1 //=- NSAutoreleasePoolChecker.cpp --------------------------------*- 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 a NSAutoreleasePoolChecker, a small checker that warns 11 // about subpar uses of NSAutoreleasePool. Note that while the check itself 12 // (in its current form) could be written as a flow-insensitive check, in 13 // can be potentially enhanced in the future with flow-sensitive information. 14 // It is also a good example of the CheckerVisitor interface. 15 // 16 //===----------------------------------------------------------------------===// 17 18 #include "ClangSACheckers.h" 19 #include "clang/AST/Decl.h" 20 #include "clang/AST/DeclObjC.h" 21 #include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h" 22 #include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" 23 #include "clang/StaticAnalyzer/Core/Checker.h" 24 #include "clang/StaticAnalyzer/Core/CheckerManager.h" 25 #include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h" 26 #include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 27 #include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 28 29 using namespace clang; 30 using namespace ento; 31 32 namespace { 33 class NSAutoreleasePoolChecker 34 : public Checker<check::PreObjCMessage> { 35 mutable std::unique_ptr<BugType> BT; 36 mutable Selector releaseS; 37 38 public: 39 void checkPreObjCMessage(const ObjCMethodCall &msg, CheckerContext &C) const; 40 }; 41 42 } // end anonymous namespace 43 44 void NSAutoreleasePoolChecker::checkPreObjCMessage(const ObjCMethodCall &msg, 45 CheckerContext &C) const { 46 if (!msg.isInstanceMessage()) 47 return; 48 49 const ObjCInterfaceDecl *OD = msg.getReceiverInterface(); 50 if (!OD) 51 return; 52 if (!OD->getIdentifier()->isStr("NSAutoreleasePool")) 53 return; 54 55 if (releaseS.isNull()) 56 releaseS = GetNullarySelector("release", C.getASTContext()); 57 // Sending 'release' message? 58 if (msg.getSelector() != releaseS) 59 return; 60 61 if (!BT) 62 BT.reset(new BugType(this, "Use -drain instead of -release", 63 "API Upgrade (Apple)")); 64 65 ExplodedNode *N = C.generateNonFatalErrorNode(); 66 if (!N) { 67 assert(0); 68 return; 69 } 70 71 auto Report = llvm::make_unique<BugReport>( 72 *BT, "Use -drain instead of -release when using NSAutoreleasePool and " 73 "garbage collection", N); 74 Report->addRange(msg.getSourceRange()); 75 C.emitReport(std::move(Report)); 76 } 77 78 void ento::registerNSAutoreleasePoolChecker(CheckerManager &mgr) { 79 if (mgr.getLangOpts().getGC() != LangOptions::NonGC) 80 mgr.registerChecker<NSAutoreleasePoolChecker>(); 81 } 82
