javassist.convert.TransformAfter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of javassist Show documentation

Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java.

There is a newer version: 3.30.2-GA

Show newest version

/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist.convert;

import javassist.CtMethod;
import javassist.NotFoundException;
import javassist.bytecode.BadBytecode;
import javassist.bytecode.CodeIterator;

public class TransformAfter extends TransformBefore {
    public TransformAfter(Transformer next,
                           CtMethod origMethod, CtMethod afterMethod)
        throws NotFoundException
    {
        super(next, origMethod, afterMethod);
    }

    @Override
    protected int match2(int pos, CodeIterator iterator) throws BadBytecode {
        iterator.move(pos);
        iterator.insert(saveCode);
        iterator.insert(loadCode);
        int p = iterator.insertGap(3);
        iterator.setMark(p);
        iterator.insert(loadCode);
        pos = iterator.next();
        p = iterator.getMark();
        iterator.writeByte(iterator.byteAt(pos), p);
        iterator.write16bit(iterator.u16bitAt(pos + 1), p + 1);
        iterator.writeByte(INVOKESTATIC, pos);
        iterator.write16bit(newIndex, pos + 1);
        iterator.move(p);
        return iterator.next();
    }
}