115 lines
4.0 KiB
Java
115 lines
4.0 KiB
Java
/*
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* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package vm.mlvm.tools;
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import java.io.File;
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import vm.share.UnsafeAccess;
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import vm.share.FileUtils;
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import vm.mlvm.share.CustomClassLoaders;
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import vm.mlvm.anonloader.share.AnonkTestee01;
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import vm.mlvm.share.Env;
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/**
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* A tool, which loads a class file specified in command line into VM using:
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* <ul>
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* <li>A custom class loader,
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* <li>{@link sun.misc.Unsafe#defineAnonymousClass(Class, byte[], Object[])}
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* call.
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* </ul>
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*
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* <p>Syntax:
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* <pre>{@code
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* $ java [options...] vm.mlvm.tool.LoadClass class-file-name [class-FQDN]
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* }</pre>
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*
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* The first argument, class file name is mandatory.
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* The second one is optional — a fully qualified class name.
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* If the second argument is not specified, it is constructed from the first
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* argument, replacing '/' with '.'
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*
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* <p>The tool can be used for investigating failures of vm.mlvm.anon tests.
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*
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*/
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public class LoadClass {
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private static final Class<?> HOST_CLASS = AnonkTestee01.class;
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private static void usage() {
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System.out.println("Usage: java " + LoadClass.class.getName()
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+ " <class-file-to-load> [class-name]");
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}
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/**
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* Runs the tool.
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* @param args Tool arguments
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*/
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@SuppressWarnings("deprecation")
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public static void main(String[] args) {
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if (args.length < 1) {
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usage();
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System.exit(1);
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}
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try {
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final String classFileName = args[0];
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final String className = (args.length > 1) ? args[1]
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: classFileName.replaceAll("\\.class$", "")
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.replace("/", ".");
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final byte[] classBytes = FileUtils
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.readFile(new File(classFileName));
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Env.traceImportant("Loading class '%s' from file '%s'...",
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className, classFileName);
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Env.traceImportant("...using custom ClassLoader");
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try {
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ClassLoader cl = CustomClassLoaders
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.makeClassBytesLoader(classBytes, className);
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Class<?> c = cl.loadClass(className);
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c.newInstance();
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Env.traceImportant("OK");
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} catch (Throwable e) {
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Env.traceImportant(e,
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"Couldn't load class '%s' via custom ClassLoader",
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classFileName);
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}
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Env.traceImportant(
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"...using sun.misc.Unsafe.defineAnonymousClass():");
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try {
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Class<?> c = UnsafeAccess.unsafe.defineAnonymousClass(HOST_CLASS,
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classBytes, new Object[0]);
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c.newInstance();
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Env.traceImportant("OK");
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} catch (Throwable e) {
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Env.traceImportant(e, "Couldn't load class '%s' via sun.misc."
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+ "Unsafe.defineAnonymousClass()", classFileName);
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}
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} catch (Throwable e) {
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Env.traceImportant(e, "Can't load class");
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}
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}
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}
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