/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package jdk.nashorn.internal.codegen;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import jdk.nashorn.internal.runtime.ECMAErrors;
import jdk.nashorn.internal.runtime.ScriptEnvironment;
import jdk.nashorn.internal.runtime.logging.DebugLogger;

Class that facilitates printing bytecode and dumping it to disk.
/** * Class that facilitates printing bytecode and dumping it to disk. */
public final class DumpBytecode {
Dump bytecode to console and potentially disk.
Params:
  • env – the script environment defining options for printing bytecode
  • logger – a logger used to write diagnostics about bytecode dumping
  • bytecode – the actual code to dump
  • className – the name of the class being dumped
/** * Dump bytecode to console and potentially disk. * @param env the script environment defining options for printing bytecode * @param logger a logger used to write diagnostics about bytecode dumping * @param bytecode the actual code to dump * @param className the name of the class being dumped */
public static void dumpBytecode(final ScriptEnvironment env, final DebugLogger logger, final byte[] bytecode, final String className) { File dir = null; try { // should could be printed to stderr for generate class? if (env._print_code) { final StringBuilder sb = new StringBuilder(); sb.append("class: ").append(className). append('\n'). append(ClassEmitter.disassemble(bytecode)). append("====="); if (env._print_code_dir != null) { String name = className; final int dollar = name.lastIndexOf('$'); if (dollar != -1) { name = name.substring(dollar + 1); } dir = new File(env._print_code_dir); if (!dir.exists() && !dir.mkdirs()) { throw new IOException(dir.toString()); } File file; String fileName; int uniqueId = 0; do { fileName = name + (uniqueId == 0 ? "" : "_" + uniqueId) + ".bytecode"; file = new File(env._print_code_dir, fileName); uniqueId++; } while (file.exists()); try (final PrintWriter pw = new PrintWriter(new FileOutputStream(file))) { pw.print(sb.toString()); pw.flush(); } } else { env.getErr().println(sb); } } // should code be dumped to disk if (env._dest_dir != null) { final String fileName = className.replace('.', File.separatorChar) + ".class"; final int index = fileName.lastIndexOf(File.separatorChar); if (index != -1) { dir = new File(env._dest_dir, fileName.substring(0, index)); } else { dir = new File(env._dest_dir); } if (!dir.exists() && !dir.mkdirs()) { throw new IOException(dir.toString()); } final File file = new File(env._dest_dir, fileName); try (final FileOutputStream fos = new FileOutputStream(file)) { fos.write(bytecode); } logger.info("Wrote class to '" + file.getAbsolutePath() + '\''); } } catch (final IOException e) { logger.warning("Skipping class dump for ", className, ": ", ECMAErrors.getMessage( "io.error.cant.write", dir.toString())); } } }