1 //== Checker.h - Registration mechanism for checkers -------------*- C++ -*--=// 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 defines Checker, used to create and register checkers. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef LLVM_CLANG_SA_CORE_CHECKER 15 #define LLVM_CLANG_SA_CORE_CHECKER 16 17 #include "clang/Analysis/ProgramPoint.h" 18 #include "clang/StaticAnalyzer/Core/CheckerManager.h" 19 #include "clang/StaticAnalyzer/Core/PathSensitive/SVals.h" 20 #include "llvm/Support/Casting.h" 21 22 namespace clang { 23 namespace ento { 24 class BugReporter; 25 26 namespace check { 27 28 struct _VoidCheck { _register_VoidCheck29 static void _register(void *checker, CheckerManager &mgr) { } 30 }; 31 32 template <typename DECL> 33 class ASTDecl { 34 template <typename CHECKER> _checkDecl(void * checker,const Decl * D,AnalysisManager & mgr,BugReporter & BR)35 static void _checkDecl(void *checker, const Decl *D, AnalysisManager& mgr, 36 BugReporter &BR) { 37 ((const CHECKER *)checker)->checkASTDecl(cast<DECL>(D), mgr, BR); 38 } 39 _handlesDecl(const Decl * D)40 static bool _handlesDecl(const Decl *D) { 41 return isa<DECL>(D); 42 } 43 public: 44 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)45 static void _register(CHECKER *checker, CheckerManager &mgr) { 46 mgr._registerForDecl(CheckerManager::CheckDeclFunc(checker, 47 _checkDecl<CHECKER>), 48 _handlesDecl); 49 } 50 }; 51 52 class ASTCodeBody { 53 template <typename CHECKER> _checkBody(void * checker,const Decl * D,AnalysisManager & mgr,BugReporter & BR)54 static void _checkBody(void *checker, const Decl *D, AnalysisManager& mgr, 55 BugReporter &BR) { 56 ((const CHECKER *)checker)->checkASTCodeBody(D, mgr, BR); 57 } 58 59 public: 60 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)61 static void _register(CHECKER *checker, CheckerManager &mgr) { 62 mgr._registerForBody(CheckerManager::CheckDeclFunc(checker, 63 _checkBody<CHECKER>)); 64 } 65 }; 66 67 class EndOfTranslationUnit { 68 template <typename CHECKER> _checkEndOfTranslationUnit(void * checker,const TranslationUnitDecl * TU,AnalysisManager & mgr,BugReporter & BR)69 static void _checkEndOfTranslationUnit(void *checker, 70 const TranslationUnitDecl *TU, 71 AnalysisManager& mgr, 72 BugReporter &BR) { 73 ((const CHECKER *)checker)->checkEndOfTranslationUnit(TU, mgr, BR); 74 } 75 76 public: 77 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)78 static void _register(CHECKER *checker, CheckerManager &mgr){ 79 mgr._registerForEndOfTranslationUnit( 80 CheckerManager::CheckEndOfTranslationUnit(checker, 81 _checkEndOfTranslationUnit<CHECKER>)); 82 } 83 }; 84 85 template <typename STMT> 86 class PreStmt { 87 template <typename CHECKER> _checkStmt(void * checker,const Stmt * S,CheckerContext & C)88 static void _checkStmt(void *checker, const Stmt *S, CheckerContext &C) { 89 ((const CHECKER *)checker)->checkPreStmt(cast<STMT>(S), C); 90 } 91 _handlesStmt(const Stmt * S)92 static bool _handlesStmt(const Stmt *S) { 93 return isa<STMT>(S); 94 } 95 public: 96 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)97 static void _register(CHECKER *checker, CheckerManager &mgr) { 98 mgr._registerForPreStmt(CheckerManager::CheckStmtFunc(checker, 99 _checkStmt<CHECKER>), 100 _handlesStmt); 101 } 102 }; 103 104 template <typename STMT> 105 class PostStmt { 106 template <typename CHECKER> _checkStmt(void * checker,const Stmt * S,CheckerContext & C)107 static void _checkStmt(void *checker, const Stmt *S, CheckerContext &C) { 108 ((const CHECKER *)checker)->checkPostStmt(cast<STMT>(S), C); 109 } 110 _handlesStmt(const Stmt * S)111 static bool _handlesStmt(const Stmt *S) { 112 return isa<STMT>(S); 113 } 114 public: 115 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)116 static void _register(CHECKER *checker, CheckerManager &mgr) { 117 mgr._registerForPostStmt(CheckerManager::CheckStmtFunc(checker, 118 _checkStmt<CHECKER>), 119 _handlesStmt); 120 } 121 }; 122 123 class PreObjCMessage { 124 template <typename CHECKER> _checkObjCMessage(void * checker,const ObjCMethodCall & msg,CheckerContext & C)125 static void _checkObjCMessage(void *checker, const ObjCMethodCall &msg, 126 CheckerContext &C) { 127 ((const CHECKER *)checker)->checkPreObjCMessage(msg, C); 128 } 129 130 public: 131 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)132 static void _register(CHECKER *checker, CheckerManager &mgr) { 133 mgr._registerForPreObjCMessage( 134 CheckerManager::CheckObjCMessageFunc(checker, _checkObjCMessage<CHECKER>)); 135 } 136 }; 137 138 class PostObjCMessage { 139 template <typename CHECKER> _checkObjCMessage(void * checker,const ObjCMethodCall & msg,CheckerContext & C)140 static void _checkObjCMessage(void *checker, const ObjCMethodCall &msg, 141 CheckerContext &C) { 142 ((const CHECKER *)checker)->checkPostObjCMessage(msg, C); 143 } 144 145 public: 146 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)147 static void _register(CHECKER *checker, CheckerManager &mgr) { 148 mgr._registerForPostObjCMessage( 149 CheckerManager::CheckObjCMessageFunc(checker, _checkObjCMessage<CHECKER>)); 150 } 151 }; 152 153 class PreCall { 154 template <typename CHECKER> _checkCall(void * checker,const CallEvent & msg,CheckerContext & C)155 static void _checkCall(void *checker, const CallEvent &msg, 156 CheckerContext &C) { 157 ((const CHECKER *)checker)->checkPreCall(msg, C); 158 } 159 160 public: 161 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)162 static void _register(CHECKER *checker, CheckerManager &mgr) { 163 mgr._registerForPreCall( 164 CheckerManager::CheckCallFunc(checker, _checkCall<CHECKER>)); 165 } 166 }; 167 168 class PostCall { 169 template <typename CHECKER> _checkCall(void * checker,const CallEvent & msg,CheckerContext & C)170 static void _checkCall(void *checker, const CallEvent &msg, 171 CheckerContext &C) { 172 ((const CHECKER *)checker)->checkPostCall(msg, C); 173 } 174 175 public: 176 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)177 static void _register(CHECKER *checker, CheckerManager &mgr) { 178 mgr._registerForPostCall( 179 CheckerManager::CheckCallFunc(checker, _checkCall<CHECKER>)); 180 } 181 }; 182 183 class Location { 184 template <typename CHECKER> _checkLocation(void * checker,const SVal & location,bool isLoad,const Stmt * S,CheckerContext & C)185 static void _checkLocation(void *checker, 186 const SVal &location, bool isLoad, const Stmt *S, 187 CheckerContext &C) { 188 ((const CHECKER *)checker)->checkLocation(location, isLoad, S, C); 189 } 190 191 public: 192 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)193 static void _register(CHECKER *checker, CheckerManager &mgr) { 194 mgr._registerForLocation( 195 CheckerManager::CheckLocationFunc(checker, _checkLocation<CHECKER>)); 196 } 197 }; 198 199 class Bind { 200 template <typename CHECKER> _checkBind(void * checker,const SVal & location,const SVal & val,const Stmt * S,CheckerContext & C)201 static void _checkBind(void *checker, 202 const SVal &location, const SVal &val, const Stmt *S, 203 CheckerContext &C) { 204 ((const CHECKER *)checker)->checkBind(location, val, S, C); 205 } 206 207 public: 208 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)209 static void _register(CHECKER *checker, CheckerManager &mgr) { 210 mgr._registerForBind( 211 CheckerManager::CheckBindFunc(checker, _checkBind<CHECKER>)); 212 } 213 }; 214 215 class EndAnalysis { 216 template <typename CHECKER> _checkEndAnalysis(void * checker,ExplodedGraph & G,BugReporter & BR,ExprEngine & Eng)217 static void _checkEndAnalysis(void *checker, ExplodedGraph &G, 218 BugReporter &BR, ExprEngine &Eng) { 219 ((const CHECKER *)checker)->checkEndAnalysis(G, BR, Eng); 220 } 221 222 public: 223 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)224 static void _register(CHECKER *checker, CheckerManager &mgr) { 225 mgr._registerForEndAnalysis( 226 CheckerManager::CheckEndAnalysisFunc(checker, _checkEndAnalysis<CHECKER>)); 227 } 228 }; 229 230 class EndFunction { 231 template <typename CHECKER> _checkEndFunction(void * checker,CheckerContext & C)232 static void _checkEndFunction(void *checker, 233 CheckerContext &C) { 234 ((const CHECKER *)checker)->checkEndFunction(C); 235 } 236 237 public: 238 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)239 static void _register(CHECKER *checker, CheckerManager &mgr) { 240 mgr._registerForEndFunction( 241 CheckerManager::CheckEndFunctionFunc(checker, _checkEndFunction<CHECKER>)); 242 } 243 }; 244 245 class BranchCondition { 246 template <typename CHECKER> _checkBranchCondition(void * checker,const Stmt * Condition,CheckerContext & C)247 static void _checkBranchCondition(void *checker, const Stmt *Condition, 248 CheckerContext & C) { 249 ((const CHECKER *)checker)->checkBranchCondition(Condition, C); 250 } 251 252 public: 253 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)254 static void _register(CHECKER *checker, CheckerManager &mgr) { 255 mgr._registerForBranchCondition( 256 CheckerManager::CheckBranchConditionFunc(checker, 257 _checkBranchCondition<CHECKER>)); 258 } 259 }; 260 261 class LiveSymbols { 262 template <typename CHECKER> _checkLiveSymbols(void * checker,ProgramStateRef state,SymbolReaper & SR)263 static void _checkLiveSymbols(void *checker, ProgramStateRef state, 264 SymbolReaper &SR) { 265 ((const CHECKER *)checker)->checkLiveSymbols(state, SR); 266 } 267 268 public: 269 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)270 static void _register(CHECKER *checker, CheckerManager &mgr) { 271 mgr._registerForLiveSymbols( 272 CheckerManager::CheckLiveSymbolsFunc(checker, _checkLiveSymbols<CHECKER>)); 273 } 274 }; 275 276 class DeadSymbols { 277 template <typename CHECKER> _checkDeadSymbols(void * checker,SymbolReaper & SR,CheckerContext & C)278 static void _checkDeadSymbols(void *checker, 279 SymbolReaper &SR, CheckerContext &C) { 280 ((const CHECKER *)checker)->checkDeadSymbols(SR, C); 281 } 282 283 public: 284 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)285 static void _register(CHECKER *checker, CheckerManager &mgr) { 286 mgr._registerForDeadSymbols( 287 CheckerManager::CheckDeadSymbolsFunc(checker, _checkDeadSymbols<CHECKER>)); 288 } 289 }; 290 291 class RegionChanges { 292 template <typename CHECKER> 293 static ProgramStateRef _checkRegionChanges(void * checker,ProgramStateRef state,const InvalidatedSymbols * invalidated,ArrayRef<const MemRegion * > Explicits,ArrayRef<const MemRegion * > Regions,const CallEvent * Call)294 _checkRegionChanges(void *checker, 295 ProgramStateRef state, 296 const InvalidatedSymbols *invalidated, 297 ArrayRef<const MemRegion *> Explicits, 298 ArrayRef<const MemRegion *> Regions, 299 const CallEvent *Call) { 300 return ((const CHECKER *)checker)->checkRegionChanges(state, invalidated, 301 Explicits, Regions, Call); 302 } 303 template <typename CHECKER> _wantsRegionChangeUpdate(void * checker,ProgramStateRef state)304 static bool _wantsRegionChangeUpdate(void *checker, 305 ProgramStateRef state) { 306 return ((const CHECKER *)checker)->wantsRegionChangeUpdate(state); 307 } 308 309 public: 310 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)311 static void _register(CHECKER *checker, CheckerManager &mgr) { 312 mgr._registerForRegionChanges( 313 CheckerManager::CheckRegionChangesFunc(checker, 314 _checkRegionChanges<CHECKER>), 315 CheckerManager::WantsRegionChangeUpdateFunc(checker, 316 _wantsRegionChangeUpdate<CHECKER>)); 317 } 318 }; 319 320 class PointerEscape { 321 template <typename CHECKER> 322 static ProgramStateRef _checkPointerEscape(void * Checker,ProgramStateRef State,const InvalidatedSymbols & Escaped,const CallEvent * Call,PointerEscapeKind Kind,RegionAndSymbolInvalidationTraits * ETraits)323 _checkPointerEscape(void *Checker, 324 ProgramStateRef State, 325 const InvalidatedSymbols &Escaped, 326 const CallEvent *Call, 327 PointerEscapeKind Kind, 328 RegionAndSymbolInvalidationTraits *ETraits) { 329 330 if (!ETraits) 331 return ((const CHECKER *)Checker)->checkPointerEscape(State, 332 Escaped, 333 Call, 334 Kind); 335 336 InvalidatedSymbols RegularEscape; 337 for (InvalidatedSymbols::const_iterator I = Escaped.begin(), 338 E = Escaped.end(); I != E; ++I) 339 if (!ETraits->hasTrait(*I, 340 RegionAndSymbolInvalidationTraits::TK_PreserveContents) && 341 !ETraits->hasTrait(*I, 342 RegionAndSymbolInvalidationTraits::TK_SuppressEscape)) 343 RegularEscape.insert(*I); 344 345 if (RegularEscape.empty()) 346 return State; 347 348 return ((const CHECKER *)Checker)->checkPointerEscape(State, 349 RegularEscape, 350 Call, 351 Kind); 352 } 353 354 public: 355 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)356 static void _register(CHECKER *checker, CheckerManager &mgr) { 357 mgr._registerForPointerEscape( 358 CheckerManager::CheckPointerEscapeFunc(checker, 359 _checkPointerEscape<CHECKER>)); 360 } 361 }; 362 363 class ConstPointerEscape { 364 template <typename CHECKER> 365 static ProgramStateRef _checkConstPointerEscape(void * Checker,ProgramStateRef State,const InvalidatedSymbols & Escaped,const CallEvent * Call,PointerEscapeKind Kind,RegionAndSymbolInvalidationTraits * ETraits)366 _checkConstPointerEscape(void *Checker, 367 ProgramStateRef State, 368 const InvalidatedSymbols &Escaped, 369 const CallEvent *Call, 370 PointerEscapeKind Kind, 371 RegionAndSymbolInvalidationTraits *ETraits) { 372 373 if (!ETraits) 374 return State; 375 376 InvalidatedSymbols ConstEscape; 377 for (InvalidatedSymbols::const_iterator I = Escaped.begin(), 378 E = Escaped.end(); I != E; ++I) 379 if (ETraits->hasTrait(*I, 380 RegionAndSymbolInvalidationTraits::TK_PreserveContents) && 381 !ETraits->hasTrait(*I, 382 RegionAndSymbolInvalidationTraits::TK_SuppressEscape)) 383 ConstEscape.insert(*I); 384 385 if (ConstEscape.empty()) 386 return State; 387 388 return ((const CHECKER *)Checker)->checkConstPointerEscape(State, 389 ConstEscape, 390 Call, 391 Kind); 392 } 393 394 public: 395 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)396 static void _register(CHECKER *checker, CheckerManager &mgr) { 397 mgr._registerForPointerEscape( 398 CheckerManager::CheckPointerEscapeFunc(checker, 399 _checkConstPointerEscape<CHECKER>)); 400 } 401 }; 402 403 404 template <typename EVENT> 405 class Event { 406 template <typename CHECKER> _checkEvent(void * checker,const void * event)407 static void _checkEvent(void *checker, const void *event) { 408 ((const CHECKER *)checker)->checkEvent(*(const EVENT *)event); 409 } 410 public: 411 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)412 static void _register(CHECKER *checker, CheckerManager &mgr) { 413 mgr._registerListenerForEvent<EVENT>( 414 CheckerManager::CheckEventFunc(checker, _checkEvent<CHECKER>)); 415 } 416 }; 417 418 } // end check namespace 419 420 namespace eval { 421 422 class Assume { 423 template <typename CHECKER> _evalAssume(void * checker,ProgramStateRef state,const SVal & cond,bool assumption)424 static ProgramStateRef _evalAssume(void *checker, 425 ProgramStateRef state, 426 const SVal &cond, 427 bool assumption) { 428 return ((const CHECKER *)checker)->evalAssume(state, cond, assumption); 429 } 430 431 public: 432 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)433 static void _register(CHECKER *checker, CheckerManager &mgr) { 434 mgr._registerForEvalAssume( 435 CheckerManager::EvalAssumeFunc(checker, _evalAssume<CHECKER>)); 436 } 437 }; 438 439 class Call { 440 template <typename CHECKER> _evalCall(void * checker,const CallExpr * CE,CheckerContext & C)441 static bool _evalCall(void *checker, const CallExpr *CE, CheckerContext &C) { 442 return ((const CHECKER *)checker)->evalCall(CE, C); 443 } 444 445 public: 446 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)447 static void _register(CHECKER *checker, CheckerManager &mgr) { 448 mgr._registerForEvalCall( 449 CheckerManager::EvalCallFunc(checker, _evalCall<CHECKER>)); 450 } 451 }; 452 453 } // end eval namespace 454 455 class CheckerBase : public ProgramPointTag { 456 CheckName Name; 457 friend class ::clang::ento::CheckerManager; 458 459 public: 460 StringRef getTagDescription() const override; 461 CheckName getCheckName() const; 462 463 /// See CheckerManager::runCheckersForPrintState. printState(raw_ostream & Out,ProgramStateRef State,const char * NL,const char * Sep)464 virtual void printState(raw_ostream &Out, ProgramStateRef State, 465 const char *NL, const char *Sep) const { } 466 }; 467 468 /// Dump checker name to stream. 469 raw_ostream& operator<<(raw_ostream &Out, const CheckerBase &Checker); 470 471 /// Tag that can use a checker name as a message provider 472 /// (see SimpleProgramPointTag). 473 class CheckerProgramPointTag : public SimpleProgramPointTag { 474 public: 475 CheckerProgramPointTag(StringRef CheckerName, StringRef Msg); 476 CheckerProgramPointTag(const CheckerBase *Checker, StringRef Msg); 477 }; 478 479 template <typename CHECK1, typename CHECK2=check::_VoidCheck, 480 typename CHECK3=check::_VoidCheck, typename CHECK4=check::_VoidCheck, 481 typename CHECK5=check::_VoidCheck, typename CHECK6=check::_VoidCheck, 482 typename CHECK7=check::_VoidCheck, typename CHECK8=check::_VoidCheck, 483 typename CHECK9=check::_VoidCheck, typename CHECK10=check::_VoidCheck, 484 typename CHECK11=check::_VoidCheck,typename CHECK12=check::_VoidCheck, 485 typename CHECK13=check::_VoidCheck,typename CHECK14=check::_VoidCheck, 486 typename CHECK15=check::_VoidCheck,typename CHECK16=check::_VoidCheck, 487 typename CHECK17=check::_VoidCheck,typename CHECK18=check::_VoidCheck, 488 typename CHECK19=check::_VoidCheck,typename CHECK20=check::_VoidCheck, 489 typename CHECK21=check::_VoidCheck,typename CHECK22=check::_VoidCheck, 490 typename CHECK23=check::_VoidCheck,typename CHECK24=check::_VoidCheck> 491 class Checker; 492 493 template <> 494 class Checker<check::_VoidCheck> 495 : public CheckerBase 496 { 497 virtual void anchor(); 498 public: _register(void * checker,CheckerManager & mgr)499 static void _register(void *checker, CheckerManager &mgr) { } 500 }; 501 502 template <typename CHECK1, typename CHECK2, typename CHECK3, typename CHECK4, 503 typename CHECK5, typename CHECK6, typename CHECK7, typename CHECK8, 504 typename CHECK9, typename CHECK10,typename CHECK11,typename CHECK12, 505 typename CHECK13,typename CHECK14,typename CHECK15,typename CHECK16, 506 typename CHECK17,typename CHECK18,typename CHECK19,typename CHECK20, 507 typename CHECK21,typename CHECK22,typename CHECK23,typename CHECK24> 508 class Checker 509 : public CHECK1, 510 public Checker<CHECK2, CHECK3, CHECK4, CHECK5, CHECK6, CHECK7, 511 CHECK8, CHECK9, CHECK10,CHECK11,CHECK12,CHECK13, 512 CHECK14,CHECK15,CHECK16,CHECK17,CHECK18,CHECK19, 513 CHECK20,CHECK21,CHECK22,CHECK23,CHECK24> { 514 public: 515 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)516 static void _register(CHECKER *checker, CheckerManager &mgr) { 517 CHECK1::_register(checker, mgr); 518 Checker<CHECK2, CHECK3, CHECK4, CHECK5, CHECK6, CHECK7, 519 CHECK8, CHECK9, CHECK10,CHECK11,CHECK12,CHECK13, 520 CHECK14,CHECK15,CHECK16,CHECK17,CHECK18,CHECK19, 521 CHECK20,CHECK21,CHECK22,CHECK23,CHECK24>::_register(checker, mgr); 522 } 523 }; 524 525 template <typename EVENT> 526 class EventDispatcher { 527 CheckerManager *Mgr; 528 public: EventDispatcher()529 EventDispatcher() : Mgr(nullptr) { } 530 531 template <typename CHECKER> _register(CHECKER * checker,CheckerManager & mgr)532 static void _register(CHECKER *checker, CheckerManager &mgr) { 533 mgr._registerDispatcherForEvent<EVENT>(); 534 static_cast<EventDispatcher<EVENT> *>(checker)->Mgr = &mgr; 535 } 536 dispatchEvent(const EVENT & event)537 void dispatchEvent(const EVENT &event) const { 538 Mgr->_dispatchEvent(event); 539 } 540 }; 541 542 /// \brief We dereferenced a location that may be null. 543 struct ImplicitNullDerefEvent { 544 SVal Location; 545 bool IsLoad; 546 ExplodedNode *SinkNode; 547 BugReporter *BR; 548 }; 549 550 /// \brief A helper class which wraps a boolean value set to false by default. 551 /// 552 /// This class should behave exactly like 'bool' except that it doesn't need to 553 /// be explicitly initialized. 554 struct DefaultBool { 555 bool val; DefaultBoolDefaultBool556 DefaultBool() : val(false) {} 557 /*implicit*/ operator bool&() { return val; } 558 /*implicit*/ operator const bool&() const { return val; } 559 DefaultBool &operator=(bool b) { val = b; return *this; } 560 }; 561 562 } // end ento namespace 563 564 } // end clang namespace 565 566 #endif 567