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

     2 

     3 /*

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

     5  *

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

     7  * modification, are permitted provided that the following conditions

     8  * are met:

     9  *

    10  *   - Redistributions of source code must retain the above copyright

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

    12  *

    13  *   - Redistributions in binary form must reproduce the above copyright

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

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

    16  *

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

    18  *     contributors may be used to endorse or promote products derived

    19  *     from this software without specific prior written permission.

    20  *

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

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

    23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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

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

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

    27  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    28  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

    29  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

    30  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

    31  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    32  */

    33 

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

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

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

    37 // specify it with -cp option.

    38 

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

    40 

    41 function usage() {

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

    43     exit(1);

    44 }

    45 

    46 if (arguments.length == 0) {

    47     usage();

    48 }

    49 

    50 // argument handling

    51 // convert to internal class name

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

    53 var tool;

    54 if (arguments.length > 1) {

    55     tool = arguments[1];

    56     switch (tool) {

    57         case 'jdis':

    58         case 'jdec':

    59             break;

    60         default:

    61             usage();

    62     }

    63 } else {

    64     tool = "jdis"; // default tool

    65 }

    66 

    67 // Java classes used

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

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

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

    71 

    72 // retrive input stream for .class bytes

    73 var cl = AsmTools.class.classLoader;

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

    75 

    76 if (res) {

    77     var is = res.openStream();

    78     var tmpPath;

    79     try {

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

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

    82         // mark as delete-on-exit

    83         tmpPath.toFile().deleteOnExit();

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

    85     } finally {

    86         is.close();

    87     } 

    88 

    89     // invoke asmtools Main

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

    91 } else {

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

    93     exit(1);

    94 }