| /* |
| * 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 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])); |