/* 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;
/** ArrayNullCheckTag combines ArrayCheckTag and NullCheckTag
* into one tag. It uses bits of one byte value to represent
* the check information. The right-most two bits stand for
* the array bounds checks, and the right third bit represents
* the null check.<p>
*
* For array references, the right three bits are meaningful;
* for other object refrences, only null check bit should be used.
*
* @see ArrayCheckTag
* @see NullCheckTag
*/
public class ArrayNullCheckTag implements OneByteCodeTag
{
private final static String NAME = "ArrayNullCheckTag";
private byte value = 0;
public ArrayNullCheckTag()
{}
public ArrayNullCheckTag(byte v)
{
value = v;
}
public String getName()
{
return NAME;
}
public byte[] getValue()
{
byte[] bv = new byte[1];
bv[0] = value;
return bv;
}
public String toString()
{
return Byte.toString(value);
}
/** Accumulates another byte value by OR. */
public byte accumulate(byte other)
{
byte oldv = value;
value |= other;
return oldv;
}
}