soot.jimple.toolkits.annotation.tags.NullCheckTag 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%
*/
/**
* NullCheckTag contains the null pointer check information. The right third bit of a byte is used to represent whether the
* null check is needed.
*/
public class NullCheckTag implements OneByteCodeTag {
private final static String NAME = "NullCheckTag";
private byte value = 0;
public NullCheckTag(boolean needCheck) {
if (needCheck) {
value = 0x04;
}
}
public String getName() {
return NAME;
}
public byte[] getValue() {
byte[] bv = new byte[1];
bv[0] = value;
return bv;
}
public boolean needCheck() {
if (value == 0) {
return false;
} else {
return true;
}
}
public String toString() {
return ((value == 0) ? "[not null]" : "[unknown]");
}
}