SemaDeclCXX.cpp revision 36155c14b691720ee3e94bfe99886229650bbfb5
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/ASTMutationListener.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/EvaluatedExprVisitor.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/RecordLayout.h" 24#include "clang/AST/RecursiveASTVisitor.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/TargetInfo.h" 30#include "clang/Lex/Preprocessor.h" 31#include "clang/Sema/CXXFieldCollector.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/Initialization.h" 34#include "clang/Sema/Lookup.h" 35#include "clang/Sema/ParsedTemplate.h" 36#include "clang/Sema/Scope.h" 37#include "clang/Sema/ScopeInfo.h" 38#include "llvm/ADT/STLExtras.h" 39#include "llvm/ADT/SmallString.h" 40#include <map> 41#include <set> 42 43using namespace clang; 44 45//===----------------------------------------------------------------------===// 46// CheckDefaultArgumentVisitor 47//===----------------------------------------------------------------------===// 48 49namespace { 50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 51 /// the default argument of a parameter to determine whether it 52 /// contains any ill-formed subexpressions. For example, this will 53 /// diagnose the use of local variables or parameters within the 54 /// default argument expression. 55 class CheckDefaultArgumentVisitor 56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 57 Expr *DefaultArg; 58 Sema *S; 59 60 public: 61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 62 : DefaultArg(defarg), S(s) {} 63 64 bool VisitExpr(Expr *Node); 65 bool VisitDeclRefExpr(DeclRefExpr *DRE); 66 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 67 bool VisitLambdaExpr(LambdaExpr *Lambda); 68 bool VisitPseudoObjectExpr(PseudoObjectExpr *POE); 69 }; 70 71 /// VisitExpr - Visit all of the children of this expression. 72 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 73 bool IsInvalid = false; 74 for (Stmt::child_range I = Node->children(); I; ++I) 75 IsInvalid |= Visit(*I); 76 return IsInvalid; 77 } 78 79 /// VisitDeclRefExpr - Visit a reference to a declaration, to 80 /// determine whether this declaration can be used in the default 81 /// argument expression. 82 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 83 NamedDecl *Decl = DRE->getDecl(); 84 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 85 // C++ [dcl.fct.default]p9 86 // Default arguments are evaluated each time the function is 87 // called. The order of evaluation of function arguments is 88 // unspecified. Consequently, parameters of a function shall not 89 // be used in default argument expressions, even if they are not 90 // evaluated. Parameters of a function declared before a default 91 // argument expression are in scope and can hide namespace and 92 // class member names. 93 return S->Diag(DRE->getLocStart(), 94 diag::err_param_default_argument_references_param) 95 << Param->getDeclName() << DefaultArg->getSourceRange(); 96 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 97 // C++ [dcl.fct.default]p7 98 // Local variables shall not be used in default argument 99 // expressions. 100 if (VDecl->isLocalVarDecl()) 101 return S->Diag(DRE->getLocStart(), 102 diag::err_param_default_argument_references_local) 103 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 104 } 105 106 return false; 107 } 108 109 /// VisitCXXThisExpr - Visit a C++ "this" expression. 110 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 111 // C++ [dcl.fct.default]p8: 112 // The keyword this shall not be used in a default argument of a 113 // member function. 114 return S->Diag(ThisE->getLocStart(), 115 diag::err_param_default_argument_references_this) 116 << ThisE->getSourceRange(); 117 } 118 119 bool CheckDefaultArgumentVisitor::VisitPseudoObjectExpr(PseudoObjectExpr *POE) { 120 bool Invalid = false; 121 for (PseudoObjectExpr::semantics_iterator 122 i = POE->semantics_begin(), e = POE->semantics_end(); i != e; ++i) { 123 Expr *E = *i; 124 125 // Look through bindings. 126 if (OpaqueValueExpr *OVE = dyn_cast<OpaqueValueExpr>(E)) { 127 E = OVE->getSourceExpr(); 128 assert(E && "pseudo-object binding without source expression?"); 129 } 130 131 Invalid |= Visit(E); 132 } 133 return Invalid; 134 } 135 136 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 137 // C++11 [expr.lambda.prim]p13: 138 // A lambda-expression appearing in a default argument shall not 139 // implicitly or explicitly capture any entity. 140 if (Lambda->capture_begin() == Lambda->capture_end()) 141 return false; 142 143 return S->Diag(Lambda->getLocStart(), 144 diag::err_lambda_capture_default_arg); 145 } 146} 147 148void 149Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 150 const CXXMethodDecl *Method) { 151 // If we have an MSAny spec already, don't bother. 152 if (!Method || ComputedEST == EST_MSAny) 153 return; 154 155 const FunctionProtoType *Proto 156 = Method->getType()->getAs<FunctionProtoType>(); 157 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 158 if (!Proto) 159 return; 160 161 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 162 163 // If this function can throw any exceptions, make a note of that. 164 if (EST == EST_MSAny || EST == EST_None) { 165 ClearExceptions(); 166 ComputedEST = EST; 167 return; 168 } 169 170 // FIXME: If the call to this decl is using any of its default arguments, we 171 // need to search them for potentially-throwing calls. 172 173 // If this function has a basic noexcept, it doesn't affect the outcome. 174 if (EST == EST_BasicNoexcept) 175 return; 176 177 // If we have a throw-all spec at this point, ignore the function. 178 if (ComputedEST == EST_None) 179 return; 180 181 // If we're still at noexcept(true) and there's a nothrow() callee, 182 // change to that specification. 183 if (EST == EST_DynamicNone) { 184 if (ComputedEST == EST_BasicNoexcept) 185 ComputedEST = EST_DynamicNone; 186 return; 187 } 188 189 // Check out noexcept specs. 190 if (EST == EST_ComputedNoexcept) { 191 FunctionProtoType::NoexceptResult NR = 192 Proto->getNoexceptSpec(Self->Context); 193 assert(NR != FunctionProtoType::NR_NoNoexcept && 194 "Must have noexcept result for EST_ComputedNoexcept."); 195 assert(NR != FunctionProtoType::NR_Dependent && 196 "Should not generate implicit declarations for dependent cases, " 197 "and don't know how to handle them anyway."); 198 199 // noexcept(false) -> no spec on the new function 200 if (NR == FunctionProtoType::NR_Throw) { 201 ClearExceptions(); 202 ComputedEST = EST_None; 203 } 204 // noexcept(true) won't change anything either. 205 return; 206 } 207 208 assert(EST == EST_Dynamic && "EST case not considered earlier."); 209 assert(ComputedEST != EST_None && 210 "Shouldn't collect exceptions when throw-all is guaranteed."); 211 ComputedEST = EST_Dynamic; 212 // Record the exceptions in this function's exception specification. 213 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 214 EEnd = Proto->exception_end(); 215 E != EEnd; ++E) 216 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 217 Exceptions.push_back(*E); 218} 219 220void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 221 if (!E || ComputedEST == EST_MSAny) 222 return; 223 224 // FIXME: 225 // 226 // C++0x [except.spec]p14: 227 // [An] implicit exception-specification specifies the type-id T if and 228 // only if T is allowed by the exception-specification of a function directly 229 // invoked by f's implicit definition; f shall allow all exceptions if any 230 // function it directly invokes allows all exceptions, and f shall allow no 231 // exceptions if every function it directly invokes allows no exceptions. 232 // 233 // Note in particular that if an implicit exception-specification is generated 234 // for a function containing a throw-expression, that specification can still 235 // be noexcept(true). 236 // 237 // Note also that 'directly invoked' is not defined in the standard, and there 238 // is no indication that we should only consider potentially-evaluated calls. 239 // 240 // Ultimately we should implement the intent of the standard: the exception 241 // specification should be the set of exceptions which can be thrown by the 242 // implicit definition. For now, we assume that any non-nothrow expression can 243 // throw any exception. 244 245 if (Self->canThrow(E)) 246 ComputedEST = EST_None; 247} 248 249bool 250Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 251 SourceLocation EqualLoc) { 252 if (RequireCompleteType(Param->getLocation(), Param->getType(), 253 diag::err_typecheck_decl_incomplete_type)) { 254 Param->setInvalidDecl(); 255 return true; 256 } 257 258 // C++ [dcl.fct.default]p5 259 // A default argument expression is implicitly converted (clause 260 // 4) to the parameter type. The default argument expression has 261 // the same semantic constraints as the initializer expression in 262 // a declaration of a variable of the parameter type, using the 263 // copy-initialization semantics (8.5). 264 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 265 Param); 266 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 267 EqualLoc); 268 InitializationSequence InitSeq(*this, Entity, Kind, Arg); 269 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 270 if (Result.isInvalid()) 271 return true; 272 Arg = Result.takeAs<Expr>(); 273 274 CheckCompletedExpr(Arg, EqualLoc); 275 Arg = MaybeCreateExprWithCleanups(Arg); 276 277 // Okay: add the default argument to the parameter 278 Param->setDefaultArg(Arg); 279 280 // We have already instantiated this parameter; provide each of the 281 // instantiations with the uninstantiated default argument. 282 UnparsedDefaultArgInstantiationsMap::iterator InstPos 283 = UnparsedDefaultArgInstantiations.find(Param); 284 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 285 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 286 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 287 288 // We're done tracking this parameter's instantiations. 289 UnparsedDefaultArgInstantiations.erase(InstPos); 290 } 291 292 return false; 293} 294 295/// ActOnParamDefaultArgument - Check whether the default argument 296/// provided for a function parameter is well-formed. If so, attach it 297/// to the parameter declaration. 298void 299Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 300 Expr *DefaultArg) { 301 if (!param || !DefaultArg) 302 return; 303 304 ParmVarDecl *Param = cast<ParmVarDecl>(param); 305 UnparsedDefaultArgLocs.erase(Param); 306 307 // Default arguments are only permitted in C++ 308 if (!getLangOpts().CPlusPlus) { 309 Diag(EqualLoc, diag::err_param_default_argument) 310 << DefaultArg->getSourceRange(); 311 Param->setInvalidDecl(); 312 return; 313 } 314 315 // Check for unexpanded parameter packs. 316 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 317 Param->setInvalidDecl(); 318 return; 319 } 320 321 // Check that the default argument is well-formed 322 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 323 if (DefaultArgChecker.Visit(DefaultArg)) { 324 Param->setInvalidDecl(); 325 return; 326 } 327 328 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 329} 330 331/// ActOnParamUnparsedDefaultArgument - We've seen a default 332/// argument for a function parameter, but we can't parse it yet 333/// because we're inside a class definition. Note that this default 334/// argument will be parsed later. 335void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 336 SourceLocation EqualLoc, 337 SourceLocation ArgLoc) { 338 if (!param) 339 return; 340 341 ParmVarDecl *Param = cast<ParmVarDecl>(param); 342 if (Param) 343 Param->setUnparsedDefaultArg(); 344 345 UnparsedDefaultArgLocs[Param] = ArgLoc; 346} 347 348/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 349/// the default argument for the parameter param failed. 350void Sema::ActOnParamDefaultArgumentError(Decl *param) { 351 if (!param) 352 return; 353 354 ParmVarDecl *Param = cast<ParmVarDecl>(param); 355 356 Param->setInvalidDecl(); 357 358 UnparsedDefaultArgLocs.erase(Param); 359} 360 361/// CheckExtraCXXDefaultArguments - Check for any extra default 362/// arguments in the declarator, which is not a function declaration 363/// or definition and therefore is not permitted to have default 364/// arguments. This routine should be invoked for every declarator 365/// that is not a function declaration or definition. 366void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 367 // C++ [dcl.fct.default]p3 368 // A default argument expression shall be specified only in the 369 // parameter-declaration-clause of a function declaration or in a 370 // template-parameter (14.1). It shall not be specified for a 371 // parameter pack. If it is specified in a 372 // parameter-declaration-clause, it shall not occur within a 373 // declarator or abstract-declarator of a parameter-declaration. 374 bool MightBeFunction = D.isFunctionDeclarationContext(); 375 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 376 DeclaratorChunk &chunk = D.getTypeObject(i); 377 if (chunk.Kind == DeclaratorChunk::Function) { 378 if (MightBeFunction) { 379 // This is a function declaration. It can have default arguments, but 380 // keep looking in case its return type is a function type with default 381 // arguments. 382 MightBeFunction = false; 383 continue; 384 } 385 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 386 ParmVarDecl *Param = 387 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 388 if (Param->hasUnparsedDefaultArg()) { 389 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 390 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 391 << SourceRange((*Toks)[1].getLocation(), 392 Toks->back().getLocation()); 393 delete Toks; 394 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 395 } else if (Param->getDefaultArg()) { 396 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 397 << Param->getDefaultArg()->getSourceRange(); 398 Param->setDefaultArg(0); 399 } 400 } 401 } else if (chunk.Kind != DeclaratorChunk::Paren) { 402 MightBeFunction = false; 403 } 404 } 405} 406 407/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 408/// function, once we already know that they have the same 409/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 410/// error, false otherwise. 411bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 412 Scope *S) { 413 bool Invalid = false; 414 415 // C++ [dcl.fct.default]p4: 416 // For non-template functions, default arguments can be added in 417 // later declarations of a function in the same 418 // scope. Declarations in different scopes have completely 419 // distinct sets of default arguments. That is, declarations in 420 // inner scopes do not acquire default arguments from 421 // declarations in outer scopes, and vice versa. In a given 422 // function declaration, all parameters subsequent to a 423 // parameter with a default argument shall have default 424 // arguments supplied in this or previous declarations. A 425 // default argument shall not be redefined by a later 426 // declaration (not even to the same value). 427 // 428 // C++ [dcl.fct.default]p6: 429 // Except for member functions of class templates, the default arguments 430 // in a member function definition that appears outside of the class 431 // definition are added to the set of default arguments provided by the 432 // member function declaration in the class definition. 433 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 434 ParmVarDecl *OldParam = Old->getParamDecl(p); 435 ParmVarDecl *NewParam = New->getParamDecl(p); 436 437 bool OldParamHasDfl = OldParam->hasDefaultArg(); 438 bool NewParamHasDfl = NewParam->hasDefaultArg(); 439 440 NamedDecl *ND = Old; 441 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 442 // Ignore default parameters of old decl if they are not in 443 // the same scope. 444 OldParamHasDfl = false; 445 446 if (OldParamHasDfl && NewParamHasDfl) { 447 448 unsigned DiagDefaultParamID = 449 diag::err_param_default_argument_redefinition; 450 451 // MSVC accepts that default parameters be redefined for member functions 452 // of template class. The new default parameter's value is ignored. 453 Invalid = true; 454 if (getLangOpts().MicrosoftExt) { 455 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 456 if (MD && MD->getParent()->getDescribedClassTemplate()) { 457 // Merge the old default argument into the new parameter. 458 NewParam->setHasInheritedDefaultArg(); 459 if (OldParam->hasUninstantiatedDefaultArg()) 460 NewParam->setUninstantiatedDefaultArg( 461 OldParam->getUninstantiatedDefaultArg()); 462 else 463 NewParam->setDefaultArg(OldParam->getInit()); 464 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 465 Invalid = false; 466 } 467 } 468 469 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 470 // hint here. Alternatively, we could walk the type-source information 471 // for NewParam to find the last source location in the type... but it 472 // isn't worth the effort right now. This is the kind of test case that 473 // is hard to get right: 474 // int f(int); 475 // void g(int (*fp)(int) = f); 476 // void g(int (*fp)(int) = &f); 477 Diag(NewParam->getLocation(), DiagDefaultParamID) 478 << NewParam->getDefaultArgRange(); 479 480 // Look for the function declaration where the default argument was 481 // actually written, which may be a declaration prior to Old. 482 for (FunctionDecl *Older = Old->getPreviousDecl(); 483 Older; Older = Older->getPreviousDecl()) { 484 if (!Older->getParamDecl(p)->hasDefaultArg()) 485 break; 486 487 OldParam = Older->getParamDecl(p); 488 } 489 490 Diag(OldParam->getLocation(), diag::note_previous_definition) 491 << OldParam->getDefaultArgRange(); 492 } else if (OldParamHasDfl) { 493 // Merge the old default argument into the new parameter. 494 // It's important to use getInit() here; getDefaultArg() 495 // strips off any top-level ExprWithCleanups. 496 NewParam->setHasInheritedDefaultArg(); 497 if (OldParam->hasUninstantiatedDefaultArg()) 498 NewParam->setUninstantiatedDefaultArg( 499 OldParam->getUninstantiatedDefaultArg()); 500 else 501 NewParam->setDefaultArg(OldParam->getInit()); 502 } else if (NewParamHasDfl) { 503 if (New->getDescribedFunctionTemplate()) { 504 // Paragraph 4, quoted above, only applies to non-template functions. 505 Diag(NewParam->getLocation(), 506 diag::err_param_default_argument_template_redecl) 507 << NewParam->getDefaultArgRange(); 508 Diag(Old->getLocation(), diag::note_template_prev_declaration) 509 << false; 510 } else if (New->getTemplateSpecializationKind() 511 != TSK_ImplicitInstantiation && 512 New->getTemplateSpecializationKind() != TSK_Undeclared) { 513 // C++ [temp.expr.spec]p21: 514 // Default function arguments shall not be specified in a declaration 515 // or a definition for one of the following explicit specializations: 516 // - the explicit specialization of a function template; 517 // - the explicit specialization of a member function template; 518 // - the explicit specialization of a member function of a class 519 // template where the class template specialization to which the 520 // member function specialization belongs is implicitly 521 // instantiated. 522 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 523 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 524 << New->getDeclName() 525 << NewParam->getDefaultArgRange(); 526 } else if (New->getDeclContext()->isDependentContext()) { 527 // C++ [dcl.fct.default]p6 (DR217): 528 // Default arguments for a member function of a class template shall 529 // be specified on the initial declaration of the member function 530 // within the class template. 531 // 532 // Reading the tea leaves a bit in DR217 and its reference to DR205 533 // leads me to the conclusion that one cannot add default function 534 // arguments for an out-of-line definition of a member function of a 535 // dependent type. 536 int WhichKind = 2; 537 if (CXXRecordDecl *Record 538 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 539 if (Record->getDescribedClassTemplate()) 540 WhichKind = 0; 541 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 542 WhichKind = 1; 543 else 544 WhichKind = 2; 545 } 546 547 Diag(NewParam->getLocation(), 548 diag::err_param_default_argument_member_template_redecl) 549 << WhichKind 550 << NewParam->getDefaultArgRange(); 551 } 552 } 553 } 554 555 // DR1344: If a default argument is added outside a class definition and that 556 // default argument makes the function a special member function, the program 557 // is ill-formed. This can only happen for constructors. 558 if (isa<CXXConstructorDecl>(New) && 559 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 560 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 561 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 562 if (NewSM != OldSM) { 563 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 564 assert(NewParam->hasDefaultArg()); 565 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 566 << NewParam->getDefaultArgRange() << NewSM; 567 Diag(Old->getLocation(), diag::note_previous_declaration); 568 } 569 } 570 571 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 572 // template has a constexpr specifier then all its declarations shall 573 // contain the constexpr specifier. 574 if (New->isConstexpr() != Old->isConstexpr()) { 575 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 576 << New << New->isConstexpr(); 577 Diag(Old->getLocation(), diag::note_previous_declaration); 578 Invalid = true; 579 } 580 581 if (CheckEquivalentExceptionSpec(Old, New)) 582 Invalid = true; 583 584 return Invalid; 585} 586 587/// \brief Merge the exception specifications of two variable declarations. 588/// 589/// This is called when there's a redeclaration of a VarDecl. The function 590/// checks if the redeclaration might have an exception specification and 591/// validates compatibility and merges the specs if necessary. 592void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 593 // Shortcut if exceptions are disabled. 594 if (!getLangOpts().CXXExceptions) 595 return; 596 597 assert(Context.hasSameType(New->getType(), Old->getType()) && 598 "Should only be called if types are otherwise the same."); 599 600 QualType NewType = New->getType(); 601 QualType OldType = Old->getType(); 602 603 // We're only interested in pointers and references to functions, as well 604 // as pointers to member functions. 605 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 606 NewType = R->getPointeeType(); 607 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 608 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 609 NewType = P->getPointeeType(); 610 OldType = OldType->getAs<PointerType>()->getPointeeType(); 611 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 612 NewType = M->getPointeeType(); 613 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 614 } 615 616 if (!NewType->isFunctionProtoType()) 617 return; 618 619 // There's lots of special cases for functions. For function pointers, system 620 // libraries are hopefully not as broken so that we don't need these 621 // workarounds. 622 if (CheckEquivalentExceptionSpec( 623 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 624 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 625 New->setInvalidDecl(); 626 } 627} 628 629/// CheckCXXDefaultArguments - Verify that the default arguments for a 630/// function declaration are well-formed according to C++ 631/// [dcl.fct.default]. 632void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 633 unsigned NumParams = FD->getNumParams(); 634 unsigned p; 635 636 // Find first parameter with a default argument 637 for (p = 0; p < NumParams; ++p) { 638 ParmVarDecl *Param = FD->getParamDecl(p); 639 if (Param->hasDefaultArg()) 640 break; 641 } 642 643 // C++ [dcl.fct.default]p4: 644 // In a given function declaration, all parameters 645 // subsequent to a parameter with a default argument shall 646 // have default arguments supplied in this or previous 647 // declarations. A default argument shall not be redefined 648 // by a later declaration (not even to the same value). 649 unsigned LastMissingDefaultArg = 0; 650 for (; p < NumParams; ++p) { 651 ParmVarDecl *Param = FD->getParamDecl(p); 652 if (!Param->hasDefaultArg()) { 653 if (Param->isInvalidDecl()) 654 /* We already complained about this parameter. */; 655 else if (Param->getIdentifier()) 656 Diag(Param->getLocation(), 657 diag::err_param_default_argument_missing_name) 658 << Param->getIdentifier(); 659 else 660 Diag(Param->getLocation(), 661 diag::err_param_default_argument_missing); 662 663 LastMissingDefaultArg = p; 664 } 665 } 666 667 if (LastMissingDefaultArg > 0) { 668 // Some default arguments were missing. Clear out all of the 669 // default arguments up to (and including) the last missing 670 // default argument, so that we leave the function parameters 671 // in a semantically valid state. 672 for (p = 0; p <= LastMissingDefaultArg; ++p) { 673 ParmVarDecl *Param = FD->getParamDecl(p); 674 if (Param->hasDefaultArg()) { 675 Param->setDefaultArg(0); 676 } 677 } 678 } 679} 680 681// CheckConstexprParameterTypes - Check whether a function's parameter types 682// are all literal types. If so, return true. If not, produce a suitable 683// diagnostic and return false. 684static bool CheckConstexprParameterTypes(Sema &SemaRef, 685 const FunctionDecl *FD) { 686 unsigned ArgIndex = 0; 687 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 688 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 689 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 690 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 691 SourceLocation ParamLoc = PD->getLocation(); 692 if (!(*i)->isDependentType() && 693 SemaRef.RequireLiteralType(ParamLoc, *i, 694 diag::err_constexpr_non_literal_param, 695 ArgIndex+1, PD->getSourceRange(), 696 isa<CXXConstructorDecl>(FD))) 697 return false; 698 } 699 return true; 700} 701 702/// \brief Get diagnostic %select index for tag kind for 703/// record diagnostic message. 704/// WARNING: Indexes apply to particular diagnostics only! 705/// 706/// \returns diagnostic %select index. 707static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 708 switch (Tag) { 709 case TTK_Struct: return 0; 710 case TTK_Interface: return 1; 711 case TTK_Class: return 2; 712 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 713 } 714} 715 716// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 717// the requirements of a constexpr function definition or a constexpr 718// constructor definition. If so, return true. If not, produce appropriate 719// diagnostics and return false. 720// 721// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 722bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 723 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 724 if (MD && MD->isInstance()) { 725 // C++11 [dcl.constexpr]p4: 726 // The definition of a constexpr constructor shall satisfy the following 727 // constraints: 728 // - the class shall not have any virtual base classes; 729 const CXXRecordDecl *RD = MD->getParent(); 730 if (RD->getNumVBases()) { 731 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 732 << isa<CXXConstructorDecl>(NewFD) 733 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 734 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 735 E = RD->vbases_end(); I != E; ++I) 736 Diag(I->getLocStart(), 737 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 738 return false; 739 } 740 } 741 742 if (!isa<CXXConstructorDecl>(NewFD)) { 743 // C++11 [dcl.constexpr]p3: 744 // The definition of a constexpr function shall satisfy the following 745 // constraints: 746 // - it shall not be virtual; 747 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 748 if (Method && Method->isVirtual()) { 749 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 750 751 // If it's not obvious why this function is virtual, find an overridden 752 // function which uses the 'virtual' keyword. 753 const CXXMethodDecl *WrittenVirtual = Method; 754 while (!WrittenVirtual->isVirtualAsWritten()) 755 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 756 if (WrittenVirtual != Method) 757 Diag(WrittenVirtual->getLocation(), 758 diag::note_overridden_virtual_function); 759 return false; 760 } 761 762 // - its return type shall be a literal type; 763 QualType RT = NewFD->getResultType(); 764 if (!RT->isDependentType() && 765 RequireLiteralType(NewFD->getLocation(), RT, 766 diag::err_constexpr_non_literal_return)) 767 return false; 768 } 769 770 // - each of its parameter types shall be a literal type; 771 if (!CheckConstexprParameterTypes(*this, NewFD)) 772 return false; 773 774 return true; 775} 776 777/// Check the given declaration statement is legal within a constexpr function 778/// body. C++11 [dcl.constexpr]p3,p4, and C++1y [dcl.constexpr]p3. 779/// 780/// \return true if the body is OK (maybe only as an extension), false if we 781/// have diagnosed a problem. 782static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 783 DeclStmt *DS, SourceLocation &Cxx1yLoc) { 784 // C++11 [dcl.constexpr]p3 and p4: 785 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 786 // contain only 787 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 788 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 789 switch ((*DclIt)->getKind()) { 790 case Decl::StaticAssert: 791 case Decl::Using: 792 case Decl::UsingShadow: 793 case Decl::UsingDirective: 794 case Decl::UnresolvedUsingTypename: 795 case Decl::UnresolvedUsingValue: 796 // - static_assert-declarations 797 // - using-declarations, 798 // - using-directives, 799 continue; 800 801 case Decl::Typedef: 802 case Decl::TypeAlias: { 803 // - typedef declarations and alias-declarations that do not define 804 // classes or enumerations, 805 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 806 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 807 // Don't allow variably-modified types in constexpr functions. 808 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 809 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 810 << TL.getSourceRange() << TL.getType() 811 << isa<CXXConstructorDecl>(Dcl); 812 return false; 813 } 814 continue; 815 } 816 817 case Decl::Enum: 818 case Decl::CXXRecord: 819 // C++1y allows types to be defined, not just declared. 820 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) 821 SemaRef.Diag(DS->getLocStart(), 822 SemaRef.getLangOpts().CPlusPlus1y 823 ? diag::warn_cxx11_compat_constexpr_type_definition 824 : diag::ext_constexpr_type_definition) 825 << isa<CXXConstructorDecl>(Dcl); 826 continue; 827 828 case Decl::EnumConstant: 829 case Decl::IndirectField: 830 case Decl::ParmVar: 831 // These can only appear with other declarations which are banned in 832 // C++11 and permitted in C++1y, so ignore them. 833 continue; 834 835 case Decl::Var: { 836 // C++1y [dcl.constexpr]p3 allows anything except: 837 // a definition of a variable of non-literal type or of static or 838 // thread storage duration or for which no initialization is performed. 839 VarDecl *VD = cast<VarDecl>(*DclIt); 840 if (VD->isThisDeclarationADefinition()) { 841 if (VD->isStaticLocal()) { 842 SemaRef.Diag(VD->getLocation(), 843 diag::err_constexpr_local_var_static) 844 << isa<CXXConstructorDecl>(Dcl) 845 << (VD->getTLSKind() == VarDecl::TLS_Dynamic); 846 return false; 847 } 848 if (!VD->getType()->isDependentType() && 849 SemaRef.RequireLiteralType( 850 VD->getLocation(), VD->getType(), 851 diag::err_constexpr_local_var_non_literal_type, 852 isa<CXXConstructorDecl>(Dcl))) 853 return false; 854 if (!VD->hasInit()) { 855 SemaRef.Diag(VD->getLocation(), 856 diag::err_constexpr_local_var_no_init) 857 << isa<CXXConstructorDecl>(Dcl); 858 return false; 859 } 860 } 861 SemaRef.Diag(VD->getLocation(), 862 SemaRef.getLangOpts().CPlusPlus1y 863 ? diag::warn_cxx11_compat_constexpr_local_var 864 : diag::ext_constexpr_local_var) 865 << isa<CXXConstructorDecl>(Dcl); 866 continue; 867 } 868 869 case Decl::NamespaceAlias: 870 case Decl::Function: 871 // These are disallowed in C++11 and permitted in C++1y. Allow them 872 // everywhere as an extension. 873 if (!Cxx1yLoc.isValid()) 874 Cxx1yLoc = DS->getLocStart(); 875 continue; 876 877 default: 878 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 879 << isa<CXXConstructorDecl>(Dcl); 880 return false; 881 } 882 } 883 884 return true; 885} 886 887/// Check that the given field is initialized within a constexpr constructor. 888/// 889/// \param Dcl The constexpr constructor being checked. 890/// \param Field The field being checked. This may be a member of an anonymous 891/// struct or union nested within the class being checked. 892/// \param Inits All declarations, including anonymous struct/union members and 893/// indirect members, for which any initialization was provided. 894/// \param Diagnosed Set to true if an error is produced. 895static void CheckConstexprCtorInitializer(Sema &SemaRef, 896 const FunctionDecl *Dcl, 897 FieldDecl *Field, 898 llvm::SmallSet<Decl*, 16> &Inits, 899 bool &Diagnosed) { 900 if (Field->isUnnamedBitfield()) 901 return; 902 903 if (Field->isAnonymousStructOrUnion() && 904 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 905 return; 906 907 if (!Inits.count(Field)) { 908 if (!Diagnosed) { 909 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 910 Diagnosed = true; 911 } 912 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 913 } else if (Field->isAnonymousStructOrUnion()) { 914 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 915 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 916 I != E; ++I) 917 // If an anonymous union contains an anonymous struct of which any member 918 // is initialized, all members must be initialized. 919 if (!RD->isUnion() || Inits.count(*I)) 920 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 921 } 922} 923 924/// Check the provided statement is allowed in a constexpr function 925/// definition. 926static bool 927CheckConstexprFunctionStmt(Sema &SemaRef, const FunctionDecl *Dcl, Stmt *S, 928 llvm::SmallVectorImpl<SourceLocation> &ReturnStmts, 929 SourceLocation &Cxx1yLoc) { 930 // - its function-body shall be [...] a compound-statement that contains only 931 switch (S->getStmtClass()) { 932 case Stmt::NullStmtClass: 933 // - null statements, 934 return true; 935 936 case Stmt::DeclStmtClass: 937 // - static_assert-declarations 938 // - using-declarations, 939 // - using-directives, 940 // - typedef declarations and alias-declarations that do not define 941 // classes or enumerations, 942 if (!CheckConstexprDeclStmt(SemaRef, Dcl, cast<DeclStmt>(S), Cxx1yLoc)) 943 return false; 944 return true; 945 946 case Stmt::ReturnStmtClass: 947 // - and exactly one return statement; 948 if (isa<CXXConstructorDecl>(Dcl)) { 949 // C++1y allows return statements in constexpr constructors. 950 if (!Cxx1yLoc.isValid()) 951 Cxx1yLoc = S->getLocStart(); 952 return true; 953 } 954 955 ReturnStmts.push_back(S->getLocStart()); 956 return true; 957 958 case Stmt::CompoundStmtClass: { 959 // C++1y allows compound-statements. 960 if (!Cxx1yLoc.isValid()) 961 Cxx1yLoc = S->getLocStart(); 962 963 CompoundStmt *CompStmt = cast<CompoundStmt>(S); 964 for (CompoundStmt::body_iterator BodyIt = CompStmt->body_begin(), 965 BodyEnd = CompStmt->body_end(); BodyIt != BodyEnd; ++BodyIt) { 966 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, *BodyIt, ReturnStmts, 967 Cxx1yLoc)) 968 return false; 969 } 970 return true; 971 } 972 973 case Stmt::AttributedStmtClass: 974 if (!Cxx1yLoc.isValid()) 975 Cxx1yLoc = S->getLocStart(); 976 return true; 977 978 case Stmt::IfStmtClass: { 979 // C++1y allows if-statements. 980 if (!Cxx1yLoc.isValid()) 981 Cxx1yLoc = S->getLocStart(); 982 983 IfStmt *If = cast<IfStmt>(S); 984 if (!CheckConstexprFunctionStmt(SemaRef, Dcl, If->getThen(), ReturnStmts, 985 Cxx1yLoc)) 986 return false; 987 if (If->getElse() && 988 !CheckConstexprFunctionStmt(SemaRef, Dcl, If->getElse(), ReturnStmts, 989 Cxx1yLoc)) 990 return false; 991 return true; 992 } 993 994 case Stmt::WhileStmtClass: 995 case Stmt::DoStmtClass: 996 case Stmt::ForStmtClass: 997 case Stmt::CXXForRangeStmtClass: 998 case Stmt::ContinueStmtClass: 999 // C++1y allows all of these. We don't allow them as extensions in C++11, 1000 // because they don't make sense without variable mutation. 1001 if (!SemaRef.getLangOpts().CPlusPlus1y) 1002 break; 1003 if (!Cxx1yLoc.isValid()) 1004 Cxx1yLoc = S->getLocStart(); 1005 for (Stmt::child_range Children = S->children(); Children; ++Children) 1006 if (*Children && 1007 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1008 Cxx1yLoc)) 1009 return false; 1010 return true; 1011 1012 case Stmt::SwitchStmtClass: 1013 case Stmt::CaseStmtClass: 1014 case Stmt::DefaultStmtClass: 1015 case Stmt::BreakStmtClass: 1016 // C++1y allows switch-statements, and since they don't need variable 1017 // mutation, we can reasonably allow them in C++11 as an extension. 1018 if (!Cxx1yLoc.isValid()) 1019 Cxx1yLoc = S->getLocStart(); 1020 for (Stmt::child_range Children = S->children(); Children; ++Children) 1021 if (*Children && 1022 !CheckConstexprFunctionStmt(SemaRef, Dcl, *Children, ReturnStmts, 1023 Cxx1yLoc)) 1024 return false; 1025 return true; 1026 1027 default: 1028 if (!isa<Expr>(S)) 1029 break; 1030 1031 // C++1y allows expression-statements. 1032 if (!Cxx1yLoc.isValid()) 1033 Cxx1yLoc = S->getLocStart(); 1034 return true; 1035 } 1036 1037 SemaRef.Diag(S->getLocStart(), diag::err_constexpr_body_invalid_stmt) 1038 << isa<CXXConstructorDecl>(Dcl); 1039 return false; 1040} 1041 1042/// Check the body for the given constexpr function declaration only contains 1043/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 1044/// 1045/// \return true if the body is OK, false if we have diagnosed a problem. 1046bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 1047 if (isa<CXXTryStmt>(Body)) { 1048 // C++11 [dcl.constexpr]p3: 1049 // The definition of a constexpr function shall satisfy the following 1050 // constraints: [...] 1051 // - its function-body shall be = delete, = default, or a 1052 // compound-statement 1053 // 1054 // C++11 [dcl.constexpr]p4: 1055 // In the definition of a constexpr constructor, [...] 1056 // - its function-body shall not be a function-try-block; 1057 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 1058 << isa<CXXConstructorDecl>(Dcl); 1059 return false; 1060 } 1061 1062 SmallVector<SourceLocation, 4> ReturnStmts; 1063 1064 // - its function-body shall be [...] a compound-statement that contains only 1065 // [... list of cases ...] 1066 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 1067 SourceLocation Cxx1yLoc; 1068 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 1069 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 1070 if (!CheckConstexprFunctionStmt(*this, Dcl, *BodyIt, ReturnStmts, Cxx1yLoc)) 1071 return false; 1072 } 1073 1074 if (Cxx1yLoc.isValid()) 1075 Diag(Cxx1yLoc, 1076 getLangOpts().CPlusPlus1y 1077 ? diag::warn_cxx11_compat_constexpr_body_invalid_stmt 1078 : diag::ext_constexpr_body_invalid_stmt) 1079 << isa<CXXConstructorDecl>(Dcl); 1080 1081 if (const CXXConstructorDecl *Constructor 1082 = dyn_cast<CXXConstructorDecl>(Dcl)) { 1083 const CXXRecordDecl *RD = Constructor->getParent(); 1084 // DR1359: 1085 // - every non-variant non-static data member and base class sub-object 1086 // shall be initialized; 1087 // - if the class is a non-empty union, or for each non-empty anonymous 1088 // union member of a non-union class, exactly one non-static data member 1089 // shall be initialized; 1090 if (RD->isUnion()) { 1091 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 1092 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 1093 return false; 1094 } 1095 } else if (!Constructor->isDependentContext() && 1096 !Constructor->isDelegatingConstructor()) { 1097 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 1098 1099 // Skip detailed checking if we have enough initializers, and we would 1100 // allow at most one initializer per member. 1101 bool AnyAnonStructUnionMembers = false; 1102 unsigned Fields = 0; 1103 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1104 E = RD->field_end(); I != E; ++I, ++Fields) { 1105 if (I->isAnonymousStructOrUnion()) { 1106 AnyAnonStructUnionMembers = true; 1107 break; 1108 } 1109 } 1110 if (AnyAnonStructUnionMembers || 1111 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 1112 // Check initialization of non-static data members. Base classes are 1113 // always initialized so do not need to be checked. Dependent bases 1114 // might not have initializers in the member initializer list. 1115 llvm::SmallSet<Decl*, 16> Inits; 1116 for (CXXConstructorDecl::init_const_iterator 1117 I = Constructor->init_begin(), E = Constructor->init_end(); 1118 I != E; ++I) { 1119 if (FieldDecl *FD = (*I)->getMember()) 1120 Inits.insert(FD); 1121 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 1122 Inits.insert(ID->chain_begin(), ID->chain_end()); 1123 } 1124 1125 bool Diagnosed = false; 1126 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 1127 E = RD->field_end(); I != E; ++I) 1128 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 1129 if (Diagnosed) 1130 return false; 1131 } 1132 } 1133 } else { 1134 if (ReturnStmts.empty()) { 1135 // C++1y doesn't require constexpr functions to contain a 'return' 1136 // statement. We still do, unless the return type is void, because 1137 // otherwise if there's no return statement, the function cannot 1138 // be used in a core constant expression. 1139 bool OK = getLangOpts().CPlusPlus1y && Dcl->getResultType()->isVoidType(); 1140 Diag(Dcl->getLocation(), 1141 OK ? diag::warn_cxx11_compat_constexpr_body_no_return 1142 : diag::err_constexpr_body_no_return); 1143 return OK; 1144 } 1145 if (ReturnStmts.size() > 1) { 1146 Diag(ReturnStmts.back(), 1147 getLangOpts().CPlusPlus1y 1148 ? diag::warn_cxx11_compat_constexpr_body_multiple_return 1149 : diag::ext_constexpr_body_multiple_return); 1150 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 1151 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 1152 } 1153 } 1154 1155 // C++11 [dcl.constexpr]p5: 1156 // if no function argument values exist such that the function invocation 1157 // substitution would produce a constant expression, the program is 1158 // ill-formed; no diagnostic required. 1159 // C++11 [dcl.constexpr]p3: 1160 // - every constructor call and implicit conversion used in initializing the 1161 // return value shall be one of those allowed in a constant expression. 1162 // C++11 [dcl.constexpr]p4: 1163 // - every constructor involved in initializing non-static data members and 1164 // base class sub-objects shall be a constexpr constructor. 1165 SmallVector<PartialDiagnosticAt, 8> Diags; 1166 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1167 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1168 << isa<CXXConstructorDecl>(Dcl); 1169 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1170 Diag(Diags[I].first, Diags[I].second); 1171 // Don't return false here: we allow this for compatibility in 1172 // system headers. 1173 } 1174 1175 return true; 1176} 1177 1178/// isCurrentClassName - Determine whether the identifier II is the 1179/// name of the class type currently being defined. In the case of 1180/// nested classes, this will only return true if II is the name of 1181/// the innermost class. 1182bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1183 const CXXScopeSpec *SS) { 1184 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1185 1186 CXXRecordDecl *CurDecl; 1187 if (SS && SS->isSet() && !SS->isInvalid()) { 1188 DeclContext *DC = computeDeclContext(*SS, true); 1189 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1190 } else 1191 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1192 1193 if (CurDecl && CurDecl->getIdentifier()) 1194 return &II == CurDecl->getIdentifier(); 1195 else 1196 return false; 1197} 1198 1199/// \brief Determine whether the given class is a base class of the given 1200/// class, including looking at dependent bases. 1201static bool findCircularInheritance(const CXXRecordDecl *Class, 1202 const CXXRecordDecl *Current) { 1203 SmallVector<const CXXRecordDecl*, 8> Queue; 1204 1205 Class = Class->getCanonicalDecl(); 1206 while (true) { 1207 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1208 E = Current->bases_end(); 1209 I != E; ++I) { 1210 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1211 if (!Base) 1212 continue; 1213 1214 Base = Base->getDefinition(); 1215 if (!Base) 1216 continue; 1217 1218 if (Base->getCanonicalDecl() == Class) 1219 return true; 1220 1221 Queue.push_back(Base); 1222 } 1223 1224 if (Queue.empty()) 1225 return false; 1226 1227 Current = Queue.back(); 1228 Queue.pop_back(); 1229 } 1230 1231 return false; 1232} 1233 1234/// \brief Check the validity of a C++ base class specifier. 1235/// 1236/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1237/// and returns NULL otherwise. 1238CXXBaseSpecifier * 1239Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1240 SourceRange SpecifierRange, 1241 bool Virtual, AccessSpecifier Access, 1242 TypeSourceInfo *TInfo, 1243 SourceLocation EllipsisLoc) { 1244 QualType BaseType = TInfo->getType(); 1245 1246 // C++ [class.union]p1: 1247 // A union shall not have base classes. 1248 if (Class->isUnion()) { 1249 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1250 << SpecifierRange; 1251 return 0; 1252 } 1253 1254 if (EllipsisLoc.isValid() && 1255 !TInfo->getType()->containsUnexpandedParameterPack()) { 1256 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1257 << TInfo->getTypeLoc().getSourceRange(); 1258 EllipsisLoc = SourceLocation(); 1259 } 1260 1261 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1262 1263 if (BaseType->isDependentType()) { 1264 // Make sure that we don't have circular inheritance among our dependent 1265 // bases. For non-dependent bases, the check for completeness below handles 1266 // this. 1267 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1268 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1269 ((BaseDecl = BaseDecl->getDefinition()) && 1270 findCircularInheritance(Class, BaseDecl))) { 1271 Diag(BaseLoc, diag::err_circular_inheritance) 1272 << BaseType << Context.getTypeDeclType(Class); 1273 1274 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1275 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1276 << BaseType; 1277 1278 return 0; 1279 } 1280 } 1281 1282 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1283 Class->getTagKind() == TTK_Class, 1284 Access, TInfo, EllipsisLoc); 1285 } 1286 1287 // Base specifiers must be record types. 1288 if (!BaseType->isRecordType()) { 1289 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1290 return 0; 1291 } 1292 1293 // C++ [class.union]p1: 1294 // A union shall not be used as a base class. 1295 if (BaseType->isUnionType()) { 1296 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1297 return 0; 1298 } 1299 1300 // C++ [class.derived]p2: 1301 // The class-name in a base-specifier shall not be an incompletely 1302 // defined class. 1303 if (RequireCompleteType(BaseLoc, BaseType, 1304 diag::err_incomplete_base_class, SpecifierRange)) { 1305 Class->setInvalidDecl(); 1306 return 0; 1307 } 1308 1309 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1310 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1311 assert(BaseDecl && "Record type has no declaration"); 1312 BaseDecl = BaseDecl->getDefinition(); 1313 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1314 CXXRecordDecl *CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1315 assert(CXXBaseDecl && "Base type is not a C++ type"); 1316 1317 // C++ [class]p3: 1318 // If a class is marked final and it appears as a base-type-specifier in 1319 // base-clause, the program is ill-formed. 1320 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1321 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1322 << CXXBaseDecl->getDeclName(); 1323 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1324 << CXXBaseDecl->getDeclName(); 1325 return 0; 1326 } 1327 1328 if (BaseDecl->isInvalidDecl()) 1329 Class->setInvalidDecl(); 1330 1331 // Create the base specifier. 1332 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1333 Class->getTagKind() == TTK_Class, 1334 Access, TInfo, EllipsisLoc); 1335} 1336 1337/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1338/// one entry in the base class list of a class specifier, for 1339/// example: 1340/// class foo : public bar, virtual private baz { 1341/// 'public bar' and 'virtual private baz' are each base-specifiers. 1342BaseResult 1343Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1344 ParsedAttributes &Attributes, 1345 bool Virtual, AccessSpecifier Access, 1346 ParsedType basetype, SourceLocation BaseLoc, 1347 SourceLocation EllipsisLoc) { 1348 if (!classdecl) 1349 return true; 1350 1351 AdjustDeclIfTemplate(classdecl); 1352 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1353 if (!Class) 1354 return true; 1355 1356 // We do not support any C++11 attributes on base-specifiers yet. 1357 // Diagnose any attributes we see. 1358 if (!Attributes.empty()) { 1359 for (AttributeList *Attr = Attributes.getList(); Attr; 1360 Attr = Attr->getNext()) { 1361 if (Attr->isInvalid() || 1362 Attr->getKind() == AttributeList::IgnoredAttribute) 1363 continue; 1364 Diag(Attr->getLoc(), 1365 Attr->getKind() == AttributeList::UnknownAttribute 1366 ? diag::warn_unknown_attribute_ignored 1367 : diag::err_base_specifier_attribute) 1368 << Attr->getName(); 1369 } 1370 } 1371 1372 TypeSourceInfo *TInfo = 0; 1373 GetTypeFromParser(basetype, &TInfo); 1374 1375 if (EllipsisLoc.isInvalid() && 1376 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1377 UPPC_BaseType)) 1378 return true; 1379 1380 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1381 Virtual, Access, TInfo, 1382 EllipsisLoc)) 1383 return BaseSpec; 1384 else 1385 Class->setInvalidDecl(); 1386 1387 return true; 1388} 1389 1390/// \brief Performs the actual work of attaching the given base class 1391/// specifiers to a C++ class. 1392bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1393 unsigned NumBases) { 1394 if (NumBases == 0) 1395 return false; 1396 1397 // Used to keep track of which base types we have already seen, so 1398 // that we can properly diagnose redundant direct base types. Note 1399 // that the key is always the unqualified canonical type of the base 1400 // class. 1401 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1402 1403 // Copy non-redundant base specifiers into permanent storage. 1404 unsigned NumGoodBases = 0; 1405 bool Invalid = false; 1406 for (unsigned idx = 0; idx < NumBases; ++idx) { 1407 QualType NewBaseType 1408 = Context.getCanonicalType(Bases[idx]->getType()); 1409 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1410 1411 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1412 if (KnownBase) { 1413 // C++ [class.mi]p3: 1414 // A class shall not be specified as a direct base class of a 1415 // derived class more than once. 1416 Diag(Bases[idx]->getLocStart(), 1417 diag::err_duplicate_base_class) 1418 << KnownBase->getType() 1419 << Bases[idx]->getSourceRange(); 1420 1421 // Delete the duplicate base class specifier; we're going to 1422 // overwrite its pointer later. 1423 Context.Deallocate(Bases[idx]); 1424 1425 Invalid = true; 1426 } else { 1427 // Okay, add this new base class. 1428 KnownBase = Bases[idx]; 1429 Bases[NumGoodBases++] = Bases[idx]; 1430 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1431 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1432 if (Class->isInterface() && 1433 (!RD->isInterface() || 1434 KnownBase->getAccessSpecifier() != AS_public)) { 1435 // The Microsoft extension __interface does not permit bases that 1436 // are not themselves public interfaces. 1437 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1438 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1439 << RD->getSourceRange(); 1440 Invalid = true; 1441 } 1442 if (RD->hasAttr<WeakAttr>()) 1443 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1444 } 1445 } 1446 } 1447 1448 // Attach the remaining base class specifiers to the derived class. 1449 Class->setBases(Bases, NumGoodBases); 1450 1451 // Delete the remaining (good) base class specifiers, since their 1452 // data has been copied into the CXXRecordDecl. 1453 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1454 Context.Deallocate(Bases[idx]); 1455 1456 return Invalid; 1457} 1458 1459/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1460/// class, after checking whether there are any duplicate base 1461/// classes. 1462void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1463 unsigned NumBases) { 1464 if (!ClassDecl || !Bases || !NumBases) 1465 return; 1466 1467 AdjustDeclIfTemplate(ClassDecl); 1468 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1469 (CXXBaseSpecifier**)(Bases), NumBases); 1470} 1471 1472/// \brief Determine whether the type \p Derived is a C++ class that is 1473/// derived from the type \p Base. 1474bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1475 if (!getLangOpts().CPlusPlus) 1476 return false; 1477 1478 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1479 if (!DerivedRD) 1480 return false; 1481 1482 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1483 if (!BaseRD) 1484 return false; 1485 1486 // If either the base or the derived type is invalid, don't try to 1487 // check whether one is derived from the other. 1488 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1489 return false; 1490 1491 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1492 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1493} 1494 1495/// \brief Determine whether the type \p Derived is a C++ class that is 1496/// derived from the type \p Base. 1497bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1498 if (!getLangOpts().CPlusPlus) 1499 return false; 1500 1501 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1502 if (!DerivedRD) 1503 return false; 1504 1505 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1506 if (!BaseRD) 1507 return false; 1508 1509 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1510} 1511 1512void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1513 CXXCastPath &BasePathArray) { 1514 assert(BasePathArray.empty() && "Base path array must be empty!"); 1515 assert(Paths.isRecordingPaths() && "Must record paths!"); 1516 1517 const CXXBasePath &Path = Paths.front(); 1518 1519 // We first go backward and check if we have a virtual base. 1520 // FIXME: It would be better if CXXBasePath had the base specifier for 1521 // the nearest virtual base. 1522 unsigned Start = 0; 1523 for (unsigned I = Path.size(); I != 0; --I) { 1524 if (Path[I - 1].Base->isVirtual()) { 1525 Start = I - 1; 1526 break; 1527 } 1528 } 1529 1530 // Now add all bases. 1531 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1532 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1533} 1534 1535/// \brief Determine whether the given base path includes a virtual 1536/// base class. 1537bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1538 for (CXXCastPath::const_iterator B = BasePath.begin(), 1539 BEnd = BasePath.end(); 1540 B != BEnd; ++B) 1541 if ((*B)->isVirtual()) 1542 return true; 1543 1544 return false; 1545} 1546 1547/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1548/// conversion (where Derived and Base are class types) is 1549/// well-formed, meaning that the conversion is unambiguous (and 1550/// that all of the base classes are accessible). Returns true 1551/// and emits a diagnostic if the code is ill-formed, returns false 1552/// otherwise. Loc is the location where this routine should point to 1553/// if there is an error, and Range is the source range to highlight 1554/// if there is an error. 1555bool 1556Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1557 unsigned InaccessibleBaseID, 1558 unsigned AmbigiousBaseConvID, 1559 SourceLocation Loc, SourceRange Range, 1560 DeclarationName Name, 1561 CXXCastPath *BasePath) { 1562 // First, determine whether the path from Derived to Base is 1563 // ambiguous. This is slightly more expensive than checking whether 1564 // the Derived to Base conversion exists, because here we need to 1565 // explore multiple paths to determine if there is an ambiguity. 1566 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1567 /*DetectVirtual=*/false); 1568 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1569 assert(DerivationOkay && 1570 "Can only be used with a derived-to-base conversion"); 1571 (void)DerivationOkay; 1572 1573 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1574 if (InaccessibleBaseID) { 1575 // Check that the base class can be accessed. 1576 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1577 InaccessibleBaseID)) { 1578 case AR_inaccessible: 1579 return true; 1580 case AR_accessible: 1581 case AR_dependent: 1582 case AR_delayed: 1583 break; 1584 } 1585 } 1586 1587 // Build a base path if necessary. 1588 if (BasePath) 1589 BuildBasePathArray(Paths, *BasePath); 1590 return false; 1591 } 1592 1593 // We know that the derived-to-base conversion is ambiguous, and 1594 // we're going to produce a diagnostic. Perform the derived-to-base 1595 // search just one more time to compute all of the possible paths so 1596 // that we can print them out. This is more expensive than any of 1597 // the previous derived-to-base checks we've done, but at this point 1598 // performance isn't as much of an issue. 1599 Paths.clear(); 1600 Paths.setRecordingPaths(true); 1601 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1602 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1603 (void)StillOkay; 1604 1605 // Build up a textual representation of the ambiguous paths, e.g., 1606 // D -> B -> A, that will be used to illustrate the ambiguous 1607 // conversions in the diagnostic. We only print one of the paths 1608 // to each base class subobject. 1609 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1610 1611 Diag(Loc, AmbigiousBaseConvID) 1612 << Derived << Base << PathDisplayStr << Range << Name; 1613 return true; 1614} 1615 1616bool 1617Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1618 SourceLocation Loc, SourceRange Range, 1619 CXXCastPath *BasePath, 1620 bool IgnoreAccess) { 1621 return CheckDerivedToBaseConversion(Derived, Base, 1622 IgnoreAccess ? 0 1623 : diag::err_upcast_to_inaccessible_base, 1624 diag::err_ambiguous_derived_to_base_conv, 1625 Loc, Range, DeclarationName(), 1626 BasePath); 1627} 1628 1629 1630/// @brief Builds a string representing ambiguous paths from a 1631/// specific derived class to different subobjects of the same base 1632/// class. 1633/// 1634/// This function builds a string that can be used in error messages 1635/// to show the different paths that one can take through the 1636/// inheritance hierarchy to go from the derived class to different 1637/// subobjects of a base class. The result looks something like this: 1638/// @code 1639/// struct D -> struct B -> struct A 1640/// struct D -> struct C -> struct A 1641/// @endcode 1642std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1643 std::string PathDisplayStr; 1644 std::set<unsigned> DisplayedPaths; 1645 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1646 Path != Paths.end(); ++Path) { 1647 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1648 // We haven't displayed a path to this particular base 1649 // class subobject yet. 1650 PathDisplayStr += "\n "; 1651 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1652 for (CXXBasePath::const_iterator Element = Path->begin(); 1653 Element != Path->end(); ++Element) 1654 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1655 } 1656 } 1657 1658 return PathDisplayStr; 1659} 1660 1661//===----------------------------------------------------------------------===// 1662// C++ class member Handling 1663//===----------------------------------------------------------------------===// 1664 1665/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1666bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1667 SourceLocation ASLoc, 1668 SourceLocation ColonLoc, 1669 AttributeList *Attrs) { 1670 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1671 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1672 ASLoc, ColonLoc); 1673 CurContext->addHiddenDecl(ASDecl); 1674 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1675} 1676 1677/// CheckOverrideControl - Check C++11 override control semantics. 1678void Sema::CheckOverrideControl(Decl *D) { 1679 if (D->isInvalidDecl()) 1680 return; 1681 1682 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1683 1684 // Do we know which functions this declaration might be overriding? 1685 bool OverridesAreKnown = !MD || 1686 (!MD->getParent()->hasAnyDependentBases() && 1687 !MD->getType()->isDependentType()); 1688 1689 if (!MD || !MD->isVirtual()) { 1690 if (OverridesAreKnown) { 1691 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1692 Diag(OA->getLocation(), 1693 diag::override_keyword_only_allowed_on_virtual_member_functions) 1694 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1695 D->dropAttr<OverrideAttr>(); 1696 } 1697 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1698 Diag(FA->getLocation(), 1699 diag::override_keyword_only_allowed_on_virtual_member_functions) 1700 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1701 D->dropAttr<FinalAttr>(); 1702 } 1703 } 1704 return; 1705 } 1706 1707 if (!OverridesAreKnown) 1708 return; 1709 1710 // C++11 [class.virtual]p5: 1711 // If a virtual function is marked with the virt-specifier override and 1712 // does not override a member function of a base class, the program is 1713 // ill-formed. 1714 bool HasOverriddenMethods = 1715 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1716 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1717 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1718 << MD->getDeclName(); 1719} 1720 1721/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1722/// function overrides a virtual member function marked 'final', according to 1723/// C++11 [class.virtual]p4. 1724bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1725 const CXXMethodDecl *Old) { 1726 if (!Old->hasAttr<FinalAttr>()) 1727 return false; 1728 1729 Diag(New->getLocation(), diag::err_final_function_overridden) 1730 << New->getDeclName(); 1731 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1732 return true; 1733} 1734 1735static bool InitializationHasSideEffects(const FieldDecl &FD) { 1736 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1737 // FIXME: Destruction of ObjC lifetime types has side-effects. 1738 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1739 return !RD->isCompleteDefinition() || 1740 !RD->hasTrivialDefaultConstructor() || 1741 !RD->hasTrivialDestructor(); 1742 return false; 1743} 1744 1745static AttributeList *getMSPropertyAttr(AttributeList *list) { 1746 for (AttributeList* it = list; it != 0; it = it->getNext()) 1747 if (it->isDeclspecPropertyAttribute()) 1748 return it; 1749 return 0; 1750} 1751 1752/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1753/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1754/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1755/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1756/// present (but parsing it has been deferred). 1757NamedDecl * 1758Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1759 MultiTemplateParamsArg TemplateParameterLists, 1760 Expr *BW, const VirtSpecifiers &VS, 1761 InClassInitStyle InitStyle) { 1762 const DeclSpec &DS = D.getDeclSpec(); 1763 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1764 DeclarationName Name = NameInfo.getName(); 1765 SourceLocation Loc = NameInfo.getLoc(); 1766 1767 // For anonymous bitfields, the location should point to the type. 1768 if (Loc.isInvalid()) 1769 Loc = D.getLocStart(); 1770 1771 Expr *BitWidth = static_cast<Expr*>(BW); 1772 1773 assert(isa<CXXRecordDecl>(CurContext)); 1774 assert(!DS.isFriendSpecified()); 1775 1776 bool isFunc = D.isDeclarationOfFunction(); 1777 1778 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1779 // The Microsoft extension __interface only permits public member functions 1780 // and prohibits constructors, destructors, operators, non-public member 1781 // functions, static methods and data members. 1782 unsigned InvalidDecl; 1783 bool ShowDeclName = true; 1784 if (!isFunc) 1785 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1786 else if (AS != AS_public) 1787 InvalidDecl = 2; 1788 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1789 InvalidDecl = 3; 1790 else switch (Name.getNameKind()) { 1791 case DeclarationName::CXXConstructorName: 1792 InvalidDecl = 4; 1793 ShowDeclName = false; 1794 break; 1795 1796 case DeclarationName::CXXDestructorName: 1797 InvalidDecl = 5; 1798 ShowDeclName = false; 1799 break; 1800 1801 case DeclarationName::CXXOperatorName: 1802 case DeclarationName::CXXConversionFunctionName: 1803 InvalidDecl = 6; 1804 break; 1805 1806 default: 1807 InvalidDecl = 0; 1808 break; 1809 } 1810 1811 if (InvalidDecl) { 1812 if (ShowDeclName) 1813 Diag(Loc, diag::err_invalid_member_in_interface) 1814 << (InvalidDecl-1) << Name; 1815 else 1816 Diag(Loc, diag::err_invalid_member_in_interface) 1817 << (InvalidDecl-1) << ""; 1818 return 0; 1819 } 1820 } 1821 1822 // C++ 9.2p6: A member shall not be declared to have automatic storage 1823 // duration (auto, register) or with the extern storage-class-specifier. 1824 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1825 // data members and cannot be applied to names declared const or static, 1826 // and cannot be applied to reference members. 1827 switch (DS.getStorageClassSpec()) { 1828 case DeclSpec::SCS_unspecified: 1829 case DeclSpec::SCS_typedef: 1830 case DeclSpec::SCS_static: 1831 break; 1832 case DeclSpec::SCS_mutable: 1833 if (isFunc) { 1834 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1835 1836 // FIXME: It would be nicer if the keyword was ignored only for this 1837 // declarator. Otherwise we could get follow-up errors. 1838 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1839 } 1840 break; 1841 default: 1842 Diag(DS.getStorageClassSpecLoc(), 1843 diag::err_storageclass_invalid_for_member); 1844 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1845 break; 1846 } 1847 1848 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1849 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1850 !isFunc); 1851 1852 if (DS.isConstexprSpecified() && isInstField) { 1853 SemaDiagnosticBuilder B = 1854 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1855 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1856 if (InitStyle == ICIS_NoInit) { 1857 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1858 D.getMutableDeclSpec().ClearConstexprSpec(); 1859 const char *PrevSpec; 1860 unsigned DiagID; 1861 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1862 PrevSpec, DiagID, getLangOpts()); 1863 (void)Failed; 1864 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1865 } else { 1866 B << 1; 1867 const char *PrevSpec; 1868 unsigned DiagID; 1869 if (D.getMutableDeclSpec().SetStorageClassSpec( 1870 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1871 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1872 "This is the only DeclSpec that should fail to be applied"); 1873 B << 1; 1874 } else { 1875 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1876 isInstField = false; 1877 } 1878 } 1879 } 1880 1881 NamedDecl *Member; 1882 if (isInstField) { 1883 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1884 1885 // Data members must have identifiers for names. 1886 if (!Name.isIdentifier()) { 1887 Diag(Loc, diag::err_bad_variable_name) 1888 << Name; 1889 return 0; 1890 } 1891 1892 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1893 1894 // Member field could not be with "template" keyword. 1895 // So TemplateParameterLists should be empty in this case. 1896 if (TemplateParameterLists.size()) { 1897 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1898 if (TemplateParams->size()) { 1899 // There is no such thing as a member field template. 1900 Diag(D.getIdentifierLoc(), diag::err_template_member) 1901 << II 1902 << SourceRange(TemplateParams->getTemplateLoc(), 1903 TemplateParams->getRAngleLoc()); 1904 } else { 1905 // There is an extraneous 'template<>' for this member. 1906 Diag(TemplateParams->getTemplateLoc(), 1907 diag::err_template_member_noparams) 1908 << II 1909 << SourceRange(TemplateParams->getTemplateLoc(), 1910 TemplateParams->getRAngleLoc()); 1911 } 1912 return 0; 1913 } 1914 1915 if (SS.isSet() && !SS.isInvalid()) { 1916 // The user provided a superfluous scope specifier inside a class 1917 // definition: 1918 // 1919 // class X { 1920 // int X::member; 1921 // }; 1922 if (DeclContext *DC = computeDeclContext(SS, false)) 1923 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1924 else 1925 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1926 << Name << SS.getRange(); 1927 1928 SS.clear(); 1929 } 1930 1931 AttributeList *MSPropertyAttr = 1932 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1933 if (MSPropertyAttr) { 1934 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1935 BitWidth, InitStyle, AS, MSPropertyAttr); 1936 isInstField = false; 1937 } else { 1938 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1939 BitWidth, InitStyle, AS); 1940 } 1941 assert(Member && "HandleField never returns null"); 1942 } else { 1943 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1944 1945 Member = HandleDeclarator(S, D, TemplateParameterLists); 1946 if (!Member) { 1947 return 0; 1948 } 1949 1950 // Non-instance-fields can't have a bitfield. 1951 if (BitWidth) { 1952 if (Member->isInvalidDecl()) { 1953 // don't emit another diagnostic. 1954 } else if (isa<VarDecl>(Member)) { 1955 // C++ 9.6p3: A bit-field shall not be a static member. 1956 // "static member 'A' cannot be a bit-field" 1957 Diag(Loc, diag::err_static_not_bitfield) 1958 << Name << BitWidth->getSourceRange(); 1959 } else if (isa<TypedefDecl>(Member)) { 1960 // "typedef member 'x' cannot be a bit-field" 1961 Diag(Loc, diag::err_typedef_not_bitfield) 1962 << Name << BitWidth->getSourceRange(); 1963 } else { 1964 // A function typedef ("typedef int f(); f a;"). 1965 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1966 Diag(Loc, diag::err_not_integral_type_bitfield) 1967 << Name << cast<ValueDecl>(Member)->getType() 1968 << BitWidth->getSourceRange(); 1969 } 1970 1971 BitWidth = 0; 1972 Member->setInvalidDecl(); 1973 } 1974 1975 Member->setAccess(AS); 1976 1977 // If we have declared a member function template, set the access of the 1978 // templated declaration as well. 1979 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1980 FunTmpl->getTemplatedDecl()->setAccess(AS); 1981 } 1982 1983 if (VS.isOverrideSpecified()) 1984 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1985 if (VS.isFinalSpecified()) 1986 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1987 1988 if (VS.getLastLocation().isValid()) { 1989 // Update the end location of a method that has a virt-specifiers. 1990 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1991 MD->setRangeEnd(VS.getLastLocation()); 1992 } 1993 1994 CheckOverrideControl(Member); 1995 1996 assert((Name || isInstField) && "No identifier for non-field ?"); 1997 1998 if (isInstField) { 1999 FieldDecl *FD = cast<FieldDecl>(Member); 2000 FieldCollector->Add(FD); 2001 2002 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 2003 FD->getLocation()) 2004 != DiagnosticsEngine::Ignored) { 2005 // Remember all explicit private FieldDecls that have a name, no side 2006 // effects and are not part of a dependent type declaration. 2007 if (!FD->isImplicit() && FD->getDeclName() && 2008 FD->getAccess() == AS_private && 2009 !FD->hasAttr<UnusedAttr>() && 2010 !FD->getParent()->isDependentContext() && 2011 !InitializationHasSideEffects(*FD)) 2012 UnusedPrivateFields.insert(FD); 2013 } 2014 } 2015 2016 return Member; 2017} 2018 2019namespace { 2020 class UninitializedFieldVisitor 2021 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 2022 Sema &S; 2023 ValueDecl *VD; 2024 public: 2025 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 2026 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 2027 S(S) { 2028 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 2029 this->VD = IFD->getAnonField(); 2030 else 2031 this->VD = VD; 2032 } 2033 2034 void HandleExpr(Expr *E) { 2035 if (!E) return; 2036 2037 // Expressions like x(x) sometimes lack the surrounding expressions 2038 // but need to be checked anyways. 2039 HandleValue(E); 2040 Visit(E); 2041 } 2042 2043 void HandleValue(Expr *E) { 2044 E = E->IgnoreParens(); 2045 2046 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 2047 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 2048 return; 2049 2050 // FieldME is the inner-most MemberExpr that is not an anonymous struct 2051 // or union. 2052 MemberExpr *FieldME = ME; 2053 2054 Expr *Base = E; 2055 while (isa<MemberExpr>(Base)) { 2056 ME = cast<MemberExpr>(Base); 2057 2058 if (isa<VarDecl>(ME->getMemberDecl())) 2059 return; 2060 2061 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 2062 if (!FD->isAnonymousStructOrUnion()) 2063 FieldME = ME; 2064 2065 Base = ME->getBase(); 2066 } 2067 2068 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 2069 unsigned diag = VD->getType()->isReferenceType() 2070 ? diag::warn_reference_field_is_uninit 2071 : diag::warn_field_is_uninit; 2072 S.Diag(FieldME->getExprLoc(), diag) << VD; 2073 } 2074 return; 2075 } 2076 2077 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 2078 HandleValue(CO->getTrueExpr()); 2079 HandleValue(CO->getFalseExpr()); 2080 return; 2081 } 2082 2083 if (BinaryConditionalOperator *BCO = 2084 dyn_cast<BinaryConditionalOperator>(E)) { 2085 HandleValue(BCO->getCommon()); 2086 HandleValue(BCO->getFalseExpr()); 2087 return; 2088 } 2089 2090 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 2091 switch (BO->getOpcode()) { 2092 default: 2093 return; 2094 case(BO_PtrMemD): 2095 case(BO_PtrMemI): 2096 HandleValue(BO->getLHS()); 2097 return; 2098 case(BO_Comma): 2099 HandleValue(BO->getRHS()); 2100 return; 2101 } 2102 } 2103 } 2104 2105 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 2106 if (E->getCastKind() == CK_LValueToRValue) 2107 HandleValue(E->getSubExpr()); 2108 2109 Inherited::VisitImplicitCastExpr(E); 2110 } 2111 2112 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 2113 Expr *Callee = E->getCallee(); 2114 if (isa<MemberExpr>(Callee)) 2115 HandleValue(Callee); 2116 2117 Inherited::VisitCXXMemberCallExpr(E); 2118 } 2119 }; 2120 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 2121 ValueDecl *VD) { 2122 UninitializedFieldVisitor(S, VD).HandleExpr(E); 2123 } 2124} // namespace 2125 2126/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 2127/// in-class initializer for a non-static C++ class member, and after 2128/// instantiating an in-class initializer in a class template. Such actions 2129/// are deferred until the class is complete. 2130void 2131Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 2132 Expr *InitExpr) { 2133 FieldDecl *FD = cast<FieldDecl>(D); 2134 assert(FD->getInClassInitStyle() != ICIS_NoInit && 2135 "must set init style when field is created"); 2136 2137 if (!InitExpr) { 2138 FD->setInvalidDecl(); 2139 FD->removeInClassInitializer(); 2140 return; 2141 } 2142 2143 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 2144 FD->setInvalidDecl(); 2145 FD->removeInClassInitializer(); 2146 return; 2147 } 2148 2149 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 2150 != DiagnosticsEngine::Ignored) { 2151 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 2152 } 2153 2154 ExprResult Init = InitExpr; 2155 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2156 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2157 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2158 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2159 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2160 InitializationSequence Seq(*this, Entity, Kind, InitExpr); 2161 Init = Seq.Perform(*this, Entity, Kind, InitExpr); 2162 if (Init.isInvalid()) { 2163 FD->setInvalidDecl(); 2164 return; 2165 } 2166 } 2167 2168 // C++11 [class.base.init]p7: 2169 // The initialization of each base and member constitutes a 2170 // full-expression. 2171 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2172 if (Init.isInvalid()) { 2173 FD->setInvalidDecl(); 2174 return; 2175 } 2176 2177 InitExpr = Init.release(); 2178 2179 FD->setInClassInitializer(InitExpr); 2180} 2181 2182/// \brief Find the direct and/or virtual base specifiers that 2183/// correspond to the given base type, for use in base initialization 2184/// within a constructor. 2185static bool FindBaseInitializer(Sema &SemaRef, 2186 CXXRecordDecl *ClassDecl, 2187 QualType BaseType, 2188 const CXXBaseSpecifier *&DirectBaseSpec, 2189 const CXXBaseSpecifier *&VirtualBaseSpec) { 2190 // First, check for a direct base class. 2191 DirectBaseSpec = 0; 2192 for (CXXRecordDecl::base_class_const_iterator Base 2193 = ClassDecl->bases_begin(); 2194 Base != ClassDecl->bases_end(); ++Base) { 2195 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2196 // We found a direct base of this type. That's what we're 2197 // initializing. 2198 DirectBaseSpec = &*Base; 2199 break; 2200 } 2201 } 2202 2203 // Check for a virtual base class. 2204 // FIXME: We might be able to short-circuit this if we know in advance that 2205 // there are no virtual bases. 2206 VirtualBaseSpec = 0; 2207 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2208 // We haven't found a base yet; search the class hierarchy for a 2209 // virtual base class. 2210 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2211 /*DetectVirtual=*/false); 2212 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2213 BaseType, Paths)) { 2214 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2215 Path != Paths.end(); ++Path) { 2216 if (Path->back().Base->isVirtual()) { 2217 VirtualBaseSpec = Path->back().Base; 2218 break; 2219 } 2220 } 2221 } 2222 } 2223 2224 return DirectBaseSpec || VirtualBaseSpec; 2225} 2226 2227/// \brief Handle a C++ member initializer using braced-init-list syntax. 2228MemInitResult 2229Sema::ActOnMemInitializer(Decl *ConstructorD, 2230 Scope *S, 2231 CXXScopeSpec &SS, 2232 IdentifierInfo *MemberOrBase, 2233 ParsedType TemplateTypeTy, 2234 const DeclSpec &DS, 2235 SourceLocation IdLoc, 2236 Expr *InitList, 2237 SourceLocation EllipsisLoc) { 2238 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2239 DS, IdLoc, InitList, 2240 EllipsisLoc); 2241} 2242 2243/// \brief Handle a C++ member initializer using parentheses syntax. 2244MemInitResult 2245Sema::ActOnMemInitializer(Decl *ConstructorD, 2246 Scope *S, 2247 CXXScopeSpec &SS, 2248 IdentifierInfo *MemberOrBase, 2249 ParsedType TemplateTypeTy, 2250 const DeclSpec &DS, 2251 SourceLocation IdLoc, 2252 SourceLocation LParenLoc, 2253 ArrayRef<Expr *> Args, 2254 SourceLocation RParenLoc, 2255 SourceLocation EllipsisLoc) { 2256 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2257 Args, RParenLoc); 2258 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2259 DS, IdLoc, List, EllipsisLoc); 2260} 2261 2262namespace { 2263 2264// Callback to only accept typo corrections that can be a valid C++ member 2265// intializer: either a non-static field member or a base class. 2266class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2267 public: 2268 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2269 : ClassDecl(ClassDecl) {} 2270 2271 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2272 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2273 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2274 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2275 else 2276 return isa<TypeDecl>(ND); 2277 } 2278 return false; 2279 } 2280 2281 private: 2282 CXXRecordDecl *ClassDecl; 2283}; 2284 2285} 2286 2287/// \brief Handle a C++ member initializer. 2288MemInitResult 2289Sema::BuildMemInitializer(Decl *ConstructorD, 2290 Scope *S, 2291 CXXScopeSpec &SS, 2292 IdentifierInfo *MemberOrBase, 2293 ParsedType TemplateTypeTy, 2294 const DeclSpec &DS, 2295 SourceLocation IdLoc, 2296 Expr *Init, 2297 SourceLocation EllipsisLoc) { 2298 if (!ConstructorD) 2299 return true; 2300 2301 AdjustDeclIfTemplate(ConstructorD); 2302 2303 CXXConstructorDecl *Constructor 2304 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2305 if (!Constructor) { 2306 // The user wrote a constructor initializer on a function that is 2307 // not a C++ constructor. Ignore the error for now, because we may 2308 // have more member initializers coming; we'll diagnose it just 2309 // once in ActOnMemInitializers. 2310 return true; 2311 } 2312 2313 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2314 2315 // C++ [class.base.init]p2: 2316 // Names in a mem-initializer-id are looked up in the scope of the 2317 // constructor's class and, if not found in that scope, are looked 2318 // up in the scope containing the constructor's definition. 2319 // [Note: if the constructor's class contains a member with the 2320 // same name as a direct or virtual base class of the class, a 2321 // mem-initializer-id naming the member or base class and composed 2322 // of a single identifier refers to the class member. A 2323 // mem-initializer-id for the hidden base class may be specified 2324 // using a qualified name. ] 2325 if (!SS.getScopeRep() && !TemplateTypeTy) { 2326 // Look for a member, first. 2327 DeclContext::lookup_result Result 2328 = ClassDecl->lookup(MemberOrBase); 2329 if (!Result.empty()) { 2330 ValueDecl *Member; 2331 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2332 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2333 if (EllipsisLoc.isValid()) 2334 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2335 << MemberOrBase 2336 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2337 2338 return BuildMemberInitializer(Member, Init, IdLoc); 2339 } 2340 } 2341 } 2342 // It didn't name a member, so see if it names a class. 2343 QualType BaseType; 2344 TypeSourceInfo *TInfo = 0; 2345 2346 if (TemplateTypeTy) { 2347 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2348 } else if (DS.getTypeSpecType() == TST_decltype) { 2349 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2350 } else { 2351 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2352 LookupParsedName(R, S, &SS); 2353 2354 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2355 if (!TyD) { 2356 if (R.isAmbiguous()) return true; 2357 2358 // We don't want access-control diagnostics here. 2359 R.suppressDiagnostics(); 2360 2361 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2362 bool NotUnknownSpecialization = false; 2363 DeclContext *DC = computeDeclContext(SS, false); 2364 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2365 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2366 2367 if (!NotUnknownSpecialization) { 2368 // When the scope specifier can refer to a member of an unknown 2369 // specialization, we take it as a type name. 2370 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2371 SS.getWithLocInContext(Context), 2372 *MemberOrBase, IdLoc); 2373 if (BaseType.isNull()) 2374 return true; 2375 2376 R.clear(); 2377 R.setLookupName(MemberOrBase); 2378 } 2379 } 2380 2381 // If no results were found, try to correct typos. 2382 TypoCorrection Corr; 2383 MemInitializerValidatorCCC Validator(ClassDecl); 2384 if (R.empty() && BaseType.isNull() && 2385 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2386 Validator, ClassDecl))) { 2387 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2388 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2389 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2390 // We have found a non-static data member with a similar 2391 // name to what was typed; complain and initialize that 2392 // member. 2393 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2394 << MemberOrBase << true << CorrectedQuotedStr 2395 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2396 Diag(Member->getLocation(), diag::note_previous_decl) 2397 << CorrectedQuotedStr; 2398 2399 return BuildMemberInitializer(Member, Init, IdLoc); 2400 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2401 const CXXBaseSpecifier *DirectBaseSpec; 2402 const CXXBaseSpecifier *VirtualBaseSpec; 2403 if (FindBaseInitializer(*this, ClassDecl, 2404 Context.getTypeDeclType(Type), 2405 DirectBaseSpec, VirtualBaseSpec)) { 2406 // We have found a direct or virtual base class with a 2407 // similar name to what was typed; complain and initialize 2408 // that base class. 2409 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2410 << MemberOrBase << false << CorrectedQuotedStr 2411 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2412 2413 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2414 : VirtualBaseSpec; 2415 Diag(BaseSpec->getLocStart(), 2416 diag::note_base_class_specified_here) 2417 << BaseSpec->getType() 2418 << BaseSpec->getSourceRange(); 2419 2420 TyD = Type; 2421 } 2422 } 2423 } 2424 2425 if (!TyD && BaseType.isNull()) { 2426 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2427 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2428 return true; 2429 } 2430 } 2431 2432 if (BaseType.isNull()) { 2433 BaseType = Context.getTypeDeclType(TyD); 2434 if (SS.isSet()) { 2435 NestedNameSpecifier *Qualifier = 2436 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2437 2438 // FIXME: preserve source range information 2439 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2440 } 2441 } 2442 } 2443 2444 if (!TInfo) 2445 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2446 2447 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2448} 2449 2450/// Checks a member initializer expression for cases where reference (or 2451/// pointer) members are bound to by-value parameters (or their addresses). 2452static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2453 Expr *Init, 2454 SourceLocation IdLoc) { 2455 QualType MemberTy = Member->getType(); 2456 2457 // We only handle pointers and references currently. 2458 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2459 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2460 return; 2461 2462 const bool IsPointer = MemberTy->isPointerType(); 2463 if (IsPointer) { 2464 if (const UnaryOperator *Op 2465 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2466 // The only case we're worried about with pointers requires taking the 2467 // address. 2468 if (Op->getOpcode() != UO_AddrOf) 2469 return; 2470 2471 Init = Op->getSubExpr(); 2472 } else { 2473 // We only handle address-of expression initializers for pointers. 2474 return; 2475 } 2476 } 2477 2478 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2479 // We only warn when referring to a non-reference parameter declaration. 2480 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2481 if (!Parameter || Parameter->getType()->isReferenceType()) 2482 return; 2483 2484 S.Diag(Init->getExprLoc(), 2485 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2486 : diag::warn_bind_ref_member_to_parameter) 2487 << Member << Parameter << Init->getSourceRange(); 2488 } else { 2489 // Other initializers are fine. 2490 return; 2491 } 2492 2493 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2494 << (unsigned)IsPointer; 2495} 2496 2497MemInitResult 2498Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2499 SourceLocation IdLoc) { 2500 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2501 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2502 assert((DirectMember || IndirectMember) && 2503 "Member must be a FieldDecl or IndirectFieldDecl"); 2504 2505 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2506 return true; 2507 2508 if (Member->isInvalidDecl()) 2509 return true; 2510 2511 // Diagnose value-uses of fields to initialize themselves, e.g. 2512 // foo(foo) 2513 // where foo is not also a parameter to the constructor. 2514 // TODO: implement -Wuninitialized and fold this into that framework. 2515 MultiExprArg Args; 2516 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2517 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2518 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2519 Args = MultiExprArg(InitList->getInits(), InitList->getNumInits()); 2520 } else { 2521 // Template instantiation doesn't reconstruct ParenListExprs for us. 2522 Args = Init; 2523 } 2524 2525 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2526 != DiagnosticsEngine::Ignored) 2527 for (unsigned i = 0, e = Args.size(); i != e; ++i) 2528 // FIXME: Warn about the case when other fields are used before being 2529 // initialized. For example, let this field be the i'th field. When 2530 // initializing the i'th field, throw a warning if any of the >= i'th 2531 // fields are used, as they are not yet initialized. 2532 // Right now we are only handling the case where the i'th field uses 2533 // itself in its initializer. 2534 // Also need to take into account that some fields may be initialized by 2535 // in-class initializers, see C++11 [class.base.init]p9. 2536 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2537 2538 SourceRange InitRange = Init->getSourceRange(); 2539 2540 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2541 // Can't check initialization for a member of dependent type or when 2542 // any of the arguments are type-dependent expressions. 2543 DiscardCleanupsInEvaluationContext(); 2544 } else { 2545 bool InitList = false; 2546 if (isa<InitListExpr>(Init)) { 2547 InitList = true; 2548 Args = Init; 2549 } 2550 2551 // Initialize the member. 2552 InitializedEntity MemberEntity = 2553 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2554 : InitializedEntity::InitializeMember(IndirectMember, 0); 2555 InitializationKind Kind = 2556 InitList ? InitializationKind::CreateDirectList(IdLoc) 2557 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2558 InitRange.getEnd()); 2559 2560 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args); 2561 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, Args, 0); 2562 if (MemberInit.isInvalid()) 2563 return true; 2564 2565 CheckForDanglingReferenceOrPointer(*this, Member, MemberInit.get(), IdLoc); 2566 2567 // C++11 [class.base.init]p7: 2568 // The initialization of each base and member constitutes a 2569 // full-expression. 2570 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2571 if (MemberInit.isInvalid()) 2572 return true; 2573 2574 Init = MemberInit.get(); 2575 } 2576 2577 if (DirectMember) { 2578 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2579 InitRange.getBegin(), Init, 2580 InitRange.getEnd()); 2581 } else { 2582 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2583 InitRange.getBegin(), Init, 2584 InitRange.getEnd()); 2585 } 2586} 2587 2588MemInitResult 2589Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2590 CXXRecordDecl *ClassDecl) { 2591 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2592 if (!LangOpts.CPlusPlus11) 2593 return Diag(NameLoc, diag::err_delegating_ctor) 2594 << TInfo->getTypeLoc().getLocalSourceRange(); 2595 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2596 2597 bool InitList = true; 2598 MultiExprArg Args = Init; 2599 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2600 InitList = false; 2601 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2602 } 2603 2604 SourceRange InitRange = Init->getSourceRange(); 2605 // Initialize the object. 2606 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2607 QualType(ClassDecl->getTypeForDecl(), 0)); 2608 InitializationKind Kind = 2609 InitList ? InitializationKind::CreateDirectList(NameLoc) 2610 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2611 InitRange.getEnd()); 2612 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args); 2613 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2614 Args, 0); 2615 if (DelegationInit.isInvalid()) 2616 return true; 2617 2618 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2619 "Delegating constructor with no target?"); 2620 2621 // C++11 [class.base.init]p7: 2622 // The initialization of each base and member constitutes a 2623 // full-expression. 2624 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2625 InitRange.getBegin()); 2626 if (DelegationInit.isInvalid()) 2627 return true; 2628 2629 // If we are in a dependent context, template instantiation will 2630 // perform this type-checking again. Just save the arguments that we 2631 // received in a ParenListExpr. 2632 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2633 // of the information that we have about the base 2634 // initializer. However, deconstructing the ASTs is a dicey process, 2635 // and this approach is far more likely to get the corner cases right. 2636 if (CurContext->isDependentContext()) 2637 DelegationInit = Owned(Init); 2638 2639 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2640 DelegationInit.takeAs<Expr>(), 2641 InitRange.getEnd()); 2642} 2643 2644MemInitResult 2645Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2646 Expr *Init, CXXRecordDecl *ClassDecl, 2647 SourceLocation EllipsisLoc) { 2648 SourceLocation BaseLoc 2649 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2650 2651 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2652 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2653 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2654 2655 // C++ [class.base.init]p2: 2656 // [...] Unless the mem-initializer-id names a nonstatic data 2657 // member of the constructor's class or a direct or virtual base 2658 // of that class, the mem-initializer is ill-formed. A 2659 // mem-initializer-list can initialize a base class using any 2660 // name that denotes that base class type. 2661 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2662 2663 SourceRange InitRange = Init->getSourceRange(); 2664 if (EllipsisLoc.isValid()) { 2665 // This is a pack expansion. 2666 if (!BaseType->containsUnexpandedParameterPack()) { 2667 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2668 << SourceRange(BaseLoc, InitRange.getEnd()); 2669 2670 EllipsisLoc = SourceLocation(); 2671 } 2672 } else { 2673 // Check for any unexpanded parameter packs. 2674 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2675 return true; 2676 2677 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2678 return true; 2679 } 2680 2681 // Check for direct and virtual base classes. 2682 const CXXBaseSpecifier *DirectBaseSpec = 0; 2683 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2684 if (!Dependent) { 2685 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2686 BaseType)) 2687 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2688 2689 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2690 VirtualBaseSpec); 2691 2692 // C++ [base.class.init]p2: 2693 // Unless the mem-initializer-id names a nonstatic data member of the 2694 // constructor's class or a direct or virtual base of that class, the 2695 // mem-initializer is ill-formed. 2696 if (!DirectBaseSpec && !VirtualBaseSpec) { 2697 // If the class has any dependent bases, then it's possible that 2698 // one of those types will resolve to the same type as 2699 // BaseType. Therefore, just treat this as a dependent base 2700 // class initialization. FIXME: Should we try to check the 2701 // initialization anyway? It seems odd. 2702 if (ClassDecl->hasAnyDependentBases()) 2703 Dependent = true; 2704 else 2705 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2706 << BaseType << Context.getTypeDeclType(ClassDecl) 2707 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2708 } 2709 } 2710 2711 if (Dependent) { 2712 DiscardCleanupsInEvaluationContext(); 2713 2714 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2715 /*IsVirtual=*/false, 2716 InitRange.getBegin(), Init, 2717 InitRange.getEnd(), EllipsisLoc); 2718 } 2719 2720 // C++ [base.class.init]p2: 2721 // If a mem-initializer-id is ambiguous because it designates both 2722 // a direct non-virtual base class and an inherited virtual base 2723 // class, the mem-initializer is ill-formed. 2724 if (DirectBaseSpec && VirtualBaseSpec) 2725 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2726 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2727 2728 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2729 if (!BaseSpec) 2730 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2731 2732 // Initialize the base. 2733 bool InitList = true; 2734 MultiExprArg Args = Init; 2735 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2736 InitList = false; 2737 Args = MultiExprArg(ParenList->getExprs(), ParenList->getNumExprs()); 2738 } 2739 2740 InitializedEntity BaseEntity = 2741 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2742 InitializationKind Kind = 2743 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2744 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2745 InitRange.getEnd()); 2746 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args); 2747 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, Args, 0); 2748 if (BaseInit.isInvalid()) 2749 return true; 2750 2751 // C++11 [class.base.init]p7: 2752 // The initialization of each base and member constitutes a 2753 // full-expression. 2754 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2755 if (BaseInit.isInvalid()) 2756 return true; 2757 2758 // If we are in a dependent context, template instantiation will 2759 // perform this type-checking again. Just save the arguments that we 2760 // received in a ParenListExpr. 2761 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2762 // of the information that we have about the base 2763 // initializer. However, deconstructing the ASTs is a dicey process, 2764 // and this approach is far more likely to get the corner cases right. 2765 if (CurContext->isDependentContext()) 2766 BaseInit = Owned(Init); 2767 2768 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2769 BaseSpec->isVirtual(), 2770 InitRange.getBegin(), 2771 BaseInit.takeAs<Expr>(), 2772 InitRange.getEnd(), EllipsisLoc); 2773} 2774 2775// Create a static_cast\<T&&>(expr). 2776static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2777 if (T.isNull()) T = E->getType(); 2778 QualType TargetType = SemaRef.BuildReferenceType( 2779 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2780 SourceLocation ExprLoc = E->getLocStart(); 2781 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2782 TargetType, ExprLoc); 2783 2784 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2785 SourceRange(ExprLoc, ExprLoc), 2786 E->getSourceRange()).take(); 2787} 2788 2789/// ImplicitInitializerKind - How an implicit base or member initializer should 2790/// initialize its base or member. 2791enum ImplicitInitializerKind { 2792 IIK_Default, 2793 IIK_Copy, 2794 IIK_Move, 2795 IIK_Inherit 2796}; 2797 2798static bool 2799BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2800 ImplicitInitializerKind ImplicitInitKind, 2801 CXXBaseSpecifier *BaseSpec, 2802 bool IsInheritedVirtualBase, 2803 CXXCtorInitializer *&CXXBaseInit) { 2804 InitializedEntity InitEntity 2805 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2806 IsInheritedVirtualBase); 2807 2808 ExprResult BaseInit; 2809 2810 switch (ImplicitInitKind) { 2811 case IIK_Inherit: { 2812 const CXXRecordDecl *Inherited = 2813 Constructor->getInheritedConstructor()->getParent(); 2814 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2815 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2816 // C++11 [class.inhctor]p8: 2817 // Each expression in the expression-list is of the form 2818 // static_cast<T&&>(p), where p is the name of the corresponding 2819 // constructor parameter and T is the declared type of p. 2820 SmallVector<Expr*, 16> Args; 2821 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2822 ParmVarDecl *PD = Constructor->getParamDecl(I); 2823 ExprResult ArgExpr = 2824 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2825 VK_LValue, SourceLocation()); 2826 if (ArgExpr.isInvalid()) 2827 return true; 2828 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2829 } 2830 2831 InitializationKind InitKind = InitializationKind::CreateDirect( 2832 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2833 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, Args); 2834 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2835 break; 2836 } 2837 } 2838 // Fall through. 2839 case IIK_Default: { 2840 InitializationKind InitKind 2841 = InitializationKind::CreateDefault(Constructor->getLocation()); 2842 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 2843 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 2844 break; 2845 } 2846 2847 case IIK_Move: 2848 case IIK_Copy: { 2849 bool Moving = ImplicitInitKind == IIK_Move; 2850 ParmVarDecl *Param = Constructor->getParamDecl(0); 2851 QualType ParamType = Param->getType().getNonReferenceType(); 2852 2853 Expr *CopyCtorArg = 2854 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2855 SourceLocation(), Param, false, 2856 Constructor->getLocation(), ParamType, 2857 VK_LValue, 0); 2858 2859 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2860 2861 // Cast to the base class to avoid ambiguities. 2862 QualType ArgTy = 2863 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2864 ParamType.getQualifiers()); 2865 2866 if (Moving) { 2867 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2868 } 2869 2870 CXXCastPath BasePath; 2871 BasePath.push_back(BaseSpec); 2872 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2873 CK_UncheckedDerivedToBase, 2874 Moving ? VK_XValue : VK_LValue, 2875 &BasePath).take(); 2876 2877 InitializationKind InitKind 2878 = InitializationKind::CreateDirect(Constructor->getLocation(), 2879 SourceLocation(), SourceLocation()); 2880 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, CopyCtorArg); 2881 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, CopyCtorArg); 2882 break; 2883 } 2884 } 2885 2886 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2887 if (BaseInit.isInvalid()) 2888 return true; 2889 2890 CXXBaseInit = 2891 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2892 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2893 SourceLocation()), 2894 BaseSpec->isVirtual(), 2895 SourceLocation(), 2896 BaseInit.takeAs<Expr>(), 2897 SourceLocation(), 2898 SourceLocation()); 2899 2900 return false; 2901} 2902 2903static bool RefersToRValueRef(Expr *MemRef) { 2904 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2905 return Referenced->getType()->isRValueReferenceType(); 2906} 2907 2908static bool 2909BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2910 ImplicitInitializerKind ImplicitInitKind, 2911 FieldDecl *Field, IndirectFieldDecl *Indirect, 2912 CXXCtorInitializer *&CXXMemberInit) { 2913 if (Field->isInvalidDecl()) 2914 return true; 2915 2916 SourceLocation Loc = Constructor->getLocation(); 2917 2918 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2919 bool Moving = ImplicitInitKind == IIK_Move; 2920 ParmVarDecl *Param = Constructor->getParamDecl(0); 2921 QualType ParamType = Param->getType().getNonReferenceType(); 2922 2923 // Suppress copying zero-width bitfields. 2924 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2925 return false; 2926 2927 Expr *MemberExprBase = 2928 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2929 SourceLocation(), Param, false, 2930 Loc, ParamType, VK_LValue, 0); 2931 2932 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2933 2934 if (Moving) { 2935 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2936 } 2937 2938 // Build a reference to this field within the parameter. 2939 CXXScopeSpec SS; 2940 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2941 Sema::LookupMemberName); 2942 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2943 : cast<ValueDecl>(Field), AS_public); 2944 MemberLookup.resolveKind(); 2945 ExprResult CtorArg 2946 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2947 ParamType, Loc, 2948 /*IsArrow=*/false, 2949 SS, 2950 /*TemplateKWLoc=*/SourceLocation(), 2951 /*FirstQualifierInScope=*/0, 2952 MemberLookup, 2953 /*TemplateArgs=*/0); 2954 if (CtorArg.isInvalid()) 2955 return true; 2956 2957 // C++11 [class.copy]p15: 2958 // - if a member m has rvalue reference type T&&, it is direct-initialized 2959 // with static_cast<T&&>(x.m); 2960 if (RefersToRValueRef(CtorArg.get())) { 2961 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2962 } 2963 2964 // When the field we are copying is an array, create index variables for 2965 // each dimension of the array. We use these index variables to subscript 2966 // the source array, and other clients (e.g., CodeGen) will perform the 2967 // necessary iteration with these index variables. 2968 SmallVector<VarDecl *, 4> IndexVariables; 2969 QualType BaseType = Field->getType(); 2970 QualType SizeType = SemaRef.Context.getSizeType(); 2971 bool InitializingArray = false; 2972 while (const ConstantArrayType *Array 2973 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2974 InitializingArray = true; 2975 // Create the iteration variable for this array index. 2976 IdentifierInfo *IterationVarName = 0; 2977 { 2978 SmallString<8> Str; 2979 llvm::raw_svector_ostream OS(Str); 2980 OS << "__i" << IndexVariables.size(); 2981 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2982 } 2983 VarDecl *IterationVar 2984 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2985 IterationVarName, SizeType, 2986 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2987 SC_None); 2988 IndexVariables.push_back(IterationVar); 2989 2990 // Create a reference to the iteration variable. 2991 ExprResult IterationVarRef 2992 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2993 assert(!IterationVarRef.isInvalid() && 2994 "Reference to invented variable cannot fail!"); 2995 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2996 assert(!IterationVarRef.isInvalid() && 2997 "Conversion of invented variable cannot fail!"); 2998 2999 // Subscript the array with this iteration variable. 3000 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 3001 IterationVarRef.take(), 3002 Loc); 3003 if (CtorArg.isInvalid()) 3004 return true; 3005 3006 BaseType = Array->getElementType(); 3007 } 3008 3009 // The array subscript expression is an lvalue, which is wrong for moving. 3010 if (Moving && InitializingArray) 3011 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 3012 3013 // Construct the entity that we will be initializing. For an array, this 3014 // will be first element in the array, which may require several levels 3015 // of array-subscript entities. 3016 SmallVector<InitializedEntity, 4> Entities; 3017 Entities.reserve(1 + IndexVariables.size()); 3018 if (Indirect) 3019 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 3020 else 3021 Entities.push_back(InitializedEntity::InitializeMember(Field)); 3022 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 3023 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 3024 0, 3025 Entities.back())); 3026 3027 // Direct-initialize to use the copy constructor. 3028 InitializationKind InitKind = 3029 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 3030 3031 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 3032 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, CtorArgE); 3033 3034 ExprResult MemberInit 3035 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 3036 MultiExprArg(&CtorArgE, 1)); 3037 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3038 if (MemberInit.isInvalid()) 3039 return true; 3040 3041 if (Indirect) { 3042 assert(IndexVariables.size() == 0 && 3043 "Indirect field improperly initialized"); 3044 CXXMemberInit 3045 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3046 Loc, Loc, 3047 MemberInit.takeAs<Expr>(), 3048 Loc); 3049 } else 3050 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 3051 Loc, MemberInit.takeAs<Expr>(), 3052 Loc, 3053 IndexVariables.data(), 3054 IndexVariables.size()); 3055 return false; 3056 } 3057 3058 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 3059 "Unhandled implicit init kind!"); 3060 3061 QualType FieldBaseElementType = 3062 SemaRef.Context.getBaseElementType(Field->getType()); 3063 3064 if (FieldBaseElementType->isRecordType()) { 3065 InitializedEntity InitEntity 3066 = Indirect? InitializedEntity::InitializeMember(Indirect) 3067 : InitializedEntity::InitializeMember(Field); 3068 InitializationKind InitKind = 3069 InitializationKind::CreateDefault(Loc); 3070 3071 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, None); 3072 ExprResult MemberInit = 3073 InitSeq.Perform(SemaRef, InitEntity, InitKind, None); 3074 3075 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 3076 if (MemberInit.isInvalid()) 3077 return true; 3078 3079 if (Indirect) 3080 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3081 Indirect, Loc, 3082 Loc, 3083 MemberInit.get(), 3084 Loc); 3085 else 3086 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 3087 Field, Loc, Loc, 3088 MemberInit.get(), 3089 Loc); 3090 return false; 3091 } 3092 3093 if (!Field->getParent()->isUnion()) { 3094 if (FieldBaseElementType->isReferenceType()) { 3095 SemaRef.Diag(Constructor->getLocation(), 3096 diag::err_uninitialized_member_in_ctor) 3097 << (int)Constructor->isImplicit() 3098 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3099 << 0 << Field->getDeclName(); 3100 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3101 return true; 3102 } 3103 3104 if (FieldBaseElementType.isConstQualified()) { 3105 SemaRef.Diag(Constructor->getLocation(), 3106 diag::err_uninitialized_member_in_ctor) 3107 << (int)Constructor->isImplicit() 3108 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 3109 << 1 << Field->getDeclName(); 3110 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 3111 return true; 3112 } 3113 } 3114 3115 if (SemaRef.getLangOpts().ObjCAutoRefCount && 3116 FieldBaseElementType->isObjCRetainableType() && 3117 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3118 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3119 // ARC: 3120 // Default-initialize Objective-C pointers to NULL. 3121 CXXMemberInit 3122 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3123 Loc, Loc, 3124 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3125 Loc); 3126 return false; 3127 } 3128 3129 // Nothing to initialize. 3130 CXXMemberInit = 0; 3131 return false; 3132} 3133 3134namespace { 3135struct BaseAndFieldInfo { 3136 Sema &S; 3137 CXXConstructorDecl *Ctor; 3138 bool AnyErrorsInInits; 3139 ImplicitInitializerKind IIK; 3140 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3141 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3142 3143 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3144 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3145 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3146 if (Generated && Ctor->isCopyConstructor()) 3147 IIK = IIK_Copy; 3148 else if (Generated && Ctor->isMoveConstructor()) 3149 IIK = IIK_Move; 3150 else if (Ctor->getInheritedConstructor()) 3151 IIK = IIK_Inherit; 3152 else 3153 IIK = IIK_Default; 3154 } 3155 3156 bool isImplicitCopyOrMove() const { 3157 switch (IIK) { 3158 case IIK_Copy: 3159 case IIK_Move: 3160 return true; 3161 3162 case IIK_Default: 3163 case IIK_Inherit: 3164 return false; 3165 } 3166 3167 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3168 } 3169 3170 bool addFieldInitializer(CXXCtorInitializer *Init) { 3171 AllToInit.push_back(Init); 3172 3173 // Check whether this initializer makes the field "used". 3174 if (Init->getInit()->HasSideEffects(S.Context)) 3175 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3176 3177 return false; 3178 } 3179}; 3180} 3181 3182/// \brief Determine whether the given indirect field declaration is somewhere 3183/// within an anonymous union. 3184static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3185 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3186 CEnd = F->chain_end(); 3187 C != CEnd; ++C) 3188 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3189 if (Record->isUnion()) 3190 return true; 3191 3192 return false; 3193} 3194 3195/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3196/// array type. 3197static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3198 if (T->isIncompleteArrayType()) 3199 return true; 3200 3201 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3202 if (!ArrayT->getSize()) 3203 return true; 3204 3205 T = ArrayT->getElementType(); 3206 } 3207 3208 return false; 3209} 3210 3211static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3212 FieldDecl *Field, 3213 IndirectFieldDecl *Indirect = 0) { 3214 3215 // Overwhelmingly common case: we have a direct initializer for this field. 3216 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3217 return Info.addFieldInitializer(Init); 3218 3219 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3220 // has a brace-or-equal-initializer, the entity is initialized as specified 3221 // in [dcl.init]. 3222 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3223 Expr *DIE = CXXDefaultInitExpr::Create(SemaRef.Context, 3224 Info.Ctor->getLocation(), Field); 3225 CXXCtorInitializer *Init; 3226 if (Indirect) 3227 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3228 SourceLocation(), 3229 SourceLocation(), DIE, 3230 SourceLocation()); 3231 else 3232 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3233 SourceLocation(), 3234 SourceLocation(), DIE, 3235 SourceLocation()); 3236 return Info.addFieldInitializer(Init); 3237 } 3238 3239 // Don't build an implicit initializer for union members if none was 3240 // explicitly specified. 3241 if (Field->getParent()->isUnion() || 3242 (Indirect && isWithinAnonymousUnion(Indirect))) 3243 return false; 3244 3245 // Don't initialize incomplete or zero-length arrays. 3246 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3247 return false; 3248 3249 // Don't try to build an implicit initializer if there were semantic 3250 // errors in any of the initializers (and therefore we might be 3251 // missing some that the user actually wrote). 3252 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3253 return false; 3254 3255 CXXCtorInitializer *Init = 0; 3256 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3257 Indirect, Init)) 3258 return true; 3259 3260 if (!Init) 3261 return false; 3262 3263 return Info.addFieldInitializer(Init); 3264} 3265 3266bool 3267Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3268 CXXCtorInitializer *Initializer) { 3269 assert(Initializer->isDelegatingInitializer()); 3270 Constructor->setNumCtorInitializers(1); 3271 CXXCtorInitializer **initializer = 3272 new (Context) CXXCtorInitializer*[1]; 3273 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3274 Constructor->setCtorInitializers(initializer); 3275 3276 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3277 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3278 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3279 } 3280 3281 DelegatingCtorDecls.push_back(Constructor); 3282 3283 return false; 3284} 3285 3286bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3287 ArrayRef<CXXCtorInitializer *> Initializers) { 3288 if (Constructor->isDependentContext()) { 3289 // Just store the initializers as written, they will be checked during 3290 // instantiation. 3291 if (!Initializers.empty()) { 3292 Constructor->setNumCtorInitializers(Initializers.size()); 3293 CXXCtorInitializer **baseOrMemberInitializers = 3294 new (Context) CXXCtorInitializer*[Initializers.size()]; 3295 memcpy(baseOrMemberInitializers, Initializers.data(), 3296 Initializers.size() * sizeof(CXXCtorInitializer*)); 3297 Constructor->setCtorInitializers(baseOrMemberInitializers); 3298 } 3299 3300 // Let template instantiation know whether we had errors. 3301 if (AnyErrors) 3302 Constructor->setInvalidDecl(); 3303 3304 return false; 3305 } 3306 3307 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3308 3309 // We need to build the initializer AST according to order of construction 3310 // and not what user specified in the Initializers list. 3311 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3312 if (!ClassDecl) 3313 return true; 3314 3315 bool HadError = false; 3316 3317 for (unsigned i = 0; i < Initializers.size(); i++) { 3318 CXXCtorInitializer *Member = Initializers[i]; 3319 3320 if (Member->isBaseInitializer()) 3321 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3322 else 3323 Info.AllBaseFields[Member->getAnyMember()] = Member; 3324 } 3325 3326 // Keep track of the direct virtual bases. 3327 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3328 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3329 E = ClassDecl->bases_end(); I != E; ++I) { 3330 if (I->isVirtual()) 3331 DirectVBases.insert(I); 3332 } 3333 3334 // Push virtual bases before others. 3335 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3336 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3337 3338 if (CXXCtorInitializer *Value 3339 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3340 Info.AllToInit.push_back(Value); 3341 } else if (!AnyErrors) { 3342 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3343 CXXCtorInitializer *CXXBaseInit; 3344 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3345 VBase, IsInheritedVirtualBase, 3346 CXXBaseInit)) { 3347 HadError = true; 3348 continue; 3349 } 3350 3351 Info.AllToInit.push_back(CXXBaseInit); 3352 } 3353 } 3354 3355 // Non-virtual bases. 3356 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3357 E = ClassDecl->bases_end(); Base != E; ++Base) { 3358 // Virtuals are in the virtual base list and already constructed. 3359 if (Base->isVirtual()) 3360 continue; 3361 3362 if (CXXCtorInitializer *Value 3363 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3364 Info.AllToInit.push_back(Value); 3365 } else if (!AnyErrors) { 3366 CXXCtorInitializer *CXXBaseInit; 3367 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3368 Base, /*IsInheritedVirtualBase=*/false, 3369 CXXBaseInit)) { 3370 HadError = true; 3371 continue; 3372 } 3373 3374 Info.AllToInit.push_back(CXXBaseInit); 3375 } 3376 } 3377 3378 // Fields. 3379 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3380 MemEnd = ClassDecl->decls_end(); 3381 Mem != MemEnd; ++Mem) { 3382 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3383 // C++ [class.bit]p2: 3384 // A declaration for a bit-field that omits the identifier declares an 3385 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3386 // initialized. 3387 if (F->isUnnamedBitfield()) 3388 continue; 3389 3390 // If we're not generating the implicit copy/move constructor, then we'll 3391 // handle anonymous struct/union fields based on their individual 3392 // indirect fields. 3393 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3394 continue; 3395 3396 if (CollectFieldInitializer(*this, Info, F)) 3397 HadError = true; 3398 continue; 3399 } 3400 3401 // Beyond this point, we only consider default initialization. 3402 if (Info.isImplicitCopyOrMove()) 3403 continue; 3404 3405 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3406 if (F->getType()->isIncompleteArrayType()) { 3407 assert(ClassDecl->hasFlexibleArrayMember() && 3408 "Incomplete array type is not valid"); 3409 continue; 3410 } 3411 3412 // Initialize each field of an anonymous struct individually. 3413 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3414 HadError = true; 3415 3416 continue; 3417 } 3418 } 3419 3420 unsigned NumInitializers = Info.AllToInit.size(); 3421 if (NumInitializers > 0) { 3422 Constructor->setNumCtorInitializers(NumInitializers); 3423 CXXCtorInitializer **baseOrMemberInitializers = 3424 new (Context) CXXCtorInitializer*[NumInitializers]; 3425 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3426 NumInitializers * sizeof(CXXCtorInitializer*)); 3427 Constructor->setCtorInitializers(baseOrMemberInitializers); 3428 3429 // Constructors implicitly reference the base and member 3430 // destructors. 3431 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3432 Constructor->getParent()); 3433 } 3434 3435 return HadError; 3436} 3437 3438static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3439 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3440 const RecordDecl *RD = RT->getDecl(); 3441 if (RD->isAnonymousStructOrUnion()) { 3442 for (RecordDecl::field_iterator Field = RD->field_begin(), 3443 E = RD->field_end(); Field != E; ++Field) 3444 PopulateKeysForFields(*Field, IdealInits); 3445 return; 3446 } 3447 } 3448 IdealInits.push_back(Field); 3449} 3450 3451static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3452 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3453} 3454 3455static void *GetKeyForMember(ASTContext &Context, 3456 CXXCtorInitializer *Member) { 3457 if (!Member->isAnyMemberInitializer()) 3458 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3459 3460 return Member->getAnyMember(); 3461} 3462 3463static void DiagnoseBaseOrMemInitializerOrder( 3464 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3465 ArrayRef<CXXCtorInitializer *> Inits) { 3466 if (Constructor->getDeclContext()->isDependentContext()) 3467 return; 3468 3469 // Don't check initializers order unless the warning is enabled at the 3470 // location of at least one initializer. 3471 bool ShouldCheckOrder = false; 3472 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3473 CXXCtorInitializer *Init = Inits[InitIndex]; 3474 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3475 Init->getSourceLocation()) 3476 != DiagnosticsEngine::Ignored) { 3477 ShouldCheckOrder = true; 3478 break; 3479 } 3480 } 3481 if (!ShouldCheckOrder) 3482 return; 3483 3484 // Build the list of bases and members in the order that they'll 3485 // actually be initialized. The explicit initializers should be in 3486 // this same order but may be missing things. 3487 SmallVector<const void*, 32> IdealInitKeys; 3488 3489 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3490 3491 // 1. Virtual bases. 3492 for (CXXRecordDecl::base_class_const_iterator VBase = 3493 ClassDecl->vbases_begin(), 3494 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3495 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3496 3497 // 2. Non-virtual bases. 3498 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3499 E = ClassDecl->bases_end(); Base != E; ++Base) { 3500 if (Base->isVirtual()) 3501 continue; 3502 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3503 } 3504 3505 // 3. Direct fields. 3506 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3507 E = ClassDecl->field_end(); Field != E; ++Field) { 3508 if (Field->isUnnamedBitfield()) 3509 continue; 3510 3511 PopulateKeysForFields(*Field, IdealInitKeys); 3512 } 3513 3514 unsigned NumIdealInits = IdealInitKeys.size(); 3515 unsigned IdealIndex = 0; 3516 3517 CXXCtorInitializer *PrevInit = 0; 3518 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3519 CXXCtorInitializer *Init = Inits[InitIndex]; 3520 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3521 3522 // Scan forward to try to find this initializer in the idealized 3523 // initializers list. 3524 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3525 if (InitKey == IdealInitKeys[IdealIndex]) 3526 break; 3527 3528 // If we didn't find this initializer, it must be because we 3529 // scanned past it on a previous iteration. That can only 3530 // happen if we're out of order; emit a warning. 3531 if (IdealIndex == NumIdealInits && PrevInit) { 3532 Sema::SemaDiagnosticBuilder D = 3533 SemaRef.Diag(PrevInit->getSourceLocation(), 3534 diag::warn_initializer_out_of_order); 3535 3536 if (PrevInit->isAnyMemberInitializer()) 3537 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3538 else 3539 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3540 3541 if (Init->isAnyMemberInitializer()) 3542 D << 0 << Init->getAnyMember()->getDeclName(); 3543 else 3544 D << 1 << Init->getTypeSourceInfo()->getType(); 3545 3546 // Move back to the initializer's location in the ideal list. 3547 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3548 if (InitKey == IdealInitKeys[IdealIndex]) 3549 break; 3550 3551 assert(IdealIndex != NumIdealInits && 3552 "initializer not found in initializer list"); 3553 } 3554 3555 PrevInit = Init; 3556 } 3557} 3558 3559namespace { 3560bool CheckRedundantInit(Sema &S, 3561 CXXCtorInitializer *Init, 3562 CXXCtorInitializer *&PrevInit) { 3563 if (!PrevInit) { 3564 PrevInit = Init; 3565 return false; 3566 } 3567 3568 if (FieldDecl *Field = Init->getAnyMember()) 3569 S.Diag(Init->getSourceLocation(), 3570 diag::err_multiple_mem_initialization) 3571 << Field->getDeclName() 3572 << Init->getSourceRange(); 3573 else { 3574 const Type *BaseClass = Init->getBaseClass(); 3575 assert(BaseClass && "neither field nor base"); 3576 S.Diag(Init->getSourceLocation(), 3577 diag::err_multiple_base_initialization) 3578 << QualType(BaseClass, 0) 3579 << Init->getSourceRange(); 3580 } 3581 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3582 << 0 << PrevInit->getSourceRange(); 3583 3584 return true; 3585} 3586 3587typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3588typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3589 3590bool CheckRedundantUnionInit(Sema &S, 3591 CXXCtorInitializer *Init, 3592 RedundantUnionMap &Unions) { 3593 FieldDecl *Field = Init->getAnyMember(); 3594 RecordDecl *Parent = Field->getParent(); 3595 NamedDecl *Child = Field; 3596 3597 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3598 if (Parent->isUnion()) { 3599 UnionEntry &En = Unions[Parent]; 3600 if (En.first && En.first != Child) { 3601 S.Diag(Init->getSourceLocation(), 3602 diag::err_multiple_mem_union_initialization) 3603 << Field->getDeclName() 3604 << Init->getSourceRange(); 3605 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3606 << 0 << En.second->getSourceRange(); 3607 return true; 3608 } 3609 if (!En.first) { 3610 En.first = Child; 3611 En.second = Init; 3612 } 3613 if (!Parent->isAnonymousStructOrUnion()) 3614 return false; 3615 } 3616 3617 Child = Parent; 3618 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3619 } 3620 3621 return false; 3622} 3623} 3624 3625/// ActOnMemInitializers - Handle the member initializers for a constructor. 3626void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3627 SourceLocation ColonLoc, 3628 ArrayRef<CXXCtorInitializer*> MemInits, 3629 bool AnyErrors) { 3630 if (!ConstructorDecl) 3631 return; 3632 3633 AdjustDeclIfTemplate(ConstructorDecl); 3634 3635 CXXConstructorDecl *Constructor 3636 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3637 3638 if (!Constructor) { 3639 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3640 return; 3641 } 3642 3643 // Mapping for the duplicate initializers check. 3644 // For member initializers, this is keyed with a FieldDecl*. 3645 // For base initializers, this is keyed with a Type*. 3646 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3647 3648 // Mapping for the inconsistent anonymous-union initializers check. 3649 RedundantUnionMap MemberUnions; 3650 3651 bool HadError = false; 3652 for (unsigned i = 0; i < MemInits.size(); i++) { 3653 CXXCtorInitializer *Init = MemInits[i]; 3654 3655 // Set the source order index. 3656 Init->setSourceOrder(i); 3657 3658 if (Init->isAnyMemberInitializer()) { 3659 FieldDecl *Field = Init->getAnyMember(); 3660 if (CheckRedundantInit(*this, Init, Members[Field]) || 3661 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3662 HadError = true; 3663 } else if (Init->isBaseInitializer()) { 3664 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3665 if (CheckRedundantInit(*this, Init, Members[Key])) 3666 HadError = true; 3667 } else { 3668 assert(Init->isDelegatingInitializer()); 3669 // This must be the only initializer 3670 if (MemInits.size() != 1) { 3671 Diag(Init->getSourceLocation(), 3672 diag::err_delegating_initializer_alone) 3673 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3674 // We will treat this as being the only initializer. 3675 } 3676 SetDelegatingInitializer(Constructor, MemInits[i]); 3677 // Return immediately as the initializer is set. 3678 return; 3679 } 3680 } 3681 3682 if (HadError) 3683 return; 3684 3685 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3686 3687 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3688} 3689 3690void 3691Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3692 CXXRecordDecl *ClassDecl) { 3693 // Ignore dependent contexts. Also ignore unions, since their members never 3694 // have destructors implicitly called. 3695 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3696 return; 3697 3698 // FIXME: all the access-control diagnostics are positioned on the 3699 // field/base declaration. That's probably good; that said, the 3700 // user might reasonably want to know why the destructor is being 3701 // emitted, and we currently don't say. 3702 3703 // Non-static data members. 3704 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3705 E = ClassDecl->field_end(); I != E; ++I) { 3706 FieldDecl *Field = *I; 3707 if (Field->isInvalidDecl()) 3708 continue; 3709 3710 // Don't destroy incomplete or zero-length arrays. 3711 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3712 continue; 3713 3714 QualType FieldType = Context.getBaseElementType(Field->getType()); 3715 3716 const RecordType* RT = FieldType->getAs<RecordType>(); 3717 if (!RT) 3718 continue; 3719 3720 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3721 if (FieldClassDecl->isInvalidDecl()) 3722 continue; 3723 if (FieldClassDecl->hasIrrelevantDestructor()) 3724 continue; 3725 // The destructor for an implicit anonymous union member is never invoked. 3726 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3727 continue; 3728 3729 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3730 assert(Dtor && "No dtor found for FieldClassDecl!"); 3731 CheckDestructorAccess(Field->getLocation(), Dtor, 3732 PDiag(diag::err_access_dtor_field) 3733 << Field->getDeclName() 3734 << FieldType); 3735 3736 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3737 DiagnoseUseOfDecl(Dtor, Location); 3738 } 3739 3740 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3741 3742 // Bases. 3743 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3744 E = ClassDecl->bases_end(); Base != E; ++Base) { 3745 // Bases are always records in a well-formed non-dependent class. 3746 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3747 3748 // Remember direct virtual bases. 3749 if (Base->isVirtual()) 3750 DirectVirtualBases.insert(RT); 3751 3752 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3753 // If our base class is invalid, we probably can't get its dtor anyway. 3754 if (BaseClassDecl->isInvalidDecl()) 3755 continue; 3756 if (BaseClassDecl->hasIrrelevantDestructor()) 3757 continue; 3758 3759 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3760 assert(Dtor && "No dtor found for BaseClassDecl!"); 3761 3762 // FIXME: caret should be on the start of the class name 3763 CheckDestructorAccess(Base->getLocStart(), Dtor, 3764 PDiag(diag::err_access_dtor_base) 3765 << Base->getType() 3766 << Base->getSourceRange(), 3767 Context.getTypeDeclType(ClassDecl)); 3768 3769 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3770 DiagnoseUseOfDecl(Dtor, Location); 3771 } 3772 3773 // Virtual bases. 3774 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3775 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3776 3777 // Bases are always records in a well-formed non-dependent class. 3778 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3779 3780 // Ignore direct virtual bases. 3781 if (DirectVirtualBases.count(RT)) 3782 continue; 3783 3784 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3785 // If our base class is invalid, we probably can't get its dtor anyway. 3786 if (BaseClassDecl->isInvalidDecl()) 3787 continue; 3788 if (BaseClassDecl->hasIrrelevantDestructor()) 3789 continue; 3790 3791 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3792 assert(Dtor && "No dtor found for BaseClassDecl!"); 3793 if (CheckDestructorAccess( 3794 ClassDecl->getLocation(), Dtor, 3795 PDiag(diag::err_access_dtor_vbase) 3796 << Context.getTypeDeclType(ClassDecl) << VBase->getType(), 3797 Context.getTypeDeclType(ClassDecl)) == 3798 AR_accessible) { 3799 CheckDerivedToBaseConversion( 3800 Context.getTypeDeclType(ClassDecl), VBase->getType(), 3801 diag::err_access_dtor_vbase, 0, ClassDecl->getLocation(), 3802 SourceRange(), DeclarationName(), 0); 3803 } 3804 3805 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3806 DiagnoseUseOfDecl(Dtor, Location); 3807 } 3808} 3809 3810void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3811 if (!CDtorDecl) 3812 return; 3813 3814 if (CXXConstructorDecl *Constructor 3815 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3816 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3817} 3818 3819bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3820 unsigned DiagID, AbstractDiagSelID SelID) { 3821 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3822 unsigned DiagID; 3823 AbstractDiagSelID SelID; 3824 3825 public: 3826 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3827 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3828 3829 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3830 if (Suppressed) return; 3831 if (SelID == -1) 3832 S.Diag(Loc, DiagID) << T; 3833 else 3834 S.Diag(Loc, DiagID) << SelID << T; 3835 } 3836 } Diagnoser(DiagID, SelID); 3837 3838 return RequireNonAbstractType(Loc, T, Diagnoser); 3839} 3840 3841bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3842 TypeDiagnoser &Diagnoser) { 3843 if (!getLangOpts().CPlusPlus) 3844 return false; 3845 3846 if (const ArrayType *AT = Context.getAsArrayType(T)) 3847 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3848 3849 if (const PointerType *PT = T->getAs<PointerType>()) { 3850 // Find the innermost pointer type. 3851 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3852 PT = T; 3853 3854 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3855 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3856 } 3857 3858 const RecordType *RT = T->getAs<RecordType>(); 3859 if (!RT) 3860 return false; 3861 3862 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3863 3864 // We can't answer whether something is abstract until it has a 3865 // definition. If it's currently being defined, we'll walk back 3866 // over all the declarations when we have a full definition. 3867 const CXXRecordDecl *Def = RD->getDefinition(); 3868 if (!Def || Def->isBeingDefined()) 3869 return false; 3870 3871 if (!RD->isAbstract()) 3872 return false; 3873 3874 Diagnoser.diagnose(*this, Loc, T); 3875 DiagnoseAbstractType(RD); 3876 3877 return true; 3878} 3879 3880void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3881 // Check if we've already emitted the list of pure virtual functions 3882 // for this class. 3883 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3884 return; 3885 3886 CXXFinalOverriderMap FinalOverriders; 3887 RD->getFinalOverriders(FinalOverriders); 3888 3889 // Keep a set of seen pure methods so we won't diagnose the same method 3890 // more than once. 3891 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3892 3893 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3894 MEnd = FinalOverriders.end(); 3895 M != MEnd; 3896 ++M) { 3897 for (OverridingMethods::iterator SO = M->second.begin(), 3898 SOEnd = M->second.end(); 3899 SO != SOEnd; ++SO) { 3900 // C++ [class.abstract]p4: 3901 // A class is abstract if it contains or inherits at least one 3902 // pure virtual function for which the final overrider is pure 3903 // virtual. 3904 3905 // 3906 if (SO->second.size() != 1) 3907 continue; 3908 3909 if (!SO->second.front().Method->isPure()) 3910 continue; 3911 3912 if (!SeenPureMethods.insert(SO->second.front().Method)) 3913 continue; 3914 3915 Diag(SO->second.front().Method->getLocation(), 3916 diag::note_pure_virtual_function) 3917 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3918 } 3919 } 3920 3921 if (!PureVirtualClassDiagSet) 3922 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3923 PureVirtualClassDiagSet->insert(RD); 3924} 3925 3926namespace { 3927struct AbstractUsageInfo { 3928 Sema &S; 3929 CXXRecordDecl *Record; 3930 CanQualType AbstractType; 3931 bool Invalid; 3932 3933 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3934 : S(S), Record(Record), 3935 AbstractType(S.Context.getCanonicalType( 3936 S.Context.getTypeDeclType(Record))), 3937 Invalid(false) {} 3938 3939 void DiagnoseAbstractType() { 3940 if (Invalid) return; 3941 S.DiagnoseAbstractType(Record); 3942 Invalid = true; 3943 } 3944 3945 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3946}; 3947 3948struct CheckAbstractUsage { 3949 AbstractUsageInfo &Info; 3950 const NamedDecl *Ctx; 3951 3952 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3953 : Info(Info), Ctx(Ctx) {} 3954 3955 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3956 switch (TL.getTypeLocClass()) { 3957#define ABSTRACT_TYPELOC(CLASS, PARENT) 3958#define TYPELOC(CLASS, PARENT) \ 3959 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3960#include "clang/AST/TypeLocNodes.def" 3961 } 3962 } 3963 3964 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3965 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3966 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3967 if (!TL.getArg(I)) 3968 continue; 3969 3970 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3971 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3972 } 3973 } 3974 3975 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3976 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3977 } 3978 3979 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3980 // Visit the type parameters from a permissive context. 3981 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3982 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3983 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3984 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3985 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3986 // TODO: other template argument types? 3987 } 3988 } 3989 3990 // Visit pointee types from a permissive context. 3991#define CheckPolymorphic(Type) \ 3992 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3993 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3994 } 3995 CheckPolymorphic(PointerTypeLoc) 3996 CheckPolymorphic(ReferenceTypeLoc) 3997 CheckPolymorphic(MemberPointerTypeLoc) 3998 CheckPolymorphic(BlockPointerTypeLoc) 3999 CheckPolymorphic(AtomicTypeLoc) 4000 4001 /// Handle all the types we haven't given a more specific 4002 /// implementation for above. 4003 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 4004 // Every other kind of type that we haven't called out already 4005 // that has an inner type is either (1) sugar or (2) contains that 4006 // inner type in some way as a subobject. 4007 if (TypeLoc Next = TL.getNextTypeLoc()) 4008 return Visit(Next, Sel); 4009 4010 // If there's no inner type and we're in a permissive context, 4011 // don't diagnose. 4012 if (Sel == Sema::AbstractNone) return; 4013 4014 // Check whether the type matches the abstract type. 4015 QualType T = TL.getType(); 4016 if (T->isArrayType()) { 4017 Sel = Sema::AbstractArrayType; 4018 T = Info.S.Context.getBaseElementType(T); 4019 } 4020 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 4021 if (CT != Info.AbstractType) return; 4022 4023 // It matched; do some magic. 4024 if (Sel == Sema::AbstractArrayType) { 4025 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 4026 << T << TL.getSourceRange(); 4027 } else { 4028 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 4029 << Sel << T << TL.getSourceRange(); 4030 } 4031 Info.DiagnoseAbstractType(); 4032 } 4033}; 4034 4035void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 4036 Sema::AbstractDiagSelID Sel) { 4037 CheckAbstractUsage(*this, D).Visit(TL, Sel); 4038} 4039 4040} 4041 4042/// Check for invalid uses of an abstract type in a method declaration. 4043static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4044 CXXMethodDecl *MD) { 4045 // No need to do the check on definitions, which require that 4046 // the return/param types be complete. 4047 if (MD->doesThisDeclarationHaveABody()) 4048 return; 4049 4050 // For safety's sake, just ignore it if we don't have type source 4051 // information. This should never happen for non-implicit methods, 4052 // but... 4053 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 4054 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 4055} 4056 4057/// Check for invalid uses of an abstract type within a class definition. 4058static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 4059 CXXRecordDecl *RD) { 4060 for (CXXRecordDecl::decl_iterator 4061 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 4062 Decl *D = *I; 4063 if (D->isImplicit()) continue; 4064 4065 // Methods and method templates. 4066 if (isa<CXXMethodDecl>(D)) { 4067 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 4068 } else if (isa<FunctionTemplateDecl>(D)) { 4069 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 4070 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 4071 4072 // Fields and static variables. 4073 } else if (isa<FieldDecl>(D)) { 4074 FieldDecl *FD = cast<FieldDecl>(D); 4075 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 4076 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 4077 } else if (isa<VarDecl>(D)) { 4078 VarDecl *VD = cast<VarDecl>(D); 4079 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 4080 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 4081 4082 // Nested classes and class templates. 4083 } else if (isa<CXXRecordDecl>(D)) { 4084 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 4085 } else if (isa<ClassTemplateDecl>(D)) { 4086 CheckAbstractClassUsage(Info, 4087 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 4088 } 4089 } 4090} 4091 4092/// \brief Perform semantic checks on a class definition that has been 4093/// completing, introducing implicitly-declared members, checking for 4094/// abstract types, etc. 4095void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 4096 if (!Record) 4097 return; 4098 4099 if (Record->isAbstract() && !Record->isInvalidDecl()) { 4100 AbstractUsageInfo Info(*this, Record); 4101 CheckAbstractClassUsage(Info, Record); 4102 } 4103 4104 // If this is not an aggregate type and has no user-declared constructor, 4105 // complain about any non-static data members of reference or const scalar 4106 // type, since they will never get initializers. 4107 if (!Record->isInvalidDecl() && !Record->isDependentType() && 4108 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 4109 !Record->isLambda()) { 4110 bool Complained = false; 4111 for (RecordDecl::field_iterator F = Record->field_begin(), 4112 FEnd = Record->field_end(); 4113 F != FEnd; ++F) { 4114 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 4115 continue; 4116 4117 if (F->getType()->isReferenceType() || 4118 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 4119 if (!Complained) { 4120 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 4121 << Record->getTagKind() << Record; 4122 Complained = true; 4123 } 4124 4125 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4126 << F->getType()->isReferenceType() 4127 << F->getDeclName(); 4128 } 4129 } 4130 } 4131 4132 if (Record->isDynamicClass() && !Record->isDependentType()) 4133 DynamicClasses.push_back(Record); 4134 4135 if (Record->getIdentifier()) { 4136 // C++ [class.mem]p13: 4137 // If T is the name of a class, then each of the following shall have a 4138 // name different from T: 4139 // - every member of every anonymous union that is a member of class T. 4140 // 4141 // C++ [class.mem]p14: 4142 // In addition, if class T has a user-declared constructor (12.1), every 4143 // non-static data member of class T shall have a name different from T. 4144 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4145 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4146 ++I) { 4147 NamedDecl *D = *I; 4148 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4149 isa<IndirectFieldDecl>(D)) { 4150 Diag(D->getLocation(), diag::err_member_name_of_class) 4151 << D->getDeclName(); 4152 break; 4153 } 4154 } 4155 } 4156 4157 // Warn if the class has virtual methods but non-virtual public destructor. 4158 if (Record->isPolymorphic() && !Record->isDependentType()) { 4159 CXXDestructorDecl *dtor = Record->getDestructor(); 4160 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4161 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4162 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4163 } 4164 4165 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4166 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4167 DiagnoseAbstractType(Record); 4168 } 4169 4170 if (!Record->isDependentType()) { 4171 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4172 MEnd = Record->method_end(); 4173 M != MEnd; ++M) { 4174 // See if a method overloads virtual methods in a base 4175 // class without overriding any. 4176 if (!M->isStatic()) 4177 DiagnoseHiddenVirtualMethods(Record, *M); 4178 4179 // Check whether the explicitly-defaulted special members are valid. 4180 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4181 CheckExplicitlyDefaultedSpecialMember(*M); 4182 4183 // For an explicitly defaulted or deleted special member, we defer 4184 // determining triviality until the class is complete. That time is now! 4185 if (!M->isImplicit() && !M->isUserProvided()) { 4186 CXXSpecialMember CSM = getSpecialMember(*M); 4187 if (CSM != CXXInvalid) { 4188 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4189 4190 // Inform the class that we've finished declaring this member. 4191 Record->finishedDefaultedOrDeletedMember(*M); 4192 } 4193 } 4194 } 4195 } 4196 4197 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4198 // function that is not a constructor declares that member function to be 4199 // const. [...] The class of which that function is a member shall be 4200 // a literal type. 4201 // 4202 // If the class has virtual bases, any constexpr members will already have 4203 // been diagnosed by the checks performed on the member declaration, so 4204 // suppress this (less useful) diagnostic. 4205 // 4206 // We delay this until we know whether an explicitly-defaulted (or deleted) 4207 // destructor for the class is trivial. 4208 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4209 !Record->isLiteral() && !Record->getNumVBases()) { 4210 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4211 MEnd = Record->method_end(); 4212 M != MEnd; ++M) { 4213 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4214 switch (Record->getTemplateSpecializationKind()) { 4215 case TSK_ImplicitInstantiation: 4216 case TSK_ExplicitInstantiationDeclaration: 4217 case TSK_ExplicitInstantiationDefinition: 4218 // If a template instantiates to a non-literal type, but its members 4219 // instantiate to constexpr functions, the template is technically 4220 // ill-formed, but we allow it for sanity. 4221 continue; 4222 4223 case TSK_Undeclared: 4224 case TSK_ExplicitSpecialization: 4225 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4226 diag::err_constexpr_method_non_literal); 4227 break; 4228 } 4229 4230 // Only produce one error per class. 4231 break; 4232 } 4233 } 4234 } 4235 4236 // Declare inheriting constructors. We do this eagerly here because: 4237 // - The standard requires an eager diagnostic for conflicting inheriting 4238 // constructors from different classes. 4239 // - The lazy declaration of the other implicit constructors is so as to not 4240 // waste space and performance on classes that are not meant to be 4241 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4242 // have inheriting constructors. 4243 DeclareInheritingConstructors(Record); 4244} 4245 4246/// Is the special member function which would be selected to perform the 4247/// specified operation on the specified class type a constexpr constructor? 4248static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4249 Sema::CXXSpecialMember CSM, 4250 bool ConstArg) { 4251 Sema::SpecialMemberOverloadResult *SMOR = 4252 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4253 false, false, false, false); 4254 if (!SMOR || !SMOR->getMethod()) 4255 // A constructor we wouldn't select can't be "involved in initializing" 4256 // anything. 4257 return true; 4258 return SMOR->getMethod()->isConstexpr(); 4259} 4260 4261/// Determine whether the specified special member function would be constexpr 4262/// if it were implicitly defined. 4263static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4264 Sema::CXXSpecialMember CSM, 4265 bool ConstArg) { 4266 if (!S.getLangOpts().CPlusPlus11) 4267 return false; 4268 4269 // C++11 [dcl.constexpr]p4: 4270 // In the definition of a constexpr constructor [...] 4271 bool Ctor = true; 4272 switch (CSM) { 4273 case Sema::CXXDefaultConstructor: 4274 // Since default constructor lookup is essentially trivial (and cannot 4275 // involve, for instance, template instantiation), we compute whether a 4276 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4277 // 4278 // This is important for performance; we need to know whether the default 4279 // constructor is constexpr to determine whether the type is a literal type. 4280 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4281 4282 case Sema::CXXCopyConstructor: 4283 case Sema::CXXMoveConstructor: 4284 // For copy or move constructors, we need to perform overload resolution. 4285 break; 4286 4287 case Sema::CXXCopyAssignment: 4288 case Sema::CXXMoveAssignment: 4289 if (!S.getLangOpts().CPlusPlus1y) 4290 return false; 4291 // In C++1y, we need to perform overload resolution. 4292 Ctor = false; 4293 break; 4294 4295 case Sema::CXXDestructor: 4296 case Sema::CXXInvalid: 4297 return false; 4298 } 4299 4300 // -- if the class is a non-empty union, or for each non-empty anonymous 4301 // union member of a non-union class, exactly one non-static data member 4302 // shall be initialized; [DR1359] 4303 // 4304 // If we squint, this is guaranteed, since exactly one non-static data member 4305 // will be initialized (if the constructor isn't deleted), we just don't know 4306 // which one. 4307 if (Ctor && ClassDecl->isUnion()) 4308 return true; 4309 4310 // -- the class shall not have any virtual base classes; 4311 if (Ctor && ClassDecl->getNumVBases()) 4312 return false; 4313 4314 // C++1y [class.copy]p26: 4315 // -- [the class] is a literal type, and 4316 if (!Ctor && !ClassDecl->isLiteral()) 4317 return false; 4318 4319 // -- every constructor involved in initializing [...] base class 4320 // sub-objects shall be a constexpr constructor; 4321 // -- the assignment operator selected to copy/move each direct base 4322 // class is a constexpr function, and 4323 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4324 BEnd = ClassDecl->bases_end(); 4325 B != BEnd; ++B) { 4326 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4327 if (!BaseType) continue; 4328 4329 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4330 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4331 return false; 4332 } 4333 4334 // -- every constructor involved in initializing non-static data members 4335 // [...] shall be a constexpr constructor; 4336 // -- every non-static data member and base class sub-object shall be 4337 // initialized 4338 // -- for each non-stastic data member of X that is of class type (or array 4339 // thereof), the assignment operator selected to copy/move that member is 4340 // a constexpr function 4341 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4342 FEnd = ClassDecl->field_end(); 4343 F != FEnd; ++F) { 4344 if (F->isInvalidDecl()) 4345 continue; 4346 if (const RecordType *RecordTy = 4347 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4348 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4349 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4350 return false; 4351 } 4352 } 4353 4354 // All OK, it's constexpr! 4355 return true; 4356} 4357 4358static Sema::ImplicitExceptionSpecification 4359computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4360 switch (S.getSpecialMember(MD)) { 4361 case Sema::CXXDefaultConstructor: 4362 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4363 case Sema::CXXCopyConstructor: 4364 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4365 case Sema::CXXCopyAssignment: 4366 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4367 case Sema::CXXMoveConstructor: 4368 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4369 case Sema::CXXMoveAssignment: 4370 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4371 case Sema::CXXDestructor: 4372 return S.ComputeDefaultedDtorExceptionSpec(MD); 4373 case Sema::CXXInvalid: 4374 break; 4375 } 4376 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4377 "only special members have implicit exception specs"); 4378 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4379} 4380 4381static void 4382updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4383 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4384 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4385 ExceptSpec.getEPI(EPI); 4386 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4387 FPT->getArgTypes(), EPI)); 4388} 4389 4390void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4391 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4392 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4393 return; 4394 4395 // Evaluate the exception specification. 4396 ImplicitExceptionSpecification ExceptSpec = 4397 computeImplicitExceptionSpec(*this, Loc, MD); 4398 4399 // Update the type of the special member to use it. 4400 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4401 4402 // A user-provided destructor can be defined outside the class. When that 4403 // happens, be sure to update the exception specification on both 4404 // declarations. 4405 const FunctionProtoType *CanonicalFPT = 4406 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4407 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4408 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4409 CanonicalFPT, ExceptSpec); 4410} 4411 4412void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4413 CXXRecordDecl *RD = MD->getParent(); 4414 CXXSpecialMember CSM = getSpecialMember(MD); 4415 4416 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4417 "not an explicitly-defaulted special member"); 4418 4419 // Whether this was the first-declared instance of the constructor. 4420 // This affects whether we implicitly add an exception spec and constexpr. 4421 bool First = MD == MD->getCanonicalDecl(); 4422 4423 bool HadError = false; 4424 4425 // C++11 [dcl.fct.def.default]p1: 4426 // A function that is explicitly defaulted shall 4427 // -- be a special member function (checked elsewhere), 4428 // -- have the same type (except for ref-qualifiers, and except that a 4429 // copy operation can take a non-const reference) as an implicit 4430 // declaration, and 4431 // -- not have default arguments. 4432 unsigned ExpectedParams = 1; 4433 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4434 ExpectedParams = 0; 4435 if (MD->getNumParams() != ExpectedParams) { 4436 // This also checks for default arguments: a copy or move constructor with a 4437 // default argument is classified as a default constructor, and assignment 4438 // operations and destructors can't have default arguments. 4439 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4440 << CSM << MD->getSourceRange(); 4441 HadError = true; 4442 } else if (MD->isVariadic()) { 4443 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4444 << CSM << MD->getSourceRange(); 4445 HadError = true; 4446 } 4447 4448 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4449 4450 bool CanHaveConstParam = false; 4451 if (CSM == CXXCopyConstructor) 4452 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4453 else if (CSM == CXXCopyAssignment) 4454 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4455 4456 QualType ReturnType = Context.VoidTy; 4457 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4458 // Check for return type matching. 4459 ReturnType = Type->getResultType(); 4460 QualType ExpectedReturnType = 4461 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4462 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4463 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4464 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4465 HadError = true; 4466 } 4467 4468 // A defaulted special member cannot have cv-qualifiers. 4469 if (Type->getTypeQuals()) { 4470 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4471 << (CSM == CXXMoveAssignment) << getLangOpts().CPlusPlus1y; 4472 HadError = true; 4473 } 4474 } 4475 4476 // Check for parameter type matching. 4477 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4478 bool HasConstParam = false; 4479 if (ExpectedParams && ArgType->isReferenceType()) { 4480 // Argument must be reference to possibly-const T. 4481 QualType ReferentType = ArgType->getPointeeType(); 4482 HasConstParam = ReferentType.isConstQualified(); 4483 4484 if (ReferentType.isVolatileQualified()) { 4485 Diag(MD->getLocation(), 4486 diag::err_defaulted_special_member_volatile_param) << CSM; 4487 HadError = true; 4488 } 4489 4490 if (HasConstParam && !CanHaveConstParam) { 4491 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4492 Diag(MD->getLocation(), 4493 diag::err_defaulted_special_member_copy_const_param) 4494 << (CSM == CXXCopyAssignment); 4495 // FIXME: Explain why this special member can't be const. 4496 } else { 4497 Diag(MD->getLocation(), 4498 diag::err_defaulted_special_member_move_const_param) 4499 << (CSM == CXXMoveAssignment); 4500 } 4501 HadError = true; 4502 } 4503 } else if (ExpectedParams) { 4504 // A copy assignment operator can take its argument by value, but a 4505 // defaulted one cannot. 4506 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4507 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4508 HadError = true; 4509 } 4510 4511 // C++11 [dcl.fct.def.default]p2: 4512 // An explicitly-defaulted function may be declared constexpr only if it 4513 // would have been implicitly declared as constexpr, 4514 // Do not apply this rule to members of class templates, since core issue 1358 4515 // makes such functions always instantiate to constexpr functions. For 4516 // functions which cannot be constexpr (for non-constructors in C++11 and for 4517 // destructors in C++1y), this is checked elsewhere. 4518 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4519 HasConstParam); 4520 if ((getLangOpts().CPlusPlus1y ? !isa<CXXDestructorDecl>(MD) 4521 : isa<CXXConstructorDecl>(MD)) && 4522 MD->isConstexpr() && !Constexpr && 4523 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4524 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4525 // FIXME: Explain why the special member can't be constexpr. 4526 HadError = true; 4527 } 4528 4529 // and may have an explicit exception-specification only if it is compatible 4530 // with the exception-specification on the implicit declaration. 4531 if (Type->hasExceptionSpec()) { 4532 // Delay the check if this is the first declaration of the special member, 4533 // since we may not have parsed some necessary in-class initializers yet. 4534 if (First) { 4535 // If the exception specification needs to be instantiated, do so now, 4536 // before we clobber it with an EST_Unevaluated specification below. 4537 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4538 InstantiateExceptionSpec(MD->getLocStart(), MD); 4539 Type = MD->getType()->getAs<FunctionProtoType>(); 4540 } 4541 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4542 } else 4543 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4544 } 4545 4546 // If a function is explicitly defaulted on its first declaration, 4547 if (First) { 4548 // -- it is implicitly considered to be constexpr if the implicit 4549 // definition would be, 4550 MD->setConstexpr(Constexpr); 4551 4552 // -- it is implicitly considered to have the same exception-specification 4553 // as if it had been implicitly declared, 4554 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4555 EPI.ExceptionSpecType = EST_Unevaluated; 4556 EPI.ExceptionSpecDecl = MD; 4557 MD->setType(Context.getFunctionType(ReturnType, 4558 ArrayRef<QualType>(&ArgType, 4559 ExpectedParams), 4560 EPI)); 4561 } 4562 4563 if (ShouldDeleteSpecialMember(MD, CSM)) { 4564 if (First) { 4565 SetDeclDeleted(MD, MD->getLocation()); 4566 } else { 4567 // C++11 [dcl.fct.def.default]p4: 4568 // [For a] user-provided explicitly-defaulted function [...] if such a 4569 // function is implicitly defined as deleted, the program is ill-formed. 4570 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4571 HadError = true; 4572 } 4573 } 4574 4575 if (HadError) 4576 MD->setInvalidDecl(); 4577} 4578 4579/// Check whether the exception specification provided for an 4580/// explicitly-defaulted special member matches the exception specification 4581/// that would have been generated for an implicit special member, per 4582/// C++11 [dcl.fct.def.default]p2. 4583void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4584 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4585 // Compute the implicit exception specification. 4586 FunctionProtoType::ExtProtoInfo EPI; 4587 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4588 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4589 Context.getFunctionType(Context.VoidTy, None, EPI)); 4590 4591 // Ensure that it matches. 4592 CheckEquivalentExceptionSpec( 4593 PDiag(diag::err_incorrect_defaulted_exception_spec) 4594 << getSpecialMember(MD), PDiag(), 4595 ImplicitType, SourceLocation(), 4596 SpecifiedType, MD->getLocation()); 4597} 4598 4599void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4600 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4601 I != N; ++I) 4602 CheckExplicitlyDefaultedMemberExceptionSpec( 4603 DelayedDefaultedMemberExceptionSpecs[I].first, 4604 DelayedDefaultedMemberExceptionSpecs[I].second); 4605 4606 DelayedDefaultedMemberExceptionSpecs.clear(); 4607} 4608 4609namespace { 4610struct SpecialMemberDeletionInfo { 4611 Sema &S; 4612 CXXMethodDecl *MD; 4613 Sema::CXXSpecialMember CSM; 4614 bool Diagnose; 4615 4616 // Properties of the special member, computed for convenience. 4617 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4618 SourceLocation Loc; 4619 4620 bool AllFieldsAreConst; 4621 4622 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4623 Sema::CXXSpecialMember CSM, bool Diagnose) 4624 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4625 IsConstructor(false), IsAssignment(false), IsMove(false), 4626 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4627 AllFieldsAreConst(true) { 4628 switch (CSM) { 4629 case Sema::CXXDefaultConstructor: 4630 case Sema::CXXCopyConstructor: 4631 IsConstructor = true; 4632 break; 4633 case Sema::CXXMoveConstructor: 4634 IsConstructor = true; 4635 IsMove = true; 4636 break; 4637 case Sema::CXXCopyAssignment: 4638 IsAssignment = true; 4639 break; 4640 case Sema::CXXMoveAssignment: 4641 IsAssignment = true; 4642 IsMove = true; 4643 break; 4644 case Sema::CXXDestructor: 4645 break; 4646 case Sema::CXXInvalid: 4647 llvm_unreachable("invalid special member kind"); 4648 } 4649 4650 if (MD->getNumParams()) { 4651 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4652 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4653 } 4654 } 4655 4656 bool inUnion() const { return MD->getParent()->isUnion(); } 4657 4658 /// Look up the corresponding special member in the given class. 4659 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4660 unsigned Quals) { 4661 unsigned TQ = MD->getTypeQualifiers(); 4662 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4663 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4664 Quals = 0; 4665 return S.LookupSpecialMember(Class, CSM, 4666 ConstArg || (Quals & Qualifiers::Const), 4667 VolatileArg || (Quals & Qualifiers::Volatile), 4668 MD->getRefQualifier() == RQ_RValue, 4669 TQ & Qualifiers::Const, 4670 TQ & Qualifiers::Volatile); 4671 } 4672 4673 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4674 4675 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4676 bool shouldDeleteForField(FieldDecl *FD); 4677 bool shouldDeleteForAllConstMembers(); 4678 4679 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4680 unsigned Quals); 4681 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4682 Sema::SpecialMemberOverloadResult *SMOR, 4683 bool IsDtorCallInCtor); 4684 4685 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4686}; 4687} 4688 4689/// Is the given special member inaccessible when used on the given 4690/// sub-object. 4691bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4692 CXXMethodDecl *target) { 4693 /// If we're operating on a base class, the object type is the 4694 /// type of this special member. 4695 QualType objectTy; 4696 AccessSpecifier access = target->getAccess(); 4697 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4698 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4699 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4700 4701 // If we're operating on a field, the object type is the type of the field. 4702 } else { 4703 objectTy = S.Context.getTypeDeclType(target->getParent()); 4704 } 4705 4706 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4707} 4708 4709/// Check whether we should delete a special member due to the implicit 4710/// definition containing a call to a special member of a subobject. 4711bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4712 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4713 bool IsDtorCallInCtor) { 4714 CXXMethodDecl *Decl = SMOR->getMethod(); 4715 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4716 4717 int DiagKind = -1; 4718 4719 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4720 DiagKind = !Decl ? 0 : 1; 4721 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4722 DiagKind = 2; 4723 else if (!isAccessible(Subobj, Decl)) 4724 DiagKind = 3; 4725 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4726 !Decl->isTrivial()) { 4727 // A member of a union must have a trivial corresponding special member. 4728 // As a weird special case, a destructor call from a union's constructor 4729 // must be accessible and non-deleted, but need not be trivial. Such a 4730 // destructor is never actually called, but is semantically checked as 4731 // if it were. 4732 DiagKind = 4; 4733 } 4734 4735 if (DiagKind == -1) 4736 return false; 4737 4738 if (Diagnose) { 4739 if (Field) { 4740 S.Diag(Field->getLocation(), 4741 diag::note_deleted_special_member_class_subobject) 4742 << CSM << MD->getParent() << /*IsField*/true 4743 << Field << DiagKind << IsDtorCallInCtor; 4744 } else { 4745 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4746 S.Diag(Base->getLocStart(), 4747 diag::note_deleted_special_member_class_subobject) 4748 << CSM << MD->getParent() << /*IsField*/false 4749 << Base->getType() << DiagKind << IsDtorCallInCtor; 4750 } 4751 4752 if (DiagKind == 1) 4753 S.NoteDeletedFunction(Decl); 4754 // FIXME: Explain inaccessibility if DiagKind == 3. 4755 } 4756 4757 return true; 4758} 4759 4760/// Check whether we should delete a special member function due to having a 4761/// direct or virtual base class or non-static data member of class type M. 4762bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4763 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4764 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4765 4766 // C++11 [class.ctor]p5: 4767 // -- any direct or virtual base class, or non-static data member with no 4768 // brace-or-equal-initializer, has class type M (or array thereof) and 4769 // either M has no default constructor or overload resolution as applied 4770 // to M's default constructor results in an ambiguity or in a function 4771 // that is deleted or inaccessible 4772 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4773 // -- a direct or virtual base class B that cannot be copied/moved because 4774 // overload resolution, as applied to B's corresponding special member, 4775 // results in an ambiguity or a function that is deleted or inaccessible 4776 // from the defaulted special member 4777 // C++11 [class.dtor]p5: 4778 // -- any direct or virtual base class [...] has a type with a destructor 4779 // that is deleted or inaccessible 4780 if (!(CSM == Sema::CXXDefaultConstructor && 4781 Field && Field->hasInClassInitializer()) && 4782 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4783 return true; 4784 4785 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4786 // -- any direct or virtual base class or non-static data member has a 4787 // type with a destructor that is deleted or inaccessible 4788 if (IsConstructor) { 4789 Sema::SpecialMemberOverloadResult *SMOR = 4790 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4791 false, false, false, false, false); 4792 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4793 return true; 4794 } 4795 4796 return false; 4797} 4798 4799/// Check whether we should delete a special member function due to the class 4800/// having a particular direct or virtual base class. 4801bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4802 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4803 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4804} 4805 4806/// Check whether we should delete a special member function due to the class 4807/// having a particular non-static data member. 4808bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4809 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4810 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4811 4812 if (CSM == Sema::CXXDefaultConstructor) { 4813 // For a default constructor, all references must be initialized in-class 4814 // and, if a union, it must have a non-const member. 4815 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4816 if (Diagnose) 4817 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4818 << MD->getParent() << FD << FieldType << /*Reference*/0; 4819 return true; 4820 } 4821 // C++11 [class.ctor]p5: any non-variant non-static data member of 4822 // const-qualified type (or array thereof) with no 4823 // brace-or-equal-initializer does not have a user-provided default 4824 // constructor. 4825 if (!inUnion() && FieldType.isConstQualified() && 4826 !FD->hasInClassInitializer() && 4827 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4828 if (Diagnose) 4829 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4830 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4831 return true; 4832 } 4833 4834 if (inUnion() && !FieldType.isConstQualified()) 4835 AllFieldsAreConst = false; 4836 } else if (CSM == Sema::CXXCopyConstructor) { 4837 // For a copy constructor, data members must not be of rvalue reference 4838 // type. 4839 if (FieldType->isRValueReferenceType()) { 4840 if (Diagnose) 4841 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4842 << MD->getParent() << FD << FieldType; 4843 return true; 4844 } 4845 } else if (IsAssignment) { 4846 // For an assignment operator, data members must not be of reference type. 4847 if (FieldType->isReferenceType()) { 4848 if (Diagnose) 4849 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4850 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4851 return true; 4852 } 4853 if (!FieldRecord && FieldType.isConstQualified()) { 4854 // C++11 [class.copy]p23: 4855 // -- a non-static data member of const non-class type (or array thereof) 4856 if (Diagnose) 4857 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4858 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4859 return true; 4860 } 4861 } 4862 4863 if (FieldRecord) { 4864 // Some additional restrictions exist on the variant members. 4865 if (!inUnion() && FieldRecord->isUnion() && 4866 FieldRecord->isAnonymousStructOrUnion()) { 4867 bool AllVariantFieldsAreConst = true; 4868 4869 // FIXME: Handle anonymous unions declared within anonymous unions. 4870 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4871 UE = FieldRecord->field_end(); 4872 UI != UE; ++UI) { 4873 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4874 4875 if (!UnionFieldType.isConstQualified()) 4876 AllVariantFieldsAreConst = false; 4877 4878 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4879 if (UnionFieldRecord && 4880 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4881 UnionFieldType.getCVRQualifiers())) 4882 return true; 4883 } 4884 4885 // At least one member in each anonymous union must be non-const 4886 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4887 FieldRecord->field_begin() != FieldRecord->field_end()) { 4888 if (Diagnose) 4889 S.Diag(FieldRecord->getLocation(), 4890 diag::note_deleted_default_ctor_all_const) 4891 << MD->getParent() << /*anonymous union*/1; 4892 return true; 4893 } 4894 4895 // Don't check the implicit member of the anonymous union type. 4896 // This is technically non-conformant, but sanity demands it. 4897 return false; 4898 } 4899 4900 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4901 FieldType.getCVRQualifiers())) 4902 return true; 4903 } 4904 4905 return false; 4906} 4907 4908/// C++11 [class.ctor] p5: 4909/// A defaulted default constructor for a class X is defined as deleted if 4910/// X is a union and all of its variant members are of const-qualified type. 4911bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4912 // This is a silly definition, because it gives an empty union a deleted 4913 // default constructor. Don't do that. 4914 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4915 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4916 if (Diagnose) 4917 S.Diag(MD->getParent()->getLocation(), 4918 diag::note_deleted_default_ctor_all_const) 4919 << MD->getParent() << /*not anonymous union*/0; 4920 return true; 4921 } 4922 return false; 4923} 4924 4925/// Determine whether a defaulted special member function should be defined as 4926/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4927/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4928bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4929 bool Diagnose) { 4930 if (MD->isInvalidDecl()) 4931 return false; 4932 CXXRecordDecl *RD = MD->getParent(); 4933 assert(!RD->isDependentType() && "do deletion after instantiation"); 4934 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4935 return false; 4936 4937 // C++11 [expr.lambda.prim]p19: 4938 // The closure type associated with a lambda-expression has a 4939 // deleted (8.4.3) default constructor and a deleted copy 4940 // assignment operator. 4941 if (RD->isLambda() && 4942 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4943 if (Diagnose) 4944 Diag(RD->getLocation(), diag::note_lambda_decl); 4945 return true; 4946 } 4947 4948 // For an anonymous struct or union, the copy and assignment special members 4949 // will never be used, so skip the check. For an anonymous union declared at 4950 // namespace scope, the constructor and destructor are used. 4951 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4952 RD->isAnonymousStructOrUnion()) 4953 return false; 4954 4955 // C++11 [class.copy]p7, p18: 4956 // If the class definition declares a move constructor or move assignment 4957 // operator, an implicitly declared copy constructor or copy assignment 4958 // operator is defined as deleted. 4959 if (MD->isImplicit() && 4960 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4961 CXXMethodDecl *UserDeclaredMove = 0; 4962 4963 // In Microsoft mode, a user-declared move only causes the deletion of the 4964 // corresponding copy operation, not both copy operations. 4965 if (RD->hasUserDeclaredMoveConstructor() && 4966 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4967 if (!Diagnose) return true; 4968 4969 // Find any user-declared move constructor. 4970 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4971 E = RD->ctor_end(); I != E; ++I) { 4972 if (I->isMoveConstructor()) { 4973 UserDeclaredMove = *I; 4974 break; 4975 } 4976 } 4977 assert(UserDeclaredMove); 4978 } else if (RD->hasUserDeclaredMoveAssignment() && 4979 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4980 if (!Diagnose) return true; 4981 4982 // Find any user-declared move assignment operator. 4983 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4984 E = RD->method_end(); I != E; ++I) { 4985 if (I->isMoveAssignmentOperator()) { 4986 UserDeclaredMove = *I; 4987 break; 4988 } 4989 } 4990 assert(UserDeclaredMove); 4991 } 4992 4993 if (UserDeclaredMove) { 4994 Diag(UserDeclaredMove->getLocation(), 4995 diag::note_deleted_copy_user_declared_move) 4996 << (CSM == CXXCopyAssignment) << RD 4997 << UserDeclaredMove->isMoveAssignmentOperator(); 4998 return true; 4999 } 5000 } 5001 5002 // Do access control from the special member function 5003 ContextRAII MethodContext(*this, MD); 5004 5005 // C++11 [class.dtor]p5: 5006 // -- for a virtual destructor, lookup of the non-array deallocation function 5007 // results in an ambiguity or in a function that is deleted or inaccessible 5008 if (CSM == CXXDestructor && MD->isVirtual()) { 5009 FunctionDecl *OperatorDelete = 0; 5010 DeclarationName Name = 5011 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5012 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 5013 OperatorDelete, false)) { 5014 if (Diagnose) 5015 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 5016 return true; 5017 } 5018 } 5019 5020 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 5021 5022 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5023 BE = RD->bases_end(); BI != BE; ++BI) 5024 if (!BI->isVirtual() && 5025 SMI.shouldDeleteForBase(BI)) 5026 return true; 5027 5028 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 5029 BE = RD->vbases_end(); BI != BE; ++BI) 5030 if (SMI.shouldDeleteForBase(BI)) 5031 return true; 5032 5033 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5034 FE = RD->field_end(); FI != FE; ++FI) 5035 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 5036 SMI.shouldDeleteForField(*FI)) 5037 return true; 5038 5039 if (SMI.shouldDeleteForAllConstMembers()) 5040 return true; 5041 5042 return false; 5043} 5044 5045/// Perform lookup for a special member of the specified kind, and determine 5046/// whether it is trivial. If the triviality can be determined without the 5047/// lookup, skip it. This is intended for use when determining whether a 5048/// special member of a containing object is trivial, and thus does not ever 5049/// perform overload resolution for default constructors. 5050/// 5051/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 5052/// member that was most likely to be intended to be trivial, if any. 5053static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 5054 Sema::CXXSpecialMember CSM, unsigned Quals, 5055 CXXMethodDecl **Selected) { 5056 if (Selected) 5057 *Selected = 0; 5058 5059 switch (CSM) { 5060 case Sema::CXXInvalid: 5061 llvm_unreachable("not a special member"); 5062 5063 case Sema::CXXDefaultConstructor: 5064 // C++11 [class.ctor]p5: 5065 // A default constructor is trivial if: 5066 // - all the [direct subobjects] have trivial default constructors 5067 // 5068 // Note, no overload resolution is performed in this case. 5069 if (RD->hasTrivialDefaultConstructor()) 5070 return true; 5071 5072 if (Selected) { 5073 // If there's a default constructor which could have been trivial, dig it 5074 // out. Otherwise, if there's any user-provided default constructor, point 5075 // to that as an example of why there's not a trivial one. 5076 CXXConstructorDecl *DefCtor = 0; 5077 if (RD->needsImplicitDefaultConstructor()) 5078 S.DeclareImplicitDefaultConstructor(RD); 5079 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 5080 CE = RD->ctor_end(); CI != CE; ++CI) { 5081 if (!CI->isDefaultConstructor()) 5082 continue; 5083 DefCtor = *CI; 5084 if (!DefCtor->isUserProvided()) 5085 break; 5086 } 5087 5088 *Selected = DefCtor; 5089 } 5090 5091 return false; 5092 5093 case Sema::CXXDestructor: 5094 // C++11 [class.dtor]p5: 5095 // A destructor is trivial if: 5096 // - all the direct [subobjects] have trivial destructors 5097 if (RD->hasTrivialDestructor()) 5098 return true; 5099 5100 if (Selected) { 5101 if (RD->needsImplicitDestructor()) 5102 S.DeclareImplicitDestructor(RD); 5103 *Selected = RD->getDestructor(); 5104 } 5105 5106 return false; 5107 5108 case Sema::CXXCopyConstructor: 5109 // C++11 [class.copy]p12: 5110 // A copy constructor is trivial if: 5111 // - the constructor selected to copy each direct [subobject] is trivial 5112 if (RD->hasTrivialCopyConstructor()) { 5113 if (Quals == Qualifiers::Const) 5114 // We must either select the trivial copy constructor or reach an 5115 // ambiguity; no need to actually perform overload resolution. 5116 return true; 5117 } else if (!Selected) { 5118 return false; 5119 } 5120 // In C++98, we are not supposed to perform overload resolution here, but we 5121 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 5122 // cases like B as having a non-trivial copy constructor: 5123 // struct A { template<typename T> A(T&); }; 5124 // struct B { mutable A a; }; 5125 goto NeedOverloadResolution; 5126 5127 case Sema::CXXCopyAssignment: 5128 // C++11 [class.copy]p25: 5129 // A copy assignment operator is trivial if: 5130 // - the assignment operator selected to copy each direct [subobject] is 5131 // trivial 5132 if (RD->hasTrivialCopyAssignment()) { 5133 if (Quals == Qualifiers::Const) 5134 return true; 5135 } else if (!Selected) { 5136 return false; 5137 } 5138 // In C++98, we are not supposed to perform overload resolution here, but we 5139 // treat that as a language defect. 5140 goto NeedOverloadResolution; 5141 5142 case Sema::CXXMoveConstructor: 5143 case Sema::CXXMoveAssignment: 5144 NeedOverloadResolution: 5145 Sema::SpecialMemberOverloadResult *SMOR = 5146 S.LookupSpecialMember(RD, CSM, 5147 Quals & Qualifiers::Const, 5148 Quals & Qualifiers::Volatile, 5149 /*RValueThis*/false, /*ConstThis*/false, 5150 /*VolatileThis*/false); 5151 5152 // The standard doesn't describe how to behave if the lookup is ambiguous. 5153 // We treat it as not making the member non-trivial, just like the standard 5154 // mandates for the default constructor. This should rarely matter, because 5155 // the member will also be deleted. 5156 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5157 return true; 5158 5159 if (!SMOR->getMethod()) { 5160 assert(SMOR->getKind() == 5161 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5162 return false; 5163 } 5164 5165 // We deliberately don't check if we found a deleted special member. We're 5166 // not supposed to! 5167 if (Selected) 5168 *Selected = SMOR->getMethod(); 5169 return SMOR->getMethod()->isTrivial(); 5170 } 5171 5172 llvm_unreachable("unknown special method kind"); 5173} 5174 5175static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5176 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5177 CI != CE; ++CI) 5178 if (!CI->isImplicit()) 5179 return *CI; 5180 5181 // Look for constructor templates. 5182 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5183 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5184 if (CXXConstructorDecl *CD = 5185 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5186 return CD; 5187 } 5188 5189 return 0; 5190} 5191 5192/// The kind of subobject we are checking for triviality. The values of this 5193/// enumeration are used in diagnostics. 5194enum TrivialSubobjectKind { 5195 /// The subobject is a base class. 5196 TSK_BaseClass, 5197 /// The subobject is a non-static data member. 5198 TSK_Field, 5199 /// The object is actually the complete object. 5200 TSK_CompleteObject 5201}; 5202 5203/// Check whether the special member selected for a given type would be trivial. 5204static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5205 QualType SubType, 5206 Sema::CXXSpecialMember CSM, 5207 TrivialSubobjectKind Kind, 5208 bool Diagnose) { 5209 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5210 if (!SubRD) 5211 return true; 5212 5213 CXXMethodDecl *Selected; 5214 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5215 Diagnose ? &Selected : 0)) 5216 return true; 5217 5218 if (Diagnose) { 5219 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5220 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5221 << Kind << SubType.getUnqualifiedType(); 5222 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5223 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5224 } else if (!Selected) 5225 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5226 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5227 else if (Selected->isUserProvided()) { 5228 if (Kind == TSK_CompleteObject) 5229 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5230 << Kind << SubType.getUnqualifiedType() << CSM; 5231 else { 5232 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5233 << Kind << SubType.getUnqualifiedType() << CSM; 5234 S.Diag(Selected->getLocation(), diag::note_declared_at); 5235 } 5236 } else { 5237 if (Kind != TSK_CompleteObject) 5238 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5239 << Kind << SubType.getUnqualifiedType() << CSM; 5240 5241 // Explain why the defaulted or deleted special member isn't trivial. 5242 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5243 } 5244 } 5245 5246 return false; 5247} 5248 5249/// Check whether the members of a class type allow a special member to be 5250/// trivial. 5251static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5252 Sema::CXXSpecialMember CSM, 5253 bool ConstArg, bool Diagnose) { 5254 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5255 FE = RD->field_end(); FI != FE; ++FI) { 5256 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5257 continue; 5258 5259 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5260 5261 // Pretend anonymous struct or union members are members of this class. 5262 if (FI->isAnonymousStructOrUnion()) { 5263 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5264 CSM, ConstArg, Diagnose)) 5265 return false; 5266 continue; 5267 } 5268 5269 // C++11 [class.ctor]p5: 5270 // A default constructor is trivial if [...] 5271 // -- no non-static data member of its class has a 5272 // brace-or-equal-initializer 5273 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5274 if (Diagnose) 5275 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5276 return false; 5277 } 5278 5279 // Objective C ARC 4.3.5: 5280 // [...] nontrivally ownership-qualified types are [...] not trivially 5281 // default constructible, copy constructible, move constructible, copy 5282 // assignable, move assignable, or destructible [...] 5283 if (S.getLangOpts().ObjCAutoRefCount && 5284 FieldType.hasNonTrivialObjCLifetime()) { 5285 if (Diagnose) 5286 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5287 << RD << FieldType.getObjCLifetime(); 5288 return false; 5289 } 5290 5291 if (ConstArg && !FI->isMutable()) 5292 FieldType.addConst(); 5293 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5294 TSK_Field, Diagnose)) 5295 return false; 5296 } 5297 5298 return true; 5299} 5300 5301/// Diagnose why the specified class does not have a trivial special member of 5302/// the given kind. 5303void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5304 QualType Ty = Context.getRecordType(RD); 5305 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5306 Ty.addConst(); 5307 5308 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5309 TSK_CompleteObject, /*Diagnose*/true); 5310} 5311 5312/// Determine whether a defaulted or deleted special member function is trivial, 5313/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5314/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5315bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5316 bool Diagnose) { 5317 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5318 5319 CXXRecordDecl *RD = MD->getParent(); 5320 5321 bool ConstArg = false; 5322 5323 // C++11 [class.copy]p12, p25: 5324 // A [special member] is trivial if its declared parameter type is the same 5325 // as if it had been implicitly declared [...] 5326 switch (CSM) { 5327 case CXXDefaultConstructor: 5328 case CXXDestructor: 5329 // Trivial default constructors and destructors cannot have parameters. 5330 break; 5331 5332 case CXXCopyConstructor: 5333 case CXXCopyAssignment: { 5334 // Trivial copy operations always have const, non-volatile parameter types. 5335 ConstArg = true; 5336 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5337 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5338 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5339 if (Diagnose) 5340 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5341 << Param0->getSourceRange() << Param0->getType() 5342 << Context.getLValueReferenceType( 5343 Context.getRecordType(RD).withConst()); 5344 return false; 5345 } 5346 break; 5347 } 5348 5349 case CXXMoveConstructor: 5350 case CXXMoveAssignment: { 5351 // Trivial move operations always have non-cv-qualified parameters. 5352 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5353 const RValueReferenceType *RT = 5354 Param0->getType()->getAs<RValueReferenceType>(); 5355 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5356 if (Diagnose) 5357 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5358 << Param0->getSourceRange() << Param0->getType() 5359 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5360 return false; 5361 } 5362 break; 5363 } 5364 5365 case CXXInvalid: 5366 llvm_unreachable("not a special member"); 5367 } 5368 5369 // FIXME: We require that the parameter-declaration-clause is equivalent to 5370 // that of an implicit declaration, not just that the declared parameter type 5371 // matches, in order to prevent absuridities like a function simultaneously 5372 // being a trivial copy constructor and a non-trivial default constructor. 5373 // This issue has not yet been assigned a core issue number. 5374 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5375 if (Diagnose) 5376 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5377 diag::note_nontrivial_default_arg) 5378 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5379 return false; 5380 } 5381 if (MD->isVariadic()) { 5382 if (Diagnose) 5383 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5384 return false; 5385 } 5386 5387 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5388 // A copy/move [constructor or assignment operator] is trivial if 5389 // -- the [member] selected to copy/move each direct base class subobject 5390 // is trivial 5391 // 5392 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5393 // A [default constructor or destructor] is trivial if 5394 // -- all the direct base classes have trivial [default constructors or 5395 // destructors] 5396 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5397 BE = RD->bases_end(); BI != BE; ++BI) 5398 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5399 ConstArg ? BI->getType().withConst() 5400 : BI->getType(), 5401 CSM, TSK_BaseClass, Diagnose)) 5402 return false; 5403 5404 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5405 // A copy/move [constructor or assignment operator] for a class X is 5406 // trivial if 5407 // -- for each non-static data member of X that is of class type (or array 5408 // thereof), the constructor selected to copy/move that member is 5409 // trivial 5410 // 5411 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5412 // A [default constructor or destructor] is trivial if 5413 // -- for all of the non-static data members of its class that are of class 5414 // type (or array thereof), each such class has a trivial [default 5415 // constructor or destructor] 5416 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5417 return false; 5418 5419 // C++11 [class.dtor]p5: 5420 // A destructor is trivial if [...] 5421 // -- the destructor is not virtual 5422 if (CSM == CXXDestructor && MD->isVirtual()) { 5423 if (Diagnose) 5424 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5425 return false; 5426 } 5427 5428 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5429 // A [special member] for class X is trivial if [...] 5430 // -- class X has no virtual functions and no virtual base classes 5431 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5432 if (!Diagnose) 5433 return false; 5434 5435 if (RD->getNumVBases()) { 5436 // Check for virtual bases. We already know that the corresponding 5437 // member in all bases is trivial, so vbases must all be direct. 5438 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5439 assert(BS.isVirtual()); 5440 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5441 return false; 5442 } 5443 5444 // Must have a virtual method. 5445 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5446 ME = RD->method_end(); MI != ME; ++MI) { 5447 if (MI->isVirtual()) { 5448 SourceLocation MLoc = MI->getLocStart(); 5449 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5450 return false; 5451 } 5452 } 5453 5454 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5455 } 5456 5457 // Looks like it's trivial! 5458 return true; 5459} 5460 5461/// \brief Data used with FindHiddenVirtualMethod 5462namespace { 5463 struct FindHiddenVirtualMethodData { 5464 Sema *S; 5465 CXXMethodDecl *Method; 5466 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5467 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5468 }; 5469} 5470 5471/// \brief Check whether any most overriden method from MD in Methods 5472static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5473 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5474 if (MD->size_overridden_methods() == 0) 5475 return Methods.count(MD->getCanonicalDecl()); 5476 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5477 E = MD->end_overridden_methods(); 5478 I != E; ++I) 5479 if (CheckMostOverridenMethods(*I, Methods)) 5480 return true; 5481 return false; 5482} 5483 5484/// \brief Member lookup function that determines whether a given C++ 5485/// method overloads virtual methods in a base class without overriding any, 5486/// to be used with CXXRecordDecl::lookupInBases(). 5487static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5488 CXXBasePath &Path, 5489 void *UserData) { 5490 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5491 5492 FindHiddenVirtualMethodData &Data 5493 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5494 5495 DeclarationName Name = Data.Method->getDeclName(); 5496 assert(Name.getNameKind() == DeclarationName::Identifier); 5497 5498 bool foundSameNameMethod = false; 5499 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5500 for (Path.Decls = BaseRecord->lookup(Name); 5501 !Path.Decls.empty(); 5502 Path.Decls = Path.Decls.slice(1)) { 5503 NamedDecl *D = Path.Decls.front(); 5504 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5505 MD = MD->getCanonicalDecl(); 5506 foundSameNameMethod = true; 5507 // Interested only in hidden virtual methods. 5508 if (!MD->isVirtual()) 5509 continue; 5510 // If the method we are checking overrides a method from its base 5511 // don't warn about the other overloaded methods. 5512 if (!Data.S->IsOverload(Data.Method, MD, false)) 5513 return true; 5514 // Collect the overload only if its hidden. 5515 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5516 overloadedMethods.push_back(MD); 5517 } 5518 } 5519 5520 if (foundSameNameMethod) 5521 Data.OverloadedMethods.append(overloadedMethods.begin(), 5522 overloadedMethods.end()); 5523 return foundSameNameMethod; 5524} 5525 5526/// \brief Add the most overriden methods from MD to Methods 5527static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5528 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5529 if (MD->size_overridden_methods() == 0) 5530 Methods.insert(MD->getCanonicalDecl()); 5531 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5532 E = MD->end_overridden_methods(); 5533 I != E; ++I) 5534 AddMostOverridenMethods(*I, Methods); 5535} 5536 5537/// \brief See if a method overloads virtual methods in a base class without 5538/// overriding any. 5539void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5540 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5541 MD->getLocation()) == DiagnosticsEngine::Ignored) 5542 return; 5543 if (!MD->getDeclName().isIdentifier()) 5544 return; 5545 5546 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5547 /*bool RecordPaths=*/false, 5548 /*bool DetectVirtual=*/false); 5549 FindHiddenVirtualMethodData Data; 5550 Data.Method = MD; 5551 Data.S = this; 5552 5553 // Keep the base methods that were overriden or introduced in the subclass 5554 // by 'using' in a set. A base method not in this set is hidden. 5555 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5556 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5557 NamedDecl *ND = *I; 5558 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5559 ND = shad->getTargetDecl(); 5560 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5561 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5562 } 5563 5564 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5565 !Data.OverloadedMethods.empty()) { 5566 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5567 << MD << (Data.OverloadedMethods.size() > 1); 5568 5569 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5570 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5571 PartialDiagnostic PD = PDiag( 5572 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5573 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5574 Diag(overloadedMD->getLocation(), PD); 5575 } 5576 } 5577} 5578 5579void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5580 Decl *TagDecl, 5581 SourceLocation LBrac, 5582 SourceLocation RBrac, 5583 AttributeList *AttrList) { 5584 if (!TagDecl) 5585 return; 5586 5587 AdjustDeclIfTemplate(TagDecl); 5588 5589 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5590 if (l->getKind() != AttributeList::AT_Visibility) 5591 continue; 5592 l->setInvalid(); 5593 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5594 l->getName(); 5595 } 5596 5597 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5598 // strict aliasing violation! 5599 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5600 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5601 5602 CheckCompletedCXXClass( 5603 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5604} 5605 5606/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5607/// special functions, such as the default constructor, copy 5608/// constructor, or destructor, to the given C++ class (C++ 5609/// [special]p1). This routine can only be executed just before the 5610/// definition of the class is complete. 5611void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5612 if (!ClassDecl->hasUserDeclaredConstructor()) 5613 ++ASTContext::NumImplicitDefaultConstructors; 5614 5615 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5616 ++ASTContext::NumImplicitCopyConstructors; 5617 5618 // If the properties or semantics of the copy constructor couldn't be 5619 // determined while the class was being declared, force a declaration 5620 // of it now. 5621 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5622 DeclareImplicitCopyConstructor(ClassDecl); 5623 } 5624 5625 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5626 ++ASTContext::NumImplicitMoveConstructors; 5627 5628 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5629 DeclareImplicitMoveConstructor(ClassDecl); 5630 } 5631 5632 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5633 ++ASTContext::NumImplicitCopyAssignmentOperators; 5634 5635 // If we have a dynamic class, then the copy assignment operator may be 5636 // virtual, so we have to declare it immediately. This ensures that, e.g., 5637 // it shows up in the right place in the vtable and that we diagnose 5638 // problems with the implicit exception specification. 5639 if (ClassDecl->isDynamicClass() || 5640 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5641 DeclareImplicitCopyAssignment(ClassDecl); 5642 } 5643 5644 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5645 ++ASTContext::NumImplicitMoveAssignmentOperators; 5646 5647 // Likewise for the move assignment operator. 5648 if (ClassDecl->isDynamicClass() || 5649 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5650 DeclareImplicitMoveAssignment(ClassDecl); 5651 } 5652 5653 if (!ClassDecl->hasUserDeclaredDestructor()) { 5654 ++ASTContext::NumImplicitDestructors; 5655 5656 // If we have a dynamic class, then the destructor may be virtual, so we 5657 // have to declare the destructor immediately. This ensures that, e.g., it 5658 // shows up in the right place in the vtable and that we diagnose problems 5659 // with the implicit exception specification. 5660 if (ClassDecl->isDynamicClass() || 5661 ClassDecl->needsOverloadResolutionForDestructor()) 5662 DeclareImplicitDestructor(ClassDecl); 5663 } 5664} 5665 5666void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5667 if (!D) 5668 return; 5669 5670 int NumParamList = D->getNumTemplateParameterLists(); 5671 for (int i = 0; i < NumParamList; i++) { 5672 TemplateParameterList* Params = D->getTemplateParameterList(i); 5673 for (TemplateParameterList::iterator Param = Params->begin(), 5674 ParamEnd = Params->end(); 5675 Param != ParamEnd; ++Param) { 5676 NamedDecl *Named = cast<NamedDecl>(*Param); 5677 if (Named->getDeclName()) { 5678 S->AddDecl(Named); 5679 IdResolver.AddDecl(Named); 5680 } 5681 } 5682 } 5683} 5684 5685void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5686 if (!D) 5687 return; 5688 5689 TemplateParameterList *Params = 0; 5690 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5691 Params = Template->getTemplateParameters(); 5692 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5693 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5694 Params = PartialSpec->getTemplateParameters(); 5695 else 5696 return; 5697 5698 for (TemplateParameterList::iterator Param = Params->begin(), 5699 ParamEnd = Params->end(); 5700 Param != ParamEnd; ++Param) { 5701 NamedDecl *Named = cast<NamedDecl>(*Param); 5702 if (Named->getDeclName()) { 5703 S->AddDecl(Named); 5704 IdResolver.AddDecl(Named); 5705 } 5706 } 5707} 5708 5709void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5710 if (!RecordD) return; 5711 AdjustDeclIfTemplate(RecordD); 5712 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5713 PushDeclContext(S, Record); 5714} 5715 5716void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5717 if (!RecordD) return; 5718 PopDeclContext(); 5719} 5720 5721/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5722/// parsing a top-level (non-nested) C++ class, and we are now 5723/// parsing those parts of the given Method declaration that could 5724/// not be parsed earlier (C++ [class.mem]p2), such as default 5725/// arguments. This action should enter the scope of the given 5726/// Method declaration as if we had just parsed the qualified method 5727/// name. However, it should not bring the parameters into scope; 5728/// that will be performed by ActOnDelayedCXXMethodParameter. 5729void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5730} 5731 5732/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5733/// C++ method declaration. We're (re-)introducing the given 5734/// function parameter into scope for use in parsing later parts of 5735/// the method declaration. For example, we could see an 5736/// ActOnParamDefaultArgument event for this parameter. 5737void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5738 if (!ParamD) 5739 return; 5740 5741 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5742 5743 // If this parameter has an unparsed default argument, clear it out 5744 // to make way for the parsed default argument. 5745 if (Param->hasUnparsedDefaultArg()) 5746 Param->setDefaultArg(0); 5747 5748 S->AddDecl(Param); 5749 if (Param->getDeclName()) 5750 IdResolver.AddDecl(Param); 5751} 5752 5753/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5754/// processing the delayed method declaration for Method. The method 5755/// declaration is now considered finished. There may be a separate 5756/// ActOnStartOfFunctionDef action later (not necessarily 5757/// immediately!) for this method, if it was also defined inside the 5758/// class body. 5759void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5760 if (!MethodD) 5761 return; 5762 5763 AdjustDeclIfTemplate(MethodD); 5764 5765 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5766 5767 // Now that we have our default arguments, check the constructor 5768 // again. It could produce additional diagnostics or affect whether 5769 // the class has implicitly-declared destructors, among other 5770 // things. 5771 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5772 CheckConstructor(Constructor); 5773 5774 // Check the default arguments, which we may have added. 5775 if (!Method->isInvalidDecl()) 5776 CheckCXXDefaultArguments(Method); 5777} 5778 5779/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5780/// the well-formedness of the constructor declarator @p D with type @p 5781/// R. If there are any errors in the declarator, this routine will 5782/// emit diagnostics and set the invalid bit to true. In any case, the type 5783/// will be updated to reflect a well-formed type for the constructor and 5784/// returned. 5785QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5786 StorageClass &SC) { 5787 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5788 5789 // C++ [class.ctor]p3: 5790 // A constructor shall not be virtual (10.3) or static (9.4). A 5791 // constructor can be invoked for a const, volatile or const 5792 // volatile object. A constructor shall not be declared const, 5793 // volatile, or const volatile (9.3.2). 5794 if (isVirtual) { 5795 if (!D.isInvalidType()) 5796 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5797 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5798 << SourceRange(D.getIdentifierLoc()); 5799 D.setInvalidType(); 5800 } 5801 if (SC == SC_Static) { 5802 if (!D.isInvalidType()) 5803 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5804 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5805 << SourceRange(D.getIdentifierLoc()); 5806 D.setInvalidType(); 5807 SC = SC_None; 5808 } 5809 5810 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5811 if (FTI.TypeQuals != 0) { 5812 if (FTI.TypeQuals & Qualifiers::Const) 5813 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5814 << "const" << SourceRange(D.getIdentifierLoc()); 5815 if (FTI.TypeQuals & Qualifiers::Volatile) 5816 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5817 << "volatile" << SourceRange(D.getIdentifierLoc()); 5818 if (FTI.TypeQuals & Qualifiers::Restrict) 5819 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5820 << "restrict" << SourceRange(D.getIdentifierLoc()); 5821 D.setInvalidType(); 5822 } 5823 5824 // C++0x [class.ctor]p4: 5825 // A constructor shall not be declared with a ref-qualifier. 5826 if (FTI.hasRefQualifier()) { 5827 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5828 << FTI.RefQualifierIsLValueRef 5829 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5830 D.setInvalidType(); 5831 } 5832 5833 // Rebuild the function type "R" without any type qualifiers (in 5834 // case any of the errors above fired) and with "void" as the 5835 // return type, since constructors don't have return types. 5836 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5837 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5838 return R; 5839 5840 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5841 EPI.TypeQuals = 0; 5842 EPI.RefQualifier = RQ_None; 5843 5844 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5845} 5846 5847/// CheckConstructor - Checks a fully-formed constructor for 5848/// well-formedness, issuing any diagnostics required. Returns true if 5849/// the constructor declarator is invalid. 5850void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5851 CXXRecordDecl *ClassDecl 5852 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5853 if (!ClassDecl) 5854 return Constructor->setInvalidDecl(); 5855 5856 // C++ [class.copy]p3: 5857 // A declaration of a constructor for a class X is ill-formed if 5858 // its first parameter is of type (optionally cv-qualified) X and 5859 // either there are no other parameters or else all other 5860 // parameters have default arguments. 5861 if (!Constructor->isInvalidDecl() && 5862 ((Constructor->getNumParams() == 1) || 5863 (Constructor->getNumParams() > 1 && 5864 Constructor->getParamDecl(1)->hasDefaultArg())) && 5865 Constructor->getTemplateSpecializationKind() 5866 != TSK_ImplicitInstantiation) { 5867 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5868 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5869 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5870 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5871 const char *ConstRef 5872 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5873 : " const &"; 5874 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5875 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5876 5877 // FIXME: Rather that making the constructor invalid, we should endeavor 5878 // to fix the type. 5879 Constructor->setInvalidDecl(); 5880 } 5881 } 5882} 5883 5884/// CheckDestructor - Checks a fully-formed destructor definition for 5885/// well-formedness, issuing any diagnostics required. Returns true 5886/// on error. 5887bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5888 CXXRecordDecl *RD = Destructor->getParent(); 5889 5890 if (!Destructor->getOperatorDelete() && Destructor->isVirtual()) { 5891 SourceLocation Loc; 5892 5893 if (!Destructor->isImplicit()) 5894 Loc = Destructor->getLocation(); 5895 else 5896 Loc = RD->getLocation(); 5897 5898 // If we have a virtual destructor, look up the deallocation function 5899 FunctionDecl *OperatorDelete = 0; 5900 DeclarationName Name = 5901 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5902 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5903 return true; 5904 5905 MarkFunctionReferenced(Loc, OperatorDelete); 5906 5907 Destructor->setOperatorDelete(OperatorDelete); 5908 } 5909 5910 return false; 5911} 5912 5913static inline bool 5914FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5915 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5916 FTI.ArgInfo[0].Param && 5917 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5918} 5919 5920/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5921/// the well-formednes of the destructor declarator @p D with type @p 5922/// R. If there are any errors in the declarator, this routine will 5923/// emit diagnostics and set the declarator to invalid. Even if this happens, 5924/// will be updated to reflect a well-formed type for the destructor and 5925/// returned. 5926QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5927 StorageClass& SC) { 5928 // C++ [class.dtor]p1: 5929 // [...] A typedef-name that names a class is a class-name 5930 // (7.1.3); however, a typedef-name that names a class shall not 5931 // be used as the identifier in the declarator for a destructor 5932 // declaration. 5933 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5934 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5935 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5936 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5937 else if (const TemplateSpecializationType *TST = 5938 DeclaratorType->getAs<TemplateSpecializationType>()) 5939 if (TST->isTypeAlias()) 5940 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5941 << DeclaratorType << 1; 5942 5943 // C++ [class.dtor]p2: 5944 // A destructor is used to destroy objects of its class type. A 5945 // destructor takes no parameters, and no return type can be 5946 // specified for it (not even void). The address of a destructor 5947 // shall not be taken. A destructor shall not be static. A 5948 // destructor can be invoked for a const, volatile or const 5949 // volatile object. A destructor shall not be declared const, 5950 // volatile or const volatile (9.3.2). 5951 if (SC == SC_Static) { 5952 if (!D.isInvalidType()) 5953 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5954 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5955 << SourceRange(D.getIdentifierLoc()) 5956 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5957 5958 SC = SC_None; 5959 } 5960 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5961 // Destructors don't have return types, but the parser will 5962 // happily parse something like: 5963 // 5964 // class X { 5965 // float ~X(); 5966 // }; 5967 // 5968 // The return type will be eliminated later. 5969 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5970 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5971 << SourceRange(D.getIdentifierLoc()); 5972 } 5973 5974 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5975 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5976 if (FTI.TypeQuals & Qualifiers::Const) 5977 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5978 << "const" << SourceRange(D.getIdentifierLoc()); 5979 if (FTI.TypeQuals & Qualifiers::Volatile) 5980 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5981 << "volatile" << SourceRange(D.getIdentifierLoc()); 5982 if (FTI.TypeQuals & Qualifiers::Restrict) 5983 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5984 << "restrict" << SourceRange(D.getIdentifierLoc()); 5985 D.setInvalidType(); 5986 } 5987 5988 // C++0x [class.dtor]p2: 5989 // A destructor shall not be declared with a ref-qualifier. 5990 if (FTI.hasRefQualifier()) { 5991 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5992 << FTI.RefQualifierIsLValueRef 5993 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5994 D.setInvalidType(); 5995 } 5996 5997 // Make sure we don't have any parameters. 5998 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5999 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 6000 6001 // Delete the parameters. 6002 FTI.freeArgs(); 6003 D.setInvalidType(); 6004 } 6005 6006 // Make sure the destructor isn't variadic. 6007 if (FTI.isVariadic) { 6008 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 6009 D.setInvalidType(); 6010 } 6011 6012 // Rebuild the function type "R" without any type qualifiers or 6013 // parameters (in case any of the errors above fired) and with 6014 // "void" as the return type, since destructors don't have return 6015 // types. 6016 if (!D.isInvalidType()) 6017 return R; 6018 6019 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6020 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 6021 EPI.Variadic = false; 6022 EPI.TypeQuals = 0; 6023 EPI.RefQualifier = RQ_None; 6024 return Context.getFunctionType(Context.VoidTy, None, EPI); 6025} 6026 6027/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 6028/// well-formednes of the conversion function declarator @p D with 6029/// type @p R. If there are any errors in the declarator, this routine 6030/// will emit diagnostics and return true. Otherwise, it will return 6031/// false. Either way, the type @p R will be updated to reflect a 6032/// well-formed type for the conversion operator. 6033void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 6034 StorageClass& SC) { 6035 // C++ [class.conv.fct]p1: 6036 // Neither parameter types nor return type can be specified. The 6037 // type of a conversion function (8.3.5) is "function taking no 6038 // parameter returning conversion-type-id." 6039 if (SC == SC_Static) { 6040 if (!D.isInvalidType()) 6041 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 6042 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 6043 << SourceRange(D.getIdentifierLoc()); 6044 D.setInvalidType(); 6045 SC = SC_None; 6046 } 6047 6048 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 6049 6050 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 6051 // Conversion functions don't have return types, but the parser will 6052 // happily parse something like: 6053 // 6054 // class X { 6055 // float operator bool(); 6056 // }; 6057 // 6058 // The return type will be changed later anyway. 6059 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 6060 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 6061 << SourceRange(D.getIdentifierLoc()); 6062 D.setInvalidType(); 6063 } 6064 6065 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 6066 6067 // Make sure we don't have any parameters. 6068 if (Proto->getNumArgs() > 0) { 6069 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 6070 6071 // Delete the parameters. 6072 D.getFunctionTypeInfo().freeArgs(); 6073 D.setInvalidType(); 6074 } else if (Proto->isVariadic()) { 6075 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 6076 D.setInvalidType(); 6077 } 6078 6079 // Diagnose "&operator bool()" and other such nonsense. This 6080 // is actually a gcc extension which we don't support. 6081 if (Proto->getResultType() != ConvType) { 6082 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 6083 << Proto->getResultType(); 6084 D.setInvalidType(); 6085 ConvType = Proto->getResultType(); 6086 } 6087 6088 // C++ [class.conv.fct]p4: 6089 // The conversion-type-id shall not represent a function type nor 6090 // an array type. 6091 if (ConvType->isArrayType()) { 6092 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 6093 ConvType = Context.getPointerType(ConvType); 6094 D.setInvalidType(); 6095 } else if (ConvType->isFunctionType()) { 6096 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 6097 ConvType = Context.getPointerType(ConvType); 6098 D.setInvalidType(); 6099 } 6100 6101 // Rebuild the function type "R" without any parameters (in case any 6102 // of the errors above fired) and with the conversion type as the 6103 // return type. 6104 if (D.isInvalidType()) 6105 R = Context.getFunctionType(ConvType, None, Proto->getExtProtoInfo()); 6106 6107 // C++0x explicit conversion operators. 6108 if (D.getDeclSpec().isExplicitSpecified()) 6109 Diag(D.getDeclSpec().getExplicitSpecLoc(), 6110 getLangOpts().CPlusPlus11 ? 6111 diag::warn_cxx98_compat_explicit_conversion_functions : 6112 diag::ext_explicit_conversion_functions) 6113 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 6114} 6115 6116/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 6117/// the declaration of the given C++ conversion function. This routine 6118/// is responsible for recording the conversion function in the C++ 6119/// class, if possible. 6120Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 6121 assert(Conversion && "Expected to receive a conversion function declaration"); 6122 6123 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 6124 6125 // Make sure we aren't redeclaring the conversion function. 6126 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 6127 6128 // C++ [class.conv.fct]p1: 6129 // [...] A conversion function is never used to convert a 6130 // (possibly cv-qualified) object to the (possibly cv-qualified) 6131 // same object type (or a reference to it), to a (possibly 6132 // cv-qualified) base class of that type (or a reference to it), 6133 // or to (possibly cv-qualified) void. 6134 // FIXME: Suppress this warning if the conversion function ends up being a 6135 // virtual function that overrides a virtual function in a base class. 6136 QualType ClassType 6137 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 6138 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 6139 ConvType = ConvTypeRef->getPointeeType(); 6140 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 6141 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 6142 /* Suppress diagnostics for instantiations. */; 6143 else if (ConvType->isRecordType()) { 6144 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6145 if (ConvType == ClassType) 6146 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6147 << ClassType; 6148 else if (IsDerivedFrom(ClassType, ConvType)) 6149 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6150 << ClassType << ConvType; 6151 } else if (ConvType->isVoidType()) { 6152 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6153 << ClassType << ConvType; 6154 } 6155 6156 if (FunctionTemplateDecl *ConversionTemplate 6157 = Conversion->getDescribedFunctionTemplate()) 6158 return ConversionTemplate; 6159 6160 return Conversion; 6161} 6162 6163//===----------------------------------------------------------------------===// 6164// Namespace Handling 6165//===----------------------------------------------------------------------===// 6166 6167/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6168/// reopened. 6169static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6170 SourceLocation Loc, 6171 IdentifierInfo *II, bool *IsInline, 6172 NamespaceDecl *PrevNS) { 6173 assert(*IsInline != PrevNS->isInline()); 6174 6175 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6176 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6177 // inline namespaces, with the intention of bringing names into namespace std. 6178 // 6179 // We support this just well enough to get that case working; this is not 6180 // sufficient to support reopening namespaces as inline in general. 6181 if (*IsInline && II && II->getName().startswith("__atomic") && 6182 S.getSourceManager().isInSystemHeader(Loc)) { 6183 // Mark all prior declarations of the namespace as inline. 6184 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6185 NS = NS->getPreviousDecl()) 6186 NS->setInline(*IsInline); 6187 // Patch up the lookup table for the containing namespace. This isn't really 6188 // correct, but it's good enough for this particular case. 6189 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6190 E = PrevNS->decls_end(); I != E; ++I) 6191 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6192 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6193 return; 6194 } 6195 6196 if (PrevNS->isInline()) 6197 // The user probably just forgot the 'inline', so suggest that it 6198 // be added back. 6199 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6200 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6201 else 6202 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6203 << IsInline; 6204 6205 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6206 *IsInline = PrevNS->isInline(); 6207} 6208 6209/// ActOnStartNamespaceDef - This is called at the start of a namespace 6210/// definition. 6211Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6212 SourceLocation InlineLoc, 6213 SourceLocation NamespaceLoc, 6214 SourceLocation IdentLoc, 6215 IdentifierInfo *II, 6216 SourceLocation LBrace, 6217 AttributeList *AttrList) { 6218 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6219 // For anonymous namespace, take the location of the left brace. 6220 SourceLocation Loc = II ? IdentLoc : LBrace; 6221 bool IsInline = InlineLoc.isValid(); 6222 bool IsInvalid = false; 6223 bool IsStd = false; 6224 bool AddToKnown = false; 6225 Scope *DeclRegionScope = NamespcScope->getParent(); 6226 6227 NamespaceDecl *PrevNS = 0; 6228 if (II) { 6229 // C++ [namespace.def]p2: 6230 // The identifier in an original-namespace-definition shall not 6231 // have been previously defined in the declarative region in 6232 // which the original-namespace-definition appears. The 6233 // identifier in an original-namespace-definition is the name of 6234 // the namespace. Subsequently in that declarative region, it is 6235 // treated as an original-namespace-name. 6236 // 6237 // Since namespace names are unique in their scope, and we don't 6238 // look through using directives, just look for any ordinary names. 6239 6240 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6241 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6242 Decl::IDNS_Namespace; 6243 NamedDecl *PrevDecl = 0; 6244 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6245 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6246 ++I) { 6247 if ((*I)->getIdentifierNamespace() & IDNS) { 6248 PrevDecl = *I; 6249 break; 6250 } 6251 } 6252 6253 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6254 6255 if (PrevNS) { 6256 // This is an extended namespace definition. 6257 if (IsInline != PrevNS->isInline()) 6258 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6259 &IsInline, PrevNS); 6260 } else if (PrevDecl) { 6261 // This is an invalid name redefinition. 6262 Diag(Loc, diag::err_redefinition_different_kind) 6263 << II; 6264 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6265 IsInvalid = true; 6266 // Continue on to push Namespc as current DeclContext and return it. 6267 } else if (II->isStr("std") && 6268 CurContext->getRedeclContext()->isTranslationUnit()) { 6269 // This is the first "real" definition of the namespace "std", so update 6270 // our cache of the "std" namespace to point at this definition. 6271 PrevNS = getStdNamespace(); 6272 IsStd = true; 6273 AddToKnown = !IsInline; 6274 } else { 6275 // We've seen this namespace for the first time. 6276 AddToKnown = !IsInline; 6277 } 6278 } else { 6279 // Anonymous namespaces. 6280 6281 // Determine whether the parent already has an anonymous namespace. 6282 DeclContext *Parent = CurContext->getRedeclContext(); 6283 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6284 PrevNS = TU->getAnonymousNamespace(); 6285 } else { 6286 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6287 PrevNS = ND->getAnonymousNamespace(); 6288 } 6289 6290 if (PrevNS && IsInline != PrevNS->isInline()) 6291 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6292 &IsInline, PrevNS); 6293 } 6294 6295 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6296 StartLoc, Loc, II, PrevNS); 6297 if (IsInvalid) 6298 Namespc->setInvalidDecl(); 6299 6300 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6301 6302 // FIXME: Should we be merging attributes? 6303 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6304 PushNamespaceVisibilityAttr(Attr, Loc); 6305 6306 if (IsStd) 6307 StdNamespace = Namespc; 6308 if (AddToKnown) 6309 KnownNamespaces[Namespc] = false; 6310 6311 if (II) { 6312 PushOnScopeChains(Namespc, DeclRegionScope); 6313 } else { 6314 // Link the anonymous namespace into its parent. 6315 DeclContext *Parent = CurContext->getRedeclContext(); 6316 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6317 TU->setAnonymousNamespace(Namespc); 6318 } else { 6319 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6320 } 6321 6322 CurContext->addDecl(Namespc); 6323 6324 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6325 // behaves as if it were replaced by 6326 // namespace unique { /* empty body */ } 6327 // using namespace unique; 6328 // namespace unique { namespace-body } 6329 // where all occurrences of 'unique' in a translation unit are 6330 // replaced by the same identifier and this identifier differs 6331 // from all other identifiers in the entire program. 6332 6333 // We just create the namespace with an empty name and then add an 6334 // implicit using declaration, just like the standard suggests. 6335 // 6336 // CodeGen enforces the "universally unique" aspect by giving all 6337 // declarations semantically contained within an anonymous 6338 // namespace internal linkage. 6339 6340 if (!PrevNS) { 6341 UsingDirectiveDecl* UD 6342 = UsingDirectiveDecl::Create(Context, Parent, 6343 /* 'using' */ LBrace, 6344 /* 'namespace' */ SourceLocation(), 6345 /* qualifier */ NestedNameSpecifierLoc(), 6346 /* identifier */ SourceLocation(), 6347 Namespc, 6348 /* Ancestor */ Parent); 6349 UD->setImplicit(); 6350 Parent->addDecl(UD); 6351 } 6352 } 6353 6354 ActOnDocumentableDecl(Namespc); 6355 6356 // Although we could have an invalid decl (i.e. the namespace name is a 6357 // redefinition), push it as current DeclContext and try to continue parsing. 6358 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6359 // for the namespace has the declarations that showed up in that particular 6360 // namespace definition. 6361 PushDeclContext(NamespcScope, Namespc); 6362 return Namespc; 6363} 6364 6365/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6366/// is a namespace alias, returns the namespace it points to. 6367static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6368 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6369 return AD->getNamespace(); 6370 return dyn_cast_or_null<NamespaceDecl>(D); 6371} 6372 6373/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6374/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6375void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6376 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6377 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6378 Namespc->setRBraceLoc(RBrace); 6379 PopDeclContext(); 6380 if (Namespc->hasAttr<VisibilityAttr>()) 6381 PopPragmaVisibility(true, RBrace); 6382} 6383 6384CXXRecordDecl *Sema::getStdBadAlloc() const { 6385 return cast_or_null<CXXRecordDecl>( 6386 StdBadAlloc.get(Context.getExternalSource())); 6387} 6388 6389NamespaceDecl *Sema::getStdNamespace() const { 6390 return cast_or_null<NamespaceDecl>( 6391 StdNamespace.get(Context.getExternalSource())); 6392} 6393 6394/// \brief Retrieve the special "std" namespace, which may require us to 6395/// implicitly define the namespace. 6396NamespaceDecl *Sema::getOrCreateStdNamespace() { 6397 if (!StdNamespace) { 6398 // The "std" namespace has not yet been defined, so build one implicitly. 6399 StdNamespace = NamespaceDecl::Create(Context, 6400 Context.getTranslationUnitDecl(), 6401 /*Inline=*/false, 6402 SourceLocation(), SourceLocation(), 6403 &PP.getIdentifierTable().get("std"), 6404 /*PrevDecl=*/0); 6405 getStdNamespace()->setImplicit(true); 6406 } 6407 6408 return getStdNamespace(); 6409} 6410 6411bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6412 assert(getLangOpts().CPlusPlus && 6413 "Looking for std::initializer_list outside of C++."); 6414 6415 // We're looking for implicit instantiations of 6416 // template <typename E> class std::initializer_list. 6417 6418 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6419 return false; 6420 6421 ClassTemplateDecl *Template = 0; 6422 const TemplateArgument *Arguments = 0; 6423 6424 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6425 6426 ClassTemplateSpecializationDecl *Specialization = 6427 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6428 if (!Specialization) 6429 return false; 6430 6431 Template = Specialization->getSpecializedTemplate(); 6432 Arguments = Specialization->getTemplateArgs().data(); 6433 } else if (const TemplateSpecializationType *TST = 6434 Ty->getAs<TemplateSpecializationType>()) { 6435 Template = dyn_cast_or_null<ClassTemplateDecl>( 6436 TST->getTemplateName().getAsTemplateDecl()); 6437 Arguments = TST->getArgs(); 6438 } 6439 if (!Template) 6440 return false; 6441 6442 if (!StdInitializerList) { 6443 // Haven't recognized std::initializer_list yet, maybe this is it. 6444 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6445 if (TemplateClass->getIdentifier() != 6446 &PP.getIdentifierTable().get("initializer_list") || 6447 !getStdNamespace()->InEnclosingNamespaceSetOf( 6448 TemplateClass->getDeclContext())) 6449 return false; 6450 // This is a template called std::initializer_list, but is it the right 6451 // template? 6452 TemplateParameterList *Params = Template->getTemplateParameters(); 6453 if (Params->getMinRequiredArguments() != 1) 6454 return false; 6455 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6456 return false; 6457 6458 // It's the right template. 6459 StdInitializerList = Template; 6460 } 6461 6462 if (Template != StdInitializerList) 6463 return false; 6464 6465 // This is an instance of std::initializer_list. Find the argument type. 6466 if (Element) 6467 *Element = Arguments[0].getAsType(); 6468 return true; 6469} 6470 6471static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6472 NamespaceDecl *Std = S.getStdNamespace(); 6473 if (!Std) { 6474 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6475 return 0; 6476 } 6477 6478 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6479 Loc, Sema::LookupOrdinaryName); 6480 if (!S.LookupQualifiedName(Result, Std)) { 6481 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6482 return 0; 6483 } 6484 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6485 if (!Template) { 6486 Result.suppressDiagnostics(); 6487 // We found something weird. Complain about the first thing we found. 6488 NamedDecl *Found = *Result.begin(); 6489 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6490 return 0; 6491 } 6492 6493 // We found some template called std::initializer_list. Now verify that it's 6494 // correct. 6495 TemplateParameterList *Params = Template->getTemplateParameters(); 6496 if (Params->getMinRequiredArguments() != 1 || 6497 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6498 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6499 return 0; 6500 } 6501 6502 return Template; 6503} 6504 6505QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6506 if (!StdInitializerList) { 6507 StdInitializerList = LookupStdInitializerList(*this, Loc); 6508 if (!StdInitializerList) 6509 return QualType(); 6510 } 6511 6512 TemplateArgumentListInfo Args(Loc, Loc); 6513 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6514 Context.getTrivialTypeSourceInfo(Element, 6515 Loc))); 6516 return Context.getCanonicalType( 6517 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6518} 6519 6520bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6521 // C++ [dcl.init.list]p2: 6522 // A constructor is an initializer-list constructor if its first parameter 6523 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6524 // std::initializer_list<E> for some type E, and either there are no other 6525 // parameters or else all other parameters have default arguments. 6526 if (Ctor->getNumParams() < 1 || 6527 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6528 return false; 6529 6530 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6531 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6532 ArgType = RT->getPointeeType().getUnqualifiedType(); 6533 6534 return isStdInitializerList(ArgType, 0); 6535} 6536 6537/// \brief Determine whether a using statement is in a context where it will be 6538/// apply in all contexts. 6539static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6540 switch (CurContext->getDeclKind()) { 6541 case Decl::TranslationUnit: 6542 return true; 6543 case Decl::LinkageSpec: 6544 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6545 default: 6546 return false; 6547 } 6548} 6549 6550namespace { 6551 6552// Callback to only accept typo corrections that are namespaces. 6553class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6554 public: 6555 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6556 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6557 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6558 } 6559 return false; 6560 } 6561}; 6562 6563} 6564 6565static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6566 CXXScopeSpec &SS, 6567 SourceLocation IdentLoc, 6568 IdentifierInfo *Ident) { 6569 NamespaceValidatorCCC Validator; 6570 R.clear(); 6571 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6572 R.getLookupKind(), Sc, &SS, 6573 Validator)) { 6574 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6575 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6576 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6577 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6578 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6579 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6580 CorrectedStr); 6581 else 6582 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6583 << Ident << CorrectedQuotedStr 6584 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6585 6586 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6587 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6588 6589 R.addDecl(Corrected.getCorrectionDecl()); 6590 return true; 6591 } 6592 return false; 6593} 6594 6595Decl *Sema::ActOnUsingDirective(Scope *S, 6596 SourceLocation UsingLoc, 6597 SourceLocation NamespcLoc, 6598 CXXScopeSpec &SS, 6599 SourceLocation IdentLoc, 6600 IdentifierInfo *NamespcName, 6601 AttributeList *AttrList) { 6602 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6603 assert(NamespcName && "Invalid NamespcName."); 6604 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6605 6606 // This can only happen along a recovery path. 6607 while (S->getFlags() & Scope::TemplateParamScope) 6608 S = S->getParent(); 6609 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6610 6611 UsingDirectiveDecl *UDir = 0; 6612 NestedNameSpecifier *Qualifier = 0; 6613 if (SS.isSet()) 6614 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6615 6616 // Lookup namespace name. 6617 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6618 LookupParsedName(R, S, &SS); 6619 if (R.isAmbiguous()) 6620 return 0; 6621 6622 if (R.empty()) { 6623 R.clear(); 6624 // Allow "using namespace std;" or "using namespace ::std;" even if 6625 // "std" hasn't been defined yet, for GCC compatibility. 6626 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6627 NamespcName->isStr("std")) { 6628 Diag(IdentLoc, diag::ext_using_undefined_std); 6629 R.addDecl(getOrCreateStdNamespace()); 6630 R.resolveKind(); 6631 } 6632 // Otherwise, attempt typo correction. 6633 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6634 } 6635 6636 if (!R.empty()) { 6637 NamedDecl *Named = R.getFoundDecl(); 6638 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6639 && "expected namespace decl"); 6640 // C++ [namespace.udir]p1: 6641 // A using-directive specifies that the names in the nominated 6642 // namespace can be used in the scope in which the 6643 // using-directive appears after the using-directive. During 6644 // unqualified name lookup (3.4.1), the names appear as if they 6645 // were declared in the nearest enclosing namespace which 6646 // contains both the using-directive and the nominated 6647 // namespace. [Note: in this context, "contains" means "contains 6648 // directly or indirectly". ] 6649 6650 // Find enclosing context containing both using-directive and 6651 // nominated namespace. 6652 NamespaceDecl *NS = getNamespaceDecl(Named); 6653 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6654 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6655 CommonAncestor = CommonAncestor->getParent(); 6656 6657 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6658 SS.getWithLocInContext(Context), 6659 IdentLoc, Named, CommonAncestor); 6660 6661 if (IsUsingDirectiveInToplevelContext(CurContext) && 6662 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6663 Diag(IdentLoc, diag::warn_using_directive_in_header); 6664 } 6665 6666 PushUsingDirective(S, UDir); 6667 } else { 6668 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6669 } 6670 6671 if (UDir) 6672 ProcessDeclAttributeList(S, UDir, AttrList); 6673 6674 return UDir; 6675} 6676 6677void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6678 // If the scope has an associated entity and the using directive is at 6679 // namespace or translation unit scope, add the UsingDirectiveDecl into 6680 // its lookup structure so qualified name lookup can find it. 6681 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6682 if (Ctx && !Ctx->isFunctionOrMethod()) 6683 Ctx->addDecl(UDir); 6684 else 6685 // Otherwise, it is at block sope. The using-directives will affect lookup 6686 // only to the end of the scope. 6687 S->PushUsingDirective(UDir); 6688} 6689 6690 6691Decl *Sema::ActOnUsingDeclaration(Scope *S, 6692 AccessSpecifier AS, 6693 bool HasUsingKeyword, 6694 SourceLocation UsingLoc, 6695 CXXScopeSpec &SS, 6696 UnqualifiedId &Name, 6697 AttributeList *AttrList, 6698 bool IsTypeName, 6699 SourceLocation TypenameLoc) { 6700 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6701 6702 switch (Name.getKind()) { 6703 case UnqualifiedId::IK_ImplicitSelfParam: 6704 case UnqualifiedId::IK_Identifier: 6705 case UnqualifiedId::IK_OperatorFunctionId: 6706 case UnqualifiedId::IK_LiteralOperatorId: 6707 case UnqualifiedId::IK_ConversionFunctionId: 6708 break; 6709 6710 case UnqualifiedId::IK_ConstructorName: 6711 case UnqualifiedId::IK_ConstructorTemplateId: 6712 // C++11 inheriting constructors. 6713 Diag(Name.getLocStart(), 6714 getLangOpts().CPlusPlus11 ? 6715 diag::warn_cxx98_compat_using_decl_constructor : 6716 diag::err_using_decl_constructor) 6717 << SS.getRange(); 6718 6719 if (getLangOpts().CPlusPlus11) break; 6720 6721 return 0; 6722 6723 case UnqualifiedId::IK_DestructorName: 6724 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6725 << SS.getRange(); 6726 return 0; 6727 6728 case UnqualifiedId::IK_TemplateId: 6729 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6730 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6731 return 0; 6732 } 6733 6734 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6735 DeclarationName TargetName = TargetNameInfo.getName(); 6736 if (!TargetName) 6737 return 0; 6738 6739 // Warn about access declarations. 6740 // TODO: store that the declaration was written without 'using' and 6741 // talk about access decls instead of using decls in the 6742 // diagnostics. 6743 if (!HasUsingKeyword) { 6744 UsingLoc = Name.getLocStart(); 6745 6746 Diag(UsingLoc, 6747 getLangOpts().CPlusPlus11 ? diag::err_access_decl 6748 : diag::warn_access_decl_deprecated) 6749 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6750 } 6751 6752 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6753 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6754 return 0; 6755 6756 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6757 TargetNameInfo, AttrList, 6758 /* IsInstantiation */ false, 6759 IsTypeName, TypenameLoc); 6760 if (UD) 6761 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6762 6763 return UD; 6764} 6765 6766/// \brief Determine whether a using declaration considers the given 6767/// declarations as "equivalent", e.g., if they are redeclarations of 6768/// the same entity or are both typedefs of the same type. 6769static bool 6770IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6771 bool &SuppressRedeclaration) { 6772 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6773 SuppressRedeclaration = false; 6774 return true; 6775 } 6776 6777 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6778 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6779 SuppressRedeclaration = true; 6780 return Context.hasSameType(TD1->getUnderlyingType(), 6781 TD2->getUnderlyingType()); 6782 } 6783 6784 return false; 6785} 6786 6787 6788/// Determines whether to create a using shadow decl for a particular 6789/// decl, given the set of decls existing prior to this using lookup. 6790bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6791 const LookupResult &Previous) { 6792 // Diagnose finding a decl which is not from a base class of the 6793 // current class. We do this now because there are cases where this 6794 // function will silently decide not to build a shadow decl, which 6795 // will pre-empt further diagnostics. 6796 // 6797 // We don't need to do this in C++0x because we do the check once on 6798 // the qualifier. 6799 // 6800 // FIXME: diagnose the following if we care enough: 6801 // struct A { int foo; }; 6802 // struct B : A { using A::foo; }; 6803 // template <class T> struct C : A {}; 6804 // template <class T> struct D : C<T> { using B::foo; } // <--- 6805 // This is invalid (during instantiation) in C++03 because B::foo 6806 // resolves to the using decl in B, which is not a base class of D<T>. 6807 // We can't diagnose it immediately because C<T> is an unknown 6808 // specialization. The UsingShadowDecl in D<T> then points directly 6809 // to A::foo, which will look well-formed when we instantiate. 6810 // The right solution is to not collapse the shadow-decl chain. 6811 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6812 DeclContext *OrigDC = Orig->getDeclContext(); 6813 6814 // Handle enums and anonymous structs. 6815 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6816 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6817 while (OrigRec->isAnonymousStructOrUnion()) 6818 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6819 6820 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6821 if (OrigDC == CurContext) { 6822 Diag(Using->getLocation(), 6823 diag::err_using_decl_nested_name_specifier_is_current_class) 6824 << Using->getQualifierLoc().getSourceRange(); 6825 Diag(Orig->getLocation(), diag::note_using_decl_target); 6826 return true; 6827 } 6828 6829 Diag(Using->getQualifierLoc().getBeginLoc(), 6830 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6831 << Using->getQualifier() 6832 << cast<CXXRecordDecl>(CurContext) 6833 << Using->getQualifierLoc().getSourceRange(); 6834 Diag(Orig->getLocation(), diag::note_using_decl_target); 6835 return true; 6836 } 6837 } 6838 6839 if (Previous.empty()) return false; 6840 6841 NamedDecl *Target = Orig; 6842 if (isa<UsingShadowDecl>(Target)) 6843 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6844 6845 // If the target happens to be one of the previous declarations, we 6846 // don't have a conflict. 6847 // 6848 // FIXME: but we might be increasing its access, in which case we 6849 // should redeclare it. 6850 NamedDecl *NonTag = 0, *Tag = 0; 6851 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6852 I != E; ++I) { 6853 NamedDecl *D = (*I)->getUnderlyingDecl(); 6854 bool Result; 6855 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6856 return Result; 6857 6858 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6859 } 6860 6861 if (Target->isFunctionOrFunctionTemplate()) { 6862 FunctionDecl *FD; 6863 if (isa<FunctionTemplateDecl>(Target)) 6864 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6865 else 6866 FD = cast<FunctionDecl>(Target); 6867 6868 NamedDecl *OldDecl = 0; 6869 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6870 case Ovl_Overload: 6871 return false; 6872 6873 case Ovl_NonFunction: 6874 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6875 break; 6876 6877 // We found a decl with the exact signature. 6878 case Ovl_Match: 6879 // If we're in a record, we want to hide the target, so we 6880 // return true (without a diagnostic) to tell the caller not to 6881 // build a shadow decl. 6882 if (CurContext->isRecord()) 6883 return true; 6884 6885 // If we're not in a record, this is an error. 6886 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6887 break; 6888 } 6889 6890 Diag(Target->getLocation(), diag::note_using_decl_target); 6891 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6892 return true; 6893 } 6894 6895 // Target is not a function. 6896 6897 if (isa<TagDecl>(Target)) { 6898 // No conflict between a tag and a non-tag. 6899 if (!Tag) return false; 6900 6901 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6902 Diag(Target->getLocation(), diag::note_using_decl_target); 6903 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6904 return true; 6905 } 6906 6907 // No conflict between a tag and a non-tag. 6908 if (!NonTag) return false; 6909 6910 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6911 Diag(Target->getLocation(), diag::note_using_decl_target); 6912 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6913 return true; 6914} 6915 6916/// Builds a shadow declaration corresponding to a 'using' declaration. 6917UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6918 UsingDecl *UD, 6919 NamedDecl *Orig) { 6920 6921 // If we resolved to another shadow declaration, just coalesce them. 6922 NamedDecl *Target = Orig; 6923 if (isa<UsingShadowDecl>(Target)) { 6924 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6925 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6926 } 6927 6928 UsingShadowDecl *Shadow 6929 = UsingShadowDecl::Create(Context, CurContext, 6930 UD->getLocation(), UD, Target); 6931 UD->addShadowDecl(Shadow); 6932 6933 Shadow->setAccess(UD->getAccess()); 6934 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6935 Shadow->setInvalidDecl(); 6936 6937 if (S) 6938 PushOnScopeChains(Shadow, S); 6939 else 6940 CurContext->addDecl(Shadow); 6941 6942 6943 return Shadow; 6944} 6945 6946/// Hides a using shadow declaration. This is required by the current 6947/// using-decl implementation when a resolvable using declaration in a 6948/// class is followed by a declaration which would hide or override 6949/// one or more of the using decl's targets; for example: 6950/// 6951/// struct Base { void foo(int); }; 6952/// struct Derived : Base { 6953/// using Base::foo; 6954/// void foo(int); 6955/// }; 6956/// 6957/// The governing language is C++03 [namespace.udecl]p12: 6958/// 6959/// When a using-declaration brings names from a base class into a 6960/// derived class scope, member functions in the derived class 6961/// override and/or hide member functions with the same name and 6962/// parameter types in a base class (rather than conflicting). 6963/// 6964/// There are two ways to implement this: 6965/// (1) optimistically create shadow decls when they're not hidden 6966/// by existing declarations, or 6967/// (2) don't create any shadow decls (or at least don't make them 6968/// visible) until we've fully parsed/instantiated the class. 6969/// The problem with (1) is that we might have to retroactively remove 6970/// a shadow decl, which requires several O(n) operations because the 6971/// decl structures are (very reasonably) not designed for removal. 6972/// (2) avoids this but is very fiddly and phase-dependent. 6973void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6974 if (Shadow->getDeclName().getNameKind() == 6975 DeclarationName::CXXConversionFunctionName) 6976 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6977 6978 // Remove it from the DeclContext... 6979 Shadow->getDeclContext()->removeDecl(Shadow); 6980 6981 // ...and the scope, if applicable... 6982 if (S) { 6983 S->RemoveDecl(Shadow); 6984 IdResolver.RemoveDecl(Shadow); 6985 } 6986 6987 // ...and the using decl. 6988 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6989 6990 // TODO: complain somehow if Shadow was used. It shouldn't 6991 // be possible for this to happen, because...? 6992} 6993 6994/// Builds a using declaration. 6995/// 6996/// \param IsInstantiation - Whether this call arises from an 6997/// instantiation of an unresolved using declaration. We treat 6998/// the lookup differently for these declarations. 6999NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 7000 SourceLocation UsingLoc, 7001 CXXScopeSpec &SS, 7002 const DeclarationNameInfo &NameInfo, 7003 AttributeList *AttrList, 7004 bool IsInstantiation, 7005 bool IsTypeName, 7006 SourceLocation TypenameLoc) { 7007 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 7008 SourceLocation IdentLoc = NameInfo.getLoc(); 7009 assert(IdentLoc.isValid() && "Invalid TargetName location."); 7010 7011 // FIXME: We ignore attributes for now. 7012 7013 if (SS.isEmpty()) { 7014 Diag(IdentLoc, diag::err_using_requires_qualname); 7015 return 0; 7016 } 7017 7018 // Do the redeclaration lookup in the current scope. 7019 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 7020 ForRedeclaration); 7021 Previous.setHideTags(false); 7022 if (S) { 7023 LookupName(Previous, S); 7024 7025 // It is really dumb that we have to do this. 7026 LookupResult::Filter F = Previous.makeFilter(); 7027 while (F.hasNext()) { 7028 NamedDecl *D = F.next(); 7029 if (!isDeclInScope(D, CurContext, S)) 7030 F.erase(); 7031 } 7032 F.done(); 7033 } else { 7034 assert(IsInstantiation && "no scope in non-instantiation"); 7035 assert(CurContext->isRecord() && "scope not record in instantiation"); 7036 LookupQualifiedName(Previous, CurContext); 7037 } 7038 7039 // Check for invalid redeclarations. 7040 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 7041 return 0; 7042 7043 // Check for bad qualifiers. 7044 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 7045 return 0; 7046 7047 DeclContext *LookupContext = computeDeclContext(SS); 7048 NamedDecl *D; 7049 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 7050 if (!LookupContext) { 7051 if (IsTypeName) { 7052 // FIXME: not all declaration name kinds are legal here 7053 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 7054 UsingLoc, TypenameLoc, 7055 QualifierLoc, 7056 IdentLoc, NameInfo.getName()); 7057 } else { 7058 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 7059 QualifierLoc, NameInfo); 7060 } 7061 } else { 7062 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 7063 NameInfo, IsTypeName); 7064 } 7065 D->setAccess(AS); 7066 CurContext->addDecl(D); 7067 7068 if (!LookupContext) return D; 7069 UsingDecl *UD = cast<UsingDecl>(D); 7070 7071 if (RequireCompleteDeclContext(SS, LookupContext)) { 7072 UD->setInvalidDecl(); 7073 return UD; 7074 } 7075 7076 // The normal rules do not apply to inheriting constructor declarations. 7077 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 7078 if (CheckInheritingConstructorUsingDecl(UD)) 7079 UD->setInvalidDecl(); 7080 return UD; 7081 } 7082 7083 // Otherwise, look up the target name. 7084 7085 LookupResult R(*this, NameInfo, LookupOrdinaryName); 7086 7087 // Unlike most lookups, we don't always want to hide tag 7088 // declarations: tag names are visible through the using declaration 7089 // even if hidden by ordinary names, *except* in a dependent context 7090 // where it's important for the sanity of two-phase lookup. 7091 if (!IsInstantiation) 7092 R.setHideTags(false); 7093 7094 // For the purposes of this lookup, we have a base object type 7095 // equal to that of the current context. 7096 if (CurContext->isRecord()) { 7097 R.setBaseObjectType( 7098 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 7099 } 7100 7101 LookupQualifiedName(R, LookupContext); 7102 7103 if (R.empty()) { 7104 Diag(IdentLoc, diag::err_no_member) 7105 << NameInfo.getName() << LookupContext << SS.getRange(); 7106 UD->setInvalidDecl(); 7107 return UD; 7108 } 7109 7110 if (R.isAmbiguous()) { 7111 UD->setInvalidDecl(); 7112 return UD; 7113 } 7114 7115 if (IsTypeName) { 7116 // If we asked for a typename and got a non-type decl, error out. 7117 if (!R.getAsSingle<TypeDecl>()) { 7118 Diag(IdentLoc, diag::err_using_typename_non_type); 7119 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 7120 Diag((*I)->getUnderlyingDecl()->getLocation(), 7121 diag::note_using_decl_target); 7122 UD->setInvalidDecl(); 7123 return UD; 7124 } 7125 } else { 7126 // If we asked for a non-typename and we got a type, error out, 7127 // but only if this is an instantiation of an unresolved using 7128 // decl. Otherwise just silently find the type name. 7129 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 7130 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 7131 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 7132 UD->setInvalidDecl(); 7133 return UD; 7134 } 7135 } 7136 7137 // C++0x N2914 [namespace.udecl]p6: 7138 // A using-declaration shall not name a namespace. 7139 if (R.getAsSingle<NamespaceDecl>()) { 7140 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 7141 << SS.getRange(); 7142 UD->setInvalidDecl(); 7143 return UD; 7144 } 7145 7146 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7147 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7148 BuildUsingShadowDecl(S, UD, *I); 7149 } 7150 7151 return UD; 7152} 7153 7154/// Additional checks for a using declaration referring to a constructor name. 7155bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7156 assert(!UD->isTypeName() && "expecting a constructor name"); 7157 7158 const Type *SourceType = UD->getQualifier()->getAsType(); 7159 assert(SourceType && 7160 "Using decl naming constructor doesn't have type in scope spec."); 7161 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7162 7163 // Check whether the named type is a direct base class. 7164 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7165 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7166 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7167 BaseIt != BaseE; ++BaseIt) { 7168 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7169 if (CanonicalSourceType == BaseType) 7170 break; 7171 if (BaseIt->getType()->isDependentType()) 7172 break; 7173 } 7174 7175 if (BaseIt == BaseE) { 7176 // Did not find SourceType in the bases. 7177 Diag(UD->getUsingLocation(), 7178 diag::err_using_decl_constructor_not_in_direct_base) 7179 << UD->getNameInfo().getSourceRange() 7180 << QualType(SourceType, 0) << TargetClass; 7181 return true; 7182 } 7183 7184 if (!CurContext->isDependentContext()) 7185 BaseIt->setInheritConstructors(); 7186 7187 return false; 7188} 7189 7190/// Checks that the given using declaration is not an invalid 7191/// redeclaration. Note that this is checking only for the using decl 7192/// itself, not for any ill-formedness among the UsingShadowDecls. 7193bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7194 bool isTypeName, 7195 const CXXScopeSpec &SS, 7196 SourceLocation NameLoc, 7197 const LookupResult &Prev) { 7198 // C++03 [namespace.udecl]p8: 7199 // C++0x [namespace.udecl]p10: 7200 // A using-declaration is a declaration and can therefore be used 7201 // repeatedly where (and only where) multiple declarations are 7202 // allowed. 7203 // 7204 // That's in non-member contexts. 7205 if (!CurContext->getRedeclContext()->isRecord()) 7206 return false; 7207 7208 NestedNameSpecifier *Qual 7209 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7210 7211 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7212 NamedDecl *D = *I; 7213 7214 bool DTypename; 7215 NestedNameSpecifier *DQual; 7216 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7217 DTypename = UD->isTypeName(); 7218 DQual = UD->getQualifier(); 7219 } else if (UnresolvedUsingValueDecl *UD 7220 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7221 DTypename = false; 7222 DQual = UD->getQualifier(); 7223 } else if (UnresolvedUsingTypenameDecl *UD 7224 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7225 DTypename = true; 7226 DQual = UD->getQualifier(); 7227 } else continue; 7228 7229 // using decls differ if one says 'typename' and the other doesn't. 7230 // FIXME: non-dependent using decls? 7231 if (isTypeName != DTypename) continue; 7232 7233 // using decls differ if they name different scopes (but note that 7234 // template instantiation can cause this check to trigger when it 7235 // didn't before instantiation). 7236 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7237 Context.getCanonicalNestedNameSpecifier(DQual)) 7238 continue; 7239 7240 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7241 Diag(D->getLocation(), diag::note_using_decl) << 1; 7242 return true; 7243 } 7244 7245 return false; 7246} 7247 7248 7249/// Checks that the given nested-name qualifier used in a using decl 7250/// in the current context is appropriately related to the current 7251/// scope. If an error is found, diagnoses it and returns true. 7252bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7253 const CXXScopeSpec &SS, 7254 SourceLocation NameLoc) { 7255 DeclContext *NamedContext = computeDeclContext(SS); 7256 7257 if (!CurContext->isRecord()) { 7258 // C++03 [namespace.udecl]p3: 7259 // C++0x [namespace.udecl]p8: 7260 // A using-declaration for a class member shall be a member-declaration. 7261 7262 // If we weren't able to compute a valid scope, it must be a 7263 // dependent class scope. 7264 if (!NamedContext || NamedContext->isRecord()) { 7265 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7266 << SS.getRange(); 7267 return true; 7268 } 7269 7270 // Otherwise, everything is known to be fine. 7271 return false; 7272 } 7273 7274 // The current scope is a record. 7275 7276 // If the named context is dependent, we can't decide much. 7277 if (!NamedContext) { 7278 // FIXME: in C++0x, we can diagnose if we can prove that the 7279 // nested-name-specifier does not refer to a base class, which is 7280 // still possible in some cases. 7281 7282 // Otherwise we have to conservatively report that things might be 7283 // okay. 7284 return false; 7285 } 7286 7287 if (!NamedContext->isRecord()) { 7288 // Ideally this would point at the last name in the specifier, 7289 // but we don't have that level of source info. 7290 Diag(SS.getRange().getBegin(), 7291 diag::err_using_decl_nested_name_specifier_is_not_class) 7292 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7293 return true; 7294 } 7295 7296 if (!NamedContext->isDependentContext() && 7297 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7298 return true; 7299 7300 if (getLangOpts().CPlusPlus11) { 7301 // C++0x [namespace.udecl]p3: 7302 // In a using-declaration used as a member-declaration, the 7303 // nested-name-specifier shall name a base class of the class 7304 // being defined. 7305 7306 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7307 cast<CXXRecordDecl>(NamedContext))) { 7308 if (CurContext == NamedContext) { 7309 Diag(NameLoc, 7310 diag::err_using_decl_nested_name_specifier_is_current_class) 7311 << SS.getRange(); 7312 return true; 7313 } 7314 7315 Diag(SS.getRange().getBegin(), 7316 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7317 << (NestedNameSpecifier*) SS.getScopeRep() 7318 << cast<CXXRecordDecl>(CurContext) 7319 << SS.getRange(); 7320 return true; 7321 } 7322 7323 return false; 7324 } 7325 7326 // C++03 [namespace.udecl]p4: 7327 // A using-declaration used as a member-declaration shall refer 7328 // to a member of a base class of the class being defined [etc.]. 7329 7330 // Salient point: SS doesn't have to name a base class as long as 7331 // lookup only finds members from base classes. Therefore we can 7332 // diagnose here only if we can prove that that can't happen, 7333 // i.e. if the class hierarchies provably don't intersect. 7334 7335 // TODO: it would be nice if "definitely valid" results were cached 7336 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7337 // need to be repeated. 7338 7339 struct UserData { 7340 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7341 7342 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7343 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7344 Data->Bases.insert(Base); 7345 return true; 7346 } 7347 7348 bool hasDependentBases(const CXXRecordDecl *Class) { 7349 return !Class->forallBases(collect, this); 7350 } 7351 7352 /// Returns true if the base is dependent or is one of the 7353 /// accumulated base classes. 7354 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7355 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7356 return !Data->Bases.count(Base); 7357 } 7358 7359 bool mightShareBases(const CXXRecordDecl *Class) { 7360 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7361 } 7362 }; 7363 7364 UserData Data; 7365 7366 // Returns false if we find a dependent base. 7367 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7368 return false; 7369 7370 // Returns false if the class has a dependent base or if it or one 7371 // of its bases is present in the base set of the current context. 7372 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7373 return false; 7374 7375 Diag(SS.getRange().getBegin(), 7376 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7377 << (NestedNameSpecifier*) SS.getScopeRep() 7378 << cast<CXXRecordDecl>(CurContext) 7379 << SS.getRange(); 7380 7381 return true; 7382} 7383 7384Decl *Sema::ActOnAliasDeclaration(Scope *S, 7385 AccessSpecifier AS, 7386 MultiTemplateParamsArg TemplateParamLists, 7387 SourceLocation UsingLoc, 7388 UnqualifiedId &Name, 7389 AttributeList *AttrList, 7390 TypeResult Type) { 7391 // Skip up to the relevant declaration scope. 7392 while (S->getFlags() & Scope::TemplateParamScope) 7393 S = S->getParent(); 7394 assert((S->getFlags() & Scope::DeclScope) && 7395 "got alias-declaration outside of declaration scope"); 7396 7397 if (Type.isInvalid()) 7398 return 0; 7399 7400 bool Invalid = false; 7401 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7402 TypeSourceInfo *TInfo = 0; 7403 GetTypeFromParser(Type.get(), &TInfo); 7404 7405 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7406 return 0; 7407 7408 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7409 UPPC_DeclarationType)) { 7410 Invalid = true; 7411 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7412 TInfo->getTypeLoc().getBeginLoc()); 7413 } 7414 7415 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7416 LookupName(Previous, S); 7417 7418 // Warn about shadowing the name of a template parameter. 7419 if (Previous.isSingleResult() && 7420 Previous.getFoundDecl()->isTemplateParameter()) { 7421 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7422 Previous.clear(); 7423 } 7424 7425 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7426 "name in alias declaration must be an identifier"); 7427 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7428 Name.StartLocation, 7429 Name.Identifier, TInfo); 7430 7431 NewTD->setAccess(AS); 7432 7433 if (Invalid) 7434 NewTD->setInvalidDecl(); 7435 7436 ProcessDeclAttributeList(S, NewTD, AttrList); 7437 7438 CheckTypedefForVariablyModifiedType(S, NewTD); 7439 Invalid |= NewTD->isInvalidDecl(); 7440 7441 bool Redeclaration = false; 7442 7443 NamedDecl *NewND; 7444 if (TemplateParamLists.size()) { 7445 TypeAliasTemplateDecl *OldDecl = 0; 7446 TemplateParameterList *OldTemplateParams = 0; 7447 7448 if (TemplateParamLists.size() != 1) { 7449 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7450 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7451 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7452 } 7453 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7454 7455 // Only consider previous declarations in the same scope. 7456 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7457 /*ExplicitInstantiationOrSpecialization*/false); 7458 if (!Previous.empty()) { 7459 Redeclaration = true; 7460 7461 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7462 if (!OldDecl && !Invalid) { 7463 Diag(UsingLoc, diag::err_redefinition_different_kind) 7464 << Name.Identifier; 7465 7466 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7467 if (OldD->getLocation().isValid()) 7468 Diag(OldD->getLocation(), diag::note_previous_definition); 7469 7470 Invalid = true; 7471 } 7472 7473 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7474 if (TemplateParameterListsAreEqual(TemplateParams, 7475 OldDecl->getTemplateParameters(), 7476 /*Complain=*/true, 7477 TPL_TemplateMatch)) 7478 OldTemplateParams = OldDecl->getTemplateParameters(); 7479 else 7480 Invalid = true; 7481 7482 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7483 if (!Invalid && 7484 !Context.hasSameType(OldTD->getUnderlyingType(), 7485 NewTD->getUnderlyingType())) { 7486 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7487 // but we can't reasonably accept it. 7488 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7489 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7490 if (OldTD->getLocation().isValid()) 7491 Diag(OldTD->getLocation(), diag::note_previous_definition); 7492 Invalid = true; 7493 } 7494 } 7495 } 7496 7497 // Merge any previous default template arguments into our parameters, 7498 // and check the parameter list. 7499 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7500 TPC_TypeAliasTemplate)) 7501 return 0; 7502 7503 TypeAliasTemplateDecl *NewDecl = 7504 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7505 Name.Identifier, TemplateParams, 7506 NewTD); 7507 7508 NewDecl->setAccess(AS); 7509 7510 if (Invalid) 7511 NewDecl->setInvalidDecl(); 7512 else if (OldDecl) 7513 NewDecl->setPreviousDeclaration(OldDecl); 7514 7515 NewND = NewDecl; 7516 } else { 7517 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7518 NewND = NewTD; 7519 } 7520 7521 if (!Redeclaration) 7522 PushOnScopeChains(NewND, S); 7523 7524 ActOnDocumentableDecl(NewND); 7525 return NewND; 7526} 7527 7528Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7529 SourceLocation NamespaceLoc, 7530 SourceLocation AliasLoc, 7531 IdentifierInfo *Alias, 7532 CXXScopeSpec &SS, 7533 SourceLocation IdentLoc, 7534 IdentifierInfo *Ident) { 7535 7536 // Lookup the namespace name. 7537 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7538 LookupParsedName(R, S, &SS); 7539 7540 // Check if we have a previous declaration with the same name. 7541 NamedDecl *PrevDecl 7542 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7543 ForRedeclaration); 7544 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7545 PrevDecl = 0; 7546 7547 if (PrevDecl) { 7548 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7549 // We already have an alias with the same name that points to the same 7550 // namespace, so don't create a new one. 7551 // FIXME: At some point, we'll want to create the (redundant) 7552 // declaration to maintain better source information. 7553 if (!R.isAmbiguous() && !R.empty() && 7554 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7555 return 0; 7556 } 7557 7558 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7559 diag::err_redefinition_different_kind; 7560 Diag(AliasLoc, DiagID) << Alias; 7561 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7562 return 0; 7563 } 7564 7565 if (R.isAmbiguous()) 7566 return 0; 7567 7568 if (R.empty()) { 7569 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7570 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7571 return 0; 7572 } 7573 } 7574 7575 NamespaceAliasDecl *AliasDecl = 7576 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7577 Alias, SS.getWithLocInContext(Context), 7578 IdentLoc, R.getFoundDecl()); 7579 7580 PushOnScopeChains(AliasDecl, S); 7581 return AliasDecl; 7582} 7583 7584Sema::ImplicitExceptionSpecification 7585Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7586 CXXMethodDecl *MD) { 7587 CXXRecordDecl *ClassDecl = MD->getParent(); 7588 7589 // C++ [except.spec]p14: 7590 // An implicitly declared special member function (Clause 12) shall have an 7591 // exception-specification. [...] 7592 ImplicitExceptionSpecification ExceptSpec(*this); 7593 if (ClassDecl->isInvalidDecl()) 7594 return ExceptSpec; 7595 7596 // Direct base-class constructors. 7597 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7598 BEnd = ClassDecl->bases_end(); 7599 B != BEnd; ++B) { 7600 if (B->isVirtual()) // Handled below. 7601 continue; 7602 7603 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7604 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7605 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7606 // If this is a deleted function, add it anyway. This might be conformant 7607 // with the standard. This might not. I'm not sure. It might not matter. 7608 if (Constructor) 7609 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7610 } 7611 } 7612 7613 // Virtual base-class constructors. 7614 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7615 BEnd = ClassDecl->vbases_end(); 7616 B != BEnd; ++B) { 7617 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7618 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7619 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7620 // If this is a deleted function, add it anyway. This might be conformant 7621 // with the standard. This might not. I'm not sure. It might not matter. 7622 if (Constructor) 7623 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7624 } 7625 } 7626 7627 // Field constructors. 7628 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7629 FEnd = ClassDecl->field_end(); 7630 F != FEnd; ++F) { 7631 if (F->hasInClassInitializer()) { 7632 if (Expr *E = F->getInClassInitializer()) 7633 ExceptSpec.CalledExpr(E); 7634 else if (!F->isInvalidDecl()) 7635 // DR1351: 7636 // If the brace-or-equal-initializer of a non-static data member 7637 // invokes a defaulted default constructor of its class or of an 7638 // enclosing class in a potentially evaluated subexpression, the 7639 // program is ill-formed. 7640 // 7641 // This resolution is unworkable: the exception specification of the 7642 // default constructor can be needed in an unevaluated context, in 7643 // particular, in the operand of a noexcept-expression, and we can be 7644 // unable to compute an exception specification for an enclosed class. 7645 // 7646 // We do not allow an in-class initializer to require the evaluation 7647 // of the exception specification for any in-class initializer whose 7648 // definition is not lexically complete. 7649 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7650 } else if (const RecordType *RecordTy 7651 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7652 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7653 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7654 // If this is a deleted function, add it anyway. This might be conformant 7655 // with the standard. This might not. I'm not sure. It might not matter. 7656 // In particular, the problem is that this function never gets called. It 7657 // might just be ill-formed because this function attempts to refer to 7658 // a deleted function here. 7659 if (Constructor) 7660 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7661 } 7662 } 7663 7664 return ExceptSpec; 7665} 7666 7667Sema::ImplicitExceptionSpecification 7668Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7669 CXXRecordDecl *ClassDecl = CD->getParent(); 7670 7671 // C++ [except.spec]p14: 7672 // An inheriting constructor [...] shall have an exception-specification. [...] 7673 ImplicitExceptionSpecification ExceptSpec(*this); 7674 if (ClassDecl->isInvalidDecl()) 7675 return ExceptSpec; 7676 7677 // Inherited constructor. 7678 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7679 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7680 // FIXME: Copying or moving the parameters could add extra exceptions to the 7681 // set, as could the default arguments for the inherited constructor. This 7682 // will be addressed when we implement the resolution of core issue 1351. 7683 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7684 7685 // Direct base-class constructors. 7686 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7687 BEnd = ClassDecl->bases_end(); 7688 B != BEnd; ++B) { 7689 if (B->isVirtual()) // Handled below. 7690 continue; 7691 7692 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7693 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7694 if (BaseClassDecl == InheritedDecl) 7695 continue; 7696 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7697 if (Constructor) 7698 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7699 } 7700 } 7701 7702 // Virtual base-class constructors. 7703 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7704 BEnd = ClassDecl->vbases_end(); 7705 B != BEnd; ++B) { 7706 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7707 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7708 if (BaseClassDecl == InheritedDecl) 7709 continue; 7710 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7711 if (Constructor) 7712 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7713 } 7714 } 7715 7716 // Field constructors. 7717 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7718 FEnd = ClassDecl->field_end(); 7719 F != FEnd; ++F) { 7720 if (F->hasInClassInitializer()) { 7721 if (Expr *E = F->getInClassInitializer()) 7722 ExceptSpec.CalledExpr(E); 7723 else if (!F->isInvalidDecl()) 7724 Diag(CD->getLocation(), 7725 diag::err_in_class_initializer_references_def_ctor) << CD; 7726 } else if (const RecordType *RecordTy 7727 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7728 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7729 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7730 if (Constructor) 7731 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7732 } 7733 } 7734 7735 return ExceptSpec; 7736} 7737 7738namespace { 7739/// RAII object to register a special member as being currently declared. 7740struct DeclaringSpecialMember { 7741 Sema &S; 7742 Sema::SpecialMemberDecl D; 7743 bool WasAlreadyBeingDeclared; 7744 7745 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7746 : S(S), D(RD, CSM) { 7747 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7748 if (WasAlreadyBeingDeclared) 7749 // This almost never happens, but if it does, ensure that our cache 7750 // doesn't contain a stale result. 7751 S.SpecialMemberCache.clear(); 7752 7753 // FIXME: Register a note to be produced if we encounter an error while 7754 // declaring the special member. 7755 } 7756 ~DeclaringSpecialMember() { 7757 if (!WasAlreadyBeingDeclared) 7758 S.SpecialMembersBeingDeclared.erase(D); 7759 } 7760 7761 /// \brief Are we already trying to declare this special member? 7762 bool isAlreadyBeingDeclared() const { 7763 return WasAlreadyBeingDeclared; 7764 } 7765}; 7766} 7767 7768CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7769 CXXRecordDecl *ClassDecl) { 7770 // C++ [class.ctor]p5: 7771 // A default constructor for a class X is a constructor of class X 7772 // that can be called without an argument. If there is no 7773 // user-declared constructor for class X, a default constructor is 7774 // implicitly declared. An implicitly-declared default constructor 7775 // is an inline public member of its class. 7776 assert(ClassDecl->needsImplicitDefaultConstructor() && 7777 "Should not build implicit default constructor!"); 7778 7779 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7780 if (DSM.isAlreadyBeingDeclared()) 7781 return 0; 7782 7783 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7784 CXXDefaultConstructor, 7785 false); 7786 7787 // Create the actual constructor declaration. 7788 CanQualType ClassType 7789 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7790 SourceLocation ClassLoc = ClassDecl->getLocation(); 7791 DeclarationName Name 7792 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7793 DeclarationNameInfo NameInfo(Name, ClassLoc); 7794 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7795 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7796 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7797 Constexpr); 7798 DefaultCon->setAccess(AS_public); 7799 DefaultCon->setDefaulted(); 7800 DefaultCon->setImplicit(); 7801 7802 // Build an exception specification pointing back at this constructor. 7803 FunctionProtoType::ExtProtoInfo EPI; 7804 EPI.ExceptionSpecType = EST_Unevaluated; 7805 EPI.ExceptionSpecDecl = DefaultCon; 7806 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 7807 7808 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7809 // constructors is easy to compute. 7810 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7811 7812 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7813 SetDeclDeleted(DefaultCon, ClassLoc); 7814 7815 // Note that we have declared this constructor. 7816 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7817 7818 if (Scope *S = getScopeForContext(ClassDecl)) 7819 PushOnScopeChains(DefaultCon, S, false); 7820 ClassDecl->addDecl(DefaultCon); 7821 7822 return DefaultCon; 7823} 7824 7825void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7826 CXXConstructorDecl *Constructor) { 7827 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7828 !Constructor->doesThisDeclarationHaveABody() && 7829 !Constructor->isDeleted()) && 7830 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7831 7832 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7833 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7834 7835 SynthesizedFunctionScope Scope(*this, Constructor); 7836 DiagnosticErrorTrap Trap(Diags); 7837 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7838 Trap.hasErrorOccurred()) { 7839 Diag(CurrentLocation, diag::note_member_synthesized_at) 7840 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7841 Constructor->setInvalidDecl(); 7842 return; 7843 } 7844 7845 SourceLocation Loc = Constructor->getLocation(); 7846 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7847 7848 Constructor->setUsed(); 7849 MarkVTableUsed(CurrentLocation, ClassDecl); 7850 7851 if (ASTMutationListener *L = getASTMutationListener()) { 7852 L->CompletedImplicitDefinition(Constructor); 7853 } 7854} 7855 7856void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7857 // Check that any explicitly-defaulted methods have exception specifications 7858 // compatible with their implicit exception specifications. 7859 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7860} 7861 7862namespace { 7863/// Information on inheriting constructors to declare. 7864class InheritingConstructorInfo { 7865public: 7866 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 7867 : SemaRef(SemaRef), Derived(Derived) { 7868 // Mark the constructors that we already have in the derived class. 7869 // 7870 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7871 // unless there is a user-declared constructor with the same signature in 7872 // the class where the using-declaration appears. 7873 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 7874 } 7875 7876 void inheritAll(CXXRecordDecl *RD) { 7877 visitAll(RD, &InheritingConstructorInfo::inherit); 7878 } 7879 7880private: 7881 /// Information about an inheriting constructor. 7882 struct InheritingConstructor { 7883 InheritingConstructor() 7884 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 7885 7886 /// If \c true, a constructor with this signature is already declared 7887 /// in the derived class. 7888 bool DeclaredInDerived; 7889 7890 /// The constructor which is inherited. 7891 const CXXConstructorDecl *BaseCtor; 7892 7893 /// The derived constructor we declared. 7894 CXXConstructorDecl *DerivedCtor; 7895 }; 7896 7897 /// Inheriting constructors with a given canonical type. There can be at 7898 /// most one such non-template constructor, and any number of templated 7899 /// constructors. 7900 struct InheritingConstructorsForType { 7901 InheritingConstructor NonTemplate; 7902 llvm::SmallVector< 7903 std::pair<TemplateParameterList*, InheritingConstructor>, 4> Templates; 7904 7905 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 7906 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 7907 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 7908 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 7909 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 7910 false, S.TPL_TemplateMatch)) 7911 return Templates[I].second; 7912 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 7913 return Templates.back().second; 7914 } 7915 7916 return NonTemplate; 7917 } 7918 }; 7919 7920 /// Get or create the inheriting constructor record for a constructor. 7921 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 7922 QualType CtorType) { 7923 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 7924 .getEntry(SemaRef, Ctor); 7925 } 7926 7927 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 7928 7929 /// Process all constructors for a class. 7930 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 7931 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 7932 CtorE = RD->ctor_end(); 7933 CtorIt != CtorE; ++CtorIt) 7934 (this->*Callback)(*CtorIt); 7935 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 7936 I(RD->decls_begin()), E(RD->decls_end()); 7937 I != E; ++I) { 7938 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 7939 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 7940 (this->*Callback)(CD); 7941 } 7942 } 7943 7944 /// Note that a constructor (or constructor template) was declared in Derived. 7945 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 7946 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 7947 } 7948 7949 /// Inherit a single constructor. 7950 void inherit(const CXXConstructorDecl *Ctor) { 7951 const FunctionProtoType *CtorType = 7952 Ctor->getType()->castAs<FunctionProtoType>(); 7953 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 7954 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 7955 7956 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 7957 7958 // Core issue (no number yet): the ellipsis is always discarded. 7959 if (EPI.Variadic) { 7960 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 7961 SemaRef.Diag(Ctor->getLocation(), 7962 diag::note_using_decl_constructor_ellipsis); 7963 EPI.Variadic = false; 7964 } 7965 7966 // Declare a constructor for each number of parameters. 7967 // 7968 // C++11 [class.inhctor]p1: 7969 // The candidate set of inherited constructors from the class X named in 7970 // the using-declaration consists of [... modulo defects ...] for each 7971 // constructor or constructor template of X, the set of constructors or 7972 // constructor templates that results from omitting any ellipsis parameter 7973 // specification and successively omitting parameters with a default 7974 // argument from the end of the parameter-type-list 7975 unsigned MinParams = minParamsToInherit(Ctor); 7976 unsigned Params = Ctor->getNumParams(); 7977 if (Params >= MinParams) { 7978 do 7979 declareCtor(UsingLoc, Ctor, 7980 SemaRef.Context.getFunctionType( 7981 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 7982 while (Params > MinParams && 7983 Ctor->getParamDecl(--Params)->hasDefaultArg()); 7984 } 7985 } 7986 7987 /// Find the using-declaration which specified that we should inherit the 7988 /// constructors of \p Base. 7989 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 7990 // No fancy lookup required; just look for the base constructor name 7991 // directly within the derived class. 7992 ASTContext &Context = SemaRef.Context; 7993 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 7994 Context.getCanonicalType(Context.getRecordType(Base))); 7995 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 7996 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 7997 } 7998 7999 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 8000 // C++11 [class.inhctor]p3: 8001 // [F]or each constructor template in the candidate set of inherited 8002 // constructors, a constructor template is implicitly declared 8003 if (Ctor->getDescribedFunctionTemplate()) 8004 return 0; 8005 8006 // For each non-template constructor in the candidate set of inherited 8007 // constructors other than a constructor having no parameters or a 8008 // copy/move constructor having a single parameter, a constructor is 8009 // implicitly declared [...] 8010 if (Ctor->getNumParams() == 0) 8011 return 1; 8012 if (Ctor->isCopyOrMoveConstructor()) 8013 return 2; 8014 8015 // Per discussion on core reflector, never inherit a constructor which 8016 // would become a default, copy, or move constructor of Derived either. 8017 const ParmVarDecl *PD = Ctor->getParamDecl(0); 8018 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 8019 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 8020 } 8021 8022 /// Declare a single inheriting constructor, inheriting the specified 8023 /// constructor, with the given type. 8024 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 8025 QualType DerivedType) { 8026 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 8027 8028 // C++11 [class.inhctor]p3: 8029 // ... a constructor is implicitly declared with the same constructor 8030 // characteristics unless there is a user-declared constructor with 8031 // the same signature in the class where the using-declaration appears 8032 if (Entry.DeclaredInDerived) 8033 return; 8034 8035 // C++11 [class.inhctor]p7: 8036 // If two using-declarations declare inheriting constructors with the 8037 // same signature, the program is ill-formed 8038 if (Entry.DerivedCtor) { 8039 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 8040 // Only diagnose this once per constructor. 8041 if (Entry.DerivedCtor->isInvalidDecl()) 8042 return; 8043 Entry.DerivedCtor->setInvalidDecl(); 8044 8045 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 8046 SemaRef.Diag(BaseCtor->getLocation(), 8047 diag::note_using_decl_constructor_conflict_current_ctor); 8048 SemaRef.Diag(Entry.BaseCtor->getLocation(), 8049 diag::note_using_decl_constructor_conflict_previous_ctor); 8050 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 8051 diag::note_using_decl_constructor_conflict_previous_using); 8052 } else { 8053 // Core issue (no number): if the same inheriting constructor is 8054 // produced by multiple base class constructors from the same base 8055 // class, the inheriting constructor is defined as deleted. 8056 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 8057 } 8058 8059 return; 8060 } 8061 8062 ASTContext &Context = SemaRef.Context; 8063 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 8064 Context.getCanonicalType(Context.getRecordType(Derived))); 8065 DeclarationNameInfo NameInfo(Name, UsingLoc); 8066 8067 TemplateParameterList *TemplateParams = 0; 8068 if (const FunctionTemplateDecl *FTD = 8069 BaseCtor->getDescribedFunctionTemplate()) { 8070 TemplateParams = FTD->getTemplateParameters(); 8071 // We're reusing template parameters from a different DeclContext. This 8072 // is questionable at best, but works out because the template depth in 8073 // both places is guaranteed to be 0. 8074 // FIXME: Rebuild the template parameters in the new context, and 8075 // transform the function type to refer to them. 8076 } 8077 8078 // Build type source info pointing at the using-declaration. This is 8079 // required by template instantiation. 8080 TypeSourceInfo *TInfo = 8081 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 8082 FunctionProtoTypeLoc ProtoLoc = 8083 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 8084 8085 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 8086 Context, Derived, UsingLoc, NameInfo, DerivedType, 8087 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 8088 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 8089 8090 // Build an unevaluated exception specification for this constructor. 8091 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 8092 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 8093 EPI.ExceptionSpecType = EST_Unevaluated; 8094 EPI.ExceptionSpecDecl = DerivedCtor; 8095 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 8096 FPT->getArgTypes(), EPI)); 8097 8098 // Build the parameter declarations. 8099 SmallVector<ParmVarDecl *, 16> ParamDecls; 8100 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 8101 TypeSourceInfo *TInfo = 8102 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 8103 ParmVarDecl *PD = ParmVarDecl::Create( 8104 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 8105 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 8106 PD->setScopeInfo(0, I); 8107 PD->setImplicit(); 8108 ParamDecls.push_back(PD); 8109 ProtoLoc.setArg(I, PD); 8110 } 8111 8112 // Set up the new constructor. 8113 DerivedCtor->setAccess(BaseCtor->getAccess()); 8114 DerivedCtor->setParams(ParamDecls); 8115 DerivedCtor->setInheritedConstructor(BaseCtor); 8116 if (BaseCtor->isDeleted()) 8117 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 8118 8119 // If this is a constructor template, build the template declaration. 8120 if (TemplateParams) { 8121 FunctionTemplateDecl *DerivedTemplate = 8122 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 8123 TemplateParams, DerivedCtor); 8124 DerivedTemplate->setAccess(BaseCtor->getAccess()); 8125 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 8126 Derived->addDecl(DerivedTemplate); 8127 } else { 8128 Derived->addDecl(DerivedCtor); 8129 } 8130 8131 Entry.BaseCtor = BaseCtor; 8132 Entry.DerivedCtor = DerivedCtor; 8133 } 8134 8135 Sema &SemaRef; 8136 CXXRecordDecl *Derived; 8137 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 8138 MapType Map; 8139}; 8140} 8141 8142void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 8143 // Defer declaring the inheriting constructors until the class is 8144 // instantiated. 8145 if (ClassDecl->isDependentContext()) 8146 return; 8147 8148 // Find base classes from which we might inherit constructors. 8149 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8150 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8151 BaseE = ClassDecl->bases_end(); 8152 BaseIt != BaseE; ++BaseIt) 8153 if (BaseIt->getInheritConstructors()) 8154 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8155 8156 // Go no further if we're not inheriting any constructors. 8157 if (InheritedBases.empty()) 8158 return; 8159 8160 // Declare the inherited constructors. 8161 InheritingConstructorInfo ICI(*this, ClassDecl); 8162 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8163 ICI.inheritAll(InheritedBases[I]); 8164} 8165 8166void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8167 CXXConstructorDecl *Constructor) { 8168 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8169 assert(Constructor->getInheritedConstructor() && 8170 !Constructor->doesThisDeclarationHaveABody() && 8171 !Constructor->isDeleted()); 8172 8173 SynthesizedFunctionScope Scope(*this, Constructor); 8174 DiagnosticErrorTrap Trap(Diags); 8175 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8176 Trap.hasErrorOccurred()) { 8177 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8178 << Context.getTagDeclType(ClassDecl); 8179 Constructor->setInvalidDecl(); 8180 return; 8181 } 8182 8183 SourceLocation Loc = Constructor->getLocation(); 8184 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8185 8186 Constructor->setUsed(); 8187 MarkVTableUsed(CurrentLocation, ClassDecl); 8188 8189 if (ASTMutationListener *L = getASTMutationListener()) { 8190 L->CompletedImplicitDefinition(Constructor); 8191 } 8192} 8193 8194 8195Sema::ImplicitExceptionSpecification 8196Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8197 CXXRecordDecl *ClassDecl = MD->getParent(); 8198 8199 // C++ [except.spec]p14: 8200 // An implicitly declared special member function (Clause 12) shall have 8201 // an exception-specification. 8202 ImplicitExceptionSpecification ExceptSpec(*this); 8203 if (ClassDecl->isInvalidDecl()) 8204 return ExceptSpec; 8205 8206 // Direct base-class destructors. 8207 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8208 BEnd = ClassDecl->bases_end(); 8209 B != BEnd; ++B) { 8210 if (B->isVirtual()) // Handled below. 8211 continue; 8212 8213 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8214 ExceptSpec.CalledDecl(B->getLocStart(), 8215 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8216 } 8217 8218 // Virtual base-class destructors. 8219 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8220 BEnd = ClassDecl->vbases_end(); 8221 B != BEnd; ++B) { 8222 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8223 ExceptSpec.CalledDecl(B->getLocStart(), 8224 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8225 } 8226 8227 // Field destructors. 8228 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8229 FEnd = ClassDecl->field_end(); 8230 F != FEnd; ++F) { 8231 if (const RecordType *RecordTy 8232 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8233 ExceptSpec.CalledDecl(F->getLocation(), 8234 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8235 } 8236 8237 return ExceptSpec; 8238} 8239 8240CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8241 // C++ [class.dtor]p2: 8242 // If a class has no user-declared destructor, a destructor is 8243 // declared implicitly. An implicitly-declared destructor is an 8244 // inline public member of its class. 8245 assert(ClassDecl->needsImplicitDestructor()); 8246 8247 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8248 if (DSM.isAlreadyBeingDeclared()) 8249 return 0; 8250 8251 // Create the actual destructor declaration. 8252 CanQualType ClassType 8253 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8254 SourceLocation ClassLoc = ClassDecl->getLocation(); 8255 DeclarationName Name 8256 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8257 DeclarationNameInfo NameInfo(Name, ClassLoc); 8258 CXXDestructorDecl *Destructor 8259 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8260 QualType(), 0, /*isInline=*/true, 8261 /*isImplicitlyDeclared=*/true); 8262 Destructor->setAccess(AS_public); 8263 Destructor->setDefaulted(); 8264 Destructor->setImplicit(); 8265 8266 // Build an exception specification pointing back at this destructor. 8267 FunctionProtoType::ExtProtoInfo EPI; 8268 EPI.ExceptionSpecType = EST_Unevaluated; 8269 EPI.ExceptionSpecDecl = Destructor; 8270 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8271 8272 AddOverriddenMethods(ClassDecl, Destructor); 8273 8274 // We don't need to use SpecialMemberIsTrivial here; triviality for 8275 // destructors is easy to compute. 8276 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8277 8278 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8279 SetDeclDeleted(Destructor, ClassLoc); 8280 8281 // Note that we have declared this destructor. 8282 ++ASTContext::NumImplicitDestructorsDeclared; 8283 8284 // Introduce this destructor into its scope. 8285 if (Scope *S = getScopeForContext(ClassDecl)) 8286 PushOnScopeChains(Destructor, S, false); 8287 ClassDecl->addDecl(Destructor); 8288 8289 return Destructor; 8290} 8291 8292void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8293 CXXDestructorDecl *Destructor) { 8294 assert((Destructor->isDefaulted() && 8295 !Destructor->doesThisDeclarationHaveABody() && 8296 !Destructor->isDeleted()) && 8297 "DefineImplicitDestructor - call it for implicit default dtor"); 8298 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8299 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8300 8301 if (Destructor->isInvalidDecl()) 8302 return; 8303 8304 SynthesizedFunctionScope Scope(*this, Destructor); 8305 8306 DiagnosticErrorTrap Trap(Diags); 8307 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8308 Destructor->getParent()); 8309 8310 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8311 Diag(CurrentLocation, diag::note_member_synthesized_at) 8312 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8313 8314 Destructor->setInvalidDecl(); 8315 return; 8316 } 8317 8318 SourceLocation Loc = Destructor->getLocation(); 8319 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8320 Destructor->setImplicitlyDefined(true); 8321 Destructor->setUsed(); 8322 MarkVTableUsed(CurrentLocation, ClassDecl); 8323 8324 if (ASTMutationListener *L = getASTMutationListener()) { 8325 L->CompletedImplicitDefinition(Destructor); 8326 } 8327} 8328 8329/// \brief Perform any semantic analysis which needs to be delayed until all 8330/// pending class member declarations have been parsed. 8331void Sema::ActOnFinishCXXMemberDecls() { 8332 // If the context is an invalid C++ class, just suppress these checks. 8333 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8334 if (Record->isInvalidDecl()) { 8335 DelayedDestructorExceptionSpecChecks.clear(); 8336 return; 8337 } 8338 } 8339 8340 // Perform any deferred checking of exception specifications for virtual 8341 // destructors. 8342 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8343 i != e; ++i) { 8344 const CXXDestructorDecl *Dtor = 8345 DelayedDestructorExceptionSpecChecks[i].first; 8346 assert(!Dtor->getParent()->isDependentType() && 8347 "Should not ever add destructors of templates into the list."); 8348 CheckOverridingFunctionExceptionSpec(Dtor, 8349 DelayedDestructorExceptionSpecChecks[i].second); 8350 } 8351 DelayedDestructorExceptionSpecChecks.clear(); 8352} 8353 8354void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8355 CXXDestructorDecl *Destructor) { 8356 assert(getLangOpts().CPlusPlus11 && 8357 "adjusting dtor exception specs was introduced in c++11"); 8358 8359 // C++11 [class.dtor]p3: 8360 // A declaration of a destructor that does not have an exception- 8361 // specification is implicitly considered to have the same exception- 8362 // specification as an implicit declaration. 8363 const FunctionProtoType *DtorType = Destructor->getType()-> 8364 getAs<FunctionProtoType>(); 8365 if (DtorType->hasExceptionSpec()) 8366 return; 8367 8368 // Replace the destructor's type, building off the existing one. Fortunately, 8369 // the only thing of interest in the destructor type is its extended info. 8370 // The return and arguments are fixed. 8371 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8372 EPI.ExceptionSpecType = EST_Unevaluated; 8373 EPI.ExceptionSpecDecl = Destructor; 8374 Destructor->setType(Context.getFunctionType(Context.VoidTy, None, EPI)); 8375 8376 // FIXME: If the destructor has a body that could throw, and the newly created 8377 // spec doesn't allow exceptions, we should emit a warning, because this 8378 // change in behavior can break conforming C++03 programs at runtime. 8379 // However, we don't have a body or an exception specification yet, so it 8380 // needs to be done somewhere else. 8381} 8382 8383/// When generating a defaulted copy or move assignment operator, if a field 8384/// should be copied with __builtin_memcpy rather than via explicit assignments, 8385/// do so. This optimization only applies for arrays of scalars, and for arrays 8386/// of class type where the selected copy/move-assignment operator is trivial. 8387static StmtResult 8388buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8389 Expr *To, Expr *From) { 8390 // Compute the size of the memory buffer to be copied. 8391 QualType SizeType = S.Context.getSizeType(); 8392 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8393 S.Context.getTypeSizeInChars(T).getQuantity()); 8394 8395 // Take the address of the field references for "from" and "to". We 8396 // directly construct UnaryOperators here because semantic analysis 8397 // does not permit us to take the address of an xvalue. 8398 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8399 S.Context.getPointerType(From->getType()), 8400 VK_RValue, OK_Ordinary, Loc); 8401 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8402 S.Context.getPointerType(To->getType()), 8403 VK_RValue, OK_Ordinary, Loc); 8404 8405 const Type *E = T->getBaseElementTypeUnsafe(); 8406 bool NeedsCollectableMemCpy = 8407 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8408 8409 // Create a reference to the __builtin_objc_memmove_collectable function 8410 StringRef MemCpyName = NeedsCollectableMemCpy ? 8411 "__builtin_objc_memmove_collectable" : 8412 "__builtin_memcpy"; 8413 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8414 Sema::LookupOrdinaryName); 8415 S.LookupName(R, S.TUScope, true); 8416 8417 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8418 if (!MemCpy) 8419 // Something went horribly wrong earlier, and we will have complained 8420 // about it. 8421 return StmtError(); 8422 8423 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8424 VK_RValue, Loc, 0); 8425 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8426 8427 Expr *CallArgs[] = { 8428 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8429 }; 8430 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8431 Loc, CallArgs, Loc); 8432 8433 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8434 return S.Owned(Call.takeAs<Stmt>()); 8435} 8436 8437/// \brief Builds a statement that copies/moves the given entity from \p From to 8438/// \c To. 8439/// 8440/// This routine is used to copy/move the members of a class with an 8441/// implicitly-declared copy/move assignment operator. When the entities being 8442/// copied are arrays, this routine builds for loops to copy them. 8443/// 8444/// \param S The Sema object used for type-checking. 8445/// 8446/// \param Loc The location where the implicit copy/move is being generated. 8447/// 8448/// \param T The type of the expressions being copied/moved. Both expressions 8449/// must have this type. 8450/// 8451/// \param To The expression we are copying/moving to. 8452/// 8453/// \param From The expression we are copying/moving from. 8454/// 8455/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8456/// Otherwise, it's a non-static member subobject. 8457/// 8458/// \param Copying Whether we're copying or moving. 8459/// 8460/// \param Depth Internal parameter recording the depth of the recursion. 8461/// 8462/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8463/// if a memcpy should be used instead. 8464static StmtResult 8465buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8466 Expr *To, Expr *From, 8467 bool CopyingBaseSubobject, bool Copying, 8468 unsigned Depth = 0) { 8469 // C++11 [class.copy]p28: 8470 // Each subobject is assigned in the manner appropriate to its type: 8471 // 8472 // - if the subobject is of class type, as if by a call to operator= with 8473 // the subobject as the object expression and the corresponding 8474 // subobject of x as a single function argument (as if by explicit 8475 // qualification; that is, ignoring any possible virtual overriding 8476 // functions in more derived classes); 8477 // 8478 // C++03 [class.copy]p13: 8479 // - if the subobject is of class type, the copy assignment operator for 8480 // the class is used (as if by explicit qualification; that is, 8481 // ignoring any possible virtual overriding functions in more derived 8482 // classes); 8483 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8484 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8485 8486 // Look for operator=. 8487 DeclarationName Name 8488 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8489 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8490 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8491 8492 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8493 // operator. 8494 if (!S.getLangOpts().CPlusPlus11) { 8495 LookupResult::Filter F = OpLookup.makeFilter(); 8496 while (F.hasNext()) { 8497 NamedDecl *D = F.next(); 8498 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8499 if (Method->isCopyAssignmentOperator() || 8500 (!Copying && Method->isMoveAssignmentOperator())) 8501 continue; 8502 8503 F.erase(); 8504 } 8505 F.done(); 8506 } 8507 8508 // Suppress the protected check (C++ [class.protected]) for each of the 8509 // assignment operators we found. This strange dance is required when 8510 // we're assigning via a base classes's copy-assignment operator. To 8511 // ensure that we're getting the right base class subobject (without 8512 // ambiguities), we need to cast "this" to that subobject type; to 8513 // ensure that we don't go through the virtual call mechanism, we need 8514 // to qualify the operator= name with the base class (see below). However, 8515 // this means that if the base class has a protected copy assignment 8516 // operator, the protected member access check will fail. So, we 8517 // rewrite "protected" access to "public" access in this case, since we 8518 // know by construction that we're calling from a derived class. 8519 if (CopyingBaseSubobject) { 8520 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8521 L != LEnd; ++L) { 8522 if (L.getAccess() == AS_protected) 8523 L.setAccess(AS_public); 8524 } 8525 } 8526 8527 // Create the nested-name-specifier that will be used to qualify the 8528 // reference to operator=; this is required to suppress the virtual 8529 // call mechanism. 8530 CXXScopeSpec SS; 8531 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8532 SS.MakeTrivial(S.Context, 8533 NestedNameSpecifier::Create(S.Context, 0, false, 8534 CanonicalT), 8535 Loc); 8536 8537 // Create the reference to operator=. 8538 ExprResult OpEqualRef 8539 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8540 /*TemplateKWLoc=*/SourceLocation(), 8541 /*FirstQualifierInScope=*/0, 8542 OpLookup, 8543 /*TemplateArgs=*/0, 8544 /*SuppressQualifierCheck=*/true); 8545 if (OpEqualRef.isInvalid()) 8546 return StmtError(); 8547 8548 // Build the call to the assignment operator. 8549 8550 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8551 OpEqualRef.takeAs<Expr>(), 8552 Loc, From, Loc); 8553 if (Call.isInvalid()) 8554 return StmtError(); 8555 8556 // If we built a call to a trivial 'operator=' while copying an array, 8557 // bail out. We'll replace the whole shebang with a memcpy. 8558 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8559 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8560 return StmtResult((Stmt*)0); 8561 8562 // Convert to an expression-statement, and clean up any produced 8563 // temporaries. 8564 return S.ActOnExprStmt(Call); 8565 } 8566 8567 // - if the subobject is of scalar type, the built-in assignment 8568 // operator is used. 8569 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8570 if (!ArrayTy) { 8571 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8572 if (Assignment.isInvalid()) 8573 return StmtError(); 8574 return S.ActOnExprStmt(Assignment); 8575 } 8576 8577 // - if the subobject is an array, each element is assigned, in the 8578 // manner appropriate to the element type; 8579 8580 // Construct a loop over the array bounds, e.g., 8581 // 8582 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8583 // 8584 // that will copy each of the array elements. 8585 QualType SizeType = S.Context.getSizeType(); 8586 8587 // Create the iteration variable. 8588 IdentifierInfo *IterationVarName = 0; 8589 { 8590 SmallString<8> Str; 8591 llvm::raw_svector_ostream OS(Str); 8592 OS << "__i" << Depth; 8593 IterationVarName = &S.Context.Idents.get(OS.str()); 8594 } 8595 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8596 IterationVarName, SizeType, 8597 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8598 SC_None); 8599 8600 // Initialize the iteration variable to zero. 8601 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8602 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8603 8604 // Create a reference to the iteration variable; we'll use this several 8605 // times throughout. 8606 Expr *IterationVarRef 8607 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8608 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8609 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8610 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8611 8612 // Create the DeclStmt that holds the iteration variable. 8613 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8614 8615 // Subscript the "from" and "to" expressions with the iteration variable. 8616 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8617 IterationVarRefRVal, 8618 Loc)); 8619 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8620 IterationVarRefRVal, 8621 Loc)); 8622 if (!Copying) // Cast to rvalue 8623 From = CastForMoving(S, From); 8624 8625 // Build the copy/move for an individual element of the array. 8626 StmtResult Copy = 8627 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8628 To, From, CopyingBaseSubobject, 8629 Copying, Depth + 1); 8630 // Bail out if copying fails or if we determined that we should use memcpy. 8631 if (Copy.isInvalid() || !Copy.get()) 8632 return Copy; 8633 8634 // Create the comparison against the array bound. 8635 llvm::APInt Upper 8636 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8637 Expr *Comparison 8638 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8639 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8640 BO_NE, S.Context.BoolTy, 8641 VK_RValue, OK_Ordinary, Loc, false); 8642 8643 // Create the pre-increment of the iteration variable. 8644 Expr *Increment 8645 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8646 VK_LValue, OK_Ordinary, Loc); 8647 8648 // Construct the loop that copies all elements of this array. 8649 return S.ActOnForStmt(Loc, Loc, InitStmt, 8650 S.MakeFullExpr(Comparison), 8651 0, S.MakeFullDiscardedValueExpr(Increment), 8652 Loc, Copy.take()); 8653} 8654 8655static StmtResult 8656buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8657 Expr *To, Expr *From, 8658 bool CopyingBaseSubobject, bool Copying) { 8659 // Maybe we should use a memcpy? 8660 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8661 T.isTriviallyCopyableType(S.Context)) 8662 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8663 8664 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8665 CopyingBaseSubobject, 8666 Copying, 0)); 8667 8668 // If we ended up picking a trivial assignment operator for an array of a 8669 // non-trivially-copyable class type, just emit a memcpy. 8670 if (!Result.isInvalid() && !Result.get()) 8671 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8672 8673 return Result; 8674} 8675 8676Sema::ImplicitExceptionSpecification 8677Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8678 CXXRecordDecl *ClassDecl = MD->getParent(); 8679 8680 ImplicitExceptionSpecification ExceptSpec(*this); 8681 if (ClassDecl->isInvalidDecl()) 8682 return ExceptSpec; 8683 8684 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8685 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8686 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8687 8688 // C++ [except.spec]p14: 8689 // An implicitly declared special member function (Clause 12) shall have an 8690 // exception-specification. [...] 8691 8692 // It is unspecified whether or not an implicit copy assignment operator 8693 // attempts to deduplicate calls to assignment operators of virtual bases are 8694 // made. As such, this exception specification is effectively unspecified. 8695 // Based on a similar decision made for constness in C++0x, we're erring on 8696 // the side of assuming such calls to be made regardless of whether they 8697 // actually happen. 8698 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8699 BaseEnd = ClassDecl->bases_end(); 8700 Base != BaseEnd; ++Base) { 8701 if (Base->isVirtual()) 8702 continue; 8703 8704 CXXRecordDecl *BaseClassDecl 8705 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8706 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8707 ArgQuals, false, 0)) 8708 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8709 } 8710 8711 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8712 BaseEnd = ClassDecl->vbases_end(); 8713 Base != BaseEnd; ++Base) { 8714 CXXRecordDecl *BaseClassDecl 8715 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8716 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8717 ArgQuals, false, 0)) 8718 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8719 } 8720 8721 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8722 FieldEnd = ClassDecl->field_end(); 8723 Field != FieldEnd; 8724 ++Field) { 8725 QualType FieldType = Context.getBaseElementType(Field->getType()); 8726 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8727 if (CXXMethodDecl *CopyAssign = 8728 LookupCopyingAssignment(FieldClassDecl, 8729 ArgQuals | FieldType.getCVRQualifiers(), 8730 false, 0)) 8731 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8732 } 8733 } 8734 8735 return ExceptSpec; 8736} 8737 8738CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8739 // Note: The following rules are largely analoguous to the copy 8740 // constructor rules. Note that virtual bases are not taken into account 8741 // for determining the argument type of the operator. Note also that 8742 // operators taking an object instead of a reference are allowed. 8743 assert(ClassDecl->needsImplicitCopyAssignment()); 8744 8745 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8746 if (DSM.isAlreadyBeingDeclared()) 8747 return 0; 8748 8749 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8750 QualType RetType = Context.getLValueReferenceType(ArgType); 8751 bool Const = ClassDecl->implicitCopyAssignmentHasConstParam(); 8752 if (Const) 8753 ArgType = ArgType.withConst(); 8754 ArgType = Context.getLValueReferenceType(ArgType); 8755 8756 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8757 CXXCopyAssignment, 8758 Const); 8759 8760 // An implicitly-declared copy assignment operator is an inline public 8761 // member of its class. 8762 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8763 SourceLocation ClassLoc = ClassDecl->getLocation(); 8764 DeclarationNameInfo NameInfo(Name, ClassLoc); 8765 CXXMethodDecl *CopyAssignment = 8766 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8767 /*TInfo=*/ 0, /*StorageClass=*/ SC_None, 8768 /*isInline=*/ true, Constexpr, SourceLocation()); 8769 CopyAssignment->setAccess(AS_public); 8770 CopyAssignment->setDefaulted(); 8771 CopyAssignment->setImplicit(); 8772 8773 // Build an exception specification pointing back at this member. 8774 FunctionProtoType::ExtProtoInfo EPI; 8775 EPI.ExceptionSpecType = EST_Unevaluated; 8776 EPI.ExceptionSpecDecl = CopyAssignment; 8777 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8778 8779 // Add the parameter to the operator. 8780 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8781 ClassLoc, ClassLoc, /*Id=*/0, 8782 ArgType, /*TInfo=*/0, 8783 SC_None, 0); 8784 CopyAssignment->setParams(FromParam); 8785 8786 AddOverriddenMethods(ClassDecl, CopyAssignment); 8787 8788 CopyAssignment->setTrivial( 8789 ClassDecl->needsOverloadResolutionForCopyAssignment() 8790 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8791 : ClassDecl->hasTrivialCopyAssignment()); 8792 8793 // C++11 [class.copy]p19: 8794 // .... If the class definition does not explicitly declare a copy 8795 // assignment operator, there is no user-declared move constructor, and 8796 // there is no user-declared move assignment operator, a copy assignment 8797 // operator is implicitly declared as defaulted. 8798 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8799 SetDeclDeleted(CopyAssignment, ClassLoc); 8800 8801 // Note that we have added this copy-assignment operator. 8802 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8803 8804 if (Scope *S = getScopeForContext(ClassDecl)) 8805 PushOnScopeChains(CopyAssignment, S, false); 8806 ClassDecl->addDecl(CopyAssignment); 8807 8808 return CopyAssignment; 8809} 8810 8811/// Diagnose an implicit copy operation for a class which is odr-used, but 8812/// which is deprecated because the class has a user-declared copy constructor, 8813/// copy assignment operator, or destructor. 8814static void diagnoseDeprecatedCopyOperation(Sema &S, CXXMethodDecl *CopyOp, 8815 SourceLocation UseLoc) { 8816 assert(CopyOp->isImplicit()); 8817 8818 CXXRecordDecl *RD = CopyOp->getParent(); 8819 CXXMethodDecl *UserDeclaredOperation = 0; 8820 8821 // In Microsoft mode, assignment operations don't affect constructors and 8822 // vice versa. 8823 if (RD->hasUserDeclaredDestructor()) { 8824 UserDeclaredOperation = RD->getDestructor(); 8825 } else if (!isa<CXXConstructorDecl>(CopyOp) && 8826 RD->hasUserDeclaredCopyConstructor() && 8827 !S.getLangOpts().MicrosoftMode) { 8828 // Find any user-declared copy constructor. 8829 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 8830 E = RD->ctor_end(); I != E; ++I) { 8831 if (I->isCopyConstructor()) { 8832 UserDeclaredOperation = *I; 8833 break; 8834 } 8835 } 8836 assert(UserDeclaredOperation); 8837 } else if (isa<CXXConstructorDecl>(CopyOp) && 8838 RD->hasUserDeclaredCopyAssignment() && 8839 !S.getLangOpts().MicrosoftMode) { 8840 // Find any user-declared move assignment operator. 8841 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 8842 E = RD->method_end(); I != E; ++I) { 8843 if (I->isCopyAssignmentOperator()) { 8844 UserDeclaredOperation = *I; 8845 break; 8846 } 8847 } 8848 assert(UserDeclaredOperation); 8849 } 8850 8851 if (UserDeclaredOperation) { 8852 S.Diag(UserDeclaredOperation->getLocation(), 8853 diag::warn_deprecated_copy_operation) 8854 << RD << /*copy assignment*/!isa<CXXConstructorDecl>(CopyOp) 8855 << /*destructor*/isa<CXXDestructorDecl>(UserDeclaredOperation); 8856 S.Diag(UseLoc, diag::note_member_synthesized_at) 8857 << (isa<CXXConstructorDecl>(CopyOp) ? Sema::CXXCopyConstructor 8858 : Sema::CXXCopyAssignment) 8859 << RD; 8860 } 8861} 8862 8863void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8864 CXXMethodDecl *CopyAssignOperator) { 8865 assert((CopyAssignOperator->isDefaulted() && 8866 CopyAssignOperator->isOverloadedOperator() && 8867 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8868 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8869 !CopyAssignOperator->isDeleted()) && 8870 "DefineImplicitCopyAssignment called for wrong function"); 8871 8872 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8873 8874 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8875 CopyAssignOperator->setInvalidDecl(); 8876 return; 8877 } 8878 8879 // C++11 [class.copy]p18: 8880 // The [definition of an implicitly declared copy assignment operator] is 8881 // deprecated if the class has a user-declared copy constructor or a 8882 // user-declared destructor. 8883 if (getLangOpts().CPlusPlus11 && CopyAssignOperator->isImplicit()) 8884 diagnoseDeprecatedCopyOperation(*this, CopyAssignOperator, CurrentLocation); 8885 8886 CopyAssignOperator->setUsed(); 8887 8888 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8889 DiagnosticErrorTrap Trap(Diags); 8890 8891 // C++0x [class.copy]p30: 8892 // The implicitly-defined or explicitly-defaulted copy assignment operator 8893 // for a non-union class X performs memberwise copy assignment of its 8894 // subobjects. The direct base classes of X are assigned first, in the 8895 // order of their declaration in the base-specifier-list, and then the 8896 // immediate non-static data members of X are assigned, in the order in 8897 // which they were declared in the class definition. 8898 8899 // The statements that form the synthesized function body. 8900 SmallVector<Stmt*, 8> Statements; 8901 8902 // The parameter for the "other" object, which we are copying from. 8903 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8904 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8905 QualType OtherRefType = Other->getType(); 8906 if (const LValueReferenceType *OtherRef 8907 = OtherRefType->getAs<LValueReferenceType>()) { 8908 OtherRefType = OtherRef->getPointeeType(); 8909 OtherQuals = OtherRefType.getQualifiers(); 8910 } 8911 8912 // Our location for everything implicitly-generated. 8913 SourceLocation Loc = CopyAssignOperator->getLocation(); 8914 8915 // Construct a reference to the "other" object. We'll be using this 8916 // throughout the generated ASTs. 8917 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8918 assert(OtherRef && "Reference to parameter cannot fail!"); 8919 8920 // Construct the "this" pointer. We'll be using this throughout the generated 8921 // ASTs. 8922 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8923 assert(This && "Reference to this cannot fail!"); 8924 8925 // Assign base classes. 8926 bool Invalid = false; 8927 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8928 E = ClassDecl->bases_end(); Base != E; ++Base) { 8929 // Form the assignment: 8930 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8931 QualType BaseType = Base->getType().getUnqualifiedType(); 8932 if (!BaseType->isRecordType()) { 8933 Invalid = true; 8934 continue; 8935 } 8936 8937 CXXCastPath BasePath; 8938 BasePath.push_back(Base); 8939 8940 // Construct the "from" expression, which is an implicit cast to the 8941 // appropriately-qualified base type. 8942 Expr *From = OtherRef; 8943 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8944 CK_UncheckedDerivedToBase, 8945 VK_LValue, &BasePath).take(); 8946 8947 // Dereference "this". 8948 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8949 8950 // Implicitly cast "this" to the appropriately-qualified base type. 8951 To = ImpCastExprToType(To.take(), 8952 Context.getCVRQualifiedType(BaseType, 8953 CopyAssignOperator->getTypeQualifiers()), 8954 CK_UncheckedDerivedToBase, 8955 VK_LValue, &BasePath); 8956 8957 // Build the copy. 8958 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8959 To.get(), From, 8960 /*CopyingBaseSubobject=*/true, 8961 /*Copying=*/true); 8962 if (Copy.isInvalid()) { 8963 Diag(CurrentLocation, diag::note_member_synthesized_at) 8964 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8965 CopyAssignOperator->setInvalidDecl(); 8966 return; 8967 } 8968 8969 // Success! Record the copy. 8970 Statements.push_back(Copy.takeAs<Expr>()); 8971 } 8972 8973 // Assign non-static members. 8974 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8975 FieldEnd = ClassDecl->field_end(); 8976 Field != FieldEnd; ++Field) { 8977 if (Field->isUnnamedBitfield()) 8978 continue; 8979 8980 if (Field->isInvalidDecl()) { 8981 Invalid = true; 8982 continue; 8983 } 8984 8985 // Check for members of reference type; we can't copy those. 8986 if (Field->getType()->isReferenceType()) { 8987 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8988 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8989 Diag(Field->getLocation(), diag::note_declared_at); 8990 Diag(CurrentLocation, diag::note_member_synthesized_at) 8991 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8992 Invalid = true; 8993 continue; 8994 } 8995 8996 // Check for members of const-qualified, non-class type. 8997 QualType BaseType = Context.getBaseElementType(Field->getType()); 8998 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8999 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9000 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9001 Diag(Field->getLocation(), diag::note_declared_at); 9002 Diag(CurrentLocation, diag::note_member_synthesized_at) 9003 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9004 Invalid = true; 9005 continue; 9006 } 9007 9008 // Suppress assigning zero-width bitfields. 9009 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9010 continue; 9011 9012 QualType FieldType = Field->getType().getNonReferenceType(); 9013 if (FieldType->isIncompleteArrayType()) { 9014 assert(ClassDecl->hasFlexibleArrayMember() && 9015 "Incomplete array type is not valid"); 9016 continue; 9017 } 9018 9019 // Build references to the field in the object we're copying from and to. 9020 CXXScopeSpec SS; // Intentionally empty 9021 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9022 LookupMemberName); 9023 MemberLookup.addDecl(*Field); 9024 MemberLookup.resolveKind(); 9025 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9026 Loc, /*IsArrow=*/false, 9027 SS, SourceLocation(), 0, 9028 MemberLookup, 0); 9029 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9030 Loc, /*IsArrow=*/true, 9031 SS, SourceLocation(), 0, 9032 MemberLookup, 0); 9033 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9034 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9035 9036 // Build the copy of this field. 9037 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 9038 To.get(), From.get(), 9039 /*CopyingBaseSubobject=*/false, 9040 /*Copying=*/true); 9041 if (Copy.isInvalid()) { 9042 Diag(CurrentLocation, diag::note_member_synthesized_at) 9043 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9044 CopyAssignOperator->setInvalidDecl(); 9045 return; 9046 } 9047 9048 // Success! Record the copy. 9049 Statements.push_back(Copy.takeAs<Stmt>()); 9050 } 9051 9052 if (!Invalid) { 9053 // Add a "return *this;" 9054 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9055 9056 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9057 if (Return.isInvalid()) 9058 Invalid = true; 9059 else { 9060 Statements.push_back(Return.takeAs<Stmt>()); 9061 9062 if (Trap.hasErrorOccurred()) { 9063 Diag(CurrentLocation, diag::note_member_synthesized_at) 9064 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 9065 Invalid = true; 9066 } 9067 } 9068 } 9069 9070 if (Invalid) { 9071 CopyAssignOperator->setInvalidDecl(); 9072 return; 9073 } 9074 9075 StmtResult Body; 9076 { 9077 CompoundScopeRAII CompoundScope(*this); 9078 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9079 /*isStmtExpr=*/false); 9080 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9081 } 9082 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 9083 9084 if (ASTMutationListener *L = getASTMutationListener()) { 9085 L->CompletedImplicitDefinition(CopyAssignOperator); 9086 } 9087} 9088 9089Sema::ImplicitExceptionSpecification 9090Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 9091 CXXRecordDecl *ClassDecl = MD->getParent(); 9092 9093 ImplicitExceptionSpecification ExceptSpec(*this); 9094 if (ClassDecl->isInvalidDecl()) 9095 return ExceptSpec; 9096 9097 // C++0x [except.spec]p14: 9098 // An implicitly declared special member function (Clause 12) shall have an 9099 // exception-specification. [...] 9100 9101 // It is unspecified whether or not an implicit move assignment operator 9102 // attempts to deduplicate calls to assignment operators of virtual bases are 9103 // made. As such, this exception specification is effectively unspecified. 9104 // Based on a similar decision made for constness in C++0x, we're erring on 9105 // the side of assuming such calls to be made regardless of whether they 9106 // actually happen. 9107 // Note that a move constructor is not implicitly declared when there are 9108 // virtual bases, but it can still be user-declared and explicitly defaulted. 9109 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9110 BaseEnd = ClassDecl->bases_end(); 9111 Base != BaseEnd; ++Base) { 9112 if (Base->isVirtual()) 9113 continue; 9114 9115 CXXRecordDecl *BaseClassDecl 9116 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9117 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9118 0, false, 0)) 9119 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9120 } 9121 9122 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9123 BaseEnd = ClassDecl->vbases_end(); 9124 Base != BaseEnd; ++Base) { 9125 CXXRecordDecl *BaseClassDecl 9126 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9127 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 9128 0, false, 0)) 9129 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 9130 } 9131 9132 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9133 FieldEnd = ClassDecl->field_end(); 9134 Field != FieldEnd; 9135 ++Field) { 9136 QualType FieldType = Context.getBaseElementType(Field->getType()); 9137 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9138 if (CXXMethodDecl *MoveAssign = 9139 LookupMovingAssignment(FieldClassDecl, 9140 FieldType.getCVRQualifiers(), 9141 false, 0)) 9142 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 9143 } 9144 } 9145 9146 return ExceptSpec; 9147} 9148 9149/// Determine whether the class type has any direct or indirect virtual base 9150/// classes which have a non-trivial move assignment operator. 9151static bool 9152hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 9153 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9154 BaseEnd = ClassDecl->vbases_end(); 9155 Base != BaseEnd; ++Base) { 9156 CXXRecordDecl *BaseClass = 9157 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9158 9159 // Try to declare the move assignment. If it would be deleted, then the 9160 // class does not have a non-trivial move assignment. 9161 if (BaseClass->needsImplicitMoveAssignment()) 9162 S.DeclareImplicitMoveAssignment(BaseClass); 9163 9164 if (BaseClass->hasNonTrivialMoveAssignment()) 9165 return true; 9166 } 9167 9168 return false; 9169} 9170 9171/// Determine whether the given type either has a move constructor or is 9172/// trivially copyable. 9173static bool 9174hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 9175 Type = S.Context.getBaseElementType(Type); 9176 9177 // FIXME: Technically, non-trivially-copyable non-class types, such as 9178 // reference types, are supposed to return false here, but that appears 9179 // to be a standard defect. 9180 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 9181 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 9182 return true; 9183 9184 if (Type.isTriviallyCopyableType(S.Context)) 9185 return true; 9186 9187 if (IsConstructor) { 9188 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 9189 // give the right answer. 9190 if (ClassDecl->needsImplicitMoveConstructor()) 9191 S.DeclareImplicitMoveConstructor(ClassDecl); 9192 return ClassDecl->hasMoveConstructor(); 9193 } 9194 9195 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 9196 // give the right answer. 9197 if (ClassDecl->needsImplicitMoveAssignment()) 9198 S.DeclareImplicitMoveAssignment(ClassDecl); 9199 return ClassDecl->hasMoveAssignment(); 9200} 9201 9202/// Determine whether all non-static data members and direct or virtual bases 9203/// of class \p ClassDecl have either a move operation, or are trivially 9204/// copyable. 9205static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 9206 bool IsConstructor) { 9207 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9208 BaseEnd = ClassDecl->bases_end(); 9209 Base != BaseEnd; ++Base) { 9210 if (Base->isVirtual()) 9211 continue; 9212 9213 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9214 return false; 9215 } 9216 9217 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9218 BaseEnd = ClassDecl->vbases_end(); 9219 Base != BaseEnd; ++Base) { 9220 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9221 return false; 9222 } 9223 9224 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9225 FieldEnd = ClassDecl->field_end(); 9226 Field != FieldEnd; ++Field) { 9227 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9228 return false; 9229 } 9230 9231 return true; 9232} 9233 9234CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9235 // C++11 [class.copy]p20: 9236 // If the definition of a class X does not explicitly declare a move 9237 // assignment operator, one will be implicitly declared as defaulted 9238 // if and only if: 9239 // 9240 // - [first 4 bullets] 9241 assert(ClassDecl->needsImplicitMoveAssignment()); 9242 9243 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9244 if (DSM.isAlreadyBeingDeclared()) 9245 return 0; 9246 9247 // [Checked after we build the declaration] 9248 // - the move assignment operator would not be implicitly defined as 9249 // deleted, 9250 9251 // [DR1402]: 9252 // - X has no direct or indirect virtual base class with a non-trivial 9253 // move assignment operator, and 9254 // - each of X's non-static data members and direct or virtual base classes 9255 // has a type that either has a move assignment operator or is trivially 9256 // copyable. 9257 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9258 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9259 ClassDecl->setFailedImplicitMoveAssignment(); 9260 return 0; 9261 } 9262 9263 // Note: The following rules are largely analoguous to the move 9264 // constructor rules. 9265 9266 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9267 QualType RetType = Context.getLValueReferenceType(ArgType); 9268 ArgType = Context.getRValueReferenceType(ArgType); 9269 9270 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9271 CXXMoveAssignment, 9272 false); 9273 9274 // An implicitly-declared move assignment operator is an inline public 9275 // member of its class. 9276 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9277 SourceLocation ClassLoc = ClassDecl->getLocation(); 9278 DeclarationNameInfo NameInfo(Name, ClassLoc); 9279 CXXMethodDecl *MoveAssignment = 9280 CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9281 /*TInfo=*/0, /*StorageClass=*/SC_None, 9282 /*isInline=*/true, Constexpr, SourceLocation()); 9283 MoveAssignment->setAccess(AS_public); 9284 MoveAssignment->setDefaulted(); 9285 MoveAssignment->setImplicit(); 9286 9287 // Build an exception specification pointing back at this member. 9288 FunctionProtoType::ExtProtoInfo EPI; 9289 EPI.ExceptionSpecType = EST_Unevaluated; 9290 EPI.ExceptionSpecDecl = MoveAssignment; 9291 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9292 9293 // Add the parameter to the operator. 9294 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9295 ClassLoc, ClassLoc, /*Id=*/0, 9296 ArgType, /*TInfo=*/0, 9297 SC_None, 0); 9298 MoveAssignment->setParams(FromParam); 9299 9300 AddOverriddenMethods(ClassDecl, MoveAssignment); 9301 9302 MoveAssignment->setTrivial( 9303 ClassDecl->needsOverloadResolutionForMoveAssignment() 9304 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9305 : ClassDecl->hasTrivialMoveAssignment()); 9306 9307 // C++0x [class.copy]p9: 9308 // If the definition of a class X does not explicitly declare a move 9309 // assignment operator, one will be implicitly declared as defaulted if and 9310 // only if: 9311 // [...] 9312 // - the move assignment operator would not be implicitly defined as 9313 // deleted. 9314 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9315 // Cache this result so that we don't try to generate this over and over 9316 // on every lookup, leaking memory and wasting time. 9317 ClassDecl->setFailedImplicitMoveAssignment(); 9318 return 0; 9319 } 9320 9321 // Note that we have added this copy-assignment operator. 9322 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9323 9324 if (Scope *S = getScopeForContext(ClassDecl)) 9325 PushOnScopeChains(MoveAssignment, S, false); 9326 ClassDecl->addDecl(MoveAssignment); 9327 9328 return MoveAssignment; 9329} 9330 9331void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9332 CXXMethodDecl *MoveAssignOperator) { 9333 assert((MoveAssignOperator->isDefaulted() && 9334 MoveAssignOperator->isOverloadedOperator() && 9335 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9336 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9337 !MoveAssignOperator->isDeleted()) && 9338 "DefineImplicitMoveAssignment called for wrong function"); 9339 9340 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9341 9342 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9343 MoveAssignOperator->setInvalidDecl(); 9344 return; 9345 } 9346 9347 MoveAssignOperator->setUsed(); 9348 9349 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9350 DiagnosticErrorTrap Trap(Diags); 9351 9352 // C++0x [class.copy]p28: 9353 // The implicitly-defined or move assignment operator for a non-union class 9354 // X performs memberwise move assignment of its subobjects. The direct base 9355 // classes of X are assigned first, in the order of their declaration in the 9356 // base-specifier-list, and then the immediate non-static data members of X 9357 // are assigned, in the order in which they were declared in the class 9358 // definition. 9359 9360 // The statements that form the synthesized function body. 9361 SmallVector<Stmt*, 8> Statements; 9362 9363 // The parameter for the "other" object, which we are move from. 9364 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9365 QualType OtherRefType = Other->getType()-> 9366 getAs<RValueReferenceType>()->getPointeeType(); 9367 assert(!OtherRefType.getQualifiers() && 9368 "Bad argument type of defaulted move assignment"); 9369 9370 // Our location for everything implicitly-generated. 9371 SourceLocation Loc = MoveAssignOperator->getLocation(); 9372 9373 // Construct a reference to the "other" object. We'll be using this 9374 // throughout the generated ASTs. 9375 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9376 assert(OtherRef && "Reference to parameter cannot fail!"); 9377 // Cast to rvalue. 9378 OtherRef = CastForMoving(*this, OtherRef); 9379 9380 // Construct the "this" pointer. We'll be using this throughout the generated 9381 // ASTs. 9382 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9383 assert(This && "Reference to this cannot fail!"); 9384 9385 // Assign base classes. 9386 bool Invalid = false; 9387 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9388 E = ClassDecl->bases_end(); Base != E; ++Base) { 9389 // Form the assignment: 9390 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9391 QualType BaseType = Base->getType().getUnqualifiedType(); 9392 if (!BaseType->isRecordType()) { 9393 Invalid = true; 9394 continue; 9395 } 9396 9397 CXXCastPath BasePath; 9398 BasePath.push_back(Base); 9399 9400 // Construct the "from" expression, which is an implicit cast to the 9401 // appropriately-qualified base type. 9402 Expr *From = OtherRef; 9403 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9404 VK_XValue, &BasePath).take(); 9405 9406 // Dereference "this". 9407 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9408 9409 // Implicitly cast "this" to the appropriately-qualified base type. 9410 To = ImpCastExprToType(To.take(), 9411 Context.getCVRQualifiedType(BaseType, 9412 MoveAssignOperator->getTypeQualifiers()), 9413 CK_UncheckedDerivedToBase, 9414 VK_LValue, &BasePath); 9415 9416 // Build the move. 9417 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9418 To.get(), From, 9419 /*CopyingBaseSubobject=*/true, 9420 /*Copying=*/false); 9421 if (Move.isInvalid()) { 9422 Diag(CurrentLocation, diag::note_member_synthesized_at) 9423 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9424 MoveAssignOperator->setInvalidDecl(); 9425 return; 9426 } 9427 9428 // Success! Record the move. 9429 Statements.push_back(Move.takeAs<Expr>()); 9430 } 9431 9432 // Assign non-static members. 9433 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9434 FieldEnd = ClassDecl->field_end(); 9435 Field != FieldEnd; ++Field) { 9436 if (Field->isUnnamedBitfield()) 9437 continue; 9438 9439 if (Field->isInvalidDecl()) { 9440 Invalid = true; 9441 continue; 9442 } 9443 9444 // Check for members of reference type; we can't move those. 9445 if (Field->getType()->isReferenceType()) { 9446 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9447 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9448 Diag(Field->getLocation(), diag::note_declared_at); 9449 Diag(CurrentLocation, diag::note_member_synthesized_at) 9450 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9451 Invalid = true; 9452 continue; 9453 } 9454 9455 // Check for members of const-qualified, non-class type. 9456 QualType BaseType = Context.getBaseElementType(Field->getType()); 9457 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9458 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9459 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9460 Diag(Field->getLocation(), diag::note_declared_at); 9461 Diag(CurrentLocation, diag::note_member_synthesized_at) 9462 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9463 Invalid = true; 9464 continue; 9465 } 9466 9467 // Suppress assigning zero-width bitfields. 9468 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9469 continue; 9470 9471 QualType FieldType = Field->getType().getNonReferenceType(); 9472 if (FieldType->isIncompleteArrayType()) { 9473 assert(ClassDecl->hasFlexibleArrayMember() && 9474 "Incomplete array type is not valid"); 9475 continue; 9476 } 9477 9478 // Build references to the field in the object we're copying from and to. 9479 CXXScopeSpec SS; // Intentionally empty 9480 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9481 LookupMemberName); 9482 MemberLookup.addDecl(*Field); 9483 MemberLookup.resolveKind(); 9484 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9485 Loc, /*IsArrow=*/false, 9486 SS, SourceLocation(), 0, 9487 MemberLookup, 0); 9488 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9489 Loc, /*IsArrow=*/true, 9490 SS, SourceLocation(), 0, 9491 MemberLookup, 0); 9492 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9493 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9494 9495 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9496 "Member reference with rvalue base must be rvalue except for reference " 9497 "members, which aren't allowed for move assignment."); 9498 9499 // Build the move of this field. 9500 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9501 To.get(), From.get(), 9502 /*CopyingBaseSubobject=*/false, 9503 /*Copying=*/false); 9504 if (Move.isInvalid()) { 9505 Diag(CurrentLocation, diag::note_member_synthesized_at) 9506 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9507 MoveAssignOperator->setInvalidDecl(); 9508 return; 9509 } 9510 9511 // Success! Record the copy. 9512 Statements.push_back(Move.takeAs<Stmt>()); 9513 } 9514 9515 if (!Invalid) { 9516 // Add a "return *this;" 9517 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9518 9519 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9520 if (Return.isInvalid()) 9521 Invalid = true; 9522 else { 9523 Statements.push_back(Return.takeAs<Stmt>()); 9524 9525 if (Trap.hasErrorOccurred()) { 9526 Diag(CurrentLocation, diag::note_member_synthesized_at) 9527 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9528 Invalid = true; 9529 } 9530 } 9531 } 9532 9533 if (Invalid) { 9534 MoveAssignOperator->setInvalidDecl(); 9535 return; 9536 } 9537 9538 StmtResult Body; 9539 { 9540 CompoundScopeRAII CompoundScope(*this); 9541 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9542 /*isStmtExpr=*/false); 9543 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9544 } 9545 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9546 9547 if (ASTMutationListener *L = getASTMutationListener()) { 9548 L->CompletedImplicitDefinition(MoveAssignOperator); 9549 } 9550} 9551 9552Sema::ImplicitExceptionSpecification 9553Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9554 CXXRecordDecl *ClassDecl = MD->getParent(); 9555 9556 ImplicitExceptionSpecification ExceptSpec(*this); 9557 if (ClassDecl->isInvalidDecl()) 9558 return ExceptSpec; 9559 9560 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9561 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9562 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9563 9564 // C++ [except.spec]p14: 9565 // An implicitly declared special member function (Clause 12) shall have an 9566 // exception-specification. [...] 9567 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9568 BaseEnd = ClassDecl->bases_end(); 9569 Base != BaseEnd; 9570 ++Base) { 9571 // Virtual bases are handled below. 9572 if (Base->isVirtual()) 9573 continue; 9574 9575 CXXRecordDecl *BaseClassDecl 9576 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9577 if (CXXConstructorDecl *CopyConstructor = 9578 LookupCopyingConstructor(BaseClassDecl, Quals)) 9579 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9580 } 9581 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9582 BaseEnd = ClassDecl->vbases_end(); 9583 Base != BaseEnd; 9584 ++Base) { 9585 CXXRecordDecl *BaseClassDecl 9586 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9587 if (CXXConstructorDecl *CopyConstructor = 9588 LookupCopyingConstructor(BaseClassDecl, Quals)) 9589 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9590 } 9591 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9592 FieldEnd = ClassDecl->field_end(); 9593 Field != FieldEnd; 9594 ++Field) { 9595 QualType FieldType = Context.getBaseElementType(Field->getType()); 9596 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9597 if (CXXConstructorDecl *CopyConstructor = 9598 LookupCopyingConstructor(FieldClassDecl, 9599 Quals | FieldType.getCVRQualifiers())) 9600 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9601 } 9602 } 9603 9604 return ExceptSpec; 9605} 9606 9607CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9608 CXXRecordDecl *ClassDecl) { 9609 // C++ [class.copy]p4: 9610 // If the class definition does not explicitly declare a copy 9611 // constructor, one is declared implicitly. 9612 assert(ClassDecl->needsImplicitCopyConstructor()); 9613 9614 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9615 if (DSM.isAlreadyBeingDeclared()) 9616 return 0; 9617 9618 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9619 QualType ArgType = ClassType; 9620 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9621 if (Const) 9622 ArgType = ArgType.withConst(); 9623 ArgType = Context.getLValueReferenceType(ArgType); 9624 9625 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9626 CXXCopyConstructor, 9627 Const); 9628 9629 DeclarationName Name 9630 = Context.DeclarationNames.getCXXConstructorName( 9631 Context.getCanonicalType(ClassType)); 9632 SourceLocation ClassLoc = ClassDecl->getLocation(); 9633 DeclarationNameInfo NameInfo(Name, ClassLoc); 9634 9635 // An implicitly-declared copy constructor is an inline public 9636 // member of its class. 9637 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9638 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9639 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9640 Constexpr); 9641 CopyConstructor->setAccess(AS_public); 9642 CopyConstructor->setDefaulted(); 9643 9644 // Build an exception specification pointing back at this member. 9645 FunctionProtoType::ExtProtoInfo EPI; 9646 EPI.ExceptionSpecType = EST_Unevaluated; 9647 EPI.ExceptionSpecDecl = CopyConstructor; 9648 CopyConstructor->setType( 9649 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9650 9651 // Add the parameter to the constructor. 9652 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9653 ClassLoc, ClassLoc, 9654 /*IdentifierInfo=*/0, 9655 ArgType, /*TInfo=*/0, 9656 SC_None, 0); 9657 CopyConstructor->setParams(FromParam); 9658 9659 CopyConstructor->setTrivial( 9660 ClassDecl->needsOverloadResolutionForCopyConstructor() 9661 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9662 : ClassDecl->hasTrivialCopyConstructor()); 9663 9664 // C++11 [class.copy]p8: 9665 // ... If the class definition does not explicitly declare a copy 9666 // constructor, there is no user-declared move constructor, and there is no 9667 // user-declared move assignment operator, a copy constructor is implicitly 9668 // declared as defaulted. 9669 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9670 SetDeclDeleted(CopyConstructor, ClassLoc); 9671 9672 // Note that we have declared this constructor. 9673 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9674 9675 if (Scope *S = getScopeForContext(ClassDecl)) 9676 PushOnScopeChains(CopyConstructor, S, false); 9677 ClassDecl->addDecl(CopyConstructor); 9678 9679 return CopyConstructor; 9680} 9681 9682void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9683 CXXConstructorDecl *CopyConstructor) { 9684 assert((CopyConstructor->isDefaulted() && 9685 CopyConstructor->isCopyConstructor() && 9686 !CopyConstructor->doesThisDeclarationHaveABody() && 9687 !CopyConstructor->isDeleted()) && 9688 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9689 9690 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9691 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9692 9693 // C++11 [class.copy]p7: 9694 // The [definition of an implicitly declared copy constructro] is 9695 // deprecated if the class has a user-declared copy assignment operator 9696 // or a user-declared destructor. 9697 if (getLangOpts().CPlusPlus11 && CopyConstructor->isImplicit()) 9698 diagnoseDeprecatedCopyOperation(*this, CopyConstructor, CurrentLocation); 9699 9700 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9701 DiagnosticErrorTrap Trap(Diags); 9702 9703 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9704 Trap.hasErrorOccurred()) { 9705 Diag(CurrentLocation, diag::note_member_synthesized_at) 9706 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9707 CopyConstructor->setInvalidDecl(); 9708 } else { 9709 Sema::CompoundScopeRAII CompoundScope(*this); 9710 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9711 CopyConstructor->getLocation(), 9712 MultiStmtArg(), 9713 /*isStmtExpr=*/false) 9714 .takeAs<Stmt>()); 9715 CopyConstructor->setImplicitlyDefined(true); 9716 } 9717 9718 CopyConstructor->setUsed(); 9719 if (ASTMutationListener *L = getASTMutationListener()) { 9720 L->CompletedImplicitDefinition(CopyConstructor); 9721 } 9722} 9723 9724Sema::ImplicitExceptionSpecification 9725Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9726 CXXRecordDecl *ClassDecl = MD->getParent(); 9727 9728 // C++ [except.spec]p14: 9729 // An implicitly declared special member function (Clause 12) shall have an 9730 // exception-specification. [...] 9731 ImplicitExceptionSpecification ExceptSpec(*this); 9732 if (ClassDecl->isInvalidDecl()) 9733 return ExceptSpec; 9734 9735 // Direct base-class constructors. 9736 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9737 BEnd = ClassDecl->bases_end(); 9738 B != BEnd; ++B) { 9739 if (B->isVirtual()) // Handled below. 9740 continue; 9741 9742 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9743 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9744 CXXConstructorDecl *Constructor = 9745 LookupMovingConstructor(BaseClassDecl, 0); 9746 // If this is a deleted function, add it anyway. This might be conformant 9747 // with the standard. This might not. I'm not sure. It might not matter. 9748 if (Constructor) 9749 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9750 } 9751 } 9752 9753 // Virtual base-class constructors. 9754 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9755 BEnd = ClassDecl->vbases_end(); 9756 B != BEnd; ++B) { 9757 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9758 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9759 CXXConstructorDecl *Constructor = 9760 LookupMovingConstructor(BaseClassDecl, 0); 9761 // If this is a deleted function, add it anyway. This might be conformant 9762 // with the standard. This might not. I'm not sure. It might not matter. 9763 if (Constructor) 9764 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9765 } 9766 } 9767 9768 // Field constructors. 9769 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9770 FEnd = ClassDecl->field_end(); 9771 F != FEnd; ++F) { 9772 QualType FieldType = Context.getBaseElementType(F->getType()); 9773 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9774 CXXConstructorDecl *Constructor = 9775 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9776 // If this is a deleted function, add it anyway. This might be conformant 9777 // with the standard. This might not. I'm not sure. It might not matter. 9778 // In particular, the problem is that this function never gets called. It 9779 // might just be ill-formed because this function attempts to refer to 9780 // a deleted function here. 9781 if (Constructor) 9782 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9783 } 9784 } 9785 9786 return ExceptSpec; 9787} 9788 9789CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9790 CXXRecordDecl *ClassDecl) { 9791 // C++11 [class.copy]p9: 9792 // If the definition of a class X does not explicitly declare a move 9793 // constructor, one will be implicitly declared as defaulted if and only if: 9794 // 9795 // - [first 4 bullets] 9796 assert(ClassDecl->needsImplicitMoveConstructor()); 9797 9798 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9799 if (DSM.isAlreadyBeingDeclared()) 9800 return 0; 9801 9802 // [Checked after we build the declaration] 9803 // - the move assignment operator would not be implicitly defined as 9804 // deleted, 9805 9806 // [DR1402]: 9807 // - each of X's non-static data members and direct or virtual base classes 9808 // has a type that either has a move constructor or is trivially copyable. 9809 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9810 ClassDecl->setFailedImplicitMoveConstructor(); 9811 return 0; 9812 } 9813 9814 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9815 QualType ArgType = Context.getRValueReferenceType(ClassType); 9816 9817 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9818 CXXMoveConstructor, 9819 false); 9820 9821 DeclarationName Name 9822 = Context.DeclarationNames.getCXXConstructorName( 9823 Context.getCanonicalType(ClassType)); 9824 SourceLocation ClassLoc = ClassDecl->getLocation(); 9825 DeclarationNameInfo NameInfo(Name, ClassLoc); 9826 9827 // C++11 [class.copy]p11: 9828 // An implicitly-declared copy/move constructor is an inline public 9829 // member of its class. 9830 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9831 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9832 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9833 Constexpr); 9834 MoveConstructor->setAccess(AS_public); 9835 MoveConstructor->setDefaulted(); 9836 9837 // Build an exception specification pointing back at this member. 9838 FunctionProtoType::ExtProtoInfo EPI; 9839 EPI.ExceptionSpecType = EST_Unevaluated; 9840 EPI.ExceptionSpecDecl = MoveConstructor; 9841 MoveConstructor->setType( 9842 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9843 9844 // Add the parameter to the constructor. 9845 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9846 ClassLoc, ClassLoc, 9847 /*IdentifierInfo=*/0, 9848 ArgType, /*TInfo=*/0, 9849 SC_None, 0); 9850 MoveConstructor->setParams(FromParam); 9851 9852 MoveConstructor->setTrivial( 9853 ClassDecl->needsOverloadResolutionForMoveConstructor() 9854 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9855 : ClassDecl->hasTrivialMoveConstructor()); 9856 9857 // C++0x [class.copy]p9: 9858 // If the definition of a class X does not explicitly declare a move 9859 // constructor, one will be implicitly declared as defaulted if and only if: 9860 // [...] 9861 // - the move constructor would not be implicitly defined as deleted. 9862 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9863 // Cache this result so that we don't try to generate this over and over 9864 // on every lookup, leaking memory and wasting time. 9865 ClassDecl->setFailedImplicitMoveConstructor(); 9866 return 0; 9867 } 9868 9869 // Note that we have declared this constructor. 9870 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9871 9872 if (Scope *S = getScopeForContext(ClassDecl)) 9873 PushOnScopeChains(MoveConstructor, S, false); 9874 ClassDecl->addDecl(MoveConstructor); 9875 9876 return MoveConstructor; 9877} 9878 9879void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9880 CXXConstructorDecl *MoveConstructor) { 9881 assert((MoveConstructor->isDefaulted() && 9882 MoveConstructor->isMoveConstructor() && 9883 !MoveConstructor->doesThisDeclarationHaveABody() && 9884 !MoveConstructor->isDeleted()) && 9885 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9886 9887 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9888 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9889 9890 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9891 DiagnosticErrorTrap Trap(Diags); 9892 9893 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9894 Trap.hasErrorOccurred()) { 9895 Diag(CurrentLocation, diag::note_member_synthesized_at) 9896 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9897 MoveConstructor->setInvalidDecl(); 9898 } else { 9899 Sema::CompoundScopeRAII CompoundScope(*this); 9900 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9901 MoveConstructor->getLocation(), 9902 MultiStmtArg(), 9903 /*isStmtExpr=*/false) 9904 .takeAs<Stmt>()); 9905 MoveConstructor->setImplicitlyDefined(true); 9906 } 9907 9908 MoveConstructor->setUsed(); 9909 9910 if (ASTMutationListener *L = getASTMutationListener()) { 9911 L->CompletedImplicitDefinition(MoveConstructor); 9912 } 9913} 9914 9915bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9916 return FD->isDeleted() && 9917 (FD->isDefaulted() || FD->isImplicit()) && 9918 isa<CXXMethodDecl>(FD); 9919} 9920 9921/// \brief Mark the call operator of the given lambda closure type as "used". 9922static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9923 CXXMethodDecl *CallOperator 9924 = cast<CXXMethodDecl>( 9925 Lambda->lookup( 9926 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9927 CallOperator->setReferenced(); 9928 CallOperator->setUsed(); 9929} 9930 9931void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9932 SourceLocation CurrentLocation, 9933 CXXConversionDecl *Conv) 9934{ 9935 CXXRecordDecl *Lambda = Conv->getParent(); 9936 9937 // Make sure that the lambda call operator is marked used. 9938 markLambdaCallOperatorUsed(*this, Lambda); 9939 9940 Conv->setUsed(); 9941 9942 SynthesizedFunctionScope Scope(*this, Conv); 9943 DiagnosticErrorTrap Trap(Diags); 9944 9945 // Return the address of the __invoke function. 9946 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9947 CXXMethodDecl *Invoke 9948 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9949 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9950 VK_LValue, Conv->getLocation()).take(); 9951 assert(FunctionRef && "Can't refer to __invoke function?"); 9952 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9953 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9954 Conv->getLocation(), 9955 Conv->getLocation())); 9956 9957 // Fill in the __invoke function with a dummy implementation. IR generation 9958 // will fill in the actual details. 9959 Invoke->setUsed(); 9960 Invoke->setReferenced(); 9961 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9962 9963 if (ASTMutationListener *L = getASTMutationListener()) { 9964 L->CompletedImplicitDefinition(Conv); 9965 L->CompletedImplicitDefinition(Invoke); 9966 } 9967} 9968 9969void Sema::DefineImplicitLambdaToBlockPointerConversion( 9970 SourceLocation CurrentLocation, 9971 CXXConversionDecl *Conv) 9972{ 9973 Conv->setUsed(); 9974 9975 SynthesizedFunctionScope Scope(*this, Conv); 9976 DiagnosticErrorTrap Trap(Diags); 9977 9978 // Copy-initialize the lambda object as needed to capture it. 9979 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9980 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9981 9982 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9983 Conv->getLocation(), 9984 Conv, DerefThis); 9985 9986 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9987 // behavior. Note that only the general conversion function does this 9988 // (since it's unusable otherwise); in the case where we inline the 9989 // block literal, it has block literal lifetime semantics. 9990 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9991 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9992 CK_CopyAndAutoreleaseBlockObject, 9993 BuildBlock.get(), 0, VK_RValue); 9994 9995 if (BuildBlock.isInvalid()) { 9996 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9997 Conv->setInvalidDecl(); 9998 return; 9999 } 10000 10001 // Create the return statement that returns the block from the conversion 10002 // function. 10003 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 10004 if (Return.isInvalid()) { 10005 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 10006 Conv->setInvalidDecl(); 10007 return; 10008 } 10009 10010 // Set the body of the conversion function. 10011 Stmt *ReturnS = Return.take(); 10012 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 10013 Conv->getLocation(), 10014 Conv->getLocation())); 10015 10016 // We're done; notify the mutation listener, if any. 10017 if (ASTMutationListener *L = getASTMutationListener()) { 10018 L->CompletedImplicitDefinition(Conv); 10019 } 10020} 10021 10022/// \brief Determine whether the given list arguments contains exactly one 10023/// "real" (non-default) argument. 10024static bool hasOneRealArgument(MultiExprArg Args) { 10025 switch (Args.size()) { 10026 case 0: 10027 return false; 10028 10029 default: 10030 if (!Args[1]->isDefaultArgument()) 10031 return false; 10032 10033 // fall through 10034 case 1: 10035 return !Args[0]->isDefaultArgument(); 10036 } 10037 10038 return false; 10039} 10040 10041ExprResult 10042Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10043 CXXConstructorDecl *Constructor, 10044 MultiExprArg ExprArgs, 10045 bool HadMultipleCandidates, 10046 bool IsListInitialization, 10047 bool RequiresZeroInit, 10048 unsigned ConstructKind, 10049 SourceRange ParenRange) { 10050 bool Elidable = false; 10051 10052 // C++0x [class.copy]p34: 10053 // When certain criteria are met, an implementation is allowed to 10054 // omit the copy/move construction of a class object, even if the 10055 // copy/move constructor and/or destructor for the object have 10056 // side effects. [...] 10057 // - when a temporary class object that has not been bound to a 10058 // reference (12.2) would be copied/moved to a class object 10059 // with the same cv-unqualified type, the copy/move operation 10060 // can be omitted by constructing the temporary object 10061 // directly into the target of the omitted copy/move 10062 if (ConstructKind == CXXConstructExpr::CK_Complete && 10063 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 10064 Expr *SubExpr = ExprArgs[0]; 10065 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 10066 } 10067 10068 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 10069 Elidable, ExprArgs, HadMultipleCandidates, 10070 IsListInitialization, RequiresZeroInit, 10071 ConstructKind, ParenRange); 10072} 10073 10074/// BuildCXXConstructExpr - Creates a complete call to a constructor, 10075/// including handling of its default argument expressions. 10076ExprResult 10077Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 10078 CXXConstructorDecl *Constructor, bool Elidable, 10079 MultiExprArg ExprArgs, 10080 bool HadMultipleCandidates, 10081 bool IsListInitialization, 10082 bool RequiresZeroInit, 10083 unsigned ConstructKind, 10084 SourceRange ParenRange) { 10085 MarkFunctionReferenced(ConstructLoc, Constructor); 10086 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 10087 Constructor, Elidable, ExprArgs, 10088 HadMultipleCandidates, 10089 IsListInitialization, RequiresZeroInit, 10090 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 10091 ParenRange)); 10092} 10093 10094void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 10095 if (VD->isInvalidDecl()) return; 10096 10097 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 10098 if (ClassDecl->isInvalidDecl()) return; 10099 if (ClassDecl->hasIrrelevantDestructor()) return; 10100 if (ClassDecl->isDependentContext()) return; 10101 10102 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 10103 MarkFunctionReferenced(VD->getLocation(), Destructor); 10104 CheckDestructorAccess(VD->getLocation(), Destructor, 10105 PDiag(diag::err_access_dtor_var) 10106 << VD->getDeclName() 10107 << VD->getType()); 10108 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 10109 10110 if (!VD->hasGlobalStorage()) return; 10111 10112 // Emit warning for non-trivial dtor in global scope (a real global, 10113 // class-static, function-static). 10114 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 10115 10116 // TODO: this should be re-enabled for static locals by !CXAAtExit 10117 if (!VD->isStaticLocal()) 10118 Diag(VD->getLocation(), diag::warn_global_destructor); 10119} 10120 10121/// \brief Given a constructor and the set of arguments provided for the 10122/// constructor, convert the arguments and add any required default arguments 10123/// to form a proper call to this constructor. 10124/// 10125/// \returns true if an error occurred, false otherwise. 10126bool 10127Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 10128 MultiExprArg ArgsPtr, 10129 SourceLocation Loc, 10130 SmallVectorImpl<Expr*> &ConvertedArgs, 10131 bool AllowExplicit, 10132 bool IsListInitialization) { 10133 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 10134 unsigned NumArgs = ArgsPtr.size(); 10135 Expr **Args = ArgsPtr.data(); 10136 10137 const FunctionProtoType *Proto 10138 = Constructor->getType()->getAs<FunctionProtoType>(); 10139 assert(Proto && "Constructor without a prototype?"); 10140 unsigned NumArgsInProto = Proto->getNumArgs(); 10141 10142 // If too few arguments are available, we'll fill in the rest with defaults. 10143 if (NumArgs < NumArgsInProto) 10144 ConvertedArgs.reserve(NumArgsInProto); 10145 else 10146 ConvertedArgs.reserve(NumArgs); 10147 10148 VariadicCallType CallType = 10149 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 10150 SmallVector<Expr *, 8> AllArgs; 10151 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 10152 Proto, 0, 10153 llvm::makeArrayRef(Args, NumArgs), 10154 AllArgs, 10155 CallType, AllowExplicit, 10156 IsListInitialization); 10157 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 10158 10159 DiagnoseSentinelCalls(Constructor, Loc, AllArgs); 10160 10161 CheckConstructorCall(Constructor, 10162 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 10163 AllArgs.size()), 10164 Proto, Loc); 10165 10166 return Invalid; 10167} 10168 10169static inline bool 10170CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 10171 const FunctionDecl *FnDecl) { 10172 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 10173 if (isa<NamespaceDecl>(DC)) { 10174 return SemaRef.Diag(FnDecl->getLocation(), 10175 diag::err_operator_new_delete_declared_in_namespace) 10176 << FnDecl->getDeclName(); 10177 } 10178 10179 if (isa<TranslationUnitDecl>(DC) && 10180 FnDecl->getStorageClass() == SC_Static) { 10181 return SemaRef.Diag(FnDecl->getLocation(), 10182 diag::err_operator_new_delete_declared_static) 10183 << FnDecl->getDeclName(); 10184 } 10185 10186 return false; 10187} 10188 10189static inline bool 10190CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 10191 CanQualType ExpectedResultType, 10192 CanQualType ExpectedFirstParamType, 10193 unsigned DependentParamTypeDiag, 10194 unsigned InvalidParamTypeDiag) { 10195 QualType ResultType = 10196 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 10197 10198 // Check that the result type is not dependent. 10199 if (ResultType->isDependentType()) 10200 return SemaRef.Diag(FnDecl->getLocation(), 10201 diag::err_operator_new_delete_dependent_result_type) 10202 << FnDecl->getDeclName() << ExpectedResultType; 10203 10204 // Check that the result type is what we expect. 10205 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 10206 return SemaRef.Diag(FnDecl->getLocation(), 10207 diag::err_operator_new_delete_invalid_result_type) 10208 << FnDecl->getDeclName() << ExpectedResultType; 10209 10210 // A function template must have at least 2 parameters. 10211 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 10212 return SemaRef.Diag(FnDecl->getLocation(), 10213 diag::err_operator_new_delete_template_too_few_parameters) 10214 << FnDecl->getDeclName(); 10215 10216 // The function decl must have at least 1 parameter. 10217 if (FnDecl->getNumParams() == 0) 10218 return SemaRef.Diag(FnDecl->getLocation(), 10219 diag::err_operator_new_delete_too_few_parameters) 10220 << FnDecl->getDeclName(); 10221 10222 // Check the first parameter type is not dependent. 10223 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10224 if (FirstParamType->isDependentType()) 10225 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10226 << FnDecl->getDeclName() << ExpectedFirstParamType; 10227 10228 // Check that the first parameter type is what we expect. 10229 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10230 ExpectedFirstParamType) 10231 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10232 << FnDecl->getDeclName() << ExpectedFirstParamType; 10233 10234 return false; 10235} 10236 10237static bool 10238CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10239 // C++ [basic.stc.dynamic.allocation]p1: 10240 // A program is ill-formed if an allocation function is declared in a 10241 // namespace scope other than global scope or declared static in global 10242 // scope. 10243 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10244 return true; 10245 10246 CanQualType SizeTy = 10247 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10248 10249 // C++ [basic.stc.dynamic.allocation]p1: 10250 // The return type shall be void*. The first parameter shall have type 10251 // std::size_t. 10252 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10253 SizeTy, 10254 diag::err_operator_new_dependent_param_type, 10255 diag::err_operator_new_param_type)) 10256 return true; 10257 10258 // C++ [basic.stc.dynamic.allocation]p1: 10259 // The first parameter shall not have an associated default argument. 10260 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10261 return SemaRef.Diag(FnDecl->getLocation(), 10262 diag::err_operator_new_default_arg) 10263 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10264 10265 return false; 10266} 10267 10268static bool 10269CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10270 // C++ [basic.stc.dynamic.deallocation]p1: 10271 // A program is ill-formed if deallocation functions are declared in a 10272 // namespace scope other than global scope or declared static in global 10273 // scope. 10274 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10275 return true; 10276 10277 // C++ [basic.stc.dynamic.deallocation]p2: 10278 // Each deallocation function shall return void and its first parameter 10279 // shall be void*. 10280 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10281 SemaRef.Context.VoidPtrTy, 10282 diag::err_operator_delete_dependent_param_type, 10283 diag::err_operator_delete_param_type)) 10284 return true; 10285 10286 return false; 10287} 10288 10289/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10290/// of this overloaded operator is well-formed. If so, returns false; 10291/// otherwise, emits appropriate diagnostics and returns true. 10292bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10293 assert(FnDecl && FnDecl->isOverloadedOperator() && 10294 "Expected an overloaded operator declaration"); 10295 10296 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10297 10298 // C++ [over.oper]p5: 10299 // The allocation and deallocation functions, operator new, 10300 // operator new[], operator delete and operator delete[], are 10301 // described completely in 3.7.3. The attributes and restrictions 10302 // found in the rest of this subclause do not apply to them unless 10303 // explicitly stated in 3.7.3. 10304 if (Op == OO_Delete || Op == OO_Array_Delete) 10305 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10306 10307 if (Op == OO_New || Op == OO_Array_New) 10308 return CheckOperatorNewDeclaration(*this, FnDecl); 10309 10310 // C++ [over.oper]p6: 10311 // An operator function shall either be a non-static member 10312 // function or be a non-member function and have at least one 10313 // parameter whose type is a class, a reference to a class, an 10314 // enumeration, or a reference to an enumeration. 10315 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10316 if (MethodDecl->isStatic()) 10317 return Diag(FnDecl->getLocation(), 10318 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10319 } else { 10320 bool ClassOrEnumParam = false; 10321 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10322 ParamEnd = FnDecl->param_end(); 10323 Param != ParamEnd; ++Param) { 10324 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10325 if (ParamType->isDependentType() || ParamType->isRecordType() || 10326 ParamType->isEnumeralType()) { 10327 ClassOrEnumParam = true; 10328 break; 10329 } 10330 } 10331 10332 if (!ClassOrEnumParam) 10333 return Diag(FnDecl->getLocation(), 10334 diag::err_operator_overload_needs_class_or_enum) 10335 << FnDecl->getDeclName(); 10336 } 10337 10338 // C++ [over.oper]p8: 10339 // An operator function cannot have default arguments (8.3.6), 10340 // except where explicitly stated below. 10341 // 10342 // Only the function-call operator allows default arguments 10343 // (C++ [over.call]p1). 10344 if (Op != OO_Call) { 10345 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10346 Param != FnDecl->param_end(); ++Param) { 10347 if ((*Param)->hasDefaultArg()) 10348 return Diag((*Param)->getLocation(), 10349 diag::err_operator_overload_default_arg) 10350 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10351 } 10352 } 10353 10354 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10355 { false, false, false } 10356#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10357 , { Unary, Binary, MemberOnly } 10358#include "clang/Basic/OperatorKinds.def" 10359 }; 10360 10361 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10362 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10363 bool MustBeMemberOperator = OperatorUses[Op][2]; 10364 10365 // C++ [over.oper]p8: 10366 // [...] Operator functions cannot have more or fewer parameters 10367 // than the number required for the corresponding operator, as 10368 // described in the rest of this subclause. 10369 unsigned NumParams = FnDecl->getNumParams() 10370 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10371 if (Op != OO_Call && 10372 ((NumParams == 1 && !CanBeUnaryOperator) || 10373 (NumParams == 2 && !CanBeBinaryOperator) || 10374 (NumParams < 1) || (NumParams > 2))) { 10375 // We have the wrong number of parameters. 10376 unsigned ErrorKind; 10377 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10378 ErrorKind = 2; // 2 -> unary or binary. 10379 } else if (CanBeUnaryOperator) { 10380 ErrorKind = 0; // 0 -> unary 10381 } else { 10382 assert(CanBeBinaryOperator && 10383 "All non-call overloaded operators are unary or binary!"); 10384 ErrorKind = 1; // 1 -> binary 10385 } 10386 10387 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10388 << FnDecl->getDeclName() << NumParams << ErrorKind; 10389 } 10390 10391 // Overloaded operators other than operator() cannot be variadic. 10392 if (Op != OO_Call && 10393 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10394 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10395 << FnDecl->getDeclName(); 10396 } 10397 10398 // Some operators must be non-static member functions. 10399 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10400 return Diag(FnDecl->getLocation(), 10401 diag::err_operator_overload_must_be_member) 10402 << FnDecl->getDeclName(); 10403 } 10404 10405 // C++ [over.inc]p1: 10406 // The user-defined function called operator++ implements the 10407 // prefix and postfix ++ operator. If this function is a member 10408 // function with no parameters, or a non-member function with one 10409 // parameter of class or enumeration type, it defines the prefix 10410 // increment operator ++ for objects of that type. If the function 10411 // is a member function with one parameter (which shall be of type 10412 // int) or a non-member function with two parameters (the second 10413 // of which shall be of type int), it defines the postfix 10414 // increment operator ++ for objects of that type. 10415 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10416 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10417 bool ParamIsInt = false; 10418 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10419 ParamIsInt = BT->getKind() == BuiltinType::Int; 10420 10421 if (!ParamIsInt) 10422 return Diag(LastParam->getLocation(), 10423 diag::err_operator_overload_post_incdec_must_be_int) 10424 << LastParam->getType() << (Op == OO_MinusMinus); 10425 } 10426 10427 return false; 10428} 10429 10430/// CheckLiteralOperatorDeclaration - Check whether the declaration 10431/// of this literal operator function is well-formed. If so, returns 10432/// false; otherwise, emits appropriate diagnostics and returns true. 10433bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10434 if (isa<CXXMethodDecl>(FnDecl)) { 10435 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10436 << FnDecl->getDeclName(); 10437 return true; 10438 } 10439 10440 if (FnDecl->isExternC()) { 10441 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10442 return true; 10443 } 10444 10445 bool Valid = false; 10446 10447 // This might be the definition of a literal operator template. 10448 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10449 // This might be a specialization of a literal operator template. 10450 if (!TpDecl) 10451 TpDecl = FnDecl->getPrimaryTemplate(); 10452 10453 // template <char...> type operator "" name() is the only valid template 10454 // signature, and the only valid signature with no parameters. 10455 if (TpDecl) { 10456 if (FnDecl->param_size() == 0) { 10457 // Must have only one template parameter 10458 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10459 if (Params->size() == 1) { 10460 NonTypeTemplateParmDecl *PmDecl = 10461 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10462 10463 // The template parameter must be a char parameter pack. 10464 if (PmDecl && PmDecl->isTemplateParameterPack() && 10465 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10466 Valid = true; 10467 } 10468 } 10469 } else if (FnDecl->param_size()) { 10470 // Check the first parameter 10471 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10472 10473 QualType T = (*Param)->getType().getUnqualifiedType(); 10474 10475 // unsigned long long int, long double, and any character type are allowed 10476 // as the only parameters. 10477 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10478 Context.hasSameType(T, Context.LongDoubleTy) || 10479 Context.hasSameType(T, Context.CharTy) || 10480 Context.hasSameType(T, Context.WideCharTy) || 10481 Context.hasSameType(T, Context.Char16Ty) || 10482 Context.hasSameType(T, Context.Char32Ty)) { 10483 if (++Param == FnDecl->param_end()) 10484 Valid = true; 10485 goto FinishedParams; 10486 } 10487 10488 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10489 const PointerType *PT = T->getAs<PointerType>(); 10490 if (!PT) 10491 goto FinishedParams; 10492 T = PT->getPointeeType(); 10493 if (!T.isConstQualified() || T.isVolatileQualified()) 10494 goto FinishedParams; 10495 T = T.getUnqualifiedType(); 10496 10497 // Move on to the second parameter; 10498 ++Param; 10499 10500 // If there is no second parameter, the first must be a const char * 10501 if (Param == FnDecl->param_end()) { 10502 if (Context.hasSameType(T, Context.CharTy)) 10503 Valid = true; 10504 goto FinishedParams; 10505 } 10506 10507 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10508 // are allowed as the first parameter to a two-parameter function 10509 if (!(Context.hasSameType(T, Context.CharTy) || 10510 Context.hasSameType(T, Context.WideCharTy) || 10511 Context.hasSameType(T, Context.Char16Ty) || 10512 Context.hasSameType(T, Context.Char32Ty))) 10513 goto FinishedParams; 10514 10515 // The second and final parameter must be an std::size_t 10516 T = (*Param)->getType().getUnqualifiedType(); 10517 if (Context.hasSameType(T, Context.getSizeType()) && 10518 ++Param == FnDecl->param_end()) 10519 Valid = true; 10520 } 10521 10522 // FIXME: This diagnostic is absolutely terrible. 10523FinishedParams: 10524 if (!Valid) { 10525 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10526 << FnDecl->getDeclName(); 10527 return true; 10528 } 10529 10530 // A parameter-declaration-clause containing a default argument is not 10531 // equivalent to any of the permitted forms. 10532 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10533 ParamEnd = FnDecl->param_end(); 10534 Param != ParamEnd; ++Param) { 10535 if ((*Param)->hasDefaultArg()) { 10536 Diag((*Param)->getDefaultArgRange().getBegin(), 10537 diag::err_literal_operator_default_argument) 10538 << (*Param)->getDefaultArgRange(); 10539 break; 10540 } 10541 } 10542 10543 StringRef LiteralName 10544 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10545 if (LiteralName[0] != '_') { 10546 // C++11 [usrlit.suffix]p1: 10547 // Literal suffix identifiers that do not start with an underscore 10548 // are reserved for future standardization. 10549 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10550 } 10551 10552 return false; 10553} 10554 10555/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10556/// linkage specification, including the language and (if present) 10557/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10558/// the location of the language string literal, which is provided 10559/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10560/// the '{' brace. Otherwise, this linkage specification does not 10561/// have any braces. 10562Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10563 SourceLocation LangLoc, 10564 StringRef Lang, 10565 SourceLocation LBraceLoc) { 10566 LinkageSpecDecl::LanguageIDs Language; 10567 if (Lang == "\"C\"") 10568 Language = LinkageSpecDecl::lang_c; 10569 else if (Lang == "\"C++\"") 10570 Language = LinkageSpecDecl::lang_cxx; 10571 else { 10572 Diag(LangLoc, diag::err_bad_language); 10573 return 0; 10574 } 10575 10576 // FIXME: Add all the various semantics of linkage specifications 10577 10578 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10579 ExternLoc, LangLoc, Language, 10580 LBraceLoc.isValid()); 10581 CurContext->addDecl(D); 10582 PushDeclContext(S, D); 10583 return D; 10584} 10585 10586/// ActOnFinishLinkageSpecification - Complete the definition of 10587/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10588/// valid, it's the position of the closing '}' brace in a linkage 10589/// specification that uses braces. 10590Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10591 Decl *LinkageSpec, 10592 SourceLocation RBraceLoc) { 10593 if (LinkageSpec) { 10594 if (RBraceLoc.isValid()) { 10595 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10596 LSDecl->setRBraceLoc(RBraceLoc); 10597 } 10598 PopDeclContext(); 10599 } 10600 return LinkageSpec; 10601} 10602 10603Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10604 AttributeList *AttrList, 10605 SourceLocation SemiLoc) { 10606 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10607 // Attribute declarations appertain to empty declaration so we handle 10608 // them here. 10609 if (AttrList) 10610 ProcessDeclAttributeList(S, ED, AttrList); 10611 10612 CurContext->addDecl(ED); 10613 return ED; 10614} 10615 10616/// \brief Perform semantic analysis for the variable declaration that 10617/// occurs within a C++ catch clause, returning the newly-created 10618/// variable. 10619VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10620 TypeSourceInfo *TInfo, 10621 SourceLocation StartLoc, 10622 SourceLocation Loc, 10623 IdentifierInfo *Name) { 10624 bool Invalid = false; 10625 QualType ExDeclType = TInfo->getType(); 10626 10627 // Arrays and functions decay. 10628 if (ExDeclType->isArrayType()) 10629 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10630 else if (ExDeclType->isFunctionType()) 10631 ExDeclType = Context.getPointerType(ExDeclType); 10632 10633 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10634 // The exception-declaration shall not denote a pointer or reference to an 10635 // incomplete type, other than [cv] void*. 10636 // N2844 forbids rvalue references. 10637 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10638 Diag(Loc, diag::err_catch_rvalue_ref); 10639 Invalid = true; 10640 } 10641 10642 QualType BaseType = ExDeclType; 10643 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10644 unsigned DK = diag::err_catch_incomplete; 10645 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10646 BaseType = Ptr->getPointeeType(); 10647 Mode = 1; 10648 DK = diag::err_catch_incomplete_ptr; 10649 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10650 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10651 BaseType = Ref->getPointeeType(); 10652 Mode = 2; 10653 DK = diag::err_catch_incomplete_ref; 10654 } 10655 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10656 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10657 Invalid = true; 10658 10659 if (!Invalid && !ExDeclType->isDependentType() && 10660 RequireNonAbstractType(Loc, ExDeclType, 10661 diag::err_abstract_type_in_decl, 10662 AbstractVariableType)) 10663 Invalid = true; 10664 10665 // Only the non-fragile NeXT runtime currently supports C++ catches 10666 // of ObjC types, and no runtime supports catching ObjC types by value. 10667 if (!Invalid && getLangOpts().ObjC1) { 10668 QualType T = ExDeclType; 10669 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10670 T = RT->getPointeeType(); 10671 10672 if (T->isObjCObjectType()) { 10673 Diag(Loc, diag::err_objc_object_catch); 10674 Invalid = true; 10675 } else if (T->isObjCObjectPointerType()) { 10676 // FIXME: should this be a test for macosx-fragile specifically? 10677 if (getLangOpts().ObjCRuntime.isFragile()) 10678 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10679 } 10680 } 10681 10682 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10683 ExDeclType, TInfo, SC_None); 10684 ExDecl->setExceptionVariable(true); 10685 10686 // In ARC, infer 'retaining' for variables of retainable type. 10687 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10688 Invalid = true; 10689 10690 if (!Invalid && !ExDeclType->isDependentType()) { 10691 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10692 // Insulate this from anything else we might currently be parsing. 10693 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10694 10695 // C++ [except.handle]p16: 10696 // The object declared in an exception-declaration or, if the 10697 // exception-declaration does not specify a name, a temporary (12.2) is 10698 // copy-initialized (8.5) from the exception object. [...] 10699 // The object is destroyed when the handler exits, after the destruction 10700 // of any automatic objects initialized within the handler. 10701 // 10702 // We just pretend to initialize the object with itself, then make sure 10703 // it can be destroyed later. 10704 QualType initType = ExDeclType; 10705 10706 InitializedEntity entity = 10707 InitializedEntity::InitializeVariable(ExDecl); 10708 InitializationKind initKind = 10709 InitializationKind::CreateCopy(Loc, SourceLocation()); 10710 10711 Expr *opaqueValue = 10712 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10713 InitializationSequence sequence(*this, entity, initKind, opaqueValue); 10714 ExprResult result = sequence.Perform(*this, entity, initKind, opaqueValue); 10715 if (result.isInvalid()) 10716 Invalid = true; 10717 else { 10718 // If the constructor used was non-trivial, set this as the 10719 // "initializer". 10720 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10721 if (!construct->getConstructor()->isTrivial()) { 10722 Expr *init = MaybeCreateExprWithCleanups(construct); 10723 ExDecl->setInit(init); 10724 } 10725 10726 // And make sure it's destructable. 10727 FinalizeVarWithDestructor(ExDecl, recordType); 10728 } 10729 } 10730 } 10731 10732 if (Invalid) 10733 ExDecl->setInvalidDecl(); 10734 10735 return ExDecl; 10736} 10737 10738/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10739/// handler. 10740Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10741 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10742 bool Invalid = D.isInvalidType(); 10743 10744 // Check for unexpanded parameter packs. 10745 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10746 UPPC_ExceptionType)) { 10747 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10748 D.getIdentifierLoc()); 10749 Invalid = true; 10750 } 10751 10752 IdentifierInfo *II = D.getIdentifier(); 10753 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10754 LookupOrdinaryName, 10755 ForRedeclaration)) { 10756 // The scope should be freshly made just for us. There is just no way 10757 // it contains any previous declaration. 10758 assert(!S->isDeclScope(PrevDecl)); 10759 if (PrevDecl->isTemplateParameter()) { 10760 // Maybe we will complain about the shadowed template parameter. 10761 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10762 PrevDecl = 0; 10763 } 10764 } 10765 10766 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10767 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10768 << D.getCXXScopeSpec().getRange(); 10769 Invalid = true; 10770 } 10771 10772 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10773 D.getLocStart(), 10774 D.getIdentifierLoc(), 10775 D.getIdentifier()); 10776 if (Invalid) 10777 ExDecl->setInvalidDecl(); 10778 10779 // Add the exception declaration into this scope. 10780 if (II) 10781 PushOnScopeChains(ExDecl, S); 10782 else 10783 CurContext->addDecl(ExDecl); 10784 10785 ProcessDeclAttributes(S, ExDecl, D); 10786 return ExDecl; 10787} 10788 10789Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10790 Expr *AssertExpr, 10791 Expr *AssertMessageExpr, 10792 SourceLocation RParenLoc) { 10793 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10794 10795 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10796 return 0; 10797 10798 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10799 AssertMessage, RParenLoc, false); 10800} 10801 10802Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10803 Expr *AssertExpr, 10804 StringLiteral *AssertMessage, 10805 SourceLocation RParenLoc, 10806 bool Failed) { 10807 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10808 !Failed) { 10809 // In a static_assert-declaration, the constant-expression shall be a 10810 // constant expression that can be contextually converted to bool. 10811 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10812 if (Converted.isInvalid()) 10813 Failed = true; 10814 10815 llvm::APSInt Cond; 10816 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10817 diag::err_static_assert_expression_is_not_constant, 10818 /*AllowFold=*/false).isInvalid()) 10819 Failed = true; 10820 10821 if (!Failed && !Cond) { 10822 SmallString<256> MsgBuffer; 10823 llvm::raw_svector_ostream Msg(MsgBuffer); 10824 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10825 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10826 << Msg.str() << AssertExpr->getSourceRange(); 10827 Failed = true; 10828 } 10829 } 10830 10831 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10832 AssertExpr, AssertMessage, RParenLoc, 10833 Failed); 10834 10835 CurContext->addDecl(Decl); 10836 return Decl; 10837} 10838 10839/// \brief Perform semantic analysis of the given friend type declaration. 10840/// 10841/// \returns A friend declaration that. 10842FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10843 SourceLocation FriendLoc, 10844 TypeSourceInfo *TSInfo) { 10845 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10846 10847 QualType T = TSInfo->getType(); 10848 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10849 10850 // C++03 [class.friend]p2: 10851 // An elaborated-type-specifier shall be used in a friend declaration 10852 // for a class.* 10853 // 10854 // * The class-key of the elaborated-type-specifier is required. 10855 if (!ActiveTemplateInstantiations.empty()) { 10856 // Do not complain about the form of friend template types during 10857 // template instantiation; we will already have complained when the 10858 // template was declared. 10859 } else { 10860 if (!T->isElaboratedTypeSpecifier()) { 10861 // If we evaluated the type to a record type, suggest putting 10862 // a tag in front. 10863 if (const RecordType *RT = T->getAs<RecordType>()) { 10864 RecordDecl *RD = RT->getDecl(); 10865 10866 std::string InsertionText = std::string(" ") + RD->getKindName(); 10867 10868 Diag(TypeRange.getBegin(), 10869 getLangOpts().CPlusPlus11 ? 10870 diag::warn_cxx98_compat_unelaborated_friend_type : 10871 diag::ext_unelaborated_friend_type) 10872 << (unsigned) RD->getTagKind() 10873 << T 10874 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10875 InsertionText); 10876 } else { 10877 Diag(FriendLoc, 10878 getLangOpts().CPlusPlus11 ? 10879 diag::warn_cxx98_compat_nonclass_type_friend : 10880 diag::ext_nonclass_type_friend) 10881 << T 10882 << TypeRange; 10883 } 10884 } else if (T->getAs<EnumType>()) { 10885 Diag(FriendLoc, 10886 getLangOpts().CPlusPlus11 ? 10887 diag::warn_cxx98_compat_enum_friend : 10888 diag::ext_enum_friend) 10889 << T 10890 << TypeRange; 10891 } 10892 10893 // C++11 [class.friend]p3: 10894 // A friend declaration that does not declare a function shall have one 10895 // of the following forms: 10896 // friend elaborated-type-specifier ; 10897 // friend simple-type-specifier ; 10898 // friend typename-specifier ; 10899 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10900 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10901 } 10902 10903 // If the type specifier in a friend declaration designates a (possibly 10904 // cv-qualified) class type, that class is declared as a friend; otherwise, 10905 // the friend declaration is ignored. 10906 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10907} 10908 10909/// Handle a friend tag declaration where the scope specifier was 10910/// templated. 10911Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10912 unsigned TagSpec, SourceLocation TagLoc, 10913 CXXScopeSpec &SS, 10914 IdentifierInfo *Name, 10915 SourceLocation NameLoc, 10916 AttributeList *Attr, 10917 MultiTemplateParamsArg TempParamLists) { 10918 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10919 10920 bool isExplicitSpecialization = false; 10921 bool Invalid = false; 10922 10923 if (TemplateParameterList *TemplateParams 10924 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10925 TempParamLists.data(), 10926 TempParamLists.size(), 10927 /*friend*/ true, 10928 isExplicitSpecialization, 10929 Invalid)) { 10930 if (TemplateParams->size() > 0) { 10931 // This is a declaration of a class template. 10932 if (Invalid) 10933 return 0; 10934 10935 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10936 SS, Name, NameLoc, Attr, 10937 TemplateParams, AS_public, 10938 /*ModulePrivateLoc=*/SourceLocation(), 10939 TempParamLists.size() - 1, 10940 TempParamLists.data()).take(); 10941 } else { 10942 // The "template<>" header is extraneous. 10943 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10944 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10945 isExplicitSpecialization = true; 10946 } 10947 } 10948 10949 if (Invalid) return 0; 10950 10951 bool isAllExplicitSpecializations = true; 10952 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10953 if (TempParamLists[I]->size()) { 10954 isAllExplicitSpecializations = false; 10955 break; 10956 } 10957 } 10958 10959 // FIXME: don't ignore attributes. 10960 10961 // If it's explicit specializations all the way down, just forget 10962 // about the template header and build an appropriate non-templated 10963 // friend. TODO: for source fidelity, remember the headers. 10964 if (isAllExplicitSpecializations) { 10965 if (SS.isEmpty()) { 10966 bool Owned = false; 10967 bool IsDependent = false; 10968 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10969 Attr, AS_public, 10970 /*ModulePrivateLoc=*/SourceLocation(), 10971 MultiTemplateParamsArg(), Owned, IsDependent, 10972 /*ScopedEnumKWLoc=*/SourceLocation(), 10973 /*ScopedEnumUsesClassTag=*/false, 10974 /*UnderlyingType=*/TypeResult()); 10975 } 10976 10977 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10978 ElaboratedTypeKeyword Keyword 10979 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10980 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10981 *Name, NameLoc); 10982 if (T.isNull()) 10983 return 0; 10984 10985 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10986 if (isa<DependentNameType>(T)) { 10987 DependentNameTypeLoc TL = 10988 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10989 TL.setElaboratedKeywordLoc(TagLoc); 10990 TL.setQualifierLoc(QualifierLoc); 10991 TL.setNameLoc(NameLoc); 10992 } else { 10993 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 10994 TL.setElaboratedKeywordLoc(TagLoc); 10995 TL.setQualifierLoc(QualifierLoc); 10996 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 10997 } 10998 10999 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11000 TSI, FriendLoc, TempParamLists); 11001 Friend->setAccess(AS_public); 11002 CurContext->addDecl(Friend); 11003 return Friend; 11004 } 11005 11006 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 11007 11008 11009 11010 // Handle the case of a templated-scope friend class. e.g. 11011 // template <class T> class A<T>::B; 11012 // FIXME: we don't support these right now. 11013 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 11014 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 11015 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 11016 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 11017 TL.setElaboratedKeywordLoc(TagLoc); 11018 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 11019 TL.setNameLoc(NameLoc); 11020 11021 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 11022 TSI, FriendLoc, TempParamLists); 11023 Friend->setAccess(AS_public); 11024 Friend->setUnsupportedFriend(true); 11025 CurContext->addDecl(Friend); 11026 return Friend; 11027} 11028 11029 11030/// Handle a friend type declaration. This works in tandem with 11031/// ActOnTag. 11032/// 11033/// Notes on friend class templates: 11034/// 11035/// We generally treat friend class declarations as if they were 11036/// declaring a class. So, for example, the elaborated type specifier 11037/// in a friend declaration is required to obey the restrictions of a 11038/// class-head (i.e. no typedefs in the scope chain), template 11039/// parameters are required to match up with simple template-ids, &c. 11040/// However, unlike when declaring a template specialization, it's 11041/// okay to refer to a template specialization without an empty 11042/// template parameter declaration, e.g. 11043/// friend class A<T>::B<unsigned>; 11044/// We permit this as a special case; if there are any template 11045/// parameters present at all, require proper matching, i.e. 11046/// template <> template \<class T> friend class A<int>::B; 11047Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 11048 MultiTemplateParamsArg TempParams) { 11049 SourceLocation Loc = DS.getLocStart(); 11050 11051 assert(DS.isFriendSpecified()); 11052 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11053 11054 // Try to convert the decl specifier to a type. This works for 11055 // friend templates because ActOnTag never produces a ClassTemplateDecl 11056 // for a TUK_Friend. 11057 Declarator TheDeclarator(DS, Declarator::MemberContext); 11058 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 11059 QualType T = TSI->getType(); 11060 if (TheDeclarator.isInvalidType()) 11061 return 0; 11062 11063 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 11064 return 0; 11065 11066 // This is definitely an error in C++98. It's probably meant to 11067 // be forbidden in C++0x, too, but the specification is just 11068 // poorly written. 11069 // 11070 // The problem is with declarations like the following: 11071 // template <T> friend A<T>::foo; 11072 // where deciding whether a class C is a friend or not now hinges 11073 // on whether there exists an instantiation of A that causes 11074 // 'foo' to equal C. There are restrictions on class-heads 11075 // (which we declare (by fiat) elaborated friend declarations to 11076 // be) that makes this tractable. 11077 // 11078 // FIXME: handle "template <> friend class A<T>;", which 11079 // is possibly well-formed? Who even knows? 11080 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 11081 Diag(Loc, diag::err_tagless_friend_type_template) 11082 << DS.getSourceRange(); 11083 return 0; 11084 } 11085 11086 // C++98 [class.friend]p1: A friend of a class is a function 11087 // or class that is not a member of the class . . . 11088 // This is fixed in DR77, which just barely didn't make the C++03 11089 // deadline. It's also a very silly restriction that seriously 11090 // affects inner classes and which nobody else seems to implement; 11091 // thus we never diagnose it, not even in -pedantic. 11092 // 11093 // But note that we could warn about it: it's always useless to 11094 // friend one of your own members (it's not, however, worthless to 11095 // friend a member of an arbitrary specialization of your template). 11096 11097 Decl *D; 11098 if (unsigned NumTempParamLists = TempParams.size()) 11099 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 11100 NumTempParamLists, 11101 TempParams.data(), 11102 TSI, 11103 DS.getFriendSpecLoc()); 11104 else 11105 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 11106 11107 if (!D) 11108 return 0; 11109 11110 D->setAccess(AS_public); 11111 CurContext->addDecl(D); 11112 11113 return D; 11114} 11115 11116NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 11117 MultiTemplateParamsArg TemplateParams) { 11118 const DeclSpec &DS = D.getDeclSpec(); 11119 11120 assert(DS.isFriendSpecified()); 11121 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 11122 11123 SourceLocation Loc = D.getIdentifierLoc(); 11124 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 11125 11126 // C++ [class.friend]p1 11127 // A friend of a class is a function or class.... 11128 // Note that this sees through typedefs, which is intended. 11129 // It *doesn't* see through dependent types, which is correct 11130 // according to [temp.arg.type]p3: 11131 // If a declaration acquires a function type through a 11132 // type dependent on a template-parameter and this causes 11133 // a declaration that does not use the syntactic form of a 11134 // function declarator to have a function type, the program 11135 // is ill-formed. 11136 if (!TInfo->getType()->isFunctionType()) { 11137 Diag(Loc, diag::err_unexpected_friend); 11138 11139 // It might be worthwhile to try to recover by creating an 11140 // appropriate declaration. 11141 return 0; 11142 } 11143 11144 // C++ [namespace.memdef]p3 11145 // - If a friend declaration in a non-local class first declares a 11146 // class or function, the friend class or function is a member 11147 // of the innermost enclosing namespace. 11148 // - The name of the friend is not found by simple name lookup 11149 // until a matching declaration is provided in that namespace 11150 // scope (either before or after the class declaration granting 11151 // friendship). 11152 // - If a friend function is called, its name may be found by the 11153 // name lookup that considers functions from namespaces and 11154 // classes associated with the types of the function arguments. 11155 // - When looking for a prior declaration of a class or a function 11156 // declared as a friend, scopes outside the innermost enclosing 11157 // namespace scope are not considered. 11158 11159 CXXScopeSpec &SS = D.getCXXScopeSpec(); 11160 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 11161 DeclarationName Name = NameInfo.getName(); 11162 assert(Name); 11163 11164 // Check for unexpanded parameter packs. 11165 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 11166 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 11167 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 11168 return 0; 11169 11170 // The context we found the declaration in, or in which we should 11171 // create the declaration. 11172 DeclContext *DC; 11173 Scope *DCScope = S; 11174 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 11175 ForRedeclaration); 11176 11177 // FIXME: there are different rules in local classes 11178 11179 // There are four cases here. 11180 // - There's no scope specifier, in which case we just go to the 11181 // appropriate scope and look for a function or function template 11182 // there as appropriate. 11183 // Recover from invalid scope qualifiers as if they just weren't there. 11184 if (SS.isInvalid() || !SS.isSet()) { 11185 // C++0x [namespace.memdef]p3: 11186 // If the name in a friend declaration is neither qualified nor 11187 // a template-id and the declaration is a function or an 11188 // elaborated-type-specifier, the lookup to determine whether 11189 // the entity has been previously declared shall not consider 11190 // any scopes outside the innermost enclosing namespace. 11191 // C++0x [class.friend]p11: 11192 // If a friend declaration appears in a local class and the name 11193 // specified is an unqualified name, a prior declaration is 11194 // looked up without considering scopes that are outside the 11195 // innermost enclosing non-class scope. For a friend function 11196 // declaration, if there is no prior declaration, the program is 11197 // ill-formed. 11198 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 11199 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 11200 11201 // Find the appropriate context according to the above. 11202 DC = CurContext; 11203 11204 // Skip class contexts. If someone can cite chapter and verse 11205 // for this behavior, that would be nice --- it's what GCC and 11206 // EDG do, and it seems like a reasonable intent, but the spec 11207 // really only says that checks for unqualified existing 11208 // declarations should stop at the nearest enclosing namespace, 11209 // not that they should only consider the nearest enclosing 11210 // namespace. 11211 while (DC->isRecord()) 11212 DC = DC->getParent(); 11213 11214 DeclContext *LookupDC = DC; 11215 while (LookupDC->isTransparentContext()) 11216 LookupDC = LookupDC->getParent(); 11217 11218 while (true) { 11219 LookupQualifiedName(Previous, LookupDC); 11220 11221 // TODO: decide what we think about using declarations. 11222 if (isLocal) 11223 break; 11224 11225 if (!Previous.empty()) { 11226 DC = LookupDC; 11227 break; 11228 } 11229 11230 if (isTemplateId) { 11231 if (isa<TranslationUnitDecl>(LookupDC)) break; 11232 } else { 11233 if (LookupDC->isFileContext()) break; 11234 } 11235 LookupDC = LookupDC->getParent(); 11236 } 11237 11238 DCScope = getScopeForDeclContext(S, DC); 11239 11240 // C++ [class.friend]p6: 11241 // A function can be defined in a friend declaration of a class if and 11242 // only if the class is a non-local class (9.8), the function name is 11243 // unqualified, and the function has namespace scope. 11244 if (isLocal && D.isFunctionDefinition()) { 11245 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11246 } 11247 11248 // - There's a non-dependent scope specifier, in which case we 11249 // compute it and do a previous lookup there for a function 11250 // or function template. 11251 } else if (!SS.getScopeRep()->isDependent()) { 11252 DC = computeDeclContext(SS); 11253 if (!DC) return 0; 11254 11255 if (RequireCompleteDeclContext(SS, DC)) return 0; 11256 11257 LookupQualifiedName(Previous, DC); 11258 11259 // Ignore things found implicitly in the wrong scope. 11260 // TODO: better diagnostics for this case. Suggesting the right 11261 // qualified scope would be nice... 11262 LookupResult::Filter F = Previous.makeFilter(); 11263 while (F.hasNext()) { 11264 NamedDecl *D = F.next(); 11265 if (!DC->InEnclosingNamespaceSetOf( 11266 D->getDeclContext()->getRedeclContext())) 11267 F.erase(); 11268 } 11269 F.done(); 11270 11271 if (Previous.empty()) { 11272 D.setInvalidType(); 11273 Diag(Loc, diag::err_qualified_friend_not_found) 11274 << Name << TInfo->getType(); 11275 return 0; 11276 } 11277 11278 // C++ [class.friend]p1: A friend of a class is a function or 11279 // class that is not a member of the class . . . 11280 if (DC->Equals(CurContext)) 11281 Diag(DS.getFriendSpecLoc(), 11282 getLangOpts().CPlusPlus11 ? 11283 diag::warn_cxx98_compat_friend_is_member : 11284 diag::err_friend_is_member); 11285 11286 if (D.isFunctionDefinition()) { 11287 // C++ [class.friend]p6: 11288 // A function can be defined in a friend declaration of a class if and 11289 // only if the class is a non-local class (9.8), the function name is 11290 // unqualified, and the function has namespace scope. 11291 SemaDiagnosticBuilder DB 11292 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11293 11294 DB << SS.getScopeRep(); 11295 if (DC->isFileContext()) 11296 DB << FixItHint::CreateRemoval(SS.getRange()); 11297 SS.clear(); 11298 } 11299 11300 // - There's a scope specifier that does not match any template 11301 // parameter lists, in which case we use some arbitrary context, 11302 // create a method or method template, and wait for instantiation. 11303 // - There's a scope specifier that does match some template 11304 // parameter lists, which we don't handle right now. 11305 } else { 11306 if (D.isFunctionDefinition()) { 11307 // C++ [class.friend]p6: 11308 // A function can be defined in a friend declaration of a class if and 11309 // only if the class is a non-local class (9.8), the function name is 11310 // unqualified, and the function has namespace scope. 11311 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11312 << SS.getScopeRep(); 11313 } 11314 11315 DC = CurContext; 11316 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11317 } 11318 11319 if (!DC->isRecord()) { 11320 // This implies that it has to be an operator or function. 11321 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11322 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11323 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11324 Diag(Loc, diag::err_introducing_special_friend) << 11325 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11326 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11327 return 0; 11328 } 11329 } 11330 11331 // FIXME: This is an egregious hack to cope with cases where the scope stack 11332 // does not contain the declaration context, i.e., in an out-of-line 11333 // definition of a class. 11334 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11335 if (!DCScope) { 11336 FakeDCScope.setEntity(DC); 11337 DCScope = &FakeDCScope; 11338 } 11339 11340 bool AddToScope = true; 11341 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11342 TemplateParams, AddToScope); 11343 if (!ND) return 0; 11344 11345 assert(ND->getDeclContext() == DC); 11346 assert(ND->getLexicalDeclContext() == CurContext); 11347 11348 // Add the function declaration to the appropriate lookup tables, 11349 // adjusting the redeclarations list as necessary. We don't 11350 // want to do this yet if the friending class is dependent. 11351 // 11352 // Also update the scope-based lookup if the target context's 11353 // lookup context is in lexical scope. 11354 if (!CurContext->isDependentContext()) { 11355 DC = DC->getRedeclContext(); 11356 DC->makeDeclVisibleInContext(ND); 11357 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11358 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11359 } 11360 11361 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11362 D.getIdentifierLoc(), ND, 11363 DS.getFriendSpecLoc()); 11364 FrD->setAccess(AS_public); 11365 CurContext->addDecl(FrD); 11366 11367 if (ND->isInvalidDecl()) { 11368 FrD->setInvalidDecl(); 11369 } else { 11370 if (DC->isRecord()) CheckFriendAccess(ND); 11371 11372 FunctionDecl *FD; 11373 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11374 FD = FTD->getTemplatedDecl(); 11375 else 11376 FD = cast<FunctionDecl>(ND); 11377 11378 // Mark templated-scope function declarations as unsupported. 11379 if (FD->getNumTemplateParameterLists()) 11380 FrD->setUnsupportedFriend(true); 11381 } 11382 11383 return ND; 11384} 11385 11386void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11387 AdjustDeclIfTemplate(Dcl); 11388 11389 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11390 if (!Fn) { 11391 Diag(DelLoc, diag::err_deleted_non_function); 11392 return; 11393 } 11394 11395 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11396 // Don't consider the implicit declaration we generate for explicit 11397 // specializations. FIXME: Do not generate these implicit declarations. 11398 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11399 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11400 Diag(DelLoc, diag::err_deleted_decl_not_first); 11401 Diag(Prev->getLocation(), diag::note_previous_declaration); 11402 } 11403 // If the declaration wasn't the first, we delete the function anyway for 11404 // recovery. 11405 Fn = Fn->getCanonicalDecl(); 11406 } 11407 11408 if (Fn->isDeleted()) 11409 return; 11410 11411 // See if we're deleting a function which is already known to override a 11412 // non-deleted virtual function. 11413 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11414 bool IssuedDiagnostic = false; 11415 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11416 E = MD->end_overridden_methods(); 11417 I != E; ++I) { 11418 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11419 if (!IssuedDiagnostic) { 11420 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11421 IssuedDiagnostic = true; 11422 } 11423 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11424 } 11425 } 11426 } 11427 11428 Fn->setDeletedAsWritten(); 11429} 11430 11431void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11432 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11433 11434 if (MD) { 11435 if (MD->getParent()->isDependentType()) { 11436 MD->setDefaulted(); 11437 MD->setExplicitlyDefaulted(); 11438 return; 11439 } 11440 11441 CXXSpecialMember Member = getSpecialMember(MD); 11442 if (Member == CXXInvalid) { 11443 Diag(DefaultLoc, diag::err_default_special_members); 11444 return; 11445 } 11446 11447 MD->setDefaulted(); 11448 MD->setExplicitlyDefaulted(); 11449 11450 // If this definition appears within the record, do the checking when 11451 // the record is complete. 11452 const FunctionDecl *Primary = MD; 11453 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11454 // Find the uninstantiated declaration that actually had the '= default' 11455 // on it. 11456 Pattern->isDefined(Primary); 11457 11458 // If the method was defaulted on its first declaration, we will have 11459 // already performed the checking in CheckCompletedCXXClass. Such a 11460 // declaration doesn't trigger an implicit definition. 11461 if (Primary == Primary->getCanonicalDecl()) 11462 return; 11463 11464 CheckExplicitlyDefaultedSpecialMember(MD); 11465 11466 // The exception specification is needed because we are defining the 11467 // function. 11468 ResolveExceptionSpec(DefaultLoc, 11469 MD->getType()->castAs<FunctionProtoType>()); 11470 11471 switch (Member) { 11472 case CXXDefaultConstructor: { 11473 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11474 if (!CD->isInvalidDecl()) 11475 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11476 break; 11477 } 11478 11479 case CXXCopyConstructor: { 11480 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11481 if (!CD->isInvalidDecl()) 11482 DefineImplicitCopyConstructor(DefaultLoc, CD); 11483 break; 11484 } 11485 11486 case CXXCopyAssignment: { 11487 if (!MD->isInvalidDecl()) 11488 DefineImplicitCopyAssignment(DefaultLoc, MD); 11489 break; 11490 } 11491 11492 case CXXDestructor: { 11493 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11494 if (!DD->isInvalidDecl()) 11495 DefineImplicitDestructor(DefaultLoc, DD); 11496 break; 11497 } 11498 11499 case CXXMoveConstructor: { 11500 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11501 if (!CD->isInvalidDecl()) 11502 DefineImplicitMoveConstructor(DefaultLoc, CD); 11503 break; 11504 } 11505 11506 case CXXMoveAssignment: { 11507 if (!MD->isInvalidDecl()) 11508 DefineImplicitMoveAssignment(DefaultLoc, MD); 11509 break; 11510 } 11511 11512 case CXXInvalid: 11513 llvm_unreachable("Invalid special member."); 11514 } 11515 } else { 11516 Diag(DefaultLoc, diag::err_default_special_members); 11517 } 11518} 11519 11520static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11521 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11522 Stmt *SubStmt = *CI; 11523 if (!SubStmt) 11524 continue; 11525 if (isa<ReturnStmt>(SubStmt)) 11526 Self.Diag(SubStmt->getLocStart(), 11527 diag::err_return_in_constructor_handler); 11528 if (!isa<Expr>(SubStmt)) 11529 SearchForReturnInStmt(Self, SubStmt); 11530 } 11531} 11532 11533void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11534 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11535 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11536 SearchForReturnInStmt(*this, Handler); 11537 } 11538} 11539 11540bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11541 const CXXMethodDecl *Old) { 11542 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11543 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11544 11545 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11546 11547 // If the calling conventions match, everything is fine 11548 if (NewCC == OldCC) 11549 return false; 11550 11551 // If either of the calling conventions are set to "default", we need to pick 11552 // something more sensible based on the target. This supports code where the 11553 // one method explicitly sets thiscall, and another has no explicit calling 11554 // convention. 11555 CallingConv Default = 11556 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11557 if (NewCC == CC_Default) 11558 NewCC = Default; 11559 if (OldCC == CC_Default) 11560 OldCC = Default; 11561 11562 // If the calling conventions still don't match, then report the error 11563 if (NewCC != OldCC) { 11564 Diag(New->getLocation(), 11565 diag::err_conflicting_overriding_cc_attributes) 11566 << New->getDeclName() << New->getType() << Old->getType(); 11567 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11568 return true; 11569 } 11570 11571 return false; 11572} 11573 11574bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11575 const CXXMethodDecl *Old) { 11576 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11577 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11578 11579 if (Context.hasSameType(NewTy, OldTy) || 11580 NewTy->isDependentType() || OldTy->isDependentType()) 11581 return false; 11582 11583 // Check if the return types are covariant 11584 QualType NewClassTy, OldClassTy; 11585 11586 /// Both types must be pointers or references to classes. 11587 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11588 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11589 NewClassTy = NewPT->getPointeeType(); 11590 OldClassTy = OldPT->getPointeeType(); 11591 } 11592 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11593 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11594 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11595 NewClassTy = NewRT->getPointeeType(); 11596 OldClassTy = OldRT->getPointeeType(); 11597 } 11598 } 11599 } 11600 11601 // The return types aren't either both pointers or references to a class type. 11602 if (NewClassTy.isNull()) { 11603 Diag(New->getLocation(), 11604 diag::err_different_return_type_for_overriding_virtual_function) 11605 << New->getDeclName() << NewTy << OldTy; 11606 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11607 11608 return true; 11609 } 11610 11611 // C++ [class.virtual]p6: 11612 // If the return type of D::f differs from the return type of B::f, the 11613 // class type in the return type of D::f shall be complete at the point of 11614 // declaration of D::f or shall be the class type D. 11615 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11616 if (!RT->isBeingDefined() && 11617 RequireCompleteType(New->getLocation(), NewClassTy, 11618 diag::err_covariant_return_incomplete, 11619 New->getDeclName())) 11620 return true; 11621 } 11622 11623 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11624 // Check if the new class derives from the old class. 11625 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11626 Diag(New->getLocation(), 11627 diag::err_covariant_return_not_derived) 11628 << New->getDeclName() << NewTy << OldTy; 11629 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11630 return true; 11631 } 11632 11633 // Check if we the conversion from derived to base is valid. 11634 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11635 diag::err_covariant_return_inaccessible_base, 11636 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11637 // FIXME: Should this point to the return type? 11638 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11639 // FIXME: this note won't trigger for delayed access control 11640 // diagnostics, and it's impossible to get an undelayed error 11641 // here from access control during the original parse because 11642 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11643 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11644 return true; 11645 } 11646 } 11647 11648 // The qualifiers of the return types must be the same. 11649 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11650 Diag(New->getLocation(), 11651 diag::err_covariant_return_type_different_qualifications) 11652 << New->getDeclName() << NewTy << OldTy; 11653 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11654 return true; 11655 }; 11656 11657 11658 // The new class type must have the same or less qualifiers as the old type. 11659 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11660 Diag(New->getLocation(), 11661 diag::err_covariant_return_type_class_type_more_qualified) 11662 << New->getDeclName() << NewTy << OldTy; 11663 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11664 return true; 11665 }; 11666 11667 return false; 11668} 11669 11670/// \brief Mark the given method pure. 11671/// 11672/// \param Method the method to be marked pure. 11673/// 11674/// \param InitRange the source range that covers the "0" initializer. 11675bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11676 SourceLocation EndLoc = InitRange.getEnd(); 11677 if (EndLoc.isValid()) 11678 Method->setRangeEnd(EndLoc); 11679 11680 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11681 Method->setPure(); 11682 return false; 11683 } 11684 11685 if (!Method->isInvalidDecl()) 11686 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11687 << Method->getDeclName() << InitRange; 11688 return true; 11689} 11690 11691/// \brief Determine whether the given declaration is a static data member. 11692static bool isStaticDataMember(Decl *D) { 11693 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11694 if (!Var) 11695 return false; 11696 11697 return Var->isStaticDataMember(); 11698} 11699/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11700/// an initializer for the out-of-line declaration 'Dcl'. The scope 11701/// is a fresh scope pushed for just this purpose. 11702/// 11703/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11704/// static data member of class X, names should be looked up in the scope of 11705/// class X. 11706void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11707 // If there is no declaration, there was an error parsing it. 11708 if (D == 0 || D->isInvalidDecl()) return; 11709 11710 // We should only get called for declarations with scope specifiers, like: 11711 // int foo::bar; 11712 assert(D->isOutOfLine()); 11713 EnterDeclaratorContext(S, D->getDeclContext()); 11714 11715 // If we are parsing the initializer for a static data member, push a 11716 // new expression evaluation context that is associated with this static 11717 // data member. 11718 if (isStaticDataMember(D)) 11719 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11720} 11721 11722/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11723/// initializer for the out-of-line declaration 'D'. 11724void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11725 // If there is no declaration, there was an error parsing it. 11726 if (D == 0 || D->isInvalidDecl()) return; 11727 11728 if (isStaticDataMember(D)) 11729 PopExpressionEvaluationContext(); 11730 11731 assert(D->isOutOfLine()); 11732 ExitDeclaratorContext(S); 11733} 11734 11735/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11736/// C++ if/switch/while/for statement. 11737/// e.g: "if (int x = f()) {...}" 11738DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11739 // C++ 6.4p2: 11740 // The declarator shall not specify a function or an array. 11741 // The type-specifier-seq shall not contain typedef and shall not declare a 11742 // new class or enumeration. 11743 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11744 "Parser allowed 'typedef' as storage class of condition decl."); 11745 11746 Decl *Dcl = ActOnDeclarator(S, D); 11747 if (!Dcl) 11748 return true; 11749 11750 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11751 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11752 << D.getSourceRange(); 11753 return true; 11754 } 11755 11756 return Dcl; 11757} 11758 11759void Sema::LoadExternalVTableUses() { 11760 if (!ExternalSource) 11761 return; 11762 11763 SmallVector<ExternalVTableUse, 4> VTables; 11764 ExternalSource->ReadUsedVTables(VTables); 11765 SmallVector<VTableUse, 4> NewUses; 11766 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11767 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11768 = VTablesUsed.find(VTables[I].Record); 11769 // Even if a definition wasn't required before, it may be required now. 11770 if (Pos != VTablesUsed.end()) { 11771 if (!Pos->second && VTables[I].DefinitionRequired) 11772 Pos->second = true; 11773 continue; 11774 } 11775 11776 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11777 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11778 } 11779 11780 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11781} 11782 11783void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11784 bool DefinitionRequired) { 11785 // Ignore any vtable uses in unevaluated operands or for classes that do 11786 // not have a vtable. 11787 if (!Class->isDynamicClass() || Class->isDependentContext() || 11788 CurContext->isDependentContext() || isUnevaluatedContext()) 11789 return; 11790 11791 // Try to insert this class into the map. 11792 LoadExternalVTableUses(); 11793 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11794 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11795 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11796 if (!Pos.second) { 11797 // If we already had an entry, check to see if we are promoting this vtable 11798 // to required a definition. If so, we need to reappend to the VTableUses 11799 // list, since we may have already processed the first entry. 11800 if (DefinitionRequired && !Pos.first->second) { 11801 Pos.first->second = true; 11802 } else { 11803 // Otherwise, we can early exit. 11804 return; 11805 } 11806 } 11807 11808 // Local classes need to have their virtual members marked 11809 // immediately. For all other classes, we mark their virtual members 11810 // at the end of the translation unit. 11811 if (Class->isLocalClass()) 11812 MarkVirtualMembersReferenced(Loc, Class); 11813 else 11814 VTableUses.push_back(std::make_pair(Class, Loc)); 11815} 11816 11817bool Sema::DefineUsedVTables() { 11818 LoadExternalVTableUses(); 11819 if (VTableUses.empty()) 11820 return false; 11821 11822 // Note: The VTableUses vector could grow as a result of marking 11823 // the members of a class as "used", so we check the size each 11824 // time through the loop and prefer indices (which are stable) to 11825 // iterators (which are not). 11826 bool DefinedAnything = false; 11827 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11828 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11829 if (!Class) 11830 continue; 11831 11832 SourceLocation Loc = VTableUses[I].second; 11833 11834 bool DefineVTable = true; 11835 11836 // If this class has a key function, but that key function is 11837 // defined in another translation unit, we don't need to emit the 11838 // vtable even though we're using it. 11839 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11840 if (KeyFunction && !KeyFunction->hasBody()) { 11841 switch (KeyFunction->getTemplateSpecializationKind()) { 11842 case TSK_Undeclared: 11843 case TSK_ExplicitSpecialization: 11844 case TSK_ExplicitInstantiationDeclaration: 11845 // The key function is in another translation unit. 11846 DefineVTable = false; 11847 break; 11848 11849 case TSK_ExplicitInstantiationDefinition: 11850 case TSK_ImplicitInstantiation: 11851 // We will be instantiating the key function. 11852 break; 11853 } 11854 } else if (!KeyFunction) { 11855 // If we have a class with no key function that is the subject 11856 // of an explicit instantiation declaration, suppress the 11857 // vtable; it will live with the explicit instantiation 11858 // definition. 11859 bool IsExplicitInstantiationDeclaration 11860 = Class->getTemplateSpecializationKind() 11861 == TSK_ExplicitInstantiationDeclaration; 11862 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11863 REnd = Class->redecls_end(); 11864 R != REnd; ++R) { 11865 TemplateSpecializationKind TSK 11866 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11867 if (TSK == TSK_ExplicitInstantiationDeclaration) 11868 IsExplicitInstantiationDeclaration = true; 11869 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11870 IsExplicitInstantiationDeclaration = false; 11871 break; 11872 } 11873 } 11874 11875 if (IsExplicitInstantiationDeclaration) 11876 DefineVTable = false; 11877 } 11878 11879 // The exception specifications for all virtual members may be needed even 11880 // if we are not providing an authoritative form of the vtable in this TU. 11881 // We may choose to emit it available_externally anyway. 11882 if (!DefineVTable) { 11883 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11884 continue; 11885 } 11886 11887 // Mark all of the virtual members of this class as referenced, so 11888 // that we can build a vtable. Then, tell the AST consumer that a 11889 // vtable for this class is required. 11890 DefinedAnything = true; 11891 MarkVirtualMembersReferenced(Loc, Class); 11892 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11893 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11894 11895 // Optionally warn if we're emitting a weak vtable. 11896 if (Class->isExternallyVisible() && 11897 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11898 const FunctionDecl *KeyFunctionDef = 0; 11899 if (!KeyFunction || 11900 (KeyFunction->hasBody(KeyFunctionDef) && 11901 KeyFunctionDef->isInlined())) 11902 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11903 TSK_ExplicitInstantiationDefinition 11904 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11905 << Class; 11906 } 11907 } 11908 VTableUses.clear(); 11909 11910 return DefinedAnything; 11911} 11912 11913void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11914 const CXXRecordDecl *RD) { 11915 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11916 E = RD->method_end(); I != E; ++I) 11917 if ((*I)->isVirtual() && !(*I)->isPure()) 11918 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11919} 11920 11921void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11922 const CXXRecordDecl *RD) { 11923 // Mark all functions which will appear in RD's vtable as used. 11924 CXXFinalOverriderMap FinalOverriders; 11925 RD->getFinalOverriders(FinalOverriders); 11926 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11927 E = FinalOverriders.end(); 11928 I != E; ++I) { 11929 for (OverridingMethods::const_iterator OI = I->second.begin(), 11930 OE = I->second.end(); 11931 OI != OE; ++OI) { 11932 assert(OI->second.size() > 0 && "no final overrider"); 11933 CXXMethodDecl *Overrider = OI->second.front().Method; 11934 11935 // C++ [basic.def.odr]p2: 11936 // [...] A virtual member function is used if it is not pure. [...] 11937 if (!Overrider->isPure()) 11938 MarkFunctionReferenced(Loc, Overrider); 11939 } 11940 } 11941 11942 // Only classes that have virtual bases need a VTT. 11943 if (RD->getNumVBases() == 0) 11944 return; 11945 11946 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11947 e = RD->bases_end(); i != e; ++i) { 11948 const CXXRecordDecl *Base = 11949 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11950 if (Base->getNumVBases() == 0) 11951 continue; 11952 MarkVirtualMembersReferenced(Loc, Base); 11953 } 11954} 11955 11956/// SetIvarInitializers - This routine builds initialization ASTs for the 11957/// Objective-C implementation whose ivars need be initialized. 11958void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11959 if (!getLangOpts().CPlusPlus) 11960 return; 11961 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11962 SmallVector<ObjCIvarDecl*, 8> ivars; 11963 CollectIvarsToConstructOrDestruct(OID, ivars); 11964 if (ivars.empty()) 11965 return; 11966 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11967 for (unsigned i = 0; i < ivars.size(); i++) { 11968 FieldDecl *Field = ivars[i]; 11969 if (Field->isInvalidDecl()) 11970 continue; 11971 11972 CXXCtorInitializer *Member; 11973 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11974 InitializationKind InitKind = 11975 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11976 11977 InitializationSequence InitSeq(*this, InitEntity, InitKind, None); 11978 ExprResult MemberInit = 11979 InitSeq.Perform(*this, InitEntity, InitKind, None); 11980 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11981 // Note, MemberInit could actually come back empty if no initialization 11982 // is required (e.g., because it would call a trivial default constructor) 11983 if (!MemberInit.get() || MemberInit.isInvalid()) 11984 continue; 11985 11986 Member = 11987 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11988 SourceLocation(), 11989 MemberInit.takeAs<Expr>(), 11990 SourceLocation()); 11991 AllToInit.push_back(Member); 11992 11993 // Be sure that the destructor is accessible and is marked as referenced. 11994 if (const RecordType *RecordTy 11995 = Context.getBaseElementType(Field->getType()) 11996 ->getAs<RecordType>()) { 11997 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11998 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11999 MarkFunctionReferenced(Field->getLocation(), Destructor); 12000 CheckDestructorAccess(Field->getLocation(), Destructor, 12001 PDiag(diag::err_access_dtor_ivar) 12002 << Context.getBaseElementType(Field->getType())); 12003 } 12004 } 12005 } 12006 ObjCImplementation->setIvarInitializers(Context, 12007 AllToInit.data(), AllToInit.size()); 12008 } 12009} 12010 12011static 12012void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 12013 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 12014 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 12015 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 12016 Sema &S) { 12017 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 12018 CE = Current.end(); 12019 if (Ctor->isInvalidDecl()) 12020 return; 12021 12022 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 12023 12024 // Target may not be determinable yet, for instance if this is a dependent 12025 // call in an uninstantiated template. 12026 if (Target) { 12027 const FunctionDecl *FNTarget = 0; 12028 (void)Target->hasBody(FNTarget); 12029 Target = const_cast<CXXConstructorDecl*>( 12030 cast_or_null<CXXConstructorDecl>(FNTarget)); 12031 } 12032 12033 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 12034 // Avoid dereferencing a null pointer here. 12035 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 12036 12037 if (!Current.insert(Canonical)) 12038 return; 12039 12040 // We know that beyond here, we aren't chaining into a cycle. 12041 if (!Target || !Target->isDelegatingConstructor() || 12042 Target->isInvalidDecl() || Valid.count(TCanonical)) { 12043 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 12044 Valid.insert(*CI); 12045 Current.clear(); 12046 // We've hit a cycle. 12047 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 12048 Current.count(TCanonical)) { 12049 // If we haven't diagnosed this cycle yet, do so now. 12050 if (!Invalid.count(TCanonical)) { 12051 S.Diag((*Ctor->init_begin())->getSourceLocation(), 12052 diag::warn_delegating_ctor_cycle) 12053 << Ctor; 12054 12055 // Don't add a note for a function delegating directly to itself. 12056 if (TCanonical != Canonical) 12057 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 12058 12059 CXXConstructorDecl *C = Target; 12060 while (C->getCanonicalDecl() != Canonical) { 12061 const FunctionDecl *FNTarget = 0; 12062 (void)C->getTargetConstructor()->hasBody(FNTarget); 12063 assert(FNTarget && "Ctor cycle through bodiless function"); 12064 12065 C = const_cast<CXXConstructorDecl*>( 12066 cast<CXXConstructorDecl>(FNTarget)); 12067 S.Diag(C->getLocation(), diag::note_which_delegates_to); 12068 } 12069 } 12070 12071 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 12072 Invalid.insert(*CI); 12073 Current.clear(); 12074 } else { 12075 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 12076 } 12077} 12078 12079 12080void Sema::CheckDelegatingCtorCycles() { 12081 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 12082 12083 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 12084 CE = Current.end(); 12085 12086 for (DelegatingCtorDeclsType::iterator 12087 I = DelegatingCtorDecls.begin(ExternalSource), 12088 E = DelegatingCtorDecls.end(); 12089 I != E; ++I) 12090 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 12091 12092 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 12093 (*CI)->setInvalidDecl(); 12094} 12095 12096namespace { 12097 /// \brief AST visitor that finds references to the 'this' expression. 12098 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 12099 Sema &S; 12100 12101 public: 12102 explicit FindCXXThisExpr(Sema &S) : S(S) { } 12103 12104 bool VisitCXXThisExpr(CXXThisExpr *E) { 12105 S.Diag(E->getLocation(), diag::err_this_static_member_func) 12106 << E->isImplicit(); 12107 return false; 12108 } 12109 }; 12110} 12111 12112bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 12113 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12114 if (!TSInfo) 12115 return false; 12116 12117 TypeLoc TL = TSInfo->getTypeLoc(); 12118 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12119 if (!ProtoTL) 12120 return false; 12121 12122 // C++11 [expr.prim.general]p3: 12123 // [The expression this] shall not appear before the optional 12124 // cv-qualifier-seq and it shall not appear within the declaration of a 12125 // static member function (although its type and value category are defined 12126 // within a static member function as they are within a non-static member 12127 // function). [ Note: this is because declaration matching does not occur 12128 // until the complete declarator is known. - end note ] 12129 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12130 FindCXXThisExpr Finder(*this); 12131 12132 // If the return type came after the cv-qualifier-seq, check it now. 12133 if (Proto->hasTrailingReturn() && 12134 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 12135 return true; 12136 12137 // Check the exception specification. 12138 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 12139 return true; 12140 12141 return checkThisInStaticMemberFunctionAttributes(Method); 12142} 12143 12144bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 12145 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 12146 if (!TSInfo) 12147 return false; 12148 12149 TypeLoc TL = TSInfo->getTypeLoc(); 12150 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 12151 if (!ProtoTL) 12152 return false; 12153 12154 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 12155 FindCXXThisExpr Finder(*this); 12156 12157 switch (Proto->getExceptionSpecType()) { 12158 case EST_Uninstantiated: 12159 case EST_Unevaluated: 12160 case EST_BasicNoexcept: 12161 case EST_DynamicNone: 12162 case EST_MSAny: 12163 case EST_None: 12164 break; 12165 12166 case EST_ComputedNoexcept: 12167 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 12168 return true; 12169 12170 case EST_Dynamic: 12171 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 12172 EEnd = Proto->exception_end(); 12173 E != EEnd; ++E) { 12174 if (!Finder.TraverseType(*E)) 12175 return true; 12176 } 12177 break; 12178 } 12179 12180 return false; 12181} 12182 12183bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 12184 FindCXXThisExpr Finder(*this); 12185 12186 // Check attributes. 12187 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 12188 A != AEnd; ++A) { 12189 // FIXME: This should be emitted by tblgen. 12190 Expr *Arg = 0; 12191 ArrayRef<Expr *> Args; 12192 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 12193 Arg = G->getArg(); 12194 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 12195 Arg = G->getArg(); 12196 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 12197 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 12198 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 12199 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 12200 else if (ExclusiveLockFunctionAttr *ELF 12201 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 12202 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 12203 else if (SharedLockFunctionAttr *SLF 12204 = dyn_cast<SharedLockFunctionAttr>(*A)) 12205 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 12206 else if (ExclusiveTrylockFunctionAttr *ETLF 12207 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 12208 Arg = ETLF->getSuccessValue(); 12209 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 12210 } else if (SharedTrylockFunctionAttr *STLF 12211 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 12212 Arg = STLF->getSuccessValue(); 12213 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 12214 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 12215 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 12216 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 12217 Arg = LR->getArg(); 12218 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 12219 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 12220 else if (ExclusiveLocksRequiredAttr *ELR 12221 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 12222 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 12223 else if (SharedLocksRequiredAttr *SLR 12224 = dyn_cast<SharedLocksRequiredAttr>(*A)) 12225 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 12226 12227 if (Arg && !Finder.TraverseStmt(Arg)) 12228 return true; 12229 12230 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 12231 if (!Finder.TraverseStmt(Args[I])) 12232 return true; 12233 } 12234 } 12235 12236 return false; 12237} 12238 12239void 12240Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12241 ArrayRef<ParsedType> DynamicExceptions, 12242 ArrayRef<SourceRange> DynamicExceptionRanges, 12243 Expr *NoexceptExpr, 12244 SmallVectorImpl<QualType> &Exceptions, 12245 FunctionProtoType::ExtProtoInfo &EPI) { 12246 Exceptions.clear(); 12247 EPI.ExceptionSpecType = EST; 12248 if (EST == EST_Dynamic) { 12249 Exceptions.reserve(DynamicExceptions.size()); 12250 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12251 // FIXME: Preserve type source info. 12252 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12253 12254 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12255 collectUnexpandedParameterPacks(ET, Unexpanded); 12256 if (!Unexpanded.empty()) { 12257 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12258 UPPC_ExceptionType, 12259 Unexpanded); 12260 continue; 12261 } 12262 12263 // Check that the type is valid for an exception spec, and 12264 // drop it if not. 12265 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12266 Exceptions.push_back(ET); 12267 } 12268 EPI.NumExceptions = Exceptions.size(); 12269 EPI.Exceptions = Exceptions.data(); 12270 return; 12271 } 12272 12273 if (EST == EST_ComputedNoexcept) { 12274 // If an error occurred, there's no expression here. 12275 if (NoexceptExpr) { 12276 assert((NoexceptExpr->isTypeDependent() || 12277 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12278 Context.BoolTy) && 12279 "Parser should have made sure that the expression is boolean"); 12280 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12281 EPI.ExceptionSpecType = EST_BasicNoexcept; 12282 return; 12283 } 12284 12285 if (!NoexceptExpr->isValueDependent()) 12286 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12287 diag::err_noexcept_needs_constant_expression, 12288 /*AllowFold*/ false).take(); 12289 EPI.NoexceptExpr = NoexceptExpr; 12290 } 12291 return; 12292 } 12293} 12294 12295/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12296Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12297 // Implicitly declared functions (e.g. copy constructors) are 12298 // __host__ __device__ 12299 if (D->isImplicit()) 12300 return CFT_HostDevice; 12301 12302 if (D->hasAttr<CUDAGlobalAttr>()) 12303 return CFT_Global; 12304 12305 if (D->hasAttr<CUDADeviceAttr>()) { 12306 if (D->hasAttr<CUDAHostAttr>()) 12307 return CFT_HostDevice; 12308 else 12309 return CFT_Device; 12310 } 12311 12312 return CFT_Host; 12313} 12314 12315bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12316 CUDAFunctionTarget CalleeTarget) { 12317 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12318 // Callable from the device only." 12319 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12320 return true; 12321 12322 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12323 // Callable from the host only." 12324 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12325 // Callable from the host only." 12326 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12327 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12328 return true; 12329 12330 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12331 return true; 12332 12333 return false; 12334} 12335 12336/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12337/// 12338MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12339 SourceLocation DeclStart, 12340 Declarator &D, Expr *BitWidth, 12341 InClassInitStyle InitStyle, 12342 AccessSpecifier AS, 12343 AttributeList *MSPropertyAttr) { 12344 IdentifierInfo *II = D.getIdentifier(); 12345 if (!II) { 12346 Diag(DeclStart, diag::err_anonymous_property); 12347 return NULL; 12348 } 12349 SourceLocation Loc = D.getIdentifierLoc(); 12350 12351 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12352 QualType T = TInfo->getType(); 12353 if (getLangOpts().CPlusPlus) { 12354 CheckExtraCXXDefaultArguments(D); 12355 12356 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12357 UPPC_DataMemberType)) { 12358 D.setInvalidType(); 12359 T = Context.IntTy; 12360 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12361 } 12362 } 12363 12364 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12365 12366 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12367 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12368 diag::err_invalid_thread) 12369 << DeclSpec::getSpecifierName(TSCS); 12370 12371 // Check to see if this name was declared as a member previously 12372 NamedDecl *PrevDecl = 0; 12373 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12374 LookupName(Previous, S); 12375 switch (Previous.getResultKind()) { 12376 case LookupResult::Found: 12377 case LookupResult::FoundUnresolvedValue: 12378 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12379 break; 12380 12381 case LookupResult::FoundOverloaded: 12382 PrevDecl = Previous.getRepresentativeDecl(); 12383 break; 12384 12385 case LookupResult::NotFound: 12386 case LookupResult::NotFoundInCurrentInstantiation: 12387 case LookupResult::Ambiguous: 12388 break; 12389 } 12390 12391 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12392 // Maybe we will complain about the shadowed template parameter. 12393 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12394 // Just pretend that we didn't see the previous declaration. 12395 PrevDecl = 0; 12396 } 12397 12398 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12399 PrevDecl = 0; 12400 12401 SourceLocation TSSL = D.getLocStart(); 12402 MSPropertyDecl *NewPD; 12403 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12404 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12405 II, T, TInfo, TSSL, 12406 Data.GetterId, Data.SetterId); 12407 ProcessDeclAttributes(TUScope, NewPD, D); 12408 NewPD->setAccess(AS); 12409 12410 if (NewPD->isInvalidDecl()) 12411 Record->setInvalidDecl(); 12412 12413 if (D.getDeclSpec().isModulePrivateSpecified()) 12414 NewPD->setModulePrivate(); 12415 12416 if (NewPD->isInvalidDecl() && PrevDecl) { 12417 // Don't introduce NewFD into scope; there's already something 12418 // with the same name in the same scope. 12419 } else if (II) { 12420 PushOnScopeChains(NewPD, S); 12421 } else 12422 Record->addDecl(NewPD); 12423 12424 return NewPD; 12425} 12426