/*

 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

import jdk.internal.org.objectweb.asm.*;

class Asmator {

    static byte[] fixup(byte[] buf) throws java.io.IOException {

        ClassReader cr = new ClassReader(buf);

        ClassWriter cw = new ClassWriter(0);

        ClassVisitor cv = new ClassVisitor(Opcodes.ASM4, cw) {

            public MethodVisitor visitMethod(

                final int access,

                final String name,

                final String desc,

                final String signature,

                final String[] exceptions)

            {

                MethodVisitor mv = super.visitMethod(access,

                        name,

                        desc,

                        signature,

                        exceptions);

                if (mv == null)  return null;

                if (name.equals("callme")) {

                    // make receiver go dead!

                    mv.visitInsn(Opcodes.ACONST_NULL);

                    mv.visitVarInsn(Opcodes.ASTORE, 0);

                }

                return mv;

            }

        };

        cr.accept(cv, 0);

        return cw.toByteArray();

    }

}