soot.jimple.toolkits.annotation.tags.ArrayCheckTag 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%
*/
/**
* 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]");
}
}