soot.jimple.toolkits.annotation.tags.ArrayNullCheckTag Maven / Gradle / Ivy
package soot.jimple.toolkits.annotation.tags;
/*-
* #%L
* Soot - a J*va Optimization Framework
* %%
* Copyright (C) 2000 Feng Qian
* %%
* This program 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 program 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 General Lesser Public License for more details.
*
* You should have received a copy of the GNU General Lesser Public
* License along with this program. If not, see
* .
* #L%
*/
/**
* 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.
*
*
* 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;
}
}