#// Usage: jjs -cp <asmtools.jar> jd.js -- <classname> [jdis|jdec]

/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 *   - Redistributions of source code must retain the above copyright

 *     notice, this list of conditions and the following disclaimer.

 *

 *   - Redistributions in binary form must reproduce the above copyright

 *     notice, this list of conditions and the following disclaimer in the

 *     documentation and/or other materials provided with the distribution.

 *

 *   - Neither the name of Oracle nor the names of its

 *     contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS

 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

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 */

// javap-like disassembler/decoder tool that disassembles/decodes 

// java classes but with OpenJDK AsmTools disassembler/decoder syntax.

// You need to build asmtool.jar from OpenJDK codetools project

// specify it with -cp option.

// See also https://wiki.openjdk.java.net/display/CodeTools/AsmTools

function usage() {

    print("Usage: jjs -cp <asmtools.jar> jd.js -- <classname> [jdis|jdec]");

    exit(1);

}

if (arguments.length == 0) {

    usage();

}

// argument handling

// convert to internal class name

var className = arguments[0].replaceAll('\\.', '/');

var tool;

if (arguments.length > 1) {

    tool = arguments[1];

    switch (tool) {

        case 'jdis':

        case 'jdec':

            break;

        default:

            usage();

    }

} else {

    tool = "jdis"; // default tool

}

// Java classes used

var AsmTools = Java.type("org.openjdk.asmtools.Main");

var Files = Java.type("java.nio.file.Files");

var StandardCopyOption = Java.type("java.nio.file.StandardCopyOption");

// retrive input stream for .class bytes

var cl = AsmTools.class.classLoader;

var res = cl.getResource(className + ".class");

if (res) {

    var is = res.openStream();

    var tmpPath;

    try {

        // copy the content of the .class to a temp file

        tmpPath = Files.createTempFile("asmtools-", ".class");

        // mark as delete-on-exit

        tmpPath.toFile().deleteOnExit();

        Files.copy(is, tmpPath, [ StandardCopyOption.REPLACE_EXISTING ]);

    } finally {

        is.close();

    } 

    // invoke asmtools Main

    AsmTools.main([ tool, tmpPath.toString() ]);

} else {

    print("no such class: " + arguments[0]);

    exit(1);

}