SourceLocation()); 9741 MoveAssignment->setAccess(AS_public); 9742 MoveAssignment->setDefaulted(); 9743 MoveAssignment->setImplicit(); 9744 9745 // Build an exception specification pointing back at this member. 9746 FunctionProtoType::ExtProtoInfo EPI = 9747 getImplicitMethodEPI(*this, MoveAssignment); 9748 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9749 9750 // Add the parameter to the operator. 9751 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9752 ClassLoc, ClassLoc, /*Id=*/0, 9753 ArgType, /*TInfo=*/0, 9754 SC_None, 0); 9755 MoveAssignment->setParams(FromParam); 9756 9757 AddOverriddenMethods(ClassDecl, MoveAssignment); 9758 9759 MoveAssignment->setTrivial( 9760 ClassDecl->needsOverloadResolutionForMoveAssignment() 9761 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9762 : ClassDecl->hasTrivialMoveAssignment()); 9763 9764 // C++0x [class.copy]p9: 9765 // If the definition of a class X does not explicitly declare a move 9766 // assignment operator, one will be implicitly declared as defaulted if and 9767 // only if: 9768 // [...] 9769 // - the move assignment operator would not be implicitly defined as 9770 // deleted. 9771 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9772 // Cache this result so that we don't try to generate this over and over 9773 // on every lookup, leaking memory and wasting time. 9774 ClassDecl->setFailedImplicitMoveAssignment(); 9775 return 0; 9776 } 9777 9778 // Note that we have added this copy-assignment operator. 9779 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9780 9781 if (Scope *S = getScopeForContext(ClassDecl)) 9782 PushOnScopeChains(MoveAssignment, S, false); 9783 ClassDecl->addDecl(MoveAssignment); 9784 9785 return MoveAssignment; 9786} 9787 9788void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9789 CXXMethodDecl *MoveAssignOperator) { 9790 assert((MoveAssignOperator->isDefaulted() && 9791 MoveAssignOperator->isOverloadedOperator() && 9792 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9793 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9794 !MoveAssignOperator->isDeleted()) && 9795 "DefineImplicitMoveAssignment called for wrong function"); 9796 9797 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9798 9799 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9800 MoveAssignOperator->setInvalidDecl(); 9801 return; 9802 } 9803 9804 MoveAssignOperator->markUsed(Context); 9805 9806 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9807 DiagnosticErrorTrap Trap(Diags); 9808 9809 // C++0x [class.copy]p28: 9810 // The implicitly-defined or move assignment operator for a non-union class 9811 // X performs memberwise move assignment of its subobjects. The direct base 9812 // classes of X are assigned first, in the order of their declaration in the 9813 // base-specifier-list, and then the immediate non-static data members of X 9814 // are assigned, in the order in which they were declared in the class 9815 // definition. 9816 9817 // The statements that form the synthesized function body. 9818 SmallVector<Stmt*, 8> Statements; 9819 9820 // The parameter for the "other" object, which we are move from. 9821 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9822 QualType OtherRefType = Other->getType()-> 9823 getAs<RValueReferenceType>()->getPointeeType(); 9824 assert(!OtherRefType.getQualifiers() && 9825 "Bad argument type of defaulted move assignment"); 9826 9827 // Our location for everything implicitly-generated. 9828 SourceLocation Loc = MoveAssignOperator->getLocation(); 9829 9830 // Builds a reference to the "other" object. 9831 RefBuilder OtherRef(Other, OtherRefType); 9832 // Cast to rvalue. 9833 MoveCastBuilder MoveOther(OtherRef); 9834 9835 // Builds the "this" pointer. 9836 ThisBuilder This; 9837 9838 // Assign base classes. 9839 bool Invalid = false; 9840 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9841 E = ClassDecl->bases_end(); Base != E; ++Base) { 9842 // Form the assignment: 9843 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9844 QualType BaseType = Base->getType().getUnqualifiedType(); 9845 if (!BaseType->isRecordType()) { 9846 Invalid = true; 9847 continue; 9848 } 9849 9850 CXXCastPath BasePath; 9851 BasePath.push_back(Base); 9852 9853 // Construct the "from" expression, which is an implicit cast to the 9854 // appropriately-qualified base type. 9855 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); 9856 9857 // Dereference "this". 9858 DerefBuilder DerefThis(This); 9859 9860 // Implicitly cast "this" to the appropriately-qualified base type. 9861 CastBuilder To(DerefThis, 9862 Context.getCVRQualifiedType( 9863 BaseType, MoveAssignOperator->getTypeQualifiers()), 9864 VK_LValue, BasePath); 9865 9866 // Build the move. 9867 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9868 To, From, 9869 /*CopyingBaseSubobject=*/true, 9870 /*Copying=*/false); 9871 if (Move.isInvalid()) { 9872 Diag(CurrentLocation, diag::note_member_synthesized_at) 9873 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9874 MoveAssignOperator->setInvalidDecl(); 9875 return; 9876 } 9877 9878 // Success! Record the move. 9879 Statements.push_back(Move.takeAs<Expr>()); 9880 } 9881 9882 // Assign non-static members. 9883 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9884 FieldEnd = ClassDecl->field_end(); 9885 Field != FieldEnd; ++Field) { 9886 if (Field->isUnnamedBitfield()) 9887 continue; 9888 9889 if (Field->isInvalidDecl()) { 9890 Invalid = true; 9891 continue; 9892 } 9893 9894 // Check for members of reference type; we can't move those. 9895 if (Field->getType()->isReferenceType()) { 9896 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9897 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9898 Diag(Field->getLocation(), diag::note_declared_at); 9899 Diag(CurrentLocation, diag::note_member_synthesized_at) 9900 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9901 Invalid = true; 9902 continue; 9903 } 9904 9905 // Check for members of const-qualified, non-class type. 9906 QualType BaseType = Context.getBaseElementType(Field->getType()); 9907 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9908 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9909 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9910 Diag(Field->getLocation(), diag::note_declared_at); 9911 Diag(CurrentLocation, diag::note_member_synthesized_at) 9912 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9913 Invalid = true; 9914 continue; 9915 } 9916 9917 // Suppress assigning zero-width bitfields. 9918 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9919 continue; 9920 9921 QualType FieldType = Field->getType().getNonReferenceType(); 9922 if (FieldType->isIncompleteArrayType()) { 9923 assert(ClassDecl->hasFlexibleArrayMember() && 9924 "Incomplete array type is not valid"); 9925 continue; 9926 } 9927 9928 // Build references to the field in the object we're copying from and to. 9929 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9930 LookupMemberName); 9931 MemberLookup.addDecl(*Field); 9932 MemberLookup.resolveKind(); 9933 MemberBuilder From(MoveOther, OtherRefType, 9934 /*IsArrow=*/false, MemberLookup); 9935 MemberBuilder To(This, getCurrentThisType(), 9936 /*IsArrow=*/true, MemberLookup); 9937 9938 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue 9939 "Member reference with rvalue base must be rvalue except for reference " 9940 "members, which aren't allowed for move assignment."); 9941 9942 // Build the move of this field. 9943 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9944 To, From, 9945 /*CopyingBaseSubobject=*/false, 9946 /*Copying=*/false); 9947 if (Move.isInvalid()) { 9948 Diag(CurrentLocation, diag::note_member_synthesized_at) 9949 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9950 MoveAssignOperator->setInvalidDecl(); 9951 return; 9952 } 9953 9954 // Success! Record the copy. 9955 Statements.push_back(Move.takeAs<Stmt>()); 9956 } 9957 9958 if (!Invalid) { 9959 // Add a "return *this;" 9960 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9961 9962 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9963 if (Return.isInvalid()) 9964 Invalid = true; 9965 else { 9966 Statements.push_back(Return.takeAs<Stmt>()); 9967 9968 if (Trap.hasErrorOccurred()) { 9969 Diag(CurrentLocation, diag::note_member_synthesized_at) 9970 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9971 Invalid = true; 9972 } 9973 } 9974 } 9975 9976 if (Invalid) { 9977 MoveAssignOperator->setInvalidDecl(); 9978 return; 9979 } 9980 9981 StmtResult Body; 9982 { 9983 CompoundScopeRAII CompoundScope(*this); 9984 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9985 /*isStmtExpr=*/false); 9986 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9987 } 9988 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9989 9990 if (ASTMutationListener *L = getASTMutationListener()) { 9991 L->CompletedImplicitDefinition(MoveAssignOperator); 9992 } 9993} 9994 9995Sema::ImplicitExceptionSpecification 9996Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9997 CXXRecordDecl *ClassDecl = MD->getParent(); 9998 9999 ImplicitExceptionSpecification ExceptSpec(*this); 10000 if (ClassDecl->isInvalidDecl()) 10001 return ExceptSpec; 10002 10003 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 10004 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 10005 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 10006 10007 // C++ [except.spec]p14: 10008 // An implicitly declared special member function (Clause 12) shall have an 10009 // exception-specification. [...] 10010 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 10011 BaseEnd = ClassDecl->bases_end(); 10012 Base != BaseEnd; 10013 ++Base) { 10014 // Virtual bases are handled below. 10015 if (Base->isVirtual()) 10016 continue; 10017 10018 CXXRecordDecl *BaseClassDecl 10019 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 10020 if (CXXConstructorDecl *CopyConstructor = 10021 LookupCopyingConstructor(BaseClassDecl, Quals)) 10022 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 10023 } 10024 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 10025 BaseEnd = ClassDecl->vbases_end(); 10026 Base != BaseEnd; 10027 ++Base) { 10028 CXXRecordDecl *BaseClassDecl 10029 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 10030 if (CXXConstructorDecl *CopyConstructor = 10031 LookupCopyingConstructor(BaseClassDecl, Quals)) 10032 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 10033 } 10034 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 10035 FieldEnd = ClassDecl->field_end(); 10036 Field != FieldEnd; 10037 ++Field) { 10038 QualType FieldType = Context.getBaseElementType(Field->getType()); 10039 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 10040 if (CXXConstructorDecl *CopyConstructor = 10041 LookupCopyingConstructor(FieldClassDecl, 10042 Quals | FieldType.getCVRQualifiers())) 10043 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 10044 } 10045 } 10046 10047 return ExceptSpec; 10048} 10049 10050CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 10051 CXXRecordDecl *ClassDecl) { 10052 // C++ [class.copy]p4: 10053 // If the class definition does not explicitly declare a copy 10054 // constructor, one is declared implicitly. 10055 assert(ClassDecl->needsImplicitCopyConstructor()); 10056 10057 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 10058 if (DSM.isAlreadyBeingDeclared()) 10059 return 0; 10060 10061 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10062 QualType ArgType = ClassType; 10063 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 10064 if (Const) 10065 ArgType = ArgType.withConst(); 10066 ArgType = Context.getLValueReferenceType(ArgType); 10067 10068 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10069 CXXCopyConstructor, 10070 Const); 10071 10072 DeclarationName Name 10073 = Context.DeclarationNames.getCXXConstructorName( 10074 Context.getCanonicalType(ClassType)); 10075 SourceLocation ClassLoc = ClassDecl->getLocation(); 10076 DeclarationNameInfo NameInfo(Name, ClassLoc); 10077 10078 // An implicitly-declared copy constructor is an inline public 10079 // member of its class. 10080 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 10081 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10082 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10083 Constexpr); 10084 CopyConstructor->setAccess(AS_public); 10085 CopyConstructor->setDefaulted(); 10086 10087 // Build an exception specification pointing back at this member. 10088 FunctionProtoType::ExtProtoInfo EPI = 10089 getImplicitMethodEPI(*this, CopyConstructor); 10090 CopyConstructor->setType( 10091 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10092 10093 // Add the parameter to the constructor. 10094 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 10095 ClassLoc, ClassLoc, 10096 /*IdentifierInfo=*/0, 10097 ArgType, /*TInfo=*/0, 10098 SC_None, 0); 10099 CopyConstructor->setParams(FromParam); 10100 10101 CopyConstructor->setTrivial( 10102 ClassDecl->needsOverloadResolutionForCopyConstructor() 10103 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 10104 : ClassDecl->hasTrivialCopyConstructor()); 10105 10106 // C++11 [class.copy]p8: 10107 // ... If the class definition does not explicitly declare a copy 10108 // constructor, there is no user-declared move constructor, and there is no 10109 // user-declared move assignment operator, a copy constructor is implicitly 10110 // declared as defaulted. 10111 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 10112 SetDeclDeleted(CopyConstructor, ClassLoc); 10113 10114 // Note that we have declared this constructor. 10115 ++ASTContext::NumImplicitCopyConstructorsDeclared; 10116 10117 if (Scope *S = getScopeForContext(ClassDecl)) 10118 PushOnScopeChains(CopyConstructor, S, false); 10119 ClassDecl->addDecl(CopyConstructor); 10120 10121 return CopyConstructor; 10122} 10123 10124void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 10125 CXXConstructorDecl *CopyConstructor) { 10126 assert((CopyConstructor->isDefaulted() && 10127 CopyConstructor->isCopyConstructor() && 10128 !CopyConstructor->doesThisDeclarationHaveABody() && 10129 !CopyConstructor->isDeleted()) && 10130 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 10131 10132 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 10133 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 10134 10135 // C++11 [class.copy]p7: 10136 // The [definition of an implicitly declared copy constructor] is 10137 // deprecated if the class has a user-declared copy assignment operator 10138 // or a user-declared destructor. 10139 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 10140 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 10141 10142 SynthesizedFunctionScope Scope(*this, CopyConstructor); 10143 DiagnosticErrorTrap Trap(Diags); 10144 10145 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 10146 Trap.hasErrorOccurred()) { 10147 Diag(CurrentLocation, diag::note_member_synthesized_at) 10148 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 10149 CopyConstructor->setInvalidDecl(); 10150 } else { 10151 Sema::CompoundScopeRAII CompoundScope(*this); 10152 CopyConstructor->setBody(ActOnCompoundStmt( 10153 CopyConstructor->getLocation(), CopyConstructor->getLocation(), None, 10154 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10155 } 10156 10157 CopyConstructor->markUsed(Context); 10158 if (ASTMutationListener *L = getASTMutationListener()) { 10159 L->CompletedImplicitDefinition(CopyConstructor); 10160 } 10161} 10162 10163Sema::ImplicitExceptionSpecification 10164Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 10165 CXXRecordDecl *ClassDecl = MD->getParent(); 10166 10167 // C++ [except.spec]p14: 10168 // An implicitly declared special member function (Clause 12) shall have an 10169 // exception-specification. [...] 10170 ImplicitExceptionSpecification ExceptSpec(*this); 10171 if (ClassDecl->isInvalidDecl()) 10172 return ExceptSpec; 10173 10174 // Direct base-class constructors. 10175 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 10176 BEnd = ClassDecl->bases_end(); 10177 B != BEnd; ++B) { 10178 if (B->isVirtual()) // Handled below. 10179 continue; 10180 10181 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10182 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10183 CXXConstructorDecl *Constructor = 10184 LookupMovingConstructor(BaseClassDecl, 0); 10185 // If this is a deleted function, add it anyway. This might be conformant 10186 // with the standard. This might not. I'm not sure. It might not matter. 10187 if (Constructor) 10188 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10189 } 10190 } 10191 10192 // Virtual base-class constructors. 10193 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 10194 BEnd = ClassDecl->vbases_end(); 10195 B != BEnd; ++B) { 10196 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10197 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10198 CXXConstructorDecl *Constructor = 10199 LookupMovingConstructor(BaseClassDecl, 0); 10200 // If this is a deleted function, add it anyway. This might be conformant 10201 // with the standard. This might not. I'm not sure. It might not matter. 10202 if (Constructor) 10203 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10204 } 10205 } 10206 10207 // Field constructors. 10208 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 10209 FEnd = ClassDecl->field_end(); 10210 F != FEnd; ++F) { 10211 QualType FieldType = Context.getBaseElementType(F->getType()); 10212 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 10213 CXXConstructorDecl *Constructor = 10214 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 10215 // If this is a deleted function, add it anyway. This might be conformant 10216 // with the standard. This might not. I'm not sure. It might not matter. 10217 // In particular, the problem is that this function never gets called. It 10218 // might just be ill-formed because this function attempts to refer to 10219 // a deleted function here. 10220 if (Constructor) 10221 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 10222 } 10223 } 10224 10225 return ExceptSpec; 10226} 10227 10228CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 10229 CXXRecordDecl *ClassDecl) { 10230 // C++11 [class.copy]p9: 10231 // If the definition of a class X does not explicitly declare a move 10232 // constructor, one will be implicitly declared as defaulted if and only if: 10233 // 10234 // - [first 4 bullets] 10235 assert(ClassDecl->needsImplicitMoveConstructor()); 10236 10237 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 10238 if (DSM.isAlreadyBeingDeclared()) 10239 return 0; 10240 10241 // [Checked after we build the declaration] 10242 // - the move assignment operator would not be implicitly defined as 10243 // deleted, 10244 10245 // [DR1402]: 10246 // - each of X's non-static data members and direct or virtual base classes 10247 // has a type that either has a move constructor or is trivially copyable. 10248 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 10249 ClassDecl->setFailedImplicitMoveConstructor(); 10250 return 0; 10251 } 10252 10253 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10254 QualType ArgType = Context.getRValueReferenceType(ClassType); 10255 10256 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10257 CXXMoveConstructor, 10258 false); 10259 10260 DeclarationName Name 10261 = Context.DeclarationNames.getCXXConstructorName( 10262 Context.getCanonicalType(ClassType)); 10263 SourceLocation ClassLoc = ClassDecl->getLocation(); 10264 DeclarationNameInfo NameInfo(Name, ClassLoc); 10265 10266 // C++11 [class.copy]p11: 10267 // An implicitly-declared copy/move constructor is an inline public 10268 // member of its class. 10269 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 10270 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10271 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10272 Constexpr); 10273 MoveConstructor->setAccess(AS_public); 10274 MoveConstructor->setDefaulted(); 10275 10276 // Build an exception specification pointing back at this member. 10277 FunctionProtoType::ExtProtoInfo EPI = 10278 getImplicitMethodEPI(*this, MoveConstructor); 10279 MoveConstructor->setType( 10280 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10281 10282 // Add the parameter to the constructor. 10283 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 10284 ClassLoc, ClassLoc, 10285 /*IdentifierInfo=*/0, 10286 ArgType, /*TInfo=*/0, 10287 SC_None, 0); 10288 MoveConstructor->setParams(FromParam); 10289 10290 MoveConstructor->setTrivial( 10291 ClassDecl->needsOverloadResolutionForMoveConstructor() 10292 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 10293 : ClassDecl->hasTrivialMoveConstructor()); 10294 10295 // C++0x [class.copy]p9: 10296 // If the definition of a class X does not explicitly declare a move 10297 // constructor, one will be implicitly declared as defaulted if and only if: 10298 // [...] 10299 // - the move constructor would not be implicitly defined as deleted. 10300 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 10301 // Cache this result so that we don't try to generate this over and over 10302 // on every lookup, leaking memory and wasting time. 10303 ClassDecl->setFailedImplicitMoveConstructor(); 10304 return 0; 10305 } 10306 10307 // Note that we have declared this constructor. 10308 ++ASTContext::NumImplicitMoveConstructorsDeclared; 10309 10310 if (Scope *S = getScopeForContext(ClassDecl)) 10311 PushOnScopeChains(MoveConstructor, S, false); 10312 ClassDecl->addDecl(MoveConstructor); 10313 10314 return MoveConstructor; 10315} 10316 10317void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 10318 CXXConstructorDecl *MoveConstructor) { 10319 assert((MoveConstructor->isDefaulted() && 10320 MoveConstructor->isMoveConstructor() && 10321 !MoveConstructor->doesThisDeclarationHaveABody() && 10322 !MoveConstructor->isDeleted()) && 10323 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 10324 10325 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 10326 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 10327 10328 SynthesizedFunctionScope Scope(*this, MoveConstructor); 10329 DiagnosticErrorTrap Trap(Diags); 10330 10331 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 10332 Trap.hasErrorOccurred()) { 10333 Diag(CurrentLocation, diag::note_member_synthesized_at) 10334 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 10335 MoveConstructor->setInvalidDecl(); 10336 } else { 10337 Sema::CompoundScopeRAII CompoundScope(*this); 10338 MoveConstructor->setBody(ActOnCompoundStmt( 10339 MoveConstructor->getLocation(), MoveConstructor->getLocation(), None, 10340 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10341 } 10342 10343 MoveConstructor->markUsed(Context); 10344 10345 if (ASTMutationListener *L = getASTMutationListener()) { 10346 L->CompletedImplicitDefinition(MoveConstructor); 10347 } 10348} 10349 10350bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 10351 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); 10352} 10353 10354/// \brief Mark the call operator of the given lambda closure type as "used". 10355static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 10356 CXXMethodDecl *CallOperator 10357 = cast<CXXMethodDecl>( 10358 Lambda->lookup( 10359 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 10360 CallOperator->setReferenced(); 10361 CallOperator->markUsed(S.Context); 10362} 10363 10364void Sema::DefineImplicitLambdaToFunctionPointerConversion( 10365 SourceLocation CurrentLocation, 10366 CXXConversionDecl *Conv) 10367{ 10368 CXXRecordDecl *LambdaClass = Conv->getParent(); 10369 10370 // Make sure that the lambda call operator is marked used. 10371 markLambdaCallOperatorUsed(*this, LambdaClass); 10372 10373 Conv->markUsed(Context); 10374 10375 SynthesizedFunctionScope Scope(*this, Conv); 10376 DiagnosticErrorTrap Trap(Diags); 10377 10378 // Return the address of the __invoke function. 10379 10380 CXXMethodDecl *Invoke = LambdaClass->getLambdaStaticInvoker(); 10381 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 10382 VK_LValue, Conv->getLocation()).take(); 10383 assert(FunctionRef && "Can't refer to lambda static invoker function?"); 10384 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 10385 Conv->setBody(new (Context) CompoundStmt(Context, Return, 10386 Conv->getLocation(), 10387 Conv->getLocation())); 10388 10389 // Fill in the static invoker function with a dummy implementation. 10390 // IR generation will fill in the actual details. 10391 Invoke->markUsed(Context); 10392 Invoke->setReferenced(); 10393 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 10394 10395 if (ASTMutationListener *L = getASTMutationListener()) { 10396 L->CompletedImplicitDefinition(Conv); 10397 L->CompletedImplicitDefinition(Invoke); 10398 } 10399} 10400 10401void Sema::DefineImplicitLambdaToBlockPointerConversion( 10402 SourceLocation CurrentLocation, 10403 CXXConversionDecl *Conv) 10404{ 10405 Conv->markUsed(Context); 10406 10407 SynthesizedFunctionScope Scope(*this, Conv); 10408 DiagnosticErrorTrap Trap(Diags); 10409 10410 // Copy-initialize the lambda object as needed to capture it. 10411 Expr *This = ActOnCXXThis(CurrentLocation).take(); 10412 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 10413 10414 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 10415 Conv->getLocation(), 10416 Conv, DerefThis); 10417 10418 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 10419 // behavior. Note that only the general conversion function does this 10420 // (since it's unusable otherwise); in the case where we inline the 10421 // block literal, it has block literal lifetime semantics. 10422 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 10423 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 10424 CK_CopyAndAutoreleaseBlockObject, 10425 BuildBlock.get(), 0, VK_RValue); 10426 10427 if (BuildBlock.isInvalid()) { 10428 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10429 Conv->setInvalidDecl(); 10430 return; 10431 } 10432 10433 // Create the return statement that returns the block from the conversion 10434 // function. 10435 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10436 if (Return.isInvalid()) { 10437 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10438 Conv->setInvalidDecl(); 10439 return; 10440 } 10441 10442 // Set the body of the conversion function. 10443 Stmt *ReturnS = Return.take(); 10444 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10445 Conv->getLocation(), 10446 Conv->getLocation())); 10447 10448 // We're done; notify the mutation listener, if any. 10449 if (ASTMutationListener *L = getASTMutationListener()) { 10450 L->CompletedImplicitDefinition(Conv); 10451 } 10452} 10453 10454/// \brief Determine whether the given list arguments contains exactly one 10455/// "real" (non-default) argument. 10456static bool hasOneRealArgument(MultiExprArg Args) { 10457 switch (Args.size()) { 10458 case 0: 10459 return false; 10460 10461 default: 10462 if (!Args[1]->isDefaultArgument()) 10463 return false; 10464 10465 // fall through 10466 case 1: 10467 return !Args[0]->isDefaultArgument(); 10468 } 10469 10470 return false; 10471} 10472 10473ExprResult 10474Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10475 CXXConstructorDecl *Constructor, 10476 MultiExprArg ExprArgs, 10477 bool HadMultipleCandidates, 10478 bool IsListInitialization, 10479 bool RequiresZeroInit, 10480 unsigned ConstructKind, 10481 SourceRange ParenRange) { 10482 bool Elidable = false; 10483 10484 // C++0x [class.copy]p34: 10485 // When certain criteria are met, an implementation is allowed to 10486 // omit the copy/move construction of a class object, even if the 10487 // copy/move constructor and/or destructor for the object have 10488 // side effects. [...] 10489 // - when a temporary class object that has not been bound to a 10490 // reference (12.2) would be copied/moved to a class object 10491 // with the same cv-unqualified type, the copy/move operation 10492 // can be omitted by constructing the temporary object 10493 // directly into the target of the omitted copy/move 10494 if (ConstructKind == CXXConstructExpr::CK_Complete && 10495 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10496 Expr *SubExpr = ExprArgs[0]; 10497 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10498 } 10499 10500 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10501 Elidable, ExprArgs, HadMultipleCandidates, 10502 IsListInitialization, RequiresZeroInit, 10503 ConstructKind, ParenRange); 10504} 10505 10506/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10507/// including handling of its default argument expressions. 10508ExprResult 10509Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10510 CXXConstructorDecl *Constructor, bool Elidable, 10511 MultiExprArg ExprArgs, 10512 bool HadMultipleCandidates, 10513 bool IsListInitialization, 10514 bool RequiresZeroInit, 10515 unsigned ConstructKind, 10516 SourceRange ParenRange) { 10517 MarkFunctionReferenced(ConstructLoc, Constructor); 10518 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10519 Constructor, Elidable, ExprArgs, 10520 HadMultipleCandidates, 10521 IsListInitialization, RequiresZeroInit, 10522 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10523 ParenRange)); 10524} 10525 10526void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10527 if (VD->isInvalidDecl()) return; 10528 10529 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10530 if (ClassDecl->isInvalidDecl()) return; 10531 if (ClassDecl->hasIrrelevantDestructor()) return; 10532 if (ClassDecl->isDependentContext()) return; 10533 10534 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10535 MarkFunctionReferenced(VD->getLocation(), Destructor); 10536 CheckDestructorAccess(VD->getLocation(), Destructor, 10537 PDiag(diag::err_access_dtor_var) 10538 << VD->getDeclName() 10539 << VD->getType()); 10540 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10541 10542 if (!VD->hasGlobalStorage()) return; 10543 10544 // Emit warning for non-trivial dtor in global scope (a real global, 10545 // class-static, function-static). 10546 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10547 10548 // TODO: this should be re-enabled for static locals by !CXAAtExit 10549 if (!VD->isStaticLocal()) 10550 Diag(VD->getLocation(), diag::warn_global_destructor); 10551} 10552 10553/// \brief Given a constructor and the set of arguments provided for the 10554/// constructor, convert the arguments and add any required default arguments 10555/// to form a proper call to this constructor. 10556/// 10557/// \returns true if an error occurred, false otherwise. 10558bool 10559Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10560 MultiExprArg ArgsPtr, 10561 SourceLocation Loc, 10562 SmallVectorImpl<Expr*> &ConvertedArgs, 10563 bool AllowExplicit, 10564 bool IsListInitialization) { 10565 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10566 unsigned NumArgs = ArgsPtr.size(); 10567 Expr **Args = ArgsPtr.data(); 10568 10569 const FunctionProtoType *Proto 10570 = Constructor->getType()->getAs<FunctionProtoType>(); 10571 assert(Proto && "Constructor without a prototype?"); 10572 unsigned NumArgsInProto = Proto->getNumArgs(); 10573 10574 // If too few arguments are available, we'll fill in the rest with defaults. 10575 if (NumArgs < NumArgsInProto) 10576 ConvertedArgs.reserve(NumArgsInProto); 10577 else 10578 ConvertedArgs.reserve(NumArgs); 10579 10580 VariadicCallType CallType = 10581 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10582 SmallVector<Expr *, 8> AllArgs; 10583 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10584 Proto, 0, 10585 llvm::makeArrayRef(Args, NumArgs), 10586 AllArgs, 10587 CallType, AllowExplicit, 10588 IsListInitialization); 10589 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10590 10591 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10592 10593 CheckConstructorCall(Constructor, 10594 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10595 AllArgs.size()), 10596 Proto, Loc); 10597 10598 return Invalid; 10599} 10600 10601static inline bool 10602CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10603 const FunctionDecl *FnDecl) { 10604 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10605 if (isa<NamespaceDecl>(DC)) { 10606 return SemaRef.Diag(FnDecl->getLocation(), 10607 diag::err_operator_new_delete_declared_in_namespace) 10608 << FnDecl->getDeclName(); 10609 } 10610 10611 if (isa<TranslationUnitDecl>(DC) && 10612 FnDecl->getStorageClass() == SC_Static) { 10613 return SemaRef.Diag(FnDecl->getLocation(), 10614 diag::err_operator_new_delete_declared_static) 10615 << FnDecl->getDeclName(); 10616 } 10617 10618 return false; 10619} 10620 10621static inline bool 10622CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10623 CanQualType ExpectedResultType, 10624 CanQualType ExpectedFirstParamType, 10625 unsigned DependentParamTypeDiag, 10626 unsigned InvalidParamTypeDiag) { 10627 QualType ResultType = 10628 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10629 10630 // Check that the result type is not dependent. 10631 if (ResultType->isDependentType()) 10632 return SemaRef.Diag(FnDecl->getLocation(), 10633 diag::err_operator_new_delete_dependent_result_type) 10634 << FnDecl->getDeclName() << ExpectedResultType; 10635 10636 // Check that the result type is what we expect. 10637 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10638 return SemaRef.Diag(FnDecl->getLocation(), 10639 diag::err_operator_new_delete_invalid_result_type) 10640 << FnDecl->getDeclName() << ExpectedResultType; 10641 10642 // A function template must have at least 2 parameters. 10643 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10644 return SemaRef.Diag(FnDecl->getLocation(), 10645 diag::err_operator_new_delete_template_too_few_parameters) 10646 << FnDecl->getDeclName(); 10647 10648 // The function decl must have at least 1 parameter. 10649 if (FnDecl->getNumParams() == 0) 10650 return SemaRef.Diag(FnDecl->getLocation(), 10651 diag::err_operator_new_delete_too_few_parameters) 10652 << FnDecl->getDeclName(); 10653 10654 // Check the first parameter type is not dependent. 10655 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10656 if (FirstParamType->isDependentType()) 10657 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10658 << FnDecl->getDeclName() << ExpectedFirstParamType; 10659 10660 // Check that the first parameter type is what we expect. 10661 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10662 ExpectedFirstParamType) 10663 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10664 << FnDecl->getDeclName() << ExpectedFirstParamType; 10665 10666 return false; 10667} 10668 10669static bool 10670CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10671 // C++ [basic.stc.dynamic.allocation]p1: 10672 // A program is ill-formed if an allocation function is declared in a 10673 // namespace scope other than global scope or declared static in global 10674 // scope. 10675 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10676 return true; 10677 10678 CanQualType SizeTy = 10679 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10680 10681 // C++ [basic.stc.dynamic.allocation]p1: 10682 // The return type shall be void*. The first parameter shall have type 10683 // std::size_t. 10684 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10685 SizeTy, 10686 diag::err_operator_new_dependent_param_type, 10687 diag::err_operator_new_param_type)) 10688 return true; 10689 10690 // C++ [basic.stc.dynamic.allocation]p1: 10691 // The first parameter shall not have an associated default argument. 10692 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10693 return SemaRef.Diag(FnDecl->getLocation(), 10694 diag::err_operator_new_default_arg) 10695 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10696 10697 return false; 10698} 10699 10700static bool 10701CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10702 // C++ [basic.stc.dynamic.deallocation]p1: 10703 // A program is ill-formed if deallocation functions are declared in a 10704 // namespace scope other than global scope or declared static in global 10705 // scope. 10706 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10707 return true; 10708 10709 // C++ [basic.stc.dynamic.deallocation]p2: 10710 // Each deallocation function shall return void and its first parameter 10711 // shall be void*. 10712 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10713 SemaRef.Context.VoidPtrTy, 10714 diag::err_operator_delete_dependent_param_type, 10715 diag::err_operator_delete_param_type)) 10716 return true; 10717 10718 return false; 10719} 10720 10721/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10722/// of this overloaded operator is well-formed. If so, returns false; 10723/// otherwise, emits appropriate diagnostics and returns true. 10724bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10725 assert(FnDecl && FnDecl->isOverloadedOperator() && 10726 "Expected an overloaded operator declaration"); 10727 10728 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10729 10730 // C++ [over.oper]p5: 10731 // The allocation and deallocation functions, operator new, 10732 // operator new[], operator delete and operator delete[], are 10733 // described completely in 3.7.3. The attributes and restrictions 10734 // found in the rest of this subclause do not apply to them unless 10735 // explicitly stated in 3.7.3. 10736 if (Op == OO_Delete || Op == OO_Array_Delete) 10737 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10738 10739 if (Op == OO_New || Op == OO_Array_New) 10740 return CheckOperatorNewDeclaration(*this, FnDecl); 10741 10742 // C++ [over.oper]p6: 10743 // An operator function shall either be a non-static member 10744 // function or be a non-member function and have at least one 10745 // parameter whose type is a class, a reference to a class, an 10746 // enumeration, or a reference to an enumeration. 10747 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10748 if (MethodDecl->isStatic()) 10749 return Diag(FnDecl->getLocation(), 10750 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10751 } else { 10752 bool ClassOrEnumParam = false; 10753 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10754 ParamEnd = FnDecl->param_end(); 10755 Param != ParamEnd; ++Param) { 10756 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10757 if (ParamType->isDependentType() || ParamType->isRecordType() || 10758 ParamType->isEnumeralType()) { 10759 ClassOrEnumParam = true; 10760 break; 10761 } 10762 } 10763 10764 if (!ClassOrEnumParam) 10765 return Diag(FnDecl->getLocation(), 10766 diag::err_operator_overload_needs_class_or_enum) 10767 << FnDecl->getDeclName(); 10768 } 10769 10770 // C++ [over.oper]p8: 10771 // An operator function cannot have default arguments (8.3.6), 10772 // except where explicitly stated below. 10773 // 10774 // Only the function-call operator allows default arguments 10775 // (C++ [over.call]p1). 10776 if (Op != OO_Call) { 10777 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10778 Param != FnDecl->param_end(); ++Param) { 10779 if ((*Param)->hasDefaultArg()) 10780 return Diag((*Param)->getLocation(), 10781 diag::err_operator_overload_default_arg) 10782 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10783 } 10784 } 10785 10786 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10787 { false, false, false } 10788#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10789 , { Unary, Binary, MemberOnly } 10790#include "clang/Basic/OperatorKinds.def" 10791 }; 10792 10793 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10794 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10795 bool MustBeMemberOperator = OperatorUses[Op][2]; 10796 10797 // C++ [over.oper]p8: 10798 // [...] Operator functions cannot have more or fewer parameters 10799 // than the number required for the corresponding operator, as 10800 // described in the rest of this subclause. 10801 unsigned NumParams = FnDecl->getNumParams() 10802 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10803 if (Op != OO_Call && 10804 ((NumParams == 1 && !CanBeUnaryOperator) || 10805 (NumParams == 2 && !CanBeBinaryOperator) || 10806 (NumParams < 1) || (NumParams > 2))) { 10807 // We have the wrong number of parameters. 10808 unsigned ErrorKind; 10809 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10810 ErrorKind = 2; // 2 -> unary or binary. 10811 } else if (CanBeUnaryOperator) { 10812 ErrorKind = 0; // 0 -> unary 10813 } else { 10814 assert(CanBeBinaryOperator && 10815 "All non-call overloaded operators are unary or binary!"); 10816 ErrorKind = 1; // 1 -> binary 10817 } 10818 10819 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10820 << FnDecl->getDeclName() << NumParams << ErrorKind; 10821 } 10822 10823 // Overloaded operators other than operator() cannot be variadic. 10824 if (Op != OO_Call && 10825 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10826 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10827 << FnDecl->getDeclName(); 10828 } 10829 10830 // Some operators must be non-static member functions. 10831 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10832 return Diag(FnDecl->getLocation(), 10833 diag::err_operator_overload_must_be_member) 10834 << FnDecl->getDeclName(); 10835 } 10836 10837 // C++ [over.inc]p1: 10838 // The user-defined function called operator++ implements the 10839 // prefix and postfix ++ operator. If this function is a member 10840 // function with no parameters, or a non-member function with one 10841 // parameter of class or enumeration type, it defines the prefix 10842 // increment operator ++ for objects of that type. If the function 10843 // is a member function with one parameter (which shall be of type 10844 // int) or a non-member function with two parameters (the second 10845 // of which shall be of type int), it defines the postfix 10846 // increment operator ++ for objects of that type. 10847 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10848 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10849 bool ParamIsInt = false; 10850 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10851 ParamIsInt = BT->getKind() == BuiltinType::Int; 10852 10853 if (!ParamIsInt) 10854 return Diag(LastParam->getLocation(), 10855 diag::err_operator_overload_post_incdec_must_be_int) 10856 << LastParam->getType() << (Op == OO_MinusMinus); 10857 } 10858 10859 return false; 10860} 10861 10862/// CheckLiteralOperatorDeclaration - Check whether the declaration 10863/// of this literal operator function is well-formed. If so, returns 10864/// false; otherwise, emits appropriate diagnostics and returns true. 10865bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10866 if (isa<CXXMethodDecl>(FnDecl)) { 10867 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10868 << FnDecl->getDeclName(); 10869 return true; 10870 } 10871 10872 if (FnDecl->isExternC()) { 10873 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10874 return true; 10875 } 10876 10877 bool Valid = false; 10878 10879 // This might be the definition of a literal operator template. 10880 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10881 // This might be a specialization of a literal operator template. 10882 if (!TpDecl) 10883 TpDecl = FnDecl->getPrimaryTemplate(); 10884 10885 // template <char...> type operator "" name() is the only valid template 10886 // signature, and the only valid signature with no parameters. 10887 if (TpDecl) { 10888 if (FnDecl->param_size() == 0) { 10889 // Must have only one template parameter 10890 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10891 if (Params->size() == 1) { 10892 NonTypeTemplateParmDecl *PmDecl = 10893 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10894 10895 // The template parameter must be a char parameter pack. 10896 if (PmDecl && PmDecl->isTemplateParameterPack() && 10897 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10898 Valid = true; 10899 } 10900 } 10901 } else if (FnDecl->param_size()) { 10902 // Check the first parameter 10903 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10904 10905 QualType T = (*Param)->getType().getUnqualifiedType(); 10906 10907 // unsigned long long int, long double, and any character type are allowed 10908 // as the only parameters. 10909 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10910 Context.hasSameType(T, Context.LongDoubleTy) || 10911 Context.hasSameType(T, Context.CharTy) || 10912 Context.hasSameType(T, Context.WideCharTy) || 10913 Context.hasSameType(T, Context.Char16Ty) || 10914 Context.hasSameType(T, Context.Char32Ty)) { 10915 if (++Param == FnDecl->param_end()) 10916 Valid = true; 10917 goto FinishedParams; 10918 } 10919 10920 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10921 const PointerType *PT = T->getAs<PointerType>(); 10922 if (!PT) 10923 goto FinishedParams; 10924 T = PT->getPointeeType(); 10925 if (!T.isConstQualified() || T.isVolatileQualified()) 10926 goto FinishedParams; 10927 T = T.getUnqualifiedType(); 10928 10929 // Move on to the second parameter; 10930 ++Param; 10931 10932 // If there is no second parameter, the first must be a const char * 10933 if (Param == FnDecl->param_end()) { 10934 if (Context.hasSameType(T, Context.CharTy)) 10935 Valid = true; 10936 goto FinishedParams; 10937 } 10938 10939 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10940 // are allowed as the first parameter to a two-parameter function 10941 if (!(Context.hasSameType(T, Context.CharTy) || 10942 Context.hasSameType(T, Context.WideCharTy) || 10943 Context.hasSameType(T, Context.Char16Ty) || 10944 Context.hasSameType(T, Context.Char32Ty))) 10945 goto FinishedParams; 10946 10947 // The second and final parameter must be an std::size_t 10948 T = (*Param)->getType().getUnqualifiedType(); 10949 if (Context.hasSameType(T, Context.getSizeType()) && 10950 ++Param == FnDecl->param_end()) 10951 Valid = true; 10952 } 10953 10954 // FIXME: This diagnostic is absolutely terrible. 10955FinishedParams: 10956 if (!Valid) { 10957 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10958 << FnDecl->getDeclName(); 10959 return true; 10960 } 10961 10962 // A parameter-declaration-clause containing a default argument is not 10963 // equivalent to any of the permitted forms. 10964 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10965 ParamEnd = FnDecl->param_end(); 10966 Param != ParamEnd; ++Param) { 10967 if ((*Param)->hasDefaultArg()) { 10968 Diag((*Param)->getDefaultArgRange().getBegin(), 10969 diag::err_literal_operator_default_argument) 10970 << (*Param)->getDefaultArgRange(); 10971 break; 10972 } 10973 } 10974 10975 StringRef LiteralName 10976 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10977 if (LiteralName[0] != '_') { 10978 // C++11 [usrlit.suffix]p1: 10979 // Literal suffix identifiers that do not start with an underscore 10980 // are reserved for future standardization. 10981 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) 10982 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); 10983 } 10984 10985 return false; 10986} 10987 10988/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10989/// linkage specification, including the language and (if present) 10990/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10991/// the location of the language string literal, which is provided 10992/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10993/// the '{' brace. Otherwise, this linkage specification does not 10994/// have any braces. 10995Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10996 SourceLocation LangLoc, 10997 StringRef Lang, 10998 SourceLocation LBraceLoc) { 10999 LinkageSpecDecl::LanguageIDs Language; 11000 if (Lang == "\"C\"") 11001 Language = LinkageSpecDecl::lang_c; 11002 else if (Lang == "\"C++\"") 11003 Language = LinkageSpecDecl::lang_cxx; 11004 else { 11005 Diag(LangLoc, diag::err_bad_language); 11006 return 0; 11007 } 11008 11009 // FIXME: Add all the various semantics of linkage specifications 11010 11011 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 11012 ExternLoc, LangLoc, Language, 11013 LBraceLoc.isValid()); 11014 CurContext->addDecl(D); 11015 PushDeclContext(S, D); 11016 return D; 11017} 11018 11019/// ActOnFinishLinkageSpecification - Complete the definition of 11020/// the C++ linkage specification LinkageSpec. If RBraceLoc is 11021/// valid, it's the position of the closing '}' brace in a linkage 11022/// specification that uses braces. 11023Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 11024 Decl *LinkageSpec, 11025 SourceLocation RBraceLoc) { 11026 if (LinkageSpec) { 11027 if (RBraceLoc.isValid()) { 11028 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 11029 LSDecl->setRBraceLoc(RBraceLoc); 11030 } 11031 PopDeclContext(); 11032 } 11033 return LinkageSpec; 11034} 11035 11036Decl *Sema::ActOnEmptyDeclaration(Scope *S, 11037 AttributeList *AttrList, 11038 SourceLocation SemiLoc) { 11039 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 11040 // Attribute declarations appertain to empty declaration so we handle 11041 // them here. 11042 if (AttrList) 11043 ProcessDeclAttributeList(S, ED, AttrList); 11044 11045 CurContext->addDecl(ED); 11046 return ED; 11047} 11048 11049/// \brief Perform semantic analysis for the variable declaration that 11050/// occurs within a C++ catch clause, returning the newly-created 11051/// variable. 11052VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 11053 TypeSourceInfo *TInfo, 11054 SourceLocation StartLoc, 11055 SourceLocation Loc, 11056 IdentifierInfo *Name) { 11057 bool Invalid = false; 11058 QualType ExDeclType = TInfo->getType(); 11059 11060 // Arrays and functions decay. 11061 if (ExDeclType->isArrayType()) 11062 ExDeclType = Context.getArrayDecayedType(ExDeclType); 11063 else if (ExDeclType->isFunctionType()) 11064 ExDeclType = Context.getPointerType(ExDeclType); 11065 11066 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 11067 // The exception-declaration shall not denote a pointer or reference to an 11068 // incomplete type, other than [cv] void*. 11069 // N2844 forbids rvalue references. 11070 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 11071 Diag(Loc, diag::err_catch_rvalue_ref); 11072 Invalid = true; 11073 } 11074 11075 QualType BaseType = ExDeclType; 11076 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 11077 unsigned DK = diag::err_catch_incomplete; 11078 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 11079 BaseType = Ptr->getPointeeType(); 11080 Mode = 1; 11081 DK = diag::err_catch_incomplete_ptr; 11082 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 11083 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 11084 BaseType = Ref->getPointeeType(); 11085 Mode = 2; 11086 DK = diag::err_catch_incomplete_ref; 11087 } 11088 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 11089 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 11090 Invalid = true; 11091 11092 if (!Invalid && !ExDeclType->isDependentType() && 11093 RequireNonAbstractType(Loc, ExDeclType, 11094 diag::err_abstract_type_in_decl, 11095 AbstractVariableType)) 11096 Invalid = true; 11097 11098 // Only the non-fragile NeXT runtime currently supports C++ catches 11099 // of ObjC types, and no runtime supports catching ObjC types by value. 11100 if (!Invalid && getLangOpts().ObjC1) { 11101 QualType T = ExDeclType; 11102 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 11103 T = RT->getPointeeType(); 11104 11105 if (T->isObjCObjectType()) { 11106 Diag(Loc, diag::err_objc_object_catch); 11107 Invalid = true; 11108 } else if (T->isObjCObjectPointerType()) { 11109 // FIXME: should this be a test for macosx-fragile specifically? 11110 if (getLangOpts().ObjCRuntime.isFragile()) 11111 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 11112 } 11113 } 11114 11115 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 11116 ExDeclType, TInfo, SC_None); 11117 ExDecl->setExceptionVariable(true); 11118 11119 // In ARC, infer 'retaining' for variables of retainable type. 11120 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 11121 Invalid = true; 11122 11123 if (!Invalid && !ExDeclType->isDependentType()) { 11124 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 11125 // Insulate this from anything else we might currently be parsing. 11126 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 11127 11128 // C++ [except.handle]p16: 11129 // The object declared in an exception-declaration or, if the 11130 // exception-declaration does not specify a name, a temporary (12.2) is 11131 // copy-initialized (8.5) from the exception object. [...] 11132 // The object is destroyed when the handler exits, after the destruction 11133 // of any automatic objects initialized within the handler. 11134 // 11135 // We just pretend to initialize the object with itself, then make sure 11136 // it can be destroyed later. 11137 QualType initType = ExDeclType; 11138 11139 InitializedEntity entity = 11140 InitializedEntity::InitializeVariable(ExDecl); 11141 InitializationKind initKind = 11142 InitializationKind::CreateCopy(Loc, SourceLocation()); 11143 11144 Expr *opaqueValue = 11145 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 11146 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 11147 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 11148 if (result.isInvalid()) 11149 Invalid = true; 11150 else { 11151 // If the constructor used was non-trivial, set this as the 11152 // "initializer". 11153 CXXConstructExpr *construct = result.takeAs<CXXConstructExpr>(); 11154 if (!construct->getConstructor()->isTrivial()) { 11155 Expr *init = MaybeCreateExprWithCleanups(construct); 11156 ExDecl->setInit(init); 11157 } 11158 11159 // And make sure it's destructable. 11160 FinalizeVarWithDestructor(ExDecl, recordType); 11161 } 11162 } 11163 } 11164 11165 if (Invalid) 11166 ExDecl->setInvalidDecl(); 11167 11168 return ExDecl; 11169} 11170 11171/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 11172/// handler. 11173Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 11174 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11175 bool Invalid = D.isInvalidType(); 11176 11177 // Check for unexpanded parameter packs. 11178 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 11179 UPPC_ExceptionType)) { 11180 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 11181 D.getIdentifierLoc()); 11182 Invalid = true; 11183 } 11184 11185 IdentifierInfo *II = D.getIdentifier(); 11186 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 11187 LookupOrdinaryName, 11188 ForRedeclaration)) { 11189 // The scope should be freshly made just for us. There is just no way 11190 // it contains any previous declaration. 11191 assert(!S->isDeclScope(PrevDecl)); 11192 if (PrevDecl->isTemplateParameter()) { 11193 // Maybe we will complain about the shadowed template parameter. 11194 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 11195 PrevDecl = 0; 11196 } 11197 } 11198 11199 if (D.getCXXScopeSpec().isSet() && !Invalid) { 11200 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 11201 << D.getCXXScopeSpec().getRange(); 11202 Invalid = true; 11203 } 11204 11205 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 11206 D.getLocStart(), 11207 D.getIdentifierLoc(), 11208 D.getIdentifier()); 11209 if (Invalid) 11210 ExDecl->setInvalidDecl(); 11211 11212 // Add the exception declaration into this scope. 11213 if (II) 11214 PushOnScopeChains(ExDecl, S); 11215 else 11216 CurContext->addDecl(ExDecl); 11217 11218 ProcessDeclAttributes(S, ExDecl, D); 11219 return ExDecl; 11220} 11221 11222Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11223 Expr *AssertExpr, 11224 Expr *AssertMessageExpr, 11225 SourceLocation RParenLoc) { 11226 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 11227 11228 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 11229 return 0; 11230 11231 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 11232 AssertMessage, RParenLoc, false); 11233} 11234 11235Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11236 Expr *AssertExpr, 11237 StringLiteral *AssertMessage, 11238 SourceLocation RParenLoc, 11239 bool Failed) { 11240 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 11241 !Failed) { 11242 // In a static_assert-declaration, the constant-expression shall be a 11243 // constant expression that can be contextually converted to bool. 11244 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 11245 if (Converted.isInvalid()) 11246 Failed = true; 11247 11248 llvm::APSInt Cond; 11249 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 11250 diag::err_static_assert_expression_is_not_constant, 11251 /*AllowFold=*/false).isInvalid()) 11252 Failed = true; 11253 11254 if (!Failed && !Cond) { 11255 SmallString<256> MsgBuffer; 11256 llvm::raw_svector_ostream Msg(MsgBuffer); 11257 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 11258 Diag(StaticAssertLoc, diag::err_static_assert_failed) 11259 << Msg.str() << AssertExpr->getSourceRange(); 11260 Failed = true; 11261 } 11262 } 11263 11264 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 11265 AssertExpr, AssertMessage, RParenLoc, 11266 Failed); 11267 11268 CurContext->addDecl(Decl); 11269 return Decl; 11270} 11271 11272/// \brief Perform semantic analysis of the given friend type declaration. 11273/// 11274/// \returns A friend declaration that. 11275FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 11276 SourceLocation FriendLoc, 11277 TypeSourceInfo *TSInfo) { 11278 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 11279 11280 QualType T = TSInfo->getType(); 11281 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 11282 11283 // C++03 [class.friend]p2: 11284 // An elaborated-type-specifier shall be used in a friend declaration 11285 // for a class.* 11286 // 11287 // * The class-key of the elaborated-type-specifier is required. 11288 if (!ActiveTemplateInstantiations.empty()) { 11289 // Do not complain about the form of friend template types during 11290 // template instantiation; we will already have complained when the 11291 // template was declared. 11292 } else { 11293 if (!T->isElaboratedTypeSpecifier()) { 11294 // If we evaluated the type to a record type, suggest putting 11295 // a tag in front. 11296 if (const RecordType *RT = T->getAs<RecordType>()) { 11297 RecordDecl *RD = RT->getDecl(); 11298 11299 std::string InsertionText = std::string(" ") + RD->getKindName(); 11300 11301 Diag(TypeRange.getBegin(), 11302 getLangOpts().CPlusPlus11 ? 11303 diag::warn_cxx98_compat_unelaborated_friend_type : 11304 diag::ext_unelaborated_friend_type) 11305 << (unsigned) RD->getTagKind() 11306 << T 11307 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 11308 InsertionText); 11309 } else { 11310 Diag(FriendLoc, 11311 getLangOpts().CPlusPlus11 ? 11312 diag::warn_cxx98_compat_nonclass_type_friend : 11313 diag::ext_nonclass_type_friend) 11314 << T 11315 << TypeRange; 11316 } 11317 } else if (T->getAs<EnumType>()) { 11318 Diag(FriendLoc, 11319 getLangOpts().CPlusPlus11 ? 11320 diag::warn_cxx98_compat_enum_friend : 11321 diag::ext_enum_friend) 11322 << T 11323 << TypeRange; 11324 } 11325 11326 // C++11 [class.friend]p3: 11327 // A friend declaration that does not declare a function shall have one 11328 // of the following forms: 11329 // friend elaborated-type-specifier ; 11330 // friend simple-type-specifier ; 11331 // friend typename-specifier ; 11332 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 11333 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 11334 } 11335 11336 // If the type specifier in a friend declaration designates a (possibly 11337 // cv-qualified) class type, that class is declared as a friend; otherwise, 11338 // the friend declaration is ignored. 11339 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 11340} 11341 11342/// Handle a friend tag declaration where the scope specifier was 11343/// templated. 11344Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 11345 unsigned TagSpec, SourceLocation TagLoc, 11346 CXXScopeSpec &SS, 11347 IdentifierInfo *Name, 11348 SourceLocation NameLoc, 11349 AttributeList *Attr, 11350 MultiTemplateParamsArg TempParamLists) { 11351 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 11352 11353 bool isExplicitSpecialization = false; 11354 bool Invalid = false; 11355 11356 if (TemplateParameterList *TemplateParams = 11357 MatchTemplateParametersToScopeSpecifier( 11358 TagLoc, NameLoc, SS, TempParamLists, /*friend*/ true, 11359 isExplicitSpecialization, Invalid)) { 11360 if (TemplateParams->size() > 0) { 11361 // This is a declaration of a class template. 11362 if (Invalid) 11363 return 0; 11364 11365 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 11366 SS, Name, NameLoc, Attr, 11367 TemplateParams, AS_public, 11368 /*ModulePrivateLoc=*/SourceLocation(), 11369 TempParamLists.size() - 1, 11370 TempParamLists.data()).take(); 11371 } else { 11372 // The "template<>" header is extraneous. 11373 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 11374 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 11375 isExplicitSpecialization = true; 11376 } 11377 } 11378 11379 if (Invalid) return 0; 11380 11381 bool isAllExplicitSpecializations = true; 11382 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 11383 if (TempParamLists[I]->size()) { 11384 isAllExplicitSpecializations = false; 11385 break; 11386 } 11387 } 11388 11389 // FIXME: don't ignore attributes. 11390 11391 // If it's explicit specializations all the way down, just forget 11392 // about the template header and build an appropriate non-templated 11393 // friend. TODO: for source fidelity, remember the headers. 11394 if (isAllExplicitSpecializations) { 11395 if (SS.isEmpty()) { 11396 bool Owned = false; 11397 bool IsDependent = false; 11398 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 11399 Attr, AS_public, 11400 /*ModulePrivateLoc=*/SourceLocation(), 11401 MultiTemplateParamsArg(), Owned, IsDependent, 11402 /*ScopedEnumKWLoc=*/SourceLocation(), 11403 /*ScopedEnumUsesClassTag=*/false, 11404 /*UnderlyingType=*/TypeResult()); 11405 } 11406 11407 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 11408 ElaboratedTypeKeyword Keyword 11409 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11410 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 11411 *Name, NameLoc); 11412 if (T.isNull()) 11413 return 0; 11414 11415 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11416 if (isa<DependentNameType>(T)) { 11417 DependentNameTypeLoc TL = 11418 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11419 TL.setElaboratedKeywordLoc(TagLoc); 11420 TL.setQualifierLoc(QualifierLoc); 11421 TL.setNameLoc(NameLoc); 11422 } else { 11423 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 11424 TL.setElaboratedKeywordLoc(TagLoc); 11425 TL.setQualifierLoc(QualifierLoc); 11426 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 11427 } 11428 11429 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11430 TSI, FriendLoc, TempParamLists); 11431 Friend->setAccess(AS_public); 11432 CurContext->addDecl(Friend); 11433 return Friend; 11434 } 11435 11436 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11437 11438 11439 11440 // Handle the case of a templated-scope friend class. e.g. 11441 // template <class T> class A<T>::B; 11442 // FIXME: we don't support these right now. 11443 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11444 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11445 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11446 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11447 TL.setElaboratedKeywordLoc(TagLoc); 11448 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11449 TL.setNameLoc(NameLoc); 11450 11451 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11452 TSI, FriendLoc, TempParamLists); 11453 Friend->setAccess(AS_public); 11454 Friend->setUnsupportedFriend(true); 11455 CurContext->addDecl(Friend); 11456 return Friend; 11457} 11458 11459 11460/// Handle a friend type declaration. This works in tandem with 11461/// ActOnTag. 11462/// 11463/// Notes on friend class templates: 11464/// 11465/// We generally treat friend class declarations as if they were 11466/// declaring a class. So, for example, the elaborated type specifier 11467/// in a friend declaration is required to obey the restrictions of a 11468/// class-head (i.e. no typedefs in the scope chain), template 11469/// parameters are required to match up with simple template-ids, &c. 11470/// However, unlike when declaring a template specialization, it's 11471/// okay to refer to a template specialization without an empty 11472/// template parameter declaration, e.g. 11473/// friend class A<T>::B<unsigned>; 11474/// We permit this as a special case; if there are any template 11475/// parameters present at all, require proper matching, i.e. 11476/// template <> template \<class T> friend class A<int>::B; 11477Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11478 MultiTemplateParamsArg TempParams) { 11479 SourceLocation Loc = DS.getLocStart(); 11480 11481 assert(DS.isFriendSpecified()); 11482 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11483 11484 // Try to convert the decl specifier to a type. This works for 11485 // friend templates because ActOnTag never produces a ClassTemplateDecl 11486 // for a TUK_Friend. 11487 Declarator TheDeclarator(DS, Declarator::MemberContext); 11488 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11489 QualType T = TSI->getType(); 11490 if (TheDeclarator.isInvalidType()) 11491 return 0; 11492 11493 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11494 return 0; 11495 11496 // This is definitely an error in C++98. It's probably meant to 11497 // be forbidden in C++0x, too, but the specification is just 11498 // poorly written. 11499 // 11500 // The problem is with declarations like the following: 11501 // template <T> friend A<T>::foo; 11502 // where deciding whether a class C is a friend or not now hinges 11503 // on whether there exists an instantiation of A that causes 11504 // 'foo' to equal C. There are restrictions on class-heads 11505 // (which we declare (by fiat) elaborated friend declarations to 11506 // be) that makes this tractable. 11507 // 11508 // FIXME: handle "template <> friend class A<T>;", which 11509 // is possibly well-formed? Who even knows? 11510 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11511 Diag(Loc, diag::err_tagless_friend_type_template) 11512 << DS.getSourceRange(); 11513 return 0; 11514 } 11515 11516 // C++98 [class.friend]p1: A friend of a class is a function 11517 // or class that is not a member of the class . . . 11518 // This is fixed in DR77, which just barely didn't make the C++03 11519 // deadline. It's also a very silly restriction that seriously 11520 // affects inner classes and which nobody else seems to implement; 11521 // thus we never diagnose it, not even in -pedantic. 11522 // 11523 // But note that we could warn about it: it's always useless to 11524 // friend one of your own members (it's not, however, worthless to 11525 // friend a member of an arbitrary specialization of your template). 11526 11527 Decl *D; 11528 if (unsigned NumTempParamLists = TempParams.size()) 11529 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11530 NumTempParamLists, 11531 TempParams.data(), 11532 TSI, 11533 DS.getFriendSpecLoc()); 11534 else 11535 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11536 11537 if (!D) 11538 return 0; 11539 11540 D->setAccess(AS_public); 11541 CurContext->addDecl(D); 11542 11543 return D; 11544} 11545 11546NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11547 MultiTemplateParamsArg TemplateParams) { 11548 const DeclSpec &DS = D.getDeclSpec(); 11549 11550 assert(DS.isFriendSpecified()); 11551 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11552 11553 SourceLocation Loc = D.getIdentifierLoc(); 11554 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11555 11556 // C++ [class.friend]p1 11557 // A friend of a class is a function or class.... 11558 // Note that this sees through typedefs, which is intended. 11559 // It *doesn't* see through dependent types, which is correct 11560 // according to [temp.arg.type]p3: 11561 // If a declaration acquires a function type through a 11562 // type dependent on a template-parameter and this causes 11563 // a declaration that does not use the syntactic form of a 11564 // function declarator to have a function type, the program 11565 // is ill-formed. 11566 if (!TInfo->getType()->isFunctionType()) { 11567 Diag(Loc, diag::err_unexpected_friend); 11568 11569 // It might be worthwhile to try to recover by creating an 11570 // appropriate declaration. 11571 return 0; 11572 } 11573 11574 // C++ [namespace.memdef]p3 11575 // - If a friend declaration in a non-local class first declares a 11576 // class or function, the friend class or function is a member 11577 // of the innermost enclosing namespace. 11578 // - The name of the friend is not found by simple name lookup 11579 // until a matching declaration is provided in that namespace 11580 // scope (either before or after the class declaration granting 11581 // friendship). 11582 // - If a friend function is called, its name may be found by the 11583 // name lookup that considers functions from namespaces and 11584 // classes associated with the types of the function arguments. 11585 // - When looking for a prior declaration of a class or a function 11586 // declared as a friend, scopes outside the innermost enclosing 11587 // namespace scope are not considered. 11588 11589 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11590 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11591 DeclarationName Name = NameInfo.getName(); 11592 assert(Name); 11593 11594 // Check for unexpanded parameter packs. 11595 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11596 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11597 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11598 return 0; 11599 11600 // The context we found the declaration in, or in which we should 11601 // create the declaration. 11602 DeclContext *DC; 11603 Scope *DCScope = S; 11604 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11605 ForRedeclaration); 11606 11607 // There are five cases here. 11608 // - There's no scope specifier and we're in a local class. Only look 11609 // for functions declared in the immediately-enclosing block scope. 11610 // We recover from invalid scope qualifiers as if they just weren't there. 11611 FunctionDecl *FunctionContainingLocalClass = 0; 11612 if ((SS.isInvalid() || !SS.isSet()) && 11613 (FunctionContainingLocalClass = 11614 cast<CXXRecordDecl>(CurContext)->isLocalClass())) { 11615 // C++11 [class.friend]p11: 11616 // If a friend declaration appears in a local class and the name 11617 // specified is an unqualified name, a prior declaration is 11618 // looked up without considering scopes that are outside the 11619 // innermost enclosing non-class scope. For a friend function 11620 // declaration, if there is no prior declaration, the program is 11621 // ill-formed. 11622 11623 // Find the innermost enclosing non-class scope. This is the block 11624 // scope containing the local class definition (or for a nested class, 11625 // the outer local class). 11626 DCScope = S->getFnParent(); 11627 11628 // Look up the function name in the scope. 11629 Previous.clear(LookupLocalFriendName); 11630 LookupName(Previous, S, /*AllowBuiltinCreation*/false); 11631 11632 if (!Previous.empty()) { 11633 // All possible previous declarations must have the same context: 11634 // either they were declared at block scope or they are members of 11635 // one of the enclosing local classes. 11636 DC = Previous.getRepresentativeDecl()->getDeclContext(); 11637 } else { 11638 // This is ill-formed, but provide the context that we would have 11639 // declared the function in, if we were permitted to, for error recovery. 11640 DC = FunctionContainingLocalClass; 11641 } 11642 adjustContextForLocalExternDecl(DC); 11643 11644 // C++ [class.friend]p6: 11645 // A function can be defined in a friend declaration of a class if and 11646 // only if the class is a non-local class (9.8), the function name is 11647 // unqualified, and the function has namespace scope. 11648 if (D.isFunctionDefinition()) { 11649 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11650 } 11651 11652 // - There's no scope specifier, in which case we just go to the 11653 // appropriate scope and look for a function or function template 11654 // there as appropriate. 11655 } else if (SS.isInvalid() || !SS.isSet()) { 11656 // C++11 [namespace.memdef]p3: 11657 // If the name in a friend declaration is neither qualified nor 11658 // a template-id and the declaration is a function or an 11659 // elaborated-type-specifier, the lookup to determine whether 11660 // the entity has been previously declared shall not consider 11661 // any scopes outside the innermost enclosing namespace. 11662 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11663 11664 // Find the appropriate context according to the above. 11665 DC = CurContext; 11666 11667 // Skip class contexts. If someone can cite chapter and verse 11668 // for this behavior, that would be nice --- it's what GCC and 11669 // EDG do, and it seems like a reasonable intent, but the spec 11670 // really only says that checks for unqualified existing 11671 // declarations should stop at the nearest enclosing namespace, 11672 // not that they should only consider the nearest enclosing 11673 // namespace. 11674 while (DC->isRecord()) 11675 DC = DC->getParent(); 11676 11677 DeclContext *LookupDC = DC; 11678 while (LookupDC->isTransparentContext()) 11679 LookupDC = LookupDC->getParent(); 11680 11681 while (true) { 11682 LookupQualifiedName(Previous, LookupDC); 11683 11684 if (!Previous.empty()) { 11685 DC = LookupDC; 11686 break; 11687 } 11688 11689 if (isTemplateId) { 11690 if (isa<TranslationUnitDecl>(LookupDC)) break; 11691 } else { 11692 if (LookupDC->isFileContext()) break; 11693 } 11694 LookupDC = LookupDC->getParent(); 11695 } 11696 11697 DCScope = getScopeForDeclContext(S, DC); 11698 11699 // - There's a non-dependent scope specifier, in which case we 11700 // compute it and do a previous lookup there for a function 11701 // or function template. 11702 } else if (!SS.getScopeRep()->isDependent()) { 11703 DC = computeDeclContext(SS); 11704 if (!DC) return 0; 11705 11706 if (RequireCompleteDeclContext(SS, DC)) return 0; 11707 11708 LookupQualifiedName(Previous, DC); 11709 11710 // Ignore things found implicitly in the wrong scope. 11711 // TODO: better diagnostics for this case. Suggesting the right 11712 // qualified scope would be nice... 11713 LookupResult::Filter F = Previous.makeFilter(); 11714 while (F.hasNext()) { 11715 NamedDecl *D = F.next(); 11716 if (!DC->InEnclosingNamespaceSetOf( 11717 D->getDeclContext()->getRedeclContext())) 11718 F.erase(); 11719 } 11720 F.done(); 11721 11722 if (Previous.empty()) { 11723 D.setInvalidType(); 11724 Diag(Loc, diag::err_qualified_friend_not_found) 11725 << Name << TInfo->getType(); 11726 return 0; 11727 } 11728 11729 // C++ [class.friend]p1: A friend of a class is a function or 11730 // class that is not a member of the class . . . 11731 if (DC->Equals(CurContext)) 11732 Diag(DS.getFriendSpecLoc(), 11733 getLangOpts().CPlusPlus11 ? 11734 diag::warn_cxx98_compat_friend_is_member : 11735 diag::err_friend_is_member); 11736 11737 if (D.isFunctionDefinition()) { 11738 // C++ [class.friend]p6: 11739 // A function can be defined in a friend declaration of a class if and 11740 // only if the class is a non-local class (9.8), the function name is 11741 // unqualified, and the function has namespace scope. 11742 SemaDiagnosticBuilder DB 11743 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11744 11745 DB << SS.getScopeRep(); 11746 if (DC->isFileContext()) 11747 DB << FixItHint::CreateRemoval(SS.getRange()); 11748 SS.clear(); 11749 } 11750 11751 // - There's a scope specifier that does not match any template 11752 // parameter lists, in which case we use some arbitrary context, 11753 // create a method or method template, and wait for instantiation. 11754 // - There's a scope specifier that does match some template 11755 // parameter lists, which we don't handle right now. 11756 } else { 11757 if (D.isFunctionDefinition()) { 11758 // C++ [class.friend]p6: 11759 // A function can be defined in a friend declaration of a class if and 11760 // only if the class is a non-local class (9.8), the function name is 11761 // unqualified, and the function has namespace scope. 11762 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11763 << SS.getScopeRep(); 11764 } 11765 11766 DC = CurContext; 11767 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11768 } 11769 11770 if (!DC->isRecord()) { 11771 // This implies that it has to be an operator or function. 11772 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11773 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11774 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11775 Diag(Loc, diag::err_introducing_special_friend) << 11776 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11777 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11778 return 0; 11779 } 11780 } 11781 11782 // FIXME: This is an egregious hack to cope with cases where the scope stack 11783 // does not contain the declaration context, i.e., in an out-of-line 11784 // definition of a class. 11785 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11786 if (!DCScope) { 11787 FakeDCScope.setEntity(DC); 11788 DCScope = &FakeDCScope; 11789 } 11790 11791 bool AddToScope = true; 11792 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11793 TemplateParams, AddToScope); 11794 if (!ND) return 0; 11795 11796 assert(ND->getLexicalDeclContext() == CurContext); 11797 11798 // If we performed typo correction, we might have added a scope specifier 11799 // and changed the decl context. 11800 DC = ND->getDeclContext(); 11801 11802 // Add the function declaration to the appropriate lookup tables, 11803 // adjusting the redeclarations list as necessary. We don't 11804 // want to do this yet if the friending class is dependent. 11805 // 11806 // Also update the scope-based lookup if the target context's 11807 // lookup context is in lexical scope. 11808 if (!CurContext->isDependentContext()) { 11809 DC = DC->getRedeclContext(); 11810 DC->makeDeclVisibleInContext(ND); 11811 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11812 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11813 } 11814 11815 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11816 D.getIdentifierLoc(), ND, 11817 DS.getFriendSpecLoc()); 11818 FrD->setAccess(AS_public); 11819 CurContext->addDecl(FrD); 11820 11821 if (ND->isInvalidDecl()) { 11822 FrD->setInvalidDecl(); 11823 } else { 11824 if (DC->isRecord()) CheckFriendAccess(ND); 11825 11826 FunctionDecl *FD; 11827 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11828 FD = FTD->getTemplatedDecl(); 11829 else 11830 FD = cast<FunctionDecl>(ND); 11831 11832 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a 11833 // default argument expression, that declaration shall be a definition 11834 // and shall be the only declaration of the function or function 11835 // template in the translation unit. 11836 if (functionDeclHasDefaultArgument(FD)) { 11837 if (FunctionDecl *OldFD = FD->getPreviousDecl()) { 11838 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 11839 Diag(OldFD->getLocation(), diag::note_previous_declaration); 11840 } else if (!D.isFunctionDefinition()) 11841 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); 11842 } 11843 11844 // Mark templated-scope function declarations as unsupported. 11845 if (FD->getNumTemplateParameterLists()) 11846 FrD->setUnsupportedFriend(true); 11847 } 11848 11849 return ND; 11850} 11851 11852void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11853 AdjustDeclIfTemplate(Dcl); 11854 11855 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11856 if (!Fn) { 11857 Diag(DelLoc, diag::err_deleted_non_function); 11858 return; 11859 } 11860 11861 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11862 // Don't consider the implicit declaration we generate for explicit 11863 // specializations. FIXME: Do not generate these implicit declarations. 11864 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11865 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11866 Diag(DelLoc, diag::err_deleted_decl_not_first); 11867 Diag(Prev->getLocation(), diag::note_previous_declaration); 11868 } 11869 // If the declaration wasn't the first, we delete the function anyway for 11870 // recovery. 11871 Fn = Fn->getCanonicalDecl(); 11872 } 11873 11874 if (Fn->isDeleted()) 11875 return; 11876 11877 // See if we're deleting a function which is already known to override a 11878 // non-deleted virtual function. 11879 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11880 bool IssuedDiagnostic = false; 11881 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11882 E = MD->end_overridden_methods(); 11883 I != E; ++I) { 11884 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11885 if (!IssuedDiagnostic) { 11886 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11887 IssuedDiagnostic = true; 11888 } 11889 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11890 } 11891 } 11892 } 11893 11894 Fn->setDeletedAsWritten(); 11895} 11896 11897void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11898 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11899 11900 if (MD) { 11901 if (MD->getParent()->isDependentType()) { 11902 MD->setDefaulted(); 11903 MD->setExplicitlyDefaulted(); 11904 return; 11905 } 11906 11907 CXXSpecialMember Member = getSpecialMember(MD); 11908 if (Member == CXXInvalid) { 11909 if (!MD->isInvalidDecl()) 11910 Diag(DefaultLoc, diag::err_default_special_members); 11911 return; 11912 } 11913 11914 MD->setDefaulted(); 11915 MD->setExplicitlyDefaulted(); 11916 11917 // If this definition appears within the record, do the checking when 11918 // the record is complete. 11919 const FunctionDecl *Primary = MD; 11920 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11921 // Find the uninstantiated declaration that actually had the '= default' 11922 // on it. 11923 Pattern->isDefined(Primary); 11924 11925 // If the method was defaulted on its first declaration, we will have 11926 // already performed the checking in CheckCompletedCXXClass. Such a 11927 // declaration doesn't trigger an implicit definition. 11928 if (Primary == Primary->getCanonicalDecl()) 11929 return; 11930 11931 CheckExplicitlyDefaultedSpecialMember(MD); 11932 11933 // The exception specification is needed because we are defining the 11934 // function. 11935 ResolveExceptionSpec(DefaultLoc, 11936 MD->getType()->castAs<FunctionProtoType>()); 11937 11938 if (MD->isInvalidDecl()) 11939 return; 11940 11941 switch (Member) { 11942 case CXXDefaultConstructor: 11943 DefineImplicitDefaultConstructor(DefaultLoc, 11944 cast<CXXConstructorDecl>(MD)); 11945 break; 11946 case CXXCopyConstructor: 11947 DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11948 break; 11949 case CXXCopyAssignment: 11950 DefineImplicitCopyAssignment(DefaultLoc, MD); 11951 break; 11952 case CXXDestructor: 11953 DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); 11954 break; 11955 case CXXMoveConstructor: 11956 DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11957 break; 11958 case CXXMoveAssignment: 11959 DefineImplicitMoveAssignment(DefaultLoc, MD); 11960 break; 11961 case CXXInvalid: 11962 llvm_unreachable("Invalid special member."); 11963 } 11964 } else { 11965 Diag(DefaultLoc, diag::err_default_special_members); 11966 } 11967} 11968 11969static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11970 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11971 Stmt *SubStmt = *CI; 11972 if (!SubStmt) 11973 continue; 11974 if (isa<ReturnStmt>(SubStmt)) 11975 Self.Diag(SubStmt->getLocStart(), 11976 diag::err_return_in_constructor_handler); 11977 if (!isa<Expr>(SubStmt)) 11978 SearchForReturnInStmt(Self, SubStmt); 11979 } 11980} 11981 11982void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11983 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11984 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11985 SearchForReturnInStmt(*this, Handler); 11986 } 11987} 11988 11989bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11990 const CXXMethodDecl *Old) { 11991 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11992 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11993 11994 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11995 11996 // If the calling conventions match, everything is fine 11997 if (NewCC == OldCC) 11998 return false; 11999 12000 Diag(New->getLocation(), 12001 diag::err_conflicting_overriding_cc_attributes) 12002 << New->getDeclName() << New->getType() << Old->getType(); 12003 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12004 return true; 12005} 12006 12007bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 12008 const CXXMethodDecl *Old) { 12009 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 12010 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 12011 12012 if (Context.hasSameType(NewTy, OldTy) || 12013 NewTy->isDependentType() || OldTy->isDependentType()) 12014 return false; 12015 12016 // Check if the return types are covariant 12017 QualType NewClassTy, OldClassTy; 12018 12019 /// Both types must be pointers or references to classes. 12020 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 12021 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 12022 NewClassTy = NewPT->getPointeeType(); 12023 OldClassTy = OldPT->getPointeeType(); 12024 } 12025 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 12026 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 12027 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 12028 NewClassTy = NewRT->getPointeeType(); 12029 OldClassTy = OldRT->getPointeeType(); 12030 } 12031 } 12032 } 12033 12034 // The return types aren't either both pointers or references to a class type. 12035 if (NewClassTy.isNull()) { 12036 Diag(New->getLocation(), 12037 diag::err_different_return_type_for_overriding_virtual_function) 12038 << New->getDeclName() << NewTy << OldTy; 12039 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12040 12041 return true; 12042 } 12043 12044 // C++ [class.virtual]p6: 12045 // If the return type of D::f differs from the return type of B::f, the 12046 // class type in the return type of D::f shall be complete at the point of 12047 // declaration of D::f or shall be the class type D. 12048 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 12049 if (!RT->isBeingDefined() && 12050 RequireCompleteType(New->getLocation(), NewClassTy, 12051 diag::err_covariant_return_incomplete, 12052 New->getDeclName())) 12053 return true; 12054 } 12055 12056 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 12057 // Check if the new class derives from the old class. 12058 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 12059 Diag(New->getLocation(), 12060 diag::err_covariant_return_not_derived) 12061 << New->getDeclName() << NewTy << OldTy; 12062 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12063 return true; 12064 } 12065 12066 // Check if we the conversion from derived to base is valid. 12067 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 12068 diag::err_covariant_return_inaccessible_base, 12069 diag::err_covariant_return_ambiguous_derived_to_base_conv, 12070 // FIXME: Should this point to the return type? 12071 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 12072 // FIXME: this note won't trigger for delayed access control 12073 // diagnostics, and it's impossible to get an undelayed error 12074 // here from access control during the original parse because 12075 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 12076 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12077 return true; 12078 } 12079 } 12080 12081 // The qualifiers of the return types must be the same. 12082 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 12083 Diag(New->getLocation(), 12084 diag::err_covariant_return_type_different_qualifications) 12085 << New->getDeclName() << NewTy << OldTy; 12086 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12087 return true; 12088 }; 12089 12090 12091 // The new class type must have the same or less qualifiers as the old type. 12092 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 12093 Diag(New->getLocation(), 12094 diag::err_covariant_return_type_class_type_more_qualified) 12095 << New->getDeclName() << NewTy << OldTy; 12096 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12097 return true; 12098 }; 12099 12100 return false; 12101} 12102 12103/// \brief Mark the given method pure. 12104/// 12105/// \param Method the method to be marked pure. 12106/// 12107/// \param InitRange the source range that covers the "0" initializer. 12108bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 12109 SourceLocation EndLoc = InitRange.getEnd(); 12110 if (EndLoc.isValid()) 12111 Method->setRangeEnd(EndLoc); 12112 12113 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 12114 Method->setPure(); 12115 return false; 12116 } 12117 12118 if (!Method->isInvalidDecl()) 12119 Diag(Method->getLocation(), diag::err_non_virtual_pure) 12120 << Method->getDeclName() << InitRange; 12121 return true; 12122} 12123 12124/// \brief Determine whether the given declaration is a static data member. 12125static bool isStaticDataMember(const Decl *D) { 12126 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) 12127 return Var->isStaticDataMember(); 12128 12129 return false; 12130} 12131 12132/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 12133/// an initializer for the out-of-line declaration 'Dcl'. The scope 12134/// is a fresh scope pushed for just this purpose. 12135/// 12136/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 12137/// static data member of class X, names should be looked up in the scope of 12138/// class X. 12139void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 12140 // If there is no declaration, there was an error parsing it. 12141 if (D == 0 || D->isInvalidDecl()) return; 12142 12143 // We should only get called for declarations with scope specifiers, like: 12144 // int foo::bar; 12145 assert(D->isOutOfLine()); 12146 EnterDeclaratorContext(S, D->getDeclContext()); 12147 12148 // If we are parsing the initializer for a static data member, push a 12149 // new expression evaluation context that is associated with this static 12150 // data member. 12151 if (isStaticDataMember(D)) 12152 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 12153} 12154 12155/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 12156/// initializer for the out-of-line declaration 'D'. 12157void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 12158 // If there is no declaration, there was an error parsing it. 12159 if (D == 0 || D->isInvalidDecl()) return; 12160 12161 if (isStaticDataMember(D)) 12162 PopExpressionEvaluationContext(); 12163 12164 assert(D->isOutOfLine()); 12165 ExitDeclaratorContext(S); 12166} 12167 12168/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 12169/// C++ if/switch/while/for statement. 12170/// e.g: "if (int x = f()) {...}" 12171DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 12172 // C++ 6.4p2: 12173 // The declarator shall not specify a function or an array. 12174 // The type-specifier-seq shall not contain typedef and shall not declare a 12175 // new class or enumeration. 12176 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 12177 "Parser allowed 'typedef' as storage class of condition decl."); 12178 12179 Decl *Dcl = ActOnDeclarator(S, D); 12180 if (!Dcl) 12181 return true; 12182 12183 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 12184 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 12185 << D.getSourceRange(); 12186 return true; 12187 } 12188 12189 return Dcl; 12190} 12191 12192void Sema::LoadExternalVTableUses() { 12193 if (!ExternalSource) 12194 return; 12195 12196 SmallVector<ExternalVTableUse, 4> VTables; 12197 ExternalSource->ReadUsedVTables(VTables); 12198 SmallVector<VTableUse, 4> NewUses; 12199 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 12200 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 12201 = VTablesUsed.find(VTables[I].Record); 12202 // Even if a definition wasn't required before, it may be required now. 12203 if (Pos != VTablesUsed.end()) { 12204 if (!Pos->second && VTables[I].DefinitionRequired) 12205 Pos->second = true; 12206 continue; 12207 } 12208 12209 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 12210 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 12211 } 12212 12213 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 12214} 12215 12216void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 12217 bool DefinitionRequired) { 12218 // Ignore any vtable uses in unevaluated operands or for classes that do 12219 // not have a vtable. 12220 if (!Class->isDynamicClass() || Class->isDependentContext() || 12221 CurContext->isDependentContext() || isUnevaluatedContext()) 12222 return; 12223 12224 // Try to insert this class into the map. 12225 LoadExternalVTableUses(); 12226 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12227 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 12228 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 12229 if (!Pos.second) { 12230 // If we already had an entry, check to see if we are promoting this vtable 12231 // to required a definition. If so, we need to reappend to the VTableUses 12232 // list, since we may have already processed the first entry. 12233 if (DefinitionRequired && !Pos.first->second) { 12234 Pos.first->second = true; 12235 } else { 12236 // Otherwise, we can early exit. 12237 return; 12238 } 12239 } 12240 12241 // Local classes need to have their virtual members marked 12242 // immediately. For all other classes, we mark their virtual members 12243 // at the end of the translation unit. 12244 if (Class->isLocalClass()) 12245 MarkVirtualMembersReferenced(Loc, Class); 12246 else 12247 VTableUses.push_back(std::make_pair(Class, Loc)); 12248} 12249 12250bool Sema::DefineUsedVTables() { 12251 LoadExternalVTableUses(); 12252 if (VTableUses.empty()) 12253 return false; 12254 12255 // Note: The VTableUses vector could grow as a result of marking 12256 // the members of a class as "used", so we check the size each 12257 // time through the loop and prefer indices (which are stable) to 12258 // iterators (which are not). 12259 bool DefinedAnything = false; 12260 for (unsigned I = 0; I != VTableUses.size(); ++I) { 12261 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 12262 if (!Class) 12263 continue; 12264 12265 SourceLocation Loc = VTableUses[I].second; 12266 12267 bool DefineVTable = true; 12268 12269 // If this class has a key function, but that key function is 12270 // defined in another translation unit, we don't need to emit the 12271 // vtable even though we're using it. 12272 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 12273 if (KeyFunction && !KeyFunction->hasBody()) { 12274 // The key function is in another translation unit. 12275 DefineVTable = false; 12276 TemplateSpecializationKind TSK = 12277 KeyFunction->getTemplateSpecializationKind(); 12278 assert(TSK != TSK_ExplicitInstantiationDefinition && 12279 TSK != TSK_ImplicitInstantiation && 12280 "Instantiations don't have key functions"); 12281 (void)TSK; 12282 } else if (!KeyFunction) { 12283 // If we have a class with no key function that is the subject 12284 // of an explicit instantiation declaration, suppress the 12285 // vtable; it will live with the explicit instantiation 12286 // definition. 12287 bool IsExplicitInstantiationDeclaration 12288 = Class->getTemplateSpecializationKind() 12289 == TSK_ExplicitInstantiationDeclaration; 12290 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 12291 REnd = Class->redecls_end(); 12292 R != REnd; ++R) { 12293 TemplateSpecializationKind TSK 12294 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 12295 if (TSK == TSK_ExplicitInstantiationDeclaration) 12296 IsExplicitInstantiationDeclaration = true; 12297 else if (TSK == TSK_ExplicitInstantiationDefinition) { 12298 IsExplicitInstantiationDeclaration = false; 12299 break; 12300 } 12301 } 12302 12303 if (IsExplicitInstantiationDeclaration) 12304 DefineVTable = false; 12305 } 12306 12307 // The exception specifications for all virtual members may be needed even 12308 // if we are not providing an authoritative form of the vtable in this TU. 12309 // We may choose to emit it available_externally anyway. 12310 if (!DefineVTable) { 12311 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 12312 continue; 12313 } 12314 12315 // Mark all of the virtual members of this class as referenced, so 12316 // that we can build a vtable. Then, tell the AST consumer that a 12317 // vtable for this class is required. 12318 DefinedAnything = true; 12319 MarkVirtualMembersReferenced(Loc, Class); 12320 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12321 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 12322 12323 // Optionally warn if we're emitting a weak vtable. 12324 if (Class->isExternallyVisible() && 12325 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 12326 const FunctionDecl *KeyFunctionDef = 0; 12327 if (!KeyFunction || 12328 (KeyFunction->hasBody(KeyFunctionDef) && 12329 KeyFunctionDef->isInlined())) 12330 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 12331 TSK_ExplicitInstantiationDefinition 12332 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 12333 << Class; 12334 } 12335 } 12336 VTableUses.clear(); 12337 12338 return DefinedAnything; 12339} 12340 12341void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 12342 const CXXRecordDecl *RD) { 12343 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 12344 E = RD->method_end(); I != E; ++I) 12345 if ((*I)->isVirtual() && !(*I)->isPure()) 12346 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 12347} 12348 12349void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 12350 const CXXRecordDecl *RD) { 12351 // Mark all functions which will appear in RD's vtable as used. 12352 CXXFinalOverriderMap FinalOverriders; 12353 RD->getFinalOverriders(FinalOverriders); 12354 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 12355 E = FinalOverriders.end(); 12356 I != E; ++I) { 12357 for (OverridingMethods::const_iterator OI = I->second.begin(), 12358 OE = I->second.end(); 12359 OI != OE; ++OI) { 12360 assert(OI->second.size() > 0 && "no final overrider"); 12361 CXXMethodDecl *Overrider = OI->second.front().Method; 12362 12363 // C++ [basic.def.odr]p2: 12364 // [...] A virtual member function is used if it is not pure. [...] 12365 if (!Overrider->isPure()) 12366 MarkFunctionReferenced(Loc, Overrider); 12367 } 12368 } 12369 12370 // Only classes that have virtual bases need a VTT. 12371 if (RD->getNumVBases() == 0) 12372 return; 12373 12374 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 12375 e = RD->bases_end(); i != e; ++i) { 12376 const CXXRecordDecl *Base = 12377 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 12378 if (Base->getNumVBases() == 0) 12379 continue; 12380 MarkVirtualMembersReferenced(Loc, Base); 12381 } 12382} 12383 12384/// SetIvarInitializers - This routine builds initialization ASTs for the 12385/// Objective-C implementation whose ivars need be initialized. 12386void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 12387 if (!getLangOpts().CPlusPlus) 12388 return; 12389 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 12390 SmallVector<ObjCIvarDecl*, 8> ivars; 12391 CollectIvarsToConstructOrDestruct(OID, ivars); 12392 if (ivars.empty()) 12393 return; 12394 SmallVector<CXXCtorInitializer*, 32> AllToInit; 12395 for (unsigned i = 0; i < ivars.size(); i++) { 12396 FieldDecl *Field = ivars[i]; 12397 if (Field->isInvalidDecl()) 12398 continue; 12399 12400 CXXCtorInitializer *Member; 12401 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 12402 InitializationKind InitKind = 12403 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 12404 12405 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 12406 ExprResult MemberInit = 12407 InitSeq.Perform(*this, InitEntity, InitKind, None); 12408 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 12409 // Note, MemberInit could actually come back empty if no initialization 12410 // is required (e.g., because it would call a trivial default constructor) 12411 if (!MemberInit.get() || MemberInit.isInvalid()) 12412 continue; 12413 12414 Member = 12415 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 12416 SourceLocation(), 12417 MemberInit.takeAs<Expr>(), 12418 SourceLocation()); 12419 AllToInit.push_back(Member); 12420 12421 // Be sure that the destructor is accessible and is marked as referenced. 12422 if (const RecordType *RecordTy 12423 = Context.getBaseElementType(Field->getType()) 12424 ->getAs<RecordType>()) { 12425 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 12426 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 12427 MarkFunctionReferenced(Field->getLocation(), Destructor); 12428 CheckDestructorAccess(Field->getLocation(), Destructor, 12429 PDiag(diag::err_access_dtor_ivar) 12430 << Context.getBaseElementType(Field->getType())); 12431 } 12432 } 12433 } 12434 ObjCImplementation->setIvarInitializers(Context, 12435 AllToInit.data(), AllToInit.size()); 12436 } 12437} 12438 12439static 12440void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12441 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12442 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12443 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12444 Sema &S) { 12445 if (Ctor->isInvalidDecl()) 12446 return; 12447 12448 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12449 12450 // Target may not be determinable yet, for instance if this is a dependent 12451 // call in an uninstantiated template. 12452 if (Target) { 12453 const FunctionDecl *FNTarget = 0; 12454 (void)Target->hasBody(FNTarget); 12455 Target = const_cast<CXXConstructorDecl*>( 12456 cast_or_null<CXXConstructorDecl>(FNTarget)); 12457 } 12458 12459 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12460 // Avoid dereferencing a null pointer here. 12461 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12462 12463 if (!Current.insert(Canonical)) 12464 return; 12465 12466 // We know that beyond here, we aren't chaining into a cycle. 12467 if (!Target || !Target->isDelegatingConstructor() || 12468 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12469 Valid.insert(Current.begin(), Current.end()); 12470 Current.clear(); 12471 // We've hit a cycle. 12472 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12473 Current.count(TCanonical)) { 12474 // If we haven't diagnosed this cycle yet, do so now. 12475 if (!Invalid.count(TCanonical)) { 12476 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12477 diag::warn_delegating_ctor_cycle) 12478 << Ctor; 12479 12480 // Don't add a note for a function delegating directly to itself. 12481 if (TCanonical != Canonical) 12482 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12483 12484 CXXConstructorDecl *C = Target; 12485 while (C->getCanonicalDecl() != Canonical) { 12486 const FunctionDecl *FNTarget = 0; 12487 (void)C->getTargetConstructor()->hasBody(FNTarget); 12488 assert(FNTarget && "Ctor cycle through bodiless function"); 12489 12490 C = const_cast<CXXConstructorDecl*>( 12491 cast<CXXConstructorDecl>(FNTarget)); 12492 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12493 } 12494 } 12495 12496 Invalid.insert(Current.begin(), Current.end()); 12497 Current.clear(); 12498 } else { 12499 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12500 } 12501} 12502 12503 12504void Sema::CheckDelegatingCtorCycles() { 12505 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12506 12507 for (DelegatingCtorDeclsType::iterator 12508 I = DelegatingCtorDecls.begin(ExternalSource), 12509 E = DelegatingCtorDecls.end(); 12510 I != E; ++I) 12511 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12512 12513 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(), 12514 CE = Invalid.end(); 12515 CI != CE; ++CI) 12516 (*CI)->setInvalidDecl(); 12517} 12518 12519namespace { 12520 /// \brief AST visitor that finds references to the 'this' expression. 12521 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12522 Sema &S; 12523 12524 public: 12525 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12526 12527 bool VisitCXXThisExpr(CXXThisExpr *E) { 12528 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12529 << E->isImplicit(); 12530 return false; 12531 } 12532 }; 12533} 12534 12535bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12536 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12537 if (!TSInfo) 12538 return false; 12539 12540 TypeLoc TL = TSInfo->getTypeLoc(); 12541 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12542 if (!ProtoTL) 12543 return false; 12544 12545 // C++11 [expr.prim.general]p3: 12546 // [The expression this] shall not appear before the optional 12547 // cv-qualifier-seq and it shall not appear within the declaration of a 12548 // static member function (although its type and value category are defined 12549 // within a static member function as they are within a non-static member 12550 // function). [ Note: this is because declaration matching does not occur 12551 // until the complete declarator is known. - end note ] 12552 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12553 FindCXXThisExpr Finder(*this); 12554 12555 // If the return type came after the cv-qualifier-seq, check it now. 12556 if (Proto->hasTrailingReturn() && 12557 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12558 return true; 12559 12560 // Check the exception specification. 12561 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12562 return true; 12563 12564 return checkThisInStaticMemberFunctionAttributes(Method); 12565} 12566 12567bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12568 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12569 if (!TSInfo) 12570 return false; 12571 12572 TypeLoc TL = TSInfo->getTypeLoc(); 12573 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12574 if (!ProtoTL) 12575 return false; 12576 12577 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12578 FindCXXThisExpr Finder(*this); 12579 12580 switch (Proto->getExceptionSpecType()) { 12581 case EST_Uninstantiated: 12582 case EST_Unevaluated: 12583 case EST_BasicNoexcept: 12584 case EST_DynamicNone: 12585 case EST_MSAny: 12586 case EST_None: 12587 break; 12588 12589 case EST_ComputedNoexcept: 12590 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12591 return true; 12592 12593 case EST_Dynamic: 12594 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12595 EEnd = Proto->exception_end(); 12596 E != EEnd; ++E) { 12597 if (!Finder.TraverseType(*E)) 12598 return true; 12599 } 12600 break; 12601 } 12602 12603 return false; 12604} 12605 12606bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12607 FindCXXThisExpr Finder(*this); 12608 12609 // Check attributes. 12610 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12611 A != AEnd; ++A) { 12612 // FIXME: This should be emitted by tblgen. 12613 Expr *Arg = 0; 12614 ArrayRef<Expr *> Args; 12615 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12616 Arg = G->getArg(); 12617 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12618 Arg = G->getArg(); 12619 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12620 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12621 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12622 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12623 else if (ExclusiveLockFunctionAttr *ELF 12624 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12625 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12626 else if (SharedLockFunctionAttr *SLF 12627 = dyn_cast<SharedLockFunctionAttr>(*A)) 12628 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12629 else if (ExclusiveTrylockFunctionAttr *ETLF 12630 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12631 Arg = ETLF->getSuccessValue(); 12632 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12633 } else if (SharedTrylockFunctionAttr *STLF 12634 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12635 Arg = STLF->getSuccessValue(); 12636 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12637 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12638 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12639 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12640 Arg = LR->getArg(); 12641 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12642 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12643 else if (ExclusiveLocksRequiredAttr *ELR 12644 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12645 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12646 else if (SharedLocksRequiredAttr *SLR 12647 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12648 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12649 12650 if (Arg && !Finder.TraverseStmt(Arg)) 12651 return true; 12652 12653 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12654 if (!Finder.TraverseStmt(Args[I])) 12655 return true; 12656 } 12657 } 12658 12659 return false; 12660} 12661 12662void 12663Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12664 ArrayRef<ParsedType> DynamicExceptions, 12665 ArrayRef<SourceRange> DynamicExceptionRanges, 12666 Expr *NoexceptExpr, 12667 SmallVectorImpl<QualType> &Exceptions, 12668 FunctionProtoType::ExtProtoInfo &EPI) { 12669 Exceptions.clear(); 12670 EPI.ExceptionSpecType = EST; 12671 if (EST == EST_Dynamic) { 12672 Exceptions.reserve(DynamicExceptions.size()); 12673 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12674 // FIXME: Preserve type source info. 12675 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12676 12677 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12678 collectUnexpandedParameterPacks(ET, Unexpanded); 12679 if (!Unexpanded.empty()) { 12680 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12681 UPPC_ExceptionType, 12682 Unexpanded); 12683 continue; 12684 } 12685 12686 // Check that the type is valid for an exception spec, and 12687 // drop it if not. 12688 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12689 Exceptions.push_back(ET); 12690 } 12691 EPI.NumExceptions = Exceptions.size(); 12692 EPI.Exceptions = Exceptions.data(); 12693 return; 12694 } 12695 12696 if (EST == EST_ComputedNoexcept) { 12697 // If an error occurred, there's no expression here. 12698 if (NoexceptExpr) { 12699 assert((NoexceptExpr->isTypeDependent() || 12700 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12701 Context.BoolTy) && 12702 "Parser should have made sure that the expression is boolean"); 12703 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12704 EPI.ExceptionSpecType = EST_BasicNoexcept; 12705 return; 12706 } 12707 12708 if (!NoexceptExpr->isValueDependent()) 12709 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12710 diag::err_noexcept_needs_constant_expression, 12711 /*AllowFold*/ false).take(); 12712 EPI.NoexceptExpr = NoexceptExpr; 12713 } 12714 return; 12715 } 12716} 12717 12718/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12719Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12720 // Implicitly declared functions (e.g. copy constructors) are 12721 // __host__ __device__ 12722 if (D->isImplicit()) 12723 return CFT_HostDevice; 12724 12725 if (D->hasAttr<CUDAGlobalAttr>()) 12726 return CFT_Global; 12727 12728 if (D->hasAttr<CUDADeviceAttr>()) { 12729 if (D->hasAttr<CUDAHostAttr>()) 12730 return CFT_HostDevice; 12731 return CFT_Device; 12732 } 12733 12734 return CFT_Host; 12735} 12736 12737bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12738 CUDAFunctionTarget CalleeTarget) { 12739 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12740 // Callable from the device only." 12741 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12742 return true; 12743 12744 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12745 // Callable from the host only." 12746 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12747 // Callable from the host only." 12748 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12749 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12750 return true; 12751 12752 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12753 return true; 12754 12755 return false; 12756} 12757 12758/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12759/// 12760MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12761 SourceLocation DeclStart, 12762 Declarator &D, Expr *BitWidth, 12763 InClassInitStyle InitStyle, 12764 AccessSpecifier AS, 12765 AttributeList *MSPropertyAttr) { 12766 IdentifierInfo *II = D.getIdentifier(); 12767 if (!II) { 12768 Diag(DeclStart, diag::err_anonymous_property); 12769 return NULL; 12770 } 12771 SourceLocation Loc = D.getIdentifierLoc(); 12772 12773 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12774 QualType T = TInfo->getType(); 12775 if (getLangOpts().CPlusPlus) { 12776 CheckExtraCXXDefaultArguments(D); 12777 12778 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12779 UPPC_DataMemberType)) { 12780 D.setInvalidType(); 12781 T = Context.IntTy; 12782 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12783 } 12784 } 12785 12786 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12787 12788 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12789 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12790 diag::err_invalid_thread) 12791 << DeclSpec::getSpecifierName(TSCS); 12792 12793 // Check to see if this name was declared as a member previously 12794 NamedDecl *PrevDecl = 0; 12795 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12796 LookupName(Previous, S); 12797 switch (Previous.getResultKind()) { 12798 case LookupResult::Found: 12799 case LookupResult::FoundUnresolvedValue: 12800 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12801 break; 12802 12803 case LookupResult::FoundOverloaded: 12804 PrevDecl = Previous.getRepresentativeDecl(); 12805 break; 12806 12807 case LookupResult::NotFound: 12808 case LookupResult::NotFoundInCurrentInstantiation: 12809 case LookupResult::Ambiguous: 12810 break; 12811 } 12812 12813 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12814 // Maybe we will complain about the shadowed template parameter. 12815 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12816 // Just pretend that we didn't see the previous declaration. 12817 PrevDecl = 0; 12818 } 12819 12820 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12821 PrevDecl = 0; 12822 12823 SourceLocation TSSL = D.getLocStart(); 12824 MSPropertyDecl *NewPD; 12825 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12826 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12827 II, T, TInfo, TSSL, 12828 Data.GetterId, Data.SetterId); 12829 ProcessDeclAttributes(TUScope, NewPD, D); 12830 NewPD->setAccess(AS); 12831 12832 if (NewPD->isInvalidDecl()) 12833 Record->setInvalidDecl(); 12834 12835 if (D.getDeclSpec().isModulePrivateSpecified()) 12836 NewPD->setModulePrivate(); 12837 12838 if (NewPD->isInvalidDecl() && PrevDecl) { 12839 // Don't introduce NewFD into scope; there's already something 12840 // with the same name in the same scope. 12841 } else if (II) { 12842 PushOnScopeChains(NewPD, S); 12843 } else 12844 Record->addDecl(NewPD); 12845 12846 return NewPD; 12847} 12848