NSAutoreleasePoolChecker.cpp revision ec8605f1d7ec846dbf51047bfd5c56d32d1ff91c
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 it's 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/PathSensitive/CheckerContext.h" 22#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h" 23#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 24#include "clang/AST/DeclObjC.h" 25#include "clang/AST/Decl.h" 26 27using namespace clang; 28using namespace ento; 29 30namespace { 31class NSAutoreleasePoolChecker 32 : public Checker<check::PreObjCMessage> { 33 34 mutable Selector releaseS; 35 36public: 37 void checkPreObjCMessage(ObjCMessage msg, CheckerContext &C) const; 38}; 39 40} // end anonymous namespace 41 42void NSAutoreleasePoolChecker::checkPreObjCMessage(ObjCMessage msg, 43 CheckerContext &C) const { 44 45 const Expr *receiver = msg.getInstanceReceiver(); 46 if (!receiver) 47 return; 48 49 // FIXME: Enhance with value-tracking information instead of consulting 50 // the type of the expression. 51 const ObjCObjectPointerType* PT = 52 receiver->getType()->getAs<ObjCObjectPointerType>(); 53 54 if (!PT) 55 return; 56 const ObjCInterfaceDecl* OD = PT->getInterfaceDecl(); 57 if (!OD) 58 return; 59 if (!OD->getIdentifier()->getName().equals("NSAutoreleasePool")) 60 return; 61 62 if (releaseS.isNull()) 63 releaseS = GetNullarySelector("release", C.getASTContext()); 64 // Sending 'release' message? 65 if (msg.getSelector() != releaseS) 66 return; 67 68 SourceRange R = msg.getSourceRange(); 69 70 C.getBugReporter().EmitBasicReport("Use -drain instead of -release", 71 "API Upgrade (Apple)", 72 "Use -drain instead of -release when using NSAutoreleasePool " 73 "and garbage collection", R.getBegin(), &R, 1); 74} 75 76void ento::registerNSAutoreleasePoolChecker(CheckerManager &mgr) { 77 if (mgr.getLangOptions().getGCMode() != LangOptions::NonGC) 78 mgr.registerChecker<NSAutoreleasePoolChecker>(); 79} 80