| /* |
| * Copyright (c) 2017, 2019, 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. |
| */ |
| |
| /* |
| * @test ArraysNewInstanceBug |
| * @bug 8182397 |
| * @summary race in setting array_klass field for component mirror with mirror update for klass |
| * @modules java.base/jdk.internal.misc |
| * @run main/othervm -Xcomp ArraysNewInstanceBug |
| */ |
| |
| // This test crashes in compiled code with race, because the compiler generates code that assumes this ordering. |
| import java.lang.reflect.Array; |
| import java.io.File; |
| import java.net.URL; |
| import java.net.URLClassLoader; |
| |
| public class ArraysNewInstanceBug implements Runnable { |
| static Class<?>[] classes; |
| |
| int start; |
| |
| ArraysNewInstanceBug(int start) { |
| this.start = start; |
| } |
| |
| String[] result; |
| |
| public void run() { |
| result = new String[classes.length]; |
| System.err.print('.'); |
| for (int i = start; i < classes.length; i++) { |
| result[i] = Array.newInstance(classes[i], 0).getClass().getName(); |
| } |
| } |
| |
| public static void main(String[] args) throws Throwable { |
| Class<?> c = ArraysNewInstanceBug.class; |
| ClassLoader apploader = c.getClassLoader(); |
| File testClasses = new File(System.getProperty("test.classes")); |
| for (int iter = 0; iter < 10 ; iter++) { // 10 is enough to get it to crash on my machine. |
| System.err.print('['); |
| classes = new Class<?>[1000]; |
| for (int i = 0; i < classes.length; i++) { |
| ClassLoader loader = new URLClassLoader(new URL[] { testClasses.toURI().toURL() }, apploader.getParent()); |
| classes[i] = loader.loadClass(c.getSimpleName()); |
| } |
| System.err.print(']'); |
| System.err.print('('); |
| int threadCount = 64; |
| Thread[] threads = new Thread[threadCount]; |
| for (int i = 0; i < threads.length; i++) { |
| threads[i] = new Thread(new ArraysNewInstanceBug(i)); |
| } |
| for (int i = 0; i < threads.length; i++) { |
| threads[i].start(); |
| } |
| for (int i = 0; i < threads.length; i++) { |
| threads[i].join(); |
| } |
| System.err.print(')'); |
| } |
| } |
| } |