Mercurial > jdk8-mips64-public > nashorn / file comparison
comparison: samples/disassemble.js
samples/disassemble.js
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| 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 */ | |
| 31 | |
| 32 // Usage: jjs disassemble.js -- <.class-file-path> | |
| 33 | |
| 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! | |
| 38 | |
| 39 // This example demonstrates passing arguments to script | |
| 40 // from jjs command line, nio and ASM usage. | |
| 41 | |
| 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"); | |
| 47 | |
| 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"); | |
| 51 | |
| 52 // convert file name to Path instance | |
| 53 function path(file) { | |
| 54 return FileSystems.default.getPath(file); | |
| 55 } | |
| 56 | |
| 57 // read all file content as a byte[] | |
| 58 function readAllBytes(file) { | |
| 59 return Files.readAllBytes(path(file)); | |
| 60 } | |
| 61 | |
| 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 } | |
| 67 | |
| 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 } | |
| 73 | |
| 74 // disassemble the given .class file | |
| 75 disassemble(readAllBytes(arguments[0])); |
