jd.js revision 1157:04808fb1b059 
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
41function usage() {
42    print("Usage: jjs -cp <asmtools.jar> jd.js -- <classname> [jdis|jdec]");
43    exit(1);
44}
45
46if (arguments.length == 0) {
47    usage();
48}
49
50// argument handling
51// convert to internal class name
52var className = arguments[0].replaceAll('\\.', '/');
53var tool;
54if (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
68var AsmTools = Java.type("org.openjdk.asmtools.Main");
69var Files = Java.type("java.nio.file.Files");
70var StandardCopyOption = Java.type("java.nio.file.StandardCopyOption");
71
72// retrive input stream for .class bytes
73var cl = AsmTools.class.classLoader;
74var res = cl.getResource(className + ".class");
75
76if (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}
95