| /* |
| * Copyright (c) 2016, 2018, 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. |
| * |
| * 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 vm.mlvm.tools; |
| |
| import java.io.File; |
| import vm.share.UnsafeAccess; |
| import vm.share.FileUtils; |
| import vm.mlvm.share.CustomClassLoaders; |
| import vm.mlvm.anonloader.share.AnonkTestee01; |
| |
| import vm.mlvm.share.Env; |
| |
| /** |
| * A tool, which loads a class file specified in command line into VM using: |
| * <ul> |
| * <li>A custom class loader, |
| * <li>{@link sun.misc.Unsafe#defineAnonymousClass(Class, byte[], Object[])} |
| * call. |
| * </ul> |
| * |
| * <p>Syntax: |
| * <pre>{@code |
| * $ java [options...] vm.mlvm.tool.LoadClass class-file-name [class-FQDN] |
| * }</pre> |
| * |
| * The first argument, class file name is mandatory. |
| * The second one is optional — a fully qualified class name. |
| * If the second argument is not specified, it is constructed from the first |
| * argument, replacing '/' with '.' |
| * |
| * <p>The tool can be used for investigating failures of vm.mlvm.anon tests. |
| * |
| */ |
| public class LoadClass { |
| |
| private static final Class<?> HOST_CLASS = AnonkTestee01.class; |
| |
| private static void usage() { |
| System.out.println("Usage: java " + LoadClass.class.getName() |
| + " <class-file-to-load> [class-name]"); |
| } |
| |
| /** |
| * Runs the tool. |
| * @param args Tool arguments |
| */ |
| @SuppressWarnings("deprecation") |
| public static void main(String[] args) { |
| if (args.length < 1) { |
| usage(); |
| System.exit(1); |
| } |
| |
| try { |
| final String classFileName = args[0]; |
| final String className = (args.length > 1) ? args[1] |
| : classFileName.replaceAll("\\.class$", "") |
| .replace("/", "."); |
| final byte[] classBytes = FileUtils |
| .readFile(new File(classFileName)); |
| |
| Env.traceImportant("Loading class '%s' from file '%s'...", |
| className, classFileName); |
| |
| Env.traceImportant("...using custom ClassLoader"); |
| try { |
| ClassLoader cl = CustomClassLoaders |
| .makeClassBytesLoader(classBytes, className); |
| Class<?> c = cl.loadClass(className); |
| c.newInstance(); |
| Env.traceImportant("OK"); |
| } catch (Throwable e) { |
| Env.traceImportant(e, |
| "Couldn't load class '%s' via custom ClassLoader", |
| classFileName); |
| } |
| |
| Env.traceImportant( |
| "...using sun.misc.Unsafe.defineAnonymousClass():"); |
| try { |
| Class<?> c = UnsafeAccess.unsafe.defineAnonymousClass(HOST_CLASS, |
| classBytes, new Object[0]); |
| c.newInstance(); |
| Env.traceImportant("OK"); |
| } catch (Throwable e) { |
| Env.traceImportant(e, "Couldn't load class '%s' via sun.misc." |
| + "Unsafe.defineAnonymousClass()", classFileName); |
| } |
| } catch (Throwable e) { |
| Env.traceImportant(e, "Can't load class"); |
| } |
| } |
| } |