aoqi@0: /*
aoqi@0:  * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
attila@962:  *
aoqi@0:  * Redistribution and use in source and binary forms, with or without
aoqi@0:  * modification, are permitted provided that the following conditions
aoqi@0:  * are met:
attila@962:  *
aoqi@0:  *   - Redistributions of source code must retain the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer.
attila@962:  *
aoqi@0:  *   - Redistributions in binary form must reproduce the above copyright
aoqi@0:  *     notice, this list of conditions and the following disclaimer in the
aoqi@0:  *     documentation and/or other materials provided with the distribution.
attila@962:  *
aoqi@0:  *   - Neither the name of Oracle nor the names of its
aoqi@0:  *     contributors may be used to endorse or promote products derived
aoqi@0:  *     from this software without specific prior written permission.
attila@962:  *
aoqi@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
aoqi@0:  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
aoqi@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
aoqi@0:  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
aoqi@0:  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
aoqi@0:  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
aoqi@0:  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
aoqi@0:  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
aoqi@0:  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
aoqi@0:  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
aoqi@0:  */
aoqi@0: 
aoqi@0: // Usage: jjs disassemble.js -- <.class-file-path>
aoqi@0: 
aoqi@0: // Simple .class disassembler that uses bundled ObjectWeb ASM
aoqi@0: // classes in jdk8. WARNING: Bundled ObjectWeb ASM classes are
attila@962: // not part of official jdk8 API. It can be changed/removed
aoqi@0: // without notice. So, this script is brittle by design!
aoqi@0: 
aoqi@0: // This example demonstrates passing arguments to script
aoqi@0: // from jjs command line, nio and ASM usage.
aoqi@0: 
aoqi@0: // classes used
aoqi@0: var FileSystems = Java.type("java.nio.file.FileSystems");
aoqi@0: var Files = Java.type("java.nio.file.Files");
aoqi@0: var System = Java.type("java.lang.System");
aoqi@0: var PrintWriter = Java.type("java.io.PrintWriter");
aoqi@0: 
aoqi@0: // WARNING: uses non-API classes of jdk8!
aoqi@0: var ClassReader = Java.type("jdk.internal.org.objectweb.asm.ClassReader");
aoqi@0: var TraceClassVisitor = Java.type("jdk.internal.org.objectweb.asm.util.TraceClassVisitor");
aoqi@0: 
aoqi@0: // convert file name to Path instance
aoqi@0: function path(file) {
aoqi@0:     return FileSystems.default.getPath(file);
aoqi@0: }
aoqi@0: 
aoqi@0: // read all file content as a byte[]
aoqi@0: function readAllBytes(file) {
aoqi@0:     return Files.readAllBytes(path(file));
aoqi@0: }
aoqi@0: 
aoqi@0: // disassemble .class byte[] and prints output to stdout
aoqi@0: function disassemble(bytecode) {
aoqi@0:     var pw = new PrintWriter(System.out);
aoqi@0:     new ClassReader(bytecode).accept(new TraceClassVisitor(pw), 0);
aoqi@0: }
aoqi@0: 
aoqi@0: // check for command line arg (for .class file name)
aoqi@0: if (arguments.length == 0 || !arguments[0].endsWith('.class')) {
aoqi@0:     print("Usage: jjs disassemble -- <.class file>");
aoqi@0:     exit(1);
aoqi@0: }
aoqi@0: 
aoqi@0: // disassemble the given .class file
aoqi@0: disassemble(readAllBytes(arguments[0]));