76 lines
3.0 KiB
JavaScript
76 lines
3.0 KiB
JavaScript
/*
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* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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// Usage: jjs disassemble.js -- <.class-file-path>
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// Simple .class disassembler that uses bundled ObjectWeb ASM
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// classes in jdk8. WARNING: Bundled ObjectWeb ASM classes are
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// not part of official jdk8 API. It can be changed/removed
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// without notice. So, this script is brittle by design!
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// This example demonstrates passing arguments to script
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// from jjs command line, nio and ASM usage.
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// classes used
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var FileSystems = Java.type("java.nio.file.FileSystems");
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var Files = Java.type("java.nio.file.Files");
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var System = Java.type("java.lang.System");
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var PrintWriter = Java.type("java.io.PrintWriter");
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// WARNING: uses non-API classes of jdk8!
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var ClassReader = Java.type("jdk.internal.org.objectweb.asm.ClassReader");
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var TraceClassVisitor = Java.type("jdk.internal.org.objectweb.asm.util.TraceClassVisitor");
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// convert file name to Path instance
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function path(file) {
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return FileSystems.default.getPath(file);
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}
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// read all file content as a byte[]
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function readAllBytes(file) {
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return Files.readAllBytes(path(file));
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}
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// disassemble .class byte[] and prints output to stdout
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function disassemble(bytecode) {
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var pw = new PrintWriter(System.out);
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new ClassReader(bytecode).accept(new TraceClassVisitor(pw), 0);
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}
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// check for command line arg (for .class file name)
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if (arguments.length == 0 || !arguments[0].endsWith('.class')) {
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print("Usage: jjs disassemble -- <.class file>");
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exit(1);
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}
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// disassemble the given .class file
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disassemble(readAllBytes(arguments[0]));
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