NSAutoreleasePoolChecker.cpp revision 226633
1218887Sdim//=- NSAutoreleasePoolChecker.cpp --------------------------------*- C++ -*-==// 2218887Sdim// 3218887Sdim// The LLVM Compiler Infrastructure 4218887Sdim// 5218887Sdim// This file is distributed under the University of Illinois Open Source 6218887Sdim// License. See LICENSE.TXT for details. 7218887Sdim// 8218887Sdim//===----------------------------------------------------------------------===// 9218887Sdim// 10218887Sdim// This file defines a NSAutoreleasePoolChecker, a small checker that warns 11218887Sdim// about subpar uses of NSAutoreleasePool. Note that while the check itself 12226633Sdim// (in its current form) could be written as a flow-insensitive check, in 13218887Sdim// can be potentially enhanced in the future with flow-sensitive information. 14218887Sdim// It is also a good example of the CheckerVisitor interface. 15218887Sdim// 16218887Sdim//===----------------------------------------------------------------------===// 17218887Sdim 18218887Sdim#include "ClangSACheckers.h" 19221345Sdim#include "clang/StaticAnalyzer/Core/Checker.h" 20218887Sdim#include "clang/StaticAnalyzer/Core/CheckerManager.h" 21226633Sdim#include "clang/StaticAnalyzer/Core/BugReporter/BugReporter.h" 22219077Sdim#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h" 23218887Sdim#include "clang/StaticAnalyzer/Core/PathSensitive/ExprEngine.h" 24226633Sdim#include "clang/StaticAnalyzer/Core/PathSensitive/ObjCMessage.h" 25218887Sdim#include "clang/AST/DeclObjC.h" 26218887Sdim#include "clang/AST/Decl.h" 27218887Sdim 28218887Sdimusing namespace clang; 29218887Sdimusing namespace ento; 30218887Sdim 31218887Sdimnamespace { 32218887Sdimclass NSAutoreleasePoolChecker 33221345Sdim : public Checker<check::PreObjCMessage> { 34218887Sdim 35219077Sdim mutable Selector releaseS; 36218887Sdim 37218887Sdimpublic: 38219077Sdim void checkPreObjCMessage(ObjCMessage msg, CheckerContext &C) const; 39218887Sdim}; 40218887Sdim 41218887Sdim} // end anonymous namespace 42218887Sdim 43219077Sdimvoid NSAutoreleasePoolChecker::checkPreObjCMessage(ObjCMessage msg, 44219077Sdim CheckerContext &C) const { 45218887Sdim 46218887Sdim const Expr *receiver = msg.getInstanceReceiver(); 47218887Sdim if (!receiver) 48218887Sdim return; 49218887Sdim 50218887Sdim // FIXME: Enhance with value-tracking information instead of consulting 51218887Sdim // the type of the expression. 52218887Sdim const ObjCObjectPointerType* PT = 53218887Sdim receiver->getType()->getAs<ObjCObjectPointerType>(); 54218887Sdim 55218887Sdim if (!PT) 56218887Sdim return; 57226633Sdim const ObjCInterfaceDecl *OD = PT->getInterfaceDecl(); 58218887Sdim if (!OD) 59218887Sdim return; 60218887Sdim if (!OD->getIdentifier()->getName().equals("NSAutoreleasePool")) 61218887Sdim return; 62219077Sdim 63219077Sdim if (releaseS.isNull()) 64219077Sdim releaseS = GetNullarySelector("release", C.getASTContext()); 65218887Sdim // Sending 'release' message? 66218887Sdim if (msg.getSelector() != releaseS) 67218887Sdim return; 68218887Sdim 69218887Sdim SourceRange R = msg.getSourceRange(); 70226633Sdim BugReporter &BR = C.getBugReporter(); 71226633Sdim const LocationContext *LC = C.getPredecessor()->getLocationContext(); 72226633Sdim const SourceManager &SM = BR.getSourceManager(); 73226633Sdim const Expr *E = msg.getMsgOrPropExpr(); 74226633Sdim PathDiagnosticLocation L = PathDiagnosticLocation::createBegin(E, SM, LC); 75218887Sdim C.getBugReporter().EmitBasicReport("Use -drain instead of -release", 76218887Sdim "API Upgrade (Apple)", 77218887Sdim "Use -drain instead of -release when using NSAutoreleasePool " 78226633Sdim "and garbage collection", L, &R, 1); 79218887Sdim} 80219077Sdim 81219077Sdimvoid ento::registerNSAutoreleasePoolChecker(CheckerManager &mgr) { 82226633Sdim if (mgr.getLangOptions().getGC() != LangOptions::NonGC) 83219077Sdim mgr.registerChecker<NSAutoreleasePoolChecker>(); 84219077Sdim} 85