Mercurial > jdk8-mips64-public > nashorn / file revision

 /*

  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.

  *

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  *     from this software without specific prior written permission.

  *

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

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

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 // Usage: jjs disassemble.js -- <.class-file-path>

 // Simple .class disassembler that uses bundled ObjectWeb ASM

 // classes in jdk8. WARNING: Bundled ObjectWeb ASM classes are

 // not part of official jdk8 API. It can be changed/removed

 // without notice. So, this script is brittle by design!

 // This example demonstrates passing arguments to script

 // from jjs command line, nio and ASM usage.

 // classes used

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

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

 var System = Java.type("java.lang.System");

 var PrintWriter = Java.type("java.io.PrintWriter");

 // WARNING: uses non-API classes of jdk8!

 var ClassReader = Java.type("jdk.internal.org.objectweb.asm.ClassReader");

 var TraceClassVisitor = Java.type("jdk.internal.org.objectweb.asm.util.TraceClassVisitor");

 // convert file name to Path instance

 function path(file) {

     return FileSystems.default.getPath(file);

 }

 // read all file content as a byte[]

 function readAllBytes(file) {

     return Files.readAllBytes(path(file));

 }

 // disassemble .class byte[] and prints output to stdout

 function disassemble(bytecode) {

     var pw = new PrintWriter(System.out);

     new ClassReader(bytecode).accept(new TraceClassVisitor(pw), 0);

 }

 // check for command line arg (for .class file name)

 if (arguments.length == 0 || !arguments[0].endsWith('.class')) {

     print("Usage: jjs disassemble -- <.class file>");

     exit(1);

 }

 // disassemble the given .class file

 disassemble(readAllBytes(arguments[0]));