path: root/lib/StaticAnalyzer/Checkers/CStringChecker.cpp

//= CStringChecker.h - Checks calls to C string functions ----------*- C++ -*-//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This defines CStringChecker, which is an assortment of checks on calls
// to functions in <string.h>.
//
//===----------------------------------------------------------------------===//

#include "ClangSACheckers.h"
#include "clang/StaticAnalyzer/Core/Checker.h"
#include "clang/StaticAnalyzer/Core/CheckerManager.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/BugReporter/BugType.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/GRStateTrait.h"
#include "llvm/ADT/StringSwitch.h"

using namespace clang;
using namespace ento;

namespace {
class CStringChecker : public Checker< eval::Call,
                                         check::PreStmt<DeclStmt>,
                                         check::LiveSymbols,
                                         check::DeadSymbols,
                                         check::RegionChanges
                                         > {
  mutable llvm::OwningPtr<BugType> BT_Null, BT_Bounds, BT_BoundsWrite,
                                   BT_Overlap, BT_NotCString;
public:
  static void *getTag() { static int tag; return &tag; }

  bool evalCall(const CallExpr *CE, CheckerContext &C) const;
  void checkPreStmt(const DeclStmt *DS, CheckerContext &C) const;
  void checkLiveSymbols(const GRState *state, SymbolReaper &SR) const;
  void checkDeadSymbols(SymbolReaper &SR, CheckerContext &C) const;
  bool wantsRegionChangeUpdate(const GRState *state) const;

  const GRState *checkRegionChanges(const GRState *state,
                                    const StoreManager::InvalidatedSymbols *,
                                    const