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/StaticAnalyzer/Core/Checker.h" 20#include "clang/StaticAnalyzer/Core/CheckerManager.h" 21#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h" 22#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h" 23#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h" 24#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 25#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/Decl.h" 28 29using namespace clang; 30using namespace ento; 31 32namespace { 33class NSAutoreleasePoolChecker 34 : public Checker<check::PreObjCMessage> { 35 mutable OwningPtr<BugType> BT; 36 mutable Selector releaseS; 37 38public: 39 void checkPreObjCMessage(const ObjCMethodCall &msg, CheckerContext &C) const; 40}; 41 42} // end anonymous namespace 43 44void 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("Use -drain instead of -release", 63 "API Upgrade (Apple)")); 64 65 ExplodedNode *N = C.addTransition(); 66 if (!N) { 67 assert(0); 68 return; 69 } 70 71 BugReport *Report = new BugReport(*BT, "Use -drain instead of -release when " 72 "using NSAutoreleasePool and garbage collection", N); 73 Report->addRange(msg.getSourceRange()); 74 C.EmitReport(Report); 75} 76 77void ento::registerNSAutoreleasePoolChecker(CheckerManager &mgr) { 78 if (mgr.getLangOpts().getGC() != LangOptions::NonGC) 79 mgr.registerChecker<NSAutoreleasePoolChecker>(); 80} 81