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/PathSensitive/CheckerContext.h" 23#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 24#include "clang/StaticAnalyzer/Core/PathSensitive/ObjCMessage.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/Decl.h" 27 28using namespace clang; 29using namespace ento; 30 31namespace { 32class NSAutoreleasePoolChecker 33 : public Checker<check::PreObjCMessage> { 34 35 mutable Selector releaseS; 36 37public: 38 void checkPreObjCMessage(ObjCMessage msg, CheckerContext &C) const; 39}; 40 41} // end anonymous namespace 42 43void NSAutoreleasePoolChecker::checkPreObjCMessage(ObjCMessage msg, 44 CheckerContext &C) const { 45 46 const Expr *receiver = msg.getInstanceReceiver(); 47 if (!receiver) 48 return; 49 50 // FIXME: Enhance with value-tracking information instead of consulting 51 // the type of the expression. 52 const ObjCObjectPointerType* PT = 53 receiver->getType()->getAs<ObjCObjectPointerType>(); 54 55 if (!PT) 56 return; 57 const ObjCInterfaceDecl *OD = PT->getInterfaceDecl(); 58 if (!OD) 59 return; 60 if (!OD->getIdentifier()->getName().equals("NSAutoreleasePool")) 61 return; 62 63 if (releaseS.isNull()) 64 releaseS = GetNullarySelector("release", C.getASTContext()); 65 // Sending 'release' message? 66 if (msg.getSelector() != releaseS) 67 return; 68 69 SourceRange R = msg.getSourceRange(); 70 BugReporter &BR = C.getBugReporter(); 71 const LocationContext *LC = C.getPredecessor()->getLocationContext(); 72 const SourceManager &SM = BR.getSourceManager(); 73 const Expr *E = msg.getMsgOrPropExpr(); 74 PathDiagnosticLocation L = PathDiagnosticLocation::createBegin(E, SM, LC); 75 C.getBugReporter().EmitBasicReport("Use -drain instead of -release", 76 "API Upgrade (Apple)", 77 "Use -drain instead of -release when using NSAutoreleasePool " 78 "and garbage collection", L, &R, 1); 79} 80 81void ento::registerNSAutoreleasePoolChecker(CheckerManager &mgr) { 82 if (mgr.getLangOptions().getGC() != LangOptions::NonGC) 83 mgr.registerChecker<NSAutoreleasePoolChecker>(); 84} 85