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 45 using namespace clang; 46 47 //===----------------------------------------------------------------------===// 48 // CheckDefaultArgumentVisitor 49 //===----------------------------------------------------------------------===// 50 51 namespace { 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 } 149 150 void 151 Sema::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 } 221 222 void 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 } 250 251 bool 252 Sema::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. 300 void 301 Sema::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. 337 void 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. 350 void 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. 364 void 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 } 404 405 static 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. 420 bool 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. 621 void 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]. 661 void 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. 713 static 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. 736 static 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. 751 bool 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. 811 static 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() && !VD->isCXXForRangeDecl()) { 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. 924 static 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. 958 static bool 959 CheckConstexprFunctionStmt(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. 1078 bool 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. 1214 bool 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 identifier II is a typo for the name of 1231 /// the class type currently being defined. If so, update it to the identifier 1232 /// that should have been used. 1233 bool Sema::isCurrentClassNameTypo(IdentifierInfo *&II, const CXXScopeSpec *SS) { 1234 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1235 1236 if (!getLangOpts().SpellChecking) 1237 return false; 1238 1239 CXXRecordDecl *CurDecl; 1240 if (SS && SS->isSet() && !SS->isInvalid()) { 1241 DeclContext *DC = computeDeclContext(*SS, true); 1242 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1243 } else 1244 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1245 1246 if (CurDecl && CurDecl->getIdentifier() && II != CurDecl->getIdentifier() && 1247 3 * II->getName().edit_distance(CurDecl->getIdentifier()->getName()) 1248 < II->getLength()) { 1249 II = CurDecl->getIdentifier(); 1250 return true; 1251 } 1252 1253 return false; 1254 } 1255 1256 /// \brief Determine whether the given class is a base class of the given 1257 /// class, including looking at dependent bases. 1258 static bool findCircularInheritance(const CXXRecordDecl *Class, 1259 const CXXRecordDecl *Current) { 1260 SmallVector<const CXXRecordDecl*, 8> Queue; 1261 1262 Class = Class->getCanonicalDecl(); 1263 while (true) { 1264 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1265 E = Current->bases_end(); 1266 I != E; ++I) { 1267 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1268 if (!Base) 1269 continue; 1270 1271 Base = Base->getDefinition(); 1272 if (!Base) 1273 continue; 1274 1275 if (Base->getCanonicalDecl() == Class) 1276 return true; 1277 1278 Queue.push_back(Base); 1279 } 1280 1281 if (Queue.empty()) 1282 return false; 1283 1284 Current = Queue.pop_back_val(); 1285 } 1286 1287 return false; 1288 } 1289 1290 /// \brief Check the validity of a C++ base class specifier. 1291 /// 1292 /// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1293 /// and returns NULL otherwise. 1294 CXXBaseSpecifier * 1295 Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1296 SourceRange SpecifierRange, 1297 bool Virtual, AccessSpecifier Access, 1298 TypeSourceInfo *TInfo, 1299 SourceLocation EllipsisLoc) { 1300 QualType BaseType = TInfo->getType(); 1301 1302 // C++ [class.union]p1: 1303 // A union shall not have base classes. 1304 if (Class->isUnion()) { 1305 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1306 << SpecifierRange; 1307 return 0; 1308 } 1309 1310 if (EllipsisLoc.isValid() && 1311 !TInfo->getType()->containsUnexpandedParameterPack()) { 1312 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1313 << TInfo->getTypeLoc().getSourceRange(); 1314 EllipsisLoc = SourceLocation(); 1315 } 1316 1317 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1318 1319 if (BaseType->isDependentType()) { 1320 // Make sure that we don't have circular inheritance among our dependent 1321 // bases. For non-dependent bases, the check for completeness below handles 1322 // this. 1323 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1324 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1325 ((BaseDecl = BaseDecl->getDefinition()) && 1326 findCircularInheritance(Class, BaseDecl))) { 1327 Diag(BaseLoc, diag::err_circular_inheritance) 1328 << BaseType << Context.getTypeDeclType(Class); 1329 1330 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1331 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1332 << BaseType; 1333 1334 return 0; 1335 } 1336 } 1337 1338 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1339 Class->getTagKind() == TTK_Class, 1340 Access, TInfo, EllipsisLoc); 1341 } 1342 1343 // Base specifiers must be record types. 1344 if (!BaseType->isRecordType()) { 1345 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1346 return 0; 1347 } 1348 1349 // C++ [class.union]p1: 1350 // A union shall not be used as a base class. 1351 if (BaseType->isUnionType()) { 1352 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1353 return 0; 1354 } 1355 1356 // C++ [class.derived]p2: 1357 // The class-name in a base-specifier shall not be an incompletely 1358 // defined class. 1359 if (RequireCompleteType(BaseLoc, BaseType, 1360 diag::err_incomplete_base_class, SpecifierRange)) { 1361 Class->setInvalidDecl(); 1362 return 0; 1363 } 1364 1365 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1366 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1367 assert(BaseDecl && "Record type has no declaration"); 1368 BaseDecl = BaseDecl->getDefinition(); 1369 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1370 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1371 assert(CXXBaseDecl && "Base type is not a C++ type"); 1372 1373 // A class which contains a flexible array member is not suitable for use as a 1374 // base class: 1375 // - If the layout determines that a base comes before another base, 1376 // the flexible array member would index into the subsequent base. 1377 // - If the layout determines that base comes before the derived class, 1378 // the flexible array member would index into the derived class. 1379 if (CXXBaseDecl->hasFlexibleArrayMember()) { 1380 Diag(BaseLoc, diag::err_base_class_has_flexible_array_member) 1381 << CXXBaseDecl->getDeclName(); 1382 return 0; 1383 } 1384 1385 // C++ [class]p3: 1386 // If a class is marked final and it appears as a base-type-specifier in 1387 // base-clause, the program is ill-formed. 1388 if (FinalAttr *FA = CXXBaseDecl->getAttr<FinalAttr>()) { 1389 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1390 << CXXBaseDecl->getDeclName() 1391 << FA->isSpelledAsSealed(); 1392 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1393 << CXXBaseDecl->getDeclName(); 1394 return 0; 1395 } 1396 1397 if (BaseDecl->isInvalidDecl()) 1398 Class->setInvalidDecl(); 1399 1400 // Create the base specifier. 1401 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1402 Class->getTagKind() == TTK_Class, 1403 Access, TInfo, EllipsisLoc); 1404 } 1405 1406 /// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1407 /// one entry in the base class list of a class specifier, for 1408 /// example: 1409 /// class foo : public bar, virtual private baz { 1410 /// 'public bar' and 'virtual private baz' are each base-specifiers. 1411 BaseResult 1412 Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1413 ParsedAttributes &Attributes, 1414 bool Virtual, AccessSpecifier Access, 1415 ParsedType basetype, SourceLocation BaseLoc, 1416 SourceLocation EllipsisLoc) { 1417 if (!classdecl) 1418 return true; 1419 1420 AdjustDeclIfTemplate(classdecl); 1421 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1422 if (!Class) 1423 return true; 1424 1425 // We do not support any C++11 attributes on base-specifiers yet. 1426 // Diagnose any attributes we see. 1427 if (!Attributes.empty()) { 1428 for (AttributeList *Attr = Attributes.getList(); Attr; 1429 Attr = Attr->getNext()) { 1430 if (Attr->isInvalid() || 1431 Attr->getKind() == AttributeList::IgnoredAttribute) 1432 continue; 1433 Diag(Attr->getLoc(), 1434 Attr->getKind() == AttributeList::UnknownAttribute 1435 ? diag::warn_unknown_attribute_ignored 1436 : diag::err_base_specifier_attribute) 1437 << Attr->getName(); 1438 } 1439 } 1440 1441 TypeSourceInfo *TInfo = 0; 1442 GetTypeFromParser(basetype, &TInfo); 1443 1444 if (EllipsisLoc.isInvalid() && 1445 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1446 UPPC_BaseType)) 1447 return true; 1448 1449 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1450 Virtual, Access, TInfo, 1451 EllipsisLoc)) 1452 return BaseSpec; 1453 else 1454 Class->setInvalidDecl(); 1455 1456 return true; 1457 } 1458 1459 /// \brief Performs the actual work of attaching the given base class 1460 /// specifiers to a C++ class. 1461 bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1462 unsigned NumBases) { 1463 if (NumBases == 0) 1464 return false; 1465 1466 // Used to keep track of which base types we have already seen, so 1467 // that we can properly diagnose redundant direct base types. Note 1468 // that the key is always the unqualified canonical type of the base 1469 // class. 1470 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1471 1472 // Copy non-redundant base specifiers into permanent storage. 1473 unsigned NumGoodBases = 0; 1474 bool Invalid = false; 1475 for (unsigned idx = 0; idx < NumBases; ++idx) { 1476 QualType NewBaseType 1477 = Context.getCanonicalType(Bases[idx]->getType()); 1478 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1479 1480 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1481 if (KnownBase) { 1482 // C++ [class.mi]p3: 1483 // A class shall not be specified as a direct base class of a 1484 // derived class more than once. 1485 Diag(Bases[idx]->getLocStart(), 1486 diag::err_duplicate_base_class) 1487 << KnownBase->getType() 1488 << Bases[idx]->getSourceRange(); 1489 1490 // Delete the duplicate base class specifier; we're going to 1491 // overwrite its pointer later. 1492 Context.Deallocate(Bases[idx]); 1493 1494 Invalid = true; 1495 } else { 1496 // Okay, add this new base class. 1497 KnownBase = Bases[idx]; 1498 Bases[NumGoodBases++] = Bases[idx]; 1499 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1500 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1501 if (Class->isInterface() && 1502 (!RD->isInterface() || 1503 KnownBase->getAccessSpecifier() != AS_public)) { 1504 // The Microsoft extension __interface does not permit bases that 1505 // are not themselves public interfaces. 1506 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1507 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1508 << RD->getSourceRange(); 1509 Invalid = true; 1510 } 1511 if (RD->hasAttr<WeakAttr>()) 1512 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1513 } 1514 } 1515 } 1516 1517 // Attach the remaining base class specifiers to the derived class. 1518 Class->setBases(Bases, NumGoodBases); 1519 1520 // Delete the remaining (good) base class specifiers, since their 1521 // data has been copied into the CXXRecordDecl. 1522 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1523 Context.Deallocate(Bases[idx]); 1524 1525 return Invalid; 1526 } 1527 1528 /// ActOnBaseSpecifiers - Attach the given base specifiers to the 1529 /// class, after checking whether there are any duplicate base 1530 /// classes. 1531 void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1532 unsigned NumBases) { 1533 if (!ClassDecl || !Bases || !NumBases) 1534 return; 1535 1536 AdjustDeclIfTemplate(ClassDecl); 1537 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), Bases, NumBases); 1538 } 1539 1540 /// \brief Determine whether the type \p Derived is a C++ class that is 1541 /// derived from the type \p Base. 1542 bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1543 if (!getLangOpts().CPlusPlus) 1544 return false; 1545 1546 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1547 if (!DerivedRD) 1548 return false; 1549 1550 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1551 if (!BaseRD) 1552 return false; 1553 1554 // If either the base or the derived type is invalid, don't try to 1555 // check whether one is derived from the other. 1556 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1557 return false; 1558 1559 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1560 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1561 } 1562 1563 /// \brief Determine whether the type \p Derived is a C++ class that is 1564 /// derived from the type \p Base. 1565 bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1566 if (!getLangOpts().CPlusPlus) 1567 return false; 1568 1569 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1570 if (!DerivedRD) 1571 return false; 1572 1573 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1574 if (!BaseRD) 1575 return false; 1576 1577 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1578 } 1579 1580 void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1581 CXXCastPath &BasePathArray) { 1582 assert(BasePathArray.empty() && "Base path array must be empty!"); 1583 assert(Paths.isRecordingPaths() && "Must record paths!"); 1584 1585 const CXXBasePath &Path = Paths.front(); 1586 1587 // We first go backward and check if we have a virtual base. 1588 // FIXME: It would be better if CXXBasePath had the base specifier for 1589 // the nearest virtual base. 1590 unsigned Start = 0; 1591 for (unsigned I = Path.size(); I != 0; --I) { 1592 if (Path[I - 1].Base->isVirtual()) { 1593 Start = I - 1; 1594 break; 1595 } 1596 } 1597 1598 // Now add all bases. 1599 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1600 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1601 } 1602 1603 /// \brief Determine whether the given base path includes a virtual 1604 /// base class. 1605 bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1606 for (CXXCastPath::const_iterator B = BasePath.begin(), 1607 BEnd = BasePath.end(); 1608 B != BEnd; ++B) 1609 if ((*B)->isVirtual()) 1610 return true; 1611 1612 return false; 1613 } 1614 1615 /// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1616 /// conversion (where Derived and Base are class types) is 1617 /// well-formed, meaning that the conversion is unambiguous (and 1618 /// that all of the base classes are accessible). Returns true 1619 /// and emits a diagnostic if the code is ill-formed, returns false 1620 /// otherwise. Loc is the location where this routine should point to 1621 /// if there is an error, and Range is the source range to highlight 1622 /// if there is an error. 1623 bool 1624 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1625 unsigned InaccessibleBaseID, 1626 unsigned AmbigiousBaseConvID, 1627 SourceLocation Loc, SourceRange Range, 1628 DeclarationName Name, 1629 CXXCastPath *BasePath) { 1630 // First, determine whether the path from Derived to Base is 1631 // ambiguous. This is slightly more expensive than checking whether 1632 // the Derived to Base conversion exists, because here we need to 1633 // explore multiple paths to determine if there is an ambiguity. 1634 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1635 /*DetectVirtual=*/false); 1636 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1637 assert(DerivationOkay && 1638 "Can only be used with a derived-to-base conversion"); 1639 (void)DerivationOkay; 1640 1641 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1642 if (InaccessibleBaseID) { 1643 // Check that the base class can be accessed. 1644 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1645 InaccessibleBaseID)) { 1646 case AR_inaccessible: 1647 return true; 1648 case AR_accessible: 1649 case AR_dependent: 1650 case AR_delayed: 1651 break; 1652 } 1653 } 1654 1655 // Build a base path if necessary. 1656 if (BasePath) 1657 BuildBasePathArray(Paths, *BasePath); 1658 return false; 1659 } 1660 1661 if (AmbigiousBaseConvID) { 1662 // We know that the derived-to-base conversion is ambiguous, and 1663 // we're going to produce a diagnostic. Perform the derived-to-base 1664 // search just one more time to compute all of the possible paths so 1665 // that we can print them out. This is more expensive than any of 1666 // the previous derived-to-base checks we've done, but at this point 1667 // performance isn't as much of an issue. 1668 Paths.clear(); 1669 Paths.setRecordingPaths(true); 1670 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1671 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1672 (void)StillOkay; 1673 1674 // Build up a textual representation of the ambiguous paths, e.g., 1675 // D -> B -> A, that will be used to illustrate the ambiguous 1676 // conversions in the diagnostic. We only print one of the paths 1677 // to each base class subobject. 1678 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1679 1680 Diag(Loc, AmbigiousBaseConvID) 1681 << Derived << Base << PathDisplayStr << Range << Name; 1682 } 1683 return true; 1684 } 1685 1686 bool 1687 Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1688 SourceLocation Loc, SourceRange Range, 1689 CXXCastPath *BasePath, 1690 bool IgnoreAccess) { 1691 return CheckDerivedToBaseConversion(Derived, Base, 1692 IgnoreAccess ? 0 1693 : diag::err_upcast_to_inaccessible_base, 1694 diag::err_ambiguous_derived_to_base_conv, 1695 Loc, Range, DeclarationName(), 1696 BasePath); 1697 } 1698 1699 1700 /// @brief Builds a string representing ambiguous paths from a 1701 /// specific derived class to different subobjects of the same base 1702 /// class. 1703 /// 1704 /// This function builds a string that can be used in error messages 1705 /// to show the different paths that one can take through the 1706 /// inheritance hierarchy to go from the derived class to different 1707 /// subobjects of a base class. The result looks something like this: 1708 /// @code 1709 /// struct D -> struct B -> struct A 1710 /// struct D -> struct C -> struct A 1711 /// @endcode 1712 std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1713 std::string PathDisplayStr; 1714 std::set<unsigned> DisplayedPaths; 1715 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1716 Path != Paths.end(); ++Path) { 1717 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1718 // We haven't displayed a path to this particular base 1719 // class subobject yet. 1720 PathDisplayStr += "\n "; 1721 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1722 for (CXXBasePath::const_iterator Element = Path->begin(); 1723 Element != Path->end(); ++Element) 1724 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1725 } 1726 } 1727 1728 return PathDisplayStr; 1729 } 1730 1731 //===----------------------------------------------------------------------===// 1732 // C++ class member Handling 1733 //===----------------------------------------------------------------------===// 1734 1735 /// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1736 bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1737 SourceLocation ASLoc, 1738 SourceLocation ColonLoc, 1739 AttributeList *Attrs) { 1740 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1741 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1742 ASLoc, ColonLoc); 1743 CurContext->addHiddenDecl(ASDecl); 1744 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1745 } 1746 1747 /// CheckOverrideControl - Check C++11 override control semantics. 1748 void Sema::CheckOverrideControl(NamedDecl *D) { 1749 if (D->isInvalidDecl()) 1750 return; 1751 1752 // We only care about "override" and "final" declarations. 1753 if (!D->hasAttr<OverrideAttr>() && !D->hasAttr<FinalAttr>()) 1754 return; 1755 1756 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1757 1758 // We can't check dependent instance methods. 1759 if (MD && MD->isInstance() && 1760 (MD->getParent()->hasAnyDependentBases() || 1761 MD->getType()->isDependentType())) 1762 return; 1763 1764 if (MD && !MD->isVirtual()) { 1765 // If we have a non-virtual method, check if if hides a virtual method. 1766 // (In that case, it's most likely the method has the wrong type.) 1767 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 1768 FindHiddenVirtualMethods(MD, OverloadedMethods); 1769 1770 if (!OverloadedMethods.empty()) { 1771 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1772 Diag(OA->getLocation(), 1773 diag::override_keyword_hides_virtual_member_function) 1774 << "override" << (OverloadedMethods.size() > 1); 1775 } else if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1776 Diag(FA->getLocation(), 1777 diag::override_keyword_hides_virtual_member_function) 1778 << (FA->isSpelledAsSealed() ? "sealed" : "final") 1779 << (OverloadedMethods.size() > 1); 1780 } 1781 NoteHiddenVirtualMethods(MD, OverloadedMethods); 1782 MD->setInvalidDecl(); 1783 return; 1784 } 1785 // Fall through into the general case diagnostic. 1786 // FIXME: We might want to attempt typo correction here. 1787 } 1788 1789 if (!MD || !MD->isVirtual()) { 1790 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1791 Diag(OA->getLocation(), 1792 diag::override_keyword_only_allowed_on_virtual_member_functions) 1793 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1794 D->dropAttr<OverrideAttr>(); 1795 } 1796 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1797 Diag(FA->getLocation(), 1798 diag::override_keyword_only_allowed_on_virtual_member_functions) 1799 << (FA->isSpelledAsSealed() ? "sealed" : "final") 1800 << FixItHint::CreateRemoval(FA->getLocation()); 1801 D->dropAttr<FinalAttr>(); 1802 } 1803 return; 1804 } 1805 1806 // C++11 [class.virtual]p5: 1807 // If a virtual function is marked with the virt-specifier override and 1808 // does not override a member function of a base class, the program is 1809 // ill-formed. 1810 bool HasOverriddenMethods = 1811 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1812 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1813 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1814 << MD->getDeclName(); 1815 } 1816 1817 /// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1818 /// function overrides a virtual member function marked 'final', according to 1819 /// C++11 [class.virtual]p4. 1820 bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1821 const CXXMethodDecl *Old) { 1822 FinalAttr *FA = Old->getAttr<FinalAttr>(); 1823 if (!FA) 1824 return false; 1825 1826 Diag(New->getLocation(), diag::err_final_function_overridden) 1827 << New->getDeclName() 1828 << FA->isSpelledAsSealed(); 1829 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1830 return true; 1831 } 1832 1833 static bool InitializationHasSideEffects(const FieldDecl &FD) { 1834 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1835 // FIXME: Destruction of ObjC lifetime types has side-effects. 1836 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1837 return !RD->isCompleteDefinition() || 1838 !RD->hasTrivialDefaultConstructor() || 1839 !RD->hasTrivialDestructor(); 1840 return false; 1841 } 1842 1843 static AttributeList *getMSPropertyAttr(AttributeList *list) { 1844 for (AttributeList* it = list; it != 0; it = it->getNext()) 1845 if (it->isDeclspecPropertyAttribute()) 1846 return it; 1847 return 0; 1848 } 1849 1850 /// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1851 /// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1852 /// bitfield width if there is one, 'InitExpr' specifies the initializer if 1853 /// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1854 /// present (but parsing it has been deferred). 1855 NamedDecl * 1856 Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1857 MultiTemplateParamsArg TemplateParameterLists, 1858 Expr *BW, const VirtSpecifiers &VS, 1859 InClassInitStyle InitStyle) { 1860 const DeclSpec &DS = D.getDeclSpec(); 1861 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1862 DeclarationName Name = NameInfo.getName(); 1863 SourceLocation Loc = NameInfo.getLoc(); 1864 1865 // For anonymous bitfields, the location should point to the type. 1866 if (Loc.isInvalid()) 1867 Loc = D.getLocStart(); 1868 1869 Expr *BitWidth = static_cast<Expr*>(BW); 1870 1871 assert(isa<CXXRecordDecl>(CurContext)); 1872 assert(!DS.isFriendSpecified()); 1873 1874 bool isFunc = D.isDeclarationOfFunction(); 1875 1876 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1877 // The Microsoft extension __interface only permits public member functions 1878 // and prohibits constructors, destructors, operators, non-public member 1879 // functions, static methods and data members. 1880 unsigned InvalidDecl; 1881 bool ShowDeclName = true; 1882 if (!isFunc) 1883 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1884 else if (AS != AS_public) 1885 InvalidDecl = 2; 1886 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1887 InvalidDecl = 3; 1888 else switch (Name.getNameKind()) { 1889 case DeclarationName::CXXConstructorName: 1890 InvalidDecl = 4; 1891 ShowDeclName = false; 1892 break; 1893 1894 case DeclarationName::CXXDestructorName: 1895 InvalidDecl = 5; 1896 ShowDeclName = false; 1897 break; 1898 1899 case DeclarationName::CXXOperatorName: 1900 case DeclarationName::CXXConversionFunctionName: 1901 InvalidDecl = 6; 1902 break; 1903 1904 default: 1905 InvalidDecl = 0; 1906 break; 1907 } 1908 1909 if (InvalidDecl) { 1910 if (ShowDeclName) 1911 Diag(Loc, diag::err_invalid_member_in_interface) 1912 << (InvalidDecl-1) << Name; 1913 else 1914 Diag(Loc, diag::err_invalid_member_in_interface) 1915 << (InvalidDecl-1) << ""; 1916 return 0; 1917 } 1918 } 1919 1920 // C++ 9.2p6: A member shall not be declared to have automatic storage 1921 // duration (auto, register) or with the extern storage-class-specifier. 1922 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1923 // data members and cannot be applied to names declared const or static, 1924 // and cannot be applied to reference members. 1925 switch (DS.getStorageClassSpec()) { 1926 case DeclSpec::SCS_unspecified: 1927 case DeclSpec::SCS_typedef: 1928 case DeclSpec::SCS_static: 1929 break; 1930 case DeclSpec::SCS_mutable: 1931 if (isFunc) { 1932 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1933 1934 // FIXME: It would be nicer if the keyword was ignored only for this 1935 // declarator. Otherwise we could get follow-up errors. 1936 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1937 } 1938 break; 1939 default: 1940 Diag(DS.getStorageClassSpecLoc(), 1941 diag::err_storageclass_invalid_for_member); 1942 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1943 break; 1944 } 1945 1946 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1947 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1948 !isFunc); 1949 1950 if (DS.isConstexprSpecified() && isInstField) { 1951 SemaDiagnosticBuilder B = 1952 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1953 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1954 if (InitStyle == ICIS_NoInit) { 1955 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1956 D.getMutableDeclSpec().ClearConstexprSpec(); 1957 const char *PrevSpec; 1958 unsigned DiagID; 1959 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1960 PrevSpec, DiagID, getLangOpts()); 1961 (void)Failed; 1962 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1963 } else { 1964 B << 1; 1965 const char *PrevSpec; 1966 unsigned DiagID; 1967 if (D.getMutableDeclSpec().SetStorageClassSpec( 1968 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1969 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1970 "This is the only DeclSpec that should fail to be applied"); 1971 B << 1; 1972 } else { 1973 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1974 isInstField = false; 1975 } 1976 } 1977 } 1978 1979 NamedDecl *Member; 1980 if (isInstField) { 1981 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1982 1983 // Data members must have identifiers for names. 1984 if (!Name.isIdentifier()) { 1985 Diag(Loc, diag::err_bad_variable_name) 1986 << Name; 1987 return 0; 1988 } 1989 1990 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1991 1992 // Member field could not be with "template" keyword. 1993 // So TemplateParameterLists should be empty in this case. 1994 if (TemplateParameterLists.size()) { 1995 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1996 if (TemplateParams->size()) { 1997 // There is no such thing as a member field template. 1998 Diag(D.getIdentifierLoc(), diag::err_template_member) 1999 << II 2000 << SourceRange(TemplateParams->getTemplateLoc(), 2001 TemplateParams->getRAngleLoc()); 2002 } else { 2003 // There is an extraneous 'template<>' for this member. 2004 Diag(TemplateParams->getTemplateLoc(), 2005 diag::err_template_member_noparams) 2006 << II 2007 << SourceRange(TemplateParams->getTemplateLoc(), 2008 TemplateParams->getRAngleLoc()); 2009 } 2010 return 0; 2011 } 2012 2013 if (SS.isSet() && !SS.isInvalid()) { 2014 // The user provided a superfluous scope specifier inside a class 2015 // definition: 2016 // 2017 // class X { 2018 // int X::member; 2019 // }; 2020 if (DeclContext *DC = computeDeclContext(SS, false)) 2021 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 2022 else 2023 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 2024 << Name << SS.getRange(); 2025 2026 SS.clear(); 2027 } 2028 2029 AttributeList *MSPropertyAttr = 2030 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 2031 if (MSPropertyAttr) { 2032 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 2033 BitWidth, InitStyle, AS, MSPropertyAttr); 2034 if (!Member) 2035 return 0; 2036 isInstField = false; 2037 } else { 2038 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 2039 BitWidth, InitStyle, AS); 2040 assert(Member && "HandleField never returns null"); 2041 } 2042 } else { 2043 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 2044 2045 Member = HandleDeclarator(S, D, TemplateParameterLists); 2046 if (!Member) 2047 return 0; 2048 2049 // Non-instance-fields can't have a bitfield. 2050 if (BitWidth) { 2051 if (Member->isInvalidDecl()) { 2052 // don't emit another diagnostic. 2053 } else if (isa<VarDecl>(Member)) { 2054 // C++ 9.6p3: A bit-field shall not be a static member. 2055 // "static member 'A' cannot be a bit-field" 2056 Diag(Loc, diag::err_static_not_bitfield) 2057 << Name << BitWidth->getSourceRange(); 2058 } else if (isa<TypedefDecl>(Member)) { 2059 // "typedef member 'x' cannot be a bit-field" 2060 Diag(Loc, diag::err_typedef_not_bitfield) 2061 << Name << BitWidth->getSourceRange(); 2062 } else { 2063 // A function typedef ("typedef int f(); f a;"). 2064 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 2065 Diag(Loc, diag::err_not_integral_type_bitfield) 2066 << Name << cast<ValueDecl>(Member)->getType() 2067 << BitWidth->getSourceRange(); 2068 } 2069 2070 BitWidth = 0; 2071 Member->setInvalidDecl(); 2072 } 2073 2074 Member->setAccess(AS); 2075 2076 // If we have declared a member function template or static data member 2077 // template, set the access of the templated declaration as well. 2078 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 2079 FunTmpl->getTemplatedDecl()->setAccess(AS); 2080 else if (VarTemplateDecl *VarTmpl = dyn_cast<VarTemplateDecl>(Member)) 2081 VarTmpl->getTemplatedDecl()->setAccess(AS); 2082 } 2083 2084 if (VS.isOverrideSpecified()) 2085 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 2086 if (VS.isFinalSpecified()) 2087 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context, 2088 VS.isFinalSpelledSealed())); 2089 2090 if (VS.getLastLocation().isValid()) { 2091 // Update the end location of a method that has a virt-specifiers. 2092 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 2093 MD->setRangeEnd(VS.getLastLocation()); 2094 } 2095 2096 CheckOverrideControl(Member); 2097 2098 assert((Name || isInstField) && "No identifier for non-field ?"); 2099 2100 if (isInstField) { 2101 FieldDecl *FD = cast<FieldDecl>(Member); 2102 FieldCollector->Add(FD); 2103 2104 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2105 FD->getLocation()) 2106 != DiagnosticsEngine::Ignored) { 2107 // Remember all explicit private FieldDecls that have a name, no side 2108 // effects and are not part of a dependent type declaration. 2109 if (!FD->isImplicit() && FD->getDeclName() && 2110 FD->getAccess() == AS_private && 2111 !FD->hasAttr<UnusedAttr>() && 2112 !FD->getParent()->isDependentContext() && 2113 !InitializationHasSideEffects(*FD)) 2114 UnusedPrivateFields.insert(FD); 2115 } 2116 } 2117 2118 return Member; 2119 } 2120 2121 namespace { 2122 class UninitializedFieldVisitor 2123 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2124 Sema &S; 2125 // List of Decls to generate a warning on. Also remove Decls that become 2126 // initialized. 2127 llvm::SmallPtrSet<ValueDecl*, 4> &Decls; 2128 // If non-null, add a note to the warning pointing back to the constructor. 2129 const CXXConstructorDecl *Constructor; 2130 public: 2131 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2132 UninitializedFieldVisitor(Sema &S, 2133 llvm::SmallPtrSet<ValueDecl*, 4> &Decls, 2134 const CXXConstructorDecl *Constructor) 2135 : Inherited(S.Context), S(S), Decls(Decls), 2136 Constructor(Constructor) { } 2137 2138 void HandleMemberExpr(MemberExpr *ME, bool CheckReferenceOnly) { 2139 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2140 return; 2141 2142 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2143 // or union. 2144 MemberExpr *FieldME = ME; 2145 2146 Expr *Base = ME; 2147 while (isa<MemberExpr>(Base)) { 2148 ME = cast<MemberExpr>(Base); 2149 2150 if (isa<VarDecl>(ME->getMemberDecl())) 2151 return; 2152 2153 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2154 if (!FD->isAnonymousStructOrUnion()) 2155 FieldME = ME; 2156 2157 Base = ME->getBase(); 2158 } 2159 2160 if (!isa<CXXThisExpr>(Base)) 2161 return; 2162 2163 ValueDecl* FoundVD = FieldME->getMemberDecl(); 2164 2165 if (!Decls.count(FoundVD)) 2166 return; 2167 2168 const bool IsReference = FoundVD->getType()->isReferenceType(); 2169 2170 // Prevent double warnings on use of unbounded references. 2171 if (IsReference != CheckReferenceOnly) 2172 return; 2173 2174 unsigned diag = IsReference 2175 ? diag::warn_reference_field_is_uninit 2176 : diag::warn_field_is_uninit; 2177 S.Diag(FieldME->getExprLoc(), diag) << FoundVD; 2178 if (Constructor) 2179 S.Diag(Constructor->getLocation(), 2180 diag::note_uninit_in_this_constructor) 2181 << (Constructor->isDefaultConstructor() && Constructor->isImplicit()); 2182 2183 } 2184 2185 void HandleValue(Expr *E) { 2186 E = E->IgnoreParens(); 2187 2188 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2189 HandleMemberExpr(ME, false /*CheckReferenceOnly*/); 2190 return; 2191 } 2192 2193 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2194 HandleValue(CO->getTrueExpr()); 2195 HandleValue(CO->getFalseExpr()); 2196 return; 2197 } 2198 2199 if (BinaryConditionalOperator *BCO = 2200 dyn_cast<BinaryConditionalOperator>(E)) { 2201 HandleValue(BCO->getCommon()); 2202 HandleValue(BCO->getFalseExpr()); 2203 return; 2204 } 2205 2206 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2207 switch (BO->getOpcode()) { 2208 default: 2209 return; 2210 case(BO_PtrMemD): 2211 case(BO_PtrMemI): 2212 HandleValue(BO->getLHS()); 2213 return; 2214 case(BO_Comma): 2215 HandleValue(BO->getRHS()); 2216 return; 2217 } 2218 } 2219 } 2220 2221 void VisitMemberExpr(MemberExpr *ME) { 2222 // All uses of unbounded reference fields will warn. 2223 HandleMemberExpr(ME, true /*CheckReferenceOnly*/); 2224 2225 Inherited::VisitMemberExpr(ME); 2226 } 2227 2228 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2229 if (E->getCastKind() == CK_LValueToRValue) 2230 HandleValue(E->getSubExpr()); 2231 2232 Inherited::VisitImplicitCastExpr(E); 2233 } 2234 2235 void VisitCXXConstructExpr(CXXConstructExpr *E) { 2236 if (E->getConstructor()->isCopyConstructor()) 2237 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(E->getArg(0))) 2238 if (ICE->getCastKind() == CK_NoOp) 2239 if (MemberExpr *ME = dyn_cast<MemberExpr>(ICE->getSubExpr())) 2240 HandleMemberExpr(ME, false /*CheckReferenceOnly*/); 2241 2242 Inherited::VisitCXXConstructExpr(E); 2243 } 2244 2245 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2246 Expr *Callee = E->getCallee(); 2247 if (isa<MemberExpr>(Callee)) 2248 HandleValue(Callee); 2249 2250 Inherited::VisitCXXMemberCallExpr(E); 2251 } 2252 2253 void VisitBinaryOperator(BinaryOperator *E) { 2254 // If a field assignment is detected, remove the field from the 2255 // uninitiailized field set. 2256 if (E->getOpcode() == BO_Assign) 2257 if (MemberExpr *ME = dyn_cast<MemberExpr>(E->getLHS())) 2258 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2259 if (!FD->getType()->isReferenceType()) 2260 Decls.erase(FD); 2261 2262 Inherited::VisitBinaryOperator(E); 2263 } 2264 }; 2265 static void CheckInitExprContainsUninitializedFields( 2266 Sema &S, Expr *E, llvm::SmallPtrSet<ValueDecl*, 4> &Decls, 2267 const CXXConstructorDecl *Constructor) { 2268 if (Decls.size() == 0) 2269 return; 2270 2271 if (!E) 2272 return; 2273 2274 if (CXXDefaultInitExpr *Default = dyn_cast<CXXDefaultInitExpr>(E)) { 2275 E = Default->getExpr(); 2276 if (!E) 2277 return; 2278 // In class initializers will point to the constructor. 2279 UninitializedFieldVisitor(S, Decls, Constructor).Visit(E); 2280 } else { 2281 UninitializedFieldVisitor(S, Decls, 0).Visit(E); 2282 } 2283 } 2284 2285 // Diagnose value-uses of fields to initialize themselves, e.g. 2286 // foo(foo) 2287 // where foo is not also a parameter to the constructor. 2288 // Also diagnose across field uninitialized use such as 2289 // x(y), y(x) 2290 // TODO: implement -Wuninitialized and fold this into that framework. 2291 static void DiagnoseUninitializedFields( 2292 Sema &SemaRef, const CXXConstructorDecl *Constructor) { 2293 2294 if (SemaRef.getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, 2295 Constructor->getLocation()) 2296 == DiagnosticsEngine::Ignored) { 2297 return; 2298 } 2299 2300 if (Constructor->isInvalidDecl()) 2301 return; 2302 2303 const CXXRecordDecl *RD = Constructor->getParent(); 2304 2305 // Holds fields that are uninitialized. 2306 llvm::SmallPtrSet<ValueDecl*, 4> UninitializedFields; 2307 2308 // At the beginning, all fields are uninitialized. 2309 for (DeclContext::decl_iterator I = RD->decls_begin(), E = RD->decls_end(); 2310 I != E; ++I) { 2311 if (FieldDecl *FD = dyn_cast<FieldDecl>(*I)) { 2312 UninitializedFields.insert(FD); 2313 } else if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(*I)) { 2314 UninitializedFields.insert(IFD->getAnonField()); 2315 } 2316 } 2317 2318 for (CXXConstructorDecl::init_const_iterator FieldInit = 2319 Constructor->init_begin(), 2320 FieldInitEnd = Constructor->init_end(); 2321 FieldInit != FieldInitEnd; ++FieldInit) { 2322 2323 Expr *InitExpr = (*FieldInit)->getInit(); 2324 2325 CheckInitExprContainsUninitializedFields( 2326 SemaRef, InitExpr, UninitializedFields, Constructor); 2327 2328 if (FieldDecl *Field = (*FieldInit)->getAnyMember()) 2329 UninitializedFields.erase(Field); 2330 } 2331 } 2332 } // namespace 2333 2334 /// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2335 /// in-class initializer for a non-static C++ class member, and after 2336 /// instantiating an in-class initializer in a class template. Such actions 2337 /// are deferred until the class is complete. 2338 void 2339 Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2340 Expr *InitExpr) { 2341 FieldDecl *FD = cast<FieldDecl>(D); 2342 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2343 "must set init style when field is created"); 2344 2345 if (!InitExpr) { 2346 FD->setInvalidDecl(); 2347 FD->removeInClassInitializer(); 2348 return; 2349 } 2350 2351 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2352 FD->setInvalidDecl(); 2353 FD->removeInClassInitializer(); 2354 return; 2355 } 2356 2357 ExprResult Init = InitExpr; 2358 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2359 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2360 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2361 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2362 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2363 InitializationSequence Seq(*this, Entity, Kind, InitExpr); 2364 Init = Seq.Perform(*this, Entity, Kind, InitExpr); 2365 if (Init.isInvalid()) { 2366 FD->setInvalidDecl(); 2367 return; 2368 } 2369 } 2370 2371 // C++11 [class.base.init]p7: 2372 // The initialization of each base and member constitutes a 2373 // full-expression. 2374 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2375 if (Init.isInvalid()) { 2376 FD->setInvalidDecl(); 2377 return; 2378 } 2379 2380 InitExpr = Init.release(); 2381 2382 FD->setInClassInitializer(InitExpr); 2383 } 2384 2385 /// \brief Find the direct and/or virtual base specifiers that 2386 /// correspond to the given base type, for use in base initialization 2387 /// within a constructor. 2388 static bool FindBaseInitializer(Sema &SemaRef, 2389 CXXRecordDecl *ClassDecl, 2390 QualType BaseType, 2391 const CXXBaseSpecifier *&DirectBaseSpec, 2392 const CXXBaseSpecifier *&VirtualBaseSpec) { 2393 // First, check for a direct base class. 2394 DirectBaseSpec = 0; 2395 for (CXXRecordDecl::base_class_const_iterator Base 2396 = ClassDecl->bases_begin(); 2397 Base != ClassDecl->bases_end(); ++Base) { 2398 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2399 // We found a direct base of this type. That's what we're 2400 // initializing. 2401 DirectBaseSpec = &*Base; 2402 break; 2403 } 2404 } 2405 2406 // Check for a virtual base class. 2407 // FIXME: We might be able to short-circuit this if we know in advance that 2408 // there are no virtual bases. 2409 VirtualBaseSpec = 0; 2410 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2411 // We haven't found a base yet; search the class hierarchy for a 2412 // virtual base class. 2413 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2414 /*DetectVirtual=*/false); 2415 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2416 BaseType, Paths)) { 2417 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2418 Path != Paths.end(); ++Path) { 2419 if (Path->back().Base->isVirtual()) { 2420 VirtualBaseSpec = Path->back().Base; 2421 break; 2422 } 2423 } 2424 } 2425 } 2426 2427 return DirectBaseSpec || VirtualBaseSpec; 2428 } 2429 2430 /// \brief Handle a C++ member initializer using braced-init-list syntax. 2431 MemInitResult 2432 Sema::ActOnMemInitializer(Decl *ConstructorD, 2433 Scope *S, 2434 CXXScopeSpec &SS, 2435 IdentifierInfo *MemberOrBase, 2436 ParsedType TemplateTypeTy, 2437 const DeclSpec &DS, 2438 SourceLocation IdLoc, 2439 Expr *InitList, 2440 SourceLocation EllipsisLoc) { 2441 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2442 DS, IdLoc, InitList, 2443 EllipsisLoc); 2444 } 2445 2446 /// \brief Handle a C++ member initializer using parentheses syntax. 2447 MemInitResult 2448 Sema::ActOnMemInitializer(Decl *ConstructorD, 2449 Scope *S, 2450 CXXScopeSpec &SS, 2451 IdentifierInfo *MemberOrBase, 2452 ParsedType TemplateTypeTy, 2453 const DeclSpec &DS, 2454 SourceLocation IdLoc, 2455 SourceLocation LParenLoc, 2456 ArrayRef<Expr *> Args, 2457 SourceLocation RParenLoc, 2458 SourceLocation EllipsisLoc) { 2459 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2460 Args, RParenLoc); 2461 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2462 DS, IdLoc, List, EllipsisLoc); 2463 } 2464 2465 namespace { 2466 2467 // Callback to only accept typo corrections that can be a valid C++ member 2468 // intializer: either a non-static field member or a base class. 2469 class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2470 public: 2471 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2472 : ClassDecl(ClassDecl) {} 2473 2474 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 2475 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2476 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2477 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2478 return isa<TypeDecl>(ND); 2479 } 2480 return false; 2481 } 2482 2483 private: 2484 CXXRecordDecl *ClassDecl; 2485 }; 2486 2487 } 2488 2489 /// \brief Handle a C++ member initializer. 2490 MemInitResult 2491 Sema::BuildMemInitializer(Decl *ConstructorD, 2492 Scope *S, 2493 CXXScopeSpec &SS, 2494 IdentifierInfo *MemberOrBase, 2495 ParsedType TemplateTypeTy, 2496 const DeclSpec &DS, 2497 SourceLocation IdLoc, 2498 Expr *Init, 2499 SourceLocation EllipsisLoc) { 2500 if (!ConstructorD) 2501 return true; 2502 2503 AdjustDeclIfTemplate(ConstructorD); 2504 2505 CXXConstructorDecl *Constructor 2506 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2507 if (!Constructor) { 2508 // The user wrote a constructor initializer on a function that is 2509 // not a C++ constructor. Ignore the error for now, because we may 2510 // have more member initializers coming; we'll diagnose it just 2511 // once in ActOnMemInitializers. 2512 return true; 2513 } 2514 2515 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2516 2517 // C++ [class.base.init]p2: 2518 // Names in a mem-initializer-id are looked up in the scope of the 2519 // constructor's class and, if not found in that scope, are looked 2520 // up in the scope containing the constructor's definition. 2521 // [Note: if the constructor's class contains a member with the 2522 // same name as a direct or virtual base class of the class, a 2523 // mem-initializer-id naming the member or base class and composed 2524 // of a single identifier refers to the class member. A 2525 // mem-initializer-id for the hidden base class may be specified 2526 // using a qualified name. ] 2527 if (!SS.getScopeRep() && !TemplateTypeTy) { 2528 // Look for a member, first. 2529 DeclContext::lookup_result Result 2530 = ClassDecl->lookup(MemberOrBase); 2531 if (!Result.empty()) { 2532 ValueDecl *Member; 2533 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2534 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2535 if (EllipsisLoc.isValid()) 2536 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2537 << MemberOrBase 2538 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2539 2540 return BuildMemberInitializer(Member, Init, IdLoc); 2541 } 2542 } 2543 } 2544 // It didn't name a member, so see if it names a class. 2545 QualType BaseType; 2546 TypeSourceInfo *TInfo = 0; 2547 2548 if (TemplateTypeTy) { 2549 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2550 } else if (DS.getTypeSpecType() == TST_decltype) { 2551 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2552 } else { 2553 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2554 LookupParsedName(R, S, &SS); 2555 2556 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2557 if (!TyD) { 2558 if (R.isAmbiguous()) return true; 2559 2560 // We don't want access-control diagnostics here. 2561 R.suppressDiagnostics(); 2562 2563 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2564 bool NotUnknownSpecialization = false; 2565 DeclContext *DC = computeDeclContext(SS, false); 2566 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2567 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2568 2569 if (!NotUnknownSpecialization) { 2570 // When the scope specifier can refer to a member of an unknown 2571 // specialization, we take it as a type name. 2572 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2573 SS.getWithLocInContext(Context), 2574 *MemberOrBase, IdLoc); 2575 if (BaseType.isNull()) 2576 return true; 2577 2578 R.clear(); 2579 R.setLookupName(MemberOrBase); 2580 } 2581 } 2582 2583 // If no results were found, try to correct typos. 2584 TypoCorrection Corr; 2585 MemInitializerValidatorCCC Validator(ClassDecl); 2586 if (R.empty() && BaseType.isNull() && 2587 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2588 Validator, ClassDecl))) { 2589 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2590 // We have found a non-static data member with a similar 2591 // name to what was typed; complain and initialize that 2592 // member. 2593 diagnoseTypo(Corr, 2594 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2595 << MemberOrBase << true); 2596 return BuildMemberInitializer(Member, Init, IdLoc); 2597 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2598 const CXXBaseSpecifier *DirectBaseSpec; 2599 const CXXBaseSpecifier *VirtualBaseSpec; 2600 if (FindBaseInitializer(*this, ClassDecl, 2601 Context.getTypeDeclType(Type), 2602 DirectBaseSpec, VirtualBaseSpec)) { 2603 // We have found a direct or virtual base class with a 2604 // similar name to what was typed; complain and initialize 2605 // that base class. 2606 diagnoseTypo(Corr, 2607 PDiag(diag::err_mem_init_not_member_or_class_suggest) 2608 << MemberOrBase << false, 2609 PDiag() /*Suppress note, we provide our own.*/); 2610 2611 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec ? DirectBaseSpec 2612 : VirtualBaseSpec; 2613 Diag(BaseSpec->getLocStart(), 2614 diag::note_base_class_specified_here) 2615 << BaseSpec->getType() 2616 << BaseSpec->getSourceRange(); 2617 2618 TyD = Type; 2619 } 2620 } 2621 } 2622 2623 if (!TyD && BaseType.isNull()) { 2624 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2625 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2626 return true; 2627 } 2628 } 2629 2630 if (BaseType.isNull()) { 2631 BaseType = Context.getTypeDeclType(TyD); 2632 if (SS.isSet()) { 2633 NestedNameSpecifier *Qualifier = 2634 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2635 2636 // FIXME: preserve source range information 2637 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2638 } 2639 } 2640 } 2641 2642 if (!TInfo) 2643 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2644 2645 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2646 } 2647 2648 /// Checks a member initializer expression for cases where reference (or 2649 /// pointer) members are bound to by-value parameters (or their addresses). 2650 static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2651 Expr *Init, 2652 SourceLocation IdLoc) { 2653 QualType MemberTy = Member->getType(); 2654 2655 // We only handle pointers and references currently. 2656 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2657 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2658 return; 2659 2660 const bool IsPointer = MemberTy->isPointerType(); 2661 if (IsPointer) { 2662 if (const UnaryOperator *Op 2663 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2664 // The only case we're worried about with pointers requires taking the 2665 // address. 2666 if (Op->getOpcode() != UO_AddrOf) 2667 return; 2668 2669 Init = Op->getSubExpr(); 2670 } else { 2671 // We only handle address-of expression initializers for pointers. 2672 return; 2673 } 2674 } 2675 2676 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2677 // We only warn when referring to a non-reference parameter declaration. 2678 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2679 if (!Parameter || Parameter->getType()->isReferenceType()) 2680 return; 2681 2682 S.Diag(Init->getExprLoc(), 2683 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2684 : diag::warn_bind_ref_member_to_parameter) 2685 << Member << Parameter << Init->getSourceRange(); 2686 } else { 2687 // Other initializers are fine. 2688 return; 2689 } 2690 2691 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2692 << (unsigned)IsPointer; 2693 } 2694 2695 MemInitResult 2696 Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2697 SourceLocation IdLoc) { 2698 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2699 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2700 assert((DirectMember || IndirectMember) && 2701 "Member must be a FieldDecl or IndirectFieldDecl"); 2702 2703 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2704 return true; 2705 2706 if (Member->isInvalidDecl()) 2707 return true; 2708 2709 MultiExprArg Args; 2710 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2711 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2712 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2713 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); 2714 } else { 2715 // Template instantiation doesn't reconstruct ParenListExprs for us. 2716 Args = Init; 2717 } 2718 2719 SourceRange InitRange = Init->getSourceRange(); 2720 2721 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2722 // Can't check initialization for a member of dependent type or when 2723 // any of the arguments are type-dependent expressions. 2724 DiscardCleanupsInEvaluationContext(); 2725 } else { 2726 bool InitList = false; 2727 if (isa<InitListExpr>(Init)) { 2728 InitList = true; 2729 Args = Init; 2730 } 2731 2732 // Initialize the member. 2733 InitializedEntity MemberEntity = 2734 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2735 : InitializedEntity::InitializeMember(IndirectMember, 0); 2736 InitializationKind Kind = 2737 InitList ? InitializationKind::CreateDirectList(IdLoc) 2738 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2739 InitRange.getEnd()); 2740 2741 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); 2742 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0); 2743 if (MemberInit.isInvalid()) 2744 return true; 2745 2746 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc); 2747 2748 // C++11 [class.base.init]p7: 2749 // The initialization of each base and member constitutes a 2750 // full-expression. 2751 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2752 if (MemberInit.isInvalid()) 2753 return true; 2754 2755 Init = MemberInit.get(); 2756 } 2757 2758 if (DirectMember) { 2759 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2760 InitRange.getBegin(), Init, 2761 InitRange.getEnd()); 2762 } else { 2763 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2764 InitRange.getBegin(), Init, 2765 InitRange.getEnd()); 2766 } 2767 } 2768 2769 MemInitResult 2770 Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2771 CXXRecordDecl *ClassDecl) { 2772 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2773 if (!LangOpts.CPlusPlus11) 2774 return Diag(NameLoc, diag::err_delegating_ctor) 2775 << TInfo->getTypeLoc().getLocalSourceRange(); 2776 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2777 2778 bool InitList = true; 2779 MultiExprArg Args = Init; 2780 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2781 InitList = false; 2782 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2783 } 2784 2785 SourceRange InitRange = Init->getSourceRange(); 2786 // Initialize the object. 2787 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2788 QualType(ClassDecl->getTypeForDecl(), 0)); 2789 InitializationKind Kind = 2790 InitList ? InitializationKind::CreateDirectList(NameLoc) 2791 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2792 InitRange.getEnd()); 2793 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); 2794 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2795 Args, 0); 2796 if (DelegationInit.isInvalid()) 2797 return true; 2798 2799 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2800 "Delegating constructor with no target?"); 2801 2802 // C++11 [class.base.init]p7: 2803 // The initialization of each base and member constitutes a 2804 // full-expression. 2805 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2806 InitRange.getBegin()); 2807 if (DelegationInit.isInvalid()) 2808 return true; 2809 2810 // If we are in a dependent context, template instantiation will 2811 // perform this type-checking again. Just save the arguments that we 2812 // received in a ParenListExpr. 2813 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2814 // of the information that we have about the base 2815 // initializer. However, deconstructing the ASTs is a dicey process, 2816 // and this approach is far more likely to get the corner cases right. 2817 if (CurContext->isDependentContext()) 2818 DelegationInit = Owned(Init); 2819 2820 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2821 DelegationInit.takeAs<Expr>(), 2822 InitRange.getEnd()); 2823 } 2824 2825 MemInitResult 2826 Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2827 Expr *Init, CXXRecordDecl *ClassDecl, 2828 SourceLocation EllipsisLoc) { 2829 SourceLocation BaseLoc 2830 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2831 2832 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2833 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2834 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2835 2836 // C++ [class.base.init]p2: 2837 // [...] Unless the mem-initializer-id names a nonstatic data 2838 // member of the constructor's class or a direct or virtual base 2839 // of that class, the mem-initializer is ill-formed. A 2840 // mem-initializer-list can initialize a base class using any 2841 // name that denotes that base class type. 2842 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2843 2844 SourceRange InitRange = Init->getSourceRange(); 2845 if (EllipsisLoc.isValid()) { 2846 // This is a pack expansion. 2847 if (!BaseType->containsUnexpandedParameterPack()) { 2848 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2849 << SourceRange(BaseLoc, InitRange.getEnd()); 2850 2851 EllipsisLoc = SourceLocation(); 2852 } 2853 } else { 2854 // Check for any unexpanded parameter packs. 2855 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2856 return true; 2857 2858 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2859 return true; 2860 } 2861 2862 // Check for direct and virtual base classes. 2863 const CXXBaseSpecifier *DirectBaseSpec = 0; 2864 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2865 if (!Dependent) { 2866 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2867 BaseType)) 2868 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2869 2870 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2871 VirtualBaseSpec); 2872 2873 // C++ [base.class.init]p2: 2874 // Unless the mem-initializer-id names a nonstatic data member of the 2875 // constructor's class or a direct or virtual base of that class, the 2876 // mem-initializer is ill-formed. 2877 if (!DirectBaseSpec && !VirtualBaseSpec) { 2878 // If the class has any dependent bases, then it's possible that 2879 // one of those types will resolve to the same type as 2880 // BaseType. Therefore, just treat this as a dependent base 2881 // class initialization. FIXME: Should we try to check the 2882 // initialization anyway? It seems odd. 2883 if (ClassDecl->hasAnyDependentBases()) 2884 Dependent = true; 2885 else 2886 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2887 << BaseType << Context.getTypeDeclType(ClassDecl) 2888 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2889 } 2890 } 2891 2892 if (Dependent) { 2893 DiscardCleanupsInEvaluationContext(); 2894 2895 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2896 /*IsVirtual=*/false, 2897 InitRange.getBegin(), Init, 2898 InitRange.getEnd(), EllipsisLoc); 2899 } 2900 2901 // C++ [base.class.init]p2: 2902 // If a mem-initializer-id is ambiguous because it designates both 2903 // a direct non-virtual base class and an inherited virtual base 2904 // class, the mem-initializer is ill-formed. 2905 if (DirectBaseSpec && VirtualBaseSpec) 2906 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2907 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2908 2909 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec; 2910 if (!BaseSpec) 2911 BaseSpec = VirtualBaseSpec; 2912 2913 // Initialize the base. 2914 bool InitList = true; 2915 MultiExprArg Args = Init; 2916 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2917 InitList = false; 2918 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2919 } 2920 2921 InitializedEntity BaseEntity = 2922 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2923 InitializationKind Kind = 2924 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2925 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2926 InitRange.getEnd()); 2927 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); 2928 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0); 2929 if (BaseInit.isInvalid()) 2930 return true; 2931 2932 // C++11 [class.base.init]p7: 2933 // The initialization of each base and member constitutes a 2934 // full-expression. 2935 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2936 if (BaseInit.isInvalid()) 2937 return true; 2938 2939 // If we are in a dependent context, template instantiation will 2940 // perform this type-checking again. Just save the arguments that we 2941 // received in a ParenListExpr. 2942 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2943 // of the information that we have about the base 2944 // initializer. However, deconstructing the ASTs is a dicey process, 2945 // and this approach is far more likely to get the corner cases right. 2946 if (CurContext->isDependentContext()) 2947 BaseInit = Owned(Init); 2948 2949 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2950 BaseSpec->isVirtual(), 2951 InitRange.getBegin(), 2952 BaseInit.takeAs<Expr>(), 2953 InitRange.getEnd(), EllipsisLoc); 2954 } 2955 2956 // Create a static_cast\<T&&>(expr). 2957 static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2958 if (T.isNull()) T = E->getType(); 2959 QualType TargetType = SemaRef.BuildReferenceType( 2960 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2961 SourceLocation ExprLoc = E->getLocStart(); 2962 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2963 TargetType, ExprLoc); 2964 2965 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2966 SourceRange(ExprLoc, ExprLoc), 2967 E->getSourceRange()).take(); 2968 } 2969 2970 /// ImplicitInitializerKind - How an implicit base or member initializer should 2971 /// initialize its base or member. 2972 enum ImplicitInitializerKind { 2973 IIK_Default, 2974 IIK_Copy, 2975 IIK_Move, 2976 IIK_Inherit 2977 }; 2978 2979 static bool 2980 BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2981 ImplicitInitializerKind ImplicitInitKind, 2982 CXXBaseSpecifier *BaseSpec, 2983 bool IsInheritedVirtualBase, 2984 CXXCtorInitializer *&CXXBaseInit) { 2985 InitializedEntity InitEntity 2986 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2987 IsInheritedVirtualBase); 2988 2989 ExprResult BaseInit; 2990 2991 switch (ImplicitInitKind) { 2992 case IIK_Inherit: { 2993 const CXXRecordDecl *Inherited = 2994 Constructor->getInheritedConstructor()->getParent(); 2995 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2996 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2997 // C++11 [class.inhctor]p8: 2998 // Each expression in the expression-list is of the form 2999 // static_cast<T&&>(p), where p is the name of the corresponding 3000 // constructor parameter and T is the declared type of p. 3001 SmallVector<Expr*, 16> Args; 3002 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 3003 ParmVarDecl *PD = Constructor->getParamDecl(I); 3004 ExprResult ArgExpr = 3005 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 3006 VK_LValue, SourceLocation()); 3007 if (ArgExpr.isInvalid()) 3008 return true; 3009 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 3010 } 3011 3012 InitializationKind InitKind = InitializationKind::CreateDirect( 3013 Constructor->getLocation(), SourceLocation(), SourceLocation()); 3014 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args); 3015 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 3016 break; 3017 } 3018 } 3019 // Fall through. 3020 case IIK_Default: { 3021 InitializationKind InitKind 3022 = InitializationKind::CreateDefault(Constructor->getLocation()); 3023 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3024 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3025 break; 3026 } 3027 3028 case IIK_Move: 3029 case IIK_Copy: { 3030 bool Moving = ImplicitInitKind == IIK_Move; 3031 ParmVarDecl *Param = Constructor->getParamDecl(0); 3032 QualType ParamType = Param->getType().getNonReferenceType(); 3033 3034 Expr *CopyCtorArg = 3035 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 3036 SourceLocation(), Param, false, 3037 Constructor->getLocation(), ParamType, 3038 VK_LValue, 0); 3039 3040 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 3041 3042 // Cast to the base class to avoid ambiguities. 3043 QualType ArgTy = 3044 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 3045 ParamType.getQualifiers()); 3046 3047 if (Moving) { 3048 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 3049 } 3050 3051 CXXCastPath BasePath; 3052 BasePath.push_back(BaseSpec); 3053 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 3054 CK_UncheckedDerivedToBase, 3055 Moving ? VK_XValue : VK_LValue, 3056 &BasePath).take(); 3057 3058 InitializationKind InitKind 3059 = InitializationKind::CreateDirect(Constructor->getLocation(), 3060 SourceLocation(), SourceLocation()); 3061 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); 3062 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); 3063 break; 3064 } 3065 } 3066 3067 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 3068 if (BaseInit.isInvalid()) 3069 return true; 3070 3071 CXXBaseInit = 3072 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3073 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 3074 SourceLocation()), 3075 BaseSpec->isVirtual(), 3076 SourceLocation(), 3077 BaseInit.takeAs<Expr>(), 3078 SourceLocation(), 3079 SourceLocation()); 3080 3081 return false; 3082 } 3083 3084 static bool RefersToRValueRef(Expr *MemRef) { 3085 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 3086 return Referenced->getType()->isRValueReferenceType(); 3087 } 3088 3089 static bool 3090 BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 3091 ImplicitInitializerKind ImplicitInitKind, 3092 FieldDecl *Field, IndirectFieldDecl *Indirect, 3093 CXXCtorInitializer *&CXXMemberInit) { 3094 if (Field->isInvalidDecl()) 3095 return true; 3096 3097 SourceLocation Loc = Constructor->getLocation(); 3098 3099 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 3100 bool Moving = ImplicitInitKind == IIK_Move; 3101 ParmVarDecl *Param = Constructor->getParamDecl(0); 3102 QualType ParamType = Param->getType().getNonReferenceType(); 3103 3104 // Suppress copying zero-width bitfields. 3105 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 3106 return false; 3107 3108 Expr *MemberExprBase = 3109 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 3110 SourceLocation(), Param, false, 3111 Loc, ParamType, VK_LValue, 0); 3112 3113 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 3114 3115 if (Moving) { 3116 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 3117 } 3118 3119 // Build a reference to this field within the parameter. 3120 CXXScopeSpec SS; 3121 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 3122 Sema::LookupMemberName); 3123 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 3124 : cast<ValueDecl>(Field), AS_public); 3125 MemberLookup.resolveKind(); 3126 ExprResult CtorArg 3127 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 3128 ParamType, Loc, 3129 /*IsArrow=*/false, 3130 SS, 3131 /*TemplateKWLoc=*/SourceLocation(), 3132 /*FirstQualifierInScope=*/0, 3133 MemberLookup, 3134 /*TemplateArgs=*/0); 3135 if (CtorArg.isInvalid()) 3136 return true; 3137 3138 // C++11 [class.copy]p15: 3139 // - if a member m has rvalue reference type T&&, it is direct-initialized 3140 // with static_cast<T&&>(x.m); 3141 if (RefersToRValueRef(CtorArg.get())) { 3142 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3143 } 3144 3145 // When the field we are copying is an array, create index variables for 3146 // each dimension of the array. We use these index variables to subscript 3147 // the source array, and other clients (e.g., CodeGen) will perform the 3148 // necessary iteration with these index variables. 3149 SmallVector<VarDecl *, 4> IndexVariables; 3150 QualType BaseType = Field->getType(); 3151 QualType SizeType = SemaRef.Context.getSizeType(); 3152 bool InitializingArray = false; 3153 while (const ConstantArrayType *Array 3154 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 3155 InitializingArray = true; 3156 // Create the iteration variable for this array index. 3157 IdentifierInfo *IterationVarName = 0; 3158 { 3159 SmallString<8> Str; 3160 llvm::raw_svector_ostream OS(Str); 3161 OS << "__i" << IndexVariables.size(); 3162 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 3163 } 3164 VarDecl *IterationVar 3165 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 3166 IterationVarName, SizeType, 3167 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 3168 SC_None); 3169 IndexVariables.push_back(IterationVar); 3170 3171 // Create a reference to the iteration variable. 3172 ExprResult IterationVarRef 3173 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 3174 assert(!IterationVarRef.isInvalid() && 3175 "Reference to invented variable cannot fail!"); 3176 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 3177 assert(!IterationVarRef.isInvalid() && 3178 "Conversion of invented variable cannot fail!"); 3179 3180 // Subscript the array with this iteration variable. 3181 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3182 IterationVarRef.take(), 3183 Loc); 3184 if (CtorArg.isInvalid()) 3185 return true; 3186 3187 BaseType = Array->getElementType(); 3188 } 3189 3190 // The array subscript expression is an lvalue, which is wrong for moving. 3191 if (Moving && InitializingArray) 3192 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3193 3194 // Construct the entity that we will be initializing. For an array, this 3195 // will be first element in the array, which may require several levels 3196 // of array-subscript entities. 3197 SmallVector<InitializedEntity, 4> Entities; 3198 Entities.reserve(1 + IndexVariables.size()); 3199 if (Indirect) 3200 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3201 else 3202 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3203 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3204 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3205 0, 3206 Entities.back())); 3207 3208 // Direct-initialize to use the copy constructor. 3209 InitializationKind InitKind = 3210 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3211 3212 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3213 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE); 3214 3215 ExprResult MemberInit 3216 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3217 MultiExprArg(&CtorArgE, 1)); 3218 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3219 if (MemberInit.isInvalid()) 3220 return true; 3221 3222 if (Indirect) { 3223 assert(IndexVariables.size() == 0 && 3224 "Indirect field improperly initialized"); 3225 CXXMemberInit 3226 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3227 Loc, Loc, 3228 MemberInit.takeAs<Expr>(), 3229 Loc); 3230 } else 3231 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3232 Loc, MemberInit.takeAs<Expr>(), 3233 Loc, 3234 IndexVariables.data(), 3235 IndexVariables.size()); 3236 return false; 3237 } 3238 3239 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3240 "Unhandled implicit init kind!"); 3241 3242 QualType FieldBaseElementType = 3243 SemaRef.Context.getBaseElementType(Field->getType()); 3244 3245 if (FieldBaseElementType->isRecordType()) { 3246 InitializedEntity InitEntity 3247 = Indirect? InitializedEntity::InitializeMember(Indirect) 3248 : InitializedEntity::InitializeMember(Field); 3249 InitializationKind InitKind = 3250 InitializationKind::CreateDefault(Loc); 3251 3252 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3253 ExprResult MemberInit = 3254 InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3255 3256 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3257 if (MemberInit.isInvalid()) 3258 return true; 3259 3260 if (Indirect) 3261 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3262 Indirect, Loc, 3263 Loc, 3264 MemberInit.get(), 3265 Loc); 3266 else 3267 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3268 Field, Loc, Loc, 3269 MemberInit.get(), 3270 Loc); 3271 return false; 3272 } 3273 3274 if (!Field->getParent()->isUnion()) { 3275 if (FieldBaseElementType->isReferenceType()) { 3276 SemaRef.Diag(Constructor->getLocation(), 3277 diag::err_uninitialized_member_in_ctor) 3278 << (int)Constructor->isImplicit() 3279 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3280 << 0 << Field->getDeclName(); 3281 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3282 return true; 3283 } 3284 3285 if (FieldBaseElementType.isConstQualified()) { 3286 SemaRef.Diag(Constructor->getLocation(), 3287 diag::err_uninitialized_member_in_ctor) 3288 << (int)Constructor->isImplicit() 3289 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3290 << 1 << Field->getDeclName(); 3291 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3292 return true; 3293 } 3294 } 3295 3296 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3297 FieldBaseElementType->isObjCRetainableType() && 3298 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3299 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3300 // ARC: 3301 // Default-initialize Objective-C pointers to NULL. 3302 CXXMemberInit 3303 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3304 Loc, Loc, 3305 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3306 Loc); 3307 return false; 3308 } 3309 3310 // Nothing to initialize. 3311 CXXMemberInit = 0; 3312 return false; 3313 } 3314 3315 namespace { 3316 struct BaseAndFieldInfo { 3317 Sema &S; 3318 CXXConstructorDecl *Ctor; 3319 bool AnyErrorsInInits; 3320 ImplicitInitializerKind IIK; 3321 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3322 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3323 3324 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3325 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3326 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3327 if (Generated && Ctor->isCopyConstructor()) 3328 IIK = IIK_Copy; 3329 else if (Generated && Ctor->isMoveConstructor()) 3330 IIK = IIK_Move; 3331 else if (Ctor->getInheritedConstructor()) 3332 IIK = IIK_Inherit; 3333 else 3334 IIK = IIK_Default; 3335 } 3336 3337 bool isImplicitCopyOrMove() const { 3338 switch (IIK) { 3339 case IIK_Copy: 3340 case IIK_Move: 3341 return true; 3342 3343 case IIK_Default: 3344 case IIK_Inherit: 3345 return false; 3346 } 3347 3348 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3349 } 3350 3351 bool addFieldInitializer(CXXCtorInitializer *Init) { 3352 AllToInit.push_back(Init); 3353 3354 // Check whether this initializer makes the field "used". 3355 if (Init->getInit()->HasSideEffects(S.Context)) 3356 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3357 3358 return false; 3359 } 3360 }; 3361 } 3362 3363 /// \brief Determine whether the given indirect field declaration is somewhere 3364 /// within an anonymous union. 3365 static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3366 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3367 CEnd = F->chain_end(); 3368 C != CEnd; ++C) 3369 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3370 if (Record->isUnion()) 3371 return true; 3372 3373 return false; 3374 } 3375 3376 /// \brief Determine whether the given type is an incomplete or zero-lenfgth 3377 /// array type. 3378 static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3379 if (T->isIncompleteArrayType()) 3380 return true; 3381 3382 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3383 if (!ArrayT->getSize()) 3384 return true; 3385 3386 T = ArrayT->getElementType(); 3387 } 3388 3389 return false; 3390 } 3391 3392 static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3393 FieldDecl *Field, 3394 IndirectFieldDecl *Indirect = 0) { 3395 if (Field->isInvalidDecl()) 3396 return false; 3397 3398 // Overwhelmingly common case: we have a direct initializer for this field. 3399 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3400 return Info.addFieldInitializer(Init); 3401 3402 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3403 // has a brace-or-equal-initializer, the entity is initialized as specified 3404 // in [dcl.init]. 3405 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3406 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3407 Info.Ctor->getLocation(), Field); 3408 CXXCtorInitializer *Init; 3409 if (Indirect) 3410 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3411 SourceLocation(), 3412 SourceLocation(), DIE, 3413 SourceLocation()); 3414 else 3415 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3416 SourceLocation(), 3417 SourceLocation(), DIE, 3418 SourceLocation()); 3419 return Info.addFieldInitializer(Init); 3420 } 3421 3422 // Don't build an implicit initializer for union members if none was 3423 // explicitly specified. 3424 if (Field->getParent()->isUnion() || 3425 (Indirect && isWithinAnonymousUnion(Indirect))) 3426 return false; 3427 3428 // Don't initialize incomplete or zero-length arrays. 3429 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3430 return false; 3431 3432 // Don't try to build an implicit initializer if there were semantic 3433 // errors in any of the initializers (and therefore we might be 3434 // missing some that the user actually wrote). 3435 if (Info.AnyErrorsInInits) 3436 return false; 3437 3438 CXXCtorInitializer *Init = 0; 3439 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3440 Indirect, Init)) 3441 return true; 3442 3443 if (!Init) 3444 return false; 3445 3446 return Info.addFieldInitializer(Init); 3447 } 3448 3449 bool 3450 Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3451 CXXCtorInitializer *Initializer) { 3452 assert(Initializer->isDelegatingInitializer()); 3453 Constructor->setNumCtorInitializers(1); 3454 CXXCtorInitializer **initializer = 3455 new (Context) CXXCtorInitializer*[1]; 3456 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3457 Constructor->setCtorInitializers(initializer); 3458 3459 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3460 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3461 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3462 } 3463 3464 DelegatingCtorDecls.push_back(Constructor); 3465 3466 return false; 3467 } 3468 3469 bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3470 ArrayRef<CXXCtorInitializer *> Initializers) { 3471 if (Constructor->isDependentContext()) { 3472 // Just store the initializers as written, they will be checked during 3473 // instantiation. 3474 if (!Initializers.empty()) { 3475 Constructor->setNumCtorInitializers(Initializers.size()); 3476 CXXCtorInitializer **baseOrMemberInitializers = 3477 new (Context) CXXCtorInitializer*[Initializers.size()]; 3478 memcpy(baseOrMemberInitializers, Initializers.data(), 3479 Initializers.size() * sizeof(CXXCtorInitializer*)); 3480 Constructor->setCtorInitializers(baseOrMemberInitializers); 3481 } 3482 3483 // Let template instantiation know whether we had errors. 3484 if (AnyErrors) 3485 Constructor->setInvalidDecl(); 3486 3487 return false; 3488 } 3489 3490 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3491 3492 // We need to build the initializer AST according to order of construction 3493 // and not what user specified in the Initializers list. 3494 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3495 if (!ClassDecl) 3496 return true; 3497 3498 bool HadError = false; 3499 3500 for (unsigned i = 0; i < Initializers.size(); i++) { 3501 CXXCtorInitializer *Member = Initializers[i]; 3502 3503 if (Member->isBaseInitializer()) 3504 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3505 else 3506 Info.AllBaseFields[Member->getAnyMember()] = Member; 3507 } 3508 3509 // Keep track of the direct virtual bases. 3510 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3511 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3512 E = ClassDecl->bases_end(); I != E; ++I) { 3513 if (I->isVirtual()) 3514 DirectVBases.insert(I); 3515 } 3516 3517 // Push virtual bases before others. 3518 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3519 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3520 3521 if (CXXCtorInitializer *Value 3522 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3523 // [class.base.init]p7, per DR257: 3524 // A mem-initializer where the mem-initializer-id names a virtual base 3525 // class is ignored during execution of a constructor of any class that 3526 // is not the most derived class. 3527 if (ClassDecl->isAbstract()) { 3528 // FIXME: Provide a fixit to remove the base specifier. This requires 3529 // tracking the location of the associated comma for a base specifier. 3530 Diag(Value->getSourceLocation(), diag::warn_abstract_vbase_init_ignored) 3531 << VBase->getType() << ClassDecl; 3532 DiagnoseAbstractType(ClassDecl); 3533 } 3534 3535 Info.AllToInit.push_back(Value); 3536 } else if (!AnyErrors && !ClassDecl->isAbstract()) { 3537 // [class.base.init]p8, per DR257: 3538 // If a given [...] base class is not named by a mem-initializer-id 3539 // [...] and the entity is not a virtual base class of an abstract 3540 // class, then [...] the entity is default-initialized. 3541 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3542 CXXCtorInitializer *CXXBaseInit; 3543 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3544 VBase, IsInheritedVirtualBase, 3545 CXXBaseInit)) { 3546 HadError = true; 3547 continue; 3548 } 3549 3550 Info.AllToInit.push_back(CXXBaseInit); 3551 } 3552 } 3553 3554 // Non-virtual bases. 3555 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3556 E = ClassDecl->bases_end(); Base != E; ++Base) { 3557 // Virtuals are in the virtual base list and already constructed. 3558 if (Base->isVirtual()) 3559 continue; 3560 3561 if (CXXCtorInitializer *Value 3562 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3563 Info.AllToInit.push_back(Value); 3564 } else if (!AnyErrors) { 3565 CXXCtorInitializer *CXXBaseInit; 3566 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3567 Base, /*IsInheritedVirtualBase=*/false, 3568 CXXBaseInit)) { 3569 HadError = true; 3570 continue; 3571 } 3572 3573 Info.AllToInit.push_back(CXXBaseInit); 3574 } 3575 } 3576 3577 // Fields. 3578 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3579 MemEnd = ClassDecl->decls_end(); 3580 Mem != MemEnd; ++Mem) { 3581 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3582 // C++ [class.bit]p2: 3583 // A declaration for a bit-field that omits the identifier declares an 3584 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3585 // initialized. 3586 if (F->isUnnamedBitfield()) 3587 continue; 3588 3589 // If we're not generating the implicit copy/move constructor, then we'll 3590 // handle anonymous struct/union fields based on their individual 3591 // indirect fields. 3592 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3593 continue; 3594 3595 if (CollectFieldInitializer(*this, Info, F)) 3596 HadError = true; 3597 continue; 3598 } 3599 3600 // Beyond this point, we only consider default initialization. 3601 if (Info.isImplicitCopyOrMove()) 3602 continue; 3603 3604 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3605 if (F->getType()->isIncompleteArrayType()) { 3606 assert(ClassDecl->hasFlexibleArrayMember() && 3607 "Incomplete array type is not valid"); 3608 continue; 3609 } 3610 3611 // Initialize each field of an anonymous struct individually. 3612 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3613 HadError = true; 3614 3615 continue; 3616 } 3617 } 3618 3619 unsigned NumInitializers = Info.AllToInit.size(); 3620 if (NumInitializers > 0) { 3621 Constructor->setNumCtorInitializers(NumInitializers); 3622 CXXCtorInitializer **baseOrMemberInitializers = 3623 new (Context) CXXCtorInitializer*[NumInitializers]; 3624 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3625 NumInitializers * sizeof(CXXCtorInitializer*)); 3626 Constructor->setCtorInitializers(baseOrMemberInitializers); 3627 3628 // Constructors implicitly reference the base and member 3629 // destructors. 3630 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3631 Constructor->getParent()); 3632 } 3633 3634 return HadError; 3635 } 3636 3637 static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3638 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3639 const RecordDecl *RD = RT->getDecl(); 3640 if (RD->isAnonymousStructOrUnion()) { 3641 for (RecordDecl::field_iterator Field = RD->field_begin(), 3642 E = RD->field_end(); Field != E; ++Field) 3643 PopulateKeysForFields(*Field, IdealInits); 3644 return; 3645 } 3646 } 3647 IdealInits.push_back(Field); 3648 } 3649 3650 static const void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3651 return Context.getCanonicalType(BaseType).getTypePtr(); 3652 } 3653 3654 static const void *GetKeyForMember(ASTContext &Context, 3655 CXXCtorInitializer *Member) { 3656 if (!Member->isAnyMemberInitializer()) 3657 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3658 3659 return Member->getAnyMember(); 3660 } 3661 3662 static void DiagnoseBaseOrMemInitializerOrder( 3663 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3664 ArrayRef<CXXCtorInitializer *> Inits) { 3665 if (Constructor->getDeclContext()->isDependentContext()) 3666 return; 3667 3668 // Don't check initializers order unless the warning is enabled at the 3669 // location of at least one initializer. 3670 bool ShouldCheckOrder = false; 3671 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3672 CXXCtorInitializer *Init = Inits[InitIndex]; 3673 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3674 Init->getSourceLocation()) 3675 != DiagnosticsEngine::Ignored) { 3676 ShouldCheckOrder = true; 3677 break; 3678 } 3679 } 3680 if (!ShouldCheckOrder) 3681 return; 3682 3683 // Build the list of bases and members in the order that they'll 3684 // actually be initialized. The explicit initializers should be in 3685 // this same order but may be missing things. 3686 SmallVector<const void*, 32> IdealInitKeys; 3687 3688 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3689 3690 // 1. Virtual bases. 3691 for (CXXRecordDecl::base_class_const_iterator VBase = 3692 ClassDecl->vbases_begin(), 3693 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3694 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3695 3696 // 2. Non-virtual bases. 3697 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3698 E = ClassDecl->bases_end(); Base != E; ++Base) { 3699 if (Base->isVirtual()) 3700 continue; 3701 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3702 } 3703 3704 // 3. Direct fields. 3705 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3706 E = ClassDecl->field_end(); Field != E; ++Field) { 3707 if (Field->isUnnamedBitfield()) 3708 continue; 3709 3710 PopulateKeysForFields(*Field, IdealInitKeys); 3711 } 3712 3713 unsigned NumIdealInits = IdealInitKeys.size(); 3714 unsigned IdealIndex = 0; 3715 3716 CXXCtorInitializer *PrevInit = 0; 3717 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3718 CXXCtorInitializer *Init = Inits[InitIndex]; 3719 const void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3720 3721 // Scan forward to try to find this initializer in the idealized 3722 // initializers list. 3723 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3724 if (InitKey == IdealInitKeys[IdealIndex]) 3725 break; 3726 3727 // If we didn't find this initializer, it must be because we 3728 // scanned past it on a previous iteration. That can only 3729 // happen if we're out of order; emit a warning. 3730 if (IdealIndex == NumIdealInits && PrevInit) { 3731 Sema::SemaDiagnosticBuilder D = 3732 SemaRef.Diag(PrevInit->getSourceLocation(), 3733 diag::warn_initializer_out_of_order); 3734 3735 if (PrevInit->isAnyMemberInitializer()) 3736 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3737 else 3738 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3739 3740 if (Init->isAnyMemberInitializer()) 3741 D << 0 << Init->getAnyMember()->getDeclName(); 3742 else 3743 D << 1 << Init->getTypeSourceInfo()->getType(); 3744 3745 // Move back to the initializer's location in the ideal list. 3746 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3747 if (InitKey == IdealInitKeys[IdealIndex]) 3748 break; 3749 3750 assert(IdealIndex != NumIdealInits && 3751 "initializer not found in initializer list"); 3752 } 3753 3754 PrevInit = Init; 3755 } 3756 } 3757 3758 namespace { 3759 bool CheckRedundantInit(Sema &S, 3760 CXXCtorInitializer *Init, 3761 CXXCtorInitializer *&PrevInit) { 3762 if (!PrevInit) { 3763 PrevInit = Init; 3764 return false; 3765 } 3766 3767 if (FieldDecl *Field = Init->getAnyMember()) 3768 S.Diag(Init->getSourceLocation(), 3769 diag::err_multiple_mem_initialization) 3770 << Field->getDeclName() 3771 << Init->getSourceRange(); 3772 else { 3773 const Type *BaseClass = Init->getBaseClass(); 3774 assert(BaseClass && "neither field nor base"); 3775 S.Diag(Init->getSourceLocation(), 3776 diag::err_multiple_base_initialization) 3777 << QualType(BaseClass, 0) 3778 << Init->getSourceRange(); 3779 } 3780 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3781 << 0 << PrevInit->getSourceRange(); 3782 3783 return true; 3784 } 3785 3786 typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3787 typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3788 3789 bool CheckRedundantUnionInit(Sema &S, 3790 CXXCtorInitializer *Init, 3791 RedundantUnionMap &Unions) { 3792 FieldDecl *Field = Init->getAnyMember(); 3793 RecordDecl *Parent = Field->getParent(); 3794 NamedDecl *Child = Field; 3795 3796 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3797 if (Parent->isUnion()) { 3798 UnionEntry &En = Unions[Parent]; 3799 if (En.first && En.first != Child) { 3800 S.Diag(Init->getSourceLocation(), 3801 diag::err_multiple_mem_union_initialization) 3802 << Field->getDeclName() 3803 << Init->getSourceRange(); 3804 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3805 << 0 << En.second->getSourceRange(); 3806 return true; 3807 } 3808 if (!En.first) { 3809 En.first = Child; 3810 En.second = Init; 3811 } 3812 if (!Parent->isAnonymousStructOrUnion()) 3813 return false; 3814 } 3815 3816 Child = Parent; 3817 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3818 } 3819 3820 return false; 3821 } 3822 } 3823 3824 /// ActOnMemInitializers - Handle the member initializers for a constructor. 3825 void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3826 SourceLocation ColonLoc, 3827 ArrayRef<CXXCtorInitializer*> MemInits, 3828 bool AnyErrors) { 3829 if (!ConstructorDecl) 3830 return; 3831 3832 AdjustDeclIfTemplate(ConstructorDecl); 3833 3834 CXXConstructorDecl *Constructor 3835 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3836 3837 if (!Constructor) { 3838 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3839 return; 3840 } 3841 3842 // Mapping for the duplicate initializers check. 3843 // For member initializers, this is keyed with a FieldDecl*. 3844 // For base initializers, this is keyed with a Type*. 3845 llvm::DenseMap<const void *, CXXCtorInitializer *> Members; 3846 3847 // Mapping for the inconsistent anonymous-union initializers check. 3848 RedundantUnionMap MemberUnions; 3849 3850 bool HadError = false; 3851 for (unsigned i = 0; i < MemInits.size(); i++) { 3852 CXXCtorInitializer *Init = MemInits[i]; 3853 3854 // Set the source order index. 3855 Init->setSourceOrder(i); 3856 3857 if (Init->isAnyMemberInitializer()) { 3858 FieldDecl *Field = Init->getAnyMember(); 3859 if (CheckRedundantInit(*this, Init, Members[Field]) || 3860 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3861 HadError = true; 3862 } else if (Init->isBaseInitializer()) { 3863 const void *Key = 3864 GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3865 if (CheckRedundantInit(*this, Init, Members[Key])) 3866 HadError = true; 3867 } else { 3868 assert(Init->isDelegatingInitializer()); 3869 // This must be the only initializer 3870 if (MemInits.size() != 1) { 3871 Diag(Init->getSourceLocation(), 3872 diag::err_delegating_initializer_alone) 3873 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3874 // We will treat this as being the only initializer. 3875 } 3876 SetDelegatingInitializer(Constructor, MemInits[i]); 3877 // Return immediately as the initializer is set. 3878 return; 3879 } 3880 } 3881 3882 if (HadError) 3883 return; 3884 3885 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3886 3887 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3888 3889 DiagnoseUninitializedFields(*this, Constructor); 3890 } 3891 3892 void 3893 Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3894 CXXRecordDecl *ClassDecl) { 3895 // Ignore dependent contexts. Also ignore unions, since their members never 3896 // have destructors implicitly called. 3897 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3898 return; 3899 3900 // FIXME: all the access-control diagnostics are positioned on the 3901 // field/base declaration. That's probably good; that said, the 3902 // user might reasonably want to know why the destructor is being 3903 // emitted, and we currently don't say. 3904 3905 // Non-static data members. 3906 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3907 E = ClassDecl->field_end(); I != E; ++I) { 3908 FieldDecl *Field = *I; 3909 if (Field->isInvalidDecl()) 3910 continue; 3911 3912 // Don't destroy incomplete or zero-length arrays. 3913 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3914 continue; 3915 3916 QualType FieldType = Context.getBaseElementType(Field->getType()); 3917 3918 const RecordType* RT = FieldType->getAs<RecordType>(); 3919 if (!RT) 3920 continue; 3921 3922 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3923 if (FieldClassDecl->isInvalidDecl()) 3924 continue; 3925 if (FieldClassDecl->hasIrrelevantDestructor()) 3926 continue; 3927 // The destructor for an implicit anonymous union member is never invoked. 3928 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3929 continue; 3930 3931 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3932 assert(Dtor && "No dtor found for FieldClassDecl!"); 3933 CheckDestructorAccess(Field->getLocation(), Dtor, 3934 PDiag(diag::err_access_dtor_field) 3935 << Field->getDeclName() 3936 << FieldType); 3937 3938 MarkFunctionReferenced(Location, Dtor); 3939 DiagnoseUseOfDecl(Dtor, Location); 3940 } 3941 3942 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3943 3944 // Bases. 3945 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3946 E = ClassDecl->bases_end(); Base != E; ++Base) { 3947 // Bases are always records in a well-formed non-dependent class. 3948 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3949 3950 // Remember direct virtual bases. 3951 if (Base->isVirtual()) 3952 DirectVirtualBases.insert(RT); 3953 3954 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3955 // If our base class is invalid, we probably can't get its dtor anyway. 3956 if (BaseClassDecl->isInvalidDecl()) 3957 continue; 3958 if (BaseClassDecl->hasIrrelevantDestructor()) 3959 continue; 3960 3961 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3962 assert(Dtor && "No dtor found for BaseClassDecl!"); 3963 3964 // FIXME: caret should be on the start of the class name 3965 CheckDestructorAccess(Base->getLocStart(), Dtor, 3966 PDiag(diag::err_access_dtor_base) 3967 << Base->getType() 3968 << Base->getSourceRange(), 3969 Context.getTypeDeclType(ClassDecl)); 3970 3971 MarkFunctionReferenced(Location, Dtor); 3972 DiagnoseUseOfDecl(Dtor, Location); 3973 } 3974 3975 // Virtual bases. 3976 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3977 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3978 3979 // Bases are always records in a well-formed non-dependent class. 3980 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3981 3982 // Ignore direct virtual bases. 3983 if (DirectVirtualBases.count(RT)) 3984 continue; 3985 3986 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3987 // If our base class is invalid, we probably can't get its dtor anyway. 3988 if (BaseClassDecl->isInvalidDecl()) 3989 continue; 3990 if (BaseClassDecl->hasIrrelevantDestructor()) 3991 continue; 3992 3993 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3994 assert(Dtor && "No dtor found for BaseClassDecl!"); 3995 if (CheckDestructorAccess( 3996 ClassDecl->getLocation(), Dtor, 3997 PDiag(diag::err_access_dtor_vbase) 3998 << Context.getTypeDeclType(ClassDecl) << VBase->getType(), 3999 Context.getTypeDeclType(ClassDecl)) == 4000 AR_accessible) { 4001 CheckDerivedToBaseConversion( 4002 Context.getTypeDeclType(ClassDecl), VBase->getType(), 4003 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), 4004 SourceRange(), DeclarationName(), 0); 4005 } 4006 4007 MarkFunctionReferenced(Location, Dtor); 4008 DiagnoseUseOfDecl(Dtor, Location); 4009 } 4010 } 4011 4012 void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 4013 if (!CDtorDecl) 4014 return; 4015 4016 if (CXXConstructorDecl *Constructor 4017 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) { 4018 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 4019 DiagnoseUninitializedFields(*this, Constructor); 4020 } 4021 } 4022 4023 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 4024 unsigned DiagID, AbstractDiagSelID SelID) { 4025 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 4026 unsigned DiagID; 4027 AbstractDiagSelID SelID; 4028 4029 public: 4030 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 4031 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 4032 4033 void diagnose(Sema &S, SourceLocation Loc, QualType T) LLVM_OVERRIDE { 4034 if (Suppressed) return; 4035 if (SelID == -1) 4036 S.Diag(Loc, DiagID) << T; 4037 else 4038 S.Diag(Loc, DiagID) << SelID << T; 4039 } 4040 } Diagnoser(DiagID, SelID); 4041 4042 return RequireNonAbstractType(Loc, T, Diagnoser); 4043 } 4044 4045 bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 4046 TypeDiagnoser &Diagnoser) { 4047 if (!getLangOpts().CPlusPlus) 4048 return false; 4049 4050 if (const ArrayType *AT = Context.getAsArrayType(T)) 4051 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 4052 4053 if (const PointerType *PT = T->getAs<PointerType>()) { 4054 // Find the innermost pointer type. 4055 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 4056 PT = T; 4057 4058 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 4059 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 4060 } 4061 4062 const RecordType *RT = T->getAs<RecordType>(); 4063 if (!RT) 4064 return false; 4065 4066 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4067 4068 // We can't answer whether something is abstract until it has a 4069 // definition. If it's currently being defined, we'll walk back 4070 // over all the declarations when we have a full definition. 4071 const CXXRecordDecl *Def = RD->getDefinition(); 4072 if (!Def || Def->isBeingDefined()) 4073 return false; 4074 4075 if (!RD->isAbstract()) 4076 return false; 4077 4078 Diagnoser.diagnose(*this, Loc, T); 4079 DiagnoseAbstractType(RD); 4080 4081 return true; 4082 } 4083 4084 void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 4085 // Check if we've already emitted the list of pure virtual functions 4086 // for this class. 4087 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 4088 return; 4089 4090 // If the diagnostic is suppressed, don't emit the notes. We're only 4091 // going to emit them once, so try to attach them to a diagnostic we're 4092 // actually going to show. 4093 if (Diags.isLastDiagnosticIgnored()) 4094 return; 4095 4096 CXXFinalOverriderMap FinalOverriders; 4097 RD->getFinalOverriders(FinalOverriders); 4098 4099 // Keep a set of seen pure methods so we won't diagnose the same method 4100 // more than once. 4101 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 4102 4103 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 4104 MEnd = FinalOverriders.end(); 4105 M != MEnd; 4106 ++M) { 4107 for (OverridingMethods::iterator SO = M->second.begin(), 4108 SOEnd = M->second.end(); 4109 SO != SOEnd; ++SO) { 4110 // C++ [class.abstract]p4: 4111 // A class is abstract if it contains or inherits at least one 4112 // pure virtual function for which the final overrider is pure 4113 // virtual. 4114 4115 // 4116 if (SO->second.size() != 1) 4117 continue; 4118 4119 if (!SO->second.front().Method->isPure()) 4120 continue; 4121 4122 if (!SeenPureMethods.insert(SO->second.front().Method)) 4123 continue; 4124 4125 Diag(SO->second.front().Method->getLocation(), 4126 diag::note_pure_virtual_function) 4127 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 4128 } 4129 } 4130 4131 if (!PureVirtualClassDiagSet) 4132 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 4133 PureVirtualClassDiagSet->insert(RD); 4134 } 4135 4136 namespace { 4137 struct AbstractUsageInfo { 4138 Sema &S; 4139 CXXRecordDecl *Record; 4140 CanQualType AbstractType; 4141 bool Invalid; 4142 4143 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 4144 : S(S), Record(Record), 4145 AbstractType(S.Context.getCanonicalType( 4146 S.Context.getTypeDeclType(Record))), 4147 Invalid(false) {} 4148 4149 void DiagnoseAbstractType() { 4150 if (Invalid) return; 4151 S.DiagnoseAbstractType(Record); 4152 Invalid = true; 4153 } 4154 4155 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 4156 }; 4157 4158 struct CheckAbstractUsage { 4159 AbstractUsageInfo &Info; 4160 const NamedDecl *Ctx; 4161 4162 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 4163 : Info(Info), Ctx(Ctx) {} 4164 4165 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4166 switch (TL.getTypeLocClass()) { 4167 #define ABSTRACT_TYPELOC(CLASS, PARENT) 4168 #define TYPELOC(CLASS, PARENT) \ 4169 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 4170 #include "clang/AST/TypeLocNodes.def" 4171 } 4172 } 4173 4174 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4175 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 4176 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4177 if (!TL.getArg(I)) 4178 continue; 4179 4180 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 4181 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 4182 } 4183 } 4184 4185 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4186 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 4187 } 4188 4189 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 4190 // Visit the type parameters from a permissive context. 4191 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 4192 TemplateArgumentLoc TAL = TL.getArgLoc(I); 4193 if (TAL.getArgument().getKind() == TemplateArgument::Type) 4194 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 4195 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 4196 // TODO: other template argument types? 4197 } 4198 } 4199 4200 // Visit pointee types from a permissive context. 4201 #define CheckPolymorphic(Type) \ 4202 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 4203 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 4204 } 4205 CheckPolymorphic(PointerTypeLoc) 4206 CheckPolymorphic(ReferenceTypeLoc) 4207 CheckPolymorphic(MemberPointerTypeLoc) 4208 CheckPolymorphic(BlockPointerTypeLoc) 4209 CheckPolymorphic(AtomicTypeLoc) 4210 4211 /// Handle all the types we haven't given a more specific 4212 /// implementation for above. 4213 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4214 // Every other kind of type that we haven't called out already 4215 // that has an inner type is either (1) sugar or (2) contains that 4216 // inner type in some way as a subobject. 4217 if (TypeLoc Next = TL.getNextTypeLoc()) 4218 return Visit(Next, Sel); 4219 4220 // If there's no inner type and we're in a permissive context, 4221 // don't diagnose. 4222 if (Sel == Sema::AbstractNone) return; 4223 4224 // Check whether the type matches the abstract type. 4225 QualType T = TL.getType(); 4226 if (T->isArrayType()) { 4227 Sel = Sema::AbstractArrayType; 4228 T = Info.S.Context.getBaseElementType(T); 4229 } 4230 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4231 if (CT != Info.AbstractType) return; 4232 4233 // It matched; do some magic. 4234 if (Sel == Sema::AbstractArrayType) { 4235 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4236 << T << TL.getSourceRange(); 4237 } else { 4238 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4239 << Sel << T << TL.getSourceRange(); 4240 } 4241 Info.DiagnoseAbstractType(); 4242 } 4243 }; 4244 4245 void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4246 Sema::AbstractDiagSelID Sel) { 4247 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4248 } 4249 4250 } 4251 4252 /// Check for invalid uses of an abstract type in a method declaration. 4253 static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4254 CXXMethodDecl *MD) { 4255 // No need to do the check on definitions, which require that 4256 // the return/param types be complete. 4257 if (MD->doesThisDeclarationHaveABody()) 4258 return; 4259 4260 // For safety's sake, just ignore it if we don't have type source 4261 // information. This should never happen for non-implicit methods, 4262 // but... 4263 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4264 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4265 } 4266 4267 /// Check for invalid uses of an abstract type within a class definition. 4268 static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4269 CXXRecordDecl *RD) { 4270 for (CXXRecordDecl::decl_iterator 4271 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4272 Decl *D = *I; 4273 if (D->isImplicit()) continue; 4274 4275 // Methods and method templates. 4276 if (isa<CXXMethodDecl>(D)) { 4277 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4278 } else if (isa<FunctionTemplateDecl>(D)) { 4279 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4280 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4281 4282 // Fields and static variables. 4283 } else if (isa<FieldDecl>(D)) { 4284 FieldDecl *FD = cast<FieldDecl>(D); 4285 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4286 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4287 } else if (isa<VarDecl>(D)) { 4288 VarDecl *VD = cast<VarDecl>(D); 4289 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4290 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4291 4292 // Nested classes and class templates. 4293 } else if (isa<CXXRecordDecl>(D)) { 4294 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4295 } else if (isa<ClassTemplateDecl>(D)) { 4296 CheckAbstractClassUsage(Info, 4297 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4298 } 4299 } 4300 } 4301 4302 /// \brief Perform semantic checks on a class definition that has been 4303 /// completing, introducing implicitly-declared members, checking for 4304 /// abstract types, etc. 4305 void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4306 if (!Record) 4307 return; 4308 4309 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4310 AbstractUsageInfo Info(*this, Record); 4311 CheckAbstractClassUsage(Info, Record); 4312 } 4313 4314 // If this is not an aggregate type and has no user-declared constructor, 4315 // complain about any non-static data members of reference or const scalar 4316 // type, since they will never get initializers. 4317 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4318 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4319 !Record->isLambda()) { 4320 bool Complained = false; 4321 for (RecordDecl::field_iterator F = Record->field_begin(), 4322 FEnd = Record->field_end(); 4323 F != FEnd; ++F) { 4324 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4325 continue; 4326 4327 if (F->getType()->isReferenceType() || 4328 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4329 if (!Complained) { 4330 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4331 << Record->getTagKind() << Record; 4332 Complained = true; 4333 } 4334 4335 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4336 << F->getType()->isReferenceType() 4337 << F->getDeclName(); 4338 } 4339 } 4340 } 4341 4342 if (Record->isDynamicClass() && !Record->isDependentType()) 4343 DynamicClasses.push_back(Record); 4344 4345 if (Record->getIdentifier()) { 4346 // C++ [class.mem]p13: 4347 // If T is the name of a class, then each of the following shall have a 4348 // name different from T: 4349 // - every member of every anonymous union that is a member of class T. 4350 // 4351 // C++ [class.mem]p14: 4352 // In addition, if class T has a user-declared constructor (12.1), every 4353 // non-static data member of class T shall have a name different from T. 4354 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4355 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4356 ++I) { 4357 NamedDecl *D = *I; 4358 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4359 isa<IndirectFieldDecl>(D)) { 4360 Diag(D->getLocation(), diag::err_member_name_of_class) 4361 << D->getDeclName(); 4362 break; 4363 } 4364 } 4365 } 4366 4367 // Warn if the class has virtual methods but non-virtual public destructor. 4368 if (Record->isPolymorphic() && !Record->isDependentType()) { 4369 CXXDestructorDecl *dtor = Record->getDestructor(); 4370 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4371 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4372 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4373 } 4374 4375 if (Record->isAbstract()) { 4376 if (FinalAttr *FA = Record->getAttr<FinalAttr>()) { 4377 Diag(Record->getLocation(), diag::warn_abstract_final_class) 4378 << FA->isSpelledAsSealed(); 4379 DiagnoseAbstractType(Record); 4380 } 4381 } 4382 4383 if (!Record->isDependentType()) { 4384 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4385 MEnd = Record->method_end(); 4386 M != MEnd; ++M) { 4387 // See if a method overloads virtual methods in a base 4388 // class without overriding any. 4389 if (!M->isStatic()) 4390 DiagnoseHiddenVirtualMethods(*M); 4391 4392 // Check whether the explicitly-defaulted special members are valid. 4393 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4394 CheckExplicitlyDefaultedSpecialMember(*M); 4395 4396 // For an explicitly defaulted or deleted special member, we defer 4397 // determining triviality until the class is complete. That time is now! 4398 if (!M->isImplicit() && !M->isUserProvided()) { 4399 CXXSpecialMember CSM = getSpecialMember(*M); 4400 if (CSM != CXXInvalid) { 4401 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4402 4403 // Inform the class that we've finished declaring this member. 4404 Record->finishedDefaultedOrDeletedMember(*M); 4405 } 4406 } 4407 } 4408 } 4409 4410 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4411 // function that is not a constructor declares that member function to be 4412 // const. [...] The class of which that function is a member shall be 4413 // a literal type. 4414 // 4415 // If the class has virtual bases, any constexpr members will already have 4416 // been diagnosed by the checks performed on the member declaration, so 4417 // suppress this (less useful) diagnostic. 4418 // 4419 // We delay this until we know whether an explicitly-defaulted (or deleted) 4420 // destructor for the class is trivial. 4421 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4422 !Record->isLiteral() && !Record->getNumVBases()) { 4423 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4424 MEnd = Record->method_end(); 4425 M != MEnd; ++M) { 4426 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4427 switch (Record->getTemplateSpecializationKind()) { 4428 case TSK_ImplicitInstantiation: 4429 case TSK_ExplicitInstantiationDeclaration: 4430 case TSK_ExplicitInstantiationDefinition: 4431 // If a template instantiates to a non-literal type, but its members 4432 // instantiate to constexpr functions, the template is technically 4433 // ill-formed, but we allow it for sanity. 4434 continue; 4435 4436 case TSK_Undeclared: 4437 case TSK_ExplicitSpecialization: 4438 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4439 diag::err_constexpr_method_non_literal); 4440 break; 4441 } 4442 4443 // Only produce one error per class. 4444 break; 4445 } 4446 } 4447 } 4448 4449 // Check to see if we're trying to lay out a struct using the ms_struct 4450 // attribute that is dynamic. 4451 if (Record->isMsStruct(Context) && Record->isDynamicClass()) { 4452 Diag(Record->getLocation(), diag::warn_pragma_ms_struct_failed); 4453 Record->dropAttr<MsStructAttr>(); 4454 } 4455 4456 // Declare inheriting constructors. We do this eagerly here because: 4457 // - The standard requires an eager diagnostic for conflicting inheriting 4458 // constructors from different classes. 4459 // - The lazy declaration of the other implicit constructors is so as to not 4460 // waste space and performance on classes that are not meant to be 4461 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4462 // have inheriting constructors. 4463 DeclareInheritingConstructors(Record); 4464 } 4465 4466 /// Is the special member function which would be selected to perform the 4467 /// specified operation on the specified class type a constexpr constructor? 4468 static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4469 Sema::CXXSpecialMember CSM, 4470 bool ConstArg) { 4471 Sema::SpecialMemberOverloadResult *SMOR = 4472 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4473 false, false, false, false); 4474 if (!SMOR || !SMOR->getMethod()) 4475 // A constructor we wouldn't select can't be "involved in initializing" 4476 // anything. 4477 return true; 4478 return SMOR->getMethod()->isConstexpr(); 4479 } 4480 4481 /// Determine whether the specified special member function would be constexpr 4482 /// if it were implicitly defined. 4483 static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4484 Sema::CXXSpecialMember CSM, 4485 bool ConstArg) { 4486 if (!S.getLangOpts().CPlusPlus11) 4487 return false; 4488 4489 // C++11 [dcl.constexpr]p4: 4490 // In the definition of a constexpr constructor [...] 4491 bool Ctor = true; 4492 switch (CSM) { 4493 case Sema::CXXDefaultConstructor: 4494 // Since default constructor lookup is essentially trivial (and cannot 4495 // involve, for instance, template instantiation), we compute whether a 4496 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4497 // 4498 // This is important for performance; we need to know whether the default 4499 // constructor is constexpr to determine whether the type is a literal type. 4500 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4501 4502 case Sema::CXXCopyConstructor: 4503 case Sema::CXXMoveConstructor: 4504 // For copy or move constructors, we need to perform overload resolution. 4505 break; 4506 4507 case Sema::CXXCopyAssignment: 4508 case Sema::CXXMoveAssignment: 4509 if (!S.getLangOpts().CPlusPlus1y) 4510 return false; 4511 // In C++1y, we need to perform overload resolution. 4512 Ctor = false; 4513 break; 4514 4515 case Sema::CXXDestructor: 4516 case Sema::CXXInvalid: 4517 return false; 4518 } 4519 4520 // -- if the class is a non-empty union, or for each non-empty anonymous 4521 // union member of a non-union class, exactly one non-static data member 4522 // shall be initialized; [DR1359] 4523 // 4524 // If we squint, this is guaranteed, since exactly one non-static data member 4525 // will be initialized (if the constructor isn't deleted), we just don't know 4526 // which one. 4527 if (Ctor && ClassDecl->isUnion()) 4528 return true; 4529 4530 // -- the class shall not have any virtual base classes; 4531 if (Ctor && ClassDecl->getNumVBases()) 4532 return false; 4533 4534 // C++1y [class.copy]p26: 4535 // -- [the class] is a literal type, and 4536 if (!Ctor && !ClassDecl->isLiteral()) 4537 return false; 4538 4539 // -- every constructor involved in initializing [...] base class 4540 // sub-objects shall be a constexpr constructor; 4541 // -- the assignment operator selected to copy/move each direct base 4542 // class is a constexpr function, and 4543 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4544 BEnd = ClassDecl->bases_end(); 4545 B != BEnd; ++B) { 4546 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4547 if (!BaseType) continue; 4548 4549 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4550 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4551 return false; 4552 } 4553 4554 // -- every constructor involved in initializing non-static data members 4555 // [...] shall be a constexpr constructor; 4556 // -- every non-static data member and base class sub-object shall be 4557 // initialized 4558 // -- for each non-stastic data member of X that is of class type (or array 4559 // thereof), the assignment operator selected to copy/move that member is 4560 // a constexpr function 4561 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4562 FEnd = ClassDecl->field_end(); 4563 F != FEnd; ++F) { 4564 if (F->isInvalidDecl()) 4565 continue; 4566 if (const RecordType *RecordTy = 4567 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4568 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4569 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4570 return false; 4571 } 4572 } 4573 4574 // All OK, it's constexpr! 4575 return true; 4576 } 4577 4578 static Sema::ImplicitExceptionSpecification 4579 computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4580 switch (S.getSpecialMember(MD)) { 4581 case Sema::CXXDefaultConstructor: 4582 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4583 case Sema::CXXCopyConstructor: 4584 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4585 case Sema::CXXCopyAssignment: 4586 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4587 case Sema::CXXMoveConstructor: 4588 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4589 case Sema::CXXMoveAssignment: 4590 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4591 case Sema::CXXDestructor: 4592 return S.ComputeDefaultedDtorExceptionSpec(MD); 4593 case Sema::CXXInvalid: 4594 break; 4595 } 4596 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4597 "only special members have implicit exception specs"); 4598 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4599 } 4600 4601 static void 4602 updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4603 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4604 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4605 ExceptSpec.getEPI(EPI); 4606 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4607 FPT->getArgTypes(), EPI)); 4608 } 4609 4610 static FunctionProtoType::ExtProtoInfo getImplicitMethodEPI(Sema &S, 4611 CXXMethodDecl *MD) { 4612 FunctionProtoType::ExtProtoInfo EPI; 4613 4614 // Build an exception specification pointing back at this member. 4615 EPI.ExceptionSpecType = EST_Unevaluated; 4616 EPI.ExceptionSpecDecl = MD; 4617 4618 // Set the calling convention to the default for C++ instance methods. 4619 EPI.ExtInfo = EPI.ExtInfo.withCallingConv( 4620 S.Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4621 /*IsCXXMethod=*/true)); 4622 return EPI; 4623 } 4624 4625 void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4626 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4627 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4628 return; 4629 4630 // Evaluate the exception specification. 4631 ImplicitExceptionSpecification ExceptSpec = 4632 computeImplicitExceptionSpec(*this, Loc, MD); 4633 4634 // Update the type of the special member to use it. 4635 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4636 4637 // A user-provided destructor can be defined outside the class. When that 4638 // happens, be sure to update the exception specification on both 4639 // declarations. 4640 const FunctionProtoType *CanonicalFPT = 4641 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4642 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4643 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4644 CanonicalFPT, ExceptSpec); 4645 } 4646 4647 void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4648 CXXRecordDecl *RD = MD->getParent(); 4649 CXXSpecialMember CSM = getSpecialMember(MD); 4650 4651 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4652 "not an explicitly-defaulted special member"); 4653 4654 // Whether this was the first-declared instance of the constructor. 4655 // This affects whether we implicitly add an exception spec and constexpr. 4656 bool First = MD == MD->getCanonicalDecl(); 4657 4658 bool HadError = false; 4659 4660 // C++11 [dcl.fct.def.default]p1: 4661 // A function that is explicitly defaulted shall 4662 // -- be a special member function (checked elsewhere), 4663 // -- have the same type (except for ref-qualifiers, and except that a 4664 // copy operation can take a non-const reference) as an implicit 4665 // declaration, and 4666 // -- not have default arguments. 4667 unsigned ExpectedParams = 1; 4668 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4669 ExpectedParams = 0; 4670 if (MD->getNumParams() != ExpectedParams) { 4671 // This also checks for default arguments: a copy or move constructor with a 4672 // default argument is classified as a default constructor, and assignment 4673 // operations and destructors can't have default arguments. 4674 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4675 << CSM << MD->getSourceRange(); 4676 HadError = true; 4677 } else if (MD->isVariadic()) { 4678 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4679 << CSM << MD->getSourceRange(); 4680 HadError = true; 4681 } 4682 4683 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4684 4685 bool CanHaveConstParam = false; 4686 if (CSM == CXXCopyConstructor) 4687 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4688 else if (CSM == CXXCopyAssignment) 4689 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4690 4691 QualType ReturnType = Context.VoidTy; 4692 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4693 // Check for return type matching. 4694 ReturnType = Type->getResultType(); 4695 QualType ExpectedReturnType = 4696 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4697 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4698 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4699 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4700 HadError = true; 4701 } 4702 4703 // A defaulted special member cannot have cv-qualifiers. 4704 if (Type->getTypeQuals()) { 4705 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4706 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4707 HadError = true; 4708 } 4709 } 4710 4711 // Check for parameter type matching. 4712 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4713 bool HasConstParam = false; 4714 if (ExpectedParams && ArgType->isReferenceType()) { 4715 // Argument must be reference to possibly-const T. 4716 QualType ReferentType = ArgType->getPointeeType(); 4717 HasConstParam = ReferentType.isConstQualified(); 4718 4719 if (ReferentType.isVolatileQualified()) { 4720 Diag(MD->getLocation(), 4721 diag::err_defaulted_special_member_volatile_param) << CSM; 4722 HadError = true; 4723 } 4724 4725 if (HasConstParam && !CanHaveConstParam) { 4726 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4727 Diag(MD->getLocation(), 4728 diag::err_defaulted_special_member_copy_const_param) 4729 << (CSM == CXXCopyAssignment); 4730 // FIXME: Explain why this special member can't be const. 4731 } else { 4732 Diag(MD->getLocation(), 4733 diag::err_defaulted_special_member_move_const_param) 4734 << (CSM == CXXMoveAssignment); 4735 } 4736 HadError = true; 4737 } 4738 } else if (ExpectedParams) { 4739 // A copy assignment operator can take its argument by value, but a 4740 // defaulted one cannot. 4741 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4742 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4743 HadError = true; 4744 } 4745 4746 // C++11 [dcl.fct.def.default]p2: 4747 // An explicitly-defaulted function may be declared constexpr only if it 4748 // would have been implicitly declared as constexpr, 4749 // Do not apply this rule to members of class templates, since core issue 1358 4750 // makes such functions always instantiate to constexpr functions. For 4751 // functions which cannot be constexpr (for non-constructors in C++11 and for 4752 // destructors in C++1y), this is checked elsewhere. 4753 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4754 HasConstParam); 4755 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4756 : isa<CXXConstructorDecl>(MD)) && 4757 MD->isConstexpr() && !Constexpr && 4758 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4759 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4760 // FIXME: Explain why the special member can't be constexpr. 4761 HadError = true; 4762 } 4763 4764 // and may have an explicit exception-specification only if it is compatible 4765 // with the exception-specification on the implicit declaration. 4766 if (Type->hasExceptionSpec()) { 4767 // Delay the check if this is the first declaration of the special member, 4768 // since we may not have parsed some necessary in-class initializers yet. 4769 if (First) { 4770 // If the exception specification needs to be instantiated, do so now, 4771 // before we clobber it with an EST_Unevaluated specification below. 4772 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4773 InstantiateExceptionSpec(MD->getLocStart(), MD); 4774 Type = MD->getType()->getAs<FunctionProtoType>(); 4775 } 4776 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4777 } else 4778 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4779 } 4780 4781 // If a function is explicitly defaulted on its first declaration, 4782 if (First) { 4783 // -- it is implicitly considered to be constexpr if the implicit 4784 // definition would be, 4785 MD->setConstexpr(Constexpr); 4786 4787 // -- it is implicitly considered to have the same exception-specification 4788 // as if it had been implicitly declared, 4789 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4790 EPI.ExceptionSpecType = EST_Unevaluated; 4791 EPI.ExceptionSpecDecl = MD; 4792 MD->setType(Context.getFunctionType(ReturnType, 4793 ArrayRef<QualType>(&ArgType, 4794 ExpectedParams), 4795 EPI)); 4796 } 4797 4798 if (ShouldDeleteSpecialMember(MD, CSM)) { 4799 if (First) { 4800 SetDeclDeleted(MD, MD->getLocation()); 4801 } else { 4802 // C++11 [dcl.fct.def.default]p4: 4803 // [For a] user-provided explicitly-defaulted function [...] if such a 4804 // function is implicitly defined as deleted, the program is ill-formed. 4805 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4806 HadError = true; 4807 } 4808 } 4809 4810 if (HadError) 4811 MD->setInvalidDecl(); 4812 } 4813 4814 /// Check whether the exception specification provided for an 4815 /// explicitly-defaulted special member matches the exception specification 4816 /// that would have been generated for an implicit special member, per 4817 /// C++11 [dcl.fct.def.default]p2. 4818 void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4819 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4820 // Compute the implicit exception specification. 4821 CallingConv CC = Context.getDefaultCallingConvention(/*IsVariadic=*/false, 4822 /*IsCXXMethod=*/true); 4823 FunctionProtoType::ExtProtoInfo EPI(CC); 4824 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4825 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4826 Context.getFunctionType(Context.VoidTy, None, EPI)); 4827 4828 // Ensure that it matches. 4829 CheckEquivalentExceptionSpec( 4830 PDiag(diag::err_incorrect_defaulted_exception_spec) 4831 << getSpecialMember(MD), PDiag(), 4832 ImplicitType, SourceLocation(), 4833 SpecifiedType, MD->getLocation()); 4834 } 4835 4836 void Sema::CheckDelayedMemberExceptionSpecs() { 4837 SmallVector<std::pair<const CXXDestructorDecl *, const CXXDestructorDecl *>, 4838 2> Checks; 4839 SmallVector<std::pair<CXXMethodDecl *, const FunctionProtoType *>, 2> Specs; 4840 4841 std::swap(Checks, DelayedDestructorExceptionSpecChecks); 4842 std::swap(Specs, DelayedDefaultedMemberExceptionSpecs); 4843 4844 // Perform any deferred checking of exception specifications for virtual 4845 // destructors. 4846 for (unsigned i = 0, e = Checks.size(); i != e; ++i) { 4847 const CXXDestructorDecl *Dtor = Checks[i].first; 4848 assert(!Dtor->getParent()->isDependentType() && 4849 "Should not ever add destructors of templates into the list."); 4850 CheckOverridingFunctionExceptionSpec(Dtor, Checks[i].second); 4851 } 4852 4853 // Check that any explicitly-defaulted methods have exception specifications 4854 // compatible with their implicit exception specifications. 4855 for (unsigned I = 0, N = Specs.size(); I != N; ++I) 4856 CheckExplicitlyDefaultedMemberExceptionSpec(Specs[I].first, 4857 Specs[I].second); 4858 } 4859 4860 namespace { 4861 struct SpecialMemberDeletionInfo { 4862 Sema &S; 4863 CXXMethodDecl *MD; 4864 Sema::CXXSpecialMember CSM; 4865 bool Diagnose; 4866 4867 // Properties of the special member, computed for convenience. 4868 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4869 SourceLocation Loc; 4870 4871 bool AllFieldsAreConst; 4872 4873 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4874 Sema::CXXSpecialMember CSM, bool Diagnose) 4875 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4876 IsConstructor(false), IsAssignment(false), IsMove(false), 4877 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4878 AllFieldsAreConst(true) { 4879 switch (CSM) { 4880 case Sema::CXXDefaultConstructor: 4881 case Sema::CXXCopyConstructor: 4882 IsConstructor = true; 4883 break; 4884 case Sema::CXXMoveConstructor: 4885 IsConstructor = true; 4886 IsMove = true; 4887 break; 4888 case Sema::CXXCopyAssignment: 4889 IsAssignment = true; 4890 break; 4891 case Sema::CXXMoveAssignment: 4892 IsAssignment = true; 4893 IsMove = true; 4894 break; 4895 case Sema::CXXDestructor: 4896 break; 4897 case Sema::CXXInvalid: 4898 llvm_unreachable("invalid special member kind"); 4899 } 4900 4901 if (MD->getNumParams()) { 4902 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4903 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4904 } 4905 } 4906 4907 bool inUnion() const { return MD->getParent()->isUnion(); } 4908 4909 /// Look up the corresponding special member in the given class. 4910 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4911 unsigned Quals) { 4912 unsigned TQ = MD->getTypeQualifiers(); 4913 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4914 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4915 Quals = 0; 4916 // cv-qualifiers on class members affect the type of both '*this' and the 4917 // argument for an assignment. 4918 if (IsAssignment) 4919 TQ |= Quals; 4920 return S.LookupSpecialMember(Class, CSM, 4921 ConstArg || (Quals & Qualifiers::Const), 4922 VolatileArg || (Quals & Qualifiers::Volatile), 4923 MD->getRefQualifier() == RQ_RValue, 4924 TQ & Qualifiers::Const, 4925 TQ & Qualifiers::Volatile); 4926 } 4927 4928 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4929 4930 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4931 bool shouldDeleteForField(FieldDecl *FD); 4932 bool shouldDeleteForAllConstMembers(); 4933 4934 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4935 unsigned Quals); 4936 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4937 Sema::SpecialMemberOverloadResult *SMOR, 4938 bool IsDtorCallInCtor); 4939 4940 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4941 }; 4942 } 4943 4944 /// Is the given special member inaccessible when used on the given 4945 /// sub-object. 4946 bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4947 CXXMethodDecl *target) { 4948 /// If we're operating on a base class, the object type is the 4949 /// type of this special member. 4950 QualType objectTy; 4951 AccessSpecifier access = target->getAccess(); 4952 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4953 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4954 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4955 4956 // If we're operating on a field, the object type is the type of the field. 4957 } else { 4958 objectTy = S.Context.getTypeDeclType(target->getParent()); 4959 } 4960 4961 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4962 } 4963 4964 /// Check whether we should delete a special member due to the implicit 4965 /// definition containing a call to a special member of a subobject. 4966 bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4967 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4968 bool IsDtorCallInCtor) { 4969 CXXMethodDecl *Decl = SMOR->getMethod(); 4970 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4971 4972 int DiagKind = -1; 4973 4974 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4975 DiagKind = !Decl ? 0 : 1; 4976 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4977 DiagKind = 2; 4978 else if (!isAccessible(Subobj, Decl)) 4979 DiagKind = 3; 4980 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4981 !Decl->isTrivial()) { 4982 // A member of a union must have a trivial corresponding special member. 4983 // As a weird special case, a destructor call from a union's constructor 4984 // must be accessible and non-deleted, but need not be trivial. Such a 4985 // destructor is never actually called, but is semantically checked as 4986 // if it were. 4987 DiagKind = 4; 4988 } 4989 4990 if (DiagKind == -1) 4991 return false; 4992 4993 if (Diagnose) { 4994 if (Field) { 4995 S.Diag(Field->getLocation(), 4996 diag::note_deleted_special_member_class_subobject) 4997 << CSM << MD->getParent() << /*IsField*/true 4998 << Field << DiagKind << IsDtorCallInCtor; 4999 } else { 5000 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 5001 S.Diag(Base->getLocStart(), 5002 diag::note_deleted_special_member_class_subobject) 5003 << CSM << MD->getParent() << /*IsField*/false 5004 << Base->getType() << DiagKind << IsDtorCallInCtor; 5005 } 5006 5007 if (DiagKind == 1) 5008 S.NoteDeletedFunction(Decl); 5009 // FIXME: Explain inaccessibility if DiagKind == 3. 5010 } 5011 5012 return true; 5013 } 5014 5015 /// Check whether we should delete a special member function due to having a 5016 /// direct or virtual base class or non-static data member of class type M. 5017 bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 5018 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 5019 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 5020 5021 // C++11 [class.ctor]p5: 5022 // -- any direct or virtual base class, or non-static data member with no 5023 // brace-or-equal-initializer, has class type M (or array thereof) and 5024 // either M has no default constructor or overload resolution as applied 5025 // to M's default constructor results in an ambiguity or in a function 5026 // that is deleted or inaccessible 5027 // C++11 [class.copy]p11, C++11 [class.copy]p23: 5028 // -- a direct or virtual base class B that cannot be copied/moved because 5029 // overload resolution, as applied to B's corresponding special member, 5030 // results in an ambiguity or a function that is deleted or inaccessible 5031 // from the defaulted special member 5032 // C++11 [class.dtor]p5: 5033 // -- any direct or virtual base class [...] has a type with a destructor 5034 // that is deleted or inaccessible 5035 if (!(CSM == Sema::CXXDefaultConstructor && 5036 Field && Field->hasInClassInitializer()) && 5037 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 5038 return true; 5039 5040 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 5041 // -- any direct or virtual base class or non-static data member has a 5042 // type with a destructor that is deleted or inaccessible 5043 if (IsConstructor) { 5044 Sema::SpecialMemberOverloadResult *SMOR = 5045 S.LookupSpecialMember(Class, Sema::CXXDestructor, 5046 false, false, false, false, false); 5047 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 5048 return true; 5049 } 5050 5051 return false; 5052 } 5053 5054 /// Check whether we should delete a special member function due to the class 5055 /// having a particular direct or virtual base class. 5056 bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 5057 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 5058 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 5059 } 5060 5061 /// Check whether we should delete a special member function due to the class 5062 /// having a particular non-static data member. 5063 bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 5064 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 5065 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 5066 5067 if (CSM == Sema::CXXDefaultConstructor) { 5068 // For a default constructor, all references must be initialized in-class 5069 // and, if a union, it must have a non-const member. 5070 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 5071 if (Diagnose) 5072 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 5073 << MD->getParent() << FD << FieldType << /*Reference*/0; 5074 return true; 5075 } 5076 // C++11 [class.ctor]p5: any non-variant non-static data member of 5077 // const-qualified type (or array thereof) with no 5078 // brace-or-equal-initializer does not have a user-provided default 5079 // constructor. 5080 if (!inUnion() && FieldType.isConstQualified() && 5081 !FD->hasInClassInitializer() && 5082 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 5083 if (Diagnose) 5084 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 5085 << MD->getParent() << FD << FD->getType() << /*Const*/1; 5086 return true; 5087 } 5088 5089 if (inUnion() && !FieldType.isConstQualified()) 5090 AllFieldsAreConst = false; 5091 } else if (CSM == Sema::CXXCopyConstructor) { 5092 // For a copy constructor, data members must not be of rvalue reference 5093 // type. 5094 if (FieldType->isRValueReferenceType()) { 5095 if (Diagnose) 5096 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 5097 << MD->getParent() << FD << FieldType; 5098 return true; 5099 } 5100 } else if (IsAssignment) { 5101 // For an assignment operator, data members must not be of reference type. 5102 if (FieldType->isReferenceType()) { 5103 if (Diagnose) 5104 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 5105 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 5106 return true; 5107 } 5108 if (!FieldRecord && FieldType.isConstQualified()) { 5109 // C++11 [class.copy]p23: 5110 // -- a non-static data member of const non-class type (or array thereof) 5111 if (Diagnose) 5112 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 5113 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 5114 return true; 5115 } 5116 } 5117 5118 if (FieldRecord) { 5119 // Some additional restrictions exist on the variant members. 5120 if (!inUnion() && FieldRecord->isUnion() && 5121 FieldRecord->isAnonymousStructOrUnion()) { 5122 bool AllVariantFieldsAreConst = true; 5123 5124 // FIXME: Handle anonymous unions declared within anonymous unions. 5125 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 5126 UE = FieldRecord->field_end(); 5127 UI != UE; ++UI) { 5128 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 5129 5130 if (!UnionFieldType.isConstQualified()) 5131 AllVariantFieldsAreConst = false; 5132 5133 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 5134 if (UnionFieldRecord && 5135 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 5136 UnionFieldType.getCVRQualifiers())) 5137 return true; 5138 } 5139 5140 // At least one member in each anonymous union must be non-const 5141 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 5142 FieldRecord->field_begin() != FieldRecord->field_end()) { 5143 if (Diagnose) 5144 S.Diag(FieldRecord->getLocation(), 5145 diag::note_deleted_default_ctor_all_const) 5146 << MD->getParent() << /*anonymous union*/1; 5147 return true; 5148 } 5149 5150 // Don't check the implicit member of the anonymous union type. 5151 // This is technically non-conformant, but sanity demands it. 5152 return false; 5153 } 5154 5155 if (shouldDeleteForClassSubobject(FieldRecord, FD, 5156 FieldType.getCVRQualifiers())) 5157 return true; 5158 } 5159 5160 return false; 5161 } 5162 5163 /// C++11 [class.ctor] p5: 5164 /// A defaulted default constructor for a class X is defined as deleted if 5165 /// X is a union and all of its variant members are of const-qualified type. 5166 bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 5167 // This is a silly definition, because it gives an empty union a deleted 5168 // default constructor. Don't do that. 5169 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 5170 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 5171 if (Diagnose) 5172 S.Diag(MD->getParent()->getLocation(), 5173 diag::note_deleted_default_ctor_all_const) 5174 << MD->getParent() << /*not anonymous union*/0; 5175 return true; 5176 } 5177 return false; 5178 } 5179 5180 /// Determine whether a defaulted special member function should be defined as 5181 /// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 5182 /// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 5183 bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 5184 bool Diagnose) { 5185 if (MD->isInvalidDecl()) 5186 return false; 5187 CXXRecordDecl *RD = MD->getParent(); 5188 assert(!RD->isDependentType() && "do deletion after instantiation"); 5189 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 5190 return false; 5191 5192 // C++11 [expr.lambda.prim]p19: 5193 // The closure type associated with a lambda-expression has a 5194 // deleted (8.4.3) default constructor and a deleted copy 5195 // assignment operator. 5196 if (RD->isLambda() && 5197 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 5198 if (Diagnose) 5199 Diag(RD->getLocation(), diag::note_lambda_decl); 5200 return true; 5201 } 5202 5203 // For an anonymous struct or union, the copy and assignment special members 5204 // will never be used, so skip the check. For an anonymous union declared at 5205 // namespace scope, the constructor and destructor are used. 5206 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 5207 RD->isAnonymousStructOrUnion()) 5208 return false; 5209 5210 // C++11 [class.copy]p7, p18: 5211 // If the class definition declares a move constructor or move assignment 5212 // operator, an implicitly declared copy constructor or copy assignment 5213 // operator is defined as deleted. 5214 if (MD->isImplicit() && 5215 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 5216 CXXMethodDecl *UserDeclaredMove = 0; 5217 5218 // In Microsoft mode, a user-declared move only causes the deletion of the 5219 // corresponding copy operation, not both copy operations. 5220 if (RD->hasUserDeclaredMoveConstructor() && 5221 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 5222 if (!Diagnose) return true; 5223 5224 // Find any user-declared move constructor. 5225 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 5226 E = RD->ctor_end(); I != E; ++I) { 5227 if (I->isMoveConstructor()) { 5228 UserDeclaredMove = *I; 5229 break; 5230 } 5231 } 5232 assert(UserDeclaredMove); 5233 } else if (RD->hasUserDeclaredMoveAssignment() && 5234 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 5235 if (!Diagnose) return true; 5236 5237 // Find any user-declared move assignment operator. 5238 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 5239 E = RD->method_end(); I != E; ++I) { 5240 if (I->isMoveAssignmentOperator()) { 5241 UserDeclaredMove = *I; 5242 break; 5243 } 5244 } 5245 assert(UserDeclaredMove); 5246 } 5247 5248 if (UserDeclaredMove) { 5249 Diag(UserDeclaredMove->getLocation(), 5250 diag::note_deleted_copy_user_declared_move) 5251 << (CSM == CXXCopyAssignment) << RD 5252 << UserDeclaredMove->isMoveAssignmentOperator(); 5253 return true; 5254 } 5255 } 5256 5257 // Do access control from the special member function 5258 ContextRAII MethodContext(*this, MD); 5259 5260 // C++11 [class.dtor]p5: 5261 // -- for a virtual destructor, lookup of the non-array deallocation function 5262 // results in an ambiguity or in a function that is deleted or inaccessible 5263 if (CSM == CXXDestructor && MD->isVirtual()) { 5264 FunctionDecl *OperatorDelete = 0; 5265 DeclarationName Name = 5266 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5267 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5268 OperatorDelete, false)) { 5269 if (Diagnose) 5270 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5271 return true; 5272 } 5273 } 5274 5275 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5276 5277 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5278 BE = RD->bases_end(); BI != BE; ++BI) 5279 if (!BI->isVirtual() && 5280 SMI.shouldDeleteForBase(BI)) 5281 return true; 5282 5283 // Per DR1611, do not consider virtual bases of constructors of abstract 5284 // classes, since we are not going to construct them. 5285 if (!RD->isAbstract() || !SMI.IsConstructor) { 5286 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5287 BE = RD->vbases_end(); 5288 BI != BE; ++BI) 5289 if (SMI.shouldDeleteForBase(BI)) 5290 return true; 5291 } 5292 5293 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5294 FE = RD->field_end(); FI != FE; ++FI) 5295 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5296 SMI.shouldDeleteForField(*FI)) 5297 return true; 5298 5299 if (SMI.shouldDeleteForAllConstMembers()) 5300 return true; 5301 5302 return false; 5303 } 5304 5305 /// Perform lookup for a special member of the specified kind, and determine 5306 /// whether it is trivial. If the triviality can be determined without the 5307 /// lookup, skip it. This is intended for use when determining whether a 5308 /// special member of a containing object is trivial, and thus does not ever 5309 /// perform overload resolution for default constructors. 5310 /// 5311 /// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5312 /// member that was most likely to be intended to be trivial, if any. 5313 static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5314 Sema::CXXSpecialMember CSM, unsigned Quals, 5315 CXXMethodDecl **Selected) { 5316 if (Selected) 5317 *Selected = 0; 5318 5319 switch (CSM) { 5320 case Sema::CXXInvalid: 5321 llvm_unreachable("not a special member"); 5322 5323 case Sema::CXXDefaultConstructor: 5324 // C++11 [class.ctor]p5: 5325 // A default constructor is trivial if: 5326 // - all the [direct subobjects] have trivial default constructors 5327 // 5328 // Note, no overload resolution is performed in this case. 5329 if (RD->hasTrivialDefaultConstructor()) 5330 return true; 5331 5332 if (Selected) { 5333 // If there's a default constructor which could have been trivial, dig it 5334 // out. Otherwise, if there's any user-provided default constructor, point 5335 // to that as an example of why there's not a trivial one. 5336 CXXConstructorDecl *DefCtor = 0; 5337 if (RD->needsImplicitDefaultConstructor()) 5338 S.DeclareImplicitDefaultConstructor(RD); 5339 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5340 CE = RD->ctor_end(); CI != CE; ++CI) { 5341 if (!CI->isDefaultConstructor()) 5342 continue; 5343 DefCtor = *CI; 5344 if (!DefCtor->isUserProvided()) 5345 break; 5346 } 5347 5348 *Selected = DefCtor; 5349 } 5350 5351 return false; 5352 5353 case Sema::CXXDestructor: 5354 // C++11 [class.dtor]p5: 5355 // A destructor is trivial if: 5356 // - all the direct [subobjects] have trivial destructors 5357 if (RD->hasTrivialDestructor()) 5358 return true; 5359 5360 if (Selected) { 5361 if (RD->needsImplicitDestructor()) 5362 S.DeclareImplicitDestructor(RD); 5363 *Selected = RD->getDestructor(); 5364 } 5365 5366 return false; 5367 5368 case Sema::CXXCopyConstructor: 5369 // C++11 [class.copy]p12: 5370 // A copy constructor is trivial if: 5371 // - the constructor selected to copy each direct [subobject] is trivial 5372 if (RD->hasTrivialCopyConstructor()) { 5373 if (Quals == Qualifiers::Const) 5374 // We must either select the trivial copy constructor or reach an 5375 // ambiguity; no need to actually perform overload resolution. 5376 return true; 5377 } else if (!Selected) { 5378 return false; 5379 } 5380 // In C++98, we are not supposed to perform overload resolution here, but we 5381 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5382 // cases like B as having a non-trivial copy constructor: 5383 // struct A { template<typename T> A(T&); }; 5384 // struct B { mutable A a; }; 5385 goto NeedOverloadResolution; 5386 5387 case Sema::CXXCopyAssignment: 5388 // C++11 [class.copy]p25: 5389 // A copy assignment operator is trivial if: 5390 // - the assignment operator selected to copy each direct [subobject] is 5391 // trivial 5392 if (RD->hasTrivialCopyAssignment()) { 5393 if (Quals == Qualifiers::Const) 5394 return true; 5395 } else if (!Selected) { 5396 return false; 5397 } 5398 // In C++98, we are not supposed to perform overload resolution here, but we 5399 // treat that as a language defect. 5400 goto NeedOverloadResolution; 5401 5402 case Sema::CXXMoveConstructor: 5403 case Sema::CXXMoveAssignment: 5404 NeedOverloadResolution: 5405 Sema::SpecialMemberOverloadResult *SMOR = 5406 S.LookupSpecialMember(RD, CSM, 5407 Quals & Qualifiers::Const, 5408 Quals & Qualifiers::Volatile, 5409 /*RValueThis*/false, /*ConstThis*/false, 5410 /*VolatileThis*/false); 5411 5412 // The standard doesn't describe how to behave if the lookup is ambiguous. 5413 // We treat it as not making the member non-trivial, just like the standard 5414 // mandates for the default constructor. This should rarely matter, because 5415 // the member will also be deleted. 5416 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5417 return true; 5418 5419 if (!SMOR->getMethod()) { 5420 assert(SMOR->getKind() == 5421 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5422 return false; 5423 } 5424 5425 // We deliberately don't check if we found a deleted special member. We're 5426 // not supposed to! 5427 if (Selected) 5428 *Selected = SMOR->getMethod(); 5429 return SMOR->getMethod()->isTrivial(); 5430 } 5431 5432 llvm_unreachable("unknown special method kind"); 5433 } 5434 5435 static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5436 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5437 CI != CE; ++CI) 5438 if (!CI->isImplicit()) 5439 return *CI; 5440 5441 // Look for constructor templates. 5442 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5443 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5444 if (CXXConstructorDecl *CD = 5445 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5446 return CD; 5447 } 5448 5449 return 0; 5450 } 5451 5452 /// The kind of subobject we are checking for triviality. The values of this 5453 /// enumeration are used in diagnostics. 5454 enum TrivialSubobjectKind { 5455 /// The subobject is a base class. 5456 TSK_BaseClass, 5457 /// The subobject is a non-static data member. 5458 TSK_Field, 5459 /// The object is actually the complete object. 5460 TSK_CompleteObject 5461 }; 5462 5463 /// Check whether the special member selected for a given type would be trivial. 5464 static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5465 QualType SubType, 5466 Sema::CXXSpecialMember CSM, 5467 TrivialSubobjectKind Kind, 5468 bool Diagnose) { 5469 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5470 if (!SubRD) 5471 return true; 5472 5473 CXXMethodDecl *Selected; 5474 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5475 Diagnose ? &Selected : 0)) 5476 return true; 5477 5478 if (Diagnose) { 5479 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5480 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5481 << Kind << SubType.getUnqualifiedType(); 5482 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5483 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5484 } else if (!Selected) 5485 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5486 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5487 else if (Selected->isUserProvided()) { 5488 if (Kind == TSK_CompleteObject) 5489 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5490 << Kind << SubType.getUnqualifiedType() << CSM; 5491 else { 5492 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5493 << Kind << SubType.getUnqualifiedType() << CSM; 5494 S.Diag(Selected->getLocation(), diag::note_declared_at); 5495 } 5496 } else { 5497 if (Kind != TSK_CompleteObject) 5498 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5499 << Kind << SubType.getUnqualifiedType() << CSM; 5500 5501 // Explain why the defaulted or deleted special member isn't trivial. 5502 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5503 } 5504 } 5505 5506 return false; 5507 } 5508 5509 /// Check whether the members of a class type allow a special member to be 5510 /// trivial. 5511 static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5512 Sema::CXXSpecialMember CSM, 5513 bool ConstArg, bool Diagnose) { 5514 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5515 FE = RD->field_end(); FI != FE; ++FI) { 5516 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5517 continue; 5518 5519 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5520 5521 // Pretend anonymous struct or union members are members of this class. 5522 if (FI->isAnonymousStructOrUnion()) { 5523 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5524 CSM, ConstArg, Diagnose)) 5525 return false; 5526 continue; 5527 } 5528 5529 // C++11 [class.ctor]p5: 5530 // A default constructor is trivial if [...] 5531 // -- no non-static data member of its class has a 5532 // brace-or-equal-initializer 5533 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5534 if (Diagnose) 5535 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5536 return false; 5537 } 5538 5539 // Objective C ARC 4.3.5: 5540 // [...] nontrivally ownership-qualified types are [...] not trivially 5541 // default constructible, copy constructible, move constructible, copy 5542 // assignable, move assignable, or destructible [...] 5543 if (S.getLangOpts().ObjCAutoRefCount && 5544 FieldType.hasNonTrivialObjCLifetime()) { 5545 if (Diagnose) 5546 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5547 << RD << FieldType.getObjCLifetime(); 5548 return false; 5549 } 5550 5551 if (ConstArg && !FI->isMutable()) 5552 FieldType.addConst(); 5553 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5554 TSK_Field, Diagnose)) 5555 return false; 5556 } 5557 5558 return true; 5559 } 5560 5561 /// Diagnose why the specified class does not have a trivial special member of 5562 /// the given kind. 5563 void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5564 QualType Ty = Context.getRecordType(RD); 5565 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5566 Ty.addConst(); 5567 5568 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5569 TSK_CompleteObject, /*Diagnose*/true); 5570 } 5571 5572 /// Determine whether a defaulted or deleted special member function is trivial, 5573 /// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5574 /// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5575 bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5576 bool Diagnose) { 5577 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5578 5579 CXXRecordDecl *RD = MD->getParent(); 5580 5581 bool ConstArg = false; 5582 5583 // C++11 [class.copy]p12, p25: [DR1593] 5584 // A [special member] is trivial if [...] its parameter-type-list is 5585 // equivalent to the parameter-type-list of an implicit declaration [...] 5586 switch (CSM) { 5587 case CXXDefaultConstructor: 5588 case CXXDestructor: 5589 // Trivial default constructors and destructors cannot have parameters. 5590 break; 5591 5592 case CXXCopyConstructor: 5593 case CXXCopyAssignment: { 5594 // Trivial copy operations always have const, non-volatile parameter types. 5595 ConstArg = true; 5596 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5597 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5598 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5599 if (Diagnose) 5600 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5601 << Param0->getSourceRange() << Param0->getType() 5602 << Context.getLValueReferenceType( 5603 Context.getRecordType(RD).withConst()); 5604 return false; 5605 } 5606 break; 5607 } 5608 5609 case CXXMoveConstructor: 5610 case CXXMoveAssignment: { 5611 // Trivial move operations always have non-cv-qualified parameters. 5612 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5613 const RValueReferenceType *RT = 5614 Param0->getType()->getAs<RValueReferenceType>(); 5615 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5616 if (Diagnose) 5617 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5618 << Param0->getSourceRange() << Param0->getType() 5619 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5620 return false; 5621 } 5622 break; 5623 } 5624 5625 case CXXInvalid: 5626 llvm_unreachable("not a special member"); 5627 } 5628 5629 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5630 if (Diagnose) 5631 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5632 diag::note_nontrivial_default_arg) 5633 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5634 return false; 5635 } 5636 if (MD->isVariadic()) { 5637 if (Diagnose) 5638 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5639 return false; 5640 } 5641 5642 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5643 // A copy/move [constructor or assignment operator] is trivial if 5644 // -- the [member] selected to copy/move each direct base class subobject 5645 // is trivial 5646 // 5647 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5648 // A [default constructor or destructor] is trivial if 5649 // -- all the direct base classes have trivial [default constructors or 5650 // destructors] 5651 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5652 BE = RD->bases_end(); BI != BE; ++BI) 5653 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5654 ConstArg ? BI->getType().withConst() 5655 : BI->getType(), 5656 CSM, TSK_BaseClass, Diagnose)) 5657 return false; 5658 5659 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5660 // A copy/move [constructor or assignment operator] for a class X is 5661 // trivial if 5662 // -- for each non-static data member of X that is of class type (or array 5663 // thereof), the constructor selected to copy/move that member is 5664 // trivial 5665 // 5666 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5667 // A [default constructor or destructor] is trivial if 5668 // -- for all of the non-static data members of its class that are of class 5669 // type (or array thereof), each such class has a trivial [default 5670 // constructor or destructor] 5671 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5672 return false; 5673 5674 // C++11 [class.dtor]p5: 5675 // A destructor is trivial if [...] 5676 // -- the destructor is not virtual 5677 if (CSM == CXXDestructor && MD->isVirtual()) { 5678 if (Diagnose) 5679 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5680 return false; 5681 } 5682 5683 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5684 // A [special member] for class X is trivial if [...] 5685 // -- class X has no virtual functions and no virtual base classes 5686 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5687 if (!Diagnose) 5688 return false; 5689 5690 if (RD->getNumVBases()) { 5691 // Check for virtual bases. We already know that the corresponding 5692 // member in all bases is trivial, so vbases must all be direct. 5693 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5694 assert(BS.isVirtual()); 5695 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5696 return false; 5697 } 5698 5699 // Must have a virtual method. 5700 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5701 ME = RD->method_end(); MI != ME; ++MI) { 5702 if (MI->isVirtual()) { 5703 SourceLocation MLoc = MI->getLocStart(); 5704 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5705 return false; 5706 } 5707 } 5708 5709 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5710 } 5711 5712 // Looks like it's trivial! 5713 return true; 5714 } 5715 5716 /// \brief Data used with FindHiddenVirtualMethod 5717 namespace { 5718 struct FindHiddenVirtualMethodData { 5719 Sema *S; 5720 CXXMethodDecl *Method; 5721 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5722 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5723 }; 5724 } 5725 5726 /// \brief Check whether any most overriden method from MD in Methods 5727 static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5728 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5729 if (MD->size_overridden_methods() == 0) 5730 return Methods.count(MD->getCanonicalDecl()); 5731 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5732 E = MD->end_overridden_methods(); 5733 I != E; ++I) 5734 if (CheckMostOverridenMethods(*I, Methods)) 5735 return true; 5736 return false; 5737 } 5738 5739 /// \brief Member lookup function that determines whether a given C++ 5740 /// method overloads virtual methods in a base class without overriding any, 5741 /// to be used with CXXRecordDecl::lookupInBases(). 5742 static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5743 CXXBasePath &Path, 5744 void *UserData) { 5745 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5746 5747 FindHiddenVirtualMethodData &Data 5748 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5749 5750 DeclarationName Name = Data.Method->getDeclName(); 5751 assert(Name.getNameKind() == DeclarationName::Identifier); 5752 5753 bool foundSameNameMethod = false; 5754 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5755 for (Path.Decls = BaseRecord->lookup(Name); 5756 !Path.Decls.empty(); 5757 Path.Decls = Path.Decls.slice(1)) { 5758 NamedDecl *D = Path.Decls.front(); 5759 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5760 MD = MD->getCanonicalDecl(); 5761 foundSameNameMethod = true; 5762 // Interested only in hidden virtual methods. 5763 if (!MD->isVirtual()) 5764 continue; 5765 // If the method we are checking overrides a method from its base 5766 // don't warn about the other overloaded methods. 5767 if (!Data.S->IsOverload(Data.Method, MD, false)) 5768 return true; 5769 // Collect the overload only if its hidden. 5770 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5771 overloadedMethods.push_back(MD); 5772 } 5773 } 5774 5775 if (foundSameNameMethod) 5776 Data.OverloadedMethods.append(overloadedMethods.begin(), 5777 overloadedMethods.end()); 5778 return foundSameNameMethod; 5779 } 5780 5781 /// \brief Add the most overriden methods from MD to Methods 5782 static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5783 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5784 if (MD->size_overridden_methods() == 0) 5785 Methods.insert(MD->getCanonicalDecl()); 5786 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5787 E = MD->end_overridden_methods(); 5788 I != E; ++I) 5789 AddMostOverridenMethods(*I, Methods); 5790 } 5791 5792 /// \brief Check if a method overloads virtual methods in a base class without 5793 /// overriding any. 5794 void Sema::FindHiddenVirtualMethods(CXXMethodDecl *MD, 5795 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5796 if (!MD->getDeclName().isIdentifier()) 5797 return; 5798 5799 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5800 /*bool RecordPaths=*/false, 5801 /*bool DetectVirtual=*/false); 5802 FindHiddenVirtualMethodData Data; 5803 Data.Method = MD; 5804 Data.S = this; 5805 5806 // Keep the base methods that were overriden or introduced in the subclass 5807 // by 'using' in a set. A base method not in this set is hidden. 5808 CXXRecordDecl *DC = MD->getParent(); 5809 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5810 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5811 NamedDecl *ND = *I; 5812 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5813 ND = shad->getTargetDecl(); 5814 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5815 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5816 } 5817 5818 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths)) 5819 OverloadedMethods = Data.OverloadedMethods; 5820 } 5821 5822 void Sema::NoteHiddenVirtualMethods(CXXMethodDecl *MD, 5823 SmallVectorImpl<CXXMethodDecl*> &OverloadedMethods) { 5824 for (unsigned i = 0, e = OverloadedMethods.size(); i != e; ++i) { 5825 CXXMethodDecl *overloadedMD = OverloadedMethods[i]; 5826 PartialDiagnostic PD = PDiag( 5827 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5828 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5829 Diag(overloadedMD->getLocation(), PD); 5830 } 5831 } 5832 5833 /// \brief Diagnose methods which overload virtual methods in a base class 5834 /// without overriding any. 5835 void Sema::DiagnoseHiddenVirtualMethods(CXXMethodDecl *MD) { 5836 if (MD->isInvalidDecl()) 5837 return; 5838 5839 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5840 MD->getLocation()) == DiagnosticsEngine::Ignored) 5841 return; 5842 5843 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5844 FindHiddenVirtualMethods(MD, OverloadedMethods); 5845 if (!OverloadedMethods.empty()) { 5846 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5847 << MD << (OverloadedMethods.size() > 1); 5848 5849 NoteHiddenVirtualMethods(MD, OverloadedMethods); 5850 } 5851 } 5852 5853 void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5854 Decl *TagDecl, 5855 SourceLocation LBrac, 5856 SourceLocation RBrac, 5857 AttributeList *AttrList) { 5858 if (!TagDecl) 5859 return; 5860 5861 AdjustDeclIfTemplate(TagDecl); 5862 5863 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5864 if (l->getKind() != AttributeList::AT_Visibility) 5865 continue; 5866 l->setInvalid(); 5867 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5868 l->getName(); 5869 } 5870 5871 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5872 // strict aliasing violation! 5873 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5874 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5875 5876 CheckCompletedCXXClass( 5877 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5878 } 5879 5880 /// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5881 /// special functions, such as the default constructor, copy 5882 /// constructor, or destructor, to the given C++ class (C++ 5883 /// [special]p1). This routine can only be executed just before the 5884 /// definition of the class is complete. 5885 void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5886 if (!ClassDecl->hasUserDeclaredConstructor()) 5887 ++ASTContext::NumImplicitDefaultConstructors; 5888 5889 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5890 ++ASTContext::NumImplicitCopyConstructors; 5891 5892 // If the properties or semantics of the copy constructor couldn't be 5893 // determined while the class was being declared, force a declaration 5894 // of it now. 5895 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5896 DeclareImplicitCopyConstructor(ClassDecl); 5897 } 5898 5899 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5900 ++ASTContext::NumImplicitMoveConstructors; 5901 5902 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5903 DeclareImplicitMoveConstructor(ClassDecl); 5904 } 5905 5906 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5907 ++ASTContext::NumImplicitCopyAssignmentOperators; 5908 5909 // If we have a dynamic class, then the copy assignment operator may be 5910 // virtual, so we have to declare it immediately. This ensures that, e.g., 5911 // it shows up in the right place in the vtable and that we diagnose 5912 // problems with the implicit exception specification. 5913 if (ClassDecl->isDynamicClass() || 5914 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5915 DeclareImplicitCopyAssignment(ClassDecl); 5916 } 5917 5918 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5919 ++ASTContext::NumImplicitMoveAssignmentOperators; 5920 5921 // Likewise for the move assignment operator. 5922 if (ClassDecl->isDynamicClass() || 5923 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5924 DeclareImplicitMoveAssignment(ClassDecl); 5925 } 5926 5927 if (!ClassDecl->hasUserDeclaredDestructor()) { 5928 ++ASTContext::NumImplicitDestructors; 5929 5930 // If we have a dynamic class, then the destructor may be virtual, so we 5931 // have to declare the destructor immediately. This ensures that, e.g., it 5932 // shows up in the right place in the vtable and that we diagnose problems 5933 // with the implicit exception specification. 5934 if (ClassDecl->isDynamicClass() || 5935 ClassDecl->needsOverloadResolutionForDestructor()) 5936 DeclareImplicitDestructor(ClassDecl); 5937 } 5938 } 5939 5940 void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5941 if (!D) 5942 return; 5943 5944 int NumParamList = D->getNumTemplateParameterLists(); 5945 for (int i = 0; i < NumParamList; i++) { 5946 TemplateParameterList* Params = D->getTemplateParameterList(i); 5947 for (TemplateParameterList::iterator Param = Params->begin(), 5948 ParamEnd = Params->end(); 5949 Param != ParamEnd; ++Param) { 5950 NamedDecl *Named = cast<NamedDecl>(*Param); 5951 if (Named->getDeclName()) { 5952 S->AddDecl(Named); 5953 IdResolver.AddDecl(Named); 5954 } 5955 } 5956 } 5957 } 5958 5959 void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5960 if (!D) 5961 return; 5962 5963 TemplateParameterList *Params = 0; 5964 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5965 Params = Template->getTemplateParameters(); 5966 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5967 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5968 Params = PartialSpec->getTemplateParameters(); 5969 else 5970 return; 5971 5972 for (TemplateParameterList::iterator Param = Params->begin(), 5973 ParamEnd = Params->end(); 5974 Param != ParamEnd; ++Param) { 5975 NamedDecl *Named = cast<NamedDecl>(*Param); 5976 if (Named->getDeclName()) { 5977 S->AddDecl(Named); 5978 IdResolver.AddDecl(Named); 5979 } 5980 } 5981 } 5982 5983 void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5984 if (!RecordD) return; 5985 AdjustDeclIfTemplate(RecordD); 5986 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5987 PushDeclContext(S, Record); 5988 } 5989 5990 void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5991 if (!RecordD) return; 5992 PopDeclContext(); 5993 } 5994 5995 /// ActOnStartDelayedCXXMethodDeclaration - We have completed 5996 /// parsing a top-level (non-nested) C++ class, and we are now 5997 /// parsing those parts of the given Method declaration that could 5998 /// not be parsed earlier (C++ [class.mem]p2), such as default 5999 /// arguments. This action should enter the scope of the given 6000 /// Method declaration as if we had just parsed the qualified method 6001 /// name. However, it should not bring the parameters into scope; 6002 /// that will be performed by ActOnDelayedCXXMethodParameter. 6003 void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 6004 } 6005 6006 /// ActOnDelayedCXXMethodParameter - We've already started a delayed 6007 /// C++ method declaration. We're (re-)introducing the given 6008 /// function parameter into scope for use in parsing later parts of 6009 /// the method declaration. For example, we could see an 6010 /// ActOnParamDefaultArgument event for this parameter. 6011 void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 6012 if (!ParamD) 6013 return; 6014 6015 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 6016 6017 // If this parameter has an unparsed default argument, clear it out 6018 // to make way for the parsed default argument. 6019 if (Param->hasUnparsedDefaultArg()) 6020 Param->setDefaultArg(0); 6021 6022 S->AddDecl(Param); 6023 if (Param->getDeclName()) 6024 IdResolver.AddDecl(Param); 6025 } 6026 6027 /// ActOnFinishDelayedCXXMethodDeclaration - We have finished 6028 /// processing the delayed method declaration for Method. The method 6029 /// declaration is now considered finished. There may be a separate 6030 /// ActOnStartOfFunctionDef action later (not necessarily 6031 /// immediately!) for this method, if it was also defined inside the 6032 /// class body. 6033 void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 6034 if (!MethodD) 6035 return; 6036 6037 AdjustDeclIfTemplate(MethodD); 6038 6039 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 6040 6041 // Now that we have our default arguments, check the constructor 6042 // again. It could produce additional diagnostics or affect whether 6043 // the class has implicitly-declared destructors, among other 6044 // things. 6045 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 6046 CheckConstructor(Constructor); 6047 6048 // Check the default arguments, which we may have added. 6049 if (!Method->isInvalidDecl()) 6050 CheckCXXDefaultArguments(Method); 6051 } 6052 6053 /// CheckConstructorDeclarator - Called by ActOnDeclarator to check 6054 /// the well-formedness of the constructor declarator @p D with type @p 6055 /// R. If there are any errors in the declarator, this routine will 6056 /// emit diagnostics and set the invalid bit to true. In any case, the type 6057 /// will be updated to reflect a well-formed type for the constructor and 6058 /// returned. 6059 QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 6060 StorageClass &SC) { 6061 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 6062 6063 // C++ [class.ctor]p3: 6064 // A constructor shall not be virtual (10.3) or static (9.4). A 6065 // constructor can be invoked for a const, volatile or const 6066 // volatile object. A constructor shall not be declared const, 6067 // volatile, or const volatile (9.3.2). 6068 if (isVirtual) { 6069 if (!D.isInvalidType()) 6070 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 6071 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 6072 << SourceRange(D.getIdentifierLoc()); 6073 D.setInvalidType(); 6074 } 6075 if (SC == SC_Static) { 6076 if (!D.isInvalidType()) 6077 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 6078 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6079 << SourceRange(D.getIdentifierLoc()); 6080 D.setInvalidType(); 6081 SC = SC_None; 6082 } 6083 6084 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6085 if (FTI.TypeQuals != 0) { 6086 if (FTI.TypeQuals & Qualifiers::Const) 6087 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6088 << "const" << SourceRange(D.getIdentifierLoc()); 6089 if (FTI.TypeQuals & Qualifiers::Volatile) 6090 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6091 << "volatile" << SourceRange(D.getIdentifierLoc()); 6092 if (FTI.TypeQuals & Qualifiers::Restrict) 6093 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 6094 << "restrict" << SourceRange(D.getIdentifierLoc()); 6095 D.setInvalidType(); 6096 } 6097 6098 // C++0x [class.ctor]p4: 6099 // A constructor shall not be declared with a ref-qualifier. 6100 if (FTI.hasRefQualifier()) { 6101 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 6102 << FTI.RefQualifierIsLValueRef 6103 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6104 D.setInvalidType(); 6105 } 6106 6107 // Rebuild the function type "R" without any type qualifiers (in 6108 // case any of the errors above fired) and with "void" as the 6109 // return type, since constructors don't have return types. 6110 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6111 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 6112 return R; 6113 6114 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6115 EPI.TypeQuals = 0; 6116 EPI.RefQualifier = RQ_None; 6117 6118 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 6119 } 6120 6121 /// CheckConstructor - Checks a fully-formed constructor for 6122 /// well-formedness, issuing any diagnostics required. Returns true if 6123 /// the constructor declarator is invalid. 6124 void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 6125 CXXRecordDecl *ClassDecl 6126 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 6127 if (!ClassDecl) 6128 return Constructor->setInvalidDecl(); 6129 6130 // C++ [class.copy]p3: 6131 // A declaration of a constructor for a class X is ill-formed if 6132 // its first parameter is of type (optionally cv-qualified) X and 6133 // either there are no other parameters or else all other 6134 // parameters have default arguments. 6135 if (!Constructor->isInvalidDecl() && 6136 ((Constructor->getNumParams() == 1) || 6137 (Constructor->getNumParams() > 1 && 6138 Constructor->getParamDecl(1)->hasDefaultArg())) && 6139 Constructor->getTemplateSpecializationKind() 6140 != TSK_ImplicitInstantiation) { 6141 QualType ParamType = Constructor->getParamDecl(0)->getType(); 6142 QualType ClassTy = Context.getTagDeclType(ClassDecl); 6143 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 6144 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 6145 const char *ConstRef 6146 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 6147 : " const &"; 6148 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 6149 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 6150 6151 // FIXME: Rather that making the constructor invalid, we should endeavor 6152 // to fix the type. 6153 Constructor->setInvalidDecl(); 6154 } 6155 } 6156 } 6157 6158 /// CheckDestructor - Checks a fully-formed destructor definition for 6159 /// well-formedness, issuing any diagnostics required. Returns true 6160 /// on error. 6161 bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 6162 CXXRecordDecl *RD = Destructor->getParent(); 6163 6164 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 6165 SourceLocation Loc; 6166 6167 if (!Destructor->isImplicit()) 6168 Loc = Destructor->getLocation(); 6169 else 6170 Loc = RD->getLocation(); 6171 6172 // If we have a virtual destructor, look up the deallocation function 6173 FunctionDecl *OperatorDelete = 0; 6174 DeclarationName Name = 6175 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 6176 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 6177 return true; 6178 6179 MarkFunctionReferenced(Loc, OperatorDelete); 6180 6181 Destructor->setOperatorDelete(OperatorDelete); 6182 } 6183 6184 return false; 6185 } 6186 6187 static inline bool 6188 FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 6189 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 6190 FTI.ArgInfo[0].Param && 6191 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 6192 } 6193 6194 /// CheckDestructorDeclarator - Called by ActOnDeclarator to check 6195 /// the well-formednes of the destructor declarator @p D with type @p 6196 /// R. If there are any errors in the declarator, this routine will 6197 /// emit diagnostics and set the declarator to invalid. Even if this happens, 6198 /// will be updated to reflect a well-formed type for the destructor and 6199 /// returned. 6200 QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 6201 StorageClass& SC) { 6202 // C++ [class.dtor]p1: 6203 // [...] A typedef-name that names a class is a class-name 6204 // (7.1.3); however, a typedef-name that names a class shall not 6205 // be used as the identifier in the declarator for a destructor 6206 // declaration. 6207 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 6208 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 6209 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6210 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 6211 else if (const TemplateSpecializationType *TST = 6212 DeclaratorType->getAs<TemplateSpecializationType>()) 6213 if (TST->isTypeAlias()) 6214 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 6215 << DeclaratorType << 1; 6216 6217 // C++ [class.dtor]p2: 6218 // A destructor is used to destroy objects of its class type. A 6219 // destructor takes no parameters, and no return type can be 6220 // specified for it (not even void). The address of a destructor 6221 // shall not be taken. A destructor shall not be static. A 6222 // destructor can be invoked for a const, volatile or const 6223 // volatile object. A destructor shall not be declared const, 6224 // volatile or const volatile (9.3.2). 6225 if (SC == SC_Static) { 6226 if (!D.isInvalidType()) 6227 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 6228 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6229 << SourceRange(D.getIdentifierLoc()) 6230 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 6231 6232 SC = SC_None; 6233 } 6234 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6235 // Destructors don't have return types, but the parser will 6236 // happily parse something like: 6237 // 6238 // class X { 6239 // float ~X(); 6240 // }; 6241 // 6242 // The return type will be eliminated later. 6243 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 6244 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6245 << SourceRange(D.getIdentifierLoc()); 6246 } 6247 6248 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6249 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 6250 if (FTI.TypeQuals & Qualifiers::Const) 6251 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6252 << "const" << SourceRange(D.getIdentifierLoc()); 6253 if (FTI.TypeQuals & Qualifiers::Volatile) 6254 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6255 << "volatile" << SourceRange(D.getIdentifierLoc()); 6256 if (FTI.TypeQuals & Qualifiers::Restrict) 6257 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 6258 << "restrict" << SourceRange(D.getIdentifierLoc()); 6259 D.setInvalidType(); 6260 } 6261 6262 // C++0x [class.dtor]p2: 6263 // A destructor shall not be declared with a ref-qualifier. 6264 if (FTI.hasRefQualifier()) { 6265 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 6266 << FTI.RefQualifierIsLValueRef 6267 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 6268 D.setInvalidType(); 6269 } 6270 6271 // Make sure we don't have any parameters. 6272 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 6273 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6274 6275 // Delete the parameters. 6276 FTI.freeArgs(); 6277 D.setInvalidType(); 6278 } 6279 6280 // Make sure the destructor isn't variadic. 6281 if (FTI.isVariadic) { 6282 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6283 D.setInvalidType(); 6284 } 6285 6286 // Rebuild the function type "R" without any type qualifiers or 6287 // parameters (in case any of the errors above fired) and with 6288 // "void" as the return type, since destructors don't have return 6289 // types. 6290 if (!D.isInvalidType()) 6291 return R; 6292 6293 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6294 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6295 EPI.Variadic = false; 6296 EPI.TypeQuals = 0; 6297 EPI.RefQualifier = RQ_None; 6298 return Context.getFunctionType(Context.VoidTy, None, EPI); 6299 } 6300 6301 /// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6302 /// well-formednes of the conversion function declarator @p D with 6303 /// type @p R. If there are any errors in the declarator, this routine 6304 /// will emit diagnostics and return true. Otherwise, it will return 6305 /// false. Either way, the type @p R will be updated to reflect a 6306 /// well-formed type for the conversion operator. 6307 void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6308 StorageClass& SC) { 6309 // C++ [class.conv.fct]p1: 6310 // Neither parameter types nor return type can be specified. The 6311 // type of a conversion function (8.3.5) is "function taking no 6312 // parameter returning conversion-type-id." 6313 if (SC == SC_Static) { 6314 if (!D.isInvalidType()) 6315 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6316 << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6317 << D.getName().getSourceRange(); 6318 D.setInvalidType(); 6319 SC = SC_None; 6320 } 6321 6322 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6323 6324 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6325 // Conversion functions don't have return types, but the parser will 6326 // happily parse something like: 6327 // 6328 // class X { 6329 // float operator bool(); 6330 // }; 6331 // 6332 // The return type will be changed later anyway. 6333 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6334 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6335 << SourceRange(D.getIdentifierLoc()); 6336 D.setInvalidType(); 6337 } 6338 6339 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6340 6341 // Make sure we don't have any parameters. 6342 if (Proto->getNumArgs() > 0) { 6343 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6344 6345 // Delete the parameters. 6346 D.getFunctionTypeInfo().freeArgs(); 6347 D.setInvalidType(); 6348 } else if (Proto->isVariadic()) { 6349 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6350 D.setInvalidType(); 6351 } 6352 6353 // Diagnose "&operator bool()" and other such nonsense. This 6354 // is actually a gcc extension which we don't support. 6355 if (Proto->getResultType() != ConvType) { 6356 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6357 << Proto->getResultType(); 6358 D.setInvalidType(); 6359 ConvType = Proto->getResultType(); 6360 } 6361 6362 // C++ [class.conv.fct]p4: 6363 // The conversion-type-id shall not represent a function type nor 6364 // an array type. 6365 if (ConvType->isArrayType()) { 6366 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6367 ConvType = Context.getPointerType(ConvType); 6368 D.setInvalidType(); 6369 } else if (ConvType->isFunctionType()) { 6370 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6371 ConvType = Context.getPointerType(ConvType); 6372 D.setInvalidType(); 6373 } 6374 6375 // Rebuild the function type "R" without any parameters (in case any 6376 // of the errors above fired) and with the conversion type as the 6377 // return type. 6378 if (D.isInvalidType()) 6379 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6380 6381 // C++0x explicit conversion operators. 6382 if (D.getDeclSpec().isExplicitSpecified()) 6383 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6384 getLangOpts().CPlusPlus11 ? 6385 diag::warn_cxx98_compat_explicit_conversion_functions : 6386 diag::ext_explicit_conversion_functions) 6387 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6388 } 6389 6390 /// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6391 /// the declaration of the given C++ conversion function. This routine 6392 /// is responsible for recording the conversion function in the C++ 6393 /// class, if possible. 6394 Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6395 assert(Conversion && "Expected to receive a conversion function declaration"); 6396 6397 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6398 6399 // Make sure we aren't redeclaring the conversion function. 6400 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6401 6402 // C++ [class.conv.fct]p1: 6403 // [...] A conversion function is never used to convert a 6404 // (possibly cv-qualified) object to the (possibly cv-qualified) 6405 // same object type (or a reference to it), to a (possibly 6406 // cv-qualified) base class of that type (or a reference to it), 6407 // or to (possibly cv-qualified) void. 6408 // FIXME: Suppress this warning if the conversion function ends up being a 6409 // virtual function that overrides a virtual function in a base class. 6410 QualType ClassType 6411 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6412 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6413 ConvType = ConvTypeRef->getPointeeType(); 6414 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6415 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6416 /* Suppress diagnostics for instantiations. */; 6417 else if (ConvType->isRecordType()) { 6418 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6419 if (ConvType == ClassType) 6420 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6421 << ClassType; 6422 else if (IsDerivedFrom(ClassType, ConvType)) 6423 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6424 << ClassType << ConvType; 6425 } else if (ConvType->isVoidType()) { 6426 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6427 << ClassType << ConvType; 6428 } 6429 6430 if (FunctionTemplateDecl *ConversionTemplate 6431 = Conversion->getDescribedFunctionTemplate()) 6432 return ConversionTemplate; 6433 6434 return Conversion; 6435 } 6436 6437 //===----------------------------------------------------------------------===// 6438 // Namespace Handling 6439 //===----------------------------------------------------------------------===// 6440 6441 /// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6442 /// reopened. 6443 static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6444 SourceLocation Loc, 6445 IdentifierInfo *II, bool *IsInline, 6446 NamespaceDecl *PrevNS) { 6447 assert(*IsInline != PrevNS->isInline()); 6448 6449 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6450 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6451 // inline namespaces, with the intention of bringing names into namespace std. 6452 // 6453 // We support this just well enough to get that case working; this is not 6454 // sufficient to support reopening namespaces as inline in general. 6455 if (*IsInline && II && II->getName().startswith("__atomic") && 6456 S.getSourceManager().isInSystemHeader(Loc)) { 6457 // Mark all prior declarations of the namespace as inline. 6458 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6459 NS = NS->getPreviousDecl()) 6460 NS->setInline(*IsInline); 6461 // Patch up the lookup table for the containing namespace. This isn't really 6462 // correct, but it's good enough for this particular case. 6463 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6464 E = PrevNS->decls_end(); I != E; ++I) 6465 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6466 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6467 return; 6468 } 6469 6470 if (PrevNS->isInline()) 6471 // The user probably just forgot the 'inline', so suggest that it 6472 // be added back. 6473 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6474 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6475 else 6476 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6477 << IsInline; 6478 6479 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6480 *IsInline = PrevNS->isInline(); 6481 } 6482 6483 /// ActOnStartNamespaceDef - This is called at the start of a namespace 6484 /// definition. 6485 Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6486 SourceLocation InlineLoc, 6487 SourceLocation NamespaceLoc, 6488 SourceLocation IdentLoc, 6489 IdentifierInfo *II, 6490 SourceLocation LBrace, 6491 AttributeList *AttrList) { 6492 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6493 // For anonymous namespace, take the location of the left brace. 6494 SourceLocation Loc = II ? IdentLoc : LBrace; 6495 bool IsInline = InlineLoc.isValid(); 6496 bool IsInvalid = false; 6497 bool IsStd = false; 6498 bool AddToKnown = false; 6499 Scope *DeclRegionScope = NamespcScope->getParent(); 6500 6501 NamespaceDecl *PrevNS = 0; 6502 if (II) { 6503 // C++ [namespace.def]p2: 6504 // The identifier in an original-namespace-definition shall not 6505 // have been previously defined in the declarative region in 6506 // which the original-namespace-definition appears. The 6507 // identifier in an original-namespace-definition is the name of 6508 // the namespace. Subsequently in that declarative region, it is 6509 // treated as an original-namespace-name. 6510 // 6511 // Since namespace names are unique in their scope, and we don't 6512 // look through using directives, just look for any ordinary names. 6513 6514 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6515 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6516 Decl::IDNS_Namespace; 6517 NamedDecl *PrevDecl = 0; 6518 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6519 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6520 ++I) { 6521 if ((*I)->getIdentifierNamespace() & IDNS) { 6522 PrevDecl = *I; 6523 break; 6524 } 6525 } 6526 6527 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6528 6529 if (PrevNS) { 6530 // This is an extended namespace definition. 6531 if (IsInline != PrevNS->isInline()) 6532 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6533 &IsInline, PrevNS); 6534 } else if (PrevDecl) { 6535 // This is an invalid name redefinition. 6536 Diag(Loc, diag::err_redefinition_different_kind) 6537 << II; 6538 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6539 IsInvalid = true; 6540 // Continue on to push Namespc as current DeclContext and return it. 6541 } else if (II->isStr("std") && 6542 CurContext->getRedeclContext()->isTranslationUnit()) { 6543 // This is the first "real" definition of the namespace "std", so update 6544 // our cache of the "std" namespace to point at this definition. 6545 PrevNS = getStdNamespace(); 6546 IsStd = true; 6547 AddToKnown = !IsInline; 6548 } else { 6549 // We've seen this namespace for the first time. 6550 AddToKnown = !IsInline; 6551 } 6552 } else { 6553 // Anonymous namespaces. 6554 6555 // Determine whether the parent already has an anonymous namespace. 6556 DeclContext *Parent = CurContext->getRedeclContext(); 6557 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6558 PrevNS = TU->getAnonymousNamespace(); 6559 } else { 6560 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6561 PrevNS = ND->getAnonymousNamespace(); 6562 } 6563 6564 if (PrevNS && IsInline != PrevNS->isInline()) 6565 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6566 &IsInline, PrevNS); 6567 } 6568 6569 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6570 StartLoc, Loc, II, PrevNS); 6571 if (IsInvalid) 6572 Namespc->setInvalidDecl(); 6573 6574 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6575 6576 // FIXME: Should we be merging attributes? 6577 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6578 PushNamespaceVisibilityAttr(Attr, Loc); 6579 6580 if (IsStd) 6581 StdNamespace = Namespc; 6582 if (AddToKnown) 6583 KnownNamespaces[Namespc] = false; 6584 6585 if (II) { 6586 PushOnScopeChains(Namespc, DeclRegionScope); 6587 } else { 6588 // Link the anonymous namespace into its parent. 6589 DeclContext *Parent = CurContext->getRedeclContext(); 6590 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6591 TU->setAnonymousNamespace(Namespc); 6592 } else { 6593 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6594 } 6595 6596 CurContext->addDecl(Namespc); 6597 6598 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6599 // behaves as if it were replaced by 6600 // namespace unique { /* empty body */ } 6601 // using namespace unique; 6602 // namespace unique { namespace-body } 6603 // where all occurrences of 'unique' in a translation unit are 6604 // replaced by the same identifier and this identifier differs 6605 // from all other identifiers in the entire program. 6606 6607 // We just create the namespace with an empty name and then add an 6608 // implicit using declaration, just like the standard suggests. 6609 // 6610 // CodeGen enforces the "universally unique" aspect by giving all 6611 // declarations semantically contained within an anonymous 6612 // namespace internal linkage. 6613 6614 if (!PrevNS) { 6615 UsingDirectiveDecl* UD 6616 = UsingDirectiveDecl::Create(Context, Parent, 6617 /* 'using' */ LBrace, 6618 /* 'namespace' */ SourceLocation(), 6619 /* qualifier */ NestedNameSpecifierLoc(), 6620 /* identifier */ SourceLocation(), 6621 Namespc, 6622 /* Ancestor */ Parent); 6623 UD->setImplicit(); 6624 Parent->addDecl(UD); 6625 } 6626 } 6627 6628 ActOnDocumentableDecl(Namespc); 6629 6630 // Although we could have an invalid decl (i.e. the namespace name is a 6631 // redefinition), push it as current DeclContext and try to continue parsing. 6632 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6633 // for the namespace has the declarations that showed up in that particular 6634 // namespace definition. 6635 PushDeclContext(NamespcScope, Namespc); 6636 return Namespc; 6637 } 6638 6639 /// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6640 /// is a namespace alias, returns the namespace it points to. 6641 static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6642 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6643 return AD->getNamespace(); 6644 return dyn_cast_or_null<NamespaceDecl>(D); 6645 } 6646 6647 /// ActOnFinishNamespaceDef - This callback is called after a namespace is 6648 /// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6649 void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6650 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6651 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6652 Namespc->setRBraceLoc(RBrace); 6653 PopDeclContext(); 6654 if (Namespc->hasAttr<VisibilityAttr>()) 6655 PopPragmaVisibility(true, RBrace); 6656 } 6657 6658 CXXRecordDecl *Sema::getStdBadAlloc() const { 6659 return cast_or_null<CXXRecordDecl>( 6660 StdBadAlloc.get(Context.getExternalSource())); 6661 } 6662 6663 NamespaceDecl *Sema::getStdNamespace() const { 6664 return cast_or_null<NamespaceDecl>( 6665 StdNamespace.get(Context.getExternalSource())); 6666 } 6667 6668 /// \brief Retrieve the special "std" namespace, which may require us to 6669 /// implicitly define the namespace. 6670 NamespaceDecl *Sema::getOrCreateStdNamespace() { 6671 if (!StdNamespace) { 6672 // The "std" namespace has not yet been defined, so build one implicitly. 6673 StdNamespace = NamespaceDecl::Create(Context, 6674 Context.getTranslationUnitDecl(), 6675 /*Inline=*/false, 6676 SourceLocation(), SourceLocation(), 6677 &PP.getIdentifierTable().get("std"), 6678 /*PrevDecl=*/0); 6679 getStdNamespace()->setImplicit(true); 6680 } 6681 6682 return getStdNamespace(); 6683 } 6684 6685 bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6686 assert(getLangOpts().CPlusPlus && 6687 "Looking for std::initializer_list outside of C++."); 6688 6689 // We're looking for implicit instantiations of 6690 // template <typename E> class std::initializer_list. 6691 6692 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6693 return false; 6694 6695 ClassTemplateDecl *Template = 0; 6696 const TemplateArgument *Arguments = 0; 6697 6698 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6699 6700 ClassTemplateSpecializationDecl *Specialization = 6701 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6702 if (!Specialization) 6703 return false; 6704 6705 Template = Specialization->getSpecializedTemplate(); 6706 Arguments = Specialization->getTemplateArgs().data(); 6707 } else if (const TemplateSpecializationType *TST = 6708 Ty->getAs<TemplateSpecializationType>()) { 6709 Template = dyn_cast_or_null<ClassTemplateDecl>( 6710 TST->getTemplateName().getAsTemplateDecl()); 6711 Arguments = TST->getArgs(); 6712 } 6713 if (!Template) 6714 return false; 6715 6716 if (!StdInitializerList) { 6717 // Haven't recognized std::initializer_list yet, maybe this is it. 6718 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6719 if (TemplateClass->getIdentifier() != 6720 &PP.getIdentifierTable().get("initializer_list") || 6721 !getStdNamespace()->InEnclosingNamespaceSetOf( 6722 TemplateClass->getDeclContext())) 6723 return false; 6724 // This is a template called std::initializer_list, but is it the right 6725 // template? 6726 TemplateParameterList *Params = Template->getTemplateParameters(); 6727 if (Params->getMinRequiredArguments() != 1) 6728 return false; 6729 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6730 return false; 6731 6732 // It's the right template. 6733 StdInitializerList = Template; 6734 } 6735 6736 if (Template != StdInitializerList) 6737 return false; 6738 6739 // This is an instance of std::initializer_list. Find the argument type. 6740 if (Element) 6741 *Element = Arguments[0].getAsType(); 6742 return true; 6743 } 6744 6745 static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6746 NamespaceDecl *Std = S.getStdNamespace(); 6747 if (!Std) { 6748 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6749 return 0; 6750 } 6751 6752 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6753 Loc, Sema::LookupOrdinaryName); 6754 if (!S.LookupQualifiedName(Result, Std)) { 6755 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6756 return 0; 6757 } 6758 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6759 if (!Template) { 6760 Result.suppressDiagnostics(); 6761 // We found something weird. Complain about the first thing we found. 6762 NamedDecl *Found = *Result.begin(); 6763 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6764 return 0; 6765 } 6766 6767 // We found some template called std::initializer_list. Now verify that it's 6768 // correct. 6769 TemplateParameterList *Params = Template->getTemplateParameters(); 6770 if (Params->getMinRequiredArguments() != 1 || 6771 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6772 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6773 return 0; 6774 } 6775 6776 return Template; 6777 } 6778 6779 QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6780 if (!StdInitializerList) { 6781 StdInitializerList = LookupStdInitializerList(*this, Loc); 6782 if (!StdInitializerList) 6783 return QualType(); 6784 } 6785 6786 TemplateArgumentListInfo Args(Loc, Loc); 6787 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6788 Context.getTrivialTypeSourceInfo(Element, 6789 Loc))); 6790 return Context.getCanonicalType( 6791 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6792 } 6793 6794 bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6795 // C++ [dcl.init.list]p2: 6796 // A constructor is an initializer-list constructor if its first parameter 6797 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6798 // std::initializer_list<E> for some type E, and either there are no other 6799 // parameters or else all other parameters have default arguments. 6800 if (Ctor->getNumParams() < 1 || 6801 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6802 return false; 6803 6804 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6805 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6806 ArgType = RT->getPointeeType().getUnqualifiedType(); 6807 6808 return isStdInitializerList(ArgType, 0); 6809 } 6810 6811 /// \brief Determine whether a using statement is in a context where it will be 6812 /// apply in all contexts. 6813 static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6814 switch (CurContext->getDeclKind()) { 6815 case Decl::TranslationUnit: 6816 return true; 6817 case Decl::LinkageSpec: 6818 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6819 default: 6820 return false; 6821 } 6822 } 6823 6824 namespace { 6825 6826 // Callback to only accept typo corrections that are namespaces. 6827 class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6828 public: 6829 bool ValidateCandidate(const TypoCorrection &candidate) LLVM_OVERRIDE { 6830 if (NamedDecl *ND = candidate.getCorrectionDecl()) 6831 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6832 return false; 6833 } 6834 }; 6835 6836 } 6837 6838 static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6839 CXXScopeSpec &SS, 6840 SourceLocation IdentLoc, 6841 IdentifierInfo *Ident) { 6842 NamespaceValidatorCCC Validator; 6843 R.clear(); 6844 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6845 R.getLookupKind(), Sc, &SS, 6846 Validator)) { 6847 if (DeclContext *DC = S.computeDeclContext(SS, false)) { 6848 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6849 bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && 6850 Ident->getName().equals(CorrectedStr); 6851 S.diagnoseTypo(Corrected, 6852 S.PDiag(diag::err_using_directive_member_suggest) 6853 << Ident << DC << DroppedSpecifier << SS.getRange(), 6854 S.PDiag(diag::note_namespace_defined_here)); 6855 } else { 6856 S.diagnoseTypo(Corrected, 6857 S.PDiag(diag::err_using_directive_suggest) << Ident, 6858 S.PDiag(diag::note_namespace_defined_here)); 6859 } 6860 R.addDecl(Corrected.getCorrectionDecl()); 6861 return true; 6862 } 6863 return false; 6864 } 6865 6866 Decl *Sema::ActOnUsingDirective(Scope *S, 6867 SourceLocation UsingLoc, 6868 SourceLocation NamespcLoc, 6869 CXXScopeSpec &SS, 6870 SourceLocation IdentLoc, 6871 IdentifierInfo *NamespcName, 6872 AttributeList *AttrList) { 6873 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6874 assert(NamespcName && "Invalid NamespcName."); 6875 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6876 6877 // This can only happen along a recovery path. 6878 while (S->getFlags() & Scope::TemplateParamScope) 6879 S = S->getParent(); 6880 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6881 6882 UsingDirectiveDecl *UDir = 0; 6883 NestedNameSpecifier *Qualifier = 0; 6884 if (SS.isSet()) 6885 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6886 6887 // Lookup namespace name. 6888 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6889 LookupParsedName(R, S, &SS); 6890 if (R.isAmbiguous()) 6891 return 0; 6892 6893 if (R.empty()) { 6894 R.clear(); 6895 // Allow "using namespace std;" or "using namespace ::std;" even if 6896 // "std" hasn't been defined yet, for GCC compatibility. 6897 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6898 NamespcName->isStr("std")) { 6899 Diag(IdentLoc, diag::ext_using_undefined_std); 6900 R.addDecl(getOrCreateStdNamespace()); 6901 R.resolveKind(); 6902 } 6903 // Otherwise, attempt typo correction. 6904 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6905 } 6906 6907 if (!R.empty()) { 6908 NamedDecl *Named = R.getFoundDecl(); 6909 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6910 && "expected namespace decl"); 6911 // C++ [namespace.udir]p1: 6912 // A using-directive specifies that the names in the nominated 6913 // namespace can be used in the scope in which the 6914 // using-directive appears after the using-directive. During 6915 // unqualified name lookup (3.4.1), the names appear as if they 6916 // were declared in the nearest enclosing namespace which 6917 // contains both the using-directive and the nominated 6918 // namespace. [Note: in this context, "contains" means "contains 6919 // directly or indirectly". ] 6920 6921 // Find enclosing context containing both using-directive and 6922 // nominated namespace. 6923 NamespaceDecl *NS = getNamespaceDecl(Named); 6924 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6925 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6926 CommonAncestor = CommonAncestor->getParent(); 6927 6928 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6929 SS.getWithLocInContext(Context), 6930 IdentLoc, Named, CommonAncestor); 6931 6932 if (IsUsingDirectiveInToplevelContext(CurContext) && 6933 !SourceMgr.isInMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6934 Diag(IdentLoc, diag::warn_using_directive_in_header); 6935 } 6936 6937 PushUsingDirective(S, UDir); 6938 } else { 6939 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6940 } 6941 6942 if (UDir) 6943 ProcessDeclAttributeList(S, UDir, AttrList); 6944 6945 return UDir; 6946 } 6947 6948 void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6949 // If the scope has an associated entity and the using directive is at 6950 // namespace or translation unit scope, add the UsingDirectiveDecl into 6951 // its lookup structure so qualified name lookup can find it. 6952 DeclContext *Ctx = S->getEntity(); 6953 if (Ctx && !Ctx->isFunctionOrMethod()) 6954 Ctx->addDecl(UDir); 6955 else 6956 // Otherwise, it is at block sope. The using-directives will affect lookup 6957 // only to the end of the scope. 6958 S->PushUsingDirective(UDir); 6959 } 6960 6961 6962 Decl *Sema::ActOnUsingDeclaration(Scope *S, 6963 AccessSpecifier AS, 6964 bool HasUsingKeyword, 6965 SourceLocation UsingLoc, 6966 CXXScopeSpec &SS, 6967 UnqualifiedId &Name, 6968 AttributeList *AttrList, 6969 bool HasTypenameKeyword, 6970 SourceLocation TypenameLoc) { 6971 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6972 6973 switch (Name.getKind()) { 6974 case UnqualifiedId::IK_ImplicitSelfParam: 6975 case UnqualifiedId::IK_Identifier: 6976 case UnqualifiedId::IK_OperatorFunctionId: 6977 case UnqualifiedId::IK_LiteralOperatorId: 6978 case UnqualifiedId::IK_ConversionFunctionId: 6979 break; 6980 6981 case UnqualifiedId::IK_ConstructorName: 6982 case UnqualifiedId::IK_ConstructorTemplateId: 6983 // C++11 inheriting constructors. 6984 Diag(Name.getLocStart(), 6985 getLangOpts().CPlusPlus11 ? 6986 diag::warn_cxx98_compat_using_decl_constructor : 6987 diag::err_using_decl_constructor) 6988 << SS.getRange(); 6989 6990 if (getLangOpts().CPlusPlus11) break; 6991 6992 return 0; 6993 6994 case UnqualifiedId::IK_DestructorName: 6995 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6996 << SS.getRange(); 6997 return 0; 6998 6999 case UnqualifiedId::IK_TemplateId: 7000 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 7001 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 7002 return 0; 7003 } 7004 7005 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 7006 DeclarationName TargetName = TargetNameInfo.getName(); 7007 if (!TargetName) 7008 return 0; 7009 7010 // Warn about access declarations. 7011 if (!HasUsingKeyword) { 7012 Diag(Name.getLocStart(), 7013 getLangOpts().CPlusPlus11 ? diag::err_access_decl 7014 : diag::warn_access_decl_deprecated) 7015 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 7016 } 7017 7018 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 7019 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 7020 return 0; 7021 7022 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 7023 TargetNameInfo, AttrList, 7024 /* IsInstantiation */ false, 7025 HasTypenameKeyword, TypenameLoc); 7026 if (UD) 7027 PushOnScopeChains(UD, S, /*AddToContext*/ false); 7028 7029 return UD; 7030 } 7031 7032 /// \brief Determine whether a using declaration considers the given 7033 /// declarations as "equivalent", e.g., if they are redeclarations of 7034 /// the same entity or are both typedefs of the same type. 7035 static bool 7036 IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2) { 7037 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) 7038 return true; 7039 7040 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 7041 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) 7042 return Context.hasSameType(TD1->getUnderlyingType(), 7043 TD2->getUnderlyingType()); 7044 7045 return false; 7046 } 7047 7048 7049 /// Determines whether to create a using shadow decl for a particular 7050 /// decl, given the set of decls existing prior to this using lookup. 7051 bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 7052 const LookupResult &Previous, 7053 UsingShadowDecl *&PrevShadow) { 7054 // Diagnose finding a decl which is not from a base class of the 7055 // current class. We do this now because there are cases where this 7056 // function will silently decide not to build a shadow decl, which 7057 // will pre-empt further diagnostics. 7058 // 7059 // We don't need to do this in C++0x because we do the check once on 7060 // the qualifier. 7061 // 7062 // FIXME: diagnose the following if we care enough: 7063 // struct A { int foo; }; 7064 // struct B : A { using A::foo; }; 7065 // template <class T> struct C : A {}; 7066 // template <class T> struct D : C<T> { using B::foo; } // <--- 7067 // This is invalid (during instantiation) in C++03 because B::foo 7068 // resolves to the using decl in B, which is not a base class of D<T>. 7069 // We can't diagnose it immediately because C<T> is an unknown 7070 // specialization. The UsingShadowDecl in D<T> then points directly 7071 // to A::foo, which will look well-formed when we instantiate. 7072 // The right solution is to not collapse the shadow-decl chain. 7073 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 7074 DeclContext *OrigDC = Orig->getDeclContext(); 7075 7076 // Handle enums and anonymous structs. 7077 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 7078 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 7079 while (OrigRec->isAnonymousStructOrUnion()) 7080 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 7081 7082 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 7083 if (OrigDC == CurContext) { 7084 Diag(Using->getLocation(), 7085 diag::err_using_decl_nested_name_specifier_is_current_class) 7086 << Using->getQualifierLoc().getSourceRange(); 7087 Diag(Orig->getLocation(), diag::note_using_decl_target); 7088 return true; 7089 } 7090 7091 Diag(Using->getQualifierLoc().getBeginLoc(), 7092 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7093 << Using->getQualifier() 7094 << cast<CXXRecordDecl>(CurContext) 7095 << Using->getQualifierLoc().getSourceRange(); 7096 Diag(Orig->getLocation(), diag::note_using_decl_target); 7097 return true; 7098 } 7099 } 7100 7101 if (Previous.empty()) return false; 7102 7103 NamedDecl *Target = Orig; 7104 if (isa<UsingShadowDecl>(Target)) 7105 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7106 7107 // If the target happens to be one of the previous declarations, we 7108 // don't have a conflict. 7109 // 7110 // FIXME: but we might be increasing its access, in which case we 7111 // should redeclare it. 7112 NamedDecl *NonTag = 0, *Tag = 0; 7113 bool FoundEquivalentDecl = false; 7114 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 7115 I != E; ++I) { 7116 NamedDecl *D = (*I)->getUnderlyingDecl(); 7117 if (IsEquivalentForUsingDecl(Context, D, Target)) { 7118 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(*I)) 7119 PrevShadow = Shadow; 7120 FoundEquivalentDecl = true; 7121 } 7122 7123 (isa<TagDecl>(D) ? Tag : NonTag) = D; 7124 } 7125 7126 if (FoundEquivalentDecl) 7127 return false; 7128 7129 if (Target->isFunctionOrFunctionTemplate()) { 7130 FunctionDecl *FD; 7131 if (isa<FunctionTemplateDecl>(Target)) 7132 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 7133 else 7134 FD = cast<FunctionDecl>(Target); 7135 7136 NamedDecl *OldDecl = 0; 7137 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 7138 case Ovl_Overload: 7139 return false; 7140 7141 case Ovl_NonFunction: 7142 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7143 break; 7144 7145 // We found a decl with the exact signature. 7146 case Ovl_Match: 7147 // If we're in a record, we want to hide the target, so we 7148 // return true (without a diagnostic) to tell the caller not to 7149 // build a shadow decl. 7150 if (CurContext->isRecord()) 7151 return true; 7152 7153 // If we're not in a record, this is an error. 7154 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7155 break; 7156 } 7157 7158 Diag(Target->getLocation(), diag::note_using_decl_target); 7159 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 7160 return true; 7161 } 7162 7163 // Target is not a function. 7164 7165 if (isa<TagDecl>(Target)) { 7166 // No conflict between a tag and a non-tag. 7167 if (!Tag) return false; 7168 7169 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7170 Diag(Target->getLocation(), diag::note_using_decl_target); 7171 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 7172 return true; 7173 } 7174 7175 // No conflict between a tag and a non-tag. 7176 if (!NonTag) return false; 7177 7178 Diag(Using->getLocation(), diag::err_using_decl_conflict); 7179 Diag(Target->getLocation(), diag::note_using_decl_target); 7180 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 7181 return true; 7182 } 7183 7184 /// Builds a shadow declaration corresponding to a 'using' declaration. 7185 UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 7186 UsingDecl *UD, 7187 NamedDecl *Orig, 7188 UsingShadowDecl *PrevDecl) { 7189 7190 // If we resolved to another shadow declaration, just coalesce them. 7191 NamedDecl *Target = Orig; 7192 if (isa<UsingShadowDecl>(Target)) { 7193 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 7194 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 7195 } 7196 7197 UsingShadowDecl *Shadow 7198 = UsingShadowDecl::Create(Context, CurContext, 7199 UD->getLocation(), UD, Target); 7200 UD->addShadowDecl(Shadow); 7201 7202 Shadow->setAccess(UD->getAccess()); 7203 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 7204 Shadow->setInvalidDecl(); 7205 7206 Shadow->setPreviousDecl(PrevDecl); 7207 7208 if (S) 7209 PushOnScopeChains(Shadow, S); 7210 else 7211 CurContext->addDecl(Shadow); 7212 7213 7214 return Shadow; 7215 } 7216 7217 /// Hides a using shadow declaration. This is required by the current 7218 /// using-decl implementation when a resolvable using declaration in a 7219 /// class is followed by a declaration which would hide or override 7220 /// one or more of the using decl's targets; for example: 7221 /// 7222 /// struct Base { void foo(int); }; 7223 /// struct Derived : Base { 7224 /// using Base::foo; 7225 /// void foo(int); 7226 /// }; 7227 /// 7228 /// The governing language is C++03 [namespace.udecl]p12: 7229 /// 7230 /// When a using-declaration brings names from a base class into a 7231 /// derived class scope, member functions in the derived class 7232 /// override and/or hide member functions with the same name and 7233 /// parameter types in a base class (rather than conflicting). 7234 /// 7235 /// There are two ways to implement this: 7236 /// (1) optimistically create shadow decls when they're not hidden 7237 /// by existing declarations, or 7238 /// (2) don't create any shadow decls (or at least don't make them 7239 /// visible) until we've fully parsed/instantiated the class. 7240 /// The problem with (1) is that we might have to retroactively remove 7241 /// a shadow decl, which requires several O(n) operations because the 7242 /// decl structures are (very reasonably) not designed for removal. 7243 /// (2) avoids this but is very fiddly and phase-dependent. 7244 void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 7245 if (Shadow->getDeclName().getNameKind() == 7246 DeclarationName::CXXConversionFunctionName) 7247 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 7248 7249 // Remove it from the DeclContext... 7250 Shadow->getDeclContext()->removeDecl(Shadow); 7251 7252 // ...and the scope, if applicable... 7253 if (S) { 7254 S->RemoveDecl(Shadow); 7255 IdResolver.RemoveDecl(Shadow); 7256 } 7257 7258 // ...and the using decl. 7259 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 7260 7261 // TODO: complain somehow if Shadow was used. It shouldn't 7262 // be possible for this to happen, because...? 7263 } 7264 7265 namespace { 7266 class UsingValidatorCCC : public CorrectionCandidateCallback { 7267 public: 7268 UsingValidatorCCC(bool HasTypenameKeyword, bool IsInstantiation, 7269 bool RequireMember) 7270 : HasTypenameKeyword(HasTypenameKeyword), 7271 IsInstantiation(IsInstantiation), RequireMember(RequireMember) {} 7272 7273 bool ValidateCandidate(const TypoCorrection &Candidate) LLVM_OVERRIDE { 7274 NamedDecl *ND = Candidate.getCorrectionDecl(); 7275 7276 // Keywords are not valid here. 7277 if (!ND || isa<NamespaceDecl>(ND)) 7278 return false; 7279 7280 if (RequireMember && !isa<FieldDecl>(ND) && !isa<CXXMethodDecl>(ND) && 7281 !isa<TypeDecl>(ND)) 7282 return false; 7283 7284 // Completely unqualified names are invalid for a 'using' declaration. 7285 if (Candidate.WillReplaceSpecifier() && !Candidate.getCorrectionSpecifier()) 7286 return false; 7287 7288 if (isa<TypeDecl>(ND)) 7289 return HasTypenameKeyword || !IsInstantiation; 7290 7291 return !HasTypenameKeyword; 7292 } 7293 7294 private: 7295 bool HasTypenameKeyword; 7296 bool IsInstantiation; 7297 bool RequireMember; 7298 }; 7299 } // end anonymous namespace 7300 7301 /// Builds a using declaration. 7302 /// 7303 /// \param IsInstantiation - Whether this call arises from an 7304 /// instantiation of an unresolved using declaration. We treat 7305 /// the lookup differently for these declarations. 7306 NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7307 SourceLocation UsingLoc, 7308 CXXScopeSpec &SS, 7309 const DeclarationNameInfo &NameInfo, 7310 AttributeList *AttrList, 7311 bool IsInstantiation, 7312 bool HasTypenameKeyword, 7313 SourceLocation TypenameLoc) { 7314 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7315 SourceLocation IdentLoc = NameInfo.getLoc(); 7316 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7317 7318 // FIXME: We ignore attributes for now. 7319 7320 if (SS.isEmpty()) { 7321 Diag(IdentLoc, diag::err_using_requires_qualname); 7322 return 0; 7323 } 7324 7325 // Do the redeclaration lookup in the current scope. 7326 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7327 ForRedeclaration); 7328 Previous.setHideTags(false); 7329 if (S) { 7330 LookupName(Previous, S); 7331 7332 // It is really dumb that we have to do this. 7333 LookupResult::Filter F = Previous.makeFilter(); 7334 while (F.hasNext()) { 7335 NamedDecl *D = F.next(); 7336 if (!isDeclInScope(D, CurContext, S)) 7337 F.erase(); 7338 } 7339 F.done(); 7340 } else { 7341 assert(IsInstantiation && "no scope in non-instantiation"); 7342 assert(CurContext->isRecord() && "scope not record in instantiation"); 7343 LookupQualifiedName(Previous, CurContext); 7344 } 7345 7346 // Check for invalid redeclarations. 7347 if (CheckUsingDeclRedeclaration(UsingLoc, HasTypenameKeyword, 7348 SS, IdentLoc, Previous)) 7349 return 0; 7350 7351 // Check for bad qualifiers. 7352 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7353 return 0; 7354 7355 DeclContext *LookupContext = computeDeclContext(SS); 7356 NamedDecl *D; 7357 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7358 if (!LookupContext) { 7359 if (HasTypenameKeyword) { 7360 // FIXME: not all declaration name kinds are legal here 7361 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7362 UsingLoc, TypenameLoc, 7363 QualifierLoc, 7364 IdentLoc, NameInfo.getName()); 7365 } else { 7366 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7367 QualifierLoc, NameInfo); 7368 } 7369 } else { 7370 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7371 NameInfo, HasTypenameKeyword); 7372 } 7373 D->setAccess(AS); 7374 CurContext->addDecl(D); 7375 7376 if (!LookupContext) return D; 7377 UsingDecl *UD = cast<UsingDecl>(D); 7378 7379 if (RequireCompleteDeclContext(SS, LookupContext)) { 7380 UD->setInvalidDecl(); 7381 return UD; 7382 } 7383 7384 // The normal rules do not apply to inheriting constructor declarations. 7385 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7386 if (CheckInheritingConstructorUsingDecl(UD)) 7387 UD->setInvalidDecl(); 7388 return UD; 7389 } 7390 7391 // Otherwise, look up the target name. 7392 7393 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7394 7395 // Unlike most lookups, we don't always want to hide tag 7396 // declarations: tag names are visible through the using declaration 7397 // even if hidden by ordinary names, *except* in a dependent context 7398 // where it's important for the sanity of two-phase lookup. 7399 if (!IsInstantiation) 7400 R.setHideTags(false); 7401 7402 // For the purposes of this lookup, we have a base object type 7403 // equal to that of the current context. 7404 if (CurContext->isRecord()) { 7405 R.setBaseObjectType( 7406 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7407 } 7408 7409 LookupQualifiedName(R, LookupContext); 7410 7411 // Try to correct typos if possible. 7412 if (R.empty()) { 7413 UsingValidatorCCC CCC(HasTypenameKeyword, IsInstantiation, 7414 CurContext->isRecord()); 7415 if (TypoCorrection Corrected = CorrectTypo(R.getLookupNameInfo(), 7416 R.getLookupKind(), S, &SS, CCC)){ 7417 // We reject any correction for which ND would be NULL. 7418 NamedDecl *ND = Corrected.getCorrectionDecl(); 7419 R.setLookupName(Corrected.getCorrection()); 7420 R.addDecl(ND); 7421 // We reject candidates where DroppedSpecifier == true, hence the 7422 // literal '0' below. 7423 diagnoseTypo(Corrected, PDiag(diag::err_no_member_suggest) 7424 << NameInfo.getName() << LookupContext << 0 7425 << SS.getRange()); 7426 } else { 7427 Diag(IdentLoc, diag::err_no_member) 7428 << NameInfo.getName() << LookupContext << SS.getRange(); 7429 UD->setInvalidDecl(); 7430 return UD; 7431 } 7432 } 7433 7434 if (R.isAmbiguous()) { 7435 UD->setInvalidDecl(); 7436 return UD; 7437 } 7438 7439 if (HasTypenameKeyword) { 7440 // If we asked for a typename and got a non-type decl, error out. 7441 if (!R.getAsSingle<TypeDecl>()) { 7442 Diag(IdentLoc, diag::err_using_typename_non_type); 7443 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7444 Diag((*I)->getUnderlyingDecl()->getLocation(), 7445 diag::note_using_decl_target); 7446 UD->setInvalidDecl(); 7447 return UD; 7448 } 7449 } else { 7450 // If we asked for a non-typename and we got a type, error out, 7451 // but only if this is an instantiation of an unresolved using 7452 // decl. Otherwise just silently find the type name. 7453 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7454 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7455 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7456 UD->setInvalidDecl(); 7457 return UD; 7458 } 7459 } 7460 7461 // C++0x N2914 [namespace.udecl]p6: 7462 // A using-declaration shall not name a namespace. 7463 if (R.getAsSingle<NamespaceDecl>()) { 7464 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7465 << SS.getRange(); 7466 UD->setInvalidDecl(); 7467 return UD; 7468 } 7469 7470 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7471 UsingShadowDecl *PrevDecl = 0; 7472 if (!CheckUsingShadowDecl(UD, *I, Previous, PrevDecl)) 7473 BuildUsingShadowDecl(S, UD, *I, PrevDecl); 7474 } 7475 7476 return UD; 7477 } 7478 7479 /// Additional checks for a using declaration referring to a constructor name. 7480 bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7481 assert(!UD->hasTypename() && "expecting a constructor name"); 7482 7483 const Type *SourceType = UD->getQualifier()->getAsType(); 7484 assert(SourceType && 7485 "Using decl naming constructor doesn't have type in scope spec."); 7486 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7487 7488 // Check whether the named type is a direct base class. 7489 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7490 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7491 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7492 BaseIt != BaseE; ++BaseIt) { 7493 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7494 if (CanonicalSourceType == BaseType) 7495 break; 7496 if (BaseIt->getType()->isDependentType()) 7497 break; 7498 } 7499 7500 if (BaseIt == BaseE) { 7501 // Did not find SourceType in the bases. 7502 Diag(UD->getUsingLoc(), 7503 diag::err_using_decl_constructor_not_in_direct_base) 7504 << UD->getNameInfo().getSourceRange() 7505 << QualType(SourceType, 0) << TargetClass; 7506 return true; 7507 } 7508 7509 if (!CurContext->isDependentContext()) 7510 BaseIt->setInheritConstructors(); 7511 7512 return false; 7513 } 7514 7515 /// Checks that the given using declaration is not an invalid 7516 /// redeclaration. Note that this is checking only for the using decl 7517 /// itself, not for any ill-formedness among the UsingShadowDecls. 7518 bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7519 bool HasTypenameKeyword, 7520 const CXXScopeSpec &SS, 7521 SourceLocation NameLoc, 7522 const LookupResult &Prev) { 7523 // C++03 [namespace.udecl]p8: 7524 // C++0x [namespace.udecl]p10: 7525 // A using-declaration is a declaration and can therefore be used 7526 // repeatedly where (and only where) multiple declarations are 7527 // allowed. 7528 // 7529 // That's in non-member contexts. 7530 if (!CurContext->getRedeclContext()->isRecord()) 7531 return false; 7532 7533 NestedNameSpecifier *Qual 7534 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7535 7536 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7537 NamedDecl *D = *I; 7538 7539 bool DTypename; 7540 NestedNameSpecifier *DQual; 7541 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7542 DTypename = UD->hasTypename(); 7543 DQual = UD->getQualifier(); 7544 } else if (UnresolvedUsingValueDecl *UD 7545 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7546 DTypename = false; 7547 DQual = UD->getQualifier(); 7548 } else if (UnresolvedUsingTypenameDecl *UD 7549 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7550 DTypename = true; 7551 DQual = UD->getQualifier(); 7552 } else continue; 7553 7554 // using decls differ if one says 'typename' and the other doesn't. 7555 // FIXME: non-dependent using decls? 7556 if (HasTypenameKeyword != DTypename) continue; 7557 7558 // using decls differ if they name different scopes (but note that 7559 // template instantiation can cause this check to trigger when it 7560 // didn't before instantiation). 7561 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7562 Context.getCanonicalNestedNameSpecifier(DQual)) 7563 continue; 7564 7565 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7566 Diag(D->getLocation(), diag::note_using_decl) << 1; 7567 return true; 7568 } 7569 7570 return false; 7571 } 7572 7573 7574 /// Checks that the given nested-name qualifier used in a using decl 7575 /// in the current context is appropriately related to the current 7576 /// scope. If an error is found, diagnoses it and returns true. 7577 bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7578 const CXXScopeSpec &SS, 7579 SourceLocation NameLoc) { 7580 DeclContext *NamedContext = computeDeclContext(SS); 7581 7582 if (!CurContext->isRecord()) { 7583 // C++03 [namespace.udecl]p3: 7584 // C++0x [namespace.udecl]p8: 7585 // A using-declaration for a class member shall be a member-declaration. 7586 7587 // If we weren't able to compute a valid scope, it must be a 7588 // dependent class scope. 7589 if (!NamedContext || NamedContext->isRecord()) { 7590 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7591 << SS.getRange(); 7592 return true; 7593 } 7594 7595 // Otherwise, everything is known to be fine. 7596 return false; 7597 } 7598 7599 // The current scope is a record. 7600 7601 // If the named context is dependent, we can't decide much. 7602 if (!NamedContext) { 7603 // FIXME: in C++0x, we can diagnose if we can prove that the 7604 // nested-name-specifier does not refer to a base class, which is 7605 // still possible in some cases. 7606 7607 // Otherwise we have to conservatively report that things might be 7608 // okay. 7609 return false; 7610 } 7611 7612 if (!NamedContext->isRecord()) { 7613 // Ideally this would point at the last name in the specifier, 7614 // but we don't have that level of source info. 7615 Diag(SS.getRange().getBegin(), 7616 diag::err_using_decl_nested_name_specifier_is_not_class) 7617 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7618 return true; 7619 } 7620 7621 if (!NamedContext->isDependentContext() && 7622 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7623 return true; 7624 7625 if (getLangOpts().CPlusPlus11) { 7626 // C++0x [namespace.udecl]p3: 7627 // In a using-declaration used as a member-declaration, the 7628 // nested-name-specifier shall name a base class of the class 7629 // being defined. 7630 7631 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7632 cast<CXXRecordDecl>(NamedContext))) { 7633 if (CurContext == NamedContext) { 7634 Diag(NameLoc, 7635 diag::err_using_decl_nested_name_specifier_is_current_class) 7636 << SS.getRange(); 7637 return true; 7638 } 7639 7640 Diag(SS.getRange().getBegin(), 7641 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7642 << (NestedNameSpecifier*) SS.getScopeRep() 7643 << cast<CXXRecordDecl>(CurContext) 7644 << SS.getRange(); 7645 return true; 7646 } 7647 7648 return false; 7649 } 7650 7651 // C++03 [namespace.udecl]p4: 7652 // A using-declaration used as a member-declaration shall refer 7653 // to a member of a base class of the class being defined [etc.]. 7654 7655 // Salient point: SS doesn't have to name a base class as long as 7656 // lookup only finds members from base classes. Therefore we can 7657 // diagnose here only if we can prove that that can't happen, 7658 // i.e. if the class hierarchies provably don't intersect. 7659 7660 // TODO: it would be nice if "definitely valid" results were cached 7661 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7662 // need to be repeated. 7663 7664 struct UserData { 7665 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7666 7667 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7668 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7669 Data->Bases.insert(Base); 7670 return true; 7671 } 7672 7673 bool hasDependentBases(const CXXRecordDecl *Class) { 7674 return !Class->forallBases(collect, this); 7675 } 7676 7677 /// Returns true if the base is dependent or is one of the 7678 /// accumulated base classes. 7679 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7680 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7681 return !Data->Bases.count(Base); 7682 } 7683 7684 bool mightShareBases(const CXXRecordDecl *Class) { 7685 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7686 } 7687 }; 7688 7689 UserData Data; 7690 7691 // Returns false if we find a dependent base. 7692 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7693 return false; 7694 7695 // Returns false if the class has a dependent base or if it or one 7696 // of its bases is present in the base set of the current context. 7697 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7698 return false; 7699 7700 Diag(SS.getRange().getBegin(), 7701 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7702 << (NestedNameSpecifier*) SS.getScopeRep() 7703 << cast<CXXRecordDecl>(CurContext) 7704 << SS.getRange(); 7705 7706 return true; 7707 } 7708 7709 Decl *Sema::ActOnAliasDeclaration(Scope *S, 7710 AccessSpecifier AS, 7711 MultiTemplateParamsArg TemplateParamLists, 7712 SourceLocation UsingLoc, 7713 UnqualifiedId &Name, 7714 AttributeList *AttrList, 7715 TypeResult Type) { 7716 // Skip up to the relevant declaration scope. 7717 while (S->getFlags() & Scope::TemplateParamScope) 7718 S = S->getParent(); 7719 assert((S->getFlags() & Scope::DeclScope) && 7720 "got alias-declaration outside of declaration scope"); 7721 7722 if (Type.isInvalid()) 7723 return 0; 7724 7725 bool Invalid = false; 7726 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7727 TypeSourceInfo *TInfo = 0; 7728 GetTypeFromParser(Type.get(), &TInfo); 7729 7730 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7731 return 0; 7732 7733 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7734 UPPC_DeclarationType)) { 7735 Invalid = true; 7736 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7737 TInfo->getTypeLoc().getBeginLoc()); 7738 } 7739 7740 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7741 LookupName(Previous, S); 7742 7743 // Warn about shadowing the name of a template parameter. 7744 if (Previous.isSingleResult() && 7745 Previous.getFoundDecl()->isTemplateParameter()) { 7746 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7747 Previous.clear(); 7748 } 7749 7750 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7751 "name in alias declaration must be an identifier"); 7752 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7753 Name.StartLocation, 7754 Name.Identifier, TInfo); 7755 7756 NewTD->setAccess(AS); 7757 7758 if (Invalid) 7759 NewTD->setInvalidDecl(); 7760 7761 ProcessDeclAttributeList(S, NewTD, AttrList); 7762 7763 CheckTypedefForVariablyModifiedType(S, NewTD); 7764 Invalid |= NewTD->isInvalidDecl(); 7765 7766 bool Redeclaration = false; 7767 7768 NamedDecl *NewND; 7769 if (TemplateParamLists.size()) { 7770 TypeAliasTemplateDecl *OldDecl = 0; 7771 TemplateParameterList *OldTemplateParams = 0; 7772 7773 if (TemplateParamLists.size() != 1) { 7774 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7775 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7776 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7777 } 7778 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7779 7780 // Only consider previous declarations in the same scope. 7781 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7782 /*ExplicitInstantiationOrSpecialization*/false); 7783 if (!Previous.empty()) { 7784 Redeclaration = true; 7785 7786 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7787 if (!OldDecl && !Invalid) { 7788 Diag(UsingLoc, diag::err_redefinition_different_kind) 7789 << Name.Identifier; 7790 7791 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7792 if (OldD->getLocation().isValid()) 7793 Diag(OldD->getLocation(), diag::note_previous_definition); 7794 7795 Invalid = true; 7796 } 7797 7798 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7799 if (TemplateParameterListsAreEqual(TemplateParams, 7800 OldDecl->getTemplateParameters(), 7801 /*Complain=*/true, 7802 TPL_TemplateMatch)) 7803 OldTemplateParams = OldDecl->getTemplateParameters(); 7804 else 7805 Invalid = true; 7806 7807 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7808 if (!Invalid && 7809 !Context.hasSameType(OldTD->getUnderlyingType(), 7810 NewTD->getUnderlyingType())) { 7811 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7812 // but we can't reasonably accept it. 7813 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7814 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7815 if (OldTD->getLocation().isValid()) 7816 Diag(OldTD->getLocation(), diag::note_previous_definition); 7817 Invalid = true; 7818 } 7819 } 7820 } 7821 7822 // Merge any previous default template arguments into our parameters, 7823 // and check the parameter list. 7824 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7825 TPC_TypeAliasTemplate)) 7826 return 0; 7827 7828 TypeAliasTemplateDecl *NewDecl = 7829 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7830 Name.Identifier, TemplateParams, 7831 NewTD); 7832 7833 NewDecl->setAccess(AS); 7834 7835 if (Invalid) 7836 NewDecl->setInvalidDecl(); 7837 else if (OldDecl) 7838 NewDecl->setPreviousDecl(OldDecl); 7839 7840 NewND = NewDecl; 7841 } else { 7842 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7843 NewND = NewTD; 7844 } 7845 7846 if (!Redeclaration) 7847 PushOnScopeChains(NewND, S); 7848 7849 ActOnDocumentableDecl(NewND); 7850 return NewND; 7851 } 7852 7853 Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7854 SourceLocation NamespaceLoc, 7855 SourceLocation AliasLoc, 7856 IdentifierInfo *Alias, 7857 CXXScopeSpec &SS, 7858 SourceLocation IdentLoc, 7859 IdentifierInfo *Ident) { 7860 7861 // Lookup the namespace name. 7862 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7863 LookupParsedName(R, S, &SS); 7864 7865 // Check if we have a previous declaration with the same name. 7866 NamedDecl *PrevDecl 7867 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7868 ForRedeclaration); 7869 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7870 PrevDecl = 0; 7871 7872 if (PrevDecl) { 7873 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7874 // We already have an alias with the same name that points to the same 7875 // namespace, so don't create a new one. 7876 // FIXME: At some point, we'll want to create the (redundant) 7877 // declaration to maintain better source information. 7878 if (!R.isAmbiguous() && !R.empty() && 7879 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7880 return 0; 7881 } 7882 7883 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7884 diag::err_redefinition_different_kind; 7885 Diag(AliasLoc, DiagID) << Alias; 7886 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7887 return 0; 7888 } 7889 7890 if (R.isAmbiguous()) 7891 return 0; 7892 7893 if (R.empty()) { 7894 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7895 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7896 return 0; 7897 } 7898 } 7899 7900 NamespaceAliasDecl *AliasDecl = 7901 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7902 Alias, SS.getWithLocInContext(Context), 7903 IdentLoc, R.getFoundDecl()); 7904 7905 PushOnScopeChains(AliasDecl, S); 7906 return AliasDecl; 7907 } 7908 7909 Sema::ImplicitExceptionSpecification 7910 Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7911 CXXMethodDecl *MD) { 7912 CXXRecordDecl *ClassDecl = MD->getParent(); 7913 7914 // C++ [except.spec]p14: 7915 // An implicitly declared special member function (Clause 12) shall have an 7916 // exception-specification. [...] 7917 ImplicitExceptionSpecification ExceptSpec(*this); 7918 if (ClassDecl->isInvalidDecl()) 7919 return ExceptSpec; 7920 7921 // Direct base-class constructors. 7922 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7923 BEnd = ClassDecl->bases_end(); 7924 B != BEnd; ++B) { 7925 if (B->isVirtual()) // Handled below. 7926 continue; 7927 7928 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7929 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7930 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7931 // If this is a deleted function, add it anyway. This might be conformant 7932 // with the standard. This might not. I'm not sure. It might not matter. 7933 if (Constructor) 7934 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7935 } 7936 } 7937 7938 // Virtual base-class constructors. 7939 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7940 BEnd = ClassDecl->vbases_end(); 7941 B != BEnd; ++B) { 7942 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7943 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7944 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7945 // If this is a deleted function, add it anyway. This might be conformant 7946 // with the standard. This might not. I'm not sure. It might not matter. 7947 if (Constructor) 7948 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7949 } 7950 } 7951 7952 // Field constructors. 7953 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7954 FEnd = ClassDecl->field_end(); 7955 F != FEnd; ++F) { 7956 if (F->hasInClassInitializer()) { 7957 if (Expr *E = F->getInClassInitializer()) 7958 ExceptSpec.CalledExpr(E); 7959 else if (!F->isInvalidDecl()) 7960 // DR1351: 7961 // If the brace-or-equal-initializer of a non-static data member 7962 // invokes a defaulted default constructor of its class or of an 7963 // enclosing class in a potentially evaluated subexpression, the 7964 // program is ill-formed. 7965 // 7966 // This resolution is unworkable: the exception specification of the 7967 // default constructor can be needed in an unevaluated context, in 7968 // particular, in the operand of a noexcept-expression, and we can be 7969 // unable to compute an exception specification for an enclosed class. 7970 // 7971 // We do not allow an in-class initializer to require the evaluation 7972 // of the exception specification for any in-class initializer whose 7973 // definition is not lexically complete. 7974 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7975 } else if (const RecordType *RecordTy 7976 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7977 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7978 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7979 // If this is a deleted function, add it anyway. This might be conformant 7980 // with the standard. This might not. I'm not sure. It might not matter. 7981 // In particular, the problem is that this function never gets called. It 7982 // might just be ill-formed because this function attempts to refer to 7983 // a deleted function here. 7984 if (Constructor) 7985 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7986 } 7987 } 7988 7989 return ExceptSpec; 7990 } 7991 7992 Sema::ImplicitExceptionSpecification 7993 Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7994 CXXRecordDecl *ClassDecl = CD->getParent(); 7995 7996 // C++ [except.spec]p14: 7997 // An inheriting constructor [...] shall have an exception-specification. [...] 7998 ImplicitExceptionSpecification ExceptSpec(*this); 7999 if (ClassDecl->isInvalidDecl()) 8000 return ExceptSpec; 8001 8002 // Inherited constructor. 8003 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 8004 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 8005 // FIXME: Copying or moving the parameters could add extra exceptions to the 8006 // set, as could the default arguments for the inherited constructor. This 8007 // will be addressed when we implement the resolution of core issue 1351. 8008 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 8009 8010 // Direct base-class constructors. 8011 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8012 BEnd = ClassDecl->bases_end(); 8013 B != BEnd; ++B) { 8014 if (B->isVirtual()) // Handled below. 8015 continue; 8016 8017 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8018 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8019 if (BaseClassDecl == InheritedDecl) 8020 continue; 8021 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 8022 if (Constructor) 8023 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8024 } 8025 } 8026 8027 // Virtual base-class constructors. 8028 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8029 BEnd = ClassDecl->vbases_end(); 8030 B != BEnd; ++B) { 8031 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8032 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8033 if (BaseClassDecl == InheritedDecl) 8034 continue; 8035 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 8036 if (Constructor) 8037 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8038 } 8039 } 8040 8041 // Field constructors. 8042 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8043 FEnd = ClassDecl->field_end(); 8044 F != FEnd; ++F) { 8045 if (F->hasInClassInitializer()) { 8046 if (Expr *E = F->getInClassInitializer()) 8047 ExceptSpec.CalledExpr(E); 8048 else if (!F->isInvalidDecl()) 8049 Diag(CD->getLocation(), 8050 diag::err_in_class_initializer_references_def_ctor) << CD; 8051 } else if (const RecordType *RecordTy 8052 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 8053 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8054 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 8055 if (Constructor) 8056 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8057 } 8058 } 8059 8060 return ExceptSpec; 8061 } 8062 8063 namespace { 8064 /// RAII object to register a special member as being currently declared. 8065 struct DeclaringSpecialMember { 8066 Sema &S; 8067 Sema::SpecialMemberDecl D; 8068 bool WasAlreadyBeingDeclared; 8069 8070 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 8071 : S(S), D(RD, CSM) { 8072 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 8073 if (WasAlreadyBeingDeclared) 8074 // This almost never happens, but if it does, ensure that our cache 8075 // doesn't contain a stale result. 8076 S.SpecialMemberCache.clear(); 8077 8078 // FIXME: Register a note to be produced if we encounter an error while 8079 // declaring the special member. 8080 } 8081 ~DeclaringSpecialMember() { 8082 if (!WasAlreadyBeingDeclared) 8083 S.SpecialMembersBeingDeclared.erase(D); 8084 } 8085 8086 /// \brief Are we already trying to declare this special member? 8087 bool isAlreadyBeingDeclared() const { 8088 return WasAlreadyBeingDeclared; 8089 } 8090 }; 8091 } 8092 8093 CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 8094 CXXRecordDecl *ClassDecl) { 8095 // C++ [class.ctor]p5: 8096 // A default constructor for a class X is a constructor of class X 8097 // that can be called without an argument. If there is no 8098 // user-declared constructor for class X, a default constructor is 8099 // implicitly declared. An implicitly-declared default constructor 8100 // is an inline public member of its class. 8101 assert(ClassDecl->needsImplicitDefaultConstructor() && 8102 "Should not build implicit default constructor!"); 8103 8104 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 8105 if (DSM.isAlreadyBeingDeclared()) 8106 return 0; 8107 8108 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8109 CXXDefaultConstructor, 8110 false); 8111 8112 // Create the actual constructor declaration. 8113 CanQualType ClassType 8114 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8115 SourceLocation ClassLoc = ClassDecl->getLocation(); 8116 DeclarationName Name 8117 = Context.DeclarationNames.getCXXConstructorName(ClassType); 8118 DeclarationNameInfo NameInfo(Name, ClassLoc); 8119 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 8120 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 8121 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8122 Constexpr); 8123 DefaultCon->setAccess(AS_public); 8124 DefaultCon->setDefaulted(); 8125 DefaultCon->setImplicit(); 8126 8127 // Build an exception specification pointing back at this constructor. 8128 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, DefaultCon); 8129 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8130 8131 // We don't need to use SpecialMemberIsTrivial here; triviality for default 8132 // constructors is easy to compute. 8133 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 8134 8135 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 8136 SetDeclDeleted(DefaultCon, ClassLoc); 8137 8138 // Note that we have declared this constructor. 8139 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 8140 8141 if (Scope *S = getScopeForContext(ClassDecl)) 8142 PushOnScopeChains(DefaultCon, S, false); 8143 ClassDecl->addDecl(DefaultCon); 8144 8145 return DefaultCon; 8146 } 8147 8148 void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 8149 CXXConstructorDecl *Constructor) { 8150 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 8151 !Constructor->doesThisDeclarationHaveABody() && 8152 !Constructor->isDeleted()) && 8153 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 8154 8155 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8156 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 8157 8158 SynthesizedFunctionScope Scope(*this, Constructor); 8159 DiagnosticErrorTrap Trap(Diags); 8160 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8161 Trap.hasErrorOccurred()) { 8162 Diag(CurrentLocation, diag::note_member_synthesized_at) 8163 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 8164 Constructor->setInvalidDecl(); 8165 return; 8166 } 8167 8168 SourceLocation Loc = Constructor->getLocation(); 8169 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8170 8171 Constructor->markUsed(Context); 8172 MarkVTableUsed(CurrentLocation, ClassDecl); 8173 8174 if (ASTMutationListener *L = getASTMutationListener()) { 8175 L->CompletedImplicitDefinition(Constructor); 8176 } 8177 8178 DiagnoseUninitializedFields(*this, Constructor); 8179 } 8180 8181 void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 8182 // Perform any delayed checks on exception specifications. 8183 CheckDelayedMemberExceptionSpecs(); 8184 } 8185 8186 namespace { 8187 /// Information on inheriting constructors to declare. 8188 class InheritingConstructorInfo { 8189 public: 8190 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 8191 : SemaRef(SemaRef), Derived(Derived) { 8192 // Mark the constructors that we already have in the derived class. 8193 // 8194 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 8195 // unless there is a user-declared constructor with the same signature in 8196 // the class where the using-declaration appears. 8197 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 8198 } 8199 8200 void inheritAll(CXXRecordDecl *RD) { 8201 visitAll(RD, &InheritingConstructorInfo::inherit); 8202 } 8203 8204 private: 8205 /// Information about an inheriting constructor. 8206 struct InheritingConstructor { 8207 InheritingConstructor() 8208 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 8209 8210 /// If \c true, a constructor with this signature is already declared 8211 /// in the derived class. 8212 bool DeclaredInDerived; 8213 8214 /// The constructor which is inherited. 8215 const CXXConstructorDecl *BaseCtor; 8216 8217 /// The derived constructor we declared. 8218 CXXConstructorDecl *DerivedCtor; 8219 }; 8220 8221 /// Inheriting constructors with a given canonical type. There can be at 8222 /// most one such non-template constructor, and any number of templated 8223 /// constructors. 8224 struct InheritingConstructorsForType { 8225 InheritingConstructor NonTemplate; 8226 SmallVector<std::pair<TemplateParameterList *, InheritingConstructor>, 4> 8227 Templates; 8228 8229 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 8230 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 8231 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 8232 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 8233 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 8234 false, S.TPL_TemplateMatch)) 8235 return Templates[I].second; 8236 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 8237 return Templates.back().second; 8238 } 8239 8240 return NonTemplate; 8241 } 8242 }; 8243 8244 /// Get or create the inheriting constructor record for a constructor. 8245 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 8246 QualType CtorType) { 8247 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 8248 .getEntry(SemaRef, Ctor); 8249 } 8250 8251 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 8252 8253 /// Process all constructors for a class. 8254 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 8255 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 8256 CtorE = RD->ctor_end(); 8257 CtorIt != CtorE; ++CtorIt) 8258 (this->*Callback)(*CtorIt); 8259 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 8260 I(RD->decls_begin()), E(RD->decls_end()); 8261 I != E; ++I) { 8262 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 8263 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 8264 (this->*Callback)(CD); 8265 } 8266 } 8267 8268 /// Note that a constructor (or constructor template) was declared in Derived. 8269 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 8270 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 8271 } 8272 8273 /// Inherit a single constructor. 8274 void inherit(const CXXConstructorDecl *Ctor) { 8275 const FunctionProtoType *CtorType = 8276 Ctor->getType()->castAs<FunctionProtoType>(); 8277 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 8278 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 8279 8280 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 8281 8282 // Core issue (no number yet): the ellipsis is always discarded. 8283 if (EPI.Variadic) { 8284 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 8285 SemaRef.Diag(Ctor->getLocation(), 8286 diag::note_using_decl_constructor_ellipsis); 8287 EPI.Variadic = false; 8288 } 8289 8290 // Declare a constructor for each number of parameters. 8291 // 8292 // C++11 [class.inhctor]p1: 8293 // The candidate set of inherited constructors from the class X named in 8294 // the using-declaration consists of [... modulo defects ...] for each 8295 // constructor or constructor template of X, the set of constructors or 8296 // constructor templates that results from omitting any ellipsis parameter 8297 // specification and successively omitting parameters with a default 8298 // argument from the end of the parameter-type-list 8299 unsigned MinParams = minParamsToInherit(Ctor); 8300 unsigned Params = Ctor->getNumParams(); 8301 if (Params >= MinParams) { 8302 do 8303 declareCtor(UsingLoc, Ctor, 8304 SemaRef.Context.getFunctionType( 8305 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 8306 while (Params > MinParams && 8307 Ctor->getParamDecl(--Params)->hasDefaultArg()); 8308 } 8309 } 8310 8311 /// Find the using-declaration which specified that we should inherit the 8312 /// constructors of \p Base. 8313 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 8314 // No fancy lookup required; just look for the base constructor name 8315 // directly within the derived class. 8316 ASTContext &Context = SemaRef.Context; 8317 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8318 Context.getCanonicalType(Context.getRecordType(Base))); 8319 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 8320 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 8321 } 8322 8323 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8324 // C++11 [class.inhctor]p3: 8325 // [F]or each constructor template in the candidate set of inherited 8326 // constructors, a constructor template is implicitly declared 8327 if (Ctor->getDescribedFunctionTemplate()) 8328 return 0; 8329 8330 // For each non-template constructor in the candidate set of inherited 8331 // constructors other than a constructor having no parameters or a 8332 // copy/move constructor having a single parameter, a constructor is 8333 // implicitly declared [...] 8334 if (Ctor->getNumParams() == 0) 8335 return 1; 8336 if (Ctor->isCopyOrMoveConstructor()) 8337 return 2; 8338 8339 // Per discussion on core reflector, never inherit a constructor which 8340 // would become a default, copy, or move constructor of Derived either. 8341 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8342 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8343 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8344 } 8345 8346 /// Declare a single inheriting constructor, inheriting the specified 8347 /// constructor, with the given type. 8348 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8349 QualType DerivedType) { 8350 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8351 8352 // C++11 [class.inhctor]p3: 8353 // ... a constructor is implicitly declared with the same constructor 8354 // characteristics unless there is a user-declared constructor with 8355 // the same signature in the class where the using-declaration appears 8356 if (Entry.DeclaredInDerived) 8357 return; 8358 8359 // C++11 [class.inhctor]p7: 8360 // If two using-declarations declare inheriting constructors with the 8361 // same signature, the program is ill-formed 8362 if (Entry.DerivedCtor) { 8363 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8364 // Only diagnose this once per constructor. 8365 if (Entry.DerivedCtor->isInvalidDecl()) 8366 return; 8367 Entry.DerivedCtor->setInvalidDecl(); 8368 8369 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8370 SemaRef.Diag(BaseCtor->getLocation(), 8371 diag::note_using_decl_constructor_conflict_current_ctor); 8372 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8373 diag::note_using_decl_constructor_conflict_previous_ctor); 8374 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8375 diag::note_using_decl_constructor_conflict_previous_using); 8376 } else { 8377 // Core issue (no number): if the same inheriting constructor is 8378 // produced by multiple base class constructors from the same base 8379 // class, the inheriting constructor is defined as deleted. 8380 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8381 } 8382 8383 return; 8384 } 8385 8386 ASTContext &Context = SemaRef.Context; 8387 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8388 Context.getCanonicalType(Context.getRecordType(Derived))); 8389 DeclarationNameInfo NameInfo(Name, UsingLoc); 8390 8391 TemplateParameterList *TemplateParams = 0; 8392 if (const FunctionTemplateDecl *FTD = 8393 BaseCtor->getDescribedFunctionTemplate()) { 8394 TemplateParams = FTD->getTemplateParameters(); 8395 // We're reusing template parameters from a different DeclContext. This 8396 // is questionable at best, but works out because the template depth in 8397 // both places is guaranteed to be 0. 8398 // FIXME: Rebuild the template parameters in the new context, and 8399 // transform the function type to refer to them. 8400 } 8401 8402 // Build type source info pointing at the using-declaration. This is 8403 // required by template instantiation. 8404 TypeSourceInfo *TInfo = 8405 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8406 FunctionProtoTypeLoc ProtoLoc = 8407 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8408 8409 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8410 Context, Derived, UsingLoc, NameInfo, DerivedType, 8411 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8412 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8413 8414 // Build an unevaluated exception specification for this constructor. 8415 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8416 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8417 EPI.ExceptionSpecType = EST_Unevaluated; 8418 EPI.ExceptionSpecDecl = DerivedCtor; 8419 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8420 FPT->getArgTypes(), EPI)); 8421 8422 // Build the parameter declarations. 8423 SmallVector<ParmVarDecl *, 16> ParamDecls; 8424 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8425 TypeSourceInfo *TInfo = 8426 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8427 ParmVarDecl *PD = ParmVarDecl::Create( 8428 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8429 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8430 PD->setScopeInfo(0, I); 8431 PD->setImplicit(); 8432 ParamDecls.push_back(PD); 8433 ProtoLoc.setArg(I, PD); 8434 } 8435 8436 // Set up the new constructor. 8437 DerivedCtor->setAccess(BaseCtor->getAccess()); 8438 DerivedCtor->setParams(ParamDecls); 8439 DerivedCtor->setInheritedConstructor(BaseCtor); 8440 if (BaseCtor->isDeleted()) 8441 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8442 8443 // If this is a constructor template, build the template declaration. 8444 if (TemplateParams) { 8445 FunctionTemplateDecl *DerivedTemplate = 8446 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8447 TemplateParams, DerivedCtor); 8448 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8449 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8450 Derived->addDecl(DerivedTemplate); 8451 } else { 8452 Derived->addDecl(DerivedCtor); 8453 } 8454 8455 Entry.BaseCtor = BaseCtor; 8456 Entry.DerivedCtor = DerivedCtor; 8457 } 8458 8459 Sema &SemaRef; 8460 CXXRecordDecl *Derived; 8461 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8462 MapType Map; 8463 }; 8464 } 8465 8466 void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8467 // Defer declaring the inheriting constructors until the class is 8468 // instantiated. 8469 if (ClassDecl->isDependentContext()) 8470 return; 8471 8472 // Find base classes from which we might inherit constructors. 8473 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8474 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8475 BaseE = ClassDecl->bases_end(); 8476 BaseIt != BaseE; ++BaseIt) 8477 if (BaseIt->getInheritConstructors()) 8478 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8479 8480 // Go no further if we're not inheriting any constructors. 8481 if (InheritedBases.empty()) 8482 return; 8483 8484 // Declare the inherited constructors. 8485 InheritingConstructorInfo ICI(*this, ClassDecl); 8486 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8487 ICI.inheritAll(InheritedBases[I]); 8488 } 8489 8490 void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8491 CXXConstructorDecl *Constructor) { 8492 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8493 assert(Constructor->getInheritedConstructor() && 8494 !Constructor->doesThisDeclarationHaveABody() && 8495 !Constructor->isDeleted()); 8496 8497 SynthesizedFunctionScope Scope(*this, Constructor); 8498 DiagnosticErrorTrap Trap(Diags); 8499 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8500 Trap.hasErrorOccurred()) { 8501 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8502 << Context.getTagDeclType(ClassDecl); 8503 Constructor->setInvalidDecl(); 8504 return; 8505 } 8506 8507 SourceLocation Loc = Constructor->getLocation(); 8508 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8509 8510 Constructor->markUsed(Context); 8511 MarkVTableUsed(CurrentLocation, ClassDecl); 8512 8513 if (ASTMutationListener *L = getASTMutationListener()) { 8514 L->CompletedImplicitDefinition(Constructor); 8515 } 8516 } 8517 8518 8519 Sema::ImplicitExceptionSpecification 8520 Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8521 CXXRecordDecl *ClassDecl = MD->getParent(); 8522 8523 // C++ [except.spec]p14: 8524 // An implicitly declared special member function (Clause 12) shall have 8525 // an exception-specification. 8526 ImplicitExceptionSpecification ExceptSpec(*this); 8527 if (ClassDecl->isInvalidDecl()) 8528 return ExceptSpec; 8529 8530 // Direct base-class destructors. 8531 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8532 BEnd = ClassDecl->bases_end(); 8533 B != BEnd; ++B) { 8534 if (B->isVirtual()) // Handled below. 8535 continue; 8536 8537 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8538 ExceptSpec.CalledDecl(B->getLocStart(), 8539 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8540 } 8541 8542 // Virtual base-class destructors. 8543 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8544 BEnd = ClassDecl->vbases_end(); 8545 B != BEnd; ++B) { 8546 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8547 ExceptSpec.CalledDecl(B->getLocStart(), 8548 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8549 } 8550 8551 // Field destructors. 8552 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8553 FEnd = ClassDecl->field_end(); 8554 F != FEnd; ++F) { 8555 if (const RecordType *RecordTy 8556 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8557 ExceptSpec.CalledDecl(F->getLocation(), 8558 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8559 } 8560 8561 return ExceptSpec; 8562 } 8563 8564 CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8565 // C++ [class.dtor]p2: 8566 // If a class has no user-declared destructor, a destructor is 8567 // declared implicitly. An implicitly-declared destructor is an 8568 // inline public member of its class. 8569 assert(ClassDecl->needsImplicitDestructor()); 8570 8571 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8572 if (DSM.isAlreadyBeingDeclared()) 8573 return 0; 8574 8575 // Create the actual destructor declaration. 8576 CanQualType ClassType 8577 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8578 SourceLocation ClassLoc = ClassDecl->getLocation(); 8579 DeclarationName Name 8580 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8581 DeclarationNameInfo NameInfo(Name, ClassLoc); 8582 CXXDestructorDecl *Destructor 8583 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8584 QualType(), 0, /*isInline=*/true, 8585 /*isImplicitlyDeclared=*/true); 8586 Destructor->setAccess(AS_public); 8587 Destructor->setDefaulted(); 8588 Destructor->setImplicit(); 8589 8590 // Build an exception specification pointing back at this destructor. 8591 FunctionProtoType::ExtProtoInfo EPI = getImplicitMethodEPI(*this, Destructor); 8592 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8593 8594 AddOverriddenMethods(ClassDecl, Destructor); 8595 8596 // We don't need to use SpecialMemberIsTrivial here; triviality for 8597 // destructors is easy to compute. 8598 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8599 8600 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8601 SetDeclDeleted(Destructor, ClassLoc); 8602 8603 // Note that we have declared this destructor. 8604 ++ASTContext::NumImplicitDestructorsDeclared; 8605 8606 // Introduce this destructor into its scope. 8607 if (Scope *S = getScopeForContext(ClassDecl)) 8608 PushOnScopeChains(Destructor, S, false); 8609 ClassDecl->addDecl(Destructor); 8610 8611 return Destructor; 8612 } 8613 8614 void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8615 CXXDestructorDecl *Destructor) { 8616 assert((Destructor->isDefaulted() && 8617 !Destructor->doesThisDeclarationHaveABody() && 8618 !Destructor->isDeleted()) && 8619 "DefineImplicitDestructor - call it for implicit default dtor"); 8620 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8621 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8622 8623 if (Destructor->isInvalidDecl()) 8624 return; 8625 8626 SynthesizedFunctionScope Scope(*this, Destructor); 8627 8628 DiagnosticErrorTrap Trap(Diags); 8629 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8630 Destructor->getParent()); 8631 8632 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8633 Diag(CurrentLocation, diag::note_member_synthesized_at) 8634 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8635 8636 Destructor->setInvalidDecl(); 8637 return; 8638 } 8639 8640 SourceLocation Loc = Destructor->getLocation(); 8641 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8642 Destructor->markUsed(Context); 8643 MarkVTableUsed(CurrentLocation, ClassDecl); 8644 8645 if (ASTMutationListener *L = getASTMutationListener()) { 8646 L->CompletedImplicitDefinition(Destructor); 8647 } 8648 } 8649 8650 /// \brief Perform any semantic analysis which needs to be delayed until all 8651 /// pending class member declarations have been parsed. 8652 void Sema::ActOnFinishCXXMemberDecls() { 8653 // If the context is an invalid C++ class, just suppress these checks. 8654 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8655 if (Record->isInvalidDecl()) { 8656 DelayedDefaultedMemberExceptionSpecs.clear(); 8657 DelayedDestructorExceptionSpecChecks.clear(); 8658 return; 8659 } 8660 } 8661 } 8662 8663 void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8664 CXXDestructorDecl *Destructor) { 8665 assert(getLangOpts().CPlusPlus11 && 8666 "adjusting dtor exception specs was introduced in c++11"); 8667 8668 // C++11 [class.dtor]p3: 8669 // A declaration of a destructor that does not have an exception- 8670 // specification is implicitly considered to have the same exception- 8671 // specification as an implicit declaration. 8672 const FunctionProtoType *DtorType = Destructor->getType()-> 8673 getAs<FunctionProtoType>(); 8674 if (DtorType->hasExceptionSpec()) 8675 return; 8676 8677 // Replace the destructor's type, building off the existing one. Fortunately, 8678 // the only thing of interest in the destructor type is its extended info. 8679 // The return and arguments are fixed. 8680 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8681 EPI.ExceptionSpecType = EST_Unevaluated; 8682 EPI.ExceptionSpecDecl = Destructor; 8683 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8684 8685 // FIXME: If the destructor has a body that could throw, and the newly created 8686 // spec doesn't allow exceptions, we should emit a warning, because this 8687 // change in behavior can break conforming C++03 programs at runtime. 8688 // However, we don't have a body or an exception specification yet, so it 8689 // needs to be done somewhere else. 8690 } 8691 8692 namespace { 8693 /// \brief An abstract base class for all helper classes used in building the 8694 // copy/move operators. These classes serve as factory functions and help us 8695 // avoid using the same Expr* in the AST twice. 8696 class ExprBuilder { 8697 ExprBuilder(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8698 ExprBuilder &operator=(const ExprBuilder&) LLVM_DELETED_FUNCTION; 8699 8700 protected: 8701 static Expr *assertNotNull(Expr *E) { 8702 assert(E && "Expression construction must not fail."); 8703 return E; 8704 } 8705 8706 public: 8707 ExprBuilder() {} 8708 virtual ~ExprBuilder() {} 8709 8710 virtual Expr *build(Sema &S, SourceLocation Loc) const = 0; 8711 }; 8712 8713 class RefBuilder: public ExprBuilder { 8714 VarDecl *Var; 8715 QualType VarType; 8716 8717 public: 8718 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8719 return assertNotNull(S.BuildDeclRefExpr(Var, VarType, VK_LValue, Loc).take()); 8720 } 8721 8722 RefBuilder(VarDecl *Var, QualType VarType) 8723 : Var(Var), VarType(VarType) {} 8724 }; 8725 8726 class ThisBuilder: public ExprBuilder { 8727 public: 8728 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8729 return assertNotNull(S.ActOnCXXThis(Loc).takeAs<Expr>()); 8730 } 8731 }; 8732 8733 class CastBuilder: public ExprBuilder { 8734 const ExprBuilder &Builder; 8735 QualType Type; 8736 ExprValueKind Kind; 8737 const CXXCastPath &Path; 8738 8739 public: 8740 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8741 return assertNotNull(S.ImpCastExprToType(Builder.build(S, Loc), Type, 8742 CK_UncheckedDerivedToBase, Kind, 8743 &Path).take()); 8744 } 8745 8746 CastBuilder(const ExprBuilder &Builder, QualType Type, ExprValueKind Kind, 8747 const CXXCastPath &Path) 8748 : Builder(Builder), Type(Type), Kind(Kind), Path(Path) {} 8749 }; 8750 8751 class DerefBuilder: public ExprBuilder { 8752 const ExprBuilder &Builder; 8753 8754 public: 8755 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8756 return assertNotNull( 8757 S.CreateBuiltinUnaryOp(Loc, UO_Deref, Builder.build(S, Loc)).take()); 8758 } 8759 8760 DerefBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8761 }; 8762 8763 class MemberBuilder: public ExprBuilder { 8764 const ExprBuilder &Builder; 8765 QualType Type; 8766 CXXScopeSpec SS; 8767 bool IsArrow; 8768 LookupResult &MemberLookup; 8769 8770 public: 8771 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8772 return assertNotNull(S.BuildMemberReferenceExpr( 8773 Builder.build(S, Loc), Type, Loc, IsArrow, SS, SourceLocation(), 0, 8774 MemberLookup, 0).take()); 8775 } 8776 8777 MemberBuilder(const ExprBuilder &Builder, QualType Type, bool IsArrow, 8778 LookupResult &MemberLookup) 8779 : Builder(Builder), Type(Type), IsArrow(IsArrow), 8780 MemberLookup(MemberLookup) {} 8781 }; 8782 8783 class MoveCastBuilder: public ExprBuilder { 8784 const ExprBuilder &Builder; 8785 8786 public: 8787 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8788 return assertNotNull(CastForMoving(S, Builder.build(S, Loc))); 8789 } 8790 8791 MoveCastBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8792 }; 8793 8794 class LvalueConvBuilder: public ExprBuilder { 8795 const ExprBuilder &Builder; 8796 8797 public: 8798 virtual Expr *build(Sema &S, SourceLocation Loc) const LLVM_OVERRIDE { 8799 return assertNotNull( 8800 S.DefaultLvalueConversion(Builder.build(S, Loc)).take()); 8801 } 8802 8803 LvalueConvBuilder(const ExprBuilder &Builder) : Builder(Builder) {} 8804 }; 8805 8806 class SubscriptBuilder: public ExprBuilder { 8807 const ExprBuilder &Base; 8808 const ExprBuilder &Index; 8809 8810 public: 8811 virtual Expr *build(Sema &S, SourceLocation Loc) const 8812 LLVM_OVERRIDE { 8813 return assertNotNull(S.CreateBuiltinArraySubscriptExpr( 8814 Base.build(S, Loc), Loc, Index.build(S, Loc), Loc).take()); 8815 } 8816 8817 SubscriptBuilder(const ExprBuilder &Base, const ExprBuilder &Index) 8818 : Base(Base), Index(Index) {} 8819 }; 8820 8821 } // end anonymous namespace 8822 8823 /// When generating a defaulted copy or move assignment operator, if a field 8824 /// should be copied with __builtin_memcpy rather than via explicit assignments, 8825 /// do so. This optimization only applies for arrays of scalars, and for arrays 8826 /// of class type where the selected copy/move-assignment operator is trivial. 8827 static StmtResult 8828 buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8829 const ExprBuilder &ToB, const ExprBuilder &FromB) { 8830 // Compute the size of the memory buffer to be copied. 8831 QualType SizeType = S.Context.getSizeType(); 8832 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8833 S.Context.getTypeSizeInChars(T).getQuantity()); 8834 8835 // Take the address of the field references for "from" and "to". We 8836 // directly construct UnaryOperators here because semantic analysis 8837 // does not permit us to take the address of an xvalue. 8838 Expr *From = FromB.build(S, Loc); 8839 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8840 S.Context.getPointerType(From->getType()), 8841 VK_RValue, OK_Ordinary, Loc); 8842 Expr *To = ToB.build(S, Loc); 8843 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8844 S.Context.getPointerType(To->getType()), 8845 VK_RValue, OK_Ordinary, Loc); 8846 8847 const Type *E = T->getBaseElementTypeUnsafe(); 8848 bool NeedsCollectableMemCpy = 8849 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8850 8851 // Create a reference to the __builtin_objc_memmove_collectable function 8852 StringRef MemCpyName = NeedsCollectableMemCpy ? 8853 "__builtin_objc_memmove_collectable" : 8854 "__builtin_memcpy"; 8855 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8856 Sema::LookupOrdinaryName); 8857 S.LookupName(R, S.TUScope, true); 8858 8859 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8860 if (!MemCpy) 8861 // Something went horribly wrong earlier, and we will have complained 8862 // about it. 8863 return StmtError(); 8864 8865 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8866 VK_RValue, Loc, 0); 8867 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8868 8869 Expr *CallArgs[] = { 8870 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8871 }; 8872 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8873 Loc, CallArgs, Loc); 8874 8875 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8876 return S.Owned(Call.takeAs<Stmt>()); 8877 } 8878 8879 /// \brief Builds a statement that copies/moves the given entity from \p From to 8880 /// \c To. 8881 /// 8882 /// This routine is used to copy/move the members of a class with an 8883 /// implicitly-declared copy/move assignment operator. When the entities being 8884 /// copied are arrays, this routine builds for loops to copy them. 8885 /// 8886 /// \param S The Sema object used for type-checking. 8887 /// 8888 /// \param Loc The location where the implicit copy/move is being generated. 8889 /// 8890 /// \param T The type of the expressions being copied/moved. Both expressions 8891 /// must have this type. 8892 /// 8893 /// \param To The expression we are copying/moving to. 8894 /// 8895 /// \param From The expression we are copying/moving from. 8896 /// 8897 /// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8898 /// Otherwise, it's a non-static member subobject. 8899 /// 8900 /// \param Copying Whether we're copying or moving. 8901 /// 8902 /// \param Depth Internal parameter recording the depth of the recursion. 8903 /// 8904 /// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8905 /// if a memcpy should be used instead. 8906 static StmtResult 8907 buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8908 const ExprBuilder &To, const ExprBuilder &From, 8909 bool CopyingBaseSubobject, bool Copying, 8910 unsigned Depth = 0) { 8911 // C++11 [class.copy]p28: 8912 // Each subobject is assigned in the manner appropriate to its type: 8913 // 8914 // - if the subobject is of class type, as if by a call to operator= with 8915 // the subobject as the object expression and the corresponding 8916 // subobject of x as a single function argument (as if by explicit 8917 // qualification; that is, ignoring any possible virtual overriding 8918 // functions in more derived classes); 8919 // 8920 // C++03 [class.copy]p13: 8921 // - if the subobject is of class type, the copy assignment operator for 8922 // the class is used (as if by explicit qualification; that is, 8923 // ignoring any possible virtual overriding functions in more derived 8924 // classes); 8925 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8926 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8927 8928 // Look for operator=. 8929 DeclarationName Name 8930 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8931 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8932 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8933 8934 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8935 // operator. 8936 if (!S.getLangOpts().CPlusPlus11) { 8937 LookupResult::Filter F = OpLookup.makeFilter(); 8938 while (F.hasNext()) { 8939 NamedDecl *D = F.next(); 8940 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8941 if (Method->isCopyAssignmentOperator() || 8942 (!Copying && Method->isMoveAssignmentOperator())) 8943 continue; 8944 8945 F.erase(); 8946 } 8947 F.done(); 8948 } 8949 8950 // Suppress the protected check (C++ [class.protected]) for each of the 8951 // assignment operators we found. This strange dance is required when 8952 // we're assigning via a base classes's copy-assignment operator. To 8953 // ensure that we're getting the right base class subobject (without 8954 // ambiguities), we need to cast "this" to that subobject type; to 8955 // ensure that we don't go through the virtual call mechanism, we need 8956 // to qualify the operator= name with the base class (see below). However, 8957 // this means that if the base class has a protected copy assignment 8958 // operator, the protected member access check will fail. So, we 8959 // rewrite "protected" access to "public" access in this case, since we 8960 // know by construction that we're calling from a derived class. 8961 if (CopyingBaseSubobject) { 8962 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8963 L != LEnd; ++L) { 8964 if (L.getAccess() == AS_protected) 8965 L.setAccess(AS_public); 8966 } 8967 } 8968 8969 // Create the nested-name-specifier that will be used to qualify the 8970 // reference to operator=; this is required to suppress the virtual 8971 // call mechanism. 8972 CXXScopeSpec SS; 8973 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8974 SS.MakeTrivial(S.Context, 8975 NestedNameSpecifier::Create(S.Context, 0, false, 8976 CanonicalT), 8977 Loc); 8978 8979 // Create the reference to operator=. 8980 ExprResult OpEqualRef 8981 = S.BuildMemberReferenceExpr(To.build(S, Loc), T, Loc, /*isArrow=*/false, 8982 SS, /*TemplateKWLoc=*/SourceLocation(), 8983 /*FirstQualifierInScope=*/0, 8984 OpLookup, 8985 /*TemplateArgs=*/0, 8986 /*SuppressQualifierCheck=*/true); 8987 if (OpEqualRef.isInvalid()) 8988 return StmtError(); 8989 8990 // Build the call to the assignment operator. 8991 8992 Expr *FromInst = From.build(S, Loc); 8993 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8994 OpEqualRef.takeAs<Expr>(), 8995 Loc, FromInst, Loc); 8996 if (Call.isInvalid()) 8997 return StmtError(); 8998 8999 // If we built a call to a trivial 'operator=' while copying an array, 9000 // bail out. We'll replace the whole shebang with a memcpy. 9001 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 9002 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 9003 return StmtResult((Stmt*)0); 9004 9005 // Convert to an expression-statement, and clean up any produced 9006 // temporaries. 9007 return S.ActOnExprStmt(Call); 9008 } 9009 9010 // - if the subobject is of scalar type, the built-in assignment 9011 // operator is used. 9012 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 9013 if (!ArrayTy) { 9014 ExprResult Assignment = S.CreateBuiltinBinOp( 9015 Loc, BO_Assign, To.build(S, Loc), From.build(S, Loc)); 9016 if (Assignment.isInvalid()) 9017 return StmtError(); 9018 return S.ActOnExprStmt(Assignment); 9019 } 9020 9021 // - if the subobject is an array, each element is assigned, in the 9022 // manner appropriate to the element type; 9023 9024 // Construct a loop over the array bounds, e.g., 9025 // 9026 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 9027 // 9028 // that will copy each of the array elements. 9029 QualType SizeType = S.Context.getSizeType(); 9030 9031 // Create the iteration variable. 9032 IdentifierInfo *IterationVarName = 0; 9033 { 9034 SmallString<8> Str; 9035 llvm::raw_svector_ostream OS(Str); 9036 OS << "__i" << Depth; 9037 IterationVarName = &S.Context.Idents.get(OS.str()); 9038 } 9039 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 9040 IterationVarName, SizeType, 9041 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 9042 SC_None); 9043 9044 // Initialize the iteration variable to zero. 9045 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 9046 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 9047 9048 // Creates a reference to the iteration variable. 9049 RefBuilder IterationVarRef(IterationVar, SizeType); 9050 LvalueConvBuilder IterationVarRefRVal(IterationVarRef); 9051 9052 // Create the DeclStmt that holds the iteration variable. 9053 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 9054 9055 // Subscript the "from" and "to" expressions with the iteration variable. 9056 SubscriptBuilder FromIndexCopy(From, IterationVarRefRVal); 9057 MoveCastBuilder FromIndexMove(FromIndexCopy); 9058 const ExprBuilder *FromIndex; 9059 if (Copying) 9060 FromIndex = &FromIndexCopy; 9061 else 9062 FromIndex = &FromIndexMove; 9063 9064 SubscriptBuilder ToIndex(To, IterationVarRefRVal); 9065 9066 // Build the copy/move for an individual element of the array. 9067 StmtResult Copy = 9068 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 9069 ToIndex, *FromIndex, CopyingBaseSubobject, 9070 Copying, Depth + 1); 9071 // Bail out if copying fails or if we determined that we should use memcpy. 9072 if (Copy.isInvalid() || !Copy.get()) 9073 return Copy; 9074 9075 // Create the comparison against the array bound. 9076 llvm::APInt Upper 9077 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 9078 Expr *Comparison 9079 = new (S.Context) BinaryOperator(IterationVarRefRVal.build(S, Loc), 9080 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 9081 BO_NE, S.Context.BoolTy, 9082 VK_RValue, OK_Ordinary, Loc, false); 9083 9084 // Create the pre-increment of the iteration variable. 9085 Expr *Increment 9086 = new (S.Context) UnaryOperator(IterationVarRef.build(S, Loc), UO_PreInc, 9087 SizeType, VK_LValue, OK_Ordinary, Loc); 9088 9089 // Construct the loop that copies all elements of this array. 9090 return S.ActOnForStmt(Loc, Loc, InitStmt, 9091 S.MakeFullExpr(Comparison), 9092 0, S.MakeFullDiscardedValueExpr(Increment), 9093 Loc, Copy.take()); 9094 } 9095 9096 static StmtResult 9097 buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 9098 const ExprBuilder &To, const ExprBuilder &From, 9099 bool CopyingBaseSubobject, bool Copying) { 9100 // Maybe we should use a memcpy? 9101 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 9102 T.isTriviallyCopyableType(S.Context)) 9103 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 9104 9105 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 9106 CopyingBaseSubobject, 9107 Copying, 0)); 9108 9109 // If we ended up picking a trivial assignment operator for an array of a 9110 // non-trivially-copyable class type, just emit a memcpy. 9111 if (!Result.isInvalid() && !Result.get()) 9112 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 9113 9114 return Result; 9115 } 9116 9117 Sema::ImplicitExceptionSpecification 9118 Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 9119 CXXRecordDecl *ClassDecl = MD->getParent(); 9120 9121 ImplicitExceptionSpecification ExceptSpec(*this); 9122 if (ClassDecl->isInvalidDecl()) 9123 return ExceptSpec; 9124 9125 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9126 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 9127 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9128 9129 // C++ [except.spec]p14: 9130 // An implicitly declared special member function (Clause 12) shall have an 9131 // exception-specification. [...] 9132 9133 // It is unspecified whether or not an implicit copy assignment operator 9134 // attempts to deduplicate calls to assignment operators of virtual bases are 9135 // made. As such, this exception specification is effectively unspecified. 9136 // Based on a similar decision made for constness in C++0x, we're erring on 9137 // the side of assuming such calls to be made regardless of whether they 9138 // actually happen. 9139 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9140 BaseEnd = ClassDecl->bases_end(); 9141 Base != BaseEnd; ++Base) { 9142 if (Base->isVirtual()) 9143 continue; 9144 9145 CXXRecordDecl *BaseClassDecl 9146 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9147 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9148 ArgQuals, false, 0)) 9149 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9150 } 9151 9152 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9153 BaseEnd = ClassDecl->vbases_end(); 9154 Base != BaseEnd; ++Base) { 9155 CXXRecordDecl *BaseClassDecl 9156 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9157 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 9158 ArgQuals, false, 0)) 9159 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 9160 } 9161 9162 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9163 FieldEnd = ClassDecl->field_end(); 9164 Field != FieldEnd; 9165 ++Field) { 9166 QualType FieldType = Context.getBaseElementType(Field->getType()); 9167 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9168 if (CXXMethodDecl *CopyAssign = 9169 LookupCopyingAssignment(FieldClassDecl, 9170 ArgQuals | FieldType.getCVRQualifiers(), 9171 false, 0)) 9172 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 9173 } 9174 } 9175 9176 return ExceptSpec; 9177 } 9178 9179 CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 9180 // Note: The following rules are largely analoguous to the copy 9181 // constructor rules. Note that virtual bases are not taken into account 9182 // for determining the argument type of the operator. Note also that 9183 // operators taking an object instead of a reference are allowed. 9184 assert(ClassDecl->needsImplicitCopyAssignment()); 9185 9186 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 9187 if (DSM.isAlreadyBeingDeclared()) 9188 return 0; 9189 9190 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9191 QualType RetType = Context.getLValueReferenceType(ArgType); 9192 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 9193 if (Const) 9194 ArgType = ArgType.withConst(); 9195 ArgType = Context.getLValueReferenceType(ArgType); 9196 9197 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9198 CXXCopyAssignment, 9199 Const); 9200 9201 // An implicitly-declared copy assignment operator is an inline public 9202 // member of its class. 9203 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9204 SourceLocation ClassLoc = ClassDecl->getLocation(); 9205 DeclarationNameInfo NameInfo(Name, ClassLoc); 9206 CXXMethodDecl *CopyAssignment = 9207 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9208 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 9209 /*isInline=*/ true, Constexpr, SourceLocation()); 9210 CopyAssignment->setAccess(AS_public); 9211 CopyAssignment->setDefaulted(); 9212 CopyAssignment->setImplicit(); 9213 9214 // Build an exception specification pointing back at this member. 9215 FunctionProtoType::ExtProtoInfo EPI = 9216 getImplicitMethodEPI(*this, CopyAssignment); 9217 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9218 9219 // Add the parameter to the operator. 9220 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 9221 ClassLoc, ClassLoc, /*Id=*/0, 9222 ArgType, /*TInfo=*/0, 9223 SC_None, 0); 9224 CopyAssignment->setParams(FromParam); 9225 9226 AddOverriddenMethods(ClassDecl, CopyAssignment); 9227 9228 CopyAssignment->setTrivial( 9229 ClassDecl->needsOverloadResolutionForCopyAssignment() 9230 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 9231 : ClassDecl->hasTrivialCopyAssignment()); 9232 9233 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 9234 SetDeclDeleted(CopyAssignment, ClassLoc); 9235 9236 // Note that we have added this copy-assignment operator. 9237 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 9238 9239 if (Scope *S = getScopeForContext(ClassDecl)) 9240 PushOnScopeChains(CopyAssignment, S, false); 9241 ClassDecl->addDecl(CopyAssignment); 9242 9243 return CopyAssignment; 9244 } 9245 9246 /// Diagnose an implicit copy operation for a class which is odr-used, but 9247 /// which is deprecated because the class has a user-declared copy constructor, 9248 /// copy assignment operator, or destructor. 9249 static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 9250 SourceLocation UseLoc) { 9251 assert(CopyOp->isImplicit()); 9252 9253 CXXRecordDecl *RD = CopyOp->getParent(); 9254 CXXMethodDecl *UserDeclaredOperation = 0; 9255 9256 // In Microsoft mode, assignment operations don't affect constructors and 9257 // vice versa. 9258 if (RD->hasUserDeclaredDestructor()) { 9259 UserDeclaredOperation = RD->getDestructor(); 9260 } else if (!isa<CXXConstructorDecl>(CopyOp) && 9261 RD->hasUserDeclaredCopyConstructor() && 9262 !S.getLangOpts().MicrosoftMode) { 9263 // Find any user-declared copy constructor. 9264 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 9265 E = RD->ctor_end(); I != E; ++I) { 9266 if (I->isCopyConstructor()) { 9267 UserDeclaredOperation = *I; 9268 break; 9269 } 9270 } 9271 assert(UserDeclaredOperation); 9272 } else if (isa<CXXConstructorDecl>(CopyOp) && 9273 RD->hasUserDeclaredCopyAssignment() && 9274 !S.getLangOpts().MicrosoftMode) { 9275 // Find any user-declared move assignment operator. 9276 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 9277 E = RD->method_end(); I != E; ++I) { 9278 if (I->isCopyAssignmentOperator()) { 9279 UserDeclaredOperation = *I; 9280 break; 9281 } 9282 } 9283 assert(UserDeclaredOperation); 9284 } 9285 9286 if (UserDeclaredOperation) { 9287 S.Diag(UserDeclaredOperation->getLocation(), 9288 diag::warn_deprecated_copy_operation) 9289 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 9290 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 9291 S.Diag(UseLoc, diag::note_member_synthesized_at) 9292 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 9293 : Sema::CXXCopyAssignment) 9294 << RD; 9295 } 9296 } 9297 9298 void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 9299 CXXMethodDecl *CopyAssignOperator) { 9300 assert((CopyAssignOperator->isDefaulted() && 9301 CopyAssignOperator->isOverloadedOperator() && 9302 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 9303 !CopyAssignOperator->doesThisDeclarationHaveABody() && 9304 !CopyAssignOperator->isDeleted()) && 9305 "DefineImplicitCopyAssignment called for wrong function"); 9306 9307 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 9308 9309 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 9310 CopyAssignOperator->setInvalidDecl(); 9311 return; 9312 } 9313 9314 // C++11 [class.copy]p18: 9315 // The [definition of an implicitly declared copy assignment operator] is 9316 // deprecated if the class has a user-declared copy constructor or a 9317 // user-declared destructor. 9318 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 9319 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 9320 9321 CopyAssignOperator->markUsed(Context); 9322 9323 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 9324 DiagnosticErrorTrap Trap(Diags); 9325 9326 // C++0x [class.copy]p30: 9327 // The implicitly-defined or explicitly-defaulted copy assignment operator 9328 // for a non-union class X performs memberwise copy assignment of its 9329 // subobjects. The direct base classes of X are assigned first, in the 9330 // order of their declaration in the base-specifier-list, and then the 9331 // immediate non-static data members of X are assigned, in the order in 9332 // which they were declared in the class definition. 9333 9334 // The statements that form the synthesized function body. 9335 SmallVector<Stmt*, 8> Statements; 9336 9337 // The parameter for the "other" object, which we are copying from. 9338 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 9339 Qualifiers OtherQuals = Other->getType().getQualifiers(); 9340 QualType OtherRefType = Other->getType(); 9341 if (const LValueReferenceType *OtherRef 9342 = OtherRefType->getAs<LValueReferenceType>()) { 9343 OtherRefType = OtherRef->getPointeeType(); 9344 OtherQuals = OtherRefType.getQualifiers(); 9345 } 9346 9347 // Our location for everything implicitly-generated. 9348 SourceLocation Loc = CopyAssignOperator->getLocation(); 9349 9350 // Builds a DeclRefExpr for the "other" object. 9351 RefBuilder OtherRef(Other, OtherRefType); 9352 9353 // Builds the "this" pointer. 9354 ThisBuilder This; 9355 9356 // Assign base classes. 9357 bool Invalid = false; 9358 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9359 E = ClassDecl->bases_end(); Base != E; ++Base) { 9360 // Form the assignment: 9361 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 9362 QualType BaseType = Base->getType().getUnqualifiedType(); 9363 if (!BaseType->isRecordType()) { 9364 Invalid = true; 9365 continue; 9366 } 9367 9368 CXXCastPath BasePath; 9369 BasePath.push_back(Base); 9370 9371 // Construct the "from" expression, which is an implicit cast to the 9372 // appropriately-qualified base type. 9373 CastBuilder From(OtherRef, Context.getQualifiedType(BaseType, OtherQuals), 9374 VK_LValue, BasePath); 9375 9376 // Dereference "this". 9377 DerefBuilder DerefThis(This); 9378 CastBuilder To(DerefThis, 9379 Context.getCVRQualifiedType( 9380 BaseType, CopyAssignOperator->getTypeQualifiers()), 9381 VK_LValue, BasePath); 9382 9383 // Build the copy. 9384 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 9385 To, From, 9386 /*CopyingBaseSubobject=*/true, 9387 /*Copying=*/true); 9388 if (Copy.isInvalid()) { 9389 Diag(CurrentLocation, diag::note_member_synthesized_at) 9390 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9391 CopyAssignOperator->setInvalidDecl(); 9392 return; 9393 } 9394 9395 // Success! Record the copy. 9396 Statements.push_back(Copy.takeAs<Expr>()); 9397 } 9398 9399 // Assign non-static members. 9400 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9401 FieldEnd = ClassDecl->field_end(); 9402 Field != FieldEnd; ++Field) { 9403 if (Field->isUnnamedBitfield()) 9404 continue; 9405 9406 if (Field->isInvalidDecl()) { 9407 Invalid = true; 9408 continue; 9409 } 9410 9411 // Check for members of reference type; we can't copy those. 9412 if (Field->getType()->isReferenceType()) { 9413 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9414 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9415 Diag(Field->getLocation(), diag::note_declared_at); 9416 Diag(CurrentLocation, diag::note_member_synthesized_at) 9417 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9418 Invalid = true; 9419 continue; 9420 } 9421 9422 // Check for members of const-qualified, non-class type. 9423 QualType BaseType = Context.getBaseElementType(Field->getType()); 9424 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9425 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9426 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9427 Diag(Field->getLocation(), diag::note_declared_at); 9428 Diag(CurrentLocation, diag::note_member_synthesized_at) 9429 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9430 Invalid = true; 9431 continue; 9432 } 9433 9434 // Suppress assigning zero-width bitfields. 9435 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9436 continue; 9437 9438 QualType FieldType = Field->getType().getNonReferenceType(); 9439 if (FieldType->isIncompleteArrayType()) { 9440 assert(ClassDecl->hasFlexibleArrayMember() && 9441 "Incomplete array type is not valid"); 9442 continue; 9443 } 9444 9445 // Build references to the field in the object we're copying from and to. 9446 CXXScopeSpec SS; // Intentionally empty 9447 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9448 LookupMemberName); 9449 MemberLookup.addDecl(*Field); 9450 MemberLookup.resolveKind(); 9451 9452 MemberBuilder From(OtherRef, OtherRefType, /*IsArrow=*/false, MemberLookup); 9453 9454 MemberBuilder To(This, getCurrentThisType(), /*IsArrow=*/true, MemberLookup); 9455 9456 // Build the copy of this field. 9457 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9458 To, From, 9459 /*CopyingBaseSubobject=*/false, 9460 /*Copying=*/true); 9461 if (Copy.isInvalid()) { 9462 Diag(CurrentLocation, diag::note_member_synthesized_at) 9463 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9464 CopyAssignOperator->setInvalidDecl(); 9465 return; 9466 } 9467 9468 // Success! Record the copy. 9469 Statements.push_back(Copy.takeAs<Stmt>()); 9470 } 9471 9472 if (!Invalid) { 9473 // Add a "return *this;" 9474 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9475 9476 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9477 if (Return.isInvalid()) 9478 Invalid = true; 9479 else { 9480 Statements.push_back(Return.takeAs<Stmt>()); 9481 9482 if (Trap.hasErrorOccurred()) { 9483 Diag(CurrentLocation, diag::note_member_synthesized_at) 9484 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9485 Invalid = true; 9486 } 9487 } 9488 } 9489 9490 if (Invalid) { 9491 CopyAssignOperator->setInvalidDecl(); 9492 return; 9493 } 9494 9495 StmtResult Body; 9496 { 9497 CompoundScopeRAII CompoundScope(*this); 9498 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9499 /*isStmtExpr=*/false); 9500 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9501 } 9502 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9503 9504 if (ASTMutationListener *L = getASTMutationListener()) { 9505 L->CompletedImplicitDefinition(CopyAssignOperator); 9506 } 9507 } 9508 9509 Sema::ImplicitExceptionSpecification 9510 Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9511 CXXRecordDecl *ClassDecl = MD->getParent(); 9512 9513 ImplicitExceptionSpecification ExceptSpec(*this); 9514 if (ClassDecl->isInvalidDecl()) 9515 return ExceptSpec; 9516 9517 // C++0x [except.spec]p14: 9518 // An implicitly declared special member function (Clause 12) shall have an 9519 // exception-specification. [...] 9520 9521 // It is unspecified whether or not an implicit move assignment operator 9522 // attempts to deduplicate calls to assignment operators of virtual bases are 9523 // made. As such, this exception specification is effectively unspecified. 9524 // Based on a similar decision made for constness in C++0x, we're erring on 9525 // the side of assuming such calls to be made regardless of whether they 9526 // actually happen. 9527 // Note that a move constructor is not implicitly declared when there are 9528 // virtual bases, but it can still be user-declared and explicitly defaulted. 9529 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9530 BaseEnd = ClassDecl->bases_end(); 9531 Base != BaseEnd; ++Base) { 9532 if (Base->isVirtual()) 9533 continue; 9534 9535 CXXRecordDecl *BaseClassDecl 9536 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9537 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9538 0, false, 0)) 9539 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9540 } 9541 9542 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9543 BaseEnd = ClassDecl->vbases_end(); 9544 Base != BaseEnd; ++Base) { 9545 CXXRecordDecl *BaseClassDecl 9546 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9547 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9548 0, false, 0)) 9549 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9550 } 9551 9552 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9553 FieldEnd = ClassDecl->field_end(); 9554 Field != FieldEnd; 9555 ++Field) { 9556 QualType FieldType = Context.getBaseElementType(Field->getType()); 9557 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9558 if (CXXMethodDecl *MoveAssign = 9559 LookupMovingAssignment(FieldClassDecl, 9560 FieldType.getCVRQualifiers(), 9561 false, 0)) 9562 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9563 } 9564 } 9565 9566 return ExceptSpec; 9567 } 9568 9569 CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9570 assert(ClassDecl->needsImplicitMoveAssignment()); 9571 9572 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9573 if (DSM.isAlreadyBeingDeclared()) 9574 return 0; 9575 9576 // Note: The following rules are largely analoguous to the move 9577 // constructor rules. 9578 9579 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9580 QualType RetType = Context.getLValueReferenceType(ArgType); 9581 ArgType = Context.getRValueReferenceType(ArgType); 9582 9583 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9584 CXXMoveAssignment, 9585 false); 9586 9587 // An implicitly-declared move assignment operator is an inline public 9588 // member of its class. 9589 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9590 SourceLocation ClassLoc = ClassDecl->getLocation(); 9591 DeclarationNameInfo NameInfo(Name, ClassLoc); 9592 CXXMethodDecl *MoveAssignment = 9593 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9594 /*TInfo=*/0, /*StorageClass=*/SC_None, 9595 /*isInline=*/true, Constexpr, SourceLocation()); 9596 MoveAssignment->setAccess(AS_public); 9597 MoveAssignment->setDefaulted(); 9598 MoveAssignment->setImplicit(); 9599 9600 // Build an exception specification pointing back at this member. 9601 FunctionProtoType::ExtProtoInfo EPI = 9602 getImplicitMethodEPI(*this, MoveAssignment); 9603 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9604 9605 // Add the parameter to the operator. 9606 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9607 ClassLoc, ClassLoc, /*Id=*/0, 9608 ArgType, /*TInfo=*/0, 9609 SC_None, 0); 9610 MoveAssignment->setParams(FromParam); 9611 9612 AddOverriddenMethods(ClassDecl, MoveAssignment); 9613 9614 MoveAssignment->setTrivial( 9615 ClassDecl->needsOverloadResolutionForMoveAssignment() 9616 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9617 : ClassDecl->hasTrivialMoveAssignment()); 9618 9619 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9620 ClassDecl->setImplicitMoveAssignmentIsDeleted(); 9621 SetDeclDeleted(MoveAssignment, ClassLoc); 9622 } 9623 9624 // Note that we have added this copy-assignment operator. 9625 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9626 9627 if (Scope *S = getScopeForContext(ClassDecl)) 9628 PushOnScopeChains(MoveAssignment, S, false); 9629 ClassDecl->addDecl(MoveAssignment); 9630 9631 return MoveAssignment; 9632 } 9633 9634 /// Check if we're implicitly defining a move assignment operator for a class 9635 /// with virtual bases. Such a move assignment might move-assign the virtual 9636 /// base multiple times. 9637 static void checkMoveAssignmentForRepeatedMove(Sema &S, CXXRecordDecl *Class, 9638 SourceLocation CurrentLocation) { 9639 assert(!Class->isDependentContext() && "should not define dependent move"); 9640 9641 // Only a virtual base could get implicitly move-assigned multiple times. 9642 // Only a non-trivial move assignment can observe this. We only want to 9643 // diagnose if we implicitly define an assignment operator that assigns 9644 // two base classes, both of which move-assign the same virtual base. 9645 if (Class->getNumVBases() == 0 || Class->hasTrivialMoveAssignment() || 9646 Class->getNumBases() < 2) 9647 return; 9648 9649 llvm::SmallVector<CXXBaseSpecifier *, 16> Worklist; 9650 typedef llvm::DenseMap<CXXRecordDecl*, CXXBaseSpecifier*> VBaseMap; 9651 VBaseMap VBases; 9652 9653 for (CXXRecordDecl::base_class_iterator BI = Class->bases_begin(), 9654 BE = Class->bases_end(); 9655 BI != BE; ++BI) { 9656 Worklist.push_back(&*BI); 9657 while (!Worklist.empty()) { 9658 CXXBaseSpecifier *BaseSpec = Worklist.pop_back_val(); 9659 CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 9660 9661 // If the base has no non-trivial move assignment operators, 9662 // we don't care about moves from it. 9663 if (!Base->hasNonTrivialMoveAssignment()) 9664 continue; 9665 9666 // If there's nothing virtual here, skip it. 9667 if (!BaseSpec->isVirtual() && !Base->getNumVBases()) 9668 continue; 9669 9670 // If we're not actually going to call a move assignment for this base, 9671 // or the selected move assignment is trivial, skip it. 9672 Sema::SpecialMemberOverloadResult *SMOR = 9673 S.LookupSpecialMember(Base, Sema::CXXMoveAssignment, 9674 /*ConstArg*/false, /*VolatileArg*/false, 9675 /*RValueThis*/true, /*ConstThis*/false, 9676 /*VolatileThis*/false); 9677 if (!SMOR->getMethod() || SMOR->getMethod()->isTrivial() || 9678 !SMOR->getMethod()->isMoveAssignmentOperator()) 9679 continue; 9680 9681 if (BaseSpec->isVirtual()) { 9682 // We're going to move-assign this virtual base, and its move 9683 // assignment operator is not trivial. If this can happen for 9684 // multiple distinct direct bases of Class, diagnose it. (If it 9685 // only happens in one base, we'll diagnose it when synthesizing 9686 // that base class's move assignment operator.) 9687 CXXBaseSpecifier *&Existing = 9688 VBases.insert(std::make_pair(Base->getCanonicalDecl(), BI)) 9689 .first->second; 9690 if (Existing && Existing != BI) { 9691 S.Diag(CurrentLocation, diag::warn_vbase_moved_multiple_times) 9692 << Class << Base; 9693 S.Diag(Existing->getLocStart(), diag::note_vbase_moved_here) 9694 << (Base->getCanonicalDecl() == 9695 Existing->getType()->getAsCXXRecordDecl()->getCanonicalDecl()) 9696 << Base << Existing->getType() << Existing->getSourceRange(); 9697 S.Diag(BI->getLocStart(), diag::note_vbase_moved_here) 9698 << (Base->getCanonicalDecl() == 9699 BI->getType()->getAsCXXRecordDecl()->getCanonicalDecl()) 9700 << Base << BI->getType() << BaseSpec->getSourceRange(); 9701 9702 // Only diagnose each vbase once. 9703 Existing = 0; 9704 } 9705 } else { 9706 // Only walk over bases that have defaulted move assignment operators. 9707 // We assume that any user-provided move assignment operator handles 9708 // the multiple-moves-of-vbase case itself somehow. 9709 if (!SMOR->getMethod()->isDefaulted()) 9710 continue; 9711 9712 // We're going to move the base classes of Base. Add them to the list. 9713 for (CXXRecordDecl::base_class_iterator BI = Base->bases_begin(), 9714 BE = Base->bases_end(); 9715 BI != BE; ++BI) 9716 Worklist.push_back(&*BI); 9717 } 9718 } 9719 } 9720 } 9721 9722 void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9723 CXXMethodDecl *MoveAssignOperator) { 9724 assert((MoveAssignOperator->isDefaulted() && 9725 MoveAssignOperator->isOverloadedOperator() && 9726 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9727 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9728 !MoveAssignOperator->isDeleted()) && 9729 "DefineImplicitMoveAssignment called for wrong function"); 9730 9731 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9732 9733 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9734 MoveAssignOperator->setInvalidDecl(); 9735 return; 9736 } 9737 9738 MoveAssignOperator->markUsed(Context); 9739 9740 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9741 DiagnosticErrorTrap Trap(Diags); 9742 9743 // C++0x [class.copy]p28: 9744 // The implicitly-defined or move assignment operator for a non-union class 9745 // X performs memberwise move assignment of its subobjects. The direct base 9746 // classes of X are assigned first, in the order of their declaration in the 9747 // base-specifier-list, and then the immediate non-static data members of X 9748 // are assigned, in the order in which they were declared in the class 9749 // definition. 9750 9751 // Issue a warning if our implicit move assignment operator will move 9752 // from a virtual base more than once. 9753 checkMoveAssignmentForRepeatedMove(*this, ClassDecl, CurrentLocation); 9754 9755 // The statements that form the synthesized function body. 9756 SmallVector<Stmt*, 8> Statements; 9757 9758 // The parameter for the "other" object, which we are move from. 9759 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9760 QualType OtherRefType = Other->getType()-> 9761 getAs<RValueReferenceType>()->getPointeeType(); 9762 assert(!OtherRefType.getQualifiers() && 9763 "Bad argument type of defaulted move assignment"); 9764 9765 // Our location for everything implicitly-generated. 9766 SourceLocation Loc = MoveAssignOperator->getLocation(); 9767 9768 // Builds a reference to the "other" object. 9769 RefBuilder OtherRef(Other, OtherRefType); 9770 // Cast to rvalue. 9771 MoveCastBuilder MoveOther(OtherRef); 9772 9773 // Builds the "this" pointer. 9774 ThisBuilder This; 9775 9776 // Assign base classes. 9777 bool Invalid = false; 9778 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9779 E = ClassDecl->bases_end(); Base != E; ++Base) { 9780 // C++11 [class.copy]p28: 9781 // It is unspecified whether subobjects representing virtual base classes 9782 // are assigned more than once by the implicitly-defined copy assignment 9783 // operator. 9784 // FIXME: Do not assign to a vbase that will be assigned by some other base 9785 // class. For a move-assignment, this can result in the vbase being moved 9786 // multiple times. 9787 9788 // Form the assignment: 9789 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9790 QualType BaseType = Base->getType().getUnqualifiedType(); 9791 if (!BaseType->isRecordType()) { 9792 Invalid = true; 9793 continue; 9794 } 9795 9796 CXXCastPath BasePath; 9797 BasePath.push_back(Base); 9798 9799 // Construct the "from" expression, which is an implicit cast to the 9800 // appropriately-qualified base type. 9801 CastBuilder From(OtherRef, BaseType, VK_XValue, BasePath); 9802 9803 // Dereference "this". 9804 DerefBuilder DerefThis(This); 9805 9806 // Implicitly cast "this" to the appropriately-qualified base type. 9807 CastBuilder To(DerefThis, 9808 Context.getCVRQualifiedType( 9809 BaseType, MoveAssignOperator->getTypeQualifiers()), 9810 VK_LValue, BasePath); 9811 9812 // Build the move. 9813 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9814 To, From, 9815 /*CopyingBaseSubobject=*/true, 9816 /*Copying=*/false); 9817 if (Move.isInvalid()) { 9818 Diag(CurrentLocation, diag::note_member_synthesized_at) 9819 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9820 MoveAssignOperator->setInvalidDecl(); 9821 return; 9822 } 9823 9824 // Success! Record the move. 9825 Statements.push_back(Move.takeAs<Expr>()); 9826 } 9827 9828 // Assign non-static members. 9829 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9830 FieldEnd = ClassDecl->field_end(); 9831 Field != FieldEnd; ++Field) { 9832 if (Field->isUnnamedBitfield()) 9833 continue; 9834 9835 if (Field->isInvalidDecl()) { 9836 Invalid = true; 9837 continue; 9838 } 9839 9840 // Check for members of reference type; we can't move those. 9841 if (Field->getType()->isReferenceType()) { 9842 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9843 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9844 Diag(Field->getLocation(), diag::note_declared_at); 9845 Diag(CurrentLocation, diag::note_member_synthesized_at) 9846 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9847 Invalid = true; 9848 continue; 9849 } 9850 9851 // Check for members of const-qualified, non-class type. 9852 QualType BaseType = Context.getBaseElementType(Field->getType()); 9853 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9854 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9855 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9856 Diag(Field->getLocation(), diag::note_declared_at); 9857 Diag(CurrentLocation, diag::note_member_synthesized_at) 9858 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9859 Invalid = true; 9860 continue; 9861 } 9862 9863 // Suppress assigning zero-width bitfields. 9864 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9865 continue; 9866 9867 QualType FieldType = Field->getType().getNonReferenceType(); 9868 if (FieldType->isIncompleteArrayType()) { 9869 assert(ClassDecl->hasFlexibleArrayMember() && 9870 "Incomplete array type is not valid"); 9871 continue; 9872 } 9873 9874 // Build references to the field in the object we're copying from and to. 9875 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9876 LookupMemberName); 9877 MemberLookup.addDecl(*Field); 9878 MemberLookup.resolveKind(); 9879 MemberBuilder From(MoveOther, OtherRefType, 9880 /*IsArrow=*/false, MemberLookup); 9881 MemberBuilder To(This, getCurrentThisType(), 9882 /*IsArrow=*/true, MemberLookup); 9883 9884 assert(!From.build(*this, Loc)->isLValue() && // could be xvalue or prvalue 9885 "Member reference with rvalue base must be rvalue except for reference " 9886 "members, which aren't allowed for move assignment."); 9887 9888 // Build the move of this field. 9889 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9890 To, From, 9891 /*CopyingBaseSubobject=*/false, 9892 /*Copying=*/false); 9893 if (Move.isInvalid()) { 9894 Diag(CurrentLocation, diag::note_member_synthesized_at) 9895 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9896 MoveAssignOperator->setInvalidDecl(); 9897 return; 9898 } 9899 9900 // Success! Record the copy. 9901 Statements.push_back(Move.takeAs<Stmt>()); 9902 } 9903 9904 if (!Invalid) { 9905 // Add a "return *this;" 9906 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This.build(*this, Loc)); 9907 9908 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9909 if (Return.isInvalid()) 9910 Invalid = true; 9911 else { 9912 Statements.push_back(Return.takeAs<Stmt>()); 9913 9914 if (Trap.hasErrorOccurred()) { 9915 Diag(CurrentLocation, diag::note_member_synthesized_at) 9916 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9917 Invalid = true; 9918 } 9919 } 9920 } 9921 9922 if (Invalid) { 9923 MoveAssignOperator->setInvalidDecl(); 9924 return; 9925 } 9926 9927 StmtResult Body; 9928 { 9929 CompoundScopeRAII CompoundScope(*this); 9930 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9931 /*isStmtExpr=*/false); 9932 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9933 } 9934 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9935 9936 if (ASTMutationListener *L = getASTMutationListener()) { 9937 L->CompletedImplicitDefinition(MoveAssignOperator); 9938 } 9939 } 9940 9941 Sema::ImplicitExceptionSpecification 9942 Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9943 CXXRecordDecl *ClassDecl = MD->getParent(); 9944 9945 ImplicitExceptionSpecification ExceptSpec(*this); 9946 if (ClassDecl->isInvalidDecl()) 9947 return ExceptSpec; 9948 9949 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9950 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9951 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9952 9953 // C++ [except.spec]p14: 9954 // An implicitly declared special member function (Clause 12) shall have an 9955 // exception-specification. [...] 9956 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9957 BaseEnd = ClassDecl->bases_end(); 9958 Base != BaseEnd; 9959 ++Base) { 9960 // Virtual bases are handled below. 9961 if (Base->isVirtual()) 9962 continue; 9963 9964 CXXRecordDecl *BaseClassDecl 9965 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9966 if (CXXConstructorDecl *CopyConstructor = 9967 LookupCopyingConstructor(BaseClassDecl, Quals)) 9968 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9969 } 9970 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9971 BaseEnd = ClassDecl->vbases_end(); 9972 Base != BaseEnd; 9973 ++Base) { 9974 CXXRecordDecl *BaseClassDecl 9975 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9976 if (CXXConstructorDecl *CopyConstructor = 9977 LookupCopyingConstructor(BaseClassDecl, Quals)) 9978 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9979 } 9980 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9981 FieldEnd = ClassDecl->field_end(); 9982 Field != FieldEnd; 9983 ++Field) { 9984 QualType FieldType = Context.getBaseElementType(Field->getType()); 9985 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9986 if (CXXConstructorDecl *CopyConstructor = 9987 LookupCopyingConstructor(FieldClassDecl, 9988 Quals | FieldType.getCVRQualifiers())) 9989 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9990 } 9991 } 9992 9993 return ExceptSpec; 9994 } 9995 9996 CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9997 CXXRecordDecl *ClassDecl) { 9998 // C++ [class.copy]p4: 9999 // If the class definition does not explicitly declare a copy 10000 // constructor, one is declared implicitly. 10001 assert(ClassDecl->needsImplicitCopyConstructor()); 10002 10003 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 10004 if (DSM.isAlreadyBeingDeclared()) 10005 return 0; 10006 10007 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10008 QualType ArgType = ClassType; 10009 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 10010 if (Const) 10011 ArgType = ArgType.withConst(); 10012 ArgType = Context.getLValueReferenceType(ArgType); 10013 10014 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10015 CXXCopyConstructor, 10016 Const); 10017 10018 DeclarationName Name 10019 = Context.DeclarationNames.getCXXConstructorName( 10020 Context.getCanonicalType(ClassType)); 10021 SourceLocation ClassLoc = ClassDecl->getLocation(); 10022 DeclarationNameInfo NameInfo(Name, ClassLoc); 10023 10024 // An implicitly-declared copy constructor is an inline public 10025 // member of its class. 10026 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 10027 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10028 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10029 Constexpr); 10030 CopyConstructor->setAccess(AS_public); 10031 CopyConstructor->setDefaulted(); 10032 10033 // Build an exception specification pointing back at this member. 10034 FunctionProtoType::ExtProtoInfo EPI = 10035 getImplicitMethodEPI(*this, CopyConstructor); 10036 CopyConstructor->setType( 10037 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10038 10039 // Add the parameter to the constructor. 10040 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 10041 ClassLoc, ClassLoc, 10042 /*IdentifierInfo=*/0, 10043 ArgType, /*TInfo=*/0, 10044 SC_None, 0); 10045 CopyConstructor->setParams(FromParam); 10046 10047 CopyConstructor->setTrivial( 10048 ClassDecl->needsOverloadResolutionForCopyConstructor() 10049 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 10050 : ClassDecl->hasTrivialCopyConstructor()); 10051 10052 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 10053 SetDeclDeleted(CopyConstructor, ClassLoc); 10054 10055 // Note that we have declared this constructor. 10056 ++ASTContext::NumImplicitCopyConstructorsDeclared; 10057 10058 if (Scope *S = getScopeForContext(ClassDecl)) 10059 PushOnScopeChains(CopyConstructor, S, false); 10060 ClassDecl->addDecl(CopyConstructor); 10061 10062 return CopyConstructor; 10063 } 10064 10065 void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 10066 CXXConstructorDecl *CopyConstructor) { 10067 assert((CopyConstructor->isDefaulted() && 10068 CopyConstructor->isCopyConstructor() && 10069 !CopyConstructor->doesThisDeclarationHaveABody() && 10070 !CopyConstructor->isDeleted()) && 10071 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 10072 10073 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 10074 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 10075 10076 // C++11 [class.copy]p7: 10077 // The [definition of an implicitly declared copy constructor] is 10078 // deprecated if the class has a user-declared copy assignment operator 10079 // or a user-declared destructor. 10080 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 10081 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 10082 10083 SynthesizedFunctionScope Scope(*this, CopyConstructor); 10084 DiagnosticErrorTrap Trap(Diags); 10085 10086 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 10087 Trap.hasErrorOccurred()) { 10088 Diag(CurrentLocation, diag::note_member_synthesized_at) 10089 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 10090 CopyConstructor->setInvalidDecl(); 10091 } else { 10092 Sema::CompoundScopeRAII CompoundScope(*this); 10093 CopyConstructor->setBody(ActOnCompoundStmt( 10094 CopyConstructor->getLocation(), CopyConstructor->getLocation(), None, 10095 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10096 } 10097 10098 CopyConstructor->markUsed(Context); 10099 if (ASTMutationListener *L = getASTMutationListener()) { 10100 L->CompletedImplicitDefinition(CopyConstructor); 10101 } 10102 } 10103 10104 Sema::ImplicitExceptionSpecification 10105 Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 10106 CXXRecordDecl *ClassDecl = MD->getParent(); 10107 10108 // C++ [except.spec]p14: 10109 // An implicitly declared special member function (Clause 12) shall have an 10110 // exception-specification. [...] 10111 ImplicitExceptionSpecification ExceptSpec(*this); 10112 if (ClassDecl->isInvalidDecl()) 10113 return ExceptSpec; 10114 10115 // Direct base-class constructors. 10116 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 10117 BEnd = ClassDecl->bases_end(); 10118 B != BEnd; ++B) { 10119 if (B->isVirtual()) // Handled below. 10120 continue; 10121 10122 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10123 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10124 CXXConstructorDecl *Constructor = 10125 LookupMovingConstructor(BaseClassDecl, 0); 10126 // If this is a deleted function, add it anyway. This might be conformant 10127 // with the standard. This might not. I'm not sure. It might not matter. 10128 if (Constructor) 10129 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10130 } 10131 } 10132 10133 // Virtual base-class constructors. 10134 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 10135 BEnd = ClassDecl->vbases_end(); 10136 B != BEnd; ++B) { 10137 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 10138 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 10139 CXXConstructorDecl *Constructor = 10140 LookupMovingConstructor(BaseClassDecl, 0); 10141 // If this is a deleted function, add it anyway. This might be conformant 10142 // with the standard. This might not. I'm not sure. It might not matter. 10143 if (Constructor) 10144 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 10145 } 10146 } 10147 10148 // Field constructors. 10149 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 10150 FEnd = ClassDecl->field_end(); 10151 F != FEnd; ++F) { 10152 QualType FieldType = Context.getBaseElementType(F->getType()); 10153 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 10154 CXXConstructorDecl *Constructor = 10155 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 10156 // If this is a deleted function, add it anyway. This might be conformant 10157 // with the standard. This might not. I'm not sure. It might not matter. 10158 // In particular, the problem is that this function never gets called. It 10159 // might just be ill-formed because this function attempts to refer to 10160 // a deleted function here. 10161 if (Constructor) 10162 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 10163 } 10164 } 10165 10166 return ExceptSpec; 10167 } 10168 10169 CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 10170 CXXRecordDecl *ClassDecl) { 10171 assert(ClassDecl->needsImplicitMoveConstructor()); 10172 10173 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 10174 if (DSM.isAlreadyBeingDeclared()) 10175 return 0; 10176 10177 QualType ClassType = Context.getTypeDeclType(ClassDecl); 10178 QualType ArgType = Context.getRValueReferenceType(ClassType); 10179 10180 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 10181 CXXMoveConstructor, 10182 false); 10183 10184 DeclarationName Name 10185 = Context.DeclarationNames.getCXXConstructorName( 10186 Context.getCanonicalType(ClassType)); 10187 SourceLocation ClassLoc = ClassDecl->getLocation(); 10188 DeclarationNameInfo NameInfo(Name, ClassLoc); 10189 10190 // C++11 [class.copy]p11: 10191 // An implicitly-declared copy/move constructor is an inline public 10192 // member of its class. 10193 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 10194 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 10195 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 10196 Constexpr); 10197 MoveConstructor->setAccess(AS_public); 10198 MoveConstructor->setDefaulted(); 10199 10200 // Build an exception specification pointing back at this member. 10201 FunctionProtoType::ExtProtoInfo EPI = 10202 getImplicitMethodEPI(*this, MoveConstructor); 10203 MoveConstructor->setType( 10204 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 10205 10206 // Add the parameter to the constructor. 10207 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 10208 ClassLoc, ClassLoc, 10209 /*IdentifierInfo=*/0, 10210 ArgType, /*TInfo=*/0, 10211 SC_None, 0); 10212 MoveConstructor->setParams(FromParam); 10213 10214 MoveConstructor->setTrivial( 10215 ClassDecl->needsOverloadResolutionForMoveConstructor() 10216 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 10217 : ClassDecl->hasTrivialMoveConstructor()); 10218 10219 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 10220 ClassDecl->setImplicitMoveConstructorIsDeleted(); 10221 SetDeclDeleted(MoveConstructor, ClassLoc); 10222 } 10223 10224 // Note that we have declared this constructor. 10225 ++ASTContext::NumImplicitMoveConstructorsDeclared; 10226 10227 if (Scope *S = getScopeForContext(ClassDecl)) 10228 PushOnScopeChains(MoveConstructor, S, false); 10229 ClassDecl->addDecl(MoveConstructor); 10230 10231 return MoveConstructor; 10232 } 10233 10234 void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 10235 CXXConstructorDecl *MoveConstructor) { 10236 assert((MoveConstructor->isDefaulted() && 10237 MoveConstructor->isMoveConstructor() && 10238 !MoveConstructor->doesThisDeclarationHaveABody() && 10239 !MoveConstructor->isDeleted()) && 10240 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 10241 10242 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 10243 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 10244 10245 SynthesizedFunctionScope Scope(*this, MoveConstructor); 10246 DiagnosticErrorTrap Trap(Diags); 10247 10248 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 10249 Trap.hasErrorOccurred()) { 10250 Diag(CurrentLocation, diag::note_member_synthesized_at) 10251 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 10252 MoveConstructor->setInvalidDecl(); 10253 } else { 10254 Sema::CompoundScopeRAII CompoundScope(*this); 10255 MoveConstructor->setBody(ActOnCompoundStmt( 10256 MoveConstructor->getLocation(), MoveConstructor->getLocation(), None, 10257 /*isStmtExpr=*/ false).takeAs<Stmt>()); 10258 } 10259 10260 MoveConstructor->markUsed(Context); 10261 10262 if (ASTMutationListener *L = getASTMutationListener()) { 10263 L->CompletedImplicitDefinition(MoveConstructor); 10264 } 10265 } 10266 10267 bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 10268 return FD->isDeleted() && FD->isDefaulted() && isa<CXXMethodDecl>(FD); 10269 } 10270 10271 void Sema::DefineImplicitLambdaToFunctionPointerConversion( 10272 SourceLocation CurrentLocation, 10273 CXXConversionDecl *Conv) { 10274 CXXRecordDecl *Lambda = Conv->getParent(); 10275 CXXMethodDecl *CallOp = Lambda->getLambdaCallOperator(); 10276 // If we are defining a specialization of a conversion to function-ptr 10277 // cache the deduced template arguments for this specialization 10278 // so that we can use them to retrieve the corresponding call-operator 10279 // and static-invoker. 10280 const TemplateArgumentList *DeducedTemplateArgs = 0; 10281 10282 10283 // Retrieve the corresponding call-operator specialization. 10284 if (Lambda->isGenericLambda()) { 10285 assert(Conv->isFunctionTemplateSpecialization()); 10286 FunctionTemplateDecl *CallOpTemplate = 10287 CallOp->getDescribedFunctionTemplate(); 10288 DeducedTemplateArgs = Conv->getTemplateSpecializationArgs(); 10289 void *InsertPos = 0; 10290 FunctionDecl *CallOpSpec = CallOpTemplate->findSpecialization( 10291 DeducedTemplateArgs->data(), 10292 DeducedTemplateArgs->size(), 10293 InsertPos); 10294 assert(CallOpSpec && 10295 "Conversion operator must have a corresponding call operator"); 10296 CallOp = cast<CXXMethodDecl>(CallOpSpec); 10297 } 10298 // Mark the call operator referenced (and add to pending instantiations 10299 // if necessary). 10300 // For both the conversion and static-invoker template specializations 10301 // we construct their body's in this function, so no need to add them 10302 // to the PendingInstantiations. 10303 MarkFunctionReferenced(CurrentLocation, CallOp); 10304 10305 SynthesizedFunctionScope Scope(*this, Conv); 10306 DiagnosticErrorTrap Trap(Diags); 10307 10308 // Retreive the static invoker... 10309 CXXMethodDecl *Invoker = Lambda->getLambdaStaticInvoker(); 10310 // ... and get the corresponding specialization for a generic lambda. 10311 if (Lambda->isGenericLambda()) { 10312 assert(DeducedTemplateArgs && 10313 "Must have deduced template arguments from Conversion Operator"); 10314 FunctionTemplateDecl *InvokeTemplate = 10315 Invoker->getDescribedFunctionTemplate(); 10316 void *InsertPos = 0; 10317 FunctionDecl *InvokeSpec = InvokeTemplate->findSpecialization( 10318 DeducedTemplateArgs->data(), 10319 DeducedTemplateArgs->size(), 10320 InsertPos); 10321 assert(InvokeSpec && 10322 "Must have a corresponding static invoker specialization"); 10323 Invoker = cast<CXXMethodDecl>(InvokeSpec); 10324 } 10325 // Construct the body of the conversion function { return __invoke; }. 10326 Expr *FunctionRef = BuildDeclRefExpr(Invoker, Invoker->getType(), 10327 VK_LValue, Conv->getLocation()).take(); 10328 assert(FunctionRef && "Can't refer to __invoke function?"); 10329 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 10330 Conv->setBody(new (Context) CompoundStmt(Context, Return, 10331 Conv->getLocation(), 10332 Conv->getLocation())); 10333 10334 Conv->markUsed(Context); 10335 Conv->setReferenced(); 10336 10337 // Fill in the __invoke function with a dummy implementation. IR generation 10338 // will fill in the actual details. 10339 Invoker->markUsed(Context); 10340 Invoker->setReferenced(); 10341 Invoker->setBody(new (Context) CompoundStmt(Conv->getLocation())); 10342 10343 if (ASTMutationListener *L = getASTMutationListener()) { 10344 L->CompletedImplicitDefinition(Conv); 10345 L->CompletedImplicitDefinition(Invoker); 10346 } 10347 } 10348 10349 10350 10351 void Sema::DefineImplicitLambdaToBlockPointerConversion( 10352 SourceLocation CurrentLocation, 10353 CXXConversionDecl *Conv) 10354 { 10355 assert(!Conv->getParent()->isGenericLambda()); 10356 10357 Conv->markUsed(Context); 10358 10359 SynthesizedFunctionScope Scope(*this, Conv); 10360 DiagnosticErrorTrap Trap(Diags); 10361 10362 // Copy-initialize the lambda object as needed to capture it. 10363 Expr *This = ActOnCXXThis(CurrentLocation).take(); 10364 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 10365 10366 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 10367 Conv->getLocation(), 10368 Conv, DerefThis); 10369 10370 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 10371 // behavior. Note that only the general conversion function does this 10372 // (since it's unusable otherwise); in the case where we inline the 10373 // block literal, it has block literal lifetime semantics. 10374 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 10375 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 10376 CK_CopyAndAutoreleaseBlockObject, 10377 BuildBlock.get(), 0, VK_RValue); 10378 10379 if (BuildBlock.isInvalid()) { 10380 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10381 Conv->setInvalidDecl(); 10382 return; 10383 } 10384 10385 // Create the return statement that returns the block from the conversion 10386 // function. 10387 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10388 if (Return.isInvalid()) { 10389 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10390 Conv->setInvalidDecl(); 10391 return; 10392 } 10393 10394 // Set the body of the conversion function. 10395 Stmt *ReturnS = Return.take(); 10396 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10397 Conv->getLocation(), 10398 Conv->getLocation())); 10399 10400 // We're done; notify the mutation listener, if any. 10401 if (ASTMutationListener *L = getASTMutationListener()) { 10402 L->CompletedImplicitDefinition(Conv); 10403 } 10404 } 10405 10406 /// \brief Determine whether the given list arguments contains exactly one 10407 /// "real" (non-default) argument. 10408 static bool hasOneRealArgument(MultiExprArg Args) { 10409 switch (Args.size()) { 10410 case 0: 10411 return false; 10412 10413 default: 10414 if (!Args[1]->isDefaultArgument()) 10415 return false; 10416 10417 // fall through 10418 case 1: 10419 return !Args[0]->isDefaultArgument(); 10420 } 10421 10422 return false; 10423 } 10424 10425 ExprResult 10426 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10427 CXXConstructorDecl *Constructor, 10428 MultiExprArg ExprArgs, 10429 bool HadMultipleCandidates, 10430 bool IsListInitialization, 10431 bool RequiresZeroInit, 10432 unsigned ConstructKind, 10433 SourceRange ParenRange) { 10434 bool Elidable = false; 10435 10436 // C++0x [class.copy]p34: 10437 // When certain criteria are met, an implementation is allowed to 10438 // omit the copy/move construction of a class object, even if the 10439 // copy/move constructor and/or destructor for the object have 10440 // side effects. [...] 10441 // - when a temporary class object that has not been bound to a 10442 // reference (12.2) would be copied/moved to a class object 10443 // with the same cv-unqualified type, the copy/move operation 10444 // can be omitted by constructing the temporary object 10445 // directly into the target of the omitted copy/move 10446 if (ConstructKind == CXXConstructExpr::CK_Complete && 10447 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10448 Expr *SubExpr = ExprArgs[0]; 10449 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10450 } 10451 10452 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10453 Elidable, ExprArgs, HadMultipleCandidates, 10454 IsListInitialization, RequiresZeroInit, 10455 ConstructKind, ParenRange); 10456 } 10457 10458 /// BuildCXXConstructExpr - Creates a complete call to a constructor, 10459 /// including handling of its default argument expressions. 10460 ExprResult 10461 Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10462 CXXConstructorDecl *Constructor, bool Elidable, 10463 MultiExprArg ExprArgs, 10464 bool HadMultipleCandidates, 10465 bool IsListInitialization, 10466 bool RequiresZeroInit, 10467 unsigned ConstructKind, 10468 SourceRange ParenRange) { 10469 MarkFunctionReferenced(ConstructLoc, Constructor); 10470 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10471 Constructor, Elidable, ExprArgs, 10472 HadMultipleCandidates, 10473 IsListInitialization, RequiresZeroInit, 10474 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10475 ParenRange)); 10476 } 10477 10478 void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10479 if (VD->isInvalidDecl()) return; 10480 10481 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10482 if (ClassDecl->isInvalidDecl()) return; 10483 if (ClassDecl->hasIrrelevantDestructor()) return; 10484 if (ClassDecl->isDependentContext()) return; 10485 10486 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10487 MarkFunctionReferenced(VD->getLocation(), Destructor); 10488 CheckDestructorAccess(VD->getLocation(), Destructor, 10489 PDiag(diag::err_access_dtor_var) 10490 << VD->getDeclName() 10491 << VD->getType()); 10492 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10493 10494 if (!VD->hasGlobalStorage()) return; 10495 10496 // Emit warning for non-trivial dtor in global scope (a real global, 10497 // class-static, function-static). 10498 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10499 10500 // TODO: this should be re-enabled for static locals by !CXAAtExit 10501 if (!VD->isStaticLocal()) 10502 Diag(VD->getLocation(), diag::warn_global_destructor); 10503 } 10504 10505 /// \brief Given a constructor and the set of arguments provided for the 10506 /// constructor, convert the arguments and add any required default arguments 10507 /// to form a proper call to this constructor. 10508 /// 10509 /// \returns true if an error occurred, false otherwise. 10510 bool 10511 Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10512 MultiExprArg ArgsPtr, 10513 SourceLocation Loc, 10514 SmallVectorImpl<Expr*> &ConvertedArgs, 10515 bool AllowExplicit, 10516 bool IsListInitialization) { 10517 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10518 unsigned NumArgs = ArgsPtr.size(); 10519 Expr **Args = ArgsPtr.data(); 10520 10521 const FunctionProtoType *Proto 10522 = Constructor->getType()->getAs<FunctionProtoType>(); 10523 assert(Proto && "Constructor without a prototype?"); 10524 unsigned NumArgsInProto = Proto->getNumArgs(); 10525 10526 // If too few arguments are available, we'll fill in the rest with defaults. 10527 if (NumArgs < NumArgsInProto) 10528 ConvertedArgs.reserve(NumArgsInProto); 10529 else 10530 ConvertedArgs.reserve(NumArgs); 10531 10532 VariadicCallType CallType = 10533 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10534 SmallVector<Expr *, 8> AllArgs; 10535 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10536 Proto, 0, 10537 llvm::makeArrayRef(Args, NumArgs), 10538 AllArgs, 10539 CallType, AllowExplicit, 10540 IsListInitialization); 10541 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10542 10543 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10544 10545 CheckConstructorCall(Constructor, 10546 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10547 AllArgs.size()), 10548 Proto, Loc); 10549 10550 return Invalid; 10551 } 10552 10553 static inline bool 10554 CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10555 const FunctionDecl *FnDecl) { 10556 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10557 if (isa<NamespaceDecl>(DC)) { 10558 return SemaRef.Diag(FnDecl->getLocation(), 10559 diag::err_operator_new_delete_declared_in_namespace) 10560 << FnDecl->getDeclName(); 10561 } 10562 10563 if (isa<TranslationUnitDecl>(DC) && 10564 FnDecl->getStorageClass() == SC_Static) { 10565 return SemaRef.Diag(FnDecl->getLocation(), 10566 diag::err_operator_new_delete_declared_static) 10567 << FnDecl->getDeclName(); 10568 } 10569 10570 return false; 10571 } 10572 10573 static inline bool 10574 CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10575 CanQualType ExpectedResultType, 10576 CanQualType ExpectedFirstParamType, 10577 unsigned DependentParamTypeDiag, 10578 unsigned InvalidParamTypeDiag) { 10579 QualType ResultType = 10580 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10581 10582 // Check that the result type is not dependent. 10583 if (ResultType->isDependentType()) 10584 return SemaRef.Diag(FnDecl->getLocation(), 10585 diag::err_operator_new_delete_dependent_result_type) 10586 << FnDecl->getDeclName() << ExpectedResultType; 10587 10588 // Check that the result type is what we expect. 10589 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10590 return SemaRef.Diag(FnDecl->getLocation(), 10591 diag::err_operator_new_delete_invalid_result_type) 10592 << FnDecl->getDeclName() << ExpectedResultType; 10593 10594 // A function template must have at least 2 parameters. 10595 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10596 return SemaRef.Diag(FnDecl->getLocation(), 10597 diag::err_operator_new_delete_template_too_few_parameters) 10598 << FnDecl->getDeclName(); 10599 10600 // The function decl must have at least 1 parameter. 10601 if (FnDecl->getNumParams() == 0) 10602 return SemaRef.Diag(FnDecl->getLocation(), 10603 diag::err_operator_new_delete_too_few_parameters) 10604 << FnDecl->getDeclName(); 10605 10606 // Check the first parameter type is not dependent. 10607 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10608 if (FirstParamType->isDependentType()) 10609 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10610 << FnDecl->getDeclName() << ExpectedFirstParamType; 10611 10612 // Check that the first parameter type is what we expect. 10613 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10614 ExpectedFirstParamType) 10615 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10616 << FnDecl->getDeclName() << ExpectedFirstParamType; 10617 10618 return false; 10619 } 10620 10621 static bool 10622 CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10623 // C++ [basic.stc.dynamic.allocation]p1: 10624 // A program is ill-formed if an allocation function is declared in a 10625 // namespace scope other than global scope or declared static in global 10626 // scope. 10627 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10628 return true; 10629 10630 CanQualType SizeTy = 10631 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10632 10633 // C++ [basic.stc.dynamic.allocation]p1: 10634 // The return type shall be void*. The first parameter shall have type 10635 // std::size_t. 10636 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10637 SizeTy, 10638 diag::err_operator_new_dependent_param_type, 10639 diag::err_operator_new_param_type)) 10640 return true; 10641 10642 // C++ [basic.stc.dynamic.allocation]p1: 10643 // The first parameter shall not have an associated default argument. 10644 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10645 return SemaRef.Diag(FnDecl->getLocation(), 10646 diag::err_operator_new_default_arg) 10647 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10648 10649 return false; 10650 } 10651 10652 static bool 10653 CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10654 // C++ [basic.stc.dynamic.deallocation]p1: 10655 // A program is ill-formed if deallocation functions are declared in a 10656 // namespace scope other than global scope or declared static in global 10657 // scope. 10658 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10659 return true; 10660 10661 // C++ [basic.stc.dynamic.deallocation]p2: 10662 // Each deallocation function shall return void and its first parameter 10663 // shall be void*. 10664 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10665 SemaRef.Context.VoidPtrTy, 10666 diag::err_operator_delete_dependent_param_type, 10667 diag::err_operator_delete_param_type)) 10668 return true; 10669 10670 return false; 10671 } 10672 10673 /// CheckOverloadedOperatorDeclaration - Check whether the declaration 10674 /// of this overloaded operator is well-formed. If so, returns false; 10675 /// otherwise, emits appropriate diagnostics and returns true. 10676 bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10677 assert(FnDecl && FnDecl->isOverloadedOperator() && 10678 "Expected an overloaded operator declaration"); 10679 10680 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10681 10682 // C++ [over.oper]p5: 10683 // The allocation and deallocation functions, operator new, 10684 // operator new[], operator delete and operator delete[], are 10685 // described completely in 3.7.3. The attributes and restrictions 10686 // found in the rest of this subclause do not apply to them unless 10687 // explicitly stated in 3.7.3. 10688 if (Op == OO_Delete || Op == OO_Array_Delete) 10689 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10690 10691 if (Op == OO_New || Op == OO_Array_New) 10692 return CheckOperatorNewDeclaration(*this, FnDecl); 10693 10694 // C++ [over.oper]p6: 10695 // An operator function shall either be a non-static member 10696 // function or be a non-member function and have at least one 10697 // parameter whose type is a class, a reference to a class, an 10698 // enumeration, or a reference to an enumeration. 10699 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10700 if (MethodDecl->isStatic()) 10701 return Diag(FnDecl->getLocation(), 10702 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10703 } else { 10704 bool ClassOrEnumParam = false; 10705 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10706 ParamEnd = FnDecl->param_end(); 10707 Param != ParamEnd; ++Param) { 10708 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10709 if (ParamType->isDependentType() || ParamType->isRecordType() || 10710 ParamType->isEnumeralType()) { 10711 ClassOrEnumParam = true; 10712 break; 10713 } 10714 } 10715 10716 if (!ClassOrEnumParam) 10717 return Diag(FnDecl->getLocation(), 10718 diag::err_operator_overload_needs_class_or_enum) 10719 << FnDecl->getDeclName(); 10720 } 10721 10722 // C++ [over.oper]p8: 10723 // An operator function cannot have default arguments (8.3.6), 10724 // except where explicitly stated below. 10725 // 10726 // Only the function-call operator allows default arguments 10727 // (C++ [over.call]p1). 10728 if (Op != OO_Call) { 10729 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10730 Param != FnDecl->param_end(); ++Param) { 10731 if ((*Param)->hasDefaultArg()) 10732 return Diag((*Param)->getLocation(), 10733 diag::err_operator_overload_default_arg) 10734 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10735 } 10736 } 10737 10738 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10739 { false, false, false } 10740 #define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10741 , { Unary, Binary, MemberOnly } 10742 #include "clang/Basic/OperatorKinds.def" 10743 }; 10744 10745 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10746 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10747 bool MustBeMemberOperator = OperatorUses[Op][2]; 10748 10749 // C++ [over.oper]p8: 10750 // [...] Operator functions cannot have more or fewer parameters 10751 // than the number required for the corresponding operator, as 10752 // described in the rest of this subclause. 10753 unsigned NumParams = FnDecl->getNumParams() 10754 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10755 if (Op != OO_Call && 10756 ((NumParams == 1 && !CanBeUnaryOperator) || 10757 (NumParams == 2 && !CanBeBinaryOperator) || 10758 (NumParams < 1) || (NumParams > 2))) { 10759 // We have the wrong number of parameters. 10760 unsigned ErrorKind; 10761 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10762 ErrorKind = 2; // 2 -> unary or binary. 10763 } else if (CanBeUnaryOperator) { 10764 ErrorKind = 0; // 0 -> unary 10765 } else { 10766 assert(CanBeBinaryOperator && 10767 "All non-call overloaded operators are unary or binary!"); 10768 ErrorKind = 1; // 1 -> binary 10769 } 10770 10771 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10772 << FnDecl->getDeclName() << NumParams << ErrorKind; 10773 } 10774 10775 // Overloaded operators other than operator() cannot be variadic. 10776 if (Op != OO_Call && 10777 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10778 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10779 << FnDecl->getDeclName(); 10780 } 10781 10782 // Some operators must be non-static member functions. 10783 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10784 return Diag(FnDecl->getLocation(), 10785 diag::err_operator_overload_must_be_member) 10786 << FnDecl->getDeclName(); 10787 } 10788 10789 // C++ [over.inc]p1: 10790 // The user-defined function called operator++ implements the 10791 // prefix and postfix ++ operator. If this function is a member 10792 // function with no parameters, or a non-member function with one 10793 // parameter of class or enumeration type, it defines the prefix 10794 // increment operator ++ for objects of that type. If the function 10795 // is a member function with one parameter (which shall be of type 10796 // int) or a non-member function with two parameters (the second 10797 // of which shall be of type int), it defines the postfix 10798 // increment operator ++ for objects of that type. 10799 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10800 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10801 bool ParamIsInt = false; 10802 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10803 ParamIsInt = BT->getKind() == BuiltinType::Int; 10804 10805 if (!ParamIsInt) 10806 return Diag(LastParam->getLocation(), 10807 diag::err_operator_overload_post_incdec_must_be_int) 10808 << LastParam->getType() << (Op == OO_MinusMinus); 10809 } 10810 10811 return false; 10812 } 10813 10814 /// CheckLiteralOperatorDeclaration - Check whether the declaration 10815 /// of this literal operator function is well-formed. If so, returns 10816 /// false; otherwise, emits appropriate diagnostics and returns true. 10817 bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10818 if (isa<CXXMethodDecl>(FnDecl)) { 10819 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10820 << FnDecl->getDeclName(); 10821 return true; 10822 } 10823 10824 if (FnDecl->isExternC()) { 10825 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10826 return true; 10827 } 10828 10829 bool Valid = false; 10830 10831 // This might be the definition of a literal operator template. 10832 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10833 // This might be a specialization of a literal operator template. 10834 if (!TpDecl) 10835 TpDecl = FnDecl->getPrimaryTemplate(); 10836 10837 // template <char...> type operator "" name() and 10838 // template <class T, T...> type operator "" name() are the only valid 10839 // template signatures, and the only valid signatures with no parameters. 10840 if (TpDecl) { 10841 if (FnDecl->param_size() == 0) { 10842 // Must have one or two template parameters 10843 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10844 if (Params->size() == 1) { 10845 NonTypeTemplateParmDecl *PmDecl = 10846 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10847 10848 // The template parameter must be a char parameter pack. 10849 if (PmDecl && PmDecl->isTemplateParameterPack() && 10850 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10851 Valid = true; 10852 } else if (Params->size() == 2) { 10853 TemplateTypeParmDecl *PmType = 10854 dyn_cast<TemplateTypeParmDecl>(Params->getParam(0)); 10855 NonTypeTemplateParmDecl *PmArgs = 10856 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(1)); 10857 10858 // The second template parameter must be a parameter pack with the 10859 // first template parameter as its type. 10860 if (PmType && PmArgs && 10861 !PmType->isTemplateParameterPack() && 10862 PmArgs->isTemplateParameterPack()) { 10863 const TemplateTypeParmType *TArgs = 10864 PmArgs->getType()->getAs<TemplateTypeParmType>(); 10865 if (TArgs && TArgs->getDepth() == PmType->getDepth() && 10866 TArgs->getIndex() == PmType->getIndex()) { 10867 Valid = true; 10868 if (ActiveTemplateInstantiations.empty()) 10869 Diag(FnDecl->getLocation(), 10870 diag::ext_string_literal_operator_template); 10871 } 10872 } 10873 } 10874 } 10875 } else if (FnDecl->param_size()) { 10876 // Check the first parameter 10877 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10878 10879 QualType T = (*Param)->getType().getUnqualifiedType(); 10880 10881 // unsigned long long int, long double, and any character type are allowed 10882 // as the only parameters. 10883 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10884 Context.hasSameType(T, Context.LongDoubleTy) || 10885 Context.hasSameType(T, Context.CharTy) || 10886 Context.hasSameType(T, Context.WideCharTy) || 10887 Context.hasSameType(T, Context.Char16Ty) || 10888 Context.hasSameType(T, Context.Char32Ty)) { 10889 if (++Param == FnDecl->param_end()) 10890 Valid = true; 10891 goto FinishedParams; 10892 } 10893 10894 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10895 const PointerType *PT = T->getAs<PointerType>(); 10896 if (!PT) 10897 goto FinishedParams; 10898 T = PT->getPointeeType(); 10899 if (!T.isConstQualified() || T.isVolatileQualified()) 10900 goto FinishedParams; 10901 T = T.getUnqualifiedType(); 10902 10903 // Move on to the second parameter; 10904 ++Param; 10905 10906 // If there is no second parameter, the first must be a const char * 10907 if (Param == FnDecl->param_end()) { 10908 if (Context.hasSameType(T, Context.CharTy)) 10909 Valid = true; 10910 goto FinishedParams; 10911 } 10912 10913 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10914 // are allowed as the first parameter to a two-parameter function 10915 if (!(Context.hasSameType(T, Context.CharTy) || 10916 Context.hasSameType(T, Context.WideCharTy) || 10917 Context.hasSameType(T, Context.Char16Ty) || 10918 Context.hasSameType(T, Context.Char32Ty))) 10919 goto FinishedParams; 10920 10921 // The second and final parameter must be an std::size_t 10922 T = (*Param)->getType().getUnqualifiedType(); 10923 if (Context.hasSameType(T, Context.getSizeType()) && 10924 ++Param == FnDecl->param_end()) 10925 Valid = true; 10926 } 10927 10928 // FIXME: This diagnostic is absolutely terrible. 10929 FinishedParams: 10930 if (!Valid) { 10931 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10932 << FnDecl->getDeclName(); 10933 return true; 10934 } 10935 10936 // A parameter-declaration-clause containing a default argument is not 10937 // equivalent to any of the permitted forms. 10938 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10939 ParamEnd = FnDecl->param_end(); 10940 Param != ParamEnd; ++Param) { 10941 if ((*Param)->hasDefaultArg()) { 10942 Diag((*Param)->getDefaultArgRange().getBegin(), 10943 diag::err_literal_operator_default_argument) 10944 << (*Param)->getDefaultArgRange(); 10945 break; 10946 } 10947 } 10948 10949 StringRef LiteralName 10950 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10951 if (LiteralName[0] != '_') { 10952 // C++11 [usrlit.suffix]p1: 10953 // Literal suffix identifiers that do not start with an underscore 10954 // are reserved for future standardization. 10955 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved) 10956 << NumericLiteralParser::isValidUDSuffix(getLangOpts(), LiteralName); 10957 } 10958 10959 return false; 10960 } 10961 10962 /// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10963 /// linkage specification, including the language and (if present) 10964 /// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10965 /// the location of the language string literal, which is provided 10966 /// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10967 /// the '{' brace. Otherwise, this linkage specification does not 10968 /// have any braces. 10969 Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10970 SourceLocation LangLoc, 10971 StringRef Lang, 10972 SourceLocation LBraceLoc) { 10973 LinkageSpecDecl::LanguageIDs Language; 10974 if (Lang == "\"C\"") 10975 Language = LinkageSpecDecl::lang_c; 10976 else if (Lang == "\"C++\"") 10977 Language = LinkageSpecDecl::lang_cxx; 10978 else { 10979 Diag(LangLoc, diag::err_bad_language); 10980 return 0; 10981 } 10982 10983 // FIXME: Add all the various semantics of linkage specifications 10984 10985 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10986 ExternLoc, LangLoc, Language, 10987 LBraceLoc.isValid()); 10988 CurContext->addDecl(D); 10989 PushDeclContext(S, D); 10990 return D; 10991 } 10992 10993 /// ActOnFinishLinkageSpecification - Complete the definition of 10994 /// the C++ linkage specification LinkageSpec. If RBraceLoc is 10995 /// valid, it's the position of the closing '}' brace in a linkage 10996 /// specification that uses braces. 10997 Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10998 Decl *LinkageSpec, 10999 SourceLocation RBraceLoc) { 11000 if (LinkageSpec) { 11001 if (RBraceLoc.isValid()) { 11002 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 11003 LSDecl->setRBraceLoc(RBraceLoc); 11004 } 11005 PopDeclContext(); 11006 } 11007 return LinkageSpec; 11008 } 11009 11010 Decl *Sema::ActOnEmptyDeclaration(Scope *S, 11011 AttributeList *AttrList, 11012 SourceLocation SemiLoc) { 11013 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 11014 // Attribute declarations appertain to empty declaration so we handle 11015 // them here. 11016 if (AttrList) 11017 ProcessDeclAttributeList(S, ED, AttrList); 11018 11019 CurContext->addDecl(ED); 11020 return ED; 11021 } 11022 11023 /// \brief Perform semantic analysis for the variable declaration that 11024 /// occurs within a C++ catch clause, returning the newly-created 11025 /// variable. 11026 VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 11027 TypeSourceInfo *TInfo, 11028 SourceLocation StartLoc, 11029 SourceLocation Loc, 11030 IdentifierInfo *Name) { 11031 bool Invalid = false; 11032 QualType ExDeclType = TInfo->getType(); 11033 11034 // Arrays and functions decay. 11035 if (ExDeclType->isArrayType()) 11036 ExDeclType = Context.getArrayDecayedType(ExDeclType); 11037 else if (ExDeclType->isFunctionType()) 11038 ExDeclType = Context.getPointerType(ExDeclType); 11039 11040 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 11041 // The exception-declaration shall not denote a pointer or reference to an 11042 // incomplete type, other than [cv] void*. 11043 // N2844 forbids rvalue references. 11044 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 11045 Diag(Loc, diag::err_catch_rvalue_ref); 11046 Invalid = true; 11047 } 11048 11049 QualType BaseType = ExDeclType; 11050 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 11051 unsigned DK = diag::err_catch_incomplete; 11052 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 11053 BaseType = Ptr->getPointeeType(); 11054 Mode = 1; 11055 DK = diag::err_catch_incomplete_ptr; 11056 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 11057 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 11058 BaseType = Ref->getPointeeType(); 11059 Mode = 2; 11060 DK = diag::err_catch_incomplete_ref; 11061 } 11062 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 11063 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 11064 Invalid = true; 11065 11066 if (!Invalid && !ExDeclType->isDependentType() && 11067 RequireNonAbstractType(Loc, ExDeclType, 11068 diag::err_abstract_type_in_decl, 11069 AbstractVariableType)) 11070 Invalid = true; 11071 11072 // Only the non-fragile NeXT runtime currently supports C++ catches 11073 // of ObjC types, and no runtime supports catching ObjC types by value. 11074 if (!Invalid && getLangOpts().ObjC1) { 11075 QualType T = ExDeclType; 11076 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 11077 T = RT->getPointeeType(); 11078 11079 if (T->isObjCObjectType()) { 11080 Diag(Loc, diag::err_objc_object_catch); 11081 Invalid = true; 11082 } else if (T->isObjCObjectPointerType()) { 11083 // FIXME: should this be a test for macosx-fragile specifically? 11084 if (getLangOpts().ObjCRuntime.isFragile()) 11085 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 11086 } 11087 } 11088 11089 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 11090 ExDeclType, TInfo, SC_None); 11091 ExDecl->setExceptionVariable(true); 11092 11093 // In ARC, infer 'retaining' for variables of retainable type. 11094 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 11095 Invalid = true; 11096 11097 if (!Invalid && !ExDeclType->isDependentType()) { 11098 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 11099 // Insulate this from anything else we might currently be parsing. 11100 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 11101 11102 // C++ [except.handle]p16: 11103 // The object declared in an exception-declaration or, if the 11104 // exception-declaration does not specify a name, a temporary (12.2) is 11105 // copy-initialized (8.5) from the exception object. [...] 11106 // The object is destroyed when the handler exits, after the destruction 11107 // of any automatic objects initialized within the handler. 11108 // 11109 // We just pretend to initialize the object with itself, then make sure 11110 // it can be destroyed later. 11111 QualType initType = ExDeclType; 11112 11113 InitializedEntity entity = 11114 InitializedEntity::InitializeVariable(ExDecl); 11115 InitializationKind initKind = 11116 InitializationKind::CreateCopy(Loc, SourceLocation()); 11117 11118 Expr *opaqueValue = 11119 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 11120 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 11121 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 11122 if (result.isInvalid()) 11123 Invalid = true; 11124 else { 11125 // If the constructor used was non-trivial, set this as the 11126 // "initializer". 11127 CXXConstructExpr *construct = result.takeAs<CXXConstructExpr>(); 11128 if (!construct->getConstructor()->isTrivial()) { 11129 Expr *init = MaybeCreateExprWithCleanups(construct); 11130 ExDecl->setInit(init); 11131 } 11132 11133 // And make sure it's destructable. 11134 FinalizeVarWithDestructor(ExDecl, recordType); 11135 } 11136 } 11137 } 11138 11139 if (Invalid) 11140 ExDecl->setInvalidDecl(); 11141 11142 return ExDecl; 11143 } 11144 11145 /// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 11146 /// handler. 11147 Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 11148 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11149 bool Invalid = D.isInvalidType(); 11150 11151 // Check for unexpanded parameter packs. 11152 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 11153 UPPC_ExceptionType)) { 11154 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 11155 D.getIdentifierLoc()); 11156 Invalid = true; 11157 } 11158 11159 IdentifierInfo *II = D.getIdentifier(); 11160 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 11161 LookupOrdinaryName, 11162 ForRedeclaration)) { 11163 // The scope should be freshly made just for us. There is just no way 11164 // it contains any previous declaration. 11165 assert(!S->isDeclScope(PrevDecl)); 11166 if (PrevDecl->isTemplateParameter()) { 11167 // Maybe we will complain about the shadowed template parameter. 11168 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 11169 PrevDecl = 0; 11170 } 11171 } 11172 11173 if (D.getCXXScopeSpec().isSet() && !Invalid) { 11174 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 11175 << D.getCXXScopeSpec().getRange(); 11176 Invalid = true; 11177 } 11178 11179 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 11180 D.getLocStart(), 11181 D.getIdentifierLoc(), 11182 D.getIdentifier()); 11183 if (Invalid) 11184 ExDecl->setInvalidDecl(); 11185 11186 // Add the exception declaration into this scope. 11187 if (II) 11188 PushOnScopeChains(ExDecl, S); 11189 else 11190 CurContext->addDecl(ExDecl); 11191 11192 ProcessDeclAttributes(S, ExDecl, D); 11193 return ExDecl; 11194 } 11195 11196 Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11197 Expr *AssertExpr, 11198 Expr *AssertMessageExpr, 11199 SourceLocation RParenLoc) { 11200 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 11201 11202 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 11203 return 0; 11204 11205 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 11206 AssertMessage, RParenLoc, false); 11207 } 11208 11209 Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 11210 Expr *AssertExpr, 11211 StringLiteral *AssertMessage, 11212 SourceLocation RParenLoc, 11213 bool Failed) { 11214 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 11215 !Failed) { 11216 // In a static_assert-declaration, the constant-expression shall be a 11217 // constant expression that can be contextually converted to bool. 11218 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 11219 if (Converted.isInvalid()) 11220 Failed = true; 11221 11222 llvm::APSInt Cond; 11223 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 11224 diag::err_static_assert_expression_is_not_constant, 11225 /*AllowFold=*/false).isInvalid()) 11226 Failed = true; 11227 11228 if (!Failed && !Cond) { 11229 SmallString<256> MsgBuffer; 11230 llvm::raw_svector_ostream Msg(MsgBuffer); 11231 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 11232 Diag(StaticAssertLoc, diag::err_static_assert_failed) 11233 << Msg.str() << AssertExpr->getSourceRange(); 11234 Failed = true; 11235 } 11236 } 11237 11238 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 11239 AssertExpr, AssertMessage, RParenLoc, 11240 Failed); 11241 11242 CurContext->addDecl(Decl); 11243 return Decl; 11244 } 11245 11246 /// \brief Perform semantic analysis of the given friend type declaration. 11247 /// 11248 /// \returns A friend declaration that. 11249 FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 11250 SourceLocation FriendLoc, 11251 TypeSourceInfo *TSInfo) { 11252 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 11253 11254 QualType T = TSInfo->getType(); 11255 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 11256 11257 // C++03 [class.friend]p2: 11258 // An elaborated-type-specifier shall be used in a friend declaration 11259 // for a class.* 11260 // 11261 // * The class-key of the elaborated-type-specifier is required. 11262 if (!ActiveTemplateInstantiations.empty()) { 11263 // Do not complain about the form of friend template types during 11264 // template instantiation; we will already have complained when the 11265 // template was declared. 11266 } else { 11267 if (!T->isElaboratedTypeSpecifier()) { 11268 // If we evaluated the type to a record type, suggest putting 11269 // a tag in front. 11270 if (const RecordType *RT = T->getAs<RecordType>()) { 11271 RecordDecl *RD = RT->getDecl(); 11272 11273 std::string InsertionText = std::string(" ") + RD->getKindName(); 11274 11275 Diag(TypeRange.getBegin(), 11276 getLangOpts().CPlusPlus11 ? 11277 diag::warn_cxx98_compat_unelaborated_friend_type : 11278 diag::ext_unelaborated_friend_type) 11279 << (unsigned) RD->getTagKind() 11280 << T 11281 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 11282 InsertionText); 11283 } else { 11284 Diag(FriendLoc, 11285 getLangOpts().CPlusPlus11 ? 11286 diag::warn_cxx98_compat_nonclass_type_friend : 11287 diag::ext_nonclass_type_friend) 11288 << T 11289 << TypeRange; 11290 } 11291 } else if (T->getAs<EnumType>()) { 11292 Diag(FriendLoc, 11293 getLangOpts().CPlusPlus11 ? 11294 diag::warn_cxx98_compat_enum_friend : 11295 diag::ext_enum_friend) 11296 << T 11297 << TypeRange; 11298 } 11299 11300 // C++11 [class.friend]p3: 11301 // A friend declaration that does not declare a function shall have one 11302 // of the following forms: 11303 // friend elaborated-type-specifier ; 11304 // friend simple-type-specifier ; 11305 // friend typename-specifier ; 11306 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 11307 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 11308 } 11309 11310 // If the type specifier in a friend declaration designates a (possibly 11311 // cv-qualified) class type, that class is declared as a friend; otherwise, 11312 // the friend declaration is ignored. 11313 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 11314 } 11315 11316 /// Handle a friend tag declaration where the scope specifier was 11317 /// templated. 11318 Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 11319 unsigned TagSpec, SourceLocation TagLoc, 11320 CXXScopeSpec &SS, 11321 IdentifierInfo *Name, 11322 SourceLocation NameLoc, 11323 AttributeList *Attr, 11324 MultiTemplateParamsArg TempParamLists) { 11325 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 11326 11327 bool isExplicitSpecialization = false; 11328 bool Invalid = false; 11329 11330 if (TemplateParameterList *TemplateParams = 11331 MatchTemplateParametersToScopeSpecifier( 11332 TagLoc, NameLoc, SS, TempParamLists, /*friend*/ true, 11333 isExplicitSpecialization, Invalid)) { 11334 if (TemplateParams->size() > 0) { 11335 // This is a declaration of a class template. 11336 if (Invalid) 11337 return 0; 11338 11339 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 11340 SS, Name, NameLoc, Attr, 11341 TemplateParams, AS_public, 11342 /*ModulePrivateLoc=*/SourceLocation(), 11343 TempParamLists.size() - 1, 11344 TempParamLists.data()).take(); 11345 } else { 11346 // The "template<>" header is extraneous. 11347 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 11348 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 11349 isExplicitSpecialization = true; 11350 } 11351 } 11352 11353 if (Invalid) return 0; 11354 11355 bool isAllExplicitSpecializations = true; 11356 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 11357 if (TempParamLists[I]->size()) { 11358 isAllExplicitSpecializations = false; 11359 break; 11360 } 11361 } 11362 11363 // FIXME: don't ignore attributes. 11364 11365 // If it's explicit specializations all the way down, just forget 11366 // about the template header and build an appropriate non-templated 11367 // friend. TODO: for source fidelity, remember the headers. 11368 if (isAllExplicitSpecializations) { 11369 if (SS.isEmpty()) { 11370 bool Owned = false; 11371 bool IsDependent = false; 11372 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 11373 Attr, AS_public, 11374 /*ModulePrivateLoc=*/SourceLocation(), 11375 MultiTemplateParamsArg(), Owned, IsDependent, 11376 /*ScopedEnumKWLoc=*/SourceLocation(), 11377 /*ScopedEnumUsesClassTag=*/false, 11378 /*UnderlyingType=*/TypeResult()); 11379 } 11380 11381 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 11382 ElaboratedTypeKeyword Keyword 11383 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11384 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 11385 *Name, NameLoc); 11386 if (T.isNull()) 11387 return 0; 11388 11389 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11390 if (isa<DependentNameType>(T)) { 11391 DependentNameTypeLoc TL = 11392 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11393 TL.setElaboratedKeywordLoc(TagLoc); 11394 TL.setQualifierLoc(QualifierLoc); 11395 TL.setNameLoc(NameLoc); 11396 } else { 11397 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 11398 TL.setElaboratedKeywordLoc(TagLoc); 11399 TL.setQualifierLoc(QualifierLoc); 11400 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 11401 } 11402 11403 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11404 TSI, FriendLoc, TempParamLists); 11405 Friend->setAccess(AS_public); 11406 CurContext->addDecl(Friend); 11407 return Friend; 11408 } 11409 11410 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11411 11412 11413 11414 // Handle the case of a templated-scope friend class. e.g. 11415 // template <class T> class A<T>::B; 11416 // FIXME: we don't support these right now. 11417 Diag(NameLoc, diag::warn_template_qualified_friend_unsupported) 11418 << SS.getScopeRep() << SS.getRange() << cast<CXXRecordDecl>(CurContext); 11419 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11420 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11421 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11422 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11423 TL.setElaboratedKeywordLoc(TagLoc); 11424 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11425 TL.setNameLoc(NameLoc); 11426 11427 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11428 TSI, FriendLoc, TempParamLists); 11429 Friend->setAccess(AS_public); 11430 Friend->setUnsupportedFriend(true); 11431 CurContext->addDecl(Friend); 11432 return Friend; 11433 } 11434 11435 11436 /// Handle a friend type declaration. This works in tandem with 11437 /// ActOnTag. 11438 /// 11439 /// Notes on friend class templates: 11440 /// 11441 /// We generally treat friend class declarations as if they were 11442 /// declaring a class. So, for example, the elaborated type specifier 11443 /// in a friend declaration is required to obey the restrictions of a 11444 /// class-head (i.e. no typedefs in the scope chain), template 11445 /// parameters are required to match up with simple template-ids, &c. 11446 /// However, unlike when declaring a template specialization, it's 11447 /// okay to refer to a template specialization without an empty 11448 /// template parameter declaration, e.g. 11449 /// friend class A<T>::B<unsigned>; 11450 /// We permit this as a special case; if there are any template 11451 /// parameters present at all, require proper matching, i.e. 11452 /// template <> template \<class T> friend class A<int>::B; 11453 Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11454 MultiTemplateParamsArg TempParams) { 11455 SourceLocation Loc = DS.getLocStart(); 11456 11457 assert(DS.isFriendSpecified()); 11458 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11459 11460 // Try to convert the decl specifier to a type. This works for 11461 // friend templates because ActOnTag never produces a ClassTemplateDecl 11462 // for a TUK_Friend. 11463 Declarator TheDeclarator(DS, Declarator::MemberContext); 11464 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11465 QualType T = TSI->getType(); 11466 if (TheDeclarator.isInvalidType()) 11467 return 0; 11468 11469 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11470 return 0; 11471 11472 // This is definitely an error in C++98. It's probably meant to 11473 // be forbidden in C++0x, too, but the specification is just 11474 // poorly written. 11475 // 11476 // The problem is with declarations like the following: 11477 // template <T> friend A<T>::foo; 11478 // where deciding whether a class C is a friend or not now hinges 11479 // on whether there exists an instantiation of A that causes 11480 // 'foo' to equal C. There are restrictions on class-heads 11481 // (which we declare (by fiat) elaborated friend declarations to 11482 // be) that makes this tractable. 11483 // 11484 // FIXME: handle "template <> friend class A<T>;", which 11485 // is possibly well-formed? Who even knows? 11486 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11487 Diag(Loc, diag::err_tagless_friend_type_template) 11488 << DS.getSourceRange(); 11489 return 0; 11490 } 11491 11492 // C++98 [class.friend]p1: A friend of a class is a function 11493 // or class that is not a member of the class . . . 11494 // This is fixed in DR77, which just barely didn't make the C++03 11495 // deadline. It's also a very silly restriction that seriously 11496 // affects inner classes and which nobody else seems to implement; 11497 // thus we never diagnose it, not even in -pedantic. 11498 // 11499 // But note that we could warn about it: it's always useless to 11500 // friend one of your own members (it's not, however, worthless to 11501 // friend a member of an arbitrary specialization of your template). 11502 11503 Decl *D; 11504 if (unsigned NumTempParamLists = TempParams.size()) 11505 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11506 NumTempParamLists, 11507 TempParams.data(), 11508 TSI, 11509 DS.getFriendSpecLoc()); 11510 else 11511 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11512 11513 if (!D) 11514 return 0; 11515 11516 D->setAccess(AS_public); 11517 CurContext->addDecl(D); 11518 11519 return D; 11520 } 11521 11522 NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11523 MultiTemplateParamsArg TemplateParams) { 11524 const DeclSpec &DS = D.getDeclSpec(); 11525 11526 assert(DS.isFriendSpecified()); 11527 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11528 11529 SourceLocation Loc = D.getIdentifierLoc(); 11530 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11531 11532 // C++ [class.friend]p1 11533 // A friend of a class is a function or class.... 11534 // Note that this sees through typedefs, which is intended. 11535 // It *doesn't* see through dependent types, which is correct 11536 // according to [temp.arg.type]p3: 11537 // If a declaration acquires a function type through a 11538 // type dependent on a template-parameter and this causes 11539 // a declaration that does not use the syntactic form of a 11540 // function declarator to have a function type, the program 11541 // is ill-formed. 11542 if (!TInfo->getType()->isFunctionType()) { 11543 Diag(Loc, diag::err_unexpected_friend); 11544 11545 // It might be worthwhile to try to recover by creating an 11546 // appropriate declaration. 11547 return 0; 11548 } 11549 11550 // C++ [namespace.memdef]p3 11551 // - If a friend declaration in a non-local class first declares a 11552 // class or function, the friend class or function is a member 11553 // of the innermost enclosing namespace. 11554 // - The name of the friend is not found by simple name lookup 11555 // until a matching declaration is provided in that namespace 11556 // scope (either before or after the class declaration granting 11557 // friendship). 11558 // - If a friend function is called, its name may be found by the 11559 // name lookup that considers functions from namespaces and 11560 // classes associated with the types of the function arguments. 11561 // - When looking for a prior declaration of a class or a function 11562 // declared as a friend, scopes outside the innermost enclosing 11563 // namespace scope are not considered. 11564 11565 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11566 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11567 DeclarationName Name = NameInfo.getName(); 11568 assert(Name); 11569 11570 // Check for unexpanded parameter packs. 11571 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11572 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11573 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11574 return 0; 11575 11576 // The context we found the declaration in, or in which we should 11577 // create the declaration. 11578 DeclContext *DC; 11579 Scope *DCScope = S; 11580 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11581 ForRedeclaration); 11582 11583 // There are five cases here. 11584 // - There's no scope specifier and we're in a local class. Only look 11585 // for functions declared in the immediately-enclosing block scope. 11586 // We recover from invalid scope qualifiers as if they just weren't there. 11587 FunctionDecl *FunctionContainingLocalClass = 0; 11588 if ((SS.isInvalid() || !SS.isSet()) && 11589 (FunctionContainingLocalClass = 11590 cast<CXXRecordDecl>(CurContext)->isLocalClass())) { 11591 // C++11 [class.friend]p11: 11592 // If a friend declaration appears in a local class and the name 11593 // specified is an unqualified name, a prior declaration is 11594 // looked up without considering scopes that are outside the 11595 // innermost enclosing non-class scope. For a friend function 11596 // declaration, if there is no prior declaration, the program is 11597 // ill-formed. 11598 11599 // Find the innermost enclosing non-class scope. This is the block 11600 // scope containing the local class definition (or for a nested class, 11601 // the outer local class). 11602 DCScope = S->getFnParent(); 11603 11604 // Look up the function name in the scope. 11605 Previous.clear(LookupLocalFriendName); 11606 LookupName(Previous, S, /*AllowBuiltinCreation*/false); 11607 11608 if (!Previous.empty()) { 11609 // All possible previous declarations must have the same context: 11610 // either they were declared at block scope or they are members of 11611 // one of the enclosing local classes. 11612 DC = Previous.getRepresentativeDecl()->getDeclContext(); 11613 } else { 11614 // This is ill-formed, but provide the context that we would have 11615 // declared the function in, if we were permitted to, for error recovery. 11616 DC = FunctionContainingLocalClass; 11617 } 11618 adjustContextForLocalExternDecl(DC); 11619 11620 // C++ [class.friend]p6: 11621 // A function can be defined in a friend declaration of a class if and 11622 // only if the class is a non-local class (9.8), the function name is 11623 // unqualified, and the function has namespace scope. 11624 if (D.isFunctionDefinition()) { 11625 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11626 } 11627 11628 // - There's no scope specifier, in which case we just go to the 11629 // appropriate scope and look for a function or function template 11630 // there as appropriate. 11631 } else if (SS.isInvalid() || !SS.isSet()) { 11632 // C++11 [namespace.memdef]p3: 11633 // If the name in a friend declaration is neither qualified nor 11634 // a template-id and the declaration is a function or an 11635 // elaborated-type-specifier, the lookup to determine whether 11636 // the entity has been previously declared shall not consider 11637 // any scopes outside the innermost enclosing namespace. 11638 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11639 11640 // Find the appropriate context according to the above. 11641 DC = CurContext; 11642 11643 // Skip class contexts. If someone can cite chapter and verse 11644 // for this behavior, that would be nice --- it's what GCC and 11645 // EDG do, and it seems like a reasonable intent, but the spec 11646 // really only says that checks for unqualified existing 11647 // declarations should stop at the nearest enclosing namespace, 11648 // not that they should only consider the nearest enclosing 11649 // namespace. 11650 while (DC->isRecord()) 11651 DC = DC->getParent(); 11652 11653 DeclContext *LookupDC = DC; 11654 while (LookupDC->isTransparentContext()) 11655 LookupDC = LookupDC->getParent(); 11656 11657 while (true) { 11658 LookupQualifiedName(Previous, LookupDC); 11659 11660 if (!Previous.empty()) { 11661 DC = LookupDC; 11662 break; 11663 } 11664 11665 if (isTemplateId) { 11666 if (isa<TranslationUnitDecl>(LookupDC)) break; 11667 } else { 11668 if (LookupDC->isFileContext()) break; 11669 } 11670 LookupDC = LookupDC->getParent(); 11671 } 11672 11673 DCScope = getScopeForDeclContext(S, DC); 11674 11675 // - There's a non-dependent scope specifier, in which case we 11676 // compute it and do a previous lookup there for a function 11677 // or function template. 11678 } else if (!SS.getScopeRep()->isDependent()) { 11679 DC = computeDeclContext(SS); 11680 if (!DC) return 0; 11681 11682 if (RequireCompleteDeclContext(SS, DC)) return 0; 11683 11684 LookupQualifiedName(Previous, DC); 11685 11686 // Ignore things found implicitly in the wrong scope. 11687 // TODO: better diagnostics for this case. Suggesting the right 11688 // qualified scope would be nice... 11689 LookupResult::Filter F = Previous.makeFilter(); 11690 while (F.hasNext()) { 11691 NamedDecl *D = F.next(); 11692 if (!DC->InEnclosingNamespaceSetOf( 11693 D->getDeclContext()->getRedeclContext())) 11694 F.erase(); 11695 } 11696 F.done(); 11697 11698 if (Previous.empty()) { 11699 D.setInvalidType(); 11700 Diag(Loc, diag::err_qualified_friend_not_found) 11701 << Name << TInfo->getType(); 11702 return 0; 11703 } 11704 11705 // C++ [class.friend]p1: A friend of a class is a function or 11706 // class that is not a member of the class . . . 11707 if (DC->Equals(CurContext)) 11708 Diag(DS.getFriendSpecLoc(), 11709 getLangOpts().CPlusPlus11 ? 11710 diag::warn_cxx98_compat_friend_is_member : 11711 diag::err_friend_is_member); 11712 11713 if (D.isFunctionDefinition()) { 11714 // C++ [class.friend]p6: 11715 // A function can be defined in a friend declaration of a class if and 11716 // only if the class is a non-local class (9.8), the function name is 11717 // unqualified, and the function has namespace scope. 11718 SemaDiagnosticBuilder DB 11719 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11720 11721 DB << SS.getScopeRep(); 11722 if (DC->isFileContext()) 11723 DB << FixItHint::CreateRemoval(SS.getRange()); 11724 SS.clear(); 11725 } 11726 11727 // - There's a scope specifier that does not match any template 11728 // parameter lists, in which case we use some arbitrary context, 11729 // create a method or method template, and wait for instantiation. 11730 // - There's a scope specifier that does match some template 11731 // parameter lists, which we don't handle right now. 11732 } else { 11733 if (D.isFunctionDefinition()) { 11734 // C++ [class.friend]p6: 11735 // A function can be defined in a friend declaration of a class if and 11736 // only if the class is a non-local class (9.8), the function name is 11737 // unqualified, and the function has namespace scope. 11738 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11739 << SS.getScopeRep(); 11740 } 11741 11742 DC = CurContext; 11743 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11744 } 11745 11746 if (!DC->isRecord()) { 11747 // This implies that it has to be an operator or function. 11748 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11749 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11750 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11751 Diag(Loc, diag::err_introducing_special_friend) << 11752 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11753 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11754 return 0; 11755 } 11756 } 11757 11758 // FIXME: This is an egregious hack to cope with cases where the scope stack 11759 // does not contain the declaration context, i.e., in an out-of-line 11760 // definition of a class. 11761 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11762 if (!DCScope) { 11763 FakeDCScope.setEntity(DC); 11764 DCScope = &FakeDCScope; 11765 } 11766 11767 bool AddToScope = true; 11768 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11769 TemplateParams, AddToScope); 11770 if (!ND) return 0; 11771 11772 assert(ND->getLexicalDeclContext() == CurContext); 11773 11774 // If we performed typo correction, we might have added a scope specifier 11775 // and changed the decl context. 11776 DC = ND->getDeclContext(); 11777 11778 // Add the function declaration to the appropriate lookup tables, 11779 // adjusting the redeclarations list as necessary. We don't 11780 // want to do this yet if the friending class is dependent. 11781 // 11782 // Also update the scope-based lookup if the target context's 11783 // lookup context is in lexical scope. 11784 if (!CurContext->isDependentContext()) { 11785 DC = DC->getRedeclContext(); 11786 DC->makeDeclVisibleInContext(ND); 11787 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11788 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11789 } 11790 11791 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11792 D.getIdentifierLoc(), ND, 11793 DS.getFriendSpecLoc()); 11794 FrD->setAccess(AS_public); 11795 CurContext->addDecl(FrD); 11796 11797 if (ND->isInvalidDecl()) { 11798 FrD->setInvalidDecl(); 11799 } else { 11800 if (DC->isRecord()) CheckFriendAccess(ND); 11801 11802 FunctionDecl *FD; 11803 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11804 FD = FTD->getTemplatedDecl(); 11805 else 11806 FD = cast<FunctionDecl>(ND); 11807 11808 // C++11 [dcl.fct.default]p4: If a friend declaration specifies a 11809 // default argument expression, that declaration shall be a definition 11810 // and shall be the only declaration of the function or function 11811 // template in the translation unit. 11812 if (functionDeclHasDefaultArgument(FD)) { 11813 if (FunctionDecl *OldFD = FD->getPreviousDecl()) { 11814 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_redeclared); 11815 Diag(OldFD->getLocation(), diag::note_previous_declaration); 11816 } else if (!D.isFunctionDefinition()) 11817 Diag(FD->getLocation(), diag::err_friend_decl_with_def_arg_must_be_def); 11818 } 11819 11820 // Mark templated-scope function declarations as unsupported. 11821 if (FD->getNumTemplateParameterLists()) 11822 FrD->setUnsupportedFriend(true); 11823 } 11824 11825 return ND; 11826 } 11827 11828 void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11829 AdjustDeclIfTemplate(Dcl); 11830 11831 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11832 if (!Fn) { 11833 Diag(DelLoc, diag::err_deleted_non_function); 11834 return; 11835 } 11836 11837 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11838 // Don't consider the implicit declaration we generate for explicit 11839 // specializations. FIXME: Do not generate these implicit declarations. 11840 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11841 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11842 Diag(DelLoc, diag::err_deleted_decl_not_first); 11843 Diag(Prev->getLocation(), diag::note_previous_declaration); 11844 } 11845 // If the declaration wasn't the first, we delete the function anyway for 11846 // recovery. 11847 Fn = Fn->getCanonicalDecl(); 11848 } 11849 11850 if (Fn->isDeleted()) 11851 return; 11852 11853 // See if we're deleting a function which is already known to override a 11854 // non-deleted virtual function. 11855 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11856 bool IssuedDiagnostic = false; 11857 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11858 E = MD->end_overridden_methods(); 11859 I != E; ++I) { 11860 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11861 if (!IssuedDiagnostic) { 11862 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11863 IssuedDiagnostic = true; 11864 } 11865 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11866 } 11867 } 11868 } 11869 11870 Fn->setDeletedAsWritten(); 11871 } 11872 11873 void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11874 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11875 11876 if (MD) { 11877 if (MD->getParent()->isDependentType()) { 11878 MD->setDefaulted(); 11879 MD->setExplicitlyDefaulted(); 11880 return; 11881 } 11882 11883 CXXSpecialMember Member = getSpecialMember(MD); 11884 if (Member == CXXInvalid) { 11885 if (!MD->isInvalidDecl()) 11886 Diag(DefaultLoc, diag::err_default_special_members); 11887 return; 11888 } 11889 11890 MD->setDefaulted(); 11891 MD->setExplicitlyDefaulted(); 11892 11893 // If this definition appears within the record, do the checking when 11894 // the record is complete. 11895 const FunctionDecl *Primary = MD; 11896 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11897 // Find the uninstantiated declaration that actually had the '= default' 11898 // on it. 11899 Pattern->isDefined(Primary); 11900 11901 // If the method was defaulted on its first declaration, we will have 11902 // already performed the checking in CheckCompletedCXXClass. Such a 11903 // declaration doesn't trigger an implicit definition. 11904 if (Primary == Primary->getCanonicalDecl()) 11905 return; 11906 11907 CheckExplicitlyDefaultedSpecialMember(MD); 11908 11909 // The exception specification is needed because we are defining the 11910 // function. 11911 ResolveExceptionSpec(DefaultLoc, 11912 MD->getType()->castAs<FunctionProtoType>()); 11913 11914 if (MD->isInvalidDecl()) 11915 return; 11916 11917 switch (Member) { 11918 case CXXDefaultConstructor: 11919 DefineImplicitDefaultConstructor(DefaultLoc, 11920 cast<CXXConstructorDecl>(MD)); 11921 break; 11922 case CXXCopyConstructor: 11923 DefineImplicitCopyConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11924 break; 11925 case CXXCopyAssignment: 11926 DefineImplicitCopyAssignment(DefaultLoc, MD); 11927 break; 11928 case CXXDestructor: 11929 DefineImplicitDestructor(DefaultLoc, cast<CXXDestructorDecl>(MD)); 11930 break; 11931 case CXXMoveConstructor: 11932 DefineImplicitMoveConstructor(DefaultLoc, cast<CXXConstructorDecl>(MD)); 11933 break; 11934 case CXXMoveAssignment: 11935 DefineImplicitMoveAssignment(DefaultLoc, MD); 11936 break; 11937 case CXXInvalid: 11938 llvm_unreachable("Invalid special member."); 11939 } 11940 } else { 11941 Diag(DefaultLoc, diag::err_default_special_members); 11942 } 11943 } 11944 11945 static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11946 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11947 Stmt *SubStmt = *CI; 11948 if (!SubStmt) 11949 continue; 11950 if (isa<ReturnStmt>(SubStmt)) 11951 Self.Diag(SubStmt->getLocStart(), 11952 diag::err_return_in_constructor_handler); 11953 if (!isa<Expr>(SubStmt)) 11954 SearchForReturnInStmt(Self, SubStmt); 11955 } 11956 } 11957 11958 void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11959 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11960 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11961 SearchForReturnInStmt(*this, Handler); 11962 } 11963 } 11964 11965 bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11966 const CXXMethodDecl *Old) { 11967 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11968 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11969 11970 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11971 11972 // If the calling conventions match, everything is fine 11973 if (NewCC == OldCC) 11974 return false; 11975 11976 Diag(New->getLocation(), 11977 diag::err_conflicting_overriding_cc_attributes) 11978 << New->getDeclName() << New->getType() << Old->getType(); 11979 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11980 return true; 11981 } 11982 11983 bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11984 const CXXMethodDecl *Old) { 11985 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11986 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11987 11988 if (Context.hasSameType(NewTy, OldTy) || 11989 NewTy->isDependentType() || OldTy->isDependentType()) 11990 return false; 11991 11992 // Check if the return types are covariant 11993 QualType NewClassTy, OldClassTy; 11994 11995 /// Both types must be pointers or references to classes. 11996 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11997 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11998 NewClassTy = NewPT->getPointeeType(); 11999 OldClassTy = OldPT->getPointeeType(); 12000 } 12001 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 12002 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 12003 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 12004 NewClassTy = NewRT->getPointeeType(); 12005 OldClassTy = OldRT->getPointeeType(); 12006 } 12007 } 12008 } 12009 12010 // The return types aren't either both pointers or references to a class type. 12011 if (NewClassTy.isNull()) { 12012 Diag(New->getLocation(), 12013 diag::err_different_return_type_for_overriding_virtual_function) 12014 << New->getDeclName() << NewTy << OldTy; 12015 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12016 12017 return true; 12018 } 12019 12020 // C++ [class.virtual]p6: 12021 // If the return type of D::f differs from the return type of B::f, the 12022 // class type in the return type of D::f shall be complete at the point of 12023 // declaration of D::f or shall be the class type D. 12024 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 12025 if (!RT->isBeingDefined() && 12026 RequireCompleteType(New->getLocation(), NewClassTy, 12027 diag::err_covariant_return_incomplete, 12028 New->getDeclName())) 12029 return true; 12030 } 12031 12032 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 12033 // Check if the new class derives from the old class. 12034 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 12035 Diag(New->getLocation(), 12036 diag::err_covariant_return_not_derived) 12037 << New->getDeclName() << NewTy << OldTy; 12038 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12039 return true; 12040 } 12041 12042 // Check if we the conversion from derived to base is valid. 12043 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 12044 diag::err_covariant_return_inaccessible_base, 12045 diag::err_covariant_return_ambiguous_derived_to_base_conv, 12046 // FIXME: Should this point to the return type? 12047 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 12048 // FIXME: this note won't trigger for delayed access control 12049 // diagnostics, and it's impossible to get an undelayed error 12050 // here from access control during the original parse because 12051 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 12052 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12053 return true; 12054 } 12055 } 12056 12057 // The qualifiers of the return types must be the same. 12058 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 12059 Diag(New->getLocation(), 12060 diag::err_covariant_return_type_different_qualifications) 12061 << New->getDeclName() << NewTy << OldTy; 12062 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12063 return true; 12064 }; 12065 12066 12067 // The new class type must have the same or less qualifiers as the old type. 12068 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 12069 Diag(New->getLocation(), 12070 diag::err_covariant_return_type_class_type_more_qualified) 12071 << New->getDeclName() << NewTy << OldTy; 12072 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 12073 return true; 12074 }; 12075 12076 return false; 12077 } 12078 12079 /// \brief Mark the given method pure. 12080 /// 12081 /// \param Method the method to be marked pure. 12082 /// 12083 /// \param InitRange the source range that covers the "0" initializer. 12084 bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 12085 SourceLocation EndLoc = InitRange.getEnd(); 12086 if (EndLoc.isValid()) 12087 Method->setRangeEnd(EndLoc); 12088 12089 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 12090 Method->setPure(); 12091 return false; 12092 } 12093 12094 if (!Method->isInvalidDecl()) 12095 Diag(Method->getLocation(), diag::err_non_virtual_pure) 12096 << Method->getDeclName() << InitRange; 12097 return true; 12098 } 12099 12100 /// \brief Determine whether the given declaration is a static data member. 12101 static bool isStaticDataMember(const Decl *D) { 12102 if (const VarDecl *Var = dyn_cast_or_null<VarDecl>(D)) 12103 return Var->isStaticDataMember(); 12104 12105 return false; 12106 } 12107 12108 /// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 12109 /// an initializer for the out-of-line declaration 'Dcl'. The scope 12110 /// is a fresh scope pushed for just this purpose. 12111 /// 12112 /// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 12113 /// static data member of class X, names should be looked up in the scope of 12114 /// class X. 12115 void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 12116 // If there is no declaration, there was an error parsing it. 12117 if (D == 0 || D->isInvalidDecl()) return; 12118 12119 // We should only get called for declarations with scope specifiers, like: 12120 // int foo::bar; 12121 assert(D->isOutOfLine()); 12122 EnterDeclaratorContext(S, D->getDeclContext()); 12123 12124 // If we are parsing the initializer for a static data member, push a 12125 // new expression evaluation context that is associated with this static 12126 // data member. 12127 if (isStaticDataMember(D)) 12128 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 12129 } 12130 12131 /// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 12132 /// initializer for the out-of-line declaration 'D'. 12133 void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 12134 // If there is no declaration, there was an error parsing it. 12135 if (D == 0 || D->isInvalidDecl()) return; 12136 12137 if (isStaticDataMember(D)) 12138 PopExpressionEvaluationContext(); 12139 12140 assert(D->isOutOfLine()); 12141 ExitDeclaratorContext(S); 12142 } 12143 12144 /// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 12145 /// C++ if/switch/while/for statement. 12146 /// e.g: "if (int x = f()) {...}" 12147 DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 12148 // C++ 6.4p2: 12149 // The declarator shall not specify a function or an array. 12150 // The type-specifier-seq shall not contain typedef and shall not declare a 12151 // new class or enumeration. 12152 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 12153 "Parser allowed 'typedef' as storage class of condition decl."); 12154 12155 Decl *Dcl = ActOnDeclarator(S, D); 12156 if (!Dcl) 12157 return true; 12158 12159 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 12160 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 12161 << D.getSourceRange(); 12162 return true; 12163 } 12164 12165 return Dcl; 12166 } 12167 12168 void Sema::LoadExternalVTableUses() { 12169 if (!ExternalSource) 12170 return; 12171 12172 SmallVector<ExternalVTableUse, 4> VTables; 12173 ExternalSource->ReadUsedVTables(VTables); 12174 SmallVector<VTableUse, 4> NewUses; 12175 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 12176 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 12177 = VTablesUsed.find(VTables[I].Record); 12178 // Even if a definition wasn't required before, it may be required now. 12179 if (Pos != VTablesUsed.end()) { 12180 if (!Pos->second && VTables[I].DefinitionRequired) 12181 Pos->second = true; 12182 continue; 12183 } 12184 12185 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 12186 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 12187 } 12188 12189 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 12190 } 12191 12192 void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 12193 bool DefinitionRequired) { 12194 // Ignore any vtable uses in unevaluated operands or for classes that do 12195 // not have a vtable. 12196 if (!Class->isDynamicClass() || Class->isDependentContext() || 12197 CurContext->isDependentContext() || isUnevaluatedContext()) 12198 return; 12199 12200 // Try to insert this class into the map. 12201 LoadExternalVTableUses(); 12202 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12203 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 12204 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 12205 if (!Pos.second) { 12206 // If we already had an entry, check to see if we are promoting this vtable 12207 // to required a definition. If so, we need to reappend to the VTableUses 12208 // list, since we may have already processed the first entry. 12209 if (DefinitionRequired && !Pos.first->second) { 12210 Pos.first->second = true; 12211 } else { 12212 // Otherwise, we can early exit. 12213 return; 12214 } 12215 } 12216 12217 // Local classes need to have their virtual members marked 12218 // immediately. For all other classes, we mark their virtual members 12219 // at the end of the translation unit. 12220 if (Class->isLocalClass()) 12221 MarkVirtualMembersReferenced(Loc, Class); 12222 else 12223 VTableUses.push_back(std::make_pair(Class, Loc)); 12224 } 12225 12226 bool Sema::DefineUsedVTables() { 12227 LoadExternalVTableUses(); 12228 if (VTableUses.empty()) 12229 return false; 12230 12231 // Note: The VTableUses vector could grow as a result of marking 12232 // the members of a class as "used", so we check the size each 12233 // time through the loop and prefer indices (which are stable) to 12234 // iterators (which are not). 12235 bool DefinedAnything = false; 12236 for (unsigned I = 0; I != VTableUses.size(); ++I) { 12237 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 12238 if (!Class) 12239 continue; 12240 12241 SourceLocation Loc = VTableUses[I].second; 12242 12243 bool DefineVTable = true; 12244 12245 // If this class has a key function, but that key function is 12246 // defined in another translation unit, we don't need to emit the 12247 // vtable even though we're using it. 12248 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 12249 if (KeyFunction && !KeyFunction->hasBody()) { 12250 // The key function is in another translation unit. 12251 DefineVTable = false; 12252 TemplateSpecializationKind TSK = 12253 KeyFunction->getTemplateSpecializationKind(); 12254 assert(TSK != TSK_ExplicitInstantiationDefinition && 12255 TSK != TSK_ImplicitInstantiation && 12256 "Instantiations don't have key functions"); 12257 (void)TSK; 12258 } else if (!KeyFunction) { 12259 // If we have a class with no key function that is the subject 12260 // of an explicit instantiation declaration, suppress the 12261 // vtable; it will live with the explicit instantiation 12262 // definition. 12263 bool IsExplicitInstantiationDeclaration 12264 = Class->getTemplateSpecializationKind() 12265 == TSK_ExplicitInstantiationDeclaration; 12266 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 12267 REnd = Class->redecls_end(); 12268 R != REnd; ++R) { 12269 TemplateSpecializationKind TSK 12270 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 12271 if (TSK == TSK_ExplicitInstantiationDeclaration) 12272 IsExplicitInstantiationDeclaration = true; 12273 else if (TSK == TSK_ExplicitInstantiationDefinition) { 12274 IsExplicitInstantiationDeclaration = false; 12275 break; 12276 } 12277 } 12278 12279 if (IsExplicitInstantiationDeclaration) 12280 DefineVTable = false; 12281 } 12282 12283 // The exception specifications for all virtual members may be needed even 12284 // if we are not providing an authoritative form of the vtable in this TU. 12285 // We may choose to emit it available_externally anyway. 12286 if (!DefineVTable) { 12287 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 12288 continue; 12289 } 12290 12291 // Mark all of the virtual members of this class as referenced, so 12292 // that we can build a vtable. Then, tell the AST consumer that a 12293 // vtable for this class is required. 12294 DefinedAnything = true; 12295 MarkVirtualMembersReferenced(Loc, Class); 12296 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 12297 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 12298 12299 // Optionally warn if we're emitting a weak vtable. 12300 if (Class->isExternallyVisible() && 12301 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 12302 const FunctionDecl *KeyFunctionDef = 0; 12303 if (!KeyFunction || 12304 (KeyFunction->hasBody(KeyFunctionDef) && 12305 KeyFunctionDef->isInlined())) 12306 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 12307 TSK_ExplicitInstantiationDefinition 12308 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 12309 << Class; 12310 } 12311 } 12312 VTableUses.clear(); 12313 12314 return DefinedAnything; 12315 } 12316 12317 void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 12318 const CXXRecordDecl *RD) { 12319 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 12320 E = RD->method_end(); I != E; ++I) 12321 if ((*I)->isVirtual() && !(*I)->isPure()) 12322 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 12323 } 12324 12325 void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 12326 const CXXRecordDecl *RD) { 12327 // Mark all functions which will appear in RD's vtable as used. 12328 CXXFinalOverriderMap FinalOverriders; 12329 RD->getFinalOverriders(FinalOverriders); 12330 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 12331 E = FinalOverriders.end(); 12332 I != E; ++I) { 12333 for (OverridingMethods::const_iterator OI = I->second.begin(), 12334 OE = I->second.end(); 12335 OI != OE; ++OI) { 12336 assert(OI->second.size() > 0 && "no final overrider"); 12337 CXXMethodDecl *Overrider = OI->second.front().Method; 12338 12339 // C++ [basic.def.odr]p2: 12340 // [...] A virtual member function is used if it is not pure. [...] 12341 if (!Overrider->isPure()) 12342 MarkFunctionReferenced(Loc, Overrider); 12343 } 12344 } 12345 12346 // Only classes that have virtual bases need a VTT. 12347 if (RD->getNumVBases() == 0) 12348 return; 12349 12350 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 12351 e = RD->bases_end(); i != e; ++i) { 12352 const CXXRecordDecl *Base = 12353 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 12354 if (Base->getNumVBases() == 0) 12355 continue; 12356 MarkVirtualMembersReferenced(Loc, Base); 12357 } 12358 } 12359 12360 /// SetIvarInitializers - This routine builds initialization ASTs for the 12361 /// Objective-C implementation whose ivars need be initialized. 12362 void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 12363 if (!getLangOpts().CPlusPlus) 12364 return; 12365 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 12366 SmallVector<ObjCIvarDecl*, 8> ivars; 12367 CollectIvarsToConstructOrDestruct(OID, ivars); 12368 if (ivars.empty()) 12369 return; 12370 SmallVector<CXXCtorInitializer*, 32> AllToInit; 12371 for (unsigned i = 0; i < ivars.size(); i++) { 12372 FieldDecl *Field = ivars[i]; 12373 if (Field->isInvalidDecl()) 12374 continue; 12375 12376 CXXCtorInitializer *Member; 12377 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 12378 InitializationKind InitKind = 12379 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 12380 12381 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 12382 ExprResult MemberInit = 12383 InitSeq.Perform(*this, InitEntity, InitKind, None); 12384 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 12385 // Note, MemberInit could actually come back empty if no initialization 12386 // is required (e.g., because it would call a trivial default constructor) 12387 if (!MemberInit.get() || MemberInit.isInvalid()) 12388 continue; 12389 12390 Member = 12391 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 12392 SourceLocation(), 12393 MemberInit.takeAs<Expr>(), 12394 SourceLocation()); 12395 AllToInit.push_back(Member); 12396 12397 // Be sure that the destructor is accessible and is marked as referenced. 12398 if (const RecordType *RecordTy 12399 = Context.getBaseElementType(Field->getType()) 12400 ->getAs<RecordType>()) { 12401 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 12402 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 12403 MarkFunctionReferenced(Field->getLocation(), Destructor); 12404 CheckDestructorAccess(Field->getLocation(), Destructor, 12405 PDiag(diag::err_access_dtor_ivar) 12406 << Context.getBaseElementType(Field->getType())); 12407 } 12408 } 12409 } 12410 ObjCImplementation->setIvarInitializers(Context, 12411 AllToInit.data(), AllToInit.size()); 12412 } 12413 } 12414 12415 static 12416 void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12417 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12418 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12419 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12420 Sema &S) { 12421 if (Ctor->isInvalidDecl()) 12422 return; 12423 12424 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12425 12426 // Target may not be determinable yet, for instance if this is a dependent 12427 // call in an uninstantiated template. 12428 if (Target) { 12429 const FunctionDecl *FNTarget = 0; 12430 (void)Target->hasBody(FNTarget); 12431 Target = const_cast<CXXConstructorDecl*>( 12432 cast_or_null<CXXConstructorDecl>(FNTarget)); 12433 } 12434 12435 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12436 // Avoid dereferencing a null pointer here. 12437 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12438 12439 if (!Current.insert(Canonical)) 12440 return; 12441 12442 // We know that beyond here, we aren't chaining into a cycle. 12443 if (!Target || !Target->isDelegatingConstructor() || 12444 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12445 Valid.insert(Current.begin(), Current.end()); 12446 Current.clear(); 12447 // We've hit a cycle. 12448 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12449 Current.count(TCanonical)) { 12450 // If we haven't diagnosed this cycle yet, do so now. 12451 if (!Invalid.count(TCanonical)) { 12452 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12453 diag::warn_delegating_ctor_cycle) 12454 << Ctor; 12455 12456 // Don't add a note for a function delegating directly to itself. 12457 if (TCanonical != Canonical) 12458 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12459 12460 CXXConstructorDecl *C = Target; 12461 while (C->getCanonicalDecl() != Canonical) { 12462 const FunctionDecl *FNTarget = 0; 12463 (void)C->getTargetConstructor()->hasBody(FNTarget); 12464 assert(FNTarget && "Ctor cycle through bodiless function"); 12465 12466 C = const_cast<CXXConstructorDecl*>( 12467 cast<CXXConstructorDecl>(FNTarget)); 12468 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12469 } 12470 } 12471 12472 Invalid.insert(Current.begin(), Current.end()); 12473 Current.clear(); 12474 } else { 12475 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12476 } 12477 } 12478 12479 12480 void Sema::CheckDelegatingCtorCycles() { 12481 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12482 12483 for (DelegatingCtorDeclsType::iterator 12484 I = DelegatingCtorDecls.begin(ExternalSource), 12485 E = DelegatingCtorDecls.end(); 12486 I != E; ++I) 12487 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12488 12489 for (llvm::SmallSet<CXXConstructorDecl *, 4>::iterator CI = Invalid.begin(), 12490 CE = Invalid.end(); 12491 CI != CE; ++CI) 12492 (*CI)->setInvalidDecl(); 12493 } 12494 12495 namespace { 12496 /// \brief AST visitor that finds references to the 'this' expression. 12497 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12498 Sema &S; 12499 12500 public: 12501 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12502 12503 bool VisitCXXThisExpr(CXXThisExpr *E) { 12504 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12505 << E->isImplicit(); 12506 return false; 12507 } 12508 }; 12509 } 12510 12511 bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12512 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12513 if (!TSInfo) 12514 return false; 12515 12516 TypeLoc TL = TSInfo->getTypeLoc(); 12517 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12518 if (!ProtoTL) 12519 return false; 12520 12521 // C++11 [expr.prim.general]p3: 12522 // [The expression this] shall not appear before the optional 12523 // cv-qualifier-seq and it shall not appear within the declaration of a 12524 // static member function (although its type and value category are defined 12525 // within a static member function as they are within a non-static member 12526 // function). [ Note: this is because declaration matching does not occur 12527 // until the complete declarator is known. - end note ] 12528 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12529 FindCXXThisExpr Finder(*this); 12530 12531 // If the return type came after the cv-qualifier-seq, check it now. 12532 if (Proto->hasTrailingReturn() && 12533 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12534 return true; 12535 12536 // Check the exception specification. 12537 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12538 return true; 12539 12540 return checkThisInStaticMemberFunctionAttributes(Method); 12541 } 12542 12543 bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12544 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12545 if (!TSInfo) 12546 return false; 12547 12548 TypeLoc TL = TSInfo->getTypeLoc(); 12549 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12550 if (!ProtoTL) 12551 return false; 12552 12553 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12554 FindCXXThisExpr Finder(*this); 12555 12556 switch (Proto->getExceptionSpecType()) { 12557 case EST_Uninstantiated: 12558 case EST_Unevaluated: 12559 case EST_BasicNoexcept: 12560 case EST_DynamicNone: 12561 case EST_MSAny: 12562 case EST_None: 12563 break; 12564 12565 case EST_ComputedNoexcept: 12566 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12567 return true; 12568 12569 case EST_Dynamic: 12570 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12571 EEnd = Proto->exception_end(); 12572 E != EEnd; ++E) { 12573 if (!Finder.TraverseType(*E)) 12574 return true; 12575 } 12576 break; 12577 } 12578 12579 return false; 12580 } 12581 12582 bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12583 FindCXXThisExpr Finder(*this); 12584 12585 // Check attributes. 12586 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12587 A != AEnd; ++A) { 12588 // FIXME: This should be emitted by tblgen. 12589 Expr *Arg = 0; 12590 ArrayRef<Expr *> Args; 12591 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12592 Arg = G->getArg(); 12593 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12594 Arg = G->getArg(); 12595 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12596 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12597 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12598 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12599 else if (ExclusiveLockFunctionAttr *ELF 12600 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12601 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12602 else if (SharedLockFunctionAttr *SLF 12603 = dyn_cast<SharedLockFunctionAttr>(*A)) 12604 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12605 else if (ExclusiveTrylockFunctionAttr *ETLF 12606 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12607 Arg = ETLF->getSuccessValue(); 12608 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12609 } else if (SharedTrylockFunctionAttr *STLF 12610 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12611 Arg = STLF->getSuccessValue(); 12612 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12613 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12614 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12615 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12616 Arg = LR->getArg(); 12617 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12618 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12619 else if (ExclusiveLocksRequiredAttr *ELR 12620 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12621 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12622 else if (SharedLocksRequiredAttr *SLR 12623 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12624 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12625 12626 if (Arg && !Finder.TraverseStmt(Arg)) 12627 return true; 12628 12629 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12630 if (!Finder.TraverseStmt(Args[I])) 12631 return true; 12632 } 12633 } 12634 12635 return false; 12636 } 12637 12638 void 12639 Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12640 ArrayRef<ParsedType> DynamicExceptions, 12641 ArrayRef<SourceRange> DynamicExceptionRanges, 12642 Expr *NoexceptExpr, 12643 SmallVectorImpl<QualType> &Exceptions, 12644 FunctionProtoType::ExtProtoInfo &EPI) { 12645 Exceptions.clear(); 12646 EPI.ExceptionSpecType = EST; 12647 if (EST == EST_Dynamic) { 12648 Exceptions.reserve(DynamicExceptions.size()); 12649 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12650 // FIXME: Preserve type source info. 12651 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12652 12653 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12654 collectUnexpandedParameterPacks(ET, Unexpanded); 12655 if (!Unexpanded.empty()) { 12656 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12657 UPPC_ExceptionType, 12658 Unexpanded); 12659 continue; 12660 } 12661 12662 // Check that the type is valid for an exception spec, and 12663 // drop it if not. 12664 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12665 Exceptions.push_back(ET); 12666 } 12667 EPI.NumExceptions = Exceptions.size(); 12668 EPI.Exceptions = Exceptions.data(); 12669 return; 12670 } 12671 12672 if (EST == EST_ComputedNoexcept) { 12673 // If an error occurred, there's no expression here. 12674 if (NoexceptExpr) { 12675 assert((NoexceptExpr->isTypeDependent() || 12676 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12677 Context.BoolTy) && 12678 "Parser should have made sure that the expression is boolean"); 12679 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12680 EPI.ExceptionSpecType = EST_BasicNoexcept; 12681 return; 12682 } 12683 12684 if (!NoexceptExpr->isValueDependent()) 12685 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12686 diag::err_noexcept_needs_constant_expression, 12687 /*AllowFold*/ false).take(); 12688 EPI.NoexceptExpr = NoexceptExpr; 12689 } 12690 return; 12691 } 12692 } 12693 12694 /// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12695 Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12696 // Implicitly declared functions (e.g. copy constructors) are 12697 // __host__ __device__ 12698 if (D->isImplicit()) 12699 return CFT_HostDevice; 12700 12701 if (D->hasAttr<CUDAGlobalAttr>()) 12702 return CFT_Global; 12703 12704 if (D->hasAttr<CUDADeviceAttr>()) { 12705 if (D->hasAttr<CUDAHostAttr>()) 12706 return CFT_HostDevice; 12707 return CFT_Device; 12708 } 12709 12710 return CFT_Host; 12711 } 12712 12713 bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12714 CUDAFunctionTarget CalleeTarget) { 12715 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12716 // Callable from the device only." 12717 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12718 return true; 12719 12720 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12721 // Callable from the host only." 12722 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12723 // Callable from the host only." 12724 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12725 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12726 return true; 12727 12728 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12729 return true; 12730 12731 return false; 12732 } 12733 12734 /// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12735 /// 12736 MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12737 SourceLocation DeclStart, 12738 Declarator &D, Expr *BitWidth, 12739 InClassInitStyle InitStyle, 12740 AccessSpecifier AS, 12741 AttributeList *MSPropertyAttr) { 12742 IdentifierInfo *II = D.getIdentifier(); 12743 if (!II) { 12744 Diag(DeclStart, diag::err_anonymous_property); 12745 return NULL; 12746 } 12747 SourceLocation Loc = D.getIdentifierLoc(); 12748 12749 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12750 QualType T = TInfo->getType(); 12751 if (getLangOpts().CPlusPlus) { 12752 CheckExtraCXXDefaultArguments(D); 12753 12754 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12755 UPPC_DataMemberType)) { 12756 D.setInvalidType(); 12757 T = Context.IntTy; 12758 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12759 } 12760 } 12761 12762 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12763 12764 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12765 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12766 diag::err_invalid_thread) 12767 << DeclSpec::getSpecifierName(TSCS); 12768 12769 // Check to see if this name was declared as a member previously 12770 NamedDecl *PrevDecl = 0; 12771 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12772 LookupName(Previous, S); 12773 switch (Previous.getResultKind()) { 12774 case LookupResult::Found: 12775 case LookupResult::FoundUnresolvedValue: 12776 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12777 break; 12778 12779 case LookupResult::FoundOverloaded: 12780 PrevDecl = Previous.getRepresentativeDecl(); 12781 break; 12782 12783 case LookupResult::NotFound: 12784 case LookupResult::NotFoundInCurrentInstantiation: 12785 case LookupResult::Ambiguous: 12786 break; 12787 } 12788 12789 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12790 // Maybe we will complain about the shadowed template parameter. 12791 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12792 // Just pretend that we didn't see the previous declaration. 12793 PrevDecl = 0; 12794 } 12795 12796 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12797 PrevDecl = 0; 12798 12799 SourceLocation TSSL = D.getLocStart(); 12800 MSPropertyDecl *NewPD; 12801 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12802 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12803 II, T, TInfo, TSSL, 12804 Data.GetterId, Data.SetterId); 12805 ProcessDeclAttributes(TUScope, NewPD, D); 12806 NewPD->setAccess(AS); 12807 12808 if (NewPD->isInvalidDecl()) 12809 Record->setInvalidDecl(); 12810 12811 if (D.getDeclSpec().isModulePrivateSpecified()) 12812 NewPD->setModulePrivate(); 12813 12814 if (NewPD->isInvalidDecl() && PrevDecl) { 12815 // Don't introduce NewFD into scope; there's already something 12816 // with the same name in the same scope. 12817 } else if (II) { 12818 PushOnScopeChains(NewPD, S); 12819 } else 12820 Record->addDecl(NewPD); 12821 12822 return NewPD; 12823 } 12824