SemaDeclCXX.cpp revision 621ba4f0dba0accdf67fb38e98bbe14db22ddf8e
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/Sema/CXXFieldCollector.h" 16#include "clang/Sema/Scope.h" 17#include "clang/Sema/Initialization.h" 18#include "clang/Sema/Lookup.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "clang/AST/ASTConsumer.h" 21#include "clang/AST/ASTContext.h" 22#include "clang/AST/ASTMutationListener.h" 23#include "clang/AST/CharUnits.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclVisitor.h" 26#include "clang/AST/EvaluatedExprVisitor.h" 27#include "clang/AST/ExprCXX.h" 28#include "clang/AST/RecordLayout.h" 29#include "clang/AST/RecursiveASTVisitor.h" 30#include "clang/AST/StmtVisitor.h" 31#include "clang/AST/TypeLoc.h" 32#include "clang/AST/TypeOrdering.h" 33#include "clang/Sema/DeclSpec.h" 34#include "clang/Sema/ParsedTemplate.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Lex/Preprocessor.h" 37#include "llvm/ADT/SmallString.h" 38#include "llvm/ADT/STLExtras.h" 39#include <map> 40#include <set> 41 42using namespace clang; 43 44//===----------------------------------------------------------------------===// 45// CheckDefaultArgumentVisitor 46//===----------------------------------------------------------------------===// 47 48namespace { 49 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 50 /// the default argument of a parameter to determine whether it 51 /// contains any ill-formed subexpressions. For example, this will 52 /// diagnose the use of local variables or parameters within the 53 /// default argument expression. 54 class CheckDefaultArgumentVisitor 55 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 56 Expr *DefaultArg; 57 Sema *S; 58 59 public: 60 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 61 : DefaultArg(defarg), S(s) {} 62 63 bool VisitExpr(Expr *Node); 64 bool VisitDeclRefExpr(DeclRefExpr *DRE); 65 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 66 bool VisitLambdaExpr(LambdaExpr *Lambda); 67 }; 68 69 /// VisitExpr - Visit all of the children of this expression. 70 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 71 bool IsInvalid = false; 72 for (Stmt::child_range I = Node->children(); I; ++I) 73 IsInvalid |= Visit(*I); 74 return IsInvalid; 75 } 76 77 /// VisitDeclRefExpr - Visit a reference to a declaration, to 78 /// determine whether this declaration can be used in the default 79 /// argument expression. 80 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 81 NamedDecl *Decl = DRE->getDecl(); 82 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 83 // C++ [dcl.fct.default]p9 84 // Default arguments are evaluated each time the function is 85 // called. The order of evaluation of function arguments is 86 // unspecified. Consequently, parameters of a function shall not 87 // be used in default argument expressions, even if they are not 88 // evaluated. Parameters of a function declared before a default 89 // argument expression are in scope and can hide namespace and 90 // class member names. 91 return S->Diag(DRE->getLocStart(), 92 diag::err_param_default_argument_references_param) 93 << Param->getDeclName() << DefaultArg->getSourceRange(); 94 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 95 // C++ [dcl.fct.default]p7 96 // Local variables shall not be used in default argument 97 // expressions. 98 if (VDecl->isLocalVarDecl()) 99 return S->Diag(DRE->getLocStart(), 100 diag::err_param_default_argument_references_local) 101 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 102 } 103 104 return false; 105 } 106 107 /// VisitCXXThisExpr - Visit a C++ "this" expression. 108 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 109 // C++ [dcl.fct.default]p8: 110 // The keyword this shall not be used in a default argument of a 111 // member function. 112 return S->Diag(ThisE->getLocStart(), 113 diag::err_param_default_argument_references_this) 114 << ThisE->getSourceRange(); 115 } 116 117 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 118 // C++11 [expr.lambda.prim]p13: 119 // A lambda-expression appearing in a default argument shall not 120 // implicitly or explicitly capture any entity. 121 if (Lambda->capture_begin() == Lambda->capture_end()) 122 return false; 123 124 return S->Diag(Lambda->getLocStart(), 125 diag::err_lambda_capture_default_arg); 126 } 127} 128 129void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 130 CXXMethodDecl *Method) { 131 // If we have an MSAny spec already, don't bother. 132 if (!Method || ComputedEST == EST_MSAny) 133 return; 134 135 const FunctionProtoType *Proto 136 = Method->getType()->getAs<FunctionProtoType>(); 137 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 138 if (!Proto) 139 return; 140 141 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 142 143 // If this function can throw any exceptions, make a note of that. 144 if (EST == EST_MSAny || EST == EST_None) { 145 ClearExceptions(); 146 ComputedEST = EST; 147 return; 148 } 149 150 // FIXME: If the call to this decl is using any of its default arguments, we 151 // need to search them for potentially-throwing calls. 152 153 // If this function has a basic noexcept, it doesn't affect the outcome. 154 if (EST == EST_BasicNoexcept) 155 return; 156 157 // If we have a throw-all spec at this point, ignore the function. 158 if (ComputedEST == EST_None) 159 return; 160 161 // If we're still at noexcept(true) and there's a nothrow() callee, 162 // change to that specification. 163 if (EST == EST_DynamicNone) { 164 if (ComputedEST == EST_BasicNoexcept) 165 ComputedEST = EST_DynamicNone; 166 return; 167 } 168 169 // Check out noexcept specs. 170 if (EST == EST_ComputedNoexcept) { 171 FunctionProtoType::NoexceptResult NR = 172 Proto->getNoexceptSpec(Self->Context); 173 assert(NR != FunctionProtoType::NR_NoNoexcept && 174 "Must have noexcept result for EST_ComputedNoexcept."); 175 assert(NR != FunctionProtoType::NR_Dependent && 176 "Should not generate implicit declarations for dependent cases, " 177 "and don't know how to handle them anyway."); 178 179 // noexcept(false) -> no spec on the new function 180 if (NR == FunctionProtoType::NR_Throw) { 181 ClearExceptions(); 182 ComputedEST = EST_None; 183 } 184 // noexcept(true) won't change anything either. 185 return; 186 } 187 188 assert(EST == EST_Dynamic && "EST case not considered earlier."); 189 assert(ComputedEST != EST_None && 190 "Shouldn't collect exceptions when throw-all is guaranteed."); 191 ComputedEST = EST_Dynamic; 192 // Record the exceptions in this function's exception specification. 193 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 194 EEnd = Proto->exception_end(); 195 E != EEnd; ++E) 196 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 197 Exceptions.push_back(*E); 198} 199 200void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 201 if (!E || ComputedEST == EST_MSAny) 202 return; 203 204 // FIXME: 205 // 206 // C++0x [except.spec]p14: 207 // [An] implicit exception-specification specifies the type-id T if and 208 // only if T is allowed by the exception-specification of a function directly 209 // invoked by f's implicit definition; f shall allow all exceptions if any 210 // function it directly invokes allows all exceptions, and f shall allow no 211 // exceptions if every function it directly invokes allows no exceptions. 212 // 213 // Note in particular that if an implicit exception-specification is generated 214 // for a function containing a throw-expression, that specification can still 215 // be noexcept(true). 216 // 217 // Note also that 'directly invoked' is not defined in the standard, and there 218 // is no indication that we should only consider potentially-evaluated calls. 219 // 220 // Ultimately we should implement the intent of the standard: the exception 221 // specification should be the set of exceptions which can be thrown by the 222 // implicit definition. For now, we assume that any non-nothrow expression can 223 // throw any exception. 224 225 if (Self->canThrow(E)) 226 ComputedEST = EST_None; 227} 228 229bool 230Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 231 SourceLocation EqualLoc) { 232 if (RequireCompleteType(Param->getLocation(), Param->getType(), 233 diag::err_typecheck_decl_incomplete_type)) { 234 Param->setInvalidDecl(); 235 return true; 236 } 237 238 // C++ [dcl.fct.default]p5 239 // A default argument expression is implicitly converted (clause 240 // 4) to the parameter type. The default argument expression has 241 // the same semantic constraints as the initializer expression in 242 // a declaration of a variable of the parameter type, using the 243 // copy-initialization semantics (8.5). 244 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 245 Param); 246 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 247 EqualLoc); 248 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 249 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 250 if (Result.isInvalid()) 251 return true; 252 Arg = Result.takeAs<Expr>(); 253 254 CheckImplicitConversions(Arg, EqualLoc); 255 Arg = MaybeCreateExprWithCleanups(Arg); 256 257 // Okay: add the default argument to the parameter 258 Param->setDefaultArg(Arg); 259 260 // We have already instantiated this parameter; provide each of the 261 // instantiations with the uninstantiated default argument. 262 UnparsedDefaultArgInstantiationsMap::iterator InstPos 263 = UnparsedDefaultArgInstantiations.find(Param); 264 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 265 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 266 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 267 268 // We're done tracking this parameter's instantiations. 269 UnparsedDefaultArgInstantiations.erase(InstPos); 270 } 271 272 return false; 273} 274 275/// ActOnParamDefaultArgument - Check whether the default argument 276/// provided for a function parameter is well-formed. If so, attach it 277/// to the parameter declaration. 278void 279Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 280 Expr *DefaultArg) { 281 if (!param || !DefaultArg) 282 return; 283 284 ParmVarDecl *Param = cast<ParmVarDecl>(param); 285 UnparsedDefaultArgLocs.erase(Param); 286 287 // Default arguments are only permitted in C++ 288 if (!getLangOpts().CPlusPlus) { 289 Diag(EqualLoc, diag::err_param_default_argument) 290 << DefaultArg->getSourceRange(); 291 Param->setInvalidDecl(); 292 return; 293 } 294 295 // Check for unexpanded parameter packs. 296 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 297 Param->setInvalidDecl(); 298 return; 299 } 300 301 // Check that the default argument is well-formed 302 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 303 if (DefaultArgChecker.Visit(DefaultArg)) { 304 Param->setInvalidDecl(); 305 return; 306 } 307 308 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 309} 310 311/// ActOnParamUnparsedDefaultArgument - We've seen a default 312/// argument for a function parameter, but we can't parse it yet 313/// because we're inside a class definition. Note that this default 314/// argument will be parsed later. 315void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 316 SourceLocation EqualLoc, 317 SourceLocation ArgLoc) { 318 if (!param) 319 return; 320 321 ParmVarDecl *Param = cast<ParmVarDecl>(param); 322 if (Param) 323 Param->setUnparsedDefaultArg(); 324 325 UnparsedDefaultArgLocs[Param] = ArgLoc; 326} 327 328/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 329/// the default argument for the parameter param failed. 330void Sema::ActOnParamDefaultArgumentError(Decl *param) { 331 if (!param) 332 return; 333 334 ParmVarDecl *Param = cast<ParmVarDecl>(param); 335 336 Param->setInvalidDecl(); 337 338 UnparsedDefaultArgLocs.erase(Param); 339} 340 341/// CheckExtraCXXDefaultArguments - Check for any extra default 342/// arguments in the declarator, which is not a function declaration 343/// or definition and therefore is not permitted to have default 344/// arguments. This routine should be invoked for every declarator 345/// that is not a function declaration or definition. 346void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 347 // C++ [dcl.fct.default]p3 348 // A default argument expression shall be specified only in the 349 // parameter-declaration-clause of a function declaration or in a 350 // template-parameter (14.1). It shall not be specified for a 351 // parameter pack. If it is specified in a 352 // parameter-declaration-clause, it shall not occur within a 353 // declarator or abstract-declarator of a parameter-declaration. 354 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 355 DeclaratorChunk &chunk = D.getTypeObject(i); 356 if (chunk.Kind == DeclaratorChunk::Function) { 357 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 358 ParmVarDecl *Param = 359 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 360 if (Param->hasUnparsedDefaultArg()) { 361 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 362 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 363 << SourceRange((*Toks)[1].getLocation(), Toks->back().getLocation()); 364 delete Toks; 365 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 366 } else if (Param->getDefaultArg()) { 367 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 368 << Param->getDefaultArg()->getSourceRange(); 369 Param->setDefaultArg(0); 370 } 371 } 372 } 373 } 374} 375 376/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 377/// function, once we already know that they have the same 378/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 379/// error, false otherwise. 380bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 381 Scope *S) { 382 bool Invalid = false; 383 384 // C++ [dcl.fct.default]p4: 385 // For non-template functions, default arguments can be added in 386 // later declarations of a function in the same 387 // scope. Declarations in different scopes have completely 388 // distinct sets of default arguments. That is, declarations in 389 // inner scopes do not acquire default arguments from 390 // declarations in outer scopes, and vice versa. In a given 391 // function declaration, all parameters subsequent to a 392 // parameter with a default argument shall have default 393 // arguments supplied in this or previous declarations. A 394 // default argument shall not be redefined by a later 395 // declaration (not even to the same value). 396 // 397 // C++ [dcl.fct.default]p6: 398 // Except for member functions of class templates, the default arguments 399 // in a member function definition that appears outside of the class 400 // definition are added to the set of default arguments provided by the 401 // member function declaration in the class definition. 402 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 403 ParmVarDecl *OldParam = Old->getParamDecl(p); 404 ParmVarDecl *NewParam = New->getParamDecl(p); 405 406 bool OldParamHasDfl = OldParam->hasDefaultArg(); 407 bool NewParamHasDfl = NewParam->hasDefaultArg(); 408 409 NamedDecl *ND = Old; 410 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 411 // Ignore default parameters of old decl if they are not in 412 // the same scope. 413 OldParamHasDfl = false; 414 415 if (OldParamHasDfl && NewParamHasDfl) { 416 417 unsigned DiagDefaultParamID = 418 diag::err_param_default_argument_redefinition; 419 420 // MSVC accepts that default parameters be redefined for member functions 421 // of template class. The new default parameter's value is ignored. 422 Invalid = true; 423 if (getLangOpts().MicrosoftExt) { 424 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 425 if (MD && MD->getParent()->getDescribedClassTemplate()) { 426 // Merge the old default argument into the new parameter. 427 NewParam->setHasInheritedDefaultArg(); 428 if (OldParam->hasUninstantiatedDefaultArg()) 429 NewParam->setUninstantiatedDefaultArg( 430 OldParam->getUninstantiatedDefaultArg()); 431 else 432 NewParam->setDefaultArg(OldParam->getInit()); 433 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 434 Invalid = false; 435 } 436 } 437 438 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 439 // hint here. Alternatively, we could walk the type-source information 440 // for NewParam to find the last source location in the type... but it 441 // isn't worth the effort right now. This is the kind of test case that 442 // is hard to get right: 443 // int f(int); 444 // void g(int (*fp)(int) = f); 445 // void g(int (*fp)(int) = &f); 446 Diag(NewParam->getLocation(), DiagDefaultParamID) 447 << NewParam->getDefaultArgRange(); 448 449 // Look for the function declaration where the default argument was 450 // actually written, which may be a declaration prior to Old. 451 for (FunctionDecl *Older = Old->getPreviousDecl(); 452 Older; Older = Older->getPreviousDecl()) { 453 if (!Older->getParamDecl(p)->hasDefaultArg()) 454 break; 455 456 OldParam = Older->getParamDecl(p); 457 } 458 459 Diag(OldParam->getLocation(), diag::note_previous_definition) 460 << OldParam->getDefaultArgRange(); 461 } else if (OldParamHasDfl) { 462 // Merge the old default argument into the new parameter. 463 // It's important to use getInit() here; getDefaultArg() 464 // strips off any top-level ExprWithCleanups. 465 NewParam->setHasInheritedDefaultArg(); 466 if (OldParam->hasUninstantiatedDefaultArg()) 467 NewParam->setUninstantiatedDefaultArg( 468 OldParam->getUninstantiatedDefaultArg()); 469 else 470 NewParam->setDefaultArg(OldParam->getInit()); 471 } else if (NewParamHasDfl) { 472 if (New->getDescribedFunctionTemplate()) { 473 // Paragraph 4, quoted above, only applies to non-template functions. 474 Diag(NewParam->getLocation(), 475 diag::err_param_default_argument_template_redecl) 476 << NewParam->getDefaultArgRange(); 477 Diag(Old->getLocation(), diag::note_template_prev_declaration) 478 << false; 479 } else if (New->getTemplateSpecializationKind() 480 != TSK_ImplicitInstantiation && 481 New->getTemplateSpecializationKind() != TSK_Undeclared) { 482 // C++ [temp.expr.spec]p21: 483 // Default function arguments shall not be specified in a declaration 484 // or a definition for one of the following explicit specializations: 485 // - the explicit specialization of a function template; 486 // - the explicit specialization of a member function template; 487 // - the explicit specialization of a member function of a class 488 // template where the class template specialization to which the 489 // member function specialization belongs is implicitly 490 // instantiated. 491 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 492 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 493 << New->getDeclName() 494 << NewParam->getDefaultArgRange(); 495 } else if (New->getDeclContext()->isDependentContext()) { 496 // C++ [dcl.fct.default]p6 (DR217): 497 // Default arguments for a member function of a class template shall 498 // be specified on the initial declaration of the member function 499 // within the class template. 500 // 501 // Reading the tea leaves a bit in DR217 and its reference to DR205 502 // leads me to the conclusion that one cannot add default function 503 // arguments for an out-of-line definition of a member function of a 504 // dependent type. 505 int WhichKind = 2; 506 if (CXXRecordDecl *Record 507 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 508 if (Record->getDescribedClassTemplate()) 509 WhichKind = 0; 510 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 511 WhichKind = 1; 512 else 513 WhichKind = 2; 514 } 515 516 Diag(NewParam->getLocation(), 517 diag::err_param_default_argument_member_template_redecl) 518 << WhichKind 519 << NewParam->getDefaultArgRange(); 520 } else if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(New)) { 521 CXXSpecialMember NewSM = getSpecialMember(Ctor), 522 OldSM = getSpecialMember(cast<CXXConstructorDecl>(Old)); 523 if (NewSM != OldSM) { 524 Diag(NewParam->getLocation(),diag::warn_default_arg_makes_ctor_special) 525 << NewParam->getDefaultArgRange() << NewSM; 526 Diag(Old->getLocation(), diag::note_previous_declaration_special) 527 << OldSM; 528 } 529 } 530 } 531 } 532 533 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 534 // template has a constexpr specifier then all its declarations shall 535 // contain the constexpr specifier. 536 if (New->isConstexpr() != Old->isConstexpr()) { 537 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 538 << New << New->isConstexpr(); 539 Diag(Old->getLocation(), diag::note_previous_declaration); 540 Invalid = true; 541 } 542 543 if (CheckEquivalentExceptionSpec(Old, New)) 544 Invalid = true; 545 546 return Invalid; 547} 548 549/// \brief Merge the exception specifications of two variable declarations. 550/// 551/// This is called when there's a redeclaration of a VarDecl. The function 552/// checks if the redeclaration might have an exception specification and 553/// validates compatibility and merges the specs if necessary. 554void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 555 // Shortcut if exceptions are disabled. 556 if (!getLangOpts().CXXExceptions) 557 return; 558 559 assert(Context.hasSameType(New->getType(), Old->getType()) && 560 "Should only be called if types are otherwise the same."); 561 562 QualType NewType = New->getType(); 563 QualType OldType = Old->getType(); 564 565 // We're only interested in pointers and references to functions, as well 566 // as pointers to member functions. 567 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 568 NewType = R->getPointeeType(); 569 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 570 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 571 NewType = P->getPointeeType(); 572 OldType = OldType->getAs<PointerType>()->getPointeeType(); 573 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 574 NewType = M->getPointeeType(); 575 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 576 } 577 578 if (!NewType->isFunctionProtoType()) 579 return; 580 581 // There's lots of special cases for functions. For function pointers, system 582 // libraries are hopefully not as broken so that we don't need these 583 // workarounds. 584 if (CheckEquivalentExceptionSpec( 585 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 586 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 587 New->setInvalidDecl(); 588 } 589} 590 591/// CheckCXXDefaultArguments - Verify that the default arguments for a 592/// function declaration are well-formed according to C++ 593/// [dcl.fct.default]. 594void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 595 unsigned NumParams = FD->getNumParams(); 596 unsigned p; 597 598 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 599 isa<CXXMethodDecl>(FD) && 600 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 601 602 // Find first parameter with a default argument 603 for (p = 0; p < NumParams; ++p) { 604 ParmVarDecl *Param = FD->getParamDecl(p); 605 if (Param->hasDefaultArg()) { 606 // C++11 [expr.prim.lambda]p5: 607 // [...] Default arguments (8.3.6) shall not be specified in the 608 // parameter-declaration-clause of a lambda-declarator. 609 // 610 // FIXME: Core issue 974 strikes this sentence, we only provide an 611 // extension warning. 612 if (IsLambda) 613 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 614 << Param->getDefaultArgRange(); 615 break; 616 } 617 } 618 619 // C++ [dcl.fct.default]p4: 620 // In a given function declaration, all parameters 621 // subsequent to a parameter with a default argument shall 622 // have default arguments supplied in this or previous 623 // declarations. A default argument shall not be redefined 624 // by a later declaration (not even to the same value). 625 unsigned LastMissingDefaultArg = 0; 626 for (; p < NumParams; ++p) { 627 ParmVarDecl *Param = FD->getParamDecl(p); 628 if (!Param->hasDefaultArg()) { 629 if (Param->isInvalidDecl()) 630 /* We already complained about this parameter. */; 631 else if (Param->getIdentifier()) 632 Diag(Param->getLocation(), 633 diag::err_param_default_argument_missing_name) 634 << Param->getIdentifier(); 635 else 636 Diag(Param->getLocation(), 637 diag::err_param_default_argument_missing); 638 639 LastMissingDefaultArg = p; 640 } 641 } 642 643 if (LastMissingDefaultArg > 0) { 644 // Some default arguments were missing. Clear out all of the 645 // default arguments up to (and including) the last missing 646 // default argument, so that we leave the function parameters 647 // in a semantically valid state. 648 for (p = 0; p <= LastMissingDefaultArg; ++p) { 649 ParmVarDecl *Param = FD->getParamDecl(p); 650 if (Param->hasDefaultArg()) { 651 Param->setDefaultArg(0); 652 } 653 } 654 } 655} 656 657// CheckConstexprParameterTypes - Check whether a function's parameter types 658// are all literal types. If so, return true. If not, produce a suitable 659// diagnostic and return false. 660static bool CheckConstexprParameterTypes(Sema &SemaRef, 661 const FunctionDecl *FD) { 662 unsigned ArgIndex = 0; 663 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 664 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 665 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 666 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 667 SourceLocation ParamLoc = PD->getLocation(); 668 if (!(*i)->isDependentType() && 669 SemaRef.RequireLiteralType(ParamLoc, *i, 670 diag::err_constexpr_non_literal_param, 671 ArgIndex+1, PD->getSourceRange(), 672 isa<CXXConstructorDecl>(FD))) 673 return false; 674 } 675 return true; 676} 677 678/// \brief Get diagnostic %select index for tag kind for 679/// record diagnostic message. 680/// WARNING: Indexes apply to particular diagnostics only! 681/// 682/// \returns diagnostic %select index. 683static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 684 switch (Tag) { 685 case TTK_Struct: return 0; 686 case TTK_Interface: return 1; 687 case TTK_Class: return 2; 688 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 689 } 690} 691 692// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 693// the requirements of a constexpr function definition or a constexpr 694// constructor definition. If so, return true. If not, produce appropriate 695// diagnostics and return false. 696// 697// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 698bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 699 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 700 if (MD && MD->isInstance()) { 701 // C++11 [dcl.constexpr]p4: 702 // The definition of a constexpr constructor shall satisfy the following 703 // constraints: 704 // - the class shall not have any virtual base classes; 705 const CXXRecordDecl *RD = MD->getParent(); 706 if (RD->getNumVBases()) { 707 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 708 << isa<CXXConstructorDecl>(NewFD) 709 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 710 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 711 E = RD->vbases_end(); I != E; ++I) 712 Diag(I->getLocStart(), 713 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 714 return false; 715 } 716 } 717 718 if (!isa<CXXConstructorDecl>(NewFD)) { 719 // C++11 [dcl.constexpr]p3: 720 // The definition of a constexpr function shall satisfy the following 721 // constraints: 722 // - it shall not be virtual; 723 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 724 if (Method && Method->isVirtual()) { 725 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 726 727 // If it's not obvious why this function is virtual, find an overridden 728 // function which uses the 'virtual' keyword. 729 const CXXMethodDecl *WrittenVirtual = Method; 730 while (!WrittenVirtual->isVirtualAsWritten()) 731 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 732 if (WrittenVirtual != Method) 733 Diag(WrittenVirtual->getLocation(), 734 diag::note_overridden_virtual_function); 735 return false; 736 } 737 738 // - its return type shall be a literal type; 739 QualType RT = NewFD->getResultType(); 740 if (!RT->isDependentType() && 741 RequireLiteralType(NewFD->getLocation(), RT, 742 diag::err_constexpr_non_literal_return)) 743 return false; 744 } 745 746 // - each of its parameter types shall be a literal type; 747 if (!CheckConstexprParameterTypes(*this, NewFD)) 748 return false; 749 750 return true; 751} 752 753/// Check the given declaration statement is legal within a constexpr function 754/// body. C++0x [dcl.constexpr]p3,p4. 755/// 756/// \return true if the body is OK, false if we have diagnosed a problem. 757static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 758 DeclStmt *DS) { 759 // C++0x [dcl.constexpr]p3 and p4: 760 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 761 // contain only 762 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 763 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 764 switch ((*DclIt)->getKind()) { 765 case Decl::StaticAssert: 766 case Decl::Using: 767 case Decl::UsingShadow: 768 case Decl::UsingDirective: 769 case Decl::UnresolvedUsingTypename: 770 // - static_assert-declarations 771 // - using-declarations, 772 // - using-directives, 773 continue; 774 775 case Decl::Typedef: 776 case Decl::TypeAlias: { 777 // - typedef declarations and alias-declarations that do not define 778 // classes or enumerations, 779 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 780 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 781 // Don't allow variably-modified types in constexpr functions. 782 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 783 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 784 << TL.getSourceRange() << TL.getType() 785 << isa<CXXConstructorDecl>(Dcl); 786 return false; 787 } 788 continue; 789 } 790 791 case Decl::Enum: 792 case Decl::CXXRecord: 793 // As an extension, we allow the declaration (but not the definition) of 794 // classes and enumerations in all declarations, not just in typedef and 795 // alias declarations. 796 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 797 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 798 << isa<CXXConstructorDecl>(Dcl); 799 return false; 800 } 801 continue; 802 803 case Decl::Var: 804 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 805 << isa<CXXConstructorDecl>(Dcl); 806 return false; 807 808 default: 809 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 810 << isa<CXXConstructorDecl>(Dcl); 811 return false; 812 } 813 } 814 815 return true; 816} 817 818/// Check that the given field is initialized within a constexpr constructor. 819/// 820/// \param Dcl The constexpr constructor being checked. 821/// \param Field The field being checked. This may be a member of an anonymous 822/// struct or union nested within the class being checked. 823/// \param Inits All declarations, including anonymous struct/union members and 824/// indirect members, for which any initialization was provided. 825/// \param Diagnosed Set to true if an error is produced. 826static void CheckConstexprCtorInitializer(Sema &SemaRef, 827 const FunctionDecl *Dcl, 828 FieldDecl *Field, 829 llvm::SmallSet<Decl*, 16> &Inits, 830 bool &Diagnosed) { 831 if (Field->isUnnamedBitfield()) 832 return; 833 834 if (Field->isAnonymousStructOrUnion() && 835 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 836 return; 837 838 if (!Inits.count(Field)) { 839 if (!Diagnosed) { 840 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 841 Diagnosed = true; 842 } 843 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 844 } else if (Field->isAnonymousStructOrUnion()) { 845 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 846 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 847 I != E; ++I) 848 // If an anonymous union contains an anonymous struct of which any member 849 // is initialized, all members must be initialized. 850 if (!RD->isUnion() || Inits.count(*I)) 851 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 852 } 853} 854 855/// Check the body for the given constexpr function declaration only contains 856/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 857/// 858/// \return true if the body is OK, false if we have diagnosed a problem. 859bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 860 if (isa<CXXTryStmt>(Body)) { 861 // C++11 [dcl.constexpr]p3: 862 // The definition of a constexpr function shall satisfy the following 863 // constraints: [...] 864 // - its function-body shall be = delete, = default, or a 865 // compound-statement 866 // 867 // C++11 [dcl.constexpr]p4: 868 // In the definition of a constexpr constructor, [...] 869 // - its function-body shall not be a function-try-block; 870 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 871 << isa<CXXConstructorDecl>(Dcl); 872 return false; 873 } 874 875 // - its function-body shall be [...] a compound-statement that contains only 876 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 877 878 llvm::SmallVector<SourceLocation, 4> ReturnStmts; 879 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 880 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 881 switch ((*BodyIt)->getStmtClass()) { 882 case Stmt::NullStmtClass: 883 // - null statements, 884 continue; 885 886 case Stmt::DeclStmtClass: 887 // - static_assert-declarations 888 // - using-declarations, 889 // - using-directives, 890 // - typedef declarations and alias-declarations that do not define 891 // classes or enumerations, 892 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 893 return false; 894 continue; 895 896 case Stmt::ReturnStmtClass: 897 // - and exactly one return statement; 898 if (isa<CXXConstructorDecl>(Dcl)) 899 break; 900 901 ReturnStmts.push_back((*BodyIt)->getLocStart()); 902 continue; 903 904 default: 905 break; 906 } 907 908 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 909 << isa<CXXConstructorDecl>(Dcl); 910 return false; 911 } 912 913 if (const CXXConstructorDecl *Constructor 914 = dyn_cast<CXXConstructorDecl>(Dcl)) { 915 const CXXRecordDecl *RD = Constructor->getParent(); 916 // DR1359: 917 // - every non-variant non-static data member and base class sub-object 918 // shall be initialized; 919 // - if the class is a non-empty union, or for each non-empty anonymous 920 // union member of a non-union class, exactly one non-static data member 921 // shall be initialized; 922 if (RD->isUnion()) { 923 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 924 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 925 return false; 926 } 927 } else if (!Constructor->isDependentContext() && 928 !Constructor->isDelegatingConstructor()) { 929 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 930 931 // Skip detailed checking if we have enough initializers, and we would 932 // allow at most one initializer per member. 933 bool AnyAnonStructUnionMembers = false; 934 unsigned Fields = 0; 935 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 936 E = RD->field_end(); I != E; ++I, ++Fields) { 937 if (I->isAnonymousStructOrUnion()) { 938 AnyAnonStructUnionMembers = true; 939 break; 940 } 941 } 942 if (AnyAnonStructUnionMembers || 943 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 944 // Check initialization of non-static data members. Base classes are 945 // always initialized so do not need to be checked. Dependent bases 946 // might not have initializers in the member initializer list. 947 llvm::SmallSet<Decl*, 16> Inits; 948 for (CXXConstructorDecl::init_const_iterator 949 I = Constructor->init_begin(), E = Constructor->init_end(); 950 I != E; ++I) { 951 if (FieldDecl *FD = (*I)->getMember()) 952 Inits.insert(FD); 953 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 954 Inits.insert(ID->chain_begin(), ID->chain_end()); 955 } 956 957 bool Diagnosed = false; 958 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 959 E = RD->field_end(); I != E; ++I) 960 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 961 if (Diagnosed) 962 return false; 963 } 964 } 965 } else { 966 if (ReturnStmts.empty()) { 967 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 968 return false; 969 } 970 if (ReturnStmts.size() > 1) { 971 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 972 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 973 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 974 return false; 975 } 976 } 977 978 // C++11 [dcl.constexpr]p5: 979 // if no function argument values exist such that the function invocation 980 // substitution would produce a constant expression, the program is 981 // ill-formed; no diagnostic required. 982 // C++11 [dcl.constexpr]p3: 983 // - every constructor call and implicit conversion used in initializing the 984 // return value shall be one of those allowed in a constant expression. 985 // C++11 [dcl.constexpr]p4: 986 // - every constructor involved in initializing non-static data members and 987 // base class sub-objects shall be a constexpr constructor. 988 llvm::SmallVector<PartialDiagnosticAt, 8> Diags; 989 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 990 Diag(Dcl->getLocation(), diag::err_constexpr_function_never_constant_expr) 991 << isa<CXXConstructorDecl>(Dcl); 992 for (size_t I = 0, N = Diags.size(); I != N; ++I) 993 Diag(Diags[I].first, Diags[I].second); 994 return false; 995 } 996 997 return true; 998} 999 1000/// isCurrentClassName - Determine whether the identifier II is the 1001/// name of the class type currently being defined. In the case of 1002/// nested classes, this will only return true if II is the name of 1003/// the innermost class. 1004bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1005 const CXXScopeSpec *SS) { 1006 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1007 1008 CXXRecordDecl *CurDecl; 1009 if (SS && SS->isSet() && !SS->isInvalid()) { 1010 DeclContext *DC = computeDeclContext(*SS, true); 1011 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1012 } else 1013 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1014 1015 if (CurDecl && CurDecl->getIdentifier()) 1016 return &II == CurDecl->getIdentifier(); 1017 else 1018 return false; 1019} 1020 1021/// \brief Determine whether the given class is a base class of the given 1022/// class, including looking at dependent bases. 1023static bool findCircularInheritance(const CXXRecordDecl *Class, 1024 const CXXRecordDecl *Current) { 1025 SmallVector<const CXXRecordDecl*, 8> Queue; 1026 1027 Class = Class->getCanonicalDecl(); 1028 while (true) { 1029 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1030 E = Current->bases_end(); 1031 I != E; ++I) { 1032 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1033 if (!Base) 1034 continue; 1035 1036 Base = Base->getDefinition(); 1037 if (!Base) 1038 continue; 1039 1040 if (Base->getCanonicalDecl() == Class) 1041 return true; 1042 1043 Queue.push_back(Base); 1044 } 1045 1046 if (Queue.empty()) 1047 return false; 1048 1049 Current = Queue.back(); 1050 Queue.pop_back(); 1051 } 1052 1053 return false; 1054} 1055 1056/// \brief Check the validity of a C++ base class specifier. 1057/// 1058/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1059/// and returns NULL otherwise. 1060CXXBaseSpecifier * 1061Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1062 SourceRange SpecifierRange, 1063 bool Virtual, AccessSpecifier Access, 1064 TypeSourceInfo *TInfo, 1065 SourceLocation EllipsisLoc) { 1066 QualType BaseType = TInfo->getType(); 1067 1068 // C++ [class.union]p1: 1069 // A union shall not have base classes. 1070 if (Class->isUnion()) { 1071 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1072 << SpecifierRange; 1073 return 0; 1074 } 1075 1076 if (EllipsisLoc.isValid() && 1077 !TInfo->getType()->containsUnexpandedParameterPack()) { 1078 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1079 << TInfo->getTypeLoc().getSourceRange(); 1080 EllipsisLoc = SourceLocation(); 1081 } 1082 1083 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1084 1085 if (BaseType->isDependentType()) { 1086 // Make sure that we don't have circular inheritance among our dependent 1087 // bases. For non-dependent bases, the check for completeness below handles 1088 // this. 1089 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1090 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1091 ((BaseDecl = BaseDecl->getDefinition()) && 1092 findCircularInheritance(Class, BaseDecl))) { 1093 Diag(BaseLoc, diag::err_circular_inheritance) 1094 << BaseType << Context.getTypeDeclType(Class); 1095 1096 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1097 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1098 << BaseType; 1099 1100 return 0; 1101 } 1102 } 1103 1104 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1105 Class->getTagKind() == TTK_Class, 1106 Access, TInfo, EllipsisLoc); 1107 } 1108 1109 // Base specifiers must be record types. 1110 if (!BaseType->isRecordType()) { 1111 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1112 return 0; 1113 } 1114 1115 // C++ [class.union]p1: 1116 // A union shall not be used as a base class. 1117 if (BaseType->isUnionType()) { 1118 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1119 return 0; 1120 } 1121 1122 // C++ [class.derived]p2: 1123 // The class-name in a base-specifier shall not be an incompletely 1124 // defined class. 1125 if (RequireCompleteType(BaseLoc, BaseType, 1126 diag::err_incomplete_base_class, SpecifierRange)) { 1127 Class->setInvalidDecl(); 1128 return 0; 1129 } 1130 1131 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1132 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1133 assert(BaseDecl && "Record type has no declaration"); 1134 BaseDecl = BaseDecl->getDefinition(); 1135 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1136 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1137 assert(CXXBaseDecl && "Base type is not a C++ type"); 1138 1139 // C++ [class]p3: 1140 // If a class is marked final and it appears as a base-type-specifier in 1141 // base-clause, the program is ill-formed. 1142 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1143 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1144 << CXXBaseDecl->getDeclName(); 1145 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1146 << CXXBaseDecl->getDeclName(); 1147 return 0; 1148 } 1149 1150 if (BaseDecl->isInvalidDecl()) 1151 Class->setInvalidDecl(); 1152 1153 // Create the base specifier. 1154 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1155 Class->getTagKind() == TTK_Class, 1156 Access, TInfo, EllipsisLoc); 1157} 1158 1159/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1160/// one entry in the base class list of a class specifier, for 1161/// example: 1162/// class foo : public bar, virtual private baz { 1163/// 'public bar' and 'virtual private baz' are each base-specifiers. 1164BaseResult 1165Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1166 bool Virtual, AccessSpecifier Access, 1167 ParsedType basetype, SourceLocation BaseLoc, 1168 SourceLocation EllipsisLoc) { 1169 if (!classdecl) 1170 return true; 1171 1172 AdjustDeclIfTemplate(classdecl); 1173 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1174 if (!Class) 1175 return true; 1176 1177 TypeSourceInfo *TInfo = 0; 1178 GetTypeFromParser(basetype, &TInfo); 1179 1180 if (EllipsisLoc.isInvalid() && 1181 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1182 UPPC_BaseType)) 1183 return true; 1184 1185 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1186 Virtual, Access, TInfo, 1187 EllipsisLoc)) 1188 return BaseSpec; 1189 else 1190 Class->setInvalidDecl(); 1191 1192 return true; 1193} 1194 1195/// \brief Performs the actual work of attaching the given base class 1196/// specifiers to a C++ class. 1197bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1198 unsigned NumBases) { 1199 if (NumBases == 0) 1200 return false; 1201 1202 // Used to keep track of which base types we have already seen, so 1203 // that we can properly diagnose redundant direct base types. Note 1204 // that the key is always the unqualified canonical type of the base 1205 // class. 1206 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1207 1208 // Copy non-redundant base specifiers into permanent storage. 1209 unsigned NumGoodBases = 0; 1210 bool Invalid = false; 1211 for (unsigned idx = 0; idx < NumBases; ++idx) { 1212 QualType NewBaseType 1213 = Context.getCanonicalType(Bases[idx]->getType()); 1214 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1215 1216 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1217 if (KnownBase) { 1218 // C++ [class.mi]p3: 1219 // A class shall not be specified as a direct base class of a 1220 // derived class more than once. 1221 Diag(Bases[idx]->getLocStart(), 1222 diag::err_duplicate_base_class) 1223 << KnownBase->getType() 1224 << Bases[idx]->getSourceRange(); 1225 1226 // Delete the duplicate base class specifier; we're going to 1227 // overwrite its pointer later. 1228 Context.Deallocate(Bases[idx]); 1229 1230 Invalid = true; 1231 } else { 1232 // Okay, add this new base class. 1233 KnownBase = Bases[idx]; 1234 Bases[NumGoodBases++] = Bases[idx]; 1235 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1236 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1237 if (Class->isInterface() && 1238 (!RD->isInterface() || 1239 KnownBase->getAccessSpecifier() != AS_public)) { 1240 // The Microsoft extension __interface does not permit bases that 1241 // are not themselves public interfaces. 1242 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1243 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1244 << RD->getSourceRange(); 1245 Invalid = true; 1246 } 1247 if (RD->hasAttr<WeakAttr>()) 1248 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1249 } 1250 } 1251 } 1252 1253 // Attach the remaining base class specifiers to the derived class. 1254 Class->setBases(Bases, NumGoodBases); 1255 1256 // Delete the remaining (good) base class specifiers, since their 1257 // data has been copied into the CXXRecordDecl. 1258 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1259 Context.Deallocate(Bases[idx]); 1260 1261 return Invalid; 1262} 1263 1264/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1265/// class, after checking whether there are any duplicate base 1266/// classes. 1267void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1268 unsigned NumBases) { 1269 if (!ClassDecl || !Bases || !NumBases) 1270 return; 1271 1272 AdjustDeclIfTemplate(ClassDecl); 1273 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1274 (CXXBaseSpecifier**)(Bases), NumBases); 1275} 1276 1277static CXXRecordDecl *GetClassForType(QualType T) { 1278 if (const RecordType *RT = T->getAs<RecordType>()) 1279 return cast<CXXRecordDecl>(RT->getDecl()); 1280 else if (const InjectedClassNameType *ICT = T->getAs<InjectedClassNameType>()) 1281 return ICT->getDecl(); 1282 else 1283 return 0; 1284} 1285 1286/// \brief Determine whether the type \p Derived is a C++ class that is 1287/// derived from the type \p Base. 1288bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1289 if (!getLangOpts().CPlusPlus) 1290 return false; 1291 1292 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1293 if (!DerivedRD) 1294 return false; 1295 1296 CXXRecordDecl *BaseRD = GetClassForType(Base); 1297 if (!BaseRD) 1298 return false; 1299 1300 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1301 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1302} 1303 1304/// \brief Determine whether the type \p Derived is a C++ class that is 1305/// derived from the type \p Base. 1306bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1307 if (!getLangOpts().CPlusPlus) 1308 return false; 1309 1310 CXXRecordDecl *DerivedRD = GetClassForType(Derived); 1311 if (!DerivedRD) 1312 return false; 1313 1314 CXXRecordDecl *BaseRD = GetClassForType(Base); 1315 if (!BaseRD) 1316 return false; 1317 1318 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1319} 1320 1321void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1322 CXXCastPath &BasePathArray) { 1323 assert(BasePathArray.empty() && "Base path array must be empty!"); 1324 assert(Paths.isRecordingPaths() && "Must record paths!"); 1325 1326 const CXXBasePath &Path = Paths.front(); 1327 1328 // We first go backward and check if we have a virtual base. 1329 // FIXME: It would be better if CXXBasePath had the base specifier for 1330 // the nearest virtual base. 1331 unsigned Start = 0; 1332 for (unsigned I = Path.size(); I != 0; --I) { 1333 if (Path[I - 1].Base->isVirtual()) { 1334 Start = I - 1; 1335 break; 1336 } 1337 } 1338 1339 // Now add all bases. 1340 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1341 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1342} 1343 1344/// \brief Determine whether the given base path includes a virtual 1345/// base class. 1346bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1347 for (CXXCastPath::const_iterator B = BasePath.begin(), 1348 BEnd = BasePath.end(); 1349 B != BEnd; ++B) 1350 if ((*B)->isVirtual()) 1351 return true; 1352 1353 return false; 1354} 1355 1356/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1357/// conversion (where Derived and Base are class types) is 1358/// well-formed, meaning that the conversion is unambiguous (and 1359/// that all of the base classes are accessible). Returns true 1360/// and emits a diagnostic if the code is ill-formed, returns false 1361/// otherwise. Loc is the location where this routine should point to 1362/// if there is an error, and Range is the source range to highlight 1363/// if there is an error. 1364bool 1365Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1366 unsigned InaccessibleBaseID, 1367 unsigned AmbigiousBaseConvID, 1368 SourceLocation Loc, SourceRange Range, 1369 DeclarationName Name, 1370 CXXCastPath *BasePath) { 1371 // First, determine whether the path from Derived to Base is 1372 // ambiguous. This is slightly more expensive than checking whether 1373 // the Derived to Base conversion exists, because here we need to 1374 // explore multiple paths to determine if there is an ambiguity. 1375 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1376 /*DetectVirtual=*/false); 1377 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1378 assert(DerivationOkay && 1379 "Can only be used with a derived-to-base conversion"); 1380 (void)DerivationOkay; 1381 1382 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1383 if (InaccessibleBaseID) { 1384 // Check that the base class can be accessed. 1385 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1386 InaccessibleBaseID)) { 1387 case AR_inaccessible: 1388 return true; 1389 case AR_accessible: 1390 case AR_dependent: 1391 case AR_delayed: 1392 break; 1393 } 1394 } 1395 1396 // Build a base path if necessary. 1397 if (BasePath) 1398 BuildBasePathArray(Paths, *BasePath); 1399 return false; 1400 } 1401 1402 // We know that the derived-to-base conversion is ambiguous, and 1403 // we're going to produce a diagnostic. Perform the derived-to-base 1404 // search just one more time to compute all of the possible paths so 1405 // that we can print them out. This is more expensive than any of 1406 // the previous derived-to-base checks we've done, but at this point 1407 // performance isn't as much of an issue. 1408 Paths.clear(); 1409 Paths.setRecordingPaths(true); 1410 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1411 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1412 (void)StillOkay; 1413 1414 // Build up a textual representation of the ambiguous paths, e.g., 1415 // D -> B -> A, that will be used to illustrate the ambiguous 1416 // conversions in the diagnostic. We only print one of the paths 1417 // to each base class subobject. 1418 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1419 1420 Diag(Loc, AmbigiousBaseConvID) 1421 << Derived << Base << PathDisplayStr << Range << Name; 1422 return true; 1423} 1424 1425bool 1426Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1427 SourceLocation Loc, SourceRange Range, 1428 CXXCastPath *BasePath, 1429 bool IgnoreAccess) { 1430 return CheckDerivedToBaseConversion(Derived, Base, 1431 IgnoreAccess ? 0 1432 : diag::err_upcast_to_inaccessible_base, 1433 diag::err_ambiguous_derived_to_base_conv, 1434 Loc, Range, DeclarationName(), 1435 BasePath); 1436} 1437 1438 1439/// @brief Builds a string representing ambiguous paths from a 1440/// specific derived class to different subobjects of the same base 1441/// class. 1442/// 1443/// This function builds a string that can be used in error messages 1444/// to show the different paths that one can take through the 1445/// inheritance hierarchy to go from the derived class to different 1446/// subobjects of a base class. The result looks something like this: 1447/// @code 1448/// struct D -> struct B -> struct A 1449/// struct D -> struct C -> struct A 1450/// @endcode 1451std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1452 std::string PathDisplayStr; 1453 std::set<unsigned> DisplayedPaths; 1454 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1455 Path != Paths.end(); ++Path) { 1456 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1457 // We haven't displayed a path to this particular base 1458 // class subobject yet. 1459 PathDisplayStr += "\n "; 1460 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1461 for (CXXBasePath::const_iterator Element = Path->begin(); 1462 Element != Path->end(); ++Element) 1463 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1464 } 1465 } 1466 1467 return PathDisplayStr; 1468} 1469 1470//===----------------------------------------------------------------------===// 1471// C++ class member Handling 1472//===----------------------------------------------------------------------===// 1473 1474/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1475bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1476 SourceLocation ASLoc, 1477 SourceLocation ColonLoc, 1478 AttributeList *Attrs) { 1479 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1480 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1481 ASLoc, ColonLoc); 1482 CurContext->addHiddenDecl(ASDecl); 1483 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1484} 1485 1486/// CheckOverrideControl - Check C++11 override control semantics. 1487void Sema::CheckOverrideControl(Decl *D) { 1488 if (D->isInvalidDecl()) 1489 return; 1490 1491 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1492 1493 // Do we know which functions this declaration might be overriding? 1494 bool OverridesAreKnown = !MD || 1495 (!MD->getParent()->hasAnyDependentBases() && 1496 !MD->getType()->isDependentType()); 1497 1498 if (!MD || !MD->isVirtual()) { 1499 if (OverridesAreKnown) { 1500 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1501 Diag(OA->getLocation(), 1502 diag::override_keyword_only_allowed_on_virtual_member_functions) 1503 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1504 D->dropAttr<OverrideAttr>(); 1505 } 1506 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1507 Diag(FA->getLocation(), 1508 diag::override_keyword_only_allowed_on_virtual_member_functions) 1509 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1510 D->dropAttr<FinalAttr>(); 1511 } 1512 } 1513 return; 1514 } 1515 1516 if (!OverridesAreKnown) 1517 return; 1518 1519 // C++11 [class.virtual]p5: 1520 // If a virtual function is marked with the virt-specifier override and 1521 // does not override a member function of a base class, the program is 1522 // ill-formed. 1523 bool HasOverriddenMethods = 1524 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1525 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1526 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1527 << MD->getDeclName(); 1528} 1529 1530/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1531/// function overrides a virtual member function marked 'final', according to 1532/// C++11 [class.virtual]p4. 1533bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1534 const CXXMethodDecl *Old) { 1535 if (!Old->hasAttr<FinalAttr>()) 1536 return false; 1537 1538 Diag(New->getLocation(), diag::err_final_function_overridden) 1539 << New->getDeclName(); 1540 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1541 return true; 1542} 1543 1544static bool InitializationHasSideEffects(const FieldDecl &FD) { 1545 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1546 // FIXME: Destruction of ObjC lifetime types has side-effects. 1547 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1548 return !RD->isCompleteDefinition() || 1549 !RD->hasTrivialDefaultConstructor() || 1550 !RD->hasTrivialDestructor(); 1551 return false; 1552} 1553 1554/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1555/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1556/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1557/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1558/// present (but parsing it has been deferred). 1559Decl * 1560Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1561 MultiTemplateParamsArg TemplateParameterLists, 1562 Expr *BW, const VirtSpecifiers &VS, 1563 InClassInitStyle InitStyle) { 1564 const DeclSpec &DS = D.getDeclSpec(); 1565 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1566 DeclarationName Name = NameInfo.getName(); 1567 SourceLocation Loc = NameInfo.getLoc(); 1568 1569 // For anonymous bitfields, the location should point to the type. 1570 if (Loc.isInvalid()) 1571 Loc = D.getLocStart(); 1572 1573 Expr *BitWidth = static_cast<Expr*>(BW); 1574 1575 assert(isa<CXXRecordDecl>(CurContext)); 1576 assert(!DS.isFriendSpecified()); 1577 1578 bool isFunc = D.isDeclarationOfFunction(); 1579 1580 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1581 // The Microsoft extension __interface only permits public member functions 1582 // and prohibits constructors, destructors, operators, non-public member 1583 // functions, static methods and data members. 1584 unsigned InvalidDecl; 1585 bool ShowDeclName = true; 1586 if (!isFunc) 1587 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1588 else if (AS != AS_public) 1589 InvalidDecl = 2; 1590 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1591 InvalidDecl = 3; 1592 else switch (Name.getNameKind()) { 1593 case DeclarationName::CXXConstructorName: 1594 InvalidDecl = 4; 1595 ShowDeclName = false; 1596 break; 1597 1598 case DeclarationName::CXXDestructorName: 1599 InvalidDecl = 5; 1600 ShowDeclName = false; 1601 break; 1602 1603 case DeclarationName::CXXOperatorName: 1604 case DeclarationName::CXXConversionFunctionName: 1605 InvalidDecl = 6; 1606 break; 1607 1608 default: 1609 InvalidDecl = 0; 1610 break; 1611 } 1612 1613 if (InvalidDecl) { 1614 if (ShowDeclName) 1615 Diag(Loc, diag::err_invalid_member_in_interface) 1616 << (InvalidDecl-1) << Name; 1617 else 1618 Diag(Loc, diag::err_invalid_member_in_interface) 1619 << (InvalidDecl-1) << ""; 1620 return 0; 1621 } 1622 } 1623 1624 // C++ 9.2p6: A member shall not be declared to have automatic storage 1625 // duration (auto, register) or with the extern storage-class-specifier. 1626 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1627 // data members and cannot be applied to names declared const or static, 1628 // and cannot be applied to reference members. 1629 switch (DS.getStorageClassSpec()) { 1630 case DeclSpec::SCS_unspecified: 1631 case DeclSpec::SCS_typedef: 1632 case DeclSpec::SCS_static: 1633 // FALL THROUGH. 1634 break; 1635 case DeclSpec::SCS_mutable: 1636 if (isFunc) { 1637 if (DS.getStorageClassSpecLoc().isValid()) 1638 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1639 else 1640 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1641 1642 // FIXME: It would be nicer if the keyword was ignored only for this 1643 // declarator. Otherwise we could get follow-up errors. 1644 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1645 } 1646 break; 1647 default: 1648 if (DS.getStorageClassSpecLoc().isValid()) 1649 Diag(DS.getStorageClassSpecLoc(), 1650 diag::err_storageclass_invalid_for_member); 1651 else 1652 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1653 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1654 } 1655 1656 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1657 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1658 !isFunc); 1659 1660 Decl *Member; 1661 if (isInstField) { 1662 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1663 1664 // Data members must have identifiers for names. 1665 if (!Name.isIdentifier()) { 1666 Diag(Loc, diag::err_bad_variable_name) 1667 << Name; 1668 return 0; 1669 } 1670 1671 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1672 1673 // Member field could not be with "template" keyword. 1674 // So TemplateParameterLists should be empty in this case. 1675 if (TemplateParameterLists.size()) { 1676 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1677 if (TemplateParams->size()) { 1678 // There is no such thing as a member field template. 1679 Diag(D.getIdentifierLoc(), diag::err_template_member) 1680 << II 1681 << SourceRange(TemplateParams->getTemplateLoc(), 1682 TemplateParams->getRAngleLoc()); 1683 } else { 1684 // There is an extraneous 'template<>' for this member. 1685 Diag(TemplateParams->getTemplateLoc(), 1686 diag::err_template_member_noparams) 1687 << II 1688 << SourceRange(TemplateParams->getTemplateLoc(), 1689 TemplateParams->getRAngleLoc()); 1690 } 1691 return 0; 1692 } 1693 1694 if (SS.isSet() && !SS.isInvalid()) { 1695 // The user provided a superfluous scope specifier inside a class 1696 // definition: 1697 // 1698 // class X { 1699 // int X::member; 1700 // }; 1701 if (DeclContext *DC = computeDeclContext(SS, false)) 1702 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1703 else 1704 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1705 << Name << SS.getRange(); 1706 1707 SS.clear(); 1708 } 1709 1710 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1711 InitStyle, AS); 1712 assert(Member && "HandleField never returns null"); 1713 } else { 1714 assert(InitStyle == ICIS_NoInit); 1715 1716 Member = HandleDeclarator(S, D, TemplateParameterLists); 1717 if (!Member) { 1718 return 0; 1719 } 1720 1721 // Non-instance-fields can't have a bitfield. 1722 if (BitWidth) { 1723 if (Member->isInvalidDecl()) { 1724 // don't emit another diagnostic. 1725 } else if (isa<VarDecl>(Member)) { 1726 // C++ 9.6p3: A bit-field shall not be a static member. 1727 // "static member 'A' cannot be a bit-field" 1728 Diag(Loc, diag::err_static_not_bitfield) 1729 << Name << BitWidth->getSourceRange(); 1730 } else if (isa<TypedefDecl>(Member)) { 1731 // "typedef member 'x' cannot be a bit-field" 1732 Diag(Loc, diag::err_typedef_not_bitfield) 1733 << Name << BitWidth->getSourceRange(); 1734 } else { 1735 // A function typedef ("typedef int f(); f a;"). 1736 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1737 Diag(Loc, diag::err_not_integral_type_bitfield) 1738 << Name << cast<ValueDecl>(Member)->getType() 1739 << BitWidth->getSourceRange(); 1740 } 1741 1742 BitWidth = 0; 1743 Member->setInvalidDecl(); 1744 } 1745 1746 Member->setAccess(AS); 1747 1748 // If we have declared a member function template, set the access of the 1749 // templated declaration as well. 1750 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1751 FunTmpl->getTemplatedDecl()->setAccess(AS); 1752 } 1753 1754 if (VS.isOverrideSpecified()) 1755 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1756 if (VS.isFinalSpecified()) 1757 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1758 1759 if (VS.getLastLocation().isValid()) { 1760 // Update the end location of a method that has a virt-specifiers. 1761 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1762 MD->setRangeEnd(VS.getLastLocation()); 1763 } 1764 1765 CheckOverrideControl(Member); 1766 1767 assert((Name || isInstField) && "No identifier for non-field ?"); 1768 1769 if (isInstField) { 1770 FieldDecl *FD = cast<FieldDecl>(Member); 1771 FieldCollector->Add(FD); 1772 1773 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1774 FD->getLocation()) 1775 != DiagnosticsEngine::Ignored) { 1776 // Remember all explicit private FieldDecls that have a name, no side 1777 // effects and are not part of a dependent type declaration. 1778 if (!FD->isImplicit() && FD->getDeclName() && 1779 FD->getAccess() == AS_private && 1780 !FD->hasAttr<UnusedAttr>() && 1781 !FD->getParent()->isDependentContext() && 1782 !InitializationHasSideEffects(*FD)) 1783 UnusedPrivateFields.insert(FD); 1784 } 1785 } 1786 1787 return Member; 1788} 1789 1790namespace { 1791 class UninitializedFieldVisitor 1792 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1793 Sema &S; 1794 ValueDecl *VD; 1795 public: 1796 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1797 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1798 S(S) { 1799 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1800 this->VD = IFD->getAnonField(); 1801 else 1802 this->VD = VD; 1803 } 1804 1805 void HandleExpr(Expr *E) { 1806 if (!E) return; 1807 1808 // Expressions like x(x) sometimes lack the surrounding expressions 1809 // but need to be checked anyways. 1810 HandleValue(E); 1811 Visit(E); 1812 } 1813 1814 void HandleValue(Expr *E) { 1815 E = E->IgnoreParens(); 1816 1817 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1818 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1819 return; 1820 1821 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1822 // or union. 1823 MemberExpr *FieldME = ME; 1824 1825 Expr *Base = E; 1826 while (isa<MemberExpr>(Base)) { 1827 ME = cast<MemberExpr>(Base); 1828 1829 if (isa<VarDecl>(ME->getMemberDecl())) 1830 return; 1831 1832 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1833 if (!FD->isAnonymousStructOrUnion()) 1834 FieldME = ME; 1835 1836 Base = ME->getBase(); 1837 } 1838 1839 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1840 unsigned diag = VD->getType()->isReferenceType() 1841 ? diag::warn_reference_field_is_uninit 1842 : diag::warn_field_is_uninit; 1843 S.Diag(FieldME->getExprLoc(), diag) << VD; 1844 } 1845 return; 1846 } 1847 1848 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1849 HandleValue(CO->getTrueExpr()); 1850 HandleValue(CO->getFalseExpr()); 1851 return; 1852 } 1853 1854 if (BinaryConditionalOperator *BCO = 1855 dyn_cast<BinaryConditionalOperator>(E)) { 1856 HandleValue(BCO->getCommon()); 1857 HandleValue(BCO->getFalseExpr()); 1858 return; 1859 } 1860 1861 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1862 switch (BO->getOpcode()) { 1863 default: 1864 return; 1865 case(BO_PtrMemD): 1866 case(BO_PtrMemI): 1867 HandleValue(BO->getLHS()); 1868 return; 1869 case(BO_Comma): 1870 HandleValue(BO->getRHS()); 1871 return; 1872 } 1873 } 1874 } 1875 1876 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1877 if (E->getCastKind() == CK_LValueToRValue) 1878 HandleValue(E->getSubExpr()); 1879 1880 Inherited::VisitImplicitCastExpr(E); 1881 } 1882 1883 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1884 Expr *Callee = E->getCallee(); 1885 if (isa<MemberExpr>(Callee)) 1886 HandleValue(Callee); 1887 1888 Inherited::VisitCXXMemberCallExpr(E); 1889 } 1890 }; 1891 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1892 ValueDecl *VD) { 1893 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1894 } 1895} // namespace 1896 1897/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1898/// in-class initializer for a non-static C++ class member, and after 1899/// instantiating an in-class initializer in a class template. Such actions 1900/// are deferred until the class is complete. 1901void 1902Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1903 Expr *InitExpr) { 1904 FieldDecl *FD = cast<FieldDecl>(D); 1905 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1906 "must set init style when field is created"); 1907 1908 if (!InitExpr) { 1909 FD->setInvalidDecl(); 1910 FD->removeInClassInitializer(); 1911 return; 1912 } 1913 1914 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1915 FD->setInvalidDecl(); 1916 FD->removeInClassInitializer(); 1917 return; 1918 } 1919 1920 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1921 != DiagnosticsEngine::Ignored) { 1922 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1923 } 1924 1925 ExprResult Init = InitExpr; 1926 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent() && 1927 !FD->getDeclContext()->isDependentContext()) { 1928 // Note: We don't type-check when we're in a dependent context, because 1929 // the initialization-substitution code does not properly handle direct 1930 // list initialization. We have the same hackaround for ctor-initializers. 1931 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1932 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1933 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1934 } 1935 Expr **Inits = &InitExpr; 1936 unsigned NumInits = 1; 1937 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1938 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1939 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1940 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1941 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 1942 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 1943 if (Init.isInvalid()) { 1944 FD->setInvalidDecl(); 1945 return; 1946 } 1947 1948 CheckImplicitConversions(Init.get(), InitLoc); 1949 } 1950 1951 // C++0x [class.base.init]p7: 1952 // The initialization of each base and member constitutes a 1953 // full-expression. 1954 Init = MaybeCreateExprWithCleanups(Init); 1955 if (Init.isInvalid()) { 1956 FD->setInvalidDecl(); 1957 return; 1958 } 1959 1960 InitExpr = Init.release(); 1961 1962 FD->setInClassInitializer(InitExpr); 1963} 1964 1965/// \brief Find the direct and/or virtual base specifiers that 1966/// correspond to the given base type, for use in base initialization 1967/// within a constructor. 1968static bool FindBaseInitializer(Sema &SemaRef, 1969 CXXRecordDecl *ClassDecl, 1970 QualType BaseType, 1971 const CXXBaseSpecifier *&DirectBaseSpec, 1972 const CXXBaseSpecifier *&VirtualBaseSpec) { 1973 // First, check for a direct base class. 1974 DirectBaseSpec = 0; 1975 for (CXXRecordDecl::base_class_const_iterator Base 1976 = ClassDecl->bases_begin(); 1977 Base != ClassDecl->bases_end(); ++Base) { 1978 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 1979 // We found a direct base of this type. That's what we're 1980 // initializing. 1981 DirectBaseSpec = &*Base; 1982 break; 1983 } 1984 } 1985 1986 // Check for a virtual base class. 1987 // FIXME: We might be able to short-circuit this if we know in advance that 1988 // there are no virtual bases. 1989 VirtualBaseSpec = 0; 1990 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 1991 // We haven't found a base yet; search the class hierarchy for a 1992 // virtual base class. 1993 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1994 /*DetectVirtual=*/false); 1995 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 1996 BaseType, Paths)) { 1997 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1998 Path != Paths.end(); ++Path) { 1999 if (Path->back().Base->isVirtual()) { 2000 VirtualBaseSpec = Path->back().Base; 2001 break; 2002 } 2003 } 2004 } 2005 } 2006 2007 return DirectBaseSpec || VirtualBaseSpec; 2008} 2009 2010/// \brief Handle a C++ member initializer using braced-init-list syntax. 2011MemInitResult 2012Sema::ActOnMemInitializer(Decl *ConstructorD, 2013 Scope *S, 2014 CXXScopeSpec &SS, 2015 IdentifierInfo *MemberOrBase, 2016 ParsedType TemplateTypeTy, 2017 const DeclSpec &DS, 2018 SourceLocation IdLoc, 2019 Expr *InitList, 2020 SourceLocation EllipsisLoc) { 2021 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2022 DS, IdLoc, InitList, 2023 EllipsisLoc); 2024} 2025 2026/// \brief Handle a C++ member initializer using parentheses syntax. 2027MemInitResult 2028Sema::ActOnMemInitializer(Decl *ConstructorD, 2029 Scope *S, 2030 CXXScopeSpec &SS, 2031 IdentifierInfo *MemberOrBase, 2032 ParsedType TemplateTypeTy, 2033 const DeclSpec &DS, 2034 SourceLocation IdLoc, 2035 SourceLocation LParenLoc, 2036 Expr **Args, unsigned NumArgs, 2037 SourceLocation RParenLoc, 2038 SourceLocation EllipsisLoc) { 2039 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2040 llvm::makeArrayRef(Args, NumArgs), 2041 RParenLoc); 2042 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2043 DS, IdLoc, List, EllipsisLoc); 2044} 2045 2046namespace { 2047 2048// Callback to only accept typo corrections that can be a valid C++ member 2049// intializer: either a non-static field member or a base class. 2050class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2051 public: 2052 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2053 : ClassDecl(ClassDecl) {} 2054 2055 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2056 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2057 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2058 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2059 else 2060 return isa<TypeDecl>(ND); 2061 } 2062 return false; 2063 } 2064 2065 private: 2066 CXXRecordDecl *ClassDecl; 2067}; 2068 2069} 2070 2071/// \brief Handle a C++ member initializer. 2072MemInitResult 2073Sema::BuildMemInitializer(Decl *ConstructorD, 2074 Scope *S, 2075 CXXScopeSpec &SS, 2076 IdentifierInfo *MemberOrBase, 2077 ParsedType TemplateTypeTy, 2078 const DeclSpec &DS, 2079 SourceLocation IdLoc, 2080 Expr *Init, 2081 SourceLocation EllipsisLoc) { 2082 if (!ConstructorD) 2083 return true; 2084 2085 AdjustDeclIfTemplate(ConstructorD); 2086 2087 CXXConstructorDecl *Constructor 2088 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2089 if (!Constructor) { 2090 // The user wrote a constructor initializer on a function that is 2091 // not a C++ constructor. Ignore the error for now, because we may 2092 // have more member initializers coming; we'll diagnose it just 2093 // once in ActOnMemInitializers. 2094 return true; 2095 } 2096 2097 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2098 2099 // C++ [class.base.init]p2: 2100 // Names in a mem-initializer-id are looked up in the scope of the 2101 // constructor's class and, if not found in that scope, are looked 2102 // up in the scope containing the constructor's definition. 2103 // [Note: if the constructor's class contains a member with the 2104 // same name as a direct or virtual base class of the class, a 2105 // mem-initializer-id naming the member or base class and composed 2106 // of a single identifier refers to the class member. A 2107 // mem-initializer-id for the hidden base class may be specified 2108 // using a qualified name. ] 2109 if (!SS.getScopeRep() && !TemplateTypeTy) { 2110 // Look for a member, first. 2111 DeclContext::lookup_result Result 2112 = ClassDecl->lookup(MemberOrBase); 2113 if (Result.first != Result.second) { 2114 ValueDecl *Member; 2115 if ((Member = dyn_cast<FieldDecl>(*Result.first)) || 2116 (Member = dyn_cast<IndirectFieldDecl>(*Result.first))) { 2117 if (EllipsisLoc.isValid()) 2118 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2119 << MemberOrBase 2120 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2121 2122 return BuildMemberInitializer(Member, Init, IdLoc); 2123 } 2124 } 2125 } 2126 // It didn't name a member, so see if it names a class. 2127 QualType BaseType; 2128 TypeSourceInfo *TInfo = 0; 2129 2130 if (TemplateTypeTy) { 2131 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2132 } else if (DS.getTypeSpecType() == TST_decltype) { 2133 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2134 } else { 2135 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2136 LookupParsedName(R, S, &SS); 2137 2138 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2139 if (!TyD) { 2140 if (R.isAmbiguous()) return true; 2141 2142 // We don't want access-control diagnostics here. 2143 R.suppressDiagnostics(); 2144 2145 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2146 bool NotUnknownSpecialization = false; 2147 DeclContext *DC = computeDeclContext(SS, false); 2148 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2149 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2150 2151 if (!NotUnknownSpecialization) { 2152 // When the scope specifier can refer to a member of an unknown 2153 // specialization, we take it as a type name. 2154 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2155 SS.getWithLocInContext(Context), 2156 *MemberOrBase, IdLoc); 2157 if (BaseType.isNull()) 2158 return true; 2159 2160 R.clear(); 2161 R.setLookupName(MemberOrBase); 2162 } 2163 } 2164 2165 // If no results were found, try to correct typos. 2166 TypoCorrection Corr; 2167 MemInitializerValidatorCCC Validator(ClassDecl); 2168 if (R.empty() && BaseType.isNull() && 2169 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2170 Validator, ClassDecl))) { 2171 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2172 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2173 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2174 // We have found a non-static data member with a similar 2175 // name to what was typed; complain and initialize that 2176 // member. 2177 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2178 << MemberOrBase << true << CorrectedQuotedStr 2179 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2180 Diag(Member->getLocation(), diag::note_previous_decl) 2181 << CorrectedQuotedStr; 2182 2183 return BuildMemberInitializer(Member, Init, IdLoc); 2184 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2185 const CXXBaseSpecifier *DirectBaseSpec; 2186 const CXXBaseSpecifier *VirtualBaseSpec; 2187 if (FindBaseInitializer(*this, ClassDecl, 2188 Context.getTypeDeclType(Type), 2189 DirectBaseSpec, VirtualBaseSpec)) { 2190 // We have found a direct or virtual base class with a 2191 // similar name to what was typed; complain and initialize 2192 // that base class. 2193 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2194 << MemberOrBase << false << CorrectedQuotedStr 2195 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2196 2197 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2198 : VirtualBaseSpec; 2199 Diag(BaseSpec->getLocStart(), 2200 diag::note_base_class_specified_here) 2201 << BaseSpec->getType() 2202 << BaseSpec->getSourceRange(); 2203 2204 TyD = Type; 2205 } 2206 } 2207 } 2208 2209 if (!TyD && BaseType.isNull()) { 2210 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2211 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2212 return true; 2213 } 2214 } 2215 2216 if (BaseType.isNull()) { 2217 BaseType = Context.getTypeDeclType(TyD); 2218 if (SS.isSet()) { 2219 NestedNameSpecifier *Qualifier = 2220 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2221 2222 // FIXME: preserve source range information 2223 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2224 } 2225 } 2226 } 2227 2228 if (!TInfo) 2229 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2230 2231 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2232} 2233 2234/// Checks a member initializer expression for cases where reference (or 2235/// pointer) members are bound to by-value parameters (or their addresses). 2236static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2237 Expr *Init, 2238 SourceLocation IdLoc) { 2239 QualType MemberTy = Member->getType(); 2240 2241 // We only handle pointers and references currently. 2242 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2243 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2244 return; 2245 2246 const bool IsPointer = MemberTy->isPointerType(); 2247 if (IsPointer) { 2248 if (const UnaryOperator *Op 2249 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2250 // The only case we're worried about with pointers requires taking the 2251 // address. 2252 if (Op->getOpcode() != UO_AddrOf) 2253 return; 2254 2255 Init = Op->getSubExpr(); 2256 } else { 2257 // We only handle address-of expression initializers for pointers. 2258 return; 2259 } 2260 } 2261 2262 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2263 // Taking the address of a temporary will be diagnosed as a hard error. 2264 if (IsPointer) 2265 return; 2266 2267 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2268 << Member << Init->getSourceRange(); 2269 } else if (const DeclRefExpr *DRE 2270 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2271 // We only warn when referring to a non-reference parameter declaration. 2272 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2273 if (!Parameter || Parameter->getType()->isReferenceType()) 2274 return; 2275 2276 S.Diag(Init->getExprLoc(), 2277 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2278 : diag::warn_bind_ref_member_to_parameter) 2279 << Member << Parameter << Init->getSourceRange(); 2280 } else { 2281 // Other initializers are fine. 2282 return; 2283 } 2284 2285 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2286 << (unsigned)IsPointer; 2287} 2288 2289MemInitResult 2290Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2291 SourceLocation IdLoc) { 2292 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2293 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2294 assert((DirectMember || IndirectMember) && 2295 "Member must be a FieldDecl or IndirectFieldDecl"); 2296 2297 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2298 return true; 2299 2300 if (Member->isInvalidDecl()) 2301 return true; 2302 2303 // Diagnose value-uses of fields to initialize themselves, e.g. 2304 // foo(foo) 2305 // where foo is not also a parameter to the constructor. 2306 // TODO: implement -Wuninitialized and fold this into that framework. 2307 Expr **Args; 2308 unsigned NumArgs; 2309 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2310 Args = ParenList->getExprs(); 2311 NumArgs = ParenList->getNumExprs(); 2312 } else { 2313 InitListExpr *InitList = cast<InitListExpr>(Init); 2314 Args = InitList->getInits(); 2315 NumArgs = InitList->getNumInits(); 2316 } 2317 2318 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2319 != DiagnosticsEngine::Ignored) 2320 for (unsigned i = 0; i < NumArgs; ++i) 2321 // FIXME: Warn about the case when other fields are used before being 2322 // initialized. For example, let this field be the i'th field. When 2323 // initializing the i'th field, throw a warning if any of the >= i'th 2324 // fields are used, as they are not yet initialized. 2325 // Right now we are only handling the case where the i'th field uses 2326 // itself in its initializer. 2327 // Also need to take into account that some fields may be initialized by 2328 // in-class initializers, see C++11 [class.base.init]p9. 2329 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2330 2331 SourceRange InitRange = Init->getSourceRange(); 2332 2333 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2334 // Can't check initialization for a member of dependent type or when 2335 // any of the arguments are type-dependent expressions. 2336 DiscardCleanupsInEvaluationContext(); 2337 } else { 2338 bool InitList = false; 2339 if (isa<InitListExpr>(Init)) { 2340 InitList = true; 2341 Args = &Init; 2342 NumArgs = 1; 2343 2344 if (isStdInitializerList(Member->getType(), 0)) { 2345 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2346 << /*at end of ctor*/1 << InitRange; 2347 } 2348 } 2349 2350 // Initialize the member. 2351 InitializedEntity MemberEntity = 2352 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2353 : InitializedEntity::InitializeMember(IndirectMember, 0); 2354 InitializationKind Kind = 2355 InitList ? InitializationKind::CreateDirectList(IdLoc) 2356 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2357 InitRange.getEnd()); 2358 2359 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2360 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2361 MultiExprArg(Args, NumArgs), 2362 0); 2363 if (MemberInit.isInvalid()) 2364 return true; 2365 2366 CheckImplicitConversions(MemberInit.get(), 2367 InitRange.getBegin()); 2368 2369 // C++0x [class.base.init]p7: 2370 // The initialization of each base and member constitutes a 2371 // full-expression. 2372 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 2373 if (MemberInit.isInvalid()) 2374 return true; 2375 2376 // If we are in a dependent context, template instantiation will 2377 // perform this type-checking again. Just save the arguments that we 2378 // received. 2379 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2380 // of the information that we have about the member 2381 // initializer. However, deconstructing the ASTs is a dicey process, 2382 // and this approach is far more likely to get the corner cases right. 2383 if (CurContext->isDependentContext()) { 2384 // The existing Init will do fine. 2385 } else { 2386 Init = MemberInit.get(); 2387 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2388 } 2389 } 2390 2391 if (DirectMember) { 2392 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2393 InitRange.getBegin(), Init, 2394 InitRange.getEnd()); 2395 } else { 2396 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2397 InitRange.getBegin(), Init, 2398 InitRange.getEnd()); 2399 } 2400} 2401 2402MemInitResult 2403Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2404 CXXRecordDecl *ClassDecl) { 2405 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2406 if (!LangOpts.CPlusPlus0x) 2407 return Diag(NameLoc, diag::err_delegating_ctor) 2408 << TInfo->getTypeLoc().getLocalSourceRange(); 2409 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2410 2411 bool InitList = true; 2412 Expr **Args = &Init; 2413 unsigned NumArgs = 1; 2414 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2415 InitList = false; 2416 Args = ParenList->getExprs(); 2417 NumArgs = ParenList->getNumExprs(); 2418 } 2419 2420 SourceRange InitRange = Init->getSourceRange(); 2421 // Initialize the object. 2422 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2423 QualType(ClassDecl->getTypeForDecl(), 0)); 2424 InitializationKind Kind = 2425 InitList ? InitializationKind::CreateDirectList(NameLoc) 2426 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2427 InitRange.getEnd()); 2428 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2429 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2430 MultiExprArg(Args, NumArgs), 2431 0); 2432 if (DelegationInit.isInvalid()) 2433 return true; 2434 2435 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2436 "Delegating constructor with no target?"); 2437 2438 CheckImplicitConversions(DelegationInit.get(), InitRange.getBegin()); 2439 2440 // C++0x [class.base.init]p7: 2441 // The initialization of each base and member constitutes a 2442 // full-expression. 2443 DelegationInit = MaybeCreateExprWithCleanups(DelegationInit); 2444 if (DelegationInit.isInvalid()) 2445 return true; 2446 2447 // If we are in a dependent context, template instantiation will 2448 // perform this type-checking again. Just save the arguments that we 2449 // received in a ParenListExpr. 2450 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2451 // of the information that we have about the base 2452 // initializer. However, deconstructing the ASTs is a dicey process, 2453 // and this approach is far more likely to get the corner cases right. 2454 if (CurContext->isDependentContext()) 2455 DelegationInit = Owned(Init); 2456 2457 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2458 DelegationInit.takeAs<Expr>(), 2459 InitRange.getEnd()); 2460} 2461 2462MemInitResult 2463Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2464 Expr *Init, CXXRecordDecl *ClassDecl, 2465 SourceLocation EllipsisLoc) { 2466 SourceLocation BaseLoc 2467 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2468 2469 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2470 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2471 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2472 2473 // C++ [class.base.init]p2: 2474 // [...] Unless the mem-initializer-id names a nonstatic data 2475 // member of the constructor's class or a direct or virtual base 2476 // of that class, the mem-initializer is ill-formed. A 2477 // mem-initializer-list can initialize a base class using any 2478 // name that denotes that base class type. 2479 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2480 2481 SourceRange InitRange = Init->getSourceRange(); 2482 if (EllipsisLoc.isValid()) { 2483 // This is a pack expansion. 2484 if (!BaseType->containsUnexpandedParameterPack()) { 2485 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2486 << SourceRange(BaseLoc, InitRange.getEnd()); 2487 2488 EllipsisLoc = SourceLocation(); 2489 } 2490 } else { 2491 // Check for any unexpanded parameter packs. 2492 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2493 return true; 2494 2495 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2496 return true; 2497 } 2498 2499 // Check for direct and virtual base classes. 2500 const CXXBaseSpecifier *DirectBaseSpec = 0; 2501 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2502 if (!Dependent) { 2503 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2504 BaseType)) 2505 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2506 2507 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2508 VirtualBaseSpec); 2509 2510 // C++ [base.class.init]p2: 2511 // Unless the mem-initializer-id names a nonstatic data member of the 2512 // constructor's class or a direct or virtual base of that class, the 2513 // mem-initializer is ill-formed. 2514 if (!DirectBaseSpec && !VirtualBaseSpec) { 2515 // If the class has any dependent bases, then it's possible that 2516 // one of those types will resolve to the same type as 2517 // BaseType. Therefore, just treat this as a dependent base 2518 // class initialization. FIXME: Should we try to check the 2519 // initialization anyway? It seems odd. 2520 if (ClassDecl->hasAnyDependentBases()) 2521 Dependent = true; 2522 else 2523 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2524 << BaseType << Context.getTypeDeclType(ClassDecl) 2525 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2526 } 2527 } 2528 2529 if (Dependent) { 2530 DiscardCleanupsInEvaluationContext(); 2531 2532 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2533 /*IsVirtual=*/false, 2534 InitRange.getBegin(), Init, 2535 InitRange.getEnd(), EllipsisLoc); 2536 } 2537 2538 // C++ [base.class.init]p2: 2539 // If a mem-initializer-id is ambiguous because it designates both 2540 // a direct non-virtual base class and an inherited virtual base 2541 // class, the mem-initializer is ill-formed. 2542 if (DirectBaseSpec && VirtualBaseSpec) 2543 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2544 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2545 2546 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2547 if (!BaseSpec) 2548 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2549 2550 // Initialize the base. 2551 bool InitList = true; 2552 Expr **Args = &Init; 2553 unsigned NumArgs = 1; 2554 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2555 InitList = false; 2556 Args = ParenList->getExprs(); 2557 NumArgs = ParenList->getNumExprs(); 2558 } 2559 2560 InitializedEntity BaseEntity = 2561 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2562 InitializationKind Kind = 2563 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2564 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2565 InitRange.getEnd()); 2566 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2567 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2568 MultiExprArg(Args, NumArgs), 0); 2569 if (BaseInit.isInvalid()) 2570 return true; 2571 2572 CheckImplicitConversions(BaseInit.get(), InitRange.getBegin()); 2573 2574 // C++0x [class.base.init]p7: 2575 // The initialization of each base and member constitutes a 2576 // full-expression. 2577 BaseInit = MaybeCreateExprWithCleanups(BaseInit); 2578 if (BaseInit.isInvalid()) 2579 return true; 2580 2581 // If we are in a dependent context, template instantiation will 2582 // perform this type-checking again. Just save the arguments that we 2583 // received in a ParenListExpr. 2584 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2585 // of the information that we have about the base 2586 // initializer. However, deconstructing the ASTs is a dicey process, 2587 // and this approach is far more likely to get the corner cases right. 2588 if (CurContext->isDependentContext()) 2589 BaseInit = Owned(Init); 2590 2591 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2592 BaseSpec->isVirtual(), 2593 InitRange.getBegin(), 2594 BaseInit.takeAs<Expr>(), 2595 InitRange.getEnd(), EllipsisLoc); 2596} 2597 2598// Create a static_cast\<T&&>(expr). 2599static Expr *CastForMoving(Sema &SemaRef, Expr *E) { 2600 QualType ExprType = E->getType(); 2601 QualType TargetType = SemaRef.Context.getRValueReferenceType(ExprType); 2602 SourceLocation ExprLoc = E->getLocStart(); 2603 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2604 TargetType, ExprLoc); 2605 2606 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2607 SourceRange(ExprLoc, ExprLoc), 2608 E->getSourceRange()).take(); 2609} 2610 2611/// ImplicitInitializerKind - How an implicit base or member initializer should 2612/// initialize its base or member. 2613enum ImplicitInitializerKind { 2614 IIK_Default, 2615 IIK_Copy, 2616 IIK_Move 2617}; 2618 2619static bool 2620BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2621 ImplicitInitializerKind ImplicitInitKind, 2622 CXXBaseSpecifier *BaseSpec, 2623 bool IsInheritedVirtualBase, 2624 CXXCtorInitializer *&CXXBaseInit) { 2625 InitializedEntity InitEntity 2626 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2627 IsInheritedVirtualBase); 2628 2629 ExprResult BaseInit; 2630 2631 switch (ImplicitInitKind) { 2632 case IIK_Default: { 2633 InitializationKind InitKind 2634 = InitializationKind::CreateDefault(Constructor->getLocation()); 2635 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2636 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2637 break; 2638 } 2639 2640 case IIK_Move: 2641 case IIK_Copy: { 2642 bool Moving = ImplicitInitKind == IIK_Move; 2643 ParmVarDecl *Param = Constructor->getParamDecl(0); 2644 QualType ParamType = Param->getType().getNonReferenceType(); 2645 2646 Expr *CopyCtorArg = 2647 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2648 SourceLocation(), Param, false, 2649 Constructor->getLocation(), ParamType, 2650 VK_LValue, 0); 2651 2652 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2653 2654 // Cast to the base class to avoid ambiguities. 2655 QualType ArgTy = 2656 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2657 ParamType.getQualifiers()); 2658 2659 if (Moving) { 2660 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2661 } 2662 2663 CXXCastPath BasePath; 2664 BasePath.push_back(BaseSpec); 2665 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2666 CK_UncheckedDerivedToBase, 2667 Moving ? VK_XValue : VK_LValue, 2668 &BasePath).take(); 2669 2670 InitializationKind InitKind 2671 = InitializationKind::CreateDirect(Constructor->getLocation(), 2672 SourceLocation(), SourceLocation()); 2673 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2674 &CopyCtorArg, 1); 2675 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2676 MultiExprArg(&CopyCtorArg, 1)); 2677 break; 2678 } 2679 } 2680 2681 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2682 if (BaseInit.isInvalid()) 2683 return true; 2684 2685 CXXBaseInit = 2686 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2687 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2688 SourceLocation()), 2689 BaseSpec->isVirtual(), 2690 SourceLocation(), 2691 BaseInit.takeAs<Expr>(), 2692 SourceLocation(), 2693 SourceLocation()); 2694 2695 return false; 2696} 2697 2698static bool RefersToRValueRef(Expr *MemRef) { 2699 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2700 return Referenced->getType()->isRValueReferenceType(); 2701} 2702 2703static bool 2704BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2705 ImplicitInitializerKind ImplicitInitKind, 2706 FieldDecl *Field, IndirectFieldDecl *Indirect, 2707 CXXCtorInitializer *&CXXMemberInit) { 2708 if (Field->isInvalidDecl()) 2709 return true; 2710 2711 SourceLocation Loc = Constructor->getLocation(); 2712 2713 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2714 bool Moving = ImplicitInitKind == IIK_Move; 2715 ParmVarDecl *Param = Constructor->getParamDecl(0); 2716 QualType ParamType = Param->getType().getNonReferenceType(); 2717 2718 // Suppress copying zero-width bitfields. 2719 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2720 return false; 2721 2722 Expr *MemberExprBase = 2723 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2724 SourceLocation(), Param, false, 2725 Loc, ParamType, VK_LValue, 0); 2726 2727 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2728 2729 if (Moving) { 2730 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2731 } 2732 2733 // Build a reference to this field within the parameter. 2734 CXXScopeSpec SS; 2735 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2736 Sema::LookupMemberName); 2737 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2738 : cast<ValueDecl>(Field), AS_public); 2739 MemberLookup.resolveKind(); 2740 ExprResult CtorArg 2741 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2742 ParamType, Loc, 2743 /*IsArrow=*/false, 2744 SS, 2745 /*TemplateKWLoc=*/SourceLocation(), 2746 /*FirstQualifierInScope=*/0, 2747 MemberLookup, 2748 /*TemplateArgs=*/0); 2749 if (CtorArg.isInvalid()) 2750 return true; 2751 2752 // C++11 [class.copy]p15: 2753 // - if a member m has rvalue reference type T&&, it is direct-initialized 2754 // with static_cast<T&&>(x.m); 2755 if (RefersToRValueRef(CtorArg.get())) { 2756 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2757 } 2758 2759 // When the field we are copying is an array, create index variables for 2760 // each dimension of the array. We use these index variables to subscript 2761 // the source array, and other clients (e.g., CodeGen) will perform the 2762 // necessary iteration with these index variables. 2763 SmallVector<VarDecl *, 4> IndexVariables; 2764 QualType BaseType = Field->getType(); 2765 QualType SizeType = SemaRef.Context.getSizeType(); 2766 bool InitializingArray = false; 2767 while (const ConstantArrayType *Array 2768 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2769 InitializingArray = true; 2770 // Create the iteration variable for this array index. 2771 IdentifierInfo *IterationVarName = 0; 2772 { 2773 SmallString<8> Str; 2774 llvm::raw_svector_ostream OS(Str); 2775 OS << "__i" << IndexVariables.size(); 2776 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2777 } 2778 VarDecl *IterationVar 2779 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2780 IterationVarName, SizeType, 2781 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2782 SC_None, SC_None); 2783 IndexVariables.push_back(IterationVar); 2784 2785 // Create a reference to the iteration variable. 2786 ExprResult IterationVarRef 2787 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2788 assert(!IterationVarRef.isInvalid() && 2789 "Reference to invented variable cannot fail!"); 2790 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2791 assert(!IterationVarRef.isInvalid() && 2792 "Conversion of invented variable cannot fail!"); 2793 2794 // Subscript the array with this iteration variable. 2795 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2796 IterationVarRef.take(), 2797 Loc); 2798 if (CtorArg.isInvalid()) 2799 return true; 2800 2801 BaseType = Array->getElementType(); 2802 } 2803 2804 // The array subscript expression is an lvalue, which is wrong for moving. 2805 if (Moving && InitializingArray) 2806 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2807 2808 // Construct the entity that we will be initializing. For an array, this 2809 // will be first element in the array, which may require several levels 2810 // of array-subscript entities. 2811 SmallVector<InitializedEntity, 4> Entities; 2812 Entities.reserve(1 + IndexVariables.size()); 2813 if (Indirect) 2814 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2815 else 2816 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2817 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2818 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2819 0, 2820 Entities.back())); 2821 2822 // Direct-initialize to use the copy constructor. 2823 InitializationKind InitKind = 2824 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2825 2826 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2827 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2828 &CtorArgE, 1); 2829 2830 ExprResult MemberInit 2831 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2832 MultiExprArg(&CtorArgE, 1)); 2833 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2834 if (MemberInit.isInvalid()) 2835 return true; 2836 2837 if (Indirect) { 2838 assert(IndexVariables.size() == 0 && 2839 "Indirect field improperly initialized"); 2840 CXXMemberInit 2841 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2842 Loc, Loc, 2843 MemberInit.takeAs<Expr>(), 2844 Loc); 2845 } else 2846 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2847 Loc, MemberInit.takeAs<Expr>(), 2848 Loc, 2849 IndexVariables.data(), 2850 IndexVariables.size()); 2851 return false; 2852 } 2853 2854 assert(ImplicitInitKind == IIK_Default && "Unhandled implicit init kind!"); 2855 2856 QualType FieldBaseElementType = 2857 SemaRef.Context.getBaseElementType(Field->getType()); 2858 2859 if (FieldBaseElementType->isRecordType()) { 2860 InitializedEntity InitEntity 2861 = Indirect? InitializedEntity::InitializeMember(Indirect) 2862 : InitializedEntity::InitializeMember(Field); 2863 InitializationKind InitKind = 2864 InitializationKind::CreateDefault(Loc); 2865 2866 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2867 ExprResult MemberInit = 2868 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2869 2870 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2871 if (MemberInit.isInvalid()) 2872 return true; 2873 2874 if (Indirect) 2875 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2876 Indirect, Loc, 2877 Loc, 2878 MemberInit.get(), 2879 Loc); 2880 else 2881 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2882 Field, Loc, Loc, 2883 MemberInit.get(), 2884 Loc); 2885 return false; 2886 } 2887 2888 if (!Field->getParent()->isUnion()) { 2889 if (FieldBaseElementType->isReferenceType()) { 2890 SemaRef.Diag(Constructor->getLocation(), 2891 diag::err_uninitialized_member_in_ctor) 2892 << (int)Constructor->isImplicit() 2893 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2894 << 0 << Field->getDeclName(); 2895 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2896 return true; 2897 } 2898 2899 if (FieldBaseElementType.isConstQualified()) { 2900 SemaRef.Diag(Constructor->getLocation(), 2901 diag::err_uninitialized_member_in_ctor) 2902 << (int)Constructor->isImplicit() 2903 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2904 << 1 << Field->getDeclName(); 2905 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2906 return true; 2907 } 2908 } 2909 2910 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2911 FieldBaseElementType->isObjCRetainableType() && 2912 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2913 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2914 // ARC: 2915 // Default-initialize Objective-C pointers to NULL. 2916 CXXMemberInit 2917 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2918 Loc, Loc, 2919 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2920 Loc); 2921 return false; 2922 } 2923 2924 // Nothing to initialize. 2925 CXXMemberInit = 0; 2926 return false; 2927} 2928 2929namespace { 2930struct BaseAndFieldInfo { 2931 Sema &S; 2932 CXXConstructorDecl *Ctor; 2933 bool AnyErrorsInInits; 2934 ImplicitInitializerKind IIK; 2935 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 2936 SmallVector<CXXCtorInitializer*, 8> AllToInit; 2937 2938 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 2939 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 2940 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 2941 if (Generated && Ctor->isCopyConstructor()) 2942 IIK = IIK_Copy; 2943 else if (Generated && Ctor->isMoveConstructor()) 2944 IIK = IIK_Move; 2945 else 2946 IIK = IIK_Default; 2947 } 2948 2949 bool isImplicitCopyOrMove() const { 2950 switch (IIK) { 2951 case IIK_Copy: 2952 case IIK_Move: 2953 return true; 2954 2955 case IIK_Default: 2956 return false; 2957 } 2958 2959 llvm_unreachable("Invalid ImplicitInitializerKind!"); 2960 } 2961 2962 bool addFieldInitializer(CXXCtorInitializer *Init) { 2963 AllToInit.push_back(Init); 2964 2965 // Check whether this initializer makes the field "used". 2966 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 2967 S.UnusedPrivateFields.remove(Init->getAnyMember()); 2968 2969 return false; 2970 } 2971}; 2972} 2973 2974/// \brief Determine whether the given indirect field declaration is somewhere 2975/// within an anonymous union. 2976static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 2977 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 2978 CEnd = F->chain_end(); 2979 C != CEnd; ++C) 2980 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 2981 if (Record->isUnion()) 2982 return true; 2983 2984 return false; 2985} 2986 2987/// \brief Determine whether the given type is an incomplete or zero-lenfgth 2988/// array type. 2989static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 2990 if (T->isIncompleteArrayType()) 2991 return true; 2992 2993 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 2994 if (!ArrayT->getSize()) 2995 return true; 2996 2997 T = ArrayT->getElementType(); 2998 } 2999 3000 return false; 3001} 3002 3003static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3004 FieldDecl *Field, 3005 IndirectFieldDecl *Indirect = 0) { 3006 3007 // Overwhelmingly common case: we have a direct initializer for this field. 3008 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3009 return Info.addFieldInitializer(Init); 3010 3011 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3012 // has a brace-or-equal-initializer, the entity is initialized as specified 3013 // in [dcl.init]. 3014 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3015 CXXCtorInitializer *Init; 3016 if (Indirect) 3017 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3018 SourceLocation(), 3019 SourceLocation(), 0, 3020 SourceLocation()); 3021 else 3022 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3023 SourceLocation(), 3024 SourceLocation(), 0, 3025 SourceLocation()); 3026 return Info.addFieldInitializer(Init); 3027 } 3028 3029 // Don't build an implicit initializer for union members if none was 3030 // explicitly specified. 3031 if (Field->getParent()->isUnion() || 3032 (Indirect && isWithinAnonymousUnion(Indirect))) 3033 return false; 3034 3035 // Don't initialize incomplete or zero-length arrays. 3036 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3037 return false; 3038 3039 // Don't try to build an implicit initializer if there were semantic 3040 // errors in any of the initializers (and therefore we might be 3041 // missing some that the user actually wrote). 3042 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3043 return false; 3044 3045 CXXCtorInitializer *Init = 0; 3046 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3047 Indirect, Init)) 3048 return true; 3049 3050 if (!Init) 3051 return false; 3052 3053 return Info.addFieldInitializer(Init); 3054} 3055 3056bool 3057Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3058 CXXCtorInitializer *Initializer) { 3059 assert(Initializer->isDelegatingInitializer()); 3060 Constructor->setNumCtorInitializers(1); 3061 CXXCtorInitializer **initializer = 3062 new (Context) CXXCtorInitializer*[1]; 3063 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3064 Constructor->setCtorInitializers(initializer); 3065 3066 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3067 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3068 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3069 } 3070 3071 DelegatingCtorDecls.push_back(Constructor); 3072 3073 return false; 3074} 3075 3076bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, 3077 CXXCtorInitializer **Initializers, 3078 unsigned NumInitializers, 3079 bool AnyErrors) { 3080 if (Constructor->isDependentContext()) { 3081 // Just store the initializers as written, they will be checked during 3082 // instantiation. 3083 if (NumInitializers > 0) { 3084 Constructor->setNumCtorInitializers(NumInitializers); 3085 CXXCtorInitializer **baseOrMemberInitializers = 3086 new (Context) CXXCtorInitializer*[NumInitializers]; 3087 memcpy(baseOrMemberInitializers, Initializers, 3088 NumInitializers * sizeof(CXXCtorInitializer*)); 3089 Constructor->setCtorInitializers(baseOrMemberInitializers); 3090 } 3091 3092 // Let template instantiation know whether we had errors. 3093 if (AnyErrors) 3094 Constructor->setInvalidDecl(); 3095 3096 return false; 3097 } 3098 3099 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3100 3101 // We need to build the initializer AST according to order of construction 3102 // and not what user specified in the Initializers list. 3103 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3104 if (!ClassDecl) 3105 return true; 3106 3107 bool HadError = false; 3108 3109 for (unsigned i = 0; i < NumInitializers; i++) { 3110 CXXCtorInitializer *Member = Initializers[i]; 3111 3112 if (Member->isBaseInitializer()) 3113 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3114 else 3115 Info.AllBaseFields[Member->getAnyMember()] = Member; 3116 } 3117 3118 // Keep track of the direct virtual bases. 3119 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3120 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3121 E = ClassDecl->bases_end(); I != E; ++I) { 3122 if (I->isVirtual()) 3123 DirectVBases.insert(I); 3124 } 3125 3126 // Push virtual bases before others. 3127 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3128 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3129 3130 if (CXXCtorInitializer *Value 3131 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3132 Info.AllToInit.push_back(Value); 3133 } else if (!AnyErrors) { 3134 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3135 CXXCtorInitializer *CXXBaseInit; 3136 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3137 VBase, IsInheritedVirtualBase, 3138 CXXBaseInit)) { 3139 HadError = true; 3140 continue; 3141 } 3142 3143 Info.AllToInit.push_back(CXXBaseInit); 3144 } 3145 } 3146 3147 // Non-virtual bases. 3148 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3149 E = ClassDecl->bases_end(); Base != E; ++Base) { 3150 // Virtuals are in the virtual base list and already constructed. 3151 if (Base->isVirtual()) 3152 continue; 3153 3154 if (CXXCtorInitializer *Value 3155 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3156 Info.AllToInit.push_back(Value); 3157 } else if (!AnyErrors) { 3158 CXXCtorInitializer *CXXBaseInit; 3159 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3160 Base, /*IsInheritedVirtualBase=*/false, 3161 CXXBaseInit)) { 3162 HadError = true; 3163 continue; 3164 } 3165 3166 Info.AllToInit.push_back(CXXBaseInit); 3167 } 3168 } 3169 3170 // Fields. 3171 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3172 MemEnd = ClassDecl->decls_end(); 3173 Mem != MemEnd; ++Mem) { 3174 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3175 // C++ [class.bit]p2: 3176 // A declaration for a bit-field that omits the identifier declares an 3177 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3178 // initialized. 3179 if (F->isUnnamedBitfield()) 3180 continue; 3181 3182 // If we're not generating the implicit copy/move constructor, then we'll 3183 // handle anonymous struct/union fields based on their individual 3184 // indirect fields. 3185 if (F->isAnonymousStructOrUnion() && Info.IIK == IIK_Default) 3186 continue; 3187 3188 if (CollectFieldInitializer(*this, Info, F)) 3189 HadError = true; 3190 continue; 3191 } 3192 3193 // Beyond this point, we only consider default initialization. 3194 if (Info.IIK != IIK_Default) 3195 continue; 3196 3197 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3198 if (F->getType()->isIncompleteArrayType()) { 3199 assert(ClassDecl->hasFlexibleArrayMember() && 3200 "Incomplete array type is not valid"); 3201 continue; 3202 } 3203 3204 // Initialize each field of an anonymous struct individually. 3205 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3206 HadError = true; 3207 3208 continue; 3209 } 3210 } 3211 3212 NumInitializers = Info.AllToInit.size(); 3213 if (NumInitializers > 0) { 3214 Constructor->setNumCtorInitializers(NumInitializers); 3215 CXXCtorInitializer **baseOrMemberInitializers = 3216 new (Context) CXXCtorInitializer*[NumInitializers]; 3217 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3218 NumInitializers * sizeof(CXXCtorInitializer*)); 3219 Constructor->setCtorInitializers(baseOrMemberInitializers); 3220 3221 // Constructors implicitly reference the base and member 3222 // destructors. 3223 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3224 Constructor->getParent()); 3225 } 3226 3227 return HadError; 3228} 3229 3230static void *GetKeyForTopLevelField(FieldDecl *Field) { 3231 // For anonymous unions, use the class declaration as the key. 3232 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3233 if (RT->getDecl()->isAnonymousStructOrUnion()) 3234 return static_cast<void *>(RT->getDecl()); 3235 } 3236 return static_cast<void *>(Field); 3237} 3238 3239static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3240 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3241} 3242 3243static void *GetKeyForMember(ASTContext &Context, 3244 CXXCtorInitializer *Member) { 3245 if (!Member->isAnyMemberInitializer()) 3246 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3247 3248 // For fields injected into the class via declaration of an anonymous union, 3249 // use its anonymous union class declaration as the unique key. 3250 FieldDecl *Field = Member->getAnyMember(); 3251 3252 // If the field is a member of an anonymous struct or union, our key 3253 // is the anonymous record decl that's a direct child of the class. 3254 RecordDecl *RD = Field->getParent(); 3255 if (RD->isAnonymousStructOrUnion()) { 3256 while (true) { 3257 RecordDecl *Parent = cast<RecordDecl>(RD->getDeclContext()); 3258 if (Parent->isAnonymousStructOrUnion()) 3259 RD = Parent; 3260 else 3261 break; 3262 } 3263 3264 return static_cast<void *>(RD); 3265 } 3266 3267 return static_cast<void *>(Field); 3268} 3269 3270static void 3271DiagnoseBaseOrMemInitializerOrder(Sema &SemaRef, 3272 const CXXConstructorDecl *Constructor, 3273 CXXCtorInitializer **Inits, 3274 unsigned NumInits) { 3275 if (Constructor->getDeclContext()->isDependentContext()) 3276 return; 3277 3278 // Don't check initializers order unless the warning is enabled at the 3279 // location of at least one initializer. 3280 bool ShouldCheckOrder = false; 3281 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3282 CXXCtorInitializer *Init = Inits[InitIndex]; 3283 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3284 Init->getSourceLocation()) 3285 != DiagnosticsEngine::Ignored) { 3286 ShouldCheckOrder = true; 3287 break; 3288 } 3289 } 3290 if (!ShouldCheckOrder) 3291 return; 3292 3293 // Build the list of bases and members in the order that they'll 3294 // actually be initialized. The explicit initializers should be in 3295 // this same order but may be missing things. 3296 SmallVector<const void*, 32> IdealInitKeys; 3297 3298 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3299 3300 // 1. Virtual bases. 3301 for (CXXRecordDecl::base_class_const_iterator VBase = 3302 ClassDecl->vbases_begin(), 3303 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3304 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3305 3306 // 2. Non-virtual bases. 3307 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3308 E = ClassDecl->bases_end(); Base != E; ++Base) { 3309 if (Base->isVirtual()) 3310 continue; 3311 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3312 } 3313 3314 // 3. Direct fields. 3315 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3316 E = ClassDecl->field_end(); Field != E; ++Field) { 3317 if (Field->isUnnamedBitfield()) 3318 continue; 3319 3320 IdealInitKeys.push_back(GetKeyForTopLevelField(*Field)); 3321 } 3322 3323 unsigned NumIdealInits = IdealInitKeys.size(); 3324 unsigned IdealIndex = 0; 3325 3326 CXXCtorInitializer *PrevInit = 0; 3327 for (unsigned InitIndex = 0; InitIndex != NumInits; ++InitIndex) { 3328 CXXCtorInitializer *Init = Inits[InitIndex]; 3329 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3330 3331 // Scan forward to try to find this initializer in the idealized 3332 // initializers list. 3333 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3334 if (InitKey == IdealInitKeys[IdealIndex]) 3335 break; 3336 3337 // If we didn't find this initializer, it must be because we 3338 // scanned past it on a previous iteration. That can only 3339 // happen if we're out of order; emit a warning. 3340 if (IdealIndex == NumIdealInits && PrevInit) { 3341 Sema::SemaDiagnosticBuilder D = 3342 SemaRef.Diag(PrevInit->getSourceLocation(), 3343 diag::warn_initializer_out_of_order); 3344 3345 if (PrevInit->isAnyMemberInitializer()) 3346 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3347 else 3348 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3349 3350 if (Init->isAnyMemberInitializer()) 3351 D << 0 << Init->getAnyMember()->getDeclName(); 3352 else 3353 D << 1 << Init->getTypeSourceInfo()->getType(); 3354 3355 // Move back to the initializer's location in the ideal list. 3356 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3357 if (InitKey == IdealInitKeys[IdealIndex]) 3358 break; 3359 3360 assert(IdealIndex != NumIdealInits && 3361 "initializer not found in initializer list"); 3362 } 3363 3364 PrevInit = Init; 3365 } 3366} 3367 3368namespace { 3369bool CheckRedundantInit(Sema &S, 3370 CXXCtorInitializer *Init, 3371 CXXCtorInitializer *&PrevInit) { 3372 if (!PrevInit) { 3373 PrevInit = Init; 3374 return false; 3375 } 3376 3377 if (FieldDecl *Field = Init->getMember()) 3378 S.Diag(Init->getSourceLocation(), 3379 diag::err_multiple_mem_initialization) 3380 << Field->getDeclName() 3381 << Init->getSourceRange(); 3382 else { 3383 const Type *BaseClass = Init->getBaseClass(); 3384 assert(BaseClass && "neither field nor base"); 3385 S.Diag(Init->getSourceLocation(), 3386 diag::err_multiple_base_initialization) 3387 << QualType(BaseClass, 0) 3388 << Init->getSourceRange(); 3389 } 3390 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3391 << 0 << PrevInit->getSourceRange(); 3392 3393 return true; 3394} 3395 3396typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3397typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3398 3399bool CheckRedundantUnionInit(Sema &S, 3400 CXXCtorInitializer *Init, 3401 RedundantUnionMap &Unions) { 3402 FieldDecl *Field = Init->getAnyMember(); 3403 RecordDecl *Parent = Field->getParent(); 3404 NamedDecl *Child = Field; 3405 3406 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3407 if (Parent->isUnion()) { 3408 UnionEntry &En = Unions[Parent]; 3409 if (En.first && En.first != Child) { 3410 S.Diag(Init->getSourceLocation(), 3411 diag::err_multiple_mem_union_initialization) 3412 << Field->getDeclName() 3413 << Init->getSourceRange(); 3414 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3415 << 0 << En.second->getSourceRange(); 3416 return true; 3417 } 3418 if (!En.first) { 3419 En.first = Child; 3420 En.second = Init; 3421 } 3422 if (!Parent->isAnonymousStructOrUnion()) 3423 return false; 3424 } 3425 3426 Child = Parent; 3427 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3428 } 3429 3430 return false; 3431} 3432} 3433 3434/// ActOnMemInitializers - Handle the member initializers for a constructor. 3435void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3436 SourceLocation ColonLoc, 3437 CXXCtorInitializer **meminits, 3438 unsigned NumMemInits, 3439 bool AnyErrors) { 3440 if (!ConstructorDecl) 3441 return; 3442 3443 AdjustDeclIfTemplate(ConstructorDecl); 3444 3445 CXXConstructorDecl *Constructor 3446 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3447 3448 if (!Constructor) { 3449 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3450 return; 3451 } 3452 3453 CXXCtorInitializer **MemInits = 3454 reinterpret_cast<CXXCtorInitializer **>(meminits); 3455 3456 // Mapping for the duplicate initializers check. 3457 // For member initializers, this is keyed with a FieldDecl*. 3458 // For base initializers, this is keyed with a Type*. 3459 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3460 3461 // Mapping for the inconsistent anonymous-union initializers check. 3462 RedundantUnionMap MemberUnions; 3463 3464 bool HadError = false; 3465 for (unsigned i = 0; i < NumMemInits; i++) { 3466 CXXCtorInitializer *Init = MemInits[i]; 3467 3468 // Set the source order index. 3469 Init->setSourceOrder(i); 3470 3471 if (Init->isAnyMemberInitializer()) { 3472 FieldDecl *Field = Init->getAnyMember(); 3473 if (CheckRedundantInit(*this, Init, Members[Field]) || 3474 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3475 HadError = true; 3476 } else if (Init->isBaseInitializer()) { 3477 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3478 if (CheckRedundantInit(*this, Init, Members[Key])) 3479 HadError = true; 3480 } else { 3481 assert(Init->isDelegatingInitializer()); 3482 // This must be the only initializer 3483 if (NumMemInits != 1) { 3484 Diag(Init->getSourceLocation(), 3485 diag::err_delegating_initializer_alone) 3486 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3487 // We will treat this as being the only initializer. 3488 } 3489 SetDelegatingInitializer(Constructor, MemInits[i]); 3490 // Return immediately as the initializer is set. 3491 return; 3492 } 3493 } 3494 3495 if (HadError) 3496 return; 3497 3498 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits, NumMemInits); 3499 3500 SetCtorInitializers(Constructor, MemInits, NumMemInits, AnyErrors); 3501} 3502 3503void 3504Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3505 CXXRecordDecl *ClassDecl) { 3506 // Ignore dependent contexts. Also ignore unions, since their members never 3507 // have destructors implicitly called. 3508 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3509 return; 3510 3511 // FIXME: all the access-control diagnostics are positioned on the 3512 // field/base declaration. That's probably good; that said, the 3513 // user might reasonably want to know why the destructor is being 3514 // emitted, and we currently don't say. 3515 3516 // Non-static data members. 3517 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3518 E = ClassDecl->field_end(); I != E; ++I) { 3519 FieldDecl *Field = *I; 3520 if (Field->isInvalidDecl()) 3521 continue; 3522 3523 // Don't destroy incomplete or zero-length arrays. 3524 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3525 continue; 3526 3527 QualType FieldType = Context.getBaseElementType(Field->getType()); 3528 3529 const RecordType* RT = FieldType->getAs<RecordType>(); 3530 if (!RT) 3531 continue; 3532 3533 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3534 if (FieldClassDecl->isInvalidDecl()) 3535 continue; 3536 if (FieldClassDecl->hasIrrelevantDestructor()) 3537 continue; 3538 // The destructor for an implicit anonymous union member is never invoked. 3539 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3540 continue; 3541 3542 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3543 assert(Dtor && "No dtor found for FieldClassDecl!"); 3544 CheckDestructorAccess(Field->getLocation(), Dtor, 3545 PDiag(diag::err_access_dtor_field) 3546 << Field->getDeclName() 3547 << FieldType); 3548 3549 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3550 DiagnoseUseOfDecl(Dtor, Location); 3551 } 3552 3553 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3554 3555 // Bases. 3556 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3557 E = ClassDecl->bases_end(); Base != E; ++Base) { 3558 // Bases are always records in a well-formed non-dependent class. 3559 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3560 3561 // Remember direct virtual bases. 3562 if (Base->isVirtual()) 3563 DirectVirtualBases.insert(RT); 3564 3565 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3566 // If our base class is invalid, we probably can't get its dtor anyway. 3567 if (BaseClassDecl->isInvalidDecl()) 3568 continue; 3569 if (BaseClassDecl->hasIrrelevantDestructor()) 3570 continue; 3571 3572 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3573 assert(Dtor && "No dtor found for BaseClassDecl!"); 3574 3575 // FIXME: caret should be on the start of the class name 3576 CheckDestructorAccess(Base->getLocStart(), Dtor, 3577 PDiag(diag::err_access_dtor_base) 3578 << Base->getType() 3579 << Base->getSourceRange(), 3580 Context.getTypeDeclType(ClassDecl)); 3581 3582 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3583 DiagnoseUseOfDecl(Dtor, Location); 3584 } 3585 3586 // Virtual bases. 3587 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3588 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3589 3590 // Bases are always records in a well-formed non-dependent class. 3591 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3592 3593 // Ignore direct virtual bases. 3594 if (DirectVirtualBases.count(RT)) 3595 continue; 3596 3597 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3598 // If our base class is invalid, we probably can't get its dtor anyway. 3599 if (BaseClassDecl->isInvalidDecl()) 3600 continue; 3601 if (BaseClassDecl->hasIrrelevantDestructor()) 3602 continue; 3603 3604 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3605 assert(Dtor && "No dtor found for BaseClassDecl!"); 3606 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3607 PDiag(diag::err_access_dtor_vbase) 3608 << VBase->getType(), 3609 Context.getTypeDeclType(ClassDecl)); 3610 3611 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3612 DiagnoseUseOfDecl(Dtor, Location); 3613 } 3614} 3615 3616void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3617 if (!CDtorDecl) 3618 return; 3619 3620 if (CXXConstructorDecl *Constructor 3621 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3622 SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false); 3623} 3624 3625bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3626 unsigned DiagID, AbstractDiagSelID SelID) { 3627 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3628 unsigned DiagID; 3629 AbstractDiagSelID SelID; 3630 3631 public: 3632 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3633 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3634 3635 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3636 if (Suppressed) return; 3637 if (SelID == -1) 3638 S.Diag(Loc, DiagID) << T; 3639 else 3640 S.Diag(Loc, DiagID) << SelID << T; 3641 } 3642 } Diagnoser(DiagID, SelID); 3643 3644 return RequireNonAbstractType(Loc, T, Diagnoser); 3645} 3646 3647bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3648 TypeDiagnoser &Diagnoser) { 3649 if (!getLangOpts().CPlusPlus) 3650 return false; 3651 3652 if (const ArrayType *AT = Context.getAsArrayType(T)) 3653 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3654 3655 if (const PointerType *PT = T->getAs<PointerType>()) { 3656 // Find the innermost pointer type. 3657 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3658 PT = T; 3659 3660 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3661 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3662 } 3663 3664 const RecordType *RT = T->getAs<RecordType>(); 3665 if (!RT) 3666 return false; 3667 3668 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3669 3670 // We can't answer whether something is abstract until it has a 3671 // definition. If it's currently being defined, we'll walk back 3672 // over all the declarations when we have a full definition. 3673 const CXXRecordDecl *Def = RD->getDefinition(); 3674 if (!Def || Def->isBeingDefined()) 3675 return false; 3676 3677 if (!RD->isAbstract()) 3678 return false; 3679 3680 Diagnoser.diagnose(*this, Loc, T); 3681 DiagnoseAbstractType(RD); 3682 3683 return true; 3684} 3685 3686void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3687 // Check if we've already emitted the list of pure virtual functions 3688 // for this class. 3689 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3690 return; 3691 3692 CXXFinalOverriderMap FinalOverriders; 3693 RD->getFinalOverriders(FinalOverriders); 3694 3695 // Keep a set of seen pure methods so we won't diagnose the same method 3696 // more than once. 3697 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3698 3699 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3700 MEnd = FinalOverriders.end(); 3701 M != MEnd; 3702 ++M) { 3703 for (OverridingMethods::iterator SO = M->second.begin(), 3704 SOEnd = M->second.end(); 3705 SO != SOEnd; ++SO) { 3706 // C++ [class.abstract]p4: 3707 // A class is abstract if it contains or inherits at least one 3708 // pure virtual function for which the final overrider is pure 3709 // virtual. 3710 3711 // 3712 if (SO->second.size() != 1) 3713 continue; 3714 3715 if (!SO->second.front().Method->isPure()) 3716 continue; 3717 3718 if (!SeenPureMethods.insert(SO->second.front().Method)) 3719 continue; 3720 3721 Diag(SO->second.front().Method->getLocation(), 3722 diag::note_pure_virtual_function) 3723 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3724 } 3725 } 3726 3727 if (!PureVirtualClassDiagSet) 3728 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3729 PureVirtualClassDiagSet->insert(RD); 3730} 3731 3732namespace { 3733struct AbstractUsageInfo { 3734 Sema &S; 3735 CXXRecordDecl *Record; 3736 CanQualType AbstractType; 3737 bool Invalid; 3738 3739 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3740 : S(S), Record(Record), 3741 AbstractType(S.Context.getCanonicalType( 3742 S.Context.getTypeDeclType(Record))), 3743 Invalid(false) {} 3744 3745 void DiagnoseAbstractType() { 3746 if (Invalid) return; 3747 S.DiagnoseAbstractType(Record); 3748 Invalid = true; 3749 } 3750 3751 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3752}; 3753 3754struct CheckAbstractUsage { 3755 AbstractUsageInfo &Info; 3756 const NamedDecl *Ctx; 3757 3758 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3759 : Info(Info), Ctx(Ctx) {} 3760 3761 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3762 switch (TL.getTypeLocClass()) { 3763#define ABSTRACT_TYPELOC(CLASS, PARENT) 3764#define TYPELOC(CLASS, PARENT) \ 3765 case TypeLoc::CLASS: Check(cast<CLASS##TypeLoc>(TL), Sel); break; 3766#include "clang/AST/TypeLocNodes.def" 3767 } 3768 } 3769 3770 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3771 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3772 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3773 if (!TL.getArg(I)) 3774 continue; 3775 3776 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3777 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3778 } 3779 } 3780 3781 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3782 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3783 } 3784 3785 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3786 // Visit the type parameters from a permissive context. 3787 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3788 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3789 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3790 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3791 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3792 // TODO: other template argument types? 3793 } 3794 } 3795 3796 // Visit pointee types from a permissive context. 3797#define CheckPolymorphic(Type) \ 3798 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3799 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3800 } 3801 CheckPolymorphic(PointerTypeLoc) 3802 CheckPolymorphic(ReferenceTypeLoc) 3803 CheckPolymorphic(MemberPointerTypeLoc) 3804 CheckPolymorphic(BlockPointerTypeLoc) 3805 CheckPolymorphic(AtomicTypeLoc) 3806 3807 /// Handle all the types we haven't given a more specific 3808 /// implementation for above. 3809 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3810 // Every other kind of type that we haven't called out already 3811 // that has an inner type is either (1) sugar or (2) contains that 3812 // inner type in some way as a subobject. 3813 if (TypeLoc Next = TL.getNextTypeLoc()) 3814 return Visit(Next, Sel); 3815 3816 // If there's no inner type and we're in a permissive context, 3817 // don't diagnose. 3818 if (Sel == Sema::AbstractNone) return; 3819 3820 // Check whether the type matches the abstract type. 3821 QualType T = TL.getType(); 3822 if (T->isArrayType()) { 3823 Sel = Sema::AbstractArrayType; 3824 T = Info.S.Context.getBaseElementType(T); 3825 } 3826 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3827 if (CT != Info.AbstractType) return; 3828 3829 // It matched; do some magic. 3830 if (Sel == Sema::AbstractArrayType) { 3831 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3832 << T << TL.getSourceRange(); 3833 } else { 3834 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3835 << Sel << T << TL.getSourceRange(); 3836 } 3837 Info.DiagnoseAbstractType(); 3838 } 3839}; 3840 3841void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3842 Sema::AbstractDiagSelID Sel) { 3843 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3844} 3845 3846} 3847 3848/// Check for invalid uses of an abstract type in a method declaration. 3849static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3850 CXXMethodDecl *MD) { 3851 // No need to do the check on definitions, which require that 3852 // the return/param types be complete. 3853 if (MD->doesThisDeclarationHaveABody()) 3854 return; 3855 3856 // For safety's sake, just ignore it if we don't have type source 3857 // information. This should never happen for non-implicit methods, 3858 // but... 3859 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3860 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3861} 3862 3863/// Check for invalid uses of an abstract type within a class definition. 3864static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3865 CXXRecordDecl *RD) { 3866 for (CXXRecordDecl::decl_iterator 3867 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3868 Decl *D = *I; 3869 if (D->isImplicit()) continue; 3870 3871 // Methods and method templates. 3872 if (isa<CXXMethodDecl>(D)) { 3873 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3874 } else if (isa<FunctionTemplateDecl>(D)) { 3875 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3876 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3877 3878 // Fields and static variables. 3879 } else if (isa<FieldDecl>(D)) { 3880 FieldDecl *FD = cast<FieldDecl>(D); 3881 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3882 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3883 } else if (isa<VarDecl>(D)) { 3884 VarDecl *VD = cast<VarDecl>(D); 3885 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3886 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3887 3888 // Nested classes and class templates. 3889 } else if (isa<CXXRecordDecl>(D)) { 3890 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3891 } else if (isa<ClassTemplateDecl>(D)) { 3892 CheckAbstractClassUsage(Info, 3893 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3894 } 3895 } 3896} 3897 3898/// \brief Perform semantic checks on a class definition that has been 3899/// completing, introducing implicitly-declared members, checking for 3900/// abstract types, etc. 3901void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3902 if (!Record) 3903 return; 3904 3905 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3906 AbstractUsageInfo Info(*this, Record); 3907 CheckAbstractClassUsage(Info, Record); 3908 } 3909 3910 // If this is not an aggregate type and has no user-declared constructor, 3911 // complain about any non-static data members of reference or const scalar 3912 // type, since they will never get initializers. 3913 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3914 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3915 !Record->isLambda()) { 3916 bool Complained = false; 3917 for (RecordDecl::field_iterator F = Record->field_begin(), 3918 FEnd = Record->field_end(); 3919 F != FEnd; ++F) { 3920 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3921 continue; 3922 3923 if (F->getType()->isReferenceType() || 3924 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3925 if (!Complained) { 3926 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3927 << Record->getTagKind() << Record; 3928 Complained = true; 3929 } 3930 3931 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3932 << F->getType()->isReferenceType() 3933 << F->getDeclName(); 3934 } 3935 } 3936 } 3937 3938 if (Record->isDynamicClass() && !Record->isDependentType()) 3939 DynamicClasses.push_back(Record); 3940 3941 if (Record->getIdentifier()) { 3942 // C++ [class.mem]p13: 3943 // If T is the name of a class, then each of the following shall have a 3944 // name different from T: 3945 // - every member of every anonymous union that is a member of class T. 3946 // 3947 // C++ [class.mem]p14: 3948 // In addition, if class T has a user-declared constructor (12.1), every 3949 // non-static data member of class T shall have a name different from T. 3950 for (DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 3951 R.first != R.second; ++R.first) { 3952 NamedDecl *D = *R.first; 3953 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 3954 isa<IndirectFieldDecl>(D)) { 3955 Diag(D->getLocation(), diag::err_member_name_of_class) 3956 << D->getDeclName(); 3957 break; 3958 } 3959 } 3960 } 3961 3962 // Warn if the class has virtual methods but non-virtual public destructor. 3963 if (Record->isPolymorphic() && !Record->isDependentType()) { 3964 CXXDestructorDecl *dtor = Record->getDestructor(); 3965 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 3966 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 3967 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 3968 } 3969 3970 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 3971 Diag(Record->getLocation(), diag::warn_abstract_final_class); 3972 DiagnoseAbstractType(Record); 3973 } 3974 3975 // See if a method overloads virtual methods in a base 3976 /// class without overriding any. 3977 if (!Record->isDependentType()) { 3978 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3979 MEnd = Record->method_end(); 3980 M != MEnd; ++M) { 3981 if (!M->isStatic()) 3982 DiagnoseHiddenVirtualMethods(Record, *M); 3983 } 3984 } 3985 3986 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 3987 // function that is not a constructor declares that member function to be 3988 // const. [...] The class of which that function is a member shall be 3989 // a literal type. 3990 // 3991 // If the class has virtual bases, any constexpr members will already have 3992 // been diagnosed by the checks performed on the member declaration, so 3993 // suppress this (less useful) diagnostic. 3994 if (LangOpts.CPlusPlus0x && !Record->isDependentType() && 3995 !Record->isLiteral() && !Record->getNumVBases()) { 3996 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 3997 MEnd = Record->method_end(); 3998 M != MEnd; ++M) { 3999 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4000 switch (Record->getTemplateSpecializationKind()) { 4001 case TSK_ImplicitInstantiation: 4002 case TSK_ExplicitInstantiationDeclaration: 4003 case TSK_ExplicitInstantiationDefinition: 4004 // If a template instantiates to a non-literal type, but its members 4005 // instantiate to constexpr functions, the template is technically 4006 // ill-formed, but we allow it for sanity. 4007 continue; 4008 4009 case TSK_Undeclared: 4010 case TSK_ExplicitSpecialization: 4011 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4012 diag::err_constexpr_method_non_literal); 4013 break; 4014 } 4015 4016 // Only produce one error per class. 4017 break; 4018 } 4019 } 4020 } 4021 4022 // Declare inherited constructors. We do this eagerly here because: 4023 // - The standard requires an eager diagnostic for conflicting inherited 4024 // constructors from different classes. 4025 // - The lazy declaration of the other implicit constructors is so as to not 4026 // waste space and performance on classes that are not meant to be 4027 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4028 // have inherited constructors. 4029 DeclareInheritedConstructors(Record); 4030} 4031 4032void Sema::CheckExplicitlyDefaultedMethods(CXXRecordDecl *Record) { 4033 for (CXXRecordDecl::method_iterator MI = Record->method_begin(), 4034 ME = Record->method_end(); 4035 MI != ME; ++MI) 4036 if (!MI->isInvalidDecl() && MI->isExplicitlyDefaulted()) 4037 CheckExplicitlyDefaultedSpecialMember(*MI); 4038} 4039 4040/// Is the special member function which would be selected to perform the 4041/// specified operation on the specified class type a constexpr constructor? 4042static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4043 Sema::CXXSpecialMember CSM, 4044 bool ConstArg) { 4045 Sema::SpecialMemberOverloadResult *SMOR = 4046 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4047 false, false, false, false); 4048 if (!SMOR || !SMOR->getMethod()) 4049 // A constructor we wouldn't select can't be "involved in initializing" 4050 // anything. 4051 return true; 4052 return SMOR->getMethod()->isConstexpr(); 4053} 4054 4055/// Determine whether the specified special member function would be constexpr 4056/// if it were implicitly defined. 4057static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4058 Sema::CXXSpecialMember CSM, 4059 bool ConstArg) { 4060 if (!S.getLangOpts().CPlusPlus0x) 4061 return false; 4062 4063 // C++11 [dcl.constexpr]p4: 4064 // In the definition of a constexpr constructor [...] 4065 switch (CSM) { 4066 case Sema::CXXDefaultConstructor: 4067 // Since default constructor lookup is essentially trivial (and cannot 4068 // involve, for instance, template instantiation), we compute whether a 4069 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4070 // 4071 // This is important for performance; we need to know whether the default 4072 // constructor is constexpr to determine whether the type is a literal type. 4073 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4074 4075 case Sema::CXXCopyConstructor: 4076 case Sema::CXXMoveConstructor: 4077 // For copy or move constructors, we need to perform overload resolution. 4078 break; 4079 4080 case Sema::CXXCopyAssignment: 4081 case Sema::CXXMoveAssignment: 4082 case Sema::CXXDestructor: 4083 case Sema::CXXInvalid: 4084 return false; 4085 } 4086 4087 // -- if the class is a non-empty union, or for each non-empty anonymous 4088 // union member of a non-union class, exactly one non-static data member 4089 // shall be initialized; [DR1359] 4090 // 4091 // If we squint, this is guaranteed, since exactly one non-static data member 4092 // will be initialized (if the constructor isn't deleted), we just don't know 4093 // which one. 4094 if (ClassDecl->isUnion()) 4095 return true; 4096 4097 // -- the class shall not have any virtual base classes; 4098 if (ClassDecl->getNumVBases()) 4099 return false; 4100 4101 // -- every constructor involved in initializing [...] base class 4102 // sub-objects shall be a constexpr constructor; 4103 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4104 BEnd = ClassDecl->bases_end(); 4105 B != BEnd; ++B) { 4106 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4107 if (!BaseType) continue; 4108 4109 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4110 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4111 return false; 4112 } 4113 4114 // -- every constructor involved in initializing non-static data members 4115 // [...] shall be a constexpr constructor; 4116 // -- every non-static data member and base class sub-object shall be 4117 // initialized 4118 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4119 FEnd = ClassDecl->field_end(); 4120 F != FEnd; ++F) { 4121 if (F->isInvalidDecl()) 4122 continue; 4123 if (const RecordType *RecordTy = 4124 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4125 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4126 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4127 return false; 4128 } 4129 } 4130 4131 // All OK, it's constexpr! 4132 return true; 4133} 4134 4135static Sema::ImplicitExceptionSpecification 4136computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4137 switch (S.getSpecialMember(MD)) { 4138 case Sema::CXXDefaultConstructor: 4139 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4140 case Sema::CXXCopyConstructor: 4141 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4142 case Sema::CXXCopyAssignment: 4143 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4144 case Sema::CXXMoveConstructor: 4145 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4146 case Sema::CXXMoveAssignment: 4147 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4148 case Sema::CXXDestructor: 4149 return S.ComputeDefaultedDtorExceptionSpec(MD); 4150 case Sema::CXXInvalid: 4151 break; 4152 } 4153 llvm_unreachable("only special members have implicit exception specs"); 4154} 4155 4156static void 4157updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4158 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4159 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4160 ExceptSpec.getEPI(EPI); 4161 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4162 S.Context.getFunctionType(FPT->getResultType(), FPT->arg_type_begin(), 4163 FPT->getNumArgs(), EPI)); 4164 FD->setType(QualType(NewFPT, 0)); 4165} 4166 4167void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4168 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4169 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4170 return; 4171 4172 // Evaluate the exception specification. 4173 ImplicitExceptionSpecification ExceptSpec = 4174 computeImplicitExceptionSpec(*this, Loc, MD); 4175 4176 // Update the type of the special member to use it. 4177 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4178 4179 // A user-provided destructor can be defined outside the class. When that 4180 // happens, be sure to update the exception specification on both 4181 // declarations. 4182 const FunctionProtoType *CanonicalFPT = 4183 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4184 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4185 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4186 CanonicalFPT, ExceptSpec); 4187} 4188 4189static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4190static bool isImplicitCopyAssignmentArgConst(Sema &S, CXXRecordDecl *ClassDecl); 4191 4192void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4193 CXXRecordDecl *RD = MD->getParent(); 4194 CXXSpecialMember CSM = getSpecialMember(MD); 4195 4196 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4197 "not an explicitly-defaulted special member"); 4198 4199 // Whether this was the first-declared instance of the constructor. 4200 // This affects whether we implicitly add an exception spec and constexpr. 4201 bool First = MD == MD->getCanonicalDecl(); 4202 4203 bool HadError = false; 4204 4205 // C++11 [dcl.fct.def.default]p1: 4206 // A function that is explicitly defaulted shall 4207 // -- be a special member function (checked elsewhere), 4208 // -- have the same type (except for ref-qualifiers, and except that a 4209 // copy operation can take a non-const reference) as an implicit 4210 // declaration, and 4211 // -- not have default arguments. 4212 unsigned ExpectedParams = 1; 4213 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4214 ExpectedParams = 0; 4215 if (MD->getNumParams() != ExpectedParams) { 4216 // This also checks for default arguments: a copy or move constructor with a 4217 // default argument is classified as a default constructor, and assignment 4218 // operations and destructors can't have default arguments. 4219 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4220 << CSM << MD->getSourceRange(); 4221 HadError = true; 4222 } 4223 4224 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4225 4226 // Compute argument constness, constexpr, and triviality. 4227 bool CanHaveConstParam = false; 4228 bool Trivial = false; 4229 switch (CSM) { 4230 case CXXDefaultConstructor: 4231 Trivial = RD->hasTrivialDefaultConstructor(); 4232 break; 4233 case CXXCopyConstructor: 4234 CanHaveConstParam = isImplicitCopyCtorArgConst(*this, RD); 4235 Trivial = RD->hasTrivialCopyConstructor(); 4236 break; 4237 case CXXCopyAssignment: 4238 CanHaveConstParam = isImplicitCopyAssignmentArgConst(*this, RD); 4239 Trivial = RD->hasTrivialCopyAssignment(); 4240 break; 4241 case CXXMoveConstructor: 4242 Trivial = RD->hasTrivialMoveConstructor(); 4243 break; 4244 case CXXMoveAssignment: 4245 Trivial = RD->hasTrivialMoveAssignment(); 4246 break; 4247 case CXXDestructor: 4248 Trivial = RD->hasTrivialDestructor(); 4249 break; 4250 case CXXInvalid: 4251 llvm_unreachable("non-special member explicitly defaulted!"); 4252 } 4253 4254 QualType ReturnType = Context.VoidTy; 4255 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4256 // Check for return type matching. 4257 ReturnType = Type->getResultType(); 4258 QualType ExpectedReturnType = 4259 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4260 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4261 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4262 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4263 HadError = true; 4264 } 4265 4266 // A defaulted special member cannot have cv-qualifiers. 4267 if (Type->getTypeQuals()) { 4268 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4269 << (CSM == CXXMoveAssignment); 4270 HadError = true; 4271 } 4272 } 4273 4274 // Check for parameter type matching. 4275 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4276 bool HasConstParam = false; 4277 if (ExpectedParams && ArgType->isReferenceType()) { 4278 // Argument must be reference to possibly-const T. 4279 QualType ReferentType = ArgType->getPointeeType(); 4280 HasConstParam = ReferentType.isConstQualified(); 4281 4282 if (ReferentType.isVolatileQualified()) { 4283 Diag(MD->getLocation(), 4284 diag::err_defaulted_special_member_volatile_param) << CSM; 4285 HadError = true; 4286 } 4287 4288 if (HasConstParam && !CanHaveConstParam) { 4289 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4290 Diag(MD->getLocation(), 4291 diag::err_defaulted_special_member_copy_const_param) 4292 << (CSM == CXXCopyAssignment); 4293 // FIXME: Explain why this special member can't be const. 4294 } else { 4295 Diag(MD->getLocation(), 4296 diag::err_defaulted_special_member_move_const_param) 4297 << (CSM == CXXMoveAssignment); 4298 } 4299 HadError = true; 4300 } 4301 4302 // If a function is explicitly defaulted on its first declaration, it shall 4303 // have the same parameter type as if it had been implicitly declared. 4304 // (Presumably this is to prevent it from being trivial?) 4305 if (!HasConstParam && CanHaveConstParam && First) 4306 Diag(MD->getLocation(), 4307 diag::err_defaulted_special_member_copy_non_const_param) 4308 << (CSM == CXXCopyAssignment); 4309 } else if (ExpectedParams) { 4310 // A copy assignment operator can take its argument by value, but a 4311 // defaulted one cannot. 4312 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4313 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4314 HadError = true; 4315 } 4316 4317 // Rebuild the type with the implicit exception specification added, if we 4318 // are going to need it. 4319 const FunctionProtoType *ImplicitType = 0; 4320 if (First || Type->hasExceptionSpec()) { 4321 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4322 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4323 ImplicitType = cast<FunctionProtoType>( 4324 Context.getFunctionType(ReturnType, &ArgType, ExpectedParams, EPI)); 4325 } 4326 4327 // C++11 [dcl.fct.def.default]p2: 4328 // An explicitly-defaulted function may be declared constexpr only if it 4329 // would have been implicitly declared as constexpr, 4330 // Do not apply this rule to members of class templates, since core issue 1358 4331 // makes such functions always instantiate to constexpr functions. For 4332 // non-constructors, this is checked elsewhere. 4333 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4334 HasConstParam); 4335 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4336 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4337 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4338 // FIXME: Explain why the constructor can't be constexpr. 4339 HadError = true; 4340 } 4341 // and may have an explicit exception-specification only if it is compatible 4342 // with the exception-specification on the implicit declaration. 4343 if (Type->hasExceptionSpec() && 4344 CheckEquivalentExceptionSpec( 4345 PDiag(diag::err_incorrect_defaulted_exception_spec) << CSM, 4346 PDiag(), ImplicitType, SourceLocation(), Type, MD->getLocation())) 4347 HadError = true; 4348 4349 // If a function is explicitly defaulted on its first declaration, 4350 if (First) { 4351 // -- it is implicitly considered to be constexpr if the implicit 4352 // definition would be, 4353 MD->setConstexpr(Constexpr); 4354 4355 // -- it is implicitly considered to have the same exception-specification 4356 // as if it had been implicitly declared, 4357 MD->setType(QualType(ImplicitType, 0)); 4358 4359 // Such a function is also trivial if the implicitly-declared function 4360 // would have been. 4361 MD->setTrivial(Trivial); 4362 } 4363 4364 if (ShouldDeleteSpecialMember(MD, CSM)) { 4365 if (First) { 4366 MD->setDeletedAsWritten(); 4367 } else { 4368 // C++11 [dcl.fct.def.default]p4: 4369 // [For a] user-provided explicitly-defaulted function [...] if such a 4370 // function is implicitly defined as deleted, the program is ill-formed. 4371 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4372 HadError = true; 4373 } 4374 } 4375 4376 if (HadError) 4377 MD->setInvalidDecl(); 4378} 4379 4380namespace { 4381struct SpecialMemberDeletionInfo { 4382 Sema &S; 4383 CXXMethodDecl *MD; 4384 Sema::CXXSpecialMember CSM; 4385 bool Diagnose; 4386 4387 // Properties of the special member, computed for convenience. 4388 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4389 SourceLocation Loc; 4390 4391 bool AllFieldsAreConst; 4392 4393 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4394 Sema::CXXSpecialMember CSM, bool Diagnose) 4395 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4396 IsConstructor(false), IsAssignment(false), IsMove(false), 4397 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4398 AllFieldsAreConst(true) { 4399 switch (CSM) { 4400 case Sema::CXXDefaultConstructor: 4401 case Sema::CXXCopyConstructor: 4402 IsConstructor = true; 4403 break; 4404 case Sema::CXXMoveConstructor: 4405 IsConstructor = true; 4406 IsMove = true; 4407 break; 4408 case Sema::CXXCopyAssignment: 4409 IsAssignment = true; 4410 break; 4411 case Sema::CXXMoveAssignment: 4412 IsAssignment = true; 4413 IsMove = true; 4414 break; 4415 case Sema::CXXDestructor: 4416 break; 4417 case Sema::CXXInvalid: 4418 llvm_unreachable("invalid special member kind"); 4419 } 4420 4421 if (MD->getNumParams()) { 4422 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4423 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4424 } 4425 } 4426 4427 bool inUnion() const { return MD->getParent()->isUnion(); } 4428 4429 /// Look up the corresponding special member in the given class. 4430 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4431 unsigned Quals) { 4432 unsigned TQ = MD->getTypeQualifiers(); 4433 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4434 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4435 Quals = 0; 4436 return S.LookupSpecialMember(Class, CSM, 4437 ConstArg || (Quals & Qualifiers::Const), 4438 VolatileArg || (Quals & Qualifiers::Volatile), 4439 MD->getRefQualifier() == RQ_RValue, 4440 TQ & Qualifiers::Const, 4441 TQ & Qualifiers::Volatile); 4442 } 4443 4444 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4445 4446 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4447 bool shouldDeleteForField(FieldDecl *FD); 4448 bool shouldDeleteForAllConstMembers(); 4449 4450 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4451 unsigned Quals); 4452 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4453 Sema::SpecialMemberOverloadResult *SMOR, 4454 bool IsDtorCallInCtor); 4455 4456 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4457}; 4458} 4459 4460/// Is the given special member inaccessible when used on the given 4461/// sub-object. 4462bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4463 CXXMethodDecl *target) { 4464 /// If we're operating on a base class, the object type is the 4465 /// type of this special member. 4466 QualType objectTy; 4467 AccessSpecifier access = target->getAccess(); 4468 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4469 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4470 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4471 4472 // If we're operating on a field, the object type is the type of the field. 4473 } else { 4474 objectTy = S.Context.getTypeDeclType(target->getParent()); 4475 } 4476 4477 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4478} 4479 4480/// Check whether we should delete a special member due to the implicit 4481/// definition containing a call to a special member of a subobject. 4482bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4483 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4484 bool IsDtorCallInCtor) { 4485 CXXMethodDecl *Decl = SMOR->getMethod(); 4486 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4487 4488 int DiagKind = -1; 4489 4490 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4491 DiagKind = !Decl ? 0 : 1; 4492 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4493 DiagKind = 2; 4494 else if (!isAccessible(Subobj, Decl)) 4495 DiagKind = 3; 4496 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4497 !Decl->isTrivial()) { 4498 // A member of a union must have a trivial corresponding special member. 4499 // As a weird special case, a destructor call from a union's constructor 4500 // must be accessible and non-deleted, but need not be trivial. Such a 4501 // destructor is never actually called, but is semantically checked as 4502 // if it were. 4503 DiagKind = 4; 4504 } 4505 4506 if (DiagKind == -1) 4507 return false; 4508 4509 if (Diagnose) { 4510 if (Field) { 4511 S.Diag(Field->getLocation(), 4512 diag::note_deleted_special_member_class_subobject) 4513 << CSM << MD->getParent() << /*IsField*/true 4514 << Field << DiagKind << IsDtorCallInCtor; 4515 } else { 4516 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4517 S.Diag(Base->getLocStart(), 4518 diag::note_deleted_special_member_class_subobject) 4519 << CSM << MD->getParent() << /*IsField*/false 4520 << Base->getType() << DiagKind << IsDtorCallInCtor; 4521 } 4522 4523 if (DiagKind == 1) 4524 S.NoteDeletedFunction(Decl); 4525 // FIXME: Explain inaccessibility if DiagKind == 3. 4526 } 4527 4528 return true; 4529} 4530 4531/// Check whether we should delete a special member function due to having a 4532/// direct or virtual base class or non-static data member of class type M. 4533bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4534 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4535 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4536 4537 // C++11 [class.ctor]p5: 4538 // -- any direct or virtual base class, or non-static data member with no 4539 // brace-or-equal-initializer, has class type M (or array thereof) and 4540 // either M has no default constructor or overload resolution as applied 4541 // to M's default constructor results in an ambiguity or in a function 4542 // that is deleted or inaccessible 4543 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4544 // -- a direct or virtual base class B that cannot be copied/moved because 4545 // overload resolution, as applied to B's corresponding special member, 4546 // results in an ambiguity or a function that is deleted or inaccessible 4547 // from the defaulted special member 4548 // C++11 [class.dtor]p5: 4549 // -- any direct or virtual base class [...] has a type with a destructor 4550 // that is deleted or inaccessible 4551 if (!(CSM == Sema::CXXDefaultConstructor && 4552 Field && Field->hasInClassInitializer()) && 4553 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4554 return true; 4555 4556 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4557 // -- any direct or virtual base class or non-static data member has a 4558 // type with a destructor that is deleted or inaccessible 4559 if (IsConstructor) { 4560 Sema::SpecialMemberOverloadResult *SMOR = 4561 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4562 false, false, false, false, false); 4563 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4564 return true; 4565 } 4566 4567 return false; 4568} 4569 4570/// Check whether we should delete a special member function due to the class 4571/// having a particular direct or virtual base class. 4572bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4573 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4574 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4575} 4576 4577/// Check whether we should delete a special member function due to the class 4578/// having a particular non-static data member. 4579bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4580 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4581 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4582 4583 if (CSM == Sema::CXXDefaultConstructor) { 4584 // For a default constructor, all references must be initialized in-class 4585 // and, if a union, it must have a non-const member. 4586 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4587 if (Diagnose) 4588 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4589 << MD->getParent() << FD << FieldType << /*Reference*/0; 4590 return true; 4591 } 4592 // C++11 [class.ctor]p5: any non-variant non-static data member of 4593 // const-qualified type (or array thereof) with no 4594 // brace-or-equal-initializer does not have a user-provided default 4595 // constructor. 4596 if (!inUnion() && FieldType.isConstQualified() && 4597 !FD->hasInClassInitializer() && 4598 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4599 if (Diagnose) 4600 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4601 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4602 return true; 4603 } 4604 4605 if (inUnion() && !FieldType.isConstQualified()) 4606 AllFieldsAreConst = false; 4607 } else if (CSM == Sema::CXXCopyConstructor) { 4608 // For a copy constructor, data members must not be of rvalue reference 4609 // type. 4610 if (FieldType->isRValueReferenceType()) { 4611 if (Diagnose) 4612 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4613 << MD->getParent() << FD << FieldType; 4614 return true; 4615 } 4616 } else if (IsAssignment) { 4617 // For an assignment operator, data members must not be of reference type. 4618 if (FieldType->isReferenceType()) { 4619 if (Diagnose) 4620 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4621 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4622 return true; 4623 } 4624 if (!FieldRecord && FieldType.isConstQualified()) { 4625 // C++11 [class.copy]p23: 4626 // -- a non-static data member of const non-class type (or array thereof) 4627 if (Diagnose) 4628 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4629 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4630 return true; 4631 } 4632 } 4633 4634 if (FieldRecord) { 4635 // Some additional restrictions exist on the variant members. 4636 if (!inUnion() && FieldRecord->isUnion() && 4637 FieldRecord->isAnonymousStructOrUnion()) { 4638 bool AllVariantFieldsAreConst = true; 4639 4640 // FIXME: Handle anonymous unions declared within anonymous unions. 4641 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4642 UE = FieldRecord->field_end(); 4643 UI != UE; ++UI) { 4644 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4645 4646 if (!UnionFieldType.isConstQualified()) 4647 AllVariantFieldsAreConst = false; 4648 4649 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4650 if (UnionFieldRecord && 4651 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4652 UnionFieldType.getCVRQualifiers())) 4653 return true; 4654 } 4655 4656 // At least one member in each anonymous union must be non-const 4657 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4658 FieldRecord->field_begin() != FieldRecord->field_end()) { 4659 if (Diagnose) 4660 S.Diag(FieldRecord->getLocation(), 4661 diag::note_deleted_default_ctor_all_const) 4662 << MD->getParent() << /*anonymous union*/1; 4663 return true; 4664 } 4665 4666 // Don't check the implicit member of the anonymous union type. 4667 // This is technically non-conformant, but sanity demands it. 4668 return false; 4669 } 4670 4671 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4672 FieldType.getCVRQualifiers())) 4673 return true; 4674 } 4675 4676 return false; 4677} 4678 4679/// C++11 [class.ctor] p5: 4680/// A defaulted default constructor for a class X is defined as deleted if 4681/// X is a union and all of its variant members are of const-qualified type. 4682bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4683 // This is a silly definition, because it gives an empty union a deleted 4684 // default constructor. Don't do that. 4685 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4686 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4687 if (Diagnose) 4688 S.Diag(MD->getParent()->getLocation(), 4689 diag::note_deleted_default_ctor_all_const) 4690 << MD->getParent() << /*not anonymous union*/0; 4691 return true; 4692 } 4693 return false; 4694} 4695 4696/// Determine whether a defaulted special member function should be defined as 4697/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4698/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4699bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4700 bool Diagnose) { 4701 if (MD->isInvalidDecl()) 4702 return false; 4703 CXXRecordDecl *RD = MD->getParent(); 4704 assert(!RD->isDependentType() && "do deletion after instantiation"); 4705 if (!LangOpts.CPlusPlus0x || RD->isInvalidDecl()) 4706 return false; 4707 4708 // C++11 [expr.lambda.prim]p19: 4709 // The closure type associated with a lambda-expression has a 4710 // deleted (8.4.3) default constructor and a deleted copy 4711 // assignment operator. 4712 if (RD->isLambda() && 4713 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4714 if (Diagnose) 4715 Diag(RD->getLocation(), diag::note_lambda_decl); 4716 return true; 4717 } 4718 4719 // For an anonymous struct or union, the copy and assignment special members 4720 // will never be used, so skip the check. For an anonymous union declared at 4721 // namespace scope, the constructor and destructor are used. 4722 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4723 RD->isAnonymousStructOrUnion()) 4724 return false; 4725 4726 // C++11 [class.copy]p7, p18: 4727 // If the class definition declares a move constructor or move assignment 4728 // operator, an implicitly declared copy constructor or copy assignment 4729 // operator is defined as deleted. 4730 if (MD->isImplicit() && 4731 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4732 CXXMethodDecl *UserDeclaredMove = 0; 4733 4734 // In Microsoft mode, a user-declared move only causes the deletion of the 4735 // corresponding copy operation, not both copy operations. 4736 if (RD->hasUserDeclaredMoveConstructor() && 4737 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4738 if (!Diagnose) return true; 4739 UserDeclaredMove = RD->getMoveConstructor(); 4740 assert(UserDeclaredMove); 4741 } else if (RD->hasUserDeclaredMoveAssignment() && 4742 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4743 if (!Diagnose) return true; 4744 UserDeclaredMove = RD->getMoveAssignmentOperator(); 4745 assert(UserDeclaredMove); 4746 } 4747 4748 if (UserDeclaredMove) { 4749 Diag(UserDeclaredMove->getLocation(), 4750 diag::note_deleted_copy_user_declared_move) 4751 << (CSM == CXXCopyAssignment) << RD 4752 << UserDeclaredMove->isMoveAssignmentOperator(); 4753 return true; 4754 } 4755 } 4756 4757 // Do access control from the special member function 4758 ContextRAII MethodContext(*this, MD); 4759 4760 // C++11 [class.dtor]p5: 4761 // -- for a virtual destructor, lookup of the non-array deallocation function 4762 // results in an ambiguity or in a function that is deleted or inaccessible 4763 if (CSM == CXXDestructor && MD->isVirtual()) { 4764 FunctionDecl *OperatorDelete = 0; 4765 DeclarationName Name = 4766 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4767 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4768 OperatorDelete, false)) { 4769 if (Diagnose) 4770 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4771 return true; 4772 } 4773 } 4774 4775 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4776 4777 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4778 BE = RD->bases_end(); BI != BE; ++BI) 4779 if (!BI->isVirtual() && 4780 SMI.shouldDeleteForBase(BI)) 4781 return true; 4782 4783 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4784 BE = RD->vbases_end(); BI != BE; ++BI) 4785 if (SMI.shouldDeleteForBase(BI)) 4786 return true; 4787 4788 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4789 FE = RD->field_end(); FI != FE; ++FI) 4790 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4791 SMI.shouldDeleteForField(*FI)) 4792 return true; 4793 4794 if (SMI.shouldDeleteForAllConstMembers()) 4795 return true; 4796 4797 return false; 4798} 4799 4800/// \brief Data used with FindHiddenVirtualMethod 4801namespace { 4802 struct FindHiddenVirtualMethodData { 4803 Sema *S; 4804 CXXMethodDecl *Method; 4805 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 4806 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 4807 }; 4808} 4809 4810/// \brief Check whether any most overriden method from MD in Methods 4811static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 4812 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 4813 if (MD->size_overridden_methods() == 0) 4814 return Methods.count(MD->getCanonicalDecl()); 4815 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4816 E = MD->end_overridden_methods(); 4817 I != E; ++I) 4818 if (CheckMostOverridenMethods(*I, Methods)) 4819 return true; 4820 return false; 4821} 4822 4823/// \brief Member lookup function that determines whether a given C++ 4824/// method overloads virtual methods in a base class without overriding any, 4825/// to be used with CXXRecordDecl::lookupInBases(). 4826static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 4827 CXXBasePath &Path, 4828 void *UserData) { 4829 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4830 4831 FindHiddenVirtualMethodData &Data 4832 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 4833 4834 DeclarationName Name = Data.Method->getDeclName(); 4835 assert(Name.getNameKind() == DeclarationName::Identifier); 4836 4837 bool foundSameNameMethod = false; 4838 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 4839 for (Path.Decls = BaseRecord->lookup(Name); 4840 Path.Decls.first != Path.Decls.second; 4841 ++Path.Decls.first) { 4842 NamedDecl *D = *Path.Decls.first; 4843 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4844 MD = MD->getCanonicalDecl(); 4845 foundSameNameMethod = true; 4846 // Interested only in hidden virtual methods. 4847 if (!MD->isVirtual()) 4848 continue; 4849 // If the method we are checking overrides a method from its base 4850 // don't warn about the other overloaded methods. 4851 if (!Data.S->IsOverload(Data.Method, MD, false)) 4852 return true; 4853 // Collect the overload only if its hidden. 4854 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 4855 overloadedMethods.push_back(MD); 4856 } 4857 } 4858 4859 if (foundSameNameMethod) 4860 Data.OverloadedMethods.append(overloadedMethods.begin(), 4861 overloadedMethods.end()); 4862 return foundSameNameMethod; 4863} 4864 4865/// \brief Add the most overriden methods from MD to Methods 4866static void AddMostOverridenMethods(const CXXMethodDecl *MD, 4867 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 4868 if (MD->size_overridden_methods() == 0) 4869 Methods.insert(MD->getCanonicalDecl()); 4870 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 4871 E = MD->end_overridden_methods(); 4872 I != E; ++I) 4873 AddMostOverridenMethods(*I, Methods); 4874} 4875 4876/// \brief See if a method overloads virtual methods in a base class without 4877/// overriding any. 4878void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4879 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 4880 MD->getLocation()) == DiagnosticsEngine::Ignored) 4881 return; 4882 if (!MD->getDeclName().isIdentifier()) 4883 return; 4884 4885 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 4886 /*bool RecordPaths=*/false, 4887 /*bool DetectVirtual=*/false); 4888 FindHiddenVirtualMethodData Data; 4889 Data.Method = MD; 4890 Data.S = this; 4891 4892 // Keep the base methods that were overriden or introduced in the subclass 4893 // by 'using' in a set. A base method not in this set is hidden. 4894 for (DeclContext::lookup_result res = DC->lookup(MD->getDeclName()); 4895 res.first != res.second; ++res.first) { 4896 NamedDecl *ND = *res.first; 4897 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*res.first)) 4898 ND = shad->getTargetDecl(); 4899 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 4900 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 4901 } 4902 4903 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 4904 !Data.OverloadedMethods.empty()) { 4905 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 4906 << MD << (Data.OverloadedMethods.size() > 1); 4907 4908 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 4909 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 4910 Diag(overloadedMD->getLocation(), 4911 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 4912 } 4913 } 4914} 4915 4916void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 4917 Decl *TagDecl, 4918 SourceLocation LBrac, 4919 SourceLocation RBrac, 4920 AttributeList *AttrList) { 4921 if (!TagDecl) 4922 return; 4923 4924 AdjustDeclIfTemplate(TagDecl); 4925 4926 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 4927 if (l->getKind() != AttributeList::AT_Visibility) 4928 continue; 4929 l->setInvalid(); 4930 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 4931 l->getName(); 4932 } 4933 4934 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 4935 // strict aliasing violation! 4936 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 4937 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 4938 4939 CheckCompletedCXXClass( 4940 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 4941} 4942 4943/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 4944/// special functions, such as the default constructor, copy 4945/// constructor, or destructor, to the given C++ class (C++ 4946/// [special]p1). This routine can only be executed just before the 4947/// definition of the class is complete. 4948void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 4949 if (!ClassDecl->hasUserDeclaredConstructor()) 4950 ++ASTContext::NumImplicitDefaultConstructors; 4951 4952 if (!ClassDecl->hasUserDeclaredCopyConstructor()) 4953 ++ASTContext::NumImplicitCopyConstructors; 4954 4955 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveConstructor()) 4956 ++ASTContext::NumImplicitMoveConstructors; 4957 4958 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 4959 ++ASTContext::NumImplicitCopyAssignmentOperators; 4960 4961 // If we have a dynamic class, then the copy assignment operator may be 4962 // virtual, so we have to declare it immediately. This ensures that, e.g., 4963 // it shows up in the right place in the vtable and that we diagnose 4964 // problems with the implicit exception specification. 4965 if (ClassDecl->isDynamicClass()) 4966 DeclareImplicitCopyAssignment(ClassDecl); 4967 } 4968 4969 if (getLangOpts().CPlusPlus0x && ClassDecl->needsImplicitMoveAssignment()) { 4970 ++ASTContext::NumImplicitMoveAssignmentOperators; 4971 4972 // Likewise for the move assignment operator. 4973 if (ClassDecl->isDynamicClass()) 4974 DeclareImplicitMoveAssignment(ClassDecl); 4975 } 4976 4977 if (!ClassDecl->hasUserDeclaredDestructor()) { 4978 ++ASTContext::NumImplicitDestructors; 4979 4980 // If we have a dynamic class, then the destructor may be virtual, so we 4981 // have to declare the destructor immediately. This ensures that, e.g., it 4982 // shows up in the right place in the vtable and that we diagnose problems 4983 // with the implicit exception specification. 4984 if (ClassDecl->isDynamicClass()) 4985 DeclareImplicitDestructor(ClassDecl); 4986 } 4987} 4988 4989void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 4990 if (!D) 4991 return; 4992 4993 int NumParamList = D->getNumTemplateParameterLists(); 4994 for (int i = 0; i < NumParamList; i++) { 4995 TemplateParameterList* Params = D->getTemplateParameterList(i); 4996 for (TemplateParameterList::iterator Param = Params->begin(), 4997 ParamEnd = Params->end(); 4998 Param != ParamEnd; ++Param) { 4999 NamedDecl *Named = cast<NamedDecl>(*Param); 5000 if (Named->getDeclName()) { 5001 S->AddDecl(Named); 5002 IdResolver.AddDecl(Named); 5003 } 5004 } 5005 } 5006} 5007 5008void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5009 if (!D) 5010 return; 5011 5012 TemplateParameterList *Params = 0; 5013 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5014 Params = Template->getTemplateParameters(); 5015 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5016 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5017 Params = PartialSpec->getTemplateParameters(); 5018 else 5019 return; 5020 5021 for (TemplateParameterList::iterator Param = Params->begin(), 5022 ParamEnd = Params->end(); 5023 Param != ParamEnd; ++Param) { 5024 NamedDecl *Named = cast<NamedDecl>(*Param); 5025 if (Named->getDeclName()) { 5026 S->AddDecl(Named); 5027 IdResolver.AddDecl(Named); 5028 } 5029 } 5030} 5031 5032void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5033 if (!RecordD) return; 5034 AdjustDeclIfTemplate(RecordD); 5035 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5036 PushDeclContext(S, Record); 5037} 5038 5039void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5040 if (!RecordD) return; 5041 PopDeclContext(); 5042} 5043 5044/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5045/// parsing a top-level (non-nested) C++ class, and we are now 5046/// parsing those parts of the given Method declaration that could 5047/// not be parsed earlier (C++ [class.mem]p2), such as default 5048/// arguments. This action should enter the scope of the given 5049/// Method declaration as if we had just parsed the qualified method 5050/// name. However, it should not bring the parameters into scope; 5051/// that will be performed by ActOnDelayedCXXMethodParameter. 5052void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5053} 5054 5055/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5056/// C++ method declaration. We're (re-)introducing the given 5057/// function parameter into scope for use in parsing later parts of 5058/// the method declaration. For example, we could see an 5059/// ActOnParamDefaultArgument event for this parameter. 5060void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5061 if (!ParamD) 5062 return; 5063 5064 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5065 5066 // If this parameter has an unparsed default argument, clear it out 5067 // to make way for the parsed default argument. 5068 if (Param->hasUnparsedDefaultArg()) 5069 Param->setDefaultArg(0); 5070 5071 S->AddDecl(Param); 5072 if (Param->getDeclName()) 5073 IdResolver.AddDecl(Param); 5074} 5075 5076/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5077/// processing the delayed method declaration for Method. The method 5078/// declaration is now considered finished. There may be a separate 5079/// ActOnStartOfFunctionDef action later (not necessarily 5080/// immediately!) for this method, if it was also defined inside the 5081/// class body. 5082void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5083 if (!MethodD) 5084 return; 5085 5086 AdjustDeclIfTemplate(MethodD); 5087 5088 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5089 5090 // Now that we have our default arguments, check the constructor 5091 // again. It could produce additional diagnostics or affect whether 5092 // the class has implicitly-declared destructors, among other 5093 // things. 5094 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5095 CheckConstructor(Constructor); 5096 5097 // Check the default arguments, which we may have added. 5098 if (!Method->isInvalidDecl()) 5099 CheckCXXDefaultArguments(Method); 5100} 5101 5102/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5103/// the well-formedness of the constructor declarator @p D with type @p 5104/// R. If there are any errors in the declarator, this routine will 5105/// emit diagnostics and set the invalid bit to true. In any case, the type 5106/// will be updated to reflect a well-formed type for the constructor and 5107/// returned. 5108QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5109 StorageClass &SC) { 5110 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5111 5112 // C++ [class.ctor]p3: 5113 // A constructor shall not be virtual (10.3) or static (9.4). A 5114 // constructor can be invoked for a const, volatile or const 5115 // volatile object. A constructor shall not be declared const, 5116 // volatile, or const volatile (9.3.2). 5117 if (isVirtual) { 5118 if (!D.isInvalidType()) 5119 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5120 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5121 << SourceRange(D.getIdentifierLoc()); 5122 D.setInvalidType(); 5123 } 5124 if (SC == SC_Static) { 5125 if (!D.isInvalidType()) 5126 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5127 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5128 << SourceRange(D.getIdentifierLoc()); 5129 D.setInvalidType(); 5130 SC = SC_None; 5131 } 5132 5133 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5134 if (FTI.TypeQuals != 0) { 5135 if (FTI.TypeQuals & Qualifiers::Const) 5136 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5137 << "const" << SourceRange(D.getIdentifierLoc()); 5138 if (FTI.TypeQuals & Qualifiers::Volatile) 5139 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5140 << "volatile" << SourceRange(D.getIdentifierLoc()); 5141 if (FTI.TypeQuals & Qualifiers::Restrict) 5142 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5143 << "restrict" << SourceRange(D.getIdentifierLoc()); 5144 D.setInvalidType(); 5145 } 5146 5147 // C++0x [class.ctor]p4: 5148 // A constructor shall not be declared with a ref-qualifier. 5149 if (FTI.hasRefQualifier()) { 5150 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5151 << FTI.RefQualifierIsLValueRef 5152 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5153 D.setInvalidType(); 5154 } 5155 5156 // Rebuild the function type "R" without any type qualifiers (in 5157 // case any of the errors above fired) and with "void" as the 5158 // return type, since constructors don't have return types. 5159 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5160 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5161 return R; 5162 5163 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5164 EPI.TypeQuals = 0; 5165 EPI.RefQualifier = RQ_None; 5166 5167 return Context.getFunctionType(Context.VoidTy, Proto->arg_type_begin(), 5168 Proto->getNumArgs(), EPI); 5169} 5170 5171/// CheckConstructor - Checks a fully-formed constructor for 5172/// well-formedness, issuing any diagnostics required. Returns true if 5173/// the constructor declarator is invalid. 5174void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5175 CXXRecordDecl *ClassDecl 5176 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5177 if (!ClassDecl) 5178 return Constructor->setInvalidDecl(); 5179 5180 // C++ [class.copy]p3: 5181 // A declaration of a constructor for a class X is ill-formed if 5182 // its first parameter is of type (optionally cv-qualified) X and 5183 // either there are no other parameters or else all other 5184 // parameters have default arguments. 5185 if (!Constructor->isInvalidDecl() && 5186 ((Constructor->getNumParams() == 1) || 5187 (Constructor->getNumParams() > 1 && 5188 Constructor->getParamDecl(1)->hasDefaultArg())) && 5189 Constructor->getTemplateSpecializationKind() 5190 != TSK_ImplicitInstantiation) { 5191 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5192 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5193 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5194 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5195 const char *ConstRef 5196 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5197 : " const &"; 5198 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5199 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5200 5201 // FIXME: Rather that making the constructor invalid, we should endeavor 5202 // to fix the type. 5203 Constructor->setInvalidDecl(); 5204 } 5205 } 5206} 5207 5208/// CheckDestructor - Checks a fully-formed destructor definition for 5209/// well-formedness, issuing any diagnostics required. Returns true 5210/// on error. 5211bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5212 CXXRecordDecl *RD = Destructor->getParent(); 5213 5214 if (Destructor->isVirtual()) { 5215 SourceLocation Loc; 5216 5217 if (!Destructor->isImplicit()) 5218 Loc = Destructor->getLocation(); 5219 else 5220 Loc = RD->getLocation(); 5221 5222 // If we have a virtual destructor, look up the deallocation function 5223 FunctionDecl *OperatorDelete = 0; 5224 DeclarationName Name = 5225 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5226 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5227 return true; 5228 5229 MarkFunctionReferenced(Loc, OperatorDelete); 5230 5231 Destructor->setOperatorDelete(OperatorDelete); 5232 } 5233 5234 return false; 5235} 5236 5237static inline bool 5238FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5239 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5240 FTI.ArgInfo[0].Param && 5241 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5242} 5243 5244/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5245/// the well-formednes of the destructor declarator @p D with type @p 5246/// R. If there are any errors in the declarator, this routine will 5247/// emit diagnostics and set the declarator to invalid. Even if this happens, 5248/// will be updated to reflect a well-formed type for the destructor and 5249/// returned. 5250QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5251 StorageClass& SC) { 5252 // C++ [class.dtor]p1: 5253 // [...] A typedef-name that names a class is a class-name 5254 // (7.1.3); however, a typedef-name that names a class shall not 5255 // be used as the identifier in the declarator for a destructor 5256 // declaration. 5257 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5258 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5259 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5260 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5261 else if (const TemplateSpecializationType *TST = 5262 DeclaratorType->getAs<TemplateSpecializationType>()) 5263 if (TST->isTypeAlias()) 5264 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5265 << DeclaratorType << 1; 5266 5267 // C++ [class.dtor]p2: 5268 // A destructor is used to destroy objects of its class type. A 5269 // destructor takes no parameters, and no return type can be 5270 // specified for it (not even void). The address of a destructor 5271 // shall not be taken. A destructor shall not be static. A 5272 // destructor can be invoked for a const, volatile or const 5273 // volatile object. A destructor shall not be declared const, 5274 // volatile or const volatile (9.3.2). 5275 if (SC == SC_Static) { 5276 if (!D.isInvalidType()) 5277 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5278 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5279 << SourceRange(D.getIdentifierLoc()) 5280 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5281 5282 SC = SC_None; 5283 } 5284 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5285 // Destructors don't have return types, but the parser will 5286 // happily parse something like: 5287 // 5288 // class X { 5289 // float ~X(); 5290 // }; 5291 // 5292 // The return type will be eliminated later. 5293 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5294 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5295 << SourceRange(D.getIdentifierLoc()); 5296 } 5297 5298 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5299 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5300 if (FTI.TypeQuals & Qualifiers::Const) 5301 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5302 << "const" << SourceRange(D.getIdentifierLoc()); 5303 if (FTI.TypeQuals & Qualifiers::Volatile) 5304 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5305 << "volatile" << SourceRange(D.getIdentifierLoc()); 5306 if (FTI.TypeQuals & Qualifiers::Restrict) 5307 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5308 << "restrict" << SourceRange(D.getIdentifierLoc()); 5309 D.setInvalidType(); 5310 } 5311 5312 // C++0x [class.dtor]p2: 5313 // A destructor shall not be declared with a ref-qualifier. 5314 if (FTI.hasRefQualifier()) { 5315 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5316 << FTI.RefQualifierIsLValueRef 5317 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5318 D.setInvalidType(); 5319 } 5320 5321 // Make sure we don't have any parameters. 5322 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5323 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5324 5325 // Delete the parameters. 5326 FTI.freeArgs(); 5327 D.setInvalidType(); 5328 } 5329 5330 // Make sure the destructor isn't variadic. 5331 if (FTI.isVariadic) { 5332 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5333 D.setInvalidType(); 5334 } 5335 5336 // Rebuild the function type "R" without any type qualifiers or 5337 // parameters (in case any of the errors above fired) and with 5338 // "void" as the return type, since destructors don't have return 5339 // types. 5340 if (!D.isInvalidType()) 5341 return R; 5342 5343 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5344 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5345 EPI.Variadic = false; 5346 EPI.TypeQuals = 0; 5347 EPI.RefQualifier = RQ_None; 5348 return Context.getFunctionType(Context.VoidTy, 0, 0, EPI); 5349} 5350 5351/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5352/// well-formednes of the conversion function declarator @p D with 5353/// type @p R. If there are any errors in the declarator, this routine 5354/// will emit diagnostics and return true. Otherwise, it will return 5355/// false. Either way, the type @p R will be updated to reflect a 5356/// well-formed type for the conversion operator. 5357void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5358 StorageClass& SC) { 5359 // C++ [class.conv.fct]p1: 5360 // Neither parameter types nor return type can be specified. The 5361 // type of a conversion function (8.3.5) is "function taking no 5362 // parameter returning conversion-type-id." 5363 if (SC == SC_Static) { 5364 if (!D.isInvalidType()) 5365 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5366 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5367 << SourceRange(D.getIdentifierLoc()); 5368 D.setInvalidType(); 5369 SC = SC_None; 5370 } 5371 5372 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5373 5374 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5375 // Conversion functions don't have return types, but the parser will 5376 // happily parse something like: 5377 // 5378 // class X { 5379 // float operator bool(); 5380 // }; 5381 // 5382 // The return type will be changed later anyway. 5383 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5384 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5385 << SourceRange(D.getIdentifierLoc()); 5386 D.setInvalidType(); 5387 } 5388 5389 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5390 5391 // Make sure we don't have any parameters. 5392 if (Proto->getNumArgs() > 0) { 5393 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5394 5395 // Delete the parameters. 5396 D.getFunctionTypeInfo().freeArgs(); 5397 D.setInvalidType(); 5398 } else if (Proto->isVariadic()) { 5399 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5400 D.setInvalidType(); 5401 } 5402 5403 // Diagnose "&operator bool()" and other such nonsense. This 5404 // is actually a gcc extension which we don't support. 5405 if (Proto->getResultType() != ConvType) { 5406 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5407 << Proto->getResultType(); 5408 D.setInvalidType(); 5409 ConvType = Proto->getResultType(); 5410 } 5411 5412 // C++ [class.conv.fct]p4: 5413 // The conversion-type-id shall not represent a function type nor 5414 // an array type. 5415 if (ConvType->isArrayType()) { 5416 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5417 ConvType = Context.getPointerType(ConvType); 5418 D.setInvalidType(); 5419 } else if (ConvType->isFunctionType()) { 5420 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5421 ConvType = Context.getPointerType(ConvType); 5422 D.setInvalidType(); 5423 } 5424 5425 // Rebuild the function type "R" without any parameters (in case any 5426 // of the errors above fired) and with the conversion type as the 5427 // return type. 5428 if (D.isInvalidType()) 5429 R = Context.getFunctionType(ConvType, 0, 0, Proto->getExtProtoInfo()); 5430 5431 // C++0x explicit conversion operators. 5432 if (D.getDeclSpec().isExplicitSpecified()) 5433 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5434 getLangOpts().CPlusPlus0x ? 5435 diag::warn_cxx98_compat_explicit_conversion_functions : 5436 diag::ext_explicit_conversion_functions) 5437 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5438} 5439 5440/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5441/// the declaration of the given C++ conversion function. This routine 5442/// is responsible for recording the conversion function in the C++ 5443/// class, if possible. 5444Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5445 assert(Conversion && "Expected to receive a conversion function declaration"); 5446 5447 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5448 5449 // Make sure we aren't redeclaring the conversion function. 5450 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5451 5452 // C++ [class.conv.fct]p1: 5453 // [...] A conversion function is never used to convert a 5454 // (possibly cv-qualified) object to the (possibly cv-qualified) 5455 // same object type (or a reference to it), to a (possibly 5456 // cv-qualified) base class of that type (or a reference to it), 5457 // or to (possibly cv-qualified) void. 5458 // FIXME: Suppress this warning if the conversion function ends up being a 5459 // virtual function that overrides a virtual function in a base class. 5460 QualType ClassType 5461 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5462 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5463 ConvType = ConvTypeRef->getPointeeType(); 5464 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5465 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5466 /* Suppress diagnostics for instantiations. */; 5467 else if (ConvType->isRecordType()) { 5468 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5469 if (ConvType == ClassType) 5470 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5471 << ClassType; 5472 else if (IsDerivedFrom(ClassType, ConvType)) 5473 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5474 << ClassType << ConvType; 5475 } else if (ConvType->isVoidType()) { 5476 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5477 << ClassType << ConvType; 5478 } 5479 5480 if (FunctionTemplateDecl *ConversionTemplate 5481 = Conversion->getDescribedFunctionTemplate()) 5482 return ConversionTemplate; 5483 5484 return Conversion; 5485} 5486 5487//===----------------------------------------------------------------------===// 5488// Namespace Handling 5489//===----------------------------------------------------------------------===// 5490 5491/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 5492/// reopened. 5493static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 5494 SourceLocation Loc, 5495 IdentifierInfo *II, bool *IsInline, 5496 NamespaceDecl *PrevNS) { 5497 assert(*IsInline != PrevNS->isInline()); 5498 5499 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 5500 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 5501 // inline namespaces, with the intention of bringing names into namespace std. 5502 // 5503 // We support this just well enough to get that case working; this is not 5504 // sufficient to support reopening namespaces as inline in general. 5505 if (*IsInline && II && II->getName().startswith("__atomic") && 5506 S.getSourceManager().isInSystemHeader(Loc)) { 5507 // Mark all prior declarations of the namespace as inline. 5508 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 5509 NS = NS->getPreviousDecl()) 5510 NS->setInline(*IsInline); 5511 // Patch up the lookup table for the containing namespace. This isn't really 5512 // correct, but it's good enough for this particular case. 5513 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 5514 E = PrevNS->decls_end(); I != E; ++I) 5515 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 5516 PrevNS->getParent()->makeDeclVisibleInContext(ND); 5517 return; 5518 } 5519 5520 if (PrevNS->isInline()) 5521 // The user probably just forgot the 'inline', so suggest that it 5522 // be added back. 5523 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 5524 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 5525 else 5526 S.Diag(Loc, diag::err_inline_namespace_mismatch) 5527 << IsInline; 5528 5529 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 5530 *IsInline = PrevNS->isInline(); 5531} 5532 5533/// ActOnStartNamespaceDef - This is called at the start of a namespace 5534/// definition. 5535Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 5536 SourceLocation InlineLoc, 5537 SourceLocation NamespaceLoc, 5538 SourceLocation IdentLoc, 5539 IdentifierInfo *II, 5540 SourceLocation LBrace, 5541 AttributeList *AttrList) { 5542 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 5543 // For anonymous namespace, take the location of the left brace. 5544 SourceLocation Loc = II ? IdentLoc : LBrace; 5545 bool IsInline = InlineLoc.isValid(); 5546 bool IsInvalid = false; 5547 bool IsStd = false; 5548 bool AddToKnown = false; 5549 Scope *DeclRegionScope = NamespcScope->getParent(); 5550 5551 NamespaceDecl *PrevNS = 0; 5552 if (II) { 5553 // C++ [namespace.def]p2: 5554 // The identifier in an original-namespace-definition shall not 5555 // have been previously defined in the declarative region in 5556 // which the original-namespace-definition appears. The 5557 // identifier in an original-namespace-definition is the name of 5558 // the namespace. Subsequently in that declarative region, it is 5559 // treated as an original-namespace-name. 5560 // 5561 // Since namespace names are unique in their scope, and we don't 5562 // look through using directives, just look for any ordinary names. 5563 5564 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 5565 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 5566 Decl::IDNS_Namespace; 5567 NamedDecl *PrevDecl = 0; 5568 for (DeclContext::lookup_result R 5569 = CurContext->getRedeclContext()->lookup(II); 5570 R.first != R.second; ++R.first) { 5571 if ((*R.first)->getIdentifierNamespace() & IDNS) { 5572 PrevDecl = *R.first; 5573 break; 5574 } 5575 } 5576 5577 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 5578 5579 if (PrevNS) { 5580 // This is an extended namespace definition. 5581 if (IsInline != PrevNS->isInline()) 5582 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 5583 &IsInline, PrevNS); 5584 } else if (PrevDecl) { 5585 // This is an invalid name redefinition. 5586 Diag(Loc, diag::err_redefinition_different_kind) 5587 << II; 5588 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5589 IsInvalid = true; 5590 // Continue on to push Namespc as current DeclContext and return it. 5591 } else if (II->isStr("std") && 5592 CurContext->getRedeclContext()->isTranslationUnit()) { 5593 // This is the first "real" definition of the namespace "std", so update 5594 // our cache of the "std" namespace to point at this definition. 5595 PrevNS = getStdNamespace(); 5596 IsStd = true; 5597 AddToKnown = !IsInline; 5598 } else { 5599 // We've seen this namespace for the first time. 5600 AddToKnown = !IsInline; 5601 } 5602 } else { 5603 // Anonymous namespaces. 5604 5605 // Determine whether the parent already has an anonymous namespace. 5606 DeclContext *Parent = CurContext->getRedeclContext(); 5607 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5608 PrevNS = TU->getAnonymousNamespace(); 5609 } else { 5610 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 5611 PrevNS = ND->getAnonymousNamespace(); 5612 } 5613 5614 if (PrevNS && IsInline != PrevNS->isInline()) 5615 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 5616 &IsInline, PrevNS); 5617 } 5618 5619 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 5620 StartLoc, Loc, II, PrevNS); 5621 if (IsInvalid) 5622 Namespc->setInvalidDecl(); 5623 5624 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 5625 5626 // FIXME: Should we be merging attributes? 5627 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 5628 PushNamespaceVisibilityAttr(Attr, Loc); 5629 5630 if (IsStd) 5631 StdNamespace = Namespc; 5632 if (AddToKnown) 5633 KnownNamespaces[Namespc] = false; 5634 5635 if (II) { 5636 PushOnScopeChains(Namespc, DeclRegionScope); 5637 } else { 5638 // Link the anonymous namespace into its parent. 5639 DeclContext *Parent = CurContext->getRedeclContext(); 5640 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 5641 TU->setAnonymousNamespace(Namespc); 5642 } else { 5643 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 5644 } 5645 5646 CurContext->addDecl(Namespc); 5647 5648 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 5649 // behaves as if it were replaced by 5650 // namespace unique { /* empty body */ } 5651 // using namespace unique; 5652 // namespace unique { namespace-body } 5653 // where all occurrences of 'unique' in a translation unit are 5654 // replaced by the same identifier and this identifier differs 5655 // from all other identifiers in the entire program. 5656 5657 // We just create the namespace with an empty name and then add an 5658 // implicit using declaration, just like the standard suggests. 5659 // 5660 // CodeGen enforces the "universally unique" aspect by giving all 5661 // declarations semantically contained within an anonymous 5662 // namespace internal linkage. 5663 5664 if (!PrevNS) { 5665 UsingDirectiveDecl* UD 5666 = UsingDirectiveDecl::Create(Context, Parent, 5667 /* 'using' */ LBrace, 5668 /* 'namespace' */ SourceLocation(), 5669 /* qualifier */ NestedNameSpecifierLoc(), 5670 /* identifier */ SourceLocation(), 5671 Namespc, 5672 /* Ancestor */ Parent); 5673 UD->setImplicit(); 5674 Parent->addDecl(UD); 5675 } 5676 } 5677 5678 ActOnDocumentableDecl(Namespc); 5679 5680 // Although we could have an invalid decl (i.e. the namespace name is a 5681 // redefinition), push it as current DeclContext and try to continue parsing. 5682 // FIXME: We should be able to push Namespc here, so that the each DeclContext 5683 // for the namespace has the declarations that showed up in that particular 5684 // namespace definition. 5685 PushDeclContext(NamespcScope, Namespc); 5686 return Namespc; 5687} 5688 5689/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 5690/// is a namespace alias, returns the namespace it points to. 5691static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 5692 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 5693 return AD->getNamespace(); 5694 return dyn_cast_or_null<NamespaceDecl>(D); 5695} 5696 5697/// ActOnFinishNamespaceDef - This callback is called after a namespace is 5698/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 5699void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 5700 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 5701 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 5702 Namespc->setRBraceLoc(RBrace); 5703 PopDeclContext(); 5704 if (Namespc->hasAttr<VisibilityAttr>()) 5705 PopPragmaVisibility(true, RBrace); 5706} 5707 5708CXXRecordDecl *Sema::getStdBadAlloc() const { 5709 return cast_or_null<CXXRecordDecl>( 5710 StdBadAlloc.get(Context.getExternalSource())); 5711} 5712 5713NamespaceDecl *Sema::getStdNamespace() const { 5714 return cast_or_null<NamespaceDecl>( 5715 StdNamespace.get(Context.getExternalSource())); 5716} 5717 5718/// \brief Retrieve the special "std" namespace, which may require us to 5719/// implicitly define the namespace. 5720NamespaceDecl *Sema::getOrCreateStdNamespace() { 5721 if (!StdNamespace) { 5722 // The "std" namespace has not yet been defined, so build one implicitly. 5723 StdNamespace = NamespaceDecl::Create(Context, 5724 Context.getTranslationUnitDecl(), 5725 /*Inline=*/false, 5726 SourceLocation(), SourceLocation(), 5727 &PP.getIdentifierTable().get("std"), 5728 /*PrevDecl=*/0); 5729 getStdNamespace()->setImplicit(true); 5730 } 5731 5732 return getStdNamespace(); 5733} 5734 5735bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 5736 assert(getLangOpts().CPlusPlus && 5737 "Looking for std::initializer_list outside of C++."); 5738 5739 // We're looking for implicit instantiations of 5740 // template <typename E> class std::initializer_list. 5741 5742 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 5743 return false; 5744 5745 ClassTemplateDecl *Template = 0; 5746 const TemplateArgument *Arguments = 0; 5747 5748 if (const RecordType *RT = Ty->getAs<RecordType>()) { 5749 5750 ClassTemplateSpecializationDecl *Specialization = 5751 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 5752 if (!Specialization) 5753 return false; 5754 5755 Template = Specialization->getSpecializedTemplate(); 5756 Arguments = Specialization->getTemplateArgs().data(); 5757 } else if (const TemplateSpecializationType *TST = 5758 Ty->getAs<TemplateSpecializationType>()) { 5759 Template = dyn_cast_or_null<ClassTemplateDecl>( 5760 TST->getTemplateName().getAsTemplateDecl()); 5761 Arguments = TST->getArgs(); 5762 } 5763 if (!Template) 5764 return false; 5765 5766 if (!StdInitializerList) { 5767 // Haven't recognized std::initializer_list yet, maybe this is it. 5768 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 5769 if (TemplateClass->getIdentifier() != 5770 &PP.getIdentifierTable().get("initializer_list") || 5771 !getStdNamespace()->InEnclosingNamespaceSetOf( 5772 TemplateClass->getDeclContext())) 5773 return false; 5774 // This is a template called std::initializer_list, but is it the right 5775 // template? 5776 TemplateParameterList *Params = Template->getTemplateParameters(); 5777 if (Params->getMinRequiredArguments() != 1) 5778 return false; 5779 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 5780 return false; 5781 5782 // It's the right template. 5783 StdInitializerList = Template; 5784 } 5785 5786 if (Template != StdInitializerList) 5787 return false; 5788 5789 // This is an instance of std::initializer_list. Find the argument type. 5790 if (Element) 5791 *Element = Arguments[0].getAsType(); 5792 return true; 5793} 5794 5795static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 5796 NamespaceDecl *Std = S.getStdNamespace(); 5797 if (!Std) { 5798 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5799 return 0; 5800 } 5801 5802 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 5803 Loc, Sema::LookupOrdinaryName); 5804 if (!S.LookupQualifiedName(Result, Std)) { 5805 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 5806 return 0; 5807 } 5808 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 5809 if (!Template) { 5810 Result.suppressDiagnostics(); 5811 // We found something weird. Complain about the first thing we found. 5812 NamedDecl *Found = *Result.begin(); 5813 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 5814 return 0; 5815 } 5816 5817 // We found some template called std::initializer_list. Now verify that it's 5818 // correct. 5819 TemplateParameterList *Params = Template->getTemplateParameters(); 5820 if (Params->getMinRequiredArguments() != 1 || 5821 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 5822 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 5823 return 0; 5824 } 5825 5826 return Template; 5827} 5828 5829QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 5830 if (!StdInitializerList) { 5831 StdInitializerList = LookupStdInitializerList(*this, Loc); 5832 if (!StdInitializerList) 5833 return QualType(); 5834 } 5835 5836 TemplateArgumentListInfo Args(Loc, Loc); 5837 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 5838 Context.getTrivialTypeSourceInfo(Element, 5839 Loc))); 5840 return Context.getCanonicalType( 5841 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 5842} 5843 5844bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 5845 // C++ [dcl.init.list]p2: 5846 // A constructor is an initializer-list constructor if its first parameter 5847 // is of type std::initializer_list<E> or reference to possibly cv-qualified 5848 // std::initializer_list<E> for some type E, and either there are no other 5849 // parameters or else all other parameters have default arguments. 5850 if (Ctor->getNumParams() < 1 || 5851 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 5852 return false; 5853 5854 QualType ArgType = Ctor->getParamDecl(0)->getType(); 5855 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 5856 ArgType = RT->getPointeeType().getUnqualifiedType(); 5857 5858 return isStdInitializerList(ArgType, 0); 5859} 5860 5861/// \brief Determine whether a using statement is in a context where it will be 5862/// apply in all contexts. 5863static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 5864 switch (CurContext->getDeclKind()) { 5865 case Decl::TranslationUnit: 5866 return true; 5867 case Decl::LinkageSpec: 5868 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 5869 default: 5870 return false; 5871 } 5872} 5873 5874namespace { 5875 5876// Callback to only accept typo corrections that are namespaces. 5877class NamespaceValidatorCCC : public CorrectionCandidateCallback { 5878 public: 5879 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 5880 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 5881 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 5882 } 5883 return false; 5884 } 5885}; 5886 5887} 5888 5889static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 5890 CXXScopeSpec &SS, 5891 SourceLocation IdentLoc, 5892 IdentifierInfo *Ident) { 5893 NamespaceValidatorCCC Validator; 5894 R.clear(); 5895 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 5896 R.getLookupKind(), Sc, &SS, 5897 Validator)) { 5898 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 5899 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 5900 if (DeclContext *DC = S.computeDeclContext(SS, false)) 5901 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 5902 << Ident << DC << CorrectedQuotedStr << SS.getRange() 5903 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 5904 CorrectedStr); 5905 else 5906 S.Diag(IdentLoc, diag::err_using_directive_suggest) 5907 << Ident << CorrectedQuotedStr 5908 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 5909 5910 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 5911 diag::note_namespace_defined_here) << CorrectedQuotedStr; 5912 5913 R.addDecl(Corrected.getCorrectionDecl()); 5914 return true; 5915 } 5916 return false; 5917} 5918 5919Decl *Sema::ActOnUsingDirective(Scope *S, 5920 SourceLocation UsingLoc, 5921 SourceLocation NamespcLoc, 5922 CXXScopeSpec &SS, 5923 SourceLocation IdentLoc, 5924 IdentifierInfo *NamespcName, 5925 AttributeList *AttrList) { 5926 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 5927 assert(NamespcName && "Invalid NamespcName."); 5928 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 5929 5930 // This can only happen along a recovery path. 5931 while (S->getFlags() & Scope::TemplateParamScope) 5932 S = S->getParent(); 5933 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 5934 5935 UsingDirectiveDecl *UDir = 0; 5936 NestedNameSpecifier *Qualifier = 0; 5937 if (SS.isSet()) 5938 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5939 5940 // Lookup namespace name. 5941 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 5942 LookupParsedName(R, S, &SS); 5943 if (R.isAmbiguous()) 5944 return 0; 5945 5946 if (R.empty()) { 5947 R.clear(); 5948 // Allow "using namespace std;" or "using namespace ::std;" even if 5949 // "std" hasn't been defined yet, for GCC compatibility. 5950 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 5951 NamespcName->isStr("std")) { 5952 Diag(IdentLoc, diag::ext_using_undefined_std); 5953 R.addDecl(getOrCreateStdNamespace()); 5954 R.resolveKind(); 5955 } 5956 // Otherwise, attempt typo correction. 5957 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 5958 } 5959 5960 if (!R.empty()) { 5961 NamedDecl *Named = R.getFoundDecl(); 5962 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 5963 && "expected namespace decl"); 5964 // C++ [namespace.udir]p1: 5965 // A using-directive specifies that the names in the nominated 5966 // namespace can be used in the scope in which the 5967 // using-directive appears after the using-directive. During 5968 // unqualified name lookup (3.4.1), the names appear as if they 5969 // were declared in the nearest enclosing namespace which 5970 // contains both the using-directive and the nominated 5971 // namespace. [Note: in this context, "contains" means "contains 5972 // directly or indirectly". ] 5973 5974 // Find enclosing context containing both using-directive and 5975 // nominated namespace. 5976 NamespaceDecl *NS = getNamespaceDecl(Named); 5977 DeclContext *CommonAncestor = cast<DeclContext>(NS); 5978 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 5979 CommonAncestor = CommonAncestor->getParent(); 5980 5981 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 5982 SS.getWithLocInContext(Context), 5983 IdentLoc, Named, CommonAncestor); 5984 5985 if (IsUsingDirectiveInToplevelContext(CurContext) && 5986 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 5987 Diag(IdentLoc, diag::warn_using_directive_in_header); 5988 } 5989 5990 PushUsingDirective(S, UDir); 5991 } else { 5992 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 5993 } 5994 5995 // FIXME: We ignore attributes for now. 5996 return UDir; 5997} 5998 5999void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6000 // If the scope has an associated entity and the using directive is at 6001 // namespace or translation unit scope, add the UsingDirectiveDecl into 6002 // its lookup structure so qualified name lookup can find it. 6003 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6004 if (Ctx && !Ctx->isFunctionOrMethod()) 6005 Ctx->addDecl(UDir); 6006 else 6007 // Otherwise, it is at block sope. The using-directives will affect lookup 6008 // only to the end of the scope. 6009 S->PushUsingDirective(UDir); 6010} 6011 6012 6013Decl *Sema::ActOnUsingDeclaration(Scope *S, 6014 AccessSpecifier AS, 6015 bool HasUsingKeyword, 6016 SourceLocation UsingLoc, 6017 CXXScopeSpec &SS, 6018 UnqualifiedId &Name, 6019 AttributeList *AttrList, 6020 bool IsTypeName, 6021 SourceLocation TypenameLoc) { 6022 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6023 6024 switch (Name.getKind()) { 6025 case UnqualifiedId::IK_ImplicitSelfParam: 6026 case UnqualifiedId::IK_Identifier: 6027 case UnqualifiedId::IK_OperatorFunctionId: 6028 case UnqualifiedId::IK_LiteralOperatorId: 6029 case UnqualifiedId::IK_ConversionFunctionId: 6030 break; 6031 6032 case UnqualifiedId::IK_ConstructorName: 6033 case UnqualifiedId::IK_ConstructorTemplateId: 6034 // C++11 inheriting constructors. 6035 Diag(Name.getLocStart(), 6036 getLangOpts().CPlusPlus0x ? 6037 // FIXME: Produce warn_cxx98_compat_using_decl_constructor 6038 // instead once inheriting constructors work. 6039 diag::err_using_decl_constructor_unsupported : 6040 diag::err_using_decl_constructor) 6041 << SS.getRange(); 6042 6043 if (getLangOpts().CPlusPlus0x) break; 6044 6045 return 0; 6046 6047 case UnqualifiedId::IK_DestructorName: 6048 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6049 << SS.getRange(); 6050 return 0; 6051 6052 case UnqualifiedId::IK_TemplateId: 6053 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6054 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6055 return 0; 6056 } 6057 6058 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6059 DeclarationName TargetName = TargetNameInfo.getName(); 6060 if (!TargetName) 6061 return 0; 6062 6063 // Warn about using declarations. 6064 // TODO: store that the declaration was written without 'using' and 6065 // talk about access decls instead of using decls in the 6066 // diagnostics. 6067 if (!HasUsingKeyword) { 6068 UsingLoc = Name.getLocStart(); 6069 6070 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6071 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6072 } 6073 6074 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6075 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6076 return 0; 6077 6078 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6079 TargetNameInfo, AttrList, 6080 /* IsInstantiation */ false, 6081 IsTypeName, TypenameLoc); 6082 if (UD) 6083 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6084 6085 return UD; 6086} 6087 6088/// \brief Determine whether a using declaration considers the given 6089/// declarations as "equivalent", e.g., if they are redeclarations of 6090/// the same entity or are both typedefs of the same type. 6091static bool 6092IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6093 bool &SuppressRedeclaration) { 6094 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6095 SuppressRedeclaration = false; 6096 return true; 6097 } 6098 6099 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6100 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6101 SuppressRedeclaration = true; 6102 return Context.hasSameType(TD1->getUnderlyingType(), 6103 TD2->getUnderlyingType()); 6104 } 6105 6106 return false; 6107} 6108 6109 6110/// Determines whether to create a using shadow decl for a particular 6111/// decl, given the set of decls existing prior to this using lookup. 6112bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6113 const LookupResult &Previous) { 6114 // Diagnose finding a decl which is not from a base class of the 6115 // current class. We do this now because there are cases where this 6116 // function will silently decide not to build a shadow decl, which 6117 // will pre-empt further diagnostics. 6118 // 6119 // We don't need to do this in C++0x because we do the check once on 6120 // the qualifier. 6121 // 6122 // FIXME: diagnose the following if we care enough: 6123 // struct A { int foo; }; 6124 // struct B : A { using A::foo; }; 6125 // template <class T> struct C : A {}; 6126 // template <class T> struct D : C<T> { using B::foo; } // <--- 6127 // This is invalid (during instantiation) in C++03 because B::foo 6128 // resolves to the using decl in B, which is not a base class of D<T>. 6129 // We can't diagnose it immediately because C<T> is an unknown 6130 // specialization. The UsingShadowDecl in D<T> then points directly 6131 // to A::foo, which will look well-formed when we instantiate. 6132 // The right solution is to not collapse the shadow-decl chain. 6133 if (!getLangOpts().CPlusPlus0x && CurContext->isRecord()) { 6134 DeclContext *OrigDC = Orig->getDeclContext(); 6135 6136 // Handle enums and anonymous structs. 6137 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6138 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6139 while (OrigRec->isAnonymousStructOrUnion()) 6140 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6141 6142 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6143 if (OrigDC == CurContext) { 6144 Diag(Using->getLocation(), 6145 diag::err_using_decl_nested_name_specifier_is_current_class) 6146 << Using->getQualifierLoc().getSourceRange(); 6147 Diag(Orig->getLocation(), diag::note_using_decl_target); 6148 return true; 6149 } 6150 6151 Diag(Using->getQualifierLoc().getBeginLoc(), 6152 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6153 << Using->getQualifier() 6154 << cast<CXXRecordDecl>(CurContext) 6155 << Using->getQualifierLoc().getSourceRange(); 6156 Diag(Orig->getLocation(), diag::note_using_decl_target); 6157 return true; 6158 } 6159 } 6160 6161 if (Previous.empty()) return false; 6162 6163 NamedDecl *Target = Orig; 6164 if (isa<UsingShadowDecl>(Target)) 6165 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6166 6167 // If the target happens to be one of the previous declarations, we 6168 // don't have a conflict. 6169 // 6170 // FIXME: but we might be increasing its access, in which case we 6171 // should redeclare it. 6172 NamedDecl *NonTag = 0, *Tag = 0; 6173 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6174 I != E; ++I) { 6175 NamedDecl *D = (*I)->getUnderlyingDecl(); 6176 bool Result; 6177 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6178 return Result; 6179 6180 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6181 } 6182 6183 if (Target->isFunctionOrFunctionTemplate()) { 6184 FunctionDecl *FD; 6185 if (isa<FunctionTemplateDecl>(Target)) 6186 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6187 else 6188 FD = cast<FunctionDecl>(Target); 6189 6190 NamedDecl *OldDecl = 0; 6191 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6192 case Ovl_Overload: 6193 return false; 6194 6195 case Ovl_NonFunction: 6196 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6197 break; 6198 6199 // We found a decl with the exact signature. 6200 case Ovl_Match: 6201 // If we're in a record, we want to hide the target, so we 6202 // return true (without a diagnostic) to tell the caller not to 6203 // build a shadow decl. 6204 if (CurContext->isRecord()) 6205 return true; 6206 6207 // If we're not in a record, this is an error. 6208 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6209 break; 6210 } 6211 6212 Diag(Target->getLocation(), diag::note_using_decl_target); 6213 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6214 return true; 6215 } 6216 6217 // Target is not a function. 6218 6219 if (isa<TagDecl>(Target)) { 6220 // No conflict between a tag and a non-tag. 6221 if (!Tag) return false; 6222 6223 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6224 Diag(Target->getLocation(), diag::note_using_decl_target); 6225 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6226 return true; 6227 } 6228 6229 // No conflict between a tag and a non-tag. 6230 if (!NonTag) return false; 6231 6232 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6233 Diag(Target->getLocation(), diag::note_using_decl_target); 6234 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6235 return true; 6236} 6237 6238/// Builds a shadow declaration corresponding to a 'using' declaration. 6239UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6240 UsingDecl *UD, 6241 NamedDecl *Orig) { 6242 6243 // If we resolved to another shadow declaration, just coalesce them. 6244 NamedDecl *Target = Orig; 6245 if (isa<UsingShadowDecl>(Target)) { 6246 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6247 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6248 } 6249 6250 UsingShadowDecl *Shadow 6251 = UsingShadowDecl::Create(Context, CurContext, 6252 UD->getLocation(), UD, Target); 6253 UD->addShadowDecl(Shadow); 6254 6255 Shadow->setAccess(UD->getAccess()); 6256 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6257 Shadow->setInvalidDecl(); 6258 6259 if (S) 6260 PushOnScopeChains(Shadow, S); 6261 else 6262 CurContext->addDecl(Shadow); 6263 6264 6265 return Shadow; 6266} 6267 6268/// Hides a using shadow declaration. This is required by the current 6269/// using-decl implementation when a resolvable using declaration in a 6270/// class is followed by a declaration which would hide or override 6271/// one or more of the using decl's targets; for example: 6272/// 6273/// struct Base { void foo(int); }; 6274/// struct Derived : Base { 6275/// using Base::foo; 6276/// void foo(int); 6277/// }; 6278/// 6279/// The governing language is C++03 [namespace.udecl]p12: 6280/// 6281/// When a using-declaration brings names from a base class into a 6282/// derived class scope, member functions in the derived class 6283/// override and/or hide member functions with the same name and 6284/// parameter types in a base class (rather than conflicting). 6285/// 6286/// There are two ways to implement this: 6287/// (1) optimistically create shadow decls when they're not hidden 6288/// by existing declarations, or 6289/// (2) don't create any shadow decls (or at least don't make them 6290/// visible) until we've fully parsed/instantiated the class. 6291/// The problem with (1) is that we might have to retroactively remove 6292/// a shadow decl, which requires several O(n) operations because the 6293/// decl structures are (very reasonably) not designed for removal. 6294/// (2) avoids this but is very fiddly and phase-dependent. 6295void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6296 if (Shadow->getDeclName().getNameKind() == 6297 DeclarationName::CXXConversionFunctionName) 6298 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6299 6300 // Remove it from the DeclContext... 6301 Shadow->getDeclContext()->removeDecl(Shadow); 6302 6303 // ...and the scope, if applicable... 6304 if (S) { 6305 S->RemoveDecl(Shadow); 6306 IdResolver.RemoveDecl(Shadow); 6307 } 6308 6309 // ...and the using decl. 6310 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6311 6312 // TODO: complain somehow if Shadow was used. It shouldn't 6313 // be possible for this to happen, because...? 6314} 6315 6316/// Builds a using declaration. 6317/// 6318/// \param IsInstantiation - Whether this call arises from an 6319/// instantiation of an unresolved using declaration. We treat 6320/// the lookup differently for these declarations. 6321NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6322 SourceLocation UsingLoc, 6323 CXXScopeSpec &SS, 6324 const DeclarationNameInfo &NameInfo, 6325 AttributeList *AttrList, 6326 bool IsInstantiation, 6327 bool IsTypeName, 6328 SourceLocation TypenameLoc) { 6329 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6330 SourceLocation IdentLoc = NameInfo.getLoc(); 6331 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6332 6333 // FIXME: We ignore attributes for now. 6334 6335 if (SS.isEmpty()) { 6336 Diag(IdentLoc, diag::err_using_requires_qualname); 6337 return 0; 6338 } 6339 6340 // Do the redeclaration lookup in the current scope. 6341 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6342 ForRedeclaration); 6343 Previous.setHideTags(false); 6344 if (S) { 6345 LookupName(Previous, S); 6346 6347 // It is really dumb that we have to do this. 6348 LookupResult::Filter F = Previous.makeFilter(); 6349 while (F.hasNext()) { 6350 NamedDecl *D = F.next(); 6351 if (!isDeclInScope(D, CurContext, S)) 6352 F.erase(); 6353 } 6354 F.done(); 6355 } else { 6356 assert(IsInstantiation && "no scope in non-instantiation"); 6357 assert(CurContext->isRecord() && "scope not record in instantiation"); 6358 LookupQualifiedName(Previous, CurContext); 6359 } 6360 6361 // Check for invalid redeclarations. 6362 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6363 return 0; 6364 6365 // Check for bad qualifiers. 6366 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6367 return 0; 6368 6369 DeclContext *LookupContext = computeDeclContext(SS); 6370 NamedDecl *D; 6371 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6372 if (!LookupContext) { 6373 if (IsTypeName) { 6374 // FIXME: not all declaration name kinds are legal here 6375 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6376 UsingLoc, TypenameLoc, 6377 QualifierLoc, 6378 IdentLoc, NameInfo.getName()); 6379 } else { 6380 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6381 QualifierLoc, NameInfo); 6382 } 6383 } else { 6384 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6385 NameInfo, IsTypeName); 6386 } 6387 D->setAccess(AS); 6388 CurContext->addDecl(D); 6389 6390 if (!LookupContext) return D; 6391 UsingDecl *UD = cast<UsingDecl>(D); 6392 6393 if (RequireCompleteDeclContext(SS, LookupContext)) { 6394 UD->setInvalidDecl(); 6395 return UD; 6396 } 6397 6398 // The normal rules do not apply to inheriting constructor declarations. 6399 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6400 if (CheckInheritingConstructorUsingDecl(UD)) 6401 UD->setInvalidDecl(); 6402 return UD; 6403 } 6404 6405 // Otherwise, look up the target name. 6406 6407 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6408 6409 // Unlike most lookups, we don't always want to hide tag 6410 // declarations: tag names are visible through the using declaration 6411 // even if hidden by ordinary names, *except* in a dependent context 6412 // where it's important for the sanity of two-phase lookup. 6413 if (!IsInstantiation) 6414 R.setHideTags(false); 6415 6416 // For the purposes of this lookup, we have a base object type 6417 // equal to that of the current context. 6418 if (CurContext->isRecord()) { 6419 R.setBaseObjectType( 6420 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6421 } 6422 6423 LookupQualifiedName(R, LookupContext); 6424 6425 if (R.empty()) { 6426 Diag(IdentLoc, diag::err_no_member) 6427 << NameInfo.getName() << LookupContext << SS.getRange(); 6428 UD->setInvalidDecl(); 6429 return UD; 6430 } 6431 6432 if (R.isAmbiguous()) { 6433 UD->setInvalidDecl(); 6434 return UD; 6435 } 6436 6437 if (IsTypeName) { 6438 // If we asked for a typename and got a non-type decl, error out. 6439 if (!R.getAsSingle<TypeDecl>()) { 6440 Diag(IdentLoc, diag::err_using_typename_non_type); 6441 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6442 Diag((*I)->getUnderlyingDecl()->getLocation(), 6443 diag::note_using_decl_target); 6444 UD->setInvalidDecl(); 6445 return UD; 6446 } 6447 } else { 6448 // If we asked for a non-typename and we got a type, error out, 6449 // but only if this is an instantiation of an unresolved using 6450 // decl. Otherwise just silently find the type name. 6451 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6452 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6453 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6454 UD->setInvalidDecl(); 6455 return UD; 6456 } 6457 } 6458 6459 // C++0x N2914 [namespace.udecl]p6: 6460 // A using-declaration shall not name a namespace. 6461 if (R.getAsSingle<NamespaceDecl>()) { 6462 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6463 << SS.getRange(); 6464 UD->setInvalidDecl(); 6465 return UD; 6466 } 6467 6468 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6469 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6470 BuildUsingShadowDecl(S, UD, *I); 6471 } 6472 6473 return UD; 6474} 6475 6476/// Additional checks for a using declaration referring to a constructor name. 6477bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6478 assert(!UD->isTypeName() && "expecting a constructor name"); 6479 6480 const Type *SourceType = UD->getQualifier()->getAsType(); 6481 assert(SourceType && 6482 "Using decl naming constructor doesn't have type in scope spec."); 6483 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6484 6485 // Check whether the named type is a direct base class. 6486 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6487 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6488 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6489 BaseIt != BaseE; ++BaseIt) { 6490 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 6491 if (CanonicalSourceType == BaseType) 6492 break; 6493 if (BaseIt->getType()->isDependentType()) 6494 break; 6495 } 6496 6497 if (BaseIt == BaseE) { 6498 // Did not find SourceType in the bases. 6499 Diag(UD->getUsingLocation(), 6500 diag::err_using_decl_constructor_not_in_direct_base) 6501 << UD->getNameInfo().getSourceRange() 6502 << QualType(SourceType, 0) << TargetClass; 6503 return true; 6504 } 6505 6506 if (!CurContext->isDependentContext()) 6507 BaseIt->setInheritConstructors(); 6508 6509 return false; 6510} 6511 6512/// Checks that the given using declaration is not an invalid 6513/// redeclaration. Note that this is checking only for the using decl 6514/// itself, not for any ill-formedness among the UsingShadowDecls. 6515bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 6516 bool isTypeName, 6517 const CXXScopeSpec &SS, 6518 SourceLocation NameLoc, 6519 const LookupResult &Prev) { 6520 // C++03 [namespace.udecl]p8: 6521 // C++0x [namespace.udecl]p10: 6522 // A using-declaration is a declaration and can therefore be used 6523 // repeatedly where (and only where) multiple declarations are 6524 // allowed. 6525 // 6526 // That's in non-member contexts. 6527 if (!CurContext->getRedeclContext()->isRecord()) 6528 return false; 6529 6530 NestedNameSpecifier *Qual 6531 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 6532 6533 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 6534 NamedDecl *D = *I; 6535 6536 bool DTypename; 6537 NestedNameSpecifier *DQual; 6538 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 6539 DTypename = UD->isTypeName(); 6540 DQual = UD->getQualifier(); 6541 } else if (UnresolvedUsingValueDecl *UD 6542 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 6543 DTypename = false; 6544 DQual = UD->getQualifier(); 6545 } else if (UnresolvedUsingTypenameDecl *UD 6546 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 6547 DTypename = true; 6548 DQual = UD->getQualifier(); 6549 } else continue; 6550 6551 // using decls differ if one says 'typename' and the other doesn't. 6552 // FIXME: non-dependent using decls? 6553 if (isTypeName != DTypename) continue; 6554 6555 // using decls differ if they name different scopes (but note that 6556 // template instantiation can cause this check to trigger when it 6557 // didn't before instantiation). 6558 if (Context.getCanonicalNestedNameSpecifier(Qual) != 6559 Context.getCanonicalNestedNameSpecifier(DQual)) 6560 continue; 6561 6562 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 6563 Diag(D->getLocation(), diag::note_using_decl) << 1; 6564 return true; 6565 } 6566 6567 return false; 6568} 6569 6570 6571/// Checks that the given nested-name qualifier used in a using decl 6572/// in the current context is appropriately related to the current 6573/// scope. If an error is found, diagnoses it and returns true. 6574bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 6575 const CXXScopeSpec &SS, 6576 SourceLocation NameLoc) { 6577 DeclContext *NamedContext = computeDeclContext(SS); 6578 6579 if (!CurContext->isRecord()) { 6580 // C++03 [namespace.udecl]p3: 6581 // C++0x [namespace.udecl]p8: 6582 // A using-declaration for a class member shall be a member-declaration. 6583 6584 // If we weren't able to compute a valid scope, it must be a 6585 // dependent class scope. 6586 if (!NamedContext || NamedContext->isRecord()) { 6587 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 6588 << SS.getRange(); 6589 return true; 6590 } 6591 6592 // Otherwise, everything is known to be fine. 6593 return false; 6594 } 6595 6596 // The current scope is a record. 6597 6598 // If the named context is dependent, we can't decide much. 6599 if (!NamedContext) { 6600 // FIXME: in C++0x, we can diagnose if we can prove that the 6601 // nested-name-specifier does not refer to a base class, which is 6602 // still possible in some cases. 6603 6604 // Otherwise we have to conservatively report that things might be 6605 // okay. 6606 return false; 6607 } 6608 6609 if (!NamedContext->isRecord()) { 6610 // Ideally this would point at the last name in the specifier, 6611 // but we don't have that level of source info. 6612 Diag(SS.getRange().getBegin(), 6613 diag::err_using_decl_nested_name_specifier_is_not_class) 6614 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 6615 return true; 6616 } 6617 6618 if (!NamedContext->isDependentContext() && 6619 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 6620 return true; 6621 6622 if (getLangOpts().CPlusPlus0x) { 6623 // C++0x [namespace.udecl]p3: 6624 // In a using-declaration used as a member-declaration, the 6625 // nested-name-specifier shall name a base class of the class 6626 // being defined. 6627 6628 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 6629 cast<CXXRecordDecl>(NamedContext))) { 6630 if (CurContext == NamedContext) { 6631 Diag(NameLoc, 6632 diag::err_using_decl_nested_name_specifier_is_current_class) 6633 << SS.getRange(); 6634 return true; 6635 } 6636 6637 Diag(SS.getRange().getBegin(), 6638 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6639 << (NestedNameSpecifier*) SS.getScopeRep() 6640 << cast<CXXRecordDecl>(CurContext) 6641 << SS.getRange(); 6642 return true; 6643 } 6644 6645 return false; 6646 } 6647 6648 // C++03 [namespace.udecl]p4: 6649 // A using-declaration used as a member-declaration shall refer 6650 // to a member of a base class of the class being defined [etc.]. 6651 6652 // Salient point: SS doesn't have to name a base class as long as 6653 // lookup only finds members from base classes. Therefore we can 6654 // diagnose here only if we can prove that that can't happen, 6655 // i.e. if the class hierarchies provably don't intersect. 6656 6657 // TODO: it would be nice if "definitely valid" results were cached 6658 // in the UsingDecl and UsingShadowDecl so that these checks didn't 6659 // need to be repeated. 6660 6661 struct UserData { 6662 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 6663 6664 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 6665 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6666 Data->Bases.insert(Base); 6667 return true; 6668 } 6669 6670 bool hasDependentBases(const CXXRecordDecl *Class) { 6671 return !Class->forallBases(collect, this); 6672 } 6673 6674 /// Returns true if the base is dependent or is one of the 6675 /// accumulated base classes. 6676 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 6677 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 6678 return !Data->Bases.count(Base); 6679 } 6680 6681 bool mightShareBases(const CXXRecordDecl *Class) { 6682 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 6683 } 6684 }; 6685 6686 UserData Data; 6687 6688 // Returns false if we find a dependent base. 6689 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 6690 return false; 6691 6692 // Returns false if the class has a dependent base or if it or one 6693 // of its bases is present in the base set of the current context. 6694 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 6695 return false; 6696 6697 Diag(SS.getRange().getBegin(), 6698 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6699 << (NestedNameSpecifier*) SS.getScopeRep() 6700 << cast<CXXRecordDecl>(CurContext) 6701 << SS.getRange(); 6702 6703 return true; 6704} 6705 6706Decl *Sema::ActOnAliasDeclaration(Scope *S, 6707 AccessSpecifier AS, 6708 MultiTemplateParamsArg TemplateParamLists, 6709 SourceLocation UsingLoc, 6710 UnqualifiedId &Name, 6711 TypeResult Type) { 6712 // Skip up to the relevant declaration scope. 6713 while (S->getFlags() & Scope::TemplateParamScope) 6714 S = S->getParent(); 6715 assert((S->getFlags() & Scope::DeclScope) && 6716 "got alias-declaration outside of declaration scope"); 6717 6718 if (Type.isInvalid()) 6719 return 0; 6720 6721 bool Invalid = false; 6722 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 6723 TypeSourceInfo *TInfo = 0; 6724 GetTypeFromParser(Type.get(), &TInfo); 6725 6726 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 6727 return 0; 6728 6729 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 6730 UPPC_DeclarationType)) { 6731 Invalid = true; 6732 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 6733 TInfo->getTypeLoc().getBeginLoc()); 6734 } 6735 6736 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 6737 LookupName(Previous, S); 6738 6739 // Warn about shadowing the name of a template parameter. 6740 if (Previous.isSingleResult() && 6741 Previous.getFoundDecl()->isTemplateParameter()) { 6742 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 6743 Previous.clear(); 6744 } 6745 6746 assert(Name.Kind == UnqualifiedId::IK_Identifier && 6747 "name in alias declaration must be an identifier"); 6748 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 6749 Name.StartLocation, 6750 Name.Identifier, TInfo); 6751 6752 NewTD->setAccess(AS); 6753 6754 if (Invalid) 6755 NewTD->setInvalidDecl(); 6756 6757 CheckTypedefForVariablyModifiedType(S, NewTD); 6758 Invalid |= NewTD->isInvalidDecl(); 6759 6760 bool Redeclaration = false; 6761 6762 NamedDecl *NewND; 6763 if (TemplateParamLists.size()) { 6764 TypeAliasTemplateDecl *OldDecl = 0; 6765 TemplateParameterList *OldTemplateParams = 0; 6766 6767 if (TemplateParamLists.size() != 1) { 6768 Diag(UsingLoc, diag::err_alias_template_extra_headers) 6769 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 6770 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 6771 } 6772 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 6773 6774 // Only consider previous declarations in the same scope. 6775 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 6776 /*ExplicitInstantiationOrSpecialization*/false); 6777 if (!Previous.empty()) { 6778 Redeclaration = true; 6779 6780 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 6781 if (!OldDecl && !Invalid) { 6782 Diag(UsingLoc, diag::err_redefinition_different_kind) 6783 << Name.Identifier; 6784 6785 NamedDecl *OldD = Previous.getRepresentativeDecl(); 6786 if (OldD->getLocation().isValid()) 6787 Diag(OldD->getLocation(), diag::note_previous_definition); 6788 6789 Invalid = true; 6790 } 6791 6792 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 6793 if (TemplateParameterListsAreEqual(TemplateParams, 6794 OldDecl->getTemplateParameters(), 6795 /*Complain=*/true, 6796 TPL_TemplateMatch)) 6797 OldTemplateParams = OldDecl->getTemplateParameters(); 6798 else 6799 Invalid = true; 6800 6801 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 6802 if (!Invalid && 6803 !Context.hasSameType(OldTD->getUnderlyingType(), 6804 NewTD->getUnderlyingType())) { 6805 // FIXME: The C++0x standard does not clearly say this is ill-formed, 6806 // but we can't reasonably accept it. 6807 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 6808 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 6809 if (OldTD->getLocation().isValid()) 6810 Diag(OldTD->getLocation(), diag::note_previous_definition); 6811 Invalid = true; 6812 } 6813 } 6814 } 6815 6816 // Merge any previous default template arguments into our parameters, 6817 // and check the parameter list. 6818 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 6819 TPC_TypeAliasTemplate)) 6820 return 0; 6821 6822 TypeAliasTemplateDecl *NewDecl = 6823 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 6824 Name.Identifier, TemplateParams, 6825 NewTD); 6826 6827 NewDecl->setAccess(AS); 6828 6829 if (Invalid) 6830 NewDecl->setInvalidDecl(); 6831 else if (OldDecl) 6832 NewDecl->setPreviousDeclaration(OldDecl); 6833 6834 NewND = NewDecl; 6835 } else { 6836 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 6837 NewND = NewTD; 6838 } 6839 6840 if (!Redeclaration) 6841 PushOnScopeChains(NewND, S); 6842 6843 ActOnDocumentableDecl(NewND); 6844 return NewND; 6845} 6846 6847Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 6848 SourceLocation NamespaceLoc, 6849 SourceLocation AliasLoc, 6850 IdentifierInfo *Alias, 6851 CXXScopeSpec &SS, 6852 SourceLocation IdentLoc, 6853 IdentifierInfo *Ident) { 6854 6855 // Lookup the namespace name. 6856 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 6857 LookupParsedName(R, S, &SS); 6858 6859 // Check if we have a previous declaration with the same name. 6860 NamedDecl *PrevDecl 6861 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 6862 ForRedeclaration); 6863 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 6864 PrevDecl = 0; 6865 6866 if (PrevDecl) { 6867 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 6868 // We already have an alias with the same name that points to the same 6869 // namespace, so don't create a new one. 6870 // FIXME: At some point, we'll want to create the (redundant) 6871 // declaration to maintain better source information. 6872 if (!R.isAmbiguous() && !R.empty() && 6873 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 6874 return 0; 6875 } 6876 6877 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 6878 diag::err_redefinition_different_kind; 6879 Diag(AliasLoc, DiagID) << Alias; 6880 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6881 return 0; 6882 } 6883 6884 if (R.isAmbiguous()) 6885 return 0; 6886 6887 if (R.empty()) { 6888 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 6889 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6890 return 0; 6891 } 6892 } 6893 6894 NamespaceAliasDecl *AliasDecl = 6895 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 6896 Alias, SS.getWithLocInContext(Context), 6897 IdentLoc, R.getFoundDecl()); 6898 6899 PushOnScopeChains(AliasDecl, S); 6900 return AliasDecl; 6901} 6902 6903Sema::ImplicitExceptionSpecification 6904Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 6905 CXXMethodDecl *MD) { 6906 CXXRecordDecl *ClassDecl = MD->getParent(); 6907 6908 // C++ [except.spec]p14: 6909 // An implicitly declared special member function (Clause 12) shall have an 6910 // exception-specification. [...] 6911 ImplicitExceptionSpecification ExceptSpec(*this); 6912 if (ClassDecl->isInvalidDecl()) 6913 return ExceptSpec; 6914 6915 // Direct base-class constructors. 6916 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 6917 BEnd = ClassDecl->bases_end(); 6918 B != BEnd; ++B) { 6919 if (B->isVirtual()) // Handled below. 6920 continue; 6921 6922 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6923 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6924 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6925 // If this is a deleted function, add it anyway. This might be conformant 6926 // with the standard. This might not. I'm not sure. It might not matter. 6927 if (Constructor) 6928 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6929 } 6930 } 6931 6932 // Virtual base-class constructors. 6933 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 6934 BEnd = ClassDecl->vbases_end(); 6935 B != BEnd; ++B) { 6936 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 6937 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 6938 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 6939 // If this is a deleted function, add it anyway. This might be conformant 6940 // with the standard. This might not. I'm not sure. It might not matter. 6941 if (Constructor) 6942 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 6943 } 6944 } 6945 6946 // Field constructors. 6947 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 6948 FEnd = ClassDecl->field_end(); 6949 F != FEnd; ++F) { 6950 if (F->hasInClassInitializer()) { 6951 if (Expr *E = F->getInClassInitializer()) 6952 ExceptSpec.CalledExpr(E); 6953 else if (!F->isInvalidDecl()) 6954 // DR1351: 6955 // If the brace-or-equal-initializer of a non-static data member 6956 // invokes a defaulted default constructor of its class or of an 6957 // enclosing class in a potentially evaluated subexpression, the 6958 // program is ill-formed. 6959 // 6960 // This resolution is unworkable: the exception specification of the 6961 // default constructor can be needed in an unevaluated context, in 6962 // particular, in the operand of a noexcept-expression, and we can be 6963 // unable to compute an exception specification for an enclosed class. 6964 // 6965 // We do not allow an in-class initializer to require the evaluation 6966 // of the exception specification for any in-class initializer whose 6967 // definition is not lexically complete. 6968 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 6969 } else if (const RecordType *RecordTy 6970 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 6971 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 6972 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 6973 // If this is a deleted function, add it anyway. This might be conformant 6974 // with the standard. This might not. I'm not sure. It might not matter. 6975 // In particular, the problem is that this function never gets called. It 6976 // might just be ill-formed because this function attempts to refer to 6977 // a deleted function here. 6978 if (Constructor) 6979 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 6980 } 6981 } 6982 6983 return ExceptSpec; 6984} 6985 6986CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 6987 CXXRecordDecl *ClassDecl) { 6988 // C++ [class.ctor]p5: 6989 // A default constructor for a class X is a constructor of class X 6990 // that can be called without an argument. If there is no 6991 // user-declared constructor for class X, a default constructor is 6992 // implicitly declared. An implicitly-declared default constructor 6993 // is an inline public member of its class. 6994 assert(!ClassDecl->hasUserDeclaredConstructor() && 6995 "Should not build implicit default constructor!"); 6996 6997 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 6998 CXXDefaultConstructor, 6999 false); 7000 7001 // Create the actual constructor declaration. 7002 CanQualType ClassType 7003 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7004 SourceLocation ClassLoc = ClassDecl->getLocation(); 7005 DeclarationName Name 7006 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7007 DeclarationNameInfo NameInfo(Name, ClassLoc); 7008 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7009 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7010 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7011 Constexpr); 7012 DefaultCon->setAccess(AS_public); 7013 DefaultCon->setDefaulted(); 7014 DefaultCon->setImplicit(); 7015 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7016 7017 // Build an exception specification pointing back at this constructor. 7018 FunctionProtoType::ExtProtoInfo EPI; 7019 EPI.ExceptionSpecType = EST_Unevaluated; 7020 EPI.ExceptionSpecDecl = DefaultCon; 7021 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7022 7023 // Note that we have declared this constructor. 7024 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7025 7026 if (Scope *S = getScopeForContext(ClassDecl)) 7027 PushOnScopeChains(DefaultCon, S, false); 7028 ClassDecl->addDecl(DefaultCon); 7029 7030 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7031 DefaultCon->setDeletedAsWritten(); 7032 7033 return DefaultCon; 7034} 7035 7036void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7037 CXXConstructorDecl *Constructor) { 7038 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7039 !Constructor->doesThisDeclarationHaveABody() && 7040 !Constructor->isDeleted()) && 7041 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7042 7043 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7044 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7045 7046 SynthesizedFunctionScope Scope(*this, Constructor); 7047 DiagnosticErrorTrap Trap(Diags); 7048 if (SetCtorInitializers(Constructor, 0, 0, /*AnyErrors=*/false) || 7049 Trap.hasErrorOccurred()) { 7050 Diag(CurrentLocation, diag::note_member_synthesized_at) 7051 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7052 Constructor->setInvalidDecl(); 7053 return; 7054 } 7055 7056 SourceLocation Loc = Constructor->getLocation(); 7057 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7058 7059 Constructor->setUsed(); 7060 MarkVTableUsed(CurrentLocation, ClassDecl); 7061 7062 if (ASTMutationListener *L = getASTMutationListener()) { 7063 L->CompletedImplicitDefinition(Constructor); 7064 } 7065} 7066 7067void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7068 if (!D) return; 7069 AdjustDeclIfTemplate(D); 7070 7071 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(D); 7072 7073 if (!ClassDecl->isDependentType()) 7074 CheckExplicitlyDefaultedMethods(ClassDecl); 7075} 7076 7077void Sema::DeclareInheritedConstructors(CXXRecordDecl *ClassDecl) { 7078 // We start with an initial pass over the base classes to collect those that 7079 // inherit constructors from. If there are none, we can forgo all further 7080 // processing. 7081 typedef SmallVector<const RecordType *, 4> BasesVector; 7082 BasesVector BasesToInheritFrom; 7083 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7084 BaseE = ClassDecl->bases_end(); 7085 BaseIt != BaseE; ++BaseIt) { 7086 if (BaseIt->getInheritConstructors()) { 7087 QualType Base = BaseIt->getType(); 7088 if (Base->isDependentType()) { 7089 // If we inherit constructors from anything that is dependent, just 7090 // abort processing altogether. We'll get another chance for the 7091 // instantiations. 7092 return; 7093 } 7094 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7095 } 7096 } 7097 if (BasesToInheritFrom.empty()) 7098 return; 7099 7100 // Now collect the constructors that we already have in the current class. 7101 // Those take precedence over inherited constructors. 7102 // C++0x [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7103 // unless there is a user-declared constructor with the same signature in 7104 // the class where the using-declaration appears. 7105 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7106 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7107 CtorE = ClassDecl->ctor_end(); 7108 CtorIt != CtorE; ++CtorIt) { 7109 ExistingConstructors.insert( 7110 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7111 } 7112 7113 DeclarationName CreatedCtorName = 7114 Context.DeclarationNames.getCXXConstructorName( 7115 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7116 7117 // Now comes the true work. 7118 // First, we keep a map from constructor types to the base that introduced 7119 // them. Needed for finding conflicting constructors. We also keep the 7120 // actually inserted declarations in there, for pretty diagnostics. 7121 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7122 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7123 ConstructorToSourceMap InheritedConstructors; 7124 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7125 BaseE = BasesToInheritFrom.end(); 7126 BaseIt != BaseE; ++BaseIt) { 7127 const RecordType *Base = *BaseIt; 7128 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7129 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7130 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7131 CtorE = BaseDecl->ctor_end(); 7132 CtorIt != CtorE; ++CtorIt) { 7133 // Find the using declaration for inheriting this base's constructors. 7134 // FIXME: Don't perform name lookup just to obtain a source location! 7135 DeclarationName Name = 7136 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7137 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7138 LookupQualifiedName(Result, CurContext); 7139 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7140 SourceLocation UsingLoc = UD ? UD->getLocation() : 7141 ClassDecl->getLocation(); 7142 7143 // C++0x [class.inhctor]p1: The candidate set of inherited constructors 7144 // from the class X named in the using-declaration consists of actual 7145 // constructors and notional constructors that result from the 7146 // transformation of defaulted parameters as follows: 7147 // - all non-template default constructors of X, and 7148 // - for each non-template constructor of X that has at least one 7149 // parameter with a default argument, the set of constructors that 7150 // results from omitting any ellipsis parameter specification and 7151 // successively omitting parameters with a default argument from the 7152 // end of the parameter-type-list. 7153 CXXConstructorDecl *BaseCtor = *CtorIt; 7154 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7155 const FunctionProtoType *BaseCtorType = 7156 BaseCtor->getType()->getAs<FunctionProtoType>(); 7157 7158 for (unsigned params = BaseCtor->getMinRequiredArguments(), 7159 maxParams = BaseCtor->getNumParams(); 7160 params <= maxParams; ++params) { 7161 // Skip default constructors. They're never inherited. 7162 if (params == 0) 7163 continue; 7164 // Skip copy and move constructors for the same reason. 7165 if (CanBeCopyOrMove && params == 1) 7166 continue; 7167 7168 // Build up a function type for this particular constructor. 7169 // FIXME: The working paper does not consider that the exception spec 7170 // for the inheriting constructor might be larger than that of the 7171 // source. This code doesn't yet, either. When it does, this code will 7172 // need to be delayed until after exception specifications and in-class 7173 // member initializers are attached. 7174 const Type *NewCtorType; 7175 if (params == maxParams) 7176 NewCtorType = BaseCtorType; 7177 else { 7178 SmallVector<QualType, 16> Args; 7179 for (unsigned i = 0; i < params; ++i) { 7180 Args.push_back(BaseCtorType->getArgType(i)); 7181 } 7182 FunctionProtoType::ExtProtoInfo ExtInfo = 7183 BaseCtorType->getExtProtoInfo(); 7184 ExtInfo.Variadic = false; 7185 NewCtorType = Context.getFunctionType(BaseCtorType->getResultType(), 7186 Args.data(), params, ExtInfo) 7187 .getTypePtr(); 7188 } 7189 const Type *CanonicalNewCtorType = 7190 Context.getCanonicalType(NewCtorType); 7191 7192 // Now that we have the type, first check if the class already has a 7193 // constructor with this signature. 7194 if (ExistingConstructors.count(CanonicalNewCtorType)) 7195 continue; 7196 7197 // Then we check if we have already declared an inherited constructor 7198 // with this signature. 7199 std::pair<ConstructorToSourceMap::iterator, bool> result = 7200 InheritedConstructors.insert(std::make_pair( 7201 CanonicalNewCtorType, 7202 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7203 if (!result.second) { 7204 // Already in the map. If it came from a different class, that's an 7205 // error. Not if it's from the same. 7206 CanQualType PreviousBase = result.first->second.first; 7207 if (CanonicalBase != PreviousBase) { 7208 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7209 const CXXConstructorDecl *PrevBaseCtor = 7210 PrevCtor->getInheritedConstructor(); 7211 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7212 7213 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7214 Diag(BaseCtor->getLocation(), 7215 diag::note_using_decl_constructor_conflict_current_ctor); 7216 Diag(PrevBaseCtor->getLocation(), 7217 diag::note_using_decl_constructor_conflict_previous_ctor); 7218 Diag(PrevCtor->getLocation(), 7219 diag::note_using_decl_constructor_conflict_previous_using); 7220 } 7221 continue; 7222 } 7223 7224 // OK, we're there, now add the constructor. 7225 // C++0x [class.inhctor]p8: [...] that would be performed by a 7226 // user-written inline constructor [...] 7227 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7228 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7229 Context, ClassDecl, UsingLoc, DNI, QualType(NewCtorType, 0), 7230 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7231 /*ImplicitlyDeclared=*/true, 7232 // FIXME: Due to a defect in the standard, we treat inherited 7233 // constructors as constexpr even if that makes them ill-formed. 7234 /*Constexpr=*/BaseCtor->isConstexpr()); 7235 NewCtor->setAccess(BaseCtor->getAccess()); 7236 7237 // Build up the parameter decls and add them. 7238 SmallVector<ParmVarDecl *, 16> ParamDecls; 7239 for (unsigned i = 0; i < params; ++i) { 7240 ParamDecls.push_back(ParmVarDecl::Create(Context, NewCtor, 7241 UsingLoc, UsingLoc, 7242 /*IdentifierInfo=*/0, 7243 BaseCtorType->getArgType(i), 7244 /*TInfo=*/0, SC_None, 7245 SC_None, /*DefaultArg=*/0)); 7246 } 7247 NewCtor->setParams(ParamDecls); 7248 NewCtor->setInheritedConstructor(BaseCtor); 7249 7250 ClassDecl->addDecl(NewCtor); 7251 result.first->second.second = NewCtor; 7252 } 7253 } 7254 } 7255} 7256 7257Sema::ImplicitExceptionSpecification 7258Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7259 CXXRecordDecl *ClassDecl = MD->getParent(); 7260 7261 // C++ [except.spec]p14: 7262 // An implicitly declared special member function (Clause 12) shall have 7263 // an exception-specification. 7264 ImplicitExceptionSpecification ExceptSpec(*this); 7265 if (ClassDecl->isInvalidDecl()) 7266 return ExceptSpec; 7267 7268 // Direct base-class destructors. 7269 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7270 BEnd = ClassDecl->bases_end(); 7271 B != BEnd; ++B) { 7272 if (B->isVirtual()) // Handled below. 7273 continue; 7274 7275 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7276 ExceptSpec.CalledDecl(B->getLocStart(), 7277 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7278 } 7279 7280 // Virtual base-class destructors. 7281 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7282 BEnd = ClassDecl->vbases_end(); 7283 B != BEnd; ++B) { 7284 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7285 ExceptSpec.CalledDecl(B->getLocStart(), 7286 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7287 } 7288 7289 // Field destructors. 7290 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7291 FEnd = ClassDecl->field_end(); 7292 F != FEnd; ++F) { 7293 if (const RecordType *RecordTy 7294 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7295 ExceptSpec.CalledDecl(F->getLocation(), 7296 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7297 } 7298 7299 return ExceptSpec; 7300} 7301 7302CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7303 // C++ [class.dtor]p2: 7304 // If a class has no user-declared destructor, a destructor is 7305 // declared implicitly. An implicitly-declared destructor is an 7306 // inline public member of its class. 7307 7308 // Create the actual destructor declaration. 7309 CanQualType ClassType 7310 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7311 SourceLocation ClassLoc = ClassDecl->getLocation(); 7312 DeclarationName Name 7313 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7314 DeclarationNameInfo NameInfo(Name, ClassLoc); 7315 CXXDestructorDecl *Destructor 7316 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7317 QualType(), 0, /*isInline=*/true, 7318 /*isImplicitlyDeclared=*/true); 7319 Destructor->setAccess(AS_public); 7320 Destructor->setDefaulted(); 7321 Destructor->setImplicit(); 7322 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7323 7324 // Build an exception specification pointing back at this destructor. 7325 FunctionProtoType::ExtProtoInfo EPI; 7326 EPI.ExceptionSpecType = EST_Unevaluated; 7327 EPI.ExceptionSpecDecl = Destructor; 7328 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7329 7330 // Note that we have declared this destructor. 7331 ++ASTContext::NumImplicitDestructorsDeclared; 7332 7333 // Introduce this destructor into its scope. 7334 if (Scope *S = getScopeForContext(ClassDecl)) 7335 PushOnScopeChains(Destructor, S, false); 7336 ClassDecl->addDecl(Destructor); 7337 7338 AddOverriddenMethods(ClassDecl, Destructor); 7339 7340 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7341 Destructor->setDeletedAsWritten(); 7342 7343 return Destructor; 7344} 7345 7346void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7347 CXXDestructorDecl *Destructor) { 7348 assert((Destructor->isDefaulted() && 7349 !Destructor->doesThisDeclarationHaveABody() && 7350 !Destructor->isDeleted()) && 7351 "DefineImplicitDestructor - call it for implicit default dtor"); 7352 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7353 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7354 7355 if (Destructor->isInvalidDecl()) 7356 return; 7357 7358 SynthesizedFunctionScope Scope(*this, Destructor); 7359 7360 DiagnosticErrorTrap Trap(Diags); 7361 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7362 Destructor->getParent()); 7363 7364 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7365 Diag(CurrentLocation, diag::note_member_synthesized_at) 7366 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7367 7368 Destructor->setInvalidDecl(); 7369 return; 7370 } 7371 7372 SourceLocation Loc = Destructor->getLocation(); 7373 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7374 Destructor->setImplicitlyDefined(true); 7375 Destructor->setUsed(); 7376 MarkVTableUsed(CurrentLocation, ClassDecl); 7377 7378 if (ASTMutationListener *L = getASTMutationListener()) { 7379 L->CompletedImplicitDefinition(Destructor); 7380 } 7381} 7382 7383/// \brief Perform any semantic analysis which needs to be delayed until all 7384/// pending class member declarations have been parsed. 7385void Sema::ActOnFinishCXXMemberDecls() { 7386 // Perform any deferred checking of exception specifications for virtual 7387 // destructors. 7388 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 7389 i != e; ++i) { 7390 const CXXDestructorDecl *Dtor = 7391 DelayedDestructorExceptionSpecChecks[i].first; 7392 assert(!Dtor->getParent()->isDependentType() && 7393 "Should not ever add destructors of templates into the list."); 7394 CheckOverridingFunctionExceptionSpec(Dtor, 7395 DelayedDestructorExceptionSpecChecks[i].second); 7396 } 7397 DelayedDestructorExceptionSpecChecks.clear(); 7398} 7399 7400void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 7401 CXXDestructorDecl *Destructor) { 7402 assert(getLangOpts().CPlusPlus0x && 7403 "adjusting dtor exception specs was introduced in c++11"); 7404 7405 // C++11 [class.dtor]p3: 7406 // A declaration of a destructor that does not have an exception- 7407 // specification is implicitly considered to have the same exception- 7408 // specification as an implicit declaration. 7409 const FunctionProtoType *DtorType = Destructor->getType()-> 7410 getAs<FunctionProtoType>(); 7411 if (DtorType->hasExceptionSpec()) 7412 return; 7413 7414 // Replace the destructor's type, building off the existing one. Fortunately, 7415 // the only thing of interest in the destructor type is its extended info. 7416 // The return and arguments are fixed. 7417 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 7418 EPI.ExceptionSpecType = EST_Unevaluated; 7419 EPI.ExceptionSpecDecl = Destructor; 7420 Destructor->setType(Context.getFunctionType(Context.VoidTy, 0, 0, EPI)); 7421 7422 // FIXME: If the destructor has a body that could throw, and the newly created 7423 // spec doesn't allow exceptions, we should emit a warning, because this 7424 // change in behavior can break conforming C++03 programs at runtime. 7425 // However, we don't have a body or an exception specification yet, so it 7426 // needs to be done somewhere else. 7427} 7428 7429/// When generating a defaulted copy or move assignment operator, if a field 7430/// should be copied with __builtin_memcpy rather than via explicit assignments, 7431/// do so. This optimization only applies for arrays of scalars, and for arrays 7432/// of class type where the selected copy/move-assignment operator is trivial. 7433static StmtResult 7434buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 7435 Expr *To, Expr *From) { 7436 // Compute the size of the memory buffer to be copied. 7437 QualType SizeType = S.Context.getSizeType(); 7438 llvm::APInt Size(S.Context.getTypeSize(SizeType), 7439 S.Context.getTypeSizeInChars(T).getQuantity()); 7440 7441 // Take the address of the field references for "from" and "to". We 7442 // directly construct UnaryOperators here because semantic analysis 7443 // does not permit us to take the address of an xvalue. 7444 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 7445 S.Context.getPointerType(From->getType()), 7446 VK_RValue, OK_Ordinary, Loc); 7447 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 7448 S.Context.getPointerType(To->getType()), 7449 VK_RValue, OK_Ordinary, Loc); 7450 7451 const Type *E = T->getBaseElementTypeUnsafe(); 7452 bool NeedsCollectableMemCpy = 7453 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 7454 7455 // Create a reference to the __builtin_objc_memmove_collectable function 7456 StringRef MemCpyName = NeedsCollectableMemCpy ? 7457 "__builtin_objc_memmove_collectable" : 7458 "__builtin_memcpy"; 7459 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 7460 Sema::LookupOrdinaryName); 7461 S.LookupName(R, S.TUScope, true); 7462 7463 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 7464 if (!MemCpy) 7465 // Something went horribly wrong earlier, and we will have complained 7466 // about it. 7467 return StmtError(); 7468 7469 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 7470 VK_RValue, Loc, 0); 7471 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 7472 7473 Expr *CallArgs[] = { 7474 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 7475 }; 7476 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 7477 Loc, CallArgs, Loc); 7478 7479 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 7480 return S.Owned(Call.takeAs<Stmt>()); 7481} 7482 7483/// \brief Builds a statement that copies/moves the given entity from \p From to 7484/// \c To. 7485/// 7486/// This routine is used to copy/move the members of a class with an 7487/// implicitly-declared copy/move assignment operator. When the entities being 7488/// copied are arrays, this routine builds for loops to copy them. 7489/// 7490/// \param S The Sema object used for type-checking. 7491/// 7492/// \param Loc The location where the implicit copy/move is being generated. 7493/// 7494/// \param T The type of the expressions being copied/moved. Both expressions 7495/// must have this type. 7496/// 7497/// \param To The expression we are copying/moving to. 7498/// 7499/// \param From The expression we are copying/moving from. 7500/// 7501/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 7502/// Otherwise, it's a non-static member subobject. 7503/// 7504/// \param Copying Whether we're copying or moving. 7505/// 7506/// \param Depth Internal parameter recording the depth of the recursion. 7507/// 7508/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 7509/// if a memcpy should be used instead. 7510static StmtResult 7511buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 7512 Expr *To, Expr *From, 7513 bool CopyingBaseSubobject, bool Copying, 7514 unsigned Depth = 0) { 7515 // C++11 [class.copy]p28: 7516 // Each subobject is assigned in the manner appropriate to its type: 7517 // 7518 // - if the subobject is of class type, as if by a call to operator= with 7519 // the subobject as the object expression and the corresponding 7520 // subobject of x as a single function argument (as if by explicit 7521 // qualification; that is, ignoring any possible virtual overriding 7522 // functions in more derived classes); 7523 // 7524 // C++03 [class.copy]p13: 7525 // - if the subobject is of class type, the copy assignment operator for 7526 // the class is used (as if by explicit qualification; that is, 7527 // ignoring any possible virtual overriding functions in more derived 7528 // classes); 7529 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 7530 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7531 7532 // Look for operator=. 7533 DeclarationName Name 7534 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7535 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 7536 S.LookupQualifiedName(OpLookup, ClassDecl, false); 7537 7538 // Prior to C++11, filter out any result that isn't a copy/move-assignment 7539 // operator. 7540 if (!S.getLangOpts().CPlusPlus0x) { 7541 LookupResult::Filter F = OpLookup.makeFilter(); 7542 while (F.hasNext()) { 7543 NamedDecl *D = F.next(); 7544 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 7545 if (Method->isCopyAssignmentOperator() || 7546 (!Copying && Method->isMoveAssignmentOperator())) 7547 continue; 7548 7549 F.erase(); 7550 } 7551 F.done(); 7552 } 7553 7554 // Suppress the protected check (C++ [class.protected]) for each of the 7555 // assignment operators we found. This strange dance is required when 7556 // we're assigning via a base classes's copy-assignment operator. To 7557 // ensure that we're getting the right base class subobject (without 7558 // ambiguities), we need to cast "this" to that subobject type; to 7559 // ensure that we don't go through the virtual call mechanism, we need 7560 // to qualify the operator= name with the base class (see below). However, 7561 // this means that if the base class has a protected copy assignment 7562 // operator, the protected member access check will fail. So, we 7563 // rewrite "protected" access to "public" access in this case, since we 7564 // know by construction that we're calling from a derived class. 7565 if (CopyingBaseSubobject) { 7566 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 7567 L != LEnd; ++L) { 7568 if (L.getAccess() == AS_protected) 7569 L.setAccess(AS_public); 7570 } 7571 } 7572 7573 // Create the nested-name-specifier that will be used to qualify the 7574 // reference to operator=; this is required to suppress the virtual 7575 // call mechanism. 7576 CXXScopeSpec SS; 7577 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 7578 SS.MakeTrivial(S.Context, 7579 NestedNameSpecifier::Create(S.Context, 0, false, 7580 CanonicalT), 7581 Loc); 7582 7583 // Create the reference to operator=. 7584 ExprResult OpEqualRef 7585 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 7586 /*TemplateKWLoc=*/SourceLocation(), 7587 /*FirstQualifierInScope=*/0, 7588 OpLookup, 7589 /*TemplateArgs=*/0, 7590 /*SuppressQualifierCheck=*/true); 7591 if (OpEqualRef.isInvalid()) 7592 return StmtError(); 7593 7594 // Build the call to the assignment operator. 7595 7596 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 7597 OpEqualRef.takeAs<Expr>(), 7598 Loc, &From, 1, Loc); 7599 if (Call.isInvalid()) 7600 return StmtError(); 7601 7602 // If we built a call to a trivial 'operator=' while copying an array, 7603 // bail out. We'll replace the whole shebang with a memcpy. 7604 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 7605 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 7606 return StmtResult((Stmt*)0); 7607 7608 // Convert to an expression-statement, and clean up any produced 7609 // temporaries. 7610 return S.ActOnExprStmt(S.MakeFullExpr(Call.take(), Loc)); 7611 } 7612 7613 // - if the subobject is of scalar type, the built-in assignment 7614 // operator is used. 7615 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 7616 if (!ArrayTy) { 7617 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 7618 if (Assignment.isInvalid()) 7619 return StmtError(); 7620 return S.ActOnExprStmt(S.MakeFullExpr(Assignment.take(), Loc)); 7621 } 7622 7623 // - if the subobject is an array, each element is assigned, in the 7624 // manner appropriate to the element type; 7625 7626 // Construct a loop over the array bounds, e.g., 7627 // 7628 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 7629 // 7630 // that will copy each of the array elements. 7631 QualType SizeType = S.Context.getSizeType(); 7632 7633 // Create the iteration variable. 7634 IdentifierInfo *IterationVarName = 0; 7635 { 7636 SmallString<8> Str; 7637 llvm::raw_svector_ostream OS(Str); 7638 OS << "__i" << Depth; 7639 IterationVarName = &S.Context.Idents.get(OS.str()); 7640 } 7641 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 7642 IterationVarName, SizeType, 7643 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 7644 SC_None, SC_None); 7645 7646 // Initialize the iteration variable to zero. 7647 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 7648 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 7649 7650 // Create a reference to the iteration variable; we'll use this several 7651 // times throughout. 7652 Expr *IterationVarRef 7653 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 7654 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 7655 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 7656 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 7657 7658 // Create the DeclStmt that holds the iteration variable. 7659 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 7660 7661 // Subscript the "from" and "to" expressions with the iteration variable. 7662 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 7663 IterationVarRefRVal, 7664 Loc)); 7665 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 7666 IterationVarRefRVal, 7667 Loc)); 7668 if (!Copying) // Cast to rvalue 7669 From = CastForMoving(S, From); 7670 7671 // Build the copy/move for an individual element of the array. 7672 StmtResult Copy = 7673 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 7674 To, From, CopyingBaseSubobject, 7675 Copying, Depth + 1); 7676 // Bail out if copying fails or if we determined that we should use memcpy. 7677 if (Copy.isInvalid() || !Copy.get()) 7678 return Copy; 7679 7680 // Create the comparison against the array bound. 7681 llvm::APInt Upper 7682 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 7683 Expr *Comparison 7684 = new (S.Context) BinaryOperator(IterationVarRefRVal, 7685 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 7686 BO_NE, S.Context.BoolTy, 7687 VK_RValue, OK_Ordinary, Loc, false); 7688 7689 // Create the pre-increment of the iteration variable. 7690 Expr *Increment 7691 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 7692 VK_LValue, OK_Ordinary, Loc); 7693 7694 // Construct the loop that copies all elements of this array. 7695 return S.ActOnForStmt(Loc, Loc, InitStmt, 7696 S.MakeFullExpr(Comparison), 7697 0, S.MakeFullExpr(Increment), 7698 Loc, Copy.take()); 7699} 7700 7701static StmtResult 7702buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 7703 Expr *To, Expr *From, 7704 bool CopyingBaseSubobject, bool Copying) { 7705 // Maybe we should use a memcpy? 7706 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 7707 T.isTriviallyCopyableType(S.Context)) 7708 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 7709 7710 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 7711 CopyingBaseSubobject, 7712 Copying, 0)); 7713 7714 // If we ended up picking a trivial assignment operator for an array of a 7715 // non-trivially-copyable class type, just emit a memcpy. 7716 if (!Result.isInvalid() && !Result.get()) 7717 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 7718 7719 return Result; 7720} 7721 7722/// Determine whether an implicit copy assignment operator for ClassDecl has a 7723/// const argument. 7724/// FIXME: It ought to be possible to store this on the record. 7725static bool isImplicitCopyAssignmentArgConst(Sema &S, 7726 CXXRecordDecl *ClassDecl) { 7727 if (ClassDecl->isInvalidDecl()) 7728 return true; 7729 7730 // C++ [class.copy]p10: 7731 // If the class definition does not explicitly declare a copy 7732 // assignment operator, one is declared implicitly. 7733 // The implicitly-defined copy assignment operator for a class X 7734 // will have the form 7735 // 7736 // X& X::operator=(const X&) 7737 // 7738 // if 7739 // -- each direct base class B of X has a copy assignment operator 7740 // whose parameter is of type const B&, const volatile B& or B, 7741 // and 7742 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7743 BaseEnd = ClassDecl->bases_end(); 7744 Base != BaseEnd; ++Base) { 7745 // We'll handle this below 7746 if (S.getLangOpts().CPlusPlus0x && Base->isVirtual()) 7747 continue; 7748 7749 assert(!Base->getType()->isDependentType() && 7750 "Cannot generate implicit members for class with dependent bases."); 7751 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7752 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, false, 0)) 7753 return false; 7754 } 7755 7756 // In C++11, the above citation has "or virtual" added 7757 if (S.getLangOpts().CPlusPlus0x) { 7758 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7759 BaseEnd = ClassDecl->vbases_end(); 7760 Base != BaseEnd; ++Base) { 7761 assert(!Base->getType()->isDependentType() && 7762 "Cannot generate implicit members for class with dependent bases."); 7763 CXXRecordDecl *BaseClassDecl = Base->getType()->getAsCXXRecordDecl(); 7764 if (!S.LookupCopyingAssignment(BaseClassDecl, Qualifiers::Const, 7765 false, 0)) 7766 return false; 7767 } 7768 } 7769 7770 // -- for all the nonstatic data members of X that are of a class 7771 // type M (or array thereof), each such class type has a copy 7772 // assignment operator whose parameter is of type const M&, 7773 // const volatile M& or M. 7774 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7775 FieldEnd = ClassDecl->field_end(); 7776 Field != FieldEnd; ++Field) { 7777 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 7778 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) 7779 if (!S.LookupCopyingAssignment(FieldClassDecl, Qualifiers::Const, 7780 false, 0)) 7781 return false; 7782 } 7783 7784 // Otherwise, the implicitly declared copy assignment operator will 7785 // have the form 7786 // 7787 // X& X::operator=(X&) 7788 7789 return true; 7790} 7791 7792Sema::ImplicitExceptionSpecification 7793Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 7794 CXXRecordDecl *ClassDecl = MD->getParent(); 7795 7796 ImplicitExceptionSpecification ExceptSpec(*this); 7797 if (ClassDecl->isInvalidDecl()) 7798 return ExceptSpec; 7799 7800 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 7801 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 7802 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 7803 7804 // C++ [except.spec]p14: 7805 // An implicitly declared special member function (Clause 12) shall have an 7806 // exception-specification. [...] 7807 7808 // It is unspecified whether or not an implicit copy assignment operator 7809 // attempts to deduplicate calls to assignment operators of virtual bases are 7810 // made. As such, this exception specification is effectively unspecified. 7811 // Based on a similar decision made for constness in C++0x, we're erring on 7812 // the side of assuming such calls to be made regardless of whether they 7813 // actually happen. 7814 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7815 BaseEnd = ClassDecl->bases_end(); 7816 Base != BaseEnd; ++Base) { 7817 if (Base->isVirtual()) 7818 continue; 7819 7820 CXXRecordDecl *BaseClassDecl 7821 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7822 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7823 ArgQuals, false, 0)) 7824 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7825 } 7826 7827 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 7828 BaseEnd = ClassDecl->vbases_end(); 7829 Base != BaseEnd; ++Base) { 7830 CXXRecordDecl *BaseClassDecl 7831 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 7832 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 7833 ArgQuals, false, 0)) 7834 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 7835 } 7836 7837 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 7838 FieldEnd = ClassDecl->field_end(); 7839 Field != FieldEnd; 7840 ++Field) { 7841 QualType FieldType = Context.getBaseElementType(Field->getType()); 7842 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 7843 if (CXXMethodDecl *CopyAssign = 7844 LookupCopyingAssignment(FieldClassDecl, 7845 ArgQuals | FieldType.getCVRQualifiers(), 7846 false, 0)) 7847 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 7848 } 7849 } 7850 7851 return ExceptSpec; 7852} 7853 7854CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 7855 // Note: The following rules are largely analoguous to the copy 7856 // constructor rules. Note that virtual bases are not taken into account 7857 // for determining the argument type of the operator. Note also that 7858 // operators taking an object instead of a reference are allowed. 7859 7860 QualType ArgType = Context.getTypeDeclType(ClassDecl); 7861 QualType RetType = Context.getLValueReferenceType(ArgType); 7862 if (isImplicitCopyAssignmentArgConst(*this, ClassDecl)) 7863 ArgType = ArgType.withConst(); 7864 ArgType = Context.getLValueReferenceType(ArgType); 7865 7866 // An implicitly-declared copy assignment operator is an inline public 7867 // member of its class. 7868 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 7869 SourceLocation ClassLoc = ClassDecl->getLocation(); 7870 DeclarationNameInfo NameInfo(Name, ClassLoc); 7871 CXXMethodDecl *CopyAssignment 7872 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 7873 /*TInfo=*/0, /*isStatic=*/false, 7874 /*StorageClassAsWritten=*/SC_None, 7875 /*isInline=*/true, /*isConstexpr=*/false, 7876 SourceLocation()); 7877 CopyAssignment->setAccess(AS_public); 7878 CopyAssignment->setDefaulted(); 7879 CopyAssignment->setImplicit(); 7880 CopyAssignment->setTrivial(ClassDecl->hasTrivialCopyAssignment()); 7881 7882 // Build an exception specification pointing back at this member. 7883 FunctionProtoType::ExtProtoInfo EPI; 7884 EPI.ExceptionSpecType = EST_Unevaluated; 7885 EPI.ExceptionSpecDecl = CopyAssignment; 7886 CopyAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 7887 7888 // Add the parameter to the operator. 7889 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 7890 ClassLoc, ClassLoc, /*Id=*/0, 7891 ArgType, /*TInfo=*/0, 7892 SC_None, 7893 SC_None, 0); 7894 CopyAssignment->setParams(FromParam); 7895 7896 // Note that we have added this copy-assignment operator. 7897 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 7898 7899 if (Scope *S = getScopeForContext(ClassDecl)) 7900 PushOnScopeChains(CopyAssignment, S, false); 7901 ClassDecl->addDecl(CopyAssignment); 7902 7903 // C++0x [class.copy]p19: 7904 // .... If the class definition does not explicitly declare a copy 7905 // assignment operator, there is no user-declared move constructor, and 7906 // there is no user-declared move assignment operator, a copy assignment 7907 // operator is implicitly declared as defaulted. 7908 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 7909 CopyAssignment->setDeletedAsWritten(); 7910 7911 AddOverriddenMethods(ClassDecl, CopyAssignment); 7912 return CopyAssignment; 7913} 7914 7915void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 7916 CXXMethodDecl *CopyAssignOperator) { 7917 assert((CopyAssignOperator->isDefaulted() && 7918 CopyAssignOperator->isOverloadedOperator() && 7919 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 7920 !CopyAssignOperator->doesThisDeclarationHaveABody() && 7921 !CopyAssignOperator->isDeleted()) && 7922 "DefineImplicitCopyAssignment called for wrong function"); 7923 7924 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 7925 7926 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 7927 CopyAssignOperator->setInvalidDecl(); 7928 return; 7929 } 7930 7931 CopyAssignOperator->setUsed(); 7932 7933 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 7934 DiagnosticErrorTrap Trap(Diags); 7935 7936 // C++0x [class.copy]p30: 7937 // The implicitly-defined or explicitly-defaulted copy assignment operator 7938 // for a non-union class X performs memberwise copy assignment of its 7939 // subobjects. The direct base classes of X are assigned first, in the 7940 // order of their declaration in the base-specifier-list, and then the 7941 // immediate non-static data members of X are assigned, in the order in 7942 // which they were declared in the class definition. 7943 7944 // The statements that form the synthesized function body. 7945 SmallVector<Stmt*, 8> Statements; 7946 7947 // The parameter for the "other" object, which we are copying from. 7948 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 7949 Qualifiers OtherQuals = Other->getType().getQualifiers(); 7950 QualType OtherRefType = Other->getType(); 7951 if (const LValueReferenceType *OtherRef 7952 = OtherRefType->getAs<LValueReferenceType>()) { 7953 OtherRefType = OtherRef->getPointeeType(); 7954 OtherQuals = OtherRefType.getQualifiers(); 7955 } 7956 7957 // Our location for everything implicitly-generated. 7958 SourceLocation Loc = CopyAssignOperator->getLocation(); 7959 7960 // Construct a reference to the "other" object. We'll be using this 7961 // throughout the generated ASTs. 7962 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 7963 assert(OtherRef && "Reference to parameter cannot fail!"); 7964 7965 // Construct the "this" pointer. We'll be using this throughout the generated 7966 // ASTs. 7967 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 7968 assert(This && "Reference to this cannot fail!"); 7969 7970 // Assign base classes. 7971 bool Invalid = false; 7972 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 7973 E = ClassDecl->bases_end(); Base != E; ++Base) { 7974 // Form the assignment: 7975 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 7976 QualType BaseType = Base->getType().getUnqualifiedType(); 7977 if (!BaseType->isRecordType()) { 7978 Invalid = true; 7979 continue; 7980 } 7981 7982 CXXCastPath BasePath; 7983 BasePath.push_back(Base); 7984 7985 // Construct the "from" expression, which is an implicit cast to the 7986 // appropriately-qualified base type. 7987 Expr *From = OtherRef; 7988 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 7989 CK_UncheckedDerivedToBase, 7990 VK_LValue, &BasePath).take(); 7991 7992 // Dereference "this". 7993 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 7994 7995 // Implicitly cast "this" to the appropriately-qualified base type. 7996 To = ImpCastExprToType(To.take(), 7997 Context.getCVRQualifiedType(BaseType, 7998 CopyAssignOperator->getTypeQualifiers()), 7999 CK_UncheckedDerivedToBase, 8000 VK_LValue, &BasePath); 8001 8002 // Build the copy. 8003 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8004 To.get(), From, 8005 /*CopyingBaseSubobject=*/true, 8006 /*Copying=*/true); 8007 if (Copy.isInvalid()) { 8008 Diag(CurrentLocation, diag::note_member_synthesized_at) 8009 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8010 CopyAssignOperator->setInvalidDecl(); 8011 return; 8012 } 8013 8014 // Success! Record the copy. 8015 Statements.push_back(Copy.takeAs<Expr>()); 8016 } 8017 8018 // Assign non-static members. 8019 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8020 FieldEnd = ClassDecl->field_end(); 8021 Field != FieldEnd; ++Field) { 8022 if (Field->isUnnamedBitfield()) 8023 continue; 8024 8025 // Check for members of reference type; we can't copy those. 8026 if (Field->getType()->isReferenceType()) { 8027 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8028 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8029 Diag(Field->getLocation(), diag::note_declared_at); 8030 Diag(CurrentLocation, diag::note_member_synthesized_at) 8031 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8032 Invalid = true; 8033 continue; 8034 } 8035 8036 // Check for members of const-qualified, non-class type. 8037 QualType BaseType = Context.getBaseElementType(Field->getType()); 8038 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8039 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8040 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8041 Diag(Field->getLocation(), diag::note_declared_at); 8042 Diag(CurrentLocation, diag::note_member_synthesized_at) 8043 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8044 Invalid = true; 8045 continue; 8046 } 8047 8048 // Suppress assigning zero-width bitfields. 8049 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8050 continue; 8051 8052 QualType FieldType = Field->getType().getNonReferenceType(); 8053 if (FieldType->isIncompleteArrayType()) { 8054 assert(ClassDecl->hasFlexibleArrayMember() && 8055 "Incomplete array type is not valid"); 8056 continue; 8057 } 8058 8059 // Build references to the field in the object we're copying from and to. 8060 CXXScopeSpec SS; // Intentionally empty 8061 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8062 LookupMemberName); 8063 MemberLookup.addDecl(*Field); 8064 MemberLookup.resolveKind(); 8065 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8066 Loc, /*IsArrow=*/false, 8067 SS, SourceLocation(), 0, 8068 MemberLookup, 0); 8069 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8070 Loc, /*IsArrow=*/true, 8071 SS, SourceLocation(), 0, 8072 MemberLookup, 0); 8073 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8074 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8075 8076 // Build the copy of this field. 8077 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8078 To.get(), From.get(), 8079 /*CopyingBaseSubobject=*/false, 8080 /*Copying=*/true); 8081 if (Copy.isInvalid()) { 8082 Diag(CurrentLocation, diag::note_member_synthesized_at) 8083 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8084 CopyAssignOperator->setInvalidDecl(); 8085 return; 8086 } 8087 8088 // Success! Record the copy. 8089 Statements.push_back(Copy.takeAs<Stmt>()); 8090 } 8091 8092 if (!Invalid) { 8093 // Add a "return *this;" 8094 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8095 8096 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8097 if (Return.isInvalid()) 8098 Invalid = true; 8099 else { 8100 Statements.push_back(Return.takeAs<Stmt>()); 8101 8102 if (Trap.hasErrorOccurred()) { 8103 Diag(CurrentLocation, diag::note_member_synthesized_at) 8104 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8105 Invalid = true; 8106 } 8107 } 8108 } 8109 8110 if (Invalid) { 8111 CopyAssignOperator->setInvalidDecl(); 8112 return; 8113 } 8114 8115 StmtResult Body; 8116 { 8117 CompoundScopeRAII CompoundScope(*this); 8118 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8119 /*isStmtExpr=*/false); 8120 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8121 } 8122 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8123 8124 if (ASTMutationListener *L = getASTMutationListener()) { 8125 L->CompletedImplicitDefinition(CopyAssignOperator); 8126 } 8127} 8128 8129Sema::ImplicitExceptionSpecification 8130Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8131 CXXRecordDecl *ClassDecl = MD->getParent(); 8132 8133 ImplicitExceptionSpecification ExceptSpec(*this); 8134 if (ClassDecl->isInvalidDecl()) 8135 return ExceptSpec; 8136 8137 // C++0x [except.spec]p14: 8138 // An implicitly declared special member function (Clause 12) shall have an 8139 // exception-specification. [...] 8140 8141 // It is unspecified whether or not an implicit move assignment operator 8142 // attempts to deduplicate calls to assignment operators of virtual bases are 8143 // made. As such, this exception specification is effectively unspecified. 8144 // Based on a similar decision made for constness in C++0x, we're erring on 8145 // the side of assuming such calls to be made regardless of whether they 8146 // actually happen. 8147 // Note that a move constructor is not implicitly declared when there are 8148 // virtual bases, but it can still be user-declared and explicitly defaulted. 8149 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8150 BaseEnd = ClassDecl->bases_end(); 8151 Base != BaseEnd; ++Base) { 8152 if (Base->isVirtual()) 8153 continue; 8154 8155 CXXRecordDecl *BaseClassDecl 8156 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8157 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8158 0, false, 0)) 8159 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8160 } 8161 8162 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8163 BaseEnd = ClassDecl->vbases_end(); 8164 Base != BaseEnd; ++Base) { 8165 CXXRecordDecl *BaseClassDecl 8166 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8167 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8168 0, false, 0)) 8169 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8170 } 8171 8172 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8173 FieldEnd = ClassDecl->field_end(); 8174 Field != FieldEnd; 8175 ++Field) { 8176 QualType FieldType = Context.getBaseElementType(Field->getType()); 8177 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8178 if (CXXMethodDecl *MoveAssign = 8179 LookupMovingAssignment(FieldClassDecl, 8180 FieldType.getCVRQualifiers(), 8181 false, 0)) 8182 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8183 } 8184 } 8185 8186 return ExceptSpec; 8187} 8188 8189/// Determine whether the class type has any direct or indirect virtual base 8190/// classes which have a non-trivial move assignment operator. 8191static bool 8192hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8193 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8194 BaseEnd = ClassDecl->vbases_end(); 8195 Base != BaseEnd; ++Base) { 8196 CXXRecordDecl *BaseClass = 8197 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8198 8199 // Try to declare the move assignment. If it would be deleted, then the 8200 // class does not have a non-trivial move assignment. 8201 if (BaseClass->needsImplicitMoveAssignment()) 8202 S.DeclareImplicitMoveAssignment(BaseClass); 8203 8204 // If the class has both a trivial move assignment and a non-trivial move 8205 // assignment, hasTrivialMoveAssignment() is false. 8206 if (BaseClass->hasDeclaredMoveAssignment() && 8207 !BaseClass->hasTrivialMoveAssignment()) 8208 return true; 8209 } 8210 8211 return false; 8212} 8213 8214/// Determine whether the given type either has a move constructor or is 8215/// trivially copyable. 8216static bool 8217hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8218 Type = S.Context.getBaseElementType(Type); 8219 8220 // FIXME: Technically, non-trivially-copyable non-class types, such as 8221 // reference types, are supposed to return false here, but that appears 8222 // to be a standard defect. 8223 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8224 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8225 return true; 8226 8227 if (Type.isTriviallyCopyableType(S.Context)) 8228 return true; 8229 8230 if (IsConstructor) { 8231 if (ClassDecl->needsImplicitMoveConstructor()) 8232 S.DeclareImplicitMoveConstructor(ClassDecl); 8233 return ClassDecl->hasDeclaredMoveConstructor(); 8234 } 8235 8236 if (ClassDecl->needsImplicitMoveAssignment()) 8237 S.DeclareImplicitMoveAssignment(ClassDecl); 8238 return ClassDecl->hasDeclaredMoveAssignment(); 8239} 8240 8241/// Determine whether all non-static data members and direct or virtual bases 8242/// of class \p ClassDecl have either a move operation, or are trivially 8243/// copyable. 8244static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8245 bool IsConstructor) { 8246 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8247 BaseEnd = ClassDecl->bases_end(); 8248 Base != BaseEnd; ++Base) { 8249 if (Base->isVirtual()) 8250 continue; 8251 8252 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8253 return false; 8254 } 8255 8256 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8257 BaseEnd = ClassDecl->vbases_end(); 8258 Base != BaseEnd; ++Base) { 8259 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8260 return false; 8261 } 8262 8263 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8264 FieldEnd = ClassDecl->field_end(); 8265 Field != FieldEnd; ++Field) { 8266 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8267 return false; 8268 } 8269 8270 return true; 8271} 8272 8273CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8274 // C++11 [class.copy]p20: 8275 // If the definition of a class X does not explicitly declare a move 8276 // assignment operator, one will be implicitly declared as defaulted 8277 // if and only if: 8278 // 8279 // - [first 4 bullets] 8280 assert(ClassDecl->needsImplicitMoveAssignment()); 8281 8282 // [Checked after we build the declaration] 8283 // - the move assignment operator would not be implicitly defined as 8284 // deleted, 8285 8286 // [DR1402]: 8287 // - X has no direct or indirect virtual base class with a non-trivial 8288 // move assignment operator, and 8289 // - each of X's non-static data members and direct or virtual base classes 8290 // has a type that either has a move assignment operator or is trivially 8291 // copyable. 8292 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8293 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8294 ClassDecl->setFailedImplicitMoveAssignment(); 8295 return 0; 8296 } 8297 8298 // Note: The following rules are largely analoguous to the move 8299 // constructor rules. 8300 8301 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8302 QualType RetType = Context.getLValueReferenceType(ArgType); 8303 ArgType = Context.getRValueReferenceType(ArgType); 8304 8305 // An implicitly-declared move assignment operator is an inline public 8306 // member of its class. 8307 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8308 SourceLocation ClassLoc = ClassDecl->getLocation(); 8309 DeclarationNameInfo NameInfo(Name, ClassLoc); 8310 CXXMethodDecl *MoveAssignment 8311 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8312 /*TInfo=*/0, /*isStatic=*/false, 8313 /*StorageClassAsWritten=*/SC_None, 8314 /*isInline=*/true, 8315 /*isConstexpr=*/false, 8316 SourceLocation()); 8317 MoveAssignment->setAccess(AS_public); 8318 MoveAssignment->setDefaulted(); 8319 MoveAssignment->setImplicit(); 8320 MoveAssignment->setTrivial(ClassDecl->hasTrivialMoveAssignment()); 8321 8322 // Build an exception specification pointing back at this member. 8323 FunctionProtoType::ExtProtoInfo EPI; 8324 EPI.ExceptionSpecType = EST_Unevaluated; 8325 EPI.ExceptionSpecDecl = MoveAssignment; 8326 MoveAssignment->setType(Context.getFunctionType(RetType, &ArgType, 1, EPI)); 8327 8328 // Add the parameter to the operator. 8329 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8330 ClassLoc, ClassLoc, /*Id=*/0, 8331 ArgType, /*TInfo=*/0, 8332 SC_None, 8333 SC_None, 0); 8334 MoveAssignment->setParams(FromParam); 8335 8336 // Note that we have added this copy-assignment operator. 8337 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8338 8339 // C++0x [class.copy]p9: 8340 // If the definition of a class X does not explicitly declare a move 8341 // assignment operator, one will be implicitly declared as defaulted if and 8342 // only if: 8343 // [...] 8344 // - the move assignment operator would not be implicitly defined as 8345 // deleted. 8346 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8347 // Cache this result so that we don't try to generate this over and over 8348 // on every lookup, leaking memory and wasting time. 8349 ClassDecl->setFailedImplicitMoveAssignment(); 8350 return 0; 8351 } 8352 8353 if (Scope *S = getScopeForContext(ClassDecl)) 8354 PushOnScopeChains(MoveAssignment, S, false); 8355 ClassDecl->addDecl(MoveAssignment); 8356 8357 AddOverriddenMethods(ClassDecl, MoveAssignment); 8358 return MoveAssignment; 8359} 8360 8361void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8362 CXXMethodDecl *MoveAssignOperator) { 8363 assert((MoveAssignOperator->isDefaulted() && 8364 MoveAssignOperator->isOverloadedOperator() && 8365 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8366 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8367 !MoveAssignOperator->isDeleted()) && 8368 "DefineImplicitMoveAssignment called for wrong function"); 8369 8370 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8371 8372 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8373 MoveAssignOperator->setInvalidDecl(); 8374 return; 8375 } 8376 8377 MoveAssignOperator->setUsed(); 8378 8379 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8380 DiagnosticErrorTrap Trap(Diags); 8381 8382 // C++0x [class.copy]p28: 8383 // The implicitly-defined or move assignment operator for a non-union class 8384 // X performs memberwise move assignment of its subobjects. The direct base 8385 // classes of X are assigned first, in the order of their declaration in the 8386 // base-specifier-list, and then the immediate non-static data members of X 8387 // are assigned, in the order in which they were declared in the class 8388 // definition. 8389 8390 // The statements that form the synthesized function body. 8391 SmallVector<Stmt*, 8> Statements; 8392 8393 // The parameter for the "other" object, which we are move from. 8394 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8395 QualType OtherRefType = Other->getType()-> 8396 getAs<RValueReferenceType>()->getPointeeType(); 8397 assert(OtherRefType.getQualifiers() == 0 && 8398 "Bad argument type of defaulted move assignment"); 8399 8400 // Our location for everything implicitly-generated. 8401 SourceLocation Loc = MoveAssignOperator->getLocation(); 8402 8403 // Construct a reference to the "other" object. We'll be using this 8404 // throughout the generated ASTs. 8405 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8406 assert(OtherRef && "Reference to parameter cannot fail!"); 8407 // Cast to rvalue. 8408 OtherRef = CastForMoving(*this, OtherRef); 8409 8410 // Construct the "this" pointer. We'll be using this throughout the generated 8411 // ASTs. 8412 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8413 assert(This && "Reference to this cannot fail!"); 8414 8415 // Assign base classes. 8416 bool Invalid = false; 8417 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8418 E = ClassDecl->bases_end(); Base != E; ++Base) { 8419 // Form the assignment: 8420 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8421 QualType BaseType = Base->getType().getUnqualifiedType(); 8422 if (!BaseType->isRecordType()) { 8423 Invalid = true; 8424 continue; 8425 } 8426 8427 CXXCastPath BasePath; 8428 BasePath.push_back(Base); 8429 8430 // Construct the "from" expression, which is an implicit cast to the 8431 // appropriately-qualified base type. 8432 Expr *From = OtherRef; 8433 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 8434 VK_XValue, &BasePath).take(); 8435 8436 // Dereference "this". 8437 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8438 8439 // Implicitly cast "this" to the appropriately-qualified base type. 8440 To = ImpCastExprToType(To.take(), 8441 Context.getCVRQualifiedType(BaseType, 8442 MoveAssignOperator->getTypeQualifiers()), 8443 CK_UncheckedDerivedToBase, 8444 VK_LValue, &BasePath); 8445 8446 // Build the move. 8447 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 8448 To.get(), From, 8449 /*CopyingBaseSubobject=*/true, 8450 /*Copying=*/false); 8451 if (Move.isInvalid()) { 8452 Diag(CurrentLocation, diag::note_member_synthesized_at) 8453 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8454 MoveAssignOperator->setInvalidDecl(); 8455 return; 8456 } 8457 8458 // Success! Record the move. 8459 Statements.push_back(Move.takeAs<Expr>()); 8460 } 8461 8462 // Assign non-static members. 8463 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8464 FieldEnd = ClassDecl->field_end(); 8465 Field != FieldEnd; ++Field) { 8466 if (Field->isUnnamedBitfield()) 8467 continue; 8468 8469 // Check for members of reference type; we can't move those. 8470 if (Field->getType()->isReferenceType()) { 8471 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8472 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8473 Diag(Field->getLocation(), diag::note_declared_at); 8474 Diag(CurrentLocation, diag::note_member_synthesized_at) 8475 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8476 Invalid = true; 8477 continue; 8478 } 8479 8480 // Check for members of const-qualified, non-class type. 8481 QualType BaseType = Context.getBaseElementType(Field->getType()); 8482 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8483 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8484 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8485 Diag(Field->getLocation(), diag::note_declared_at); 8486 Diag(CurrentLocation, diag::note_member_synthesized_at) 8487 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8488 Invalid = true; 8489 continue; 8490 } 8491 8492 // Suppress assigning zero-width bitfields. 8493 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8494 continue; 8495 8496 QualType FieldType = Field->getType().getNonReferenceType(); 8497 if (FieldType->isIncompleteArrayType()) { 8498 assert(ClassDecl->hasFlexibleArrayMember() && 8499 "Incomplete array type is not valid"); 8500 continue; 8501 } 8502 8503 // Build references to the field in the object we're copying from and to. 8504 CXXScopeSpec SS; // Intentionally empty 8505 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8506 LookupMemberName); 8507 MemberLookup.addDecl(*Field); 8508 MemberLookup.resolveKind(); 8509 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8510 Loc, /*IsArrow=*/false, 8511 SS, SourceLocation(), 0, 8512 MemberLookup, 0); 8513 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8514 Loc, /*IsArrow=*/true, 8515 SS, SourceLocation(), 0, 8516 MemberLookup, 0); 8517 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8518 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8519 8520 assert(!From.get()->isLValue() && // could be xvalue or prvalue 8521 "Member reference with rvalue base must be rvalue except for reference " 8522 "members, which aren't allowed for move assignment."); 8523 8524 // Build the move of this field. 8525 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 8526 To.get(), From.get(), 8527 /*CopyingBaseSubobject=*/false, 8528 /*Copying=*/false); 8529 if (Move.isInvalid()) { 8530 Diag(CurrentLocation, diag::note_member_synthesized_at) 8531 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8532 MoveAssignOperator->setInvalidDecl(); 8533 return; 8534 } 8535 8536 // Success! Record the copy. 8537 Statements.push_back(Move.takeAs<Stmt>()); 8538 } 8539 8540 if (!Invalid) { 8541 // Add a "return *this;" 8542 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8543 8544 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8545 if (Return.isInvalid()) 8546 Invalid = true; 8547 else { 8548 Statements.push_back(Return.takeAs<Stmt>()); 8549 8550 if (Trap.hasErrorOccurred()) { 8551 Diag(CurrentLocation, diag::note_member_synthesized_at) 8552 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 8553 Invalid = true; 8554 } 8555 } 8556 } 8557 8558 if (Invalid) { 8559 MoveAssignOperator->setInvalidDecl(); 8560 return; 8561 } 8562 8563 StmtResult Body; 8564 { 8565 CompoundScopeRAII CompoundScope(*this); 8566 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8567 /*isStmtExpr=*/false); 8568 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8569 } 8570 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 8571 8572 if (ASTMutationListener *L = getASTMutationListener()) { 8573 L->CompletedImplicitDefinition(MoveAssignOperator); 8574 } 8575} 8576 8577/// Determine whether an implicit copy constructor for ClassDecl has a const 8578/// argument. 8579/// FIXME: It ought to be possible to store this on the record. 8580static bool isImplicitCopyCtorArgConst(Sema &S, CXXRecordDecl *ClassDecl) { 8581 if (ClassDecl->isInvalidDecl()) 8582 return true; 8583 8584 // C++ [class.copy]p5: 8585 // The implicitly-declared copy constructor for a class X will 8586 // have the form 8587 // 8588 // X::X(const X&) 8589 // 8590 // if 8591 // -- each direct or virtual base class B of X has a copy 8592 // constructor whose first parameter is of type const B& or 8593 // const volatile B&, and 8594 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8595 BaseEnd = ClassDecl->bases_end(); 8596 Base != BaseEnd; ++Base) { 8597 // Virtual bases are handled below. 8598 if (Base->isVirtual()) 8599 continue; 8600 8601 CXXRecordDecl *BaseClassDecl 8602 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8603 // FIXME: This lookup is wrong. If the copy ctor for a member or base is 8604 // ambiguous, we should still produce a constructor with a const-qualified 8605 // parameter. 8606 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8607 return false; 8608 } 8609 8610 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8611 BaseEnd = ClassDecl->vbases_end(); 8612 Base != BaseEnd; ++Base) { 8613 CXXRecordDecl *BaseClassDecl 8614 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8615 if (!S.LookupCopyingConstructor(BaseClassDecl, Qualifiers::Const)) 8616 return false; 8617 } 8618 8619 // -- for all the nonstatic data members of X that are of a 8620 // class type M (or array thereof), each such class type 8621 // has a copy constructor whose first parameter is of type 8622 // const M& or const volatile M&. 8623 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8624 FieldEnd = ClassDecl->field_end(); 8625 Field != FieldEnd; ++Field) { 8626 QualType FieldType = S.Context.getBaseElementType(Field->getType()); 8627 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8628 if (!S.LookupCopyingConstructor(FieldClassDecl, Qualifiers::Const)) 8629 return false; 8630 } 8631 } 8632 8633 // Otherwise, the implicitly declared copy constructor will have 8634 // the form 8635 // 8636 // X::X(X&) 8637 8638 return true; 8639} 8640 8641Sema::ImplicitExceptionSpecification 8642Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 8643 CXXRecordDecl *ClassDecl = MD->getParent(); 8644 8645 ImplicitExceptionSpecification ExceptSpec(*this); 8646 if (ClassDecl->isInvalidDecl()) 8647 return ExceptSpec; 8648 8649 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8650 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 8651 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8652 8653 // C++ [except.spec]p14: 8654 // An implicitly declared special member function (Clause 12) shall have an 8655 // exception-specification. [...] 8656 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8657 BaseEnd = ClassDecl->bases_end(); 8658 Base != BaseEnd; 8659 ++Base) { 8660 // Virtual bases are handled below. 8661 if (Base->isVirtual()) 8662 continue; 8663 8664 CXXRecordDecl *BaseClassDecl 8665 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8666 if (CXXConstructorDecl *CopyConstructor = 8667 LookupCopyingConstructor(BaseClassDecl, Quals)) 8668 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8669 } 8670 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8671 BaseEnd = ClassDecl->vbases_end(); 8672 Base != BaseEnd; 8673 ++Base) { 8674 CXXRecordDecl *BaseClassDecl 8675 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8676 if (CXXConstructorDecl *CopyConstructor = 8677 LookupCopyingConstructor(BaseClassDecl, Quals)) 8678 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 8679 } 8680 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8681 FieldEnd = ClassDecl->field_end(); 8682 Field != FieldEnd; 8683 ++Field) { 8684 QualType FieldType = Context.getBaseElementType(Field->getType()); 8685 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8686 if (CXXConstructorDecl *CopyConstructor = 8687 LookupCopyingConstructor(FieldClassDecl, 8688 Quals | FieldType.getCVRQualifiers())) 8689 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 8690 } 8691 } 8692 8693 return ExceptSpec; 8694} 8695 8696CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 8697 CXXRecordDecl *ClassDecl) { 8698 // C++ [class.copy]p4: 8699 // If the class definition does not explicitly declare a copy 8700 // constructor, one is declared implicitly. 8701 8702 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8703 QualType ArgType = ClassType; 8704 bool Const = isImplicitCopyCtorArgConst(*this, ClassDecl); 8705 if (Const) 8706 ArgType = ArgType.withConst(); 8707 ArgType = Context.getLValueReferenceType(ArgType); 8708 8709 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8710 CXXCopyConstructor, 8711 Const); 8712 8713 DeclarationName Name 8714 = Context.DeclarationNames.getCXXConstructorName( 8715 Context.getCanonicalType(ClassType)); 8716 SourceLocation ClassLoc = ClassDecl->getLocation(); 8717 DeclarationNameInfo NameInfo(Name, ClassLoc); 8718 8719 // An implicitly-declared copy constructor is an inline public 8720 // member of its class. 8721 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 8722 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8723 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8724 Constexpr); 8725 CopyConstructor->setAccess(AS_public); 8726 CopyConstructor->setDefaulted(); 8727 CopyConstructor->setTrivial(ClassDecl->hasTrivialCopyConstructor()); 8728 8729 // Build an exception specification pointing back at this member. 8730 FunctionProtoType::ExtProtoInfo EPI; 8731 EPI.ExceptionSpecType = EST_Unevaluated; 8732 EPI.ExceptionSpecDecl = CopyConstructor; 8733 CopyConstructor->setType( 8734 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8735 8736 // Note that we have declared this constructor. 8737 ++ASTContext::NumImplicitCopyConstructorsDeclared; 8738 8739 // Add the parameter to the constructor. 8740 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 8741 ClassLoc, ClassLoc, 8742 /*IdentifierInfo=*/0, 8743 ArgType, /*TInfo=*/0, 8744 SC_None, 8745 SC_None, 0); 8746 CopyConstructor->setParams(FromParam); 8747 8748 if (Scope *S = getScopeForContext(ClassDecl)) 8749 PushOnScopeChains(CopyConstructor, S, false); 8750 ClassDecl->addDecl(CopyConstructor); 8751 8752 // C++11 [class.copy]p8: 8753 // ... If the class definition does not explicitly declare a copy 8754 // constructor, there is no user-declared move constructor, and there is no 8755 // user-declared move assignment operator, a copy constructor is implicitly 8756 // declared as defaulted. 8757 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 8758 CopyConstructor->setDeletedAsWritten(); 8759 8760 return CopyConstructor; 8761} 8762 8763void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 8764 CXXConstructorDecl *CopyConstructor) { 8765 assert((CopyConstructor->isDefaulted() && 8766 CopyConstructor->isCopyConstructor() && 8767 !CopyConstructor->doesThisDeclarationHaveABody() && 8768 !CopyConstructor->isDeleted()) && 8769 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 8770 8771 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 8772 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 8773 8774 SynthesizedFunctionScope Scope(*this, CopyConstructor); 8775 DiagnosticErrorTrap Trap(Diags); 8776 8777 if (SetCtorInitializers(CopyConstructor, 0, 0, /*AnyErrors=*/false) || 8778 Trap.hasErrorOccurred()) { 8779 Diag(CurrentLocation, diag::note_member_synthesized_at) 8780 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 8781 CopyConstructor->setInvalidDecl(); 8782 } else { 8783 Sema::CompoundScopeRAII CompoundScope(*this); 8784 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 8785 CopyConstructor->getLocation(), 8786 MultiStmtArg(), 8787 /*isStmtExpr=*/false) 8788 .takeAs<Stmt>()); 8789 CopyConstructor->setImplicitlyDefined(true); 8790 } 8791 8792 CopyConstructor->setUsed(); 8793 if (ASTMutationListener *L = getASTMutationListener()) { 8794 L->CompletedImplicitDefinition(CopyConstructor); 8795 } 8796} 8797 8798Sema::ImplicitExceptionSpecification 8799Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 8800 CXXRecordDecl *ClassDecl = MD->getParent(); 8801 8802 // C++ [except.spec]p14: 8803 // An implicitly declared special member function (Clause 12) shall have an 8804 // exception-specification. [...] 8805 ImplicitExceptionSpecification ExceptSpec(*this); 8806 if (ClassDecl->isInvalidDecl()) 8807 return ExceptSpec; 8808 8809 // Direct base-class constructors. 8810 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 8811 BEnd = ClassDecl->bases_end(); 8812 B != BEnd; ++B) { 8813 if (B->isVirtual()) // Handled below. 8814 continue; 8815 8816 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8817 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8818 CXXConstructorDecl *Constructor = 8819 LookupMovingConstructor(BaseClassDecl, 0); 8820 // If this is a deleted function, add it anyway. This might be conformant 8821 // with the standard. This might not. I'm not sure. It might not matter. 8822 if (Constructor) 8823 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8824 } 8825 } 8826 8827 // Virtual base-class constructors. 8828 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 8829 BEnd = ClassDecl->vbases_end(); 8830 B != BEnd; ++B) { 8831 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 8832 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 8833 CXXConstructorDecl *Constructor = 8834 LookupMovingConstructor(BaseClassDecl, 0); 8835 // If this is a deleted function, add it anyway. This might be conformant 8836 // with the standard. This might not. I'm not sure. It might not matter. 8837 if (Constructor) 8838 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 8839 } 8840 } 8841 8842 // Field constructors. 8843 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 8844 FEnd = ClassDecl->field_end(); 8845 F != FEnd; ++F) { 8846 QualType FieldType = Context.getBaseElementType(F->getType()); 8847 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 8848 CXXConstructorDecl *Constructor = 8849 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 8850 // If this is a deleted function, add it anyway. This might be conformant 8851 // with the standard. This might not. I'm not sure. It might not matter. 8852 // In particular, the problem is that this function never gets called. It 8853 // might just be ill-formed because this function attempts to refer to 8854 // a deleted function here. 8855 if (Constructor) 8856 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 8857 } 8858 } 8859 8860 return ExceptSpec; 8861} 8862 8863CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 8864 CXXRecordDecl *ClassDecl) { 8865 // C++11 [class.copy]p9: 8866 // If the definition of a class X does not explicitly declare a move 8867 // constructor, one will be implicitly declared as defaulted if and only if: 8868 // 8869 // - [first 4 bullets] 8870 assert(ClassDecl->needsImplicitMoveConstructor()); 8871 8872 // [Checked after we build the declaration] 8873 // - the move assignment operator would not be implicitly defined as 8874 // deleted, 8875 8876 // [DR1402]: 8877 // - each of X's non-static data members and direct or virtual base classes 8878 // has a type that either has a move constructor or is trivially copyable. 8879 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 8880 ClassDecl->setFailedImplicitMoveConstructor(); 8881 return 0; 8882 } 8883 8884 QualType ClassType = Context.getTypeDeclType(ClassDecl); 8885 QualType ArgType = Context.getRValueReferenceType(ClassType); 8886 8887 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 8888 CXXMoveConstructor, 8889 false); 8890 8891 DeclarationName Name 8892 = Context.DeclarationNames.getCXXConstructorName( 8893 Context.getCanonicalType(ClassType)); 8894 SourceLocation ClassLoc = ClassDecl->getLocation(); 8895 DeclarationNameInfo NameInfo(Name, ClassLoc); 8896 8897 // C++0x [class.copy]p11: 8898 // An implicitly-declared copy/move constructor is an inline public 8899 // member of its class. 8900 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 8901 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 8902 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 8903 Constexpr); 8904 MoveConstructor->setAccess(AS_public); 8905 MoveConstructor->setDefaulted(); 8906 MoveConstructor->setTrivial(ClassDecl->hasTrivialMoveConstructor()); 8907 8908 // Build an exception specification pointing back at this member. 8909 FunctionProtoType::ExtProtoInfo EPI; 8910 EPI.ExceptionSpecType = EST_Unevaluated; 8911 EPI.ExceptionSpecDecl = MoveConstructor; 8912 MoveConstructor->setType( 8913 Context.getFunctionType(Context.VoidTy, &ArgType, 1, EPI)); 8914 8915 // Add the parameter to the constructor. 8916 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 8917 ClassLoc, ClassLoc, 8918 /*IdentifierInfo=*/0, 8919 ArgType, /*TInfo=*/0, 8920 SC_None, 8921 SC_None, 0); 8922 MoveConstructor->setParams(FromParam); 8923 8924 // C++0x [class.copy]p9: 8925 // If the definition of a class X does not explicitly declare a move 8926 // constructor, one will be implicitly declared as defaulted if and only if: 8927 // [...] 8928 // - the move constructor would not be implicitly defined as deleted. 8929 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 8930 // Cache this result so that we don't try to generate this over and over 8931 // on every lookup, leaking memory and wasting time. 8932 ClassDecl->setFailedImplicitMoveConstructor(); 8933 return 0; 8934 } 8935 8936 // Note that we have declared this constructor. 8937 ++ASTContext::NumImplicitMoveConstructorsDeclared; 8938 8939 if (Scope *S = getScopeForContext(ClassDecl)) 8940 PushOnScopeChains(MoveConstructor, S, false); 8941 ClassDecl->addDecl(MoveConstructor); 8942 8943 return MoveConstructor; 8944} 8945 8946void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 8947 CXXConstructorDecl *MoveConstructor) { 8948 assert((MoveConstructor->isDefaulted() && 8949 MoveConstructor->isMoveConstructor() && 8950 !MoveConstructor->doesThisDeclarationHaveABody() && 8951 !MoveConstructor->isDeleted()) && 8952 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 8953 8954 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 8955 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 8956 8957 SynthesizedFunctionScope Scope(*this, MoveConstructor); 8958 DiagnosticErrorTrap Trap(Diags); 8959 8960 if (SetCtorInitializers(MoveConstructor, 0, 0, /*AnyErrors=*/false) || 8961 Trap.hasErrorOccurred()) { 8962 Diag(CurrentLocation, diag::note_member_synthesized_at) 8963 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 8964 MoveConstructor->setInvalidDecl(); 8965 } else { 8966 Sema::CompoundScopeRAII CompoundScope(*this); 8967 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 8968 MoveConstructor->getLocation(), 8969 MultiStmtArg(), 8970 /*isStmtExpr=*/false) 8971 .takeAs<Stmt>()); 8972 MoveConstructor->setImplicitlyDefined(true); 8973 } 8974 8975 MoveConstructor->setUsed(); 8976 8977 if (ASTMutationListener *L = getASTMutationListener()) { 8978 L->CompletedImplicitDefinition(MoveConstructor); 8979 } 8980} 8981 8982bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 8983 return FD->isDeleted() && 8984 (FD->isDefaulted() || FD->isImplicit()) && 8985 isa<CXXMethodDecl>(FD); 8986} 8987 8988/// \brief Mark the call operator of the given lambda closure type as "used". 8989static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 8990 CXXMethodDecl *CallOperator 8991 = cast<CXXMethodDecl>( 8992 *Lambda->lookup( 8993 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).first); 8994 CallOperator->setReferenced(); 8995 CallOperator->setUsed(); 8996} 8997 8998void Sema::DefineImplicitLambdaToFunctionPointerConversion( 8999 SourceLocation CurrentLocation, 9000 CXXConversionDecl *Conv) 9001{ 9002 CXXRecordDecl *Lambda = Conv->getParent(); 9003 9004 // Make sure that the lambda call operator is marked used. 9005 markLambdaCallOperatorUsed(*this, Lambda); 9006 9007 Conv->setUsed(); 9008 9009 SynthesizedFunctionScope Scope(*this, Conv); 9010 DiagnosticErrorTrap Trap(Diags); 9011 9012 // Return the address of the __invoke function. 9013 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9014 CXXMethodDecl *Invoke 9015 = cast<CXXMethodDecl>(*Lambda->lookup(InvokeName).first); 9016 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9017 VK_LValue, Conv->getLocation()).take(); 9018 assert(FunctionRef && "Can't refer to __invoke function?"); 9019 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9020 Conv->setBody(new (Context) CompoundStmt(Context, &Return, 1, 9021 Conv->getLocation(), 9022 Conv->getLocation())); 9023 9024 // Fill in the __invoke function with a dummy implementation. IR generation 9025 // will fill in the actual details. 9026 Invoke->setUsed(); 9027 Invoke->setReferenced(); 9028 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9029 9030 if (ASTMutationListener *L = getASTMutationListener()) { 9031 L->CompletedImplicitDefinition(Conv); 9032 L->CompletedImplicitDefinition(Invoke); 9033 } 9034} 9035 9036void Sema::DefineImplicitLambdaToBlockPointerConversion( 9037 SourceLocation CurrentLocation, 9038 CXXConversionDecl *Conv) 9039{ 9040 Conv->setUsed(); 9041 9042 SynthesizedFunctionScope Scope(*this, Conv); 9043 DiagnosticErrorTrap Trap(Diags); 9044 9045 // Copy-initialize the lambda object as needed to capture it. 9046 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9047 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9048 9049 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9050 Conv->getLocation(), 9051 Conv, DerefThis); 9052 9053 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9054 // behavior. Note that only the general conversion function does this 9055 // (since it's unusable otherwise); in the case where we inline the 9056 // block literal, it has block literal lifetime semantics. 9057 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9058 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9059 CK_CopyAndAutoreleaseBlockObject, 9060 BuildBlock.get(), 0, VK_RValue); 9061 9062 if (BuildBlock.isInvalid()) { 9063 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9064 Conv->setInvalidDecl(); 9065 return; 9066 } 9067 9068 // Create the return statement that returns the block from the conversion 9069 // function. 9070 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9071 if (Return.isInvalid()) { 9072 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9073 Conv->setInvalidDecl(); 9074 return; 9075 } 9076 9077 // Set the body of the conversion function. 9078 Stmt *ReturnS = Return.take(); 9079 Conv->setBody(new (Context) CompoundStmt(Context, &ReturnS, 1, 9080 Conv->getLocation(), 9081 Conv->getLocation())); 9082 9083 // We're done; notify the mutation listener, if any. 9084 if (ASTMutationListener *L = getASTMutationListener()) { 9085 L->CompletedImplicitDefinition(Conv); 9086 } 9087} 9088 9089/// \brief Determine whether the given list arguments contains exactly one 9090/// "real" (non-default) argument. 9091static bool hasOneRealArgument(MultiExprArg Args) { 9092 switch (Args.size()) { 9093 case 0: 9094 return false; 9095 9096 default: 9097 if (!Args[1]->isDefaultArgument()) 9098 return false; 9099 9100 // fall through 9101 case 1: 9102 return !Args[0]->isDefaultArgument(); 9103 } 9104 9105 return false; 9106} 9107 9108ExprResult 9109Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9110 CXXConstructorDecl *Constructor, 9111 MultiExprArg ExprArgs, 9112 bool HadMultipleCandidates, 9113 bool RequiresZeroInit, 9114 unsigned ConstructKind, 9115 SourceRange ParenRange) { 9116 bool Elidable = false; 9117 9118 // C++0x [class.copy]p34: 9119 // When certain criteria are met, an implementation is allowed to 9120 // omit the copy/move construction of a class object, even if the 9121 // copy/move constructor and/or destructor for the object have 9122 // side effects. [...] 9123 // - when a temporary class object that has not been bound to a 9124 // reference (12.2) would be copied/moved to a class object 9125 // with the same cv-unqualified type, the copy/move operation 9126 // can be omitted by constructing the temporary object 9127 // directly into the target of the omitted copy/move 9128 if (ConstructKind == CXXConstructExpr::CK_Complete && 9129 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9130 Expr *SubExpr = ExprArgs[0]; 9131 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9132 } 9133 9134 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9135 Elidable, ExprArgs, HadMultipleCandidates, 9136 RequiresZeroInit, ConstructKind, ParenRange); 9137} 9138 9139/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9140/// including handling of its default argument expressions. 9141ExprResult 9142Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9143 CXXConstructorDecl *Constructor, bool Elidable, 9144 MultiExprArg ExprArgs, 9145 bool HadMultipleCandidates, 9146 bool RequiresZeroInit, 9147 unsigned ConstructKind, 9148 SourceRange ParenRange) { 9149 MarkFunctionReferenced(ConstructLoc, Constructor); 9150 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9151 Constructor, Elidable, ExprArgs, 9152 HadMultipleCandidates, /*FIXME*/false, 9153 RequiresZeroInit, 9154 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9155 ParenRange)); 9156} 9157 9158bool Sema::InitializeVarWithConstructor(VarDecl *VD, 9159 CXXConstructorDecl *Constructor, 9160 MultiExprArg Exprs, 9161 bool HadMultipleCandidates) { 9162 // FIXME: Provide the correct paren SourceRange when available. 9163 ExprResult TempResult = 9164 BuildCXXConstructExpr(VD->getLocation(), VD->getType(), Constructor, 9165 Exprs, HadMultipleCandidates, false, 9166 CXXConstructExpr::CK_Complete, SourceRange()); 9167 if (TempResult.isInvalid()) 9168 return true; 9169 9170 Expr *Temp = TempResult.takeAs<Expr>(); 9171 CheckImplicitConversions(Temp, VD->getLocation()); 9172 MarkFunctionReferenced(VD->getLocation(), Constructor); 9173 Temp = MaybeCreateExprWithCleanups(Temp); 9174 VD->setInit(Temp); 9175 9176 return false; 9177} 9178 9179void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9180 if (VD->isInvalidDecl()) return; 9181 9182 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9183 if (ClassDecl->isInvalidDecl()) return; 9184 if (ClassDecl->hasIrrelevantDestructor()) return; 9185 if (ClassDecl->isDependentContext()) return; 9186 9187 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9188 MarkFunctionReferenced(VD->getLocation(), Destructor); 9189 CheckDestructorAccess(VD->getLocation(), Destructor, 9190 PDiag(diag::err_access_dtor_var) 9191 << VD->getDeclName() 9192 << VD->getType()); 9193 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9194 9195 if (!VD->hasGlobalStorage()) return; 9196 9197 // Emit warning for non-trivial dtor in global scope (a real global, 9198 // class-static, function-static). 9199 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9200 9201 // TODO: this should be re-enabled for static locals by !CXAAtExit 9202 if (!VD->isStaticLocal()) 9203 Diag(VD->getLocation(), diag::warn_global_destructor); 9204} 9205 9206/// \brief Given a constructor and the set of arguments provided for the 9207/// constructor, convert the arguments and add any required default arguments 9208/// to form a proper call to this constructor. 9209/// 9210/// \returns true if an error occurred, false otherwise. 9211bool 9212Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9213 MultiExprArg ArgsPtr, 9214 SourceLocation Loc, 9215 SmallVectorImpl<Expr*> &ConvertedArgs, 9216 bool AllowExplicit) { 9217 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9218 unsigned NumArgs = ArgsPtr.size(); 9219 Expr **Args = ArgsPtr.data(); 9220 9221 const FunctionProtoType *Proto 9222 = Constructor->getType()->getAs<FunctionProtoType>(); 9223 assert(Proto && "Constructor without a prototype?"); 9224 unsigned NumArgsInProto = Proto->getNumArgs(); 9225 9226 // If too few arguments are available, we'll fill in the rest with defaults. 9227 if (NumArgs < NumArgsInProto) 9228 ConvertedArgs.reserve(NumArgsInProto); 9229 else 9230 ConvertedArgs.reserve(NumArgs); 9231 9232 VariadicCallType CallType = 9233 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9234 SmallVector<Expr *, 8> AllArgs; 9235 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9236 Proto, 0, Args, NumArgs, AllArgs, 9237 CallType, AllowExplicit); 9238 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9239 9240 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9241 9242 CheckConstructorCall(Constructor, AllArgs.data(), AllArgs.size(), 9243 Proto, Loc); 9244 9245 return Invalid; 9246} 9247 9248static inline bool 9249CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9250 const FunctionDecl *FnDecl) { 9251 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9252 if (isa<NamespaceDecl>(DC)) { 9253 return SemaRef.Diag(FnDecl->getLocation(), 9254 diag::err_operator_new_delete_declared_in_namespace) 9255 << FnDecl->getDeclName(); 9256 } 9257 9258 if (isa<TranslationUnitDecl>(DC) && 9259 FnDecl->getStorageClass() == SC_Static) { 9260 return SemaRef.Diag(FnDecl->getLocation(), 9261 diag::err_operator_new_delete_declared_static) 9262 << FnDecl->getDeclName(); 9263 } 9264 9265 return false; 9266} 9267 9268static inline bool 9269CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9270 CanQualType ExpectedResultType, 9271 CanQualType ExpectedFirstParamType, 9272 unsigned DependentParamTypeDiag, 9273 unsigned InvalidParamTypeDiag) { 9274 QualType ResultType = 9275 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9276 9277 // Check that the result type is not dependent. 9278 if (ResultType->isDependentType()) 9279 return SemaRef.Diag(FnDecl->getLocation(), 9280 diag::err_operator_new_delete_dependent_result_type) 9281 << FnDecl->getDeclName() << ExpectedResultType; 9282 9283 // Check that the result type is what we expect. 9284 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9285 return SemaRef.Diag(FnDecl->getLocation(), 9286 diag::err_operator_new_delete_invalid_result_type) 9287 << FnDecl->getDeclName() << ExpectedResultType; 9288 9289 // A function template must have at least 2 parameters. 9290 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9291 return SemaRef.Diag(FnDecl->getLocation(), 9292 diag::err_operator_new_delete_template_too_few_parameters) 9293 << FnDecl->getDeclName(); 9294 9295 // The function decl must have at least 1 parameter. 9296 if (FnDecl->getNumParams() == 0) 9297 return SemaRef.Diag(FnDecl->getLocation(), 9298 diag::err_operator_new_delete_too_few_parameters) 9299 << FnDecl->getDeclName(); 9300 9301 // Check the first parameter type is not dependent. 9302 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9303 if (FirstParamType->isDependentType()) 9304 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9305 << FnDecl->getDeclName() << ExpectedFirstParamType; 9306 9307 // Check that the first parameter type is what we expect. 9308 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9309 ExpectedFirstParamType) 9310 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9311 << FnDecl->getDeclName() << ExpectedFirstParamType; 9312 9313 return false; 9314} 9315 9316static bool 9317CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9318 // C++ [basic.stc.dynamic.allocation]p1: 9319 // A program is ill-formed if an allocation function is declared in a 9320 // namespace scope other than global scope or declared static in global 9321 // scope. 9322 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9323 return true; 9324 9325 CanQualType SizeTy = 9326 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9327 9328 // C++ [basic.stc.dynamic.allocation]p1: 9329 // The return type shall be void*. The first parameter shall have type 9330 // std::size_t. 9331 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9332 SizeTy, 9333 diag::err_operator_new_dependent_param_type, 9334 diag::err_operator_new_param_type)) 9335 return true; 9336 9337 // C++ [basic.stc.dynamic.allocation]p1: 9338 // The first parameter shall not have an associated default argument. 9339 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9340 return SemaRef.Diag(FnDecl->getLocation(), 9341 diag::err_operator_new_default_arg) 9342 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9343 9344 return false; 9345} 9346 9347static bool 9348CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9349 // C++ [basic.stc.dynamic.deallocation]p1: 9350 // A program is ill-formed if deallocation functions are declared in a 9351 // namespace scope other than global scope or declared static in global 9352 // scope. 9353 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9354 return true; 9355 9356 // C++ [basic.stc.dynamic.deallocation]p2: 9357 // Each deallocation function shall return void and its first parameter 9358 // shall be void*. 9359 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9360 SemaRef.Context.VoidPtrTy, 9361 diag::err_operator_delete_dependent_param_type, 9362 diag::err_operator_delete_param_type)) 9363 return true; 9364 9365 return false; 9366} 9367 9368/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9369/// of this overloaded operator is well-formed. If so, returns false; 9370/// otherwise, emits appropriate diagnostics and returns true. 9371bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9372 assert(FnDecl && FnDecl->isOverloadedOperator() && 9373 "Expected an overloaded operator declaration"); 9374 9375 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9376 9377 // C++ [over.oper]p5: 9378 // The allocation and deallocation functions, operator new, 9379 // operator new[], operator delete and operator delete[], are 9380 // described completely in 3.7.3. The attributes and restrictions 9381 // found in the rest of this subclause do not apply to them unless 9382 // explicitly stated in 3.7.3. 9383 if (Op == OO_Delete || Op == OO_Array_Delete) 9384 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9385 9386 if (Op == OO_New || Op == OO_Array_New) 9387 return CheckOperatorNewDeclaration(*this, FnDecl); 9388 9389 // C++ [over.oper]p6: 9390 // An operator function shall either be a non-static member 9391 // function or be a non-member function and have at least one 9392 // parameter whose type is a class, a reference to a class, an 9393 // enumeration, or a reference to an enumeration. 9394 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9395 if (MethodDecl->isStatic()) 9396 return Diag(FnDecl->getLocation(), 9397 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9398 } else { 9399 bool ClassOrEnumParam = false; 9400 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9401 ParamEnd = FnDecl->param_end(); 9402 Param != ParamEnd; ++Param) { 9403 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9404 if (ParamType->isDependentType() || ParamType->isRecordType() || 9405 ParamType->isEnumeralType()) { 9406 ClassOrEnumParam = true; 9407 break; 9408 } 9409 } 9410 9411 if (!ClassOrEnumParam) 9412 return Diag(FnDecl->getLocation(), 9413 diag::err_operator_overload_needs_class_or_enum) 9414 << FnDecl->getDeclName(); 9415 } 9416 9417 // C++ [over.oper]p8: 9418 // An operator function cannot have default arguments (8.3.6), 9419 // except where explicitly stated below. 9420 // 9421 // Only the function-call operator allows default arguments 9422 // (C++ [over.call]p1). 9423 if (Op != OO_Call) { 9424 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9425 Param != FnDecl->param_end(); ++Param) { 9426 if ((*Param)->hasDefaultArg()) 9427 return Diag((*Param)->getLocation(), 9428 diag::err_operator_overload_default_arg) 9429 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9430 } 9431 } 9432 9433 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9434 { false, false, false } 9435#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9436 , { Unary, Binary, MemberOnly } 9437#include "clang/Basic/OperatorKinds.def" 9438 }; 9439 9440 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9441 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9442 bool MustBeMemberOperator = OperatorUses[Op][2]; 9443 9444 // C++ [over.oper]p8: 9445 // [...] Operator functions cannot have more or fewer parameters 9446 // than the number required for the corresponding operator, as 9447 // described in the rest of this subclause. 9448 unsigned NumParams = FnDecl->getNumParams() 9449 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9450 if (Op != OO_Call && 9451 ((NumParams == 1 && !CanBeUnaryOperator) || 9452 (NumParams == 2 && !CanBeBinaryOperator) || 9453 (NumParams < 1) || (NumParams > 2))) { 9454 // We have the wrong number of parameters. 9455 unsigned ErrorKind; 9456 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9457 ErrorKind = 2; // 2 -> unary or binary. 9458 } else if (CanBeUnaryOperator) { 9459 ErrorKind = 0; // 0 -> unary 9460 } else { 9461 assert(CanBeBinaryOperator && 9462 "All non-call overloaded operators are unary or binary!"); 9463 ErrorKind = 1; // 1 -> binary 9464 } 9465 9466 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9467 << FnDecl->getDeclName() << NumParams << ErrorKind; 9468 } 9469 9470 // Overloaded operators other than operator() cannot be variadic. 9471 if (Op != OO_Call && 9472 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9473 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9474 << FnDecl->getDeclName(); 9475 } 9476 9477 // Some operators must be non-static member functions. 9478 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9479 return Diag(FnDecl->getLocation(), 9480 diag::err_operator_overload_must_be_member) 9481 << FnDecl->getDeclName(); 9482 } 9483 9484 // C++ [over.inc]p1: 9485 // The user-defined function called operator++ implements the 9486 // prefix and postfix ++ operator. If this function is a member 9487 // function with no parameters, or a non-member function with one 9488 // parameter of class or enumeration type, it defines the prefix 9489 // increment operator ++ for objects of that type. If the function 9490 // is a member function with one parameter (which shall be of type 9491 // int) or a non-member function with two parameters (the second 9492 // of which shall be of type int), it defines the postfix 9493 // increment operator ++ for objects of that type. 9494 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 9495 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 9496 bool ParamIsInt = false; 9497 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 9498 ParamIsInt = BT->getKind() == BuiltinType::Int; 9499 9500 if (!ParamIsInt) 9501 return Diag(LastParam->getLocation(), 9502 diag::err_operator_overload_post_incdec_must_be_int) 9503 << LastParam->getType() << (Op == OO_MinusMinus); 9504 } 9505 9506 return false; 9507} 9508 9509/// CheckLiteralOperatorDeclaration - Check whether the declaration 9510/// of this literal operator function is well-formed. If so, returns 9511/// false; otherwise, emits appropriate diagnostics and returns true. 9512bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 9513 if (isa<CXXMethodDecl>(FnDecl)) { 9514 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 9515 << FnDecl->getDeclName(); 9516 return true; 9517 } 9518 9519 if (FnDecl->isExternC()) { 9520 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 9521 return true; 9522 } 9523 9524 bool Valid = false; 9525 9526 // This might be the definition of a literal operator template. 9527 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 9528 // This might be a specialization of a literal operator template. 9529 if (!TpDecl) 9530 TpDecl = FnDecl->getPrimaryTemplate(); 9531 9532 // template <char...> type operator "" name() is the only valid template 9533 // signature, and the only valid signature with no parameters. 9534 if (TpDecl) { 9535 if (FnDecl->param_size() == 0) { 9536 // Must have only one template parameter 9537 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 9538 if (Params->size() == 1) { 9539 NonTypeTemplateParmDecl *PmDecl = 9540 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 9541 9542 // The template parameter must be a char parameter pack. 9543 if (PmDecl && PmDecl->isTemplateParameterPack() && 9544 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 9545 Valid = true; 9546 } 9547 } 9548 } else if (FnDecl->param_size()) { 9549 // Check the first parameter 9550 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9551 9552 QualType T = (*Param)->getType().getUnqualifiedType(); 9553 9554 // unsigned long long int, long double, and any character type are allowed 9555 // as the only parameters. 9556 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 9557 Context.hasSameType(T, Context.LongDoubleTy) || 9558 Context.hasSameType(T, Context.CharTy) || 9559 Context.hasSameType(T, Context.WCharTy) || 9560 Context.hasSameType(T, Context.Char16Ty) || 9561 Context.hasSameType(T, Context.Char32Ty)) { 9562 if (++Param == FnDecl->param_end()) 9563 Valid = true; 9564 goto FinishedParams; 9565 } 9566 9567 // Otherwise it must be a pointer to const; let's strip those qualifiers. 9568 const PointerType *PT = T->getAs<PointerType>(); 9569 if (!PT) 9570 goto FinishedParams; 9571 T = PT->getPointeeType(); 9572 if (!T.isConstQualified() || T.isVolatileQualified()) 9573 goto FinishedParams; 9574 T = T.getUnqualifiedType(); 9575 9576 // Move on to the second parameter; 9577 ++Param; 9578 9579 // If there is no second parameter, the first must be a const char * 9580 if (Param == FnDecl->param_end()) { 9581 if (Context.hasSameType(T, Context.CharTy)) 9582 Valid = true; 9583 goto FinishedParams; 9584 } 9585 9586 // const char *, const wchar_t*, const char16_t*, and const char32_t* 9587 // are allowed as the first parameter to a two-parameter function 9588 if (!(Context.hasSameType(T, Context.CharTy) || 9589 Context.hasSameType(T, Context.WCharTy) || 9590 Context.hasSameType(T, Context.Char16Ty) || 9591 Context.hasSameType(T, Context.Char32Ty))) 9592 goto FinishedParams; 9593 9594 // The second and final parameter must be an std::size_t 9595 T = (*Param)->getType().getUnqualifiedType(); 9596 if (Context.hasSameType(T, Context.getSizeType()) && 9597 ++Param == FnDecl->param_end()) 9598 Valid = true; 9599 } 9600 9601 // FIXME: This diagnostic is absolutely terrible. 9602FinishedParams: 9603 if (!Valid) { 9604 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 9605 << FnDecl->getDeclName(); 9606 return true; 9607 } 9608 9609 // A parameter-declaration-clause containing a default argument is not 9610 // equivalent to any of the permitted forms. 9611 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9612 ParamEnd = FnDecl->param_end(); 9613 Param != ParamEnd; ++Param) { 9614 if ((*Param)->hasDefaultArg()) { 9615 Diag((*Param)->getDefaultArgRange().getBegin(), 9616 diag::err_literal_operator_default_argument) 9617 << (*Param)->getDefaultArgRange(); 9618 break; 9619 } 9620 } 9621 9622 StringRef LiteralName 9623 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 9624 if (LiteralName[0] != '_') { 9625 // C++11 [usrlit.suffix]p1: 9626 // Literal suffix identifiers that do not start with an underscore 9627 // are reserved for future standardization. 9628 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 9629 } 9630 9631 return false; 9632} 9633 9634/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 9635/// linkage specification, including the language and (if present) 9636/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 9637/// the location of the language string literal, which is provided 9638/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 9639/// the '{' brace. Otherwise, this linkage specification does not 9640/// have any braces. 9641Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 9642 SourceLocation LangLoc, 9643 StringRef Lang, 9644 SourceLocation LBraceLoc) { 9645 LinkageSpecDecl::LanguageIDs Language; 9646 if (Lang == "\"C\"") 9647 Language = LinkageSpecDecl::lang_c; 9648 else if (Lang == "\"C++\"") 9649 Language = LinkageSpecDecl::lang_cxx; 9650 else { 9651 Diag(LangLoc, diag::err_bad_language); 9652 return 0; 9653 } 9654 9655 // FIXME: Add all the various semantics of linkage specifications 9656 9657 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 9658 ExternLoc, LangLoc, Language); 9659 CurContext->addDecl(D); 9660 PushDeclContext(S, D); 9661 return D; 9662} 9663 9664/// ActOnFinishLinkageSpecification - Complete the definition of 9665/// the C++ linkage specification LinkageSpec. If RBraceLoc is 9666/// valid, it's the position of the closing '}' brace in a linkage 9667/// specification that uses braces. 9668Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 9669 Decl *LinkageSpec, 9670 SourceLocation RBraceLoc) { 9671 if (LinkageSpec) { 9672 if (RBraceLoc.isValid()) { 9673 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 9674 LSDecl->setRBraceLoc(RBraceLoc); 9675 } 9676 PopDeclContext(); 9677 } 9678 return LinkageSpec; 9679} 9680 9681/// \brief Perform semantic analysis for the variable declaration that 9682/// occurs within a C++ catch clause, returning the newly-created 9683/// variable. 9684VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 9685 TypeSourceInfo *TInfo, 9686 SourceLocation StartLoc, 9687 SourceLocation Loc, 9688 IdentifierInfo *Name) { 9689 bool Invalid = false; 9690 QualType ExDeclType = TInfo->getType(); 9691 9692 // Arrays and functions decay. 9693 if (ExDeclType->isArrayType()) 9694 ExDeclType = Context.getArrayDecayedType(ExDeclType); 9695 else if (ExDeclType->isFunctionType()) 9696 ExDeclType = Context.getPointerType(ExDeclType); 9697 9698 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 9699 // The exception-declaration shall not denote a pointer or reference to an 9700 // incomplete type, other than [cv] void*. 9701 // N2844 forbids rvalue references. 9702 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 9703 Diag(Loc, diag::err_catch_rvalue_ref); 9704 Invalid = true; 9705 } 9706 9707 QualType BaseType = ExDeclType; 9708 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 9709 unsigned DK = diag::err_catch_incomplete; 9710 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 9711 BaseType = Ptr->getPointeeType(); 9712 Mode = 1; 9713 DK = diag::err_catch_incomplete_ptr; 9714 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 9715 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 9716 BaseType = Ref->getPointeeType(); 9717 Mode = 2; 9718 DK = diag::err_catch_incomplete_ref; 9719 } 9720 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 9721 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 9722 Invalid = true; 9723 9724 if (!Invalid && !ExDeclType->isDependentType() && 9725 RequireNonAbstractType(Loc, ExDeclType, 9726 diag::err_abstract_type_in_decl, 9727 AbstractVariableType)) 9728 Invalid = true; 9729 9730 // Only the non-fragile NeXT runtime currently supports C++ catches 9731 // of ObjC types, and no runtime supports catching ObjC types by value. 9732 if (!Invalid && getLangOpts().ObjC1) { 9733 QualType T = ExDeclType; 9734 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 9735 T = RT->getPointeeType(); 9736 9737 if (T->isObjCObjectType()) { 9738 Diag(Loc, diag::err_objc_object_catch); 9739 Invalid = true; 9740 } else if (T->isObjCObjectPointerType()) { 9741 // FIXME: should this be a test for macosx-fragile specifically? 9742 if (getLangOpts().ObjCRuntime.isFragile()) 9743 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 9744 } 9745 } 9746 9747 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 9748 ExDeclType, TInfo, SC_None, SC_None); 9749 ExDecl->setExceptionVariable(true); 9750 9751 // In ARC, infer 'retaining' for variables of retainable type. 9752 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 9753 Invalid = true; 9754 9755 if (!Invalid && !ExDeclType->isDependentType()) { 9756 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 9757 // C++ [except.handle]p16: 9758 // The object declared in an exception-declaration or, if the 9759 // exception-declaration does not specify a name, a temporary (12.2) is 9760 // copy-initialized (8.5) from the exception object. [...] 9761 // The object is destroyed when the handler exits, after the destruction 9762 // of any automatic objects initialized within the handler. 9763 // 9764 // We just pretend to initialize the object with itself, then make sure 9765 // it can be destroyed later. 9766 QualType initType = ExDeclType; 9767 9768 InitializedEntity entity = 9769 InitializedEntity::InitializeVariable(ExDecl); 9770 InitializationKind initKind = 9771 InitializationKind::CreateCopy(Loc, SourceLocation()); 9772 9773 Expr *opaqueValue = 9774 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 9775 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 9776 ExprResult result = sequence.Perform(*this, entity, initKind, 9777 MultiExprArg(&opaqueValue, 1)); 9778 if (result.isInvalid()) 9779 Invalid = true; 9780 else { 9781 // If the constructor used was non-trivial, set this as the 9782 // "initializer". 9783 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 9784 if (!construct->getConstructor()->isTrivial()) { 9785 Expr *init = MaybeCreateExprWithCleanups(construct); 9786 ExDecl->setInit(init); 9787 } 9788 9789 // And make sure it's destructable. 9790 FinalizeVarWithDestructor(ExDecl, recordType); 9791 } 9792 } 9793 } 9794 9795 if (Invalid) 9796 ExDecl->setInvalidDecl(); 9797 9798 return ExDecl; 9799} 9800 9801/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 9802/// handler. 9803Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 9804 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 9805 bool Invalid = D.isInvalidType(); 9806 9807 // Check for unexpanded parameter packs. 9808 if (TInfo && DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 9809 UPPC_ExceptionType)) { 9810 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 9811 D.getIdentifierLoc()); 9812 Invalid = true; 9813 } 9814 9815 IdentifierInfo *II = D.getIdentifier(); 9816 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 9817 LookupOrdinaryName, 9818 ForRedeclaration)) { 9819 // The scope should be freshly made just for us. There is just no way 9820 // it contains any previous declaration. 9821 assert(!S->isDeclScope(PrevDecl)); 9822 if (PrevDecl->isTemplateParameter()) { 9823 // Maybe we will complain about the shadowed template parameter. 9824 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 9825 PrevDecl = 0; 9826 } 9827 } 9828 9829 if (D.getCXXScopeSpec().isSet() && !Invalid) { 9830 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 9831 << D.getCXXScopeSpec().getRange(); 9832 Invalid = true; 9833 } 9834 9835 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 9836 D.getLocStart(), 9837 D.getIdentifierLoc(), 9838 D.getIdentifier()); 9839 if (Invalid) 9840 ExDecl->setInvalidDecl(); 9841 9842 // Add the exception declaration into this scope. 9843 if (II) 9844 PushOnScopeChains(ExDecl, S); 9845 else 9846 CurContext->addDecl(ExDecl); 9847 9848 ProcessDeclAttributes(S, ExDecl, D); 9849 return ExDecl; 9850} 9851 9852Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9853 Expr *AssertExpr, 9854 Expr *AssertMessageExpr, 9855 SourceLocation RParenLoc) { 9856 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 9857 9858 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 9859 return 0; 9860 9861 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 9862 AssertMessage, RParenLoc, false); 9863} 9864 9865Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 9866 Expr *AssertExpr, 9867 StringLiteral *AssertMessage, 9868 SourceLocation RParenLoc, 9869 bool Failed) { 9870 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 9871 !Failed) { 9872 // In a static_assert-declaration, the constant-expression shall be a 9873 // constant expression that can be contextually converted to bool. 9874 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 9875 if (Converted.isInvalid()) 9876 Failed = true; 9877 9878 llvm::APSInt Cond; 9879 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 9880 diag::err_static_assert_expression_is_not_constant, 9881 /*AllowFold=*/false).isInvalid()) 9882 Failed = true; 9883 9884 if (!Failed && !Cond) { 9885 llvm::SmallString<256> MsgBuffer; 9886 llvm::raw_svector_ostream Msg(MsgBuffer); 9887 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 9888 Diag(StaticAssertLoc, diag::err_static_assert_failed) 9889 << Msg.str() << AssertExpr->getSourceRange(); 9890 Failed = true; 9891 } 9892 } 9893 9894 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 9895 AssertExpr, AssertMessage, RParenLoc, 9896 Failed); 9897 9898 CurContext->addDecl(Decl); 9899 return Decl; 9900} 9901 9902/// \brief Perform semantic analysis of the given friend type declaration. 9903/// 9904/// \returns A friend declaration that. 9905FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 9906 SourceLocation FriendLoc, 9907 TypeSourceInfo *TSInfo) { 9908 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 9909 9910 QualType T = TSInfo->getType(); 9911 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 9912 9913 // C++03 [class.friend]p2: 9914 // An elaborated-type-specifier shall be used in a friend declaration 9915 // for a class.* 9916 // 9917 // * The class-key of the elaborated-type-specifier is required. 9918 if (!ActiveTemplateInstantiations.empty()) { 9919 // Do not complain about the form of friend template types during 9920 // template instantiation; we will already have complained when the 9921 // template was declared. 9922 } else if (!T->isElaboratedTypeSpecifier()) { 9923 // If we evaluated the type to a record type, suggest putting 9924 // a tag in front. 9925 if (const RecordType *RT = T->getAs<RecordType>()) { 9926 RecordDecl *RD = RT->getDecl(); 9927 9928 std::string InsertionText = std::string(" ") + RD->getKindName(); 9929 9930 Diag(TypeRange.getBegin(), 9931 getLangOpts().CPlusPlus0x ? 9932 diag::warn_cxx98_compat_unelaborated_friend_type : 9933 diag::ext_unelaborated_friend_type) 9934 << (unsigned) RD->getTagKind() 9935 << T 9936 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 9937 InsertionText); 9938 } else { 9939 Diag(FriendLoc, 9940 getLangOpts().CPlusPlus0x ? 9941 diag::warn_cxx98_compat_nonclass_type_friend : 9942 diag::ext_nonclass_type_friend) 9943 << T 9944 << TypeRange; 9945 } 9946 } else if (T->getAs<EnumType>()) { 9947 Diag(FriendLoc, 9948 getLangOpts().CPlusPlus0x ? 9949 diag::warn_cxx98_compat_enum_friend : 9950 diag::ext_enum_friend) 9951 << T 9952 << TypeRange; 9953 } 9954 9955 // C++11 [class.friend]p3: 9956 // A friend declaration that does not declare a function shall have one 9957 // of the following forms: 9958 // friend elaborated-type-specifier ; 9959 // friend simple-type-specifier ; 9960 // friend typename-specifier ; 9961 if (getLangOpts().CPlusPlus0x && LocStart != FriendLoc) 9962 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 9963 9964 // If the type specifier in a friend declaration designates a (possibly 9965 // cv-qualified) class type, that class is declared as a friend; otherwise, 9966 // the friend declaration is ignored. 9967 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 9968} 9969 9970/// Handle a friend tag declaration where the scope specifier was 9971/// templated. 9972Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 9973 unsigned TagSpec, SourceLocation TagLoc, 9974 CXXScopeSpec &SS, 9975 IdentifierInfo *Name, SourceLocation NameLoc, 9976 AttributeList *Attr, 9977 MultiTemplateParamsArg TempParamLists) { 9978 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 9979 9980 bool isExplicitSpecialization = false; 9981 bool Invalid = false; 9982 9983 if (TemplateParameterList *TemplateParams 9984 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 9985 TempParamLists.data(), 9986 TempParamLists.size(), 9987 /*friend*/ true, 9988 isExplicitSpecialization, 9989 Invalid)) { 9990 if (TemplateParams->size() > 0) { 9991 // This is a declaration of a class template. 9992 if (Invalid) 9993 return 0; 9994 9995 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 9996 SS, Name, NameLoc, Attr, 9997 TemplateParams, AS_public, 9998 /*ModulePrivateLoc=*/SourceLocation(), 9999 TempParamLists.size() - 1, 10000 TempParamLists.data()).take(); 10001 } else { 10002 // The "template<>" header is extraneous. 10003 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10004 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10005 isExplicitSpecialization = true; 10006 } 10007 } 10008 10009 if (Invalid) return 0; 10010 10011 bool isAllExplicitSpecializations = true; 10012 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10013 if (TempParamLists[I]->size()) { 10014 isAllExplicitSpecializations = false; 10015 break; 10016 } 10017 } 10018 10019 // FIXME: don't ignore attributes. 10020 10021 // If it's explicit specializations all the way down, just forget 10022 // about the template header and build an appropriate non-templated 10023 // friend. TODO: for source fidelity, remember the headers. 10024 if (isAllExplicitSpecializations) { 10025 if (SS.isEmpty()) { 10026 bool Owned = false; 10027 bool IsDependent = false; 10028 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10029 Attr, AS_public, 10030 /*ModulePrivateLoc=*/SourceLocation(), 10031 MultiTemplateParamsArg(), Owned, IsDependent, 10032 /*ScopedEnumKWLoc=*/SourceLocation(), 10033 /*ScopedEnumUsesClassTag=*/false, 10034 /*UnderlyingType=*/TypeResult()); 10035 } 10036 10037 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10038 ElaboratedTypeKeyword Keyword 10039 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10040 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10041 *Name, NameLoc); 10042 if (T.isNull()) 10043 return 0; 10044 10045 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10046 if (isa<DependentNameType>(T)) { 10047 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10048 TL.setElaboratedKeywordLoc(TagLoc); 10049 TL.setQualifierLoc(QualifierLoc); 10050 TL.setNameLoc(NameLoc); 10051 } else { 10052 ElaboratedTypeLoc TL = cast<ElaboratedTypeLoc>(TSI->getTypeLoc()); 10053 TL.setElaboratedKeywordLoc(TagLoc); 10054 TL.setQualifierLoc(QualifierLoc); 10055 cast<TypeSpecTypeLoc>(TL.getNamedTypeLoc()).setNameLoc(NameLoc); 10056 } 10057 10058 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10059 TSI, FriendLoc); 10060 Friend->setAccess(AS_public); 10061 CurContext->addDecl(Friend); 10062 return Friend; 10063 } 10064 10065 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10066 10067 10068 10069 // Handle the case of a templated-scope friend class. e.g. 10070 // template <class T> class A<T>::B; 10071 // FIXME: we don't support these right now. 10072 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10073 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10074 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10075 DependentNameTypeLoc TL = cast<DependentNameTypeLoc>(TSI->getTypeLoc()); 10076 TL.setElaboratedKeywordLoc(TagLoc); 10077 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10078 TL.setNameLoc(NameLoc); 10079 10080 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10081 TSI, FriendLoc); 10082 Friend->setAccess(AS_public); 10083 Friend->setUnsupportedFriend(true); 10084 CurContext->addDecl(Friend); 10085 return Friend; 10086} 10087 10088 10089/// Handle a friend type declaration. This works in tandem with 10090/// ActOnTag. 10091/// 10092/// Notes on friend class templates: 10093/// 10094/// We generally treat friend class declarations as if they were 10095/// declaring a class. So, for example, the elaborated type specifier 10096/// in a friend declaration is required to obey the restrictions of a 10097/// class-head (i.e. no typedefs in the scope chain), template 10098/// parameters are required to match up with simple template-ids, &c. 10099/// However, unlike when declaring a template specialization, it's 10100/// okay to refer to a template specialization without an empty 10101/// template parameter declaration, e.g. 10102/// friend class A<T>::B<unsigned>; 10103/// We permit this as a special case; if there are any template 10104/// parameters present at all, require proper matching, i.e. 10105/// template <> template \<class T> friend class A<int>::B; 10106Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10107 MultiTemplateParamsArg TempParams) { 10108 SourceLocation Loc = DS.getLocStart(); 10109 10110 assert(DS.isFriendSpecified()); 10111 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10112 10113 // Try to convert the decl specifier to a type. This works for 10114 // friend templates because ActOnTag never produces a ClassTemplateDecl 10115 // for a TUK_Friend. 10116 Declarator TheDeclarator(DS, Declarator::MemberContext); 10117 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10118 QualType T = TSI->getType(); 10119 if (TheDeclarator.isInvalidType()) 10120 return 0; 10121 10122 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10123 return 0; 10124 10125 // This is definitely an error in C++98. It's probably meant to 10126 // be forbidden in C++0x, too, but the specification is just 10127 // poorly written. 10128 // 10129 // The problem is with declarations like the following: 10130 // template <T> friend A<T>::foo; 10131 // where deciding whether a class C is a friend or not now hinges 10132 // on whether there exists an instantiation of A that causes 10133 // 'foo' to equal C. There are restrictions on class-heads 10134 // (which we declare (by fiat) elaborated friend declarations to 10135 // be) that makes this tractable. 10136 // 10137 // FIXME: handle "template <> friend class A<T>;", which 10138 // is possibly well-formed? Who even knows? 10139 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10140 Diag(Loc, diag::err_tagless_friend_type_template) 10141 << DS.getSourceRange(); 10142 return 0; 10143 } 10144 10145 // C++98 [class.friend]p1: A friend of a class is a function 10146 // or class that is not a member of the class . . . 10147 // This is fixed in DR77, which just barely didn't make the C++03 10148 // deadline. It's also a very silly restriction that seriously 10149 // affects inner classes and which nobody else seems to implement; 10150 // thus we never diagnose it, not even in -pedantic. 10151 // 10152 // But note that we could warn about it: it's always useless to 10153 // friend one of your own members (it's not, however, worthless to 10154 // friend a member of an arbitrary specialization of your template). 10155 10156 Decl *D; 10157 if (unsigned NumTempParamLists = TempParams.size()) 10158 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10159 NumTempParamLists, 10160 TempParams.data(), 10161 TSI, 10162 DS.getFriendSpecLoc()); 10163 else 10164 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10165 10166 if (!D) 10167 return 0; 10168 10169 D->setAccess(AS_public); 10170 CurContext->addDecl(D); 10171 10172 return D; 10173} 10174 10175Decl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10176 MultiTemplateParamsArg TemplateParams) { 10177 const DeclSpec &DS = D.getDeclSpec(); 10178 10179 assert(DS.isFriendSpecified()); 10180 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10181 10182 SourceLocation Loc = D.getIdentifierLoc(); 10183 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10184 10185 // C++ [class.friend]p1 10186 // A friend of a class is a function or class.... 10187 // Note that this sees through typedefs, which is intended. 10188 // It *doesn't* see through dependent types, which is correct 10189 // according to [temp.arg.type]p3: 10190 // If a declaration acquires a function type through a 10191 // type dependent on a template-parameter and this causes 10192 // a declaration that does not use the syntactic form of a 10193 // function declarator to have a function type, the program 10194 // is ill-formed. 10195 if (!TInfo->getType()->isFunctionType()) { 10196 Diag(Loc, diag::err_unexpected_friend); 10197 10198 // It might be worthwhile to try to recover by creating an 10199 // appropriate declaration. 10200 return 0; 10201 } 10202 10203 // C++ [namespace.memdef]p3 10204 // - If a friend declaration in a non-local class first declares a 10205 // class or function, the friend class or function is a member 10206 // of the innermost enclosing namespace. 10207 // - The name of the friend is not found by simple name lookup 10208 // until a matching declaration is provided in that namespace 10209 // scope (either before or after the class declaration granting 10210 // friendship). 10211 // - If a friend function is called, its name may be found by the 10212 // name lookup that considers functions from namespaces and 10213 // classes associated with the types of the function arguments. 10214 // - When looking for a prior declaration of a class or a function 10215 // declared as a friend, scopes outside the innermost enclosing 10216 // namespace scope are not considered. 10217 10218 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10219 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10220 DeclarationName Name = NameInfo.getName(); 10221 assert(Name); 10222 10223 // Check for unexpanded parameter packs. 10224 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10225 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10226 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10227 return 0; 10228 10229 // The context we found the declaration in, or in which we should 10230 // create the declaration. 10231 DeclContext *DC; 10232 Scope *DCScope = S; 10233 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10234 ForRedeclaration); 10235 10236 // FIXME: there are different rules in local classes 10237 10238 // There are four cases here. 10239 // - There's no scope specifier, in which case we just go to the 10240 // appropriate scope and look for a function or function template 10241 // there as appropriate. 10242 // Recover from invalid scope qualifiers as if they just weren't there. 10243 if (SS.isInvalid() || !SS.isSet()) { 10244 // C++0x [namespace.memdef]p3: 10245 // If the name in a friend declaration is neither qualified nor 10246 // a template-id and the declaration is a function or an 10247 // elaborated-type-specifier, the lookup to determine whether 10248 // the entity has been previously declared shall not consider 10249 // any scopes outside the innermost enclosing namespace. 10250 // C++0x [class.friend]p11: 10251 // If a friend declaration appears in a local class and the name 10252 // specified is an unqualified name, a prior declaration is 10253 // looked up without considering scopes that are outside the 10254 // innermost enclosing non-class scope. For a friend function 10255 // declaration, if there is no prior declaration, the program is 10256 // ill-formed. 10257 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10258 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10259 10260 // Find the appropriate context according to the above. 10261 DC = CurContext; 10262 while (true) { 10263 // Skip class contexts. If someone can cite chapter and verse 10264 // for this behavior, that would be nice --- it's what GCC and 10265 // EDG do, and it seems like a reasonable intent, but the spec 10266 // really only says that checks for unqualified existing 10267 // declarations should stop at the nearest enclosing namespace, 10268 // not that they should only consider the nearest enclosing 10269 // namespace. 10270 while (DC->isRecord() || DC->isTransparentContext()) 10271 DC = DC->getParent(); 10272 10273 LookupQualifiedName(Previous, DC); 10274 10275 // TODO: decide what we think about using declarations. 10276 if (isLocal || !Previous.empty()) 10277 break; 10278 10279 if (isTemplateId) { 10280 if (isa<TranslationUnitDecl>(DC)) break; 10281 } else { 10282 if (DC->isFileContext()) break; 10283 } 10284 DC = DC->getParent(); 10285 } 10286 10287 // C++ [class.friend]p1: A friend of a class is a function or 10288 // class that is not a member of the class . . . 10289 // C++11 changes this for both friend types and functions. 10290 // Most C++ 98 compilers do seem to give an error here, so 10291 // we do, too. 10292 if (!Previous.empty() && DC->Equals(CurContext)) 10293 Diag(DS.getFriendSpecLoc(), 10294 getLangOpts().CPlusPlus0x ? 10295 diag::warn_cxx98_compat_friend_is_member : 10296 diag::err_friend_is_member); 10297 10298 DCScope = getScopeForDeclContext(S, DC); 10299 10300 // C++ [class.friend]p6: 10301 // A function can be defined in a friend declaration of a class if and 10302 // only if the class is a non-local class (9.8), the function name is 10303 // unqualified, and the function has namespace scope. 10304 if (isLocal && D.isFunctionDefinition()) { 10305 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10306 } 10307 10308 // - There's a non-dependent scope specifier, in which case we 10309 // compute it and do a previous lookup there for a function 10310 // or function template. 10311 } else if (!SS.getScopeRep()->isDependent()) { 10312 DC = computeDeclContext(SS); 10313 if (!DC) return 0; 10314 10315 if (RequireCompleteDeclContext(SS, DC)) return 0; 10316 10317 LookupQualifiedName(Previous, DC); 10318 10319 // Ignore things found implicitly in the wrong scope. 10320 // TODO: better diagnostics for this case. Suggesting the right 10321 // qualified scope would be nice... 10322 LookupResult::Filter F = Previous.makeFilter(); 10323 while (F.hasNext()) { 10324 NamedDecl *D = F.next(); 10325 if (!DC->InEnclosingNamespaceSetOf( 10326 D->getDeclContext()->getRedeclContext())) 10327 F.erase(); 10328 } 10329 F.done(); 10330 10331 if (Previous.empty()) { 10332 D.setInvalidType(); 10333 Diag(Loc, diag::err_qualified_friend_not_found) 10334 << Name << TInfo->getType(); 10335 return 0; 10336 } 10337 10338 // C++ [class.friend]p1: A friend of a class is a function or 10339 // class that is not a member of the class . . . 10340 if (DC->Equals(CurContext)) 10341 Diag(DS.getFriendSpecLoc(), 10342 getLangOpts().CPlusPlus0x ? 10343 diag::warn_cxx98_compat_friend_is_member : 10344 diag::err_friend_is_member); 10345 10346 if (D.isFunctionDefinition()) { 10347 // C++ [class.friend]p6: 10348 // A function can be defined in a friend declaration of a class if and 10349 // only if the class is a non-local class (9.8), the function name is 10350 // unqualified, and the function has namespace scope. 10351 SemaDiagnosticBuilder DB 10352 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10353 10354 DB << SS.getScopeRep(); 10355 if (DC->isFileContext()) 10356 DB << FixItHint::CreateRemoval(SS.getRange()); 10357 SS.clear(); 10358 } 10359 10360 // - There's a scope specifier that does not match any template 10361 // parameter lists, in which case we use some arbitrary context, 10362 // create a method or method template, and wait for instantiation. 10363 // - There's a scope specifier that does match some template 10364 // parameter lists, which we don't handle right now. 10365 } else { 10366 if (D.isFunctionDefinition()) { 10367 // C++ [class.friend]p6: 10368 // A function can be defined in a friend declaration of a class if and 10369 // only if the class is a non-local class (9.8), the function name is 10370 // unqualified, and the function has namespace scope. 10371 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10372 << SS.getScopeRep(); 10373 } 10374 10375 DC = CurContext; 10376 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10377 } 10378 10379 if (!DC->isRecord()) { 10380 // This implies that it has to be an operator or function. 10381 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10382 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10383 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10384 Diag(Loc, diag::err_introducing_special_friend) << 10385 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10386 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10387 return 0; 10388 } 10389 } 10390 10391 // FIXME: This is an egregious hack to cope with cases where the scope stack 10392 // does not contain the declaration context, i.e., in an out-of-line 10393 // definition of a class. 10394 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10395 if (!DCScope) { 10396 FakeDCScope.setEntity(DC); 10397 DCScope = &FakeDCScope; 10398 } 10399 10400 bool AddToScope = true; 10401 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10402 TemplateParams, AddToScope); 10403 if (!ND) return 0; 10404 10405 assert(ND->getDeclContext() == DC); 10406 assert(ND->getLexicalDeclContext() == CurContext); 10407 10408 // Add the function declaration to the appropriate lookup tables, 10409 // adjusting the redeclarations list as necessary. We don't 10410 // want to do this yet if the friending class is dependent. 10411 // 10412 // Also update the scope-based lookup if the target context's 10413 // lookup context is in lexical scope. 10414 if (!CurContext->isDependentContext()) { 10415 DC = DC->getRedeclContext(); 10416 DC->makeDeclVisibleInContext(ND); 10417 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10418 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10419 } 10420 10421 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10422 D.getIdentifierLoc(), ND, 10423 DS.getFriendSpecLoc()); 10424 FrD->setAccess(AS_public); 10425 CurContext->addDecl(FrD); 10426 10427 if (ND->isInvalidDecl()) { 10428 FrD->setInvalidDecl(); 10429 } else { 10430 if (DC->isRecord()) CheckFriendAccess(ND); 10431 10432 FunctionDecl *FD; 10433 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10434 FD = FTD->getTemplatedDecl(); 10435 else 10436 FD = cast<FunctionDecl>(ND); 10437 10438 // Mark templated-scope function declarations as unsupported. 10439 if (FD->getNumTemplateParameterLists()) 10440 FrD->setUnsupportedFriend(true); 10441 } 10442 10443 return ND; 10444} 10445 10446void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10447 AdjustDeclIfTemplate(Dcl); 10448 10449 FunctionDecl *Fn = dyn_cast<FunctionDecl>(Dcl); 10450 if (!Fn) { 10451 Diag(DelLoc, diag::err_deleted_non_function); 10452 return; 10453 } 10454 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10455 // Don't consider the implicit declaration we generate for explicit 10456 // specializations. FIXME: Do not generate these implicit declarations. 10457 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10458 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10459 Diag(DelLoc, diag::err_deleted_decl_not_first); 10460 Diag(Prev->getLocation(), diag::note_previous_declaration); 10461 } 10462 // If the declaration wasn't the first, we delete the function anyway for 10463 // recovery. 10464 } 10465 Fn->setDeletedAsWritten(); 10466 10467 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10468 if (!MD) 10469 return; 10470 10471 // A deleted special member function is trivial if the corresponding 10472 // implicitly-declared function would have been. 10473 switch (getSpecialMember(MD)) { 10474 case CXXInvalid: 10475 break; 10476 case CXXDefaultConstructor: 10477 MD->setTrivial(MD->getParent()->hasTrivialDefaultConstructor()); 10478 break; 10479 case CXXCopyConstructor: 10480 MD->setTrivial(MD->getParent()->hasTrivialCopyConstructor()); 10481 break; 10482 case CXXMoveConstructor: 10483 MD->setTrivial(MD->getParent()->hasTrivialMoveConstructor()); 10484 break; 10485 case CXXCopyAssignment: 10486 MD->setTrivial(MD->getParent()->hasTrivialCopyAssignment()); 10487 break; 10488 case CXXMoveAssignment: 10489 MD->setTrivial(MD->getParent()->hasTrivialMoveAssignment()); 10490 break; 10491 case CXXDestructor: 10492 MD->setTrivial(MD->getParent()->hasTrivialDestructor()); 10493 break; 10494 } 10495} 10496 10497void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10498 CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(Dcl); 10499 10500 if (MD) { 10501 if (MD->getParent()->isDependentType()) { 10502 MD->setDefaulted(); 10503 MD->setExplicitlyDefaulted(); 10504 return; 10505 } 10506 10507 CXXSpecialMember Member = getSpecialMember(MD); 10508 if (Member == CXXInvalid) { 10509 Diag(DefaultLoc, diag::err_default_special_members); 10510 return; 10511 } 10512 10513 MD->setDefaulted(); 10514 MD->setExplicitlyDefaulted(); 10515 10516 // If this definition appears within the record, do the checking when 10517 // the record is complete. 10518 const FunctionDecl *Primary = MD; 10519 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 10520 // Find the uninstantiated declaration that actually had the '= default' 10521 // on it. 10522 Pattern->isDefined(Primary); 10523 10524 if (Primary == Primary->getCanonicalDecl()) 10525 return; 10526 10527 CheckExplicitlyDefaultedSpecialMember(MD); 10528 10529 switch (Member) { 10530 case CXXDefaultConstructor: { 10531 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10532 if (!CD->isInvalidDecl()) 10533 DefineImplicitDefaultConstructor(DefaultLoc, CD); 10534 break; 10535 } 10536 10537 case CXXCopyConstructor: { 10538 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10539 if (!CD->isInvalidDecl()) 10540 DefineImplicitCopyConstructor(DefaultLoc, CD); 10541 break; 10542 } 10543 10544 case CXXCopyAssignment: { 10545 if (!MD->isInvalidDecl()) 10546 DefineImplicitCopyAssignment(DefaultLoc, MD); 10547 break; 10548 } 10549 10550 case CXXDestructor: { 10551 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 10552 if (!DD->isInvalidDecl()) 10553 DefineImplicitDestructor(DefaultLoc, DD); 10554 break; 10555 } 10556 10557 case CXXMoveConstructor: { 10558 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 10559 if (!CD->isInvalidDecl()) 10560 DefineImplicitMoveConstructor(DefaultLoc, CD); 10561 break; 10562 } 10563 10564 case CXXMoveAssignment: { 10565 if (!MD->isInvalidDecl()) 10566 DefineImplicitMoveAssignment(DefaultLoc, MD); 10567 break; 10568 } 10569 10570 case CXXInvalid: 10571 llvm_unreachable("Invalid special member."); 10572 } 10573 } else { 10574 Diag(DefaultLoc, diag::err_default_special_members); 10575 } 10576} 10577 10578static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 10579 for (Stmt::child_range CI = S->children(); CI; ++CI) { 10580 Stmt *SubStmt = *CI; 10581 if (!SubStmt) 10582 continue; 10583 if (isa<ReturnStmt>(SubStmt)) 10584 Self.Diag(SubStmt->getLocStart(), 10585 diag::err_return_in_constructor_handler); 10586 if (!isa<Expr>(SubStmt)) 10587 SearchForReturnInStmt(Self, SubStmt); 10588 } 10589} 10590 10591void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 10592 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 10593 CXXCatchStmt *Handler = TryBlock->getHandler(I); 10594 SearchForReturnInStmt(*this, Handler); 10595 } 10596} 10597 10598bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 10599 const CXXMethodDecl *Old) { 10600 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 10601 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 10602 10603 if (Context.hasSameType(NewTy, OldTy) || 10604 NewTy->isDependentType() || OldTy->isDependentType()) 10605 return false; 10606 10607 // Check if the return types are covariant 10608 QualType NewClassTy, OldClassTy; 10609 10610 /// Both types must be pointers or references to classes. 10611 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 10612 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 10613 NewClassTy = NewPT->getPointeeType(); 10614 OldClassTy = OldPT->getPointeeType(); 10615 } 10616 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 10617 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 10618 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 10619 NewClassTy = NewRT->getPointeeType(); 10620 OldClassTy = OldRT->getPointeeType(); 10621 } 10622 } 10623 } 10624 10625 // The return types aren't either both pointers or references to a class type. 10626 if (NewClassTy.isNull()) { 10627 Diag(New->getLocation(), 10628 diag::err_different_return_type_for_overriding_virtual_function) 10629 << New->getDeclName() << NewTy << OldTy; 10630 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10631 10632 return true; 10633 } 10634 10635 // C++ [class.virtual]p6: 10636 // If the return type of D::f differs from the return type of B::f, the 10637 // class type in the return type of D::f shall be complete at the point of 10638 // declaration of D::f or shall be the class type D. 10639 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 10640 if (!RT->isBeingDefined() && 10641 RequireCompleteType(New->getLocation(), NewClassTy, 10642 diag::err_covariant_return_incomplete, 10643 New->getDeclName())) 10644 return true; 10645 } 10646 10647 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 10648 // Check if the new class derives from the old class. 10649 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 10650 Diag(New->getLocation(), 10651 diag::err_covariant_return_not_derived) 10652 << New->getDeclName() << NewTy << OldTy; 10653 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10654 return true; 10655 } 10656 10657 // Check if we the conversion from derived to base is valid. 10658 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 10659 diag::err_covariant_return_inaccessible_base, 10660 diag::err_covariant_return_ambiguous_derived_to_base_conv, 10661 // FIXME: Should this point to the return type? 10662 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 10663 // FIXME: this note won't trigger for delayed access control 10664 // diagnostics, and it's impossible to get an undelayed error 10665 // here from access control during the original parse because 10666 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 10667 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10668 return true; 10669 } 10670 } 10671 10672 // The qualifiers of the return types must be the same. 10673 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 10674 Diag(New->getLocation(), 10675 diag::err_covariant_return_type_different_qualifications) 10676 << New->getDeclName() << NewTy << OldTy; 10677 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10678 return true; 10679 }; 10680 10681 10682 // The new class type must have the same or less qualifiers as the old type. 10683 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 10684 Diag(New->getLocation(), 10685 diag::err_covariant_return_type_class_type_more_qualified) 10686 << New->getDeclName() << NewTy << OldTy; 10687 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 10688 return true; 10689 }; 10690 10691 return false; 10692} 10693 10694/// \brief Mark the given method pure. 10695/// 10696/// \param Method the method to be marked pure. 10697/// 10698/// \param InitRange the source range that covers the "0" initializer. 10699bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 10700 SourceLocation EndLoc = InitRange.getEnd(); 10701 if (EndLoc.isValid()) 10702 Method->setRangeEnd(EndLoc); 10703 10704 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 10705 Method->setPure(); 10706 return false; 10707 } 10708 10709 if (!Method->isInvalidDecl()) 10710 Diag(Method->getLocation(), diag::err_non_virtual_pure) 10711 << Method->getDeclName() << InitRange; 10712 return true; 10713} 10714 10715/// \brief Determine whether the given declaration is a static data member. 10716static bool isStaticDataMember(Decl *D) { 10717 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 10718 if (!Var) 10719 return false; 10720 10721 return Var->isStaticDataMember(); 10722} 10723/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 10724/// an initializer for the out-of-line declaration 'Dcl'. The scope 10725/// is a fresh scope pushed for just this purpose. 10726/// 10727/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 10728/// static data member of class X, names should be looked up in the scope of 10729/// class X. 10730void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 10731 // If there is no declaration, there was an error parsing it. 10732 if (D == 0 || D->isInvalidDecl()) return; 10733 10734 // We should only get called for declarations with scope specifiers, like: 10735 // int foo::bar; 10736 assert(D->isOutOfLine()); 10737 EnterDeclaratorContext(S, D->getDeclContext()); 10738 10739 // If we are parsing the initializer for a static data member, push a 10740 // new expression evaluation context that is associated with this static 10741 // data member. 10742 if (isStaticDataMember(D)) 10743 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 10744} 10745 10746/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 10747/// initializer for the out-of-line declaration 'D'. 10748void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 10749 // If there is no declaration, there was an error parsing it. 10750 if (D == 0 || D->isInvalidDecl()) return; 10751 10752 if (isStaticDataMember(D)) 10753 PopExpressionEvaluationContext(); 10754 10755 assert(D->isOutOfLine()); 10756 ExitDeclaratorContext(S); 10757} 10758 10759/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 10760/// C++ if/switch/while/for statement. 10761/// e.g: "if (int x = f()) {...}" 10762DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 10763 // C++ 6.4p2: 10764 // The declarator shall not specify a function or an array. 10765 // The type-specifier-seq shall not contain typedef and shall not declare a 10766 // new class or enumeration. 10767 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 10768 "Parser allowed 'typedef' as storage class of condition decl."); 10769 10770 Decl *Dcl = ActOnDeclarator(S, D); 10771 if (!Dcl) 10772 return true; 10773 10774 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 10775 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 10776 << D.getSourceRange(); 10777 return true; 10778 } 10779 10780 return Dcl; 10781} 10782 10783void Sema::LoadExternalVTableUses() { 10784 if (!ExternalSource) 10785 return; 10786 10787 SmallVector<ExternalVTableUse, 4> VTables; 10788 ExternalSource->ReadUsedVTables(VTables); 10789 SmallVector<VTableUse, 4> NewUses; 10790 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 10791 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 10792 = VTablesUsed.find(VTables[I].Record); 10793 // Even if a definition wasn't required before, it may be required now. 10794 if (Pos != VTablesUsed.end()) { 10795 if (!Pos->second && VTables[I].DefinitionRequired) 10796 Pos->second = true; 10797 continue; 10798 } 10799 10800 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 10801 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 10802 } 10803 10804 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 10805} 10806 10807void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 10808 bool DefinitionRequired) { 10809 // Ignore any vtable uses in unevaluated operands or for classes that do 10810 // not have a vtable. 10811 if (!Class->isDynamicClass() || Class->isDependentContext() || 10812 CurContext->isDependentContext() || 10813 ExprEvalContexts.back().Context == Unevaluated) 10814 return; 10815 10816 // Try to insert this class into the map. 10817 LoadExternalVTableUses(); 10818 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10819 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 10820 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 10821 if (!Pos.second) { 10822 // If we already had an entry, check to see if we are promoting this vtable 10823 // to required a definition. If so, we need to reappend to the VTableUses 10824 // list, since we may have already processed the first entry. 10825 if (DefinitionRequired && !Pos.first->second) { 10826 Pos.first->second = true; 10827 } else { 10828 // Otherwise, we can early exit. 10829 return; 10830 } 10831 } 10832 10833 // Local classes need to have their virtual members marked 10834 // immediately. For all other classes, we mark their virtual members 10835 // at the end of the translation unit. 10836 if (Class->isLocalClass()) 10837 MarkVirtualMembersReferenced(Loc, Class); 10838 else 10839 VTableUses.push_back(std::make_pair(Class, Loc)); 10840} 10841 10842bool Sema::DefineUsedVTables() { 10843 LoadExternalVTableUses(); 10844 if (VTableUses.empty()) 10845 return false; 10846 10847 // Note: The VTableUses vector could grow as a result of marking 10848 // the members of a class as "used", so we check the size each 10849 // time through the loop and prefer indices (which are stable) to 10850 // iterators (which are not). 10851 bool DefinedAnything = false; 10852 for (unsigned I = 0; I != VTableUses.size(); ++I) { 10853 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 10854 if (!Class) 10855 continue; 10856 10857 SourceLocation Loc = VTableUses[I].second; 10858 10859 bool DefineVTable = true; 10860 10861 // If this class has a key function, but that key function is 10862 // defined in another translation unit, we don't need to emit the 10863 // vtable even though we're using it. 10864 const CXXMethodDecl *KeyFunction = Context.getKeyFunction(Class); 10865 if (KeyFunction && !KeyFunction->hasBody()) { 10866 switch (KeyFunction->getTemplateSpecializationKind()) { 10867 case TSK_Undeclared: 10868 case TSK_ExplicitSpecialization: 10869 case TSK_ExplicitInstantiationDeclaration: 10870 // The key function is in another translation unit. 10871 DefineVTable = false; 10872 break; 10873 10874 case TSK_ExplicitInstantiationDefinition: 10875 case TSK_ImplicitInstantiation: 10876 // We will be instantiating the key function. 10877 break; 10878 } 10879 } else if (!KeyFunction) { 10880 // If we have a class with no key function that is the subject 10881 // of an explicit instantiation declaration, suppress the 10882 // vtable; it will live with the explicit instantiation 10883 // definition. 10884 bool IsExplicitInstantiationDeclaration 10885 = Class->getTemplateSpecializationKind() 10886 == TSK_ExplicitInstantiationDeclaration; 10887 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 10888 REnd = Class->redecls_end(); 10889 R != REnd; ++R) { 10890 TemplateSpecializationKind TSK 10891 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 10892 if (TSK == TSK_ExplicitInstantiationDeclaration) 10893 IsExplicitInstantiationDeclaration = true; 10894 else if (TSK == TSK_ExplicitInstantiationDefinition) { 10895 IsExplicitInstantiationDeclaration = false; 10896 break; 10897 } 10898 } 10899 10900 if (IsExplicitInstantiationDeclaration) 10901 DefineVTable = false; 10902 } 10903 10904 // The exception specifications for all virtual members may be needed even 10905 // if we are not providing an authoritative form of the vtable in this TU. 10906 // We may choose to emit it available_externally anyway. 10907 if (!DefineVTable) { 10908 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 10909 continue; 10910 } 10911 10912 // Mark all of the virtual members of this class as referenced, so 10913 // that we can build a vtable. Then, tell the AST consumer that a 10914 // vtable for this class is required. 10915 DefinedAnything = true; 10916 MarkVirtualMembersReferenced(Loc, Class); 10917 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 10918 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 10919 10920 // Optionally warn if we're emitting a weak vtable. 10921 if (Class->getLinkage() == ExternalLinkage && 10922 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 10923 const FunctionDecl *KeyFunctionDef = 0; 10924 if (!KeyFunction || 10925 (KeyFunction->hasBody(KeyFunctionDef) && 10926 KeyFunctionDef->isInlined())) 10927 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 10928 TSK_ExplicitInstantiationDefinition 10929 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 10930 << Class; 10931 } 10932 } 10933 VTableUses.clear(); 10934 10935 return DefinedAnything; 10936} 10937 10938void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 10939 const CXXRecordDecl *RD) { 10940 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 10941 E = RD->method_end(); I != E; ++I) 10942 if ((*I)->isVirtual() && !(*I)->isPure()) 10943 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 10944} 10945 10946void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 10947 const CXXRecordDecl *RD) { 10948 // Mark all functions which will appear in RD's vtable as used. 10949 CXXFinalOverriderMap FinalOverriders; 10950 RD->getFinalOverriders(FinalOverriders); 10951 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 10952 E = FinalOverriders.end(); 10953 I != E; ++I) { 10954 for (OverridingMethods::const_iterator OI = I->second.begin(), 10955 OE = I->second.end(); 10956 OI != OE; ++OI) { 10957 assert(OI->second.size() > 0 && "no final overrider"); 10958 CXXMethodDecl *Overrider = OI->second.front().Method; 10959 10960 // C++ [basic.def.odr]p2: 10961 // [...] A virtual member function is used if it is not pure. [...] 10962 if (!Overrider->isPure()) 10963 MarkFunctionReferenced(Loc, Overrider); 10964 } 10965 } 10966 10967 // Only classes that have virtual bases need a VTT. 10968 if (RD->getNumVBases() == 0) 10969 return; 10970 10971 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 10972 e = RD->bases_end(); i != e; ++i) { 10973 const CXXRecordDecl *Base = 10974 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 10975 if (Base->getNumVBases() == 0) 10976 continue; 10977 MarkVirtualMembersReferenced(Loc, Base); 10978 } 10979} 10980 10981/// SetIvarInitializers - This routine builds initialization ASTs for the 10982/// Objective-C implementation whose ivars need be initialized. 10983void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 10984 if (!getLangOpts().CPlusPlus) 10985 return; 10986 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 10987 SmallVector<ObjCIvarDecl*, 8> ivars; 10988 CollectIvarsToConstructOrDestruct(OID, ivars); 10989 if (ivars.empty()) 10990 return; 10991 SmallVector<CXXCtorInitializer*, 32> AllToInit; 10992 for (unsigned i = 0; i < ivars.size(); i++) { 10993 FieldDecl *Field = ivars[i]; 10994 if (Field->isInvalidDecl()) 10995 continue; 10996 10997 CXXCtorInitializer *Member; 10998 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 10999 InitializationKind InitKind = 11000 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11001 11002 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11003 ExprResult MemberInit = 11004 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11005 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11006 // Note, MemberInit could actually come back empty if no initialization 11007 // is required (e.g., because it would call a trivial default constructor) 11008 if (!MemberInit.get() || MemberInit.isInvalid()) 11009 continue; 11010 11011 Member = 11012 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11013 SourceLocation(), 11014 MemberInit.takeAs<Expr>(), 11015 SourceLocation()); 11016 AllToInit.push_back(Member); 11017 11018 // Be sure that the destructor is accessible and is marked as referenced. 11019 if (const RecordType *RecordTy 11020 = Context.getBaseElementType(Field->getType()) 11021 ->getAs<RecordType>()) { 11022 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11023 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11024 MarkFunctionReferenced(Field->getLocation(), Destructor); 11025 CheckDestructorAccess(Field->getLocation(), Destructor, 11026 PDiag(diag::err_access_dtor_ivar) 11027 << Context.getBaseElementType(Field->getType())); 11028 } 11029 } 11030 } 11031 ObjCImplementation->setIvarInitializers(Context, 11032 AllToInit.data(), AllToInit.size()); 11033 } 11034} 11035 11036static 11037void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11038 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11039 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11040 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11041 Sema &S) { 11042 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11043 CE = Current.end(); 11044 if (Ctor->isInvalidDecl()) 11045 return; 11046 11047 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11048 11049 // Target may not be determinable yet, for instance if this is a dependent 11050 // call in an uninstantiated template. 11051 if (Target) { 11052 const FunctionDecl *FNTarget = 0; 11053 (void)Target->hasBody(FNTarget); 11054 Target = const_cast<CXXConstructorDecl*>( 11055 cast_or_null<CXXConstructorDecl>(FNTarget)); 11056 } 11057 11058 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11059 // Avoid dereferencing a null pointer here. 11060 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11061 11062 if (!Current.insert(Canonical)) 11063 return; 11064 11065 // We know that beyond here, we aren't chaining into a cycle. 11066 if (!Target || !Target->isDelegatingConstructor() || 11067 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11068 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11069 Valid.insert(*CI); 11070 Current.clear(); 11071 // We've hit a cycle. 11072 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11073 Current.count(TCanonical)) { 11074 // If we haven't diagnosed this cycle yet, do so now. 11075 if (!Invalid.count(TCanonical)) { 11076 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11077 diag::warn_delegating_ctor_cycle) 11078 << Ctor; 11079 11080 // Don't add a note for a function delegating directly to itself. 11081 if (TCanonical != Canonical) 11082 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11083 11084 CXXConstructorDecl *C = Target; 11085 while (C->getCanonicalDecl() != Canonical) { 11086 const FunctionDecl *FNTarget = 0; 11087 (void)C->getTargetConstructor()->hasBody(FNTarget); 11088 assert(FNTarget && "Ctor cycle through bodiless function"); 11089 11090 C = const_cast<CXXConstructorDecl*>( 11091 cast<CXXConstructorDecl>(FNTarget)); 11092 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11093 } 11094 } 11095 11096 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11097 Invalid.insert(*CI); 11098 Current.clear(); 11099 } else { 11100 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11101 } 11102} 11103 11104 11105void Sema::CheckDelegatingCtorCycles() { 11106 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11107 11108 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11109 CE = Current.end(); 11110 11111 for (DelegatingCtorDeclsType::iterator 11112 I = DelegatingCtorDecls.begin(ExternalSource), 11113 E = DelegatingCtorDecls.end(); 11114 I != E; ++I) 11115 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11116 11117 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11118 (*CI)->setInvalidDecl(); 11119} 11120 11121namespace { 11122 /// \brief AST visitor that finds references to the 'this' expression. 11123 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11124 Sema &S; 11125 11126 public: 11127 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11128 11129 bool VisitCXXThisExpr(CXXThisExpr *E) { 11130 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11131 << E->isImplicit(); 11132 return false; 11133 } 11134 }; 11135} 11136 11137bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11138 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11139 if (!TSInfo) 11140 return false; 11141 11142 TypeLoc TL = TSInfo->getTypeLoc(); 11143 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11144 if (!ProtoTL) 11145 return false; 11146 11147 // C++11 [expr.prim.general]p3: 11148 // [The expression this] shall not appear before the optional 11149 // cv-qualifier-seq and it shall not appear within the declaration of a 11150 // static member function (although its type and value category are defined 11151 // within a static member function as they are within a non-static member 11152 // function). [ Note: this is because declaration matching does not occur 11153 // until the complete declarator is known. - end note ] 11154 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11155 FindCXXThisExpr Finder(*this); 11156 11157 // If the return type came after the cv-qualifier-seq, check it now. 11158 if (Proto->hasTrailingReturn() && 11159 !Finder.TraverseTypeLoc(ProtoTL->getResultLoc())) 11160 return true; 11161 11162 // Check the exception specification. 11163 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11164 return true; 11165 11166 return checkThisInStaticMemberFunctionAttributes(Method); 11167} 11168 11169bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11170 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11171 if (!TSInfo) 11172 return false; 11173 11174 TypeLoc TL = TSInfo->getTypeLoc(); 11175 FunctionProtoTypeLoc *ProtoTL = dyn_cast<FunctionProtoTypeLoc>(&TL); 11176 if (!ProtoTL) 11177 return false; 11178 11179 const FunctionProtoType *Proto = ProtoTL->getTypePtr(); 11180 FindCXXThisExpr Finder(*this); 11181 11182 switch (Proto->getExceptionSpecType()) { 11183 case EST_Uninstantiated: 11184 case EST_Unevaluated: 11185 case EST_BasicNoexcept: 11186 case EST_DynamicNone: 11187 case EST_MSAny: 11188 case EST_None: 11189 break; 11190 11191 case EST_ComputedNoexcept: 11192 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11193 return true; 11194 11195 case EST_Dynamic: 11196 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11197 EEnd = Proto->exception_end(); 11198 E != EEnd; ++E) { 11199 if (!Finder.TraverseType(*E)) 11200 return true; 11201 } 11202 break; 11203 } 11204 11205 return false; 11206} 11207 11208bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11209 FindCXXThisExpr Finder(*this); 11210 11211 // Check attributes. 11212 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11213 A != AEnd; ++A) { 11214 // FIXME: This should be emitted by tblgen. 11215 Expr *Arg = 0; 11216 ArrayRef<Expr *> Args; 11217 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11218 Arg = G->getArg(); 11219 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11220 Arg = G->getArg(); 11221 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11222 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11223 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11224 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11225 else if (ExclusiveLockFunctionAttr *ELF 11226 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11227 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11228 else if (SharedLockFunctionAttr *SLF 11229 = dyn_cast<SharedLockFunctionAttr>(*A)) 11230 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11231 else if (ExclusiveTrylockFunctionAttr *ETLF 11232 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11233 Arg = ETLF->getSuccessValue(); 11234 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11235 } else if (SharedTrylockFunctionAttr *STLF 11236 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11237 Arg = STLF->getSuccessValue(); 11238 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11239 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11240 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11241 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11242 Arg = LR->getArg(); 11243 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11244 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11245 else if (ExclusiveLocksRequiredAttr *ELR 11246 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11247 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11248 else if (SharedLocksRequiredAttr *SLR 11249 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11250 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11251 11252 if (Arg && !Finder.TraverseStmt(Arg)) 11253 return true; 11254 11255 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11256 if (!Finder.TraverseStmt(Args[I])) 11257 return true; 11258 } 11259 } 11260 11261 return false; 11262} 11263 11264void 11265Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11266 ArrayRef<ParsedType> DynamicExceptions, 11267 ArrayRef<SourceRange> DynamicExceptionRanges, 11268 Expr *NoexceptExpr, 11269 llvm::SmallVectorImpl<QualType> &Exceptions, 11270 FunctionProtoType::ExtProtoInfo &EPI) { 11271 Exceptions.clear(); 11272 EPI.ExceptionSpecType = EST; 11273 if (EST == EST_Dynamic) { 11274 Exceptions.reserve(DynamicExceptions.size()); 11275 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11276 // FIXME: Preserve type source info. 11277 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11278 11279 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11280 collectUnexpandedParameterPacks(ET, Unexpanded); 11281 if (!Unexpanded.empty()) { 11282 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11283 UPPC_ExceptionType, 11284 Unexpanded); 11285 continue; 11286 } 11287 11288 // Check that the type is valid for an exception spec, and 11289 // drop it if not. 11290 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11291 Exceptions.push_back(ET); 11292 } 11293 EPI.NumExceptions = Exceptions.size(); 11294 EPI.Exceptions = Exceptions.data(); 11295 return; 11296 } 11297 11298 if (EST == EST_ComputedNoexcept) { 11299 // If an error occurred, there's no expression here. 11300 if (NoexceptExpr) { 11301 assert((NoexceptExpr->isTypeDependent() || 11302 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11303 Context.BoolTy) && 11304 "Parser should have made sure that the expression is boolean"); 11305 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11306 EPI.ExceptionSpecType = EST_BasicNoexcept; 11307 return; 11308 } 11309 11310 if (!NoexceptExpr->isValueDependent()) 11311 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11312 diag::err_noexcept_needs_constant_expression, 11313 /*AllowFold*/ false).take(); 11314 EPI.NoexceptExpr = NoexceptExpr; 11315 } 11316 return; 11317 } 11318} 11319 11320/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11321Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11322 // Implicitly declared functions (e.g. copy constructors) are 11323 // __host__ __device__ 11324 if (D->isImplicit()) 11325 return CFT_HostDevice; 11326 11327 if (D->hasAttr<CUDAGlobalAttr>()) 11328 return CFT_Global; 11329 11330 if (D->hasAttr<CUDADeviceAttr>()) { 11331 if (D->hasAttr<CUDAHostAttr>()) 11332 return CFT_HostDevice; 11333 else 11334 return CFT_Device; 11335 } 11336 11337 return CFT_Host; 11338} 11339 11340bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11341 CUDAFunctionTarget CalleeTarget) { 11342 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11343 // Callable from the device only." 11344 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11345 return true; 11346 11347 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11348 // Callable from the host only." 11349 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11350 // Callable from the host only." 11351 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11352 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11353 return true; 11354 11355 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11356 return true; 11357 11358 return false; 11359} 11360