/* * Copyright (c) 2014, 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, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */// 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 usedvar 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 instancefunction 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 stdoutfunction 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 filedisassemble(readAllBytes(arguments[0]));