SemaDeclCXX.cpp revision 0162c1ce296fc48fbe03a31a2ae00b939eef86a8
1//===------ SemaDeclCXX.cpp - Semantic Analysis for C++ Declarations ------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for C++ declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/ASTMutationListener.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/CharUnits.h" 20#include "clang/AST/DeclVisitor.h" 21#include "clang/AST/EvaluatedExprVisitor.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/RecordLayout.h" 24#include "clang/AST/RecursiveASTVisitor.h" 25#include "clang/AST/StmtVisitor.h" 26#include "clang/AST/TypeLoc.h" 27#include "clang/AST/TypeOrdering.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/TargetInfo.h" 30#include "clang/Lex/Preprocessor.h" 31#include "clang/Sema/CXXFieldCollector.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/Initialization.h" 34#include "clang/Sema/Lookup.h" 35#include "clang/Sema/ParsedTemplate.h" 36#include "clang/Sema/Scope.h" 37#include "clang/Sema/ScopeInfo.h" 38#include "llvm/ADT/STLExtras.h" 39#include "llvm/ADT/SmallString.h" 40#include <map> 41#include <set> 42 43using namespace clang; 44 45//===----------------------------------------------------------------------===// 46// CheckDefaultArgumentVisitor 47//===----------------------------------------------------------------------===// 48 49namespace { 50 /// CheckDefaultArgumentVisitor - C++ [dcl.fct.default] Traverses 51 /// the default argument of a parameter to determine whether it 52 /// contains any ill-formed subexpressions. For example, this will 53 /// diagnose the use of local variables or parameters within the 54 /// default argument expression. 55 class CheckDefaultArgumentVisitor 56 : public StmtVisitor<CheckDefaultArgumentVisitor, bool> { 57 Expr *DefaultArg; 58 Sema *S; 59 60 public: 61 CheckDefaultArgumentVisitor(Expr *defarg, Sema *s) 62 : DefaultArg(defarg), S(s) {} 63 64 bool VisitExpr(Expr *Node); 65 bool VisitDeclRefExpr(DeclRefExpr *DRE); 66 bool VisitCXXThisExpr(CXXThisExpr *ThisE); 67 bool VisitLambdaExpr(LambdaExpr *Lambda); 68 }; 69 70 /// VisitExpr - Visit all of the children of this expression. 71 bool CheckDefaultArgumentVisitor::VisitExpr(Expr *Node) { 72 bool IsInvalid = false; 73 for (Stmt::child_range I = Node->children(); I; ++I) 74 IsInvalid |= Visit(*I); 75 return IsInvalid; 76 } 77 78 /// VisitDeclRefExpr - Visit a reference to a declaration, to 79 /// determine whether this declaration can be used in the default 80 /// argument expression. 81 bool CheckDefaultArgumentVisitor::VisitDeclRefExpr(DeclRefExpr *DRE) { 82 NamedDecl *Decl = DRE->getDecl(); 83 if (ParmVarDecl *Param = dyn_cast<ParmVarDecl>(Decl)) { 84 // C++ [dcl.fct.default]p9 85 // Default arguments are evaluated each time the function is 86 // called. The order of evaluation of function arguments is 87 // unspecified. Consequently, parameters of a function shall not 88 // be used in default argument expressions, even if they are not 89 // evaluated. Parameters of a function declared before a default 90 // argument expression are in scope and can hide namespace and 91 // class member names. 92 return S->Diag(DRE->getLocStart(), 93 diag::err_param_default_argument_references_param) 94 << Param->getDeclName() << DefaultArg->getSourceRange(); 95 } else if (VarDecl *VDecl = dyn_cast<VarDecl>(Decl)) { 96 // C++ [dcl.fct.default]p7 97 // Local variables shall not be used in default argument 98 // expressions. 99 if (VDecl->isLocalVarDecl()) 100 return S->Diag(DRE->getLocStart(), 101 diag::err_param_default_argument_references_local) 102 << VDecl->getDeclName() << DefaultArg->getSourceRange(); 103 } 104 105 return false; 106 } 107 108 /// VisitCXXThisExpr - Visit a C++ "this" expression. 109 bool CheckDefaultArgumentVisitor::VisitCXXThisExpr(CXXThisExpr *ThisE) { 110 // C++ [dcl.fct.default]p8: 111 // The keyword this shall not be used in a default argument of a 112 // member function. 113 return S->Diag(ThisE->getLocStart(), 114 diag::err_param_default_argument_references_this) 115 << ThisE->getSourceRange(); 116 } 117 118 bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) { 119 // C++11 [expr.lambda.prim]p13: 120 // A lambda-expression appearing in a default argument shall not 121 // implicitly or explicitly capture any entity. 122 if (Lambda->capture_begin() == Lambda->capture_end()) 123 return false; 124 125 return S->Diag(Lambda->getLocStart(), 126 diag::err_lambda_capture_default_arg); 127 } 128} 129 130void Sema::ImplicitExceptionSpecification::CalledDecl(SourceLocation CallLoc, 131 CXXMethodDecl *Method) { 132 // If we have an MSAny spec already, don't bother. 133 if (!Method || ComputedEST == EST_MSAny) 134 return; 135 136 const FunctionProtoType *Proto 137 = Method->getType()->getAs<FunctionProtoType>(); 138 Proto = Self->ResolveExceptionSpec(CallLoc, Proto); 139 if (!Proto) 140 return; 141 142 ExceptionSpecificationType EST = Proto->getExceptionSpecType(); 143 144 // If this function can throw any exceptions, make a note of that. 145 if (EST == EST_MSAny || EST == EST_None) { 146 ClearExceptions(); 147 ComputedEST = EST; 148 return; 149 } 150 151 // FIXME: If the call to this decl is using any of its default arguments, we 152 // need to search them for potentially-throwing calls. 153 154 // If this function has a basic noexcept, it doesn't affect the outcome. 155 if (EST == EST_BasicNoexcept) 156 return; 157 158 // If we have a throw-all spec at this point, ignore the function. 159 if (ComputedEST == EST_None) 160 return; 161 162 // If we're still at noexcept(true) and there's a nothrow() callee, 163 // change to that specification. 164 if (EST == EST_DynamicNone) { 165 if (ComputedEST == EST_BasicNoexcept) 166 ComputedEST = EST_DynamicNone; 167 return; 168 } 169 170 // Check out noexcept specs. 171 if (EST == EST_ComputedNoexcept) { 172 FunctionProtoType::NoexceptResult NR = 173 Proto->getNoexceptSpec(Self->Context); 174 assert(NR != FunctionProtoType::NR_NoNoexcept && 175 "Must have noexcept result for EST_ComputedNoexcept."); 176 assert(NR != FunctionProtoType::NR_Dependent && 177 "Should not generate implicit declarations for dependent cases, " 178 "and don't know how to handle them anyway."); 179 180 // noexcept(false) -> no spec on the new function 181 if (NR == FunctionProtoType::NR_Throw) { 182 ClearExceptions(); 183 ComputedEST = EST_None; 184 } 185 // noexcept(true) won't change anything either. 186 return; 187 } 188 189 assert(EST == EST_Dynamic && "EST case not considered earlier."); 190 assert(ComputedEST != EST_None && 191 "Shouldn't collect exceptions when throw-all is guaranteed."); 192 ComputedEST = EST_Dynamic; 193 // Record the exceptions in this function's exception specification. 194 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 195 EEnd = Proto->exception_end(); 196 E != EEnd; ++E) 197 if (ExceptionsSeen.insert(Self->Context.getCanonicalType(*E))) 198 Exceptions.push_back(*E); 199} 200 201void Sema::ImplicitExceptionSpecification::CalledExpr(Expr *E) { 202 if (!E || ComputedEST == EST_MSAny) 203 return; 204 205 // FIXME: 206 // 207 // C++0x [except.spec]p14: 208 // [An] implicit exception-specification specifies the type-id T if and 209 // only if T is allowed by the exception-specification of a function directly 210 // invoked by f's implicit definition; f shall allow all exceptions if any 211 // function it directly invokes allows all exceptions, and f shall allow no 212 // exceptions if every function it directly invokes allows no exceptions. 213 // 214 // Note in particular that if an implicit exception-specification is generated 215 // for a function containing a throw-expression, that specification can still 216 // be noexcept(true). 217 // 218 // Note also that 'directly invoked' is not defined in the standard, and there 219 // is no indication that we should only consider potentially-evaluated calls. 220 // 221 // Ultimately we should implement the intent of the standard: the exception 222 // specification should be the set of exceptions which can be thrown by the 223 // implicit definition. For now, we assume that any non-nothrow expression can 224 // throw any exception. 225 226 if (Self->canThrow(E)) 227 ComputedEST = EST_None; 228} 229 230bool 231Sema::SetParamDefaultArgument(ParmVarDecl *Param, Expr *Arg, 232 SourceLocation EqualLoc) { 233 if (RequireCompleteType(Param->getLocation(), Param->getType(), 234 diag::err_typecheck_decl_incomplete_type)) { 235 Param->setInvalidDecl(); 236 return true; 237 } 238 239 // C++ [dcl.fct.default]p5 240 // A default argument expression is implicitly converted (clause 241 // 4) to the parameter type. The default argument expression has 242 // the same semantic constraints as the initializer expression in 243 // a declaration of a variable of the parameter type, using the 244 // copy-initialization semantics (8.5). 245 InitializedEntity Entity = InitializedEntity::InitializeParameter(Context, 246 Param); 247 InitializationKind Kind = InitializationKind::CreateCopy(Param->getLocation(), 248 EqualLoc); 249 InitializationSequence InitSeq(*this, Entity, Kind, &Arg, 1); 250 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, Arg); 251 if (Result.isInvalid()) 252 return true; 253 Arg = Result.takeAs<Expr>(); 254 255 CheckCompletedExpr(Arg, EqualLoc); 256 Arg = MaybeCreateExprWithCleanups(Arg); 257 258 // Okay: add the default argument to the parameter 259 Param->setDefaultArg(Arg); 260 261 // We have already instantiated this parameter; provide each of the 262 // instantiations with the uninstantiated default argument. 263 UnparsedDefaultArgInstantiationsMap::iterator InstPos 264 = UnparsedDefaultArgInstantiations.find(Param); 265 if (InstPos != UnparsedDefaultArgInstantiations.end()) { 266 for (unsigned I = 0, N = InstPos->second.size(); I != N; ++I) 267 InstPos->second[I]->setUninstantiatedDefaultArg(Arg); 268 269 // We're done tracking this parameter's instantiations. 270 UnparsedDefaultArgInstantiations.erase(InstPos); 271 } 272 273 return false; 274} 275 276/// ActOnParamDefaultArgument - Check whether the default argument 277/// provided for a function parameter is well-formed. If so, attach it 278/// to the parameter declaration. 279void 280Sema::ActOnParamDefaultArgument(Decl *param, SourceLocation EqualLoc, 281 Expr *DefaultArg) { 282 if (!param || !DefaultArg) 283 return; 284 285 ParmVarDecl *Param = cast<ParmVarDecl>(param); 286 UnparsedDefaultArgLocs.erase(Param); 287 288 // Default arguments are only permitted in C++ 289 if (!getLangOpts().CPlusPlus) { 290 Diag(EqualLoc, diag::err_param_default_argument) 291 << DefaultArg->getSourceRange(); 292 Param->setInvalidDecl(); 293 return; 294 } 295 296 // Check for unexpanded parameter packs. 297 if (DiagnoseUnexpandedParameterPack(DefaultArg, UPPC_DefaultArgument)) { 298 Param->setInvalidDecl(); 299 return; 300 } 301 302 // Check that the default argument is well-formed 303 CheckDefaultArgumentVisitor DefaultArgChecker(DefaultArg, this); 304 if (DefaultArgChecker.Visit(DefaultArg)) { 305 Param->setInvalidDecl(); 306 return; 307 } 308 309 SetParamDefaultArgument(Param, DefaultArg, EqualLoc); 310} 311 312/// ActOnParamUnparsedDefaultArgument - We've seen a default 313/// argument for a function parameter, but we can't parse it yet 314/// because we're inside a class definition. Note that this default 315/// argument will be parsed later. 316void Sema::ActOnParamUnparsedDefaultArgument(Decl *param, 317 SourceLocation EqualLoc, 318 SourceLocation ArgLoc) { 319 if (!param) 320 return; 321 322 ParmVarDecl *Param = cast<ParmVarDecl>(param); 323 if (Param) 324 Param->setUnparsedDefaultArg(); 325 326 UnparsedDefaultArgLocs[Param] = ArgLoc; 327} 328 329/// ActOnParamDefaultArgumentError - Parsing or semantic analysis of 330/// the default argument for the parameter param failed. 331void Sema::ActOnParamDefaultArgumentError(Decl *param) { 332 if (!param) 333 return; 334 335 ParmVarDecl *Param = cast<ParmVarDecl>(param); 336 337 Param->setInvalidDecl(); 338 339 UnparsedDefaultArgLocs.erase(Param); 340} 341 342/// CheckExtraCXXDefaultArguments - Check for any extra default 343/// arguments in the declarator, which is not a function declaration 344/// or definition and therefore is not permitted to have default 345/// arguments. This routine should be invoked for every declarator 346/// that is not a function declaration or definition. 347void Sema::CheckExtraCXXDefaultArguments(Declarator &D) { 348 // C++ [dcl.fct.default]p3 349 // A default argument expression shall be specified only in the 350 // parameter-declaration-clause of a function declaration or in a 351 // template-parameter (14.1). It shall not be specified for a 352 // parameter pack. If it is specified in a 353 // parameter-declaration-clause, it shall not occur within a 354 // declarator or abstract-declarator of a parameter-declaration. 355 bool MightBeFunction = D.isFunctionDeclarationContext(); 356 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 357 DeclaratorChunk &chunk = D.getTypeObject(i); 358 if (chunk.Kind == DeclaratorChunk::Function) { 359 if (MightBeFunction) { 360 // This is a function declaration. It can have default arguments, but 361 // keep looking in case its return type is a function type with default 362 // arguments. 363 MightBeFunction = false; 364 continue; 365 } 366 for (unsigned argIdx = 0, e = chunk.Fun.NumArgs; argIdx != e; ++argIdx) { 367 ParmVarDecl *Param = 368 cast<ParmVarDecl>(chunk.Fun.ArgInfo[argIdx].Param); 369 if (Param->hasUnparsedDefaultArg()) { 370 CachedTokens *Toks = chunk.Fun.ArgInfo[argIdx].DefaultArgTokens; 371 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 372 << SourceRange((*Toks)[1].getLocation(), 373 Toks->back().getLocation()); 374 delete Toks; 375 chunk.Fun.ArgInfo[argIdx].DefaultArgTokens = 0; 376 } else if (Param->getDefaultArg()) { 377 Diag(Param->getLocation(), diag::err_param_default_argument_nonfunc) 378 << Param->getDefaultArg()->getSourceRange(); 379 Param->setDefaultArg(0); 380 } 381 } 382 } else if (chunk.Kind != DeclaratorChunk::Paren) { 383 MightBeFunction = false; 384 } 385 } 386} 387 388/// MergeCXXFunctionDecl - Merge two declarations of the same C++ 389/// function, once we already know that they have the same 390/// type. Subroutine of MergeFunctionDecl. Returns true if there was an 391/// error, false otherwise. 392bool Sema::MergeCXXFunctionDecl(FunctionDecl *New, FunctionDecl *Old, 393 Scope *S) { 394 bool Invalid = false; 395 396 // C++ [dcl.fct.default]p4: 397 // For non-template functions, default arguments can be added in 398 // later declarations of a function in the same 399 // scope. Declarations in different scopes have completely 400 // distinct sets of default arguments. That is, declarations in 401 // inner scopes do not acquire default arguments from 402 // declarations in outer scopes, and vice versa. In a given 403 // function declaration, all parameters subsequent to a 404 // parameter with a default argument shall have default 405 // arguments supplied in this or previous declarations. A 406 // default argument shall not be redefined by a later 407 // declaration (not even to the same value). 408 // 409 // C++ [dcl.fct.default]p6: 410 // Except for member functions of class templates, the default arguments 411 // in a member function definition that appears outside of the class 412 // definition are added to the set of default arguments provided by the 413 // member function declaration in the class definition. 414 for (unsigned p = 0, NumParams = Old->getNumParams(); p < NumParams; ++p) { 415 ParmVarDecl *OldParam = Old->getParamDecl(p); 416 ParmVarDecl *NewParam = New->getParamDecl(p); 417 418 bool OldParamHasDfl = OldParam->hasDefaultArg(); 419 bool NewParamHasDfl = NewParam->hasDefaultArg(); 420 421 NamedDecl *ND = Old; 422 if (S && !isDeclInScope(ND, New->getDeclContext(), S)) 423 // Ignore default parameters of old decl if they are not in 424 // the same scope. 425 OldParamHasDfl = false; 426 427 if (OldParamHasDfl && NewParamHasDfl) { 428 429 unsigned DiagDefaultParamID = 430 diag::err_param_default_argument_redefinition; 431 432 // MSVC accepts that default parameters be redefined for member functions 433 // of template class. The new default parameter's value is ignored. 434 Invalid = true; 435 if (getLangOpts().MicrosoftExt) { 436 CXXMethodDecl* MD = dyn_cast<CXXMethodDecl>(New); 437 if (MD && MD->getParent()->getDescribedClassTemplate()) { 438 // Merge the old default argument into the new parameter. 439 NewParam->setHasInheritedDefaultArg(); 440 if (OldParam->hasUninstantiatedDefaultArg()) 441 NewParam->setUninstantiatedDefaultArg( 442 OldParam->getUninstantiatedDefaultArg()); 443 else 444 NewParam->setDefaultArg(OldParam->getInit()); 445 DiagDefaultParamID = diag::warn_param_default_argument_redefinition; 446 Invalid = false; 447 } 448 } 449 450 // FIXME: If we knew where the '=' was, we could easily provide a fix-it 451 // hint here. Alternatively, we could walk the type-source information 452 // for NewParam to find the last source location in the type... but it 453 // isn't worth the effort right now. This is the kind of test case that 454 // is hard to get right: 455 // int f(int); 456 // void g(int (*fp)(int) = f); 457 // void g(int (*fp)(int) = &f); 458 Diag(NewParam->getLocation(), DiagDefaultParamID) 459 << NewParam->getDefaultArgRange(); 460 461 // Look for the function declaration where the default argument was 462 // actually written, which may be a declaration prior to Old. 463 for (FunctionDecl *Older = Old->getPreviousDecl(); 464 Older; Older = Older->getPreviousDecl()) { 465 if (!Older->getParamDecl(p)->hasDefaultArg()) 466 break; 467 468 OldParam = Older->getParamDecl(p); 469 } 470 471 Diag(OldParam->getLocation(), diag::note_previous_definition) 472 << OldParam->getDefaultArgRange(); 473 } else if (OldParamHasDfl) { 474 // Merge the old default argument into the new parameter. 475 // It's important to use getInit() here; getDefaultArg() 476 // strips off any top-level ExprWithCleanups. 477 NewParam->setHasInheritedDefaultArg(); 478 if (OldParam->hasUninstantiatedDefaultArg()) 479 NewParam->setUninstantiatedDefaultArg( 480 OldParam->getUninstantiatedDefaultArg()); 481 else 482 NewParam->setDefaultArg(OldParam->getInit()); 483 } else if (NewParamHasDfl) { 484 if (New->getDescribedFunctionTemplate()) { 485 // Paragraph 4, quoted above, only applies to non-template functions. 486 Diag(NewParam->getLocation(), 487 diag::err_param_default_argument_template_redecl) 488 << NewParam->getDefaultArgRange(); 489 Diag(Old->getLocation(), diag::note_template_prev_declaration) 490 << false; 491 } else if (New->getTemplateSpecializationKind() 492 != TSK_ImplicitInstantiation && 493 New->getTemplateSpecializationKind() != TSK_Undeclared) { 494 // C++ [temp.expr.spec]p21: 495 // Default function arguments shall not be specified in a declaration 496 // or a definition for one of the following explicit specializations: 497 // - the explicit specialization of a function template; 498 // - the explicit specialization of a member function template; 499 // - the explicit specialization of a member function of a class 500 // template where the class template specialization to which the 501 // member function specialization belongs is implicitly 502 // instantiated. 503 Diag(NewParam->getLocation(), diag::err_template_spec_default_arg) 504 << (New->getTemplateSpecializationKind() ==TSK_ExplicitSpecialization) 505 << New->getDeclName() 506 << NewParam->getDefaultArgRange(); 507 } else if (New->getDeclContext()->isDependentContext()) { 508 // C++ [dcl.fct.default]p6 (DR217): 509 // Default arguments for a member function of a class template shall 510 // be specified on the initial declaration of the member function 511 // within the class template. 512 // 513 // Reading the tea leaves a bit in DR217 and its reference to DR205 514 // leads me to the conclusion that one cannot add default function 515 // arguments for an out-of-line definition of a member function of a 516 // dependent type. 517 int WhichKind = 2; 518 if (CXXRecordDecl *Record 519 = dyn_cast<CXXRecordDecl>(New->getDeclContext())) { 520 if (Record->getDescribedClassTemplate()) 521 WhichKind = 0; 522 else if (isa<ClassTemplatePartialSpecializationDecl>(Record)) 523 WhichKind = 1; 524 else 525 WhichKind = 2; 526 } 527 528 Diag(NewParam->getLocation(), 529 diag::err_param_default_argument_member_template_redecl) 530 << WhichKind 531 << NewParam->getDefaultArgRange(); 532 } 533 } 534 } 535 536 // DR1344: If a default argument is added outside a class definition and that 537 // default argument makes the function a special member function, the program 538 // is ill-formed. This can only happen for constructors. 539 if (isa<CXXConstructorDecl>(New) && 540 New->getMinRequiredArguments() < Old->getMinRequiredArguments()) { 541 CXXSpecialMember NewSM = getSpecialMember(cast<CXXMethodDecl>(New)), 542 OldSM = getSpecialMember(cast<CXXMethodDecl>(Old)); 543 if (NewSM != OldSM) { 544 ParmVarDecl *NewParam = New->getParamDecl(New->getMinRequiredArguments()); 545 assert(NewParam->hasDefaultArg()); 546 Diag(NewParam->getLocation(), diag::err_default_arg_makes_ctor_special) 547 << NewParam->getDefaultArgRange() << NewSM; 548 Diag(Old->getLocation(), diag::note_previous_declaration); 549 } 550 } 551 552 // C++11 [dcl.constexpr]p1: If any declaration of a function or function 553 // template has a constexpr specifier then all its declarations shall 554 // contain the constexpr specifier. 555 if (New->isConstexpr() != Old->isConstexpr()) { 556 Diag(New->getLocation(), diag::err_constexpr_redecl_mismatch) 557 << New << New->isConstexpr(); 558 Diag(Old->getLocation(), diag::note_previous_declaration); 559 Invalid = true; 560 } 561 562 if (CheckEquivalentExceptionSpec(Old, New)) 563 Invalid = true; 564 565 return Invalid; 566} 567 568/// \brief Merge the exception specifications of two variable declarations. 569/// 570/// This is called when there's a redeclaration of a VarDecl. The function 571/// checks if the redeclaration might have an exception specification and 572/// validates compatibility and merges the specs if necessary. 573void Sema::MergeVarDeclExceptionSpecs(VarDecl *New, VarDecl *Old) { 574 // Shortcut if exceptions are disabled. 575 if (!getLangOpts().CXXExceptions) 576 return; 577 578 assert(Context.hasSameType(New->getType(), Old->getType()) && 579 "Should only be called if types are otherwise the same."); 580 581 QualType NewType = New->getType(); 582 QualType OldType = Old->getType(); 583 584 // We're only interested in pointers and references to functions, as well 585 // as pointers to member functions. 586 if (const ReferenceType *R = NewType->getAs<ReferenceType>()) { 587 NewType = R->getPointeeType(); 588 OldType = OldType->getAs<ReferenceType>()->getPointeeType(); 589 } else if (const PointerType *P = NewType->getAs<PointerType>()) { 590 NewType = P->getPointeeType(); 591 OldType = OldType->getAs<PointerType>()->getPointeeType(); 592 } else if (const MemberPointerType *M = NewType->getAs<MemberPointerType>()) { 593 NewType = M->getPointeeType(); 594 OldType = OldType->getAs<MemberPointerType>()->getPointeeType(); 595 } 596 597 if (!NewType->isFunctionProtoType()) 598 return; 599 600 // There's lots of special cases for functions. For function pointers, system 601 // libraries are hopefully not as broken so that we don't need these 602 // workarounds. 603 if (CheckEquivalentExceptionSpec( 604 OldType->getAs<FunctionProtoType>(), Old->getLocation(), 605 NewType->getAs<FunctionProtoType>(), New->getLocation())) { 606 New->setInvalidDecl(); 607 } 608} 609 610/// CheckCXXDefaultArguments - Verify that the default arguments for a 611/// function declaration are well-formed according to C++ 612/// [dcl.fct.default]. 613void Sema::CheckCXXDefaultArguments(FunctionDecl *FD) { 614 unsigned NumParams = FD->getNumParams(); 615 unsigned p; 616 617 bool IsLambda = FD->getOverloadedOperator() == OO_Call && 618 isa<CXXMethodDecl>(FD) && 619 cast<CXXMethodDecl>(FD)->getParent()->isLambda(); 620 621 // Find first parameter with a default argument 622 for (p = 0; p < NumParams; ++p) { 623 ParmVarDecl *Param = FD->getParamDecl(p); 624 if (Param->hasDefaultArg()) { 625 // C++11 [expr.prim.lambda]p5: 626 // [...] Default arguments (8.3.6) shall not be specified in the 627 // parameter-declaration-clause of a lambda-declarator. 628 // 629 // FIXME: Core issue 974 strikes this sentence, we only provide an 630 // extension warning. 631 if (IsLambda) 632 Diag(Param->getLocation(), diag::ext_lambda_default_arguments) 633 << Param->getDefaultArgRange(); 634 break; 635 } 636 } 637 638 // C++ [dcl.fct.default]p4: 639 // In a given function declaration, all parameters 640 // subsequent to a parameter with a default argument shall 641 // have default arguments supplied in this or previous 642 // declarations. A default argument shall not be redefined 643 // by a later declaration (not even to the same value). 644 unsigned LastMissingDefaultArg = 0; 645 for (; p < NumParams; ++p) { 646 ParmVarDecl *Param = FD->getParamDecl(p); 647 if (!Param->hasDefaultArg()) { 648 if (Param->isInvalidDecl()) 649 /* We already complained about this parameter. */; 650 else if (Param->getIdentifier()) 651 Diag(Param->getLocation(), 652 diag::err_param_default_argument_missing_name) 653 << Param->getIdentifier(); 654 else 655 Diag(Param->getLocation(), 656 diag::err_param_default_argument_missing); 657 658 LastMissingDefaultArg = p; 659 } 660 } 661 662 if (LastMissingDefaultArg > 0) { 663 // Some default arguments were missing. Clear out all of the 664 // default arguments up to (and including) the last missing 665 // default argument, so that we leave the function parameters 666 // in a semantically valid state. 667 for (p = 0; p <= LastMissingDefaultArg; ++p) { 668 ParmVarDecl *Param = FD->getParamDecl(p); 669 if (Param->hasDefaultArg()) { 670 Param->setDefaultArg(0); 671 } 672 } 673 } 674} 675 676// CheckConstexprParameterTypes - Check whether a function's parameter types 677// are all literal types. If so, return true. If not, produce a suitable 678// diagnostic and return false. 679static bool CheckConstexprParameterTypes(Sema &SemaRef, 680 const FunctionDecl *FD) { 681 unsigned ArgIndex = 0; 682 const FunctionProtoType *FT = FD->getType()->getAs<FunctionProtoType>(); 683 for (FunctionProtoType::arg_type_iterator i = FT->arg_type_begin(), 684 e = FT->arg_type_end(); i != e; ++i, ++ArgIndex) { 685 const ParmVarDecl *PD = FD->getParamDecl(ArgIndex); 686 SourceLocation ParamLoc = PD->getLocation(); 687 if (!(*i)->isDependentType() && 688 SemaRef.RequireLiteralType(ParamLoc, *i, 689 diag::err_constexpr_non_literal_param, 690 ArgIndex+1, PD->getSourceRange(), 691 isa<CXXConstructorDecl>(FD))) 692 return false; 693 } 694 return true; 695} 696 697/// \brief Get diagnostic %select index for tag kind for 698/// record diagnostic message. 699/// WARNING: Indexes apply to particular diagnostics only! 700/// 701/// \returns diagnostic %select index. 702static unsigned getRecordDiagFromTagKind(TagTypeKind Tag) { 703 switch (Tag) { 704 case TTK_Struct: return 0; 705 case TTK_Interface: return 1; 706 case TTK_Class: return 2; 707 default: llvm_unreachable("Invalid tag kind for record diagnostic!"); 708 } 709} 710 711// CheckConstexprFunctionDecl - Check whether a function declaration satisfies 712// the requirements of a constexpr function definition or a constexpr 713// constructor definition. If so, return true. If not, produce appropriate 714// diagnostics and return false. 715// 716// This implements C++11 [dcl.constexpr]p3,4, as amended by DR1360. 717bool Sema::CheckConstexprFunctionDecl(const FunctionDecl *NewFD) { 718 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewFD); 719 if (MD && MD->isInstance()) { 720 // C++11 [dcl.constexpr]p4: 721 // The definition of a constexpr constructor shall satisfy the following 722 // constraints: 723 // - the class shall not have any virtual base classes; 724 const CXXRecordDecl *RD = MD->getParent(); 725 if (RD->getNumVBases()) { 726 Diag(NewFD->getLocation(), diag::err_constexpr_virtual_base) 727 << isa<CXXConstructorDecl>(NewFD) 728 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 729 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 730 E = RD->vbases_end(); I != E; ++I) 731 Diag(I->getLocStart(), 732 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 733 return false; 734 } 735 } 736 737 if (!isa<CXXConstructorDecl>(NewFD)) { 738 // C++11 [dcl.constexpr]p3: 739 // The definition of a constexpr function shall satisfy the following 740 // constraints: 741 // - it shall not be virtual; 742 const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD); 743 if (Method && Method->isVirtual()) { 744 Diag(NewFD->getLocation(), diag::err_constexpr_virtual); 745 746 // If it's not obvious why this function is virtual, find an overridden 747 // function which uses the 'virtual' keyword. 748 const CXXMethodDecl *WrittenVirtual = Method; 749 while (!WrittenVirtual->isVirtualAsWritten()) 750 WrittenVirtual = *WrittenVirtual->begin_overridden_methods(); 751 if (WrittenVirtual != Method) 752 Diag(WrittenVirtual->getLocation(), 753 diag::note_overridden_virtual_function); 754 return false; 755 } 756 757 // - its return type shall be a literal type; 758 QualType RT = NewFD->getResultType(); 759 if (!RT->isDependentType() && 760 RequireLiteralType(NewFD->getLocation(), RT, 761 diag::err_constexpr_non_literal_return)) 762 return false; 763 } 764 765 // - each of its parameter types shall be a literal type; 766 if (!CheckConstexprParameterTypes(*this, NewFD)) 767 return false; 768 769 return true; 770} 771 772/// Check the given declaration statement is legal within a constexpr function 773/// body. C++0x [dcl.constexpr]p3,p4. 774/// 775/// \return true if the body is OK, false if we have diagnosed a problem. 776static bool CheckConstexprDeclStmt(Sema &SemaRef, const FunctionDecl *Dcl, 777 DeclStmt *DS) { 778 // C++0x [dcl.constexpr]p3 and p4: 779 // The definition of a constexpr function(p3) or constructor(p4) [...] shall 780 // contain only 781 for (DeclStmt::decl_iterator DclIt = DS->decl_begin(), 782 DclEnd = DS->decl_end(); DclIt != DclEnd; ++DclIt) { 783 switch ((*DclIt)->getKind()) { 784 case Decl::StaticAssert: 785 case Decl::Using: 786 case Decl::UsingShadow: 787 case Decl::UsingDirective: 788 case Decl::UnresolvedUsingTypename: 789 // - static_assert-declarations 790 // - using-declarations, 791 // - using-directives, 792 continue; 793 794 case Decl::Typedef: 795 case Decl::TypeAlias: { 796 // - typedef declarations and alias-declarations that do not define 797 // classes or enumerations, 798 TypedefNameDecl *TN = cast<TypedefNameDecl>(*DclIt); 799 if (TN->getUnderlyingType()->isVariablyModifiedType()) { 800 // Don't allow variably-modified types in constexpr functions. 801 TypeLoc TL = TN->getTypeSourceInfo()->getTypeLoc(); 802 SemaRef.Diag(TL.getBeginLoc(), diag::err_constexpr_vla) 803 << TL.getSourceRange() << TL.getType() 804 << isa<CXXConstructorDecl>(Dcl); 805 return false; 806 } 807 continue; 808 } 809 810 case Decl::Enum: 811 case Decl::CXXRecord: 812 // As an extension, we allow the declaration (but not the definition) of 813 // classes and enumerations in all declarations, not just in typedef and 814 // alias declarations. 815 if (cast<TagDecl>(*DclIt)->isThisDeclarationADefinition()) { 816 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_type_definition) 817 << isa<CXXConstructorDecl>(Dcl); 818 return false; 819 } 820 continue; 821 822 case Decl::Var: 823 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_var_declaration) 824 << isa<CXXConstructorDecl>(Dcl); 825 return false; 826 827 default: 828 SemaRef.Diag(DS->getLocStart(), diag::err_constexpr_body_invalid_stmt) 829 << isa<CXXConstructorDecl>(Dcl); 830 return false; 831 } 832 } 833 834 return true; 835} 836 837/// Check that the given field is initialized within a constexpr constructor. 838/// 839/// \param Dcl The constexpr constructor being checked. 840/// \param Field The field being checked. This may be a member of an anonymous 841/// struct or union nested within the class being checked. 842/// \param Inits All declarations, including anonymous struct/union members and 843/// indirect members, for which any initialization was provided. 844/// \param Diagnosed Set to true if an error is produced. 845static void CheckConstexprCtorInitializer(Sema &SemaRef, 846 const FunctionDecl *Dcl, 847 FieldDecl *Field, 848 llvm::SmallSet<Decl*, 16> &Inits, 849 bool &Diagnosed) { 850 if (Field->isUnnamedBitfield()) 851 return; 852 853 if (Field->isAnonymousStructOrUnion() && 854 Field->getType()->getAsCXXRecordDecl()->isEmpty()) 855 return; 856 857 if (!Inits.count(Field)) { 858 if (!Diagnosed) { 859 SemaRef.Diag(Dcl->getLocation(), diag::err_constexpr_ctor_missing_init); 860 Diagnosed = true; 861 } 862 SemaRef.Diag(Field->getLocation(), diag::note_constexpr_ctor_missing_init); 863 } else if (Field->isAnonymousStructOrUnion()) { 864 const RecordDecl *RD = Field->getType()->castAs<RecordType>()->getDecl(); 865 for (RecordDecl::field_iterator I = RD->field_begin(), E = RD->field_end(); 866 I != E; ++I) 867 // If an anonymous union contains an anonymous struct of which any member 868 // is initialized, all members must be initialized. 869 if (!RD->isUnion() || Inits.count(*I)) 870 CheckConstexprCtorInitializer(SemaRef, Dcl, *I, Inits, Diagnosed); 871 } 872} 873 874/// Check the body for the given constexpr function declaration only contains 875/// the permitted types of statement. C++11 [dcl.constexpr]p3,p4. 876/// 877/// \return true if the body is OK, false if we have diagnosed a problem. 878bool Sema::CheckConstexprFunctionBody(const FunctionDecl *Dcl, Stmt *Body) { 879 if (isa<CXXTryStmt>(Body)) { 880 // C++11 [dcl.constexpr]p3: 881 // The definition of a constexpr function shall satisfy the following 882 // constraints: [...] 883 // - its function-body shall be = delete, = default, or a 884 // compound-statement 885 // 886 // C++11 [dcl.constexpr]p4: 887 // In the definition of a constexpr constructor, [...] 888 // - its function-body shall not be a function-try-block; 889 Diag(Body->getLocStart(), diag::err_constexpr_function_try_block) 890 << isa<CXXConstructorDecl>(Dcl); 891 return false; 892 } 893 894 // - its function-body shall be [...] a compound-statement that contains only 895 CompoundStmt *CompBody = cast<CompoundStmt>(Body); 896 897 SmallVector<SourceLocation, 4> ReturnStmts; 898 for (CompoundStmt::body_iterator BodyIt = CompBody->body_begin(), 899 BodyEnd = CompBody->body_end(); BodyIt != BodyEnd; ++BodyIt) { 900 switch ((*BodyIt)->getStmtClass()) { 901 case Stmt::NullStmtClass: 902 // - null statements, 903 continue; 904 905 case Stmt::DeclStmtClass: 906 // - static_assert-declarations 907 // - using-declarations, 908 // - using-directives, 909 // - typedef declarations and alias-declarations that do not define 910 // classes or enumerations, 911 if (!CheckConstexprDeclStmt(*this, Dcl, cast<DeclStmt>(*BodyIt))) 912 return false; 913 continue; 914 915 case Stmt::ReturnStmtClass: 916 // - and exactly one return statement; 917 if (isa<CXXConstructorDecl>(Dcl)) 918 break; 919 920 ReturnStmts.push_back((*BodyIt)->getLocStart()); 921 continue; 922 923 default: 924 break; 925 } 926 927 Diag((*BodyIt)->getLocStart(), diag::err_constexpr_body_invalid_stmt) 928 << isa<CXXConstructorDecl>(Dcl); 929 return false; 930 } 931 932 if (const CXXConstructorDecl *Constructor 933 = dyn_cast<CXXConstructorDecl>(Dcl)) { 934 const CXXRecordDecl *RD = Constructor->getParent(); 935 // DR1359: 936 // - every non-variant non-static data member and base class sub-object 937 // shall be initialized; 938 // - if the class is a non-empty union, or for each non-empty anonymous 939 // union member of a non-union class, exactly one non-static data member 940 // shall be initialized; 941 if (RD->isUnion()) { 942 if (Constructor->getNumCtorInitializers() == 0 && !RD->isEmpty()) { 943 Diag(Dcl->getLocation(), diag::err_constexpr_union_ctor_no_init); 944 return false; 945 } 946 } else if (!Constructor->isDependentContext() && 947 !Constructor->isDelegatingConstructor()) { 948 assert(RD->getNumVBases() == 0 && "constexpr ctor with virtual bases"); 949 950 // Skip detailed checking if we have enough initializers, and we would 951 // allow at most one initializer per member. 952 bool AnyAnonStructUnionMembers = false; 953 unsigned Fields = 0; 954 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 955 E = RD->field_end(); I != E; ++I, ++Fields) { 956 if (I->isAnonymousStructOrUnion()) { 957 AnyAnonStructUnionMembers = true; 958 break; 959 } 960 } 961 if (AnyAnonStructUnionMembers || 962 Constructor->getNumCtorInitializers() != RD->getNumBases() + Fields) { 963 // Check initialization of non-static data members. Base classes are 964 // always initialized so do not need to be checked. Dependent bases 965 // might not have initializers in the member initializer list. 966 llvm::SmallSet<Decl*, 16> Inits; 967 for (CXXConstructorDecl::init_const_iterator 968 I = Constructor->init_begin(), E = Constructor->init_end(); 969 I != E; ++I) { 970 if (FieldDecl *FD = (*I)->getMember()) 971 Inits.insert(FD); 972 else if (IndirectFieldDecl *ID = (*I)->getIndirectMember()) 973 Inits.insert(ID->chain_begin(), ID->chain_end()); 974 } 975 976 bool Diagnosed = false; 977 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 978 E = RD->field_end(); I != E; ++I) 979 CheckConstexprCtorInitializer(*this, Dcl, *I, Inits, Diagnosed); 980 if (Diagnosed) 981 return false; 982 } 983 } 984 } else { 985 if (ReturnStmts.empty()) { 986 Diag(Dcl->getLocation(), diag::err_constexpr_body_no_return); 987 return false; 988 } 989 if (ReturnStmts.size() > 1) { 990 Diag(ReturnStmts.back(), diag::err_constexpr_body_multiple_return); 991 for (unsigned I = 0; I < ReturnStmts.size() - 1; ++I) 992 Diag(ReturnStmts[I], diag::note_constexpr_body_previous_return); 993 return false; 994 } 995 } 996 997 // C++11 [dcl.constexpr]p5: 998 // if no function argument values exist such that the function invocation 999 // substitution would produce a constant expression, the program is 1000 // ill-formed; no diagnostic required. 1001 // C++11 [dcl.constexpr]p3: 1002 // - every constructor call and implicit conversion used in initializing the 1003 // return value shall be one of those allowed in a constant expression. 1004 // C++11 [dcl.constexpr]p4: 1005 // - every constructor involved in initializing non-static data members and 1006 // base class sub-objects shall be a constexpr constructor. 1007 SmallVector<PartialDiagnosticAt, 8> Diags; 1008 if (!Expr::isPotentialConstantExpr(Dcl, Diags)) { 1009 Diag(Dcl->getLocation(), diag::ext_constexpr_function_never_constant_expr) 1010 << isa<CXXConstructorDecl>(Dcl); 1011 for (size_t I = 0, N = Diags.size(); I != N; ++I) 1012 Diag(Diags[I].first, Diags[I].second); 1013 // Don't return false here: we allow this for compatibility in 1014 // system headers. 1015 } 1016 1017 return true; 1018} 1019 1020/// isCurrentClassName - Determine whether the identifier II is the 1021/// name of the class type currently being defined. In the case of 1022/// nested classes, this will only return true if II is the name of 1023/// the innermost class. 1024bool Sema::isCurrentClassName(const IdentifierInfo &II, Scope *, 1025 const CXXScopeSpec *SS) { 1026 assert(getLangOpts().CPlusPlus && "No class names in C!"); 1027 1028 CXXRecordDecl *CurDecl; 1029 if (SS && SS->isSet() && !SS->isInvalid()) { 1030 DeclContext *DC = computeDeclContext(*SS, true); 1031 CurDecl = dyn_cast_or_null<CXXRecordDecl>(DC); 1032 } else 1033 CurDecl = dyn_cast_or_null<CXXRecordDecl>(CurContext); 1034 1035 if (CurDecl && CurDecl->getIdentifier()) 1036 return &II == CurDecl->getIdentifier(); 1037 else 1038 return false; 1039} 1040 1041/// \brief Determine whether the given class is a base class of the given 1042/// class, including looking at dependent bases. 1043static bool findCircularInheritance(const CXXRecordDecl *Class, 1044 const CXXRecordDecl *Current) { 1045 SmallVector<const CXXRecordDecl*, 8> Queue; 1046 1047 Class = Class->getCanonicalDecl(); 1048 while (true) { 1049 for (CXXRecordDecl::base_class_const_iterator I = Current->bases_begin(), 1050 E = Current->bases_end(); 1051 I != E; ++I) { 1052 CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl(); 1053 if (!Base) 1054 continue; 1055 1056 Base = Base->getDefinition(); 1057 if (!Base) 1058 continue; 1059 1060 if (Base->getCanonicalDecl() == Class) 1061 return true; 1062 1063 Queue.push_back(Base); 1064 } 1065 1066 if (Queue.empty()) 1067 return false; 1068 1069 Current = Queue.back(); 1070 Queue.pop_back(); 1071 } 1072 1073 return false; 1074} 1075 1076/// \brief Check the validity of a C++ base class specifier. 1077/// 1078/// \returns a new CXXBaseSpecifier if well-formed, emits diagnostics 1079/// and returns NULL otherwise. 1080CXXBaseSpecifier * 1081Sema::CheckBaseSpecifier(CXXRecordDecl *Class, 1082 SourceRange SpecifierRange, 1083 bool Virtual, AccessSpecifier Access, 1084 TypeSourceInfo *TInfo, 1085 SourceLocation EllipsisLoc) { 1086 QualType BaseType = TInfo->getType(); 1087 1088 // C++ [class.union]p1: 1089 // A union shall not have base classes. 1090 if (Class->isUnion()) { 1091 Diag(Class->getLocation(), diag::err_base_clause_on_union) 1092 << SpecifierRange; 1093 return 0; 1094 } 1095 1096 if (EllipsisLoc.isValid() && 1097 !TInfo->getType()->containsUnexpandedParameterPack()) { 1098 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 1099 << TInfo->getTypeLoc().getSourceRange(); 1100 EllipsisLoc = SourceLocation(); 1101 } 1102 1103 SourceLocation BaseLoc = TInfo->getTypeLoc().getBeginLoc(); 1104 1105 if (BaseType->isDependentType()) { 1106 // Make sure that we don't have circular inheritance among our dependent 1107 // bases. For non-dependent bases, the check for completeness below handles 1108 // this. 1109 if (CXXRecordDecl *BaseDecl = BaseType->getAsCXXRecordDecl()) { 1110 if (BaseDecl->getCanonicalDecl() == Class->getCanonicalDecl() || 1111 ((BaseDecl = BaseDecl->getDefinition()) && 1112 findCircularInheritance(Class, BaseDecl))) { 1113 Diag(BaseLoc, diag::err_circular_inheritance) 1114 << BaseType << Context.getTypeDeclType(Class); 1115 1116 if (BaseDecl->getCanonicalDecl() != Class->getCanonicalDecl()) 1117 Diag(BaseDecl->getLocation(), diag::note_previous_decl) 1118 << BaseType; 1119 1120 return 0; 1121 } 1122 } 1123 1124 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1125 Class->getTagKind() == TTK_Class, 1126 Access, TInfo, EllipsisLoc); 1127 } 1128 1129 // Base specifiers must be record types. 1130 if (!BaseType->isRecordType()) { 1131 Diag(BaseLoc, diag::err_base_must_be_class) << SpecifierRange; 1132 return 0; 1133 } 1134 1135 // C++ [class.union]p1: 1136 // A union shall not be used as a base class. 1137 if (BaseType->isUnionType()) { 1138 Diag(BaseLoc, diag::err_union_as_base_class) << SpecifierRange; 1139 return 0; 1140 } 1141 1142 // C++ [class.derived]p2: 1143 // The class-name in a base-specifier shall not be an incompletely 1144 // defined class. 1145 if (RequireCompleteType(BaseLoc, BaseType, 1146 diag::err_incomplete_base_class, SpecifierRange)) { 1147 Class->setInvalidDecl(); 1148 return 0; 1149 } 1150 1151 // If the base class is polymorphic or isn't empty, the new one is/isn't, too. 1152 RecordDecl *BaseDecl = BaseType->getAs<RecordType>()->getDecl(); 1153 assert(BaseDecl && "Record type has no declaration"); 1154 BaseDecl = BaseDecl->getDefinition(); 1155 assert(BaseDecl && "Base type is not incomplete, but has no definition"); 1156 CXXRecordDecl * CXXBaseDecl = cast<CXXRecordDecl>(BaseDecl); 1157 assert(CXXBaseDecl && "Base type is not a C++ type"); 1158 1159 // C++ [class]p3: 1160 // If a class is marked final and it appears as a base-type-specifier in 1161 // base-clause, the program is ill-formed. 1162 if (CXXBaseDecl->hasAttr<FinalAttr>()) { 1163 Diag(BaseLoc, diag::err_class_marked_final_used_as_base) 1164 << CXXBaseDecl->getDeclName(); 1165 Diag(CXXBaseDecl->getLocation(), diag::note_previous_decl) 1166 << CXXBaseDecl->getDeclName(); 1167 return 0; 1168 } 1169 1170 if (BaseDecl->isInvalidDecl()) 1171 Class->setInvalidDecl(); 1172 1173 // Create the base specifier. 1174 return new (Context) CXXBaseSpecifier(SpecifierRange, Virtual, 1175 Class->getTagKind() == TTK_Class, 1176 Access, TInfo, EllipsisLoc); 1177} 1178 1179/// ActOnBaseSpecifier - Parsed a base specifier. A base specifier is 1180/// one entry in the base class list of a class specifier, for 1181/// example: 1182/// class foo : public bar, virtual private baz { 1183/// 'public bar' and 'virtual private baz' are each base-specifiers. 1184BaseResult 1185Sema::ActOnBaseSpecifier(Decl *classdecl, SourceRange SpecifierRange, 1186 ParsedAttributes &Attributes, 1187 bool Virtual, AccessSpecifier Access, 1188 ParsedType basetype, SourceLocation BaseLoc, 1189 SourceLocation EllipsisLoc) { 1190 if (!classdecl) 1191 return true; 1192 1193 AdjustDeclIfTemplate(classdecl); 1194 CXXRecordDecl *Class = dyn_cast<CXXRecordDecl>(classdecl); 1195 if (!Class) 1196 return true; 1197 1198 // We do not support any C++11 attributes on base-specifiers yet. 1199 // Diagnose any attributes we see. 1200 if (!Attributes.empty()) { 1201 for (AttributeList *Attr = Attributes.getList(); Attr; 1202 Attr = Attr->getNext()) { 1203 if (Attr->isInvalid() || 1204 Attr->getKind() == AttributeList::IgnoredAttribute) 1205 continue; 1206 Diag(Attr->getLoc(), 1207 Attr->getKind() == AttributeList::UnknownAttribute 1208 ? diag::warn_unknown_attribute_ignored 1209 : diag::err_base_specifier_attribute) 1210 << Attr->getName(); 1211 } 1212 } 1213 1214 TypeSourceInfo *TInfo = 0; 1215 GetTypeFromParser(basetype, &TInfo); 1216 1217 if (EllipsisLoc.isInvalid() && 1218 DiagnoseUnexpandedParameterPack(SpecifierRange.getBegin(), TInfo, 1219 UPPC_BaseType)) 1220 return true; 1221 1222 if (CXXBaseSpecifier *BaseSpec = CheckBaseSpecifier(Class, SpecifierRange, 1223 Virtual, Access, TInfo, 1224 EllipsisLoc)) 1225 return BaseSpec; 1226 else 1227 Class->setInvalidDecl(); 1228 1229 return true; 1230} 1231 1232/// \brief Performs the actual work of attaching the given base class 1233/// specifiers to a C++ class. 1234bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases, 1235 unsigned NumBases) { 1236 if (NumBases == 0) 1237 return false; 1238 1239 // Used to keep track of which base types we have already seen, so 1240 // that we can properly diagnose redundant direct base types. Note 1241 // that the key is always the unqualified canonical type of the base 1242 // class. 1243 std::map<QualType, CXXBaseSpecifier*, QualTypeOrdering> KnownBaseTypes; 1244 1245 // Copy non-redundant base specifiers into permanent storage. 1246 unsigned NumGoodBases = 0; 1247 bool Invalid = false; 1248 for (unsigned idx = 0; idx < NumBases; ++idx) { 1249 QualType NewBaseType 1250 = Context.getCanonicalType(Bases[idx]->getType()); 1251 NewBaseType = NewBaseType.getLocalUnqualifiedType(); 1252 1253 CXXBaseSpecifier *&KnownBase = KnownBaseTypes[NewBaseType]; 1254 if (KnownBase) { 1255 // C++ [class.mi]p3: 1256 // A class shall not be specified as a direct base class of a 1257 // derived class more than once. 1258 Diag(Bases[idx]->getLocStart(), 1259 diag::err_duplicate_base_class) 1260 << KnownBase->getType() 1261 << Bases[idx]->getSourceRange(); 1262 1263 // Delete the duplicate base class specifier; we're going to 1264 // overwrite its pointer later. 1265 Context.Deallocate(Bases[idx]); 1266 1267 Invalid = true; 1268 } else { 1269 // Okay, add this new base class. 1270 KnownBase = Bases[idx]; 1271 Bases[NumGoodBases++] = Bases[idx]; 1272 if (const RecordType *Record = NewBaseType->getAs<RecordType>()) { 1273 const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()); 1274 if (Class->isInterface() && 1275 (!RD->isInterface() || 1276 KnownBase->getAccessSpecifier() != AS_public)) { 1277 // The Microsoft extension __interface does not permit bases that 1278 // are not themselves public interfaces. 1279 Diag(KnownBase->getLocStart(), diag::err_invalid_base_in_interface) 1280 << getRecordDiagFromTagKind(RD->getTagKind()) << RD->getName() 1281 << RD->getSourceRange(); 1282 Invalid = true; 1283 } 1284 if (RD->hasAttr<WeakAttr>()) 1285 Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context)); 1286 } 1287 } 1288 } 1289 1290 // Attach the remaining base class specifiers to the derived class. 1291 Class->setBases(Bases, NumGoodBases); 1292 1293 // Delete the remaining (good) base class specifiers, since their 1294 // data has been copied into the CXXRecordDecl. 1295 for (unsigned idx = 0; idx < NumGoodBases; ++idx) 1296 Context.Deallocate(Bases[idx]); 1297 1298 return Invalid; 1299} 1300 1301/// ActOnBaseSpecifiers - Attach the given base specifiers to the 1302/// class, after checking whether there are any duplicate base 1303/// classes. 1304void Sema::ActOnBaseSpecifiers(Decl *ClassDecl, CXXBaseSpecifier **Bases, 1305 unsigned NumBases) { 1306 if (!ClassDecl || !Bases || !NumBases) 1307 return; 1308 1309 AdjustDeclIfTemplate(ClassDecl); 1310 AttachBaseSpecifiers(cast<CXXRecordDecl>(ClassDecl), 1311 (CXXBaseSpecifier**)(Bases), NumBases); 1312} 1313 1314/// \brief Determine whether the type \p Derived is a C++ class that is 1315/// derived from the type \p Base. 1316bool Sema::IsDerivedFrom(QualType Derived, QualType Base) { 1317 if (!getLangOpts().CPlusPlus) 1318 return false; 1319 1320 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1321 if (!DerivedRD) 1322 return false; 1323 1324 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1325 if (!BaseRD) 1326 return false; 1327 1328 // If either the base or the derived type is invalid, don't try to 1329 // check whether one is derived from the other. 1330 if (BaseRD->isInvalidDecl() || DerivedRD->isInvalidDecl()) 1331 return false; 1332 1333 // FIXME: instantiate DerivedRD if necessary. We need a PoI for this. 1334 return DerivedRD->hasDefinition() && DerivedRD->isDerivedFrom(BaseRD); 1335} 1336 1337/// \brief Determine whether the type \p Derived is a C++ class that is 1338/// derived from the type \p Base. 1339bool Sema::IsDerivedFrom(QualType Derived, QualType Base, CXXBasePaths &Paths) { 1340 if (!getLangOpts().CPlusPlus) 1341 return false; 1342 1343 CXXRecordDecl *DerivedRD = Derived->getAsCXXRecordDecl(); 1344 if (!DerivedRD) 1345 return false; 1346 1347 CXXRecordDecl *BaseRD = Base->getAsCXXRecordDecl(); 1348 if (!BaseRD) 1349 return false; 1350 1351 return DerivedRD->isDerivedFrom(BaseRD, Paths); 1352} 1353 1354void Sema::BuildBasePathArray(const CXXBasePaths &Paths, 1355 CXXCastPath &BasePathArray) { 1356 assert(BasePathArray.empty() && "Base path array must be empty!"); 1357 assert(Paths.isRecordingPaths() && "Must record paths!"); 1358 1359 const CXXBasePath &Path = Paths.front(); 1360 1361 // We first go backward and check if we have a virtual base. 1362 // FIXME: It would be better if CXXBasePath had the base specifier for 1363 // the nearest virtual base. 1364 unsigned Start = 0; 1365 for (unsigned I = Path.size(); I != 0; --I) { 1366 if (Path[I - 1].Base->isVirtual()) { 1367 Start = I - 1; 1368 break; 1369 } 1370 } 1371 1372 // Now add all bases. 1373 for (unsigned I = Start, E = Path.size(); I != E; ++I) 1374 BasePathArray.push_back(const_cast<CXXBaseSpecifier*>(Path[I].Base)); 1375} 1376 1377/// \brief Determine whether the given base path includes a virtual 1378/// base class. 1379bool Sema::BasePathInvolvesVirtualBase(const CXXCastPath &BasePath) { 1380 for (CXXCastPath::const_iterator B = BasePath.begin(), 1381 BEnd = BasePath.end(); 1382 B != BEnd; ++B) 1383 if ((*B)->isVirtual()) 1384 return true; 1385 1386 return false; 1387} 1388 1389/// CheckDerivedToBaseConversion - Check whether the Derived-to-Base 1390/// conversion (where Derived and Base are class types) is 1391/// well-formed, meaning that the conversion is unambiguous (and 1392/// that all of the base classes are accessible). Returns true 1393/// and emits a diagnostic if the code is ill-formed, returns false 1394/// otherwise. Loc is the location where this routine should point to 1395/// if there is an error, and Range is the source range to highlight 1396/// if there is an error. 1397bool 1398Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1399 unsigned InaccessibleBaseID, 1400 unsigned AmbigiousBaseConvID, 1401 SourceLocation Loc, SourceRange Range, 1402 DeclarationName Name, 1403 CXXCastPath *BasePath) { 1404 // First, determine whether the path from Derived to Base is 1405 // ambiguous. This is slightly more expensive than checking whether 1406 // the Derived to Base conversion exists, because here we need to 1407 // explore multiple paths to determine if there is an ambiguity. 1408 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 1409 /*DetectVirtual=*/false); 1410 bool DerivationOkay = IsDerivedFrom(Derived, Base, Paths); 1411 assert(DerivationOkay && 1412 "Can only be used with a derived-to-base conversion"); 1413 (void)DerivationOkay; 1414 1415 if (!Paths.isAmbiguous(Context.getCanonicalType(Base).getUnqualifiedType())) { 1416 if (InaccessibleBaseID) { 1417 // Check that the base class can be accessed. 1418 switch (CheckBaseClassAccess(Loc, Base, Derived, Paths.front(), 1419 InaccessibleBaseID)) { 1420 case AR_inaccessible: 1421 return true; 1422 case AR_accessible: 1423 case AR_dependent: 1424 case AR_delayed: 1425 break; 1426 } 1427 } 1428 1429 // Build a base path if necessary. 1430 if (BasePath) 1431 BuildBasePathArray(Paths, *BasePath); 1432 return false; 1433 } 1434 1435 // We know that the derived-to-base conversion is ambiguous, and 1436 // we're going to produce a diagnostic. Perform the derived-to-base 1437 // search just one more time to compute all of the possible paths so 1438 // that we can print them out. This is more expensive than any of 1439 // the previous derived-to-base checks we've done, but at this point 1440 // performance isn't as much of an issue. 1441 Paths.clear(); 1442 Paths.setRecordingPaths(true); 1443 bool StillOkay = IsDerivedFrom(Derived, Base, Paths); 1444 assert(StillOkay && "Can only be used with a derived-to-base conversion"); 1445 (void)StillOkay; 1446 1447 // Build up a textual representation of the ambiguous paths, e.g., 1448 // D -> B -> A, that will be used to illustrate the ambiguous 1449 // conversions in the diagnostic. We only print one of the paths 1450 // to each base class subobject. 1451 std::string PathDisplayStr = getAmbiguousPathsDisplayString(Paths); 1452 1453 Diag(Loc, AmbigiousBaseConvID) 1454 << Derived << Base << PathDisplayStr << Range << Name; 1455 return true; 1456} 1457 1458bool 1459Sema::CheckDerivedToBaseConversion(QualType Derived, QualType Base, 1460 SourceLocation Loc, SourceRange Range, 1461 CXXCastPath *BasePath, 1462 bool IgnoreAccess) { 1463 return CheckDerivedToBaseConversion(Derived, Base, 1464 IgnoreAccess ? 0 1465 : diag::err_upcast_to_inaccessible_base, 1466 diag::err_ambiguous_derived_to_base_conv, 1467 Loc, Range, DeclarationName(), 1468 BasePath); 1469} 1470 1471 1472/// @brief Builds a string representing ambiguous paths from a 1473/// specific derived class to different subobjects of the same base 1474/// class. 1475/// 1476/// This function builds a string that can be used in error messages 1477/// to show the different paths that one can take through the 1478/// inheritance hierarchy to go from the derived class to different 1479/// subobjects of a base class. The result looks something like this: 1480/// @code 1481/// struct D -> struct B -> struct A 1482/// struct D -> struct C -> struct A 1483/// @endcode 1484std::string Sema::getAmbiguousPathsDisplayString(CXXBasePaths &Paths) { 1485 std::string PathDisplayStr; 1486 std::set<unsigned> DisplayedPaths; 1487 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 1488 Path != Paths.end(); ++Path) { 1489 if (DisplayedPaths.insert(Path->back().SubobjectNumber).second) { 1490 // We haven't displayed a path to this particular base 1491 // class subobject yet. 1492 PathDisplayStr += "\n "; 1493 PathDisplayStr += Context.getTypeDeclType(Paths.getOrigin()).getAsString(); 1494 for (CXXBasePath::const_iterator Element = Path->begin(); 1495 Element != Path->end(); ++Element) 1496 PathDisplayStr += " -> " + Element->Base->getType().getAsString(); 1497 } 1498 } 1499 1500 return PathDisplayStr; 1501} 1502 1503//===----------------------------------------------------------------------===// 1504// C++ class member Handling 1505//===----------------------------------------------------------------------===// 1506 1507/// ActOnAccessSpecifier - Parsed an access specifier followed by a colon. 1508bool Sema::ActOnAccessSpecifier(AccessSpecifier Access, 1509 SourceLocation ASLoc, 1510 SourceLocation ColonLoc, 1511 AttributeList *Attrs) { 1512 assert(Access != AS_none && "Invalid kind for syntactic access specifier!"); 1513 AccessSpecDecl *ASDecl = AccessSpecDecl::Create(Context, Access, CurContext, 1514 ASLoc, ColonLoc); 1515 CurContext->addHiddenDecl(ASDecl); 1516 return ProcessAccessDeclAttributeList(ASDecl, Attrs); 1517} 1518 1519/// CheckOverrideControl - Check C++11 override control semantics. 1520void Sema::CheckOverrideControl(Decl *D) { 1521 if (D->isInvalidDecl()) 1522 return; 1523 1524 const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D); 1525 1526 // Do we know which functions this declaration might be overriding? 1527 bool OverridesAreKnown = !MD || 1528 (!MD->getParent()->hasAnyDependentBases() && 1529 !MD->getType()->isDependentType()); 1530 1531 if (!MD || !MD->isVirtual()) { 1532 if (OverridesAreKnown) { 1533 if (OverrideAttr *OA = D->getAttr<OverrideAttr>()) { 1534 Diag(OA->getLocation(), 1535 diag::override_keyword_only_allowed_on_virtual_member_functions) 1536 << "override" << FixItHint::CreateRemoval(OA->getLocation()); 1537 D->dropAttr<OverrideAttr>(); 1538 } 1539 if (FinalAttr *FA = D->getAttr<FinalAttr>()) { 1540 Diag(FA->getLocation(), 1541 diag::override_keyword_only_allowed_on_virtual_member_functions) 1542 << "final" << FixItHint::CreateRemoval(FA->getLocation()); 1543 D->dropAttr<FinalAttr>(); 1544 } 1545 } 1546 return; 1547 } 1548 1549 if (!OverridesAreKnown) 1550 return; 1551 1552 // C++11 [class.virtual]p5: 1553 // If a virtual function is marked with the virt-specifier override and 1554 // does not override a member function of a base class, the program is 1555 // ill-formed. 1556 bool HasOverriddenMethods = 1557 MD->begin_overridden_methods() != MD->end_overridden_methods(); 1558 if (MD->hasAttr<OverrideAttr>() && !HasOverriddenMethods) 1559 Diag(MD->getLocation(), diag::err_function_marked_override_not_overriding) 1560 << MD->getDeclName(); 1561} 1562 1563/// CheckIfOverriddenFunctionIsMarkedFinal - Checks whether a virtual member 1564/// function overrides a virtual member function marked 'final', according to 1565/// C++11 [class.virtual]p4. 1566bool Sema::CheckIfOverriddenFunctionIsMarkedFinal(const CXXMethodDecl *New, 1567 const CXXMethodDecl *Old) { 1568 if (!Old->hasAttr<FinalAttr>()) 1569 return false; 1570 1571 Diag(New->getLocation(), diag::err_final_function_overridden) 1572 << New->getDeclName(); 1573 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 1574 return true; 1575} 1576 1577static bool InitializationHasSideEffects(const FieldDecl &FD) { 1578 const Type *T = FD.getType()->getBaseElementTypeUnsafe(); 1579 // FIXME: Destruction of ObjC lifetime types has side-effects. 1580 if (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) 1581 return !RD->isCompleteDefinition() || 1582 !RD->hasTrivialDefaultConstructor() || 1583 !RD->hasTrivialDestructor(); 1584 return false; 1585} 1586 1587/// ActOnCXXMemberDeclarator - This is invoked when a C++ class member 1588/// declarator is parsed. 'AS' is the access specifier, 'BW' specifies the 1589/// bitfield width if there is one, 'InitExpr' specifies the initializer if 1590/// one has been parsed, and 'InitStyle' is set if an in-class initializer is 1591/// present (but parsing it has been deferred). 1592NamedDecl * 1593Sema::ActOnCXXMemberDeclarator(Scope *S, AccessSpecifier AS, Declarator &D, 1594 MultiTemplateParamsArg TemplateParameterLists, 1595 Expr *BW, const VirtSpecifiers &VS, 1596 InClassInitStyle InitStyle) { 1597 const DeclSpec &DS = D.getDeclSpec(); 1598 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 1599 DeclarationName Name = NameInfo.getName(); 1600 SourceLocation Loc = NameInfo.getLoc(); 1601 1602 // For anonymous bitfields, the location should point to the type. 1603 if (Loc.isInvalid()) 1604 Loc = D.getLocStart(); 1605 1606 Expr *BitWidth = static_cast<Expr*>(BW); 1607 1608 assert(isa<CXXRecordDecl>(CurContext)); 1609 assert(!DS.isFriendSpecified()); 1610 1611 bool isFunc = D.isDeclarationOfFunction(); 1612 1613 if (cast<CXXRecordDecl>(CurContext)->isInterface()) { 1614 // The Microsoft extension __interface only permits public member functions 1615 // and prohibits constructors, destructors, operators, non-public member 1616 // functions, static methods and data members. 1617 unsigned InvalidDecl; 1618 bool ShowDeclName = true; 1619 if (!isFunc) 1620 InvalidDecl = (DS.getStorageClassSpec() == DeclSpec::SCS_typedef) ? 0 : 1; 1621 else if (AS != AS_public) 1622 InvalidDecl = 2; 1623 else if (DS.getStorageClassSpec() == DeclSpec::SCS_static) 1624 InvalidDecl = 3; 1625 else switch (Name.getNameKind()) { 1626 case DeclarationName::CXXConstructorName: 1627 InvalidDecl = 4; 1628 ShowDeclName = false; 1629 break; 1630 1631 case DeclarationName::CXXDestructorName: 1632 InvalidDecl = 5; 1633 ShowDeclName = false; 1634 break; 1635 1636 case DeclarationName::CXXOperatorName: 1637 case DeclarationName::CXXConversionFunctionName: 1638 InvalidDecl = 6; 1639 break; 1640 1641 default: 1642 InvalidDecl = 0; 1643 break; 1644 } 1645 1646 if (InvalidDecl) { 1647 if (ShowDeclName) 1648 Diag(Loc, diag::err_invalid_member_in_interface) 1649 << (InvalidDecl-1) << Name; 1650 else 1651 Diag(Loc, diag::err_invalid_member_in_interface) 1652 << (InvalidDecl-1) << ""; 1653 return 0; 1654 } 1655 } 1656 1657 // C++ 9.2p6: A member shall not be declared to have automatic storage 1658 // duration (auto, register) or with the extern storage-class-specifier. 1659 // C++ 7.1.1p8: The mutable specifier can be applied only to names of class 1660 // data members and cannot be applied to names declared const or static, 1661 // and cannot be applied to reference members. 1662 switch (DS.getStorageClassSpec()) { 1663 case DeclSpec::SCS_unspecified: 1664 case DeclSpec::SCS_typedef: 1665 case DeclSpec::SCS_static: 1666 // FALL THROUGH. 1667 break; 1668 case DeclSpec::SCS_mutable: 1669 if (isFunc) { 1670 if (DS.getStorageClassSpecLoc().isValid()) 1671 Diag(DS.getStorageClassSpecLoc(), diag::err_mutable_function); 1672 else 1673 Diag(DS.getThreadSpecLoc(), diag::err_mutable_function); 1674 1675 // FIXME: It would be nicer if the keyword was ignored only for this 1676 // declarator. Otherwise we could get follow-up errors. 1677 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1678 } 1679 break; 1680 default: 1681 if (DS.getStorageClassSpecLoc().isValid()) 1682 Diag(DS.getStorageClassSpecLoc(), 1683 diag::err_storageclass_invalid_for_member); 1684 else 1685 Diag(DS.getThreadSpecLoc(), diag::err_storageclass_invalid_for_member); 1686 D.getMutableDeclSpec().ClearStorageClassSpecs(); 1687 } 1688 1689 bool isInstField = ((DS.getStorageClassSpec() == DeclSpec::SCS_unspecified || 1690 DS.getStorageClassSpec() == DeclSpec::SCS_mutable) && 1691 !isFunc); 1692 1693 if (DS.isConstexprSpecified() && isInstField) { 1694 SemaDiagnosticBuilder B = 1695 Diag(DS.getConstexprSpecLoc(), diag::err_invalid_constexpr_member); 1696 SourceLocation ConstexprLoc = DS.getConstexprSpecLoc(); 1697 if (InitStyle == ICIS_NoInit) { 1698 B << 0 << 0 << FixItHint::CreateReplacement(ConstexprLoc, "const"); 1699 D.getMutableDeclSpec().ClearConstexprSpec(); 1700 const char *PrevSpec; 1701 unsigned DiagID; 1702 bool Failed = D.getMutableDeclSpec().SetTypeQual(DeclSpec::TQ_const, ConstexprLoc, 1703 PrevSpec, DiagID, getLangOpts()); 1704 (void)Failed; 1705 assert(!Failed && "Making a constexpr member const shouldn't fail"); 1706 } else { 1707 B << 1; 1708 const char *PrevSpec; 1709 unsigned DiagID; 1710 if (D.getMutableDeclSpec().SetStorageClassSpec( 1711 *this, DeclSpec::SCS_static, ConstexprLoc, PrevSpec, DiagID)) { 1712 assert(DS.getStorageClassSpec() == DeclSpec::SCS_mutable && 1713 "This is the only DeclSpec that should fail to be applied"); 1714 B << 1; 1715 } else { 1716 B << 0 << FixItHint::CreateInsertion(ConstexprLoc, "static "); 1717 isInstField = false; 1718 } 1719 } 1720 } 1721 1722 NamedDecl *Member; 1723 if (isInstField) { 1724 CXXScopeSpec &SS = D.getCXXScopeSpec(); 1725 1726 // Data members must have identifiers for names. 1727 if (!Name.isIdentifier()) { 1728 Diag(Loc, diag::err_bad_variable_name) 1729 << Name; 1730 return 0; 1731 } 1732 1733 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1734 1735 // Member field could not be with "template" keyword. 1736 // So TemplateParameterLists should be empty in this case. 1737 if (TemplateParameterLists.size()) { 1738 TemplateParameterList* TemplateParams = TemplateParameterLists[0]; 1739 if (TemplateParams->size()) { 1740 // There is no such thing as a member field template. 1741 Diag(D.getIdentifierLoc(), diag::err_template_member) 1742 << II 1743 << SourceRange(TemplateParams->getTemplateLoc(), 1744 TemplateParams->getRAngleLoc()); 1745 } else { 1746 // There is an extraneous 'template<>' for this member. 1747 Diag(TemplateParams->getTemplateLoc(), 1748 diag::err_template_member_noparams) 1749 << II 1750 << SourceRange(TemplateParams->getTemplateLoc(), 1751 TemplateParams->getRAngleLoc()); 1752 } 1753 return 0; 1754 } 1755 1756 if (SS.isSet() && !SS.isInvalid()) { 1757 // The user provided a superfluous scope specifier inside a class 1758 // definition: 1759 // 1760 // class X { 1761 // int X::member; 1762 // }; 1763 if (DeclContext *DC = computeDeclContext(SS, false)) 1764 diagnoseQualifiedDeclaration(SS, DC, Name, D.getIdentifierLoc()); 1765 else 1766 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 1767 << Name << SS.getRange(); 1768 1769 SS.clear(); 1770 } 1771 1772 Member = HandleField(S, cast<CXXRecordDecl>(CurContext), Loc, D, BitWidth, 1773 InitStyle, AS); 1774 assert(Member && "HandleField never returns null"); 1775 } else { 1776 assert(InitStyle == ICIS_NoInit || D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static); 1777 1778 Member = HandleDeclarator(S, D, TemplateParameterLists); 1779 if (!Member) { 1780 return 0; 1781 } 1782 1783 // Non-instance-fields can't have a bitfield. 1784 if (BitWidth) { 1785 if (Member->isInvalidDecl()) { 1786 // don't emit another diagnostic. 1787 } else if (isa<VarDecl>(Member)) { 1788 // C++ 9.6p3: A bit-field shall not be a static member. 1789 // "static member 'A' cannot be a bit-field" 1790 Diag(Loc, diag::err_static_not_bitfield) 1791 << Name << BitWidth->getSourceRange(); 1792 } else if (isa<TypedefDecl>(Member)) { 1793 // "typedef member 'x' cannot be a bit-field" 1794 Diag(Loc, diag::err_typedef_not_bitfield) 1795 << Name << BitWidth->getSourceRange(); 1796 } else { 1797 // A function typedef ("typedef int f(); f a;"). 1798 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 1799 Diag(Loc, diag::err_not_integral_type_bitfield) 1800 << Name << cast<ValueDecl>(Member)->getType() 1801 << BitWidth->getSourceRange(); 1802 } 1803 1804 BitWidth = 0; 1805 Member->setInvalidDecl(); 1806 } 1807 1808 Member->setAccess(AS); 1809 1810 // If we have declared a member function template, set the access of the 1811 // templated declaration as well. 1812 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Member)) 1813 FunTmpl->getTemplatedDecl()->setAccess(AS); 1814 } 1815 1816 if (VS.isOverrideSpecified()) 1817 Member->addAttr(new (Context) OverrideAttr(VS.getOverrideLoc(), Context)); 1818 if (VS.isFinalSpecified()) 1819 Member->addAttr(new (Context) FinalAttr(VS.getFinalLoc(), Context)); 1820 1821 if (VS.getLastLocation().isValid()) { 1822 // Update the end location of a method that has a virt-specifiers. 1823 if (CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Member)) 1824 MD->setRangeEnd(VS.getLastLocation()); 1825 } 1826 1827 CheckOverrideControl(Member); 1828 1829 assert((Name || isInstField) && "No identifier for non-field ?"); 1830 1831 if (isInstField) { 1832 FieldDecl *FD = cast<FieldDecl>(Member); 1833 FieldCollector->Add(FD); 1834 1835 if (Diags.getDiagnosticLevel(diag::warn_unused_private_field, 1836 FD->getLocation()) 1837 != DiagnosticsEngine::Ignored) { 1838 // Remember all explicit private FieldDecls that have a name, no side 1839 // effects and are not part of a dependent type declaration. 1840 if (!FD->isImplicit() && FD->getDeclName() && 1841 FD->getAccess() == AS_private && 1842 !FD->hasAttr<UnusedAttr>() && 1843 !FD->getParent()->isDependentContext() && 1844 !InitializationHasSideEffects(*FD)) 1845 UnusedPrivateFields.insert(FD); 1846 } 1847 } 1848 1849 return Member; 1850} 1851 1852namespace { 1853 class UninitializedFieldVisitor 1854 : public EvaluatedExprVisitor<UninitializedFieldVisitor> { 1855 Sema &S; 1856 ValueDecl *VD; 1857 public: 1858 typedef EvaluatedExprVisitor<UninitializedFieldVisitor> Inherited; 1859 UninitializedFieldVisitor(Sema &S, ValueDecl *VD) : Inherited(S.Context), 1860 S(S) { 1861 if (IndirectFieldDecl *IFD = dyn_cast<IndirectFieldDecl>(VD)) 1862 this->VD = IFD->getAnonField(); 1863 else 1864 this->VD = VD; 1865 } 1866 1867 void HandleExpr(Expr *E) { 1868 if (!E) return; 1869 1870 // Expressions like x(x) sometimes lack the surrounding expressions 1871 // but need to be checked anyways. 1872 HandleValue(E); 1873 Visit(E); 1874 } 1875 1876 void HandleValue(Expr *E) { 1877 E = E->IgnoreParens(); 1878 1879 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 1880 if (isa<EnumConstantDecl>(ME->getMemberDecl())) 1881 return; 1882 1883 // FieldME is the inner-most MemberExpr that is not an anonymous struct 1884 // or union. 1885 MemberExpr *FieldME = ME; 1886 1887 Expr *Base = E; 1888 while (isa<MemberExpr>(Base)) { 1889 ME = cast<MemberExpr>(Base); 1890 1891 if (isa<VarDecl>(ME->getMemberDecl())) 1892 return; 1893 1894 if (FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 1895 if (!FD->isAnonymousStructOrUnion()) 1896 FieldME = ME; 1897 1898 Base = ME->getBase(); 1899 } 1900 1901 if (VD == FieldME->getMemberDecl() && isa<CXXThisExpr>(Base)) { 1902 unsigned diag = VD->getType()->isReferenceType() 1903 ? diag::warn_reference_field_is_uninit 1904 : diag::warn_field_is_uninit; 1905 S.Diag(FieldME->getExprLoc(), diag) << VD; 1906 } 1907 return; 1908 } 1909 1910 if (ConditionalOperator *CO = dyn_cast<ConditionalOperator>(E)) { 1911 HandleValue(CO->getTrueExpr()); 1912 HandleValue(CO->getFalseExpr()); 1913 return; 1914 } 1915 1916 if (BinaryConditionalOperator *BCO = 1917 dyn_cast<BinaryConditionalOperator>(E)) { 1918 HandleValue(BCO->getCommon()); 1919 HandleValue(BCO->getFalseExpr()); 1920 return; 1921 } 1922 1923 if (BinaryOperator *BO = dyn_cast<BinaryOperator>(E)) { 1924 switch (BO->getOpcode()) { 1925 default: 1926 return; 1927 case(BO_PtrMemD): 1928 case(BO_PtrMemI): 1929 HandleValue(BO->getLHS()); 1930 return; 1931 case(BO_Comma): 1932 HandleValue(BO->getRHS()); 1933 return; 1934 } 1935 } 1936 } 1937 1938 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 1939 if (E->getCastKind() == CK_LValueToRValue) 1940 HandleValue(E->getSubExpr()); 1941 1942 Inherited::VisitImplicitCastExpr(E); 1943 } 1944 1945 void VisitCXXMemberCallExpr(CXXMemberCallExpr *E) { 1946 Expr *Callee = E->getCallee(); 1947 if (isa<MemberExpr>(Callee)) 1948 HandleValue(Callee); 1949 1950 Inherited::VisitCXXMemberCallExpr(E); 1951 } 1952 }; 1953 static void CheckInitExprContainsUninitializedFields(Sema &S, Expr *E, 1954 ValueDecl *VD) { 1955 UninitializedFieldVisitor(S, VD).HandleExpr(E); 1956 } 1957} // namespace 1958 1959/// ActOnCXXInClassMemberInitializer - This is invoked after parsing an 1960/// in-class initializer for a non-static C++ class member, and after 1961/// instantiating an in-class initializer in a class template. Such actions 1962/// are deferred until the class is complete. 1963void 1964Sema::ActOnCXXInClassMemberInitializer(Decl *D, SourceLocation InitLoc, 1965 Expr *InitExpr) { 1966 FieldDecl *FD = cast<FieldDecl>(D); 1967 assert(FD->getInClassInitStyle() != ICIS_NoInit && 1968 "must set init style when field is created"); 1969 1970 if (!InitExpr) { 1971 FD->setInvalidDecl(); 1972 FD->removeInClassInitializer(); 1973 return; 1974 } 1975 1976 if (DiagnoseUnexpandedParameterPack(InitExpr, UPPC_Initializer)) { 1977 FD->setInvalidDecl(); 1978 FD->removeInClassInitializer(); 1979 return; 1980 } 1981 1982 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, InitLoc) 1983 != DiagnosticsEngine::Ignored) { 1984 CheckInitExprContainsUninitializedFields(*this, InitExpr, FD); 1985 } 1986 1987 ExprResult Init = InitExpr; 1988 if (!FD->getType()->isDependentType() && !InitExpr->isTypeDependent()) { 1989 if (isa<InitListExpr>(InitExpr) && isStdInitializerList(FD->getType(), 0)) { 1990 Diag(FD->getLocation(), diag::warn_dangling_std_initializer_list) 1991 << /*at end of ctor*/1 << InitExpr->getSourceRange(); 1992 } 1993 Expr **Inits = &InitExpr; 1994 unsigned NumInits = 1; 1995 InitializedEntity Entity = InitializedEntity::InitializeMember(FD); 1996 InitializationKind Kind = FD->getInClassInitStyle() == ICIS_ListInit 1997 ? InitializationKind::CreateDirectList(InitExpr->getLocStart()) 1998 : InitializationKind::CreateCopy(InitExpr->getLocStart(), InitLoc); 1999 InitializationSequence Seq(*this, Entity, Kind, Inits, NumInits); 2000 Init = Seq.Perform(*this, Entity, Kind, MultiExprArg(Inits, NumInits)); 2001 if (Init.isInvalid()) { 2002 FD->setInvalidDecl(); 2003 return; 2004 } 2005 } 2006 2007 // C++11 [class.base.init]p7: 2008 // The initialization of each base and member constitutes a 2009 // full-expression. 2010 Init = ActOnFinishFullExpr(Init.take(), InitLoc); 2011 if (Init.isInvalid()) { 2012 FD->setInvalidDecl(); 2013 return; 2014 } 2015 2016 InitExpr = Init.release(); 2017 2018 FD->setInClassInitializer(InitExpr); 2019} 2020 2021/// \brief Find the direct and/or virtual base specifiers that 2022/// correspond to the given base type, for use in base initialization 2023/// within a constructor. 2024static bool FindBaseInitializer(Sema &SemaRef, 2025 CXXRecordDecl *ClassDecl, 2026 QualType BaseType, 2027 const CXXBaseSpecifier *&DirectBaseSpec, 2028 const CXXBaseSpecifier *&VirtualBaseSpec) { 2029 // First, check for a direct base class. 2030 DirectBaseSpec = 0; 2031 for (CXXRecordDecl::base_class_const_iterator Base 2032 = ClassDecl->bases_begin(); 2033 Base != ClassDecl->bases_end(); ++Base) { 2034 if (SemaRef.Context.hasSameUnqualifiedType(BaseType, Base->getType())) { 2035 // We found a direct base of this type. That's what we're 2036 // initializing. 2037 DirectBaseSpec = &*Base; 2038 break; 2039 } 2040 } 2041 2042 // Check for a virtual base class. 2043 // FIXME: We might be able to short-circuit this if we know in advance that 2044 // there are no virtual bases. 2045 VirtualBaseSpec = 0; 2046 if (!DirectBaseSpec || !DirectBaseSpec->isVirtual()) { 2047 // We haven't found a base yet; search the class hierarchy for a 2048 // virtual base class. 2049 CXXBasePaths Paths(/*FindAmbiguities=*/true, /*RecordPaths=*/true, 2050 /*DetectVirtual=*/false); 2051 if (SemaRef.IsDerivedFrom(SemaRef.Context.getTypeDeclType(ClassDecl), 2052 BaseType, Paths)) { 2053 for (CXXBasePaths::paths_iterator Path = Paths.begin(); 2054 Path != Paths.end(); ++Path) { 2055 if (Path->back().Base->isVirtual()) { 2056 VirtualBaseSpec = Path->back().Base; 2057 break; 2058 } 2059 } 2060 } 2061 } 2062 2063 return DirectBaseSpec || VirtualBaseSpec; 2064} 2065 2066/// \brief Handle a C++ member initializer using braced-init-list syntax. 2067MemInitResult 2068Sema::ActOnMemInitializer(Decl *ConstructorD, 2069 Scope *S, 2070 CXXScopeSpec &SS, 2071 IdentifierInfo *MemberOrBase, 2072 ParsedType TemplateTypeTy, 2073 const DeclSpec &DS, 2074 SourceLocation IdLoc, 2075 Expr *InitList, 2076 SourceLocation EllipsisLoc) { 2077 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2078 DS, IdLoc, InitList, 2079 EllipsisLoc); 2080} 2081 2082/// \brief Handle a C++ member initializer using parentheses syntax. 2083MemInitResult 2084Sema::ActOnMemInitializer(Decl *ConstructorD, 2085 Scope *S, 2086 CXXScopeSpec &SS, 2087 IdentifierInfo *MemberOrBase, 2088 ParsedType TemplateTypeTy, 2089 const DeclSpec &DS, 2090 SourceLocation IdLoc, 2091 SourceLocation LParenLoc, 2092 Expr **Args, unsigned NumArgs, 2093 SourceLocation RParenLoc, 2094 SourceLocation EllipsisLoc) { 2095 Expr *List = new (Context) ParenListExpr(Context, LParenLoc, 2096 llvm::makeArrayRef(Args, NumArgs), 2097 RParenLoc); 2098 return BuildMemInitializer(ConstructorD, S, SS, MemberOrBase, TemplateTypeTy, 2099 DS, IdLoc, List, EllipsisLoc); 2100} 2101 2102namespace { 2103 2104// Callback to only accept typo corrections that can be a valid C++ member 2105// intializer: either a non-static field member or a base class. 2106class MemInitializerValidatorCCC : public CorrectionCandidateCallback { 2107 public: 2108 explicit MemInitializerValidatorCCC(CXXRecordDecl *ClassDecl) 2109 : ClassDecl(ClassDecl) {} 2110 2111 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 2112 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 2113 if (FieldDecl *Member = dyn_cast<FieldDecl>(ND)) 2114 return Member->getDeclContext()->getRedeclContext()->Equals(ClassDecl); 2115 else 2116 return isa<TypeDecl>(ND); 2117 } 2118 return false; 2119 } 2120 2121 private: 2122 CXXRecordDecl *ClassDecl; 2123}; 2124 2125} 2126 2127/// \brief Handle a C++ member initializer. 2128MemInitResult 2129Sema::BuildMemInitializer(Decl *ConstructorD, 2130 Scope *S, 2131 CXXScopeSpec &SS, 2132 IdentifierInfo *MemberOrBase, 2133 ParsedType TemplateTypeTy, 2134 const DeclSpec &DS, 2135 SourceLocation IdLoc, 2136 Expr *Init, 2137 SourceLocation EllipsisLoc) { 2138 if (!ConstructorD) 2139 return true; 2140 2141 AdjustDeclIfTemplate(ConstructorD); 2142 2143 CXXConstructorDecl *Constructor 2144 = dyn_cast<CXXConstructorDecl>(ConstructorD); 2145 if (!Constructor) { 2146 // The user wrote a constructor initializer on a function that is 2147 // not a C++ constructor. Ignore the error for now, because we may 2148 // have more member initializers coming; we'll diagnose it just 2149 // once in ActOnMemInitializers. 2150 return true; 2151 } 2152 2153 CXXRecordDecl *ClassDecl = Constructor->getParent(); 2154 2155 // C++ [class.base.init]p2: 2156 // Names in a mem-initializer-id are looked up in the scope of the 2157 // constructor's class and, if not found in that scope, are looked 2158 // up in the scope containing the constructor's definition. 2159 // [Note: if the constructor's class contains a member with the 2160 // same name as a direct or virtual base class of the class, a 2161 // mem-initializer-id naming the member or base class and composed 2162 // of a single identifier refers to the class member. A 2163 // mem-initializer-id for the hidden base class may be specified 2164 // using a qualified name. ] 2165 if (!SS.getScopeRep() && !TemplateTypeTy) { 2166 // Look for a member, first. 2167 DeclContext::lookup_result Result 2168 = ClassDecl->lookup(MemberOrBase); 2169 if (!Result.empty()) { 2170 ValueDecl *Member; 2171 if ((Member = dyn_cast<FieldDecl>(Result.front())) || 2172 (Member = dyn_cast<IndirectFieldDecl>(Result.front()))) { 2173 if (EllipsisLoc.isValid()) 2174 Diag(EllipsisLoc, diag::err_pack_expansion_member_init) 2175 << MemberOrBase 2176 << SourceRange(IdLoc, Init->getSourceRange().getEnd()); 2177 2178 return BuildMemberInitializer(Member, Init, IdLoc); 2179 } 2180 } 2181 } 2182 // It didn't name a member, so see if it names a class. 2183 QualType BaseType; 2184 TypeSourceInfo *TInfo = 0; 2185 2186 if (TemplateTypeTy) { 2187 BaseType = GetTypeFromParser(TemplateTypeTy, &TInfo); 2188 } else if (DS.getTypeSpecType() == TST_decltype) { 2189 BaseType = BuildDecltypeType(DS.getRepAsExpr(), DS.getTypeSpecTypeLoc()); 2190 } else { 2191 LookupResult R(*this, MemberOrBase, IdLoc, LookupOrdinaryName); 2192 LookupParsedName(R, S, &SS); 2193 2194 TypeDecl *TyD = R.getAsSingle<TypeDecl>(); 2195 if (!TyD) { 2196 if (R.isAmbiguous()) return true; 2197 2198 // We don't want access-control diagnostics here. 2199 R.suppressDiagnostics(); 2200 2201 if (SS.isSet() && isDependentScopeSpecifier(SS)) { 2202 bool NotUnknownSpecialization = false; 2203 DeclContext *DC = computeDeclContext(SS, false); 2204 if (CXXRecordDecl *Record = dyn_cast_or_null<CXXRecordDecl>(DC)) 2205 NotUnknownSpecialization = !Record->hasAnyDependentBases(); 2206 2207 if (!NotUnknownSpecialization) { 2208 // When the scope specifier can refer to a member of an unknown 2209 // specialization, we take it as a type name. 2210 BaseType = CheckTypenameType(ETK_None, SourceLocation(), 2211 SS.getWithLocInContext(Context), 2212 *MemberOrBase, IdLoc); 2213 if (BaseType.isNull()) 2214 return true; 2215 2216 R.clear(); 2217 R.setLookupName(MemberOrBase); 2218 } 2219 } 2220 2221 // If no results were found, try to correct typos. 2222 TypoCorrection Corr; 2223 MemInitializerValidatorCCC Validator(ClassDecl); 2224 if (R.empty() && BaseType.isNull() && 2225 (Corr = CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, &SS, 2226 Validator, ClassDecl))) { 2227 std::string CorrectedStr(Corr.getAsString(getLangOpts())); 2228 std::string CorrectedQuotedStr(Corr.getQuoted(getLangOpts())); 2229 if (FieldDecl *Member = Corr.getCorrectionDeclAs<FieldDecl>()) { 2230 // We have found a non-static data member with a similar 2231 // name to what was typed; complain and initialize that 2232 // member. 2233 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2234 << MemberOrBase << true << CorrectedQuotedStr 2235 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2236 Diag(Member->getLocation(), diag::note_previous_decl) 2237 << CorrectedQuotedStr; 2238 2239 return BuildMemberInitializer(Member, Init, IdLoc); 2240 } else if (TypeDecl *Type = Corr.getCorrectionDeclAs<TypeDecl>()) { 2241 const CXXBaseSpecifier *DirectBaseSpec; 2242 const CXXBaseSpecifier *VirtualBaseSpec; 2243 if (FindBaseInitializer(*this, ClassDecl, 2244 Context.getTypeDeclType(Type), 2245 DirectBaseSpec, VirtualBaseSpec)) { 2246 // We have found a direct or virtual base class with a 2247 // similar name to what was typed; complain and initialize 2248 // that base class. 2249 Diag(R.getNameLoc(), diag::err_mem_init_not_member_or_class_suggest) 2250 << MemberOrBase << false << CorrectedQuotedStr 2251 << FixItHint::CreateReplacement(R.getNameLoc(), CorrectedStr); 2252 2253 const CXXBaseSpecifier *BaseSpec = DirectBaseSpec? DirectBaseSpec 2254 : VirtualBaseSpec; 2255 Diag(BaseSpec->getLocStart(), 2256 diag::note_base_class_specified_here) 2257 << BaseSpec->getType() 2258 << BaseSpec->getSourceRange(); 2259 2260 TyD = Type; 2261 } 2262 } 2263 } 2264 2265 if (!TyD && BaseType.isNull()) { 2266 Diag(IdLoc, diag::err_mem_init_not_member_or_class) 2267 << MemberOrBase << SourceRange(IdLoc,Init->getSourceRange().getEnd()); 2268 return true; 2269 } 2270 } 2271 2272 if (BaseType.isNull()) { 2273 BaseType = Context.getTypeDeclType(TyD); 2274 if (SS.isSet()) { 2275 NestedNameSpecifier *Qualifier = 2276 static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2277 2278 // FIXME: preserve source range information 2279 BaseType = Context.getElaboratedType(ETK_None, Qualifier, BaseType); 2280 } 2281 } 2282 } 2283 2284 if (!TInfo) 2285 TInfo = Context.getTrivialTypeSourceInfo(BaseType, IdLoc); 2286 2287 return BuildBaseInitializer(BaseType, TInfo, Init, ClassDecl, EllipsisLoc); 2288} 2289 2290/// Checks a member initializer expression for cases where reference (or 2291/// pointer) members are bound to by-value parameters (or their addresses). 2292static void CheckForDanglingReferenceOrPointer(Sema &S, ValueDecl *Member, 2293 Expr *Init, 2294 SourceLocation IdLoc) { 2295 QualType MemberTy = Member->getType(); 2296 2297 // We only handle pointers and references currently. 2298 // FIXME: Would this be relevant for ObjC object pointers? Or block pointers? 2299 if (!MemberTy->isReferenceType() && !MemberTy->isPointerType()) 2300 return; 2301 2302 const bool IsPointer = MemberTy->isPointerType(); 2303 if (IsPointer) { 2304 if (const UnaryOperator *Op 2305 = dyn_cast<UnaryOperator>(Init->IgnoreParenImpCasts())) { 2306 // The only case we're worried about with pointers requires taking the 2307 // address. 2308 if (Op->getOpcode() != UO_AddrOf) 2309 return; 2310 2311 Init = Op->getSubExpr(); 2312 } else { 2313 // We only handle address-of expression initializers for pointers. 2314 return; 2315 } 2316 } 2317 2318 if (isa<MaterializeTemporaryExpr>(Init->IgnoreParens())) { 2319 // Taking the address of a temporary will be diagnosed as a hard error. 2320 if (IsPointer) 2321 return; 2322 2323 S.Diag(Init->getExprLoc(), diag::warn_bind_ref_member_to_temporary) 2324 << Member << Init->getSourceRange(); 2325 } else if (const DeclRefExpr *DRE 2326 = dyn_cast<DeclRefExpr>(Init->IgnoreParens())) { 2327 // We only warn when referring to a non-reference parameter declaration. 2328 const ParmVarDecl *Parameter = dyn_cast<ParmVarDecl>(DRE->getDecl()); 2329 if (!Parameter || Parameter->getType()->isReferenceType()) 2330 return; 2331 2332 S.Diag(Init->getExprLoc(), 2333 IsPointer ? diag::warn_init_ptr_member_to_parameter_addr 2334 : diag::warn_bind_ref_member_to_parameter) 2335 << Member << Parameter << Init->getSourceRange(); 2336 } else { 2337 // Other initializers are fine. 2338 return; 2339 } 2340 2341 S.Diag(Member->getLocation(), diag::note_ref_or_ptr_member_declared_here) 2342 << (unsigned)IsPointer; 2343} 2344 2345MemInitResult 2346Sema::BuildMemberInitializer(ValueDecl *Member, Expr *Init, 2347 SourceLocation IdLoc) { 2348 FieldDecl *DirectMember = dyn_cast<FieldDecl>(Member); 2349 IndirectFieldDecl *IndirectMember = dyn_cast<IndirectFieldDecl>(Member); 2350 assert((DirectMember || IndirectMember) && 2351 "Member must be a FieldDecl or IndirectFieldDecl"); 2352 2353 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2354 return true; 2355 2356 if (Member->isInvalidDecl()) 2357 return true; 2358 2359 // Diagnose value-uses of fields to initialize themselves, e.g. 2360 // foo(foo) 2361 // where foo is not also a parameter to the constructor. 2362 // TODO: implement -Wuninitialized and fold this into that framework. 2363 Expr **Args; 2364 unsigned NumArgs; 2365 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2366 Args = ParenList->getExprs(); 2367 NumArgs = ParenList->getNumExprs(); 2368 } else if (InitListExpr *InitList = dyn_cast<InitListExpr>(Init)) { 2369 Args = InitList->getInits(); 2370 NumArgs = InitList->getNumInits(); 2371 } else { 2372 // Template instantiation doesn't reconstruct ParenListExprs for us. 2373 Args = &Init; 2374 NumArgs = 1; 2375 } 2376 2377 if (getDiagnostics().getDiagnosticLevel(diag::warn_field_is_uninit, IdLoc) 2378 != DiagnosticsEngine::Ignored) 2379 for (unsigned i = 0; i < NumArgs; ++i) 2380 // FIXME: Warn about the case when other fields are used before being 2381 // initialized. For example, let this field be the i'th field. When 2382 // initializing the i'th field, throw a warning if any of the >= i'th 2383 // fields are used, as they are not yet initialized. 2384 // Right now we are only handling the case where the i'th field uses 2385 // itself in its initializer. 2386 // Also need to take into account that some fields may be initialized by 2387 // in-class initializers, see C++11 [class.base.init]p9. 2388 CheckInitExprContainsUninitializedFields(*this, Args[i], Member); 2389 2390 SourceRange InitRange = Init->getSourceRange(); 2391 2392 if (Member->getType()->isDependentType() || Init->isTypeDependent()) { 2393 // Can't check initialization for a member of dependent type or when 2394 // any of the arguments are type-dependent expressions. 2395 DiscardCleanupsInEvaluationContext(); 2396 } else { 2397 bool InitList = false; 2398 if (isa<InitListExpr>(Init)) { 2399 InitList = true; 2400 Args = &Init; 2401 NumArgs = 1; 2402 2403 if (isStdInitializerList(Member->getType(), 0)) { 2404 Diag(IdLoc, diag::warn_dangling_std_initializer_list) 2405 << /*at end of ctor*/1 << InitRange; 2406 } 2407 } 2408 2409 // Initialize the member. 2410 InitializedEntity MemberEntity = 2411 DirectMember ? InitializedEntity::InitializeMember(DirectMember, 0) 2412 : InitializedEntity::InitializeMember(IndirectMember, 0); 2413 InitializationKind Kind = 2414 InitList ? InitializationKind::CreateDirectList(IdLoc) 2415 : InitializationKind::CreateDirect(IdLoc, InitRange.getBegin(), 2416 InitRange.getEnd()); 2417 2418 InitializationSequence InitSeq(*this, MemberEntity, Kind, Args, NumArgs); 2419 ExprResult MemberInit = InitSeq.Perform(*this, MemberEntity, Kind, 2420 MultiExprArg(Args, NumArgs), 2421 0); 2422 if (MemberInit.isInvalid()) 2423 return true; 2424 2425 // C++11 [class.base.init]p7: 2426 // The initialization of each base and member constitutes a 2427 // full-expression. 2428 MemberInit = ActOnFinishFullExpr(MemberInit.get(), InitRange.getBegin()); 2429 if (MemberInit.isInvalid()) 2430 return true; 2431 2432 Init = MemberInit.get(); 2433 CheckForDanglingReferenceOrPointer(*this, Member, Init, IdLoc); 2434 } 2435 2436 if (DirectMember) { 2437 return new (Context) CXXCtorInitializer(Context, DirectMember, IdLoc, 2438 InitRange.getBegin(), Init, 2439 InitRange.getEnd()); 2440 } else { 2441 return new (Context) CXXCtorInitializer(Context, IndirectMember, IdLoc, 2442 InitRange.getBegin(), Init, 2443 InitRange.getEnd()); 2444 } 2445} 2446 2447MemInitResult 2448Sema::BuildDelegatingInitializer(TypeSourceInfo *TInfo, Expr *Init, 2449 CXXRecordDecl *ClassDecl) { 2450 SourceLocation NameLoc = TInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2451 if (!LangOpts.CPlusPlus11) 2452 return Diag(NameLoc, diag::err_delegating_ctor) 2453 << TInfo->getTypeLoc().getLocalSourceRange(); 2454 Diag(NameLoc, diag::warn_cxx98_compat_delegating_ctor); 2455 2456 bool InitList = true; 2457 Expr **Args = &Init; 2458 unsigned NumArgs = 1; 2459 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2460 InitList = false; 2461 Args = ParenList->getExprs(); 2462 NumArgs = ParenList->getNumExprs(); 2463 } 2464 2465 SourceRange InitRange = Init->getSourceRange(); 2466 // Initialize the object. 2467 InitializedEntity DelegationEntity = InitializedEntity::InitializeDelegation( 2468 QualType(ClassDecl->getTypeForDecl(), 0)); 2469 InitializationKind Kind = 2470 InitList ? InitializationKind::CreateDirectList(NameLoc) 2471 : InitializationKind::CreateDirect(NameLoc, InitRange.getBegin(), 2472 InitRange.getEnd()); 2473 InitializationSequence InitSeq(*this, DelegationEntity, Kind, Args, NumArgs); 2474 ExprResult DelegationInit = InitSeq.Perform(*this, DelegationEntity, Kind, 2475 MultiExprArg(Args, NumArgs), 2476 0); 2477 if (DelegationInit.isInvalid()) 2478 return true; 2479 2480 assert(cast<CXXConstructExpr>(DelegationInit.get())->getConstructor() && 2481 "Delegating constructor with no target?"); 2482 2483 // C++11 [class.base.init]p7: 2484 // The initialization of each base and member constitutes a 2485 // full-expression. 2486 DelegationInit = ActOnFinishFullExpr(DelegationInit.get(), 2487 InitRange.getBegin()); 2488 if (DelegationInit.isInvalid()) 2489 return true; 2490 2491 // If we are in a dependent context, template instantiation will 2492 // perform this type-checking again. Just save the arguments that we 2493 // received in a ParenListExpr. 2494 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2495 // of the information that we have about the base 2496 // initializer. However, deconstructing the ASTs is a dicey process, 2497 // and this approach is far more likely to get the corner cases right. 2498 if (CurContext->isDependentContext()) 2499 DelegationInit = Owned(Init); 2500 2501 return new (Context) CXXCtorInitializer(Context, TInfo, InitRange.getBegin(), 2502 DelegationInit.takeAs<Expr>(), 2503 InitRange.getEnd()); 2504} 2505 2506MemInitResult 2507Sema::BuildBaseInitializer(QualType BaseType, TypeSourceInfo *BaseTInfo, 2508 Expr *Init, CXXRecordDecl *ClassDecl, 2509 SourceLocation EllipsisLoc) { 2510 SourceLocation BaseLoc 2511 = BaseTInfo->getTypeLoc().getLocalSourceRange().getBegin(); 2512 2513 if (!BaseType->isDependentType() && !BaseType->isRecordType()) 2514 return Diag(BaseLoc, diag::err_base_init_does_not_name_class) 2515 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2516 2517 // C++ [class.base.init]p2: 2518 // [...] Unless the mem-initializer-id names a nonstatic data 2519 // member of the constructor's class or a direct or virtual base 2520 // of that class, the mem-initializer is ill-formed. A 2521 // mem-initializer-list can initialize a base class using any 2522 // name that denotes that base class type. 2523 bool Dependent = BaseType->isDependentType() || Init->isTypeDependent(); 2524 2525 SourceRange InitRange = Init->getSourceRange(); 2526 if (EllipsisLoc.isValid()) { 2527 // This is a pack expansion. 2528 if (!BaseType->containsUnexpandedParameterPack()) { 2529 Diag(EllipsisLoc, diag::err_pack_expansion_without_parameter_packs) 2530 << SourceRange(BaseLoc, InitRange.getEnd()); 2531 2532 EllipsisLoc = SourceLocation(); 2533 } 2534 } else { 2535 // Check for any unexpanded parameter packs. 2536 if (DiagnoseUnexpandedParameterPack(BaseLoc, BaseTInfo, UPPC_Initializer)) 2537 return true; 2538 2539 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) 2540 return true; 2541 } 2542 2543 // Check for direct and virtual base classes. 2544 const CXXBaseSpecifier *DirectBaseSpec = 0; 2545 const CXXBaseSpecifier *VirtualBaseSpec = 0; 2546 if (!Dependent) { 2547 if (Context.hasSameUnqualifiedType(QualType(ClassDecl->getTypeForDecl(),0), 2548 BaseType)) 2549 return BuildDelegatingInitializer(BaseTInfo, Init, ClassDecl); 2550 2551 FindBaseInitializer(*this, ClassDecl, BaseType, DirectBaseSpec, 2552 VirtualBaseSpec); 2553 2554 // C++ [base.class.init]p2: 2555 // Unless the mem-initializer-id names a nonstatic data member of the 2556 // constructor's class or a direct or virtual base of that class, the 2557 // mem-initializer is ill-formed. 2558 if (!DirectBaseSpec && !VirtualBaseSpec) { 2559 // If the class has any dependent bases, then it's possible that 2560 // one of those types will resolve to the same type as 2561 // BaseType. Therefore, just treat this as a dependent base 2562 // class initialization. FIXME: Should we try to check the 2563 // initialization anyway? It seems odd. 2564 if (ClassDecl->hasAnyDependentBases()) 2565 Dependent = true; 2566 else 2567 return Diag(BaseLoc, diag::err_not_direct_base_or_virtual) 2568 << BaseType << Context.getTypeDeclType(ClassDecl) 2569 << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2570 } 2571 } 2572 2573 if (Dependent) { 2574 DiscardCleanupsInEvaluationContext(); 2575 2576 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2577 /*IsVirtual=*/false, 2578 InitRange.getBegin(), Init, 2579 InitRange.getEnd(), EllipsisLoc); 2580 } 2581 2582 // C++ [base.class.init]p2: 2583 // If a mem-initializer-id is ambiguous because it designates both 2584 // a direct non-virtual base class and an inherited virtual base 2585 // class, the mem-initializer is ill-formed. 2586 if (DirectBaseSpec && VirtualBaseSpec) 2587 return Diag(BaseLoc, diag::err_base_init_direct_and_virtual) 2588 << BaseType << BaseTInfo->getTypeLoc().getLocalSourceRange(); 2589 2590 CXXBaseSpecifier *BaseSpec = const_cast<CXXBaseSpecifier *>(DirectBaseSpec); 2591 if (!BaseSpec) 2592 BaseSpec = const_cast<CXXBaseSpecifier *>(VirtualBaseSpec); 2593 2594 // Initialize the base. 2595 bool InitList = true; 2596 Expr **Args = &Init; 2597 unsigned NumArgs = 1; 2598 if (ParenListExpr *ParenList = dyn_cast<ParenListExpr>(Init)) { 2599 InitList = false; 2600 Args = ParenList->getExprs(); 2601 NumArgs = ParenList->getNumExprs(); 2602 } 2603 2604 InitializedEntity BaseEntity = 2605 InitializedEntity::InitializeBase(Context, BaseSpec, VirtualBaseSpec); 2606 InitializationKind Kind = 2607 InitList ? InitializationKind::CreateDirectList(BaseLoc) 2608 : InitializationKind::CreateDirect(BaseLoc, InitRange.getBegin(), 2609 InitRange.getEnd()); 2610 InitializationSequence InitSeq(*this, BaseEntity, Kind, Args, NumArgs); 2611 ExprResult BaseInit = InitSeq.Perform(*this, BaseEntity, Kind, 2612 MultiExprArg(Args, NumArgs), 0); 2613 if (BaseInit.isInvalid()) 2614 return true; 2615 2616 // C++11 [class.base.init]p7: 2617 // The initialization of each base and member constitutes a 2618 // full-expression. 2619 BaseInit = ActOnFinishFullExpr(BaseInit.get(), InitRange.getBegin()); 2620 if (BaseInit.isInvalid()) 2621 return true; 2622 2623 // If we are in a dependent context, template instantiation will 2624 // perform this type-checking again. Just save the arguments that we 2625 // received in a ParenListExpr. 2626 // FIXME: This isn't quite ideal, since our ASTs don't capture all 2627 // of the information that we have about the base 2628 // initializer. However, deconstructing the ASTs is a dicey process, 2629 // and this approach is far more likely to get the corner cases right. 2630 if (CurContext->isDependentContext()) 2631 BaseInit = Owned(Init); 2632 2633 return new (Context) CXXCtorInitializer(Context, BaseTInfo, 2634 BaseSpec->isVirtual(), 2635 InitRange.getBegin(), 2636 BaseInit.takeAs<Expr>(), 2637 InitRange.getEnd(), EllipsisLoc); 2638} 2639 2640// Create a static_cast\<T&&>(expr). 2641static Expr *CastForMoving(Sema &SemaRef, Expr *E, QualType T = QualType()) { 2642 if (T.isNull()) T = E->getType(); 2643 QualType TargetType = SemaRef.BuildReferenceType( 2644 T, /*SpelledAsLValue*/false, SourceLocation(), DeclarationName()); 2645 SourceLocation ExprLoc = E->getLocStart(); 2646 TypeSourceInfo *TargetLoc = SemaRef.Context.getTrivialTypeSourceInfo( 2647 TargetType, ExprLoc); 2648 2649 return SemaRef.BuildCXXNamedCast(ExprLoc, tok::kw_static_cast, TargetLoc, E, 2650 SourceRange(ExprLoc, ExprLoc), 2651 E->getSourceRange()).take(); 2652} 2653 2654/// ImplicitInitializerKind - How an implicit base or member initializer should 2655/// initialize its base or member. 2656enum ImplicitInitializerKind { 2657 IIK_Default, 2658 IIK_Copy, 2659 IIK_Move, 2660 IIK_Inherit 2661}; 2662 2663static bool 2664BuildImplicitBaseInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2665 ImplicitInitializerKind ImplicitInitKind, 2666 CXXBaseSpecifier *BaseSpec, 2667 bool IsInheritedVirtualBase, 2668 CXXCtorInitializer *&CXXBaseInit) { 2669 InitializedEntity InitEntity 2670 = InitializedEntity::InitializeBase(SemaRef.Context, BaseSpec, 2671 IsInheritedVirtualBase); 2672 2673 ExprResult BaseInit; 2674 2675 switch (ImplicitInitKind) { 2676 case IIK_Inherit: { 2677 const CXXRecordDecl *Inherited = 2678 Constructor->getInheritedConstructor()->getParent(); 2679 const CXXRecordDecl *Base = BaseSpec->getType()->getAsCXXRecordDecl(); 2680 if (Base && Inherited->getCanonicalDecl() == Base->getCanonicalDecl()) { 2681 // C++11 [class.inhctor]p8: 2682 // Each expression in the expression-list is of the form 2683 // static_cast<T&&>(p), where p is the name of the corresponding 2684 // constructor parameter and T is the declared type of p. 2685 SmallVector<Expr*, 16> Args; 2686 for (unsigned I = 0, E = Constructor->getNumParams(); I != E; ++I) { 2687 ParmVarDecl *PD = Constructor->getParamDecl(I); 2688 ExprResult ArgExpr = 2689 SemaRef.BuildDeclRefExpr(PD, PD->getType().getNonReferenceType(), 2690 VK_LValue, SourceLocation()); 2691 if (ArgExpr.isInvalid()) 2692 return true; 2693 Args.push_back(CastForMoving(SemaRef, ArgExpr.take(), PD->getType())); 2694 } 2695 2696 InitializationKind InitKind = InitializationKind::CreateDirect( 2697 Constructor->getLocation(), SourceLocation(), SourceLocation()); 2698 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2699 Args.data(), Args.size()); 2700 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, Args); 2701 break; 2702 } 2703 } 2704 // Fall through. 2705 case IIK_Default: { 2706 InitializationKind InitKind 2707 = InitializationKind::CreateDefault(Constructor->getLocation()); 2708 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2709 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2710 break; 2711 } 2712 2713 case IIK_Move: 2714 case IIK_Copy: { 2715 bool Moving = ImplicitInitKind == IIK_Move; 2716 ParmVarDecl *Param = Constructor->getParamDecl(0); 2717 QualType ParamType = Param->getType().getNonReferenceType(); 2718 2719 Expr *CopyCtorArg = 2720 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2721 SourceLocation(), Param, false, 2722 Constructor->getLocation(), ParamType, 2723 VK_LValue, 0); 2724 2725 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(CopyCtorArg)); 2726 2727 // Cast to the base class to avoid ambiguities. 2728 QualType ArgTy = 2729 SemaRef.Context.getQualifiedType(BaseSpec->getType().getUnqualifiedType(), 2730 ParamType.getQualifiers()); 2731 2732 if (Moving) { 2733 CopyCtorArg = CastForMoving(SemaRef, CopyCtorArg); 2734 } 2735 2736 CXXCastPath BasePath; 2737 BasePath.push_back(BaseSpec); 2738 CopyCtorArg = SemaRef.ImpCastExprToType(CopyCtorArg, ArgTy, 2739 CK_UncheckedDerivedToBase, 2740 Moving ? VK_XValue : VK_LValue, 2741 &BasePath).take(); 2742 2743 InitializationKind InitKind 2744 = InitializationKind::CreateDirect(Constructor->getLocation(), 2745 SourceLocation(), SourceLocation()); 2746 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 2747 &CopyCtorArg, 1); 2748 BaseInit = InitSeq.Perform(SemaRef, InitEntity, InitKind, 2749 MultiExprArg(&CopyCtorArg, 1)); 2750 break; 2751 } 2752 } 2753 2754 BaseInit = SemaRef.MaybeCreateExprWithCleanups(BaseInit); 2755 if (BaseInit.isInvalid()) 2756 return true; 2757 2758 CXXBaseInit = 2759 new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2760 SemaRef.Context.getTrivialTypeSourceInfo(BaseSpec->getType(), 2761 SourceLocation()), 2762 BaseSpec->isVirtual(), 2763 SourceLocation(), 2764 BaseInit.takeAs<Expr>(), 2765 SourceLocation(), 2766 SourceLocation()); 2767 2768 return false; 2769} 2770 2771static bool RefersToRValueRef(Expr *MemRef) { 2772 ValueDecl *Referenced = cast<MemberExpr>(MemRef)->getMemberDecl(); 2773 return Referenced->getType()->isRValueReferenceType(); 2774} 2775 2776static bool 2777BuildImplicitMemberInitializer(Sema &SemaRef, CXXConstructorDecl *Constructor, 2778 ImplicitInitializerKind ImplicitInitKind, 2779 FieldDecl *Field, IndirectFieldDecl *Indirect, 2780 CXXCtorInitializer *&CXXMemberInit) { 2781 if (Field->isInvalidDecl()) 2782 return true; 2783 2784 SourceLocation Loc = Constructor->getLocation(); 2785 2786 if (ImplicitInitKind == IIK_Copy || ImplicitInitKind == IIK_Move) { 2787 bool Moving = ImplicitInitKind == IIK_Move; 2788 ParmVarDecl *Param = Constructor->getParamDecl(0); 2789 QualType ParamType = Param->getType().getNonReferenceType(); 2790 2791 // Suppress copying zero-width bitfields. 2792 if (Field->isBitField() && Field->getBitWidthValue(SemaRef.Context) == 0) 2793 return false; 2794 2795 Expr *MemberExprBase = 2796 DeclRefExpr::Create(SemaRef.Context, NestedNameSpecifierLoc(), 2797 SourceLocation(), Param, false, 2798 Loc, ParamType, VK_LValue, 0); 2799 2800 SemaRef.MarkDeclRefReferenced(cast<DeclRefExpr>(MemberExprBase)); 2801 2802 if (Moving) { 2803 MemberExprBase = CastForMoving(SemaRef, MemberExprBase); 2804 } 2805 2806 // Build a reference to this field within the parameter. 2807 CXXScopeSpec SS; 2808 LookupResult MemberLookup(SemaRef, Field->getDeclName(), Loc, 2809 Sema::LookupMemberName); 2810 MemberLookup.addDecl(Indirect ? cast<ValueDecl>(Indirect) 2811 : cast<ValueDecl>(Field), AS_public); 2812 MemberLookup.resolveKind(); 2813 ExprResult CtorArg 2814 = SemaRef.BuildMemberReferenceExpr(MemberExprBase, 2815 ParamType, Loc, 2816 /*IsArrow=*/false, 2817 SS, 2818 /*TemplateKWLoc=*/SourceLocation(), 2819 /*FirstQualifierInScope=*/0, 2820 MemberLookup, 2821 /*TemplateArgs=*/0); 2822 if (CtorArg.isInvalid()) 2823 return true; 2824 2825 // C++11 [class.copy]p15: 2826 // - if a member m has rvalue reference type T&&, it is direct-initialized 2827 // with static_cast<T&&>(x.m); 2828 if (RefersToRValueRef(CtorArg.get())) { 2829 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2830 } 2831 2832 // When the field we are copying is an array, create index variables for 2833 // each dimension of the array. We use these index variables to subscript 2834 // the source array, and other clients (e.g., CodeGen) will perform the 2835 // necessary iteration with these index variables. 2836 SmallVector<VarDecl *, 4> IndexVariables; 2837 QualType BaseType = Field->getType(); 2838 QualType SizeType = SemaRef.Context.getSizeType(); 2839 bool InitializingArray = false; 2840 while (const ConstantArrayType *Array 2841 = SemaRef.Context.getAsConstantArrayType(BaseType)) { 2842 InitializingArray = true; 2843 // Create the iteration variable for this array index. 2844 IdentifierInfo *IterationVarName = 0; 2845 { 2846 SmallString<8> Str; 2847 llvm::raw_svector_ostream OS(Str); 2848 OS << "__i" << IndexVariables.size(); 2849 IterationVarName = &SemaRef.Context.Idents.get(OS.str()); 2850 } 2851 VarDecl *IterationVar 2852 = VarDecl::Create(SemaRef.Context, SemaRef.CurContext, Loc, Loc, 2853 IterationVarName, SizeType, 2854 SemaRef.Context.getTrivialTypeSourceInfo(SizeType, Loc), 2855 SC_None, SC_None); 2856 IndexVariables.push_back(IterationVar); 2857 2858 // Create a reference to the iteration variable. 2859 ExprResult IterationVarRef 2860 = SemaRef.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc); 2861 assert(!IterationVarRef.isInvalid() && 2862 "Reference to invented variable cannot fail!"); 2863 IterationVarRef = SemaRef.DefaultLvalueConversion(IterationVarRef.take()); 2864 assert(!IterationVarRef.isInvalid() && 2865 "Conversion of invented variable cannot fail!"); 2866 2867 // Subscript the array with this iteration variable. 2868 CtorArg = SemaRef.CreateBuiltinArraySubscriptExpr(CtorArg.take(), Loc, 2869 IterationVarRef.take(), 2870 Loc); 2871 if (CtorArg.isInvalid()) 2872 return true; 2873 2874 BaseType = Array->getElementType(); 2875 } 2876 2877 // The array subscript expression is an lvalue, which is wrong for moving. 2878 if (Moving && InitializingArray) 2879 CtorArg = CastForMoving(SemaRef, CtorArg.take()); 2880 2881 // Construct the entity that we will be initializing. For an array, this 2882 // will be first element in the array, which may require several levels 2883 // of array-subscript entities. 2884 SmallVector<InitializedEntity, 4> Entities; 2885 Entities.reserve(1 + IndexVariables.size()); 2886 if (Indirect) 2887 Entities.push_back(InitializedEntity::InitializeMember(Indirect)); 2888 else 2889 Entities.push_back(InitializedEntity::InitializeMember(Field)); 2890 for (unsigned I = 0, N = IndexVariables.size(); I != N; ++I) 2891 Entities.push_back(InitializedEntity::InitializeElement(SemaRef.Context, 2892 0, 2893 Entities.back())); 2894 2895 // Direct-initialize to use the copy constructor. 2896 InitializationKind InitKind = 2897 InitializationKind::CreateDirect(Loc, SourceLocation(), SourceLocation()); 2898 2899 Expr *CtorArgE = CtorArg.takeAs<Expr>(); 2900 InitializationSequence InitSeq(SemaRef, Entities.back(), InitKind, 2901 &CtorArgE, 1); 2902 2903 ExprResult MemberInit 2904 = InitSeq.Perform(SemaRef, Entities.back(), InitKind, 2905 MultiExprArg(&CtorArgE, 1)); 2906 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2907 if (MemberInit.isInvalid()) 2908 return true; 2909 2910 if (Indirect) { 2911 assert(IndexVariables.size() == 0 && 2912 "Indirect field improperly initialized"); 2913 CXXMemberInit 2914 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 2915 Loc, Loc, 2916 MemberInit.takeAs<Expr>(), 2917 Loc); 2918 } else 2919 CXXMemberInit = CXXCtorInitializer::Create(SemaRef.Context, Field, Loc, 2920 Loc, MemberInit.takeAs<Expr>(), 2921 Loc, 2922 IndexVariables.data(), 2923 IndexVariables.size()); 2924 return false; 2925 } 2926 2927 assert((ImplicitInitKind == IIK_Default || ImplicitInitKind == IIK_Inherit) && 2928 "Unhandled implicit init kind!"); 2929 2930 QualType FieldBaseElementType = 2931 SemaRef.Context.getBaseElementType(Field->getType()); 2932 2933 if (FieldBaseElementType->isRecordType()) { 2934 InitializedEntity InitEntity 2935 = Indirect? InitializedEntity::InitializeMember(Indirect) 2936 : InitializedEntity::InitializeMember(Field); 2937 InitializationKind InitKind = 2938 InitializationKind::CreateDefault(Loc); 2939 2940 InitializationSequence InitSeq(SemaRef, InitEntity, InitKind, 0, 0); 2941 ExprResult MemberInit = 2942 InitSeq.Perform(SemaRef, InitEntity, InitKind, MultiExprArg()); 2943 2944 MemberInit = SemaRef.MaybeCreateExprWithCleanups(MemberInit); 2945 if (MemberInit.isInvalid()) 2946 return true; 2947 2948 if (Indirect) 2949 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2950 Indirect, Loc, 2951 Loc, 2952 MemberInit.get(), 2953 Loc); 2954 else 2955 CXXMemberInit = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, 2956 Field, Loc, Loc, 2957 MemberInit.get(), 2958 Loc); 2959 return false; 2960 } 2961 2962 if (!Field->getParent()->isUnion()) { 2963 if (FieldBaseElementType->isReferenceType()) { 2964 SemaRef.Diag(Constructor->getLocation(), 2965 diag::err_uninitialized_member_in_ctor) 2966 << (int)Constructor->isImplicit() 2967 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2968 << 0 << Field->getDeclName(); 2969 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2970 return true; 2971 } 2972 2973 if (FieldBaseElementType.isConstQualified()) { 2974 SemaRef.Diag(Constructor->getLocation(), 2975 diag::err_uninitialized_member_in_ctor) 2976 << (int)Constructor->isImplicit() 2977 << SemaRef.Context.getTagDeclType(Constructor->getParent()) 2978 << 1 << Field->getDeclName(); 2979 SemaRef.Diag(Field->getLocation(), diag::note_declared_at); 2980 return true; 2981 } 2982 } 2983 2984 if (SemaRef.getLangOpts().ObjCAutoRefCount && 2985 FieldBaseElementType->isObjCRetainableType() && 2986 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_None && 2987 FieldBaseElementType.getObjCLifetime() != Qualifiers::OCL_ExplicitNone) { 2988 // ARC: 2989 // Default-initialize Objective-C pointers to NULL. 2990 CXXMemberInit 2991 = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 2992 Loc, Loc, 2993 new (SemaRef.Context) ImplicitValueInitExpr(Field->getType()), 2994 Loc); 2995 return false; 2996 } 2997 2998 // Nothing to initialize. 2999 CXXMemberInit = 0; 3000 return false; 3001} 3002 3003namespace { 3004struct BaseAndFieldInfo { 3005 Sema &S; 3006 CXXConstructorDecl *Ctor; 3007 bool AnyErrorsInInits; 3008 ImplicitInitializerKind IIK; 3009 llvm::DenseMap<const void *, CXXCtorInitializer*> AllBaseFields; 3010 SmallVector<CXXCtorInitializer*, 8> AllToInit; 3011 3012 BaseAndFieldInfo(Sema &S, CXXConstructorDecl *Ctor, bool ErrorsInInits) 3013 : S(S), Ctor(Ctor), AnyErrorsInInits(ErrorsInInits) { 3014 bool Generated = Ctor->isImplicit() || Ctor->isDefaulted(); 3015 if (Generated && Ctor->isCopyConstructor()) 3016 IIK = IIK_Copy; 3017 else if (Generated && Ctor->isMoveConstructor()) 3018 IIK = IIK_Move; 3019 else if (Ctor->getInheritedConstructor()) 3020 IIK = IIK_Inherit; 3021 else 3022 IIK = IIK_Default; 3023 } 3024 3025 bool isImplicitCopyOrMove() const { 3026 switch (IIK) { 3027 case IIK_Copy: 3028 case IIK_Move: 3029 return true; 3030 3031 case IIK_Default: 3032 case IIK_Inherit: 3033 return false; 3034 } 3035 3036 llvm_unreachable("Invalid ImplicitInitializerKind!"); 3037 } 3038 3039 bool addFieldInitializer(CXXCtorInitializer *Init) { 3040 AllToInit.push_back(Init); 3041 3042 // Check whether this initializer makes the field "used". 3043 if (Init->getInit() && Init->getInit()->HasSideEffects(S.Context)) 3044 S.UnusedPrivateFields.remove(Init->getAnyMember()); 3045 3046 return false; 3047 } 3048}; 3049} 3050 3051/// \brief Determine whether the given indirect field declaration is somewhere 3052/// within an anonymous union. 3053static bool isWithinAnonymousUnion(IndirectFieldDecl *F) { 3054 for (IndirectFieldDecl::chain_iterator C = F->chain_begin(), 3055 CEnd = F->chain_end(); 3056 C != CEnd; ++C) 3057 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>((*C)->getDeclContext())) 3058 if (Record->isUnion()) 3059 return true; 3060 3061 return false; 3062} 3063 3064/// \brief Determine whether the given type is an incomplete or zero-lenfgth 3065/// array type. 3066static bool isIncompleteOrZeroLengthArrayType(ASTContext &Context, QualType T) { 3067 if (T->isIncompleteArrayType()) 3068 return true; 3069 3070 while (const ConstantArrayType *ArrayT = Context.getAsConstantArrayType(T)) { 3071 if (!ArrayT->getSize()) 3072 return true; 3073 3074 T = ArrayT->getElementType(); 3075 } 3076 3077 return false; 3078} 3079 3080static bool CollectFieldInitializer(Sema &SemaRef, BaseAndFieldInfo &Info, 3081 FieldDecl *Field, 3082 IndirectFieldDecl *Indirect = 0) { 3083 3084 // Overwhelmingly common case: we have a direct initializer for this field. 3085 if (CXXCtorInitializer *Init = Info.AllBaseFields.lookup(Field)) 3086 return Info.addFieldInitializer(Init); 3087 3088 // C++11 [class.base.init]p8: if the entity is a non-static data member that 3089 // has a brace-or-equal-initializer, the entity is initialized as specified 3090 // in [dcl.init]. 3091 if (Field->hasInClassInitializer() && !Info.isImplicitCopyOrMove()) { 3092 CXXCtorInitializer *Init; 3093 if (Indirect) 3094 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Indirect, 3095 SourceLocation(), 3096 SourceLocation(), 0, 3097 SourceLocation()); 3098 else 3099 Init = new (SemaRef.Context) CXXCtorInitializer(SemaRef.Context, Field, 3100 SourceLocation(), 3101 SourceLocation(), 0, 3102 SourceLocation()); 3103 return Info.addFieldInitializer(Init); 3104 } 3105 3106 // Don't build an implicit initializer for union members if none was 3107 // explicitly specified. 3108 if (Field->getParent()->isUnion() || 3109 (Indirect && isWithinAnonymousUnion(Indirect))) 3110 return false; 3111 3112 // Don't initialize incomplete or zero-length arrays. 3113 if (isIncompleteOrZeroLengthArrayType(SemaRef.Context, Field->getType())) 3114 return false; 3115 3116 // Don't try to build an implicit initializer if there were semantic 3117 // errors in any of the initializers (and therefore we might be 3118 // missing some that the user actually wrote). 3119 if (Info.AnyErrorsInInits || Field->isInvalidDecl()) 3120 return false; 3121 3122 CXXCtorInitializer *Init = 0; 3123 if (BuildImplicitMemberInitializer(Info.S, Info.Ctor, Info.IIK, Field, 3124 Indirect, Init)) 3125 return true; 3126 3127 if (!Init) 3128 return false; 3129 3130 return Info.addFieldInitializer(Init); 3131} 3132 3133bool 3134Sema::SetDelegatingInitializer(CXXConstructorDecl *Constructor, 3135 CXXCtorInitializer *Initializer) { 3136 assert(Initializer->isDelegatingInitializer()); 3137 Constructor->setNumCtorInitializers(1); 3138 CXXCtorInitializer **initializer = 3139 new (Context) CXXCtorInitializer*[1]; 3140 memcpy(initializer, &Initializer, sizeof (CXXCtorInitializer*)); 3141 Constructor->setCtorInitializers(initializer); 3142 3143 if (CXXDestructorDecl *Dtor = LookupDestructor(Constructor->getParent())) { 3144 MarkFunctionReferenced(Initializer->getSourceLocation(), Dtor); 3145 DiagnoseUseOfDecl(Dtor, Initializer->getSourceLocation()); 3146 } 3147 3148 DelegatingCtorDecls.push_back(Constructor); 3149 3150 return false; 3151} 3152 3153bool Sema::SetCtorInitializers(CXXConstructorDecl *Constructor, bool AnyErrors, 3154 ArrayRef<CXXCtorInitializer *> Initializers) { 3155 if (Constructor->isDependentContext()) { 3156 // Just store the initializers as written, they will be checked during 3157 // instantiation. 3158 if (!Initializers.empty()) { 3159 Constructor->setNumCtorInitializers(Initializers.size()); 3160 CXXCtorInitializer **baseOrMemberInitializers = 3161 new (Context) CXXCtorInitializer*[Initializers.size()]; 3162 memcpy(baseOrMemberInitializers, Initializers.data(), 3163 Initializers.size() * sizeof(CXXCtorInitializer*)); 3164 Constructor->setCtorInitializers(baseOrMemberInitializers); 3165 } 3166 3167 // Let template instantiation know whether we had errors. 3168 if (AnyErrors) 3169 Constructor->setInvalidDecl(); 3170 3171 return false; 3172 } 3173 3174 BaseAndFieldInfo Info(*this, Constructor, AnyErrors); 3175 3176 // We need to build the initializer AST according to order of construction 3177 // and not what user specified in the Initializers list. 3178 CXXRecordDecl *ClassDecl = Constructor->getParent()->getDefinition(); 3179 if (!ClassDecl) 3180 return true; 3181 3182 bool HadError = false; 3183 3184 for (unsigned i = 0; i < Initializers.size(); i++) { 3185 CXXCtorInitializer *Member = Initializers[i]; 3186 3187 if (Member->isBaseInitializer()) 3188 Info.AllBaseFields[Member->getBaseClass()->getAs<RecordType>()] = Member; 3189 else 3190 Info.AllBaseFields[Member->getAnyMember()] = Member; 3191 } 3192 3193 // Keep track of the direct virtual bases. 3194 llvm::SmallPtrSet<CXXBaseSpecifier *, 16> DirectVBases; 3195 for (CXXRecordDecl::base_class_iterator I = ClassDecl->bases_begin(), 3196 E = ClassDecl->bases_end(); I != E; ++I) { 3197 if (I->isVirtual()) 3198 DirectVBases.insert(I); 3199 } 3200 3201 // Push virtual bases before others. 3202 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3203 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3204 3205 if (CXXCtorInitializer *Value 3206 = Info.AllBaseFields.lookup(VBase->getType()->getAs<RecordType>())) { 3207 Info.AllToInit.push_back(Value); 3208 } else if (!AnyErrors) { 3209 bool IsInheritedVirtualBase = !DirectVBases.count(VBase); 3210 CXXCtorInitializer *CXXBaseInit; 3211 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3212 VBase, IsInheritedVirtualBase, 3213 CXXBaseInit)) { 3214 HadError = true; 3215 continue; 3216 } 3217 3218 Info.AllToInit.push_back(CXXBaseInit); 3219 } 3220 } 3221 3222 // Non-virtual bases. 3223 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3224 E = ClassDecl->bases_end(); Base != E; ++Base) { 3225 // Virtuals are in the virtual base list and already constructed. 3226 if (Base->isVirtual()) 3227 continue; 3228 3229 if (CXXCtorInitializer *Value 3230 = Info.AllBaseFields.lookup(Base->getType()->getAs<RecordType>())) { 3231 Info.AllToInit.push_back(Value); 3232 } else if (!AnyErrors) { 3233 CXXCtorInitializer *CXXBaseInit; 3234 if (BuildImplicitBaseInitializer(*this, Constructor, Info.IIK, 3235 Base, /*IsInheritedVirtualBase=*/false, 3236 CXXBaseInit)) { 3237 HadError = true; 3238 continue; 3239 } 3240 3241 Info.AllToInit.push_back(CXXBaseInit); 3242 } 3243 } 3244 3245 // Fields. 3246 for (DeclContext::decl_iterator Mem = ClassDecl->decls_begin(), 3247 MemEnd = ClassDecl->decls_end(); 3248 Mem != MemEnd; ++Mem) { 3249 if (FieldDecl *F = dyn_cast<FieldDecl>(*Mem)) { 3250 // C++ [class.bit]p2: 3251 // A declaration for a bit-field that omits the identifier declares an 3252 // unnamed bit-field. Unnamed bit-fields are not members and cannot be 3253 // initialized. 3254 if (F->isUnnamedBitfield()) 3255 continue; 3256 3257 // If we're not generating the implicit copy/move constructor, then we'll 3258 // handle anonymous struct/union fields based on their individual 3259 // indirect fields. 3260 if (F->isAnonymousStructOrUnion() && !Info.isImplicitCopyOrMove()) 3261 continue; 3262 3263 if (CollectFieldInitializer(*this, Info, F)) 3264 HadError = true; 3265 continue; 3266 } 3267 3268 // Beyond this point, we only consider default initialization. 3269 if (Info.isImplicitCopyOrMove()) 3270 continue; 3271 3272 if (IndirectFieldDecl *F = dyn_cast<IndirectFieldDecl>(*Mem)) { 3273 if (F->getType()->isIncompleteArrayType()) { 3274 assert(ClassDecl->hasFlexibleArrayMember() && 3275 "Incomplete array type is not valid"); 3276 continue; 3277 } 3278 3279 // Initialize each field of an anonymous struct individually. 3280 if (CollectFieldInitializer(*this, Info, F->getAnonField(), F)) 3281 HadError = true; 3282 3283 continue; 3284 } 3285 } 3286 3287 unsigned NumInitializers = Info.AllToInit.size(); 3288 if (NumInitializers > 0) { 3289 Constructor->setNumCtorInitializers(NumInitializers); 3290 CXXCtorInitializer **baseOrMemberInitializers = 3291 new (Context) CXXCtorInitializer*[NumInitializers]; 3292 memcpy(baseOrMemberInitializers, Info.AllToInit.data(), 3293 NumInitializers * sizeof(CXXCtorInitializer*)); 3294 Constructor->setCtorInitializers(baseOrMemberInitializers); 3295 3296 // Constructors implicitly reference the base and member 3297 // destructors. 3298 MarkBaseAndMemberDestructorsReferenced(Constructor->getLocation(), 3299 Constructor->getParent()); 3300 } 3301 3302 return HadError; 3303} 3304 3305static void PopulateKeysForFields(FieldDecl *Field, SmallVectorImpl<const void*> &IdealInits) { 3306 if (const RecordType *RT = Field->getType()->getAs<RecordType>()) { 3307 const RecordDecl *RD = RT->getDecl(); 3308 if (RD->isAnonymousStructOrUnion()) { 3309 for (RecordDecl::field_iterator Field = RD->field_begin(), 3310 E = RD->field_end(); Field != E; ++Field) 3311 PopulateKeysForFields(*Field, IdealInits); 3312 return; 3313 } 3314 } 3315 IdealInits.push_back(Field); 3316} 3317 3318static void *GetKeyForBase(ASTContext &Context, QualType BaseType) { 3319 return const_cast<Type*>(Context.getCanonicalType(BaseType).getTypePtr()); 3320} 3321 3322static void *GetKeyForMember(ASTContext &Context, 3323 CXXCtorInitializer *Member) { 3324 if (!Member->isAnyMemberInitializer()) 3325 return GetKeyForBase(Context, QualType(Member->getBaseClass(), 0)); 3326 3327 return Member->getAnyMember(); 3328} 3329 3330static void DiagnoseBaseOrMemInitializerOrder( 3331 Sema &SemaRef, const CXXConstructorDecl *Constructor, 3332 ArrayRef<CXXCtorInitializer *> Inits) { 3333 if (Constructor->getDeclContext()->isDependentContext()) 3334 return; 3335 3336 // Don't check initializers order unless the warning is enabled at the 3337 // location of at least one initializer. 3338 bool ShouldCheckOrder = false; 3339 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3340 CXXCtorInitializer *Init = Inits[InitIndex]; 3341 if (SemaRef.Diags.getDiagnosticLevel(diag::warn_initializer_out_of_order, 3342 Init->getSourceLocation()) 3343 != DiagnosticsEngine::Ignored) { 3344 ShouldCheckOrder = true; 3345 break; 3346 } 3347 } 3348 if (!ShouldCheckOrder) 3349 return; 3350 3351 // Build the list of bases and members in the order that they'll 3352 // actually be initialized. The explicit initializers should be in 3353 // this same order but may be missing things. 3354 SmallVector<const void*, 32> IdealInitKeys; 3355 3356 const CXXRecordDecl *ClassDecl = Constructor->getParent(); 3357 3358 // 1. Virtual bases. 3359 for (CXXRecordDecl::base_class_const_iterator VBase = 3360 ClassDecl->vbases_begin(), 3361 E = ClassDecl->vbases_end(); VBase != E; ++VBase) 3362 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, VBase->getType())); 3363 3364 // 2. Non-virtual bases. 3365 for (CXXRecordDecl::base_class_const_iterator Base = ClassDecl->bases_begin(), 3366 E = ClassDecl->bases_end(); Base != E; ++Base) { 3367 if (Base->isVirtual()) 3368 continue; 3369 IdealInitKeys.push_back(GetKeyForBase(SemaRef.Context, Base->getType())); 3370 } 3371 3372 // 3. Direct fields. 3373 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 3374 E = ClassDecl->field_end(); Field != E; ++Field) { 3375 if (Field->isUnnamedBitfield()) 3376 continue; 3377 3378 PopulateKeysForFields(*Field, IdealInitKeys); 3379 } 3380 3381 unsigned NumIdealInits = IdealInitKeys.size(); 3382 unsigned IdealIndex = 0; 3383 3384 CXXCtorInitializer *PrevInit = 0; 3385 for (unsigned InitIndex = 0; InitIndex != Inits.size(); ++InitIndex) { 3386 CXXCtorInitializer *Init = Inits[InitIndex]; 3387 void *InitKey = GetKeyForMember(SemaRef.Context, Init); 3388 3389 // Scan forward to try to find this initializer in the idealized 3390 // initializers list. 3391 for (; IdealIndex != NumIdealInits; ++IdealIndex) 3392 if (InitKey == IdealInitKeys[IdealIndex]) 3393 break; 3394 3395 // If we didn't find this initializer, it must be because we 3396 // scanned past it on a previous iteration. That can only 3397 // happen if we're out of order; emit a warning. 3398 if (IdealIndex == NumIdealInits && PrevInit) { 3399 Sema::SemaDiagnosticBuilder D = 3400 SemaRef.Diag(PrevInit->getSourceLocation(), 3401 diag::warn_initializer_out_of_order); 3402 3403 if (PrevInit->isAnyMemberInitializer()) 3404 D << 0 << PrevInit->getAnyMember()->getDeclName(); 3405 else 3406 D << 1 << PrevInit->getTypeSourceInfo()->getType(); 3407 3408 if (Init->isAnyMemberInitializer()) 3409 D << 0 << Init->getAnyMember()->getDeclName(); 3410 else 3411 D << 1 << Init->getTypeSourceInfo()->getType(); 3412 3413 // Move back to the initializer's location in the ideal list. 3414 for (IdealIndex = 0; IdealIndex != NumIdealInits; ++IdealIndex) 3415 if (InitKey == IdealInitKeys[IdealIndex]) 3416 break; 3417 3418 assert(IdealIndex != NumIdealInits && 3419 "initializer not found in initializer list"); 3420 } 3421 3422 PrevInit = Init; 3423 } 3424} 3425 3426namespace { 3427bool CheckRedundantInit(Sema &S, 3428 CXXCtorInitializer *Init, 3429 CXXCtorInitializer *&PrevInit) { 3430 if (!PrevInit) { 3431 PrevInit = Init; 3432 return false; 3433 } 3434 3435 if (FieldDecl *Field = Init->getAnyMember()) 3436 S.Diag(Init->getSourceLocation(), 3437 diag::err_multiple_mem_initialization) 3438 << Field->getDeclName() 3439 << Init->getSourceRange(); 3440 else { 3441 const Type *BaseClass = Init->getBaseClass(); 3442 assert(BaseClass && "neither field nor base"); 3443 S.Diag(Init->getSourceLocation(), 3444 diag::err_multiple_base_initialization) 3445 << QualType(BaseClass, 0) 3446 << Init->getSourceRange(); 3447 } 3448 S.Diag(PrevInit->getSourceLocation(), diag::note_previous_initializer) 3449 << 0 << PrevInit->getSourceRange(); 3450 3451 return true; 3452} 3453 3454typedef std::pair<NamedDecl *, CXXCtorInitializer *> UnionEntry; 3455typedef llvm::DenseMap<RecordDecl*, UnionEntry> RedundantUnionMap; 3456 3457bool CheckRedundantUnionInit(Sema &S, 3458 CXXCtorInitializer *Init, 3459 RedundantUnionMap &Unions) { 3460 FieldDecl *Field = Init->getAnyMember(); 3461 RecordDecl *Parent = Field->getParent(); 3462 NamedDecl *Child = Field; 3463 3464 while (Parent->isAnonymousStructOrUnion() || Parent->isUnion()) { 3465 if (Parent->isUnion()) { 3466 UnionEntry &En = Unions[Parent]; 3467 if (En.first && En.first != Child) { 3468 S.Diag(Init->getSourceLocation(), 3469 diag::err_multiple_mem_union_initialization) 3470 << Field->getDeclName() 3471 << Init->getSourceRange(); 3472 S.Diag(En.second->getSourceLocation(), diag::note_previous_initializer) 3473 << 0 << En.second->getSourceRange(); 3474 return true; 3475 } 3476 if (!En.first) { 3477 En.first = Child; 3478 En.second = Init; 3479 } 3480 if (!Parent->isAnonymousStructOrUnion()) 3481 return false; 3482 } 3483 3484 Child = Parent; 3485 Parent = cast<RecordDecl>(Parent->getDeclContext()); 3486 } 3487 3488 return false; 3489} 3490} 3491 3492/// ActOnMemInitializers - Handle the member initializers for a constructor. 3493void Sema::ActOnMemInitializers(Decl *ConstructorDecl, 3494 SourceLocation ColonLoc, 3495 ArrayRef<CXXCtorInitializer*> MemInits, 3496 bool AnyErrors) { 3497 if (!ConstructorDecl) 3498 return; 3499 3500 AdjustDeclIfTemplate(ConstructorDecl); 3501 3502 CXXConstructorDecl *Constructor 3503 = dyn_cast<CXXConstructorDecl>(ConstructorDecl); 3504 3505 if (!Constructor) { 3506 Diag(ColonLoc, diag::err_only_constructors_take_base_inits); 3507 return; 3508 } 3509 3510 // Mapping for the duplicate initializers check. 3511 // For member initializers, this is keyed with a FieldDecl*. 3512 // For base initializers, this is keyed with a Type*. 3513 llvm::DenseMap<void*, CXXCtorInitializer *> Members; 3514 3515 // Mapping for the inconsistent anonymous-union initializers check. 3516 RedundantUnionMap MemberUnions; 3517 3518 bool HadError = false; 3519 for (unsigned i = 0; i < MemInits.size(); i++) { 3520 CXXCtorInitializer *Init = MemInits[i]; 3521 3522 // Set the source order index. 3523 Init->setSourceOrder(i); 3524 3525 if (Init->isAnyMemberInitializer()) { 3526 FieldDecl *Field = Init->getAnyMember(); 3527 if (CheckRedundantInit(*this, Init, Members[Field]) || 3528 CheckRedundantUnionInit(*this, Init, MemberUnions)) 3529 HadError = true; 3530 } else if (Init->isBaseInitializer()) { 3531 void *Key = GetKeyForBase(Context, QualType(Init->getBaseClass(), 0)); 3532 if (CheckRedundantInit(*this, Init, Members[Key])) 3533 HadError = true; 3534 } else { 3535 assert(Init->isDelegatingInitializer()); 3536 // This must be the only initializer 3537 if (MemInits.size() != 1) { 3538 Diag(Init->getSourceLocation(), 3539 diag::err_delegating_initializer_alone) 3540 << Init->getSourceRange() << MemInits[i ? 0 : 1]->getSourceRange(); 3541 // We will treat this as being the only initializer. 3542 } 3543 SetDelegatingInitializer(Constructor, MemInits[i]); 3544 // Return immediately as the initializer is set. 3545 return; 3546 } 3547 } 3548 3549 if (HadError) 3550 return; 3551 3552 DiagnoseBaseOrMemInitializerOrder(*this, Constructor, MemInits); 3553 3554 SetCtorInitializers(Constructor, AnyErrors, MemInits); 3555} 3556 3557void 3558Sema::MarkBaseAndMemberDestructorsReferenced(SourceLocation Location, 3559 CXXRecordDecl *ClassDecl) { 3560 // Ignore dependent contexts. Also ignore unions, since their members never 3561 // have destructors implicitly called. 3562 if (ClassDecl->isDependentContext() || ClassDecl->isUnion()) 3563 return; 3564 3565 // FIXME: all the access-control diagnostics are positioned on the 3566 // field/base declaration. That's probably good; that said, the 3567 // user might reasonably want to know why the destructor is being 3568 // emitted, and we currently don't say. 3569 3570 // Non-static data members. 3571 for (CXXRecordDecl::field_iterator I = ClassDecl->field_begin(), 3572 E = ClassDecl->field_end(); I != E; ++I) { 3573 FieldDecl *Field = *I; 3574 if (Field->isInvalidDecl()) 3575 continue; 3576 3577 // Don't destroy incomplete or zero-length arrays. 3578 if (isIncompleteOrZeroLengthArrayType(Context, Field->getType())) 3579 continue; 3580 3581 QualType FieldType = Context.getBaseElementType(Field->getType()); 3582 3583 const RecordType* RT = FieldType->getAs<RecordType>(); 3584 if (!RT) 3585 continue; 3586 3587 CXXRecordDecl *FieldClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3588 if (FieldClassDecl->isInvalidDecl()) 3589 continue; 3590 if (FieldClassDecl->hasIrrelevantDestructor()) 3591 continue; 3592 // The destructor for an implicit anonymous union member is never invoked. 3593 if (FieldClassDecl->isUnion() && FieldClassDecl->isAnonymousStructOrUnion()) 3594 continue; 3595 3596 CXXDestructorDecl *Dtor = LookupDestructor(FieldClassDecl); 3597 assert(Dtor && "No dtor found for FieldClassDecl!"); 3598 CheckDestructorAccess(Field->getLocation(), Dtor, 3599 PDiag(diag::err_access_dtor_field) 3600 << Field->getDeclName() 3601 << FieldType); 3602 3603 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3604 DiagnoseUseOfDecl(Dtor, Location); 3605 } 3606 3607 llvm::SmallPtrSet<const RecordType *, 8> DirectVirtualBases; 3608 3609 // Bases. 3610 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 3611 E = ClassDecl->bases_end(); Base != E; ++Base) { 3612 // Bases are always records in a well-formed non-dependent class. 3613 const RecordType *RT = Base->getType()->getAs<RecordType>(); 3614 3615 // Remember direct virtual bases. 3616 if (Base->isVirtual()) 3617 DirectVirtualBases.insert(RT); 3618 3619 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3620 // If our base class is invalid, we probably can't get its dtor anyway. 3621 if (BaseClassDecl->isInvalidDecl()) 3622 continue; 3623 if (BaseClassDecl->hasIrrelevantDestructor()) 3624 continue; 3625 3626 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3627 assert(Dtor && "No dtor found for BaseClassDecl!"); 3628 3629 // FIXME: caret should be on the start of the class name 3630 CheckDestructorAccess(Base->getLocStart(), Dtor, 3631 PDiag(diag::err_access_dtor_base) 3632 << Base->getType() 3633 << Base->getSourceRange(), 3634 Context.getTypeDeclType(ClassDecl)); 3635 3636 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3637 DiagnoseUseOfDecl(Dtor, Location); 3638 } 3639 3640 // Virtual bases. 3641 for (CXXRecordDecl::base_class_iterator VBase = ClassDecl->vbases_begin(), 3642 E = ClassDecl->vbases_end(); VBase != E; ++VBase) { 3643 3644 // Bases are always records in a well-formed non-dependent class. 3645 const RecordType *RT = VBase->getType()->castAs<RecordType>(); 3646 3647 // Ignore direct virtual bases. 3648 if (DirectVirtualBases.count(RT)) 3649 continue; 3650 3651 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(RT->getDecl()); 3652 // If our base class is invalid, we probably can't get its dtor anyway. 3653 if (BaseClassDecl->isInvalidDecl()) 3654 continue; 3655 if (BaseClassDecl->hasIrrelevantDestructor()) 3656 continue; 3657 3658 CXXDestructorDecl *Dtor = LookupDestructor(BaseClassDecl); 3659 assert(Dtor && "No dtor found for BaseClassDecl!"); 3660 CheckDestructorAccess(ClassDecl->getLocation(), Dtor, 3661 PDiag(diag::err_access_dtor_vbase) 3662 << VBase->getType(), 3663 Context.getTypeDeclType(ClassDecl)); 3664 3665 MarkFunctionReferenced(Location, const_cast<CXXDestructorDecl*>(Dtor)); 3666 DiagnoseUseOfDecl(Dtor, Location); 3667 } 3668} 3669 3670void Sema::ActOnDefaultCtorInitializers(Decl *CDtorDecl) { 3671 if (!CDtorDecl) 3672 return; 3673 3674 if (CXXConstructorDecl *Constructor 3675 = dyn_cast<CXXConstructorDecl>(CDtorDecl)) 3676 SetCtorInitializers(Constructor, /*AnyErrors=*/false); 3677} 3678 3679bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3680 unsigned DiagID, AbstractDiagSelID SelID) { 3681 class NonAbstractTypeDiagnoser : public TypeDiagnoser { 3682 unsigned DiagID; 3683 AbstractDiagSelID SelID; 3684 3685 public: 3686 NonAbstractTypeDiagnoser(unsigned DiagID, AbstractDiagSelID SelID) 3687 : TypeDiagnoser(DiagID == 0), DiagID(DiagID), SelID(SelID) { } 3688 3689 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 3690 if (Suppressed) return; 3691 if (SelID == -1) 3692 S.Diag(Loc, DiagID) << T; 3693 else 3694 S.Diag(Loc, DiagID) << SelID << T; 3695 } 3696 } Diagnoser(DiagID, SelID); 3697 3698 return RequireNonAbstractType(Loc, T, Diagnoser); 3699} 3700 3701bool Sema::RequireNonAbstractType(SourceLocation Loc, QualType T, 3702 TypeDiagnoser &Diagnoser) { 3703 if (!getLangOpts().CPlusPlus) 3704 return false; 3705 3706 if (const ArrayType *AT = Context.getAsArrayType(T)) 3707 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3708 3709 if (const PointerType *PT = T->getAs<PointerType>()) { 3710 // Find the innermost pointer type. 3711 while (const PointerType *T = PT->getPointeeType()->getAs<PointerType>()) 3712 PT = T; 3713 3714 if (const ArrayType *AT = Context.getAsArrayType(PT->getPointeeType())) 3715 return RequireNonAbstractType(Loc, AT->getElementType(), Diagnoser); 3716 } 3717 3718 const RecordType *RT = T->getAs<RecordType>(); 3719 if (!RT) 3720 return false; 3721 3722 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 3723 3724 // We can't answer whether something is abstract until it has a 3725 // definition. If it's currently being defined, we'll walk back 3726 // over all the declarations when we have a full definition. 3727 const CXXRecordDecl *Def = RD->getDefinition(); 3728 if (!Def || Def->isBeingDefined()) 3729 return false; 3730 3731 if (!RD->isAbstract()) 3732 return false; 3733 3734 Diagnoser.diagnose(*this, Loc, T); 3735 DiagnoseAbstractType(RD); 3736 3737 return true; 3738} 3739 3740void Sema::DiagnoseAbstractType(const CXXRecordDecl *RD) { 3741 // Check if we've already emitted the list of pure virtual functions 3742 // for this class. 3743 if (PureVirtualClassDiagSet && PureVirtualClassDiagSet->count(RD)) 3744 return; 3745 3746 CXXFinalOverriderMap FinalOverriders; 3747 RD->getFinalOverriders(FinalOverriders); 3748 3749 // Keep a set of seen pure methods so we won't diagnose the same method 3750 // more than once. 3751 llvm::SmallPtrSet<const CXXMethodDecl *, 8> SeenPureMethods; 3752 3753 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 3754 MEnd = FinalOverriders.end(); 3755 M != MEnd; 3756 ++M) { 3757 for (OverridingMethods::iterator SO = M->second.begin(), 3758 SOEnd = M->second.end(); 3759 SO != SOEnd; ++SO) { 3760 // C++ [class.abstract]p4: 3761 // A class is abstract if it contains or inherits at least one 3762 // pure virtual function for which the final overrider is pure 3763 // virtual. 3764 3765 // 3766 if (SO->second.size() != 1) 3767 continue; 3768 3769 if (!SO->second.front().Method->isPure()) 3770 continue; 3771 3772 if (!SeenPureMethods.insert(SO->second.front().Method)) 3773 continue; 3774 3775 Diag(SO->second.front().Method->getLocation(), 3776 diag::note_pure_virtual_function) 3777 << SO->second.front().Method->getDeclName() << RD->getDeclName(); 3778 } 3779 } 3780 3781 if (!PureVirtualClassDiagSet) 3782 PureVirtualClassDiagSet.reset(new RecordDeclSetTy); 3783 PureVirtualClassDiagSet->insert(RD); 3784} 3785 3786namespace { 3787struct AbstractUsageInfo { 3788 Sema &S; 3789 CXXRecordDecl *Record; 3790 CanQualType AbstractType; 3791 bool Invalid; 3792 3793 AbstractUsageInfo(Sema &S, CXXRecordDecl *Record) 3794 : S(S), Record(Record), 3795 AbstractType(S.Context.getCanonicalType( 3796 S.Context.getTypeDeclType(Record))), 3797 Invalid(false) {} 3798 3799 void DiagnoseAbstractType() { 3800 if (Invalid) return; 3801 S.DiagnoseAbstractType(Record); 3802 Invalid = true; 3803 } 3804 3805 void CheckType(const NamedDecl *D, TypeLoc TL, Sema::AbstractDiagSelID Sel); 3806}; 3807 3808struct CheckAbstractUsage { 3809 AbstractUsageInfo &Info; 3810 const NamedDecl *Ctx; 3811 3812 CheckAbstractUsage(AbstractUsageInfo &Info, const NamedDecl *Ctx) 3813 : Info(Info), Ctx(Ctx) {} 3814 3815 void Visit(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3816 switch (TL.getTypeLocClass()) { 3817#define ABSTRACT_TYPELOC(CLASS, PARENT) 3818#define TYPELOC(CLASS, PARENT) \ 3819 case TypeLoc::CLASS: Check(TL.castAs<CLASS##TypeLoc>(), Sel); break; 3820#include "clang/AST/TypeLocNodes.def" 3821 } 3822 } 3823 3824 void Check(FunctionProtoTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3825 Visit(TL.getResultLoc(), Sema::AbstractReturnType); 3826 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3827 if (!TL.getArg(I)) 3828 continue; 3829 3830 TypeSourceInfo *TSI = TL.getArg(I)->getTypeSourceInfo(); 3831 if (TSI) Visit(TSI->getTypeLoc(), Sema::AbstractParamType); 3832 } 3833 } 3834 3835 void Check(ArrayTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3836 Visit(TL.getElementLoc(), Sema::AbstractArrayType); 3837 } 3838 3839 void Check(TemplateSpecializationTypeLoc TL, Sema::AbstractDiagSelID Sel) { 3840 // Visit the type parameters from a permissive context. 3841 for (unsigned I = 0, E = TL.getNumArgs(); I != E; ++I) { 3842 TemplateArgumentLoc TAL = TL.getArgLoc(I); 3843 if (TAL.getArgument().getKind() == TemplateArgument::Type) 3844 if (TypeSourceInfo *TSI = TAL.getTypeSourceInfo()) 3845 Visit(TSI->getTypeLoc(), Sema::AbstractNone); 3846 // TODO: other template argument types? 3847 } 3848 } 3849 3850 // Visit pointee types from a permissive context. 3851#define CheckPolymorphic(Type) \ 3852 void Check(Type TL, Sema::AbstractDiagSelID Sel) { \ 3853 Visit(TL.getNextTypeLoc(), Sema::AbstractNone); \ 3854 } 3855 CheckPolymorphic(PointerTypeLoc) 3856 CheckPolymorphic(ReferenceTypeLoc) 3857 CheckPolymorphic(MemberPointerTypeLoc) 3858 CheckPolymorphic(BlockPointerTypeLoc) 3859 CheckPolymorphic(AtomicTypeLoc) 3860 3861 /// Handle all the types we haven't given a more specific 3862 /// implementation for above. 3863 void Check(TypeLoc TL, Sema::AbstractDiagSelID Sel) { 3864 // Every other kind of type that we haven't called out already 3865 // that has an inner type is either (1) sugar or (2) contains that 3866 // inner type in some way as a subobject. 3867 if (TypeLoc Next = TL.getNextTypeLoc()) 3868 return Visit(Next, Sel); 3869 3870 // If there's no inner type and we're in a permissive context, 3871 // don't diagnose. 3872 if (Sel == Sema::AbstractNone) return; 3873 3874 // Check whether the type matches the abstract type. 3875 QualType T = TL.getType(); 3876 if (T->isArrayType()) { 3877 Sel = Sema::AbstractArrayType; 3878 T = Info.S.Context.getBaseElementType(T); 3879 } 3880 CanQualType CT = T->getCanonicalTypeUnqualified().getUnqualifiedType(); 3881 if (CT != Info.AbstractType) return; 3882 3883 // It matched; do some magic. 3884 if (Sel == Sema::AbstractArrayType) { 3885 Info.S.Diag(Ctx->getLocation(), diag::err_array_of_abstract_type) 3886 << T << TL.getSourceRange(); 3887 } else { 3888 Info.S.Diag(Ctx->getLocation(), diag::err_abstract_type_in_decl) 3889 << Sel << T << TL.getSourceRange(); 3890 } 3891 Info.DiagnoseAbstractType(); 3892 } 3893}; 3894 3895void AbstractUsageInfo::CheckType(const NamedDecl *D, TypeLoc TL, 3896 Sema::AbstractDiagSelID Sel) { 3897 CheckAbstractUsage(*this, D).Visit(TL, Sel); 3898} 3899 3900} 3901 3902/// Check for invalid uses of an abstract type in a method declaration. 3903static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3904 CXXMethodDecl *MD) { 3905 // No need to do the check on definitions, which require that 3906 // the return/param types be complete. 3907 if (MD->doesThisDeclarationHaveABody()) 3908 return; 3909 3910 // For safety's sake, just ignore it if we don't have type source 3911 // information. This should never happen for non-implicit methods, 3912 // but... 3913 if (TypeSourceInfo *TSI = MD->getTypeSourceInfo()) 3914 Info.CheckType(MD, TSI->getTypeLoc(), Sema::AbstractNone); 3915} 3916 3917/// Check for invalid uses of an abstract type within a class definition. 3918static void CheckAbstractClassUsage(AbstractUsageInfo &Info, 3919 CXXRecordDecl *RD) { 3920 for (CXXRecordDecl::decl_iterator 3921 I = RD->decls_begin(), E = RD->decls_end(); I != E; ++I) { 3922 Decl *D = *I; 3923 if (D->isImplicit()) continue; 3924 3925 // Methods and method templates. 3926 if (isa<CXXMethodDecl>(D)) { 3927 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(D)); 3928 } else if (isa<FunctionTemplateDecl>(D)) { 3929 FunctionDecl *FD = cast<FunctionTemplateDecl>(D)->getTemplatedDecl(); 3930 CheckAbstractClassUsage(Info, cast<CXXMethodDecl>(FD)); 3931 3932 // Fields and static variables. 3933 } else if (isa<FieldDecl>(D)) { 3934 FieldDecl *FD = cast<FieldDecl>(D); 3935 if (TypeSourceInfo *TSI = FD->getTypeSourceInfo()) 3936 Info.CheckType(FD, TSI->getTypeLoc(), Sema::AbstractFieldType); 3937 } else if (isa<VarDecl>(D)) { 3938 VarDecl *VD = cast<VarDecl>(D); 3939 if (TypeSourceInfo *TSI = VD->getTypeSourceInfo()) 3940 Info.CheckType(VD, TSI->getTypeLoc(), Sema::AbstractVariableType); 3941 3942 // Nested classes and class templates. 3943 } else if (isa<CXXRecordDecl>(D)) { 3944 CheckAbstractClassUsage(Info, cast<CXXRecordDecl>(D)); 3945 } else if (isa<ClassTemplateDecl>(D)) { 3946 CheckAbstractClassUsage(Info, 3947 cast<ClassTemplateDecl>(D)->getTemplatedDecl()); 3948 } 3949 } 3950} 3951 3952/// \brief Perform semantic checks on a class definition that has been 3953/// completing, introducing implicitly-declared members, checking for 3954/// abstract types, etc. 3955void Sema::CheckCompletedCXXClass(CXXRecordDecl *Record) { 3956 if (!Record) 3957 return; 3958 3959 if (Record->isAbstract() && !Record->isInvalidDecl()) { 3960 AbstractUsageInfo Info(*this, Record); 3961 CheckAbstractClassUsage(Info, Record); 3962 } 3963 3964 // If this is not an aggregate type and has no user-declared constructor, 3965 // complain about any non-static data members of reference or const scalar 3966 // type, since they will never get initializers. 3967 if (!Record->isInvalidDecl() && !Record->isDependentType() && 3968 !Record->isAggregate() && !Record->hasUserDeclaredConstructor() && 3969 !Record->isLambda()) { 3970 bool Complained = false; 3971 for (RecordDecl::field_iterator F = Record->field_begin(), 3972 FEnd = Record->field_end(); 3973 F != FEnd; ++F) { 3974 if (F->hasInClassInitializer() || F->isUnnamedBitfield()) 3975 continue; 3976 3977 if (F->getType()->isReferenceType() || 3978 (F->getType().isConstQualified() && F->getType()->isScalarType())) { 3979 if (!Complained) { 3980 Diag(Record->getLocation(), diag::warn_no_constructor_for_refconst) 3981 << Record->getTagKind() << Record; 3982 Complained = true; 3983 } 3984 3985 Diag(F->getLocation(), diag::note_refconst_member_not_initialized) 3986 << F->getType()->isReferenceType() 3987 << F->getDeclName(); 3988 } 3989 } 3990 } 3991 3992 if (Record->isDynamicClass() && !Record->isDependentType()) 3993 DynamicClasses.push_back(Record); 3994 3995 if (Record->getIdentifier()) { 3996 // C++ [class.mem]p13: 3997 // If T is the name of a class, then each of the following shall have a 3998 // name different from T: 3999 // - every member of every anonymous union that is a member of class T. 4000 // 4001 // C++ [class.mem]p14: 4002 // In addition, if class T has a user-declared constructor (12.1), every 4003 // non-static data member of class T shall have a name different from T. 4004 DeclContext::lookup_result R = Record->lookup(Record->getDeclName()); 4005 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 4006 ++I) { 4007 NamedDecl *D = *I; 4008 if ((isa<FieldDecl>(D) && Record->hasUserDeclaredConstructor()) || 4009 isa<IndirectFieldDecl>(D)) { 4010 Diag(D->getLocation(), diag::err_member_name_of_class) 4011 << D->getDeclName(); 4012 break; 4013 } 4014 } 4015 } 4016 4017 // Warn if the class has virtual methods but non-virtual public destructor. 4018 if (Record->isPolymorphic() && !Record->isDependentType()) { 4019 CXXDestructorDecl *dtor = Record->getDestructor(); 4020 if (!dtor || (!dtor->isVirtual() && dtor->getAccess() == AS_public)) 4021 Diag(dtor ? dtor->getLocation() : Record->getLocation(), 4022 diag::warn_non_virtual_dtor) << Context.getRecordType(Record); 4023 } 4024 4025 if (Record->isAbstract() && Record->hasAttr<FinalAttr>()) { 4026 Diag(Record->getLocation(), diag::warn_abstract_final_class); 4027 DiagnoseAbstractType(Record); 4028 } 4029 4030 if (!Record->isDependentType()) { 4031 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4032 MEnd = Record->method_end(); 4033 M != MEnd; ++M) { 4034 // See if a method overloads virtual methods in a base 4035 // class without overriding any. 4036 if (!M->isStatic()) 4037 DiagnoseHiddenVirtualMethods(Record, *M); 4038 4039 // Check whether the explicitly-defaulted special members are valid. 4040 if (!M->isInvalidDecl() && M->isExplicitlyDefaulted()) 4041 CheckExplicitlyDefaultedSpecialMember(*M); 4042 4043 // For an explicitly defaulted or deleted special member, we defer 4044 // determining triviality until the class is complete. That time is now! 4045 if (!M->isImplicit() && !M->isUserProvided()) { 4046 CXXSpecialMember CSM = getSpecialMember(*M); 4047 if (CSM != CXXInvalid) { 4048 M->setTrivial(SpecialMemberIsTrivial(*M, CSM)); 4049 4050 // Inform the class that we've finished declaring this member. 4051 Record->finishedDefaultedOrDeletedMember(*M); 4052 } 4053 } 4054 } 4055 } 4056 4057 // C++11 [dcl.constexpr]p8: A constexpr specifier for a non-static member 4058 // function that is not a constructor declares that member function to be 4059 // const. [...] The class of which that function is a member shall be 4060 // a literal type. 4061 // 4062 // If the class has virtual bases, any constexpr members will already have 4063 // been diagnosed by the checks performed on the member declaration, so 4064 // suppress this (less useful) diagnostic. 4065 // 4066 // We delay this until we know whether an explicitly-defaulted (or deleted) 4067 // destructor for the class is trivial. 4068 if (LangOpts.CPlusPlus11 && !Record->isDependentType() && 4069 !Record->isLiteral() && !Record->getNumVBases()) { 4070 for (CXXRecordDecl::method_iterator M = Record->method_begin(), 4071 MEnd = Record->method_end(); 4072 M != MEnd; ++M) { 4073 if (M->isConstexpr() && M->isInstance() && !isa<CXXConstructorDecl>(*M)) { 4074 switch (Record->getTemplateSpecializationKind()) { 4075 case TSK_ImplicitInstantiation: 4076 case TSK_ExplicitInstantiationDeclaration: 4077 case TSK_ExplicitInstantiationDefinition: 4078 // If a template instantiates to a non-literal type, but its members 4079 // instantiate to constexpr functions, the template is technically 4080 // ill-formed, but we allow it for sanity. 4081 continue; 4082 4083 case TSK_Undeclared: 4084 case TSK_ExplicitSpecialization: 4085 RequireLiteralType(M->getLocation(), Context.getRecordType(Record), 4086 diag::err_constexpr_method_non_literal); 4087 break; 4088 } 4089 4090 // Only produce one error per class. 4091 break; 4092 } 4093 } 4094 } 4095 4096 // Declare inheriting constructors. We do this eagerly here because: 4097 // - The standard requires an eager diagnostic for conflicting inheriting 4098 // constructors from different classes. 4099 // - The lazy declaration of the other implicit constructors is so as to not 4100 // waste space and performance on classes that are not meant to be 4101 // instantiated (e.g. meta-functions). This doesn't apply to classes that 4102 // have inheriting constructors. 4103 DeclareInheritingConstructors(Record); 4104} 4105 4106/// Is the special member function which would be selected to perform the 4107/// specified operation on the specified class type a constexpr constructor? 4108static bool specialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4109 Sema::CXXSpecialMember CSM, 4110 bool ConstArg) { 4111 Sema::SpecialMemberOverloadResult *SMOR = 4112 S.LookupSpecialMember(ClassDecl, CSM, ConstArg, 4113 false, false, false, false); 4114 if (!SMOR || !SMOR->getMethod()) 4115 // A constructor we wouldn't select can't be "involved in initializing" 4116 // anything. 4117 return true; 4118 return SMOR->getMethod()->isConstexpr(); 4119} 4120 4121/// Determine whether the specified special member function would be constexpr 4122/// if it were implicitly defined. 4123static bool defaultedSpecialMemberIsConstexpr(Sema &S, CXXRecordDecl *ClassDecl, 4124 Sema::CXXSpecialMember CSM, 4125 bool ConstArg) { 4126 if (!S.getLangOpts().CPlusPlus11) 4127 return false; 4128 4129 // C++11 [dcl.constexpr]p4: 4130 // In the definition of a constexpr constructor [...] 4131 switch (CSM) { 4132 case Sema::CXXDefaultConstructor: 4133 // Since default constructor lookup is essentially trivial (and cannot 4134 // involve, for instance, template instantiation), we compute whether a 4135 // defaulted default constructor is constexpr directly within CXXRecordDecl. 4136 // 4137 // This is important for performance; we need to know whether the default 4138 // constructor is constexpr to determine whether the type is a literal type. 4139 return ClassDecl->defaultedDefaultConstructorIsConstexpr(); 4140 4141 case Sema::CXXCopyConstructor: 4142 case Sema::CXXMoveConstructor: 4143 // For copy or move constructors, we need to perform overload resolution. 4144 break; 4145 4146 case Sema::CXXCopyAssignment: 4147 case Sema::CXXMoveAssignment: 4148 case Sema::CXXDestructor: 4149 case Sema::CXXInvalid: 4150 return false; 4151 } 4152 4153 // -- if the class is a non-empty union, or for each non-empty anonymous 4154 // union member of a non-union class, exactly one non-static data member 4155 // shall be initialized; [DR1359] 4156 // 4157 // If we squint, this is guaranteed, since exactly one non-static data member 4158 // will be initialized (if the constructor isn't deleted), we just don't know 4159 // which one. 4160 if (ClassDecl->isUnion()) 4161 return true; 4162 4163 // -- the class shall not have any virtual base classes; 4164 if (ClassDecl->getNumVBases()) 4165 return false; 4166 4167 // -- every constructor involved in initializing [...] base class 4168 // sub-objects shall be a constexpr constructor; 4169 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 4170 BEnd = ClassDecl->bases_end(); 4171 B != BEnd; ++B) { 4172 const RecordType *BaseType = B->getType()->getAs<RecordType>(); 4173 if (!BaseType) continue; 4174 4175 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 4176 if (!specialMemberIsConstexpr(S, BaseClassDecl, CSM, ConstArg)) 4177 return false; 4178 } 4179 4180 // -- every constructor involved in initializing non-static data members 4181 // [...] shall be a constexpr constructor; 4182 // -- every non-static data member and base class sub-object shall be 4183 // initialized 4184 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 4185 FEnd = ClassDecl->field_end(); 4186 F != FEnd; ++F) { 4187 if (F->isInvalidDecl()) 4188 continue; 4189 if (const RecordType *RecordTy = 4190 S.Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 4191 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 4192 if (!specialMemberIsConstexpr(S, FieldRecDecl, CSM, ConstArg)) 4193 return false; 4194 } 4195 } 4196 4197 // All OK, it's constexpr! 4198 return true; 4199} 4200 4201static Sema::ImplicitExceptionSpecification 4202computeImplicitExceptionSpec(Sema &S, SourceLocation Loc, CXXMethodDecl *MD) { 4203 switch (S.getSpecialMember(MD)) { 4204 case Sema::CXXDefaultConstructor: 4205 return S.ComputeDefaultedDefaultCtorExceptionSpec(Loc, MD); 4206 case Sema::CXXCopyConstructor: 4207 return S.ComputeDefaultedCopyCtorExceptionSpec(MD); 4208 case Sema::CXXCopyAssignment: 4209 return S.ComputeDefaultedCopyAssignmentExceptionSpec(MD); 4210 case Sema::CXXMoveConstructor: 4211 return S.ComputeDefaultedMoveCtorExceptionSpec(MD); 4212 case Sema::CXXMoveAssignment: 4213 return S.ComputeDefaultedMoveAssignmentExceptionSpec(MD); 4214 case Sema::CXXDestructor: 4215 return S.ComputeDefaultedDtorExceptionSpec(MD); 4216 case Sema::CXXInvalid: 4217 break; 4218 } 4219 assert(cast<CXXConstructorDecl>(MD)->getInheritedConstructor() && 4220 "only special members have implicit exception specs"); 4221 return S.ComputeInheritingCtorExceptionSpec(cast<CXXConstructorDecl>(MD)); 4222} 4223 4224static void 4225updateExceptionSpec(Sema &S, FunctionDecl *FD, const FunctionProtoType *FPT, 4226 const Sema::ImplicitExceptionSpecification &ExceptSpec) { 4227 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4228 ExceptSpec.getEPI(EPI); 4229 const FunctionProtoType *NewFPT = cast<FunctionProtoType>( 4230 S.Context.getFunctionType(FPT->getResultType(), FPT->getArgTypes(), EPI)); 4231 FD->setType(QualType(NewFPT, 0)); 4232} 4233 4234void Sema::EvaluateImplicitExceptionSpec(SourceLocation Loc, CXXMethodDecl *MD) { 4235 const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>(); 4236 if (FPT->getExceptionSpecType() != EST_Unevaluated) 4237 return; 4238 4239 // Evaluate the exception specification. 4240 ImplicitExceptionSpecification ExceptSpec = 4241 computeImplicitExceptionSpec(*this, Loc, MD); 4242 4243 // Update the type of the special member to use it. 4244 updateExceptionSpec(*this, MD, FPT, ExceptSpec); 4245 4246 // A user-provided destructor can be defined outside the class. When that 4247 // happens, be sure to update the exception specification on both 4248 // declarations. 4249 const FunctionProtoType *CanonicalFPT = 4250 MD->getCanonicalDecl()->getType()->castAs<FunctionProtoType>(); 4251 if (CanonicalFPT->getExceptionSpecType() == EST_Unevaluated) 4252 updateExceptionSpec(*this, MD->getCanonicalDecl(), 4253 CanonicalFPT, ExceptSpec); 4254} 4255 4256void Sema::CheckExplicitlyDefaultedSpecialMember(CXXMethodDecl *MD) { 4257 CXXRecordDecl *RD = MD->getParent(); 4258 CXXSpecialMember CSM = getSpecialMember(MD); 4259 4260 assert(MD->isExplicitlyDefaulted() && CSM != CXXInvalid && 4261 "not an explicitly-defaulted special member"); 4262 4263 // Whether this was the first-declared instance of the constructor. 4264 // This affects whether we implicitly add an exception spec and constexpr. 4265 bool First = MD == MD->getCanonicalDecl(); 4266 4267 bool HadError = false; 4268 4269 // C++11 [dcl.fct.def.default]p1: 4270 // A function that is explicitly defaulted shall 4271 // -- be a special member function (checked elsewhere), 4272 // -- have the same type (except for ref-qualifiers, and except that a 4273 // copy operation can take a non-const reference) as an implicit 4274 // declaration, and 4275 // -- not have default arguments. 4276 unsigned ExpectedParams = 1; 4277 if (CSM == CXXDefaultConstructor || CSM == CXXDestructor) 4278 ExpectedParams = 0; 4279 if (MD->getNumParams() != ExpectedParams) { 4280 // This also checks for default arguments: a copy or move constructor with a 4281 // default argument is classified as a default constructor, and assignment 4282 // operations and destructors can't have default arguments. 4283 Diag(MD->getLocation(), diag::err_defaulted_special_member_params) 4284 << CSM << MD->getSourceRange(); 4285 HadError = true; 4286 } else if (MD->isVariadic()) { 4287 Diag(MD->getLocation(), diag::err_defaulted_special_member_variadic) 4288 << CSM << MD->getSourceRange(); 4289 HadError = true; 4290 } 4291 4292 const FunctionProtoType *Type = MD->getType()->getAs<FunctionProtoType>(); 4293 4294 bool CanHaveConstParam = false; 4295 if (CSM == CXXCopyConstructor) 4296 CanHaveConstParam = RD->implicitCopyConstructorHasConstParam(); 4297 else if (CSM == CXXCopyAssignment) 4298 CanHaveConstParam = RD->implicitCopyAssignmentHasConstParam(); 4299 4300 QualType ReturnType = Context.VoidTy; 4301 if (CSM == CXXCopyAssignment || CSM == CXXMoveAssignment) { 4302 // Check for return type matching. 4303 ReturnType = Type->getResultType(); 4304 QualType ExpectedReturnType = 4305 Context.getLValueReferenceType(Context.getTypeDeclType(RD)); 4306 if (!Context.hasSameType(ReturnType, ExpectedReturnType)) { 4307 Diag(MD->getLocation(), diag::err_defaulted_special_member_return_type) 4308 << (CSM == CXXMoveAssignment) << ExpectedReturnType; 4309 HadError = true; 4310 } 4311 4312 // A defaulted special member cannot have cv-qualifiers. 4313 if (Type->getTypeQuals()) { 4314 Diag(MD->getLocation(), diag::err_defaulted_special_member_quals) 4315 << (CSM == CXXMoveAssignment); 4316 HadError = true; 4317 } 4318 } 4319 4320 // Check for parameter type matching. 4321 QualType ArgType = ExpectedParams ? Type->getArgType(0) : QualType(); 4322 bool HasConstParam = false; 4323 if (ExpectedParams && ArgType->isReferenceType()) { 4324 // Argument must be reference to possibly-const T. 4325 QualType ReferentType = ArgType->getPointeeType(); 4326 HasConstParam = ReferentType.isConstQualified(); 4327 4328 if (ReferentType.isVolatileQualified()) { 4329 Diag(MD->getLocation(), 4330 diag::err_defaulted_special_member_volatile_param) << CSM; 4331 HadError = true; 4332 } 4333 4334 if (HasConstParam && !CanHaveConstParam) { 4335 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) { 4336 Diag(MD->getLocation(), 4337 diag::err_defaulted_special_member_copy_const_param) 4338 << (CSM == CXXCopyAssignment); 4339 // FIXME: Explain why this special member can't be const. 4340 } else { 4341 Diag(MD->getLocation(), 4342 diag::err_defaulted_special_member_move_const_param) 4343 << (CSM == CXXMoveAssignment); 4344 } 4345 HadError = true; 4346 } 4347 } else if (ExpectedParams) { 4348 // A copy assignment operator can take its argument by value, but a 4349 // defaulted one cannot. 4350 assert(CSM == CXXCopyAssignment && "unexpected non-ref argument"); 4351 Diag(MD->getLocation(), diag::err_defaulted_copy_assign_not_ref); 4352 HadError = true; 4353 } 4354 4355 // C++11 [dcl.fct.def.default]p2: 4356 // An explicitly-defaulted function may be declared constexpr only if it 4357 // would have been implicitly declared as constexpr, 4358 // Do not apply this rule to members of class templates, since core issue 1358 4359 // makes such functions always instantiate to constexpr functions. For 4360 // non-constructors, this is checked elsewhere. 4361 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, RD, CSM, 4362 HasConstParam); 4363 if (isa<CXXConstructorDecl>(MD) && MD->isConstexpr() && !Constexpr && 4364 MD->getTemplatedKind() == FunctionDecl::TK_NonTemplate) { 4365 Diag(MD->getLocStart(), diag::err_incorrect_defaulted_constexpr) << CSM; 4366 // FIXME: Explain why the constructor can't be constexpr. 4367 HadError = true; 4368 } 4369 4370 // and may have an explicit exception-specification only if it is compatible 4371 // with the exception-specification on the implicit declaration. 4372 if (Type->hasExceptionSpec()) { 4373 // Delay the check if this is the first declaration of the special member, 4374 // since we may not have parsed some necessary in-class initializers yet. 4375 if (First) 4376 DelayedDefaultedMemberExceptionSpecs.push_back(std::make_pair(MD, Type)); 4377 else 4378 CheckExplicitlyDefaultedMemberExceptionSpec(MD, Type); 4379 } 4380 4381 // If a function is explicitly defaulted on its first declaration, 4382 if (First) { 4383 // -- it is implicitly considered to be constexpr if the implicit 4384 // definition would be, 4385 MD->setConstexpr(Constexpr); 4386 4387 // -- it is implicitly considered to have the same exception-specification 4388 // as if it had been implicitly declared, 4389 FunctionProtoType::ExtProtoInfo EPI = Type->getExtProtoInfo(); 4390 EPI.ExceptionSpecType = EST_Unevaluated; 4391 EPI.ExceptionSpecDecl = MD; 4392 MD->setType(Context.getFunctionType(ReturnType, 4393 ArrayRef<QualType>(&ArgType, 4394 ExpectedParams), 4395 EPI)); 4396 } 4397 4398 if (ShouldDeleteSpecialMember(MD, CSM)) { 4399 if (First) { 4400 MD->setDeletedAsWritten(); 4401 } else { 4402 // C++11 [dcl.fct.def.default]p4: 4403 // [For a] user-provided explicitly-defaulted function [...] if such a 4404 // function is implicitly defined as deleted, the program is ill-formed. 4405 Diag(MD->getLocation(), diag::err_out_of_line_default_deletes) << CSM; 4406 HadError = true; 4407 } 4408 } 4409 4410 if (HadError) 4411 MD->setInvalidDecl(); 4412} 4413 4414/// Check whether the exception specification provided for an 4415/// explicitly-defaulted special member matches the exception specification 4416/// that would have been generated for an implicit special member, per 4417/// C++11 [dcl.fct.def.default]p2. 4418void Sema::CheckExplicitlyDefaultedMemberExceptionSpec( 4419 CXXMethodDecl *MD, const FunctionProtoType *SpecifiedType) { 4420 // Compute the implicit exception specification. 4421 FunctionProtoType::ExtProtoInfo EPI; 4422 computeImplicitExceptionSpec(*this, MD->getLocation(), MD).getEPI(EPI); 4423 const FunctionProtoType *ImplicitType = cast<FunctionProtoType>( 4424 Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI)); 4425 4426 // Ensure that it matches. 4427 CheckEquivalentExceptionSpec( 4428 PDiag(diag::err_incorrect_defaulted_exception_spec) 4429 << getSpecialMember(MD), PDiag(), 4430 ImplicitType, SourceLocation(), 4431 SpecifiedType, MD->getLocation()); 4432} 4433 4434void Sema::CheckDelayedExplicitlyDefaultedMemberExceptionSpecs() { 4435 for (unsigned I = 0, N = DelayedDefaultedMemberExceptionSpecs.size(); 4436 I != N; ++I) 4437 CheckExplicitlyDefaultedMemberExceptionSpec( 4438 DelayedDefaultedMemberExceptionSpecs[I].first, 4439 DelayedDefaultedMemberExceptionSpecs[I].second); 4440 4441 DelayedDefaultedMemberExceptionSpecs.clear(); 4442} 4443 4444namespace { 4445struct SpecialMemberDeletionInfo { 4446 Sema &S; 4447 CXXMethodDecl *MD; 4448 Sema::CXXSpecialMember CSM; 4449 bool Diagnose; 4450 4451 // Properties of the special member, computed for convenience. 4452 bool IsConstructor, IsAssignment, IsMove, ConstArg, VolatileArg; 4453 SourceLocation Loc; 4454 4455 bool AllFieldsAreConst; 4456 4457 SpecialMemberDeletionInfo(Sema &S, CXXMethodDecl *MD, 4458 Sema::CXXSpecialMember CSM, bool Diagnose) 4459 : S(S), MD(MD), CSM(CSM), Diagnose(Diagnose), 4460 IsConstructor(false), IsAssignment(false), IsMove(false), 4461 ConstArg(false), VolatileArg(false), Loc(MD->getLocation()), 4462 AllFieldsAreConst(true) { 4463 switch (CSM) { 4464 case Sema::CXXDefaultConstructor: 4465 case Sema::CXXCopyConstructor: 4466 IsConstructor = true; 4467 break; 4468 case Sema::CXXMoveConstructor: 4469 IsConstructor = true; 4470 IsMove = true; 4471 break; 4472 case Sema::CXXCopyAssignment: 4473 IsAssignment = true; 4474 break; 4475 case Sema::CXXMoveAssignment: 4476 IsAssignment = true; 4477 IsMove = true; 4478 break; 4479 case Sema::CXXDestructor: 4480 break; 4481 case Sema::CXXInvalid: 4482 llvm_unreachable("invalid special member kind"); 4483 } 4484 4485 if (MD->getNumParams()) { 4486 ConstArg = MD->getParamDecl(0)->getType().isConstQualified(); 4487 VolatileArg = MD->getParamDecl(0)->getType().isVolatileQualified(); 4488 } 4489 } 4490 4491 bool inUnion() const { return MD->getParent()->isUnion(); } 4492 4493 /// Look up the corresponding special member in the given class. 4494 Sema::SpecialMemberOverloadResult *lookupIn(CXXRecordDecl *Class, 4495 unsigned Quals) { 4496 unsigned TQ = MD->getTypeQualifiers(); 4497 // cv-qualifiers on class members don't affect default ctor / dtor calls. 4498 if (CSM == Sema::CXXDefaultConstructor || CSM == Sema::CXXDestructor) 4499 Quals = 0; 4500 return S.LookupSpecialMember(Class, CSM, 4501 ConstArg || (Quals & Qualifiers::Const), 4502 VolatileArg || (Quals & Qualifiers::Volatile), 4503 MD->getRefQualifier() == RQ_RValue, 4504 TQ & Qualifiers::Const, 4505 TQ & Qualifiers::Volatile); 4506 } 4507 4508 typedef llvm::PointerUnion<CXXBaseSpecifier*, FieldDecl*> Subobject; 4509 4510 bool shouldDeleteForBase(CXXBaseSpecifier *Base); 4511 bool shouldDeleteForField(FieldDecl *FD); 4512 bool shouldDeleteForAllConstMembers(); 4513 4514 bool shouldDeleteForClassSubobject(CXXRecordDecl *Class, Subobject Subobj, 4515 unsigned Quals); 4516 bool shouldDeleteForSubobjectCall(Subobject Subobj, 4517 Sema::SpecialMemberOverloadResult *SMOR, 4518 bool IsDtorCallInCtor); 4519 4520 bool isAccessible(Subobject Subobj, CXXMethodDecl *D); 4521}; 4522} 4523 4524/// Is the given special member inaccessible when used on the given 4525/// sub-object. 4526bool SpecialMemberDeletionInfo::isAccessible(Subobject Subobj, 4527 CXXMethodDecl *target) { 4528 /// If we're operating on a base class, the object type is the 4529 /// type of this special member. 4530 QualType objectTy; 4531 AccessSpecifier access = target->getAccess(); 4532 if (CXXBaseSpecifier *base = Subobj.dyn_cast<CXXBaseSpecifier*>()) { 4533 objectTy = S.Context.getTypeDeclType(MD->getParent()); 4534 access = CXXRecordDecl::MergeAccess(base->getAccessSpecifier(), access); 4535 4536 // If we're operating on a field, the object type is the type of the field. 4537 } else { 4538 objectTy = S.Context.getTypeDeclType(target->getParent()); 4539 } 4540 4541 return S.isSpecialMemberAccessibleForDeletion(target, access, objectTy); 4542} 4543 4544/// Check whether we should delete a special member due to the implicit 4545/// definition containing a call to a special member of a subobject. 4546bool SpecialMemberDeletionInfo::shouldDeleteForSubobjectCall( 4547 Subobject Subobj, Sema::SpecialMemberOverloadResult *SMOR, 4548 bool IsDtorCallInCtor) { 4549 CXXMethodDecl *Decl = SMOR->getMethod(); 4550 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4551 4552 int DiagKind = -1; 4553 4554 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::NoMemberOrDeleted) 4555 DiagKind = !Decl ? 0 : 1; 4556 else if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4557 DiagKind = 2; 4558 else if (!isAccessible(Subobj, Decl)) 4559 DiagKind = 3; 4560 else if (!IsDtorCallInCtor && Field && Field->getParent()->isUnion() && 4561 !Decl->isTrivial()) { 4562 // A member of a union must have a trivial corresponding special member. 4563 // As a weird special case, a destructor call from a union's constructor 4564 // must be accessible and non-deleted, but need not be trivial. Such a 4565 // destructor is never actually called, but is semantically checked as 4566 // if it were. 4567 DiagKind = 4; 4568 } 4569 4570 if (DiagKind == -1) 4571 return false; 4572 4573 if (Diagnose) { 4574 if (Field) { 4575 S.Diag(Field->getLocation(), 4576 diag::note_deleted_special_member_class_subobject) 4577 << CSM << MD->getParent() << /*IsField*/true 4578 << Field << DiagKind << IsDtorCallInCtor; 4579 } else { 4580 CXXBaseSpecifier *Base = Subobj.get<CXXBaseSpecifier*>(); 4581 S.Diag(Base->getLocStart(), 4582 diag::note_deleted_special_member_class_subobject) 4583 << CSM << MD->getParent() << /*IsField*/false 4584 << Base->getType() << DiagKind << IsDtorCallInCtor; 4585 } 4586 4587 if (DiagKind == 1) 4588 S.NoteDeletedFunction(Decl); 4589 // FIXME: Explain inaccessibility if DiagKind == 3. 4590 } 4591 4592 return true; 4593} 4594 4595/// Check whether we should delete a special member function due to having a 4596/// direct or virtual base class or non-static data member of class type M. 4597bool SpecialMemberDeletionInfo::shouldDeleteForClassSubobject( 4598 CXXRecordDecl *Class, Subobject Subobj, unsigned Quals) { 4599 FieldDecl *Field = Subobj.dyn_cast<FieldDecl*>(); 4600 4601 // C++11 [class.ctor]p5: 4602 // -- any direct or virtual base class, or non-static data member with no 4603 // brace-or-equal-initializer, has class type M (or array thereof) and 4604 // either M has no default constructor or overload resolution as applied 4605 // to M's default constructor results in an ambiguity or in a function 4606 // that is deleted or inaccessible 4607 // C++11 [class.copy]p11, C++11 [class.copy]p23: 4608 // -- a direct or virtual base class B that cannot be copied/moved because 4609 // overload resolution, as applied to B's corresponding special member, 4610 // results in an ambiguity or a function that is deleted or inaccessible 4611 // from the defaulted special member 4612 // C++11 [class.dtor]p5: 4613 // -- any direct or virtual base class [...] has a type with a destructor 4614 // that is deleted or inaccessible 4615 if (!(CSM == Sema::CXXDefaultConstructor && 4616 Field && Field->hasInClassInitializer()) && 4617 shouldDeleteForSubobjectCall(Subobj, lookupIn(Class, Quals), false)) 4618 return true; 4619 4620 // C++11 [class.ctor]p5, C++11 [class.copy]p11: 4621 // -- any direct or virtual base class or non-static data member has a 4622 // type with a destructor that is deleted or inaccessible 4623 if (IsConstructor) { 4624 Sema::SpecialMemberOverloadResult *SMOR = 4625 S.LookupSpecialMember(Class, Sema::CXXDestructor, 4626 false, false, false, false, false); 4627 if (shouldDeleteForSubobjectCall(Subobj, SMOR, true)) 4628 return true; 4629 } 4630 4631 return false; 4632} 4633 4634/// Check whether we should delete a special member function due to the class 4635/// having a particular direct or virtual base class. 4636bool SpecialMemberDeletionInfo::shouldDeleteForBase(CXXBaseSpecifier *Base) { 4637 CXXRecordDecl *BaseClass = Base->getType()->getAsCXXRecordDecl(); 4638 return shouldDeleteForClassSubobject(BaseClass, Base, 0); 4639} 4640 4641/// Check whether we should delete a special member function due to the class 4642/// having a particular non-static data member. 4643bool SpecialMemberDeletionInfo::shouldDeleteForField(FieldDecl *FD) { 4644 QualType FieldType = S.Context.getBaseElementType(FD->getType()); 4645 CXXRecordDecl *FieldRecord = FieldType->getAsCXXRecordDecl(); 4646 4647 if (CSM == Sema::CXXDefaultConstructor) { 4648 // For a default constructor, all references must be initialized in-class 4649 // and, if a union, it must have a non-const member. 4650 if (FieldType->isReferenceType() && !FD->hasInClassInitializer()) { 4651 if (Diagnose) 4652 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4653 << MD->getParent() << FD << FieldType << /*Reference*/0; 4654 return true; 4655 } 4656 // C++11 [class.ctor]p5: any non-variant non-static data member of 4657 // const-qualified type (or array thereof) with no 4658 // brace-or-equal-initializer does not have a user-provided default 4659 // constructor. 4660 if (!inUnion() && FieldType.isConstQualified() && 4661 !FD->hasInClassInitializer() && 4662 (!FieldRecord || !FieldRecord->hasUserProvidedDefaultConstructor())) { 4663 if (Diagnose) 4664 S.Diag(FD->getLocation(), diag::note_deleted_default_ctor_uninit_field) 4665 << MD->getParent() << FD << FD->getType() << /*Const*/1; 4666 return true; 4667 } 4668 4669 if (inUnion() && !FieldType.isConstQualified()) 4670 AllFieldsAreConst = false; 4671 } else if (CSM == Sema::CXXCopyConstructor) { 4672 // For a copy constructor, data members must not be of rvalue reference 4673 // type. 4674 if (FieldType->isRValueReferenceType()) { 4675 if (Diagnose) 4676 S.Diag(FD->getLocation(), diag::note_deleted_copy_ctor_rvalue_reference) 4677 << MD->getParent() << FD << FieldType; 4678 return true; 4679 } 4680 } else if (IsAssignment) { 4681 // For an assignment operator, data members must not be of reference type. 4682 if (FieldType->isReferenceType()) { 4683 if (Diagnose) 4684 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4685 << IsMove << MD->getParent() << FD << FieldType << /*Reference*/0; 4686 return true; 4687 } 4688 if (!FieldRecord && FieldType.isConstQualified()) { 4689 // C++11 [class.copy]p23: 4690 // -- a non-static data member of const non-class type (or array thereof) 4691 if (Diagnose) 4692 S.Diag(FD->getLocation(), diag::note_deleted_assign_field) 4693 << IsMove << MD->getParent() << FD << FD->getType() << /*Const*/1; 4694 return true; 4695 } 4696 } 4697 4698 if (FieldRecord) { 4699 // Some additional restrictions exist on the variant members. 4700 if (!inUnion() && FieldRecord->isUnion() && 4701 FieldRecord->isAnonymousStructOrUnion()) { 4702 bool AllVariantFieldsAreConst = true; 4703 4704 // FIXME: Handle anonymous unions declared within anonymous unions. 4705 for (CXXRecordDecl::field_iterator UI = FieldRecord->field_begin(), 4706 UE = FieldRecord->field_end(); 4707 UI != UE; ++UI) { 4708 QualType UnionFieldType = S.Context.getBaseElementType(UI->getType()); 4709 4710 if (!UnionFieldType.isConstQualified()) 4711 AllVariantFieldsAreConst = false; 4712 4713 CXXRecordDecl *UnionFieldRecord = UnionFieldType->getAsCXXRecordDecl(); 4714 if (UnionFieldRecord && 4715 shouldDeleteForClassSubobject(UnionFieldRecord, *UI, 4716 UnionFieldType.getCVRQualifiers())) 4717 return true; 4718 } 4719 4720 // At least one member in each anonymous union must be non-const 4721 if (CSM == Sema::CXXDefaultConstructor && AllVariantFieldsAreConst && 4722 FieldRecord->field_begin() != FieldRecord->field_end()) { 4723 if (Diagnose) 4724 S.Diag(FieldRecord->getLocation(), 4725 diag::note_deleted_default_ctor_all_const) 4726 << MD->getParent() << /*anonymous union*/1; 4727 return true; 4728 } 4729 4730 // Don't check the implicit member of the anonymous union type. 4731 // This is technically non-conformant, but sanity demands it. 4732 return false; 4733 } 4734 4735 if (shouldDeleteForClassSubobject(FieldRecord, FD, 4736 FieldType.getCVRQualifiers())) 4737 return true; 4738 } 4739 4740 return false; 4741} 4742 4743/// C++11 [class.ctor] p5: 4744/// A defaulted default constructor for a class X is defined as deleted if 4745/// X is a union and all of its variant members are of const-qualified type. 4746bool SpecialMemberDeletionInfo::shouldDeleteForAllConstMembers() { 4747 // This is a silly definition, because it gives an empty union a deleted 4748 // default constructor. Don't do that. 4749 if (CSM == Sema::CXXDefaultConstructor && inUnion() && AllFieldsAreConst && 4750 (MD->getParent()->field_begin() != MD->getParent()->field_end())) { 4751 if (Diagnose) 4752 S.Diag(MD->getParent()->getLocation(), 4753 diag::note_deleted_default_ctor_all_const) 4754 << MD->getParent() << /*not anonymous union*/0; 4755 return true; 4756 } 4757 return false; 4758} 4759 4760/// Determine whether a defaulted special member function should be defined as 4761/// deleted, as specified in C++11 [class.ctor]p5, C++11 [class.copy]p11, 4762/// C++11 [class.copy]p23, and C++11 [class.dtor]p5. 4763bool Sema::ShouldDeleteSpecialMember(CXXMethodDecl *MD, CXXSpecialMember CSM, 4764 bool Diagnose) { 4765 if (MD->isInvalidDecl()) 4766 return false; 4767 CXXRecordDecl *RD = MD->getParent(); 4768 assert(!RD->isDependentType() && "do deletion after instantiation"); 4769 if (!LangOpts.CPlusPlus11 || RD->isInvalidDecl()) 4770 return false; 4771 4772 // C++11 [expr.lambda.prim]p19: 4773 // The closure type associated with a lambda-expression has a 4774 // deleted (8.4.3) default constructor and a deleted copy 4775 // assignment operator. 4776 if (RD->isLambda() && 4777 (CSM == CXXDefaultConstructor || CSM == CXXCopyAssignment)) { 4778 if (Diagnose) 4779 Diag(RD->getLocation(), diag::note_lambda_decl); 4780 return true; 4781 } 4782 4783 // For an anonymous struct or union, the copy and assignment special members 4784 // will never be used, so skip the check. For an anonymous union declared at 4785 // namespace scope, the constructor and destructor are used. 4786 if (CSM != CXXDefaultConstructor && CSM != CXXDestructor && 4787 RD->isAnonymousStructOrUnion()) 4788 return false; 4789 4790 // C++11 [class.copy]p7, p18: 4791 // If the class definition declares a move constructor or move assignment 4792 // operator, an implicitly declared copy constructor or copy assignment 4793 // operator is defined as deleted. 4794 if (MD->isImplicit() && 4795 (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment)) { 4796 CXXMethodDecl *UserDeclaredMove = 0; 4797 4798 // In Microsoft mode, a user-declared move only causes the deletion of the 4799 // corresponding copy operation, not both copy operations. 4800 if (RD->hasUserDeclaredMoveConstructor() && 4801 (!getLangOpts().MicrosoftMode || CSM == CXXCopyConstructor)) { 4802 if (!Diagnose) return true; 4803 4804 // Find any user-declared move constructor. 4805 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4806 E = RD->ctor_end(); I != E; ++I) { 4807 if (I->isMoveConstructor()) { 4808 UserDeclaredMove = *I; 4809 break; 4810 } 4811 } 4812 assert(UserDeclaredMove); 4813 } else if (RD->hasUserDeclaredMoveAssignment() && 4814 (!getLangOpts().MicrosoftMode || CSM == CXXCopyAssignment)) { 4815 if (!Diagnose) return true; 4816 4817 // Find any user-declared move assignment operator. 4818 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 4819 E = RD->method_end(); I != E; ++I) { 4820 if (I->isMoveAssignmentOperator()) { 4821 UserDeclaredMove = *I; 4822 break; 4823 } 4824 } 4825 assert(UserDeclaredMove); 4826 } 4827 4828 if (UserDeclaredMove) { 4829 Diag(UserDeclaredMove->getLocation(), 4830 diag::note_deleted_copy_user_declared_move) 4831 << (CSM == CXXCopyAssignment) << RD 4832 << UserDeclaredMove->isMoveAssignmentOperator(); 4833 return true; 4834 } 4835 } 4836 4837 // Do access control from the special member function 4838 ContextRAII MethodContext(*this, MD); 4839 4840 // C++11 [class.dtor]p5: 4841 // -- for a virtual destructor, lookup of the non-array deallocation function 4842 // results in an ambiguity or in a function that is deleted or inaccessible 4843 if (CSM == CXXDestructor && MD->isVirtual()) { 4844 FunctionDecl *OperatorDelete = 0; 4845 DeclarationName Name = 4846 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 4847 if (FindDeallocationFunction(MD->getLocation(), MD->getParent(), Name, 4848 OperatorDelete, false)) { 4849 if (Diagnose) 4850 Diag(RD->getLocation(), diag::note_deleted_dtor_no_operator_delete); 4851 return true; 4852 } 4853 } 4854 4855 SpecialMemberDeletionInfo SMI(*this, MD, CSM, Diagnose); 4856 4857 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 4858 BE = RD->bases_end(); BI != BE; ++BI) 4859 if (!BI->isVirtual() && 4860 SMI.shouldDeleteForBase(BI)) 4861 return true; 4862 4863 for (CXXRecordDecl::base_class_iterator BI = RD->vbases_begin(), 4864 BE = RD->vbases_end(); BI != BE; ++BI) 4865 if (SMI.shouldDeleteForBase(BI)) 4866 return true; 4867 4868 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 4869 FE = RD->field_end(); FI != FE; ++FI) 4870 if (!FI->isInvalidDecl() && !FI->isUnnamedBitfield() && 4871 SMI.shouldDeleteForField(*FI)) 4872 return true; 4873 4874 if (SMI.shouldDeleteForAllConstMembers()) 4875 return true; 4876 4877 return false; 4878} 4879 4880/// Perform lookup for a special member of the specified kind, and determine 4881/// whether it is trivial. If the triviality can be determined without the 4882/// lookup, skip it. This is intended for use when determining whether a 4883/// special member of a containing object is trivial, and thus does not ever 4884/// perform overload resolution for default constructors. 4885/// 4886/// If \p Selected is not \c NULL, \c *Selected will be filled in with the 4887/// member that was most likely to be intended to be trivial, if any. 4888static bool findTrivialSpecialMember(Sema &S, CXXRecordDecl *RD, 4889 Sema::CXXSpecialMember CSM, unsigned Quals, 4890 CXXMethodDecl **Selected) { 4891 if (Selected) 4892 *Selected = 0; 4893 4894 switch (CSM) { 4895 case Sema::CXXInvalid: 4896 llvm_unreachable("not a special member"); 4897 4898 case Sema::CXXDefaultConstructor: 4899 // C++11 [class.ctor]p5: 4900 // A default constructor is trivial if: 4901 // - all the [direct subobjects] have trivial default constructors 4902 // 4903 // Note, no overload resolution is performed in this case. 4904 if (RD->hasTrivialDefaultConstructor()) 4905 return true; 4906 4907 if (Selected) { 4908 // If there's a default constructor which could have been trivial, dig it 4909 // out. Otherwise, if there's any user-provided default constructor, point 4910 // to that as an example of why there's not a trivial one. 4911 CXXConstructorDecl *DefCtor = 0; 4912 if (RD->needsImplicitDefaultConstructor()) 4913 S.DeclareImplicitDefaultConstructor(RD); 4914 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), 4915 CE = RD->ctor_end(); CI != CE; ++CI) { 4916 if (!CI->isDefaultConstructor()) 4917 continue; 4918 DefCtor = *CI; 4919 if (!DefCtor->isUserProvided()) 4920 break; 4921 } 4922 4923 *Selected = DefCtor; 4924 } 4925 4926 return false; 4927 4928 case Sema::CXXDestructor: 4929 // C++11 [class.dtor]p5: 4930 // A destructor is trivial if: 4931 // - all the direct [subobjects] have trivial destructors 4932 if (RD->hasTrivialDestructor()) 4933 return true; 4934 4935 if (Selected) { 4936 if (RD->needsImplicitDestructor()) 4937 S.DeclareImplicitDestructor(RD); 4938 *Selected = RD->getDestructor(); 4939 } 4940 4941 return false; 4942 4943 case Sema::CXXCopyConstructor: 4944 // C++11 [class.copy]p12: 4945 // A copy constructor is trivial if: 4946 // - the constructor selected to copy each direct [subobject] is trivial 4947 if (RD->hasTrivialCopyConstructor()) { 4948 if (Quals == Qualifiers::Const) 4949 // We must either select the trivial copy constructor or reach an 4950 // ambiguity; no need to actually perform overload resolution. 4951 return true; 4952 } else if (!Selected) { 4953 return false; 4954 } 4955 // In C++98, we are not supposed to perform overload resolution here, but we 4956 // treat that as a language defect, as suggested on cxx-abi-dev, to treat 4957 // cases like B as having a non-trivial copy constructor: 4958 // struct A { template<typename T> A(T&); }; 4959 // struct B { mutable A a; }; 4960 goto NeedOverloadResolution; 4961 4962 case Sema::CXXCopyAssignment: 4963 // C++11 [class.copy]p25: 4964 // A copy assignment operator is trivial if: 4965 // - the assignment operator selected to copy each direct [subobject] is 4966 // trivial 4967 if (RD->hasTrivialCopyAssignment()) { 4968 if (Quals == Qualifiers::Const) 4969 return true; 4970 } else if (!Selected) { 4971 return false; 4972 } 4973 // In C++98, we are not supposed to perform overload resolution here, but we 4974 // treat that as a language defect. 4975 goto NeedOverloadResolution; 4976 4977 case Sema::CXXMoveConstructor: 4978 case Sema::CXXMoveAssignment: 4979 NeedOverloadResolution: 4980 Sema::SpecialMemberOverloadResult *SMOR = 4981 S.LookupSpecialMember(RD, CSM, 4982 Quals & Qualifiers::Const, 4983 Quals & Qualifiers::Volatile, 4984 /*RValueThis*/false, /*ConstThis*/false, 4985 /*VolatileThis*/false); 4986 4987 // The standard doesn't describe how to behave if the lookup is ambiguous. 4988 // We treat it as not making the member non-trivial, just like the standard 4989 // mandates for the default constructor. This should rarely matter, because 4990 // the member will also be deleted. 4991 if (SMOR->getKind() == Sema::SpecialMemberOverloadResult::Ambiguous) 4992 return true; 4993 4994 if (!SMOR->getMethod()) { 4995 assert(SMOR->getKind() == 4996 Sema::SpecialMemberOverloadResult::NoMemberOrDeleted); 4997 return false; 4998 } 4999 5000 // We deliberately don't check if we found a deleted special member. We're 5001 // not supposed to! 5002 if (Selected) 5003 *Selected = SMOR->getMethod(); 5004 return SMOR->getMethod()->isTrivial(); 5005 } 5006 5007 llvm_unreachable("unknown special method kind"); 5008} 5009 5010static CXXConstructorDecl *findUserDeclaredCtor(CXXRecordDecl *RD) { 5011 for (CXXRecordDecl::ctor_iterator CI = RD->ctor_begin(), CE = RD->ctor_end(); 5012 CI != CE; ++CI) 5013 if (!CI->isImplicit()) 5014 return *CI; 5015 5016 // Look for constructor templates. 5017 typedef CXXRecordDecl::specific_decl_iterator<FunctionTemplateDecl> tmpl_iter; 5018 for (tmpl_iter TI(RD->decls_begin()), TE(RD->decls_end()); TI != TE; ++TI) { 5019 if (CXXConstructorDecl *CD = 5020 dyn_cast<CXXConstructorDecl>(TI->getTemplatedDecl())) 5021 return CD; 5022 } 5023 5024 return 0; 5025} 5026 5027/// The kind of subobject we are checking for triviality. The values of this 5028/// enumeration are used in diagnostics. 5029enum TrivialSubobjectKind { 5030 /// The subobject is a base class. 5031 TSK_BaseClass, 5032 /// The subobject is a non-static data member. 5033 TSK_Field, 5034 /// The object is actually the complete object. 5035 TSK_CompleteObject 5036}; 5037 5038/// Check whether the special member selected for a given type would be trivial. 5039static bool checkTrivialSubobjectCall(Sema &S, SourceLocation SubobjLoc, 5040 QualType SubType, 5041 Sema::CXXSpecialMember CSM, 5042 TrivialSubobjectKind Kind, 5043 bool Diagnose) { 5044 CXXRecordDecl *SubRD = SubType->getAsCXXRecordDecl(); 5045 if (!SubRD) 5046 return true; 5047 5048 CXXMethodDecl *Selected; 5049 if (findTrivialSpecialMember(S, SubRD, CSM, SubType.getCVRQualifiers(), 5050 Diagnose ? &Selected : 0)) 5051 return true; 5052 5053 if (Diagnose) { 5054 if (!Selected && CSM == Sema::CXXDefaultConstructor) { 5055 S.Diag(SubobjLoc, diag::note_nontrivial_no_def_ctor) 5056 << Kind << SubType.getUnqualifiedType(); 5057 if (CXXConstructorDecl *CD = findUserDeclaredCtor(SubRD)) 5058 S.Diag(CD->getLocation(), diag::note_user_declared_ctor); 5059 } else if (!Selected) 5060 S.Diag(SubobjLoc, diag::note_nontrivial_no_copy) 5061 << Kind << SubType.getUnqualifiedType() << CSM << SubType; 5062 else if (Selected->isUserProvided()) { 5063 if (Kind == TSK_CompleteObject) 5064 S.Diag(Selected->getLocation(), diag::note_nontrivial_user_provided) 5065 << Kind << SubType.getUnqualifiedType() << CSM; 5066 else { 5067 S.Diag(SubobjLoc, diag::note_nontrivial_user_provided) 5068 << Kind << SubType.getUnqualifiedType() << CSM; 5069 S.Diag(Selected->getLocation(), diag::note_declared_at); 5070 } 5071 } else { 5072 if (Kind != TSK_CompleteObject) 5073 S.Diag(SubobjLoc, diag::note_nontrivial_subobject) 5074 << Kind << SubType.getUnqualifiedType() << CSM; 5075 5076 // Explain why the defaulted or deleted special member isn't trivial. 5077 S.SpecialMemberIsTrivial(Selected, CSM, Diagnose); 5078 } 5079 } 5080 5081 return false; 5082} 5083 5084/// Check whether the members of a class type allow a special member to be 5085/// trivial. 5086static bool checkTrivialClassMembers(Sema &S, CXXRecordDecl *RD, 5087 Sema::CXXSpecialMember CSM, 5088 bool ConstArg, bool Diagnose) { 5089 for (CXXRecordDecl::field_iterator FI = RD->field_begin(), 5090 FE = RD->field_end(); FI != FE; ++FI) { 5091 if (FI->isInvalidDecl() || FI->isUnnamedBitfield()) 5092 continue; 5093 5094 QualType FieldType = S.Context.getBaseElementType(FI->getType()); 5095 5096 // Pretend anonymous struct or union members are members of this class. 5097 if (FI->isAnonymousStructOrUnion()) { 5098 if (!checkTrivialClassMembers(S, FieldType->getAsCXXRecordDecl(), 5099 CSM, ConstArg, Diagnose)) 5100 return false; 5101 continue; 5102 } 5103 5104 // C++11 [class.ctor]p5: 5105 // A default constructor is trivial if [...] 5106 // -- no non-static data member of its class has a 5107 // brace-or-equal-initializer 5108 if (CSM == Sema::CXXDefaultConstructor && FI->hasInClassInitializer()) { 5109 if (Diagnose) 5110 S.Diag(FI->getLocation(), diag::note_nontrivial_in_class_init) << *FI; 5111 return false; 5112 } 5113 5114 // Objective C ARC 4.3.5: 5115 // [...] nontrivally ownership-qualified types are [...] not trivially 5116 // default constructible, copy constructible, move constructible, copy 5117 // assignable, move assignable, or destructible [...] 5118 if (S.getLangOpts().ObjCAutoRefCount && 5119 FieldType.hasNonTrivialObjCLifetime()) { 5120 if (Diagnose) 5121 S.Diag(FI->getLocation(), diag::note_nontrivial_objc_ownership) 5122 << RD << FieldType.getObjCLifetime(); 5123 return false; 5124 } 5125 5126 if (ConstArg && !FI->isMutable()) 5127 FieldType.addConst(); 5128 if (!checkTrivialSubobjectCall(S, FI->getLocation(), FieldType, CSM, 5129 TSK_Field, Diagnose)) 5130 return false; 5131 } 5132 5133 return true; 5134} 5135 5136/// Diagnose why the specified class does not have a trivial special member of 5137/// the given kind. 5138void Sema::DiagnoseNontrivial(const CXXRecordDecl *RD, CXXSpecialMember CSM) { 5139 QualType Ty = Context.getRecordType(RD); 5140 if (CSM == CXXCopyConstructor || CSM == CXXCopyAssignment) 5141 Ty.addConst(); 5142 5143 checkTrivialSubobjectCall(*this, RD->getLocation(), Ty, CSM, 5144 TSK_CompleteObject, /*Diagnose*/true); 5145} 5146 5147/// Determine whether a defaulted or deleted special member function is trivial, 5148/// as specified in C++11 [class.ctor]p5, C++11 [class.copy]p12, 5149/// C++11 [class.copy]p25, and C++11 [class.dtor]p5. 5150bool Sema::SpecialMemberIsTrivial(CXXMethodDecl *MD, CXXSpecialMember CSM, 5151 bool Diagnose) { 5152 assert(!MD->isUserProvided() && CSM != CXXInvalid && "not special enough"); 5153 5154 CXXRecordDecl *RD = MD->getParent(); 5155 5156 bool ConstArg = false; 5157 5158 // C++11 [class.copy]p12, p25: 5159 // A [special member] is trivial if its declared parameter type is the same 5160 // as if it had been implicitly declared [...] 5161 switch (CSM) { 5162 case CXXDefaultConstructor: 5163 case CXXDestructor: 5164 // Trivial default constructors and destructors cannot have parameters. 5165 break; 5166 5167 case CXXCopyConstructor: 5168 case CXXCopyAssignment: { 5169 // Trivial copy operations always have const, non-volatile parameter types. 5170 ConstArg = true; 5171 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5172 const ReferenceType *RT = Param0->getType()->getAs<ReferenceType>(); 5173 if (!RT || RT->getPointeeType().getCVRQualifiers() != Qualifiers::Const) { 5174 if (Diagnose) 5175 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5176 << Param0->getSourceRange() << Param0->getType() 5177 << Context.getLValueReferenceType( 5178 Context.getRecordType(RD).withConst()); 5179 return false; 5180 } 5181 break; 5182 } 5183 5184 case CXXMoveConstructor: 5185 case CXXMoveAssignment: { 5186 // Trivial move operations always have non-cv-qualified parameters. 5187 const ParmVarDecl *Param0 = MD->getParamDecl(0); 5188 const RValueReferenceType *RT = 5189 Param0->getType()->getAs<RValueReferenceType>(); 5190 if (!RT || RT->getPointeeType().getCVRQualifiers()) { 5191 if (Diagnose) 5192 Diag(Param0->getLocation(), diag::note_nontrivial_param_type) 5193 << Param0->getSourceRange() << Param0->getType() 5194 << Context.getRValueReferenceType(Context.getRecordType(RD)); 5195 return false; 5196 } 5197 break; 5198 } 5199 5200 case CXXInvalid: 5201 llvm_unreachable("not a special member"); 5202 } 5203 5204 // FIXME: We require that the parameter-declaration-clause is equivalent to 5205 // that of an implicit declaration, not just that the declared parameter type 5206 // matches, in order to prevent absuridities like a function simultaneously 5207 // being a trivial copy constructor and a non-trivial default constructor. 5208 // This issue has not yet been assigned a core issue number. 5209 if (MD->getMinRequiredArguments() < MD->getNumParams()) { 5210 if (Diagnose) 5211 Diag(MD->getParamDecl(MD->getMinRequiredArguments())->getLocation(), 5212 diag::note_nontrivial_default_arg) 5213 << MD->getParamDecl(MD->getMinRequiredArguments())->getSourceRange(); 5214 return false; 5215 } 5216 if (MD->isVariadic()) { 5217 if (Diagnose) 5218 Diag(MD->getLocation(), diag::note_nontrivial_variadic); 5219 return false; 5220 } 5221 5222 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5223 // A copy/move [constructor or assignment operator] is trivial if 5224 // -- the [member] selected to copy/move each direct base class subobject 5225 // is trivial 5226 // 5227 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5228 // A [default constructor or destructor] is trivial if 5229 // -- all the direct base classes have trivial [default constructors or 5230 // destructors] 5231 for (CXXRecordDecl::base_class_iterator BI = RD->bases_begin(), 5232 BE = RD->bases_end(); BI != BE; ++BI) 5233 if (!checkTrivialSubobjectCall(*this, BI->getLocStart(), 5234 ConstArg ? BI->getType().withConst() 5235 : BI->getType(), 5236 CSM, TSK_BaseClass, Diagnose)) 5237 return false; 5238 5239 // C++11 [class.ctor]p5, C++11 [class.dtor]p5: 5240 // A copy/move [constructor or assignment operator] for a class X is 5241 // trivial if 5242 // -- for each non-static data member of X that is of class type (or array 5243 // thereof), the constructor selected to copy/move that member is 5244 // trivial 5245 // 5246 // C++11 [class.copy]p12, C++11 [class.copy]p25: 5247 // A [default constructor or destructor] is trivial if 5248 // -- for all of the non-static data members of its class that are of class 5249 // type (or array thereof), each such class has a trivial [default 5250 // constructor or destructor] 5251 if (!checkTrivialClassMembers(*this, RD, CSM, ConstArg, Diagnose)) 5252 return false; 5253 5254 // C++11 [class.dtor]p5: 5255 // A destructor is trivial if [...] 5256 // -- the destructor is not virtual 5257 if (CSM == CXXDestructor && MD->isVirtual()) { 5258 if (Diagnose) 5259 Diag(MD->getLocation(), diag::note_nontrivial_virtual_dtor) << RD; 5260 return false; 5261 } 5262 5263 // C++11 [class.ctor]p5, C++11 [class.copy]p12, C++11 [class.copy]p25: 5264 // A [special member] for class X is trivial if [...] 5265 // -- class X has no virtual functions and no virtual base classes 5266 if (CSM != CXXDestructor && MD->getParent()->isDynamicClass()) { 5267 if (!Diagnose) 5268 return false; 5269 5270 if (RD->getNumVBases()) { 5271 // Check for virtual bases. We already know that the corresponding 5272 // member in all bases is trivial, so vbases must all be direct. 5273 CXXBaseSpecifier &BS = *RD->vbases_begin(); 5274 assert(BS.isVirtual()); 5275 Diag(BS.getLocStart(), diag::note_nontrivial_has_virtual) << RD << 1; 5276 return false; 5277 } 5278 5279 // Must have a virtual method. 5280 for (CXXRecordDecl::method_iterator MI = RD->method_begin(), 5281 ME = RD->method_end(); MI != ME; ++MI) { 5282 if (MI->isVirtual()) { 5283 SourceLocation MLoc = MI->getLocStart(); 5284 Diag(MLoc, diag::note_nontrivial_has_virtual) << RD << 0; 5285 return false; 5286 } 5287 } 5288 5289 llvm_unreachable("dynamic class with no vbases and no virtual functions"); 5290 } 5291 5292 // Looks like it's trivial! 5293 return true; 5294} 5295 5296/// \brief Data used with FindHiddenVirtualMethod 5297namespace { 5298 struct FindHiddenVirtualMethodData { 5299 Sema *S; 5300 CXXMethodDecl *Method; 5301 llvm::SmallPtrSet<const CXXMethodDecl *, 8> OverridenAndUsingBaseMethods; 5302 SmallVector<CXXMethodDecl *, 8> OverloadedMethods; 5303 }; 5304} 5305 5306/// \brief Check whether any most overriden method from MD in Methods 5307static bool CheckMostOverridenMethods(const CXXMethodDecl *MD, 5308 const llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5309 if (MD->size_overridden_methods() == 0) 5310 return Methods.count(MD->getCanonicalDecl()); 5311 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5312 E = MD->end_overridden_methods(); 5313 I != E; ++I) 5314 if (CheckMostOverridenMethods(*I, Methods)) 5315 return true; 5316 return false; 5317} 5318 5319/// \brief Member lookup function that determines whether a given C++ 5320/// method overloads virtual methods in a base class without overriding any, 5321/// to be used with CXXRecordDecl::lookupInBases(). 5322static bool FindHiddenVirtualMethod(const CXXBaseSpecifier *Specifier, 5323 CXXBasePath &Path, 5324 void *UserData) { 5325 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 5326 5327 FindHiddenVirtualMethodData &Data 5328 = *static_cast<FindHiddenVirtualMethodData*>(UserData); 5329 5330 DeclarationName Name = Data.Method->getDeclName(); 5331 assert(Name.getNameKind() == DeclarationName::Identifier); 5332 5333 bool foundSameNameMethod = false; 5334 SmallVector<CXXMethodDecl *, 8> overloadedMethods; 5335 for (Path.Decls = BaseRecord->lookup(Name); 5336 !Path.Decls.empty(); 5337 Path.Decls = Path.Decls.slice(1)) { 5338 NamedDecl *D = Path.Decls.front(); 5339 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 5340 MD = MD->getCanonicalDecl(); 5341 foundSameNameMethod = true; 5342 // Interested only in hidden virtual methods. 5343 if (!MD->isVirtual()) 5344 continue; 5345 // If the method we are checking overrides a method from its base 5346 // don't warn about the other overloaded methods. 5347 if (!Data.S->IsOverload(Data.Method, MD, false)) 5348 return true; 5349 // Collect the overload only if its hidden. 5350 if (!CheckMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods)) 5351 overloadedMethods.push_back(MD); 5352 } 5353 } 5354 5355 if (foundSameNameMethod) 5356 Data.OverloadedMethods.append(overloadedMethods.begin(), 5357 overloadedMethods.end()); 5358 return foundSameNameMethod; 5359} 5360 5361/// \brief Add the most overriden methods from MD to Methods 5362static void AddMostOverridenMethods(const CXXMethodDecl *MD, 5363 llvm::SmallPtrSet<const CXXMethodDecl *, 8>& Methods) { 5364 if (MD->size_overridden_methods() == 0) 5365 Methods.insert(MD->getCanonicalDecl()); 5366 for (CXXMethodDecl::method_iterator I = MD->begin_overridden_methods(), 5367 E = MD->end_overridden_methods(); 5368 I != E; ++I) 5369 AddMostOverridenMethods(*I, Methods); 5370} 5371 5372/// \brief See if a method overloads virtual methods in a base class without 5373/// overriding any. 5374void Sema::DiagnoseHiddenVirtualMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 5375 if (Diags.getDiagnosticLevel(diag::warn_overloaded_virtual, 5376 MD->getLocation()) == DiagnosticsEngine::Ignored) 5377 return; 5378 if (!MD->getDeclName().isIdentifier()) 5379 return; 5380 5381 CXXBasePaths Paths(/*FindAmbiguities=*/true, // true to look in all bases. 5382 /*bool RecordPaths=*/false, 5383 /*bool DetectVirtual=*/false); 5384 FindHiddenVirtualMethodData Data; 5385 Data.Method = MD; 5386 Data.S = this; 5387 5388 // Keep the base methods that were overriden or introduced in the subclass 5389 // by 'using' in a set. A base method not in this set is hidden. 5390 DeclContext::lookup_result R = DC->lookup(MD->getDeclName()); 5391 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; ++I) { 5392 NamedDecl *ND = *I; 5393 if (UsingShadowDecl *shad = dyn_cast<UsingShadowDecl>(*I)) 5394 ND = shad->getTargetDecl(); 5395 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(ND)) 5396 AddMostOverridenMethods(MD, Data.OverridenAndUsingBaseMethods); 5397 } 5398 5399 if (DC->lookupInBases(&FindHiddenVirtualMethod, &Data, Paths) && 5400 !Data.OverloadedMethods.empty()) { 5401 Diag(MD->getLocation(), diag::warn_overloaded_virtual) 5402 << MD << (Data.OverloadedMethods.size() > 1); 5403 5404 for (unsigned i = 0, e = Data.OverloadedMethods.size(); i != e; ++i) { 5405 CXXMethodDecl *overloadedMD = Data.OverloadedMethods[i]; 5406 Diag(overloadedMD->getLocation(), 5407 diag::note_hidden_overloaded_virtual_declared_here) << overloadedMD; 5408 } 5409 } 5410} 5411 5412void Sema::ActOnFinishCXXMemberSpecification(Scope* S, SourceLocation RLoc, 5413 Decl *TagDecl, 5414 SourceLocation LBrac, 5415 SourceLocation RBrac, 5416 AttributeList *AttrList) { 5417 if (!TagDecl) 5418 return; 5419 5420 AdjustDeclIfTemplate(TagDecl); 5421 5422 for (const AttributeList* l = AttrList; l; l = l->getNext()) { 5423 if (l->getKind() != AttributeList::AT_Visibility) 5424 continue; 5425 l->setInvalid(); 5426 Diag(l->getLoc(), diag::warn_attribute_after_definition_ignored) << 5427 l->getName(); 5428 } 5429 5430 ActOnFields(S, RLoc, TagDecl, llvm::makeArrayRef( 5431 // strict aliasing violation! 5432 reinterpret_cast<Decl**>(FieldCollector->getCurFields()), 5433 FieldCollector->getCurNumFields()), LBrac, RBrac, AttrList); 5434 5435 CheckCompletedCXXClass( 5436 dyn_cast_or_null<CXXRecordDecl>(TagDecl)); 5437} 5438 5439/// AddImplicitlyDeclaredMembersToClass - Adds any implicitly-declared 5440/// special functions, such as the default constructor, copy 5441/// constructor, or destructor, to the given C++ class (C++ 5442/// [special]p1). This routine can only be executed just before the 5443/// definition of the class is complete. 5444void Sema::AddImplicitlyDeclaredMembersToClass(CXXRecordDecl *ClassDecl) { 5445 if (!ClassDecl->hasUserDeclaredConstructor()) 5446 ++ASTContext::NumImplicitDefaultConstructors; 5447 5448 if (!ClassDecl->hasUserDeclaredCopyConstructor()) { 5449 ++ASTContext::NumImplicitCopyConstructors; 5450 5451 // If the properties or semantics of the copy constructor couldn't be 5452 // determined while the class was being declared, force a declaration 5453 // of it now. 5454 if (ClassDecl->needsOverloadResolutionForCopyConstructor()) 5455 DeclareImplicitCopyConstructor(ClassDecl); 5456 } 5457 5458 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveConstructor()) { 5459 ++ASTContext::NumImplicitMoveConstructors; 5460 5461 if (ClassDecl->needsOverloadResolutionForMoveConstructor()) 5462 DeclareImplicitMoveConstructor(ClassDecl); 5463 } 5464 5465 if (!ClassDecl->hasUserDeclaredCopyAssignment()) { 5466 ++ASTContext::NumImplicitCopyAssignmentOperators; 5467 5468 // If we have a dynamic class, then the copy assignment operator may be 5469 // virtual, so we have to declare it immediately. This ensures that, e.g., 5470 // it shows up in the right place in the vtable and that we diagnose 5471 // problems with the implicit exception specification. 5472 if (ClassDecl->isDynamicClass() || 5473 ClassDecl->needsOverloadResolutionForCopyAssignment()) 5474 DeclareImplicitCopyAssignment(ClassDecl); 5475 } 5476 5477 if (getLangOpts().CPlusPlus11 && ClassDecl->needsImplicitMoveAssignment()) { 5478 ++ASTContext::NumImplicitMoveAssignmentOperators; 5479 5480 // Likewise for the move assignment operator. 5481 if (ClassDecl->isDynamicClass() || 5482 ClassDecl->needsOverloadResolutionForMoveAssignment()) 5483 DeclareImplicitMoveAssignment(ClassDecl); 5484 } 5485 5486 if (!ClassDecl->hasUserDeclaredDestructor()) { 5487 ++ASTContext::NumImplicitDestructors; 5488 5489 // If we have a dynamic class, then the destructor may be virtual, so we 5490 // have to declare the destructor immediately. This ensures that, e.g., it 5491 // shows up in the right place in the vtable and that we diagnose problems 5492 // with the implicit exception specification. 5493 if (ClassDecl->isDynamicClass() || 5494 ClassDecl->needsOverloadResolutionForDestructor()) 5495 DeclareImplicitDestructor(ClassDecl); 5496 } 5497} 5498 5499void Sema::ActOnReenterDeclaratorTemplateScope(Scope *S, DeclaratorDecl *D) { 5500 if (!D) 5501 return; 5502 5503 int NumParamList = D->getNumTemplateParameterLists(); 5504 for (int i = 0; i < NumParamList; i++) { 5505 TemplateParameterList* Params = D->getTemplateParameterList(i); 5506 for (TemplateParameterList::iterator Param = Params->begin(), 5507 ParamEnd = Params->end(); 5508 Param != ParamEnd; ++Param) { 5509 NamedDecl *Named = cast<NamedDecl>(*Param); 5510 if (Named->getDeclName()) { 5511 S->AddDecl(Named); 5512 IdResolver.AddDecl(Named); 5513 } 5514 } 5515 } 5516} 5517 5518void Sema::ActOnReenterTemplateScope(Scope *S, Decl *D) { 5519 if (!D) 5520 return; 5521 5522 TemplateParameterList *Params = 0; 5523 if (TemplateDecl *Template = dyn_cast<TemplateDecl>(D)) 5524 Params = Template->getTemplateParameters(); 5525 else if (ClassTemplatePartialSpecializationDecl *PartialSpec 5526 = dyn_cast<ClassTemplatePartialSpecializationDecl>(D)) 5527 Params = PartialSpec->getTemplateParameters(); 5528 else 5529 return; 5530 5531 for (TemplateParameterList::iterator Param = Params->begin(), 5532 ParamEnd = Params->end(); 5533 Param != ParamEnd; ++Param) { 5534 NamedDecl *Named = cast<NamedDecl>(*Param); 5535 if (Named->getDeclName()) { 5536 S->AddDecl(Named); 5537 IdResolver.AddDecl(Named); 5538 } 5539 } 5540} 5541 5542void Sema::ActOnStartDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5543 if (!RecordD) return; 5544 AdjustDeclIfTemplate(RecordD); 5545 CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordD); 5546 PushDeclContext(S, Record); 5547} 5548 5549void Sema::ActOnFinishDelayedMemberDeclarations(Scope *S, Decl *RecordD) { 5550 if (!RecordD) return; 5551 PopDeclContext(); 5552} 5553 5554/// ActOnStartDelayedCXXMethodDeclaration - We have completed 5555/// parsing a top-level (non-nested) C++ class, and we are now 5556/// parsing those parts of the given Method declaration that could 5557/// not be parsed earlier (C++ [class.mem]p2), such as default 5558/// arguments. This action should enter the scope of the given 5559/// Method declaration as if we had just parsed the qualified method 5560/// name. However, it should not bring the parameters into scope; 5561/// that will be performed by ActOnDelayedCXXMethodParameter. 5562void Sema::ActOnStartDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5563} 5564 5565/// ActOnDelayedCXXMethodParameter - We've already started a delayed 5566/// C++ method declaration. We're (re-)introducing the given 5567/// function parameter into scope for use in parsing later parts of 5568/// the method declaration. For example, we could see an 5569/// ActOnParamDefaultArgument event for this parameter. 5570void Sema::ActOnDelayedCXXMethodParameter(Scope *S, Decl *ParamD) { 5571 if (!ParamD) 5572 return; 5573 5574 ParmVarDecl *Param = cast<ParmVarDecl>(ParamD); 5575 5576 // If this parameter has an unparsed default argument, clear it out 5577 // to make way for the parsed default argument. 5578 if (Param->hasUnparsedDefaultArg()) 5579 Param->setDefaultArg(0); 5580 5581 S->AddDecl(Param); 5582 if (Param->getDeclName()) 5583 IdResolver.AddDecl(Param); 5584} 5585 5586/// ActOnFinishDelayedCXXMethodDeclaration - We have finished 5587/// processing the delayed method declaration for Method. The method 5588/// declaration is now considered finished. There may be a separate 5589/// ActOnStartOfFunctionDef action later (not necessarily 5590/// immediately!) for this method, if it was also defined inside the 5591/// class body. 5592void Sema::ActOnFinishDelayedCXXMethodDeclaration(Scope *S, Decl *MethodD) { 5593 if (!MethodD) 5594 return; 5595 5596 AdjustDeclIfTemplate(MethodD); 5597 5598 FunctionDecl *Method = cast<FunctionDecl>(MethodD); 5599 5600 // Now that we have our default arguments, check the constructor 5601 // again. It could produce additional diagnostics or affect whether 5602 // the class has implicitly-declared destructors, among other 5603 // things. 5604 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(Method)) 5605 CheckConstructor(Constructor); 5606 5607 // Check the default arguments, which we may have added. 5608 if (!Method->isInvalidDecl()) 5609 CheckCXXDefaultArguments(Method); 5610} 5611 5612/// CheckConstructorDeclarator - Called by ActOnDeclarator to check 5613/// the well-formedness of the constructor declarator @p D with type @p 5614/// R. If there are any errors in the declarator, this routine will 5615/// emit diagnostics and set the invalid bit to true. In any case, the type 5616/// will be updated to reflect a well-formed type for the constructor and 5617/// returned. 5618QualType Sema::CheckConstructorDeclarator(Declarator &D, QualType R, 5619 StorageClass &SC) { 5620 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 5621 5622 // C++ [class.ctor]p3: 5623 // A constructor shall not be virtual (10.3) or static (9.4). A 5624 // constructor can be invoked for a const, volatile or const 5625 // volatile object. A constructor shall not be declared const, 5626 // volatile, or const volatile (9.3.2). 5627 if (isVirtual) { 5628 if (!D.isInvalidType()) 5629 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5630 << "virtual" << SourceRange(D.getDeclSpec().getVirtualSpecLoc()) 5631 << SourceRange(D.getIdentifierLoc()); 5632 D.setInvalidType(); 5633 } 5634 if (SC == SC_Static) { 5635 if (!D.isInvalidType()) 5636 Diag(D.getIdentifierLoc(), diag::err_constructor_cannot_be) 5637 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5638 << SourceRange(D.getIdentifierLoc()); 5639 D.setInvalidType(); 5640 SC = SC_None; 5641 } 5642 5643 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5644 if (FTI.TypeQuals != 0) { 5645 if (FTI.TypeQuals & Qualifiers::Const) 5646 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5647 << "const" << SourceRange(D.getIdentifierLoc()); 5648 if (FTI.TypeQuals & Qualifiers::Volatile) 5649 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5650 << "volatile" << SourceRange(D.getIdentifierLoc()); 5651 if (FTI.TypeQuals & Qualifiers::Restrict) 5652 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_constructor) 5653 << "restrict" << SourceRange(D.getIdentifierLoc()); 5654 D.setInvalidType(); 5655 } 5656 5657 // C++0x [class.ctor]p4: 5658 // A constructor shall not be declared with a ref-qualifier. 5659 if (FTI.hasRefQualifier()) { 5660 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_constructor) 5661 << FTI.RefQualifierIsLValueRef 5662 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5663 D.setInvalidType(); 5664 } 5665 5666 // Rebuild the function type "R" without any type qualifiers (in 5667 // case any of the errors above fired) and with "void" as the 5668 // return type, since constructors don't have return types. 5669 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5670 if (Proto->getResultType() == Context.VoidTy && !D.isInvalidType()) 5671 return R; 5672 5673 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5674 EPI.TypeQuals = 0; 5675 EPI.RefQualifier = RQ_None; 5676 5677 return Context.getFunctionType(Context.VoidTy, Proto->getArgTypes(), EPI); 5678} 5679 5680/// CheckConstructor - Checks a fully-formed constructor for 5681/// well-formedness, issuing any diagnostics required. Returns true if 5682/// the constructor declarator is invalid. 5683void Sema::CheckConstructor(CXXConstructorDecl *Constructor) { 5684 CXXRecordDecl *ClassDecl 5685 = dyn_cast<CXXRecordDecl>(Constructor->getDeclContext()); 5686 if (!ClassDecl) 5687 return Constructor->setInvalidDecl(); 5688 5689 // C++ [class.copy]p3: 5690 // A declaration of a constructor for a class X is ill-formed if 5691 // its first parameter is of type (optionally cv-qualified) X and 5692 // either there are no other parameters or else all other 5693 // parameters have default arguments. 5694 if (!Constructor->isInvalidDecl() && 5695 ((Constructor->getNumParams() == 1) || 5696 (Constructor->getNumParams() > 1 && 5697 Constructor->getParamDecl(1)->hasDefaultArg())) && 5698 Constructor->getTemplateSpecializationKind() 5699 != TSK_ImplicitInstantiation) { 5700 QualType ParamType = Constructor->getParamDecl(0)->getType(); 5701 QualType ClassTy = Context.getTagDeclType(ClassDecl); 5702 if (Context.getCanonicalType(ParamType).getUnqualifiedType() == ClassTy) { 5703 SourceLocation ParamLoc = Constructor->getParamDecl(0)->getLocation(); 5704 const char *ConstRef 5705 = Constructor->getParamDecl(0)->getIdentifier() ? "const &" 5706 : " const &"; 5707 Diag(ParamLoc, diag::err_constructor_byvalue_arg) 5708 << FixItHint::CreateInsertion(ParamLoc, ConstRef); 5709 5710 // FIXME: Rather that making the constructor invalid, we should endeavor 5711 // to fix the type. 5712 Constructor->setInvalidDecl(); 5713 } 5714 } 5715} 5716 5717/// CheckDestructor - Checks a fully-formed destructor definition for 5718/// well-formedness, issuing any diagnostics required. Returns true 5719/// on error. 5720bool Sema::CheckDestructor(CXXDestructorDecl *Destructor) { 5721 CXXRecordDecl *RD = Destructor->getParent(); 5722 5723 if (Destructor->isVirtual()) { 5724 SourceLocation Loc; 5725 5726 if (!Destructor->isImplicit()) 5727 Loc = Destructor->getLocation(); 5728 else 5729 Loc = RD->getLocation(); 5730 5731 // If we have a virtual destructor, look up the deallocation function 5732 FunctionDecl *OperatorDelete = 0; 5733 DeclarationName Name = 5734 Context.DeclarationNames.getCXXOperatorName(OO_Delete); 5735 if (FindDeallocationFunction(Loc, RD, Name, OperatorDelete)) 5736 return true; 5737 5738 MarkFunctionReferenced(Loc, OperatorDelete); 5739 5740 Destructor->setOperatorDelete(OperatorDelete); 5741 } 5742 5743 return false; 5744} 5745 5746static inline bool 5747FTIHasSingleVoidArgument(DeclaratorChunk::FunctionTypeInfo &FTI) { 5748 return (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5749 FTI.ArgInfo[0].Param && 5750 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()); 5751} 5752 5753/// CheckDestructorDeclarator - Called by ActOnDeclarator to check 5754/// the well-formednes of the destructor declarator @p D with type @p 5755/// R. If there are any errors in the declarator, this routine will 5756/// emit diagnostics and set the declarator to invalid. Even if this happens, 5757/// will be updated to reflect a well-formed type for the destructor and 5758/// returned. 5759QualType Sema::CheckDestructorDeclarator(Declarator &D, QualType R, 5760 StorageClass& SC) { 5761 // C++ [class.dtor]p1: 5762 // [...] A typedef-name that names a class is a class-name 5763 // (7.1.3); however, a typedef-name that names a class shall not 5764 // be used as the identifier in the declarator for a destructor 5765 // declaration. 5766 QualType DeclaratorType = GetTypeFromParser(D.getName().DestructorName); 5767 if (const TypedefType *TT = DeclaratorType->getAs<TypedefType>()) 5768 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5769 << DeclaratorType << isa<TypeAliasDecl>(TT->getDecl()); 5770 else if (const TemplateSpecializationType *TST = 5771 DeclaratorType->getAs<TemplateSpecializationType>()) 5772 if (TST->isTypeAlias()) 5773 Diag(D.getIdentifierLoc(), diag::err_destructor_typedef_name) 5774 << DeclaratorType << 1; 5775 5776 // C++ [class.dtor]p2: 5777 // A destructor is used to destroy objects of its class type. A 5778 // destructor takes no parameters, and no return type can be 5779 // specified for it (not even void). The address of a destructor 5780 // shall not be taken. A destructor shall not be static. A 5781 // destructor can be invoked for a const, volatile or const 5782 // volatile object. A destructor shall not be declared const, 5783 // volatile or const volatile (9.3.2). 5784 if (SC == SC_Static) { 5785 if (!D.isInvalidType()) 5786 Diag(D.getIdentifierLoc(), diag::err_destructor_cannot_be) 5787 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5788 << SourceRange(D.getIdentifierLoc()) 5789 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5790 5791 SC = SC_None; 5792 } 5793 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5794 // Destructors don't have return types, but the parser will 5795 // happily parse something like: 5796 // 5797 // class X { 5798 // float ~X(); 5799 // }; 5800 // 5801 // The return type will be eliminated later. 5802 Diag(D.getIdentifierLoc(), diag::err_destructor_return_type) 5803 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5804 << SourceRange(D.getIdentifierLoc()); 5805 } 5806 5807 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5808 if (FTI.TypeQuals != 0 && !D.isInvalidType()) { 5809 if (FTI.TypeQuals & Qualifiers::Const) 5810 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5811 << "const" << SourceRange(D.getIdentifierLoc()); 5812 if (FTI.TypeQuals & Qualifiers::Volatile) 5813 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5814 << "volatile" << SourceRange(D.getIdentifierLoc()); 5815 if (FTI.TypeQuals & Qualifiers::Restrict) 5816 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_destructor) 5817 << "restrict" << SourceRange(D.getIdentifierLoc()); 5818 D.setInvalidType(); 5819 } 5820 5821 // C++0x [class.dtor]p2: 5822 // A destructor shall not be declared with a ref-qualifier. 5823 if (FTI.hasRefQualifier()) { 5824 Diag(FTI.getRefQualifierLoc(), diag::err_ref_qualifier_destructor) 5825 << FTI.RefQualifierIsLValueRef 5826 << FixItHint::CreateRemoval(FTI.getRefQualifierLoc()); 5827 D.setInvalidType(); 5828 } 5829 5830 // Make sure we don't have any parameters. 5831 if (FTI.NumArgs > 0 && !FTIHasSingleVoidArgument(FTI)) { 5832 Diag(D.getIdentifierLoc(), diag::err_destructor_with_params); 5833 5834 // Delete the parameters. 5835 FTI.freeArgs(); 5836 D.setInvalidType(); 5837 } 5838 5839 // Make sure the destructor isn't variadic. 5840 if (FTI.isVariadic) { 5841 Diag(D.getIdentifierLoc(), diag::err_destructor_variadic); 5842 D.setInvalidType(); 5843 } 5844 5845 // Rebuild the function type "R" without any type qualifiers or 5846 // parameters (in case any of the errors above fired) and with 5847 // "void" as the return type, since destructors don't have return 5848 // types. 5849 if (!D.isInvalidType()) 5850 return R; 5851 5852 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5853 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo(); 5854 EPI.Variadic = false; 5855 EPI.TypeQuals = 0; 5856 EPI.RefQualifier = RQ_None; 5857 return Context.getFunctionType(Context.VoidTy, ArrayRef<QualType>(), EPI); 5858} 5859 5860/// CheckConversionDeclarator - Called by ActOnDeclarator to check the 5861/// well-formednes of the conversion function declarator @p D with 5862/// type @p R. If there are any errors in the declarator, this routine 5863/// will emit diagnostics and return true. Otherwise, it will return 5864/// false. Either way, the type @p R will be updated to reflect a 5865/// well-formed type for the conversion operator. 5866void Sema::CheckConversionDeclarator(Declarator &D, QualType &R, 5867 StorageClass& SC) { 5868 // C++ [class.conv.fct]p1: 5869 // Neither parameter types nor return type can be specified. The 5870 // type of a conversion function (8.3.5) is "function taking no 5871 // parameter returning conversion-type-id." 5872 if (SC == SC_Static) { 5873 if (!D.isInvalidType()) 5874 Diag(D.getIdentifierLoc(), diag::err_conv_function_not_member) 5875 << "static" << SourceRange(D.getDeclSpec().getStorageClassSpecLoc()) 5876 << SourceRange(D.getIdentifierLoc()); 5877 D.setInvalidType(); 5878 SC = SC_None; 5879 } 5880 5881 QualType ConvType = GetTypeFromParser(D.getName().ConversionFunctionId); 5882 5883 if (D.getDeclSpec().hasTypeSpecifier() && !D.isInvalidType()) { 5884 // Conversion functions don't have return types, but the parser will 5885 // happily parse something like: 5886 // 5887 // class X { 5888 // float operator bool(); 5889 // }; 5890 // 5891 // The return type will be changed later anyway. 5892 Diag(D.getIdentifierLoc(), diag::err_conv_function_return_type) 5893 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 5894 << SourceRange(D.getIdentifierLoc()); 5895 D.setInvalidType(); 5896 } 5897 5898 const FunctionProtoType *Proto = R->getAs<FunctionProtoType>(); 5899 5900 // Make sure we don't have any parameters. 5901 if (Proto->getNumArgs() > 0) { 5902 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_params); 5903 5904 // Delete the parameters. 5905 D.getFunctionTypeInfo().freeArgs(); 5906 D.setInvalidType(); 5907 } else if (Proto->isVariadic()) { 5908 Diag(D.getIdentifierLoc(), diag::err_conv_function_variadic); 5909 D.setInvalidType(); 5910 } 5911 5912 // Diagnose "&operator bool()" and other such nonsense. This 5913 // is actually a gcc extension which we don't support. 5914 if (Proto->getResultType() != ConvType) { 5915 Diag(D.getIdentifierLoc(), diag::err_conv_function_with_complex_decl) 5916 << Proto->getResultType(); 5917 D.setInvalidType(); 5918 ConvType = Proto->getResultType(); 5919 } 5920 5921 // C++ [class.conv.fct]p4: 5922 // The conversion-type-id shall not represent a function type nor 5923 // an array type. 5924 if (ConvType->isArrayType()) { 5925 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_array); 5926 ConvType = Context.getPointerType(ConvType); 5927 D.setInvalidType(); 5928 } else if (ConvType->isFunctionType()) { 5929 Diag(D.getIdentifierLoc(), diag::err_conv_function_to_function); 5930 ConvType = Context.getPointerType(ConvType); 5931 D.setInvalidType(); 5932 } 5933 5934 // Rebuild the function type "R" without any parameters (in case any 5935 // of the errors above fired) and with the conversion type as the 5936 // return type. 5937 if (D.isInvalidType()) 5938 R = Context.getFunctionType(ConvType, ArrayRef<QualType>(), 5939 Proto->getExtProtoInfo()); 5940 5941 // C++0x explicit conversion operators. 5942 if (D.getDeclSpec().isExplicitSpecified()) 5943 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5944 getLangOpts().CPlusPlus11 ? 5945 diag::warn_cxx98_compat_explicit_conversion_functions : 5946 diag::ext_explicit_conversion_functions) 5947 << SourceRange(D.getDeclSpec().getExplicitSpecLoc()); 5948} 5949 5950/// ActOnConversionDeclarator - Called by ActOnDeclarator to complete 5951/// the declaration of the given C++ conversion function. This routine 5952/// is responsible for recording the conversion function in the C++ 5953/// class, if possible. 5954Decl *Sema::ActOnConversionDeclarator(CXXConversionDecl *Conversion) { 5955 assert(Conversion && "Expected to receive a conversion function declaration"); 5956 5957 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Conversion->getDeclContext()); 5958 5959 // Make sure we aren't redeclaring the conversion function. 5960 QualType ConvType = Context.getCanonicalType(Conversion->getConversionType()); 5961 5962 // C++ [class.conv.fct]p1: 5963 // [...] A conversion function is never used to convert a 5964 // (possibly cv-qualified) object to the (possibly cv-qualified) 5965 // same object type (or a reference to it), to a (possibly 5966 // cv-qualified) base class of that type (or a reference to it), 5967 // or to (possibly cv-qualified) void. 5968 // FIXME: Suppress this warning if the conversion function ends up being a 5969 // virtual function that overrides a virtual function in a base class. 5970 QualType ClassType 5971 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 5972 if (const ReferenceType *ConvTypeRef = ConvType->getAs<ReferenceType>()) 5973 ConvType = ConvTypeRef->getPointeeType(); 5974 if (Conversion->getTemplateSpecializationKind() != TSK_Undeclared && 5975 Conversion->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5976 /* Suppress diagnostics for instantiations. */; 5977 else if (ConvType->isRecordType()) { 5978 ConvType = Context.getCanonicalType(ConvType).getUnqualifiedType(); 5979 if (ConvType == ClassType) 5980 Diag(Conversion->getLocation(), diag::warn_conv_to_self_not_used) 5981 << ClassType; 5982 else if (IsDerivedFrom(ClassType, ConvType)) 5983 Diag(Conversion->getLocation(), diag::warn_conv_to_base_not_used) 5984 << ClassType << ConvType; 5985 } else if (ConvType->isVoidType()) { 5986 Diag(Conversion->getLocation(), diag::warn_conv_to_void_not_used) 5987 << ClassType << ConvType; 5988 } 5989 5990 if (FunctionTemplateDecl *ConversionTemplate 5991 = Conversion->getDescribedFunctionTemplate()) 5992 return ConversionTemplate; 5993 5994 return Conversion; 5995} 5996 5997//===----------------------------------------------------------------------===// 5998// Namespace Handling 5999//===----------------------------------------------------------------------===// 6000 6001/// \brief Diagnose a mismatch in 'inline' qualifiers when a namespace is 6002/// reopened. 6003static void DiagnoseNamespaceInlineMismatch(Sema &S, SourceLocation KeywordLoc, 6004 SourceLocation Loc, 6005 IdentifierInfo *II, bool *IsInline, 6006 NamespaceDecl *PrevNS) { 6007 assert(*IsInline != PrevNS->isInline()); 6008 6009 // HACK: Work around a bug in libstdc++4.6's <atomic>, where 6010 // std::__atomic[0,1,2] are defined as non-inline namespaces, then reopened as 6011 // inline namespaces, with the intention of bringing names into namespace std. 6012 // 6013 // We support this just well enough to get that case working; this is not 6014 // sufficient to support reopening namespaces as inline in general. 6015 if (*IsInline && II && II->getName().startswith("__atomic") && 6016 S.getSourceManager().isInSystemHeader(Loc)) { 6017 // Mark all prior declarations of the namespace as inline. 6018 for (NamespaceDecl *NS = PrevNS->getMostRecentDecl(); NS; 6019 NS = NS->getPreviousDecl()) 6020 NS->setInline(*IsInline); 6021 // Patch up the lookup table for the containing namespace. This isn't really 6022 // correct, but it's good enough for this particular case. 6023 for (DeclContext::decl_iterator I = PrevNS->decls_begin(), 6024 E = PrevNS->decls_end(); I != E; ++I) 6025 if (NamedDecl *ND = dyn_cast<NamedDecl>(*I)) 6026 PrevNS->getParent()->makeDeclVisibleInContext(ND); 6027 return; 6028 } 6029 6030 if (PrevNS->isInline()) 6031 // The user probably just forgot the 'inline', so suggest that it 6032 // be added back. 6033 S.Diag(Loc, diag::warn_inline_namespace_reopened_noninline) 6034 << FixItHint::CreateInsertion(KeywordLoc, "inline "); 6035 else 6036 S.Diag(Loc, diag::err_inline_namespace_mismatch) 6037 << IsInline; 6038 6039 S.Diag(PrevNS->getLocation(), diag::note_previous_definition); 6040 *IsInline = PrevNS->isInline(); 6041} 6042 6043/// ActOnStartNamespaceDef - This is called at the start of a namespace 6044/// definition. 6045Decl *Sema::ActOnStartNamespaceDef(Scope *NamespcScope, 6046 SourceLocation InlineLoc, 6047 SourceLocation NamespaceLoc, 6048 SourceLocation IdentLoc, 6049 IdentifierInfo *II, 6050 SourceLocation LBrace, 6051 AttributeList *AttrList) { 6052 SourceLocation StartLoc = InlineLoc.isValid() ? InlineLoc : NamespaceLoc; 6053 // For anonymous namespace, take the location of the left brace. 6054 SourceLocation Loc = II ? IdentLoc : LBrace; 6055 bool IsInline = InlineLoc.isValid(); 6056 bool IsInvalid = false; 6057 bool IsStd = false; 6058 bool AddToKnown = false; 6059 Scope *DeclRegionScope = NamespcScope->getParent(); 6060 6061 NamespaceDecl *PrevNS = 0; 6062 if (II) { 6063 // C++ [namespace.def]p2: 6064 // The identifier in an original-namespace-definition shall not 6065 // have been previously defined in the declarative region in 6066 // which the original-namespace-definition appears. The 6067 // identifier in an original-namespace-definition is the name of 6068 // the namespace. Subsequently in that declarative region, it is 6069 // treated as an original-namespace-name. 6070 // 6071 // Since namespace names are unique in their scope, and we don't 6072 // look through using directives, just look for any ordinary names. 6073 6074 const unsigned IDNS = Decl::IDNS_Ordinary | Decl::IDNS_Member | 6075 Decl::IDNS_Type | Decl::IDNS_Using | Decl::IDNS_Tag | 6076 Decl::IDNS_Namespace; 6077 NamedDecl *PrevDecl = 0; 6078 DeclContext::lookup_result R = CurContext->getRedeclContext()->lookup(II); 6079 for (DeclContext::lookup_iterator I = R.begin(), E = R.end(); I != E; 6080 ++I) { 6081 if ((*I)->getIdentifierNamespace() & IDNS) { 6082 PrevDecl = *I; 6083 break; 6084 } 6085 } 6086 6087 PrevNS = dyn_cast_or_null<NamespaceDecl>(PrevDecl); 6088 6089 if (PrevNS) { 6090 // This is an extended namespace definition. 6091 if (IsInline != PrevNS->isInline()) 6092 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, Loc, II, 6093 &IsInline, PrevNS); 6094 } else if (PrevDecl) { 6095 // This is an invalid name redefinition. 6096 Diag(Loc, diag::err_redefinition_different_kind) 6097 << II; 6098 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6099 IsInvalid = true; 6100 // Continue on to push Namespc as current DeclContext and return it. 6101 } else if (II->isStr("std") && 6102 CurContext->getRedeclContext()->isTranslationUnit()) { 6103 // This is the first "real" definition of the namespace "std", so update 6104 // our cache of the "std" namespace to point at this definition. 6105 PrevNS = getStdNamespace(); 6106 IsStd = true; 6107 AddToKnown = !IsInline; 6108 } else { 6109 // We've seen this namespace for the first time. 6110 AddToKnown = !IsInline; 6111 } 6112 } else { 6113 // Anonymous namespaces. 6114 6115 // Determine whether the parent already has an anonymous namespace. 6116 DeclContext *Parent = CurContext->getRedeclContext(); 6117 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6118 PrevNS = TU->getAnonymousNamespace(); 6119 } else { 6120 NamespaceDecl *ND = cast<NamespaceDecl>(Parent); 6121 PrevNS = ND->getAnonymousNamespace(); 6122 } 6123 6124 if (PrevNS && IsInline != PrevNS->isInline()) 6125 DiagnoseNamespaceInlineMismatch(*this, NamespaceLoc, NamespaceLoc, II, 6126 &IsInline, PrevNS); 6127 } 6128 6129 NamespaceDecl *Namespc = NamespaceDecl::Create(Context, CurContext, IsInline, 6130 StartLoc, Loc, II, PrevNS); 6131 if (IsInvalid) 6132 Namespc->setInvalidDecl(); 6133 6134 ProcessDeclAttributeList(DeclRegionScope, Namespc, AttrList); 6135 6136 // FIXME: Should we be merging attributes? 6137 if (const VisibilityAttr *Attr = Namespc->getAttr<VisibilityAttr>()) 6138 PushNamespaceVisibilityAttr(Attr, Loc); 6139 6140 if (IsStd) 6141 StdNamespace = Namespc; 6142 if (AddToKnown) 6143 KnownNamespaces[Namespc] = false; 6144 6145 if (II) { 6146 PushOnScopeChains(Namespc, DeclRegionScope); 6147 } else { 6148 // Link the anonymous namespace into its parent. 6149 DeclContext *Parent = CurContext->getRedeclContext(); 6150 if (TranslationUnitDecl *TU = dyn_cast<TranslationUnitDecl>(Parent)) { 6151 TU->setAnonymousNamespace(Namespc); 6152 } else { 6153 cast<NamespaceDecl>(Parent)->setAnonymousNamespace(Namespc); 6154 } 6155 6156 CurContext->addDecl(Namespc); 6157 6158 // C++ [namespace.unnamed]p1. An unnamed-namespace-definition 6159 // behaves as if it were replaced by 6160 // namespace unique { /* empty body */ } 6161 // using namespace unique; 6162 // namespace unique { namespace-body } 6163 // where all occurrences of 'unique' in a translation unit are 6164 // replaced by the same identifier and this identifier differs 6165 // from all other identifiers in the entire program. 6166 6167 // We just create the namespace with an empty name and then add an 6168 // implicit using declaration, just like the standard suggests. 6169 // 6170 // CodeGen enforces the "universally unique" aspect by giving all 6171 // declarations semantically contained within an anonymous 6172 // namespace internal linkage. 6173 6174 if (!PrevNS) { 6175 UsingDirectiveDecl* UD 6176 = UsingDirectiveDecl::Create(Context, Parent, 6177 /* 'using' */ LBrace, 6178 /* 'namespace' */ SourceLocation(), 6179 /* qualifier */ NestedNameSpecifierLoc(), 6180 /* identifier */ SourceLocation(), 6181 Namespc, 6182 /* Ancestor */ Parent); 6183 UD->setImplicit(); 6184 Parent->addDecl(UD); 6185 } 6186 } 6187 6188 ActOnDocumentableDecl(Namespc); 6189 6190 // Although we could have an invalid decl (i.e. the namespace name is a 6191 // redefinition), push it as current DeclContext and try to continue parsing. 6192 // FIXME: We should be able to push Namespc here, so that the each DeclContext 6193 // for the namespace has the declarations that showed up in that particular 6194 // namespace definition. 6195 PushDeclContext(NamespcScope, Namespc); 6196 return Namespc; 6197} 6198 6199/// getNamespaceDecl - Returns the namespace a decl represents. If the decl 6200/// is a namespace alias, returns the namespace it points to. 6201static inline NamespaceDecl *getNamespaceDecl(NamedDecl *D) { 6202 if (NamespaceAliasDecl *AD = dyn_cast_or_null<NamespaceAliasDecl>(D)) 6203 return AD->getNamespace(); 6204 return dyn_cast_or_null<NamespaceDecl>(D); 6205} 6206 6207/// ActOnFinishNamespaceDef - This callback is called after a namespace is 6208/// exited. Decl is the DeclTy returned by ActOnStartNamespaceDef. 6209void Sema::ActOnFinishNamespaceDef(Decl *Dcl, SourceLocation RBrace) { 6210 NamespaceDecl *Namespc = dyn_cast_or_null<NamespaceDecl>(Dcl); 6211 assert(Namespc && "Invalid parameter, expected NamespaceDecl"); 6212 Namespc->setRBraceLoc(RBrace); 6213 PopDeclContext(); 6214 if (Namespc->hasAttr<VisibilityAttr>()) 6215 PopPragmaVisibility(true, RBrace); 6216} 6217 6218CXXRecordDecl *Sema::getStdBadAlloc() const { 6219 return cast_or_null<CXXRecordDecl>( 6220 StdBadAlloc.get(Context.getExternalSource())); 6221} 6222 6223NamespaceDecl *Sema::getStdNamespace() const { 6224 return cast_or_null<NamespaceDecl>( 6225 StdNamespace.get(Context.getExternalSource())); 6226} 6227 6228/// \brief Retrieve the special "std" namespace, which may require us to 6229/// implicitly define the namespace. 6230NamespaceDecl *Sema::getOrCreateStdNamespace() { 6231 if (!StdNamespace) { 6232 // The "std" namespace has not yet been defined, so build one implicitly. 6233 StdNamespace = NamespaceDecl::Create(Context, 6234 Context.getTranslationUnitDecl(), 6235 /*Inline=*/false, 6236 SourceLocation(), SourceLocation(), 6237 &PP.getIdentifierTable().get("std"), 6238 /*PrevDecl=*/0); 6239 getStdNamespace()->setImplicit(true); 6240 } 6241 6242 return getStdNamespace(); 6243} 6244 6245bool Sema::isStdInitializerList(QualType Ty, QualType *Element) { 6246 assert(getLangOpts().CPlusPlus && 6247 "Looking for std::initializer_list outside of C++."); 6248 6249 // We're looking for implicit instantiations of 6250 // template <typename E> class std::initializer_list. 6251 6252 if (!StdNamespace) // If we haven't seen namespace std yet, this can't be it. 6253 return false; 6254 6255 ClassTemplateDecl *Template = 0; 6256 const TemplateArgument *Arguments = 0; 6257 6258 if (const RecordType *RT = Ty->getAs<RecordType>()) { 6259 6260 ClassTemplateSpecializationDecl *Specialization = 6261 dyn_cast<ClassTemplateSpecializationDecl>(RT->getDecl()); 6262 if (!Specialization) 6263 return false; 6264 6265 Template = Specialization->getSpecializedTemplate(); 6266 Arguments = Specialization->getTemplateArgs().data(); 6267 } else if (const TemplateSpecializationType *TST = 6268 Ty->getAs<TemplateSpecializationType>()) { 6269 Template = dyn_cast_or_null<ClassTemplateDecl>( 6270 TST->getTemplateName().getAsTemplateDecl()); 6271 Arguments = TST->getArgs(); 6272 } 6273 if (!Template) 6274 return false; 6275 6276 if (!StdInitializerList) { 6277 // Haven't recognized std::initializer_list yet, maybe this is it. 6278 CXXRecordDecl *TemplateClass = Template->getTemplatedDecl(); 6279 if (TemplateClass->getIdentifier() != 6280 &PP.getIdentifierTable().get("initializer_list") || 6281 !getStdNamespace()->InEnclosingNamespaceSetOf( 6282 TemplateClass->getDeclContext())) 6283 return false; 6284 // This is a template called std::initializer_list, but is it the right 6285 // template? 6286 TemplateParameterList *Params = Template->getTemplateParameters(); 6287 if (Params->getMinRequiredArguments() != 1) 6288 return false; 6289 if (!isa<TemplateTypeParmDecl>(Params->getParam(0))) 6290 return false; 6291 6292 // It's the right template. 6293 StdInitializerList = Template; 6294 } 6295 6296 if (Template != StdInitializerList) 6297 return false; 6298 6299 // This is an instance of std::initializer_list. Find the argument type. 6300 if (Element) 6301 *Element = Arguments[0].getAsType(); 6302 return true; 6303} 6304 6305static ClassTemplateDecl *LookupStdInitializerList(Sema &S, SourceLocation Loc){ 6306 NamespaceDecl *Std = S.getStdNamespace(); 6307 if (!Std) { 6308 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6309 return 0; 6310 } 6311 6312 LookupResult Result(S, &S.PP.getIdentifierTable().get("initializer_list"), 6313 Loc, Sema::LookupOrdinaryName); 6314 if (!S.LookupQualifiedName(Result, Std)) { 6315 S.Diag(Loc, diag::err_implied_std_initializer_list_not_found); 6316 return 0; 6317 } 6318 ClassTemplateDecl *Template = Result.getAsSingle<ClassTemplateDecl>(); 6319 if (!Template) { 6320 Result.suppressDiagnostics(); 6321 // We found something weird. Complain about the first thing we found. 6322 NamedDecl *Found = *Result.begin(); 6323 S.Diag(Found->getLocation(), diag::err_malformed_std_initializer_list); 6324 return 0; 6325 } 6326 6327 // We found some template called std::initializer_list. Now verify that it's 6328 // correct. 6329 TemplateParameterList *Params = Template->getTemplateParameters(); 6330 if (Params->getMinRequiredArguments() != 1 || 6331 !isa<TemplateTypeParmDecl>(Params->getParam(0))) { 6332 S.Diag(Template->getLocation(), diag::err_malformed_std_initializer_list); 6333 return 0; 6334 } 6335 6336 return Template; 6337} 6338 6339QualType Sema::BuildStdInitializerList(QualType Element, SourceLocation Loc) { 6340 if (!StdInitializerList) { 6341 StdInitializerList = LookupStdInitializerList(*this, Loc); 6342 if (!StdInitializerList) 6343 return QualType(); 6344 } 6345 6346 TemplateArgumentListInfo Args(Loc, Loc); 6347 Args.addArgument(TemplateArgumentLoc(TemplateArgument(Element), 6348 Context.getTrivialTypeSourceInfo(Element, 6349 Loc))); 6350 return Context.getCanonicalType( 6351 CheckTemplateIdType(TemplateName(StdInitializerList), Loc, Args)); 6352} 6353 6354bool Sema::isInitListConstructor(const CXXConstructorDecl* Ctor) { 6355 // C++ [dcl.init.list]p2: 6356 // A constructor is an initializer-list constructor if its first parameter 6357 // is of type std::initializer_list<E> or reference to possibly cv-qualified 6358 // std::initializer_list<E> for some type E, and either there are no other 6359 // parameters or else all other parameters have default arguments. 6360 if (Ctor->getNumParams() < 1 || 6361 (Ctor->getNumParams() > 1 && !Ctor->getParamDecl(1)->hasDefaultArg())) 6362 return false; 6363 6364 QualType ArgType = Ctor->getParamDecl(0)->getType(); 6365 if (const ReferenceType *RT = ArgType->getAs<ReferenceType>()) 6366 ArgType = RT->getPointeeType().getUnqualifiedType(); 6367 6368 return isStdInitializerList(ArgType, 0); 6369} 6370 6371/// \brief Determine whether a using statement is in a context where it will be 6372/// apply in all contexts. 6373static bool IsUsingDirectiveInToplevelContext(DeclContext *CurContext) { 6374 switch (CurContext->getDeclKind()) { 6375 case Decl::TranslationUnit: 6376 return true; 6377 case Decl::LinkageSpec: 6378 return IsUsingDirectiveInToplevelContext(CurContext->getParent()); 6379 default: 6380 return false; 6381 } 6382} 6383 6384namespace { 6385 6386// Callback to only accept typo corrections that are namespaces. 6387class NamespaceValidatorCCC : public CorrectionCandidateCallback { 6388 public: 6389 virtual bool ValidateCandidate(const TypoCorrection &candidate) { 6390 if (NamedDecl *ND = candidate.getCorrectionDecl()) { 6391 return isa<NamespaceDecl>(ND) || isa<NamespaceAliasDecl>(ND); 6392 } 6393 return false; 6394 } 6395}; 6396 6397} 6398 6399static bool TryNamespaceTypoCorrection(Sema &S, LookupResult &R, Scope *Sc, 6400 CXXScopeSpec &SS, 6401 SourceLocation IdentLoc, 6402 IdentifierInfo *Ident) { 6403 NamespaceValidatorCCC Validator; 6404 R.clear(); 6405 if (TypoCorrection Corrected = S.CorrectTypo(R.getLookupNameInfo(), 6406 R.getLookupKind(), Sc, &SS, 6407 Validator)) { 6408 std::string CorrectedStr(Corrected.getAsString(S.getLangOpts())); 6409 std::string CorrectedQuotedStr(Corrected.getQuoted(S.getLangOpts())); 6410 if (DeclContext *DC = S.computeDeclContext(SS, false)) 6411 S.Diag(IdentLoc, diag::err_using_directive_member_suggest) 6412 << Ident << DC << CorrectedQuotedStr << SS.getRange() 6413 << FixItHint::CreateReplacement(Corrected.getCorrectionRange(), 6414 CorrectedStr); 6415 else 6416 S.Diag(IdentLoc, diag::err_using_directive_suggest) 6417 << Ident << CorrectedQuotedStr 6418 << FixItHint::CreateReplacement(IdentLoc, CorrectedStr); 6419 6420 S.Diag(Corrected.getCorrectionDecl()->getLocation(), 6421 diag::note_namespace_defined_here) << CorrectedQuotedStr; 6422 6423 R.addDecl(Corrected.getCorrectionDecl()); 6424 return true; 6425 } 6426 return false; 6427} 6428 6429Decl *Sema::ActOnUsingDirective(Scope *S, 6430 SourceLocation UsingLoc, 6431 SourceLocation NamespcLoc, 6432 CXXScopeSpec &SS, 6433 SourceLocation IdentLoc, 6434 IdentifierInfo *NamespcName, 6435 AttributeList *AttrList) { 6436 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6437 assert(NamespcName && "Invalid NamespcName."); 6438 assert(IdentLoc.isValid() && "Invalid NamespceName location."); 6439 6440 // This can only happen along a recovery path. 6441 while (S->getFlags() & Scope::TemplateParamScope) 6442 S = S->getParent(); 6443 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6444 6445 UsingDirectiveDecl *UDir = 0; 6446 NestedNameSpecifier *Qualifier = 0; 6447 if (SS.isSet()) 6448 Qualifier = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 6449 6450 // Lookup namespace name. 6451 LookupResult R(*this, NamespcName, IdentLoc, LookupNamespaceName); 6452 LookupParsedName(R, S, &SS); 6453 if (R.isAmbiguous()) 6454 return 0; 6455 6456 if (R.empty()) { 6457 R.clear(); 6458 // Allow "using namespace std;" or "using namespace ::std;" even if 6459 // "std" hasn't been defined yet, for GCC compatibility. 6460 if ((!Qualifier || Qualifier->getKind() == NestedNameSpecifier::Global) && 6461 NamespcName->isStr("std")) { 6462 Diag(IdentLoc, diag::ext_using_undefined_std); 6463 R.addDecl(getOrCreateStdNamespace()); 6464 R.resolveKind(); 6465 } 6466 // Otherwise, attempt typo correction. 6467 else TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, NamespcName); 6468 } 6469 6470 if (!R.empty()) { 6471 NamedDecl *Named = R.getFoundDecl(); 6472 assert((isa<NamespaceDecl>(Named) || isa<NamespaceAliasDecl>(Named)) 6473 && "expected namespace decl"); 6474 // C++ [namespace.udir]p1: 6475 // A using-directive specifies that the names in the nominated 6476 // namespace can be used in the scope in which the 6477 // using-directive appears after the using-directive. During 6478 // unqualified name lookup (3.4.1), the names appear as if they 6479 // were declared in the nearest enclosing namespace which 6480 // contains both the using-directive and the nominated 6481 // namespace. [Note: in this context, "contains" means "contains 6482 // directly or indirectly". ] 6483 6484 // Find enclosing context containing both using-directive and 6485 // nominated namespace. 6486 NamespaceDecl *NS = getNamespaceDecl(Named); 6487 DeclContext *CommonAncestor = cast<DeclContext>(NS); 6488 while (CommonAncestor && !CommonAncestor->Encloses(CurContext)) 6489 CommonAncestor = CommonAncestor->getParent(); 6490 6491 UDir = UsingDirectiveDecl::Create(Context, CurContext, UsingLoc, NamespcLoc, 6492 SS.getWithLocInContext(Context), 6493 IdentLoc, Named, CommonAncestor); 6494 6495 if (IsUsingDirectiveInToplevelContext(CurContext) && 6496 !SourceMgr.isFromMainFile(SourceMgr.getExpansionLoc(IdentLoc))) { 6497 Diag(IdentLoc, diag::warn_using_directive_in_header); 6498 } 6499 6500 PushUsingDirective(S, UDir); 6501 } else { 6502 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 6503 } 6504 6505 if (UDir) 6506 ProcessDeclAttributeList(S, UDir, AttrList); 6507 6508 return UDir; 6509} 6510 6511void Sema::PushUsingDirective(Scope *S, UsingDirectiveDecl *UDir) { 6512 // If the scope has an associated entity and the using directive is at 6513 // namespace or translation unit scope, add the UsingDirectiveDecl into 6514 // its lookup structure so qualified name lookup can find it. 6515 DeclContext *Ctx = static_cast<DeclContext*>(S->getEntity()); 6516 if (Ctx && !Ctx->isFunctionOrMethod()) 6517 Ctx->addDecl(UDir); 6518 else 6519 // Otherwise, it is at block sope. The using-directives will affect lookup 6520 // only to the end of the scope. 6521 S->PushUsingDirective(UDir); 6522} 6523 6524 6525Decl *Sema::ActOnUsingDeclaration(Scope *S, 6526 AccessSpecifier AS, 6527 bool HasUsingKeyword, 6528 SourceLocation UsingLoc, 6529 CXXScopeSpec &SS, 6530 UnqualifiedId &Name, 6531 AttributeList *AttrList, 6532 bool IsTypeName, 6533 SourceLocation TypenameLoc) { 6534 assert(S->getFlags() & Scope::DeclScope && "Invalid Scope."); 6535 6536 switch (Name.getKind()) { 6537 case UnqualifiedId::IK_ImplicitSelfParam: 6538 case UnqualifiedId::IK_Identifier: 6539 case UnqualifiedId::IK_OperatorFunctionId: 6540 case UnqualifiedId::IK_LiteralOperatorId: 6541 case UnqualifiedId::IK_ConversionFunctionId: 6542 break; 6543 6544 case UnqualifiedId::IK_ConstructorName: 6545 case UnqualifiedId::IK_ConstructorTemplateId: 6546 // C++11 inheriting constructors. 6547 Diag(Name.getLocStart(), 6548 getLangOpts().CPlusPlus11 ? 6549 diag::warn_cxx98_compat_using_decl_constructor : 6550 diag::err_using_decl_constructor) 6551 << SS.getRange(); 6552 6553 if (getLangOpts().CPlusPlus11) break; 6554 6555 return 0; 6556 6557 case UnqualifiedId::IK_DestructorName: 6558 Diag(Name.getLocStart(), diag::err_using_decl_destructor) 6559 << SS.getRange(); 6560 return 0; 6561 6562 case UnqualifiedId::IK_TemplateId: 6563 Diag(Name.getLocStart(), diag::err_using_decl_template_id) 6564 << SourceRange(Name.TemplateId->LAngleLoc, Name.TemplateId->RAngleLoc); 6565 return 0; 6566 } 6567 6568 DeclarationNameInfo TargetNameInfo = GetNameFromUnqualifiedId(Name); 6569 DeclarationName TargetName = TargetNameInfo.getName(); 6570 if (!TargetName) 6571 return 0; 6572 6573 // Warn about access declarations. 6574 // TODO: store that the declaration was written without 'using' and 6575 // talk about access decls instead of using decls in the 6576 // diagnostics. 6577 if (!HasUsingKeyword) { 6578 UsingLoc = Name.getLocStart(); 6579 6580 Diag(UsingLoc, diag::warn_access_decl_deprecated) 6581 << FixItHint::CreateInsertion(SS.getRange().getBegin(), "using "); 6582 } 6583 6584 if (DiagnoseUnexpandedParameterPack(SS, UPPC_UsingDeclaration) || 6585 DiagnoseUnexpandedParameterPack(TargetNameInfo, UPPC_UsingDeclaration)) 6586 return 0; 6587 6588 NamedDecl *UD = BuildUsingDeclaration(S, AS, UsingLoc, SS, 6589 TargetNameInfo, AttrList, 6590 /* IsInstantiation */ false, 6591 IsTypeName, TypenameLoc); 6592 if (UD) 6593 PushOnScopeChains(UD, S, /*AddToContext*/ false); 6594 6595 return UD; 6596} 6597 6598/// \brief Determine whether a using declaration considers the given 6599/// declarations as "equivalent", e.g., if they are redeclarations of 6600/// the same entity or are both typedefs of the same type. 6601static bool 6602IsEquivalentForUsingDecl(ASTContext &Context, NamedDecl *D1, NamedDecl *D2, 6603 bool &SuppressRedeclaration) { 6604 if (D1->getCanonicalDecl() == D2->getCanonicalDecl()) { 6605 SuppressRedeclaration = false; 6606 return true; 6607 } 6608 6609 if (TypedefNameDecl *TD1 = dyn_cast<TypedefNameDecl>(D1)) 6610 if (TypedefNameDecl *TD2 = dyn_cast<TypedefNameDecl>(D2)) { 6611 SuppressRedeclaration = true; 6612 return Context.hasSameType(TD1->getUnderlyingType(), 6613 TD2->getUnderlyingType()); 6614 } 6615 6616 return false; 6617} 6618 6619 6620/// Determines whether to create a using shadow decl for a particular 6621/// decl, given the set of decls existing prior to this using lookup. 6622bool Sema::CheckUsingShadowDecl(UsingDecl *Using, NamedDecl *Orig, 6623 const LookupResult &Previous) { 6624 // Diagnose finding a decl which is not from a base class of the 6625 // current class. We do this now because there are cases where this 6626 // function will silently decide not to build a shadow decl, which 6627 // will pre-empt further diagnostics. 6628 // 6629 // We don't need to do this in C++0x because we do the check once on 6630 // the qualifier. 6631 // 6632 // FIXME: diagnose the following if we care enough: 6633 // struct A { int foo; }; 6634 // struct B : A { using A::foo; }; 6635 // template <class T> struct C : A {}; 6636 // template <class T> struct D : C<T> { using B::foo; } // <--- 6637 // This is invalid (during instantiation) in C++03 because B::foo 6638 // resolves to the using decl in B, which is not a base class of D<T>. 6639 // We can't diagnose it immediately because C<T> is an unknown 6640 // specialization. The UsingShadowDecl in D<T> then points directly 6641 // to A::foo, which will look well-formed when we instantiate. 6642 // The right solution is to not collapse the shadow-decl chain. 6643 if (!getLangOpts().CPlusPlus11 && CurContext->isRecord()) { 6644 DeclContext *OrigDC = Orig->getDeclContext(); 6645 6646 // Handle enums and anonymous structs. 6647 if (isa<EnumDecl>(OrigDC)) OrigDC = OrigDC->getParent(); 6648 CXXRecordDecl *OrigRec = cast<CXXRecordDecl>(OrigDC); 6649 while (OrigRec->isAnonymousStructOrUnion()) 6650 OrigRec = cast<CXXRecordDecl>(OrigRec->getDeclContext()); 6651 6652 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom(OrigRec)) { 6653 if (OrigDC == CurContext) { 6654 Diag(Using->getLocation(), 6655 diag::err_using_decl_nested_name_specifier_is_current_class) 6656 << Using->getQualifierLoc().getSourceRange(); 6657 Diag(Orig->getLocation(), diag::note_using_decl_target); 6658 return true; 6659 } 6660 6661 Diag(Using->getQualifierLoc().getBeginLoc(), 6662 diag::err_using_decl_nested_name_specifier_is_not_base_class) 6663 << Using->getQualifier() 6664 << cast<CXXRecordDecl>(CurContext) 6665 << Using->getQualifierLoc().getSourceRange(); 6666 Diag(Orig->getLocation(), diag::note_using_decl_target); 6667 return true; 6668 } 6669 } 6670 6671 if (Previous.empty()) return false; 6672 6673 NamedDecl *Target = Orig; 6674 if (isa<UsingShadowDecl>(Target)) 6675 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6676 6677 // If the target happens to be one of the previous declarations, we 6678 // don't have a conflict. 6679 // 6680 // FIXME: but we might be increasing its access, in which case we 6681 // should redeclare it. 6682 NamedDecl *NonTag = 0, *Tag = 0; 6683 for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); 6684 I != E; ++I) { 6685 NamedDecl *D = (*I)->getUnderlyingDecl(); 6686 bool Result; 6687 if (IsEquivalentForUsingDecl(Context, D, Target, Result)) 6688 return Result; 6689 6690 (isa<TagDecl>(D) ? Tag : NonTag) = D; 6691 } 6692 6693 if (Target->isFunctionOrFunctionTemplate()) { 6694 FunctionDecl *FD; 6695 if (isa<FunctionTemplateDecl>(Target)) 6696 FD = cast<FunctionTemplateDecl>(Target)->getTemplatedDecl(); 6697 else 6698 FD = cast<FunctionDecl>(Target); 6699 6700 NamedDecl *OldDecl = 0; 6701 switch (CheckOverload(0, FD, Previous, OldDecl, /*IsForUsingDecl*/ true)) { 6702 case Ovl_Overload: 6703 return false; 6704 6705 case Ovl_NonFunction: 6706 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6707 break; 6708 6709 // We found a decl with the exact signature. 6710 case Ovl_Match: 6711 // If we're in a record, we want to hide the target, so we 6712 // return true (without a diagnostic) to tell the caller not to 6713 // build a shadow decl. 6714 if (CurContext->isRecord()) 6715 return true; 6716 6717 // If we're not in a record, this is an error. 6718 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6719 break; 6720 } 6721 6722 Diag(Target->getLocation(), diag::note_using_decl_target); 6723 Diag(OldDecl->getLocation(), diag::note_using_decl_conflict); 6724 return true; 6725 } 6726 6727 // Target is not a function. 6728 6729 if (isa<TagDecl>(Target)) { 6730 // No conflict between a tag and a non-tag. 6731 if (!Tag) return false; 6732 6733 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6734 Diag(Target->getLocation(), diag::note_using_decl_target); 6735 Diag(Tag->getLocation(), diag::note_using_decl_conflict); 6736 return true; 6737 } 6738 6739 // No conflict between a tag and a non-tag. 6740 if (!NonTag) return false; 6741 6742 Diag(Using->getLocation(), diag::err_using_decl_conflict); 6743 Diag(Target->getLocation(), diag::note_using_decl_target); 6744 Diag(NonTag->getLocation(), diag::note_using_decl_conflict); 6745 return true; 6746} 6747 6748/// Builds a shadow declaration corresponding to a 'using' declaration. 6749UsingShadowDecl *Sema::BuildUsingShadowDecl(Scope *S, 6750 UsingDecl *UD, 6751 NamedDecl *Orig) { 6752 6753 // If we resolved to another shadow declaration, just coalesce them. 6754 NamedDecl *Target = Orig; 6755 if (isa<UsingShadowDecl>(Target)) { 6756 Target = cast<UsingShadowDecl>(Target)->getTargetDecl(); 6757 assert(!isa<UsingShadowDecl>(Target) && "nested shadow declaration"); 6758 } 6759 6760 UsingShadowDecl *Shadow 6761 = UsingShadowDecl::Create(Context, CurContext, 6762 UD->getLocation(), UD, Target); 6763 UD->addShadowDecl(Shadow); 6764 6765 Shadow->setAccess(UD->getAccess()); 6766 if (Orig->isInvalidDecl() || UD->isInvalidDecl()) 6767 Shadow->setInvalidDecl(); 6768 6769 if (S) 6770 PushOnScopeChains(Shadow, S); 6771 else 6772 CurContext->addDecl(Shadow); 6773 6774 6775 return Shadow; 6776} 6777 6778/// Hides a using shadow declaration. This is required by the current 6779/// using-decl implementation when a resolvable using declaration in a 6780/// class is followed by a declaration which would hide or override 6781/// one or more of the using decl's targets; for example: 6782/// 6783/// struct Base { void foo(int); }; 6784/// struct Derived : Base { 6785/// using Base::foo; 6786/// void foo(int); 6787/// }; 6788/// 6789/// The governing language is C++03 [namespace.udecl]p12: 6790/// 6791/// When a using-declaration brings names from a base class into a 6792/// derived class scope, member functions in the derived class 6793/// override and/or hide member functions with the same name and 6794/// parameter types in a base class (rather than conflicting). 6795/// 6796/// There are two ways to implement this: 6797/// (1) optimistically create shadow decls when they're not hidden 6798/// by existing declarations, or 6799/// (2) don't create any shadow decls (or at least don't make them 6800/// visible) until we've fully parsed/instantiated the class. 6801/// The problem with (1) is that we might have to retroactively remove 6802/// a shadow decl, which requires several O(n) operations because the 6803/// decl structures are (very reasonably) not designed for removal. 6804/// (2) avoids this but is very fiddly and phase-dependent. 6805void Sema::HideUsingShadowDecl(Scope *S, UsingShadowDecl *Shadow) { 6806 if (Shadow->getDeclName().getNameKind() == 6807 DeclarationName::CXXConversionFunctionName) 6808 cast<CXXRecordDecl>(Shadow->getDeclContext())->removeConversion(Shadow); 6809 6810 // Remove it from the DeclContext... 6811 Shadow->getDeclContext()->removeDecl(Shadow); 6812 6813 // ...and the scope, if applicable... 6814 if (S) { 6815 S->RemoveDecl(Shadow); 6816 IdResolver.RemoveDecl(Shadow); 6817 } 6818 6819 // ...and the using decl. 6820 Shadow->getUsingDecl()->removeShadowDecl(Shadow); 6821 6822 // TODO: complain somehow if Shadow was used. It shouldn't 6823 // be possible for this to happen, because...? 6824} 6825 6826/// Builds a using declaration. 6827/// 6828/// \param IsInstantiation - Whether this call arises from an 6829/// instantiation of an unresolved using declaration. We treat 6830/// the lookup differently for these declarations. 6831NamedDecl *Sema::BuildUsingDeclaration(Scope *S, AccessSpecifier AS, 6832 SourceLocation UsingLoc, 6833 CXXScopeSpec &SS, 6834 const DeclarationNameInfo &NameInfo, 6835 AttributeList *AttrList, 6836 bool IsInstantiation, 6837 bool IsTypeName, 6838 SourceLocation TypenameLoc) { 6839 assert(!SS.isInvalid() && "Invalid CXXScopeSpec."); 6840 SourceLocation IdentLoc = NameInfo.getLoc(); 6841 assert(IdentLoc.isValid() && "Invalid TargetName location."); 6842 6843 // FIXME: We ignore attributes for now. 6844 6845 if (SS.isEmpty()) { 6846 Diag(IdentLoc, diag::err_using_requires_qualname); 6847 return 0; 6848 } 6849 6850 // Do the redeclaration lookup in the current scope. 6851 LookupResult Previous(*this, NameInfo, LookupUsingDeclName, 6852 ForRedeclaration); 6853 Previous.setHideTags(false); 6854 if (S) { 6855 LookupName(Previous, S); 6856 6857 // It is really dumb that we have to do this. 6858 LookupResult::Filter F = Previous.makeFilter(); 6859 while (F.hasNext()) { 6860 NamedDecl *D = F.next(); 6861 if (!isDeclInScope(D, CurContext, S)) 6862 F.erase(); 6863 } 6864 F.done(); 6865 } else { 6866 assert(IsInstantiation && "no scope in non-instantiation"); 6867 assert(CurContext->isRecord() && "scope not record in instantiation"); 6868 LookupQualifiedName(Previous, CurContext); 6869 } 6870 6871 // Check for invalid redeclarations. 6872 if (CheckUsingDeclRedeclaration(UsingLoc, IsTypeName, SS, IdentLoc, Previous)) 6873 return 0; 6874 6875 // Check for bad qualifiers. 6876 if (CheckUsingDeclQualifier(UsingLoc, SS, IdentLoc)) 6877 return 0; 6878 6879 DeclContext *LookupContext = computeDeclContext(SS); 6880 NamedDecl *D; 6881 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 6882 if (!LookupContext) { 6883 if (IsTypeName) { 6884 // FIXME: not all declaration name kinds are legal here 6885 D = UnresolvedUsingTypenameDecl::Create(Context, CurContext, 6886 UsingLoc, TypenameLoc, 6887 QualifierLoc, 6888 IdentLoc, NameInfo.getName()); 6889 } else { 6890 D = UnresolvedUsingValueDecl::Create(Context, CurContext, UsingLoc, 6891 QualifierLoc, NameInfo); 6892 } 6893 } else { 6894 D = UsingDecl::Create(Context, CurContext, UsingLoc, QualifierLoc, 6895 NameInfo, IsTypeName); 6896 } 6897 D->setAccess(AS); 6898 CurContext->addDecl(D); 6899 6900 if (!LookupContext) return D; 6901 UsingDecl *UD = cast<UsingDecl>(D); 6902 6903 if (RequireCompleteDeclContext(SS, LookupContext)) { 6904 UD->setInvalidDecl(); 6905 return UD; 6906 } 6907 6908 // The normal rules do not apply to inheriting constructor declarations. 6909 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName) { 6910 if (CheckInheritingConstructorUsingDecl(UD)) 6911 UD->setInvalidDecl(); 6912 return UD; 6913 } 6914 6915 // Otherwise, look up the target name. 6916 6917 LookupResult R(*this, NameInfo, LookupOrdinaryName); 6918 6919 // Unlike most lookups, we don't always want to hide tag 6920 // declarations: tag names are visible through the using declaration 6921 // even if hidden by ordinary names, *except* in a dependent context 6922 // where it's important for the sanity of two-phase lookup. 6923 if (!IsInstantiation) 6924 R.setHideTags(false); 6925 6926 // For the purposes of this lookup, we have a base object type 6927 // equal to that of the current context. 6928 if (CurContext->isRecord()) { 6929 R.setBaseObjectType( 6930 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext))); 6931 } 6932 6933 LookupQualifiedName(R, LookupContext); 6934 6935 if (R.empty()) { 6936 Diag(IdentLoc, diag::err_no_member) 6937 << NameInfo.getName() << LookupContext << SS.getRange(); 6938 UD->setInvalidDecl(); 6939 return UD; 6940 } 6941 6942 if (R.isAmbiguous()) { 6943 UD->setInvalidDecl(); 6944 return UD; 6945 } 6946 6947 if (IsTypeName) { 6948 // If we asked for a typename and got a non-type decl, error out. 6949 if (!R.getAsSingle<TypeDecl>()) { 6950 Diag(IdentLoc, diag::err_using_typename_non_type); 6951 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) 6952 Diag((*I)->getUnderlyingDecl()->getLocation(), 6953 diag::note_using_decl_target); 6954 UD->setInvalidDecl(); 6955 return UD; 6956 } 6957 } else { 6958 // If we asked for a non-typename and we got a type, error out, 6959 // but only if this is an instantiation of an unresolved using 6960 // decl. Otherwise just silently find the type name. 6961 if (IsInstantiation && R.getAsSingle<TypeDecl>()) { 6962 Diag(IdentLoc, diag::err_using_dependent_value_is_type); 6963 Diag(R.getFoundDecl()->getLocation(), diag::note_using_decl_target); 6964 UD->setInvalidDecl(); 6965 return UD; 6966 } 6967 } 6968 6969 // C++0x N2914 [namespace.udecl]p6: 6970 // A using-declaration shall not name a namespace. 6971 if (R.getAsSingle<NamespaceDecl>()) { 6972 Diag(IdentLoc, diag::err_using_decl_can_not_refer_to_namespace) 6973 << SS.getRange(); 6974 UD->setInvalidDecl(); 6975 return UD; 6976 } 6977 6978 for (LookupResult::iterator I = R.begin(), E = R.end(); I != E; ++I) { 6979 if (!CheckUsingShadowDecl(UD, *I, Previous)) 6980 BuildUsingShadowDecl(S, UD, *I); 6981 } 6982 6983 return UD; 6984} 6985 6986/// Additional checks for a using declaration referring to a constructor name. 6987bool Sema::CheckInheritingConstructorUsingDecl(UsingDecl *UD) { 6988 assert(!UD->isTypeName() && "expecting a constructor name"); 6989 6990 const Type *SourceType = UD->getQualifier()->getAsType(); 6991 assert(SourceType && 6992 "Using decl naming constructor doesn't have type in scope spec."); 6993 CXXRecordDecl *TargetClass = cast<CXXRecordDecl>(CurContext); 6994 6995 // Check whether the named type is a direct base class. 6996 CanQualType CanonicalSourceType = SourceType->getCanonicalTypeUnqualified(); 6997 CXXRecordDecl::base_class_iterator BaseIt, BaseE; 6998 for (BaseIt = TargetClass->bases_begin(), BaseE = TargetClass->bases_end(); 6999 BaseIt != BaseE; ++BaseIt) { 7000 CanQualType BaseType = BaseIt->getType()->getCanonicalTypeUnqualified(); 7001 if (CanonicalSourceType == BaseType) 7002 break; 7003 if (BaseIt->getType()->isDependentType()) 7004 break; 7005 } 7006 7007 if (BaseIt == BaseE) { 7008 // Did not find SourceType in the bases. 7009 Diag(UD->getUsingLocation(), 7010 diag::err_using_decl_constructor_not_in_direct_base) 7011 << UD->getNameInfo().getSourceRange() 7012 << QualType(SourceType, 0) << TargetClass; 7013 return true; 7014 } 7015 7016 if (!CurContext->isDependentContext()) 7017 BaseIt->setInheritConstructors(); 7018 7019 return false; 7020} 7021 7022/// Checks that the given using declaration is not an invalid 7023/// redeclaration. Note that this is checking only for the using decl 7024/// itself, not for any ill-formedness among the UsingShadowDecls. 7025bool Sema::CheckUsingDeclRedeclaration(SourceLocation UsingLoc, 7026 bool isTypeName, 7027 const CXXScopeSpec &SS, 7028 SourceLocation NameLoc, 7029 const LookupResult &Prev) { 7030 // C++03 [namespace.udecl]p8: 7031 // C++0x [namespace.udecl]p10: 7032 // A using-declaration is a declaration and can therefore be used 7033 // repeatedly where (and only where) multiple declarations are 7034 // allowed. 7035 // 7036 // That's in non-member contexts. 7037 if (!CurContext->getRedeclContext()->isRecord()) 7038 return false; 7039 7040 NestedNameSpecifier *Qual 7041 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 7042 7043 for (LookupResult::iterator I = Prev.begin(), E = Prev.end(); I != E; ++I) { 7044 NamedDecl *D = *I; 7045 7046 bool DTypename; 7047 NestedNameSpecifier *DQual; 7048 if (UsingDecl *UD = dyn_cast<UsingDecl>(D)) { 7049 DTypename = UD->isTypeName(); 7050 DQual = UD->getQualifier(); 7051 } else if (UnresolvedUsingValueDecl *UD 7052 = dyn_cast<UnresolvedUsingValueDecl>(D)) { 7053 DTypename = false; 7054 DQual = UD->getQualifier(); 7055 } else if (UnresolvedUsingTypenameDecl *UD 7056 = dyn_cast<UnresolvedUsingTypenameDecl>(D)) { 7057 DTypename = true; 7058 DQual = UD->getQualifier(); 7059 } else continue; 7060 7061 // using decls differ if one says 'typename' and the other doesn't. 7062 // FIXME: non-dependent using decls? 7063 if (isTypeName != DTypename) continue; 7064 7065 // using decls differ if they name different scopes (but note that 7066 // template instantiation can cause this check to trigger when it 7067 // didn't before instantiation). 7068 if (Context.getCanonicalNestedNameSpecifier(Qual) != 7069 Context.getCanonicalNestedNameSpecifier(DQual)) 7070 continue; 7071 7072 Diag(NameLoc, diag::err_using_decl_redeclaration) << SS.getRange(); 7073 Diag(D->getLocation(), diag::note_using_decl) << 1; 7074 return true; 7075 } 7076 7077 return false; 7078} 7079 7080 7081/// Checks that the given nested-name qualifier used in a using decl 7082/// in the current context is appropriately related to the current 7083/// scope. If an error is found, diagnoses it and returns true. 7084bool Sema::CheckUsingDeclQualifier(SourceLocation UsingLoc, 7085 const CXXScopeSpec &SS, 7086 SourceLocation NameLoc) { 7087 DeclContext *NamedContext = computeDeclContext(SS); 7088 7089 if (!CurContext->isRecord()) { 7090 // C++03 [namespace.udecl]p3: 7091 // C++0x [namespace.udecl]p8: 7092 // A using-declaration for a class member shall be a member-declaration. 7093 7094 // If we weren't able to compute a valid scope, it must be a 7095 // dependent class scope. 7096 if (!NamedContext || NamedContext->isRecord()) { 7097 Diag(NameLoc, diag::err_using_decl_can_not_refer_to_class_member) 7098 << SS.getRange(); 7099 return true; 7100 } 7101 7102 // Otherwise, everything is known to be fine. 7103 return false; 7104 } 7105 7106 // The current scope is a record. 7107 7108 // If the named context is dependent, we can't decide much. 7109 if (!NamedContext) { 7110 // FIXME: in C++0x, we can diagnose if we can prove that the 7111 // nested-name-specifier does not refer to a base class, which is 7112 // still possible in some cases. 7113 7114 // Otherwise we have to conservatively report that things might be 7115 // okay. 7116 return false; 7117 } 7118 7119 if (!NamedContext->isRecord()) { 7120 // Ideally this would point at the last name in the specifier, 7121 // but we don't have that level of source info. 7122 Diag(SS.getRange().getBegin(), 7123 diag::err_using_decl_nested_name_specifier_is_not_class) 7124 << (NestedNameSpecifier*) SS.getScopeRep() << SS.getRange(); 7125 return true; 7126 } 7127 7128 if (!NamedContext->isDependentContext() && 7129 RequireCompleteDeclContext(const_cast<CXXScopeSpec&>(SS), NamedContext)) 7130 return true; 7131 7132 if (getLangOpts().CPlusPlus11) { 7133 // C++0x [namespace.udecl]p3: 7134 // In a using-declaration used as a member-declaration, the 7135 // nested-name-specifier shall name a base class of the class 7136 // being defined. 7137 7138 if (cast<CXXRecordDecl>(CurContext)->isProvablyNotDerivedFrom( 7139 cast<CXXRecordDecl>(NamedContext))) { 7140 if (CurContext == NamedContext) { 7141 Diag(NameLoc, 7142 diag::err_using_decl_nested_name_specifier_is_current_class) 7143 << SS.getRange(); 7144 return true; 7145 } 7146 7147 Diag(SS.getRange().getBegin(), 7148 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7149 << (NestedNameSpecifier*) SS.getScopeRep() 7150 << cast<CXXRecordDecl>(CurContext) 7151 << SS.getRange(); 7152 return true; 7153 } 7154 7155 return false; 7156 } 7157 7158 // C++03 [namespace.udecl]p4: 7159 // A using-declaration used as a member-declaration shall refer 7160 // to a member of a base class of the class being defined [etc.]. 7161 7162 // Salient point: SS doesn't have to name a base class as long as 7163 // lookup only finds members from base classes. Therefore we can 7164 // diagnose here only if we can prove that that can't happen, 7165 // i.e. if the class hierarchies provably don't intersect. 7166 7167 // TODO: it would be nice if "definitely valid" results were cached 7168 // in the UsingDecl and UsingShadowDecl so that these checks didn't 7169 // need to be repeated. 7170 7171 struct UserData { 7172 llvm::SmallPtrSet<const CXXRecordDecl*, 4> Bases; 7173 7174 static bool collect(const CXXRecordDecl *Base, void *OpaqueData) { 7175 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7176 Data->Bases.insert(Base); 7177 return true; 7178 } 7179 7180 bool hasDependentBases(const CXXRecordDecl *Class) { 7181 return !Class->forallBases(collect, this); 7182 } 7183 7184 /// Returns true if the base is dependent or is one of the 7185 /// accumulated base classes. 7186 static bool doesNotContain(const CXXRecordDecl *Base, void *OpaqueData) { 7187 UserData *Data = reinterpret_cast<UserData*>(OpaqueData); 7188 return !Data->Bases.count(Base); 7189 } 7190 7191 bool mightShareBases(const CXXRecordDecl *Class) { 7192 return Bases.count(Class) || !Class->forallBases(doesNotContain, this); 7193 } 7194 }; 7195 7196 UserData Data; 7197 7198 // Returns false if we find a dependent base. 7199 if (Data.hasDependentBases(cast<CXXRecordDecl>(CurContext))) 7200 return false; 7201 7202 // Returns false if the class has a dependent base or if it or one 7203 // of its bases is present in the base set of the current context. 7204 if (Data.mightShareBases(cast<CXXRecordDecl>(NamedContext))) 7205 return false; 7206 7207 Diag(SS.getRange().getBegin(), 7208 diag::err_using_decl_nested_name_specifier_is_not_base_class) 7209 << (NestedNameSpecifier*) SS.getScopeRep() 7210 << cast<CXXRecordDecl>(CurContext) 7211 << SS.getRange(); 7212 7213 return true; 7214} 7215 7216Decl *Sema::ActOnAliasDeclaration(Scope *S, 7217 AccessSpecifier AS, 7218 MultiTemplateParamsArg TemplateParamLists, 7219 SourceLocation UsingLoc, 7220 UnqualifiedId &Name, 7221 AttributeList *AttrList, 7222 TypeResult Type) { 7223 // Skip up to the relevant declaration scope. 7224 while (S->getFlags() & Scope::TemplateParamScope) 7225 S = S->getParent(); 7226 assert((S->getFlags() & Scope::DeclScope) && 7227 "got alias-declaration outside of declaration scope"); 7228 7229 if (Type.isInvalid()) 7230 return 0; 7231 7232 bool Invalid = false; 7233 DeclarationNameInfo NameInfo = GetNameFromUnqualifiedId(Name); 7234 TypeSourceInfo *TInfo = 0; 7235 GetTypeFromParser(Type.get(), &TInfo); 7236 7237 if (DiagnoseClassNameShadow(CurContext, NameInfo)) 7238 return 0; 7239 7240 if (DiagnoseUnexpandedParameterPack(Name.StartLocation, TInfo, 7241 UPPC_DeclarationType)) { 7242 Invalid = true; 7243 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 7244 TInfo->getTypeLoc().getBeginLoc()); 7245 } 7246 7247 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, ForRedeclaration); 7248 LookupName(Previous, S); 7249 7250 // Warn about shadowing the name of a template parameter. 7251 if (Previous.isSingleResult() && 7252 Previous.getFoundDecl()->isTemplateParameter()) { 7253 DiagnoseTemplateParameterShadow(Name.StartLocation,Previous.getFoundDecl()); 7254 Previous.clear(); 7255 } 7256 7257 assert(Name.Kind == UnqualifiedId::IK_Identifier && 7258 "name in alias declaration must be an identifier"); 7259 TypeAliasDecl *NewTD = TypeAliasDecl::Create(Context, CurContext, UsingLoc, 7260 Name.StartLocation, 7261 Name.Identifier, TInfo); 7262 7263 NewTD->setAccess(AS); 7264 7265 if (Invalid) 7266 NewTD->setInvalidDecl(); 7267 7268 ProcessDeclAttributeList(S, NewTD, AttrList); 7269 7270 CheckTypedefForVariablyModifiedType(S, NewTD); 7271 Invalid |= NewTD->isInvalidDecl(); 7272 7273 bool Redeclaration = false; 7274 7275 NamedDecl *NewND; 7276 if (TemplateParamLists.size()) { 7277 TypeAliasTemplateDecl *OldDecl = 0; 7278 TemplateParameterList *OldTemplateParams = 0; 7279 7280 if (TemplateParamLists.size() != 1) { 7281 Diag(UsingLoc, diag::err_alias_template_extra_headers) 7282 << SourceRange(TemplateParamLists[1]->getTemplateLoc(), 7283 TemplateParamLists[TemplateParamLists.size()-1]->getRAngleLoc()); 7284 } 7285 TemplateParameterList *TemplateParams = TemplateParamLists[0]; 7286 7287 // Only consider previous declarations in the same scope. 7288 FilterLookupForScope(Previous, CurContext, S, /*ConsiderLinkage*/false, 7289 /*ExplicitInstantiationOrSpecialization*/false); 7290 if (!Previous.empty()) { 7291 Redeclaration = true; 7292 7293 OldDecl = Previous.getAsSingle<TypeAliasTemplateDecl>(); 7294 if (!OldDecl && !Invalid) { 7295 Diag(UsingLoc, diag::err_redefinition_different_kind) 7296 << Name.Identifier; 7297 7298 NamedDecl *OldD = Previous.getRepresentativeDecl(); 7299 if (OldD->getLocation().isValid()) 7300 Diag(OldD->getLocation(), diag::note_previous_definition); 7301 7302 Invalid = true; 7303 } 7304 7305 if (!Invalid && OldDecl && !OldDecl->isInvalidDecl()) { 7306 if (TemplateParameterListsAreEqual(TemplateParams, 7307 OldDecl->getTemplateParameters(), 7308 /*Complain=*/true, 7309 TPL_TemplateMatch)) 7310 OldTemplateParams = OldDecl->getTemplateParameters(); 7311 else 7312 Invalid = true; 7313 7314 TypeAliasDecl *OldTD = OldDecl->getTemplatedDecl(); 7315 if (!Invalid && 7316 !Context.hasSameType(OldTD->getUnderlyingType(), 7317 NewTD->getUnderlyingType())) { 7318 // FIXME: The C++0x standard does not clearly say this is ill-formed, 7319 // but we can't reasonably accept it. 7320 Diag(NewTD->getLocation(), diag::err_redefinition_different_typedef) 7321 << 2 << NewTD->getUnderlyingType() << OldTD->getUnderlyingType(); 7322 if (OldTD->getLocation().isValid()) 7323 Diag(OldTD->getLocation(), diag::note_previous_definition); 7324 Invalid = true; 7325 } 7326 } 7327 } 7328 7329 // Merge any previous default template arguments into our parameters, 7330 // and check the parameter list. 7331 if (CheckTemplateParameterList(TemplateParams, OldTemplateParams, 7332 TPC_TypeAliasTemplate)) 7333 return 0; 7334 7335 TypeAliasTemplateDecl *NewDecl = 7336 TypeAliasTemplateDecl::Create(Context, CurContext, UsingLoc, 7337 Name.Identifier, TemplateParams, 7338 NewTD); 7339 7340 NewDecl->setAccess(AS); 7341 7342 if (Invalid) 7343 NewDecl->setInvalidDecl(); 7344 else if (OldDecl) 7345 NewDecl->setPreviousDeclaration(OldDecl); 7346 7347 NewND = NewDecl; 7348 } else { 7349 ActOnTypedefNameDecl(S, CurContext, NewTD, Previous, Redeclaration); 7350 NewND = NewTD; 7351 } 7352 7353 if (!Redeclaration) 7354 PushOnScopeChains(NewND, S); 7355 7356 ActOnDocumentableDecl(NewND); 7357 return NewND; 7358} 7359 7360Decl *Sema::ActOnNamespaceAliasDef(Scope *S, 7361 SourceLocation NamespaceLoc, 7362 SourceLocation AliasLoc, 7363 IdentifierInfo *Alias, 7364 CXXScopeSpec &SS, 7365 SourceLocation IdentLoc, 7366 IdentifierInfo *Ident) { 7367 7368 // Lookup the namespace name. 7369 LookupResult R(*this, Ident, IdentLoc, LookupNamespaceName); 7370 LookupParsedName(R, S, &SS); 7371 7372 // Check if we have a previous declaration with the same name. 7373 NamedDecl *PrevDecl 7374 = LookupSingleName(S, Alias, AliasLoc, LookupOrdinaryName, 7375 ForRedeclaration); 7376 if (PrevDecl && !isDeclInScope(PrevDecl, CurContext, S)) 7377 PrevDecl = 0; 7378 7379 if (PrevDecl) { 7380 if (NamespaceAliasDecl *AD = dyn_cast<NamespaceAliasDecl>(PrevDecl)) { 7381 // We already have an alias with the same name that points to the same 7382 // namespace, so don't create a new one. 7383 // FIXME: At some point, we'll want to create the (redundant) 7384 // declaration to maintain better source information. 7385 if (!R.isAmbiguous() && !R.empty() && 7386 AD->getNamespace()->Equals(getNamespaceDecl(R.getFoundDecl()))) 7387 return 0; 7388 } 7389 7390 unsigned DiagID = isa<NamespaceDecl>(PrevDecl) ? diag::err_redefinition : 7391 diag::err_redefinition_different_kind; 7392 Diag(AliasLoc, DiagID) << Alias; 7393 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7394 return 0; 7395 } 7396 7397 if (R.isAmbiguous()) 7398 return 0; 7399 7400 if (R.empty()) { 7401 if (!TryNamespaceTypoCorrection(*this, R, S, SS, IdentLoc, Ident)) { 7402 Diag(IdentLoc, diag::err_expected_namespace_name) << SS.getRange(); 7403 return 0; 7404 } 7405 } 7406 7407 NamespaceAliasDecl *AliasDecl = 7408 NamespaceAliasDecl::Create(Context, CurContext, NamespaceLoc, AliasLoc, 7409 Alias, SS.getWithLocInContext(Context), 7410 IdentLoc, R.getFoundDecl()); 7411 7412 PushOnScopeChains(AliasDecl, S); 7413 return AliasDecl; 7414} 7415 7416Sema::ImplicitExceptionSpecification 7417Sema::ComputeDefaultedDefaultCtorExceptionSpec(SourceLocation Loc, 7418 CXXMethodDecl *MD) { 7419 CXXRecordDecl *ClassDecl = MD->getParent(); 7420 7421 // C++ [except.spec]p14: 7422 // An implicitly declared special member function (Clause 12) shall have an 7423 // exception-specification. [...] 7424 ImplicitExceptionSpecification ExceptSpec(*this); 7425 if (ClassDecl->isInvalidDecl()) 7426 return ExceptSpec; 7427 7428 // Direct base-class constructors. 7429 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7430 BEnd = ClassDecl->bases_end(); 7431 B != BEnd; ++B) { 7432 if (B->isVirtual()) // Handled below. 7433 continue; 7434 7435 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7436 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7437 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7438 // If this is a deleted function, add it anyway. This might be conformant 7439 // with the standard. This might not. I'm not sure. It might not matter. 7440 if (Constructor) 7441 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7442 } 7443 } 7444 7445 // Virtual base-class constructors. 7446 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7447 BEnd = ClassDecl->vbases_end(); 7448 B != BEnd; ++B) { 7449 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 7450 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 7451 CXXConstructorDecl *Constructor = LookupDefaultConstructor(BaseClassDecl); 7452 // If this is a deleted function, add it anyway. This might be conformant 7453 // with the standard. This might not. I'm not sure. It might not matter. 7454 if (Constructor) 7455 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 7456 } 7457 } 7458 7459 // Field constructors. 7460 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7461 FEnd = ClassDecl->field_end(); 7462 F != FEnd; ++F) { 7463 if (F->hasInClassInitializer()) { 7464 if (Expr *E = F->getInClassInitializer()) 7465 ExceptSpec.CalledExpr(E); 7466 else if (!F->isInvalidDecl()) 7467 // DR1351: 7468 // If the brace-or-equal-initializer of a non-static data member 7469 // invokes a defaulted default constructor of its class or of an 7470 // enclosing class in a potentially evaluated subexpression, the 7471 // program is ill-formed. 7472 // 7473 // This resolution is unworkable: the exception specification of the 7474 // default constructor can be needed in an unevaluated context, in 7475 // particular, in the operand of a noexcept-expression, and we can be 7476 // unable to compute an exception specification for an enclosed class. 7477 // 7478 // We do not allow an in-class initializer to require the evaluation 7479 // of the exception specification for any in-class initializer whose 7480 // definition is not lexically complete. 7481 Diag(Loc, diag::err_in_class_initializer_references_def_ctor) << MD; 7482 } else if (const RecordType *RecordTy 7483 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) { 7484 CXXRecordDecl *FieldRecDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 7485 CXXConstructorDecl *Constructor = LookupDefaultConstructor(FieldRecDecl); 7486 // If this is a deleted function, add it anyway. This might be conformant 7487 // with the standard. This might not. I'm not sure. It might not matter. 7488 // In particular, the problem is that this function never gets called. It 7489 // might just be ill-formed because this function attempts to refer to 7490 // a deleted function here. 7491 if (Constructor) 7492 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 7493 } 7494 } 7495 7496 return ExceptSpec; 7497} 7498 7499Sema::ImplicitExceptionSpecification 7500Sema::ComputeInheritingCtorExceptionSpec(CXXMethodDecl *MD) { 7501 ImplicitExceptionSpecification ExceptSpec(*this); 7502 // FIXME: Compute the exception spec. 7503 return ExceptSpec; 7504} 7505 7506namespace { 7507/// RAII object to register a special member as being currently declared. 7508struct DeclaringSpecialMember { 7509 Sema &S; 7510 Sema::SpecialMemberDecl D; 7511 bool WasAlreadyBeingDeclared; 7512 7513 DeclaringSpecialMember(Sema &S, CXXRecordDecl *RD, Sema::CXXSpecialMember CSM) 7514 : S(S), D(RD, CSM) { 7515 WasAlreadyBeingDeclared = !S.SpecialMembersBeingDeclared.insert(D); 7516 if (WasAlreadyBeingDeclared) 7517 // This almost never happens, but if it does, ensure that our cache 7518 // doesn't contain a stale result. 7519 S.SpecialMemberCache.clear(); 7520 7521 // FIXME: Register a note to be produced if we encounter an error while 7522 // declaring the special member. 7523 } 7524 ~DeclaringSpecialMember() { 7525 if (!WasAlreadyBeingDeclared) 7526 S.SpecialMembersBeingDeclared.erase(D); 7527 } 7528 7529 /// \brief Are we already trying to declare this special member? 7530 bool isAlreadyBeingDeclared() const { 7531 return WasAlreadyBeingDeclared; 7532 } 7533}; 7534} 7535 7536CXXConstructorDecl *Sema::DeclareImplicitDefaultConstructor( 7537 CXXRecordDecl *ClassDecl) { 7538 // C++ [class.ctor]p5: 7539 // A default constructor for a class X is a constructor of class X 7540 // that can be called without an argument. If there is no 7541 // user-declared constructor for class X, a default constructor is 7542 // implicitly declared. An implicitly-declared default constructor 7543 // is an inline public member of its class. 7544 assert(ClassDecl->needsImplicitDefaultConstructor() && 7545 "Should not build implicit default constructor!"); 7546 7547 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDefaultConstructor); 7548 if (DSM.isAlreadyBeingDeclared()) 7549 return 0; 7550 7551 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 7552 CXXDefaultConstructor, 7553 false); 7554 7555 // Create the actual constructor declaration. 7556 CanQualType ClassType 7557 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7558 SourceLocation ClassLoc = ClassDecl->getLocation(); 7559 DeclarationName Name 7560 = Context.DeclarationNames.getCXXConstructorName(ClassType); 7561 DeclarationNameInfo NameInfo(Name, ClassLoc); 7562 CXXConstructorDecl *DefaultCon = CXXConstructorDecl::Create( 7563 Context, ClassDecl, ClassLoc, NameInfo, /*Type*/QualType(), /*TInfo=*/0, 7564 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 7565 Constexpr); 7566 DefaultCon->setAccess(AS_public); 7567 DefaultCon->setDefaulted(); 7568 DefaultCon->setImplicit(); 7569 7570 // Build an exception specification pointing back at this constructor. 7571 FunctionProtoType::ExtProtoInfo EPI; 7572 EPI.ExceptionSpecType = EST_Unevaluated; 7573 EPI.ExceptionSpecDecl = DefaultCon; 7574 DefaultCon->setType(Context.getFunctionType(Context.VoidTy, 7575 ArrayRef<QualType>(), 7576 EPI)); 7577 7578 // We don't need to use SpecialMemberIsTrivial here; triviality for default 7579 // constructors is easy to compute. 7580 DefaultCon->setTrivial(ClassDecl->hasTrivialDefaultConstructor()); 7581 7582 if (ShouldDeleteSpecialMember(DefaultCon, CXXDefaultConstructor)) 7583 DefaultCon->setDeletedAsWritten(); 7584 7585 // Note that we have declared this constructor. 7586 ++ASTContext::NumImplicitDefaultConstructorsDeclared; 7587 7588 if (Scope *S = getScopeForContext(ClassDecl)) 7589 PushOnScopeChains(DefaultCon, S, false); 7590 ClassDecl->addDecl(DefaultCon); 7591 7592 return DefaultCon; 7593} 7594 7595void Sema::DefineImplicitDefaultConstructor(SourceLocation CurrentLocation, 7596 CXXConstructorDecl *Constructor) { 7597 assert((Constructor->isDefaulted() && Constructor->isDefaultConstructor() && 7598 !Constructor->doesThisDeclarationHaveABody() && 7599 !Constructor->isDeleted()) && 7600 "DefineImplicitDefaultConstructor - call it for implicit default ctor"); 7601 7602 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7603 assert(ClassDecl && "DefineImplicitDefaultConstructor - invalid constructor"); 7604 7605 SynthesizedFunctionScope Scope(*this, Constructor); 7606 DiagnosticErrorTrap Trap(Diags); 7607 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7608 Trap.hasErrorOccurred()) { 7609 Diag(CurrentLocation, diag::note_member_synthesized_at) 7610 << CXXDefaultConstructor << Context.getTagDeclType(ClassDecl); 7611 Constructor->setInvalidDecl(); 7612 return; 7613 } 7614 7615 SourceLocation Loc = Constructor->getLocation(); 7616 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7617 7618 Constructor->setUsed(); 7619 MarkVTableUsed(CurrentLocation, ClassDecl); 7620 7621 if (ASTMutationListener *L = getASTMutationListener()) { 7622 L->CompletedImplicitDefinition(Constructor); 7623 } 7624} 7625 7626void Sema::ActOnFinishDelayedMemberInitializers(Decl *D) { 7627 // Check that any explicitly-defaulted methods have exception specifications 7628 // compatible with their implicit exception specifications. 7629 CheckDelayedExplicitlyDefaultedMemberExceptionSpecs(); 7630} 7631 7632void Sema::DeclareInheritingConstructors(CXXRecordDecl *ClassDecl) { 7633 // We start with an initial pass over the base classes to collect those that 7634 // inherit constructors from. If there are none, we can forgo all further 7635 // processing. 7636 typedef SmallVector<const RecordType *, 4> BasesVector; 7637 BasesVector BasesToInheritFrom; 7638 for (CXXRecordDecl::base_class_iterator BaseIt = ClassDecl->bases_begin(), 7639 BaseE = ClassDecl->bases_end(); 7640 BaseIt != BaseE; ++BaseIt) { 7641 if (BaseIt->getInheritConstructors()) { 7642 QualType Base = BaseIt->getType(); 7643 if (Base->isDependentType()) { 7644 // If we inherit constructors from anything that is dependent, just 7645 // abort processing altogether. We'll get another chance for the 7646 // instantiations. 7647 // FIXME: We need to ensure that any call to a constructor of this class 7648 // is considered instantiation-dependent in this case. 7649 return; 7650 } 7651 BasesToInheritFrom.push_back(Base->castAs<RecordType>()); 7652 } 7653 } 7654 if (BasesToInheritFrom.empty()) 7655 return; 7656 7657 // FIXME: Constructor templates. 7658 7659 // Now collect the constructors that we already have in the current class. 7660 // Those take precedence over inherited constructors. 7661 // C++11 [class.inhctor]p3: [...] a constructor is implicitly declared [...] 7662 // unless there is a user-declared constructor with the same signature in 7663 // the class where the using-declaration appears. 7664 llvm::SmallSet<const Type *, 8> ExistingConstructors; 7665 for (CXXRecordDecl::ctor_iterator CtorIt = ClassDecl->ctor_begin(), 7666 CtorE = ClassDecl->ctor_end(); 7667 CtorIt != CtorE; ++CtorIt) 7668 ExistingConstructors.insert( 7669 Context.getCanonicalType(CtorIt->getType()).getTypePtr()); 7670 7671 DeclarationName CreatedCtorName = 7672 Context.DeclarationNames.getCXXConstructorName( 7673 ClassDecl->getTypeForDecl()->getCanonicalTypeUnqualified()); 7674 7675 // Now comes the true work. 7676 // First, we keep a map from constructor types to the base that introduced 7677 // them. Needed for finding conflicting constructors. We also keep the 7678 // actually inserted declarations in there, for pretty diagnostics. 7679 typedef std::pair<CanQualType, CXXConstructorDecl *> ConstructorInfo; 7680 typedef llvm::DenseMap<const Type *, ConstructorInfo> ConstructorToSourceMap; 7681 ConstructorToSourceMap InheritedConstructors; 7682 for (BasesVector::iterator BaseIt = BasesToInheritFrom.begin(), 7683 BaseE = BasesToInheritFrom.end(); 7684 BaseIt != BaseE; ++BaseIt) { 7685 const RecordType *Base = *BaseIt; 7686 CanQualType CanonicalBase = Base->getCanonicalTypeUnqualified(); 7687 CXXRecordDecl *BaseDecl = cast<CXXRecordDecl>(Base->getDecl()); 7688 for (CXXRecordDecl::ctor_iterator CtorIt = BaseDecl->ctor_begin(), 7689 CtorE = BaseDecl->ctor_end(); 7690 CtorIt != CtorE; ++CtorIt) { 7691 // Find the using declaration for inheriting this base's constructors. 7692 // FIXME: Don't perform name lookup just to obtain a source location! 7693 DeclarationName Name = 7694 Context.DeclarationNames.getCXXConstructorName(CanonicalBase); 7695 LookupResult Result(*this, Name, SourceLocation(), LookupUsingDeclName); 7696 LookupQualifiedName(Result, CurContext); 7697 UsingDecl *UD = Result.getAsSingle<UsingDecl>(); 7698 SourceLocation UsingLoc = UD ? UD->getLocation() : 7699 ClassDecl->getLocation(); 7700 7701 // C++11 [class.inhctor]p1: 7702 // The candidate set of inherited constructors from the class X named in 7703 // the using-declaration consists of actual constructors and notional 7704 // constructors that result from the transformation of defaulted 7705 // parameters as follows: 7706 // - all non-template constructors of X, and 7707 // - for each non-template constructor of X that has at least one 7708 // parameter with a default argument, the set of constructors that 7709 // results from omitting any ellipsis parameter specification and 7710 // successively omitting parameters with a default argument from the 7711 // end of the parameter-type-list, and 7712 // FIXME: ...also constructor templates. 7713 CXXConstructorDecl *BaseCtor = *CtorIt; 7714 bool CanBeCopyOrMove = BaseCtor->isCopyOrMoveConstructor(); 7715 const FunctionProtoType *BaseCtorType = 7716 BaseCtor->getType()->getAs<FunctionProtoType>(); 7717 7718 // Determine whether this would be a copy or move constructor for the 7719 // derived class. 7720 if (BaseCtorType->getNumArgs() >= 1 && 7721 BaseCtorType->getArgType(0)->isReferenceType() && 7722 Context.hasSameUnqualifiedType( 7723 BaseCtorType->getArgType(0)->getPointeeType(), 7724 Context.getTagDeclType(ClassDecl))) 7725 CanBeCopyOrMove = true; 7726 7727 ArrayRef<QualType> ArgTypes(BaseCtorType->getArgTypes()); 7728 FunctionProtoType::ExtProtoInfo EPI = BaseCtorType->getExtProtoInfo(); 7729 // Core issue (no number yet): the ellipsis is always discarded. 7730 if (EPI.Variadic) { 7731 Diag(UsingLoc, diag::warn_using_decl_constructor_ellipsis); 7732 Diag(BaseCtor->getLocation(), 7733 diag::note_using_decl_constructor_ellipsis); 7734 EPI.Variadic = false; 7735 } 7736 7737 for (unsigned Params = BaseCtor->getMinRequiredArguments(), 7738 MaxParams = BaseCtor->getNumParams(); 7739 Params <= MaxParams; ++Params) { 7740 // Skip default constructors. They're never inherited. 7741 if (Params == 0) 7742 continue; 7743 7744 // Skip copy and move constructors for both base and derived class 7745 // for the same reason. 7746 if (CanBeCopyOrMove && Params == 1) 7747 continue; 7748 7749 // Build up a function type for this particular constructor. 7750 QualType NewCtorType = 7751 Context.getFunctionType(Context.VoidTy, ArgTypes.slice(0, Params), 7752 EPI); 7753 const Type *CanonicalNewCtorType = 7754 Context.getCanonicalType(NewCtorType).getTypePtr(); 7755 7756 // C++11 [class.inhctor]p3: 7757 // ... a constructor is implicitly declared with the same constructor 7758 // characteristics unless there is a user-declared constructor with 7759 // the same signature in the class where the using-declaration appears 7760 if (ExistingConstructors.count(CanonicalNewCtorType)) 7761 continue; 7762 7763 // C++11 [class.inhctor]p7: 7764 // If two using-declarations declare inheriting constructors with the 7765 // same signature, the program is ill-formed 7766 std::pair<ConstructorToSourceMap::iterator, bool> result = 7767 InheritedConstructors.insert(std::make_pair( 7768 CanonicalNewCtorType, 7769 std::make_pair(CanonicalBase, (CXXConstructorDecl*)0))); 7770 if (!result.second) { 7771 // Already in the map. If it came from a different class, that's an 7772 // error. Not if it's from the same. 7773 CanQualType PreviousBase = result.first->second.first; 7774 if (CanonicalBase != PreviousBase) { 7775 const CXXConstructorDecl *PrevCtor = result.first->second.second; 7776 const CXXConstructorDecl *PrevBaseCtor = 7777 PrevCtor->getInheritedConstructor(); 7778 assert(PrevBaseCtor && "Conflicting constructor was not inherited"); 7779 7780 Diag(UsingLoc, diag::err_using_decl_constructor_conflict); 7781 Diag(BaseCtor->getLocation(), 7782 diag::note_using_decl_constructor_conflict_current_ctor); 7783 Diag(PrevBaseCtor->getLocation(), 7784 diag::note_using_decl_constructor_conflict_previous_ctor); 7785 Diag(PrevCtor->getLocation(), 7786 diag::note_using_decl_constructor_conflict_previous_using); 7787 } else { 7788 // Core issue (no number): if the same inheriting constructor is 7789 // produced by multiple base class constructors from the same base 7790 // class, the inheriting constructor is defined as deleted. 7791 result.first->second.second->setDeletedAsWritten(); 7792 } 7793 continue; 7794 } 7795 7796 // OK, we're there, now add the constructor. 7797 DeclarationNameInfo DNI(CreatedCtorName, UsingLoc); 7798 CXXConstructorDecl *NewCtor = CXXConstructorDecl::Create( 7799 Context, ClassDecl, UsingLoc, DNI, NewCtorType, 7800 /*TInfo=*/0, BaseCtor->isExplicit(), /*Inline=*/true, 7801 /*ImplicitlyDeclared=*/true, /*Constexpr=*/BaseCtor->isConstexpr()); 7802 NewCtor->setAccess(BaseCtor->getAccess()); 7803 7804 // Build an unevaluated exception specification for this constructor. 7805 EPI.ExceptionSpecType = EST_Unevaluated; 7806 EPI.ExceptionSpecDecl = NewCtor; 7807 NewCtor->setType(Context.getFunctionType(Context.VoidTy, 7808 ArgTypes.slice(0, Params), 7809 EPI)); 7810 7811 // Build up the parameter decls and add them. 7812 SmallVector<ParmVarDecl *, 16> ParamDecls; 7813 for (unsigned i = 0; i < Params; ++i) { 7814 ParmVarDecl *PD = ParmVarDecl::Create(Context, NewCtor, 7815 UsingLoc, UsingLoc, 7816 /*IdentifierInfo=*/0, 7817 BaseCtorType->getArgType(i), 7818 /*TInfo=*/0, SC_None, 7819 SC_None, /*DefaultArg=*/0); 7820 PD->setScopeInfo(0, i); 7821 PD->setImplicit(); 7822 ParamDecls.push_back(PD); 7823 } 7824 NewCtor->setParams(ParamDecls); 7825 NewCtor->setInheritedConstructor(BaseCtor); 7826 if (BaseCtor->isDeleted()) 7827 NewCtor->setDeletedAsWritten(); 7828 7829 ClassDecl->addDecl(NewCtor); 7830 result.first->second.second = NewCtor; 7831 } 7832 } 7833 } 7834} 7835 7836void Sema::DefineInheritingConstructor(SourceLocation CurrentLocation, 7837 CXXConstructorDecl *Constructor) { 7838 CXXRecordDecl *ClassDecl = Constructor->getParent(); 7839 assert(Constructor->getInheritedConstructor() && 7840 !Constructor->doesThisDeclarationHaveABody() && 7841 !Constructor->isDeleted()); 7842 7843 SynthesizedFunctionScope Scope(*this, Constructor); 7844 DiagnosticErrorTrap Trap(Diags); 7845 if (SetCtorInitializers(Constructor, /*AnyErrors=*/false) || 7846 Trap.hasErrorOccurred()) { 7847 Diag(CurrentLocation, diag::note_inhctor_synthesized_at) 7848 << Context.getTagDeclType(ClassDecl); 7849 Constructor->setInvalidDecl(); 7850 return; 7851 } 7852 7853 SourceLocation Loc = Constructor->getLocation(); 7854 Constructor->setBody(new (Context) CompoundStmt(Loc)); 7855 7856 Constructor->setUsed(); 7857 MarkVTableUsed(CurrentLocation, ClassDecl); 7858 7859 if (ASTMutationListener *L = getASTMutationListener()) { 7860 L->CompletedImplicitDefinition(Constructor); 7861 } 7862} 7863 7864 7865Sema::ImplicitExceptionSpecification 7866Sema::ComputeDefaultedDtorExceptionSpec(CXXMethodDecl *MD) { 7867 CXXRecordDecl *ClassDecl = MD->getParent(); 7868 7869 // C++ [except.spec]p14: 7870 // An implicitly declared special member function (Clause 12) shall have 7871 // an exception-specification. 7872 ImplicitExceptionSpecification ExceptSpec(*this); 7873 if (ClassDecl->isInvalidDecl()) 7874 return ExceptSpec; 7875 7876 // Direct base-class destructors. 7877 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 7878 BEnd = ClassDecl->bases_end(); 7879 B != BEnd; ++B) { 7880 if (B->isVirtual()) // Handled below. 7881 continue; 7882 7883 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7884 ExceptSpec.CalledDecl(B->getLocStart(), 7885 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7886 } 7887 7888 // Virtual base-class destructors. 7889 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 7890 BEnd = ClassDecl->vbases_end(); 7891 B != BEnd; ++B) { 7892 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) 7893 ExceptSpec.CalledDecl(B->getLocStart(), 7894 LookupDestructor(cast<CXXRecordDecl>(BaseType->getDecl()))); 7895 } 7896 7897 // Field destructors. 7898 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 7899 FEnd = ClassDecl->field_end(); 7900 F != FEnd; ++F) { 7901 if (const RecordType *RecordTy 7902 = Context.getBaseElementType(F->getType())->getAs<RecordType>()) 7903 ExceptSpec.CalledDecl(F->getLocation(), 7904 LookupDestructor(cast<CXXRecordDecl>(RecordTy->getDecl()))); 7905 } 7906 7907 return ExceptSpec; 7908} 7909 7910CXXDestructorDecl *Sema::DeclareImplicitDestructor(CXXRecordDecl *ClassDecl) { 7911 // C++ [class.dtor]p2: 7912 // If a class has no user-declared destructor, a destructor is 7913 // declared implicitly. An implicitly-declared destructor is an 7914 // inline public member of its class. 7915 assert(ClassDecl->needsImplicitDestructor()); 7916 7917 DeclaringSpecialMember DSM(*this, ClassDecl, CXXDestructor); 7918 if (DSM.isAlreadyBeingDeclared()) 7919 return 0; 7920 7921 // Create the actual destructor declaration. 7922 CanQualType ClassType 7923 = Context.getCanonicalType(Context.getTypeDeclType(ClassDecl)); 7924 SourceLocation ClassLoc = ClassDecl->getLocation(); 7925 DeclarationName Name 7926 = Context.DeclarationNames.getCXXDestructorName(ClassType); 7927 DeclarationNameInfo NameInfo(Name, ClassLoc); 7928 CXXDestructorDecl *Destructor 7929 = CXXDestructorDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, 7930 QualType(), 0, /*isInline=*/true, 7931 /*isImplicitlyDeclared=*/true); 7932 Destructor->setAccess(AS_public); 7933 Destructor->setDefaulted(); 7934 Destructor->setImplicit(); 7935 7936 // Build an exception specification pointing back at this destructor. 7937 FunctionProtoType::ExtProtoInfo EPI; 7938 EPI.ExceptionSpecType = EST_Unevaluated; 7939 EPI.ExceptionSpecDecl = Destructor; 7940 Destructor->setType(Context.getFunctionType(Context.VoidTy, 7941 ArrayRef<QualType>(), 7942 EPI)); 7943 7944 AddOverriddenMethods(ClassDecl, Destructor); 7945 7946 // We don't need to use SpecialMemberIsTrivial here; triviality for 7947 // destructors is easy to compute. 7948 Destructor->setTrivial(ClassDecl->hasTrivialDestructor()); 7949 7950 if (ShouldDeleteSpecialMember(Destructor, CXXDestructor)) 7951 Destructor->setDeletedAsWritten(); 7952 7953 // Note that we have declared this destructor. 7954 ++ASTContext::NumImplicitDestructorsDeclared; 7955 7956 // Introduce this destructor into its scope. 7957 if (Scope *S = getScopeForContext(ClassDecl)) 7958 PushOnScopeChains(Destructor, S, false); 7959 ClassDecl->addDecl(Destructor); 7960 7961 return Destructor; 7962} 7963 7964void Sema::DefineImplicitDestructor(SourceLocation CurrentLocation, 7965 CXXDestructorDecl *Destructor) { 7966 assert((Destructor->isDefaulted() && 7967 !Destructor->doesThisDeclarationHaveABody() && 7968 !Destructor->isDeleted()) && 7969 "DefineImplicitDestructor - call it for implicit default dtor"); 7970 CXXRecordDecl *ClassDecl = Destructor->getParent(); 7971 assert(ClassDecl && "DefineImplicitDestructor - invalid destructor"); 7972 7973 if (Destructor->isInvalidDecl()) 7974 return; 7975 7976 SynthesizedFunctionScope Scope(*this, Destructor); 7977 7978 DiagnosticErrorTrap Trap(Diags); 7979 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7980 Destructor->getParent()); 7981 7982 if (CheckDestructor(Destructor) || Trap.hasErrorOccurred()) { 7983 Diag(CurrentLocation, diag::note_member_synthesized_at) 7984 << CXXDestructor << Context.getTagDeclType(ClassDecl); 7985 7986 Destructor->setInvalidDecl(); 7987 return; 7988 } 7989 7990 SourceLocation Loc = Destructor->getLocation(); 7991 Destructor->setBody(new (Context) CompoundStmt(Loc)); 7992 Destructor->setImplicitlyDefined(true); 7993 Destructor->setUsed(); 7994 MarkVTableUsed(CurrentLocation, ClassDecl); 7995 7996 if (ASTMutationListener *L = getASTMutationListener()) { 7997 L->CompletedImplicitDefinition(Destructor); 7998 } 7999} 8000 8001/// \brief Perform any semantic analysis which needs to be delayed until all 8002/// pending class member declarations have been parsed. 8003void Sema::ActOnFinishCXXMemberDecls() { 8004 // If the context is an invalid C++ class, just suppress these checks. 8005 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(CurContext)) { 8006 if (Record->isInvalidDecl()) { 8007 DelayedDestructorExceptionSpecChecks.clear(); 8008 return; 8009 } 8010 } 8011 8012 // Perform any deferred checking of exception specifications for virtual 8013 // destructors. 8014 for (unsigned i = 0, e = DelayedDestructorExceptionSpecChecks.size(); 8015 i != e; ++i) { 8016 const CXXDestructorDecl *Dtor = 8017 DelayedDestructorExceptionSpecChecks[i].first; 8018 assert(!Dtor->getParent()->isDependentType() && 8019 "Should not ever add destructors of templates into the list."); 8020 CheckOverridingFunctionExceptionSpec(Dtor, 8021 DelayedDestructorExceptionSpecChecks[i].second); 8022 } 8023 DelayedDestructorExceptionSpecChecks.clear(); 8024} 8025 8026void Sema::AdjustDestructorExceptionSpec(CXXRecordDecl *ClassDecl, 8027 CXXDestructorDecl *Destructor) { 8028 assert(getLangOpts().CPlusPlus11 && 8029 "adjusting dtor exception specs was introduced in c++11"); 8030 8031 // C++11 [class.dtor]p3: 8032 // A declaration of a destructor that does not have an exception- 8033 // specification is implicitly considered to have the same exception- 8034 // specification as an implicit declaration. 8035 const FunctionProtoType *DtorType = Destructor->getType()-> 8036 getAs<FunctionProtoType>(); 8037 if (DtorType->hasExceptionSpec()) 8038 return; 8039 8040 // Replace the destructor's type, building off the existing one. Fortunately, 8041 // the only thing of interest in the destructor type is its extended info. 8042 // The return and arguments are fixed. 8043 FunctionProtoType::ExtProtoInfo EPI = DtorType->getExtProtoInfo(); 8044 EPI.ExceptionSpecType = EST_Unevaluated; 8045 EPI.ExceptionSpecDecl = Destructor; 8046 Destructor->setType(Context.getFunctionType(Context.VoidTy, 8047 ArrayRef<QualType>(), 8048 EPI)); 8049 8050 // FIXME: If the destructor has a body that could throw, and the newly created 8051 // spec doesn't allow exceptions, we should emit a warning, because this 8052 // change in behavior can break conforming C++03 programs at runtime. 8053 // However, we don't have a body or an exception specification yet, so it 8054 // needs to be done somewhere else. 8055} 8056 8057/// When generating a defaulted copy or move assignment operator, if a field 8058/// should be copied with __builtin_memcpy rather than via explicit assignments, 8059/// do so. This optimization only applies for arrays of scalars, and for arrays 8060/// of class type where the selected copy/move-assignment operator is trivial. 8061static StmtResult 8062buildMemcpyForAssignmentOp(Sema &S, SourceLocation Loc, QualType T, 8063 Expr *To, Expr *From) { 8064 // Compute the size of the memory buffer to be copied. 8065 QualType SizeType = S.Context.getSizeType(); 8066 llvm::APInt Size(S.Context.getTypeSize(SizeType), 8067 S.Context.getTypeSizeInChars(T).getQuantity()); 8068 8069 // Take the address of the field references for "from" and "to". We 8070 // directly construct UnaryOperators here because semantic analysis 8071 // does not permit us to take the address of an xvalue. 8072 From = new (S.Context) UnaryOperator(From, UO_AddrOf, 8073 S.Context.getPointerType(From->getType()), 8074 VK_RValue, OK_Ordinary, Loc); 8075 To = new (S.Context) UnaryOperator(To, UO_AddrOf, 8076 S.Context.getPointerType(To->getType()), 8077 VK_RValue, OK_Ordinary, Loc); 8078 8079 const Type *E = T->getBaseElementTypeUnsafe(); 8080 bool NeedsCollectableMemCpy = 8081 E->isRecordType() && E->getAs<RecordType>()->getDecl()->hasObjectMember(); 8082 8083 // Create a reference to the __builtin_objc_memmove_collectable function 8084 StringRef MemCpyName = NeedsCollectableMemCpy ? 8085 "__builtin_objc_memmove_collectable" : 8086 "__builtin_memcpy"; 8087 LookupResult R(S, &S.Context.Idents.get(MemCpyName), Loc, 8088 Sema::LookupOrdinaryName); 8089 S.LookupName(R, S.TUScope, true); 8090 8091 FunctionDecl *MemCpy = R.getAsSingle<FunctionDecl>(); 8092 if (!MemCpy) 8093 // Something went horribly wrong earlier, and we will have complained 8094 // about it. 8095 return StmtError(); 8096 8097 ExprResult MemCpyRef = S.BuildDeclRefExpr(MemCpy, S.Context.BuiltinFnTy, 8098 VK_RValue, Loc, 0); 8099 assert(MemCpyRef.isUsable() && "Builtin reference cannot fail"); 8100 8101 Expr *CallArgs[] = { 8102 To, From, IntegerLiteral::Create(S.Context, Size, SizeType, Loc) 8103 }; 8104 ExprResult Call = S.ActOnCallExpr(/*Scope=*/0, MemCpyRef.take(), 8105 Loc, CallArgs, Loc); 8106 8107 assert(!Call.isInvalid() && "Call to __builtin_memcpy cannot fail!"); 8108 return S.Owned(Call.takeAs<Stmt>()); 8109} 8110 8111/// \brief Builds a statement that copies/moves the given entity from \p From to 8112/// \c To. 8113/// 8114/// This routine is used to copy/move the members of a class with an 8115/// implicitly-declared copy/move assignment operator. When the entities being 8116/// copied are arrays, this routine builds for loops to copy them. 8117/// 8118/// \param S The Sema object used for type-checking. 8119/// 8120/// \param Loc The location where the implicit copy/move is being generated. 8121/// 8122/// \param T The type of the expressions being copied/moved. Both expressions 8123/// must have this type. 8124/// 8125/// \param To The expression we are copying/moving to. 8126/// 8127/// \param From The expression we are copying/moving from. 8128/// 8129/// \param CopyingBaseSubobject Whether we're copying/moving a base subobject. 8130/// Otherwise, it's a non-static member subobject. 8131/// 8132/// \param Copying Whether we're copying or moving. 8133/// 8134/// \param Depth Internal parameter recording the depth of the recursion. 8135/// 8136/// \returns A statement or a loop that copies the expressions, or StmtResult(0) 8137/// if a memcpy should be used instead. 8138static StmtResult 8139buildSingleCopyAssignRecursively(Sema &S, SourceLocation Loc, QualType T, 8140 Expr *To, Expr *From, 8141 bool CopyingBaseSubobject, bool Copying, 8142 unsigned Depth = 0) { 8143 // C++11 [class.copy]p28: 8144 // Each subobject is assigned in the manner appropriate to its type: 8145 // 8146 // - if the subobject is of class type, as if by a call to operator= with 8147 // the subobject as the object expression and the corresponding 8148 // subobject of x as a single function argument (as if by explicit 8149 // qualification; that is, ignoring any possible virtual overriding 8150 // functions in more derived classes); 8151 // 8152 // C++03 [class.copy]p13: 8153 // - if the subobject is of class type, the copy assignment operator for 8154 // the class is used (as if by explicit qualification; that is, 8155 // ignoring any possible virtual overriding functions in more derived 8156 // classes); 8157 if (const RecordType *RecordTy = T->getAs<RecordType>()) { 8158 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(RecordTy->getDecl()); 8159 8160 // Look for operator=. 8161 DeclarationName Name 8162 = S.Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8163 LookupResult OpLookup(S, Name, Loc, Sema::LookupOrdinaryName); 8164 S.LookupQualifiedName(OpLookup, ClassDecl, false); 8165 8166 // Prior to C++11, filter out any result that isn't a copy/move-assignment 8167 // operator. 8168 if (!S.getLangOpts().CPlusPlus11) { 8169 LookupResult::Filter F = OpLookup.makeFilter(); 8170 while (F.hasNext()) { 8171 NamedDecl *D = F.next(); 8172 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 8173 if (Method->isCopyAssignmentOperator() || 8174 (!Copying && Method->isMoveAssignmentOperator())) 8175 continue; 8176 8177 F.erase(); 8178 } 8179 F.done(); 8180 } 8181 8182 // Suppress the protected check (C++ [class.protected]) for each of the 8183 // assignment operators we found. This strange dance is required when 8184 // we're assigning via a base classes's copy-assignment operator. To 8185 // ensure that we're getting the right base class subobject (without 8186 // ambiguities), we need to cast "this" to that subobject type; to 8187 // ensure that we don't go through the virtual call mechanism, we need 8188 // to qualify the operator= name with the base class (see below). However, 8189 // this means that if the base class has a protected copy assignment 8190 // operator, the protected member access check will fail. So, we 8191 // rewrite "protected" access to "public" access in this case, since we 8192 // know by construction that we're calling from a derived class. 8193 if (CopyingBaseSubobject) { 8194 for (LookupResult::iterator L = OpLookup.begin(), LEnd = OpLookup.end(); 8195 L != LEnd; ++L) { 8196 if (L.getAccess() == AS_protected) 8197 L.setAccess(AS_public); 8198 } 8199 } 8200 8201 // Create the nested-name-specifier that will be used to qualify the 8202 // reference to operator=; this is required to suppress the virtual 8203 // call mechanism. 8204 CXXScopeSpec SS; 8205 const Type *CanonicalT = S.Context.getCanonicalType(T.getTypePtr()); 8206 SS.MakeTrivial(S.Context, 8207 NestedNameSpecifier::Create(S.Context, 0, false, 8208 CanonicalT), 8209 Loc); 8210 8211 // Create the reference to operator=. 8212 ExprResult OpEqualRef 8213 = S.BuildMemberReferenceExpr(To, T, Loc, /*isArrow=*/false, SS, 8214 /*TemplateKWLoc=*/SourceLocation(), 8215 /*FirstQualifierInScope=*/0, 8216 OpLookup, 8217 /*TemplateArgs=*/0, 8218 /*SuppressQualifierCheck=*/true); 8219 if (OpEqualRef.isInvalid()) 8220 return StmtError(); 8221 8222 // Build the call to the assignment operator. 8223 8224 ExprResult Call = S.BuildCallToMemberFunction(/*Scope=*/0, 8225 OpEqualRef.takeAs<Expr>(), 8226 Loc, &From, 1, Loc); 8227 if (Call.isInvalid()) 8228 return StmtError(); 8229 8230 // If we built a call to a trivial 'operator=' while copying an array, 8231 // bail out. We'll replace the whole shebang with a memcpy. 8232 CXXMemberCallExpr *CE = dyn_cast<CXXMemberCallExpr>(Call.get()); 8233 if (CE && CE->getMethodDecl()->isTrivial() && Depth) 8234 return StmtResult((Stmt*)0); 8235 8236 // Convert to an expression-statement, and clean up any produced 8237 // temporaries. 8238 return S.ActOnExprStmt(Call); 8239 } 8240 8241 // - if the subobject is of scalar type, the built-in assignment 8242 // operator is used. 8243 const ConstantArrayType *ArrayTy = S.Context.getAsConstantArrayType(T); 8244 if (!ArrayTy) { 8245 ExprResult Assignment = S.CreateBuiltinBinOp(Loc, BO_Assign, To, From); 8246 if (Assignment.isInvalid()) 8247 return StmtError(); 8248 return S.ActOnExprStmt(Assignment); 8249 } 8250 8251 // - if the subobject is an array, each element is assigned, in the 8252 // manner appropriate to the element type; 8253 8254 // Construct a loop over the array bounds, e.g., 8255 // 8256 // for (__SIZE_TYPE__ i0 = 0; i0 != array-size; ++i0) 8257 // 8258 // that will copy each of the array elements. 8259 QualType SizeType = S.Context.getSizeType(); 8260 8261 // Create the iteration variable. 8262 IdentifierInfo *IterationVarName = 0; 8263 { 8264 SmallString<8> Str; 8265 llvm::raw_svector_ostream OS(Str); 8266 OS << "__i" << Depth; 8267 IterationVarName = &S.Context.Idents.get(OS.str()); 8268 } 8269 VarDecl *IterationVar = VarDecl::Create(S.Context, S.CurContext, Loc, Loc, 8270 IterationVarName, SizeType, 8271 S.Context.getTrivialTypeSourceInfo(SizeType, Loc), 8272 SC_None, SC_None); 8273 8274 // Initialize the iteration variable to zero. 8275 llvm::APInt Zero(S.Context.getTypeSize(SizeType), 0); 8276 IterationVar->setInit(IntegerLiteral::Create(S.Context, Zero, SizeType, Loc)); 8277 8278 // Create a reference to the iteration variable; we'll use this several 8279 // times throughout. 8280 Expr *IterationVarRef 8281 = S.BuildDeclRefExpr(IterationVar, SizeType, VK_LValue, Loc).take(); 8282 assert(IterationVarRef && "Reference to invented variable cannot fail!"); 8283 Expr *IterationVarRefRVal = S.DefaultLvalueConversion(IterationVarRef).take(); 8284 assert(IterationVarRefRVal && "Conversion of invented variable cannot fail!"); 8285 8286 // Create the DeclStmt that holds the iteration variable. 8287 Stmt *InitStmt = new (S.Context) DeclStmt(DeclGroupRef(IterationVar),Loc,Loc); 8288 8289 // Subscript the "from" and "to" expressions with the iteration variable. 8290 From = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(From, Loc, 8291 IterationVarRefRVal, 8292 Loc)); 8293 To = AssertSuccess(S.CreateBuiltinArraySubscriptExpr(To, Loc, 8294 IterationVarRefRVal, 8295 Loc)); 8296 if (!Copying) // Cast to rvalue 8297 From = CastForMoving(S, From); 8298 8299 // Build the copy/move for an individual element of the array. 8300 StmtResult Copy = 8301 buildSingleCopyAssignRecursively(S, Loc, ArrayTy->getElementType(), 8302 To, From, CopyingBaseSubobject, 8303 Copying, Depth + 1); 8304 // Bail out if copying fails or if we determined that we should use memcpy. 8305 if (Copy.isInvalid() || !Copy.get()) 8306 return Copy; 8307 8308 // Create the comparison against the array bound. 8309 llvm::APInt Upper 8310 = ArrayTy->getSize().zextOrTrunc(S.Context.getTypeSize(SizeType)); 8311 Expr *Comparison 8312 = new (S.Context) BinaryOperator(IterationVarRefRVal, 8313 IntegerLiteral::Create(S.Context, Upper, SizeType, Loc), 8314 BO_NE, S.Context.BoolTy, 8315 VK_RValue, OK_Ordinary, Loc, false); 8316 8317 // Create the pre-increment of the iteration variable. 8318 Expr *Increment 8319 = new (S.Context) UnaryOperator(IterationVarRef, UO_PreInc, SizeType, 8320 VK_LValue, OK_Ordinary, Loc); 8321 8322 // Construct the loop that copies all elements of this array. 8323 return S.ActOnForStmt(Loc, Loc, InitStmt, 8324 S.MakeFullExpr(Comparison), 8325 0, S.MakeFullDiscardedValueExpr(Increment), 8326 Loc, Copy.take()); 8327} 8328 8329static StmtResult 8330buildSingleCopyAssign(Sema &S, SourceLocation Loc, QualType T, 8331 Expr *To, Expr *From, 8332 bool CopyingBaseSubobject, bool Copying) { 8333 // Maybe we should use a memcpy? 8334 if (T->isArrayType() && !T.isConstQualified() && !T.isVolatileQualified() && 8335 T.isTriviallyCopyableType(S.Context)) 8336 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8337 8338 StmtResult Result(buildSingleCopyAssignRecursively(S, Loc, T, To, From, 8339 CopyingBaseSubobject, 8340 Copying, 0)); 8341 8342 // If we ended up picking a trivial assignment operator for an array of a 8343 // non-trivially-copyable class type, just emit a memcpy. 8344 if (!Result.isInvalid() && !Result.get()) 8345 return buildMemcpyForAssignmentOp(S, Loc, T, To, From); 8346 8347 return Result; 8348} 8349 8350Sema::ImplicitExceptionSpecification 8351Sema::ComputeDefaultedCopyAssignmentExceptionSpec(CXXMethodDecl *MD) { 8352 CXXRecordDecl *ClassDecl = MD->getParent(); 8353 8354 ImplicitExceptionSpecification ExceptSpec(*this); 8355 if (ClassDecl->isInvalidDecl()) 8356 return ExceptSpec; 8357 8358 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 8359 assert(T->getNumArgs() == 1 && "not a copy assignment op"); 8360 unsigned ArgQuals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 8361 8362 // C++ [except.spec]p14: 8363 // An implicitly declared special member function (Clause 12) shall have an 8364 // exception-specification. [...] 8365 8366 // It is unspecified whether or not an implicit copy assignment operator 8367 // attempts to deduplicate calls to assignment operators of virtual bases are 8368 // made. As such, this exception specification is effectively unspecified. 8369 // Based on a similar decision made for constness in C++0x, we're erring on 8370 // the side of assuming such calls to be made regardless of whether they 8371 // actually happen. 8372 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8373 BaseEnd = ClassDecl->bases_end(); 8374 Base != BaseEnd; ++Base) { 8375 if (Base->isVirtual()) 8376 continue; 8377 8378 CXXRecordDecl *BaseClassDecl 8379 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8380 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8381 ArgQuals, false, 0)) 8382 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8383 } 8384 8385 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8386 BaseEnd = ClassDecl->vbases_end(); 8387 Base != BaseEnd; ++Base) { 8388 CXXRecordDecl *BaseClassDecl 8389 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8390 if (CXXMethodDecl *CopyAssign = LookupCopyingAssignment(BaseClassDecl, 8391 ArgQuals, false, 0)) 8392 ExceptSpec.CalledDecl(Base->getLocStart(), CopyAssign); 8393 } 8394 8395 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8396 FieldEnd = ClassDecl->field_end(); 8397 Field != FieldEnd; 8398 ++Field) { 8399 QualType FieldType = Context.getBaseElementType(Field->getType()); 8400 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8401 if (CXXMethodDecl *CopyAssign = 8402 LookupCopyingAssignment(FieldClassDecl, 8403 ArgQuals | FieldType.getCVRQualifiers(), 8404 false, 0)) 8405 ExceptSpec.CalledDecl(Field->getLocation(), CopyAssign); 8406 } 8407 } 8408 8409 return ExceptSpec; 8410} 8411 8412CXXMethodDecl *Sema::DeclareImplicitCopyAssignment(CXXRecordDecl *ClassDecl) { 8413 // Note: The following rules are largely analoguous to the copy 8414 // constructor rules. Note that virtual bases are not taken into account 8415 // for determining the argument type of the operator. Note also that 8416 // operators taking an object instead of a reference are allowed. 8417 assert(ClassDecl->needsImplicitCopyAssignment()); 8418 8419 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyAssignment); 8420 if (DSM.isAlreadyBeingDeclared()) 8421 return 0; 8422 8423 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8424 QualType RetType = Context.getLValueReferenceType(ArgType); 8425 if (ClassDecl->implicitCopyAssignmentHasConstParam()) 8426 ArgType = ArgType.withConst(); 8427 ArgType = Context.getLValueReferenceType(ArgType); 8428 8429 // An implicitly-declared copy assignment operator is an inline public 8430 // member of its class. 8431 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8432 SourceLocation ClassLoc = ClassDecl->getLocation(); 8433 DeclarationNameInfo NameInfo(Name, ClassLoc); 8434 CXXMethodDecl *CopyAssignment 8435 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8436 /*TInfo=*/0, /*isStatic=*/false, 8437 /*StorageClassAsWritten=*/SC_None, 8438 /*isInline=*/true, /*isConstexpr=*/false, 8439 SourceLocation()); 8440 CopyAssignment->setAccess(AS_public); 8441 CopyAssignment->setDefaulted(); 8442 CopyAssignment->setImplicit(); 8443 8444 // Build an exception specification pointing back at this member. 8445 FunctionProtoType::ExtProtoInfo EPI; 8446 EPI.ExceptionSpecType = EST_Unevaluated; 8447 EPI.ExceptionSpecDecl = CopyAssignment; 8448 CopyAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8449 8450 // Add the parameter to the operator. 8451 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyAssignment, 8452 ClassLoc, ClassLoc, /*Id=*/0, 8453 ArgType, /*TInfo=*/0, 8454 SC_None, 8455 SC_None, 0); 8456 CopyAssignment->setParams(FromParam); 8457 8458 AddOverriddenMethods(ClassDecl, CopyAssignment); 8459 8460 CopyAssignment->setTrivial( 8461 ClassDecl->needsOverloadResolutionForCopyAssignment() 8462 ? SpecialMemberIsTrivial(CopyAssignment, CXXCopyAssignment) 8463 : ClassDecl->hasTrivialCopyAssignment()); 8464 8465 // C++0x [class.copy]p19: 8466 // .... If the class definition does not explicitly declare a copy 8467 // assignment operator, there is no user-declared move constructor, and 8468 // there is no user-declared move assignment operator, a copy assignment 8469 // operator is implicitly declared as defaulted. 8470 if (ShouldDeleteSpecialMember(CopyAssignment, CXXCopyAssignment)) 8471 CopyAssignment->setDeletedAsWritten(); 8472 8473 // Note that we have added this copy-assignment operator. 8474 ++ASTContext::NumImplicitCopyAssignmentOperatorsDeclared; 8475 8476 if (Scope *S = getScopeForContext(ClassDecl)) 8477 PushOnScopeChains(CopyAssignment, S, false); 8478 ClassDecl->addDecl(CopyAssignment); 8479 8480 return CopyAssignment; 8481} 8482 8483void Sema::DefineImplicitCopyAssignment(SourceLocation CurrentLocation, 8484 CXXMethodDecl *CopyAssignOperator) { 8485 assert((CopyAssignOperator->isDefaulted() && 8486 CopyAssignOperator->isOverloadedOperator() && 8487 CopyAssignOperator->getOverloadedOperator() == OO_Equal && 8488 !CopyAssignOperator->doesThisDeclarationHaveABody() && 8489 !CopyAssignOperator->isDeleted()) && 8490 "DefineImplicitCopyAssignment called for wrong function"); 8491 8492 CXXRecordDecl *ClassDecl = CopyAssignOperator->getParent(); 8493 8494 if (ClassDecl->isInvalidDecl() || CopyAssignOperator->isInvalidDecl()) { 8495 CopyAssignOperator->setInvalidDecl(); 8496 return; 8497 } 8498 8499 CopyAssignOperator->setUsed(); 8500 8501 SynthesizedFunctionScope Scope(*this, CopyAssignOperator); 8502 DiagnosticErrorTrap Trap(Diags); 8503 8504 // C++0x [class.copy]p30: 8505 // The implicitly-defined or explicitly-defaulted copy assignment operator 8506 // for a non-union class X performs memberwise copy assignment of its 8507 // subobjects. The direct base classes of X are assigned first, in the 8508 // order of their declaration in the base-specifier-list, and then the 8509 // immediate non-static data members of X are assigned, in the order in 8510 // which they were declared in the class definition. 8511 8512 // The statements that form the synthesized function body. 8513 SmallVector<Stmt*, 8> Statements; 8514 8515 // The parameter for the "other" object, which we are copying from. 8516 ParmVarDecl *Other = CopyAssignOperator->getParamDecl(0); 8517 Qualifiers OtherQuals = Other->getType().getQualifiers(); 8518 QualType OtherRefType = Other->getType(); 8519 if (const LValueReferenceType *OtherRef 8520 = OtherRefType->getAs<LValueReferenceType>()) { 8521 OtherRefType = OtherRef->getPointeeType(); 8522 OtherQuals = OtherRefType.getQualifiers(); 8523 } 8524 8525 // Our location for everything implicitly-generated. 8526 SourceLocation Loc = CopyAssignOperator->getLocation(); 8527 8528 // Construct a reference to the "other" object. We'll be using this 8529 // throughout the generated ASTs. 8530 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8531 assert(OtherRef && "Reference to parameter cannot fail!"); 8532 8533 // Construct the "this" pointer. We'll be using this throughout the generated 8534 // ASTs. 8535 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8536 assert(This && "Reference to this cannot fail!"); 8537 8538 // Assign base classes. 8539 bool Invalid = false; 8540 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8541 E = ClassDecl->bases_end(); Base != E; ++Base) { 8542 // Form the assignment: 8543 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&>(other)); 8544 QualType BaseType = Base->getType().getUnqualifiedType(); 8545 if (!BaseType->isRecordType()) { 8546 Invalid = true; 8547 continue; 8548 } 8549 8550 CXXCastPath BasePath; 8551 BasePath.push_back(Base); 8552 8553 // Construct the "from" expression, which is an implicit cast to the 8554 // appropriately-qualified base type. 8555 Expr *From = OtherRef; 8556 From = ImpCastExprToType(From, Context.getQualifiedType(BaseType, OtherQuals), 8557 CK_UncheckedDerivedToBase, 8558 VK_LValue, &BasePath).take(); 8559 8560 // Dereference "this". 8561 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8562 8563 // Implicitly cast "this" to the appropriately-qualified base type. 8564 To = ImpCastExprToType(To.take(), 8565 Context.getCVRQualifiedType(BaseType, 8566 CopyAssignOperator->getTypeQualifiers()), 8567 CK_UncheckedDerivedToBase, 8568 VK_LValue, &BasePath); 8569 8570 // Build the copy. 8571 StmtResult Copy = buildSingleCopyAssign(*this, Loc, BaseType, 8572 To.get(), From, 8573 /*CopyingBaseSubobject=*/true, 8574 /*Copying=*/true); 8575 if (Copy.isInvalid()) { 8576 Diag(CurrentLocation, diag::note_member_synthesized_at) 8577 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8578 CopyAssignOperator->setInvalidDecl(); 8579 return; 8580 } 8581 8582 // Success! Record the copy. 8583 Statements.push_back(Copy.takeAs<Expr>()); 8584 } 8585 8586 // Assign non-static members. 8587 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8588 FieldEnd = ClassDecl->field_end(); 8589 Field != FieldEnd; ++Field) { 8590 if (Field->isUnnamedBitfield()) 8591 continue; 8592 8593 // Check for members of reference type; we can't copy those. 8594 if (Field->getType()->isReferenceType()) { 8595 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8596 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 8597 Diag(Field->getLocation(), diag::note_declared_at); 8598 Diag(CurrentLocation, diag::note_member_synthesized_at) 8599 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8600 Invalid = true; 8601 continue; 8602 } 8603 8604 // Check for members of const-qualified, non-class type. 8605 QualType BaseType = Context.getBaseElementType(Field->getType()); 8606 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 8607 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 8608 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 8609 Diag(Field->getLocation(), diag::note_declared_at); 8610 Diag(CurrentLocation, diag::note_member_synthesized_at) 8611 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8612 Invalid = true; 8613 continue; 8614 } 8615 8616 // Suppress assigning zero-width bitfields. 8617 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 8618 continue; 8619 8620 QualType FieldType = Field->getType().getNonReferenceType(); 8621 if (FieldType->isIncompleteArrayType()) { 8622 assert(ClassDecl->hasFlexibleArrayMember() && 8623 "Incomplete array type is not valid"); 8624 continue; 8625 } 8626 8627 // Build references to the field in the object we're copying from and to. 8628 CXXScopeSpec SS; // Intentionally empty 8629 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 8630 LookupMemberName); 8631 MemberLookup.addDecl(*Field); 8632 MemberLookup.resolveKind(); 8633 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 8634 Loc, /*IsArrow=*/false, 8635 SS, SourceLocation(), 0, 8636 MemberLookup, 0); 8637 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 8638 Loc, /*IsArrow=*/true, 8639 SS, SourceLocation(), 0, 8640 MemberLookup, 0); 8641 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 8642 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 8643 8644 // Build the copy of this field. 8645 StmtResult Copy = buildSingleCopyAssign(*this, Loc, FieldType, 8646 To.get(), From.get(), 8647 /*CopyingBaseSubobject=*/false, 8648 /*Copying=*/true); 8649 if (Copy.isInvalid()) { 8650 Diag(CurrentLocation, diag::note_member_synthesized_at) 8651 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8652 CopyAssignOperator->setInvalidDecl(); 8653 return; 8654 } 8655 8656 // Success! Record the copy. 8657 Statements.push_back(Copy.takeAs<Stmt>()); 8658 } 8659 8660 if (!Invalid) { 8661 // Add a "return *this;" 8662 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 8663 8664 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 8665 if (Return.isInvalid()) 8666 Invalid = true; 8667 else { 8668 Statements.push_back(Return.takeAs<Stmt>()); 8669 8670 if (Trap.hasErrorOccurred()) { 8671 Diag(CurrentLocation, diag::note_member_synthesized_at) 8672 << CXXCopyAssignment << Context.getTagDeclType(ClassDecl); 8673 Invalid = true; 8674 } 8675 } 8676 } 8677 8678 if (Invalid) { 8679 CopyAssignOperator->setInvalidDecl(); 8680 return; 8681 } 8682 8683 StmtResult Body; 8684 { 8685 CompoundScopeRAII CompoundScope(*this); 8686 Body = ActOnCompoundStmt(Loc, Loc, Statements, 8687 /*isStmtExpr=*/false); 8688 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 8689 } 8690 CopyAssignOperator->setBody(Body.takeAs<Stmt>()); 8691 8692 if (ASTMutationListener *L = getASTMutationListener()) { 8693 L->CompletedImplicitDefinition(CopyAssignOperator); 8694 } 8695} 8696 8697Sema::ImplicitExceptionSpecification 8698Sema::ComputeDefaultedMoveAssignmentExceptionSpec(CXXMethodDecl *MD) { 8699 CXXRecordDecl *ClassDecl = MD->getParent(); 8700 8701 ImplicitExceptionSpecification ExceptSpec(*this); 8702 if (ClassDecl->isInvalidDecl()) 8703 return ExceptSpec; 8704 8705 // C++0x [except.spec]p14: 8706 // An implicitly declared special member function (Clause 12) shall have an 8707 // exception-specification. [...] 8708 8709 // It is unspecified whether or not an implicit move assignment operator 8710 // attempts to deduplicate calls to assignment operators of virtual bases are 8711 // made. As such, this exception specification is effectively unspecified. 8712 // Based on a similar decision made for constness in C++0x, we're erring on 8713 // the side of assuming such calls to be made regardless of whether they 8714 // actually happen. 8715 // Note that a move constructor is not implicitly declared when there are 8716 // virtual bases, but it can still be user-declared and explicitly defaulted. 8717 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8718 BaseEnd = ClassDecl->bases_end(); 8719 Base != BaseEnd; ++Base) { 8720 if (Base->isVirtual()) 8721 continue; 8722 8723 CXXRecordDecl *BaseClassDecl 8724 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8725 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8726 0, false, 0)) 8727 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8728 } 8729 8730 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8731 BaseEnd = ClassDecl->vbases_end(); 8732 Base != BaseEnd; ++Base) { 8733 CXXRecordDecl *BaseClassDecl 8734 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8735 if (CXXMethodDecl *MoveAssign = LookupMovingAssignment(BaseClassDecl, 8736 0, false, 0)) 8737 ExceptSpec.CalledDecl(Base->getLocStart(), MoveAssign); 8738 } 8739 8740 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8741 FieldEnd = ClassDecl->field_end(); 8742 Field != FieldEnd; 8743 ++Field) { 8744 QualType FieldType = Context.getBaseElementType(Field->getType()); 8745 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 8746 if (CXXMethodDecl *MoveAssign = 8747 LookupMovingAssignment(FieldClassDecl, 8748 FieldType.getCVRQualifiers(), 8749 false, 0)) 8750 ExceptSpec.CalledDecl(Field->getLocation(), MoveAssign); 8751 } 8752 } 8753 8754 return ExceptSpec; 8755} 8756 8757/// Determine whether the class type has any direct or indirect virtual base 8758/// classes which have a non-trivial move assignment operator. 8759static bool 8760hasVirtualBaseWithNonTrivialMoveAssignment(Sema &S, CXXRecordDecl *ClassDecl) { 8761 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8762 BaseEnd = ClassDecl->vbases_end(); 8763 Base != BaseEnd; ++Base) { 8764 CXXRecordDecl *BaseClass = 8765 cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 8766 8767 // Try to declare the move assignment. If it would be deleted, then the 8768 // class does not have a non-trivial move assignment. 8769 if (BaseClass->needsImplicitMoveAssignment()) 8770 S.DeclareImplicitMoveAssignment(BaseClass); 8771 8772 if (BaseClass->hasNonTrivialMoveAssignment()) 8773 return true; 8774 } 8775 8776 return false; 8777} 8778 8779/// Determine whether the given type either has a move constructor or is 8780/// trivially copyable. 8781static bool 8782hasMoveOrIsTriviallyCopyable(Sema &S, QualType Type, bool IsConstructor) { 8783 Type = S.Context.getBaseElementType(Type); 8784 8785 // FIXME: Technically, non-trivially-copyable non-class types, such as 8786 // reference types, are supposed to return false here, but that appears 8787 // to be a standard defect. 8788 CXXRecordDecl *ClassDecl = Type->getAsCXXRecordDecl(); 8789 if (!ClassDecl || !ClassDecl->getDefinition() || ClassDecl->isInvalidDecl()) 8790 return true; 8791 8792 if (Type.isTriviallyCopyableType(S.Context)) 8793 return true; 8794 8795 if (IsConstructor) { 8796 // FIXME: Need this because otherwise hasMoveConstructor isn't guaranteed to 8797 // give the right answer. 8798 if (ClassDecl->needsImplicitMoveConstructor()) 8799 S.DeclareImplicitMoveConstructor(ClassDecl); 8800 return ClassDecl->hasMoveConstructor(); 8801 } 8802 8803 // FIXME: Need this because otherwise hasMoveAssignment isn't guaranteed to 8804 // give the right answer. 8805 if (ClassDecl->needsImplicitMoveAssignment()) 8806 S.DeclareImplicitMoveAssignment(ClassDecl); 8807 return ClassDecl->hasMoveAssignment(); 8808} 8809 8810/// Determine whether all non-static data members and direct or virtual bases 8811/// of class \p ClassDecl have either a move operation, or are trivially 8812/// copyable. 8813static bool subobjectsHaveMoveOrTrivialCopy(Sema &S, CXXRecordDecl *ClassDecl, 8814 bool IsConstructor) { 8815 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8816 BaseEnd = ClassDecl->bases_end(); 8817 Base != BaseEnd; ++Base) { 8818 if (Base->isVirtual()) 8819 continue; 8820 8821 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8822 return false; 8823 } 8824 8825 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 8826 BaseEnd = ClassDecl->vbases_end(); 8827 Base != BaseEnd; ++Base) { 8828 if (!hasMoveOrIsTriviallyCopyable(S, Base->getType(), IsConstructor)) 8829 return false; 8830 } 8831 8832 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 8833 FieldEnd = ClassDecl->field_end(); 8834 Field != FieldEnd; ++Field) { 8835 if (!hasMoveOrIsTriviallyCopyable(S, Field->getType(), IsConstructor)) 8836 return false; 8837 } 8838 8839 return true; 8840} 8841 8842CXXMethodDecl *Sema::DeclareImplicitMoveAssignment(CXXRecordDecl *ClassDecl) { 8843 // C++11 [class.copy]p20: 8844 // If the definition of a class X does not explicitly declare a move 8845 // assignment operator, one will be implicitly declared as defaulted 8846 // if and only if: 8847 // 8848 // - [first 4 bullets] 8849 assert(ClassDecl->needsImplicitMoveAssignment()); 8850 8851 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveAssignment); 8852 if (DSM.isAlreadyBeingDeclared()) 8853 return 0; 8854 8855 // [Checked after we build the declaration] 8856 // - the move assignment operator would not be implicitly defined as 8857 // deleted, 8858 8859 // [DR1402]: 8860 // - X has no direct or indirect virtual base class with a non-trivial 8861 // move assignment operator, and 8862 // - each of X's non-static data members and direct or virtual base classes 8863 // has a type that either has a move assignment operator or is trivially 8864 // copyable. 8865 if (hasVirtualBaseWithNonTrivialMoveAssignment(*this, ClassDecl) || 8866 !subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl,/*Constructor*/false)) { 8867 ClassDecl->setFailedImplicitMoveAssignment(); 8868 return 0; 8869 } 8870 8871 // Note: The following rules are largely analoguous to the move 8872 // constructor rules. 8873 8874 QualType ArgType = Context.getTypeDeclType(ClassDecl); 8875 QualType RetType = Context.getLValueReferenceType(ArgType); 8876 ArgType = Context.getRValueReferenceType(ArgType); 8877 8878 // An implicitly-declared move assignment operator is an inline public 8879 // member of its class. 8880 DeclarationName Name = Context.DeclarationNames.getCXXOperatorName(OO_Equal); 8881 SourceLocation ClassLoc = ClassDecl->getLocation(); 8882 DeclarationNameInfo NameInfo(Name, ClassLoc); 8883 CXXMethodDecl *MoveAssignment 8884 = CXXMethodDecl::Create(Context, ClassDecl, ClassLoc, NameInfo, QualType(), 8885 /*TInfo=*/0, /*isStatic=*/false, 8886 /*StorageClassAsWritten=*/SC_None, 8887 /*isInline=*/true, 8888 /*isConstexpr=*/false, 8889 SourceLocation()); 8890 MoveAssignment->setAccess(AS_public); 8891 MoveAssignment->setDefaulted(); 8892 MoveAssignment->setImplicit(); 8893 8894 // Build an exception specification pointing back at this member. 8895 FunctionProtoType::ExtProtoInfo EPI; 8896 EPI.ExceptionSpecType = EST_Unevaluated; 8897 EPI.ExceptionSpecDecl = MoveAssignment; 8898 MoveAssignment->setType(Context.getFunctionType(RetType, ArgType, EPI)); 8899 8900 // Add the parameter to the operator. 8901 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveAssignment, 8902 ClassLoc, ClassLoc, /*Id=*/0, 8903 ArgType, /*TInfo=*/0, 8904 SC_None, 8905 SC_None, 0); 8906 MoveAssignment->setParams(FromParam); 8907 8908 AddOverriddenMethods(ClassDecl, MoveAssignment); 8909 8910 MoveAssignment->setTrivial( 8911 ClassDecl->needsOverloadResolutionForMoveAssignment() 8912 ? SpecialMemberIsTrivial(MoveAssignment, CXXMoveAssignment) 8913 : ClassDecl->hasTrivialMoveAssignment()); 8914 8915 // C++0x [class.copy]p9: 8916 // If the definition of a class X does not explicitly declare a move 8917 // assignment operator, one will be implicitly declared as defaulted if and 8918 // only if: 8919 // [...] 8920 // - the move assignment operator would not be implicitly defined as 8921 // deleted. 8922 if (ShouldDeleteSpecialMember(MoveAssignment, CXXMoveAssignment)) { 8923 // Cache this result so that we don't try to generate this over and over 8924 // on every lookup, leaking memory and wasting time. 8925 ClassDecl->setFailedImplicitMoveAssignment(); 8926 return 0; 8927 } 8928 8929 // Note that we have added this copy-assignment operator. 8930 ++ASTContext::NumImplicitMoveAssignmentOperatorsDeclared; 8931 8932 if (Scope *S = getScopeForContext(ClassDecl)) 8933 PushOnScopeChains(MoveAssignment, S, false); 8934 ClassDecl->addDecl(MoveAssignment); 8935 8936 return MoveAssignment; 8937} 8938 8939void Sema::DefineImplicitMoveAssignment(SourceLocation CurrentLocation, 8940 CXXMethodDecl *MoveAssignOperator) { 8941 assert((MoveAssignOperator->isDefaulted() && 8942 MoveAssignOperator->isOverloadedOperator() && 8943 MoveAssignOperator->getOverloadedOperator() == OO_Equal && 8944 !MoveAssignOperator->doesThisDeclarationHaveABody() && 8945 !MoveAssignOperator->isDeleted()) && 8946 "DefineImplicitMoveAssignment called for wrong function"); 8947 8948 CXXRecordDecl *ClassDecl = MoveAssignOperator->getParent(); 8949 8950 if (ClassDecl->isInvalidDecl() || MoveAssignOperator->isInvalidDecl()) { 8951 MoveAssignOperator->setInvalidDecl(); 8952 return; 8953 } 8954 8955 MoveAssignOperator->setUsed(); 8956 8957 SynthesizedFunctionScope Scope(*this, MoveAssignOperator); 8958 DiagnosticErrorTrap Trap(Diags); 8959 8960 // C++0x [class.copy]p28: 8961 // The implicitly-defined or move assignment operator for a non-union class 8962 // X performs memberwise move assignment of its subobjects. The direct base 8963 // classes of X are assigned first, in the order of their declaration in the 8964 // base-specifier-list, and then the immediate non-static data members of X 8965 // are assigned, in the order in which they were declared in the class 8966 // definition. 8967 8968 // The statements that form the synthesized function body. 8969 SmallVector<Stmt*, 8> Statements; 8970 8971 // The parameter for the "other" object, which we are move from. 8972 ParmVarDecl *Other = MoveAssignOperator->getParamDecl(0); 8973 QualType OtherRefType = Other->getType()-> 8974 getAs<RValueReferenceType>()->getPointeeType(); 8975 assert(OtherRefType.getQualifiers() == 0 && 8976 "Bad argument type of defaulted move assignment"); 8977 8978 // Our location for everything implicitly-generated. 8979 SourceLocation Loc = MoveAssignOperator->getLocation(); 8980 8981 // Construct a reference to the "other" object. We'll be using this 8982 // throughout the generated ASTs. 8983 Expr *OtherRef = BuildDeclRefExpr(Other, OtherRefType, VK_LValue, Loc).take(); 8984 assert(OtherRef && "Reference to parameter cannot fail!"); 8985 // Cast to rvalue. 8986 OtherRef = CastForMoving(*this, OtherRef); 8987 8988 // Construct the "this" pointer. We'll be using this throughout the generated 8989 // ASTs. 8990 Expr *This = ActOnCXXThis(Loc).takeAs<Expr>(); 8991 assert(This && "Reference to this cannot fail!"); 8992 8993 // Assign base classes. 8994 bool Invalid = false; 8995 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 8996 E = ClassDecl->bases_end(); Base != E; ++Base) { 8997 // Form the assignment: 8998 // static_cast<Base*>(this)->Base::operator=(static_cast<Base&&>(other)); 8999 QualType BaseType = Base->getType().getUnqualifiedType(); 9000 if (!BaseType->isRecordType()) { 9001 Invalid = true; 9002 continue; 9003 } 9004 9005 CXXCastPath BasePath; 9006 BasePath.push_back(Base); 9007 9008 // Construct the "from" expression, which is an implicit cast to the 9009 // appropriately-qualified base type. 9010 Expr *From = OtherRef; 9011 From = ImpCastExprToType(From, BaseType, CK_UncheckedDerivedToBase, 9012 VK_XValue, &BasePath).take(); 9013 9014 // Dereference "this". 9015 ExprResult To = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9016 9017 // Implicitly cast "this" to the appropriately-qualified base type. 9018 To = ImpCastExprToType(To.take(), 9019 Context.getCVRQualifiedType(BaseType, 9020 MoveAssignOperator->getTypeQualifiers()), 9021 CK_UncheckedDerivedToBase, 9022 VK_LValue, &BasePath); 9023 9024 // Build the move. 9025 StmtResult Move = buildSingleCopyAssign(*this, Loc, BaseType, 9026 To.get(), From, 9027 /*CopyingBaseSubobject=*/true, 9028 /*Copying=*/false); 9029 if (Move.isInvalid()) { 9030 Diag(CurrentLocation, diag::note_member_synthesized_at) 9031 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9032 MoveAssignOperator->setInvalidDecl(); 9033 return; 9034 } 9035 9036 // Success! Record the move. 9037 Statements.push_back(Move.takeAs<Expr>()); 9038 } 9039 9040 // Assign non-static members. 9041 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9042 FieldEnd = ClassDecl->field_end(); 9043 Field != FieldEnd; ++Field) { 9044 if (Field->isUnnamedBitfield()) 9045 continue; 9046 9047 // Check for members of reference type; we can't move those. 9048 if (Field->getType()->isReferenceType()) { 9049 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9050 << Context.getTagDeclType(ClassDecl) << 0 << Field->getDeclName(); 9051 Diag(Field->getLocation(), diag::note_declared_at); 9052 Diag(CurrentLocation, diag::note_member_synthesized_at) 9053 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9054 Invalid = true; 9055 continue; 9056 } 9057 9058 // Check for members of const-qualified, non-class type. 9059 QualType BaseType = Context.getBaseElementType(Field->getType()); 9060 if (!BaseType->getAs<RecordType>() && BaseType.isConstQualified()) { 9061 Diag(ClassDecl->getLocation(), diag::err_uninitialized_member_for_assign) 9062 << Context.getTagDeclType(ClassDecl) << 1 << Field->getDeclName(); 9063 Diag(Field->getLocation(), diag::note_declared_at); 9064 Diag(CurrentLocation, diag::note_member_synthesized_at) 9065 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9066 Invalid = true; 9067 continue; 9068 } 9069 9070 // Suppress assigning zero-width bitfields. 9071 if (Field->isBitField() && Field->getBitWidthValue(Context) == 0) 9072 continue; 9073 9074 QualType FieldType = Field->getType().getNonReferenceType(); 9075 if (FieldType->isIncompleteArrayType()) { 9076 assert(ClassDecl->hasFlexibleArrayMember() && 9077 "Incomplete array type is not valid"); 9078 continue; 9079 } 9080 9081 // Build references to the field in the object we're copying from and to. 9082 CXXScopeSpec SS; // Intentionally empty 9083 LookupResult MemberLookup(*this, Field->getDeclName(), Loc, 9084 LookupMemberName); 9085 MemberLookup.addDecl(*Field); 9086 MemberLookup.resolveKind(); 9087 ExprResult From = BuildMemberReferenceExpr(OtherRef, OtherRefType, 9088 Loc, /*IsArrow=*/false, 9089 SS, SourceLocation(), 0, 9090 MemberLookup, 0); 9091 ExprResult To = BuildMemberReferenceExpr(This, This->getType(), 9092 Loc, /*IsArrow=*/true, 9093 SS, SourceLocation(), 0, 9094 MemberLookup, 0); 9095 assert(!From.isInvalid() && "Implicit field reference cannot fail"); 9096 assert(!To.isInvalid() && "Implicit field reference cannot fail"); 9097 9098 assert(!From.get()->isLValue() && // could be xvalue or prvalue 9099 "Member reference with rvalue base must be rvalue except for reference " 9100 "members, which aren't allowed for move assignment."); 9101 9102 // Build the move of this field. 9103 StmtResult Move = buildSingleCopyAssign(*this, Loc, FieldType, 9104 To.get(), From.get(), 9105 /*CopyingBaseSubobject=*/false, 9106 /*Copying=*/false); 9107 if (Move.isInvalid()) { 9108 Diag(CurrentLocation, diag::note_member_synthesized_at) 9109 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9110 MoveAssignOperator->setInvalidDecl(); 9111 return; 9112 } 9113 9114 // Success! Record the copy. 9115 Statements.push_back(Move.takeAs<Stmt>()); 9116 } 9117 9118 if (!Invalid) { 9119 // Add a "return *this;" 9120 ExprResult ThisObj = CreateBuiltinUnaryOp(Loc, UO_Deref, This); 9121 9122 StmtResult Return = ActOnReturnStmt(Loc, ThisObj.get()); 9123 if (Return.isInvalid()) 9124 Invalid = true; 9125 else { 9126 Statements.push_back(Return.takeAs<Stmt>()); 9127 9128 if (Trap.hasErrorOccurred()) { 9129 Diag(CurrentLocation, diag::note_member_synthesized_at) 9130 << CXXMoveAssignment << Context.getTagDeclType(ClassDecl); 9131 Invalid = true; 9132 } 9133 } 9134 } 9135 9136 if (Invalid) { 9137 MoveAssignOperator->setInvalidDecl(); 9138 return; 9139 } 9140 9141 StmtResult Body; 9142 { 9143 CompoundScopeRAII CompoundScope(*this); 9144 Body = ActOnCompoundStmt(Loc, Loc, Statements, 9145 /*isStmtExpr=*/false); 9146 assert(!Body.isInvalid() && "Compound statement creation cannot fail"); 9147 } 9148 MoveAssignOperator->setBody(Body.takeAs<Stmt>()); 9149 9150 if (ASTMutationListener *L = getASTMutationListener()) { 9151 L->CompletedImplicitDefinition(MoveAssignOperator); 9152 } 9153} 9154 9155Sema::ImplicitExceptionSpecification 9156Sema::ComputeDefaultedCopyCtorExceptionSpec(CXXMethodDecl *MD) { 9157 CXXRecordDecl *ClassDecl = MD->getParent(); 9158 9159 ImplicitExceptionSpecification ExceptSpec(*this); 9160 if (ClassDecl->isInvalidDecl()) 9161 return ExceptSpec; 9162 9163 const FunctionProtoType *T = MD->getType()->castAs<FunctionProtoType>(); 9164 assert(T->getNumArgs() >= 1 && "not a copy ctor"); 9165 unsigned Quals = T->getArgType(0).getNonReferenceType().getCVRQualifiers(); 9166 9167 // C++ [except.spec]p14: 9168 // An implicitly declared special member function (Clause 12) shall have an 9169 // exception-specification. [...] 9170 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->bases_begin(), 9171 BaseEnd = ClassDecl->bases_end(); 9172 Base != BaseEnd; 9173 ++Base) { 9174 // Virtual bases are handled below. 9175 if (Base->isVirtual()) 9176 continue; 9177 9178 CXXRecordDecl *BaseClassDecl 9179 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9180 if (CXXConstructorDecl *CopyConstructor = 9181 LookupCopyingConstructor(BaseClassDecl, Quals)) 9182 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9183 } 9184 for (CXXRecordDecl::base_class_iterator Base = ClassDecl->vbases_begin(), 9185 BaseEnd = ClassDecl->vbases_end(); 9186 Base != BaseEnd; 9187 ++Base) { 9188 CXXRecordDecl *BaseClassDecl 9189 = cast<CXXRecordDecl>(Base->getType()->getAs<RecordType>()->getDecl()); 9190 if (CXXConstructorDecl *CopyConstructor = 9191 LookupCopyingConstructor(BaseClassDecl, Quals)) 9192 ExceptSpec.CalledDecl(Base->getLocStart(), CopyConstructor); 9193 } 9194 for (CXXRecordDecl::field_iterator Field = ClassDecl->field_begin(), 9195 FieldEnd = ClassDecl->field_end(); 9196 Field != FieldEnd; 9197 ++Field) { 9198 QualType FieldType = Context.getBaseElementType(Field->getType()); 9199 if (CXXRecordDecl *FieldClassDecl = FieldType->getAsCXXRecordDecl()) { 9200 if (CXXConstructorDecl *CopyConstructor = 9201 LookupCopyingConstructor(FieldClassDecl, 9202 Quals | FieldType.getCVRQualifiers())) 9203 ExceptSpec.CalledDecl(Field->getLocation(), CopyConstructor); 9204 } 9205 } 9206 9207 return ExceptSpec; 9208} 9209 9210CXXConstructorDecl *Sema::DeclareImplicitCopyConstructor( 9211 CXXRecordDecl *ClassDecl) { 9212 // C++ [class.copy]p4: 9213 // If the class definition does not explicitly declare a copy 9214 // constructor, one is declared implicitly. 9215 assert(ClassDecl->needsImplicitCopyConstructor()); 9216 9217 DeclaringSpecialMember DSM(*this, ClassDecl, CXXCopyConstructor); 9218 if (DSM.isAlreadyBeingDeclared()) 9219 return 0; 9220 9221 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9222 QualType ArgType = ClassType; 9223 bool Const = ClassDecl->implicitCopyConstructorHasConstParam(); 9224 if (Const) 9225 ArgType = ArgType.withConst(); 9226 ArgType = Context.getLValueReferenceType(ArgType); 9227 9228 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9229 CXXCopyConstructor, 9230 Const); 9231 9232 DeclarationName Name 9233 = Context.DeclarationNames.getCXXConstructorName( 9234 Context.getCanonicalType(ClassType)); 9235 SourceLocation ClassLoc = ClassDecl->getLocation(); 9236 DeclarationNameInfo NameInfo(Name, ClassLoc); 9237 9238 // An implicitly-declared copy constructor is an inline public 9239 // member of its class. 9240 CXXConstructorDecl *CopyConstructor = CXXConstructorDecl::Create( 9241 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9242 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9243 Constexpr); 9244 CopyConstructor->setAccess(AS_public); 9245 CopyConstructor->setDefaulted(); 9246 9247 // Build an exception specification pointing back at this member. 9248 FunctionProtoType::ExtProtoInfo EPI; 9249 EPI.ExceptionSpecType = EST_Unevaluated; 9250 EPI.ExceptionSpecDecl = CopyConstructor; 9251 CopyConstructor->setType( 9252 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9253 9254 // Add the parameter to the constructor. 9255 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, CopyConstructor, 9256 ClassLoc, ClassLoc, 9257 /*IdentifierInfo=*/0, 9258 ArgType, /*TInfo=*/0, 9259 SC_None, 9260 SC_None, 0); 9261 CopyConstructor->setParams(FromParam); 9262 9263 CopyConstructor->setTrivial( 9264 ClassDecl->needsOverloadResolutionForCopyConstructor() 9265 ? SpecialMemberIsTrivial(CopyConstructor, CXXCopyConstructor) 9266 : ClassDecl->hasTrivialCopyConstructor()); 9267 9268 // C++11 [class.copy]p8: 9269 // ... If the class definition does not explicitly declare a copy 9270 // constructor, there is no user-declared move constructor, and there is no 9271 // user-declared move assignment operator, a copy constructor is implicitly 9272 // declared as defaulted. 9273 if (ShouldDeleteSpecialMember(CopyConstructor, CXXCopyConstructor)) 9274 CopyConstructor->setDeletedAsWritten(); 9275 9276 // Note that we have declared this constructor. 9277 ++ASTContext::NumImplicitCopyConstructorsDeclared; 9278 9279 if (Scope *S = getScopeForContext(ClassDecl)) 9280 PushOnScopeChains(CopyConstructor, S, false); 9281 ClassDecl->addDecl(CopyConstructor); 9282 9283 return CopyConstructor; 9284} 9285 9286void Sema::DefineImplicitCopyConstructor(SourceLocation CurrentLocation, 9287 CXXConstructorDecl *CopyConstructor) { 9288 assert((CopyConstructor->isDefaulted() && 9289 CopyConstructor->isCopyConstructor() && 9290 !CopyConstructor->doesThisDeclarationHaveABody() && 9291 !CopyConstructor->isDeleted()) && 9292 "DefineImplicitCopyConstructor - call it for implicit copy ctor"); 9293 9294 CXXRecordDecl *ClassDecl = CopyConstructor->getParent(); 9295 assert(ClassDecl && "DefineImplicitCopyConstructor - invalid constructor"); 9296 9297 SynthesizedFunctionScope Scope(*this, CopyConstructor); 9298 DiagnosticErrorTrap Trap(Diags); 9299 9300 if (SetCtorInitializers(CopyConstructor, /*AnyErrors=*/false) || 9301 Trap.hasErrorOccurred()) { 9302 Diag(CurrentLocation, diag::note_member_synthesized_at) 9303 << CXXCopyConstructor << Context.getTagDeclType(ClassDecl); 9304 CopyConstructor->setInvalidDecl(); 9305 } else { 9306 Sema::CompoundScopeRAII CompoundScope(*this); 9307 CopyConstructor->setBody(ActOnCompoundStmt(CopyConstructor->getLocation(), 9308 CopyConstructor->getLocation(), 9309 MultiStmtArg(), 9310 /*isStmtExpr=*/false) 9311 .takeAs<Stmt>()); 9312 CopyConstructor->setImplicitlyDefined(true); 9313 } 9314 9315 CopyConstructor->setUsed(); 9316 if (ASTMutationListener *L = getASTMutationListener()) { 9317 L->CompletedImplicitDefinition(CopyConstructor); 9318 } 9319} 9320 9321Sema::ImplicitExceptionSpecification 9322Sema::ComputeDefaultedMoveCtorExceptionSpec(CXXMethodDecl *MD) { 9323 CXXRecordDecl *ClassDecl = MD->getParent(); 9324 9325 // C++ [except.spec]p14: 9326 // An implicitly declared special member function (Clause 12) shall have an 9327 // exception-specification. [...] 9328 ImplicitExceptionSpecification ExceptSpec(*this); 9329 if (ClassDecl->isInvalidDecl()) 9330 return ExceptSpec; 9331 9332 // Direct base-class constructors. 9333 for (CXXRecordDecl::base_class_iterator B = ClassDecl->bases_begin(), 9334 BEnd = ClassDecl->bases_end(); 9335 B != BEnd; ++B) { 9336 if (B->isVirtual()) // Handled below. 9337 continue; 9338 9339 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9340 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9341 CXXConstructorDecl *Constructor = 9342 LookupMovingConstructor(BaseClassDecl, 0); 9343 // If this is a deleted function, add it anyway. This might be conformant 9344 // with the standard. This might not. I'm not sure. It might not matter. 9345 if (Constructor) 9346 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9347 } 9348 } 9349 9350 // Virtual base-class constructors. 9351 for (CXXRecordDecl::base_class_iterator B = ClassDecl->vbases_begin(), 9352 BEnd = ClassDecl->vbases_end(); 9353 B != BEnd; ++B) { 9354 if (const RecordType *BaseType = B->getType()->getAs<RecordType>()) { 9355 CXXRecordDecl *BaseClassDecl = cast<CXXRecordDecl>(BaseType->getDecl()); 9356 CXXConstructorDecl *Constructor = 9357 LookupMovingConstructor(BaseClassDecl, 0); 9358 // If this is a deleted function, add it anyway. This might be conformant 9359 // with the standard. This might not. I'm not sure. It might not matter. 9360 if (Constructor) 9361 ExceptSpec.CalledDecl(B->getLocStart(), Constructor); 9362 } 9363 } 9364 9365 // Field constructors. 9366 for (RecordDecl::field_iterator F = ClassDecl->field_begin(), 9367 FEnd = ClassDecl->field_end(); 9368 F != FEnd; ++F) { 9369 QualType FieldType = Context.getBaseElementType(F->getType()); 9370 if (CXXRecordDecl *FieldRecDecl = FieldType->getAsCXXRecordDecl()) { 9371 CXXConstructorDecl *Constructor = 9372 LookupMovingConstructor(FieldRecDecl, FieldType.getCVRQualifiers()); 9373 // If this is a deleted function, add it anyway. This might be conformant 9374 // with the standard. This might not. I'm not sure. It might not matter. 9375 // In particular, the problem is that this function never gets called. It 9376 // might just be ill-formed because this function attempts to refer to 9377 // a deleted function here. 9378 if (Constructor) 9379 ExceptSpec.CalledDecl(F->getLocation(), Constructor); 9380 } 9381 } 9382 9383 return ExceptSpec; 9384} 9385 9386CXXConstructorDecl *Sema::DeclareImplicitMoveConstructor( 9387 CXXRecordDecl *ClassDecl) { 9388 // C++11 [class.copy]p9: 9389 // If the definition of a class X does not explicitly declare a move 9390 // constructor, one will be implicitly declared as defaulted if and only if: 9391 // 9392 // - [first 4 bullets] 9393 assert(ClassDecl->needsImplicitMoveConstructor()); 9394 9395 DeclaringSpecialMember DSM(*this, ClassDecl, CXXMoveConstructor); 9396 if (DSM.isAlreadyBeingDeclared()) 9397 return 0; 9398 9399 // [Checked after we build the declaration] 9400 // - the move assignment operator would not be implicitly defined as 9401 // deleted, 9402 9403 // [DR1402]: 9404 // - each of X's non-static data members and direct or virtual base classes 9405 // has a type that either has a move constructor or is trivially copyable. 9406 if (!subobjectsHaveMoveOrTrivialCopy(*this, ClassDecl, /*Constructor*/true)) { 9407 ClassDecl->setFailedImplicitMoveConstructor(); 9408 return 0; 9409 } 9410 9411 QualType ClassType = Context.getTypeDeclType(ClassDecl); 9412 QualType ArgType = Context.getRValueReferenceType(ClassType); 9413 9414 bool Constexpr = defaultedSpecialMemberIsConstexpr(*this, ClassDecl, 9415 CXXMoveConstructor, 9416 false); 9417 9418 DeclarationName Name 9419 = Context.DeclarationNames.getCXXConstructorName( 9420 Context.getCanonicalType(ClassType)); 9421 SourceLocation ClassLoc = ClassDecl->getLocation(); 9422 DeclarationNameInfo NameInfo(Name, ClassLoc); 9423 9424 // C++0x [class.copy]p11: 9425 // An implicitly-declared copy/move constructor is an inline public 9426 // member of its class. 9427 CXXConstructorDecl *MoveConstructor = CXXConstructorDecl::Create( 9428 Context, ClassDecl, ClassLoc, NameInfo, QualType(), /*TInfo=*/0, 9429 /*isExplicit=*/false, /*isInline=*/true, /*isImplicitlyDeclared=*/true, 9430 Constexpr); 9431 MoveConstructor->setAccess(AS_public); 9432 MoveConstructor->setDefaulted(); 9433 9434 // Build an exception specification pointing back at this member. 9435 FunctionProtoType::ExtProtoInfo EPI; 9436 EPI.ExceptionSpecType = EST_Unevaluated; 9437 EPI.ExceptionSpecDecl = MoveConstructor; 9438 MoveConstructor->setType( 9439 Context.getFunctionType(Context.VoidTy, ArgType, EPI)); 9440 9441 // Add the parameter to the constructor. 9442 ParmVarDecl *FromParam = ParmVarDecl::Create(Context, MoveConstructor, 9443 ClassLoc, ClassLoc, 9444 /*IdentifierInfo=*/0, 9445 ArgType, /*TInfo=*/0, 9446 SC_None, 9447 SC_None, 0); 9448 MoveConstructor->setParams(FromParam); 9449 9450 MoveConstructor->setTrivial( 9451 ClassDecl->needsOverloadResolutionForMoveConstructor() 9452 ? SpecialMemberIsTrivial(MoveConstructor, CXXMoveConstructor) 9453 : ClassDecl->hasTrivialMoveConstructor()); 9454 9455 // C++0x [class.copy]p9: 9456 // If the definition of a class X does not explicitly declare a move 9457 // constructor, one will be implicitly declared as defaulted if and only if: 9458 // [...] 9459 // - the move constructor would not be implicitly defined as deleted. 9460 if (ShouldDeleteSpecialMember(MoveConstructor, CXXMoveConstructor)) { 9461 // Cache this result so that we don't try to generate this over and over 9462 // on every lookup, leaking memory and wasting time. 9463 ClassDecl->setFailedImplicitMoveConstructor(); 9464 return 0; 9465 } 9466 9467 // Note that we have declared this constructor. 9468 ++ASTContext::NumImplicitMoveConstructorsDeclared; 9469 9470 if (Scope *S = getScopeForContext(ClassDecl)) 9471 PushOnScopeChains(MoveConstructor, S, false); 9472 ClassDecl->addDecl(MoveConstructor); 9473 9474 return MoveConstructor; 9475} 9476 9477void Sema::DefineImplicitMoveConstructor(SourceLocation CurrentLocation, 9478 CXXConstructorDecl *MoveConstructor) { 9479 assert((MoveConstructor->isDefaulted() && 9480 MoveConstructor->isMoveConstructor() && 9481 !MoveConstructor->doesThisDeclarationHaveABody() && 9482 !MoveConstructor->isDeleted()) && 9483 "DefineImplicitMoveConstructor - call it for implicit move ctor"); 9484 9485 CXXRecordDecl *ClassDecl = MoveConstructor->getParent(); 9486 assert(ClassDecl && "DefineImplicitMoveConstructor - invalid constructor"); 9487 9488 SynthesizedFunctionScope Scope(*this, MoveConstructor); 9489 DiagnosticErrorTrap Trap(Diags); 9490 9491 if (SetCtorInitializers(MoveConstructor, /*AnyErrors=*/false) || 9492 Trap.hasErrorOccurred()) { 9493 Diag(CurrentLocation, diag::note_member_synthesized_at) 9494 << CXXMoveConstructor << Context.getTagDeclType(ClassDecl); 9495 MoveConstructor->setInvalidDecl(); 9496 } else { 9497 Sema::CompoundScopeRAII CompoundScope(*this); 9498 MoveConstructor->setBody(ActOnCompoundStmt(MoveConstructor->getLocation(), 9499 MoveConstructor->getLocation(), 9500 MultiStmtArg(), 9501 /*isStmtExpr=*/false) 9502 .takeAs<Stmt>()); 9503 MoveConstructor->setImplicitlyDefined(true); 9504 } 9505 9506 MoveConstructor->setUsed(); 9507 9508 if (ASTMutationListener *L = getASTMutationListener()) { 9509 L->CompletedImplicitDefinition(MoveConstructor); 9510 } 9511} 9512 9513bool Sema::isImplicitlyDeleted(FunctionDecl *FD) { 9514 return FD->isDeleted() && 9515 (FD->isDefaulted() || FD->isImplicit()) && 9516 isa<CXXMethodDecl>(FD); 9517} 9518 9519/// \brief Mark the call operator of the given lambda closure type as "used". 9520static void markLambdaCallOperatorUsed(Sema &S, CXXRecordDecl *Lambda) { 9521 CXXMethodDecl *CallOperator 9522 = cast<CXXMethodDecl>( 9523 Lambda->lookup( 9524 S.Context.DeclarationNames.getCXXOperatorName(OO_Call)).front()); 9525 CallOperator->setReferenced(); 9526 CallOperator->setUsed(); 9527} 9528 9529void Sema::DefineImplicitLambdaToFunctionPointerConversion( 9530 SourceLocation CurrentLocation, 9531 CXXConversionDecl *Conv) 9532{ 9533 CXXRecordDecl *Lambda = Conv->getParent(); 9534 9535 // Make sure that the lambda call operator is marked used. 9536 markLambdaCallOperatorUsed(*this, Lambda); 9537 9538 Conv->setUsed(); 9539 9540 SynthesizedFunctionScope Scope(*this, Conv); 9541 DiagnosticErrorTrap Trap(Diags); 9542 9543 // Return the address of the __invoke function. 9544 DeclarationName InvokeName = &Context.Idents.get("__invoke"); 9545 CXXMethodDecl *Invoke 9546 = cast<CXXMethodDecl>(Lambda->lookup(InvokeName).front()); 9547 Expr *FunctionRef = BuildDeclRefExpr(Invoke, Invoke->getType(), 9548 VK_LValue, Conv->getLocation()).take(); 9549 assert(FunctionRef && "Can't refer to __invoke function?"); 9550 Stmt *Return = ActOnReturnStmt(Conv->getLocation(), FunctionRef).take(); 9551 Conv->setBody(new (Context) CompoundStmt(Context, Return, 9552 Conv->getLocation(), 9553 Conv->getLocation())); 9554 9555 // Fill in the __invoke function with a dummy implementation. IR generation 9556 // will fill in the actual details. 9557 Invoke->setUsed(); 9558 Invoke->setReferenced(); 9559 Invoke->setBody(new (Context) CompoundStmt(Conv->getLocation())); 9560 9561 if (ASTMutationListener *L = getASTMutationListener()) { 9562 L->CompletedImplicitDefinition(Conv); 9563 L->CompletedImplicitDefinition(Invoke); 9564 } 9565} 9566 9567void Sema::DefineImplicitLambdaToBlockPointerConversion( 9568 SourceLocation CurrentLocation, 9569 CXXConversionDecl *Conv) 9570{ 9571 Conv->setUsed(); 9572 9573 SynthesizedFunctionScope Scope(*this, Conv); 9574 DiagnosticErrorTrap Trap(Diags); 9575 9576 // Copy-initialize the lambda object as needed to capture it. 9577 Expr *This = ActOnCXXThis(CurrentLocation).take(); 9578 Expr *DerefThis =CreateBuiltinUnaryOp(CurrentLocation, UO_Deref, This).take(); 9579 9580 ExprResult BuildBlock = BuildBlockForLambdaConversion(CurrentLocation, 9581 Conv->getLocation(), 9582 Conv, DerefThis); 9583 9584 // If we're not under ARC, make sure we still get the _Block_copy/autorelease 9585 // behavior. Note that only the general conversion function does this 9586 // (since it's unusable otherwise); in the case where we inline the 9587 // block literal, it has block literal lifetime semantics. 9588 if (!BuildBlock.isInvalid() && !getLangOpts().ObjCAutoRefCount) 9589 BuildBlock = ImplicitCastExpr::Create(Context, BuildBlock.get()->getType(), 9590 CK_CopyAndAutoreleaseBlockObject, 9591 BuildBlock.get(), 0, VK_RValue); 9592 9593 if (BuildBlock.isInvalid()) { 9594 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9595 Conv->setInvalidDecl(); 9596 return; 9597 } 9598 9599 // Create the return statement that returns the block from the conversion 9600 // function. 9601 StmtResult Return = ActOnReturnStmt(Conv->getLocation(), BuildBlock.get()); 9602 if (Return.isInvalid()) { 9603 Diag(CurrentLocation, diag::note_lambda_to_block_conv); 9604 Conv->setInvalidDecl(); 9605 return; 9606 } 9607 9608 // Set the body of the conversion function. 9609 Stmt *ReturnS = Return.take(); 9610 Conv->setBody(new (Context) CompoundStmt(Context, ReturnS, 9611 Conv->getLocation(), 9612 Conv->getLocation())); 9613 9614 // We're done; notify the mutation listener, if any. 9615 if (ASTMutationListener *L = getASTMutationListener()) { 9616 L->CompletedImplicitDefinition(Conv); 9617 } 9618} 9619 9620/// \brief Determine whether the given list arguments contains exactly one 9621/// "real" (non-default) argument. 9622static bool hasOneRealArgument(MultiExprArg Args) { 9623 switch (Args.size()) { 9624 case 0: 9625 return false; 9626 9627 default: 9628 if (!Args[1]->isDefaultArgument()) 9629 return false; 9630 9631 // fall through 9632 case 1: 9633 return !Args[0]->isDefaultArgument(); 9634 } 9635 9636 return false; 9637} 9638 9639ExprResult 9640Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9641 CXXConstructorDecl *Constructor, 9642 MultiExprArg ExprArgs, 9643 bool HadMultipleCandidates, 9644 bool IsListInitialization, 9645 bool RequiresZeroInit, 9646 unsigned ConstructKind, 9647 SourceRange ParenRange) { 9648 bool Elidable = false; 9649 9650 // C++0x [class.copy]p34: 9651 // When certain criteria are met, an implementation is allowed to 9652 // omit the copy/move construction of a class object, even if the 9653 // copy/move constructor and/or destructor for the object have 9654 // side effects. [...] 9655 // - when a temporary class object that has not been bound to a 9656 // reference (12.2) would be copied/moved to a class object 9657 // with the same cv-unqualified type, the copy/move operation 9658 // can be omitted by constructing the temporary object 9659 // directly into the target of the omitted copy/move 9660 if (ConstructKind == CXXConstructExpr::CK_Complete && 9661 Constructor->isCopyOrMoveConstructor() && hasOneRealArgument(ExprArgs)) { 9662 Expr *SubExpr = ExprArgs[0]; 9663 Elidable = SubExpr->isTemporaryObject(Context, Constructor->getParent()); 9664 } 9665 9666 return BuildCXXConstructExpr(ConstructLoc, DeclInitType, Constructor, 9667 Elidable, ExprArgs, HadMultipleCandidates, 9668 IsListInitialization, RequiresZeroInit, 9669 ConstructKind, ParenRange); 9670} 9671 9672/// BuildCXXConstructExpr - Creates a complete call to a constructor, 9673/// including handling of its default argument expressions. 9674ExprResult 9675Sema::BuildCXXConstructExpr(SourceLocation ConstructLoc, QualType DeclInitType, 9676 CXXConstructorDecl *Constructor, bool Elidable, 9677 MultiExprArg ExprArgs, 9678 bool HadMultipleCandidates, 9679 bool IsListInitialization, 9680 bool RequiresZeroInit, 9681 unsigned ConstructKind, 9682 SourceRange ParenRange) { 9683 MarkFunctionReferenced(ConstructLoc, Constructor); 9684 return Owned(CXXConstructExpr::Create(Context, DeclInitType, ConstructLoc, 9685 Constructor, Elidable, ExprArgs, 9686 HadMultipleCandidates, 9687 IsListInitialization, RequiresZeroInit, 9688 static_cast<CXXConstructExpr::ConstructionKind>(ConstructKind), 9689 ParenRange)); 9690} 9691 9692void Sema::FinalizeVarWithDestructor(VarDecl *VD, const RecordType *Record) { 9693 if (VD->isInvalidDecl()) return; 9694 9695 CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(Record->getDecl()); 9696 if (ClassDecl->isInvalidDecl()) return; 9697 if (ClassDecl->hasIrrelevantDestructor()) return; 9698 if (ClassDecl->isDependentContext()) return; 9699 9700 CXXDestructorDecl *Destructor = LookupDestructor(ClassDecl); 9701 MarkFunctionReferenced(VD->getLocation(), Destructor); 9702 CheckDestructorAccess(VD->getLocation(), Destructor, 9703 PDiag(diag::err_access_dtor_var) 9704 << VD->getDeclName() 9705 << VD->getType()); 9706 DiagnoseUseOfDecl(Destructor, VD->getLocation()); 9707 9708 if (!VD->hasGlobalStorage()) return; 9709 9710 // Emit warning for non-trivial dtor in global scope (a real global, 9711 // class-static, function-static). 9712 Diag(VD->getLocation(), diag::warn_exit_time_destructor); 9713 9714 // TODO: this should be re-enabled for static locals by !CXAAtExit 9715 if (!VD->isStaticLocal()) 9716 Diag(VD->getLocation(), diag::warn_global_destructor); 9717} 9718 9719/// \brief Given a constructor and the set of arguments provided for the 9720/// constructor, convert the arguments and add any required default arguments 9721/// to form a proper call to this constructor. 9722/// 9723/// \returns true if an error occurred, false otherwise. 9724bool 9725Sema::CompleteConstructorCall(CXXConstructorDecl *Constructor, 9726 MultiExprArg ArgsPtr, 9727 SourceLocation Loc, 9728 SmallVectorImpl<Expr*> &ConvertedArgs, 9729 bool AllowExplicit, 9730 bool IsListInitialization) { 9731 // FIXME: This duplicates a lot of code from Sema::ConvertArgumentsForCall. 9732 unsigned NumArgs = ArgsPtr.size(); 9733 Expr **Args = ArgsPtr.data(); 9734 9735 const FunctionProtoType *Proto 9736 = Constructor->getType()->getAs<FunctionProtoType>(); 9737 assert(Proto && "Constructor without a prototype?"); 9738 unsigned NumArgsInProto = Proto->getNumArgs(); 9739 9740 // If too few arguments are available, we'll fill in the rest with defaults. 9741 if (NumArgs < NumArgsInProto) 9742 ConvertedArgs.reserve(NumArgsInProto); 9743 else 9744 ConvertedArgs.reserve(NumArgs); 9745 9746 VariadicCallType CallType = 9747 Proto->isVariadic() ? VariadicConstructor : VariadicDoesNotApply; 9748 SmallVector<Expr *, 8> AllArgs; 9749 bool Invalid = GatherArgumentsForCall(Loc, Constructor, 9750 Proto, 0, Args, NumArgs, AllArgs, 9751 CallType, AllowExplicit, 9752 IsListInitialization); 9753 ConvertedArgs.append(AllArgs.begin(), AllArgs.end()); 9754 9755 DiagnoseSentinelCalls(Constructor, Loc, AllArgs.data(), AllArgs.size()); 9756 9757 CheckConstructorCall(Constructor, 9758 llvm::makeArrayRef<const Expr *>(AllArgs.data(), 9759 AllArgs.size()), 9760 Proto, Loc); 9761 9762 return Invalid; 9763} 9764 9765static inline bool 9766CheckOperatorNewDeleteDeclarationScope(Sema &SemaRef, 9767 const FunctionDecl *FnDecl) { 9768 const DeclContext *DC = FnDecl->getDeclContext()->getRedeclContext(); 9769 if (isa<NamespaceDecl>(DC)) { 9770 return SemaRef.Diag(FnDecl->getLocation(), 9771 diag::err_operator_new_delete_declared_in_namespace) 9772 << FnDecl->getDeclName(); 9773 } 9774 9775 if (isa<TranslationUnitDecl>(DC) && 9776 FnDecl->getStorageClass() == SC_Static) { 9777 return SemaRef.Diag(FnDecl->getLocation(), 9778 diag::err_operator_new_delete_declared_static) 9779 << FnDecl->getDeclName(); 9780 } 9781 9782 return false; 9783} 9784 9785static inline bool 9786CheckOperatorNewDeleteTypes(Sema &SemaRef, const FunctionDecl *FnDecl, 9787 CanQualType ExpectedResultType, 9788 CanQualType ExpectedFirstParamType, 9789 unsigned DependentParamTypeDiag, 9790 unsigned InvalidParamTypeDiag) { 9791 QualType ResultType = 9792 FnDecl->getType()->getAs<FunctionType>()->getResultType(); 9793 9794 // Check that the result type is not dependent. 9795 if (ResultType->isDependentType()) 9796 return SemaRef.Diag(FnDecl->getLocation(), 9797 diag::err_operator_new_delete_dependent_result_type) 9798 << FnDecl->getDeclName() << ExpectedResultType; 9799 9800 // Check that the result type is what we expect. 9801 if (SemaRef.Context.getCanonicalType(ResultType) != ExpectedResultType) 9802 return SemaRef.Diag(FnDecl->getLocation(), 9803 diag::err_operator_new_delete_invalid_result_type) 9804 << FnDecl->getDeclName() << ExpectedResultType; 9805 9806 // A function template must have at least 2 parameters. 9807 if (FnDecl->getDescribedFunctionTemplate() && FnDecl->getNumParams() < 2) 9808 return SemaRef.Diag(FnDecl->getLocation(), 9809 diag::err_operator_new_delete_template_too_few_parameters) 9810 << FnDecl->getDeclName(); 9811 9812 // The function decl must have at least 1 parameter. 9813 if (FnDecl->getNumParams() == 0) 9814 return SemaRef.Diag(FnDecl->getLocation(), 9815 diag::err_operator_new_delete_too_few_parameters) 9816 << FnDecl->getDeclName(); 9817 9818 // Check the first parameter type is not dependent. 9819 QualType FirstParamType = FnDecl->getParamDecl(0)->getType(); 9820 if (FirstParamType->isDependentType()) 9821 return SemaRef.Diag(FnDecl->getLocation(), DependentParamTypeDiag) 9822 << FnDecl->getDeclName() << ExpectedFirstParamType; 9823 9824 // Check that the first parameter type is what we expect. 9825 if (SemaRef.Context.getCanonicalType(FirstParamType).getUnqualifiedType() != 9826 ExpectedFirstParamType) 9827 return SemaRef.Diag(FnDecl->getLocation(), InvalidParamTypeDiag) 9828 << FnDecl->getDeclName() << ExpectedFirstParamType; 9829 9830 return false; 9831} 9832 9833static bool 9834CheckOperatorNewDeclaration(Sema &SemaRef, const FunctionDecl *FnDecl) { 9835 // C++ [basic.stc.dynamic.allocation]p1: 9836 // A program is ill-formed if an allocation function is declared in a 9837 // namespace scope other than global scope or declared static in global 9838 // scope. 9839 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9840 return true; 9841 9842 CanQualType SizeTy = 9843 SemaRef.Context.getCanonicalType(SemaRef.Context.getSizeType()); 9844 9845 // C++ [basic.stc.dynamic.allocation]p1: 9846 // The return type shall be void*. The first parameter shall have type 9847 // std::size_t. 9848 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidPtrTy, 9849 SizeTy, 9850 diag::err_operator_new_dependent_param_type, 9851 diag::err_operator_new_param_type)) 9852 return true; 9853 9854 // C++ [basic.stc.dynamic.allocation]p1: 9855 // The first parameter shall not have an associated default argument. 9856 if (FnDecl->getParamDecl(0)->hasDefaultArg()) 9857 return SemaRef.Diag(FnDecl->getLocation(), 9858 diag::err_operator_new_default_arg) 9859 << FnDecl->getDeclName() << FnDecl->getParamDecl(0)->getDefaultArgRange(); 9860 9861 return false; 9862} 9863 9864static bool 9865CheckOperatorDeleteDeclaration(Sema &SemaRef, FunctionDecl *FnDecl) { 9866 // C++ [basic.stc.dynamic.deallocation]p1: 9867 // A program is ill-formed if deallocation functions are declared in a 9868 // namespace scope other than global scope or declared static in global 9869 // scope. 9870 if (CheckOperatorNewDeleteDeclarationScope(SemaRef, FnDecl)) 9871 return true; 9872 9873 // C++ [basic.stc.dynamic.deallocation]p2: 9874 // Each deallocation function shall return void and its first parameter 9875 // shall be void*. 9876 if (CheckOperatorNewDeleteTypes(SemaRef, FnDecl, SemaRef.Context.VoidTy, 9877 SemaRef.Context.VoidPtrTy, 9878 diag::err_operator_delete_dependent_param_type, 9879 diag::err_operator_delete_param_type)) 9880 return true; 9881 9882 return false; 9883} 9884 9885/// CheckOverloadedOperatorDeclaration - Check whether the declaration 9886/// of this overloaded operator is well-formed. If so, returns false; 9887/// otherwise, emits appropriate diagnostics and returns true. 9888bool Sema::CheckOverloadedOperatorDeclaration(FunctionDecl *FnDecl) { 9889 assert(FnDecl && FnDecl->isOverloadedOperator() && 9890 "Expected an overloaded operator declaration"); 9891 9892 OverloadedOperatorKind Op = FnDecl->getOverloadedOperator(); 9893 9894 // C++ [over.oper]p5: 9895 // The allocation and deallocation functions, operator new, 9896 // operator new[], operator delete and operator delete[], are 9897 // described completely in 3.7.3. The attributes and restrictions 9898 // found in the rest of this subclause do not apply to them unless 9899 // explicitly stated in 3.7.3. 9900 if (Op == OO_Delete || Op == OO_Array_Delete) 9901 return CheckOperatorDeleteDeclaration(*this, FnDecl); 9902 9903 if (Op == OO_New || Op == OO_Array_New) 9904 return CheckOperatorNewDeclaration(*this, FnDecl); 9905 9906 // C++ [over.oper]p6: 9907 // An operator function shall either be a non-static member 9908 // function or be a non-member function and have at least one 9909 // parameter whose type is a class, a reference to a class, an 9910 // enumeration, or a reference to an enumeration. 9911 if (CXXMethodDecl *MethodDecl = dyn_cast<CXXMethodDecl>(FnDecl)) { 9912 if (MethodDecl->isStatic()) 9913 return Diag(FnDecl->getLocation(), 9914 diag::err_operator_overload_static) << FnDecl->getDeclName(); 9915 } else { 9916 bool ClassOrEnumParam = false; 9917 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 9918 ParamEnd = FnDecl->param_end(); 9919 Param != ParamEnd; ++Param) { 9920 QualType ParamType = (*Param)->getType().getNonReferenceType(); 9921 if (ParamType->isDependentType() || ParamType->isRecordType() || 9922 ParamType->isEnumeralType()) { 9923 ClassOrEnumParam = true; 9924 break; 9925 } 9926 } 9927 9928 if (!ClassOrEnumParam) 9929 return Diag(FnDecl->getLocation(), 9930 diag::err_operator_overload_needs_class_or_enum) 9931 << FnDecl->getDeclName(); 9932 } 9933 9934 // C++ [over.oper]p8: 9935 // An operator function cannot have default arguments (8.3.6), 9936 // except where explicitly stated below. 9937 // 9938 // Only the function-call operator allows default arguments 9939 // (C++ [over.call]p1). 9940 if (Op != OO_Call) { 9941 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(); 9942 Param != FnDecl->param_end(); ++Param) { 9943 if ((*Param)->hasDefaultArg()) 9944 return Diag((*Param)->getLocation(), 9945 diag::err_operator_overload_default_arg) 9946 << FnDecl->getDeclName() << (*Param)->getDefaultArgRange(); 9947 } 9948 } 9949 9950 static const bool OperatorUses[NUM_OVERLOADED_OPERATORS][3] = { 9951 { false, false, false } 9952#define OVERLOADED_OPERATOR(Name,Spelling,Token,Unary,Binary,MemberOnly) \ 9953 , { Unary, Binary, MemberOnly } 9954#include "clang/Basic/OperatorKinds.def" 9955 }; 9956 9957 bool CanBeUnaryOperator = OperatorUses[Op][0]; 9958 bool CanBeBinaryOperator = OperatorUses[Op][1]; 9959 bool MustBeMemberOperator = OperatorUses[Op][2]; 9960 9961 // C++ [over.oper]p8: 9962 // [...] Operator functions cannot have more or fewer parameters 9963 // than the number required for the corresponding operator, as 9964 // described in the rest of this subclause. 9965 unsigned NumParams = FnDecl->getNumParams() 9966 + (isa<CXXMethodDecl>(FnDecl)? 1 : 0); 9967 if (Op != OO_Call && 9968 ((NumParams == 1 && !CanBeUnaryOperator) || 9969 (NumParams == 2 && !CanBeBinaryOperator) || 9970 (NumParams < 1) || (NumParams > 2))) { 9971 // We have the wrong number of parameters. 9972 unsigned ErrorKind; 9973 if (CanBeUnaryOperator && CanBeBinaryOperator) { 9974 ErrorKind = 2; // 2 -> unary or binary. 9975 } else if (CanBeUnaryOperator) { 9976 ErrorKind = 0; // 0 -> unary 9977 } else { 9978 assert(CanBeBinaryOperator && 9979 "All non-call overloaded operators are unary or binary!"); 9980 ErrorKind = 1; // 1 -> binary 9981 } 9982 9983 return Diag(FnDecl->getLocation(), diag::err_operator_overload_must_be) 9984 << FnDecl->getDeclName() << NumParams << ErrorKind; 9985 } 9986 9987 // Overloaded operators other than operator() cannot be variadic. 9988 if (Op != OO_Call && 9989 FnDecl->getType()->getAs<FunctionProtoType>()->isVariadic()) { 9990 return Diag(FnDecl->getLocation(), diag::err_operator_overload_variadic) 9991 << FnDecl->getDeclName(); 9992 } 9993 9994 // Some operators must be non-static member functions. 9995 if (MustBeMemberOperator && !isa<CXXMethodDecl>(FnDecl)) { 9996 return Diag(FnDecl->getLocation(), 9997 diag::err_operator_overload_must_be_member) 9998 << FnDecl->getDeclName(); 9999 } 10000 10001 // C++ [over.inc]p1: 10002 // The user-defined function called operator++ implements the 10003 // prefix and postfix ++ operator. If this function is a member 10004 // function with no parameters, or a non-member function with one 10005 // parameter of class or enumeration type, it defines the prefix 10006 // increment operator ++ for objects of that type. If the function 10007 // is a member function with one parameter (which shall be of type 10008 // int) or a non-member function with two parameters (the second 10009 // of which shall be of type int), it defines the postfix 10010 // increment operator ++ for objects of that type. 10011 if ((Op == OO_PlusPlus || Op == OO_MinusMinus) && NumParams == 2) { 10012 ParmVarDecl *LastParam = FnDecl->getParamDecl(FnDecl->getNumParams() - 1); 10013 bool ParamIsInt = false; 10014 if (const BuiltinType *BT = LastParam->getType()->getAs<BuiltinType>()) 10015 ParamIsInt = BT->getKind() == BuiltinType::Int; 10016 10017 if (!ParamIsInt) 10018 return Diag(LastParam->getLocation(), 10019 diag::err_operator_overload_post_incdec_must_be_int) 10020 << LastParam->getType() << (Op == OO_MinusMinus); 10021 } 10022 10023 return false; 10024} 10025 10026/// CheckLiteralOperatorDeclaration - Check whether the declaration 10027/// of this literal operator function is well-formed. If so, returns 10028/// false; otherwise, emits appropriate diagnostics and returns true. 10029bool Sema::CheckLiteralOperatorDeclaration(FunctionDecl *FnDecl) { 10030 if (isa<CXXMethodDecl>(FnDecl)) { 10031 Diag(FnDecl->getLocation(), diag::err_literal_operator_outside_namespace) 10032 << FnDecl->getDeclName(); 10033 return true; 10034 } 10035 10036 if (FnDecl->isExternC()) { 10037 Diag(FnDecl->getLocation(), diag::err_literal_operator_extern_c); 10038 return true; 10039 } 10040 10041 bool Valid = false; 10042 10043 // This might be the definition of a literal operator template. 10044 FunctionTemplateDecl *TpDecl = FnDecl->getDescribedFunctionTemplate(); 10045 // This might be a specialization of a literal operator template. 10046 if (!TpDecl) 10047 TpDecl = FnDecl->getPrimaryTemplate(); 10048 10049 // template <char...> type operator "" name() is the only valid template 10050 // signature, and the only valid signature with no parameters. 10051 if (TpDecl) { 10052 if (FnDecl->param_size() == 0) { 10053 // Must have only one template parameter 10054 TemplateParameterList *Params = TpDecl->getTemplateParameters(); 10055 if (Params->size() == 1) { 10056 NonTypeTemplateParmDecl *PmDecl = 10057 dyn_cast<NonTypeTemplateParmDecl>(Params->getParam(0)); 10058 10059 // The template parameter must be a char parameter pack. 10060 if (PmDecl && PmDecl->isTemplateParameterPack() && 10061 Context.hasSameType(PmDecl->getType(), Context.CharTy)) 10062 Valid = true; 10063 } 10064 } 10065 } else if (FnDecl->param_size()) { 10066 // Check the first parameter 10067 FunctionDecl::param_iterator Param = FnDecl->param_begin(); 10068 10069 QualType T = (*Param)->getType().getUnqualifiedType(); 10070 10071 // unsigned long long int, long double, and any character type are allowed 10072 // as the only parameters. 10073 if (Context.hasSameType(T, Context.UnsignedLongLongTy) || 10074 Context.hasSameType(T, Context.LongDoubleTy) || 10075 Context.hasSameType(T, Context.CharTy) || 10076 Context.hasSameType(T, Context.WCharTy) || 10077 Context.hasSameType(T, Context.Char16Ty) || 10078 Context.hasSameType(T, Context.Char32Ty)) { 10079 if (++Param == FnDecl->param_end()) 10080 Valid = true; 10081 goto FinishedParams; 10082 } 10083 10084 // Otherwise it must be a pointer to const; let's strip those qualifiers. 10085 const PointerType *PT = T->getAs<PointerType>(); 10086 if (!PT) 10087 goto FinishedParams; 10088 T = PT->getPointeeType(); 10089 if (!T.isConstQualified() || T.isVolatileQualified()) 10090 goto FinishedParams; 10091 T = T.getUnqualifiedType(); 10092 10093 // Move on to the second parameter; 10094 ++Param; 10095 10096 // If there is no second parameter, the first must be a const char * 10097 if (Param == FnDecl->param_end()) { 10098 if (Context.hasSameType(T, Context.CharTy)) 10099 Valid = true; 10100 goto FinishedParams; 10101 } 10102 10103 // const char *, const wchar_t*, const char16_t*, and const char32_t* 10104 // are allowed as the first parameter to a two-parameter function 10105 if (!(Context.hasSameType(T, Context.CharTy) || 10106 Context.hasSameType(T, Context.WCharTy) || 10107 Context.hasSameType(T, Context.Char16Ty) || 10108 Context.hasSameType(T, Context.Char32Ty))) 10109 goto FinishedParams; 10110 10111 // The second and final parameter must be an std::size_t 10112 T = (*Param)->getType().getUnqualifiedType(); 10113 if (Context.hasSameType(T, Context.getSizeType()) && 10114 ++Param == FnDecl->param_end()) 10115 Valid = true; 10116 } 10117 10118 // FIXME: This diagnostic is absolutely terrible. 10119FinishedParams: 10120 if (!Valid) { 10121 Diag(FnDecl->getLocation(), diag::err_literal_operator_params) 10122 << FnDecl->getDeclName(); 10123 return true; 10124 } 10125 10126 // A parameter-declaration-clause containing a default argument is not 10127 // equivalent to any of the permitted forms. 10128 for (FunctionDecl::param_iterator Param = FnDecl->param_begin(), 10129 ParamEnd = FnDecl->param_end(); 10130 Param != ParamEnd; ++Param) { 10131 if ((*Param)->hasDefaultArg()) { 10132 Diag((*Param)->getDefaultArgRange().getBegin(), 10133 diag::err_literal_operator_default_argument) 10134 << (*Param)->getDefaultArgRange(); 10135 break; 10136 } 10137 } 10138 10139 StringRef LiteralName 10140 = FnDecl->getDeclName().getCXXLiteralIdentifier()->getName(); 10141 if (LiteralName[0] != '_') { 10142 // C++11 [usrlit.suffix]p1: 10143 // Literal suffix identifiers that do not start with an underscore 10144 // are reserved for future standardization. 10145 Diag(FnDecl->getLocation(), diag::warn_user_literal_reserved); 10146 } 10147 10148 return false; 10149} 10150 10151/// ActOnStartLinkageSpecification - Parsed the beginning of a C++ 10152/// linkage specification, including the language and (if present) 10153/// the '{'. ExternLoc is the location of the 'extern', LangLoc is 10154/// the location of the language string literal, which is provided 10155/// by Lang/StrSize. LBraceLoc, if valid, provides the location of 10156/// the '{' brace. Otherwise, this linkage specification does not 10157/// have any braces. 10158Decl *Sema::ActOnStartLinkageSpecification(Scope *S, SourceLocation ExternLoc, 10159 SourceLocation LangLoc, 10160 StringRef Lang, 10161 SourceLocation LBraceLoc) { 10162 LinkageSpecDecl::LanguageIDs Language; 10163 if (Lang == "\"C\"") 10164 Language = LinkageSpecDecl::lang_c; 10165 else if (Lang == "\"C++\"") 10166 Language = LinkageSpecDecl::lang_cxx; 10167 else { 10168 Diag(LangLoc, diag::err_bad_language); 10169 return 0; 10170 } 10171 10172 // FIXME: Add all the various semantics of linkage specifications 10173 10174 LinkageSpecDecl *D = LinkageSpecDecl::Create(Context, CurContext, 10175 ExternLoc, LangLoc, Language); 10176 CurContext->addDecl(D); 10177 PushDeclContext(S, D); 10178 return D; 10179} 10180 10181/// ActOnFinishLinkageSpecification - Complete the definition of 10182/// the C++ linkage specification LinkageSpec. If RBraceLoc is 10183/// valid, it's the position of the closing '}' brace in a linkage 10184/// specification that uses braces. 10185Decl *Sema::ActOnFinishLinkageSpecification(Scope *S, 10186 Decl *LinkageSpec, 10187 SourceLocation RBraceLoc) { 10188 if (LinkageSpec) { 10189 if (RBraceLoc.isValid()) { 10190 LinkageSpecDecl* LSDecl = cast<LinkageSpecDecl>(LinkageSpec); 10191 LSDecl->setRBraceLoc(RBraceLoc); 10192 } 10193 PopDeclContext(); 10194 } 10195 return LinkageSpec; 10196} 10197 10198Decl *Sema::ActOnEmptyDeclaration(Scope *S, 10199 AttributeList *AttrList, 10200 SourceLocation SemiLoc) { 10201 Decl *ED = EmptyDecl::Create(Context, CurContext, SemiLoc); 10202 // Attribute declarations appertain to empty declaration so we handle 10203 // them here. 10204 if (AttrList) 10205 ProcessDeclAttributeList(S, ED, AttrList); 10206 10207 CurContext->addDecl(ED); 10208 return ED; 10209} 10210 10211/// \brief Perform semantic analysis for the variable declaration that 10212/// occurs within a C++ catch clause, returning the newly-created 10213/// variable. 10214VarDecl *Sema::BuildExceptionDeclaration(Scope *S, 10215 TypeSourceInfo *TInfo, 10216 SourceLocation StartLoc, 10217 SourceLocation Loc, 10218 IdentifierInfo *Name) { 10219 bool Invalid = false; 10220 QualType ExDeclType = TInfo->getType(); 10221 10222 // Arrays and functions decay. 10223 if (ExDeclType->isArrayType()) 10224 ExDeclType = Context.getArrayDecayedType(ExDeclType); 10225 else if (ExDeclType->isFunctionType()) 10226 ExDeclType = Context.getPointerType(ExDeclType); 10227 10228 // C++ 15.3p1: The exception-declaration shall not denote an incomplete type. 10229 // The exception-declaration shall not denote a pointer or reference to an 10230 // incomplete type, other than [cv] void*. 10231 // N2844 forbids rvalue references. 10232 if (!ExDeclType->isDependentType() && ExDeclType->isRValueReferenceType()) { 10233 Diag(Loc, diag::err_catch_rvalue_ref); 10234 Invalid = true; 10235 } 10236 10237 QualType BaseType = ExDeclType; 10238 int Mode = 0; // 0 for direct type, 1 for pointer, 2 for reference 10239 unsigned DK = diag::err_catch_incomplete; 10240 if (const PointerType *Ptr = BaseType->getAs<PointerType>()) { 10241 BaseType = Ptr->getPointeeType(); 10242 Mode = 1; 10243 DK = diag::err_catch_incomplete_ptr; 10244 } else if (const ReferenceType *Ref = BaseType->getAs<ReferenceType>()) { 10245 // For the purpose of error recovery, we treat rvalue refs like lvalue refs. 10246 BaseType = Ref->getPointeeType(); 10247 Mode = 2; 10248 DK = diag::err_catch_incomplete_ref; 10249 } 10250 if (!Invalid && (Mode == 0 || !BaseType->isVoidType()) && 10251 !BaseType->isDependentType() && RequireCompleteType(Loc, BaseType, DK)) 10252 Invalid = true; 10253 10254 if (!Invalid && !ExDeclType->isDependentType() && 10255 RequireNonAbstractType(Loc, ExDeclType, 10256 diag::err_abstract_type_in_decl, 10257 AbstractVariableType)) 10258 Invalid = true; 10259 10260 // Only the non-fragile NeXT runtime currently supports C++ catches 10261 // of ObjC types, and no runtime supports catching ObjC types by value. 10262 if (!Invalid && getLangOpts().ObjC1) { 10263 QualType T = ExDeclType; 10264 if (const ReferenceType *RT = T->getAs<ReferenceType>()) 10265 T = RT->getPointeeType(); 10266 10267 if (T->isObjCObjectType()) { 10268 Diag(Loc, diag::err_objc_object_catch); 10269 Invalid = true; 10270 } else if (T->isObjCObjectPointerType()) { 10271 // FIXME: should this be a test for macosx-fragile specifically? 10272 if (getLangOpts().ObjCRuntime.isFragile()) 10273 Diag(Loc, diag::warn_objc_pointer_cxx_catch_fragile); 10274 } 10275 } 10276 10277 VarDecl *ExDecl = VarDecl::Create(Context, CurContext, StartLoc, Loc, Name, 10278 ExDeclType, TInfo, SC_None, SC_None); 10279 ExDecl->setExceptionVariable(true); 10280 10281 // In ARC, infer 'retaining' for variables of retainable type. 10282 if (getLangOpts().ObjCAutoRefCount && inferObjCARCLifetime(ExDecl)) 10283 Invalid = true; 10284 10285 if (!Invalid && !ExDeclType->isDependentType()) { 10286 if (const RecordType *recordType = ExDeclType->getAs<RecordType>()) { 10287 // Insulate this from anything else we might currently be parsing. 10288 EnterExpressionEvaluationContext scope(*this, PotentiallyEvaluated); 10289 10290 // C++ [except.handle]p16: 10291 // The object declared in an exception-declaration or, if the 10292 // exception-declaration does not specify a name, a temporary (12.2) is 10293 // copy-initialized (8.5) from the exception object. [...] 10294 // The object is destroyed when the handler exits, after the destruction 10295 // of any automatic objects initialized within the handler. 10296 // 10297 // We just pretend to initialize the object with itself, then make sure 10298 // it can be destroyed later. 10299 QualType initType = ExDeclType; 10300 10301 InitializedEntity entity = 10302 InitializedEntity::InitializeVariable(ExDecl); 10303 InitializationKind initKind = 10304 InitializationKind::CreateCopy(Loc, SourceLocation()); 10305 10306 Expr *opaqueValue = 10307 new (Context) OpaqueValueExpr(Loc, initType, VK_LValue, OK_Ordinary); 10308 InitializationSequence sequence(*this, entity, initKind, &opaqueValue, 1); 10309 ExprResult result = sequence.Perform(*this, entity, initKind, 10310 MultiExprArg(&opaqueValue, 1)); 10311 if (result.isInvalid()) 10312 Invalid = true; 10313 else { 10314 // If the constructor used was non-trivial, set this as the 10315 // "initializer". 10316 CXXConstructExpr *construct = cast<CXXConstructExpr>(result.take()); 10317 if (!construct->getConstructor()->isTrivial()) { 10318 Expr *init = MaybeCreateExprWithCleanups(construct); 10319 ExDecl->setInit(init); 10320 } 10321 10322 // And make sure it's destructable. 10323 FinalizeVarWithDestructor(ExDecl, recordType); 10324 } 10325 } 10326 } 10327 10328 if (Invalid) 10329 ExDecl->setInvalidDecl(); 10330 10331 return ExDecl; 10332} 10333 10334/// ActOnExceptionDeclarator - Parsed the exception-declarator in a C++ catch 10335/// handler. 10336Decl *Sema::ActOnExceptionDeclarator(Scope *S, Declarator &D) { 10337 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10338 bool Invalid = D.isInvalidType(); 10339 10340 // Check for unexpanded parameter packs. 10341 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 10342 UPPC_ExceptionType)) { 10343 TInfo = Context.getTrivialTypeSourceInfo(Context.IntTy, 10344 D.getIdentifierLoc()); 10345 Invalid = true; 10346 } 10347 10348 IdentifierInfo *II = D.getIdentifier(); 10349 if (NamedDecl *PrevDecl = LookupSingleName(S, II, D.getIdentifierLoc(), 10350 LookupOrdinaryName, 10351 ForRedeclaration)) { 10352 // The scope should be freshly made just for us. There is just no way 10353 // it contains any previous declaration. 10354 assert(!S->isDeclScope(PrevDecl)); 10355 if (PrevDecl->isTemplateParameter()) { 10356 // Maybe we will complain about the shadowed template parameter. 10357 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 10358 PrevDecl = 0; 10359 } 10360 } 10361 10362 if (D.getCXXScopeSpec().isSet() && !Invalid) { 10363 Diag(D.getIdentifierLoc(), diag::err_qualified_catch_declarator) 10364 << D.getCXXScopeSpec().getRange(); 10365 Invalid = true; 10366 } 10367 10368 VarDecl *ExDecl = BuildExceptionDeclaration(S, TInfo, 10369 D.getLocStart(), 10370 D.getIdentifierLoc(), 10371 D.getIdentifier()); 10372 if (Invalid) 10373 ExDecl->setInvalidDecl(); 10374 10375 // Add the exception declaration into this scope. 10376 if (II) 10377 PushOnScopeChains(ExDecl, S); 10378 else 10379 CurContext->addDecl(ExDecl); 10380 10381 ProcessDeclAttributes(S, ExDecl, D); 10382 return ExDecl; 10383} 10384 10385Decl *Sema::ActOnStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10386 Expr *AssertExpr, 10387 Expr *AssertMessageExpr, 10388 SourceLocation RParenLoc) { 10389 StringLiteral *AssertMessage = cast<StringLiteral>(AssertMessageExpr); 10390 10391 if (DiagnoseUnexpandedParameterPack(AssertExpr, UPPC_StaticAssertExpression)) 10392 return 0; 10393 10394 return BuildStaticAssertDeclaration(StaticAssertLoc, AssertExpr, 10395 AssertMessage, RParenLoc, false); 10396} 10397 10398Decl *Sema::BuildStaticAssertDeclaration(SourceLocation StaticAssertLoc, 10399 Expr *AssertExpr, 10400 StringLiteral *AssertMessage, 10401 SourceLocation RParenLoc, 10402 bool Failed) { 10403 if (!AssertExpr->isTypeDependent() && !AssertExpr->isValueDependent() && 10404 !Failed) { 10405 // In a static_assert-declaration, the constant-expression shall be a 10406 // constant expression that can be contextually converted to bool. 10407 ExprResult Converted = PerformContextuallyConvertToBool(AssertExpr); 10408 if (Converted.isInvalid()) 10409 Failed = true; 10410 10411 llvm::APSInt Cond; 10412 if (!Failed && VerifyIntegerConstantExpression(Converted.get(), &Cond, 10413 diag::err_static_assert_expression_is_not_constant, 10414 /*AllowFold=*/false).isInvalid()) 10415 Failed = true; 10416 10417 if (!Failed && !Cond) { 10418 SmallString<256> MsgBuffer; 10419 llvm::raw_svector_ostream Msg(MsgBuffer); 10420 AssertMessage->printPretty(Msg, 0, getPrintingPolicy()); 10421 Diag(StaticAssertLoc, diag::err_static_assert_failed) 10422 << Msg.str() << AssertExpr->getSourceRange(); 10423 Failed = true; 10424 } 10425 } 10426 10427 Decl *Decl = StaticAssertDecl::Create(Context, CurContext, StaticAssertLoc, 10428 AssertExpr, AssertMessage, RParenLoc, 10429 Failed); 10430 10431 CurContext->addDecl(Decl); 10432 return Decl; 10433} 10434 10435/// \brief Perform semantic analysis of the given friend type declaration. 10436/// 10437/// \returns A friend declaration that. 10438FriendDecl *Sema::CheckFriendTypeDecl(SourceLocation LocStart, 10439 SourceLocation FriendLoc, 10440 TypeSourceInfo *TSInfo) { 10441 assert(TSInfo && "NULL TypeSourceInfo for friend type declaration"); 10442 10443 QualType T = TSInfo->getType(); 10444 SourceRange TypeRange = TSInfo->getTypeLoc().getLocalSourceRange(); 10445 10446 // C++03 [class.friend]p2: 10447 // An elaborated-type-specifier shall be used in a friend declaration 10448 // for a class.* 10449 // 10450 // * The class-key of the elaborated-type-specifier is required. 10451 if (!ActiveTemplateInstantiations.empty()) { 10452 // Do not complain about the form of friend template types during 10453 // template instantiation; we will already have complained when the 10454 // template was declared. 10455 } else { 10456 if (!T->isElaboratedTypeSpecifier()) { 10457 // If we evaluated the type to a record type, suggest putting 10458 // a tag in front. 10459 if (const RecordType *RT = T->getAs<RecordType>()) { 10460 RecordDecl *RD = RT->getDecl(); 10461 10462 std::string InsertionText = std::string(" ") + RD->getKindName(); 10463 10464 Diag(TypeRange.getBegin(), 10465 getLangOpts().CPlusPlus11 ? 10466 diag::warn_cxx98_compat_unelaborated_friend_type : 10467 diag::ext_unelaborated_friend_type) 10468 << (unsigned) RD->getTagKind() 10469 << T 10470 << FixItHint::CreateInsertion(PP.getLocForEndOfToken(FriendLoc), 10471 InsertionText); 10472 } else { 10473 Diag(FriendLoc, 10474 getLangOpts().CPlusPlus11 ? 10475 diag::warn_cxx98_compat_nonclass_type_friend : 10476 diag::ext_nonclass_type_friend) 10477 << T 10478 << TypeRange; 10479 } 10480 } else if (T->getAs<EnumType>()) { 10481 Diag(FriendLoc, 10482 getLangOpts().CPlusPlus11 ? 10483 diag::warn_cxx98_compat_enum_friend : 10484 diag::ext_enum_friend) 10485 << T 10486 << TypeRange; 10487 } 10488 10489 // C++11 [class.friend]p3: 10490 // A friend declaration that does not declare a function shall have one 10491 // of the following forms: 10492 // friend elaborated-type-specifier ; 10493 // friend simple-type-specifier ; 10494 // friend typename-specifier ; 10495 if (getLangOpts().CPlusPlus11 && LocStart != FriendLoc) 10496 Diag(FriendLoc, diag::err_friend_not_first_in_declaration) << T; 10497 } 10498 10499 // If the type specifier in a friend declaration designates a (possibly 10500 // cv-qualified) class type, that class is declared as a friend; otherwise, 10501 // the friend declaration is ignored. 10502 return FriendDecl::Create(Context, CurContext, LocStart, TSInfo, FriendLoc); 10503} 10504 10505/// Handle a friend tag declaration where the scope specifier was 10506/// templated. 10507Decl *Sema::ActOnTemplatedFriendTag(Scope *S, SourceLocation FriendLoc, 10508 unsigned TagSpec, SourceLocation TagLoc, 10509 CXXScopeSpec &SS, 10510 IdentifierInfo *Name, 10511 SourceLocation NameLoc, 10512 AttributeList *Attr, 10513 MultiTemplateParamsArg TempParamLists) { 10514 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 10515 10516 bool isExplicitSpecialization = false; 10517 bool Invalid = false; 10518 10519 if (TemplateParameterList *TemplateParams 10520 = MatchTemplateParametersToScopeSpecifier(TagLoc, NameLoc, SS, 10521 TempParamLists.data(), 10522 TempParamLists.size(), 10523 /*friend*/ true, 10524 isExplicitSpecialization, 10525 Invalid)) { 10526 if (TemplateParams->size() > 0) { 10527 // This is a declaration of a class template. 10528 if (Invalid) 10529 return 0; 10530 10531 return CheckClassTemplate(S, TagSpec, TUK_Friend, TagLoc, 10532 SS, Name, NameLoc, Attr, 10533 TemplateParams, AS_public, 10534 /*ModulePrivateLoc=*/SourceLocation(), 10535 TempParamLists.size() - 1, 10536 TempParamLists.data()).take(); 10537 } else { 10538 // The "template<>" header is extraneous. 10539 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 10540 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 10541 isExplicitSpecialization = true; 10542 } 10543 } 10544 10545 if (Invalid) return 0; 10546 10547 bool isAllExplicitSpecializations = true; 10548 for (unsigned I = TempParamLists.size(); I-- > 0; ) { 10549 if (TempParamLists[I]->size()) { 10550 isAllExplicitSpecializations = false; 10551 break; 10552 } 10553 } 10554 10555 // FIXME: don't ignore attributes. 10556 10557 // If it's explicit specializations all the way down, just forget 10558 // about the template header and build an appropriate non-templated 10559 // friend. TODO: for source fidelity, remember the headers. 10560 if (isAllExplicitSpecializations) { 10561 if (SS.isEmpty()) { 10562 bool Owned = false; 10563 bool IsDependent = false; 10564 return ActOnTag(S, TagSpec, TUK_Friend, TagLoc, SS, Name, NameLoc, 10565 Attr, AS_public, 10566 /*ModulePrivateLoc=*/SourceLocation(), 10567 MultiTemplateParamsArg(), Owned, IsDependent, 10568 /*ScopedEnumKWLoc=*/SourceLocation(), 10569 /*ScopedEnumUsesClassTag=*/false, 10570 /*UnderlyingType=*/TypeResult()); 10571 } 10572 10573 NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); 10574 ElaboratedTypeKeyword Keyword 10575 = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10576 QualType T = CheckTypenameType(Keyword, TagLoc, QualifierLoc, 10577 *Name, NameLoc); 10578 if (T.isNull()) 10579 return 0; 10580 10581 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10582 if (isa<DependentNameType>(T)) { 10583 DependentNameTypeLoc TL = 10584 TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10585 TL.setElaboratedKeywordLoc(TagLoc); 10586 TL.setQualifierLoc(QualifierLoc); 10587 TL.setNameLoc(NameLoc); 10588 } else { 10589 ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); 10590 TL.setElaboratedKeywordLoc(TagLoc); 10591 TL.setQualifierLoc(QualifierLoc); 10592 TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(NameLoc); 10593 } 10594 10595 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10596 TSI, FriendLoc, TempParamLists); 10597 Friend->setAccess(AS_public); 10598 CurContext->addDecl(Friend); 10599 return Friend; 10600 } 10601 10602 assert(SS.isNotEmpty() && "valid templated tag with no SS and no direct?"); 10603 10604 10605 10606 // Handle the case of a templated-scope friend class. e.g. 10607 // template <class T> class A<T>::B; 10608 // FIXME: we don't support these right now. 10609 ElaboratedTypeKeyword ETK = TypeWithKeyword::getKeywordForTagTypeKind(Kind); 10610 QualType T = Context.getDependentNameType(ETK, SS.getScopeRep(), Name); 10611 TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); 10612 DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); 10613 TL.setElaboratedKeywordLoc(TagLoc); 10614 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 10615 TL.setNameLoc(NameLoc); 10616 10617 FriendDecl *Friend = FriendDecl::Create(Context, CurContext, NameLoc, 10618 TSI, FriendLoc, TempParamLists); 10619 Friend->setAccess(AS_public); 10620 Friend->setUnsupportedFriend(true); 10621 CurContext->addDecl(Friend); 10622 return Friend; 10623} 10624 10625 10626/// Handle a friend type declaration. This works in tandem with 10627/// ActOnTag. 10628/// 10629/// Notes on friend class templates: 10630/// 10631/// We generally treat friend class declarations as if they were 10632/// declaring a class. So, for example, the elaborated type specifier 10633/// in a friend declaration is required to obey the restrictions of a 10634/// class-head (i.e. no typedefs in the scope chain), template 10635/// parameters are required to match up with simple template-ids, &c. 10636/// However, unlike when declaring a template specialization, it's 10637/// okay to refer to a template specialization without an empty 10638/// template parameter declaration, e.g. 10639/// friend class A<T>::B<unsigned>; 10640/// We permit this as a special case; if there are any template 10641/// parameters present at all, require proper matching, i.e. 10642/// template <> template \<class T> friend class A<int>::B; 10643Decl *Sema::ActOnFriendTypeDecl(Scope *S, const DeclSpec &DS, 10644 MultiTemplateParamsArg TempParams) { 10645 SourceLocation Loc = DS.getLocStart(); 10646 10647 assert(DS.isFriendSpecified()); 10648 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10649 10650 // Try to convert the decl specifier to a type. This works for 10651 // friend templates because ActOnTag never produces a ClassTemplateDecl 10652 // for a TUK_Friend. 10653 Declarator TheDeclarator(DS, Declarator::MemberContext); 10654 TypeSourceInfo *TSI = GetTypeForDeclarator(TheDeclarator, S); 10655 QualType T = TSI->getType(); 10656 if (TheDeclarator.isInvalidType()) 10657 return 0; 10658 10659 if (DiagnoseUnexpandedParameterPack(Loc, TSI, UPPC_FriendDeclaration)) 10660 return 0; 10661 10662 // This is definitely an error in C++98. It's probably meant to 10663 // be forbidden in C++0x, too, but the specification is just 10664 // poorly written. 10665 // 10666 // The problem is with declarations like the following: 10667 // template <T> friend A<T>::foo; 10668 // where deciding whether a class C is a friend or not now hinges 10669 // on whether there exists an instantiation of A that causes 10670 // 'foo' to equal C. There are restrictions on class-heads 10671 // (which we declare (by fiat) elaborated friend declarations to 10672 // be) that makes this tractable. 10673 // 10674 // FIXME: handle "template <> friend class A<T>;", which 10675 // is possibly well-formed? Who even knows? 10676 if (TempParams.size() && !T->isElaboratedTypeSpecifier()) { 10677 Diag(Loc, diag::err_tagless_friend_type_template) 10678 << DS.getSourceRange(); 10679 return 0; 10680 } 10681 10682 // C++98 [class.friend]p1: A friend of a class is a function 10683 // or class that is not a member of the class . . . 10684 // This is fixed in DR77, which just barely didn't make the C++03 10685 // deadline. It's also a very silly restriction that seriously 10686 // affects inner classes and which nobody else seems to implement; 10687 // thus we never diagnose it, not even in -pedantic. 10688 // 10689 // But note that we could warn about it: it's always useless to 10690 // friend one of your own members (it's not, however, worthless to 10691 // friend a member of an arbitrary specialization of your template). 10692 10693 Decl *D; 10694 if (unsigned NumTempParamLists = TempParams.size()) 10695 D = FriendTemplateDecl::Create(Context, CurContext, Loc, 10696 NumTempParamLists, 10697 TempParams.data(), 10698 TSI, 10699 DS.getFriendSpecLoc()); 10700 else 10701 D = CheckFriendTypeDecl(Loc, DS.getFriendSpecLoc(), TSI); 10702 10703 if (!D) 10704 return 0; 10705 10706 D->setAccess(AS_public); 10707 CurContext->addDecl(D); 10708 10709 return D; 10710} 10711 10712NamedDecl *Sema::ActOnFriendFunctionDecl(Scope *S, Declarator &D, 10713 MultiTemplateParamsArg TemplateParams) { 10714 const DeclSpec &DS = D.getDeclSpec(); 10715 10716 assert(DS.isFriendSpecified()); 10717 assert(DS.getStorageClassSpec() == DeclSpec::SCS_unspecified); 10718 10719 SourceLocation Loc = D.getIdentifierLoc(); 10720 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 10721 10722 // C++ [class.friend]p1 10723 // A friend of a class is a function or class.... 10724 // Note that this sees through typedefs, which is intended. 10725 // It *doesn't* see through dependent types, which is correct 10726 // according to [temp.arg.type]p3: 10727 // If a declaration acquires a function type through a 10728 // type dependent on a template-parameter and this causes 10729 // a declaration that does not use the syntactic form of a 10730 // function declarator to have a function type, the program 10731 // is ill-formed. 10732 if (!TInfo->getType()->isFunctionType()) { 10733 Diag(Loc, diag::err_unexpected_friend); 10734 10735 // It might be worthwhile to try to recover by creating an 10736 // appropriate declaration. 10737 return 0; 10738 } 10739 10740 // C++ [namespace.memdef]p3 10741 // - If a friend declaration in a non-local class first declares a 10742 // class or function, the friend class or function is a member 10743 // of the innermost enclosing namespace. 10744 // - The name of the friend is not found by simple name lookup 10745 // until a matching declaration is provided in that namespace 10746 // scope (either before or after the class declaration granting 10747 // friendship). 10748 // - If a friend function is called, its name may be found by the 10749 // name lookup that considers functions from namespaces and 10750 // classes associated with the types of the function arguments. 10751 // - When looking for a prior declaration of a class or a function 10752 // declared as a friend, scopes outside the innermost enclosing 10753 // namespace scope are not considered. 10754 10755 CXXScopeSpec &SS = D.getCXXScopeSpec(); 10756 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 10757 DeclarationName Name = NameInfo.getName(); 10758 assert(Name); 10759 10760 // Check for unexpanded parameter packs. 10761 if (DiagnoseUnexpandedParameterPack(Loc, TInfo, UPPC_FriendDeclaration) || 10762 DiagnoseUnexpandedParameterPack(NameInfo, UPPC_FriendDeclaration) || 10763 DiagnoseUnexpandedParameterPack(SS, UPPC_FriendDeclaration)) 10764 return 0; 10765 10766 // The context we found the declaration in, or in which we should 10767 // create the declaration. 10768 DeclContext *DC; 10769 Scope *DCScope = S; 10770 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 10771 ForRedeclaration); 10772 10773 // FIXME: there are different rules in local classes 10774 10775 // There are four cases here. 10776 // - There's no scope specifier, in which case we just go to the 10777 // appropriate scope and look for a function or function template 10778 // there as appropriate. 10779 // Recover from invalid scope qualifiers as if they just weren't there. 10780 if (SS.isInvalid() || !SS.isSet()) { 10781 // C++0x [namespace.memdef]p3: 10782 // If the name in a friend declaration is neither qualified nor 10783 // a template-id and the declaration is a function or an 10784 // elaborated-type-specifier, the lookup to determine whether 10785 // the entity has been previously declared shall not consider 10786 // any scopes outside the innermost enclosing namespace. 10787 // C++0x [class.friend]p11: 10788 // If a friend declaration appears in a local class and the name 10789 // specified is an unqualified name, a prior declaration is 10790 // looked up without considering scopes that are outside the 10791 // innermost enclosing non-class scope. For a friend function 10792 // declaration, if there is no prior declaration, the program is 10793 // ill-formed. 10794 bool isLocal = cast<CXXRecordDecl>(CurContext)->isLocalClass(); 10795 bool isTemplateId = D.getName().getKind() == UnqualifiedId::IK_TemplateId; 10796 10797 // Find the appropriate context according to the above. 10798 DC = CurContext; 10799 while (true) { 10800 // Skip class contexts. If someone can cite chapter and verse 10801 // for this behavior, that would be nice --- it's what GCC and 10802 // EDG do, and it seems like a reasonable intent, but the spec 10803 // really only says that checks for unqualified existing 10804 // declarations should stop at the nearest enclosing namespace, 10805 // not that they should only consider the nearest enclosing 10806 // namespace. 10807 while (DC->isRecord() || DC->isTransparentContext()) 10808 DC = DC->getParent(); 10809 10810 LookupQualifiedName(Previous, DC); 10811 10812 // TODO: decide what we think about using declarations. 10813 if (isLocal || !Previous.empty()) 10814 break; 10815 10816 if (isTemplateId) { 10817 if (isa<TranslationUnitDecl>(DC)) break; 10818 } else { 10819 if (DC->isFileContext()) break; 10820 } 10821 DC = DC->getParent(); 10822 } 10823 10824 DCScope = getScopeForDeclContext(S, DC); 10825 10826 // C++ [class.friend]p6: 10827 // A function can be defined in a friend declaration of a class if and 10828 // only if the class is a non-local class (9.8), the function name is 10829 // unqualified, and the function has namespace scope. 10830 if (isLocal && D.isFunctionDefinition()) { 10831 Diag(NameInfo.getBeginLoc(), diag::err_friend_def_in_local_class); 10832 } 10833 10834 // - There's a non-dependent scope specifier, in which case we 10835 // compute it and do a previous lookup there for a function 10836 // or function template. 10837 } else if (!SS.getScopeRep()->isDependent()) { 10838 DC = computeDeclContext(SS); 10839 if (!DC) return 0; 10840 10841 if (RequireCompleteDeclContext(SS, DC)) return 0; 10842 10843 LookupQualifiedName(Previous, DC); 10844 10845 // Ignore things found implicitly in the wrong scope. 10846 // TODO: better diagnostics for this case. Suggesting the right 10847 // qualified scope would be nice... 10848 LookupResult::Filter F = Previous.makeFilter(); 10849 while (F.hasNext()) { 10850 NamedDecl *D = F.next(); 10851 if (!DC->InEnclosingNamespaceSetOf( 10852 D->getDeclContext()->getRedeclContext())) 10853 F.erase(); 10854 } 10855 F.done(); 10856 10857 if (Previous.empty()) { 10858 D.setInvalidType(); 10859 Diag(Loc, diag::err_qualified_friend_not_found) 10860 << Name << TInfo->getType(); 10861 return 0; 10862 } 10863 10864 // C++ [class.friend]p1: A friend of a class is a function or 10865 // class that is not a member of the class . . . 10866 if (DC->Equals(CurContext)) 10867 Diag(DS.getFriendSpecLoc(), 10868 getLangOpts().CPlusPlus11 ? 10869 diag::warn_cxx98_compat_friend_is_member : 10870 diag::err_friend_is_member); 10871 10872 if (D.isFunctionDefinition()) { 10873 // C++ [class.friend]p6: 10874 // A function can be defined in a friend declaration of a class if and 10875 // only if the class is a non-local class (9.8), the function name is 10876 // unqualified, and the function has namespace scope. 10877 SemaDiagnosticBuilder DB 10878 = Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def); 10879 10880 DB << SS.getScopeRep(); 10881 if (DC->isFileContext()) 10882 DB << FixItHint::CreateRemoval(SS.getRange()); 10883 SS.clear(); 10884 } 10885 10886 // - There's a scope specifier that does not match any template 10887 // parameter lists, in which case we use some arbitrary context, 10888 // create a method or method template, and wait for instantiation. 10889 // - There's a scope specifier that does match some template 10890 // parameter lists, which we don't handle right now. 10891 } else { 10892 if (D.isFunctionDefinition()) { 10893 // C++ [class.friend]p6: 10894 // A function can be defined in a friend declaration of a class if and 10895 // only if the class is a non-local class (9.8), the function name is 10896 // unqualified, and the function has namespace scope. 10897 Diag(SS.getRange().getBegin(), diag::err_qualified_friend_def) 10898 << SS.getScopeRep(); 10899 } 10900 10901 DC = CurContext; 10902 assert(isa<CXXRecordDecl>(DC) && "friend declaration not in class?"); 10903 } 10904 10905 if (!DC->isRecord()) { 10906 // This implies that it has to be an operator or function. 10907 if (D.getName().getKind() == UnqualifiedId::IK_ConstructorName || 10908 D.getName().getKind() == UnqualifiedId::IK_DestructorName || 10909 D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) { 10910 Diag(Loc, diag::err_introducing_special_friend) << 10911 (D.getName().getKind() == UnqualifiedId::IK_ConstructorName ? 0 : 10912 D.getName().getKind() == UnqualifiedId::IK_DestructorName ? 1 : 2); 10913 return 0; 10914 } 10915 } 10916 10917 // FIXME: This is an egregious hack to cope with cases where the scope stack 10918 // does not contain the declaration context, i.e., in an out-of-line 10919 // definition of a class. 10920 Scope FakeDCScope(S, Scope::DeclScope, Diags); 10921 if (!DCScope) { 10922 FakeDCScope.setEntity(DC); 10923 DCScope = &FakeDCScope; 10924 } 10925 10926 bool AddToScope = true; 10927 NamedDecl *ND = ActOnFunctionDeclarator(DCScope, D, DC, TInfo, Previous, 10928 TemplateParams, AddToScope); 10929 if (!ND) return 0; 10930 10931 assert(ND->getDeclContext() == DC); 10932 assert(ND->getLexicalDeclContext() == CurContext); 10933 10934 // Add the function declaration to the appropriate lookup tables, 10935 // adjusting the redeclarations list as necessary. We don't 10936 // want to do this yet if the friending class is dependent. 10937 // 10938 // Also update the scope-based lookup if the target context's 10939 // lookup context is in lexical scope. 10940 if (!CurContext->isDependentContext()) { 10941 DC = DC->getRedeclContext(); 10942 DC->makeDeclVisibleInContext(ND); 10943 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 10944 PushOnScopeChains(ND, EnclosingScope, /*AddToContext=*/ false); 10945 } 10946 10947 FriendDecl *FrD = FriendDecl::Create(Context, CurContext, 10948 D.getIdentifierLoc(), ND, 10949 DS.getFriendSpecLoc()); 10950 FrD->setAccess(AS_public); 10951 CurContext->addDecl(FrD); 10952 10953 if (ND->isInvalidDecl()) { 10954 FrD->setInvalidDecl(); 10955 } else { 10956 if (DC->isRecord()) CheckFriendAccess(ND); 10957 10958 FunctionDecl *FD; 10959 if (FunctionTemplateDecl *FTD = dyn_cast<FunctionTemplateDecl>(ND)) 10960 FD = FTD->getTemplatedDecl(); 10961 else 10962 FD = cast<FunctionDecl>(ND); 10963 10964 // Mark templated-scope function declarations as unsupported. 10965 if (FD->getNumTemplateParameterLists()) 10966 FrD->setUnsupportedFriend(true); 10967 } 10968 10969 return ND; 10970} 10971 10972void Sema::SetDeclDeleted(Decl *Dcl, SourceLocation DelLoc) { 10973 AdjustDeclIfTemplate(Dcl); 10974 10975 FunctionDecl *Fn = dyn_cast_or_null<FunctionDecl>(Dcl); 10976 if (!Fn) { 10977 Diag(DelLoc, diag::err_deleted_non_function); 10978 return; 10979 } 10980 if (const FunctionDecl *Prev = Fn->getPreviousDecl()) { 10981 // Don't consider the implicit declaration we generate for explicit 10982 // specializations. FIXME: Do not generate these implicit declarations. 10983 if ((Prev->getTemplateSpecializationKind() != TSK_ExplicitSpecialization 10984 || Prev->getPreviousDecl()) && !Prev->isDefined()) { 10985 Diag(DelLoc, diag::err_deleted_decl_not_first); 10986 Diag(Prev->getLocation(), diag::note_previous_declaration); 10987 } 10988 // If the declaration wasn't the first, we delete the function anyway for 10989 // recovery. 10990 } 10991 Fn->setDeletedAsWritten(); 10992} 10993 10994void Sema::SetDeclDefaulted(Decl *Dcl, SourceLocation DefaultLoc) { 10995 CXXMethodDecl *MD = dyn_cast_or_null<CXXMethodDecl>(Dcl); 10996 10997 if (MD) { 10998 if (MD->getParent()->isDependentType()) { 10999 MD->setDefaulted(); 11000 MD->setExplicitlyDefaulted(); 11001 return; 11002 } 11003 11004 CXXSpecialMember Member = getSpecialMember(MD); 11005 if (Member == CXXInvalid) { 11006 Diag(DefaultLoc, diag::err_default_special_members); 11007 return; 11008 } 11009 11010 MD->setDefaulted(); 11011 MD->setExplicitlyDefaulted(); 11012 11013 // If this definition appears within the record, do the checking when 11014 // the record is complete. 11015 const FunctionDecl *Primary = MD; 11016 if (const FunctionDecl *Pattern = MD->getTemplateInstantiationPattern()) 11017 // Find the uninstantiated declaration that actually had the '= default' 11018 // on it. 11019 Pattern->isDefined(Primary); 11020 11021 if (Primary == Primary->getCanonicalDecl()) 11022 return; 11023 11024 CheckExplicitlyDefaultedSpecialMember(MD); 11025 11026 // The exception specification is needed because we are defining the 11027 // function. 11028 ResolveExceptionSpec(DefaultLoc, 11029 MD->getType()->castAs<FunctionProtoType>()); 11030 11031 switch (Member) { 11032 case CXXDefaultConstructor: { 11033 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11034 if (!CD->isInvalidDecl()) 11035 DefineImplicitDefaultConstructor(DefaultLoc, CD); 11036 break; 11037 } 11038 11039 case CXXCopyConstructor: { 11040 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11041 if (!CD->isInvalidDecl()) 11042 DefineImplicitCopyConstructor(DefaultLoc, CD); 11043 break; 11044 } 11045 11046 case CXXCopyAssignment: { 11047 if (!MD->isInvalidDecl()) 11048 DefineImplicitCopyAssignment(DefaultLoc, MD); 11049 break; 11050 } 11051 11052 case CXXDestructor: { 11053 CXXDestructorDecl *DD = cast<CXXDestructorDecl>(MD); 11054 if (!DD->isInvalidDecl()) 11055 DefineImplicitDestructor(DefaultLoc, DD); 11056 break; 11057 } 11058 11059 case CXXMoveConstructor: { 11060 CXXConstructorDecl *CD = cast<CXXConstructorDecl>(MD); 11061 if (!CD->isInvalidDecl()) 11062 DefineImplicitMoveConstructor(DefaultLoc, CD); 11063 break; 11064 } 11065 11066 case CXXMoveAssignment: { 11067 if (!MD->isInvalidDecl()) 11068 DefineImplicitMoveAssignment(DefaultLoc, MD); 11069 break; 11070 } 11071 11072 case CXXInvalid: 11073 llvm_unreachable("Invalid special member."); 11074 } 11075 } else { 11076 Diag(DefaultLoc, diag::err_default_special_members); 11077 } 11078} 11079 11080static void SearchForReturnInStmt(Sema &Self, Stmt *S) { 11081 for (Stmt::child_range CI = S->children(); CI; ++CI) { 11082 Stmt *SubStmt = *CI; 11083 if (!SubStmt) 11084 continue; 11085 if (isa<ReturnStmt>(SubStmt)) 11086 Self.Diag(SubStmt->getLocStart(), 11087 diag::err_return_in_constructor_handler); 11088 if (!isa<Expr>(SubStmt)) 11089 SearchForReturnInStmt(Self, SubStmt); 11090 } 11091} 11092 11093void Sema::DiagnoseReturnInConstructorExceptionHandler(CXXTryStmt *TryBlock) { 11094 for (unsigned I = 0, E = TryBlock->getNumHandlers(); I != E; ++I) { 11095 CXXCatchStmt *Handler = TryBlock->getHandler(I); 11096 SearchForReturnInStmt(*this, Handler); 11097 } 11098} 11099 11100bool Sema::CheckOverridingFunctionAttributes(const CXXMethodDecl *New, 11101 const CXXMethodDecl *Old) { 11102 const FunctionType *NewFT = New->getType()->getAs<FunctionType>(); 11103 const FunctionType *OldFT = Old->getType()->getAs<FunctionType>(); 11104 11105 CallingConv NewCC = NewFT->getCallConv(), OldCC = OldFT->getCallConv(); 11106 11107 // If the calling conventions match, everything is fine 11108 if (NewCC == OldCC) 11109 return false; 11110 11111 // If either of the calling conventions are set to "default", we need to pick 11112 // something more sensible based on the target. This supports code where the 11113 // one method explicitly sets thiscall, and another has no explicit calling 11114 // convention. 11115 CallingConv Default = 11116 Context.getTargetInfo().getDefaultCallingConv(TargetInfo::CCMT_Member); 11117 if (NewCC == CC_Default) 11118 NewCC = Default; 11119 if (OldCC == CC_Default) 11120 OldCC = Default; 11121 11122 // If the calling conventions still don't match, then report the error 11123 if (NewCC != OldCC) { 11124 Diag(New->getLocation(), 11125 diag::err_conflicting_overriding_cc_attributes) 11126 << New->getDeclName() << New->getType() << Old->getType(); 11127 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11128 return true; 11129 } 11130 11131 return false; 11132} 11133 11134bool Sema::CheckOverridingFunctionReturnType(const CXXMethodDecl *New, 11135 const CXXMethodDecl *Old) { 11136 QualType NewTy = New->getType()->getAs<FunctionType>()->getResultType(); 11137 QualType OldTy = Old->getType()->getAs<FunctionType>()->getResultType(); 11138 11139 if (Context.hasSameType(NewTy, OldTy) || 11140 NewTy->isDependentType() || OldTy->isDependentType()) 11141 return false; 11142 11143 // Check if the return types are covariant 11144 QualType NewClassTy, OldClassTy; 11145 11146 /// Both types must be pointers or references to classes. 11147 if (const PointerType *NewPT = NewTy->getAs<PointerType>()) { 11148 if (const PointerType *OldPT = OldTy->getAs<PointerType>()) { 11149 NewClassTy = NewPT->getPointeeType(); 11150 OldClassTy = OldPT->getPointeeType(); 11151 } 11152 } else if (const ReferenceType *NewRT = NewTy->getAs<ReferenceType>()) { 11153 if (const ReferenceType *OldRT = OldTy->getAs<ReferenceType>()) { 11154 if (NewRT->getTypeClass() == OldRT->getTypeClass()) { 11155 NewClassTy = NewRT->getPointeeType(); 11156 OldClassTy = OldRT->getPointeeType(); 11157 } 11158 } 11159 } 11160 11161 // The return types aren't either both pointers or references to a class type. 11162 if (NewClassTy.isNull()) { 11163 Diag(New->getLocation(), 11164 diag::err_different_return_type_for_overriding_virtual_function) 11165 << New->getDeclName() << NewTy << OldTy; 11166 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11167 11168 return true; 11169 } 11170 11171 // C++ [class.virtual]p6: 11172 // If the return type of D::f differs from the return type of B::f, the 11173 // class type in the return type of D::f shall be complete at the point of 11174 // declaration of D::f or shall be the class type D. 11175 if (const RecordType *RT = NewClassTy->getAs<RecordType>()) { 11176 if (!RT->isBeingDefined() && 11177 RequireCompleteType(New->getLocation(), NewClassTy, 11178 diag::err_covariant_return_incomplete, 11179 New->getDeclName())) 11180 return true; 11181 } 11182 11183 if (!Context.hasSameUnqualifiedType(NewClassTy, OldClassTy)) { 11184 // Check if the new class derives from the old class. 11185 if (!IsDerivedFrom(NewClassTy, OldClassTy)) { 11186 Diag(New->getLocation(), 11187 diag::err_covariant_return_not_derived) 11188 << New->getDeclName() << NewTy << OldTy; 11189 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11190 return true; 11191 } 11192 11193 // Check if we the conversion from derived to base is valid. 11194 if (CheckDerivedToBaseConversion(NewClassTy, OldClassTy, 11195 diag::err_covariant_return_inaccessible_base, 11196 diag::err_covariant_return_ambiguous_derived_to_base_conv, 11197 // FIXME: Should this point to the return type? 11198 New->getLocation(), SourceRange(), New->getDeclName(), 0)) { 11199 // FIXME: this note won't trigger for delayed access control 11200 // diagnostics, and it's impossible to get an undelayed error 11201 // here from access control during the original parse because 11202 // the ParsingDeclSpec/ParsingDeclarator are still in scope. 11203 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11204 return true; 11205 } 11206 } 11207 11208 // The qualifiers of the return types must be the same. 11209 if (NewTy.getLocalCVRQualifiers() != OldTy.getLocalCVRQualifiers()) { 11210 Diag(New->getLocation(), 11211 diag::err_covariant_return_type_different_qualifications) 11212 << New->getDeclName() << NewTy << OldTy; 11213 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11214 return true; 11215 }; 11216 11217 11218 // The new class type must have the same or less qualifiers as the old type. 11219 if (NewClassTy.isMoreQualifiedThan(OldClassTy)) { 11220 Diag(New->getLocation(), 11221 diag::err_covariant_return_type_class_type_more_qualified) 11222 << New->getDeclName() << NewTy << OldTy; 11223 Diag(Old->getLocation(), diag::note_overridden_virtual_function); 11224 return true; 11225 }; 11226 11227 return false; 11228} 11229 11230/// \brief Mark the given method pure. 11231/// 11232/// \param Method the method to be marked pure. 11233/// 11234/// \param InitRange the source range that covers the "0" initializer. 11235bool Sema::CheckPureMethod(CXXMethodDecl *Method, SourceRange InitRange) { 11236 SourceLocation EndLoc = InitRange.getEnd(); 11237 if (EndLoc.isValid()) 11238 Method->setRangeEnd(EndLoc); 11239 11240 if (Method->isVirtual() || Method->getParent()->isDependentContext()) { 11241 Method->setPure(); 11242 return false; 11243 } 11244 11245 if (!Method->isInvalidDecl()) 11246 Diag(Method->getLocation(), diag::err_non_virtual_pure) 11247 << Method->getDeclName() << InitRange; 11248 return true; 11249} 11250 11251/// \brief Determine whether the given declaration is a static data member. 11252static bool isStaticDataMember(Decl *D) { 11253 VarDecl *Var = dyn_cast_or_null<VarDecl>(D); 11254 if (!Var) 11255 return false; 11256 11257 return Var->isStaticDataMember(); 11258} 11259/// ActOnCXXEnterDeclInitializer - Invoked when we are about to parse 11260/// an initializer for the out-of-line declaration 'Dcl'. The scope 11261/// is a fresh scope pushed for just this purpose. 11262/// 11263/// After this method is called, according to [C++ 3.4.1p13], if 'Dcl' is a 11264/// static data member of class X, names should be looked up in the scope of 11265/// class X. 11266void Sema::ActOnCXXEnterDeclInitializer(Scope *S, Decl *D) { 11267 // If there is no declaration, there was an error parsing it. 11268 if (D == 0 || D->isInvalidDecl()) return; 11269 11270 // We should only get called for declarations with scope specifiers, like: 11271 // int foo::bar; 11272 assert(D->isOutOfLine()); 11273 EnterDeclaratorContext(S, D->getDeclContext()); 11274 11275 // If we are parsing the initializer for a static data member, push a 11276 // new expression evaluation context that is associated with this static 11277 // data member. 11278 if (isStaticDataMember(D)) 11279 PushExpressionEvaluationContext(PotentiallyEvaluated, D); 11280} 11281 11282/// ActOnCXXExitDeclInitializer - Invoked after we are finished parsing an 11283/// initializer for the out-of-line declaration 'D'. 11284void Sema::ActOnCXXExitDeclInitializer(Scope *S, Decl *D) { 11285 // If there is no declaration, there was an error parsing it. 11286 if (D == 0 || D->isInvalidDecl()) return; 11287 11288 if (isStaticDataMember(D)) 11289 PopExpressionEvaluationContext(); 11290 11291 assert(D->isOutOfLine()); 11292 ExitDeclaratorContext(S); 11293} 11294 11295/// ActOnCXXConditionDeclarationExpr - Parsed a condition declaration of a 11296/// C++ if/switch/while/for statement. 11297/// e.g: "if (int x = f()) {...}" 11298DeclResult Sema::ActOnCXXConditionDeclaration(Scope *S, Declarator &D) { 11299 // C++ 6.4p2: 11300 // The declarator shall not specify a function or an array. 11301 // The type-specifier-seq shall not contain typedef and shall not declare a 11302 // new class or enumeration. 11303 assert(D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 11304 "Parser allowed 'typedef' as storage class of condition decl."); 11305 11306 Decl *Dcl = ActOnDeclarator(S, D); 11307 if (!Dcl) 11308 return true; 11309 11310 if (isa<FunctionDecl>(Dcl)) { // The declarator shall not specify a function. 11311 Diag(Dcl->getLocation(), diag::err_invalid_use_of_function_type) 11312 << D.getSourceRange(); 11313 return true; 11314 } 11315 11316 return Dcl; 11317} 11318 11319void Sema::LoadExternalVTableUses() { 11320 if (!ExternalSource) 11321 return; 11322 11323 SmallVector<ExternalVTableUse, 4> VTables; 11324 ExternalSource->ReadUsedVTables(VTables); 11325 SmallVector<VTableUse, 4> NewUses; 11326 for (unsigned I = 0, N = VTables.size(); I != N; ++I) { 11327 llvm::DenseMap<CXXRecordDecl *, bool>::iterator Pos 11328 = VTablesUsed.find(VTables[I].Record); 11329 // Even if a definition wasn't required before, it may be required now. 11330 if (Pos != VTablesUsed.end()) { 11331 if (!Pos->second && VTables[I].DefinitionRequired) 11332 Pos->second = true; 11333 continue; 11334 } 11335 11336 VTablesUsed[VTables[I].Record] = VTables[I].DefinitionRequired; 11337 NewUses.push_back(VTableUse(VTables[I].Record, VTables[I].Location)); 11338 } 11339 11340 VTableUses.insert(VTableUses.begin(), NewUses.begin(), NewUses.end()); 11341} 11342 11343void Sema::MarkVTableUsed(SourceLocation Loc, CXXRecordDecl *Class, 11344 bool DefinitionRequired) { 11345 // Ignore any vtable uses in unevaluated operands or for classes that do 11346 // not have a vtable. 11347 if (!Class->isDynamicClass() || Class->isDependentContext() || 11348 CurContext->isDependentContext() || 11349 ExprEvalContexts.back().Context == Unevaluated) 11350 return; 11351 11352 // Try to insert this class into the map. 11353 LoadExternalVTableUses(); 11354 Class = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11355 std::pair<llvm::DenseMap<CXXRecordDecl *, bool>::iterator, bool> 11356 Pos = VTablesUsed.insert(std::make_pair(Class, DefinitionRequired)); 11357 if (!Pos.second) { 11358 // If we already had an entry, check to see if we are promoting this vtable 11359 // to required a definition. If so, we need to reappend to the VTableUses 11360 // list, since we may have already processed the first entry. 11361 if (DefinitionRequired && !Pos.first->second) { 11362 Pos.first->second = true; 11363 } else { 11364 // Otherwise, we can early exit. 11365 return; 11366 } 11367 } 11368 11369 // Local classes need to have their virtual members marked 11370 // immediately. For all other classes, we mark their virtual members 11371 // at the end of the translation unit. 11372 if (Class->isLocalClass()) 11373 MarkVirtualMembersReferenced(Loc, Class); 11374 else 11375 VTableUses.push_back(std::make_pair(Class, Loc)); 11376} 11377 11378bool Sema::DefineUsedVTables() { 11379 LoadExternalVTableUses(); 11380 if (VTableUses.empty()) 11381 return false; 11382 11383 // Note: The VTableUses vector could grow as a result of marking 11384 // the members of a class as "used", so we check the size each 11385 // time through the loop and prefer indices (which are stable) to 11386 // iterators (which are not). 11387 bool DefinedAnything = false; 11388 for (unsigned I = 0; I != VTableUses.size(); ++I) { 11389 CXXRecordDecl *Class = VTableUses[I].first->getDefinition(); 11390 if (!Class) 11391 continue; 11392 11393 SourceLocation Loc = VTableUses[I].second; 11394 11395 bool DefineVTable = true; 11396 11397 // If this class has a key function, but that key function is 11398 // defined in another translation unit, we don't need to emit the 11399 // vtable even though we're using it. 11400 const CXXMethodDecl *KeyFunction = Context.getCurrentKeyFunction(Class); 11401 if (KeyFunction && !KeyFunction->hasBody()) { 11402 switch (KeyFunction->getTemplateSpecializationKind()) { 11403 case TSK_Undeclared: 11404 case TSK_ExplicitSpecialization: 11405 case TSK_ExplicitInstantiationDeclaration: 11406 // The key function is in another translation unit. 11407 DefineVTable = false; 11408 break; 11409 11410 case TSK_ExplicitInstantiationDefinition: 11411 case TSK_ImplicitInstantiation: 11412 // We will be instantiating the key function. 11413 break; 11414 } 11415 } else if (!KeyFunction) { 11416 // If we have a class with no key function that is the subject 11417 // of an explicit instantiation declaration, suppress the 11418 // vtable; it will live with the explicit instantiation 11419 // definition. 11420 bool IsExplicitInstantiationDeclaration 11421 = Class->getTemplateSpecializationKind() 11422 == TSK_ExplicitInstantiationDeclaration; 11423 for (TagDecl::redecl_iterator R = Class->redecls_begin(), 11424 REnd = Class->redecls_end(); 11425 R != REnd; ++R) { 11426 TemplateSpecializationKind TSK 11427 = cast<CXXRecordDecl>(*R)->getTemplateSpecializationKind(); 11428 if (TSK == TSK_ExplicitInstantiationDeclaration) 11429 IsExplicitInstantiationDeclaration = true; 11430 else if (TSK == TSK_ExplicitInstantiationDefinition) { 11431 IsExplicitInstantiationDeclaration = false; 11432 break; 11433 } 11434 } 11435 11436 if (IsExplicitInstantiationDeclaration) 11437 DefineVTable = false; 11438 } 11439 11440 // The exception specifications for all virtual members may be needed even 11441 // if we are not providing an authoritative form of the vtable in this TU. 11442 // We may choose to emit it available_externally anyway. 11443 if (!DefineVTable) { 11444 MarkVirtualMemberExceptionSpecsNeeded(Loc, Class); 11445 continue; 11446 } 11447 11448 // Mark all of the virtual members of this class as referenced, so 11449 // that we can build a vtable. Then, tell the AST consumer that a 11450 // vtable for this class is required. 11451 DefinedAnything = true; 11452 MarkVirtualMembersReferenced(Loc, Class); 11453 CXXRecordDecl *Canonical = cast<CXXRecordDecl>(Class->getCanonicalDecl()); 11454 Consumer.HandleVTable(Class, VTablesUsed[Canonical]); 11455 11456 // Optionally warn if we're emitting a weak vtable. 11457 if (Class->hasExternalLinkage() && 11458 Class->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) { 11459 const FunctionDecl *KeyFunctionDef = 0; 11460 if (!KeyFunction || 11461 (KeyFunction->hasBody(KeyFunctionDef) && 11462 KeyFunctionDef->isInlined())) 11463 Diag(Class->getLocation(), Class->getTemplateSpecializationKind() == 11464 TSK_ExplicitInstantiationDefinition 11465 ? diag::warn_weak_template_vtable : diag::warn_weak_vtable) 11466 << Class; 11467 } 11468 } 11469 VTableUses.clear(); 11470 11471 return DefinedAnything; 11472} 11473 11474void Sema::MarkVirtualMemberExceptionSpecsNeeded(SourceLocation Loc, 11475 const CXXRecordDecl *RD) { 11476 for (CXXRecordDecl::method_iterator I = RD->method_begin(), 11477 E = RD->method_end(); I != E; ++I) 11478 if ((*I)->isVirtual() && !(*I)->isPure()) 11479 ResolveExceptionSpec(Loc, (*I)->getType()->castAs<FunctionProtoType>()); 11480} 11481 11482void Sema::MarkVirtualMembersReferenced(SourceLocation Loc, 11483 const CXXRecordDecl *RD) { 11484 // Mark all functions which will appear in RD's vtable as used. 11485 CXXFinalOverriderMap FinalOverriders; 11486 RD->getFinalOverriders(FinalOverriders); 11487 for (CXXFinalOverriderMap::const_iterator I = FinalOverriders.begin(), 11488 E = FinalOverriders.end(); 11489 I != E; ++I) { 11490 for (OverridingMethods::const_iterator OI = I->second.begin(), 11491 OE = I->second.end(); 11492 OI != OE; ++OI) { 11493 assert(OI->second.size() > 0 && "no final overrider"); 11494 CXXMethodDecl *Overrider = OI->second.front().Method; 11495 11496 // C++ [basic.def.odr]p2: 11497 // [...] A virtual member function is used if it is not pure. [...] 11498 if (!Overrider->isPure()) 11499 MarkFunctionReferenced(Loc, Overrider); 11500 } 11501 } 11502 11503 // Only classes that have virtual bases need a VTT. 11504 if (RD->getNumVBases() == 0) 11505 return; 11506 11507 for (CXXRecordDecl::base_class_const_iterator i = RD->bases_begin(), 11508 e = RD->bases_end(); i != e; ++i) { 11509 const CXXRecordDecl *Base = 11510 cast<CXXRecordDecl>(i->getType()->getAs<RecordType>()->getDecl()); 11511 if (Base->getNumVBases() == 0) 11512 continue; 11513 MarkVirtualMembersReferenced(Loc, Base); 11514 } 11515} 11516 11517/// SetIvarInitializers - This routine builds initialization ASTs for the 11518/// Objective-C implementation whose ivars need be initialized. 11519void Sema::SetIvarInitializers(ObjCImplementationDecl *ObjCImplementation) { 11520 if (!getLangOpts().CPlusPlus) 11521 return; 11522 if (ObjCInterfaceDecl *OID = ObjCImplementation->getClassInterface()) { 11523 SmallVector<ObjCIvarDecl*, 8> ivars; 11524 CollectIvarsToConstructOrDestruct(OID, ivars); 11525 if (ivars.empty()) 11526 return; 11527 SmallVector<CXXCtorInitializer*, 32> AllToInit; 11528 for (unsigned i = 0; i < ivars.size(); i++) { 11529 FieldDecl *Field = ivars[i]; 11530 if (Field->isInvalidDecl()) 11531 continue; 11532 11533 CXXCtorInitializer *Member; 11534 InitializedEntity InitEntity = InitializedEntity::InitializeMember(Field); 11535 InitializationKind InitKind = 11536 InitializationKind::CreateDefault(ObjCImplementation->getLocation()); 11537 11538 InitializationSequence InitSeq(*this, InitEntity, InitKind, 0, 0); 11539 ExprResult MemberInit = 11540 InitSeq.Perform(*this, InitEntity, InitKind, MultiExprArg()); 11541 MemberInit = MaybeCreateExprWithCleanups(MemberInit); 11542 // Note, MemberInit could actually come back empty if no initialization 11543 // is required (e.g., because it would call a trivial default constructor) 11544 if (!MemberInit.get() || MemberInit.isInvalid()) 11545 continue; 11546 11547 Member = 11548 new (Context) CXXCtorInitializer(Context, Field, SourceLocation(), 11549 SourceLocation(), 11550 MemberInit.takeAs<Expr>(), 11551 SourceLocation()); 11552 AllToInit.push_back(Member); 11553 11554 // Be sure that the destructor is accessible and is marked as referenced. 11555 if (const RecordType *RecordTy 11556 = Context.getBaseElementType(Field->getType()) 11557 ->getAs<RecordType>()) { 11558 CXXRecordDecl *RD = cast<CXXRecordDecl>(RecordTy->getDecl()); 11559 if (CXXDestructorDecl *Destructor = LookupDestructor(RD)) { 11560 MarkFunctionReferenced(Field->getLocation(), Destructor); 11561 CheckDestructorAccess(Field->getLocation(), Destructor, 11562 PDiag(diag::err_access_dtor_ivar) 11563 << Context.getBaseElementType(Field->getType())); 11564 } 11565 } 11566 } 11567 ObjCImplementation->setIvarInitializers(Context, 11568 AllToInit.data(), AllToInit.size()); 11569 } 11570} 11571 11572static 11573void DelegatingCycleHelper(CXXConstructorDecl* Ctor, 11574 llvm::SmallSet<CXXConstructorDecl*, 4> &Valid, 11575 llvm::SmallSet<CXXConstructorDecl*, 4> &Invalid, 11576 llvm::SmallSet<CXXConstructorDecl*, 4> &Current, 11577 Sema &S) { 11578 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11579 CE = Current.end(); 11580 if (Ctor->isInvalidDecl()) 11581 return; 11582 11583 CXXConstructorDecl *Target = Ctor->getTargetConstructor(); 11584 11585 // Target may not be determinable yet, for instance if this is a dependent 11586 // call in an uninstantiated template. 11587 if (Target) { 11588 const FunctionDecl *FNTarget = 0; 11589 (void)Target->hasBody(FNTarget); 11590 Target = const_cast<CXXConstructorDecl*>( 11591 cast_or_null<CXXConstructorDecl>(FNTarget)); 11592 } 11593 11594 CXXConstructorDecl *Canonical = Ctor->getCanonicalDecl(), 11595 // Avoid dereferencing a null pointer here. 11596 *TCanonical = Target ? Target->getCanonicalDecl() : 0; 11597 11598 if (!Current.insert(Canonical)) 11599 return; 11600 11601 // We know that beyond here, we aren't chaining into a cycle. 11602 if (!Target || !Target->isDelegatingConstructor() || 11603 Target->isInvalidDecl() || Valid.count(TCanonical)) { 11604 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11605 Valid.insert(*CI); 11606 Current.clear(); 11607 // We've hit a cycle. 11608 } else if (TCanonical == Canonical || Invalid.count(TCanonical) || 11609 Current.count(TCanonical)) { 11610 // If we haven't diagnosed this cycle yet, do so now. 11611 if (!Invalid.count(TCanonical)) { 11612 S.Diag((*Ctor->init_begin())->getSourceLocation(), 11613 diag::warn_delegating_ctor_cycle) 11614 << Ctor; 11615 11616 // Don't add a note for a function delegating directly to itself. 11617 if (TCanonical != Canonical) 11618 S.Diag(Target->getLocation(), diag::note_it_delegates_to); 11619 11620 CXXConstructorDecl *C = Target; 11621 while (C->getCanonicalDecl() != Canonical) { 11622 const FunctionDecl *FNTarget = 0; 11623 (void)C->getTargetConstructor()->hasBody(FNTarget); 11624 assert(FNTarget && "Ctor cycle through bodiless function"); 11625 11626 C = const_cast<CXXConstructorDecl*>( 11627 cast<CXXConstructorDecl>(FNTarget)); 11628 S.Diag(C->getLocation(), diag::note_which_delegates_to); 11629 } 11630 } 11631 11632 for (CI = Current.begin(), CE = Current.end(); CI != CE; ++CI) 11633 Invalid.insert(*CI); 11634 Current.clear(); 11635 } else { 11636 DelegatingCycleHelper(Target, Valid, Invalid, Current, S); 11637 } 11638} 11639 11640 11641void Sema::CheckDelegatingCtorCycles() { 11642 llvm::SmallSet<CXXConstructorDecl*, 4> Valid, Invalid, Current; 11643 11644 llvm::SmallSet<CXXConstructorDecl*, 4>::iterator CI = Current.begin(), 11645 CE = Current.end(); 11646 11647 for (DelegatingCtorDeclsType::iterator 11648 I = DelegatingCtorDecls.begin(ExternalSource), 11649 E = DelegatingCtorDecls.end(); 11650 I != E; ++I) 11651 DelegatingCycleHelper(*I, Valid, Invalid, Current, *this); 11652 11653 for (CI = Invalid.begin(), CE = Invalid.end(); CI != CE; ++CI) 11654 (*CI)->setInvalidDecl(); 11655} 11656 11657namespace { 11658 /// \brief AST visitor that finds references to the 'this' expression. 11659 class FindCXXThisExpr : public RecursiveASTVisitor<FindCXXThisExpr> { 11660 Sema &S; 11661 11662 public: 11663 explicit FindCXXThisExpr(Sema &S) : S(S) { } 11664 11665 bool VisitCXXThisExpr(CXXThisExpr *E) { 11666 S.Diag(E->getLocation(), diag::err_this_static_member_func) 11667 << E->isImplicit(); 11668 return false; 11669 } 11670 }; 11671} 11672 11673bool Sema::checkThisInStaticMemberFunctionType(CXXMethodDecl *Method) { 11674 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11675 if (!TSInfo) 11676 return false; 11677 11678 TypeLoc TL = TSInfo->getTypeLoc(); 11679 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11680 if (!ProtoTL) 11681 return false; 11682 11683 // C++11 [expr.prim.general]p3: 11684 // [The expression this] shall not appear before the optional 11685 // cv-qualifier-seq and it shall not appear within the declaration of a 11686 // static member function (although its type and value category are defined 11687 // within a static member function as they are within a non-static member 11688 // function). [ Note: this is because declaration matching does not occur 11689 // until the complete declarator is known. - end note ] 11690 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11691 FindCXXThisExpr Finder(*this); 11692 11693 // If the return type came after the cv-qualifier-seq, check it now. 11694 if (Proto->hasTrailingReturn() && 11695 !Finder.TraverseTypeLoc(ProtoTL.getResultLoc())) 11696 return true; 11697 11698 // Check the exception specification. 11699 if (checkThisInStaticMemberFunctionExceptionSpec(Method)) 11700 return true; 11701 11702 return checkThisInStaticMemberFunctionAttributes(Method); 11703} 11704 11705bool Sema::checkThisInStaticMemberFunctionExceptionSpec(CXXMethodDecl *Method) { 11706 TypeSourceInfo *TSInfo = Method->getTypeSourceInfo(); 11707 if (!TSInfo) 11708 return false; 11709 11710 TypeLoc TL = TSInfo->getTypeLoc(); 11711 FunctionProtoTypeLoc ProtoTL = TL.getAs<FunctionProtoTypeLoc>(); 11712 if (!ProtoTL) 11713 return false; 11714 11715 const FunctionProtoType *Proto = ProtoTL.getTypePtr(); 11716 FindCXXThisExpr Finder(*this); 11717 11718 switch (Proto->getExceptionSpecType()) { 11719 case EST_Uninstantiated: 11720 case EST_Unevaluated: 11721 case EST_BasicNoexcept: 11722 case EST_DynamicNone: 11723 case EST_MSAny: 11724 case EST_None: 11725 break; 11726 11727 case EST_ComputedNoexcept: 11728 if (!Finder.TraverseStmt(Proto->getNoexceptExpr())) 11729 return true; 11730 11731 case EST_Dynamic: 11732 for (FunctionProtoType::exception_iterator E = Proto->exception_begin(), 11733 EEnd = Proto->exception_end(); 11734 E != EEnd; ++E) { 11735 if (!Finder.TraverseType(*E)) 11736 return true; 11737 } 11738 break; 11739 } 11740 11741 return false; 11742} 11743 11744bool Sema::checkThisInStaticMemberFunctionAttributes(CXXMethodDecl *Method) { 11745 FindCXXThisExpr Finder(*this); 11746 11747 // Check attributes. 11748 for (Decl::attr_iterator A = Method->attr_begin(), AEnd = Method->attr_end(); 11749 A != AEnd; ++A) { 11750 // FIXME: This should be emitted by tblgen. 11751 Expr *Arg = 0; 11752 ArrayRef<Expr *> Args; 11753 if (GuardedByAttr *G = dyn_cast<GuardedByAttr>(*A)) 11754 Arg = G->getArg(); 11755 else if (PtGuardedByAttr *G = dyn_cast<PtGuardedByAttr>(*A)) 11756 Arg = G->getArg(); 11757 else if (AcquiredAfterAttr *AA = dyn_cast<AcquiredAfterAttr>(*A)) 11758 Args = ArrayRef<Expr *>(AA->args_begin(), AA->args_size()); 11759 else if (AcquiredBeforeAttr *AB = dyn_cast<AcquiredBeforeAttr>(*A)) 11760 Args = ArrayRef<Expr *>(AB->args_begin(), AB->args_size()); 11761 else if (ExclusiveLockFunctionAttr *ELF 11762 = dyn_cast<ExclusiveLockFunctionAttr>(*A)) 11763 Args = ArrayRef<Expr *>(ELF->args_begin(), ELF->args_size()); 11764 else if (SharedLockFunctionAttr *SLF 11765 = dyn_cast<SharedLockFunctionAttr>(*A)) 11766 Args = ArrayRef<Expr *>(SLF->args_begin(), SLF->args_size()); 11767 else if (ExclusiveTrylockFunctionAttr *ETLF 11768 = dyn_cast<ExclusiveTrylockFunctionAttr>(*A)) { 11769 Arg = ETLF->getSuccessValue(); 11770 Args = ArrayRef<Expr *>(ETLF->args_begin(), ETLF->args_size()); 11771 } else if (SharedTrylockFunctionAttr *STLF 11772 = dyn_cast<SharedTrylockFunctionAttr>(*A)) { 11773 Arg = STLF->getSuccessValue(); 11774 Args = ArrayRef<Expr *>(STLF->args_begin(), STLF->args_size()); 11775 } else if (UnlockFunctionAttr *UF = dyn_cast<UnlockFunctionAttr>(*A)) 11776 Args = ArrayRef<Expr *>(UF->args_begin(), UF->args_size()); 11777 else if (LockReturnedAttr *LR = dyn_cast<LockReturnedAttr>(*A)) 11778 Arg = LR->getArg(); 11779 else if (LocksExcludedAttr *LE = dyn_cast<LocksExcludedAttr>(*A)) 11780 Args = ArrayRef<Expr *>(LE->args_begin(), LE->args_size()); 11781 else if (ExclusiveLocksRequiredAttr *ELR 11782 = dyn_cast<ExclusiveLocksRequiredAttr>(*A)) 11783 Args = ArrayRef<Expr *>(ELR->args_begin(), ELR->args_size()); 11784 else if (SharedLocksRequiredAttr *SLR 11785 = dyn_cast<SharedLocksRequiredAttr>(*A)) 11786 Args = ArrayRef<Expr *>(SLR->args_begin(), SLR->args_size()); 11787 11788 if (Arg && !Finder.TraverseStmt(Arg)) 11789 return true; 11790 11791 for (unsigned I = 0, N = Args.size(); I != N; ++I) { 11792 if (!Finder.TraverseStmt(Args[I])) 11793 return true; 11794 } 11795 } 11796 11797 return false; 11798} 11799 11800void 11801Sema::checkExceptionSpecification(ExceptionSpecificationType EST, 11802 ArrayRef<ParsedType> DynamicExceptions, 11803 ArrayRef<SourceRange> DynamicExceptionRanges, 11804 Expr *NoexceptExpr, 11805 SmallVectorImpl<QualType> &Exceptions, 11806 FunctionProtoType::ExtProtoInfo &EPI) { 11807 Exceptions.clear(); 11808 EPI.ExceptionSpecType = EST; 11809 if (EST == EST_Dynamic) { 11810 Exceptions.reserve(DynamicExceptions.size()); 11811 for (unsigned ei = 0, ee = DynamicExceptions.size(); ei != ee; ++ei) { 11812 // FIXME: Preserve type source info. 11813 QualType ET = GetTypeFromParser(DynamicExceptions[ei]); 11814 11815 SmallVector<UnexpandedParameterPack, 2> Unexpanded; 11816 collectUnexpandedParameterPacks(ET, Unexpanded); 11817 if (!Unexpanded.empty()) { 11818 DiagnoseUnexpandedParameterPacks(DynamicExceptionRanges[ei].getBegin(), 11819 UPPC_ExceptionType, 11820 Unexpanded); 11821 continue; 11822 } 11823 11824 // Check that the type is valid for an exception spec, and 11825 // drop it if not. 11826 if (!CheckSpecifiedExceptionType(ET, DynamicExceptionRanges[ei])) 11827 Exceptions.push_back(ET); 11828 } 11829 EPI.NumExceptions = Exceptions.size(); 11830 EPI.Exceptions = Exceptions.data(); 11831 return; 11832 } 11833 11834 if (EST == EST_ComputedNoexcept) { 11835 // If an error occurred, there's no expression here. 11836 if (NoexceptExpr) { 11837 assert((NoexceptExpr->isTypeDependent() || 11838 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 11839 Context.BoolTy) && 11840 "Parser should have made sure that the expression is boolean"); 11841 if (NoexceptExpr && DiagnoseUnexpandedParameterPack(NoexceptExpr)) { 11842 EPI.ExceptionSpecType = EST_BasicNoexcept; 11843 return; 11844 } 11845 11846 if (!NoexceptExpr->isValueDependent()) 11847 NoexceptExpr = VerifyIntegerConstantExpression(NoexceptExpr, 0, 11848 diag::err_noexcept_needs_constant_expression, 11849 /*AllowFold*/ false).take(); 11850 EPI.NoexceptExpr = NoexceptExpr; 11851 } 11852 return; 11853 } 11854} 11855 11856/// IdentifyCUDATarget - Determine the CUDA compilation target for this function 11857Sema::CUDAFunctionTarget Sema::IdentifyCUDATarget(const FunctionDecl *D) { 11858 // Implicitly declared functions (e.g. copy constructors) are 11859 // __host__ __device__ 11860 if (D->isImplicit()) 11861 return CFT_HostDevice; 11862 11863 if (D->hasAttr<CUDAGlobalAttr>()) 11864 return CFT_Global; 11865 11866 if (D->hasAttr<CUDADeviceAttr>()) { 11867 if (D->hasAttr<CUDAHostAttr>()) 11868 return CFT_HostDevice; 11869 else 11870 return CFT_Device; 11871 } 11872 11873 return CFT_Host; 11874} 11875 11876bool Sema::CheckCUDATarget(CUDAFunctionTarget CallerTarget, 11877 CUDAFunctionTarget CalleeTarget) { 11878 // CUDA B.1.1 "The __device__ qualifier declares a function that is... 11879 // Callable from the device only." 11880 if (CallerTarget == CFT_Host && CalleeTarget == CFT_Device) 11881 return true; 11882 11883 // CUDA B.1.2 "The __global__ qualifier declares a function that is... 11884 // Callable from the host only." 11885 // CUDA B.1.3 "The __host__ qualifier declares a function that is... 11886 // Callable from the host only." 11887 if ((CallerTarget == CFT_Device || CallerTarget == CFT_Global) && 11888 (CalleeTarget == CFT_Host || CalleeTarget == CFT_Global)) 11889 return true; 11890 11891 if (CallerTarget == CFT_HostDevice && CalleeTarget != CFT_HostDevice) 11892 return true; 11893 11894 return false; 11895} 11896