/* Soot - a J*va Optimization Framework
* Copyright (C) 2000 Feng Qian
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the Sable Research Group and others 1997-1999.
* See the 'credits' file distributed with Soot for the complete list of
* contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
*/
package soot.jimple.toolkits.annotation.tags;
/** Implementation of the Tag interface for array bounds checks.
*/
public class ArrayCheckTag implements OneByteCodeTag
{
private final static String NAME = "ArrayCheckTag";
private boolean lowerCheck = true;
private boolean upperCheck = true;
/**
* A tag represents two bounds checks of an array reference.
* The value 'true' indicates check needed.
*/
public ArrayCheckTag(boolean lower, boolean upper)
{
lowerCheck = lower;
upperCheck = upper;
}
/**
* Returns back the check information in binary form, which
* will be written into the class file.
*/
public byte[] getValue()
{
byte[] value = new byte[1];
value[0] = 0;
if (lowerCheck)
value[0] |= 0x01;
if (upperCheck)
value[0] |= 0x02;
return value;
}
/** Needs upper bound check?
*/
public boolean isCheckUpper()
{
return upperCheck;
}
/** Needs lower bound check?
*/
public boolean isCheckLower()
{
return lowerCheck;
}
public String getName()
{
return NAME;
}
public String toString()
{
return (lowerCheck ? "[potentially unsafe lower bound]": "[safe lower bound]") +"" + (upperCheck ? "[potentially unsafe upper bound]":"[safe upper bound]");
}
}