SemaDeclCXX.cpp revision 987c03085558277a5fe8cef8e1b628cabcc626dc
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, 1); 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++0x [dcl.constexpr]p3,p4. 779/// 780/// \return true if the body is OK, false if we have diagnosed a problem. 781static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 782 DeclStmt *DS) { 783 // C++0x [dcl.constexpr]p3 and p4: 784 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 785 // contain only 786 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 787 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 788 switch ((*DclIt)->getKind()) { 789 case Decl::StaticAssert: 790 case Decl::Using: 791 case Decl::UsingShadow: 792 case Decl::UsingDirective: 793 case Decl::UnresolvedUsingTypename: 794 // - static_assert-declarations 795 // - using-declarations, 796 // - using-directives, 797 continue; 798 799 case Decl::Typedef: 800 case Decl::TypeAlias: { 801 // - typedef declarations and alias-declarations that do not define 802 // classes or enumerations, 803 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 804 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 805 // Don't allow variably-modified types in constexpr functions. 806 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 807 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 808 << TL.getSourceRange() << TL.getType() 809 << isa<CXXConstructorDecl>(Dcl); 810 return false; 811 } 812 continue; 813 } 814 815 case Decl::Enum: 816 case Decl::CXXRecord: 817 // As an extension, we allow the declaration (but not the definition) of 818 // classes and enumerations in all declarations, not just in typedef and 819 // alias declarations. 820 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 821 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 822 << isa<CXXConstructorDecl>(Dcl); 823 return false; 824 } 825 continue; 826 827 case Decl::Var: 828 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 829 << isa<CXXConstructorDecl>(Dcl); 830 return false; 831 832 default: 833 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 834 << isa<CXXConstructorDecl>(Dcl); 835 return false; 836 } 837 } 838 839 return true; 840} 841 842/// Check that the given field is initialized within a constexpr constructor. 843/// 844/// \param Dcl The constexpr constructor being checked. 845/// \param Field The field being checked. This may be a member of an anonymous 846/// struct or union nested within the class being checked. 847/// \param Inits All declarations, including anonymous struct/union members and 848/// indirect members, for which any initialization was provided. 849/// \param Diagnosed Set to true if an error is produced. 850static void CheckConstexprCtorInitializer(Sema &SemaRef, 851 const FunctionDecl *Dcl, 852 FieldDecl *Field, 853 llvm::SmallSet<Decl*, 16> &Inits, 854 bool &Diagnosed) { 855 if (Field->isUnnamedBitfield()) 856 return; 857 858 if (Field->isAnonymousStructOrUnion() && 859 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 860 return; 861 862 if (!Inits.count(Field)) { 863 if (!Diagnosed) { 864 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 865 Diagnosed = true; 866 } 867 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 868 } else if (Field->isAnonymousStructOrUnion()) { 869 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 870 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 871 I != E; ++I) 872 // If an anonymous union contains an anonymous struct of which any member 873 // is initialized, all members must be initialized. 874 if (!RD->isUnion() || Inits.count(*I)) 875 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 876 } 877} 878 879/// Check the body for the given constexpr function declaration only contains 880/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 881/// 882/// \return true if the body is OK, false if we have diagnosed a problem. 883bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 884 if (isa<CXXTryStmt>(Body)) { 885 // C++11 [dcl.constexpr]p3: 886 // The definition of a constexpr function shall satisfy the following 887 // constraints: [...] 888 // - its function-body shall be = delete, = default, or a 889 // compound-statement 890 // 891 // C++11 [dcl.constexpr]p4: 892 // In the definition of a constexpr constructor, [...] 893 // - its function-body shall not be a function-try-block; 894 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 895 << isa<CXXConstructorDecl>(Dcl); 896 return false; 897 } 898 899 // - its function-body shall be [...] a compound-statement that contains only 900 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 901 902 SmallVector<SourceLocation, 4> ReturnStmts; 903 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 904 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 905 switch ((*BodyIt)->getStmtClass()) { 906 case Stmt::NullStmtClass: 907 // - null statements, 908 continue; 909 910 case Stmt::DeclStmtClass: 911 // - static_assert-declarations 912 // - using-declarations, 913 // - using-directives, 914 // - typedef declarations and alias-declarations that do not define 915 // classes or enumerations, 916 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 917 return false; 918 continue; 919 920 case Stmt::ReturnStmtClass: 921 // - and exactly one return statement; 922 if (isa<CXXConstructorDecl>(Dcl)) 923 break; 924 925 ReturnStmts.push_back((*BodyIt)->getLocStart()); 926 continue; 927 928 default: 929 break; 930 } 931 932 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 933 << isa<CXXConstructorDecl>(Dcl); 934 return false; 935 } 936 937 if (const CXXConstructorDecl *Constructor 938 = dyn_cast<CXXConstructorDecl>(Dcl)) { 939 const CXXRecordDecl *RD = Constructor->getParent(); 940 // DR1359: 941 // - every non-variant non-static data member and base class sub-object 942 // shall be initialized; 943 // - if the class is a non-empty union, or for each non-empty anonymous 944 // union member of a non-union class, exactly one non-static data member 945 // shall be initialized; 946 if (RD->isUnion()) { 947 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 948 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 949 return false; 950 } 951 } else if (!Constructor->isDependentContext() && 952 !Constructor->isDelegatingConstructor()) { 953 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 954 955 // Skip detailed checking if we have enough initializers, and we would 956 // allow at most one initializer per member. 957 bool AnyAnonStructUnionMembers = false; 958 unsigned Fields = 0; 959 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 960 E = RD->field_end(); I != E; ++I, ++Fields) { 961 if (I->isAnonymousStructOrUnion()) { 962 AnyAnonStructUnionMembers = true; 963 break; 964 } 965 } 966 if (AnyAnonStructUnionMembers || 967 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 968 // Check initialization of non-static data members. Base classes are 969 // always initialized so do not need to be checked. Dependent bases 970 // might not have initializers in the member initializer list. 971 llvm::SmallSet<Decl*, 16> Inits; 972 for (CXXConstructorDecl::init_const_iterator 973 I = Constructor->init_begin(), E = Constructor->init_end(); 974 I != E; ++I) { 975 if (FieldDecl *FD = (*I)->getMember()) 976 Inits.insert(FD); 977 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 978 Inits.insert(ID->chain_begin(), ID->chain_end()); 979 } 980 981 bool Diagnosed = false; 982 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 983 E = RD->field_end(); I != E; ++I) 984 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 985 if (Diagnosed) 986 return false; 987 } 988 } 989 } else { 990 if (ReturnStmts.empty()) { 991 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 992 return false; 993 } 994 if (ReturnStmts.size() > 1) { 995 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 996 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 997 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 998 return false; 999 } 1000 } 1001 1002 // C++11 [dcl.constexpr]p5: 1003 // if no function argument values exist such that the function invocation 1004 // substitution would produce a constant expression, the program is 1005 // ill-formed; no diagnostic required. 1006 // C++11 [dcl.constexpr]p3: 1007 // - every constructor call and implicit conversion used in initializing the 1008 // return value shall be one of those allowed in a constant expression. 1009 // C++11 [dcl.constexpr]p4: 1010 // - every constructor involved in initializing non-static data members and 1011 // base class sub-objects shall be a constexpr constructor. 1012 SmallVector<PartialDiagnosticAt, 8> Diags; 1013 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1014 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1015 << isa<CXXConstructorDecl>(Dcl); 1016 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1017 Diag(Diags[I].first, Diags[I].second); 1018 // Don't return false here: we allow this for compatibility in 1019 // system headers. 1020 } 1021 1022 return true; 1023} 1024 1025/// isCurrentClassName - Determine whether the identifier II is the 1026/// name of the class type currently being defined. In the case of 1027/// nested classes, this will only return true if II is the name of 1028/// the innermost class. 1029bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1030 const CXXScopeSpec *SS) { 1031 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1032 1033 CXXRecordDecl *CurDecl; 1034 if (SS && SS->isSet() && !SS->isInvalid()) { 1035 DeclContext *DC = computeDeclContext(*SS, true); 1036 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1037 } else 1038 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1039 1040 if (CurDecl && CurDecl->getIdentifier()) 1041 return &II == CurDecl->getIdentifier(); 1042 else 1043 return false; 1044} 1045 1046/// \brief Determine whether the given class is a base class of the given 1047/// class, including looking at dependent bases. 1048static bool findCircularInheritance(const CXXRecordDecl *Class, 1049 const CXXRecordDecl *Current) { 1050 SmallVector<const CXXRecordDecl*, 8> Queue; 1051 1052 Class = Class->getCanonicalDecl(); 1053 while (true) { 1054 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1055 E = Current->bases_end(); 1056 I != E; ++I) { 1057 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1058 if (!Base) 1059 continue; 1060 1061 Base = Base->getDefinition(); 1062 if (!Base) 1063 continue; 1064 1065 if (Base->getCanonicalDecl() == Class) 1066 return true; 1067 1068 Queue.push_back(Base); 1069 } 1070 1071 if (Queue.empty()) 1072 return false; 1073 1074 Current = Queue.back(); 1075 Queue.pop_back(); 1076 } 1077 1078 return false; 1079} 1080 1081/// \brief Check the validity of a C++ base class specifier. 1082/// 1083/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1084/// and returns NULL otherwise. 1085CXXBaseSpecifier * 1086Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1087 SourceRange SpecifierRange, 1088 bool Virtual, AccessSpecifier Access, 1089 TypeSourceInfo *TInfo, 1090 SourceLocation EllipsisLoc) { 1091 QualType BaseType = TInfo->getType(); 1092 1093 // C++ [class.union]p1: 1094 // A union shall not have base classes. 1095 if (Class->isUnion()) { 1096 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1097 << SpecifierRange; 1098 return 0; 1099 } 1100 1101 if (EllipsisLoc.isValid() && 1102 !TInfo->getType()->containsUnexpandedParameterPack()) { 1103 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1104 << TInfo->getTypeLoc().getSourceRange(); 1105 EllipsisLoc = SourceLocation(); 1106 } 1107 1108 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1109 1110 if (BaseType->isDependentType()) { 1111 // Make sure that we don't have circular inheritance among our dependent 1112 // bases. For non-dependent bases, the check for completeness below handles 1113 // this. 1114 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1115 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1116 ((BaseDecl = BaseDecl->getDefinition()) && 1117 findCircularInheritance(Class, BaseDecl))) { 1118 Diag(BaseLoc, diag::err_circular_inheritance) 1119 << BaseType << Context.getTypeDeclType(Class); 1120 1121 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1122 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1123 << BaseType; 1124 1125 return 0; 1126 } 1127 } 1128 1129 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1130 Class->getTagKind() == TTK_Class, 1131 Access, TInfo, EllipsisLoc); 1132 } 1133 1134 // Base specifiers must be record types. 1135 if (!BaseType->isRecordType()) { 1136 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1137 return 0; 1138 } 1139 1140 // C++ [class.union]p1: 1141 // A union shall not be used as a base class. 1142 if (BaseType->isUnionType()) { 1143 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1144 return 0; 1145 } 1146 1147 // C++ [class.derived]p2: 1148 // The class-name in a base-specifier shall not be an incompletely 1149 // defined class. 1150 if (RequireCompleteType(BaseLoc, BaseType, 1151 diag::err_incomplete_base_class, SpecifierRange)) { 1152 Class->setInvalidDecl(); 1153 return 0; 1154 } 1155 1156 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1157 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1158 assert(BaseDecl && "Record type has no declaration"); 1159 BaseDecl = BaseDecl->getDefinition(); 1160 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1161 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1162 assert(CXXBaseDecl && "Base type is not a C++ type"); 1163 1164 // C++ [class]p3: 1165 // If a class is marked final and it appears as a base-type-specifier in 1166 // base-clause, the program is ill-formed. 1167 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1168 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1169 << CXXBaseDecl->getDeclName(); 1170 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1171 << CXXBaseDecl->getDeclName(); 1172 return 0; 1173 } 1174 1175 if (BaseDecl->isInvalidDecl()) 1176 Class->setInvalidDecl(); 1177 1178 // Create the base specifier. 1179 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1180 Class->getTagKind() == TTK_Class, 1181 Access, TInfo, EllipsisLoc); 1182} 1183 1184/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1185/// one entry in the base class list of a class specifier, for 1186/// example: 1187/// class foo : public bar, virtual private baz { 1188/// 'public bar' and 'virtual private baz' are each base-specifiers. 1189BaseResult 1190Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1191 ParsedAttributes &Attributes, 1192 bool Virtual, AccessSpecifier Access, 1193 ParsedType basetype, SourceLocation BaseLoc, 1194 SourceLocation EllipsisLoc) { 1195 if (!classdecl) 1196 return true; 1197 1198 AdjustDeclIfTemplate(classdecl); 1199 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1200 if (!Class) 1201 return true; 1202 1203 // We do not support any C++11 attributes on base-specifiers yet. 1204 // Diagnose any attributes we see. 1205 if (!Attributes.empty()) { 1206 for (AttributeList *Attr = Attributes.getList(); Attr; 1207 Attr = Attr->getNext()) { 1208 if (Attr->isInvalid() || 1209 Attr->getKind() == AttributeList::IgnoredAttribute) 1210 continue; 1211 Diag(Attr->getLoc(), 1212 Attr->getKind() == AttributeList::UnknownAttribute 1213 ? diag::warn_unknown_attribute_ignored 1214 : diag::err_base_specifier_attribute) 1215 << Attr->getName(); 1216 } 1217 } 1218 1219 TypeSourceInfo *TInfo = 0; 1220 GetTypeFromParser(basetype, &TInfo); 1221 1222 if (EllipsisLoc.isInvalid() && 1223 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1224 UPPC_BaseType)) 1225 return true; 1226 1227 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1228 Virtual, Access, TInfo, 1229 EllipsisLoc)) 1230 return BaseSpec; 1231 else 1232 Class->setInvalidDecl(); 1233 1234 return true; 1235} 1236 1237/// \brief Performs the actual work of attaching the given base class 1238/// specifiers to a C++ class. 1239bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1240 unsigned NumBases) { 1241 if (NumBases == 0) 1242 return false; 1243 1244 // Used to keep track of which base types we have already seen, so 1245 // that we can properly diagnose redundant direct base types. Note 1246 // that the key is always the unqualified canonical type of the base 1247 // class. 1248 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1249 1250 // Copy non-redundant base specifiers into permanent storage. 1251 unsigned NumGoodBases = 0; 1252 bool Invalid = false; 1253 for (unsigned idx = 0; idx < NumBases; ++idx) { 1254 QualType NewBaseType 1255 = Context.getCanonicalType(Bases[idx]->getType()); 1256 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1257 1258 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1259 if (KnownBase) { 1260 // C++ [class.mi]p3: 1261 // A class shall not be specified as a direct base class of a 1262 // derived class more than once. 1263 Diag(Bases[idx]->getLocStart(), 1264 diag::err_duplicate_base_class) 1265 << KnownBase->getType() 1266 << Bases[idx]->getSourceRange(); 1267 1268 // Delete the duplicate base class specifier; we're going to 1269 // overwrite its pointer later. 1270 Context.Deallocate(Bases[idx]); 1271 1272 Invalid = true; 1273 } else { 1274 // Okay, add this new base class. 1275 KnownBase = Bases[idx]; 1276 Bases[NumGoodBases++] = Bases[idx]; 1277 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1278 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1279 if (Class->isInterface() && 1280 (!RD->isInterface() || 1281 KnownBase->getAccessSpecifier() != AS_public)) { 1282 // The Microsoft extension __interface does not permit bases that 1283 // are not themselves public interfaces. 1284 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1285 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1286 << RD->getSourceRange(); 1287 Invalid = true; 1288 } 1289 if (RD->hasAttr<WeakAttr>()) 1290 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1291 } 1292 } 1293 } 1294 1295 // Attach the remaining base class specifiers to the derived class. 1296 Class->setBases(Bases, NumGoodBases); 1297 1298 // Delete the remaining (good) base class specifiers, since their 1299 // data has been copied into the CXXRecordDecl. 1300 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1301 Context.Deallocate(Bases[idx]); 1302 1303 return Invalid; 1304} 1305 1306/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1307/// class, after checking whether there are any duplicate base 1308/// classes. 1309void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1310 unsigned NumBases) { 1311 if (!ClassDecl || !Bases || !NumBases) 1312 return; 1313 1314 AdjustDeclIfTemplate(ClassDecl); 1315 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1316 (CXXBaseSpecifier**)(Bases), NumBases); 1317} 1318 1319/// \brief Determine whether the type \p Derived is a C++ class that is 1320/// derived from the type \p Base. 1321bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1322 if (!getLangOpts().CPlusPlus) 1323 return false; 1324 1325 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1326 if (!DerivedRD) 1327 return false; 1328 1329 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1330 if (!BaseRD) 1331 return false; 1332 1333 // If either the base or the derived type is invalid, don't try to 1334 // check whether one is derived from the other. 1335 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1336 return false; 1337 1338 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1339 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1340} 1341 1342/// \brief Determine whether the type \p Derived is a C++ class that is 1343/// derived from the type \p Base. 1344bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1345 if (!getLangOpts().CPlusPlus) 1346 return false; 1347 1348 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1349 if (!DerivedRD) 1350 return false; 1351 1352 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1353 if (!BaseRD) 1354 return false; 1355 1356 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1357} 1358 1359void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1360 CXXCastPath &BasePathArray) { 1361 assert(BasePathArray.empty() && "Base path array must be empty!"); 1362 assert(Paths.isRecordingPaths() && "Must record paths!"); 1363 1364 const CXXBasePath &Path = Paths.front(); 1365 1366 // We first go backward and check if we have a virtual base. 1367 // FIXME: It would be better if CXXBasePath had the base specifier for 1368 // the nearest virtual base. 1369 unsigned Start = 0; 1370 for (unsigned I = Path.size(); I != 0; --I) { 1371 if (Path[I - 1].Base->isVirtual()) { 1372 Start = I - 1; 1373 break; 1374 } 1375 } 1376 1377 // Now add all bases. 1378 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1379 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1380} 1381 1382/// \brief Determine whether the given base path includes a virtual 1383/// base class. 1384bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1385 for (CXXCastPath::const_iterator B = BasePath.begin(), 1386 BEnd = BasePath.end(); 1387 B != BEnd; ++B) 1388 if ((*B)->isVirtual()) 1389 return true; 1390 1391 return false; 1392} 1393 1394/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1395/// conversion (where Derived and Base are class types) is 1396/// well-formed, meaning that the conversion is unambiguous (and 1397/// that all of the base classes are accessible). Returns true 1398/// and emits a diagnostic if the code is ill-formed, returns false 1399/// otherwise. Loc is the location where this routine should point to 1400/// if there is an error, and Range is the source range to highlight 1401/// if there is an error. 1402bool 1403Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1404 unsigned InaccessibleBaseID, 1405 unsigned AmbigiousBaseConvID, 1406 SourceLocation Loc, SourceRange Range, 1407 DeclarationName Name, 1408 CXXCastPath *BasePath) { 1409 // First, determine whether the path from Derived to Base is 1410 // ambiguous. This is slightly more expensive than checking whether 1411 // the Derived to Base conversion exists, because here we need to 1412 // explore multiple paths to determine if there is an ambiguity. 1413 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1414 /*DetectVirtual=*/false); 1415 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1416 assert(DerivationOkay && 1417 "Can only be used with a derived-to-base conversion"); 1418 (void)DerivationOkay; 1419 1420 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1421 if (InaccessibleBaseID) { 1422 // Check that the base class can be accessed. 1423 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1424 InaccessibleBaseID)) { 1425 case AR_inaccessible: 1426 return true; 1427 case AR_accessible: 1428 case AR_dependent: 1429 case AR_delayed: 1430 break; 1431 } 1432 } 1433 1434 // Build a base path if necessary. 1435 if (BasePath) 1436 BuildBasePathArray(Paths, *BasePath); 1437 return false; 1438 } 1439 1440 // We know that the derived-to-base conversion is ambiguous, and 1441 // we're going to produce a diagnostic. Perform the derived-to-base 1442 // search just one more time to compute all of the possible paths so 1443 // that we can print them out. This is more expensive than any of 1444 // the previous derived-to-base checks we've done, but at this point 1445 // performance isn't as much of an issue. 1446 Paths.clear(); 1447 Paths.setRecordingPaths(true); 1448 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1449 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1450 (void)StillOkay; 1451 1452 // Build up a textual representation of the ambiguous paths, e.g., 1453 // D -> B -> A, that will be used to illustrate the ambiguous 1454 // conversions in the diagnostic. We only print one of the paths 1455 // to each base class subobject. 1456 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1457 1458 Diag(Loc, AmbigiousBaseConvID) 1459 << Derived << Base << PathDisplayStr << Range << Name; 1460 return true; 1461} 1462 1463bool 1464Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1465 SourceLocation Loc, SourceRange Range, 1466 CXXCastPath *BasePath, 1467 bool IgnoreAccess) { 1468 return CheckDerivedToBaseConversion(Derived, Base, 1469 IgnoreAccess ? 0 1470 : diag::err_upcast_to_inaccessible_base, 1471 diag::err_ambiguous_derived_to_base_conv, 1472 Loc, Range, DeclarationName(), 1473 BasePath); 1474} 1475 1476 1477/// @brief Builds a string representing ambiguous paths from a 1478/// specific derived class to different subobjects of the same base 1479/// class. 1480/// 1481/// This function builds a string that can be used in error messages 1482/// to show the different paths that one can take through the 1483/// inheritance hierarchy to go from the derived class to different 1484/// subobjects of a base class. The result looks something like this: 1485/// @code 1486/// struct D -> struct B -> struct A 1487/// struct D -> struct C -> struct A 1488/// @endcode 1489std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1490 std::string PathDisplayStr; 1491 std::set<unsigned> DisplayedPaths; 1492 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1493 Path != Paths.end(); ++Path) { 1494 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1495 // We haven't displayed a path to this particular base 1496 // class subobject yet. 1497 PathDisplayStr += "\n "; 1498 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1499 for (CXXBasePath::const_iterator Element = Path->begin(); 1500 Element != Path->end(); ++Element) 1501 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1502 } 1503 } 1504 1505 return PathDisplayStr; 1506} 1507 1508//===----------------------------------------------------------------------===// 1509// C++ class member Handling 1510//===----------------------------------------------------------------------===// 1511 1512/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1513bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1514 SourceLocation ASLoc, 1515 SourceLocation ColonLoc, 1516 AttributeList *Attrs) { 1517 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1518 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1519 ASLoc, ColonLoc); 1520 CurContext->addHiddenDecl(ASDecl); 1521 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1522} 1523 1524/// CheckOverrideControl - Check C++11 override control semantics. 1525void Sema::CheckOverrideControl(Decl *D) { 1526 if (D->isInvalidDecl()) 1527 return; 1528 1529 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1530 1531 // Do we know which functions this declaration might be overriding? 1532 bool OverridesAreKnown = !MD || 1533 (!MD->getParent()->hasAnyDependentBases() && 1534 !MD->getType()->isDependentType()); 1535 1536 if (!MD || !MD->isVirtual()) { 1537 if (OverridesAreKnown) { 1538 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1539 Diag(OA->getLocation(), 1540 diag::override_keyword_only_allowed_on_virtual_member_functions) 1541 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1542 D->dropAttr<OverrideAttr>(); 1543 } 1544 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1545 Diag(FA->getLocation(), 1546 diag::override_keyword_only_allowed_on_virtual_member_functions) 1547 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1548 D->dropAttr<FinalAttr>(); 1549 } 1550 } 1551 return; 1552 } 1553 1554 if (!OverridesAreKnown) 1555 return; 1556 1557 // C++11 [class.virtual]p5: 1558 // If a virtual function is marked with the virt-specifier override and 1559 // does not override a member function of a base class, the program is 1560 // ill-formed. 1561 bool HasOverriddenMethods = 1562 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1563 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1564 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1565 << MD->getDeclName(); 1566} 1567 1568/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1569/// function overrides a virtual member function marked 'final', according to 1570/// C++11 [class.virtual]p4. 1571bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1572 const CXXMethodDecl *Old) { 1573 if (!Old->hasAttr<FinalAttr>()) 1574 return false; 1575 1576 Diag(New->getLocation(), diag::err_final_function_overridden) 1577 << New->getDeclName(); 1578 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1579 return true; 1580} 1581 1582static bool InitializationHasSideEffects(const FieldDecl &FD) { 1583 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1584 // FIXME: Destruction of ObjC lifetime types has side-effects. 1585 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1586 return !RD->isCompleteDefinition() || 1587 !RD->hasTrivialDefaultConstructor() || 1588 !RD->hasTrivialDestructor(); 1589 return false; 1590} 1591 1592static AttributeList *getMSPropertyAttr(AttributeList *list) { 1593 for (AttributeList* it = list; it != 0; it = it->getNext()) 1594 if (it->isDeclspecPropertyAttribute()) 1595 return it; 1596 return 0; 1597} 1598 1599/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1600/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1601/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1602/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1603/// present (but parsing it has been deferred). 1604NamedDecl * 1605Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1606 MultiTemplateParamsArg TemplateParameterLists, 1607 Expr *BW, const VirtSpecifiers &VS, 1608 InClassInitStyle InitStyle) { 1609 const DeclSpec &DS = D.getDeclSpec(); 1610 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1611 DeclarationName Name = NameInfo.getName(); 1612 SourceLocation Loc = NameInfo.getLoc(); 1613 1614 // For anonymous bitfields, the location should point to the type. 1615 if (Loc.isInvalid()) 1616 Loc = D.getLocStart(); 1617 1618 Expr *BitWidth = static_cast<Expr*>(BW); 1619 1620 assert(isa<CXXRecordDecl>(CurContext)); 1621 assert(!DS.isFriendSpecified()); 1622 1623 bool isFunc = D.isDeclarationOfFunction(); 1624 1625 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1626 // The Microsoft extension __interface only permits public member functions 1627 // and prohibits constructors, destructors, operators, non-public member 1628 // functions, static methods and data members. 1629 unsigned InvalidDecl; 1630 bool ShowDeclName = true; 1631 if (!isFunc) 1632 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1633 else if (AS != AS_public) 1634 InvalidDecl = 2; 1635 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1636 InvalidDecl = 3; 1637 else switch (Name.getNameKind()) { 1638 case DeclarationName::CXXConstructorName: 1639 InvalidDecl = 4; 1640 ShowDeclName = false; 1641 break; 1642 1643 case DeclarationName::CXXDestructorName: 1644 InvalidDecl = 5; 1645 ShowDeclName = false; 1646 break; 1647 1648 case DeclarationName::CXXOperatorName: 1649 case DeclarationName::CXXConversionFunctionName: 1650 InvalidDecl = 6; 1651 break; 1652 1653 default: 1654 InvalidDecl = 0; 1655 break; 1656 } 1657 1658 if (InvalidDecl) { 1659 if (ShowDeclName) 1660 Diag(Loc, diag::err_invalid_member_in_interface) 1661 << (InvalidDecl-1) << Name; 1662 else 1663 Diag(Loc, diag::err_invalid_member_in_interface) 1664 << (InvalidDecl-1) << ""; 1665 return 0; 1666 } 1667 } 1668 1669 // C++ 9.2p6: A member shall not be declared to have automatic storage 1670 // duration (auto, register) or with the extern storage-class-specifier. 1671 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1672 // data members and cannot be applied to names declared const or static, 1673 // and cannot be applied to reference members. 1674 switch (DS.getStorageClassSpec()) { 1675 case DeclSpec::SCS_unspecified: 1676 case DeclSpec::SCS_typedef: 1677 case DeclSpec::SCS_static: 1678 break; 1679 case DeclSpec::SCS_mutable: 1680 if (isFunc) { 1681 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1682 1683 // FIXME: It would be nicer if the keyword was ignored only for this 1684 // declarator. Otherwise we could get follow-up errors. 1685 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1686 } 1687 break; 1688 default: 1689 Diag(DS.getStorageClassSpecLoc(), 1690 diag::err_storageclass_invalid_for_member); 1691 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1692 break; 1693 } 1694 1695 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1696 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1697 !isFunc); 1698 1699 if (DS.isConstexprSpecified() && isInstField) { 1700 SemaDiagnosticBuilder B = 1701 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1702 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1703 if (InitStyle == ICIS_NoInit) { 1704 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1705 D.getMutableDeclSpec().ClearConstexprSpec(); 1706 const char *PrevSpec; 1707 unsigned DiagID; 1708 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1709 PrevSpec, DiagID, getLangOpts()); 1710 (void)Failed; 1711 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1712 } else { 1713 B << 1; 1714 const char *PrevSpec; 1715 unsigned DiagID; 1716 if (D.getMutableDeclSpec().SetStorageClassSpec( 1717 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1718 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1719 "This is the only DeclSpec that should fail to be applied"); 1720 B << 1; 1721 } else { 1722 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1723 isInstField = false; 1724 } 1725 } 1726 } 1727 1728 NamedDecl *Member; 1729 if (isInstField) { 1730 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1731 1732 // Data members must have identifiers for names. 1733 if (!Name.isIdentifier()) { 1734 Diag(Loc, diag::err_bad_variable_name) 1735 << Name; 1736 return 0; 1737 } 1738 1739 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1740 1741 // Member field could not be with "template" keyword. 1742 // So TemplateParameterLists should be empty in this case. 1743 if (TemplateParameterLists.size()) { 1744 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1745 if (TemplateParams->size()) { 1746 // There is no such thing as a member field template. 1747 Diag(D.getIdentifierLoc(), diag::err_template_member) 1748 << II 1749 << SourceRange(TemplateParams->getTemplateLoc(), 1750 TemplateParams->getRAngleLoc()); 1751 } else { 1752 // There is an extraneous 'template<>' for this member. 1753 Diag(TemplateParams->getTemplateLoc(), 1754 diag::err_template_member_noparams) 1755 << II 1756 << SourceRange(TemplateParams->getTemplateLoc(), 1757 TemplateParams->getRAngleLoc()); 1758 } 1759 return 0; 1760 } 1761 1762 if (SS.isSet() && !SS.isInvalid()) { 1763 // The user provided a superfluous scope specifier inside a class 1764 // definition: 1765 // 1766 // class X { 1767 // int X::member; 1768 // }; 1769 if (DeclContext *DC = computeDeclContext(SS, false)) 1770 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1771 else 1772 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1773 << Name << SS.getRange(); 1774 1775 SS.clear(); 1776 } 1777 1778 AttributeList *MSPropertyAttr = 1779 getMSPropertyAttr(D.getDeclSpec().getAttributes().getList()); 1780 if (MSPropertyAttr) { 1781 Member = HandleMSProperty(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1782 BitWidth, InitStyle, AS, MSPropertyAttr); 1783 isInstField = false; 1784 } else { 1785 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, 1786 BitWidth, InitStyle, AS); 1787 } 1788 assert(Member && "HandleField never returns null"); 1789 } else { 1790 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1791 1792 Member = HandleDeclarator(S, D, TemplateParameterLists); 1793 if (!Member) { 1794 return 0; 1795 } 1796 1797 // Non-instance-fields can't have a bitfield. 1798 if (BitWidth) { 1799 if (Member->isInvalidDecl()) { 1800 // don't emit another diagnostic. 1801 } else if (isa<VarDecl>(Member)) { 1802 // C++ 9.6p3: A bit-field shall not be a static member. 1803 // "static member 'A' cannot be a bit-field" 1804 Diag(Loc, diag::err_static_not_bitfield) 1805 << Name << BitWidth->getSourceRange(); 1806 } else if (isa<TypedefDecl>(Member)) { 1807 // "typedef member 'x' cannot be a bit-field" 1808 Diag(Loc, diag::err_typedef_not_bitfield) 1809 << Name << BitWidth->getSourceRange(); 1810 } else { 1811 // A function typedef ("typedef int f(); f a;"). 1812 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1813 Diag(Loc, diag::err_not_integral_type_bitfield) 1814 << Name << cast<ValueDecl>(Member)->getType() 1815 << BitWidth->getSourceRange(); 1816 } 1817 1818 BitWidth = 0; 1819 Member->setInvalidDecl(); 1820 } 1821 1822 Member->setAccess(AS); 1823 1824 // If we have declared a member function template, set the access of the 1825 // templated declaration as well. 1826 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1827 FunTmpl->getTemplatedDecl()->setAccess(AS); 1828 } 1829 1830 if (VS.isOverrideSpecified()) 1831 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1832 if (VS.isFinalSpecified()) 1833 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1834 1835 if (VS.getLastLocation().isValid()) { 1836 // Update the end location of a method that has a virt-specifiers. 1837 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1838 MD->setRangeEnd(VS.getLastLocation()); 1839 } 1840 1841 CheckOverrideControl(Member); 1842 1843 assert((Name || isInstField) && "No identifier for non-field ?"); 1844 1845 if (isInstField) { 1846 FieldDecl *FD = cast<FieldDecl>(Member); 1847 FieldCollector->Add(FD); 1848 1849 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1850 FD->getLocation()) 1851 != DiagnosticsEngine::Ignored) { 1852 // Remember all explicit private FieldDecls that have a name, no side 1853 // effects and are not part of a dependent type declaration. 1854 if (!FD->isImplicit() && FD->getDeclName() && 1855 FD->getAccess() == AS_private && 1856 !FD->hasAttr<UnusedAttr>() && 1857 !FD->getParent()->isDependentContext() && 1858 !InitializationHasSideEffects(*FD)) 1859 UnusedPrivateFields.insert(FD); 1860 } 1861 } 1862 1863 return Member; 1864} 1865 1866namespace { 1867 class UninitializedFieldVisitor 1868 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1869 Sema &S; 1870 ValueDecl *VD; 1871 public: 1872 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1873 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1874 S(S) { 1875 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1876 this->VD = IFD->getAnonField(); 1877 else 1878 this->VD = VD; 1879 } 1880 1881 void HandleExpr(Expr *E) { 1882 if (!E) return; 1883 1884 // Expressions like x(x) sometimes lack the surrounding expressions 1885 // but need to be checked anyways. 1886 HandleValue(E); 1887 Visit(E); 1888 } 1889 1890 void HandleValue(Expr *E) { 1891 E = E->IgnoreParens(); 1892 1893 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1894 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1895 return; 1896 1897 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1898 // or union. 1899 MemberExpr *FieldME = ME; 1900 1901 Expr *Base = E; 1902 while (isa<MemberExpr>(Base)) { 1903 ME = cast<MemberExpr>(Base); 1904 1905 if (isa<VarDecl>(ME->getMemberDecl())) 1906 return; 1907 1908 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1909 if (!FD->isAnonymousStructOrUnion()) 1910 FieldME = ME; 1911 1912 Base = ME->getBase(); 1913 } 1914 1915 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1916 unsigned diag = VD->getType()->isReferenceType() 1917 ? diag::warn_reference_field_is_uninit 1918 : diag::warn_field_is_uninit; 1919 S.Diag(FieldME->getExprLoc(), diag) << VD; 1920 } 1921 return; 1922 } 1923 1924 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1925 HandleValue(CO->getTrueExpr()); 1926 HandleValue(CO->getFalseExpr()); 1927 return; 1928 } 1929 1930 if (BinaryConditionalOperator *BCO = 1931 dyn_cast<BinaryConditionalOperator>(E)) { 1932 HandleValue(BCO->getCommon()); 1933 HandleValue(BCO->getFalseExpr()); 1934 return; 1935 } 1936 1937 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1938 switch (BO->getOpcode()) { 1939 default: 1940 return; 1941 case(BO_PtrMemD): 1942 case(BO_PtrMemI): 1943 HandleValue(BO->getLHS()); 1944 return; 1945 case(BO_Comma): 1946 HandleValue(BO->getRHS()); 1947 return; 1948 } 1949 } 1950 } 1951 1952 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1953 if (E->getCastKind() == CK_LValueToRValue) 1954 HandleValue(E->getSubExpr()); 1955 1956 Inherited::VisitImplicitCastExpr(E); 1957 } 1958 1959 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1960 Expr *Callee = E->getCallee(); 1961 if (isa<MemberExpr>(Callee)) 1962 HandleValue(Callee); 1963 1964 Inherited::VisitCXXMemberCallExpr(E); 1965 } 1966 }; 1967 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1968 ValueDecl *VD) { 1969 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1970 } 1971} // namespace 1972 1973/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1974/// in-class initializer for a non-static C++ class member, and after 1975/// instantiating an in-class initializer in a class template. Such actions 1976/// are deferred until the class is complete. 1977void 1978Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1979 Expr *InitExpr) { 1980 FieldDecl *FD = cast<FieldDecl>(D); 1981 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1982 "must set init style when field is created"); 1983 1984 if (!InitExpr) { 1985 FD->setInvalidDecl(); 1986 FD->removeInClassInitializer(); 1987 return; 1988 } 1989 1990 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1991 FD->setInvalidDecl(); 1992 FD->removeInClassInitializer(); 1993 return; 1994 } 1995 1996 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1997 != DiagnosticsEngine::Ignored) { 1998 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1999 } 2000 2001 ExprResult Init = InitExpr; 2002 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 2003 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 2004 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 2005 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 2006 } 2007 Expr **Inits = &InitExpr; 2008 unsigned NumInits = 1; 2009 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 2010 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 2011 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 2012 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 2013 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 2014 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 2015 if (Init.isInvalid()) { 2016 FD->setInvalidDecl(); 2017 return; 2018 } 2019 } 2020 2021 // C++11 [class.base.init]p7: 2022 // The initialization of each base and member constitutes a 2023 // full-expression. 2024 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2025 if (Init.isInvalid()) { 2026 FD->setInvalidDecl(); 2027 return; 2028 } 2029 2030 InitExpr = Init.release(); 2031 2032 FD->setInClassInitializer(InitExpr); 2033} 2034 2035/// \brief Find the direct and/or virtual base specifiers that 2036/// correspond to the given base type, for use in base initialization 2037/// within a constructor. 2038static bool FindBaseInitializer(Sema &SemaRef, 2039 CXXRecordDecl *ClassDecl, 2040 QualType BaseType, 2041 const CXXBaseSpecifier *&DirectBaseSpec, 2042 const CXXBaseSpecifier *&VirtualBaseSpec) { 2043 // First, check for a direct base class. 2044 DirectBaseSpec = 0; 2045 for (CXXRecordDecl::base_class_const_iterator Base 2046 = ClassDecl->bases_begin(); 2047 Base != ClassDecl->bases_end(); ++Base) { 2048 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2049 // We found a direct base of this type. That's what we're 2050 // initializing. 2051 DirectBaseSpec = &*Base; 2052 break; 2053 } 2054 } 2055 2056 // Check for a virtual base class. 2057 // FIXME: We might be able to short-circuit this if we know in advance that 2058 // there are no virtual bases. 2059 VirtualBaseSpec = 0; 2060 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2061 // We haven't found a base yet; search the class hierarchy for a 2062 // virtual base class. 2063 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2064 /*DetectVirtual=*/false); 2065 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2066 BaseType, Paths)) { 2067 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2068 Path != Paths.end(); ++Path) { 2069 if (Path->back().Base->isVirtual()) { 2070 VirtualBaseSpec = Path->back().Base; 2071 break; 2072 } 2073 } 2074 } 2075 } 2076 2077 return DirectBaseSpec || VirtualBaseSpec; 2078} 2079 2080/// \brief Handle a C++ member initializer using braced-init-list syntax. 2081MemInitResult 2082Sema::ActOnMemInitializer(Decl *ConstructorD, 2083 Scope *S, 2084 CXXScopeSpec &SS, 2085 IdentifierInfo *MemberOrBase, 2086 ParsedType TemplateTypeTy, 2087 const DeclSpec &DS, 2088 SourceLocation IdLoc, 2089 Expr *InitList, 2090 SourceLocation EllipsisLoc) { 2091 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2092 DS, IdLoc, InitList, 2093 EllipsisLoc); 2094} 2095 2096/// \brief Handle a C++ member initializer using parentheses syntax. 2097MemInitResult 2098Sema::ActOnMemInitializer(Decl *ConstructorD, 2099 Scope *S, 2100 CXXScopeSpec &SS, 2101 IdentifierInfo *MemberOrBase, 2102 ParsedType TemplateTypeTy, 2103 const DeclSpec &DS, 2104 SourceLocation IdLoc, 2105 SourceLocation LParenLoc, 2106 Expr **Args, unsigned NumArgs, 2107 SourceLocation RParenLoc, 2108 SourceLocation EllipsisLoc) { 2109 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2110 llvm::makeArrayRef(Args, NumArgs), 2111 RParenLoc); 2112 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2113 DS, IdLoc, List, EllipsisLoc); 2114} 2115 2116namespace { 2117 2118// Callback to only accept typo corrections that can be a valid C++ member 2119// intializer: either a non-static field member or a base class. 2120class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2121 public: 2122 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2123 : ClassDecl(ClassDecl) {} 2124 2125 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2126 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2127 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2128 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2129 else 2130 return isa<TypeDecl>(ND); 2131 } 2132 return false; 2133 } 2134 2135 private: 2136 CXXRecordDecl *ClassDecl; 2137}; 2138 2139} 2140 2141/// \brief Handle a C++ member initializer. 2142MemInitResult 2143Sema::BuildMemInitializer(Decl *ConstructorD, 2144 Scope *S, 2145 CXXScopeSpec &SS, 2146 IdentifierInfo *MemberOrBase, 2147 ParsedType TemplateTypeTy, 2148 const DeclSpec &DS, 2149 SourceLocation IdLoc, 2150 Expr *Init, 2151 SourceLocation EllipsisLoc) { 2152 if (!ConstructorD) 2153 return true; 2154 2155 AdjustDeclIfTemplate(ConstructorD); 2156 2157 CXXConstructorDecl *Constructor 2158 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2159 if (!Constructor) { 2160 // The user wrote a constructor initializer on a function that is 2161 // not a C++ constructor. Ignore the error for now, because we may 2162 // have more member initializers coming; we'll diagnose it just 2163 // once in ActOnMemInitializers. 2164 return true; 2165 } 2166 2167 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2168 2169 // C++ [class.base.init]p2: 2170 // Names in a mem-initializer-id are looked up in the scope of the 2171 // constructor's class and, if not found in that scope, are looked 2172 // up in the scope containing the constructor's definition. 2173 // [Note: if the constructor's class contains a member with the 2174 // same name as a direct or virtual base class of the class, a 2175 // mem-initializer-id naming the member or base class and composed 2176 // of a single identifier refers to the class member. A 2177 // mem-initializer-id for the hidden base class may be specified 2178 // using a qualified name. ] 2179 if (!SS.getScopeRep() && !TemplateTypeTy) { 2180 // Look for a member, first. 2181 DeclContext::lookup_result Result 2182 = ClassDecl->lookup(MemberOrBase); 2183 if (!Result.empty()) { 2184 ValueDecl *Member; 2185 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2186 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2187 if (EllipsisLoc.isValid()) 2188 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2189 << MemberOrBase 2190 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2191 2192 return BuildMemberInitializer(Member, Init, IdLoc); 2193 } 2194 } 2195 } 2196 // It didn't name a member, so see if it names a class. 2197 QualType BaseType; 2198 TypeSourceInfo *TInfo = 0; 2199 2200 if (TemplateTypeTy) { 2201 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2202 } else if (DS.getTypeSpecType() == TST_decltype) { 2203 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2204 } else { 2205 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2206 LookupParsedName(R, S, &SS); 2207 2208 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2209 if (!TyD) { 2210 if (R.isAmbiguous()) return true; 2211 2212 // We don't want access-control diagnostics here. 2213 R.suppressDiagnostics(); 2214 2215 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2216 bool NotUnknownSpecialization = false; 2217 DeclContext *DC = computeDeclContext(SS, false); 2218 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2219 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2220 2221 if (!NotUnknownSpecialization) { 2222 // When the scope specifier can refer to a member of an unknown 2223 // specialization, we take it as a type name. 2224 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2225 SS.getWithLocInContext(Context), 2226 *MemberOrBase, IdLoc); 2227 if (BaseType.isNull()) 2228 return true; 2229 2230 R.clear(); 2231 R.setLookupName(MemberOrBase); 2232 } 2233 } 2234 2235 // If no results were found, try to correct typos. 2236 TypoCorrection Corr; 2237 MemInitializerValidatorCCC Validator(ClassDecl); 2238 if (R.empty() && BaseType.isNull() && 2239 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2240 Validator, ClassDecl))) { 2241 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2242 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2243 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2244 // We have found a non-static data member with a similar 2245 // name to what was typed; complain and initialize that 2246 // member. 2247 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2248 << MemberOrBase << true << CorrectedQuotedStr 2249 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2250 Diag(Member->getLocation(), diag::note_previous_decl) 2251 << CorrectedQuotedStr; 2252 2253 return BuildMemberInitializer(Member, Init, IdLoc); 2254 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2255 const CXXBaseSpecifier *DirectBaseSpec; 2256 const CXXBaseSpecifier *VirtualBaseSpec; 2257 if (FindBaseInitializer(*this, ClassDecl, 2258 Context.getTypeDeclType(Type), 2259 DirectBaseSpec, VirtualBaseSpec)) { 2260 // We have found a direct or virtual base class with a 2261 // similar name to what was typed; complain and initialize 2262 // that base class. 2263 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2264 << MemberOrBase << false << CorrectedQuotedStr 2265 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2266 2267 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2268 : VirtualBaseSpec; 2269 Diag(BaseSpec->getLocStart(), 2270 diag::note_base_class_specified_here) 2271 << BaseSpec->getType() 2272 << BaseSpec->getSourceRange(); 2273 2274 TyD = Type; 2275 } 2276 } 2277 } 2278 2279 if (!TyD && BaseType.isNull()) { 2280 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2281 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2282 return true; 2283 } 2284 } 2285 2286 if (BaseType.isNull()) { 2287 BaseType = Context.getTypeDeclType(TyD); 2288 if (SS.isSet()) { 2289 NestedNameSpecifier *Qualifier = 2290 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2291 2292 // FIXME: preserve source range information 2293 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2294 } 2295 } 2296 } 2297 2298 if (!TInfo) 2299 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2300 2301 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2302} 2303 2304/// Checks a member initializer expression for cases where reference (or 2305/// pointer) members are bound to by-value parameters (or their addresses). 2306static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2307 Expr *Init, 2308 SourceLocation IdLoc) { 2309 QualType MemberTy = Member->getType(); 2310 2311 // We only handle pointers and references currently. 2312 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2313 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2314 return; 2315 2316 const bool IsPointer = MemberTy->isPointerType(); 2317 if (IsPointer) { 2318 if (const UnaryOperator *Op 2319 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2320 // The only case we're worried about with pointers requires taking the 2321 // address. 2322 if (Op->getOpcode() != UO_AddrOf) 2323 return; 2324 2325 Init = Op->getSubExpr(); 2326 } else { 2327 // We only handle address-of expression initializers for pointers. 2328 return; 2329 } 2330 } 2331 2332 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2333 // Taking the address of a temporary will be diagnosed as a hard error. 2334 if (IsPointer) 2335 return; 2336 2337 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2338 << Member << Init->getSourceRange(); 2339 } else if (const DeclRefExpr *DRE 2340 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2341 // We only warn when referring to a non-reference parameter declaration. 2342 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2343 if (!Parameter || Parameter->getType()->isReferenceType()) 2344 return; 2345 2346 S.Diag(Init->getExprLoc(), 2347 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2348 : diag::warn_bind_ref_member_to_parameter) 2349 << Member << Parameter << Init->getSourceRange(); 2350 } else { 2351 // Other initializers are fine. 2352 return; 2353 } 2354 2355 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2356 << (unsigned)IsPointer; 2357} 2358 2359MemInitResult 2360Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2361 SourceLocation IdLoc) { 2362 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2363 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2364 assert((DirectMember || IndirectMember) && 2365 "Member must be a FieldDecl or IndirectFieldDecl"); 2366 2367 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2368 return true; 2369 2370 if (Member->isInvalidDecl()) 2371 return true; 2372 2373 // Diagnose value-uses of fields to initialize themselves, e.g. 2374 // foo(foo) 2375 // where foo is not also a parameter to the constructor. 2376 // TODO: implement -Wuninitialized and fold this into that framework. 2377 Expr **Args; 2378 unsigned NumArgs; 2379 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2380 Args = ParenList->getExprs(); 2381 NumArgs = ParenList->getNumExprs(); 2382 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2383 Args = InitList->getInits(); 2384 NumArgs = InitList->getNumInits(); 2385 } else { 2386 // Template instantiation doesn't reconstruct ParenListExprs for us. 2387 Args = &Init; 2388 NumArgs = 1; 2389 } 2390 2391 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2392 != DiagnosticsEngine::Ignored) 2393 for (unsigned i = 0; i < NumArgs; ++i) 2394 // FIXME: Warn about the case when other fields are used before being 2395 // initialized. For example, let this field be the i'th field. When 2396 // initializing the i'th field, throw a warning if any of the >= i'th 2397 // fields are used, as they are not yet initialized. 2398 // Right now we are only handling the case where the i'th field uses 2399 // itself in its initializer. 2400 // Also need to take into account that some fields may be initialized by 2401 // in-class initializers, see C++11 [class.base.init]p9. 2402 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2403 2404 SourceRange InitRange = Init->getSourceRange(); 2405 2406 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2407 // Can't check initialization for a member of dependent type or when 2408 // any of the arguments are type-dependent expressions. 2409 DiscardCleanupsInEvaluationContext(); 2410 } else { 2411 bool InitList = false; 2412 if (isa<InitListExpr>(Init)) { 2413 InitList = true; 2414 Args = &Init; 2415 NumArgs = 1; 2416 2417 if (isStdInitializerList(Member->getType(), 0)) { 2418 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2419 << /*at end of ctor*/1 << InitRange; 2420 } 2421 } 2422 2423 // Initialize the member. 2424 InitializedEntity MemberEntity = 2425 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2426 : InitializedEntity::InitializeMember(IndirectMember, 0); 2427 InitializationKind Kind = 2428 InitList ? InitializationKind::CreateDirectList(IdLoc) 2429 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2430 InitRange.getEnd()); 2431 2432 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2433 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2434 MultiExprArg(Args, NumArgs), 2435 0); 2436 if (MemberInit.isInvalid()) 2437 return true; 2438 2439 // C++11 [class.base.init]p7: 2440 // The initialization of each base and member constitutes a 2441 // full-expression. 2442 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2443 if (MemberInit.isInvalid()) 2444 return true; 2445 2446 Init = MemberInit.get(); 2447 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2448 } 2449 2450 if (DirectMember) { 2451 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2452 InitRange.getBegin(), Init, 2453 InitRange.getEnd()); 2454 } else { 2455 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2456 InitRange.getBegin(), Init, 2457 InitRange.getEnd()); 2458 } 2459} 2460 2461MemInitResult 2462Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2463 CXXRecordDecl *ClassDecl) { 2464 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2465 if (!LangOpts.CPlusPlus11) 2466 return Diag(NameLoc, diag::err_delegating_ctor) 2467 << TInfo->getTypeLoc().getLocalSourceRange(); 2468 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2469 2470 bool InitList = true; 2471 Expr **Args = &Init; 2472 unsigned NumArgs = 1; 2473 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2474 InitList = false; 2475 Args = ParenList->getExprs(); 2476 NumArgs = ParenList->getNumExprs(); 2477 } 2478 2479 SourceRange InitRange = Init->getSourceRange(); 2480 // Initialize the object. 2481 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2482 QualType(ClassDecl->getTypeForDecl(), 0)); 2483 InitializationKind Kind = 2484 InitList ? InitializationKind::CreateDirectList(NameLoc) 2485 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2486 InitRange.getEnd()); 2487 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2488 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2489 MultiExprArg(Args, NumArgs), 2490 0); 2491 if (DelegationInit.isInvalid()) 2492 return true; 2493 2494 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2495 "Delegating constructor with no target?"); 2496 2497 // C++11 [class.base.init]p7: 2498 // The initialization of each base and member constitutes a 2499 // full-expression. 2500 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2501 InitRange.getBegin()); 2502 if (DelegationInit.isInvalid()) 2503 return true; 2504 2505 // If we are in a dependent context, template instantiation will 2506 // perform this type-checking again. Just save the arguments that we 2507 // received in a ParenListExpr. 2508 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2509 // of the information that we have about the base 2510 // initializer. However, deconstructing the ASTs is a dicey process, 2511 // and this approach is far more likely to get the corner cases right. 2512 if (CurContext->isDependentContext()) 2513 DelegationInit = Owned(Init); 2514 2515 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2516 DelegationInit.takeAs<Expr>(), 2517 InitRange.getEnd()); 2518} 2519 2520MemInitResult 2521Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2522 Expr *Init, CXXRecordDecl *ClassDecl, 2523 SourceLocation EllipsisLoc) { 2524 SourceLocation BaseLoc 2525 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2526 2527 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2528 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2529 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2530 2531 // C++ [class.base.init]p2: 2532 // [...] Unless the mem-initializer-id names a nonstatic data 2533 // member of the constructor's class or a direct or virtual base 2534 // of that class, the mem-initializer is ill-formed. A 2535 // mem-initializer-list can initialize a base class using any 2536 // name that denotes that base class type. 2537 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2538 2539 SourceRange InitRange = Init->getSourceRange(); 2540 if (EllipsisLoc.isValid()) { 2541 // This is a pack expansion. 2542 if (!BaseType->containsUnexpandedParameterPack()) { 2543 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2544 << SourceRange(BaseLoc, InitRange.getEnd()); 2545 2546 EllipsisLoc = SourceLocation(); 2547 } 2548 } else { 2549 // Check for any unexpanded parameter packs. 2550 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2551 return true; 2552 2553 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2554 return true; 2555 } 2556 2557 // Check for direct and virtual base classes. 2558 const CXXBaseSpecifier *DirectBaseSpec = 0; 2559 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2560 if (!Dependent) { 2561 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2562 BaseType)) 2563 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2564 2565 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2566 VirtualBaseSpec); 2567 2568 // C++ [base.class.init]p2: 2569 // Unless the mem-initializer-id names a nonstatic data member of the 2570 // constructor's class or a direct or virtual base of that class, the 2571 // mem-initializer is ill-formed. 2572 if (!DirectBaseSpec && !VirtualBaseSpec) { 2573 // If the class has any dependent bases, then it's possible that 2574 // one of those types will resolve to the same type as 2575 // BaseType. Therefore, just treat this as a dependent base 2576 // class initialization. FIXME: Should we try to check the 2577 // initialization anyway? It seems odd. 2578 if (ClassDecl->hasAnyDependentBases()) 2579 Dependent = true; 2580 else 2581 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2582 << BaseType << Context.getTypeDeclType(ClassDecl) 2583 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2584 } 2585 } 2586 2587 if (Dependent) { 2588 DiscardCleanupsInEvaluationContext(); 2589 2590 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2591 /*IsVirtual=*/false, 2592 InitRange.getBegin(), Init, 2593 InitRange.getEnd(), EllipsisLoc); 2594 } 2595 2596 // C++ [base.class.init]p2: 2597 // If a mem-initializer-id is ambiguous because it designates both 2598 // a direct non-virtual base class and an inherited virtual base 2599 // class, the mem-initializer is ill-formed. 2600 if (DirectBaseSpec && VirtualBaseSpec) 2601 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2602 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2603 2604 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2605 if (!BaseSpec) 2606 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2607 2608 // Initialize the base. 2609 bool InitList = true; 2610 Expr **Args = &Init; 2611 unsigned NumArgs = 1; 2612 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2613 InitList = false; 2614 Args = ParenList->getExprs(); 2615 NumArgs = ParenList->getNumExprs(); 2616 } 2617 2618 InitializedEntity BaseEntity = 2619 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2620 InitializationKind Kind = 2621 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2622 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2623 InitRange.getEnd()); 2624 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2625 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2626 MultiExprArg(Args, NumArgs), 0); 2627 if (BaseInit.isInvalid()) 2628 return true; 2629 2630 // C++11 [class.base.init]p7: 2631 // The initialization of each base and member constitutes a 2632 // full-expression. 2633 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2634 if (BaseInit.isInvalid()) 2635 return true; 2636 2637 // If we are in a dependent context, template instantiation will 2638 // perform this type-checking again. Just save the arguments that we 2639 // received in a ParenListExpr. 2640 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2641 // of the information that we have about the base 2642 // initializer. However, deconstructing the ASTs is a dicey process, 2643 // and this approach is far more likely to get the corner cases right. 2644 if (CurContext->isDependentContext()) 2645 BaseInit = Owned(Init); 2646 2647 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2648 BaseSpec->isVirtual(), 2649 InitRange.getBegin(), 2650 BaseInit.takeAs<Expr>(), 2651 InitRange.getEnd(), EllipsisLoc); 2652} 2653 2654// Create a static_cast\<T&&>(expr). 2655static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2656 if (T.isNull()) T = E->getType(); 2657 QualType TargetType = SemaRef.BuildReferenceType( 2658 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2659 SourceLocation ExprLoc = E->getLocStart(); 2660 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2661 TargetType, ExprLoc); 2662 2663 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2664 SourceRange(ExprLoc, ExprLoc), 2665 E->getSourceRange()).take(); 2666} 2667 2668/// ImplicitInitializerKind - How an implicit base or member initializer should 2669/// initialize its base or member. 2670enum ImplicitInitializerKind { 2671 IIK_Default, 2672 IIK_Copy, 2673 IIK_Move, 2674 IIK_Inherit 2675}; 2676 2677static bool 2678BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2679 ImplicitInitializerKind ImplicitInitKind, 2680 CXXBaseSpecifier *BaseSpec, 2681 bool IsInheritedVirtualBase, 2682 CXXCtorInitializer *&CXXBaseInit) { 2683 InitializedEntity InitEntity 2684 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2685 IsInheritedVirtualBase); 2686 2687 ExprResult BaseInit; 2688 2689 switch (ImplicitInitKind) { 2690 case IIK_Inherit: { 2691 const CXXRecordDecl *Inherited = 2692 Constructor->getInheritedConstructor()->getParent(); 2693 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2694 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2695 // C++11 [class.inhctor]p8: 2696 // Each expression in the expression-list is of the form 2697 // static_cast<T&&>(p), where p is the name of the corresponding 2698 // constructor parameter and T is the declared type of p. 2699 SmallVector<Expr*, 16> Args; 2700 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2701 ParmVarDecl *PD = Constructor->getParamDecl(I); 2702 ExprResult ArgExpr = 2703 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2704 VK_LValue, SourceLocation()); 2705 if (ArgExpr.isInvalid()) 2706 return true; 2707 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2708 } 2709 2710 InitializationKind InitKind = InitializationKind::CreateDirect( 2711 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2712 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2713 Args.data(), Args.size()); 2714 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2715 break; 2716 } 2717 } 2718 // Fall through. 2719 case IIK_Default: { 2720 InitializationKind InitKind 2721 = InitializationKind::CreateDefault(Constructor->getLocation()); 2722 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2723 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2724 break; 2725 } 2726 2727 case IIK_Move: 2728 case IIK_Copy: { 2729 bool Moving = ImplicitInitKind == IIK_Move; 2730 ParmVarDecl *Param = Constructor->getParamDecl(0); 2731 QualType ParamType = Param->getType().getNonReferenceType(); 2732 2733 Expr *CopyCtorArg = 2734 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2735 SourceLocation(), Param, false, 2736 Constructor->getLocation(), ParamType, 2737 VK_LValue, 0); 2738 2739 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2740 2741 // Cast to the base class to avoid ambiguities. 2742 QualType ArgTy = 2743 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2744 ParamType.getQualifiers()); 2745 2746 if (Moving) { 2747 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2748 } 2749 2750 CXXCastPath BasePath; 2751 BasePath.push_back(BaseSpec); 2752 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2753 CK_UncheckedDerivedToBase, 2754 Moving ? VK_XValue : VK_LValue, 2755 &BasePath).take(); 2756 2757 InitializationKind InitKind 2758 = InitializationKind::CreateDirect(Constructor->getLocation(), 2759 SourceLocation(), SourceLocation()); 2760 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2761 &CopyCtorArg, 1); 2762 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2763 MultiExprArg(&CopyCtorArg, 1)); 2764 break; 2765 } 2766 } 2767 2768 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2769 if (BaseInit.isInvalid()) 2770 return true; 2771 2772 CXXBaseInit = 2773 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2774 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2775 SourceLocation()), 2776 BaseSpec->isVirtual(), 2777 SourceLocation(), 2778 BaseInit.takeAs<Expr>(), 2779 SourceLocation(), 2780 SourceLocation()); 2781 2782 return false; 2783} 2784 2785static bool RefersToRValueRef(Expr *MemRef) { 2786 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2787 return Referenced->getType()->isRValueReferenceType(); 2788} 2789 2790static bool 2791BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2792 ImplicitInitializerKind ImplicitInitKind, 2793 FieldDecl *Field, IndirectFieldDecl *Indirect, 2794 CXXCtorInitializer *&CXXMemberInit) { 2795 if (Field->isInvalidDecl()) 2796 return true; 2797 2798 SourceLocation Loc = Constructor->getLocation(); 2799 2800 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2801 bool Moving = ImplicitInitKind == IIK_Move; 2802 ParmVarDecl *Param = Constructor->getParamDecl(0); 2803 QualType ParamType = Param->getType().getNonReferenceType(); 2804 2805 // Suppress copying zero-width bitfields. 2806 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2807 return false; 2808 2809 Expr *MemberExprBase = 2810 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2811 SourceLocation(), Param, false, 2812 Loc, ParamType, VK_LValue, 0); 2813 2814 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2815 2816 if (Moving) { 2817 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2818 } 2819 2820 // Build a reference to this field within the parameter. 2821 CXXScopeSpec SS; 2822 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2823 Sema::LookupMemberName); 2824 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2825 : cast<ValueDecl>(Field), AS_public); 2826 MemberLookup.resolveKind(); 2827 ExprResult CtorArg 2828 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2829 ParamType, Loc, 2830 /*IsArrow=*/false, 2831 SS, 2832 /*TemplateKWLoc=*/SourceLocation(), 2833 /*FirstQualifierInScope=*/0, 2834 MemberLookup, 2835 /*TemplateArgs=*/0); 2836 if (CtorArg.isInvalid()) 2837 return true; 2838 2839 // C++11 [class.copy]p15: 2840 // - if a member m has rvalue reference type T&&, it is direct-initialized 2841 // with static_cast<T&&>(x.m); 2842 if (RefersToRValueRef(CtorArg.get())) { 2843 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2844 } 2845 2846 // When the field we are copying is an array, create index variables for 2847 // each dimension of the array. We use these index variables to subscript 2848 // the source array, and other clients (e.g., CodeGen) will perform the 2849 // necessary iteration with these index variables. 2850 SmallVector<VarDecl *, 4> IndexVariables; 2851 QualType BaseType = Field->getType(); 2852 QualType SizeType = SemaRef.Context.getSizeType(); 2853 bool InitializingArray = false; 2854 while (const ConstantArrayType *Array 2855 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2856 InitializingArray = true; 2857 // Create the iteration variable for this array index. 2858 IdentifierInfo *IterationVarName = 0; 2859 { 2860 SmallString<8> Str; 2861 llvm::raw_svector_ostream OS(Str); 2862 OS << "__i" << IndexVariables.size(); 2863 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2864 } 2865 VarDecl *IterationVar 2866 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2867 IterationVarName, SizeType, 2868 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2869 SC_None); 2870 IndexVariables.push_back(IterationVar); 2871 2872 // Create a reference to the iteration variable. 2873 ExprResult IterationVarRef 2874 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2875 assert(!IterationVarRef.isInvalid() && 2876 "Reference to invented variable cannot fail!"); 2877 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2878 assert(!IterationVarRef.isInvalid() && 2879 "Conversion of invented variable cannot fail!"); 2880 2881 // Subscript the array with this iteration variable. 2882 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2883 IterationVarRef.take(), 2884 Loc); 2885 if (CtorArg.isInvalid()) 2886 return true; 2887 2888 BaseType = Array->getElementType(); 2889 } 2890 2891 // The array subscript expression is an lvalue, which is wrong for moving. 2892 if (Moving && InitializingArray) 2893 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2894 2895 // Construct the entity that we will be initializing. For an array, this 2896 // will be first element in the array, which may require several levels 2897 // of array-subscript entities. 2898 SmallVector<InitializedEntity, 4> Entities; 2899 Entities.reserve(1 + IndexVariables.size()); 2900 if (Indirect) 2901 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2902 else 2903 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2904 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2905 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2906 0, 2907 Entities.back())); 2908 2909 // Direct-initialize to use the copy constructor. 2910 InitializationKind InitKind = 2911 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2912 2913 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2914 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2915 &CtorArgE, 1); 2916 2917 ExprResult MemberInit 2918 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2919 MultiExprArg(&CtorArgE, 1)); 2920 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2921 if (MemberInit.isInvalid()) 2922 return true; 2923 2924 if (Indirect) { 2925 assert(IndexVariables.size() == 0 && 2926 "Indirect field improperly initialized"); 2927 CXXMemberInit 2928 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2929 Loc, Loc, 2930 MemberInit.takeAs<Expr>(), 2931 Loc); 2932 } else 2933 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2934 Loc, MemberInit.takeAs<Expr>(), 2935 Loc, 2936 IndexVariables.data(), 2937 IndexVariables.size()); 2938 return false; 2939 } 2940 2941 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 2942 "Unhandled implicit init kind!"); 2943 2944 QualType FieldBaseElementType = 2945 SemaRef.Context.getBaseElementType(Field->getType()); 2946 2947 if (FieldBaseElementType->isRecordType()) { 2948 InitializedEntity InitEntity 2949 = Indirect? InitializedEntity::InitializeMember(Indirect) 2950 : InitializedEntity::InitializeMember(Field); 2951 InitializationKind InitKind = 2952 InitializationKind::CreateDefault(Loc); 2953 2954 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2955 ExprResult MemberInit = 2956 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2957 2958 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2959 if (MemberInit.isInvalid()) 2960 return true; 2961 2962 if (Indirect) 2963 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2964 Indirect, Loc, 2965 Loc, 2966 MemberInit.get(), 2967 Loc); 2968 else 2969 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2970 Field, Loc, Loc, 2971 MemberInit.get(), 2972 Loc); 2973 return false; 2974 } 2975 2976 if (!Field->getParent()->isUnion()) { 2977 if (FieldBaseElementType->isReferenceType()) { 2978 SemaRef.Diag(Constructor->getLocation(), 2979 diag::err_uninitialized_member_in_ctor) 2980 << (int)Constructor->isImplicit() 2981 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2982 << 0 << Field->getDeclName(); 2983 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2984 return true; 2985 } 2986 2987 if (FieldBaseElementType.isConstQualified()) { 2988 SemaRef.Diag(Constructor->getLocation(), 2989 diag::err_uninitialized_member_in_ctor) 2990 << (int)Constructor->isImplicit() 2991 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2992 << 1 << Field->getDeclName(); 2993 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2994 return true; 2995 } 2996 } 2997 2998 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2999 FieldBaseElementType->isObjCRetainableType() && 3000 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 3001 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 3002 // ARC: 3003 // Default-initialize Objective-C pointers to NULL. 3004 CXXMemberInit 3005 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3006 Loc, Loc, 3007 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 3008 Loc); 3009 return false; 3010 } 3011 3012 // Nothing to initialize. 3013 CXXMemberInit = 0; 3014 return false; 3015} 3016 3017namespace { 3018struct BaseAndFieldInfo { 3019 Sema &S; 3020 CXXConstructorDecl *Ctor; 3021 bool AnyErrorsInInits; 3022 ImplicitInitializerKind IIK; 3023 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3024 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3025 3026 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3027 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3028 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3029 if (Generated && Ctor->isCopyConstructor()) 3030 IIK = IIK_Copy; 3031 else if (Generated && Ctor->isMoveConstructor()) 3032 IIK = IIK_Move; 3033 else if (Ctor->getInheritedConstructor()) 3034 IIK = IIK_Inherit; 3035 else 3036 IIK = IIK_Default; 3037 } 3038 3039 bool isImplicitCopyOrMove() const { 3040 switch (IIK) { 3041 case IIK_Copy: 3042 case IIK_Move: 3043 return true; 3044 3045 case IIK_Default: 3046 case IIK_Inherit: 3047 return false; 3048 } 3049 3050 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3051 } 3052 3053 bool addFieldInitializer(CXXCtorInitializer *Init) { 3054 AllToInit.push_back(Init); 3055 3056 // Check whether this initializer makes the field "used". 3057 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 3058 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3059 3060 return false; 3061 } 3062}; 3063} 3064 3065/// \brief Determine whether the given indirect field declaration is somewhere 3066/// within an anonymous union. 3067static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3068 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3069 CEnd = F->chain_end(); 3070 C != CEnd; ++C) 3071 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3072 if (Record->isUnion()) 3073 return true; 3074 3075 return false; 3076} 3077 3078/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3079/// array type. 3080static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3081 if (T->isIncompleteArrayType()) 3082 return true; 3083 3084 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3085 if (!ArrayT->getSize()) 3086 return true; 3087 3088 T = ArrayT->getElementType(); 3089 } 3090 3091 return false; 3092} 3093 3094static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3095 FieldDecl *Field, 3096 IndirectFieldDecl *Indirect = 0) { 3097 3098 // Overwhelmingly common case: we have a direct initializer for this field. 3099 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3100 return Info.addFieldInitializer(Init); 3101 3102 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3103 // has a brace-or-equal-initializer, the entity is initialized as specified 3104 // in [dcl.init]. 3105 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3106 CXXCtorInitializer *Init; 3107 if (Indirect) 3108 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3109 SourceLocation(), 3110 SourceLocation(), 0, 3111 SourceLocation()); 3112 else 3113 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3114 SourceLocation(), 3115 SourceLocation(), 0, 3116 SourceLocation()); 3117 return Info.addFieldInitializer(Init); 3118 } 3119 3120 // Don't build an implicit initializer for union members if none was 3121 // explicitly specified. 3122 if (Field->getParent()->isUnion() || 3123 (Indirect && isWithinAnonymousUnion(Indirect))) 3124 return false; 3125 3126 // Don't initialize incomplete or zero-length arrays. 3127 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3128 return false; 3129 3130 // Don't try to build an implicit initializer if there were semantic 3131 // errors in any of the initializers (and therefore we might be 3132 // missing some that the user actually wrote). 3133 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3134 return false; 3135 3136 CXXCtorInitializer *Init = 0; 3137 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3138 Indirect, Init)) 3139 return true; 3140 3141 if (!Init) 3142 return false; 3143 3144 return Info.addFieldInitializer(Init); 3145} 3146 3147bool 3148Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3149 CXXCtorInitializer *Initializer) { 3150 assert(Initializer->isDelegatingInitializer()); 3151 Constructor->setNumCtorInitializers(1); 3152 CXXCtorInitializer **initializer = 3153 new (Context) CXXCtorInitializer*[1]; 3154 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3155 Constructor->setCtorInitializers(initializer); 3156 3157 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3158 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3159 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3160 } 3161 3162 DelegatingCtorDecls.push_back(Constructor); 3163 3164 return false; 3165} 3166 3167bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3168 ArrayRef<CXXCtorInitializer *> Initializers) { 3169 if (Constructor->isDependentContext()) { 3170 // Just store the initializers as written, they will be checked during 3171 // instantiation. 3172 if (!Initializers.empty()) { 3173 Constructor->setNumCtorInitializers(Initializers.size()); 3174 CXXCtorInitializer **baseOrMemberInitializers = 3175 new (Context) CXXCtorInitializer*[Initializers.size()]; 3176 memcpy(baseOrMemberInitializers, Initializers.data(), 3177 Initializers.size() * sizeof(CXXCtorInitializer*)); 3178 Constructor->setCtorInitializers(baseOrMemberInitializers); 3179 } 3180 3181 // Let template instantiation know whether we had errors. 3182 if (AnyErrors) 3183 Constructor->setInvalidDecl(); 3184 3185 return false; 3186 } 3187 3188 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3189 3190 // We need to build the initializer AST according to order of construction 3191 // and not what user specified in the Initializers list. 3192 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3193 if (!ClassDecl) 3194 return true; 3195 3196 bool HadError = false; 3197 3198 for (unsigned i = 0; i < Initializers.size(); i++) { 3199 CXXCtorInitializer *Member = Initializers[i]; 3200 3201 if (Member->isBaseInitializer()) 3202 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3203 else 3204 Info.AllBaseFields[Member->getAnyMember()] = Member; 3205 } 3206 3207 // Keep track of the direct virtual bases. 3208 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3209 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3210 E = ClassDecl->bases_end(); I != E; ++I) { 3211 if (I->isVirtual()) 3212 DirectVBases.insert(I); 3213 } 3214 3215 // Push virtual bases before others. 3216 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3217 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3218 3219 if (CXXCtorInitializer *Value 3220 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3221 Info.AllToInit.push_back(Value); 3222 } else if (!AnyErrors) { 3223 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3224 CXXCtorInitializer *CXXBaseInit; 3225 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3226 VBase, IsInheritedVirtualBase, 3227 CXXBaseInit)) { 3228 HadError = true; 3229 continue; 3230 } 3231 3232 Info.AllToInit.push_back(CXXBaseInit); 3233 } 3234 } 3235 3236 // Non-virtual bases. 3237 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3238 E = ClassDecl->bases_end(); Base != E; ++Base) { 3239 // Virtuals are in the virtual base list and already constructed. 3240 if (Base->isVirtual()) 3241 continue; 3242 3243 if (CXXCtorInitializer *Value 3244 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3245 Info.AllToInit.push_back(Value); 3246 } else if (!AnyErrors) { 3247 CXXCtorInitializer *CXXBaseInit; 3248 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3249 Base, /*IsInheritedVirtualBase=*/false, 3250 CXXBaseInit)) { 3251 HadError = true; 3252 continue; 3253 } 3254 3255 Info.AllToInit.push_back(CXXBaseInit); 3256 } 3257 } 3258 3259 // Fields. 3260 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3261 MemEnd = ClassDecl->decls_end(); 3262 Mem != MemEnd; ++Mem) { 3263 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3264 // C++ [class.bit]p2: 3265 // A declaration for a bit-field that omits the identifier declares an 3266 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3267 // initialized. 3268 if (F->isUnnamedBitfield()) 3269 continue; 3270 3271 // If we're not generating the implicit copy/move constructor, then we'll 3272 // handle anonymous struct/union fields based on their individual 3273 // indirect fields. 3274 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3275 continue; 3276 3277 if (CollectFieldInitializer(*this, Info, F)) 3278 HadError = true; 3279 continue; 3280 } 3281 3282 // Beyond this point, we only consider default initialization. 3283 if (Info.isImplicitCopyOrMove()) 3284 continue; 3285 3286 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3287 if (F->getType()->isIncompleteArrayType()) { 3288 assert(ClassDecl->hasFlexibleArrayMember() && 3289 "Incomplete array type is not valid"); 3290 continue; 3291 } 3292 3293 // Initialize each field of an anonymous struct individually. 3294 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3295 HadError = true; 3296 3297 continue; 3298 } 3299 } 3300 3301 unsigned NumInitializers = Info.AllToInit.size(); 3302 if (NumInitializers > 0) { 3303 Constructor->setNumCtorInitializers(NumInitializers); 3304 CXXCtorInitializer **baseOrMemberInitializers = 3305 new (Context) CXXCtorInitializer*[NumInitializers]; 3306 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3307 NumInitializers * sizeof(CXXCtorInitializer*)); 3308 Constructor->setCtorInitializers(baseOrMemberInitializers); 3309 3310 // Constructors implicitly reference the base and member 3311 // destructors. 3312 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3313 Constructor->getParent()); 3314 } 3315 3316 return HadError; 3317} 3318 3319static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3320 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3321 const RecordDecl *RD = RT->getDecl(); 3322 if (RD->isAnonymousStructOrUnion()) { 3323 for (RecordDecl::field_iterator Field = RD->field_begin(), 3324 E = RD->field_end(); Field != E; ++Field) 3325 PopulateKeysForFields(*Field, IdealInits); 3326 return; 3327 } 3328 } 3329 IdealInits.push_back(Field); 3330} 3331 3332static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3333 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3334} 3335 3336static void *GetKeyForMember(ASTContext &Context, 3337 CXXCtorInitializer *Member) { 3338 if (!Member->isAnyMemberInitializer()) 3339 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3340 3341 return Member->getAnyMember(); 3342} 3343 3344static void DiagnoseBaseOrMemInitializerOrder( 3345 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3346 ArrayRef<CXXCtorInitializer *> Inits) { 3347 if (Constructor->getDeclContext()->isDependentContext()) 3348 return; 3349 3350 // Don't check initializers order unless the warning is enabled at the 3351 // location of at least one initializer. 3352 bool ShouldCheckOrder = false; 3353 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3354 CXXCtorInitializer *Init = Inits[InitIndex]; 3355 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3356 Init->getSourceLocation()) 3357 != DiagnosticsEngine::Ignored) { 3358 ShouldCheckOrder = true; 3359 break; 3360 } 3361 } 3362 if (!ShouldCheckOrder) 3363 return; 3364 3365 // Build the list of bases and members in the order that they'll 3366 // actually be initialized. The explicit initializers should be in 3367 // this same order but may be missing things. 3368 SmallVector<const void*, 32> IdealInitKeys; 3369 3370 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3371 3372 // 1. Virtual bases. 3373 for (CXXRecordDecl::base_class_const_iterator VBase = 3374 ClassDecl->vbases_begin(), 3375 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3376 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3377 3378 // 2. Non-virtual bases. 3379 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3380 E = ClassDecl->bases_end(); Base != E; ++Base) { 3381 if (Base->isVirtual()) 3382 continue; 3383 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3384 } 3385 3386 // 3. Direct fields. 3387 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3388 E = ClassDecl->field_end(); Field != E; ++Field) { 3389 if (Field->isUnnamedBitfield()) 3390 continue; 3391 3392 PopulateKeysForFields(*Field, IdealInitKeys); 3393 } 3394 3395 unsigned NumIdealInits = IdealInitKeys.size(); 3396 unsigned IdealIndex = 0; 3397 3398 CXXCtorInitializer *PrevInit = 0; 3399 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3400 CXXCtorInitializer *Init = Inits[InitIndex]; 3401 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3402 3403 // Scan forward to try to find this initializer in the idealized 3404 // initializers list. 3405 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3406 if (InitKey == IdealInitKeys[IdealIndex]) 3407 break; 3408 3409 // If we didn't find this initializer, it must be because we 3410 // scanned past it on a previous iteration. That can only 3411 // happen if we're out of order; emit a warning. 3412 if (IdealIndex == NumIdealInits && PrevInit) { 3413 Sema::SemaDiagnosticBuilder D = 3414 SemaRef.Diag(PrevInit->getSourceLocation(), 3415 diag::warn_initializer_out_of_order); 3416 3417 if (PrevInit->isAnyMemberInitializer()) 3418 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3419 else 3420 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3421 3422 if (Init->isAnyMemberInitializer()) 3423 D << 0 << Init->getAnyMember()->getDeclName(); 3424 else 3425 D << 1 << Init->getTypeSourceInfo()->getType(); 3426 3427 // Move back to the initializer's location in the ideal list. 3428 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3429 if (InitKey == IdealInitKeys[IdealIndex]) 3430 break; 3431 3432 assert(IdealIndex != NumIdealInits && 3433 "initializer not found in initializer list"); 3434 } 3435 3436 PrevInit = Init; 3437 } 3438} 3439 3440namespace { 3441bool CheckRedundantInit(Sema &S, 3442 CXXCtorInitializer *Init, 3443 CXXCtorInitializer *&PrevInit) { 3444 if (!PrevInit) { 3445 PrevInit = Init; 3446 return false; 3447 } 3448 3449 if (FieldDecl *Field = Init->getAnyMember()) 3450 S.Diag(Init->getSourceLocation(), 3451 diag::err_multiple_mem_initialization) 3452 << Field->getDeclName() 3453 << Init->getSourceRange(); 3454 else { 3455 const Type *BaseClass = Init->getBaseClass(); 3456 assert(BaseClass && "neither field nor base"); 3457 S.Diag(Init->getSourceLocation(), 3458 diag::err_multiple_base_initialization) 3459 << QualType(BaseClass, 0) 3460 << Init->getSourceRange(); 3461 } 3462 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3463 << 0 << PrevInit->getSourceRange(); 3464 3465 return true; 3466} 3467 3468typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3469typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3470 3471bool CheckRedundantUnionInit(Sema &S, 3472 CXXCtorInitializer *Init, 3473 RedundantUnionMap &Unions) { 3474 FieldDecl *Field = Init->getAnyMember(); 3475 RecordDecl *Parent = Field->getParent(); 3476 NamedDecl *Child = Field; 3477 3478 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3479 if (Parent->isUnion()) { 3480 UnionEntry &En = Unions[Parent]; 3481 if (En.first && En.first != Child) { 3482 S.Diag(Init->getSourceLocation(), 3483 diag::err_multiple_mem_union_initialization) 3484 << Field->getDeclName() 3485 << Init->getSourceRange(); 3486 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3487 << 0 << En.second->getSourceRange(); 3488 return true; 3489 } 3490 if (!En.first) { 3491 En.first = Child; 3492 En.second = Init; 3493 } 3494 if (!Parent->isAnonymousStructOrUnion()) 3495 return false; 3496 } 3497 3498 Child = Parent; 3499 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3500 } 3501 3502 return false; 3503} 3504} 3505 3506/// ActOnMemInitializers - Handle the member initializers for a constructor. 3507void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3508 SourceLocation ColonLoc, 3509 ArrayRef<CXXCtorInitializer*> MemInits, 3510 bool AnyErrors) { 3511 if (!ConstructorDecl) 3512 return; 3513 3514 AdjustDeclIfTemplate(ConstructorDecl); 3515 3516 CXXConstructorDecl *Constructor 3517 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3518 3519 if (!Constructor) { 3520 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3521 return; 3522 } 3523 3524 // Mapping for the duplicate initializers check. 3525 // For member initializers, this is keyed with a FieldDecl*. 3526 // For base initializers, this is keyed with a Type*. 3527 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3528 3529 // Mapping for the inconsistent anonymous-union initializers check. 3530 RedundantUnionMap MemberUnions; 3531 3532 bool HadError = false; 3533 for (unsigned i = 0; i < MemInits.size(); i++) { 3534 CXXCtorInitializer *Init = MemInits[i]; 3535 3536 // Set the source order index. 3537 Init->setSourceOrder(i); 3538 3539 if (Init->isAnyMemberInitializer()) { 3540 FieldDecl *Field = Init->getAnyMember(); 3541 if (CheckRedundantInit(*this, Init, Members[Field]) || 3542 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3543 HadError = true; 3544 } else if (Init->isBaseInitializer()) { 3545 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3546 if (CheckRedundantInit(*this, Init, Members[Key])) 3547 HadError = true; 3548 } else { 3549 assert(Init->isDelegatingInitializer()); 3550 // This must be the only initializer 3551 if (MemInits.size() != 1) { 3552 Diag(Init->getSourceLocation(), 3553 diag::err_delegating_initializer_alone) 3554 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3555 // We will treat this as being the only initializer. 3556 } 3557 SetDelegatingInitializer(Constructor, MemInits[i]); 3558 // Return immediately as the initializer is set. 3559 return; 3560 } 3561 } 3562 3563 if (HadError) 3564 return; 3565 3566 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3567 3568 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3569} 3570 3571void 3572Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3573 CXXRecordDecl *ClassDecl) { 3574 // Ignore dependent contexts. Also ignore unions, since their members never 3575 // have destructors implicitly called. 3576 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3577 return; 3578 3579 // FIXME: all the access-control diagnostics are positioned on the 3580 // field/base declaration. That's probably good; that said, the 3581 // user might reasonably want to know why the destructor is being 3582 // emitted, and we currently don't say. 3583 3584 // Non-static data members. 3585 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3586 E = ClassDecl->field_end(); I != E; ++I) { 3587 FieldDecl *Field = *I; 3588 if (Field->isInvalidDecl()) 3589 continue; 3590 3591 // Don't destroy incomplete or zero-length arrays. 3592 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3593 continue; 3594 3595 QualType FieldType = Context.getBaseElementType(Field->getType()); 3596 3597 const RecordType* RT = FieldType->getAs<RecordType>(); 3598 if (!RT) 3599 continue; 3600 3601 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3602 if (FieldClassDecl->isInvalidDecl()) 3603 continue; 3604 if (FieldClassDecl->hasIrrelevantDestructor()) 3605 continue; 3606 // The destructor for an implicit anonymous union member is never invoked. 3607 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3608 continue; 3609 3610 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3611 assert(Dtor && "No dtor found for FieldClassDecl!"); 3612 CheckDestructorAccess(Field->getLocation(), Dtor, 3613 PDiag(diag::err_access_dtor_field) 3614 << Field->getDeclName() 3615 << FieldType); 3616 3617 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3618 DiagnoseUseOfDecl(Dtor, Location); 3619 } 3620 3621 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3622 3623 // Bases. 3624 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3625 E = ClassDecl->bases_end(); Base != E; ++Base) { 3626 // Bases are always records in a well-formed non-dependent class. 3627 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3628 3629 // Remember direct virtual bases. 3630 if (Base->isVirtual()) 3631 DirectVirtualBases.insert(RT); 3632 3633 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3634 // If our base class is invalid, we probably can't get its dtor anyway. 3635 if (BaseClassDecl->isInvalidDecl()) 3636 continue; 3637 if (BaseClassDecl->hasIrrelevantDestructor()) 3638 continue; 3639 3640 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3641 assert(Dtor && "No dtor found for BaseClassDecl!"); 3642 3643 // FIXME: caret should be on the start of the class name 3644 CheckDestructorAccess(Base->getLocStart(), Dtor, 3645 PDiag(diag::err_access_dtor_base) 3646 << Base->getType() 3647 << Base->getSourceRange(), 3648 Context.getTypeDeclType(ClassDecl)); 3649 3650 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3651 DiagnoseUseOfDecl(Dtor, Location); 3652 } 3653 3654 // Virtual bases. 3655 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3656 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3657 3658 // Bases are always records in a well-formed non-dependent class. 3659 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3660 3661 // Ignore direct virtual bases. 3662 if (DirectVirtualBases.count(RT)) 3663 continue; 3664 3665 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3666 // If our base class is invalid, we probably can't get its dtor anyway. 3667 if (BaseClassDecl->isInvalidDecl()) 3668 continue; 3669 if (BaseClassDecl->hasIrrelevantDestructor()) 3670 continue; 3671 3672 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3673 assert(Dtor && "No dtor found for BaseClassDecl!"); 3674 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3675 PDiag(diag::err_access_dtor_vbase) 3676 << VBase->getType(), 3677 Context.getTypeDeclType(ClassDecl)); 3678 3679 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3680 DiagnoseUseOfDecl(Dtor, Location); 3681 } 3682} 3683 3684void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3685 if (!CDtorDecl) 3686 return; 3687 3688 if (CXXConstructorDecl *Constructor 3689 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3690 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3691} 3692 3693bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3694 unsigned DiagID, AbstractDiagSelID SelID) { 3695 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3696 unsigned DiagID; 3697 AbstractDiagSelID SelID; 3698 3699 public: 3700 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3701 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3702 3703 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3704 if (Suppressed) return; 3705 if (SelID == -1) 3706 S.Diag(Loc, DiagID) << T; 3707 else 3708 S.Diag(Loc, DiagID) << SelID << T; 3709 } 3710 } Diagnoser(DiagID, SelID); 3711 3712 return RequireNonAbstractType(Loc, T, Diagnoser); 3713} 3714 3715bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3716 TypeDiagnoser &Diagnoser) { 3717 if (!getLangOpts().CPlusPlus) 3718 return false; 3719 3720 if (const ArrayType *AT = Context.getAsArrayType(T)) 3721 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3722 3723 if (const PointerType *PT = T->getAs<PointerType>()) { 3724 // Find the innermost pointer type. 3725 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3726 PT = T; 3727 3728 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3729 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3730 } 3731 3732 const RecordType *RT = T->getAs<RecordType>(); 3733 if (!RT) 3734 return false; 3735 3736 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3737 3738 // We can't answer whether something is abstract until it has a 3739 // definition. If it's currently being defined, we'll walk back 3740 // over all the declarations when we have a full definition. 3741 const CXXRecordDecl *Def = RD->getDefinition(); 3742 if (!Def || Def->isBeingDefined()) 3743 return false; 3744 3745 if (!RD->isAbstract()) 3746 return false; 3747 3748 Diagnoser.diagnose(*this, Loc, T); 3749 DiagnoseAbstractType(RD); 3750 3751 return true; 3752} 3753 3754void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3755 // Check if we've already emitted the list of pure virtual functions 3756 // for this class. 3757 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3758 return; 3759 3760 CXXFinalOverriderMap FinalOverriders; 3761 RD->getFinalOverriders(FinalOverriders); 3762 3763 // Keep a set of seen pure methods so we won't diagnose the same method 3764 // more than once. 3765 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3766 3767 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3768 MEnd = FinalOverriders.end(); 3769 M != MEnd; 3770 ++M) { 3771 for (OverridingMethods::iterator SO = M->second.begin(), 3772 SOEnd = M->second.end(); 3773 SO != SOEnd; ++SO) { 3774 // C++ [class.abstract]p4: 3775 // A class is abstract if it contains or inherits at least one 3776 // pure virtual function for which the final overrider is pure 3777 // virtual. 3778 3779 // 3780 if (SO->second.size() != 1) 3781 continue; 3782 3783 if (!SO->second.front().Method->isPure()) 3784 continue; 3785 3786 if (!SeenPureMethods.insert(SO->second.front().Method)) 3787 continue; 3788 3789 Diag(SO->second.front().Method->getLocation(), 3790 diag::note_pure_virtual_function) 3791 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3792 } 3793 } 3794 3795 if (!PureVirtualClassDiagSet) 3796 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3797 PureVirtualClassDiagSet->insert(RD); 3798} 3799 3800namespace { 3801struct AbstractUsageInfo { 3802 Sema &S; 3803 CXXRecordDecl *Record; 3804 CanQualType AbstractType; 3805 bool Invalid; 3806 3807 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3808 : S(S), Record(Record), 3809 AbstractType(S.Context.getCanonicalType( 3810 S.Context.getTypeDeclType(Record))), 3811 Invalid(false) {} 3812 3813 void DiagnoseAbstractType() { 3814 if (Invalid) return; 3815 S.DiagnoseAbstractType(Record); 3816 Invalid = true; 3817 } 3818 3819 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3820}; 3821 3822struct CheckAbstractUsage { 3823 AbstractUsageInfo &Info; 3824 const NamedDecl *Ctx; 3825 3826 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3827 : Info(Info), Ctx(Ctx) {} 3828 3829 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3830 switch (TL.getTypeLocClass()) { 3831#define ABSTRACT_TYPELOC(CLASS, PARENT) 3832#define TYPELOC(CLASS, PARENT) \ 3833 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3834#include "clang/AST/TypeLocNodes.def" 3835 } 3836 } 3837 3838 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3839 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3840 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3841 if (!TL.getArg(I)) 3842 continue; 3843 3844 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3845 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3846 } 3847 } 3848 3849 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3850 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3851 } 3852 3853 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3854 // Visit the type parameters from a permissive context. 3855 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3856 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3857 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3858 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3859 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3860 // TODO: other template argument types? 3861 } 3862 } 3863 3864 // Visit pointee types from a permissive context. 3865#define CheckPolymorphic(Type) \ 3866 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3867 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3868 } 3869 CheckPolymorphic(PointerTypeLoc) 3870 CheckPolymorphic(ReferenceTypeLoc) 3871 CheckPolymorphic(MemberPointerTypeLoc) 3872 CheckPolymorphic(BlockPointerTypeLoc) 3873 CheckPolymorphic(AtomicTypeLoc) 3874 3875 /// Handle all the types we haven't given a more specific 3876 /// implementation for above. 3877 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3878 // Every other kind of type that we haven't called out already 3879 // that has an inner type is either (1) sugar or (2) contains that 3880 // inner type in some way as a subobject. 3881 if (TypeLoc Next = TL.getNextTypeLoc()) 3882 return Visit(Next, Sel); 3883 3884 // If there's no inner type and we're in a permissive context, 3885 // don't diagnose. 3886 if (Sel == Sema::AbstractNone) return; 3887 3888 // Check whether the type matches the abstract type. 3889 QualType T = TL.getType(); 3890 if (T->isArrayType()) { 3891 Sel = Sema::AbstractArrayType; 3892 T = Info.S.Context.getBaseElementType(T); 3893 } 3894 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3895 if (CT != Info.AbstractType) return; 3896 3897 // It matched; do some magic. 3898 if (Sel == Sema::AbstractArrayType) { 3899 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3900 << T << TL.getSourceRange(); 3901 } else { 3902 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3903 << Sel << T << TL.getSourceRange(); 3904 } 3905 Info.DiagnoseAbstractType(); 3906 } 3907}; 3908 3909void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3910 Sema::AbstractDiagSelID Sel) { 3911 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3912} 3913 3914} 3915 3916/// Check for invalid uses of an abstract type in a method declaration. 3917static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3918 CXXMethodDecl *MD) { 3919 // No need to do the check on definitions, which require that 3920 // the return/param types be complete. 3921 if (MD->doesThisDeclarationHaveABody()) 3922 return; 3923 3924 // For safety's sake, just ignore it if we don't have type source 3925 // information. This should never happen for non-implicit methods, 3926 // but... 3927 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3928 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3929} 3930 3931/// Check for invalid uses of an abstract type within a class definition. 3932static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3933 CXXRecordDecl *RD) { 3934 for (CXXRecordDecl::decl_iterator 3935 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3936 Decl *D = *I; 3937 if (D->isImplicit()) continue; 3938 3939 // Methods and method templates. 3940 if (isa<CXXMethodDecl>(D)) { 3941 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3942 } else if (isa<FunctionTemplateDecl>(D)) { 3943 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3944 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3945 3946 // Fields and static variables. 3947 } else if (isa<FieldDecl>(D)) { 3948 FieldDecl *FD = cast<FieldDecl>(D); 3949 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3950 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3951 } else if (isa<VarDecl>(D)) { 3952 VarDecl *VD = cast<VarDecl>(D); 3953 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3954 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3955 3956 // Nested classes and class templates. 3957 } else if (isa<CXXRecordDecl>(D)) { 3958 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3959 } else if (isa<ClassTemplateDecl>(D)) { 3960 CheckAbstractClassUsage(Info, 3961 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3962 } 3963 } 3964} 3965 3966/// \brief Perform semantic checks on a class definition that has been 3967/// completing, introducing implicitly-declared members, checking for 3968/// abstract types, etc. 3969void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3970 if (!Record) 3971 return; 3972 3973 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3974 AbstractUsageInfo Info(*this, Record); 3975 CheckAbstractClassUsage(Info, Record); 3976 } 3977 3978 // If this is not an aggregate type and has no user-declared constructor, 3979 // complain about any non-static data members of reference or const scalar 3980 // type, since they will never get initializers. 3981 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3982 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3983 !Record->isLambda()) { 3984 bool Complained = false; 3985 for (RecordDecl::field_iterator F = Record->field_begin(), 3986 FEnd = Record->field_end(); 3987 F != FEnd; ++F) { 3988 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3989 continue; 3990 3991 if (F->getType()->isReferenceType() || 3992 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3993 if (!Complained) { 3994 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3995 << Record->getTagKind() << Record; 3996 Complained = true; 3997 } 3998 3999 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 4000 << F->getType()->isReferenceType() 4001 << F->getDeclName(); 4002 } 4003 } 4004 } 4005 4006 if (Record->isDynamicClass() && !Record->isDependentType()) 4007 DynamicClasses.push_back(Record); 4008 4009 if (Record->getIdentifier()) { 4010 // C++ [class.mem]p13: 4011 // If T is the name of a class, then each of the following shall have a 4012 // name different from T: 4013 // - every member of every anonymous union that is a member of class T. 4014 // 4015 // C++ [class.mem]p14: 4016 // In addition, if class T has a user-declared constructor (12.1), every 4017 // non-static data member of class T shall have a name different from T. 4018 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4019 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4020 ++I) { 4021 NamedDecl *D = *I; 4022 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4023 isa<IndirectFieldDecl>(D)) { 4024 Diag(D->getLocation(), diag::err_member_name_of_class) 4025 << D->getDeclName(); 4026 break; 4027 } 4028 } 4029 } 4030 4031 // Warn if the class has virtual methods but non-virtual public destructor. 4032 if (Record->isPolymorphic() && !Record->isDependentType()) { 4033 CXXDestructorDecl *dtor = Record->getDestructor(); 4034 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4035 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4036 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4037 } 4038 4039 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4040 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4041 DiagnoseAbstractType(Record); 4042 } 4043 4044 if (!Record->isDependentType()) { 4045 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4046 MEnd = Record->method_end(); 4047 M != MEnd; ++M) { 4048 // See if a method overloads virtual methods in a base 4049 // class without overriding any. 4050 if (!M->isStatic()) 4051 DiagnoseHiddenVirtualMethods(Record, *M); 4052 4053 // Check whether the explicitly-defaulted special members are valid. 4054 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4055 CheckExplicitlyDefaultedSpecialMember(*M); 4056 4057 // For an explicitly defaulted or deleted special member, we defer 4058 // determining triviality until the class is complete. That time is now! 4059 if (!M->isImplicit() && !M->isUserProvided()) { 4060 CXXSpecialMember CSM = getSpecialMember(*M); 4061 if (CSM != CXXInvalid) { 4062 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4063 4064 // Inform the class that we've finished declaring this member. 4065 Record->finishedDefaultedOrDeletedMember(*M); 4066 } 4067 } 4068 } 4069 } 4070 4071 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4072 // function that is not a constructor declares that member function to be 4073 // const. [...] The class of which that function is a member shall be 4074 // a literal type. 4075 // 4076 // If the class has virtual bases, any constexpr members will already have 4077 // been diagnosed by the checks performed on the member declaration, so 4078 // suppress this (less useful) diagnostic. 4079 // 4080 // We delay this until we know whether an explicitly-defaulted (or deleted) 4081 // destructor for the class is trivial. 4082 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4083 !Record->isLiteral() && !Record->getNumVBases()) { 4084 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4085 MEnd = Record->method_end(); 4086 M != MEnd; ++M) { 4087 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4088 switch (Record->getTemplateSpecializationKind()) { 4089 case TSK_ImplicitInstantiation: 4090 case TSK_ExplicitInstantiationDeclaration: 4091 case TSK_ExplicitInstantiationDefinition: 4092 // If a template instantiates to a non-literal type, but its members 4093 // instantiate to constexpr functions, the template is technically 4094 // ill-formed, but we allow it for sanity. 4095 continue; 4096 4097 case TSK_Undeclared: 4098 case TSK_ExplicitSpecialization: 4099 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4100 diag::err_constexpr_method_non_literal); 4101 break; 4102 } 4103 4104 // Only produce one error per class. 4105 break; 4106 } 4107 } 4108 } 4109 4110 // Declare inheriting constructors. We do this eagerly here because: 4111 // - The standard requires an eager diagnostic for conflicting inheriting 4112 // constructors from different classes. 4113 // - The lazy declaration of the other implicit constructors is so as to not 4114 // waste space and performance on classes that are not meant to be 4115 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4116 // have inheriting constructors. 4117 DeclareInheritingConstructors(Record); 4118} 4119 4120/// Is the special member function which would be selected to perform the 4121/// specified operation on the specified class type a constexpr constructor? 4122static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4123 Sema::CXXSpecialMember CSM, 4124 bool ConstArg) { 4125 Sema::SpecialMemberOverloadResult *SMOR = 4126 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4127 false, false, false, false); 4128 if (!SMOR || !SMOR->getMethod()) 4129 // A constructor we wouldn't select can't be "involved in initializing" 4130 // anything. 4131 return true; 4132 return SMOR->getMethod()->isConstexpr(); 4133} 4134 4135/// Determine whether the specified special member function would be constexpr 4136/// if it were implicitly defined. 4137static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4138 Sema::CXXSpecialMember CSM, 4139 bool ConstArg) { 4140 if (!S.getLangOpts().CPlusPlus11) 4141 return false; 4142 4143 // C++11 [dcl.constexpr]p4: 4144 // In the definition of a constexpr constructor [...] 4145 switch (CSM) { 4146 case Sema::CXXDefaultConstructor: 4147 // Since default constructor lookup is essentially trivial (and cannot 4148 // involve, for instance, template instantiation), we compute whether a 4149 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4150 // 4151 // This is important for performance; we need to know whether the default 4152 // constructor is constexpr to determine whether the type is a literal type. 4153 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4154 4155 case Sema::CXXCopyConstructor: 4156 case Sema::CXXMoveConstructor: 4157 // For copy or move constructors, we need to perform overload resolution. 4158 break; 4159 4160 case Sema::CXXCopyAssignment: 4161 case Sema::CXXMoveAssignment: 4162 case Sema::CXXDestructor: 4163 case Sema::CXXInvalid: 4164 return false; 4165 } 4166 4167 // -- if the class is a non-empty union, or for each non-empty anonymous 4168 // union member of a non-union class, exactly one non-static data member 4169 // shall be initialized; [DR1359] 4170 // 4171 // If we squint, this is guaranteed, since exactly one non-static data member 4172 // will be initialized (if the constructor isn't deleted), we just don't know 4173 // which one. 4174 if (ClassDecl->isUnion()) 4175 return true; 4176 4177 // -- the class shall not have any virtual base classes; 4178 if (ClassDecl->getNumVBases()) 4179 return false; 4180 4181 // -- every constructor involved in initializing [...] base class 4182 // sub-objects shall be a constexpr constructor; 4183 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4184 BEnd = ClassDecl->bases_end(); 4185 B != BEnd; ++B) { 4186 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4187 if (!BaseType) continue; 4188 4189 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4190 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4191 return false; 4192 } 4193 4194 // -- every constructor involved in initializing non-static data members 4195 // [...] shall be a constexpr constructor; 4196 // -- every non-static data member and base class sub-object shall be 4197 // initialized 4198 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4199 FEnd = ClassDecl->field_end(); 4200 F != FEnd; ++F) { 4201 if (F->isInvalidDecl()) 4202 continue; 4203 if (const RecordType *RecordTy = 4204 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4205 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4206 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4207 return false; 4208 } 4209 } 4210 4211 // All OK, it's constexpr! 4212 return true; 4213} 4214 4215static Sema::ImplicitExceptionSpecification 4216computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4217 switch (S.getSpecialMember(MD)) { 4218 case Sema::CXXDefaultConstructor: 4219 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4220 case Sema::CXXCopyConstructor: 4221 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4222 case Sema::CXXCopyAssignment: 4223 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4224 case Sema::CXXMoveConstructor: 4225 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4226 case Sema::CXXMoveAssignment: 4227 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4228 case Sema::CXXDestructor: 4229 return S.ComputeDefaultedDtorExceptionSpec(MD); 4230 case Sema::CXXInvalid: 4231 break; 4232 } 4233 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4234 "only special members have implicit exception specs"); 4235 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4236} 4237 4238static void 4239updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4240 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4241 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4242 ExceptSpec.getEPI(EPI); 4243 FD->setType(S.Context.getFunctionType(FPT->getResultType(), 4244 FPT->getArgTypes(), EPI)); 4245} 4246 4247void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4248 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4249 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4250 return; 4251 4252 // Evaluate the exception specification. 4253 ImplicitExceptionSpecification ExceptSpec = 4254 computeImplicitExceptionSpec(*this, Loc, MD); 4255 4256 // Update the type of the special member to use it. 4257 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4258 4259 // A user-provided destructor can be defined outside the class. When that 4260 // happens, be sure to update the exception specification on both 4261 // declarations. 4262 const FunctionProtoType *CanonicalFPT = 4263 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4264 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4265 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4266 CanonicalFPT, ExceptSpec); 4267} 4268 4269void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4270 CXXRecordDecl *RD = MD->getParent(); 4271 CXXSpecialMember CSM = getSpecialMember(MD); 4272 4273 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4274 "not an explicitly-defaulted special member"); 4275 4276 // Whether this was the first-declared instance of the constructor. 4277 // This affects whether we implicitly add an exception spec and constexpr. 4278 bool First = MD == MD->getCanonicalDecl(); 4279 4280 bool HadError = false; 4281 4282 // C++11 [dcl.fct.def.default]p1: 4283 // A function that is explicitly defaulted shall 4284 // -- be a special member function (checked elsewhere), 4285 // -- have the same type (except for ref-qualifiers, and except that a 4286 // copy operation can take a non-const reference) as an implicit 4287 // declaration, and 4288 // -- not have default arguments. 4289 unsigned ExpectedParams = 1; 4290 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4291 ExpectedParams = 0; 4292 if (MD->getNumParams() != ExpectedParams) { 4293 // This also checks for default arguments: a copy or move constructor with a 4294 // default argument is classified as a default constructor, and assignment 4295 // operations and destructors can't have default arguments. 4296 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4297 << CSM << MD->getSourceRange(); 4298 HadError = true; 4299 } else if (MD->isVariadic()) { 4300 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4301 << CSM << MD->getSourceRange(); 4302 HadError = true; 4303 } 4304 4305 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4306 4307 bool CanHaveConstParam = false; 4308 if (CSM == CXXCopyConstructor) 4309 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4310 else if (CSM == CXXCopyAssignment) 4311 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4312 4313 QualType ReturnType = Context.VoidTy; 4314 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4315 // Check for return type matching. 4316 ReturnType = Type->getResultType(); 4317 QualType ExpectedReturnType = 4318 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4319 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4320 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4321 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4322 HadError = true; 4323 } 4324 4325 // A defaulted special member cannot have cv-qualifiers. 4326 if (Type->getTypeQuals()) { 4327 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4328 << (CSM == CXXMoveAssignment); 4329 HadError = true; 4330 } 4331 } 4332 4333 // Check for parameter type matching. 4334 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4335 bool HasConstParam = false; 4336 if (ExpectedParams && ArgType->isReferenceType()) { 4337 // Argument must be reference to possibly-const T. 4338 QualType ReferentType = ArgType->getPointeeType(); 4339 HasConstParam = ReferentType.isConstQualified(); 4340 4341 if (ReferentType.isVolatileQualified()) { 4342 Diag(MD->getLocation(), 4343 diag::err_defaulted_special_member_volatile_param) << CSM; 4344 HadError = true; 4345 } 4346 4347 if (HasConstParam && !CanHaveConstParam) { 4348 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4349 Diag(MD->getLocation(), 4350 diag::err_defaulted_special_member_copy_const_param) 4351 << (CSM == CXXCopyAssignment); 4352 // FIXME: Explain why this special member can't be const. 4353 } else { 4354 Diag(MD->getLocation(), 4355 diag::err_defaulted_special_member_move_const_param) 4356 << (CSM == CXXMoveAssignment); 4357 } 4358 HadError = true; 4359 } 4360 } else if (ExpectedParams) { 4361 // A copy assignment operator can take its argument by value, but a 4362 // defaulted one cannot. 4363 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4364 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4365 HadError = true; 4366 } 4367 4368 // C++11 [dcl.fct.def.default]p2: 4369 // An explicitly-defaulted function may be declared constexpr only if it 4370 // would have been implicitly declared as constexpr, 4371 // Do not apply this rule to members of class templates, since core issue 1358 4372 // makes such functions always instantiate to constexpr functions. For 4373 // non-constructors, this is checked elsewhere. 4374 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4375 HasConstParam); 4376 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4377 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4378 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4379 // FIXME: Explain why the constructor can't be constexpr. 4380 HadError = true; 4381 } 4382 4383 // and may have an explicit exception-specification only if it is compatible 4384 // with the exception-specification on the implicit declaration. 4385 if (Type->hasExceptionSpec()) { 4386 // Delay the check if this is the first declaration of the special member, 4387 // since we may not have parsed some necessary in-class initializers yet. 4388 if (First) { 4389 // If the exception specification needs to be instantiated, do so now, 4390 // before we clobber it with an EST_Unevaluated specification below. 4391 if (Type->getExceptionSpecType() == EST_Uninstantiated) { 4392 InstantiateExceptionSpec(MD->getLocStart(), MD); 4393 Type = MD->getType()->getAs<FunctionProtoType>(); 4394 } 4395 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4396 } else 4397 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4398 } 4399 4400 // If a function is explicitly defaulted on its first declaration, 4401 if (First) { 4402 // -- it is implicitly considered to be constexpr if the implicit 4403 // definition would be, 4404 MD->setConstexpr(Constexpr); 4405 4406 // -- it is implicitly considered to have the same exception-specification 4407 // as if it had been implicitly declared, 4408 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4409 EPI.ExceptionSpecType = EST_Unevaluated; 4410 EPI.ExceptionSpecDecl = MD; 4411 MD->setType(Context.getFunctionType(ReturnType, 4412 ArrayRef<QualType>(&ArgType, 4413 ExpectedParams), 4414 EPI)); 4415 } 4416 4417 if (ShouldDeleteSpecialMember(MD, CSM)) { 4418 if (First) { 4419 SetDeclDeleted(MD, MD->getLocation()); 4420 } else { 4421 // C++11 [dcl.fct.def.default]p4: 4422 // [For a] user-provided explicitly-defaulted function [...] if such a 4423 // function is implicitly defined as deleted, the program is ill-formed. 4424 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4425 HadError = true; 4426 } 4427 } 4428 4429 if (HadError) 4430 MD->setInvalidDecl(); 4431} 4432 4433/// Check whether the exception specification provided for an 4434/// explicitly-defaulted special member matches the exception specification 4435/// that would have been generated for an implicit special member, per 4436/// C++11 [dcl.fct.def.default]p2. 4437void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4438 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4439 // Compute the implicit exception specification. 4440 FunctionProtoType::ExtProtoInfo EPI; 4441 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4442 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4443 Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI)); 4444 4445 // Ensure that it matches. 4446 CheckEquivalentExceptionSpec( 4447 PDiag(diag::err_incorrect_defaulted_exception_spec) 4448 << getSpecialMember(MD), PDiag(), 4449 ImplicitType, SourceLocation(), 4450 SpecifiedType, MD->getLocation()); 4451} 4452 4453void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4454 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4455 I != N; ++I) 4456 CheckExplicitlyDefaultedMemberExceptionSpec( 4457 DelayedDefaultedMemberExceptionSpecs[I].first, 4458 DelayedDefaultedMemberExceptionSpecs[I].second); 4459 4460 DelayedDefaultedMemberExceptionSpecs.clear(); 4461} 4462 4463namespace { 4464struct SpecialMemberDeletionInfo { 4465 Sema &S; 4466 CXXMethodDecl *MD; 4467 Sema::CXXSpecialMember CSM; 4468 bool Diagnose; 4469 4470 // Properties of the special member, computed for convenience. 4471 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4472 SourceLocation Loc; 4473 4474 bool AllFieldsAreConst; 4475 4476 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4477 Sema::CXXSpecialMember CSM, bool Diagnose) 4478 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4479 IsConstructor(false), IsAssignment(false), IsMove(false), 4480 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4481 AllFieldsAreConst(true) { 4482 switch (CSM) { 4483 case Sema::CXXDefaultConstructor: 4484 case Sema::CXXCopyConstructor: 4485 IsConstructor = true; 4486 break; 4487 case Sema::CXXMoveConstructor: 4488 IsConstructor = true; 4489 IsMove = true; 4490 break; 4491 case Sema::CXXCopyAssignment: 4492 IsAssignment = true; 4493 break; 4494 case Sema::CXXMoveAssignment: 4495 IsAssignment = true; 4496 IsMove = true; 4497 break; 4498 case Sema::CXXDestructor: 4499 break; 4500 case Sema::CXXInvalid: 4501 llvm_unreachable("invalid special member kind"); 4502 } 4503 4504 if (MD->getNumParams()) { 4505 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4506 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4507 } 4508 } 4509 4510 bool inUnion() const { return MD->getParent()->isUnion(); } 4511 4512 /// Look up the corresponding special member in the given class. 4513 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4514 unsigned Quals) { 4515 unsigned TQ = MD->getTypeQualifiers(); 4516 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4517 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4518 Quals = 0; 4519 return S.LookupSpecialMember(Class, CSM, 4520 ConstArg || (Quals & Qualifiers::Const), 4521 VolatileArg || (Quals & Qualifiers::Volatile), 4522 MD->getRefQualifier() == RQ_RValue, 4523 TQ & Qualifiers::Const, 4524 TQ & Qualifiers::Volatile); 4525 } 4526 4527 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4528 4529 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4530 bool shouldDeleteForField(FieldDecl *FD); 4531 bool shouldDeleteForAllConstMembers(); 4532 4533 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4534 unsigned Quals); 4535 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4536 Sema::SpecialMemberOverloadResult *SMOR, 4537 bool IsDtorCallInCtor); 4538 4539 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4540}; 4541} 4542 4543/// Is the given special member inaccessible when used on the given 4544/// sub-object. 4545bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4546 CXXMethodDecl *target) { 4547 /// If we're operating on a base class, the object type is the 4548 /// type of this special member. 4549 QualType objectTy; 4550 AccessSpecifier access = target->getAccess(); 4551 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4552 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4553 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4554 4555 // If we're operating on a field, the object type is the type of the field. 4556 } else { 4557 objectTy = S.Context.getTypeDeclType(target->getParent()); 4558 } 4559 4560 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4561} 4562 4563/// Check whether we should delete a special member due to the implicit 4564/// definition containing a call to a special member of a subobject. 4565bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4566 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4567 bool IsDtorCallInCtor) { 4568 CXXMethodDecl *Decl = SMOR->getMethod(); 4569 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4570 4571 int DiagKind = -1; 4572 4573 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4574 DiagKind = !Decl ? 0 : 1; 4575 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4576 DiagKind = 2; 4577 else if (!isAccessible(Subobj, Decl)) 4578 DiagKind = 3; 4579 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4580 !Decl->isTrivial()) { 4581 // A member of a union must have a trivial corresponding special member. 4582 // As a weird special case, a destructor call from a union's constructor 4583 // must be accessible and non-deleted, but need not be trivial. Such a 4584 // destructor is never actually called, but is semantically checked as 4585 // if it were. 4586 DiagKind = 4; 4587 } 4588 4589 if (DiagKind == -1) 4590 return false; 4591 4592 if (Diagnose) { 4593 if (Field) { 4594 S.Diag(Field->getLocation(), 4595 diag::note_deleted_special_member_class_subobject) 4596 << CSM << MD->getParent() << /*IsField*/true 4597 << Field << DiagKind << IsDtorCallInCtor; 4598 } else { 4599 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4600 S.Diag(Base->getLocStart(), 4601 diag::note_deleted_special_member_class_subobject) 4602 << CSM << MD->getParent() << /*IsField*/false 4603 << Base->getType() << DiagKind << IsDtorCallInCtor; 4604 } 4605 4606 if (DiagKind == 1) 4607 S.NoteDeletedFunction(Decl); 4608 // FIXME: Explain inaccessibility if DiagKind == 3. 4609 } 4610 4611 return true; 4612} 4613 4614/// Check whether we should delete a special member function due to having a 4615/// direct or virtual base class or non-static data member of class type M. 4616bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4617 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4618 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4619 4620 // C++11 [class.ctor]p5: 4621 // -- any direct or virtual base class, or non-static data member with no 4622 // brace-or-equal-initializer, has class type M (or array thereof) and 4623 // either M has no default constructor or overload resolution as applied 4624 // to M's default constructor results in an ambiguity or in a function 4625 // that is deleted or inaccessible 4626 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4627 // -- a direct or virtual base class B that cannot be copied/moved because 4628 // overload resolution, as applied to B's corresponding special member, 4629 // results in an ambiguity or a function that is deleted or inaccessible 4630 // from the defaulted special member 4631 // C++11 [class.dtor]p5: 4632 // -- any direct or virtual base class [...] has a type with a destructor 4633 // that is deleted or inaccessible 4634 if (!(CSM == Sema::CXXDefaultConstructor && 4635 Field && Field->hasInClassInitializer()) && 4636 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4637 return true; 4638 4639 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4640 // -- any direct or virtual base class or non-static data member has a 4641 // type with a destructor that is deleted or inaccessible 4642 if (IsConstructor) { 4643 Sema::SpecialMemberOverloadResult *SMOR = 4644 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4645 false, false, false, false, false); 4646 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4647 return true; 4648 } 4649 4650 return false; 4651} 4652 4653/// Check whether we should delete a special member function due to the class 4654/// having a particular direct or virtual base class. 4655bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4656 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4657 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4658} 4659 4660/// Check whether we should delete a special member function due to the class 4661/// having a particular non-static data member. 4662bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4663 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4664 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4665 4666 if (CSM == Sema::CXXDefaultConstructor) { 4667 // For a default constructor, all references must be initialized in-class 4668 // and, if a union, it must have a non-const member. 4669 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4670 if (Diagnose) 4671 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4672 << MD->getParent() << FD << FieldType << /*Reference*/0; 4673 return true; 4674 } 4675 // C++11 [class.ctor]p5: any non-variant non-static data member of 4676 // const-qualified type (or array thereof) with no 4677 // brace-or-equal-initializer does not have a user-provided default 4678 // constructor. 4679 if (!inUnion() && FieldType.isConstQualified() && 4680 !FD->hasInClassInitializer() && 4681 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4682 if (Diagnose) 4683 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4684 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4685 return true; 4686 } 4687 4688 if (inUnion() && !FieldType.isConstQualified()) 4689 AllFieldsAreConst = false; 4690 } else if (CSM == Sema::CXXCopyConstructor) { 4691 // For a copy constructor, data members must not be of rvalue reference 4692 // type. 4693 if (FieldType->isRValueReferenceType()) { 4694 if (Diagnose) 4695 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4696 << MD->getParent() << FD << FieldType; 4697 return true; 4698 } 4699 } else if (IsAssignment) { 4700 // For an assignment operator, data members must not be of reference type. 4701 if (FieldType->isReferenceType()) { 4702 if (Diagnose) 4703 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4704 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4705 return true; 4706 } 4707 if (!FieldRecord && FieldType.isConstQualified()) { 4708 // C++11 [class.copy]p23: 4709 // -- a non-static data member of const non-class type (or array thereof) 4710 if (Diagnose) 4711 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4712 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4713 return true; 4714 } 4715 } 4716 4717 if (FieldRecord) { 4718 // Some additional restrictions exist on the variant members. 4719 if (!inUnion() && FieldRecord->isUnion() && 4720 FieldRecord->isAnonymousStructOrUnion()) { 4721 bool AllVariantFieldsAreConst = true; 4722 4723 // FIXME: Handle anonymous unions declared within anonymous unions. 4724 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4725 UE = FieldRecord->field_end(); 4726 UI != UE; ++UI) { 4727 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4728 4729 if (!UnionFieldType.isConstQualified()) 4730 AllVariantFieldsAreConst = false; 4731 4732 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4733 if (UnionFieldRecord && 4734 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4735 UnionFieldType.getCVRQualifiers())) 4736 return true; 4737 } 4738 4739 // At least one member in each anonymous union must be non-const 4740 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4741 FieldRecord->field_begin() != FieldRecord->field_end()) { 4742 if (Diagnose) 4743 S.Diag(FieldRecord->getLocation(), 4744 diag::note_deleted_default_ctor_all_const) 4745 << MD->getParent() << /*anonymous union*/1; 4746 return true; 4747 } 4748 4749 // Don't check the implicit member of the anonymous union type. 4750 // This is technically non-conformant, but sanity demands it. 4751 return false; 4752 } 4753 4754 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4755 FieldType.getCVRQualifiers())) 4756 return true; 4757 } 4758 4759 return false; 4760} 4761 4762/// C++11 [class.ctor] p5: 4763/// A defaulted default constructor for a class X is defined as deleted if 4764/// X is a union and all of its variant members are of const-qualified type. 4765bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4766 // This is a silly definition, because it gives an empty union a deleted 4767 // default constructor. Don't do that. 4768 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4769 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4770 if (Diagnose) 4771 S.Diag(MD->getParent()->getLocation(), 4772 diag::note_deleted_default_ctor_all_const) 4773 << MD->getParent() << /*not anonymous union*/0; 4774 return true; 4775 } 4776 return false; 4777} 4778 4779/// Determine whether a defaulted special member function should be defined as 4780/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4781/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4782bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4783 bool Diagnose) { 4784 if (MD->isInvalidDecl()) 4785 return false; 4786 CXXRecordDecl *RD = MD->getParent(); 4787 assert(!RD->isDependentType() && "do deletion after instantiation"); 4788 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4789 return false; 4790 4791 // C++11 [expr.lambda.prim]p19: 4792 // The closure type associated with a lambda-expression has a 4793 // deleted (8.4.3) default constructor and a deleted copy 4794 // assignment operator. 4795 if (RD->isLambda() && 4796 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4797 if (Diagnose) 4798 Diag(RD->getLocation(), diag::note_lambda_decl); 4799 return true; 4800 } 4801 4802 // For an anonymous struct or union, the copy and assignment special members 4803 // will never be used, so skip the check. For an anonymous union declared at 4804 // namespace scope, the constructor and destructor are used. 4805 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4806 RD->isAnonymousStructOrUnion()) 4807 return false; 4808 4809 // C++11 [class.copy]p7, p18: 4810 // If the class definition declares a move constructor or move assignment 4811 // operator, an implicitly declared copy constructor or copy assignment 4812 // operator is defined as deleted. 4813 if (MD->isImplicit() && 4814 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4815 CXXMethodDecl *UserDeclaredMove = 0; 4816 4817 // In Microsoft mode, a user-declared move only causes the deletion of the 4818 // corresponding copy operation, not both copy operations. 4819 if (RD->hasUserDeclaredMoveConstructor() && 4820 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4821 if (!Diagnose) return true; 4822 4823 // Find any user-declared move constructor. 4824 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4825 E = RD->ctor_end(); I != E; ++I) { 4826 if (I->isMoveConstructor()) { 4827 UserDeclaredMove = *I; 4828 break; 4829 } 4830 } 4831 assert(UserDeclaredMove); 4832 } else if (RD->hasUserDeclaredMoveAssignment() && 4833 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4834 if (!Diagnose) return true; 4835 4836 // Find any user-declared move assignment operator. 4837 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4838 E = RD->method_end(); I != E; ++I) { 4839 if (I->isMoveAssignmentOperator()) { 4840 UserDeclaredMove = *I; 4841 break; 4842 } 4843 } 4844 assert(UserDeclaredMove); 4845 } 4846 4847 if (UserDeclaredMove) { 4848 Diag(UserDeclaredMove->getLocation(), 4849 diag::note_deleted_copy_user_declared_move) 4850 << (CSM == CXXCopyAssignment) << RD 4851 << UserDeclaredMove->isMoveAssignmentOperator(); 4852 return true; 4853 } 4854 } 4855 4856 // Do access control from the special member function 4857 ContextRAII MethodContext(*this, MD); 4858 4859 // C++11 [class.dtor]p5: 4860 // -- for a virtual destructor, lookup of the non-array deallocation function 4861 // results in an ambiguity or in a function that is deleted or inaccessible 4862 if (CSM == CXXDestructor && MD->isVirtual()) { 4863 FunctionDecl *OperatorDelete = 0; 4864 DeclarationName Name = 4865 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4866 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4867 OperatorDelete, false)) { 4868 if (Diagnose) 4869 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4870 return true; 4871 } 4872 } 4873 4874 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4875 4876 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4877 BE = RD->bases_end(); BI != BE; ++BI) 4878 if (!BI->isVirtual() && 4879 SMI.shouldDeleteForBase(BI)) 4880 return true; 4881 4882 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4883 BE = RD->vbases_end(); BI != BE; ++BI) 4884 if (SMI.shouldDeleteForBase(BI)) 4885 return true; 4886 4887 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4888 FE = RD->field_end(); FI != FE; ++FI) 4889 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4890 SMI.shouldDeleteForField(*FI)) 4891 return true; 4892 4893 if (SMI.shouldDeleteForAllConstMembers()) 4894 return true; 4895 4896 return false; 4897} 4898 4899/// Perform lookup for a special member of the specified kind, and determine 4900/// whether it is trivial. If the triviality can be determined without the 4901/// lookup, skip it. This is intended for use when determining whether a 4902/// special member of a containing object is trivial, and thus does not ever 4903/// perform overload resolution for default constructors. 4904/// 4905/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 4906/// member that was most likely to be intended to be trivial, if any. 4907static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 4908 Sema::CXXSpecialMember CSM, unsigned Quals, 4909 CXXMethodDecl **Selected) { 4910 if (Selected) 4911 *Selected = 0; 4912 4913 switch (CSM) { 4914 case Sema::CXXInvalid: 4915 llvm_unreachable("not a special member"); 4916 4917 case Sema::CXXDefaultConstructor: 4918 // C++11 [class.ctor]p5: 4919 // A default constructor is trivial if: 4920 // - all the [direct subobjects] have trivial default constructors 4921 // 4922 // Note, no overload resolution is performed in this case. 4923 if (RD->hasTrivialDefaultConstructor()) 4924 return true; 4925 4926 if (Selected) { 4927 // If there's a default constructor which could have been trivial, dig it 4928 // out. Otherwise, if there's any user-provided default constructor, point 4929 // to that as an example of why there's not a trivial one. 4930 CXXConstructorDecl *DefCtor = 0; 4931 if (RD->needsImplicitDefaultConstructor()) 4932 S.DeclareImplicitDefaultConstructor(RD); 4933 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 4934 CE = RD->ctor_end(); CI != CE; ++CI) { 4935 if (!CI->isDefaultConstructor()) 4936 continue; 4937 DefCtor = *CI; 4938 if (!DefCtor->isUserProvided()) 4939 break; 4940 } 4941 4942 *Selected = DefCtor; 4943 } 4944 4945 return false; 4946 4947 case Sema::CXXDestructor: 4948 // C++11 [class.dtor]p5: 4949 // A destructor is trivial if: 4950 // - all the direct [subobjects] have trivial destructors 4951 if (RD->hasTrivialDestructor()) 4952 return true; 4953 4954 if (Selected) { 4955 if (RD->needsImplicitDestructor()) 4956 S.DeclareImplicitDestructor(RD); 4957 *Selected = RD->getDestructor(); 4958 } 4959 4960 return false; 4961 4962 case Sema::CXXCopyConstructor: 4963 // C++11 [class.copy]p12: 4964 // A copy constructor is trivial if: 4965 // - the constructor selected to copy each direct [subobject] is trivial 4966 if (RD->hasTrivialCopyConstructor()) { 4967 if (Quals == Qualifiers::Const) 4968 // We must either select the trivial copy constructor or reach an 4969 // ambiguity; no need to actually perform overload resolution. 4970 return true; 4971 } else if (!Selected) { 4972 return false; 4973 } 4974 // In C++98, we are not supposed to perform overload resolution here, but we 4975 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 4976 // cases like B as having a non-trivial copy constructor: 4977 // struct A { template<typename T> A(T&); }; 4978 // struct B { mutable A a; }; 4979 goto NeedOverloadResolution; 4980 4981 case Sema::CXXCopyAssignment: 4982 // C++11 [class.copy]p25: 4983 // A copy assignment operator is trivial if: 4984 // - the assignment operator selected to copy each direct [subobject] is 4985 // trivial 4986 if (RD->hasTrivialCopyAssignment()) { 4987 if (Quals == Qualifiers::Const) 4988 return true; 4989 } else if (!Selected) { 4990 return false; 4991 } 4992 // In C++98, we are not supposed to perform overload resolution here, but we 4993 // treat that as a language defect. 4994 goto NeedOverloadResolution; 4995 4996 case Sema::CXXMoveConstructor: 4997 case Sema::CXXMoveAssignment: 4998 NeedOverloadResolution: 4999 Sema::SpecialMemberOverloadResult *SMOR = 5000 S.LookupSpecialMember(RD, CSM, 5001 Quals & Qualifiers::Const, 5002 Quals & Qualifiers::Volatile, 5003 /*RValueThis*/false, /*ConstThis*/false, 5004 /*VolatileThis*/false); 5005 5006 // The standard doesn't describe how to behave if the lookup is ambiguous. 5007 // We treat it as not making the member non-trivial, just like the standard 5008 // mandates for the default constructor. This should rarely matter, because 5009 // the member will also be deleted. 5010 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 5011 return true; 5012 5013 if (!SMOR->getMethod()) { 5014 assert(SMOR->getKind() == 5015 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 5016 return false; 5017 } 5018 5019 // We deliberately don't check if we found a deleted special member. We're 5020 // not supposed to! 5021 if (Selected) 5022 *Selected = SMOR->getMethod(); 5023 return SMOR->getMethod()->isTrivial(); 5024 } 5025 5026 llvm_unreachable("unknown special method kind"); 5027} 5028 5029static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5030 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5031 CI != CE; ++CI) 5032 if (!CI->isImplicit()) 5033 return *CI; 5034 5035 // Look for constructor templates. 5036 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5037 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5038 if (CXXConstructorDecl *CD = 5039 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5040 return CD; 5041 } 5042 5043 return 0; 5044} 5045 5046/// The kind of subobject we are checking for triviality. The values of this 5047/// enumeration are used in diagnostics. 5048enum TrivialSubobjectKind { 5049 /// The subobject is a base class. 5050 TSK_BaseClass, 5051 /// The subobject is a non-static data member. 5052 TSK_Field, 5053 /// The object is actually the complete object. 5054 TSK_CompleteObject 5055}; 5056 5057/// Check whether the special member selected for a given type would be trivial. 5058static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5059 QualType SubType, 5060 Sema::CXXSpecialMember CSM, 5061 TrivialSubobjectKind Kind, 5062 bool Diagnose) { 5063 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5064 if (!SubRD) 5065 return true; 5066 5067 CXXMethodDecl *Selected; 5068 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5069 Diagnose ? &Selected : 0)) 5070 return true; 5071 5072 if (Diagnose) { 5073 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5074 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5075 << Kind << SubType.getUnqualifiedType(); 5076 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5077 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5078 } else if (!Selected) 5079 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5080 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5081 else if (Selected->isUserProvided()) { 5082 if (Kind == TSK_CompleteObject) 5083 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5084 << Kind << SubType.getUnqualifiedType() << CSM; 5085 else { 5086 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5087 << Kind << SubType.getUnqualifiedType() << CSM; 5088 S.Diag(Selected->getLocation(), diag::note_declared_at); 5089 } 5090 } else { 5091 if (Kind != TSK_CompleteObject) 5092 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5093 << Kind << SubType.getUnqualifiedType() << CSM; 5094 5095 // Explain why the defaulted or deleted special member isn't trivial. 5096 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5097 } 5098 } 5099 5100 return false; 5101} 5102 5103/// Check whether the members of a class type allow a special member to be 5104/// trivial. 5105static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5106 Sema::CXXSpecialMember CSM, 5107 bool ConstArg, bool Diagnose) { 5108 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5109 FE = RD->field_end(); FI != FE; ++FI) { 5110 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5111 continue; 5112 5113 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5114 5115 // Pretend anonymous struct or union members are members of this class. 5116 if (FI->isAnonymousStructOrUnion()) { 5117 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5118 CSM, ConstArg, Diagnose)) 5119 return false; 5120 continue; 5121 } 5122 5123 // C++11 [class.ctor]p5: 5124 // A default constructor is trivial if [...] 5125 // -- no non-static data member of its class has a 5126 // brace-or-equal-initializer 5127 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5128 if (Diagnose) 5129 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5130 return false; 5131 } 5132 5133 // Objective C ARC 4.3.5: 5134 // [...] nontrivally ownership-qualified types are [...] not trivially 5135 // default constructible, copy constructible, move constructible, copy 5136 // assignable, move assignable, or destructible [...] 5137 if (S.getLangOpts().ObjCAutoRefCount && 5138 FieldType.hasNonTrivialObjCLifetime()) { 5139 if (Diagnose) 5140 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5141 << RD << FieldType.getObjCLifetime(); 5142 return false; 5143 } 5144 5145 if (ConstArg && !FI->isMutable()) 5146 FieldType.addConst(); 5147 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5148 TSK_Field, Diagnose)) 5149 return false; 5150 } 5151 5152 return true; 5153} 5154 5155/// Diagnose why the specified class does not have a trivial special member of 5156/// the given kind. 5157void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5158 QualType Ty = Context.getRecordType(RD); 5159 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5160 Ty.addConst(); 5161 5162 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5163 TSK_CompleteObject, /*Diagnose*/true); 5164} 5165 5166/// Determine whether a defaulted or deleted special member function is trivial, 5167/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5168/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5169bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5170 bool Diagnose) { 5171 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5172 5173 CXXRecordDecl *RD = MD->getParent(); 5174 5175 bool ConstArg = false; 5176 5177 // C++11 [class.copy]p12, p25: 5178 // A [special member] is trivial if its declared parameter type is the same 5179 // as if it had been implicitly declared [...] 5180 switch (CSM) { 5181 case CXXDefaultConstructor: 5182 case CXXDestructor: 5183 // Trivial default constructors and destructors cannot have parameters. 5184 break; 5185 5186 case CXXCopyConstructor: 5187 case CXXCopyAssignment: { 5188 // Trivial copy operations always have const, non-volatile parameter types. 5189 ConstArg = true; 5190 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5191 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5192 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5193 if (Diagnose) 5194 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5195 << Param0->getSourceRange() << Param0->getType() 5196 << Context.getLValueReferenceType( 5197 Context.getRecordType(RD).withConst()); 5198 return false; 5199 } 5200 break; 5201 } 5202 5203 case CXXMoveConstructor: 5204 case CXXMoveAssignment: { 5205 // Trivial move operations always have non-cv-qualified parameters. 5206 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5207 const RValueReferenceType *RT = 5208 Param0->getType()->getAs<RValueReferenceType>(); 5209 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5210 if (Diagnose) 5211 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5212 << Param0->getSourceRange() << Param0->getType() 5213 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5214 return false; 5215 } 5216 break; 5217 } 5218 5219 case CXXInvalid: 5220 llvm_unreachable("not a special member"); 5221 } 5222 5223 // FIXME: We require that the parameter-declaration-clause is equivalent to 5224 // that of an implicit declaration, not just that the declared parameter type 5225 // matches, in order to prevent absuridities like a function simultaneously 5226 // being a trivial copy constructor and a non-trivial default constructor. 5227 // This issue has not yet been assigned a core issue number. 5228 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5229 if (Diagnose) 5230 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5231 diag::note_nontrivial_default_arg) 5232 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5233 return false; 5234 } 5235 if (MD->isVariadic()) { 5236 if (Diagnose) 5237 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5238 return false; 5239 } 5240 5241 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5242 // A copy/move [constructor or assignment operator] is trivial if 5243 // -- the [member] selected to copy/move each direct base class subobject 5244 // is trivial 5245 // 5246 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5247 // A [default constructor or destructor] is trivial if 5248 // -- all the direct base classes have trivial [default constructors or 5249 // destructors] 5250 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5251 BE = RD->bases_end(); BI != BE; ++BI) 5252 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5253 ConstArg ? BI->getType().withConst() 5254 : BI->getType(), 5255 CSM, TSK_BaseClass, Diagnose)) 5256 return false; 5257 5258 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5259 // A copy/move [constructor or assignment operator] for a class X is 5260 // trivial if 5261 // -- for each non-static data member of X that is of class type (or array 5262 // thereof), the constructor selected to copy/move that member is 5263 // trivial 5264 // 5265 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5266 // A [default constructor or destructor] is trivial if 5267 // -- for all of the non-static data members of its class that are of class 5268 // type (or array thereof), each such class has a trivial [default 5269 // constructor or destructor] 5270 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5271 return false; 5272 5273 // C++11 [class.dtor]p5: 5274 // A destructor is trivial if [...] 5275 // -- the destructor is not virtual 5276 if (CSM == CXXDestructor && MD->isVirtual()) { 5277 if (Diagnose) 5278 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5279 return false; 5280 } 5281 5282 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5283 // A [special member] for class X is trivial if [...] 5284 // -- class X has no virtual functions and no virtual base classes 5285 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5286 if (!Diagnose) 5287 return false; 5288 5289 if (RD->getNumVBases()) { 5290 // Check for virtual bases. We already know that the corresponding 5291 // member in all bases is trivial, so vbases must all be direct. 5292 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5293 assert(BS.isVirtual()); 5294 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5295 return false; 5296 } 5297 5298 // Must have a virtual method. 5299 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5300 ME = RD->method_end(); MI != ME; ++MI) { 5301 if (MI->isVirtual()) { 5302 SourceLocation MLoc = MI->getLocStart(); 5303 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5304 return false; 5305 } 5306 } 5307 5308 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5309 } 5310 5311 // Looks like it's trivial! 5312 return true; 5313} 5314 5315/// \brief Data used with FindHiddenVirtualMethod 5316namespace { 5317 struct FindHiddenVirtualMethodData { 5318 Sema *S; 5319 CXXMethodDecl *Method; 5320 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5321 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5322 }; 5323} 5324 5325/// \brief Check whether any most overriden method from MD in Methods 5326static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5327 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5328 if (MD->size_overridden_methods() == 0) 5329 return Methods.count(MD->getCanonicalDecl()); 5330 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5331 E = MD->end_overridden_methods(); 5332 I != E; ++I) 5333 if (CheckMostOverridenMethods(*I, Methods)) 5334 return true; 5335 return false; 5336} 5337 5338/// \brief Member lookup function that determines whether a given C++ 5339/// method overloads virtual methods in a base class without overriding any, 5340/// to be used with CXXRecordDecl::lookupInBases(). 5341static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5342 CXXBasePath &Path, 5343 void *UserData) { 5344 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5345 5346 FindHiddenVirtualMethodData &Data 5347 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5348 5349 DeclarationName Name = Data.Method->getDeclName(); 5350 assert(Name.getNameKind() == DeclarationName::Identifier); 5351 5352 bool foundSameNameMethod = false; 5353 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5354 for (Path.Decls = BaseRecord->lookup(Name); 5355 !Path.Decls.empty(); 5356 Path.Decls = Path.Decls.slice(1)) { 5357 NamedDecl *D = Path.Decls.front(); 5358 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5359 MD = MD->getCanonicalDecl(); 5360 foundSameNameMethod = true; 5361 // Interested only in hidden virtual methods. 5362 if (!MD->isVirtual()) 5363 continue; 5364 // If the method we are checking overrides a method from its base 5365 // don't warn about the other overloaded methods. 5366 if (!Data.S->IsOverload(Data.Method, MD, false)) 5367 return true; 5368 // Collect the overload only if its hidden. 5369 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5370 overloadedMethods.push_back(MD); 5371 } 5372 } 5373 5374 if (foundSameNameMethod) 5375 Data.OverloadedMethods.append(overloadedMethods.begin(), 5376 overloadedMethods.end()); 5377 return foundSameNameMethod; 5378} 5379 5380/// \brief Add the most overriden methods from MD to Methods 5381static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5382 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5383 if (MD->size_overridden_methods() == 0) 5384 Methods.insert(MD->getCanonicalDecl()); 5385 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5386 E = MD->end_overridden_methods(); 5387 I != E; ++I) 5388 AddMostOverridenMethods(*I, Methods); 5389} 5390 5391/// \brief See if a method overloads virtual methods in a base class without 5392/// overriding any. 5393void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5394 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5395 MD->getLocation()) == DiagnosticsEngine::Ignored) 5396 return; 5397 if (!MD->getDeclName().isIdentifier()) 5398 return; 5399 5400 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5401 /*bool RecordPaths=*/false, 5402 /*bool DetectVirtual=*/false); 5403 FindHiddenVirtualMethodData Data; 5404 Data.Method = MD; 5405 Data.S = this; 5406 5407 // Keep the base methods that were overriden or introduced in the subclass 5408 // by 'using' in a set. A base method not in this set is hidden. 5409 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5410 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5411 NamedDecl *ND = *I; 5412 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5413 ND = shad->getTargetDecl(); 5414 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5415 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5416 } 5417 5418 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5419 !Data.OverloadedMethods.empty()) { 5420 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5421 << MD << (Data.OverloadedMethods.size() > 1); 5422 5423 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5424 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5425 PartialDiagnostic PD = PDiag( 5426 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5427 HandleFunctionTypeMismatch(PD, MD->getType(), overloadedMD->getType()); 5428 Diag(overloadedMD->getLocation(), PD); 5429 } 5430 } 5431} 5432 5433void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5434 Decl *TagDecl, 5435 SourceLocation LBrac, 5436 SourceLocation RBrac, 5437 AttributeList *AttrList) { 5438 if (!TagDecl) 5439 return; 5440 5441 AdjustDeclIfTemplate(TagDecl); 5442 5443 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5444 if (l->getKind() != AttributeList::AT_Visibility) 5445 continue; 5446 l->setInvalid(); 5447 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5448 l->getName(); 5449 } 5450 5451 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5452 // strict aliasing violation! 5453 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5454 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5455 5456 CheckCompletedCXXClass( 5457 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5458} 5459 5460/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5461/// special functions, such as the default constructor, copy 5462/// constructor, or destructor, to the given C++ class (C++ 5463/// [special]p1). This routine can only be executed just before the 5464/// definition of the class is complete. 5465void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5466 if (!ClassDecl->hasUserDeclaredConstructor()) 5467 ++ASTContext::NumImplicitDefaultConstructors; 5468 5469 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5470 ++ASTContext::NumImplicitCopyConstructors; 5471 5472 // If the properties or semantics of the copy constructor couldn't be 5473 // determined while the class was being declared, force a declaration 5474 // of it now. 5475 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5476 DeclareImplicitCopyConstructor(ClassDecl); 5477 } 5478 5479 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5480 ++ASTContext::NumImplicitMoveConstructors; 5481 5482 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5483 DeclareImplicitMoveConstructor(ClassDecl); 5484 } 5485 5486 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5487 ++ASTContext::NumImplicitCopyAssignmentOperators; 5488 5489 // If we have a dynamic class, then the copy assignment operator may be 5490 // virtual, so we have to declare it immediately. This ensures that, e.g., 5491 // it shows up in the right place in the vtable and that we diagnose 5492 // problems with the implicit exception specification. 5493 if (ClassDecl->isDynamicClass() || 5494 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5495 DeclareImplicitCopyAssignment(ClassDecl); 5496 } 5497 5498 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5499 ++ASTContext::NumImplicitMoveAssignmentOperators; 5500 5501 // Likewise for the move assignment operator. 5502 if (ClassDecl->isDynamicClass() || 5503 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5504 DeclareImplicitMoveAssignment(ClassDecl); 5505 } 5506 5507 if (!ClassDecl->hasUserDeclaredDestructor()) { 5508 ++ASTContext::NumImplicitDestructors; 5509 5510 // If we have a dynamic class, then the destructor may be virtual, so we 5511 // have to declare the destructor immediately. This ensures that, e.g., it 5512 // shows up in the right place in the vtable and that we diagnose problems 5513 // with the implicit exception specification. 5514 if (ClassDecl->isDynamicClass() || 5515 ClassDecl->needsOverloadResolutionForDestructor()) 5516 DeclareImplicitDestructor(ClassDecl); 5517 } 5518} 5519 5520void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5521 if (!D) 5522 return; 5523 5524 int NumParamList = D->getNumTemplateParameterLists(); 5525 for (int i = 0; i < NumParamList; i++) { 5526 TemplateParameterList* Params = D->getTemplateParameterList(i); 5527 for (TemplateParameterList::iterator Param = Params->begin(), 5528 ParamEnd = Params->end(); 5529 Param != ParamEnd; ++Param) { 5530 NamedDecl *Named = cast<NamedDecl>(*Param); 5531 if (Named->getDeclName()) { 5532 S->AddDecl(Named); 5533 IdResolver.AddDecl(Named); 5534 } 5535 } 5536 } 5537} 5538 5539void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5540 if (!D) 5541 return; 5542 5543 TemplateParameterList *Params = 0; 5544 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5545 Params = Template->getTemplateParameters(); 5546 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5547 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5548 Params = PartialSpec->getTemplateParameters(); 5549 else 5550 return; 5551 5552 for (TemplateParameterList::iterator Param = Params->begin(), 5553 ParamEnd = Params->end(); 5554 Param != ParamEnd; ++Param) { 5555 NamedDecl *Named = cast<NamedDecl>(*Param); 5556 if (Named->getDeclName()) { 5557 S->AddDecl(Named); 5558 IdResolver.AddDecl(Named); 5559 } 5560 } 5561} 5562 5563void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5564 if (!RecordD) return; 5565 AdjustDeclIfTemplate(RecordD); 5566 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5567 PushDeclContext(S, Record); 5568} 5569 5570void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5571 if (!RecordD) return; 5572 PopDeclContext(); 5573} 5574 5575/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5576/// parsing a top-level (non-nested) C++ class, and we are now 5577/// parsing those parts of the given Method declaration that could 5578/// not be parsed earlier (C++ [class.mem]p2), such as default 5579/// arguments. This action should enter the scope of the given 5580/// Method declaration as if we had just parsed the qualified method 5581/// name. However, it should not bring the parameters into scope; 5582/// that will be performed by ActOnDelayedCXXMethodParameter. 5583void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5584} 5585 5586/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5587/// C++ method declaration. We're (re-)introducing the given 5588/// function parameter into scope for use in parsing later parts of 5589/// the method declaration. For example, we could see an 5590/// ActOnParamDefaultArgument event for this parameter. 5591void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5592 if (!ParamD) 5593 return; 5594 5595 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5596 5597 // If this parameter has an unparsed default argument, clear it out 5598 // to make way for the parsed default argument. 5599 if (Param->hasUnparsedDefaultArg()) 5600 Param->setDefaultArg(0); 5601 5602 S->AddDecl(Param); 5603 if (Param->getDeclName()) 5604 IdResolver.AddDecl(Param); 5605} 5606 5607/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5608/// processing the delayed method declaration for Method. The method 5609/// declaration is now considered finished. There may be a separate 5610/// ActOnStartOfFunctionDef action later (not necessarily 5611/// immediately!) for this method, if it was also defined inside the 5612/// class body. 5613void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5614 if (!MethodD) 5615 return; 5616 5617 AdjustDeclIfTemplate(MethodD); 5618 5619 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5620 5621 // Now that we have our default arguments, check the constructor 5622 // again. It could produce additional diagnostics or affect whether 5623 // the class has implicitly-declared destructors, among other 5624 // things. 5625 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5626 CheckConstructor(Constructor); 5627 5628 // Check the default arguments, which we may have added. 5629 if (!Method->isInvalidDecl()) 5630 CheckCXXDefaultArguments(Method); 5631} 5632 5633/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5634/// the well-formedness of the constructor declarator @p D with type @p 5635/// R. If there are any errors in the declarator, this routine will 5636/// emit diagnostics and set the invalid bit to true. In any case, the type 5637/// will be updated to reflect a well-formed type for the constructor and 5638/// returned. 5639QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5640 StorageClass &SC) { 5641 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5642 5643 // C++ [class.ctor]p3: 5644 // A constructor shall not be virtual (10.3) or static (9.4). A 5645 // constructor can be invoked for a const, volatile or const 5646 // volatile object. A constructor shall not be declared const, 5647 // volatile, or const volatile (9.3.2). 5648 if (isVirtual) { 5649 if (!D.isInvalidType()) 5650 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5651 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5652 << SourceRange(D.getIdentifierLoc()); 5653 D.setInvalidType(); 5654 } 5655 if (SC == SC_Static) { 5656 if (!D.isInvalidType()) 5657 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5658 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5659 << SourceRange(D.getIdentifierLoc()); 5660 D.setInvalidType(); 5661 SC = SC_None; 5662 } 5663 5664 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5665 if (FTI.TypeQuals != 0) { 5666 if (FTI.TypeQuals & Qualifiers::Const) 5667 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5668 << "const" << SourceRange(D.getIdentifierLoc()); 5669 if (FTI.TypeQuals & Qualifiers::Volatile) 5670 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5671 << "volatile" << SourceRange(D.getIdentifierLoc()); 5672 if (FTI.TypeQuals & Qualifiers::Restrict) 5673 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5674 << "restrict" << SourceRange(D.getIdentifierLoc()); 5675 D.setInvalidType(); 5676 } 5677 5678 // C++0x [class.ctor]p4: 5679 // A constructor shall not be declared with a ref-qualifier. 5680 if (FTI.hasRefQualifier()) { 5681 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5682 << FTI.RefQualifierIsLValueRef 5683 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5684 D.setInvalidType(); 5685 } 5686 5687 // Rebuild the function type "R" without any type qualifiers (in 5688 // case any of the errors above fired) and with "void" as the 5689 // return type, since constructors don't have return types. 5690 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5691 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5692 return R; 5693 5694 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5695 EPI.TypeQuals = 0; 5696 EPI.RefQualifier = RQ_None; 5697 5698 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5699} 5700 5701/// CheckConstructor - Checks a fully-formed constructor for 5702/// well-formedness, issuing any diagnostics required. Returns true if 5703/// the constructor declarator is invalid. 5704void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5705 CXXRecordDecl *ClassDecl 5706 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5707 if (!ClassDecl) 5708 return Constructor->setInvalidDecl(); 5709 5710 // C++ [class.copy]p3: 5711 // A declaration of a constructor for a class X is ill-formed if 5712 // its first parameter is of type (optionally cv-qualified) X and 5713 // either there are no other parameters or else all other 5714 // parameters have default arguments. 5715 if (!Constructor->isInvalidDecl() && 5716 ((Constructor->getNumParams() == 1) || 5717 (Constructor->getNumParams() > 1 && 5718 Constructor->getParamDecl(1)->hasDefaultArg())) && 5719 Constructor->getTemplateSpecializationKind() 5720 != TSK_ImplicitInstantiation) { 5721 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5722 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5723 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5724 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5725 const char *ConstRef 5726 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5727 : " const &"; 5728 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5729 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5730 5731 // FIXME: Rather that making the constructor invalid, we should endeavor 5732 // to fix the type. 5733 Constructor->setInvalidDecl(); 5734 } 5735 } 5736} 5737 5738/// CheckDestructor - Checks a fully-formed destructor definition for 5739/// well-formedness, issuing any diagnostics required. Returns true 5740/// on error. 5741bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5742 CXXRecordDecl *RD = Destructor->getParent(); 5743 5744 if (Destructor->isVirtual()) { 5745 SourceLocation Loc; 5746 5747 if (!Destructor->isImplicit()) 5748 Loc = Destructor->getLocation(); 5749 else 5750 Loc = RD->getLocation(); 5751 5752 // If we have a virtual destructor, look up the deallocation function 5753 FunctionDecl *OperatorDelete = 0; 5754 DeclarationName Name = 5755 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5756 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5757 return true; 5758 5759 MarkFunctionReferenced(Loc, OperatorDelete); 5760 5761 Destructor->setOperatorDelete(OperatorDelete); 5762 } 5763 5764 return false; 5765} 5766 5767static inline bool 5768FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5769 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5770 FTI.ArgInfo[0].Param && 5771 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5772} 5773 5774/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5775/// the well-formednes of the destructor declarator @p D with type @p 5776/// R. If there are any errors in the declarator, this routine will 5777/// emit diagnostics and set the declarator to invalid. Even if this happens, 5778/// will be updated to reflect a well-formed type for the destructor and 5779/// returned. 5780QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5781 StorageClass& SC) { 5782 // C++ [class.dtor]p1: 5783 // [...] A typedef-name that names a class is a class-name 5784 // (7.1.3); however, a typedef-name that names a class shall not 5785 // be used as the identifier in the declarator for a destructor 5786 // declaration. 5787 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5788 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5789 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5790 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5791 else if (const TemplateSpecializationType *TST = 5792 DeclaratorType->getAs<TemplateSpecializationType>()) 5793 if (TST->isTypeAlias()) 5794 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5795 << DeclaratorType << 1; 5796 5797 // C++ [class.dtor]p2: 5798 // A destructor is used to destroy objects of its class type. A 5799 // destructor takes no parameters, and no return type can be 5800 // specified for it (not even void). The address of a destructor 5801 // shall not be taken. A destructor shall not be static. A 5802 // destructor can be invoked for a const, volatile or const 5803 // volatile object. A destructor shall not be declared const, 5804 // volatile or const volatile (9.3.2). 5805 if (SC == SC_Static) { 5806 if (!D.isInvalidType()) 5807 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5808 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5809 << SourceRange(D.getIdentifierLoc()) 5810 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5811 5812 SC = SC_None; 5813 } 5814 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5815 // Destructors don't have return types, but the parser will 5816 // happily parse something like: 5817 // 5818 // class X { 5819 // float ~X(); 5820 // }; 5821 // 5822 // The return type will be eliminated later. 5823 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5824 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5825 << SourceRange(D.getIdentifierLoc()); 5826 } 5827 5828 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5829 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5830 if (FTI.TypeQuals & Qualifiers::Const) 5831 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5832 << "const" << SourceRange(D.getIdentifierLoc()); 5833 if (FTI.TypeQuals & Qualifiers::Volatile) 5834 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5835 << "volatile" << SourceRange(D.getIdentifierLoc()); 5836 if (FTI.TypeQuals & Qualifiers::Restrict) 5837 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5838 << "restrict" << SourceRange(D.getIdentifierLoc()); 5839 D.setInvalidType(); 5840 } 5841 5842 // C++0x [class.dtor]p2: 5843 // A destructor shall not be declared with a ref-qualifier. 5844 if (FTI.hasRefQualifier()) { 5845 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5846 << FTI.RefQualifierIsLValueRef 5847 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5848 D.setInvalidType(); 5849 } 5850 5851 // Make sure we don't have any parameters. 5852 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5853 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5854 5855 // Delete the parameters. 5856 FTI.freeArgs(); 5857 D.setInvalidType(); 5858 } 5859 5860 // Make sure the destructor isn't variadic. 5861 if (FTI.isVariadic) { 5862 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5863 D.setInvalidType(); 5864 } 5865 5866 // Rebuild the function type "R" without any type qualifiers or 5867 // parameters (in case any of the errors above fired) and with 5868 // "void" as the return type, since destructors don't have return 5869 // types. 5870 if (!D.isInvalidType()) 5871 return R; 5872 5873 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5874 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5875 EPI.Variadic = false; 5876 EPI.TypeQuals = 0; 5877 EPI.RefQualifier = RQ_None; 5878 return Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI); 5879} 5880 5881/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5882/// well-formednes of the conversion function declarator @p D with 5883/// type @p R. If there are any errors in the declarator, this routine 5884/// will emit diagnostics and return true. Otherwise, it will return 5885/// false. Either way, the type @p R will be updated to reflect a 5886/// well-formed type for the conversion operator. 5887void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5888 StorageClass& SC) { 5889 // C++ [class.conv.fct]p1: 5890 // Neither parameter types nor return type can be specified. The 5891 // type of a conversion function (8.3.5) is "function taking no 5892 // parameter returning conversion-type-id." 5893 if (SC == SC_Static) { 5894 if (!D.isInvalidType()) 5895 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5896 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5897 << SourceRange(D.getIdentifierLoc()); 5898 D.setInvalidType(); 5899 SC = SC_None; 5900 } 5901 5902 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5903 5904 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5905 // Conversion functions don't have return types, but the parser will 5906 // happily parse something like: 5907 // 5908 // class X { 5909 // float operator bool(); 5910 // }; 5911 // 5912 // The return type will be changed later anyway. 5913 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5914 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5915 << SourceRange(D.getIdentifierLoc()); 5916 D.setInvalidType(); 5917 } 5918 5919 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5920 5921 // Make sure we don't have any parameters. 5922 if (Proto->getNumArgs() > 0) { 5923 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5924 5925 // Delete the parameters. 5926 D.getFunctionTypeInfo().freeArgs(); 5927 D.setInvalidType(); 5928 } else if (Proto->isVariadic()) { 5929 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5930 D.setInvalidType(); 5931 } 5932 5933 // Diagnose "&operator bool()" and other such nonsense. This 5934 // is actually a gcc extension which we don't support. 5935 if (Proto->getResultType() != ConvType) { 5936 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5937 << Proto->getResultType(); 5938 D.setInvalidType(); 5939 ConvType = Proto->getResultType(); 5940 } 5941 5942 // C++ [class.conv.fct]p4: 5943 // The conversion-type-id shall not represent a function type nor 5944 // an array type. 5945 if (ConvType->isArrayType()) { 5946 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5947 ConvType = Context.getPointerType(ConvType); 5948 D.setInvalidType(); 5949 } else if (ConvType->isFunctionType()) { 5950 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5951 ConvType = Context.getPointerType(ConvType); 5952 D.setInvalidType(); 5953 } 5954 5955 // Rebuild the function type "R" without any parameters (in case any 5956 // of the errors above fired) and with the conversion type as the 5957 // return type. 5958 if (D.isInvalidType()) 5959 R = Context.getFunctionType(ConvType, ArrayRef<QualType>(), 5960 Proto->getExtProtoInfo()); 5961 5962 // C++0x explicit conversion operators. 5963 if (D.getDeclSpec().isExplicitSpecified()) 5964 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5965 getLangOpts().CPlusPlus11 ? 5966 diag::warn_cxx98_compat_explicit_conversion_functions : 5967 diag::ext_explicit_conversion_functions) 5968 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5969} 5970 5971/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5972/// the declaration of the given C++ conversion function. This routine 5973/// is responsible for recording the conversion function in the C++ 5974/// class, if possible. 5975Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5976 assert(Conversion && "Expected to receive a conversion function declaration"); 5977 5978 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5979 5980 // Make sure we aren't redeclaring the conversion function. 5981 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5982 5983 // C++ [class.conv.fct]p1: 5984 // [...] A conversion function is never used to convert a 5985 // (possibly cv-qualified) object to the (possibly cv-qualified) 5986 // same object type (or a reference to it), to a (possibly 5987 // cv-qualified) base class of that type (or a reference to it), 5988 // or to (possibly cv-qualified) void. 5989 // FIXME: Suppress this warning if the conversion function ends up being a 5990 // virtual function that overrides a virtual function in a base class. 5991 QualType ClassType 5992 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5993 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5994 ConvType = ConvTypeRef->getPointeeType(); 5995 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5996 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5997 /* Suppress diagnostics for instantiations. */; 5998 else if (ConvType->isRecordType()) { 5999 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 6000 if (ConvType == ClassType) 6001 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 6002 << ClassType; 6003 else if (IsDerivedFrom(ClassType, ConvType)) 6004 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 6005 << ClassType << ConvType; 6006 } else if (ConvType->isVoidType()) { 6007 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 6008 << ClassType << ConvType; 6009 } 6010 6011 if (FunctionTemplateDecl *ConversionTemplate 6012 = Conversion->getDescribedFunctionTemplate()) 6013 return ConversionTemplate; 6014 6015 return Conversion; 6016} 6017 6018//===----------------------------------------------------------------------===// 6019// Namespace Handling 6020//===----------------------------------------------------------------------===// 6021 6022/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6023/// reopened. 6024static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6025 SourceLocation Loc, 6026 IdentifierInfo *II, bool *IsInline, 6027 NamespaceDecl *PrevNS) { 6028 assert(*IsInline != PrevNS->isInline()); 6029 6030 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6031 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6032 // inline namespaces, with the intention of bringing names into namespace std. 6033 // 6034 // We support this just well enough to get that case working; this is not 6035 // sufficient to support reopening namespaces as inline in general. 6036 if (*IsInline && II && II->getName().startswith("__atomic") && 6037 S.getSourceManager().isInSystemHeader(Loc)) { 6038 // Mark all prior declarations of the namespace as inline. 6039 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6040 NS = NS->getPreviousDecl()) 6041 NS->setInline(*IsInline); 6042 // Patch up the lookup table for the containing namespace. This isn't really 6043 // correct, but it's good enough for this particular case. 6044 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6045 E = PrevNS->decls_end(); I != E; ++I) 6046 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6047 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6048 return; 6049 } 6050 6051 if (PrevNS->isInline()) 6052 // The user probably just forgot the 'inline', so suggest that it 6053 // be added back. 6054 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6055 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6056 else 6057 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6058 << IsInline; 6059 6060 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6061 *IsInline = PrevNS->isInline(); 6062} 6063 6064/// ActOnStartNamespaceDef - This is called at the start of a namespace 6065/// definition. 6066Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6067 SourceLocation InlineLoc, 6068 SourceLocation NamespaceLoc, 6069 SourceLocation IdentLoc, 6070 IdentifierInfo *II, 6071 SourceLocation LBrace, 6072 AttributeList *AttrList) { 6073 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6074 // For anonymous namespace, take the location of the left brace. 6075 SourceLocation Loc = II ? IdentLoc : LBrace; 6076 bool IsInline = InlineLoc.isValid(); 6077 bool IsInvalid = false; 6078 bool IsStd = false; 6079 bool AddToKnown = false; 6080 Scope *DeclRegionScope = NamespcScope->getParent(); 6081 6082 NamespaceDecl *PrevNS = 0; 6083 if (II) { 6084 // C++ [namespace.def]p2: 6085 // The identifier in an original-namespace-definition shall not 6086 // have been previously defined in the declarative region in 6087 // which the original-namespace-definition appears. The 6088 // identifier in an original-namespace-definition is the name of 6089 // the namespace. Subsequently in that declarative region, it is 6090 // treated as an original-namespace-name. 6091 // 6092 // Since namespace names are unique in their scope, and we don't 6093 // look through using directives, just look for any ordinary names. 6094 6095 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6096 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6097 Decl::IDNS_Namespace; 6098 NamedDecl *PrevDecl = 0; 6099 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6100 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6101 ++I) { 6102 if ((*I)->getIdentifierNamespace() & IDNS) { 6103 PrevDecl = *I; 6104 break; 6105 } 6106 } 6107 6108 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6109 6110 if (PrevNS) { 6111 // This is an extended namespace definition. 6112 if (IsInline != PrevNS->isInline()) 6113 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6114 &IsInline, PrevNS); 6115 } else if (PrevDecl) { 6116 // This is an invalid name redefinition. 6117 Diag(Loc, diag::err_redefinition_different_kind) 6118 << II; 6119 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6120 IsInvalid = true; 6121 // Continue on to push Namespc as current DeclContext and return it. 6122 } else if (II->isStr("std") && 6123 CurContext->getRedeclContext()->isTranslationUnit()) { 6124 // This is the first "real" definition of the namespace "std", so update 6125 // our cache of the "std" namespace to point at this definition. 6126 PrevNS = getStdNamespace(); 6127 IsStd = true; 6128 AddToKnown = !IsInline; 6129 } else { 6130 // We've seen this namespace for the first time. 6131 AddToKnown = !IsInline; 6132 } 6133 } else { 6134 // Anonymous namespaces. 6135 6136 // Determine whether the parent already has an anonymous namespace. 6137 DeclContext *Parent = CurContext->getRedeclContext(); 6138 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6139 PrevNS = TU->getAnonymousNamespace(); 6140 } else { 6141 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6142 PrevNS = ND->getAnonymousNamespace(); 6143 } 6144 6145 if (PrevNS && IsInline != PrevNS->isInline()) 6146 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6147 &IsInline, PrevNS); 6148 } 6149 6150 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6151 StartLoc, Loc, II, PrevNS); 6152 if (IsInvalid) 6153 Namespc->setInvalidDecl(); 6154 6155 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6156 6157 // FIXME: Should we be merging attributes? 6158 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6159 PushNamespaceVisibilityAttr(Attr, Loc); 6160 6161 if (IsStd) 6162 StdNamespace = Namespc; 6163 if (AddToKnown) 6164 KnownNamespaces[Namespc] = false; 6165 6166 if (II) { 6167 PushOnScopeChains(Namespc, DeclRegionScope); 6168 } else { 6169 // Link the anonymous namespace into its parent. 6170 DeclContext *Parent = CurContext->getRedeclContext(); 6171 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6172 TU->setAnonymousNamespace(Namespc); 6173 } else { 6174 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6175 } 6176 6177 CurContext->addDecl(Namespc); 6178 6179 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6180 // behaves as if it were replaced by 6181 // namespace unique { /* empty body */ } 6182 // using namespace unique; 6183 // namespace unique { namespace-body } 6184 // where all occurrences of 'unique' in a translation unit are 6185 // replaced by the same identifier and this identifier differs 6186 // from all other identifiers in the entire program. 6187 6188 // We just create the namespace with an empty name and then add an 6189 // implicit using declaration, just like the standard suggests. 6190 // 6191 // CodeGen enforces the "universally unique" aspect by giving all 6192 // declarations semantically contained within an anonymous 6193 // namespace internal linkage. 6194 6195 if (!PrevNS) { 6196 UsingDirectiveDecl* UD 6197 = UsingDirectiveDecl::Create(Context, Parent, 6198 /* 'using' */ LBrace, 6199 /* 'namespace' */ SourceLocation(), 6200 /* qualifier */ NestedNameSpecifierLoc(), 6201 /* identifier */ SourceLocation(), 6202 Namespc, 6203 /* Ancestor */ Parent); 6204 UD->setImplicit(); 6205 Parent->addDecl(UD); 6206 } 6207 } 6208 6209 ActOnDocumentableDecl(Namespc); 6210 6211 // Although we could have an invalid decl (i.e. the namespace name is a 6212 // redefinition), push it as current DeclContext and try to continue parsing. 6213 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6214 // for the namespace has the declarations that showed up in that particular 6215 // namespace definition. 6216 PushDeclContext(NamespcScope, Namespc); 6217 return Namespc; 6218} 6219 6220/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6221/// is a namespace alias, returns the namespace it points to. 6222static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6223 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6224 return AD->getNamespace(); 6225 return dyn_cast_or_null<NamespaceDecl>(D); 6226} 6227 6228/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6229/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6230void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6231 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6232 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6233 Namespc->setRBraceLoc(RBrace); 6234 PopDeclContext(); 6235 if (Namespc->hasAttr<VisibilityAttr>()) 6236 PopPragmaVisibility(true, RBrace); 6237} 6238 6239CXXRecordDecl *Sema::getStdBadAlloc() const { 6240 return cast_or_null<CXXRecordDecl>( 6241 StdBadAlloc.get(Context.getExternalSource())); 6242} 6243 6244NamespaceDecl *Sema::getStdNamespace() const { 6245 return cast_or_null<NamespaceDecl>( 6246 StdNamespace.get(Context.getExternalSource())); 6247} 6248 6249/// \brief Retrieve the special "std" namespace, which may require us to 6250/// implicitly define the namespace. 6251NamespaceDecl *Sema::getOrCreateStdNamespace() { 6252 if (!StdNamespace) { 6253 // The "std" namespace has not yet been defined, so build one implicitly. 6254 StdNamespace = NamespaceDecl::Create(Context, 6255 Context.getTranslationUnitDecl(), 6256 /*Inline=*/false, 6257 SourceLocation(), SourceLocation(), 6258 &PP.getIdentifierTable().get("std"), 6259 /*PrevDecl=*/0); 6260 getStdNamespace()->setImplicit(true); 6261 } 6262 6263 return getStdNamespace(); 6264} 6265 6266bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6267 assert(getLangOpts().CPlusPlus && 6268 "Looking for std::initializer_list outside of C++."); 6269 6270 // We're looking for implicit instantiations of 6271 // template <typename E> class std::initializer_list. 6272 6273 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6274 return false; 6275 6276 ClassTemplateDecl *Template = 0; 6277 const TemplateArgument *Arguments = 0; 6278 6279 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6280 6281 ClassTemplateSpecializationDecl *Specialization = 6282 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6283 if (!Specialization) 6284 return false; 6285 6286 Template = Specialization->getSpecializedTemplate(); 6287 Arguments = Specialization->getTemplateArgs().data(); 6288 } else if (const TemplateSpecializationType *TST = 6289 Ty->getAs<TemplateSpecializationType>()) { 6290 Template = dyn_cast_or_null<ClassTemplateDecl>( 6291 TST->getTemplateName().getAsTemplateDecl()); 6292 Arguments = TST->getArgs(); 6293 } 6294 if (!Template) 6295 return false; 6296 6297 if (!StdInitializerList) { 6298 // Haven't recognized std::initializer_list yet, maybe this is it. 6299 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6300 if (TemplateClass->getIdentifier() != 6301 &PP.getIdentifierTable().get("initializer_list") || 6302 !getStdNamespace()->InEnclosingNamespaceSetOf( 6303 TemplateClass->getDeclContext())) 6304 return false; 6305 // This is a template called std::initializer_list, but is it the right 6306 // template? 6307 TemplateParameterList *Params = Template->getTemplateParameters(); 6308 if (Params->getMinRequiredArguments() != 1) 6309 return false; 6310 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6311 return false; 6312 6313 // It's the right template. 6314 StdInitializerList = Template; 6315 } 6316 6317 if (Template != StdInitializerList) 6318 return false; 6319 6320 // This is an instance of std::initializer_list. Find the argument type. 6321 if (Element) 6322 *Element = Arguments[0].getAsType(); 6323 return true; 6324} 6325 6326static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6327 NamespaceDecl *Std = S.getStdNamespace(); 6328 if (!Std) { 6329 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6330 return 0; 6331 } 6332 6333 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6334 Loc, Sema::LookupOrdinaryName); 6335 if (!S.LookupQualifiedName(Result, Std)) { 6336 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6337 return 0; 6338 } 6339 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6340 if (!Template) { 6341 Result.suppressDiagnostics(); 6342 // We found something weird. Complain about the first thing we found. 6343 NamedDecl *Found = *Result.begin(); 6344 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6345 return 0; 6346 } 6347 6348 // We found some template called std::initializer_list. Now verify that it's 6349 // correct. 6350 TemplateParameterList *Params = Template->getTemplateParameters(); 6351 if (Params->getMinRequiredArguments() != 1 || 6352 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6353 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6354 return 0; 6355 } 6356 6357 return Template; 6358} 6359 6360QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6361 if (!StdInitializerList) { 6362 StdInitializerList = LookupStdInitializerList(*this, Loc); 6363 if (!StdInitializerList) 6364 return QualType(); 6365 } 6366 6367 TemplateArgumentListInfo Args(Loc, Loc); 6368 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6369 Context.getTrivialTypeSourceInfo(Element, 6370 Loc))); 6371 return Context.getCanonicalType( 6372 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6373} 6374 6375bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6376 // C++ [dcl.init.list]p2: 6377 // A constructor is an initializer-list constructor if its first parameter 6378 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6379 // std::initializer_list<E> for some type E, and either there are no other 6380 // parameters or else all other parameters have default arguments. 6381 if (Ctor->getNumParams() < 1 || 6382 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6383 return false; 6384 6385 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6386 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6387 ArgType = RT->getPointeeType().getUnqualifiedType(); 6388 6389 return isStdInitializerList(ArgType, 0); 6390} 6391 6392/// \brief Determine whether a using statement is in a context where it will be 6393/// apply in all contexts. 6394static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6395 switch (CurContext->getDeclKind()) { 6396 case Decl::TranslationUnit: 6397 return true; 6398 case Decl::LinkageSpec: 6399 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6400 default: 6401 return false; 6402 } 6403} 6404 6405namespace { 6406 6407// Callback to only accept typo corrections that are namespaces. 6408class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6409 public: 6410 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6411 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6412 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6413 } 6414 return false; 6415 } 6416}; 6417 6418} 6419 6420static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6421 CXXScopeSpec &SS, 6422 SourceLocation IdentLoc, 6423 IdentifierInfo *Ident) { 6424 NamespaceValidatorCCC Validator; 6425 R.clear(); 6426 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6427 R.getLookupKind(), Sc, &SS, 6428 Validator)) { 6429 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6430 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6431 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6432 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6433 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6434 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6435 CorrectedStr); 6436 else 6437 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6438 << Ident << CorrectedQuotedStr 6439 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6440 6441 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6442 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6443 6444 R.addDecl(Corrected.getCorrectionDecl()); 6445 return true; 6446 } 6447 return false; 6448} 6449 6450Decl *Sema::ActOnUsingDirective(Scope *S, 6451 SourceLocation UsingLoc, 6452 SourceLocation NamespcLoc, 6453 CXXScopeSpec &SS, 6454 SourceLocation IdentLoc, 6455 IdentifierInfo *NamespcName, 6456 AttributeList *AttrList) { 6457 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6458 assert(NamespcName && "Invalid NamespcName."); 6459 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6460 6461 // This can only happen along a recovery path. 6462 while (S->getFlags() & Scope::TemplateParamScope) 6463 S = S->getParent(); 6464 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6465 6466 UsingDirectiveDecl *UDir = 0; 6467 NestedNameSpecifier *Qualifier = 0; 6468 if (SS.isSet()) 6469 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6470 6471 // Lookup namespace name. 6472 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6473 LookupParsedName(R, S, &SS); 6474 if (R.isAmbiguous()) 6475 return 0; 6476 6477 if (R.empty()) { 6478 R.clear(); 6479 // Allow "using namespace std;" or "using namespace ::std;" even if 6480 // "std" hasn't been defined yet, for GCC compatibility. 6481 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6482 NamespcName->isStr("std")) { 6483 Diag(IdentLoc, diag::ext_using_undefined_std); 6484 R.addDecl(getOrCreateStdNamespace()); 6485 R.resolveKind(); 6486 } 6487 // Otherwise, attempt typo correction. 6488 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6489 } 6490 6491 if (!R.empty()) { 6492 NamedDecl *Named = R.getFoundDecl(); 6493 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6494 && "expected namespace decl"); 6495 // C++ [namespace.udir]p1: 6496 // A using-directive specifies that the names in the nominated 6497 // namespace can be used in the scope in which the 6498 // using-directive appears after the using-directive. During 6499 // unqualified name lookup (3.4.1), the names appear as if they 6500 // were declared in the nearest enclosing namespace which 6501 // contains both the using-directive and the nominated 6502 // namespace. [Note: in this context, "contains" means "contains 6503 // directly or indirectly". ] 6504 6505 // Find enclosing context containing both using-directive and 6506 // nominated namespace. 6507 NamespaceDecl *NS = getNamespaceDecl(Named); 6508 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6509 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6510 CommonAncestor = CommonAncestor->getParent(); 6511 6512 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6513 SS.getWithLocInContext(Context), 6514 IdentLoc, Named, CommonAncestor); 6515 6516 if (IsUsingDirectiveInToplevelContext(CurContext) && 6517 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6518 Diag(IdentLoc, diag::warn_using_directive_in_header); 6519 } 6520 6521 PushUsingDirective(S, UDir); 6522 } else { 6523 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6524 } 6525 6526 if (UDir) 6527 ProcessDeclAttributeList(S, UDir, AttrList); 6528 6529 return UDir; 6530} 6531 6532void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6533 // If the scope has an associated entity and the using directive is at 6534 // namespace or translation unit scope, add the UsingDirectiveDecl into 6535 // its lookup structure so qualified name lookup can find it. 6536 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6537 if (Ctx && !Ctx->isFunctionOrMethod()) 6538 Ctx->addDecl(UDir); 6539 else 6540 // Otherwise, it is at block sope. The using-directives will affect lookup 6541 // only to the end of the scope. 6542 S->PushUsingDirective(UDir); 6543} 6544 6545 6546Decl *Sema::ActOnUsingDeclaration(Scope *S, 6547 AccessSpecifier AS, 6548 bool HasUsingKeyword, 6549 SourceLocation UsingLoc, 6550 CXXScopeSpec &SS, 6551 UnqualifiedId &Name, 6552 AttributeList *AttrList, 6553 bool IsTypeName, 6554 SourceLocation TypenameLoc) { 6555 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6556 6557 switch (Name.getKind()) { 6558 case UnqualifiedId::IK_ImplicitSelfParam: 6559 case UnqualifiedId::IK_Identifier: 6560 case UnqualifiedId::IK_OperatorFunctionId: 6561 case UnqualifiedId::IK_LiteralOperatorId: 6562 case UnqualifiedId::IK_ConversionFunctionId: 6563 break; 6564 6565 case UnqualifiedId::IK_ConstructorName: 6566 case UnqualifiedId::IK_ConstructorTemplateId: 6567 // C++11 inheriting constructors. 6568 Diag(Name.getLocStart(), 6569 getLangOpts().CPlusPlus11 ? 6570 diag::warn_cxx98_compat_using_decl_constructor : 6571 diag::err_using_decl_constructor) 6572 << SS.getRange(); 6573 6574 if (getLangOpts().CPlusPlus11) break; 6575 6576 return 0; 6577 6578 case UnqualifiedId::IK_DestructorName: 6579 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6580 << SS.getRange(); 6581 return 0; 6582 6583 case UnqualifiedId::IK_TemplateId: 6584 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6585 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6586 return 0; 6587 } 6588 6589 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6590 DeclarationName TargetName = TargetNameInfo.getName(); 6591 if (!TargetName) 6592 return 0; 6593 6594 // Warn about access declarations. 6595 // TODO: store that the declaration was written without 'using' and 6596 // talk about access decls instead of using decls in the 6597 // diagnostics. 6598 if (!HasUsingKeyword) { 6599 UsingLoc = Name.getLocStart(); 6600 6601 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6602 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6603 } 6604 6605 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6606 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6607 return 0; 6608 6609 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6610 TargetNameInfo, AttrList, 6611 /* IsInstantiation */ false, 6612 IsTypeName, TypenameLoc); 6613 if (UD) 6614 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6615 6616 return UD; 6617} 6618 6619/// \brief Determine whether a using declaration considers the given 6620/// declarations as "equivalent", e.g., if they are redeclarations of 6621/// the same entity or are both typedefs of the same type. 6622static bool 6623IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6624 bool &SuppressRedeclaration) { 6625 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6626 SuppressRedeclaration = false; 6627 return true; 6628 } 6629 6630 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6631 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6632 SuppressRedeclaration = true; 6633 return Context.hasSameType(TD1->getUnderlyingType(), 6634 TD2->getUnderlyingType()); 6635 } 6636 6637 return false; 6638} 6639 6640 6641/// Determines whether to create a using shadow decl for a particular 6642/// decl, given the set of decls existing prior to this using lookup. 6643bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6644 const LookupResult &Previous) { 6645 // Diagnose finding a decl which is not from a base class of the 6646 // current class. We do this now because there are cases where this 6647 // function will silently decide not to build a shadow decl, which 6648 // will pre-empt further diagnostics. 6649 // 6650 // We don't need to do this in C++0x because we do the check once on 6651 // the qualifier. 6652 // 6653 // FIXME: diagnose the following if we care enough: 6654 // struct A { int foo; }; 6655 // struct B : A { using A::foo; }; 6656 // template <class T> struct C : A {}; 6657 // template <class T> struct D : C<T> { using B::foo; } // <--- 6658 // This is invalid (during instantiation) in C++03 because B::foo 6659 // resolves to the using decl in B, which is not a base class of D<T>. 6660 // We can't diagnose it immediately because C<T> is an unknown 6661 // specialization. The UsingShadowDecl in D<T> then points directly 6662 // to A::foo, which will look well-formed when we instantiate. 6663 // The right solution is to not collapse the shadow-decl chain. 6664 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6665 DeclContext *OrigDC = Orig->getDeclContext(); 6666 6667 // Handle enums and anonymous structs. 6668 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6669 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6670 while (OrigRec->isAnonymousStructOrUnion()) 6671 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6672 6673 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6674 if (OrigDC == CurContext) { 6675 Diag(Using->getLocation(), 6676 diag::err_using_decl_nested_name_specifier_is_current_class) 6677 << Using->getQualifierLoc().getSourceRange(); 6678 Diag(Orig->getLocation(), diag::note_using_decl_target); 6679 return true; 6680 } 6681 6682 Diag(Using->getQualifierLoc().getBeginLoc(), 6683 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6684 << Using->getQualifier() 6685 << cast<CXXRecordDecl>(CurContext) 6686 << Using->getQualifierLoc().getSourceRange(); 6687 Diag(Orig->getLocation(), diag::note_using_decl_target); 6688 return true; 6689 } 6690 } 6691 6692 if (Previous.empty()) return false; 6693 6694 NamedDecl *Target = Orig; 6695 if (isa<UsingShadowDecl>(Target)) 6696 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6697 6698 // If the target happens to be one of the previous declarations, we 6699 // don't have a conflict. 6700 // 6701 // FIXME: but we might be increasing its access, in which case we 6702 // should redeclare it. 6703 NamedDecl *NonTag = 0, *Tag = 0; 6704 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6705 I != E; ++I) { 6706 NamedDecl *D = (*I)->getUnderlyingDecl(); 6707 bool Result; 6708 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6709 return Result; 6710 6711 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6712 } 6713 6714 if (Target->isFunctionOrFunctionTemplate()) { 6715 FunctionDecl *FD; 6716 if (isa<FunctionTemplateDecl>(Target)) 6717 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6718 else 6719 FD = cast<FunctionDecl>(Target); 6720 6721 NamedDecl *OldDecl = 0; 6722 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6723 case Ovl_Overload: 6724 return false; 6725 6726 case Ovl_NonFunction: 6727 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6728 break; 6729 6730 // We found a decl with the exact signature. 6731 case Ovl_Match: 6732 // If we're in a record, we want to hide the target, so we 6733 // return true (without a diagnostic) to tell the caller not to 6734 // build a shadow decl. 6735 if (CurContext->isRecord()) 6736 return true; 6737 6738 // If we're not in a record, this is an error. 6739 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6740 break; 6741 } 6742 6743 Diag(Target->getLocation(), diag::note_using_decl_target); 6744 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6745 return true; 6746 } 6747 6748 // Target is not a function. 6749 6750 if (isa<TagDecl>(Target)) { 6751 // No conflict between a tag and a non-tag. 6752 if (!Tag) return false; 6753 6754 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6755 Diag(Target->getLocation(), diag::note_using_decl_target); 6756 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6757 return true; 6758 } 6759 6760 // No conflict between a tag and a non-tag. 6761 if (!NonTag) return false; 6762 6763 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6764 Diag(Target->getLocation(), diag::note_using_decl_target); 6765 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6766 return true; 6767} 6768 6769/// Builds a shadow declaration corresponding to a 'using' declaration. 6770UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6771 UsingDecl *UD, 6772 NamedDecl *Orig) { 6773 6774 // If we resolved to another shadow declaration, just coalesce them. 6775 NamedDecl *Target = Orig; 6776 if (isa<UsingShadowDecl>(Target)) { 6777 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6778 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6779 } 6780 6781 UsingShadowDecl *Shadow 6782 = UsingShadowDecl::Create(Context, CurContext, 6783 UD->getLocation(), UD, Target); 6784 UD->addShadowDecl(Shadow); 6785 6786 Shadow->setAccess(UD->getAccess()); 6787 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6788 Shadow->setInvalidDecl(); 6789 6790 if (S) 6791 PushOnScopeChains(Shadow, S); 6792 else 6793 CurContext->addDecl(Shadow); 6794 6795 6796 return Shadow; 6797} 6798 6799/// Hides a using shadow declaration. This is required by the current 6800/// using-decl implementation when a resolvable using declaration in a 6801/// class is followed by a declaration which would hide or override 6802/// one or more of the using decl's targets; for example: 6803/// 6804/// struct Base { void foo(int); }; 6805/// struct Derived : Base { 6806/// using Base::foo; 6807/// void foo(int); 6808/// }; 6809/// 6810/// The governing language is C++03 [namespace.udecl]p12: 6811/// 6812/// When a using-declaration brings names from a base class into a 6813/// derived class scope, member functions in the derived class 6814/// override and/or hide member functions with the same name and 6815/// parameter types in a base class (rather than conflicting). 6816/// 6817/// There are two ways to implement this: 6818/// (1) optimistically create shadow decls when they're not hidden 6819/// by existing declarations, or 6820/// (2) don't create any shadow decls (or at least don't make them 6821/// visible) until we've fully parsed/instantiated the class. 6822/// The problem with (1) is that we might have to retroactively remove 6823/// a shadow decl, which requires several O(n) operations because the 6824/// decl structures are (very reasonably) not designed for removal. 6825/// (2) avoids this but is very fiddly and phase-dependent. 6826void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6827 if (Shadow->getDeclName().getNameKind() == 6828 DeclarationName::CXXConversionFunctionName) 6829 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6830 6831 // Remove it from the DeclContext... 6832 Shadow->getDeclContext()->removeDecl(Shadow); 6833 6834 // ...and the scope, if applicable... 6835 if (S) { 6836 S->RemoveDecl(Shadow); 6837 IdResolver.RemoveDecl(Shadow); 6838 } 6839 6840 // ...and the using decl. 6841 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6842 6843 // TODO: complain somehow if Shadow was used. It shouldn't 6844 // be possible for this to happen, because...? 6845} 6846 6847/// Builds a using declaration. 6848/// 6849/// \param IsInstantiation - Whether this call arises from an 6850/// instantiation of an unresolved using declaration. We treat 6851/// the lookup differently for these declarations. 6852NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6853 SourceLocation UsingLoc, 6854 CXXScopeSpec &SS, 6855 const DeclarationNameInfo &NameInfo, 6856 AttributeList *AttrList, 6857 bool IsInstantiation, 6858 bool IsTypeName, 6859 SourceLocation TypenameLoc) { 6860 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6861 SourceLocation IdentLoc = NameInfo.getLoc(); 6862 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6863 6864 // FIXME: We ignore attributes for now. 6865 6866 if (SS.isEmpty()) { 6867 Diag(IdentLoc, diag::err_using_requires_qualname); 6868 return 0; 6869 } 6870 6871 // Do the redeclaration lookup in the current scope. 6872 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6873 ForRedeclaration); 6874 Previous.setHideTags(false); 6875 if (S) { 6876 LookupName(Previous, S); 6877 6878 // It is really dumb that we have to do this. 6879 LookupResult::Filter F = Previous.makeFilter(); 6880 while (F.hasNext()) { 6881 NamedDecl *D = F.next(); 6882 if (!isDeclInScope(D, CurContext, S)) 6883 F.erase(); 6884 } 6885 F.done(); 6886 } else { 6887 assert(IsInstantiation && "no scope in non-instantiation"); 6888 assert(CurContext->isRecord() && "scope not record in instantiation"); 6889 LookupQualifiedName(Previous, CurContext); 6890 } 6891 6892 // Check for invalid redeclarations. 6893 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6894 return 0; 6895 6896 // Check for bad qualifiers. 6897 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6898 return 0; 6899 6900 DeclContext *LookupContext = computeDeclContext(SS); 6901 NamedDecl *D; 6902 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6903 if (!LookupContext) { 6904 if (IsTypeName) { 6905 // FIXME: not all declaration name kinds are legal here 6906 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6907 UsingLoc, TypenameLoc, 6908 QualifierLoc, 6909 IdentLoc, NameInfo.getName()); 6910 } else { 6911 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6912 QualifierLoc, NameInfo); 6913 } 6914 } else { 6915 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6916 NameInfo, IsTypeName); 6917 } 6918 D->setAccess(AS); 6919 CurContext->addDecl(D); 6920 6921 if (!LookupContext) return D; 6922 UsingDecl *UD = cast<UsingDecl>(D); 6923 6924 if (RequireCompleteDeclContext(SS, LookupContext)) { 6925 UD->setInvalidDecl(); 6926 return UD; 6927 } 6928 6929 // The normal rules do not apply to inheriting constructor declarations. 6930 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6931 if (CheckInheritingConstructorUsingDecl(UD)) 6932 UD->setInvalidDecl(); 6933 return UD; 6934 } 6935 6936 // Otherwise, look up the target name. 6937 6938 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6939 6940 // Unlike most lookups, we don't always want to hide tag 6941 // declarations: tag names are visible through the using declaration 6942 // even if hidden by ordinary names, *except* in a dependent context 6943 // where it's important for the sanity of two-phase lookup. 6944 if (!IsInstantiation) 6945 R.setHideTags(false); 6946 6947 // For the purposes of this lookup, we have a base object type 6948 // equal to that of the current context. 6949 if (CurContext->isRecord()) { 6950 R.setBaseObjectType( 6951 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6952 } 6953 6954 LookupQualifiedName(R, LookupContext); 6955 6956 if (R.empty()) { 6957 Diag(IdentLoc, diag::err_no_member) 6958 << NameInfo.getName() << LookupContext << SS.getRange(); 6959 UD->setInvalidDecl(); 6960 return UD; 6961 } 6962 6963 if (R.isAmbiguous()) { 6964 UD->setInvalidDecl(); 6965 return UD; 6966 } 6967 6968 if (IsTypeName) { 6969 // If we asked for a typename and got a non-type decl, error out. 6970 if (!R.getAsSingle<TypeDecl>()) { 6971 Diag(IdentLoc, diag::err_using_typename_non_type); 6972 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6973 Diag((*I)->getUnderlyingDecl()->getLocation(), 6974 diag::note_using_decl_target); 6975 UD->setInvalidDecl(); 6976 return UD; 6977 } 6978 } else { 6979 // If we asked for a non-typename and we got a type, error out, 6980 // but only if this is an instantiation of an unresolved using 6981 // decl. Otherwise just silently find the type name. 6982 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6983 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6984 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6985 UD->setInvalidDecl(); 6986 return UD; 6987 } 6988 } 6989 6990 // C++0x N2914 [namespace.udecl]p6: 6991 // A using-declaration shall not name a namespace. 6992 if (R.getAsSingle<NamespaceDecl>()) { 6993 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6994 << SS.getRange(); 6995 UD->setInvalidDecl(); 6996 return UD; 6997 } 6998 6999 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 7000 if (!CheckUsingShadowDecl(UD, *I, Previous)) 7001 BuildUsingShadowDecl(S, UD, *I); 7002 } 7003 7004 return UD; 7005} 7006 7007/// Additional checks for a using declaration referring to a constructor name. 7008bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 7009 assert(!UD->isTypeName() && "expecting a constructor name"); 7010 7011 const Type *SourceType = UD->getQualifier()->getAsType(); 7012 assert(SourceType && 7013 "Using decl naming constructor doesn't have type in scope spec."); 7014 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 7015 7016 // Check whether the named type is a direct base class. 7017 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 7018 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 7019 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 7020 BaseIt != BaseE; ++BaseIt) { 7021 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7022 if (CanonicalSourceType == BaseType) 7023 break; 7024 if (BaseIt->getType()->isDependentType()) 7025 break; 7026 } 7027 7028 if (BaseIt == BaseE) { 7029 // Did not find SourceType in the bases. 7030 Diag(UD->getUsingLocation(), 7031 diag::err_using_decl_constructor_not_in_direct_base) 7032 << UD->getNameInfo().getSourceRange() 7033 << QualType(SourceType, 0) << TargetClass; 7034 return true; 7035 } 7036 7037 if (!CurContext->isDependentContext()) 7038 BaseIt->setInheritConstructors(); 7039 7040 return false; 7041} 7042 7043/// Checks that the given using declaration is not an invalid 7044/// redeclaration. Note that this is checking only for the using decl 7045/// itself, not for any ill-formedness among the UsingShadowDecls. 7046bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7047 bool isTypeName, 7048 const CXXScopeSpec &SS, 7049 SourceLocation NameLoc, 7050 const LookupResult &Prev) { 7051 // C++03 [namespace.udecl]p8: 7052 // C++0x [namespace.udecl]p10: 7053 // A using-declaration is a declaration and can therefore be used 7054 // repeatedly where (and only where) multiple declarations are 7055 // allowed. 7056 // 7057 // That's in non-member contexts. 7058 if (!CurContext->getRedeclContext()->isRecord()) 7059 return false; 7060 7061 NestedNameSpecifier *Qual 7062 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7063 7064 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7065 NamedDecl *D = *I; 7066 7067 bool DTypename; 7068 NestedNameSpecifier *DQual; 7069 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7070 DTypename = UD->isTypeName(); 7071 DQual = UD->getQualifier(); 7072 } else if (UnresolvedUsingValueDecl *UD 7073 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7074 DTypename = false; 7075 DQual = UD->getQualifier(); 7076 } else if (UnresolvedUsingTypenameDecl *UD 7077 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7078 DTypename = true; 7079 DQual = UD->getQualifier(); 7080 } else continue; 7081 7082 // using decls differ if one says 'typename' and the other doesn't. 7083 // FIXME: non-dependent using decls? 7084 if (isTypeName != DTypename) continue; 7085 7086 // using decls differ if they name different scopes (but note that 7087 // template instantiation can cause this check to trigger when it 7088 // didn't before instantiation). 7089 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7090 Context.getCanonicalNestedNameSpecifier(DQual)) 7091 continue; 7092 7093 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7094 Diag(D->getLocation(), diag::note_using_decl) << 1; 7095 return true; 7096 } 7097 7098 return false; 7099} 7100 7101 7102/// Checks that the given nested-name qualifier used in a using decl 7103/// in the current context is appropriately related to the current 7104/// scope. If an error is found, diagnoses it and returns true. 7105bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7106 const CXXScopeSpec &SS, 7107 SourceLocation NameLoc) { 7108 DeclContext *NamedContext = computeDeclContext(SS); 7109 7110 if (!CurContext->isRecord()) { 7111 // C++03 [namespace.udecl]p3: 7112 // C++0x [namespace.udecl]p8: 7113 // A using-declaration for a class member shall be a member-declaration. 7114 7115 // If we weren't able to compute a valid scope, it must be a 7116 // dependent class scope. 7117 if (!NamedContext || NamedContext->isRecord()) { 7118 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7119 << SS.getRange(); 7120 return true; 7121 } 7122 7123 // Otherwise, everything is known to be fine. 7124 return false; 7125 } 7126 7127 // The current scope is a record. 7128 7129 // If the named context is dependent, we can't decide much. 7130 if (!NamedContext) { 7131 // FIXME: in C++0x, we can diagnose if we can prove that the 7132 // nested-name-specifier does not refer to a base class, which is 7133 // still possible in some cases. 7134 7135 // Otherwise we have to conservatively report that things might be 7136 // okay. 7137 return false; 7138 } 7139 7140 if (!NamedContext->isRecord()) { 7141 // Ideally this would point at the last name in the specifier, 7142 // but we don't have that level of source info. 7143 Diag(SS.getRange().getBegin(), 7144 diag::err_using_decl_nested_name_specifier_is_not_class) 7145 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7146 return true; 7147 } 7148 7149 if (!NamedContext->isDependentContext() && 7150 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7151 return true; 7152 7153 if (getLangOpts().CPlusPlus11) { 7154 // C++0x [namespace.udecl]p3: 7155 // In a using-declaration used as a member-declaration, the 7156 // nested-name-specifier shall name a base class of the class 7157 // being defined. 7158 7159 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7160 cast<CXXRecordDecl>(NamedContext))) { 7161 if (CurContext == NamedContext) { 7162 Diag(NameLoc, 7163 diag::err_using_decl_nested_name_specifier_is_current_class) 7164 << SS.getRange(); 7165 return true; 7166 } 7167 7168 Diag(SS.getRange().getBegin(), 7169 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7170 << (NestedNameSpecifier*) SS.getScopeRep() 7171 << cast<CXXRecordDecl>(CurContext) 7172 << SS.getRange(); 7173 return true; 7174 } 7175 7176 return false; 7177 } 7178 7179 // C++03 [namespace.udecl]p4: 7180 // A using-declaration used as a member-declaration shall refer 7181 // to a member of a base class of the class being defined [etc.]. 7182 7183 // Salient point: SS doesn't have to name a base class as long as 7184 // lookup only finds members from base classes. Therefore we can 7185 // diagnose here only if we can prove that that can't happen, 7186 // i.e. if the class hierarchies provably don't intersect. 7187 7188 // TODO: it would be nice if "definitely valid" results were cached 7189 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7190 // need to be repeated. 7191 7192 struct UserData { 7193 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7194 7195 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7196 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7197 Data->Bases.insert(Base); 7198 return true; 7199 } 7200 7201 bool hasDependentBases(const CXXRecordDecl *Class) { 7202 return !Class->forallBases(collect, this); 7203 } 7204 7205 /// Returns true if the base is dependent or is one of the 7206 /// accumulated base classes. 7207 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7208 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7209 return !Data->Bases.count(Base); 7210 } 7211 7212 bool mightShareBases(const CXXRecordDecl *Class) { 7213 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7214 } 7215 }; 7216 7217 UserData Data; 7218 7219 // Returns false if we find a dependent base. 7220 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7221 return false; 7222 7223 // Returns false if the class has a dependent base or if it or one 7224 // of its bases is present in the base set of the current context. 7225 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7226 return false; 7227 7228 Diag(SS.getRange().getBegin(), 7229 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7230 << (NestedNameSpecifier*) SS.getScopeRep() 7231 << cast<CXXRecordDecl>(CurContext) 7232 << SS.getRange(); 7233 7234 return true; 7235} 7236 7237Decl *Sema::ActOnAliasDeclaration(Scope *S, 7238 AccessSpecifier AS, 7239 MultiTemplateParamsArg TemplateParamLists, 7240 SourceLocation UsingLoc, 7241 UnqualifiedId &Name, 7242 AttributeList *AttrList, 7243 TypeResult Type) { 7244 // Skip up to the relevant declaration scope. 7245 while (S->getFlags() & Scope::TemplateParamScope) 7246 S = S->getParent(); 7247 assert((S->getFlags() & Scope::DeclScope) && 7248 "got alias-declaration outside of declaration scope"); 7249 7250 if (Type.isInvalid()) 7251 return 0; 7252 7253 bool Invalid = false; 7254 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7255 TypeSourceInfo *TInfo = 0; 7256 GetTypeFromParser(Type.get(), &TInfo); 7257 7258 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7259 return 0; 7260 7261 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7262 UPPC_DeclarationType)) { 7263 Invalid = true; 7264 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7265 TInfo->getTypeLoc().getBeginLoc()); 7266 } 7267 7268 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7269 LookupName(Previous, S); 7270 7271 // Warn about shadowing the name of a template parameter. 7272 if (Previous.isSingleResult() && 7273 Previous.getFoundDecl()->isTemplateParameter()) { 7274 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7275 Previous.clear(); 7276 } 7277 7278 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7279 "name in alias declaration must be an identifier"); 7280 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7281 Name.StartLocation, 7282 Name.Identifier, TInfo); 7283 7284 NewTD->setAccess(AS); 7285 7286 if (Invalid) 7287 NewTD->setInvalidDecl(); 7288 7289 ProcessDeclAttributeList(S, NewTD, AttrList); 7290 7291 CheckTypedefForVariablyModifiedType(S, NewTD); 7292 Invalid |= NewTD->isInvalidDecl(); 7293 7294 bool Redeclaration = false; 7295 7296 NamedDecl *NewND; 7297 if (TemplateParamLists.size()) { 7298 TypeAliasTemplateDecl *OldDecl = 0; 7299 TemplateParameterList *OldTemplateParams = 0; 7300 7301 if (TemplateParamLists.size() != 1) { 7302 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7303 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7304 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7305 } 7306 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7307 7308 // Only consider previous declarations in the same scope. 7309 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7310 /*ExplicitInstantiationOrSpecialization*/false); 7311 if (!Previous.empty()) { 7312 Redeclaration = true; 7313 7314 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7315 if (!OldDecl && !Invalid) { 7316 Diag(UsingLoc, diag::err_redefinition_different_kind) 7317 << Name.Identifier; 7318 7319 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7320 if (OldD->getLocation().isValid()) 7321 Diag(OldD->getLocation(), diag::note_previous_definition); 7322 7323 Invalid = true; 7324 } 7325 7326 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7327 if (TemplateParameterListsAreEqual(TemplateParams, 7328 OldDecl->getTemplateParameters(), 7329 /*Complain=*/true, 7330 TPL_TemplateMatch)) 7331 OldTemplateParams = OldDecl->getTemplateParameters(); 7332 else 7333 Invalid = true; 7334 7335 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7336 if (!Invalid && 7337 !Context.hasSameType(OldTD->getUnderlyingType(), 7338 NewTD->getUnderlyingType())) { 7339 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7340 // but we can't reasonably accept it. 7341 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7342 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7343 if (OldTD->getLocation().isValid()) 7344 Diag(OldTD->getLocation(), diag::note_previous_definition); 7345 Invalid = true; 7346 } 7347 } 7348 } 7349 7350 // Merge any previous default template arguments into our parameters, 7351 // and check the parameter list. 7352 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7353 TPC_TypeAliasTemplate)) 7354 return 0; 7355 7356 TypeAliasTemplateDecl *NewDecl = 7357 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7358 Name.Identifier, TemplateParams, 7359 NewTD); 7360 7361 NewDecl->setAccess(AS); 7362 7363 if (Invalid) 7364 NewDecl->setInvalidDecl(); 7365 else if (OldDecl) 7366 NewDecl->setPreviousDeclaration(OldDecl); 7367 7368 NewND = NewDecl; 7369 } else { 7370 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7371 NewND = NewTD; 7372 } 7373 7374 if (!Redeclaration) 7375 PushOnScopeChains(NewND, S); 7376 7377 ActOnDocumentableDecl(NewND); 7378 return NewND; 7379} 7380 7381Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7382 SourceLocation NamespaceLoc, 7383 SourceLocation AliasLoc, 7384 IdentifierInfo *Alias, 7385 CXXScopeSpec &SS, 7386 SourceLocation IdentLoc, 7387 IdentifierInfo *Ident) { 7388 7389 // Lookup the namespace name. 7390 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7391 LookupParsedName(R, S, &SS); 7392 7393 // Check if we have a previous declaration with the same name. 7394 NamedDecl *PrevDecl 7395 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7396 ForRedeclaration); 7397 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7398 PrevDecl = 0; 7399 7400 if (PrevDecl) { 7401 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7402 // We already have an alias with the same name that points to the same 7403 // namespace, so don't create a new one. 7404 // FIXME: At some point, we'll want to create the (redundant) 7405 // declaration to maintain better source information. 7406 if (!R.isAmbiguous() && !R.empty() && 7407 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7408 return 0; 7409 } 7410 7411 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7412 diag::err_redefinition_different_kind; 7413 Diag(AliasLoc, DiagID) << Alias; 7414 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7415 return 0; 7416 } 7417 7418 if (R.isAmbiguous()) 7419 return 0; 7420 7421 if (R.empty()) { 7422 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7423 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7424 return 0; 7425 } 7426 } 7427 7428 NamespaceAliasDecl *AliasDecl = 7429 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7430 Alias, SS.getWithLocInContext(Context), 7431 IdentLoc, R.getFoundDecl()); 7432 7433 PushOnScopeChains(AliasDecl, S); 7434 return AliasDecl; 7435} 7436 7437Sema::ImplicitExceptionSpecification 7438Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7439 CXXMethodDecl *MD) { 7440 CXXRecordDecl *ClassDecl = MD->getParent(); 7441 7442 // C++ [except.spec]p14: 7443 // An implicitly declared special member function (Clause 12) shall have an 7444 // exception-specification. [...] 7445 ImplicitExceptionSpecification ExceptSpec(*this); 7446 if (ClassDecl->isInvalidDecl()) 7447 return ExceptSpec; 7448 7449 // Direct base-class constructors. 7450 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7451 BEnd = ClassDecl->bases_end(); 7452 B != BEnd; ++B) { 7453 if (B->isVirtual()) // Handled below. 7454 continue; 7455 7456 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7457 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7458 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7459 // If this is a deleted function, add it anyway. This might be conformant 7460 // with the standard. This might not. I'm not sure. It might not matter. 7461 if (Constructor) 7462 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7463 } 7464 } 7465 7466 // Virtual base-class constructors. 7467 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7468 BEnd = ClassDecl->vbases_end(); 7469 B != BEnd; ++B) { 7470 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7471 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7472 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7473 // If this is a deleted function, add it anyway. This might be conformant 7474 // with the standard. This might not. I'm not sure. It might not matter. 7475 if (Constructor) 7476 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7477 } 7478 } 7479 7480 // Field constructors. 7481 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7482 FEnd = ClassDecl->field_end(); 7483 F != FEnd; ++F) { 7484 if (F->hasInClassInitializer()) { 7485 if (Expr *E = F->getInClassInitializer()) 7486 ExceptSpec.CalledExpr(E); 7487 else if (!F->isInvalidDecl()) 7488 // DR1351: 7489 // If the brace-or-equal-initializer of a non-static data member 7490 // invokes a defaulted default constructor of its class or of an 7491 // enclosing class in a potentially evaluated subexpression, the 7492 // program is ill-formed. 7493 // 7494 // This resolution is unworkable: the exception specification of the 7495 // default constructor can be needed in an unevaluated context, in 7496 // particular, in the operand of a noexcept-expression, and we can be 7497 // unable to compute an exception specification for an enclosed class. 7498 // 7499 // We do not allow an in-class initializer to require the evaluation 7500 // of the exception specification for any in-class initializer whose 7501 // definition is not lexically complete. 7502 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7503 } else if (const RecordType *RecordTy 7504 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7505 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7506 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7507 // If this is a deleted function, add it anyway. This might be conformant 7508 // with the standard. This might not. I'm not sure. It might not matter. 7509 // In particular, the problem is that this function never gets called. It 7510 // might just be ill-formed because this function attempts to refer to 7511 // a deleted function here. 7512 if (Constructor) 7513 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7514 } 7515 } 7516 7517 return ExceptSpec; 7518} 7519 7520Sema::ImplicitExceptionSpecification 7521Sema::ComputeInheritingCtorExceptionSpec(CXXConstructorDecl *CD) { 7522 CXXRecordDecl *ClassDecl = CD->getParent(); 7523 7524 // C++ [except.spec]p14: 7525 // An inheriting constructor [...] shall have an exception-specification. [...] 7526 ImplicitExceptionSpecification ExceptSpec(*this); 7527 if (ClassDecl->isInvalidDecl()) 7528 return ExceptSpec; 7529 7530 // Inherited constructor. 7531 const CXXConstructorDecl *InheritedCD = CD->getInheritedConstructor(); 7532 const CXXRecordDecl *InheritedDecl = InheritedCD->getParent(); 7533 // FIXME: Copying or moving the parameters could add extra exceptions to the 7534 // set, as could the default arguments for the inherited constructor. This 7535 // will be addressed when we implement the resolution of core issue 1351. 7536 ExceptSpec.CalledDecl(CD->getLocStart(), InheritedCD); 7537 7538 // Direct base-class constructors. 7539 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7540 BEnd = ClassDecl->bases_end(); 7541 B != BEnd; ++B) { 7542 if (B->isVirtual()) // Handled below. 7543 continue; 7544 7545 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7546 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7547 if (BaseClassDecl == InheritedDecl) 7548 continue; 7549 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7550 if (Constructor) 7551 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7552 } 7553 } 7554 7555 // Virtual base-class constructors. 7556 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7557 BEnd = ClassDecl->vbases_end(); 7558 B != BEnd; ++B) { 7559 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7560 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7561 if (BaseClassDecl == InheritedDecl) 7562 continue; 7563 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7564 if (Constructor) 7565 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7566 } 7567 } 7568 7569 // Field constructors. 7570 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7571 FEnd = ClassDecl->field_end(); 7572 F != FEnd; ++F) { 7573 if (F->hasInClassInitializer()) { 7574 if (Expr *E = F->getInClassInitializer()) 7575 ExceptSpec.CalledExpr(E); 7576 else if (!F->isInvalidDecl()) 7577 Diag(CD->getLocation(), 7578 diag::err_in_class_initializer_references_def_ctor) << CD; 7579 } else if (const RecordType *RecordTy 7580 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7581 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7582 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7583 if (Constructor) 7584 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7585 } 7586 } 7587 7588 return ExceptSpec; 7589} 7590 7591namespace { 7592/// RAII object to register a special member as being currently declared. 7593struct DeclaringSpecialMember { 7594 Sema &S; 7595 Sema::SpecialMemberDecl D; 7596 bool WasAlreadyBeingDeclared; 7597 7598 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7599 : S(S), D(RD, CSM) { 7600 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7601 if (WasAlreadyBeingDeclared) 7602 // This almost never happens, but if it does, ensure that our cache 7603 // doesn't contain a stale result. 7604 S.SpecialMemberCache.clear(); 7605 7606 // FIXME: Register a note to be produced if we encounter an error while 7607 // declaring the special member. 7608 } 7609 ~DeclaringSpecialMember() { 7610 if (!WasAlreadyBeingDeclared) 7611 S.SpecialMembersBeingDeclared.erase(D); 7612 } 7613 7614 /// \brief Are we already trying to declare this special member? 7615 bool isAlreadyBeingDeclared() const { 7616 return WasAlreadyBeingDeclared; 7617 } 7618}; 7619} 7620 7621CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7622 CXXRecordDecl *ClassDecl) { 7623 // C++ [class.ctor]p5: 7624 // A default constructor for a class X is a constructor of class X 7625 // that can be called without an argument. If there is no 7626 // user-declared constructor for class X, a default constructor is 7627 // implicitly declared. An implicitly-declared default constructor 7628 // is an inline public member of its class. 7629 assert(ClassDecl->needsImplicitDefaultConstructor() && 7630 "Should not build implicit default constructor!"); 7631 7632 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7633 if (DSM.isAlreadyBeingDeclared()) 7634 return 0; 7635 7636 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7637 CXXDefaultConstructor, 7638 false); 7639 7640 // Create the actual constructor declaration. 7641 CanQualType ClassType 7642 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7643 SourceLocation ClassLoc = ClassDecl->getLocation(); 7644 DeclarationName Name 7645 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7646 DeclarationNameInfo NameInfo(Name, ClassLoc); 7647 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7648 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7649 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7650 Constexpr); 7651 DefaultCon->setAccess(AS_public); 7652 DefaultCon->setDefaulted(); 7653 DefaultCon->setImplicit(); 7654 7655 // Build an exception specification pointing back at this constructor. 7656 FunctionProtoType::ExtProtoInfo EPI; 7657 EPI.ExceptionSpecType = EST_Unevaluated; 7658 EPI.ExceptionSpecDecl = DefaultCon; 7659 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 7660 ArrayRef<QualType>(), 7661 EPI)); 7662 7663 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7664 // constructors is easy to compute. 7665 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7666 7667 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7668 SetDeclDeleted(DefaultCon, ClassLoc); 7669 7670 // Note that we have declared this constructor. 7671 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7672 7673 if (Scope *S = getScopeForContext(ClassDecl)) 7674 PushOnScopeChains(DefaultCon, S, false); 7675 ClassDecl->addDecl(DefaultCon); 7676 7677 return DefaultCon; 7678} 7679 7680void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7681 CXXConstructorDecl *Constructor) { 7682 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7683 !Constructor->doesThisDeclarationHaveABody() && 7684 !Constructor->isDeleted()) && 7685 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7686 7687 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7688 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7689 7690 SynthesizedFunctionScope Scope(*this, Constructor); 7691 DiagnosticErrorTrap Trap(Diags); 7692 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7693 Trap.hasErrorOccurred()) { 7694 Diag(CurrentLocation, diag::note_member_synthesized_at) 7695 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7696 Constructor->setInvalidDecl(); 7697 return; 7698 } 7699 7700 SourceLocation Loc = Constructor->getLocation(); 7701 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7702 7703 Constructor->setUsed(); 7704 MarkVTableUsed(CurrentLocation, ClassDecl); 7705 7706 if (ASTMutationListener *L = getASTMutationListener()) { 7707 L->CompletedImplicitDefinition(Constructor); 7708 } 7709} 7710 7711void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7712 // Check that any explicitly-defaulted methods have exception specifications 7713 // compatible with their implicit exception specifications. 7714 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7715} 7716 7717namespace { 7718/// Information on inheriting constructors to declare. 7719class InheritingConstructorInfo { 7720public: 7721 InheritingConstructorInfo(Sema &SemaRef, CXXRecordDecl *Derived) 7722 : SemaRef(SemaRef), Derived(Derived) { 7723 // Mark the constructors that we already have in the derived class. 7724 // 7725 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7726 // unless there is a user-declared constructor with the same signature in 7727 // the class where the using-declaration appears. 7728 visitAll(Derived, &InheritingConstructorInfo::noteDeclaredInDerived); 7729 } 7730 7731 void inheritAll(CXXRecordDecl *RD) { 7732 visitAll(RD, &InheritingConstructorInfo::inherit); 7733 } 7734 7735private: 7736 /// Information about an inheriting constructor. 7737 struct InheritingConstructor { 7738 InheritingConstructor() 7739 : DeclaredInDerived(false), BaseCtor(0), DerivedCtor(0) {} 7740 7741 /// If \c true, a constructor with this signature is already declared 7742 /// in the derived class. 7743 bool DeclaredInDerived; 7744 7745 /// The constructor which is inherited. 7746 const CXXConstructorDecl *BaseCtor; 7747 7748 /// The derived constructor we declared. 7749 CXXConstructorDecl *DerivedCtor; 7750 }; 7751 7752 /// Inheriting constructors with a given canonical type. There can be at 7753 /// most one such non-template constructor, and any number of templated 7754 /// constructors. 7755 struct InheritingConstructorsForType { 7756 InheritingConstructor NonTemplate; 7757 llvm::SmallVector< 7758 std::pair<TemplateParameterList*, InheritingConstructor>, 4> Templates; 7759 7760 InheritingConstructor &getEntry(Sema &S, const CXXConstructorDecl *Ctor) { 7761 if (FunctionTemplateDecl *FTD = Ctor->getDescribedFunctionTemplate()) { 7762 TemplateParameterList *ParamList = FTD->getTemplateParameters(); 7763 for (unsigned I = 0, N = Templates.size(); I != N; ++I) 7764 if (S.TemplateParameterListsAreEqual(ParamList, Templates[I].first, 7765 false, S.TPL_TemplateMatch)) 7766 return Templates[I].second; 7767 Templates.push_back(std::make_pair(ParamList, InheritingConstructor())); 7768 return Templates.back().second; 7769 } 7770 7771 return NonTemplate; 7772 } 7773 }; 7774 7775 /// Get or create the inheriting constructor record for a constructor. 7776 InheritingConstructor &getEntry(const CXXConstructorDecl *Ctor, 7777 QualType CtorType) { 7778 return Map[CtorType.getCanonicalType()->castAs<FunctionProtoType>()] 7779 .getEntry(SemaRef, Ctor); 7780 } 7781 7782 typedef void (InheritingConstructorInfo::*VisitFn)(const CXXConstructorDecl*); 7783 7784 /// Process all constructors for a class. 7785 void visitAll(const CXXRecordDecl *RD, VisitFn Callback) { 7786 for (CXXRecordDecl::ctor_iterator CtorIt = RD->ctor_begin(), 7787 CtorE = RD->ctor_end(); 7788 CtorIt != CtorE; ++CtorIt) 7789 (this->*Callback)(*CtorIt); 7790 for (CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> 7791 I(RD->decls_begin()), E(RD->decls_end()); 7792 I != E; ++I) { 7793 const FunctionDecl *FD = (*I)->getTemplatedDecl(); 7794 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(FD)) 7795 (this->*Callback)(CD); 7796 } 7797 } 7798 7799 /// Note that a constructor (or constructor template) was declared in Derived. 7800 void noteDeclaredInDerived(const CXXConstructorDecl *Ctor) { 7801 getEntry(Ctor, Ctor->getType()).DeclaredInDerived = true; 7802 } 7803 7804 /// Inherit a single constructor. 7805 void inherit(const CXXConstructorDecl *Ctor) { 7806 const FunctionProtoType *CtorType = 7807 Ctor->getType()->castAs<FunctionProtoType>(); 7808 ArrayRef<QualType> ArgTypes(CtorType->getArgTypes()); 7809 FunctionProtoType::ExtProtoInfo EPI = CtorType->getExtProtoInfo(); 7810 7811 SourceLocation UsingLoc = getUsingLoc(Ctor->getParent()); 7812 7813 // Core issue (no number yet): the ellipsis is always discarded. 7814 if (EPI.Variadic) { 7815 SemaRef.Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 7816 SemaRef.Diag(Ctor->getLocation(), 7817 diag::note_using_decl_constructor_ellipsis); 7818 EPI.Variadic = false; 7819 } 7820 7821 // Declare a constructor for each number of parameters. 7822 // 7823 // C++11 [class.inhctor]p1: 7824 // The candidate set of inherited constructors from the class X named in 7825 // the using-declaration consists of [... modulo defects ...] for each 7826 // constructor or constructor template of X, the set of constructors or 7827 // constructor templates that results from omitting any ellipsis parameter 7828 // specification and successively omitting parameters with a default 7829 // argument from the end of the parameter-type-list 7830 unsigned MinParams = minParamsToInherit(Ctor); 7831 unsigned Params = Ctor->getNumParams(); 7832 if (Params >= MinParams) { 7833 do 7834 declareCtor(UsingLoc, Ctor, 7835 SemaRef.Context.getFunctionType( 7836 Ctor->getResultType(), ArgTypes.slice(0, Params), EPI)); 7837 while (Params > MinParams && 7838 Ctor->getParamDecl(--Params)->hasDefaultArg()); 7839 } 7840 } 7841 7842 /// Find the using-declaration which specified that we should inherit the 7843 /// constructors of \p Base. 7844 SourceLocation getUsingLoc(const CXXRecordDecl *Base) { 7845 // No fancy lookup required; just look for the base constructor name 7846 // directly within the derived class. 7847 ASTContext &Context = SemaRef.Context; 7848 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 7849 Context.getCanonicalType(Context.getRecordType(Base))); 7850 DeclContext::lookup_const_result Decls = Derived->lookup(Name); 7851 return Decls.empty() ? Derived->getLocation() : Decls[0]->getLocation(); 7852 } 7853 7854 unsigned minParamsToInherit(const CXXConstructorDecl *Ctor) { 7855 // C++11 [class.inhctor]p3: 7856 // [F]or each constructor template in the candidate set of inherited 7857 // constructors, a constructor template is implicitly declared 7858 if (Ctor->getDescribedFunctionTemplate()) 7859 return 0; 7860 7861 // For each non-template constructor in the candidate set of inherited 7862 // constructors other than a constructor having no parameters or a 7863 // copy/move constructor having a single parameter, a constructor is 7864 // implicitly declared [...] 7865 if (Ctor->getNumParams() == 0) 7866 return 1; 7867 if (Ctor->isCopyOrMoveConstructor()) 7868 return 2; 7869 7870 // Per discussion on core reflector, never inherit a constructor which 7871 // would become a default, copy, or move constructor of Derived either. 7872 const ParmVarDecl *PD = Ctor->getParamDecl(0); 7873 const ReferenceType *RT = PD->getType()->getAs<ReferenceType>(); 7874 return (RT && RT->getPointeeCXXRecordDecl() == Derived) ? 2 : 1; 7875 } 7876 7877 /// Declare a single inheriting constructor, inheriting the specified 7878 /// constructor, with the given type. 7879 void declareCtor(SourceLocation UsingLoc, const CXXConstructorDecl *BaseCtor, 7880 QualType DerivedType) { 7881 InheritingConstructor &Entry = getEntry(BaseCtor, DerivedType); 7882 7883 // C++11 [class.inhctor]p3: 7884 // ... a constructor is implicitly declared with the same constructor 7885 // characteristics unless there is a user-declared constructor with 7886 // the same signature in the class where the using-declaration appears 7887 if (Entry.DeclaredInDerived) 7888 return; 7889 7890 // C++11 [class.inhctor]p7: 7891 // If two using-declarations declare inheriting constructors with the 7892 // same signature, the program is ill-formed 7893 if (Entry.DerivedCtor) { 7894 if (BaseCtor->getParent() != Entry.BaseCtor->getParent()) { 7895 // Only diagnose this once per constructor. 7896 if (Entry.DerivedCtor->isInvalidDecl()) 7897 return; 7898 Entry.DerivedCtor->setInvalidDecl(); 7899 7900 SemaRef.Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7901 SemaRef.Diag(BaseCtor->getLocation(), 7902 diag::note_using_decl_constructor_conflict_current_ctor); 7903 SemaRef.Diag(Entry.BaseCtor->getLocation(), 7904 diag::note_using_decl_constructor_conflict_previous_ctor); 7905 SemaRef.Diag(Entry.DerivedCtor->getLocation(), 7906 diag::note_using_decl_constructor_conflict_previous_using); 7907 } else { 7908 // Core issue (no number): if the same inheriting constructor is 7909 // produced by multiple base class constructors from the same base 7910 // class, the inheriting constructor is defined as deleted. 7911 SemaRef.SetDeclDeleted(Entry.DerivedCtor, UsingLoc); 7912 } 7913 7914 return; 7915 } 7916 7917 ASTContext &Context = SemaRef.Context; 7918 DeclarationName Name = Context.DeclarationNames.getCXXConstructorName( 7919 Context.getCanonicalType(Context.getRecordType(Derived))); 7920 DeclarationNameInfo NameInfo(Name, UsingLoc); 7921 7922 TemplateParameterList *TemplateParams = 0; 7923 if (const FunctionTemplateDecl *FTD = 7924 BaseCtor->getDescribedFunctionTemplate()) { 7925 TemplateParams = FTD->getTemplateParameters(); 7926 // We're reusing template parameters from a different DeclContext. This 7927 // is questionable at best, but works out because the template depth in 7928 // both places is guaranteed to be 0. 7929 // FIXME: Rebuild the template parameters in the new context, and 7930 // transform the function type to refer to them. 7931 } 7932 7933 // Build type source info pointing at the using-declaration. This is 7934 // required by template instantiation. 7935 TypeSourceInfo *TInfo = 7936 Context.getTrivialTypeSourceInfo(DerivedType, UsingLoc); 7937 FunctionProtoTypeLoc ProtoLoc = 7938 TInfo->getTypeLoc().IgnoreParens().castAs<FunctionProtoTypeLoc>(); 7939 7940 CXXConstructorDecl *DerivedCtor = CXXConstructorDecl::Create( 7941 Context, Derived, UsingLoc, NameInfo, DerivedType, 7942 TInfo, BaseCtor->isExplicit(), /*Inline=*/true, 7943 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 7944 7945 // Build an unevaluated exception specification for this constructor. 7946 const FunctionProtoType *FPT = DerivedType->castAs<FunctionProtoType>(); 7947 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 7948 EPI.ExceptionSpecType = EST_Unevaluated; 7949 EPI.ExceptionSpecDecl = DerivedCtor; 7950 DerivedCtor->setType(Context.getFunctionType(FPT->getResultType(), 7951 FPT->getArgTypes(), EPI)); 7952 7953 // Build the parameter declarations. 7954 SmallVector<ParmVarDecl *, 16> ParamDecls; 7955 for (unsigned I = 0, N = FPT->getNumArgs(); I != N; ++I) { 7956 TypeSourceInfo *TInfo = 7957 Context.getTrivialTypeSourceInfo(FPT->getArgType(I), UsingLoc); 7958 ParmVarDecl *PD = ParmVarDecl::Create( 7959 Context, DerivedCtor, UsingLoc, UsingLoc, /*IdentifierInfo=*/0, 7960 FPT->getArgType(I), TInfo, SC_None, /*DefaultArg=*/0); 7961 PD->setScopeInfo(0, I); 7962 PD->setImplicit(); 7963 ParamDecls.push_back(PD); 7964 ProtoLoc.setArg(I, PD); 7965 } 7966 7967 // Set up the new constructor. 7968 DerivedCtor->setAccess(BaseCtor->getAccess()); 7969 DerivedCtor->setParams(ParamDecls); 7970 DerivedCtor->setInheritedConstructor(BaseCtor); 7971 if (BaseCtor->isDeleted()) 7972 SemaRef.SetDeclDeleted(DerivedCtor, UsingLoc); 7973 7974 // If this is a constructor template, build the template declaration. 7975 if (TemplateParams) { 7976 FunctionTemplateDecl *DerivedTemplate = 7977 FunctionTemplateDecl::Create(SemaRef.Context, Derived, UsingLoc, Name, 7978 TemplateParams, DerivedCtor); 7979 DerivedTemplate->setAccess(BaseCtor->getAccess()); 7980 DerivedCtor->setDescribedFunctionTemplate(DerivedTemplate); 7981 Derived->addDecl(DerivedTemplate); 7982 } else { 7983 Derived->addDecl(DerivedCtor); 7984 } 7985 7986 Entry.BaseCtor = BaseCtor; 7987 Entry.DerivedCtor = DerivedCtor; 7988 } 7989 7990 Sema &SemaRef; 7991 CXXRecordDecl *Derived; 7992 typedef llvm::DenseMap<const Type *, InheritingConstructorsForType> MapType; 7993 MapType Map; 7994}; 7995} 7996 7997void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 7998 // Defer declaring the inheriting constructors until the class is 7999 // instantiated. 8000 if (ClassDecl->isDependentContext()) 8001 return; 8002 8003 // Find base classes from which we might inherit constructors. 8004 SmallVector<CXXRecordDecl*, 4> InheritedBases; 8005 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 8006 BaseE = ClassDecl->bases_end(); 8007 BaseIt != BaseE; ++BaseIt) 8008 if (BaseIt->getInheritConstructors()) 8009 InheritedBases.push_back(BaseIt->getType()->getAsCXXRecordDecl()); 8010 8011 // Go no further if we're not inheriting any constructors. 8012 if (InheritedBases.empty()) 8013 return; 8014 8015 // Declare the inherited constructors. 8016 InheritingConstructorInfo ICI(*this, ClassDecl); 8017 for (unsigned I = 0, N = InheritedBases.size(); I != N; ++I) 8018 ICI.inheritAll(InheritedBases[I]); 8019} 8020 8021void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 8022 CXXConstructorDecl *Constructor) { 8023 CXXRecordDecl *ClassDecl = Constructor->getParent(); 8024 assert(Constructor->getInheritedConstructor() && 8025 !Constructor->doesThisDeclarationHaveABody() && 8026 !Constructor->isDeleted()); 8027 8028 SynthesizedFunctionScope Scope(*this, Constructor); 8029 DiagnosticErrorTrap Trap(Diags); 8030 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 8031 Trap.hasErrorOccurred()) { 8032 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 8033 << Context.getTagDeclType(ClassDecl); 8034 Constructor->setInvalidDecl(); 8035 return; 8036 } 8037 8038 SourceLocation Loc = Constructor->getLocation(); 8039 Constructor->setBody(new (Context) CompoundStmt(Loc)); 8040 8041 Constructor->setUsed(); 8042 MarkVTableUsed(CurrentLocation, ClassDecl); 8043 8044 if (ASTMutationListener *L = getASTMutationListener()) { 8045 L->CompletedImplicitDefinition(Constructor); 8046 } 8047} 8048 8049 8050Sema::ImplicitExceptionSpecification 8051Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 8052 CXXRecordDecl *ClassDecl = MD->getParent(); 8053 8054 // C++ [except.spec]p14: 8055 // An implicitly declared special member function (Clause 12) shall have 8056 // an exception-specification. 8057 ImplicitExceptionSpecification ExceptSpec(*this); 8058 if (ClassDecl->isInvalidDecl()) 8059 return ExceptSpec; 8060 8061 // Direct base-class destructors. 8062 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8063 BEnd = ClassDecl->bases_end(); 8064 B != BEnd; ++B) { 8065 if (B->isVirtual()) // Handled below. 8066 continue; 8067 8068 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8069 ExceptSpec.CalledDecl(B->getLocStart(), 8070 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8071 } 8072 8073 // Virtual base-class destructors. 8074 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8075 BEnd = ClassDecl->vbases_end(); 8076 B != BEnd; ++B) { 8077 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 8078 ExceptSpec.CalledDecl(B->getLocStart(), 8079 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 8080 } 8081 8082 // Field destructors. 8083 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8084 FEnd = ClassDecl->field_end(); 8085 F != FEnd; ++F) { 8086 if (const RecordType *RecordTy 8087 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 8088 ExceptSpec.CalledDecl(F->getLocation(), 8089 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 8090 } 8091 8092 return ExceptSpec; 8093} 8094 8095CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 8096 // C++ [class.dtor]p2: 8097 // If a class has no user-declared destructor, a destructor is 8098 // declared implicitly. An implicitly-declared destructor is an 8099 // inline public member of its class. 8100 assert(ClassDecl->needsImplicitDestructor()); 8101 8102 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 8103 if (DSM.isAlreadyBeingDeclared()) 8104 return 0; 8105 8106 // Create the actual destructor declaration. 8107 CanQualType ClassType 8108 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 8109 SourceLocation ClassLoc = ClassDecl->getLocation(); 8110 DeclarationName Name 8111 = Context.DeclarationNames.getCXXDestructorName(ClassType); 8112 DeclarationNameInfo NameInfo(Name, ClassLoc); 8113 CXXDestructorDecl *Destructor 8114 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 8115 QualType(), 0, /*isInline=*/true, 8116 /*isImplicitlyDeclared=*/true); 8117 Destructor->setAccess(AS_public); 8118 Destructor->setDefaulted(); 8119 Destructor->setImplicit(); 8120 8121 // Build an exception specification pointing back at this destructor. 8122 FunctionProtoType::ExtProtoInfo EPI; 8123 EPI.ExceptionSpecType = EST_Unevaluated; 8124 EPI.ExceptionSpecDecl = Destructor; 8125 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8126 ArrayRef<QualType>(), 8127 EPI)); 8128 8129 AddOverriddenMethods(ClassDecl, Destructor); 8130 8131 // We don't need to use SpecialMemberIsTrivial here; triviality for 8132 // destructors is easy to compute. 8133 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 8134 8135 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 8136 SetDeclDeleted(Destructor, ClassLoc); 8137 8138 // Note that we have declared this destructor. 8139 ++ASTContext::NumImplicitDestructorsDeclared; 8140 8141 // Introduce this destructor into its scope. 8142 if (Scope *S = getScopeForContext(ClassDecl)) 8143 PushOnScopeChains(Destructor, S, false); 8144 ClassDecl->addDecl(Destructor); 8145 8146 return Destructor; 8147} 8148 8149void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 8150 CXXDestructorDecl *Destructor) { 8151 assert((Destructor->isDefaulted() && 8152 !Destructor->doesThisDeclarationHaveABody() && 8153 !Destructor->isDeleted()) && 8154 "DefineImplicitDestructor - call it for implicit default dtor"); 8155 CXXRecordDecl *ClassDecl = Destructor->getParent(); 8156 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 8157 8158 if (Destructor->isInvalidDecl()) 8159 return; 8160 8161 SynthesizedFunctionScope Scope(*this, Destructor); 8162 8163 DiagnosticErrorTrap Trap(Diags); 8164 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 8165 Destructor->getParent()); 8166 8167 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 8168 Diag(CurrentLocation, diag::note_member_synthesized_at) 8169 << CXXDestructor << Context.getTagDeclType(ClassDecl); 8170 8171 Destructor->setInvalidDecl(); 8172 return; 8173 } 8174 8175 SourceLocation Loc = Destructor->getLocation(); 8176 Destructor->setBody(new (Context) CompoundStmt(Loc)); 8177 Destructor->setImplicitlyDefined(true); 8178 Destructor->setUsed(); 8179 MarkVTableUsed(CurrentLocation, ClassDecl); 8180 8181 if (ASTMutationListener *L = getASTMutationListener()) { 8182 L->CompletedImplicitDefinition(Destructor); 8183 } 8184} 8185 8186/// \brief Perform any semantic analysis which needs to be delayed until all 8187/// pending class member declarations have been parsed. 8188void Sema::ActOnFinishCXXMemberDecls() { 8189 // If the context is an invalid C++ class, just suppress these checks. 8190 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8191 if (Record->isInvalidDecl()) { 8192 DelayedDestructorExceptionSpecChecks.clear(); 8193 return; 8194 } 8195 } 8196 8197 // Perform any deferred checking of exception specifications for virtual 8198 // destructors. 8199 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8200 i != e; ++i) { 8201 const CXXDestructorDecl *Dtor = 8202 DelayedDestructorExceptionSpecChecks[i].first; 8203 assert(!Dtor->getParent()->isDependentType() && 8204 "Should not ever add destructors of templates into the list."); 8205 CheckOverridingFunctionExceptionSpec(Dtor, 8206 DelayedDestructorExceptionSpecChecks[i].second); 8207 } 8208 DelayedDestructorExceptionSpecChecks.clear(); 8209} 8210 8211void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8212 CXXDestructorDecl *Destructor) { 8213 assert(getLangOpts().CPlusPlus11 && 8214 "adjusting dtor exception specs was introduced in c++11"); 8215 8216 // C++11 [class.dtor]p3: 8217 // A declaration of a destructor that does not have an exception- 8218 // specification is implicitly considered to have the same exception- 8219 // specification as an implicit declaration. 8220 const FunctionProtoType *DtorType = Destructor->getType()-> 8221 getAs<FunctionProtoType>(); 8222 if (DtorType->hasExceptionSpec()) 8223 return; 8224 8225 // Replace the destructor's type, building off the existing one. Fortunately, 8226 // the only thing of interest in the destructor type is its extended info. 8227 // The return and arguments are fixed. 8228 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8229 EPI.ExceptionSpecType = EST_Unevaluated; 8230 EPI.ExceptionSpecDecl = Destructor; 8231 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8232 ArrayRef<QualType>(), 8233 EPI)); 8234 8235 // FIXME: If the destructor has a body that could throw, and the newly created 8236 // spec doesn't allow exceptions, we should emit a warning, because this 8237 // change in behavior can break conforming C++03 programs at runtime. 8238 // However, we don't have a body or an exception specification yet, so it 8239 // needs to be done somewhere else. 8240} 8241 8242/// When generating a defaulted copy or move assignment operator, if a field 8243/// should be copied with __builtin_memcpy rather than via explicit assignments, 8244/// do so. This optimization only applies for arrays of scalars, and for arrays 8245/// of class type where the selected copy/move-assignment operator is trivial. 8246static StmtResult 8247buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8248 Expr *To, Expr *From) { 8249 // Compute the size of the memory buffer to be copied. 8250 QualType SizeType = S.Context.getSizeType(); 8251 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8252 S.Context.getTypeSizeInChars(T).getQuantity()); 8253 8254 // Take the address of the field references for "from" and "to". We 8255 // directly construct UnaryOperators here because semantic analysis 8256 // does not permit us to take the address of an xvalue. 8257 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8258 S.Context.getPointerType(From->getType()), 8259 VK_RValue, OK_Ordinary, Loc); 8260 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8261 S.Context.getPointerType(To->getType()), 8262 VK_RValue, OK_Ordinary, Loc); 8263 8264 const Type *E = T->getBaseElementTypeUnsafe(); 8265 bool NeedsCollectableMemCpy = 8266 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8267 8268 // Create a reference to the __builtin_objc_memmove_collectable function 8269 StringRef MemCpyName = NeedsCollectableMemCpy ? 8270 "__builtin_objc_memmove_collectable" : 8271 "__builtin_memcpy"; 8272 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8273 Sema::LookupOrdinaryName); 8274 S.LookupName(R, S.TUScope, true); 8275 8276 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8277 if (!MemCpy) 8278 // Something went horribly wrong earlier, and we will have complained 8279 // about it. 8280 return StmtError(); 8281 8282 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8283 VK_RValue, Loc, 0); 8284 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8285 8286 Expr *CallArgs[] = { 8287 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8288 }; 8289 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8290 Loc, CallArgs, Loc); 8291 8292 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8293 return S.Owned(Call.takeAs<Stmt>()); 8294} 8295 8296/// \brief Builds a statement that copies/moves the given entity from \p From to 8297/// \c To. 8298/// 8299/// This routine is used to copy/move the members of a class with an 8300/// implicitly-declared copy/move assignment operator. When the entities being 8301/// copied are arrays, this routine builds for loops to copy them. 8302/// 8303/// \param S The Sema object used for type-checking. 8304/// 8305/// \param Loc The location where the implicit copy/move is being generated. 8306/// 8307/// \param T The type of the expressions being copied/moved. Both expressions 8308/// must have this type. 8309/// 8310/// \param To The expression we are copying/moving to. 8311/// 8312/// \param From The expression we are copying/moving from. 8313/// 8314/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8315/// Otherwise, it's a non-static member subobject. 8316/// 8317/// \param Copying Whether we're copying or moving. 8318/// 8319/// \param Depth Internal parameter recording the depth of the recursion. 8320/// 8321/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8322/// if a memcpy should be used instead. 8323static StmtResult 8324buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8325 Expr *To, Expr *From, 8326 bool CopyingBaseSubobject, bool Copying, 8327 unsigned Depth = 0) { 8328 // C++11 [class.copy]p28: 8329 // Each subobject is assigned in the manner appropriate to its type: 8330 // 8331 // - if the subobject is of class type, as if by a call to operator= with 8332 // the subobject as the object expression and the corresponding 8333 // subobject of x as a single function argument (as if by explicit 8334 // qualification; that is, ignoring any possible virtual overriding 8335 // functions in more derived classes); 8336 // 8337 // C++03 [class.copy]p13: 8338 // - if the subobject is of class type, the copy assignment operator for 8339 // the class is used (as if by explicit qualification; that is, 8340 // ignoring any possible virtual overriding functions in more derived 8341 // classes); 8342 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8343 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8344 8345 // Look for operator=. 8346 DeclarationName Name 8347 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8348 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8349 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8350 8351 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8352 // operator. 8353 if (!S.getLangOpts().CPlusPlus11) { 8354 LookupResult::Filter F = OpLookup.makeFilter(); 8355 while (F.hasNext()) { 8356 NamedDecl *D = F.next(); 8357 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8358 if (Method->isCopyAssignmentOperator() || 8359 (!Copying && Method->isMoveAssignmentOperator())) 8360 continue; 8361 8362 F.erase(); 8363 } 8364 F.done(); 8365 } 8366 8367 // Suppress the protected check (C++ [class.protected]) for each of the 8368 // assignment operators we found. This strange dance is required when 8369 // we're assigning via a base classes's copy-assignment operator. To 8370 // ensure that we're getting the right base class subobject (without 8371 // ambiguities), we need to cast "this" to that subobject type; to 8372 // ensure that we don't go through the virtual call mechanism, we need 8373 // to qualify the operator= name with the base class (see below). However, 8374 // this means that if the base class has a protected copy assignment 8375 // operator, the protected member access check will fail. So, we 8376 // rewrite "protected" access to "public" access in this case, since we 8377 // know by construction that we're calling from a derived class. 8378 if (CopyingBaseSubobject) { 8379 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8380 L != LEnd; ++L) { 8381 if (L.getAccess() == AS_protected) 8382 L.setAccess(AS_public); 8383 } 8384 } 8385 8386 // Create the nested-name-specifier that will be used to qualify the 8387 // reference to operator=; this is required to suppress the virtual 8388 // call mechanism. 8389 CXXScopeSpec SS; 8390 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8391 SS.MakeTrivial(S.Context, 8392 NestedNameSpecifier::Create(S.Context, 0, false, 8393 CanonicalT), 8394 Loc); 8395 8396 // Create the reference to operator=. 8397 ExprResult OpEqualRef 8398 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8399 /*TemplateKWLoc=*/SourceLocation(), 8400 /*FirstQualifierInScope=*/0, 8401 OpLookup, 8402 /*TemplateArgs=*/0, 8403 /*SuppressQualifierCheck=*/true); 8404 if (OpEqualRef.isInvalid()) 8405 return StmtError(); 8406 8407 // Build the call to the assignment operator. 8408 8409 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8410 OpEqualRef.takeAs<Expr>(), 8411 Loc, &From, 1, Loc); 8412 if (Call.isInvalid()) 8413 return StmtError(); 8414 8415 // If we built a call to a trivial 'operator=' while copying an array, 8416 // bail out. We'll replace the whole shebang with a memcpy. 8417 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8418 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8419 return StmtResult((Stmt*)0); 8420 8421 // Convert to an expression-statement, and clean up any produced 8422 // temporaries. 8423 return S.ActOnExprStmt(Call); 8424 } 8425 8426 // - if the subobject is of scalar type, the built-in assignment 8427 // operator is used. 8428 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8429 if (!ArrayTy) { 8430 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8431 if (Assignment.isInvalid()) 8432 return StmtError(); 8433 return S.ActOnExprStmt(Assignment); 8434 } 8435 8436 // - if the subobject is an array, each element is assigned, in the 8437 // manner appropriate to the element type; 8438 8439 // Construct a loop over the array bounds, e.g., 8440 // 8441 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8442 // 8443 // that will copy each of the array elements. 8444 QualType SizeType = S.Context.getSizeType(); 8445 8446 // Create the iteration variable. 8447 IdentifierInfo *IterationVarName = 0; 8448 { 8449 SmallString<8> Str; 8450 llvm::raw_svector_ostream OS(Str); 8451 OS << "__i" << Depth; 8452 IterationVarName = &S.Context.Idents.get(OS.str()); 8453 } 8454 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8455 IterationVarName, SizeType, 8456 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8457 SC_None); 8458 8459 // Initialize the iteration variable to zero. 8460 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8461 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8462 8463 // Create a reference to the iteration variable; we'll use this several 8464 // times throughout. 8465 Expr *IterationVarRef 8466 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8467 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8468 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8469 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8470 8471 // Create the DeclStmt that holds the iteration variable. 8472 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8473 8474 // Subscript the "from" and "to" expressions with the iteration variable. 8475 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8476 IterationVarRefRVal, 8477 Loc)); 8478 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8479 IterationVarRefRVal, 8480 Loc)); 8481 if (!Copying) // Cast to rvalue 8482 From = CastForMoving(S, From); 8483 8484 // Build the copy/move for an individual element of the array. 8485 StmtResult Copy = 8486 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8487 To, From, CopyingBaseSubobject, 8488 Copying, Depth + 1); 8489 // Bail out if copying fails or if we determined that we should use memcpy. 8490 if (Copy.isInvalid() || !Copy.get()) 8491 return Copy; 8492 8493 // Create the comparison against the array bound. 8494 llvm::APInt Upper 8495 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8496 Expr *Comparison 8497 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8498 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8499 BO_NE, S.Context.BoolTy, 8500 VK_RValue, OK_Ordinary, Loc, false); 8501 8502 // Create the pre-increment of the iteration variable. 8503 Expr *Increment 8504 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8505 VK_LValue, OK_Ordinary, Loc); 8506 8507 // Construct the loop that copies all elements of this array. 8508 return S.ActOnForStmt(Loc, Loc, InitStmt, 8509 S.MakeFullExpr(Comparison), 8510 0, S.MakeFullDiscardedValueExpr(Increment), 8511 Loc, Copy.take()); 8512} 8513 8514static StmtResult 8515buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8516 Expr *To, Expr *From, 8517 bool CopyingBaseSubobject, bool Copying) { 8518 // Maybe we should use a memcpy? 8519 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8520 T.isTriviallyCopyableType(S.Context)) 8521 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8522 8523 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8524 CopyingBaseSubobject, 8525 Copying, 0)); 8526 8527 // If we ended up picking a trivial assignment operator for an array of a 8528 // non-trivially-copyable class type, just emit a memcpy. 8529 if (!Result.isInvalid() && !Result.get()) 8530 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8531 8532 return Result; 8533} 8534 8535Sema::ImplicitExceptionSpecification 8536Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8537 CXXRecordDecl *ClassDecl = MD->getParent(); 8538 8539 ImplicitExceptionSpecification ExceptSpec(*this); 8540 if (ClassDecl->isInvalidDecl()) 8541 return ExceptSpec; 8542 8543 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8544 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8545 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8546 8547 // C++ [except.spec]p14: 8548 // An implicitly declared special member function (Clause 12) shall have an 8549 // exception-specification. [...] 8550 8551 // It is unspecified whether or not an implicit copy assignment operator 8552 // attempts to deduplicate calls to assignment operators of virtual bases are 8553 // made. As such, this exception specification is effectively unspecified. 8554 // Based on a similar decision made for constness in C++0x, we're erring on 8555 // the side of assuming such calls to be made regardless of whether they 8556 // actually happen. 8557 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8558 BaseEnd = ClassDecl->bases_end(); 8559 Base != BaseEnd; ++Base) { 8560 if (Base->isVirtual()) 8561 continue; 8562 8563 CXXRecordDecl *BaseClassDecl 8564 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8565 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8566 ArgQuals, false, 0)) 8567 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8568 } 8569 8570 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8571 BaseEnd = ClassDecl->vbases_end(); 8572 Base != BaseEnd; ++Base) { 8573 CXXRecordDecl *BaseClassDecl 8574 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8575 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8576 ArgQuals, false, 0)) 8577 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8578 } 8579 8580 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8581 FieldEnd = ClassDecl->field_end(); 8582 Field != FieldEnd; 8583 ++Field) { 8584 QualType FieldType = Context.getBaseElementType(Field->getType()); 8585 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8586 if (CXXMethodDecl *CopyAssign = 8587 LookupCopyingAssignment(FieldClassDecl, 8588 ArgQuals | FieldType.getCVRQualifiers(), 8589 false, 0)) 8590 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8591 } 8592 } 8593 8594 return ExceptSpec; 8595} 8596 8597CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8598 // Note: The following rules are largely analoguous to the copy 8599 // constructor rules. Note that virtual bases are not taken into account 8600 // for determining the argument type of the operator. Note also that 8601 // operators taking an object instead of a reference are allowed. 8602 assert(ClassDecl->needsImplicitCopyAssignment()); 8603 8604 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8605 if (DSM.isAlreadyBeingDeclared()) 8606 return 0; 8607 8608 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8609 QualType RetType = Context.getLValueReferenceType(ArgType); 8610 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8611 ArgType = ArgType.withConst(); 8612 ArgType = Context.getLValueReferenceType(ArgType); 8613 8614 // An implicitly-declared copy assignment operator is an inline public 8615 // member of its class. 8616 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8617 SourceLocation ClassLoc = ClassDecl->getLocation(); 8618 DeclarationNameInfo NameInfo(Name, ClassLoc); 8619 CXXMethodDecl *CopyAssignment 8620 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8621 /*TInfo=*/0, 8622 /*StorageClass=*/SC_None, 8623 /*isInline=*/true, /*isConstexpr=*/false, 8624 SourceLocation()); 8625 CopyAssignment->setAccess(AS_public); 8626 CopyAssignment->setDefaulted(); 8627 CopyAssignment->setImplicit(); 8628 8629 // Build an exception specification pointing back at this member. 8630 FunctionProtoType::ExtProtoInfo EPI; 8631 EPI.ExceptionSpecType = EST_Unevaluated; 8632 EPI.ExceptionSpecDecl = CopyAssignment; 8633 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8634 8635 // Add the parameter to the operator. 8636 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8637 ClassLoc, ClassLoc, /*Id=*/0, 8638 ArgType, /*TInfo=*/0, 8639 SC_None, 0); 8640 CopyAssignment->setParams(FromParam); 8641 8642 AddOverriddenMethods(ClassDecl, CopyAssignment); 8643 8644 CopyAssignment->setTrivial( 8645 ClassDecl->needsOverloadResolutionForCopyAssignment() 8646 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8647 : ClassDecl->hasTrivialCopyAssignment()); 8648 8649 // C++0x [class.copy]p19: 8650 // .... If the class definition does not explicitly declare a copy 8651 // assignment operator, there is no user-declared move constructor, and 8652 // there is no user-declared move assignment operator, a copy assignment 8653 // operator is implicitly declared as defaulted. 8654 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8655 SetDeclDeleted(CopyAssignment, ClassLoc); 8656 8657 // Note that we have added this copy-assignment operator. 8658 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8659 8660 if (Scope *S = getScopeForContext(ClassDecl)) 8661 PushOnScopeChains(CopyAssignment, S, false); 8662 ClassDecl->addDecl(CopyAssignment); 8663 8664 return CopyAssignment; 8665} 8666 8667void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8668 CXXMethodDecl *CopyAssignOperator) { 8669 assert((CopyAssignOperator->isDefaulted() && 8670 CopyAssignOperator->isOverloadedOperator() && 8671 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8672 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8673 !CopyAssignOperator->isDeleted()) && 8674 "DefineImplicitCopyAssignment called for wrong function"); 8675 8676 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8677 8678 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8679 CopyAssignOperator->setInvalidDecl(); 8680 return; 8681 } 8682 8683 CopyAssignOperator->setUsed(); 8684 8685 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8686 DiagnosticErrorTrap Trap(Diags); 8687 8688 // C++0x [class.copy]p30: 8689 // The implicitly-defined or explicitly-defaulted copy assignment operator 8690 // for a non-union class X performs memberwise copy assignment of its 8691 // subobjects. The direct base classes of X are assigned first, in the 8692 // order of their declaration in the base-specifier-list, and then the 8693 // immediate non-static data members of X are assigned, in the order in 8694 // which they were declared in the class definition. 8695 8696 // The statements that form the synthesized function body. 8697 SmallVector<Stmt*, 8> Statements; 8698 8699 // The parameter for the "other" object, which we are copying from. 8700 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8701 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8702 QualType OtherRefType = Other->getType(); 8703 if (const LValueReferenceType *OtherRef 8704 = OtherRefType->getAs<LValueReferenceType>()) { 8705 OtherRefType = OtherRef->getPointeeType(); 8706 OtherQuals = OtherRefType.getQualifiers(); 8707 } 8708 8709 // Our location for everything implicitly-generated. 8710 SourceLocation Loc = CopyAssignOperator->getLocation(); 8711 8712 // Construct a reference to the "other" object. We'll be using this 8713 // throughout the generated ASTs. 8714 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8715 assert(OtherRef && "Reference to parameter cannot fail!"); 8716 8717 // Construct the "this" pointer. We'll be using this throughout the generated 8718 // ASTs. 8719 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8720 assert(This && "Reference to this cannot fail!"); 8721 8722 // Assign base classes. 8723 bool Invalid = false; 8724 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8725 E = ClassDecl->bases_end(); Base != E; ++Base) { 8726 // Form the assignment: 8727 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8728 QualType BaseType = Base->getType().getUnqualifiedType(); 8729 if (!BaseType->isRecordType()) { 8730 Invalid = true; 8731 continue; 8732 } 8733 8734 CXXCastPath BasePath; 8735 BasePath.push_back(Base); 8736 8737 // Construct the "from" expression, which is an implicit cast to the 8738 // appropriately-qualified base type. 8739 Expr *From = OtherRef; 8740 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8741 CK_UncheckedDerivedToBase, 8742 VK_LValue, &BasePath).take(); 8743 8744 // Dereference "this". 8745 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8746 8747 // Implicitly cast "this" to the appropriately-qualified base type. 8748 To = ImpCastExprToType(To.take(), 8749 Context.getCVRQualifiedType(BaseType, 8750 CopyAssignOperator->getTypeQualifiers()), 8751 CK_UncheckedDerivedToBase, 8752 VK_LValue, &BasePath); 8753 8754 // Build the copy. 8755 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8756 To.get(), From, 8757 /*CopyingBaseSubobject=*/true, 8758 /*Copying=*/true); 8759 if (Copy.isInvalid()) { 8760 Diag(CurrentLocation, diag::note_member_synthesized_at) 8761 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8762 CopyAssignOperator->setInvalidDecl(); 8763 return; 8764 } 8765 8766 // Success! Record the copy. 8767 Statements.push_back(Copy.takeAs<Expr>()); 8768 } 8769 8770 // Assign non-static members. 8771 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8772 FieldEnd = ClassDecl->field_end(); 8773 Field != FieldEnd; ++Field) { 8774 if (Field->isUnnamedBitfield()) 8775 continue; 8776 8777 // Check for members of reference type; we can't copy those. 8778 if (Field->getType()->isReferenceType()) { 8779 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8780 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8781 Diag(Field->getLocation(), diag::note_declared_at); 8782 Diag(CurrentLocation, diag::note_member_synthesized_at) 8783 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8784 Invalid = true; 8785 continue; 8786 } 8787 8788 // Check for members of const-qualified, non-class type. 8789 QualType BaseType = Context.getBaseElementType(Field->getType()); 8790 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8791 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8792 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8793 Diag(Field->getLocation(), diag::note_declared_at); 8794 Diag(CurrentLocation, diag::note_member_synthesized_at) 8795 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8796 Invalid = true; 8797 continue; 8798 } 8799 8800 // Suppress assigning zero-width bitfields. 8801 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8802 continue; 8803 8804 QualType FieldType = Field->getType().getNonReferenceType(); 8805 if (FieldType->isIncompleteArrayType()) { 8806 assert(ClassDecl->hasFlexibleArrayMember() && 8807 "Incomplete array type is not valid"); 8808 continue; 8809 } 8810 8811 // Build references to the field in the object we're copying from and to. 8812 CXXScopeSpec SS; // Intentionally empty 8813 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8814 LookupMemberName); 8815 MemberLookup.addDecl(*Field); 8816 MemberLookup.resolveKind(); 8817 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8818 Loc, /*IsArrow=*/false, 8819 SS, SourceLocation(), 0, 8820 MemberLookup, 0); 8821 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8822 Loc, /*IsArrow=*/true, 8823 SS, SourceLocation(), 0, 8824 MemberLookup, 0); 8825 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8826 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8827 8828 // Build the copy of this field. 8829 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8830 To.get(), From.get(), 8831 /*CopyingBaseSubobject=*/false, 8832 /*Copying=*/true); 8833 if (Copy.isInvalid()) { 8834 Diag(CurrentLocation, diag::note_member_synthesized_at) 8835 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8836 CopyAssignOperator->setInvalidDecl(); 8837 return; 8838 } 8839 8840 // Success! Record the copy. 8841 Statements.push_back(Copy.takeAs<Stmt>()); 8842 } 8843 8844 if (!Invalid) { 8845 // Add a "return *this;" 8846 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8847 8848 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8849 if (Return.isInvalid()) 8850 Invalid = true; 8851 else { 8852 Statements.push_back(Return.takeAs<Stmt>()); 8853 8854 if (Trap.hasErrorOccurred()) { 8855 Diag(CurrentLocation, diag::note_member_synthesized_at) 8856 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8857 Invalid = true; 8858 } 8859 } 8860 } 8861 8862 if (Invalid) { 8863 CopyAssignOperator->setInvalidDecl(); 8864 return; 8865 } 8866 8867 StmtResult Body; 8868 { 8869 CompoundScopeRAII CompoundScope(*this); 8870 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8871 /*isStmtExpr=*/false); 8872 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8873 } 8874 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8875 8876 if (ASTMutationListener *L = getASTMutationListener()) { 8877 L->CompletedImplicitDefinition(CopyAssignOperator); 8878 } 8879} 8880 8881Sema::ImplicitExceptionSpecification 8882Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8883 CXXRecordDecl *ClassDecl = MD->getParent(); 8884 8885 ImplicitExceptionSpecification ExceptSpec(*this); 8886 if (ClassDecl->isInvalidDecl()) 8887 return ExceptSpec; 8888 8889 // C++0x [except.spec]p14: 8890 // An implicitly declared special member function (Clause 12) shall have an 8891 // exception-specification. [...] 8892 8893 // It is unspecified whether or not an implicit move assignment operator 8894 // attempts to deduplicate calls to assignment operators of virtual bases are 8895 // made. As such, this exception specification is effectively unspecified. 8896 // Based on a similar decision made for constness in C++0x, we're erring on 8897 // the side of assuming such calls to be made regardless of whether they 8898 // actually happen. 8899 // Note that a move constructor is not implicitly declared when there are 8900 // virtual bases, but it can still be user-declared and explicitly defaulted. 8901 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8902 BaseEnd = ClassDecl->bases_end(); 8903 Base != BaseEnd; ++Base) { 8904 if (Base->isVirtual()) 8905 continue; 8906 8907 CXXRecordDecl *BaseClassDecl 8908 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8909 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8910 0, false, 0)) 8911 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8912 } 8913 8914 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8915 BaseEnd = ClassDecl->vbases_end(); 8916 Base != BaseEnd; ++Base) { 8917 CXXRecordDecl *BaseClassDecl 8918 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8919 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8920 0, false, 0)) 8921 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8922 } 8923 8924 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8925 FieldEnd = ClassDecl->field_end(); 8926 Field != FieldEnd; 8927 ++Field) { 8928 QualType FieldType = Context.getBaseElementType(Field->getType()); 8929 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8930 if (CXXMethodDecl *MoveAssign = 8931 LookupMovingAssignment(FieldClassDecl, 8932 FieldType.getCVRQualifiers(), 8933 false, 0)) 8934 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8935 } 8936 } 8937 8938 return ExceptSpec; 8939} 8940 8941/// Determine whether the class type has any direct or indirect virtual base 8942/// classes which have a non-trivial move assignment operator. 8943static bool 8944hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8945 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8946 BaseEnd = ClassDecl->vbases_end(); 8947 Base != BaseEnd; ++Base) { 8948 CXXRecordDecl *BaseClass = 8949 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8950 8951 // Try to declare the move assignment. If it would be deleted, then the 8952 // class does not have a non-trivial move assignment. 8953 if (BaseClass->needsImplicitMoveAssignment()) 8954 S.DeclareImplicitMoveAssignment(BaseClass); 8955 8956 if (BaseClass->hasNonTrivialMoveAssignment()) 8957 return true; 8958 } 8959 8960 return false; 8961} 8962 8963/// Determine whether the given type either has a move constructor or is 8964/// trivially copyable. 8965static bool 8966hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8967 Type = S.Context.getBaseElementType(Type); 8968 8969 // FIXME: Technically, non-trivially-copyable non-class types, such as 8970 // reference types, are supposed to return false here, but that appears 8971 // to be a standard defect. 8972 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8973 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8974 return true; 8975 8976 if (Type.isTriviallyCopyableType(S.Context)) 8977 return true; 8978 8979 if (IsConstructor) { 8980 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 8981 // give the right answer. 8982 if (ClassDecl->needsImplicitMoveConstructor()) 8983 S.DeclareImplicitMoveConstructor(ClassDecl); 8984 return ClassDecl->hasMoveConstructor(); 8985 } 8986 8987 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 8988 // give the right answer. 8989 if (ClassDecl->needsImplicitMoveAssignment()) 8990 S.DeclareImplicitMoveAssignment(ClassDecl); 8991 return ClassDecl->hasMoveAssignment(); 8992} 8993 8994/// Determine whether all non-static data members and direct or virtual bases 8995/// of class \p ClassDecl have either a move operation, or are trivially 8996/// copyable. 8997static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8998 bool IsConstructor) { 8999 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9000 BaseEnd = ClassDecl->bases_end(); 9001 Base != BaseEnd; ++Base) { 9002 if (Base->isVirtual()) 9003 continue; 9004 9005 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9006 return false; 9007 } 9008 9009 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9010 BaseEnd = ClassDecl->vbases_end(); 9011 Base != BaseEnd; ++Base) { 9012 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 9013 return false; 9014 } 9015 9016 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9017 FieldEnd = ClassDecl->field_end(); 9018 Field != FieldEnd; ++Field) { 9019 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 9020 return false; 9021 } 9022 9023 return true; 9024} 9025 9026CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 9027 // C++11 [class.copy]p20: 9028 // If the definition of a class X does not explicitly declare a move 9029 // assignment operator, one will be implicitly declared as defaulted 9030 // if and only if: 9031 // 9032 // - [first 4 bullets] 9033 assert(ClassDecl->needsImplicitMoveAssignment()); 9034 9035 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 9036 if (DSM.isAlreadyBeingDeclared()) 9037 return 0; 9038 9039 // [Checked after we build the declaration] 9040 // - the move assignment operator would not be implicitly defined as 9041 // deleted, 9042 9043 // [DR1402]: 9044 // - X has no direct or indirect virtual base class with a non-trivial 9045 // move assignment operator, and 9046 // - each of X's non-static data members and direct or virtual base classes 9047 // has a type that either has a move assignment operator or is trivially 9048 // copyable. 9049 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 9050 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 9051 ClassDecl->setFailedImplicitMoveAssignment(); 9052 return 0; 9053 } 9054 9055 // Note: The following rules are largely analoguous to the move 9056 // constructor rules. 9057 9058 QualType ArgType = Context.getTypeDeclType(ClassDecl); 9059 QualType RetType = Context.getLValueReferenceType(ArgType); 9060 ArgType = Context.getRValueReferenceType(ArgType); 9061 9062 // An implicitly-declared move assignment operator is an inline public 9063 // member of its class. 9064 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 9065 SourceLocation ClassLoc = ClassDecl->getLocation(); 9066 DeclarationNameInfo NameInfo(Name, ClassLoc); 9067 CXXMethodDecl *MoveAssignment 9068 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 9069 /*TInfo=*/0, 9070 /*StorageClass=*/SC_None, 9071 /*isInline=*/true, 9072 /*isConstexpr=*/false, 9073 SourceLocation()); 9074 MoveAssignment->setAccess(AS_public); 9075 MoveAssignment->setDefaulted(); 9076 MoveAssignment->setImplicit(); 9077 9078 // Build an exception specification pointing back at this member. 9079 FunctionProtoType::ExtProtoInfo EPI; 9080 EPI.ExceptionSpecType = EST_Unevaluated; 9081 EPI.ExceptionSpecDecl = MoveAssignment; 9082 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 9083 9084 // Add the parameter to the operator. 9085 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 9086 ClassLoc, ClassLoc, /*Id=*/0, 9087 ArgType, /*TInfo=*/0, 9088 SC_None, 0); 9089 MoveAssignment->setParams(FromParam); 9090 9091 AddOverriddenMethods(ClassDecl, MoveAssignment); 9092 9093 MoveAssignment->setTrivial( 9094 ClassDecl->needsOverloadResolutionForMoveAssignment() 9095 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 9096 : ClassDecl->hasTrivialMoveAssignment()); 9097 9098 // C++0x [class.copy]p9: 9099 // If the definition of a class X does not explicitly declare a move 9100 // assignment operator, one will be implicitly declared as defaulted if and 9101 // only if: 9102 // [...] 9103 // - the move assignment operator would not be implicitly defined as 9104 // deleted. 9105 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 9106 // Cache this result so that we don't try to generate this over and over 9107 // on every lookup, leaking memory and wasting time. 9108 ClassDecl->setFailedImplicitMoveAssignment(); 9109 return 0; 9110 } 9111 9112 // Note that we have added this copy-assignment operator. 9113 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 9114 9115 if (Scope *S = getScopeForContext(ClassDecl)) 9116 PushOnScopeChains(MoveAssignment, S, false); 9117 ClassDecl->addDecl(MoveAssignment); 9118 9119 return MoveAssignment; 9120} 9121 9122void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 9123 CXXMethodDecl *MoveAssignOperator) { 9124 assert((MoveAssignOperator->isDefaulted() && 9125 MoveAssignOperator->isOverloadedOperator() && 9126 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 9127 !MoveAssignOperator->doesThisDeclarationHaveABody() && 9128 !MoveAssignOperator->isDeleted()) && 9129 "DefineImplicitMoveAssignment called for wrong function"); 9130 9131 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 9132 9133 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 9134 MoveAssignOperator->setInvalidDecl(); 9135 return; 9136 } 9137 9138 MoveAssignOperator->setUsed(); 9139 9140 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 9141 DiagnosticErrorTrap Trap(Diags); 9142 9143 // C++0x [class.copy]p28: 9144 // The implicitly-defined or move assignment operator for a non-union class 9145 // X performs memberwise move assignment of its subobjects. The direct base 9146 // classes of X are assigned first, in the order of their declaration in the 9147 // base-specifier-list, and then the immediate non-static data members of X 9148 // are assigned, in the order in which they were declared in the class 9149 // definition. 9150 9151 // The statements that form the synthesized function body. 9152 SmallVector<Stmt*, 8> Statements; 9153 9154 // The parameter for the "other" object, which we are move from. 9155 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 9156 QualType OtherRefType = Other->getType()-> 9157 getAs<RValueReferenceType>()->getPointeeType(); 9158 assert(OtherRefType.getQualifiers() == 0 && 9159 "Bad argument type of defaulted move assignment"); 9160 9161 // Our location for everything implicitly-generated. 9162 SourceLocation Loc = MoveAssignOperator->getLocation(); 9163 9164 // Construct a reference to the "other" object. We'll be using this 9165 // throughout the generated ASTs. 9166 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 9167 assert(OtherRef && "Reference to parameter cannot fail!"); 9168 // Cast to rvalue. 9169 OtherRef = CastForMoving(*this, OtherRef); 9170 9171 // Construct the "this" pointer. We'll be using this throughout the generated 9172 // ASTs. 9173 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 9174 assert(This && "Reference to this cannot fail!"); 9175 9176 // Assign base classes. 9177 bool Invalid = false; 9178 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9179 E = ClassDecl->bases_end(); Base != E; ++Base) { 9180 // Form the assignment: 9181 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 9182 QualType BaseType = Base->getType().getUnqualifiedType(); 9183 if (!BaseType->isRecordType()) { 9184 Invalid = true; 9185 continue; 9186 } 9187 9188 CXXCastPath BasePath; 9189 BasePath.push_back(Base); 9190 9191 // Construct the "from" expression, which is an implicit cast to the 9192 // appropriately-qualified base type. 9193 Expr *From = OtherRef; 9194 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9195 VK_XValue, &BasePath).take(); 9196 9197 // Dereference "this". 9198 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9199 9200 // Implicitly cast "this" to the appropriately-qualified base type. 9201 To = ImpCastExprToType(To.take(), 9202 Context.getCVRQualifiedType(BaseType, 9203 MoveAssignOperator->getTypeQualifiers()), 9204 CK_UncheckedDerivedToBase, 9205 VK_LValue, &BasePath); 9206 9207 // Build the move. 9208 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9209 To.get(), From, 9210 /*CopyingBaseSubobject=*/true, 9211 /*Copying=*/false); 9212 if (Move.isInvalid()) { 9213 Diag(CurrentLocation, diag::note_member_synthesized_at) 9214 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9215 MoveAssignOperator->setInvalidDecl(); 9216 return; 9217 } 9218 9219 // Success! Record the move. 9220 Statements.push_back(Move.takeAs<Expr>()); 9221 } 9222 9223 // Assign non-static members. 9224 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9225 FieldEnd = ClassDecl->field_end(); 9226 Field != FieldEnd; ++Field) { 9227 if (Field->isUnnamedBitfield()) 9228 continue; 9229 9230 // Check for members of reference type; we can't move those. 9231 if (Field->getType()->isReferenceType()) { 9232 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9233 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9234 Diag(Field->getLocation(), diag::note_declared_at); 9235 Diag(CurrentLocation, diag::note_member_synthesized_at) 9236 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9237 Invalid = true; 9238 continue; 9239 } 9240 9241 // Check for members of const-qualified, non-class type. 9242 QualType BaseType = Context.getBaseElementType(Field->getType()); 9243 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9244 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9245 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9246 Diag(Field->getLocation(), diag::note_declared_at); 9247 Diag(CurrentLocation, diag::note_member_synthesized_at) 9248 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9249 Invalid = true; 9250 continue; 9251 } 9252 9253 // Suppress assigning zero-width bitfields. 9254 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9255 continue; 9256 9257 QualType FieldType = Field->getType().getNonReferenceType(); 9258 if (FieldType->isIncompleteArrayType()) { 9259 assert(ClassDecl->hasFlexibleArrayMember() && 9260 "Incomplete array type is not valid"); 9261 continue; 9262 } 9263 9264 // Build references to the field in the object we're copying from and to. 9265 CXXScopeSpec SS; // Intentionally empty 9266 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9267 LookupMemberName); 9268 MemberLookup.addDecl(*Field); 9269 MemberLookup.resolveKind(); 9270 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9271 Loc, /*IsArrow=*/false, 9272 SS, SourceLocation(), 0, 9273 MemberLookup, 0); 9274 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9275 Loc, /*IsArrow=*/true, 9276 SS, SourceLocation(), 0, 9277 MemberLookup, 0); 9278 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9279 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9280 9281 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9282 "Member reference with rvalue base must be rvalue except for reference " 9283 "members, which aren't allowed for move assignment."); 9284 9285 // Build the move of this field. 9286 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9287 To.get(), From.get(), 9288 /*CopyingBaseSubobject=*/false, 9289 /*Copying=*/false); 9290 if (Move.isInvalid()) { 9291 Diag(CurrentLocation, diag::note_member_synthesized_at) 9292 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9293 MoveAssignOperator->setInvalidDecl(); 9294 return; 9295 } 9296 9297 // Success! Record the copy. 9298 Statements.push_back(Move.takeAs<Stmt>()); 9299 } 9300 9301 if (!Invalid) { 9302 // Add a "return *this;" 9303 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9304 9305 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9306 if (Return.isInvalid()) 9307 Invalid = true; 9308 else { 9309 Statements.push_back(Return.takeAs<Stmt>()); 9310 9311 if (Trap.hasErrorOccurred()) { 9312 Diag(CurrentLocation, diag::note_member_synthesized_at) 9313 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9314 Invalid = true; 9315 } 9316 } 9317 } 9318 9319 if (Invalid) { 9320 MoveAssignOperator->setInvalidDecl(); 9321 return; 9322 } 9323 9324 StmtResult Body; 9325 { 9326 CompoundScopeRAII CompoundScope(*this); 9327 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9328 /*isStmtExpr=*/false); 9329 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9330 } 9331 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9332 9333 if (ASTMutationListener *L = getASTMutationListener()) { 9334 L->CompletedImplicitDefinition(MoveAssignOperator); 9335 } 9336} 9337 9338Sema::ImplicitExceptionSpecification 9339Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9340 CXXRecordDecl *ClassDecl = MD->getParent(); 9341 9342 ImplicitExceptionSpecification ExceptSpec(*this); 9343 if (ClassDecl->isInvalidDecl()) 9344 return ExceptSpec; 9345 9346 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9347 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9348 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9349 9350 // C++ [except.spec]p14: 9351 // An implicitly declared special member function (Clause 12) shall have an 9352 // exception-specification. [...] 9353 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9354 BaseEnd = ClassDecl->bases_end(); 9355 Base != BaseEnd; 9356 ++Base) { 9357 // Virtual bases are handled below. 9358 if (Base->isVirtual()) 9359 continue; 9360 9361 CXXRecordDecl *BaseClassDecl 9362 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9363 if (CXXConstructorDecl *CopyConstructor = 9364 LookupCopyingConstructor(BaseClassDecl, Quals)) 9365 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9366 } 9367 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9368 BaseEnd = ClassDecl->vbases_end(); 9369 Base != BaseEnd; 9370 ++Base) { 9371 CXXRecordDecl *BaseClassDecl 9372 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9373 if (CXXConstructorDecl *CopyConstructor = 9374 LookupCopyingConstructor(BaseClassDecl, Quals)) 9375 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9376 } 9377 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9378 FieldEnd = ClassDecl->field_end(); 9379 Field != FieldEnd; 9380 ++Field) { 9381 QualType FieldType = Context.getBaseElementType(Field->getType()); 9382 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9383 if (CXXConstructorDecl *CopyConstructor = 9384 LookupCopyingConstructor(FieldClassDecl, 9385 Quals | FieldType.getCVRQualifiers())) 9386 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9387 } 9388 } 9389 9390 return ExceptSpec; 9391} 9392 9393CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9394 CXXRecordDecl *ClassDecl) { 9395 // C++ [class.copy]p4: 9396 // If the class definition does not explicitly declare a copy 9397 // constructor, one is declared implicitly. 9398 assert(ClassDecl->needsImplicitCopyConstructor()); 9399 9400 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9401 if (DSM.isAlreadyBeingDeclared()) 9402 return 0; 9403 9404 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9405 QualType ArgType = ClassType; 9406 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9407 if (Const) 9408 ArgType = ArgType.withConst(); 9409 ArgType = Context.getLValueReferenceType(ArgType); 9410 9411 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9412 CXXCopyConstructor, 9413 Const); 9414 9415 DeclarationName Name 9416 = Context.DeclarationNames.getCXXConstructorName( 9417 Context.getCanonicalType(ClassType)); 9418 SourceLocation ClassLoc = ClassDecl->getLocation(); 9419 DeclarationNameInfo NameInfo(Name, ClassLoc); 9420 9421 // An implicitly-declared copy constructor is an inline public 9422 // member of its class. 9423 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9424 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9425 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9426 Constexpr); 9427 CopyConstructor->setAccess(AS_public); 9428 CopyConstructor->setDefaulted(); 9429 9430 // Build an exception specification pointing back at this member. 9431 FunctionProtoType::ExtProtoInfo EPI; 9432 EPI.ExceptionSpecType = EST_Unevaluated; 9433 EPI.ExceptionSpecDecl = CopyConstructor; 9434 CopyConstructor->setType( 9435 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9436 9437 // Add the parameter to the constructor. 9438 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9439 ClassLoc, ClassLoc, 9440 /*IdentifierInfo=*/0, 9441 ArgType, /*TInfo=*/0, 9442 SC_None, 0); 9443 CopyConstructor->setParams(FromParam); 9444 9445 CopyConstructor->setTrivial( 9446 ClassDecl->needsOverloadResolutionForCopyConstructor() 9447 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9448 : ClassDecl->hasTrivialCopyConstructor()); 9449 9450 // C++11 [class.copy]p8: 9451 // ... If the class definition does not explicitly declare a copy 9452 // constructor, there is no user-declared move constructor, and there is no 9453 // user-declared move assignment operator, a copy constructor is implicitly 9454 // declared as defaulted. 9455 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9456 SetDeclDeleted(CopyConstructor, ClassLoc); 9457 9458 // Note that we have declared this constructor. 9459 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9460 9461 if (Scope *S = getScopeForContext(ClassDecl)) 9462 PushOnScopeChains(CopyConstructor, S, false); 9463 ClassDecl->addDecl(CopyConstructor); 9464 9465 return CopyConstructor; 9466} 9467 9468void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9469 CXXConstructorDecl *CopyConstructor) { 9470 assert((CopyConstructor->isDefaulted() && 9471 CopyConstructor->isCopyConstructor() && 9472 !CopyConstructor->doesThisDeclarationHaveABody() && 9473 !CopyConstructor->isDeleted()) && 9474 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9475 9476 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9477 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9478 9479 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9480 DiagnosticErrorTrap Trap(Diags); 9481 9482 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9483 Trap.hasErrorOccurred()) { 9484 Diag(CurrentLocation, diag::note_member_synthesized_at) 9485 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9486 CopyConstructor->setInvalidDecl(); 9487 } else { 9488 Sema::CompoundScopeRAII CompoundScope(*this); 9489 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9490 CopyConstructor->getLocation(), 9491 MultiStmtArg(), 9492 /*isStmtExpr=*/false) 9493 .takeAs<Stmt>()); 9494 CopyConstructor->setImplicitlyDefined(true); 9495 } 9496 9497 CopyConstructor->setUsed(); 9498 if (ASTMutationListener *L = getASTMutationListener()) { 9499 L->CompletedImplicitDefinition(CopyConstructor); 9500 } 9501} 9502 9503Sema::ImplicitExceptionSpecification 9504Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9505 CXXRecordDecl *ClassDecl = MD->getParent(); 9506 9507 // C++ [except.spec]p14: 9508 // An implicitly declared special member function (Clause 12) shall have an 9509 // exception-specification. [...] 9510 ImplicitExceptionSpecification ExceptSpec(*this); 9511 if (ClassDecl->isInvalidDecl()) 9512 return ExceptSpec; 9513 9514 // Direct base-class constructors. 9515 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9516 BEnd = ClassDecl->bases_end(); 9517 B != BEnd; ++B) { 9518 if (B->isVirtual()) // Handled below. 9519 continue; 9520 9521 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9522 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9523 CXXConstructorDecl *Constructor = 9524 LookupMovingConstructor(BaseClassDecl, 0); 9525 // If this is a deleted function, add it anyway. This might be conformant 9526 // with the standard. This might not. I'm not sure. It might not matter. 9527 if (Constructor) 9528 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9529 } 9530 } 9531 9532 // Virtual base-class constructors. 9533 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9534 BEnd = ClassDecl->vbases_end(); 9535 B != BEnd; ++B) { 9536 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9537 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9538 CXXConstructorDecl *Constructor = 9539 LookupMovingConstructor(BaseClassDecl, 0); 9540 // If this is a deleted function, add it anyway. This might be conformant 9541 // with the standard. This might not. I'm not sure. It might not matter. 9542 if (Constructor) 9543 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9544 } 9545 } 9546 9547 // Field constructors. 9548 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9549 FEnd = ClassDecl->field_end(); 9550 F != FEnd; ++F) { 9551 QualType FieldType = Context.getBaseElementType(F->getType()); 9552 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9553 CXXConstructorDecl *Constructor = 9554 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9555 // If this is a deleted function, add it anyway. This might be conformant 9556 // with the standard. This might not. I'm not sure. It might not matter. 9557 // In particular, the problem is that this function never gets called. It 9558 // might just be ill-formed because this function attempts to refer to 9559 // a deleted function here. 9560 if (Constructor) 9561 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9562 } 9563 } 9564 9565 return ExceptSpec; 9566} 9567 9568CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9569 CXXRecordDecl *ClassDecl) { 9570 // C++11 [class.copy]p9: 9571 // If the definition of a class X does not explicitly declare a move 9572 // constructor, one will be implicitly declared as defaulted if and only if: 9573 // 9574 // - [first 4 bullets] 9575 assert(ClassDecl->needsImplicitMoveConstructor()); 9576 9577 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9578 if (DSM.isAlreadyBeingDeclared()) 9579 return 0; 9580 9581 // [Checked after we build the declaration] 9582 // - the move assignment operator would not be implicitly defined as 9583 // deleted, 9584 9585 // [DR1402]: 9586 // - each of X's non-static data members and direct or virtual base classes 9587 // has a type that either has a move constructor or is trivially copyable. 9588 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9589 ClassDecl->setFailedImplicitMoveConstructor(); 9590 return 0; 9591 } 9592 9593 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9594 QualType ArgType = Context.getRValueReferenceType(ClassType); 9595 9596 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9597 CXXMoveConstructor, 9598 false); 9599 9600 DeclarationName Name 9601 = Context.DeclarationNames.getCXXConstructorName( 9602 Context.getCanonicalType(ClassType)); 9603 SourceLocation ClassLoc = ClassDecl->getLocation(); 9604 DeclarationNameInfo NameInfo(Name, ClassLoc); 9605 9606 // C++0x [class.copy]p11: 9607 // An implicitly-declared copy/move constructor is an inline public 9608 // member of its class. 9609 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9610 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9611 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9612 Constexpr); 9613 MoveConstructor->setAccess(AS_public); 9614 MoveConstructor->setDefaulted(); 9615 9616 // Build an exception specification pointing back at this member. 9617 FunctionProtoType::ExtProtoInfo EPI; 9618 EPI.ExceptionSpecType = EST_Unevaluated; 9619 EPI.ExceptionSpecDecl = MoveConstructor; 9620 MoveConstructor->setType( 9621 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9622 9623 // Add the parameter to the constructor. 9624 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9625 ClassLoc, ClassLoc, 9626 /*IdentifierInfo=*/0, 9627 ArgType, /*TInfo=*/0, 9628 SC_None, 0); 9629 MoveConstructor->setParams(FromParam); 9630 9631 MoveConstructor->setTrivial( 9632 ClassDecl->needsOverloadResolutionForMoveConstructor() 9633 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9634 : ClassDecl->hasTrivialMoveConstructor()); 9635 9636 // C++0x [class.copy]p9: 9637 // If the definition of a class X does not explicitly declare a move 9638 // constructor, one will be implicitly declared as defaulted if and only if: 9639 // [...] 9640 // - the move constructor would not be implicitly defined as deleted. 9641 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9642 // Cache this result so that we don't try to generate this over and over 9643 // on every lookup, leaking memory and wasting time. 9644 ClassDecl->setFailedImplicitMoveConstructor(); 9645 return 0; 9646 } 9647 9648 // Note that we have declared this constructor. 9649 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9650 9651 if (Scope *S = getScopeForContext(ClassDecl)) 9652 PushOnScopeChains(MoveConstructor, S, false); 9653 ClassDecl->addDecl(MoveConstructor); 9654 9655 return MoveConstructor; 9656} 9657 9658void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9659 CXXConstructorDecl *MoveConstructor) { 9660 assert((MoveConstructor->isDefaulted() && 9661 MoveConstructor->isMoveConstructor() && 9662 !MoveConstructor->doesThisDeclarationHaveABody() && 9663 !MoveConstructor->isDeleted()) && 9664 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9665 9666 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9667 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9668 9669 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9670 DiagnosticErrorTrap Trap(Diags); 9671 9672 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9673 Trap.hasErrorOccurred()) { 9674 Diag(CurrentLocation, diag::note_member_synthesized_at) 9675 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9676 MoveConstructor->setInvalidDecl(); 9677 } else { 9678 Sema::CompoundScopeRAII CompoundScope(*this); 9679 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9680 MoveConstructor->getLocation(), 9681 MultiStmtArg(), 9682 /*isStmtExpr=*/false) 9683 .takeAs<Stmt>()); 9684 MoveConstructor->setImplicitlyDefined(true); 9685 } 9686 9687 MoveConstructor->setUsed(); 9688 9689 if (ASTMutationListener *L = getASTMutationListener()) { 9690 L->CompletedImplicitDefinition(MoveConstructor); 9691 } 9692} 9693 9694bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9695 return FD->isDeleted() && 9696 (FD->isDefaulted() || FD->isImplicit()) && 9697 isa<CXXMethodDecl>(FD); 9698} 9699 9700/// \brief Mark the call operator of the given lambda closure type as "used". 9701static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9702 CXXMethodDecl *CallOperator 9703 = cast<CXXMethodDecl>( 9704 Lambda->lookup( 9705 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9706 CallOperator->setReferenced(); 9707 CallOperator->setUsed(); 9708} 9709 9710void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9711 SourceLocation CurrentLocation, 9712 CXXConversionDecl *Conv) 9713{ 9714 CXXRecordDecl *Lambda = Conv->getParent(); 9715 9716 // Make sure that the lambda call operator is marked used. 9717 markLambdaCallOperatorUsed(*this, Lambda); 9718 9719 Conv->setUsed(); 9720 9721 SynthesizedFunctionScope Scope(*this, Conv); 9722 DiagnosticErrorTrap Trap(Diags); 9723 9724 // Return the address of the __invoke function. 9725 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9726 CXXMethodDecl *Invoke 9727 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9728 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9729 VK_LValue, Conv->getLocation()).take(); 9730 assert(FunctionRef && "Can't refer to __invoke function?"); 9731 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9732 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9733 Conv->getLocation(), 9734 Conv->getLocation())); 9735 9736 // Fill in the __invoke function with a dummy implementation. IR generation 9737 // will fill in the actual details. 9738 Invoke->setUsed(); 9739 Invoke->setReferenced(); 9740 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9741 9742 if (ASTMutationListener *L = getASTMutationListener()) { 9743 L->CompletedImplicitDefinition(Conv); 9744 L->CompletedImplicitDefinition(Invoke); 9745 } 9746} 9747 9748void Sema::DefineImplicitLambdaToBlockPointerConversion( 9749 SourceLocation CurrentLocation, 9750 CXXConversionDecl *Conv) 9751{ 9752 Conv->setUsed(); 9753 9754 SynthesizedFunctionScope Scope(*this, Conv); 9755 DiagnosticErrorTrap Trap(Diags); 9756 9757 // Copy-initialize the lambda object as needed to capture it. 9758 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9759 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9760 9761 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9762 Conv->getLocation(), 9763 Conv, DerefThis); 9764 9765 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9766 // behavior. Note that only the general conversion function does this 9767 // (since it's unusable otherwise); in the case where we inline the 9768 // block literal, it has block literal lifetime semantics. 9769 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9770 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9771 CK_CopyAndAutoreleaseBlockObject, 9772 BuildBlock.get(), 0, VK_RValue); 9773 9774 if (BuildBlock.isInvalid()) { 9775 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9776 Conv->setInvalidDecl(); 9777 return; 9778 } 9779 9780 // Create the return statement that returns the block from the conversion 9781 // function. 9782 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9783 if (Return.isInvalid()) { 9784 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9785 Conv->setInvalidDecl(); 9786 return; 9787 } 9788 9789 // Set the body of the conversion function. 9790 Stmt *ReturnS = Return.take(); 9791 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9792 Conv->getLocation(), 9793 Conv->getLocation())); 9794 9795 // We're done; notify the mutation listener, if any. 9796 if (ASTMutationListener *L = getASTMutationListener()) { 9797 L->CompletedImplicitDefinition(Conv); 9798 } 9799} 9800 9801/// \brief Determine whether the given list arguments contains exactly one 9802/// "real" (non-default) argument. 9803static bool hasOneRealArgument(MultiExprArg Args) { 9804 switch (Args.size()) { 9805 case 0: 9806 return false; 9807 9808 default: 9809 if (!Args[1]->isDefaultArgument()) 9810 return false; 9811 9812 // fall through 9813 case 1: 9814 return !Args[0]->isDefaultArgument(); 9815 } 9816 9817 return false; 9818} 9819 9820ExprResult 9821Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9822 CXXConstructorDecl *Constructor, 9823 MultiExprArg ExprArgs, 9824 bool HadMultipleCandidates, 9825 bool IsListInitialization, 9826 bool RequiresZeroInit, 9827 unsigned ConstructKind, 9828 SourceRange ParenRange) { 9829 bool Elidable = false; 9830 9831 // C++0x [class.copy]p34: 9832 // When certain criteria are met, an implementation is allowed to 9833 // omit the copy/move construction of a class object, even if the 9834 // copy/move constructor and/or destructor for the object have 9835 // side effects. [...] 9836 // - when a temporary class object that has not been bound to a 9837 // reference (12.2) would be copied/moved to a class object 9838 // with the same cv-unqualified type, the copy/move operation 9839 // can be omitted by constructing the temporary object 9840 // directly into the target of the omitted copy/move 9841 if (ConstructKind == CXXConstructExpr::CK_Complete && 9842 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9843 Expr *SubExpr = ExprArgs[0]; 9844 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9845 } 9846 9847 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9848 Elidable, ExprArgs, HadMultipleCandidates, 9849 IsListInitialization, RequiresZeroInit, 9850 ConstructKind, ParenRange); 9851} 9852 9853/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9854/// including handling of its default argument expressions. 9855ExprResult 9856Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9857 CXXConstructorDecl *Constructor, bool Elidable, 9858 MultiExprArg ExprArgs, 9859 bool HadMultipleCandidates, 9860 bool IsListInitialization, 9861 bool RequiresZeroInit, 9862 unsigned ConstructKind, 9863 SourceRange ParenRange) { 9864 MarkFunctionReferenced(ConstructLoc, Constructor); 9865 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9866 Constructor, Elidable, ExprArgs, 9867 HadMultipleCandidates, 9868 IsListInitialization, RequiresZeroInit, 9869 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9870 ParenRange)); 9871} 9872 9873void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9874 if (VD->isInvalidDecl()) return; 9875 9876 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9877 if (ClassDecl->isInvalidDecl()) return; 9878 if (ClassDecl->hasIrrelevantDestructor()) return; 9879 if (ClassDecl->isDependentContext()) return; 9880 9881 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9882 MarkFunctionReferenced(VD->getLocation(), Destructor); 9883 CheckDestructorAccess(VD->getLocation(), Destructor, 9884 PDiag(diag::err_access_dtor_var) 9885 << VD->getDeclName() 9886 << VD->getType()); 9887 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9888 9889 if (!VD->hasGlobalStorage()) return; 9890 9891 // Emit warning for non-trivial dtor in global scope (a real global, 9892 // class-static, function-static). 9893 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9894 9895 // TODO: this should be re-enabled for static locals by !CXAAtExit 9896 if (!VD->isStaticLocal()) 9897 Diag(VD->getLocation(), diag::warn_global_destructor); 9898} 9899 9900/// \brief Given a constructor and the set of arguments provided for the 9901/// constructor, convert the arguments and add any required default arguments 9902/// to form a proper call to this constructor. 9903/// 9904/// \returns true if an error occurred, false otherwise. 9905bool 9906Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9907 MultiExprArg ArgsPtr, 9908 SourceLocation Loc, 9909 SmallVectorImpl<Expr*> &ConvertedArgs, 9910 bool AllowExplicit, 9911 bool IsListInitialization) { 9912 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9913 unsigned NumArgs = ArgsPtr.size(); 9914 Expr **Args = ArgsPtr.data(); 9915 9916 const FunctionProtoType *Proto 9917 = Constructor->getType()->getAs<FunctionProtoType>(); 9918 assert(Proto && "Constructor without a prototype?"); 9919 unsigned NumArgsInProto = Proto->getNumArgs(); 9920 9921 // If too few arguments are available, we'll fill in the rest with defaults. 9922 if (NumArgs < NumArgsInProto) 9923 ConvertedArgs.reserve(NumArgsInProto); 9924 else 9925 ConvertedArgs.reserve(NumArgs); 9926 9927 VariadicCallType CallType = 9928 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9929 SmallVector<Expr *, 8> AllArgs; 9930 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9931 Proto, 0, Args, NumArgs, AllArgs, 9932 CallType, AllowExplicit, 9933 IsListInitialization); 9934 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9935 9936 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9937 9938 CheckConstructorCall(Constructor, 9939 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 9940 AllArgs.size()), 9941 Proto, Loc); 9942 9943 return Invalid; 9944} 9945 9946static inline bool 9947CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9948 const FunctionDecl *FnDecl) { 9949 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9950 if (isa<NamespaceDecl>(DC)) { 9951 return SemaRef.Diag(FnDecl->getLocation(), 9952 diag::err_operator_new_delete_declared_in_namespace) 9953 << FnDecl->getDeclName(); 9954 } 9955 9956 if (isa<TranslationUnitDecl>(DC) && 9957 FnDecl->getStorageClass() == SC_Static) { 9958 return SemaRef.Diag(FnDecl->getLocation(), 9959 diag::err_operator_new_delete_declared_static) 9960 << FnDecl->getDeclName(); 9961 } 9962 9963 return false; 9964} 9965 9966static inline bool 9967CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9968 CanQualType ExpectedResultType, 9969 CanQualType ExpectedFirstParamType, 9970 unsigned DependentParamTypeDiag, 9971 unsigned InvalidParamTypeDiag) { 9972 QualType ResultType = 9973 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9974 9975 // Check that the result type is not dependent. 9976 if (ResultType->isDependentType()) 9977 return SemaRef.Diag(FnDecl->getLocation(), 9978 diag::err_operator_new_delete_dependent_result_type) 9979 << FnDecl->getDeclName() << ExpectedResultType; 9980 9981 // Check that the result type is what we expect. 9982 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9983 return SemaRef.Diag(FnDecl->getLocation(), 9984 diag::err_operator_new_delete_invalid_result_type) 9985 << FnDecl->getDeclName() << ExpectedResultType; 9986 9987 // A function template must have at least 2 parameters. 9988 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9989 return SemaRef.Diag(FnDecl->getLocation(), 9990 diag::err_operator_new_delete_template_too_few_parameters) 9991 << FnDecl->getDeclName(); 9992 9993 // The function decl must have at least 1 parameter. 9994 if (FnDecl->getNumParams() == 0) 9995 return SemaRef.Diag(FnDecl->getLocation(), 9996 diag::err_operator_new_delete_too_few_parameters) 9997 << FnDecl->getDeclName(); 9998 9999 // Check the first parameter type is not dependent. 10000 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 10001 if (FirstParamType->isDependentType()) 10002 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 10003 << FnDecl->getDeclName() << ExpectedFirstParamType; 10004 10005 // Check that the first parameter type is what we expect. 10006 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 10007 ExpectedFirstParamType) 10008 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 10009 << FnDecl->getDeclName() << ExpectedFirstParamType; 10010 10011 return false; 10012} 10013 10014static bool 10015CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 10016 // C++ [basic.stc.dynamic.allocation]p1: 10017 // A program is ill-formed if an allocation function is declared in a 10018 // namespace scope other than global scope or declared static in global 10019 // scope. 10020 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10021 return true; 10022 10023 CanQualType SizeTy = 10024 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 10025 10026 // C++ [basic.stc.dynamic.allocation]p1: 10027 // The return type shall be void*. The first parameter shall have type 10028 // std::size_t. 10029 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 10030 SizeTy, 10031 diag::err_operator_new_dependent_param_type, 10032 diag::err_operator_new_param_type)) 10033 return true; 10034 10035 // C++ [basic.stc.dynamic.allocation]p1: 10036 // The first parameter shall not have an associated default argument. 10037 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 10038 return SemaRef.Diag(FnDecl->getLocation(), 10039 diag::err_operator_new_default_arg) 10040 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 10041 10042 return false; 10043} 10044 10045static bool 10046CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 10047 // C++ [basic.stc.dynamic.deallocation]p1: 10048 // A program is ill-formed if deallocation functions are declared in a 10049 // namespace scope other than global scope or declared static in global 10050 // scope. 10051 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 10052 return true; 10053 10054 // C++ [basic.stc.dynamic.deallocation]p2: 10055 // Each deallocation function shall return void and its first parameter 10056 // shall be void*. 10057 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 10058 SemaRef.Context.VoidPtrTy, 10059 diag::err_operator_delete_dependent_param_type, 10060 diag::err_operator_delete_param_type)) 10061 return true; 10062 10063 return false; 10064} 10065 10066/// CheckOverloadedOperatorDeclaration - Check whether the declaration 10067/// of this overloaded operator is well-formed. If so, returns false; 10068/// otherwise, emits appropriate diagnostics and returns true. 10069bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 10070 assert(FnDecl && FnDecl->isOverloadedOperator() && 10071 "Expected an overloaded operator declaration"); 10072 10073 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 10074 10075 // C++ [over.oper]p5: 10076 // The allocation and deallocation functions, operator new, 10077 // operator new[], operator delete and operator delete[], are 10078 // described completely in 3.7.3. The attributes and restrictions 10079 // found in the rest of this subclause do not apply to them unless 10080 // explicitly stated in 3.7.3. 10081 if (Op == OO_Delete || Op == OO_Array_Delete) 10082 return CheckOperatorDeleteDeclaration(*this, FnDecl); 10083 10084 if (Op == OO_New || Op == OO_Array_New) 10085 return CheckOperatorNewDeclaration(*this, FnDecl); 10086 10087 // C++ [over.oper]p6: 10088 // An operator function shall either be a non-static member 10089 // function or be a non-member function and have at least one 10090 // parameter whose type is a class, a reference to a class, an 10091 // enumeration, or a reference to an enumeration. 10092 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 10093 if (MethodDecl->isStatic()) 10094 return Diag(FnDecl->getLocation(), 10095 diag::err_operator_overload_static) << FnDecl->getDeclName(); 10096 } else { 10097 bool ClassOrEnumParam = false; 10098 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10099 ParamEnd = FnDecl->param_end(); 10100 Param != ParamEnd; ++Param) { 10101 QualType ParamType = (*Param)->getType().getNonReferenceType(); 10102 if (ParamType->isDependentType() || ParamType->isRecordType() || 10103 ParamType->isEnumeralType()) { 10104 ClassOrEnumParam = true; 10105 break; 10106 } 10107 } 10108 10109 if (!ClassOrEnumParam) 10110 return Diag(FnDecl->getLocation(), 10111 diag::err_operator_overload_needs_class_or_enum) 10112 << FnDecl->getDeclName(); 10113 } 10114 10115 // C++ [over.oper]p8: 10116 // An operator function cannot have default arguments (8.3.6), 10117 // except where explicitly stated below. 10118 // 10119 // Only the function-call operator allows default arguments 10120 // (C++ [over.call]p1). 10121 if (Op != OO_Call) { 10122 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10123 Param != FnDecl->param_end(); ++Param) { 10124 if ((*Param)->hasDefaultArg()) 10125 return Diag((*Param)->getLocation(), 10126 diag::err_operator_overload_default_arg) 10127 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 10128 } 10129 } 10130 10131 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 10132 { false, false, false } 10133#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 10134 , { Unary, Binary, MemberOnly } 10135#include "clang/Basic/OperatorKinds.def" 10136 }; 10137 10138 bool CanBeUnaryOperator = OperatorUses[Op][0]; 10139 bool CanBeBinaryOperator = OperatorUses[Op][1]; 10140 bool MustBeMemberOperator = OperatorUses[Op][2]; 10141 10142 // C++ [over.oper]p8: 10143 // [...] Operator functions cannot have more or fewer parameters 10144 // than the number required for the corresponding operator, as 10145 // described in the rest of this subclause. 10146 unsigned NumParams = FnDecl->getNumParams() 10147 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 10148 if (Op != OO_Call && 10149 ((NumParams == 1 && !CanBeUnaryOperator) || 10150 (NumParams == 2 && !CanBeBinaryOperator) || 10151 (NumParams < 1) || (NumParams > 2))) { 10152 // We have the wrong number of parameters. 10153 unsigned ErrorKind; 10154 if (CanBeUnaryOperator && CanBeBinaryOperator) { 10155 ErrorKind = 2; // 2 -> unary or binary. 10156 } else if (CanBeUnaryOperator) { 10157 ErrorKind = 0; // 0 -> unary 10158 } else { 10159 assert(CanBeBinaryOperator && 10160 "All non-call overloaded operators are unary or binary!"); 10161 ErrorKind = 1; // 1 -> binary 10162 } 10163 10164 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 10165 << FnDecl->getDeclName() << NumParams << ErrorKind; 10166 } 10167 10168 // Overloaded operators other than operator() cannot be variadic. 10169 if (Op != OO_Call && 10170 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 10171 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 10172 << FnDecl->getDeclName(); 10173 } 10174 10175 // Some operators must be non-static member functions. 10176 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 10177 return Diag(FnDecl->getLocation(), 10178 diag::err_operator_overload_must_be_member) 10179 << FnDecl->getDeclName(); 10180 } 10181 10182 // C++ [over.inc]p1: 10183 // The user-defined function called operator++ implements the 10184 // prefix and postfix ++ operator. If this function is a member 10185 // function with no parameters, or a non-member function with one 10186 // parameter of class or enumeration type, it defines the prefix 10187 // increment operator ++ for objects of that type. If the function 10188 // is a member function with one parameter (which shall be of type 10189 // int) or a non-member function with two parameters (the second 10190 // of which shall be of type int), it defines the postfix 10191 // increment operator ++ for objects of that type. 10192 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10193 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10194 bool ParamIsInt = false; 10195 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10196 ParamIsInt = BT->getKind() == BuiltinType::Int; 10197 10198 if (!ParamIsInt) 10199 return Diag(LastParam->getLocation(), 10200 diag::err_operator_overload_post_incdec_must_be_int) 10201 << LastParam->getType() << (Op == OO_MinusMinus); 10202 } 10203 10204 return false; 10205} 10206 10207/// CheckLiteralOperatorDeclaration - Check whether the declaration 10208/// of this literal operator function is well-formed. If so, returns 10209/// false; otherwise, emits appropriate diagnostics and returns true. 10210bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10211 if (isa<CXXMethodDecl>(FnDecl)) { 10212 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10213 << FnDecl->getDeclName(); 10214 return true; 10215 } 10216 10217 if (FnDecl->isExternC()) { 10218 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10219 return true; 10220 } 10221 10222 bool Valid = false; 10223 10224 // This might be the definition of a literal operator template. 10225 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10226 // This might be a specialization of a literal operator template. 10227 if (!TpDecl) 10228 TpDecl = FnDecl->getPrimaryTemplate(); 10229 10230 // template <char...> type operator "" name() is the only valid template 10231 // signature, and the only valid signature with no parameters. 10232 if (TpDecl) { 10233 if (FnDecl->param_size() == 0) { 10234 // Must have only one template parameter 10235 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10236 if (Params->size() == 1) { 10237 NonTypeTemplateParmDecl *PmDecl = 10238 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10239 10240 // The template parameter must be a char parameter pack. 10241 if (PmDecl && PmDecl->isTemplateParameterPack() && 10242 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10243 Valid = true; 10244 } 10245 } 10246 } else if (FnDecl->param_size()) { 10247 // Check the first parameter 10248 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10249 10250 QualType T = (*Param)->getType().getUnqualifiedType(); 10251 10252 // unsigned long long int, long double, and any character type are allowed 10253 // as the only parameters. 10254 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10255 Context.hasSameType(T, Context.LongDoubleTy) || 10256 Context.hasSameType(T, Context.CharTy) || 10257 Context.hasSameType(T, Context.WCharTy) || 10258 Context.hasSameType(T, Context.Char16Ty) || 10259 Context.hasSameType(T, Context.Char32Ty)) { 10260 if (++Param == FnDecl->param_end()) 10261 Valid = true; 10262 goto FinishedParams; 10263 } 10264 10265 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10266 const PointerType *PT = T->getAs<PointerType>(); 10267 if (!PT) 10268 goto FinishedParams; 10269 T = PT->getPointeeType(); 10270 if (!T.isConstQualified() || T.isVolatileQualified()) 10271 goto FinishedParams; 10272 T = T.getUnqualifiedType(); 10273 10274 // Move on to the second parameter; 10275 ++Param; 10276 10277 // If there is no second parameter, the first must be a const char * 10278 if (Param == FnDecl->param_end()) { 10279 if (Context.hasSameType(T, Context.CharTy)) 10280 Valid = true; 10281 goto FinishedParams; 10282 } 10283 10284 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10285 // are allowed as the first parameter to a two-parameter function 10286 if (!(Context.hasSameType(T, Context.CharTy) || 10287 Context.hasSameType(T, Context.WCharTy) || 10288 Context.hasSameType(T, Context.Char16Ty) || 10289 Context.hasSameType(T, Context.Char32Ty))) 10290 goto FinishedParams; 10291 10292 // The second and final parameter must be an std::size_t 10293 T = (*Param)->getType().getUnqualifiedType(); 10294 if (Context.hasSameType(T, Context.getSizeType()) && 10295 ++Param == FnDecl->param_end()) 10296 Valid = true; 10297 } 10298 10299 // FIXME: This diagnostic is absolutely terrible. 10300FinishedParams: 10301 if (!Valid) { 10302 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10303 << FnDecl->getDeclName(); 10304 return true; 10305 } 10306 10307 // A parameter-declaration-clause containing a default argument is not 10308 // equivalent to any of the permitted forms. 10309 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10310 ParamEnd = FnDecl->param_end(); 10311 Param != ParamEnd; ++Param) { 10312 if ((*Param)->hasDefaultArg()) { 10313 Diag((*Param)->getDefaultArgRange().getBegin(), 10314 diag::err_literal_operator_default_argument) 10315 << (*Param)->getDefaultArgRange(); 10316 break; 10317 } 10318 } 10319 10320 StringRef LiteralName 10321 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10322 if (LiteralName[0] != '_') { 10323 // C++11 [usrlit.suffix]p1: 10324 // Literal suffix identifiers that do not start with an underscore 10325 // are reserved for future standardization. 10326 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10327 } 10328 10329 return false; 10330} 10331 10332/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10333/// linkage specification, including the language and (if present) 10334/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10335/// the location of the language string literal, which is provided 10336/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10337/// the '{' brace. Otherwise, this linkage specification does not 10338/// have any braces. 10339Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10340 SourceLocation LangLoc, 10341 StringRef Lang, 10342 SourceLocation LBraceLoc) { 10343 LinkageSpecDecl::LanguageIDs Language; 10344 if (Lang == "\"C\"") 10345 Language = LinkageSpecDecl::lang_c; 10346 else if (Lang == "\"C++\"") 10347 Language = LinkageSpecDecl::lang_cxx; 10348 else { 10349 Diag(LangLoc, diag::err_bad_language); 10350 return 0; 10351 } 10352 10353 // FIXME: Add all the various semantics of linkage specifications 10354 10355 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10356 ExternLoc, LangLoc, Language); 10357 CurContext->addDecl(D); 10358 PushDeclContext(S, D); 10359 return D; 10360} 10361 10362/// ActOnFinishLinkageSpecification - Complete the definition of 10363/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10364/// valid, it's the position of the closing '}' brace in a linkage 10365/// specification that uses braces. 10366Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10367 Decl *LinkageSpec, 10368 SourceLocation RBraceLoc) { 10369 if (LinkageSpec) { 10370 if (RBraceLoc.isValid()) { 10371 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10372 LSDecl->setRBraceLoc(RBraceLoc); 10373 } 10374 PopDeclContext(); 10375 } 10376 return LinkageSpec; 10377} 10378 10379Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10380 AttributeList *AttrList, 10381 SourceLocation SemiLoc) { 10382 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10383 // Attribute declarations appertain to empty declaration so we handle 10384 // them here. 10385 if (AttrList) 10386 ProcessDeclAttributeList(S, ED, AttrList); 10387 10388 CurContext->addDecl(ED); 10389 return ED; 10390} 10391 10392/// \brief Perform semantic analysis for the variable declaration that 10393/// occurs within a C++ catch clause, returning the newly-created 10394/// variable. 10395VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10396 TypeSourceInfo *TInfo, 10397 SourceLocation StartLoc, 10398 SourceLocation Loc, 10399 IdentifierInfo *Name) { 10400 bool Invalid = false; 10401 QualType ExDeclType = TInfo->getType(); 10402 10403 // Arrays and functions decay. 10404 if (ExDeclType->isArrayType()) 10405 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10406 else if (ExDeclType->isFunctionType()) 10407 ExDeclType = Context.getPointerType(ExDeclType); 10408 10409 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10410 // The exception-declaration shall not denote a pointer or reference to an 10411 // incomplete type, other than [cv] void*. 10412 // N2844 forbids rvalue references. 10413 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10414 Diag(Loc, diag::err_catch_rvalue_ref); 10415 Invalid = true; 10416 } 10417 10418 QualType BaseType = ExDeclType; 10419 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10420 unsigned DK = diag::err_catch_incomplete; 10421 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10422 BaseType = Ptr->getPointeeType(); 10423 Mode = 1; 10424 DK = diag::err_catch_incomplete_ptr; 10425 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10426 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10427 BaseType = Ref->getPointeeType(); 10428 Mode = 2; 10429 DK = diag::err_catch_incomplete_ref; 10430 } 10431 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10432 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10433 Invalid = true; 10434 10435 if (!Invalid && !ExDeclType->isDependentType() && 10436 RequireNonAbstractType(Loc, ExDeclType, 10437 diag::err_abstract_type_in_decl, 10438 AbstractVariableType)) 10439 Invalid = true; 10440 10441 // Only the non-fragile NeXT runtime currently supports C++ catches 10442 // of ObjC types, and no runtime supports catching ObjC types by value. 10443 if (!Invalid && getLangOpts().ObjC1) { 10444 QualType T = ExDeclType; 10445 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10446 T = RT->getPointeeType(); 10447 10448 if (T->isObjCObjectType()) { 10449 Diag(Loc, diag::err_objc_object_catch); 10450 Invalid = true; 10451 } else if (T->isObjCObjectPointerType()) { 10452 // FIXME: should this be a test for macosx-fragile specifically? 10453 if (getLangOpts().ObjCRuntime.isFragile()) 10454 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10455 } 10456 } 10457 10458 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10459 ExDeclType, TInfo, SC_None); 10460 ExDecl->setExceptionVariable(true); 10461 10462 // In ARC, infer 'retaining' for variables of retainable type. 10463 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10464 Invalid = true; 10465 10466 if (!Invalid && !ExDeclType->isDependentType()) { 10467 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10468 // Insulate this from anything else we might currently be parsing. 10469 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10470 10471 // C++ [except.handle]p16: 10472 // The object declared in an exception-declaration or, if the 10473 // exception-declaration does not specify a name, a temporary (12.2) is 10474 // copy-initialized (8.5) from the exception object. [...] 10475 // The object is destroyed when the handler exits, after the destruction 10476 // of any automatic objects initialized within the handler. 10477 // 10478 // We just pretend to initialize the object with itself, then make sure 10479 // it can be destroyed later. 10480 QualType initType = ExDeclType; 10481 10482 InitializedEntity entity = 10483 InitializedEntity::InitializeVariable(ExDecl); 10484 InitializationKind initKind = 10485 InitializationKind::CreateCopy(Loc, SourceLocation()); 10486 10487 Expr *opaqueValue = 10488 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10489 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10490 ExprResult result = sequence.Perform(*this, entity, initKind, 10491 MultiExprArg(&opaqueValue, 1)); 10492 if (result.isInvalid()) 10493 Invalid = true; 10494 else { 10495 // If the constructor used was non-trivial, set this as the 10496 // "initializer". 10497 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10498 if (!construct->getConstructor()->isTrivial()) { 10499 Expr *init = MaybeCreateExprWithCleanups(construct); 10500 ExDecl->setInit(init); 10501 } 10502 10503 // And make sure it's destructable. 10504 FinalizeVarWithDestructor(ExDecl, recordType); 10505 } 10506 } 10507 } 10508 10509 if (Invalid) 10510 ExDecl->setInvalidDecl(); 10511 10512 return ExDecl; 10513} 10514 10515/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10516/// handler. 10517Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10518 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10519 bool Invalid = D.isInvalidType(); 10520 10521 // Check for unexpanded parameter packs. 10522 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10523 UPPC_ExceptionType)) { 10524 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10525 D.getIdentifierLoc()); 10526 Invalid = true; 10527 } 10528 10529 IdentifierInfo *II = D.getIdentifier(); 10530 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10531 LookupOrdinaryName, 10532 ForRedeclaration)) { 10533 // The scope should be freshly made just for us. There is just no way 10534 // it contains any previous declaration. 10535 assert(!S->isDeclScope(PrevDecl)); 10536 if (PrevDecl->isTemplateParameter()) { 10537 // Maybe we will complain about the shadowed template parameter. 10538 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10539 PrevDecl = 0; 10540 } 10541 } 10542 10543 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10544 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10545 << D.getCXXScopeSpec().getRange(); 10546 Invalid = true; 10547 } 10548 10549 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10550 D.getLocStart(), 10551 D.getIdentifierLoc(), 10552 D.getIdentifier()); 10553 if (Invalid) 10554 ExDecl->setInvalidDecl(); 10555 10556 // Add the exception declaration into this scope. 10557 if (II) 10558 PushOnScopeChains(ExDecl, S); 10559 else 10560 CurContext->addDecl(ExDecl); 10561 10562 ProcessDeclAttributes(S, ExDecl, D); 10563 return ExDecl; 10564} 10565 10566Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10567 Expr *AssertExpr, 10568 Expr *AssertMessageExpr, 10569 SourceLocation RParenLoc) { 10570 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10571 10572 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10573 return 0; 10574 10575 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10576 AssertMessage, RParenLoc, false); 10577} 10578 10579Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10580 Expr *AssertExpr, 10581 StringLiteral *AssertMessage, 10582 SourceLocation RParenLoc, 10583 bool Failed) { 10584 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10585 !Failed) { 10586 // In a static_assert-declaration, the constant-expression shall be a 10587 // constant expression that can be contextually converted to bool. 10588 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10589 if (Converted.isInvalid()) 10590 Failed = true; 10591 10592 llvm::APSInt Cond; 10593 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10594 diag::err_static_assert_expression_is_not_constant, 10595 /*AllowFold=*/false).isInvalid()) 10596 Failed = true; 10597 10598 if (!Failed && !Cond) { 10599 SmallString<256> MsgBuffer; 10600 llvm::raw_svector_ostream Msg(MsgBuffer); 10601 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10602 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10603 << Msg.str() << AssertExpr->getSourceRange(); 10604 Failed = true; 10605 } 10606 } 10607 10608 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10609 AssertExpr, AssertMessage, RParenLoc, 10610 Failed); 10611 10612 CurContext->addDecl(Decl); 10613 return Decl; 10614} 10615 10616/// \brief Perform semantic analysis of the given friend type declaration. 10617/// 10618/// \returns A friend declaration that. 10619FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10620 SourceLocation FriendLoc, 10621 TypeSourceInfo *TSInfo) { 10622 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10623 10624 QualType T = TSInfo->getType(); 10625 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10626 10627 // C++03 [class.friend]p2: 10628 // An elaborated-type-specifier shall be used in a friend declaration 10629 // for a class.* 10630 // 10631 // * The class-key of the elaborated-type-specifier is required. 10632 if (!ActiveTemplateInstantiations.empty()) { 10633 // Do not complain about the form of friend template types during 10634 // template instantiation; we will already have complained when the 10635 // template was declared. 10636 } else { 10637 if (!T->isElaboratedTypeSpecifier()) { 10638 // If we evaluated the type to a record type, suggest putting 10639 // a tag in front. 10640 if (const RecordType *RT = T->getAs<RecordType>()) { 10641 RecordDecl *RD = RT->getDecl(); 10642 10643 std::string InsertionText = std::string(" ") + RD->getKindName(); 10644 10645 Diag(TypeRange.getBegin(), 10646 getLangOpts().CPlusPlus11 ? 10647 diag::warn_cxx98_compat_unelaborated_friend_type : 10648 diag::ext_unelaborated_friend_type) 10649 << (unsigned) RD->getTagKind() 10650 << T 10651 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10652 InsertionText); 10653 } else { 10654 Diag(FriendLoc, 10655 getLangOpts().CPlusPlus11 ? 10656 diag::warn_cxx98_compat_nonclass_type_friend : 10657 diag::ext_nonclass_type_friend) 10658 << T 10659 << TypeRange; 10660 } 10661 } else if (T->getAs<EnumType>()) { 10662 Diag(FriendLoc, 10663 getLangOpts().CPlusPlus11 ? 10664 diag::warn_cxx98_compat_enum_friend : 10665 diag::ext_enum_friend) 10666 << T 10667 << TypeRange; 10668 } 10669 10670 // C++11 [class.friend]p3: 10671 // A friend declaration that does not declare a function shall have one 10672 // of the following forms: 10673 // friend elaborated-type-specifier ; 10674 // friend simple-type-specifier ; 10675 // friend typename-specifier ; 10676 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10677 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10678 } 10679 10680 // If the type specifier in a friend declaration designates a (possibly 10681 // cv-qualified) class type, that class is declared as a friend; otherwise, 10682 // the friend declaration is ignored. 10683 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10684} 10685 10686/// Handle a friend tag declaration where the scope specifier was 10687/// templated. 10688Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10689 unsigned TagSpec, SourceLocation TagLoc, 10690 CXXScopeSpec &SS, 10691 IdentifierInfo *Name, 10692 SourceLocation NameLoc, 10693 AttributeList *Attr, 10694 MultiTemplateParamsArg TempParamLists) { 10695 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10696 10697 bool isExplicitSpecialization = false; 10698 bool Invalid = false; 10699 10700 if (TemplateParameterList *TemplateParams 10701 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10702 TempParamLists.data(), 10703 TempParamLists.size(), 10704 /*friend*/ true, 10705 isExplicitSpecialization, 10706 Invalid)) { 10707 if (TemplateParams->size() > 0) { 10708 // This is a declaration of a class template. 10709 if (Invalid) 10710 return 0; 10711 10712 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10713 SS, Name, NameLoc, Attr, 10714 TemplateParams, AS_public, 10715 /*ModulePrivateLoc=*/SourceLocation(), 10716 TempParamLists.size() - 1, 10717 TempParamLists.data()).take(); 10718 } else { 10719 // The "template<>" header is extraneous. 10720 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10721 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10722 isExplicitSpecialization = true; 10723 } 10724 } 10725 10726 if (Invalid) return 0; 10727 10728 bool isAllExplicitSpecializations = true; 10729 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10730 if (TempParamLists[I]->size()) { 10731 isAllExplicitSpecializations = false; 10732 break; 10733 } 10734 } 10735 10736 // FIXME: don't ignore attributes. 10737 10738 // If it's explicit specializations all the way down, just forget 10739 // about the template header and build an appropriate non-templated 10740 // friend. TODO: for source fidelity, remember the headers. 10741 if (isAllExplicitSpecializations) { 10742 if (SS.isEmpty()) { 10743 bool Owned = false; 10744 bool IsDependent = false; 10745 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10746 Attr, AS_public, 10747 /*ModulePrivateLoc=*/SourceLocation(), 10748 MultiTemplateParamsArg(), Owned, IsDependent, 10749 /*ScopedEnumKWLoc=*/SourceLocation(), 10750 /*ScopedEnumUsesClassTag=*/false, 10751 /*UnderlyingType=*/TypeResult()); 10752 } 10753 10754 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10755 ElaboratedTypeKeyword Keyword 10756 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10757 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10758 *Name, NameLoc); 10759 if (T.isNull()) 10760 return 0; 10761 10762 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10763 if (isa<DependentNameType>(T)) { 10764 DependentNameTypeLoc TL = 10765 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10766 TL.setElaboratedKeywordLoc(TagLoc); 10767 TL.setQualifierLoc(QualifierLoc); 10768 TL.setNameLoc(NameLoc); 10769 } else { 10770 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 10771 TL.setElaboratedKeywordLoc(TagLoc); 10772 TL.setQualifierLoc(QualifierLoc); 10773 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 10774 } 10775 10776 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10777 TSI, FriendLoc, TempParamLists); 10778 Friend->setAccess(AS_public); 10779 CurContext->addDecl(Friend); 10780 return Friend; 10781 } 10782 10783 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10784 10785 10786 10787 // Handle the case of a templated-scope friend class. e.g. 10788 // template <class T> class A<T>::B; 10789 // FIXME: we don't support these right now. 10790 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10791 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10792 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10793 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10794 TL.setElaboratedKeywordLoc(TagLoc); 10795 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10796 TL.setNameLoc(NameLoc); 10797 10798 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10799 TSI, FriendLoc, TempParamLists); 10800 Friend->setAccess(AS_public); 10801 Friend->setUnsupportedFriend(true); 10802 CurContext->addDecl(Friend); 10803 return Friend; 10804} 10805 10806 10807/// Handle a friend type declaration. This works in tandem with 10808/// ActOnTag. 10809/// 10810/// Notes on friend class templates: 10811/// 10812/// We generally treat friend class declarations as if they were 10813/// declaring a class. So, for example, the elaborated type specifier 10814/// in a friend declaration is required to obey the restrictions of a 10815/// class-head (i.e. no typedefs in the scope chain), template 10816/// parameters are required to match up with simple template-ids, &c. 10817/// However, unlike when declaring a template specialization, it's 10818/// okay to refer to a template specialization without an empty 10819/// template parameter declaration, e.g. 10820/// friend class A<T>::B<unsigned>; 10821/// We permit this as a special case; if there are any template 10822/// parameters present at all, require proper matching, i.e. 10823/// template <> template \<class T> friend class A<int>::B; 10824Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10825 MultiTemplateParamsArg TempParams) { 10826 SourceLocation Loc = DS.getLocStart(); 10827 10828 assert(DS.isFriendSpecified()); 10829 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10830 10831 // Try to convert the decl specifier to a type. This works for 10832 // friend templates because ActOnTag never produces a ClassTemplateDecl 10833 // for a TUK_Friend. 10834 Declarator TheDeclarator(DS, Declarator::MemberContext); 10835 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10836 QualType T = TSI->getType(); 10837 if (TheDeclarator.isInvalidType()) 10838 return 0; 10839 10840 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10841 return 0; 10842 10843 // This is definitely an error in C++98. It's probably meant to 10844 // be forbidden in C++0x, too, but the specification is just 10845 // poorly written. 10846 // 10847 // The problem is with declarations like the following: 10848 // template <T> friend A<T>::foo; 10849 // where deciding whether a class C is a friend or not now hinges 10850 // on whether there exists an instantiation of A that causes 10851 // 'foo' to equal C. There are restrictions on class-heads 10852 // (which we declare (by fiat) elaborated friend declarations to 10853 // be) that makes this tractable. 10854 // 10855 // FIXME: handle "template <> friend class A<T>;", which 10856 // is possibly well-formed? Who even knows? 10857 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10858 Diag(Loc, diag::err_tagless_friend_type_template) 10859 << DS.getSourceRange(); 10860 return 0; 10861 } 10862 10863 // C++98 [class.friend]p1: A friend of a class is a function 10864 // or class that is not a member of the class . . . 10865 // This is fixed in DR77, which just barely didn't make the C++03 10866 // deadline. It's also a very silly restriction that seriously 10867 // affects inner classes and which nobody else seems to implement; 10868 // thus we never diagnose it, not even in -pedantic. 10869 // 10870 // But note that we could warn about it: it's always useless to 10871 // friend one of your own members (it's not, however, worthless to 10872 // friend a member of an arbitrary specialization of your template). 10873 10874 Decl *D; 10875 if (unsigned NumTempParamLists = TempParams.size()) 10876 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10877 NumTempParamLists, 10878 TempParams.data(), 10879 TSI, 10880 DS.getFriendSpecLoc()); 10881 else 10882 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10883 10884 if (!D) 10885 return 0; 10886 10887 D->setAccess(AS_public); 10888 CurContext->addDecl(D); 10889 10890 return D; 10891} 10892 10893NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10894 MultiTemplateParamsArg TemplateParams) { 10895 const DeclSpec &DS = D.getDeclSpec(); 10896 10897 assert(DS.isFriendSpecified()); 10898 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10899 10900 SourceLocation Loc = D.getIdentifierLoc(); 10901 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10902 10903 // C++ [class.friend]p1 10904 // A friend of a class is a function or class.... 10905 // Note that this sees through typedefs, which is intended. 10906 // It *doesn't* see through dependent types, which is correct 10907 // according to [temp.arg.type]p3: 10908 // If a declaration acquires a function type through a 10909 // type dependent on a template-parameter and this causes 10910 // a declaration that does not use the syntactic form of a 10911 // function declarator to have a function type, the program 10912 // is ill-formed. 10913 if (!TInfo->getType()->isFunctionType()) { 10914 Diag(Loc, diag::err_unexpected_friend); 10915 10916 // It might be worthwhile to try to recover by creating an 10917 // appropriate declaration. 10918 return 0; 10919 } 10920 10921 // C++ [namespace.memdef]p3 10922 // - If a friend declaration in a non-local class first declares a 10923 // class or function, the friend class or function is a member 10924 // of the innermost enclosing namespace. 10925 // - The name of the friend is not found by simple name lookup 10926 // until a matching declaration is provided in that namespace 10927 // scope (either before or after the class declaration granting 10928 // friendship). 10929 // - If a friend function is called, its name may be found by the 10930 // name lookup that considers functions from namespaces and 10931 // classes associated with the types of the function arguments. 10932 // - When looking for a prior declaration of a class or a function 10933 // declared as a friend, scopes outside the innermost enclosing 10934 // namespace scope are not considered. 10935 10936 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10937 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10938 DeclarationName Name = NameInfo.getName(); 10939 assert(Name); 10940 10941 // Check for unexpanded parameter packs. 10942 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10943 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10944 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10945 return 0; 10946 10947 // The context we found the declaration in, or in which we should 10948 // create the declaration. 10949 DeclContext *DC; 10950 Scope *DCScope = S; 10951 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10952 ForRedeclaration); 10953 10954 // FIXME: there are different rules in local classes 10955 10956 // There are four cases here. 10957 // - There's no scope specifier, in which case we just go to the 10958 // appropriate scope and look for a function or function template 10959 // there as appropriate. 10960 // Recover from invalid scope qualifiers as if they just weren't there. 10961 if (SS.isInvalid() || !SS.isSet()) { 10962 // C++0x [namespace.memdef]p3: 10963 // If the name in a friend declaration is neither qualified nor 10964 // a template-id and the declaration is a function or an 10965 // elaborated-type-specifier, the lookup to determine whether 10966 // the entity has been previously declared shall not consider 10967 // any scopes outside the innermost enclosing namespace. 10968 // C++0x [class.friend]p11: 10969 // If a friend declaration appears in a local class and the name 10970 // specified is an unqualified name, a prior declaration is 10971 // looked up without considering scopes that are outside the 10972 // innermost enclosing non-class scope. For a friend function 10973 // declaration, if there is no prior declaration, the program is 10974 // ill-formed. 10975 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10976 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10977 10978 // Find the appropriate context according to the above. 10979 DC = CurContext; 10980 while (true) { 10981 // Skip class contexts. If someone can cite chapter and verse 10982 // for this behavior, that would be nice --- it's what GCC and 10983 // EDG do, and it seems like a reasonable intent, but the spec 10984 // really only says that checks for unqualified existing 10985 // declarations should stop at the nearest enclosing namespace, 10986 // not that they should only consider the nearest enclosing 10987 // namespace. 10988 while (DC->isRecord() || DC->isTransparentContext()) 10989 DC = DC->getParent(); 10990 10991 LookupQualifiedName(Previous, DC); 10992 10993 // TODO: decide what we think about using declarations. 10994 if (isLocal || !Previous.empty()) 10995 break; 10996 10997 if (isTemplateId) { 10998 if (isa<TranslationUnitDecl>(DC)) break; 10999 } else { 11000 if (DC->isFileContext()) break; 11001 } 11002 DC = DC->getParent(); 11003 } 11004 11005 DCScope = getScopeForDeclContext(S, DC); 11006 11007 // C++ [class.friend]p6: 11008 // A function can be defined in a friend declaration of a class if and 11009 // only if the class is a non-local class (9.8), the function name is 11010 // unqualified, and the function has namespace scope. 11011 if (isLocal && D.isFunctionDefinition()) { 11012 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 11013 } 11014 11015 // - There's a non-dependent scope specifier, in which case we 11016 // compute it and do a previous lookup there for a function 11017 // or function template. 11018 } else if (!SS.getScopeRep()->isDependent()) { 11019 DC = computeDeclContext(SS); 11020 if (!DC) return 0; 11021 11022 if (RequireCompleteDeclContext(SS, DC)) return 0; 11023 11024 LookupQualifiedName(Previous, DC); 11025 11026 // Ignore things found implicitly in the wrong scope. 11027 // TODO: better diagnostics for this case. Suggesting the right 11028 // qualified scope would be nice... 11029 LookupResult::Filter F = Previous.makeFilter(); 11030 while (F.hasNext()) { 11031 NamedDecl *D = F.next(); 11032 if (!DC->InEnclosingNamespaceSetOf( 11033 D->getDeclContext()->getRedeclContext())) 11034 F.erase(); 11035 } 11036 F.done(); 11037 11038 if (Previous.empty()) { 11039 D.setInvalidType(); 11040 Diag(Loc, diag::err_qualified_friend_not_found) 11041 << Name << TInfo->getType(); 11042 return 0; 11043 } 11044 11045 // C++ [class.friend]p1: A friend of a class is a function or 11046 // class that is not a member of the class . . . 11047 if (DC->Equals(CurContext)) 11048 Diag(DS.getFriendSpecLoc(), 11049 getLangOpts().CPlusPlus11 ? 11050 diag::warn_cxx98_compat_friend_is_member : 11051 diag::err_friend_is_member); 11052 11053 if (D.isFunctionDefinition()) { 11054 // C++ [class.friend]p6: 11055 // A function can be defined in a friend declaration of a class if and 11056 // only if the class is a non-local class (9.8), the function name is 11057 // unqualified, and the function has namespace scope. 11058 SemaDiagnosticBuilder DB 11059 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 11060 11061 DB << SS.getScopeRep(); 11062 if (DC->isFileContext()) 11063 DB << FixItHint::CreateRemoval(SS.getRange()); 11064 SS.clear(); 11065 } 11066 11067 // - There's a scope specifier that does not match any template 11068 // parameter lists, in which case we use some arbitrary context, 11069 // create a method or method template, and wait for instantiation. 11070 // - There's a scope specifier that does match some template 11071 // parameter lists, which we don't handle right now. 11072 } else { 11073 if (D.isFunctionDefinition()) { 11074 // C++ [class.friend]p6: 11075 // A function can be defined in a friend declaration of a class if and 11076 // only if the class is a non-local class (9.8), the function name is 11077 // unqualified, and the function has namespace scope. 11078 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 11079 << SS.getScopeRep(); 11080 } 11081 11082 DC = CurContext; 11083 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 11084 } 11085 11086 if (!DC->isRecord()) { 11087 // This implies that it has to be an operator or function. 11088 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 11089 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 11090 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 11091 Diag(Loc, diag::err_introducing_special_friend) << 11092 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 11093 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 11094 return 0; 11095 } 11096 } 11097 11098 // FIXME: This is an egregious hack to cope with cases where the scope stack 11099 // does not contain the declaration context, i.e., in an out-of-line 11100 // definition of a class. 11101 Scope FakeDCScope(S, Scope::DeclScope, Diags); 11102 if (!DCScope) { 11103 FakeDCScope.setEntity(DC); 11104 DCScope = &FakeDCScope; 11105 } 11106 11107 bool AddToScope = true; 11108 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 11109 TemplateParams, AddToScope); 11110 if (!ND) return 0; 11111 11112 assert(ND->getDeclContext() == DC); 11113 assert(ND->getLexicalDeclContext() == CurContext); 11114 11115 // Add the function declaration to the appropriate lookup tables, 11116 // adjusting the redeclarations list as necessary. We don't 11117 // want to do this yet if the friending class is dependent. 11118 // 11119 // Also update the scope-based lookup if the target context's 11120 // lookup context is in lexical scope. 11121 if (!CurContext->isDependentContext()) { 11122 DC = DC->getRedeclContext(); 11123 DC->makeDeclVisibleInContext(ND); 11124 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 11125 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 11126 } 11127 11128 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 11129 D.getIdentifierLoc(), ND, 11130 DS.getFriendSpecLoc()); 11131 FrD->setAccess(AS_public); 11132 CurContext->addDecl(FrD); 11133 11134 if (ND->isInvalidDecl()) { 11135 FrD->setInvalidDecl(); 11136 } else { 11137 if (DC->isRecord()) CheckFriendAccess(ND); 11138 11139 FunctionDecl *FD; 11140 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 11141 FD = FTD->getTemplatedDecl(); 11142 else 11143 FD = cast<FunctionDecl>(ND); 11144 11145 // Mark templated-scope function declarations as unsupported. 11146 if (FD->getNumTemplateParameterLists()) 11147 FrD->setUnsupportedFriend(true); 11148 } 11149 11150 return ND; 11151} 11152 11153void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 11154 AdjustDeclIfTemplate(Dcl); 11155 11156 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 11157 if (!Fn) { 11158 Diag(DelLoc, diag::err_deleted_non_function); 11159 return; 11160 } 11161 11162 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 11163 // Don't consider the implicit declaration we generate for explicit 11164 // specializations. FIXME: Do not generate these implicit declarations. 11165 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 11166 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 11167 Diag(DelLoc, diag::err_deleted_decl_not_first); 11168 Diag(Prev->getLocation(), diag::note_previous_declaration); 11169 } 11170 // If the declaration wasn't the first, we delete the function anyway for 11171 // recovery. 11172 Fn = Fn->getCanonicalDecl(); 11173 } 11174 11175 if (Fn->isDeleted()) 11176 return; 11177 11178 // See if we're deleting a function which is already known to override a 11179 // non-deleted virtual function. 11180 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Fn)) { 11181 bool IssuedDiagnostic = false; 11182 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 11183 E = MD->end_overridden_methods(); 11184 I != E; ++I) { 11185 if (!(*MD->begin_overridden_methods())->isDeleted()) { 11186 if (!IssuedDiagnostic) { 11187 Diag(DelLoc, diag::err_deleted_override) << MD->getDeclName(); 11188 IssuedDiagnostic = true; 11189 } 11190 Diag((*I)->getLocation(), diag::note_overridden_virtual_function); 11191 } 11192 } 11193 } 11194 11195 Fn->setDeletedAsWritten(); 11196} 11197 11198void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 11199 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 11200 11201 if (MD) { 11202 if (MD->getParent()->isDependentType()) { 11203 MD->setDefaulted(); 11204 MD->setExplicitlyDefaulted(); 11205 return; 11206 } 11207 11208 CXXSpecialMember Member = getSpecialMember(MD); 11209 if (Member == CXXInvalid) { 11210 Diag(DefaultLoc, diag::err_default_special_members); 11211 return; 11212 } 11213 11214 MD->setDefaulted(); 11215 MD->setExplicitlyDefaulted(); 11216 11217 // If this definition appears within the record, do the checking when 11218 // the record is complete. 11219 const FunctionDecl *Primary = MD; 11220 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11221 // Find the uninstantiated declaration that actually had the '= default' 11222 // on it. 11223 Pattern->isDefined(Primary); 11224 11225 // If the method was defaulted on its first declaration, we will have 11226 // already performed the checking in CheckCompletedCXXClass. Such a 11227 // declaration doesn't trigger an implicit definition. 11228 if (Primary == Primary->getCanonicalDecl()) 11229 return; 11230 11231 CheckExplicitlyDefaultedSpecialMember(MD); 11232 11233 // The exception specification is needed because we are defining the 11234 // function. 11235 ResolveExceptionSpec(DefaultLoc, 11236 MD->getType()->castAs<FunctionProtoType>()); 11237 11238 switch (Member) { 11239 case CXXDefaultConstructor: { 11240 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11241 if (!CD->isInvalidDecl()) 11242 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11243 break; 11244 } 11245 11246 case CXXCopyConstructor: { 11247 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11248 if (!CD->isInvalidDecl()) 11249 DefineImplicitCopyConstructor(DefaultLoc, CD); 11250 break; 11251 } 11252 11253 case CXXCopyAssignment: { 11254 if (!MD->isInvalidDecl()) 11255 DefineImplicitCopyAssignment(DefaultLoc, MD); 11256 break; 11257 } 11258 11259 case CXXDestructor: { 11260 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11261 if (!DD->isInvalidDecl()) 11262 DefineImplicitDestructor(DefaultLoc, DD); 11263 break; 11264 } 11265 11266 case CXXMoveConstructor: { 11267 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11268 if (!CD->isInvalidDecl()) 11269 DefineImplicitMoveConstructor(DefaultLoc, CD); 11270 break; 11271 } 11272 11273 case CXXMoveAssignment: { 11274 if (!MD->isInvalidDecl()) 11275 DefineImplicitMoveAssignment(DefaultLoc, MD); 11276 break; 11277 } 11278 11279 case CXXInvalid: 11280 llvm_unreachable("Invalid special member."); 11281 } 11282 } else { 11283 Diag(DefaultLoc, diag::err_default_special_members); 11284 } 11285} 11286 11287static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11288 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11289 Stmt *SubStmt = *CI; 11290 if (!SubStmt) 11291 continue; 11292 if (isa<ReturnStmt>(SubStmt)) 11293 Self.Diag(SubStmt->getLocStart(), 11294 diag::err_return_in_constructor_handler); 11295 if (!isa<Expr>(SubStmt)) 11296 SearchForReturnInStmt(Self, SubStmt); 11297 } 11298} 11299 11300void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11301 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11302 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11303 SearchForReturnInStmt(*this, Handler); 11304 } 11305} 11306 11307bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11308 const CXXMethodDecl *Old) { 11309 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11310 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11311 11312 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11313 11314 // If the calling conventions match, everything is fine 11315 if (NewCC == OldCC) 11316 return false; 11317 11318 // If either of the calling conventions are set to "default", we need to pick 11319 // something more sensible based on the target. This supports code where the 11320 // one method explicitly sets thiscall, and another has no explicit calling 11321 // convention. 11322 CallingConv Default = 11323 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11324 if (NewCC == CC_Default) 11325 NewCC = Default; 11326 if (OldCC == CC_Default) 11327 OldCC = Default; 11328 11329 // If the calling conventions still don't match, then report the error 11330 if (NewCC != OldCC) { 11331 Diag(New->getLocation(), 11332 diag::err_conflicting_overriding_cc_attributes) 11333 << New->getDeclName() << New->getType() << Old->getType(); 11334 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11335 return true; 11336 } 11337 11338 return false; 11339} 11340 11341bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11342 const CXXMethodDecl *Old) { 11343 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11344 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11345 11346 if (Context.hasSameType(NewTy, OldTy) || 11347 NewTy->isDependentType() || OldTy->isDependentType()) 11348 return false; 11349 11350 // Check if the return types are covariant 11351 QualType NewClassTy, OldClassTy; 11352 11353 /// Both types must be pointers or references to classes. 11354 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11355 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11356 NewClassTy = NewPT->getPointeeType(); 11357 OldClassTy = OldPT->getPointeeType(); 11358 } 11359 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11360 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11361 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11362 NewClassTy = NewRT->getPointeeType(); 11363 OldClassTy = OldRT->getPointeeType(); 11364 } 11365 } 11366 } 11367 11368 // The return types aren't either both pointers or references to a class type. 11369 if (NewClassTy.isNull()) { 11370 Diag(New->getLocation(), 11371 diag::err_different_return_type_for_overriding_virtual_function) 11372 << New->getDeclName() << NewTy << OldTy; 11373 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11374 11375 return true; 11376 } 11377 11378 // C++ [class.virtual]p6: 11379 // If the return type of D::f differs from the return type of B::f, the 11380 // class type in the return type of D::f shall be complete at the point of 11381 // declaration of D::f or shall be the class type D. 11382 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11383 if (!RT->isBeingDefined() && 11384 RequireCompleteType(New->getLocation(), NewClassTy, 11385 diag::err_covariant_return_incomplete, 11386 New->getDeclName())) 11387 return true; 11388 } 11389 11390 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11391 // Check if the new class derives from the old class. 11392 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11393 Diag(New->getLocation(), 11394 diag::err_covariant_return_not_derived) 11395 << New->getDeclName() << NewTy << OldTy; 11396 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11397 return true; 11398 } 11399 11400 // Check if we the conversion from derived to base is valid. 11401 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11402 diag::err_covariant_return_inaccessible_base, 11403 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11404 // FIXME: Should this point to the return type? 11405 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11406 // FIXME: this note won't trigger for delayed access control 11407 // diagnostics, and it's impossible to get an undelayed error 11408 // here from access control during the original parse because 11409 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11410 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11411 return true; 11412 } 11413 } 11414 11415 // The qualifiers of the return types must be the same. 11416 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11417 Diag(New->getLocation(), 11418 diag::err_covariant_return_type_different_qualifications) 11419 << New->getDeclName() << NewTy << OldTy; 11420 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11421 return true; 11422 }; 11423 11424 11425 // The new class type must have the same or less qualifiers as the old type. 11426 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11427 Diag(New->getLocation(), 11428 diag::err_covariant_return_type_class_type_more_qualified) 11429 << New->getDeclName() << NewTy << OldTy; 11430 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11431 return true; 11432 }; 11433 11434 return false; 11435} 11436 11437/// \brief Mark the given method pure. 11438/// 11439/// \param Method the method to be marked pure. 11440/// 11441/// \param InitRange the source range that covers the "0" initializer. 11442bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11443 SourceLocation EndLoc = InitRange.getEnd(); 11444 if (EndLoc.isValid()) 11445 Method->setRangeEnd(EndLoc); 11446 11447 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11448 Method->setPure(); 11449 return false; 11450 } 11451 11452 if (!Method->isInvalidDecl()) 11453 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11454 << Method->getDeclName() << InitRange; 11455 return true; 11456} 11457 11458/// \brief Determine whether the given declaration is a static data member. 11459static bool isStaticDataMember(Decl *D) { 11460 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11461 if (!Var) 11462 return false; 11463 11464 return Var->isStaticDataMember(); 11465} 11466/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11467/// an initializer for the out-of-line declaration 'Dcl'. The scope 11468/// is a fresh scope pushed for just this purpose. 11469/// 11470/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11471/// static data member of class X, names should be looked up in the scope of 11472/// class X. 11473void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11474 // If there is no declaration, there was an error parsing it. 11475 if (D == 0 || D->isInvalidDecl()) return; 11476 11477 // We should only get called for declarations with scope specifiers, like: 11478 // int foo::bar; 11479 assert(D->isOutOfLine()); 11480 EnterDeclaratorContext(S, D->getDeclContext()); 11481 11482 // If we are parsing the initializer for a static data member, push a 11483 // new expression evaluation context that is associated with this static 11484 // data member. 11485 if (isStaticDataMember(D)) 11486 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11487} 11488 11489/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11490/// initializer for the out-of-line declaration 'D'. 11491void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11492 // If there is no declaration, there was an error parsing it. 11493 if (D == 0 || D->isInvalidDecl()) return; 11494 11495 if (isStaticDataMember(D)) 11496 PopExpressionEvaluationContext(); 11497 11498 assert(D->isOutOfLine()); 11499 ExitDeclaratorContext(S); 11500} 11501 11502/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11503/// C++ if/switch/while/for statement. 11504/// e.g: "if (int x = f()) {...}" 11505DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11506 // C++ 6.4p2: 11507 // The declarator shall not specify a function or an array. 11508 // The type-specifier-seq shall not contain typedef and shall not declare a 11509 // new class or enumeration. 11510 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11511 "Parser allowed 'typedef' as storage class of condition decl."); 11512 11513 Decl *Dcl = ActOnDeclarator(S, D); 11514 if (!Dcl) 11515 return true; 11516 11517 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11518 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11519 << D.getSourceRange(); 11520 return true; 11521 } 11522 11523 return Dcl; 11524} 11525 11526void Sema::LoadExternalVTableUses() { 11527 if (!ExternalSource) 11528 return; 11529 11530 SmallVector<ExternalVTableUse, 4> VTables; 11531 ExternalSource->ReadUsedVTables(VTables); 11532 SmallVector<VTableUse, 4> NewUses; 11533 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11534 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11535 = VTablesUsed.find(VTables[I].Record); 11536 // Even if a definition wasn't required before, it may be required now. 11537 if (Pos != VTablesUsed.end()) { 11538 if (!Pos->second && VTables[I].DefinitionRequired) 11539 Pos->second = true; 11540 continue; 11541 } 11542 11543 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11544 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11545 } 11546 11547 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11548} 11549 11550void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11551 bool DefinitionRequired) { 11552 // Ignore any vtable uses in unevaluated operands or for classes that do 11553 // not have a vtable. 11554 if (!Class->isDynamicClass() || Class->isDependentContext() || 11555 CurContext->isDependentContext() || 11556 ExprEvalContexts.back().Context == Unevaluated) 11557 return; 11558 11559 // Try to insert this class into the map. 11560 LoadExternalVTableUses(); 11561 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11562 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11563 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11564 if (!Pos.second) { 11565 // If we already had an entry, check to see if we are promoting this vtable 11566 // to required a definition. If so, we need to reappend to the VTableUses 11567 // list, since we may have already processed the first entry. 11568 if (DefinitionRequired && !Pos.first->second) { 11569 Pos.first->second = true; 11570 } else { 11571 // Otherwise, we can early exit. 11572 return; 11573 } 11574 } 11575 11576 // Local classes need to have their virtual members marked 11577 // immediately. For all other classes, we mark their virtual members 11578 // at the end of the translation unit. 11579 if (Class->isLocalClass()) 11580 MarkVirtualMembersReferenced(Loc, Class); 11581 else 11582 VTableUses.push_back(std::make_pair(Class, Loc)); 11583} 11584 11585bool Sema::DefineUsedVTables() { 11586 LoadExternalVTableUses(); 11587 if (VTableUses.empty()) 11588 return false; 11589 11590 // Note: The VTableUses vector could grow as a result of marking 11591 // the members of a class as "used", so we check the size each 11592 // time through the loop and prefer indices (which are stable) to 11593 // iterators (which are not). 11594 bool DefinedAnything = false; 11595 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11596 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11597 if (!Class) 11598 continue; 11599 11600 SourceLocation Loc = VTableUses[I].second; 11601 11602 bool DefineVTable = true; 11603 11604 // If this class has a key function, but that key function is 11605 // defined in another translation unit, we don't need to emit the 11606 // vtable even though we're using it. 11607 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11608 if (KeyFunction && !KeyFunction->hasBody()) { 11609 switch (KeyFunction->getTemplateSpecializationKind()) { 11610 case TSK_Undeclared: 11611 case TSK_ExplicitSpecialization: 11612 case TSK_ExplicitInstantiationDeclaration: 11613 // The key function is in another translation unit. 11614 DefineVTable = false; 11615 break; 11616 11617 case TSK_ExplicitInstantiationDefinition: 11618 case TSK_ImplicitInstantiation: 11619 // We will be instantiating the key function. 11620 break; 11621 } 11622 } else if (!KeyFunction) { 11623 // If we have a class with no key function that is the subject 11624 // of an explicit instantiation declaration, suppress the 11625 // vtable; it will live with the explicit instantiation 11626 // definition. 11627 bool IsExplicitInstantiationDeclaration 11628 = Class->getTemplateSpecializationKind() 11629 == TSK_ExplicitInstantiationDeclaration; 11630 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11631 REnd = Class->redecls_end(); 11632 R != REnd; ++R) { 11633 TemplateSpecializationKind TSK 11634 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11635 if (TSK == TSK_ExplicitInstantiationDeclaration) 11636 IsExplicitInstantiationDeclaration = true; 11637 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11638 IsExplicitInstantiationDeclaration = false; 11639 break; 11640 } 11641 } 11642 11643 if (IsExplicitInstantiationDeclaration) 11644 DefineVTable = false; 11645 } 11646 11647 // The exception specifications for all virtual members may be needed even 11648 // if we are not providing an authoritative form of the vtable in this TU. 11649 // We may choose to emit it available_externally anyway. 11650 if (!DefineVTable) { 11651 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11652 continue; 11653 } 11654 11655 // Mark all of the virtual members of this class as referenced, so 11656 // that we can build a vtable. Then, tell the AST consumer that a 11657 // vtable for this class is required. 11658 DefinedAnything = true; 11659 MarkVirtualMembersReferenced(Loc, Class); 11660 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11661 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11662 11663 // Optionally warn if we're emitting a weak vtable. 11664 if (Class->hasExternalLinkage() && 11665 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11666 const FunctionDecl *KeyFunctionDef = 0; 11667 if (!KeyFunction || 11668 (KeyFunction->hasBody(KeyFunctionDef) && 11669 KeyFunctionDef->isInlined())) 11670 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11671 TSK_ExplicitInstantiationDefinition 11672 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11673 << Class; 11674 } 11675 } 11676 VTableUses.clear(); 11677 11678 return DefinedAnything; 11679} 11680 11681void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11682 const CXXRecordDecl *RD) { 11683 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11684 E = RD->method_end(); I != E; ++I) 11685 if ((*I)->isVirtual() && !(*I)->isPure()) 11686 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11687} 11688 11689void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11690 const CXXRecordDecl *RD) { 11691 // Mark all functions which will appear in RD's vtable as used. 11692 CXXFinalOverriderMap FinalOverriders; 11693 RD->getFinalOverriders(FinalOverriders); 11694 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11695 E = FinalOverriders.end(); 11696 I != E; ++I) { 11697 for (OverridingMethods::const_iterator OI = I->second.begin(), 11698 OE = I->second.end(); 11699 OI != OE; ++OI) { 11700 assert(OI->second.size() > 0 && "no final overrider"); 11701 CXXMethodDecl *Overrider = OI->second.front().Method; 11702 11703 // C++ [basic.def.odr]p2: 11704 // [...] A virtual member function is used if it is not pure. [...] 11705 if (!Overrider->isPure()) 11706 MarkFunctionReferenced(Loc, Overrider); 11707 } 11708 } 11709 11710 // Only classes that have virtual bases need a VTT. 11711 if (RD->getNumVBases() == 0) 11712 return; 11713 11714 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11715 e = RD->bases_end(); i != e; ++i) { 11716 const CXXRecordDecl *Base = 11717 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11718 if (Base->getNumVBases() == 0) 11719 continue; 11720 MarkVirtualMembersReferenced(Loc, Base); 11721 } 11722} 11723 11724/// SetIvarInitializers - This routine builds initialization ASTs for the 11725/// Objective-C implementation whose ivars need be initialized. 11726void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11727 if (!getLangOpts().CPlusPlus) 11728 return; 11729 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11730 SmallVector<ObjCIvarDecl*, 8> ivars; 11731 CollectIvarsToConstructOrDestruct(OID, ivars); 11732 if (ivars.empty()) 11733 return; 11734 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11735 for (unsigned i = 0; i < ivars.size(); i++) { 11736 FieldDecl *Field = ivars[i]; 11737 if (Field->isInvalidDecl()) 11738 continue; 11739 11740 CXXCtorInitializer *Member; 11741 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11742 InitializationKind InitKind = 11743 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11744 11745 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11746 ExprResult MemberInit = 11747 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11748 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11749 // Note, MemberInit could actually come back empty if no initialization 11750 // is required (e.g., because it would call a trivial default constructor) 11751 if (!MemberInit.get() || MemberInit.isInvalid()) 11752 continue; 11753 11754 Member = 11755 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11756 SourceLocation(), 11757 MemberInit.takeAs<Expr>(), 11758 SourceLocation()); 11759 AllToInit.push_back(Member); 11760 11761 // Be sure that the destructor is accessible and is marked as referenced. 11762 if (const RecordType *RecordTy 11763 = Context.getBaseElementType(Field->getType()) 11764 ->getAs<RecordType>()) { 11765 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11766 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11767 MarkFunctionReferenced(Field->getLocation(), Destructor); 11768 CheckDestructorAccess(Field->getLocation(), Destructor, 11769 PDiag(diag::err_access_dtor_ivar) 11770 << Context.getBaseElementType(Field->getType())); 11771 } 11772 } 11773 } 11774 ObjCImplementation->setIvarInitializers(Context, 11775 AllToInit.data(), AllToInit.size()); 11776 } 11777} 11778 11779static 11780void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11781 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11782 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11783 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11784 Sema &S) { 11785 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11786 CE = Current.end(); 11787 if (Ctor->isInvalidDecl()) 11788 return; 11789 11790 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11791 11792 // Target may not be determinable yet, for instance if this is a dependent 11793 // call in an uninstantiated template. 11794 if (Target) { 11795 const FunctionDecl *FNTarget = 0; 11796 (void)Target->hasBody(FNTarget); 11797 Target = const_cast<CXXConstructorDecl*>( 11798 cast_or_null<CXXConstructorDecl>(FNTarget)); 11799 } 11800 11801 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11802 // Avoid dereferencing a null pointer here. 11803 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11804 11805 if (!Current.insert(Canonical)) 11806 return; 11807 11808 // We know that beyond here, we aren't chaining into a cycle. 11809 if (!Target || !Target->isDelegatingConstructor() || 11810 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11811 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11812 Valid.insert(*CI); 11813 Current.clear(); 11814 // We've hit a cycle. 11815 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11816 Current.count(TCanonical)) { 11817 // If we haven't diagnosed this cycle yet, do so now. 11818 if (!Invalid.count(TCanonical)) { 11819 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11820 diag::warn_delegating_ctor_cycle) 11821 << Ctor; 11822 11823 // Don't add a note for a function delegating directly to itself. 11824 if (TCanonical != Canonical) 11825 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11826 11827 CXXConstructorDecl *C = Target; 11828 while (C->getCanonicalDecl() != Canonical) { 11829 const FunctionDecl *FNTarget = 0; 11830 (void)C->getTargetConstructor()->hasBody(FNTarget); 11831 assert(FNTarget && "Ctor cycle through bodiless function"); 11832 11833 C = const_cast<CXXConstructorDecl*>( 11834 cast<CXXConstructorDecl>(FNTarget)); 11835 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11836 } 11837 } 11838 11839 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11840 Invalid.insert(*CI); 11841 Current.clear(); 11842 } else { 11843 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11844 } 11845} 11846 11847 11848void Sema::CheckDelegatingCtorCycles() { 11849 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11850 11851 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11852 CE = Current.end(); 11853 11854 for (DelegatingCtorDeclsType::iterator 11855 I = DelegatingCtorDecls.begin(ExternalSource), 11856 E = DelegatingCtorDecls.end(); 11857 I != E; ++I) 11858 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11859 11860 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11861 (*CI)->setInvalidDecl(); 11862} 11863 11864namespace { 11865 /// \brief AST visitor that finds references to the 'this' expression. 11866 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11867 Sema &S; 11868 11869 public: 11870 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11871 11872 bool VisitCXXThisExpr(CXXThisExpr *E) { 11873 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11874 << E->isImplicit(); 11875 return false; 11876 } 11877 }; 11878} 11879 11880bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11881 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11882 if (!TSInfo) 11883 return false; 11884 11885 TypeLoc TL = TSInfo->getTypeLoc(); 11886 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11887 if (!ProtoTL) 11888 return false; 11889 11890 // C++11 [expr.prim.general]p3: 11891 // [The expression this] shall not appear before the optional 11892 // cv-qualifier-seq and it shall not appear within the declaration of a 11893 // static member function (although its type and value category are defined 11894 // within a static member function as they are within a non-static member 11895 // function). [ Note: this is because declaration matching does not occur 11896 // until the complete declarator is known. - end note ] 11897 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11898 FindCXXThisExpr Finder(*this); 11899 11900 // If the return type came after the cv-qualifier-seq, check it now. 11901 if (Proto->hasTrailingReturn() && 11902 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 11903 return true; 11904 11905 // Check the exception specification. 11906 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11907 return true; 11908 11909 return checkThisInStaticMemberFunctionAttributes(Method); 11910} 11911 11912bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11913 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11914 if (!TSInfo) 11915 return false; 11916 11917 TypeLoc TL = TSInfo->getTypeLoc(); 11918 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11919 if (!ProtoTL) 11920 return false; 11921 11922 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11923 FindCXXThisExpr Finder(*this); 11924 11925 switch (Proto->getExceptionSpecType()) { 11926 case EST_Uninstantiated: 11927 case EST_Unevaluated: 11928 case EST_BasicNoexcept: 11929 case EST_DynamicNone: 11930 case EST_MSAny: 11931 case EST_None: 11932 break; 11933 11934 case EST_ComputedNoexcept: 11935 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11936 return true; 11937 11938 case EST_Dynamic: 11939 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11940 EEnd = Proto->exception_end(); 11941 E != EEnd; ++E) { 11942 if (!Finder.TraverseType(*E)) 11943 return true; 11944 } 11945 break; 11946 } 11947 11948 return false; 11949} 11950 11951bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11952 FindCXXThisExpr Finder(*this); 11953 11954 // Check attributes. 11955 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11956 A != AEnd; ++A) { 11957 // FIXME: This should be emitted by tblgen. 11958 Expr *Arg = 0; 11959 ArrayRef<Expr *> Args; 11960 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11961 Arg = G->getArg(); 11962 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11963 Arg = G->getArg(); 11964 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11965 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11966 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11967 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11968 else if (ExclusiveLockFunctionAttr *ELF 11969 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11970 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11971 else if (SharedLockFunctionAttr *SLF 11972 = dyn_cast<SharedLockFunctionAttr>(*A)) 11973 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11974 else if (ExclusiveTrylockFunctionAttr *ETLF 11975 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11976 Arg = ETLF->getSuccessValue(); 11977 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11978 } else if (SharedTrylockFunctionAttr *STLF 11979 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11980 Arg = STLF->getSuccessValue(); 11981 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11982 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11983 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11984 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11985 Arg = LR->getArg(); 11986 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11987 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11988 else if (ExclusiveLocksRequiredAttr *ELR 11989 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11990 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11991 else if (SharedLocksRequiredAttr *SLR 11992 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11993 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11994 11995 if (Arg && !Finder.TraverseStmt(Arg)) 11996 return true; 11997 11998 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11999 if (!Finder.TraverseStmt(Args[I])) 12000 return true; 12001 } 12002 } 12003 12004 return false; 12005} 12006 12007void 12008Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 12009 ArrayRef<ParsedType> DynamicExceptions, 12010 ArrayRef<SourceRange> DynamicExceptionRanges, 12011 Expr *NoexceptExpr, 12012 SmallVectorImpl<QualType> &Exceptions, 12013 FunctionProtoType::ExtProtoInfo &EPI) { 12014 Exceptions.clear(); 12015 EPI.ExceptionSpecType = EST; 12016 if (EST == EST_Dynamic) { 12017 Exceptions.reserve(DynamicExceptions.size()); 12018 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 12019 // FIXME: Preserve type source info. 12020 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 12021 12022 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 12023 collectUnexpandedParameterPacks(ET, Unexpanded); 12024 if (!Unexpanded.empty()) { 12025 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 12026 UPPC_ExceptionType, 12027 Unexpanded); 12028 continue; 12029 } 12030 12031 // Check that the type is valid for an exception spec, and 12032 // drop it if not. 12033 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 12034 Exceptions.push_back(ET); 12035 } 12036 EPI.NumExceptions = Exceptions.size(); 12037 EPI.Exceptions = Exceptions.data(); 12038 return; 12039 } 12040 12041 if (EST == EST_ComputedNoexcept) { 12042 // If an error occurred, there's no expression here. 12043 if (NoexceptExpr) { 12044 assert((NoexceptExpr->isTypeDependent() || 12045 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 12046 Context.BoolTy) && 12047 "Parser should have made sure that the expression is boolean"); 12048 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 12049 EPI.ExceptionSpecType = EST_BasicNoexcept; 12050 return; 12051 } 12052 12053 if (!NoexceptExpr->isValueDependent()) 12054 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 12055 diag::err_noexcept_needs_constant_expression, 12056 /*AllowFold*/ false).take(); 12057 EPI.NoexceptExpr = NoexceptExpr; 12058 } 12059 return; 12060 } 12061} 12062 12063/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 12064Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 12065 // Implicitly declared functions (e.g. copy constructors) are 12066 // __host__ __device__ 12067 if (D->isImplicit()) 12068 return CFT_HostDevice; 12069 12070 if (D->hasAttr<CUDAGlobalAttr>()) 12071 return CFT_Global; 12072 12073 if (D->hasAttr<CUDADeviceAttr>()) { 12074 if (D->hasAttr<CUDAHostAttr>()) 12075 return CFT_HostDevice; 12076 else 12077 return CFT_Device; 12078 } 12079 12080 return CFT_Host; 12081} 12082 12083bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 12084 CUDAFunctionTarget CalleeTarget) { 12085 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 12086 // Callable from the device only." 12087 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 12088 return true; 12089 12090 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 12091 // Callable from the host only." 12092 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 12093 // Callable from the host only." 12094 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 12095 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 12096 return true; 12097 12098 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 12099 return true; 12100 12101 return false; 12102} 12103 12104/// HandleMSProperty - Analyze a __delcspec(property) field of a C++ class. 12105/// 12106MSPropertyDecl *Sema::HandleMSProperty(Scope *S, RecordDecl *Record, 12107 SourceLocation DeclStart, 12108 Declarator &D, Expr *BitWidth, 12109 InClassInitStyle InitStyle, 12110 AccessSpecifier AS, 12111 AttributeList *MSPropertyAttr) { 12112 IdentifierInfo *II = D.getIdentifier(); 12113 if (!II) { 12114 Diag(DeclStart, diag::err_anonymous_property); 12115 return NULL; 12116 } 12117 SourceLocation Loc = D.getIdentifierLoc(); 12118 12119 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 12120 QualType T = TInfo->getType(); 12121 if (getLangOpts().CPlusPlus) { 12122 CheckExtraCXXDefaultArguments(D); 12123 12124 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 12125 UPPC_DataMemberType)) { 12126 D.setInvalidType(); 12127 T = Context.IntTy; 12128 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 12129 } 12130 } 12131 12132 DiagnoseFunctionSpecifiers(D.getDeclSpec()); 12133 12134 if (DeclSpec::TSCS TSCS = D.getDeclSpec().getThreadStorageClassSpec()) 12135 Diag(D.getDeclSpec().getThreadStorageClassSpecLoc(), 12136 diag::err_invalid_thread) 12137 << DeclSpec::getSpecifierName(TSCS); 12138 12139 // Check to see if this name was declared as a member previously 12140 NamedDecl *PrevDecl = 0; 12141 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 12142 LookupName(Previous, S); 12143 switch (Previous.getResultKind()) { 12144 case LookupResult::Found: 12145 case LookupResult::FoundUnresolvedValue: 12146 PrevDecl = Previous.getAsSingle<NamedDecl>(); 12147 break; 12148 12149 case LookupResult::FoundOverloaded: 12150 PrevDecl = Previous.getRepresentativeDecl(); 12151 break; 12152 12153 case LookupResult::NotFound: 12154 case LookupResult::NotFoundInCurrentInstantiation: 12155 case LookupResult::Ambiguous: 12156 break; 12157 } 12158 12159 if (PrevDecl && PrevDecl->isTemplateParameter()) { 12160 // Maybe we will complain about the shadowed template parameter. 12161 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 12162 // Just pretend that we didn't see the previous declaration. 12163 PrevDecl = 0; 12164 } 12165 12166 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 12167 PrevDecl = 0; 12168 12169 SourceLocation TSSL = D.getLocStart(); 12170 MSPropertyDecl *NewPD; 12171 const AttributeList::PropertyData &Data = MSPropertyAttr->getPropertyData(); 12172 NewPD = new (Context) MSPropertyDecl(Record, Loc, 12173 II, T, TInfo, TSSL, 12174 Data.GetterId, Data.SetterId); 12175 ProcessDeclAttributes(TUScope, NewPD, D); 12176 NewPD->setAccess(AS); 12177 12178 if (NewPD->isInvalidDecl()) 12179 Record->setInvalidDecl(); 12180 12181 if (D.getDeclSpec().isModulePrivateSpecified()) 12182 NewPD->setModulePrivate(); 12183 12184 if (NewPD->isInvalidDecl() && PrevDecl) { 12185 // Don't introduce NewFD into scope; there's already something 12186 // with the same name in the same scope. 12187 } else if (II) { 12188 PushOnScopeChains(NewPD, S); 12189 } else 12190 Record->addDecl(NewPD); 12191 12192 return NewPD; 12193} 12194