Wed, 07 Oct 2015 10:01:40 -0700
Merge
1 /*
2 * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of Oracle nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
32 // Usage: jjs disassemble.js -- <.class-file-path>
34 // Simple .class disassembler that uses bundled ObjectWeb ASM
35 // classes in jdk8. WARNING: Bundled ObjectWeb ASM classes are
36 // not part of official jdk8 API. It can be changed/removed
37 // without notice. So, this script is brittle by design!
39 // This example demonstrates passing arguments to script
40 // from jjs command line, nio and ASM usage.
42 // classes used
43 var FileSystems = Java.type("java.nio.file.FileSystems");
44 var Files = Java.type("java.nio.file.Files");
45 var System = Java.type("java.lang.System");
46 var PrintWriter = Java.type("java.io.PrintWriter");
48 // WARNING: uses non-API classes of jdk8!
49 var ClassReader = Java.type("jdk.internal.org.objectweb.asm.ClassReader");
50 var TraceClassVisitor = Java.type("jdk.internal.org.objectweb.asm.util.TraceClassVisitor");
52 // convert file name to Path instance
53 function path(file) {
54 return FileSystems.default.getPath(file);
55 }
57 // read all file content as a byte[]
58 function readAllBytes(file) {
59 return Files.readAllBytes(path(file));
60 }
62 // disassemble .class byte[] and prints output to stdout
63 function disassemble(bytecode) {
64 var pw = new PrintWriter(System.out);
65 new ClassReader(bytecode).accept(new TraceClassVisitor(pw), 0);
66 }
68 // check for command line arg (for .class file name)
69 if (arguments.length == 0 || !arguments[0].endsWith('.class')) {
70 print("Usage: jjs disassemble -- <.class file>");
71 exit(1);
72 }
74 // disassemble the given .class file
75 disassemble(readAllBytes(arguments[0]));