/* * Copyright (c) 2020, 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 * @bug 8255466 * @summary unsafe access to static field causes crash * @modules java.base/jdk.internal.misc * * @run main/othervm -Xcomp -XX:CompileCommand=compileonly,TestUnsafeStaticFieldAccess::* TestUnsafeStaticFieldAccess * */ import jdk.internal.misc.Unsafe; import java.lang.reflect.Field; public class TestUnsafeStaticFieldAccess { private static final Unsafe UNSAFE = Unsafe.getUnsafe(); private static final long offset; private static volatile Class clazz; private static int field; static { long o = 0; for (Field f : TestUnsafeStaticFieldAccess.class.getDeclaredFields()) { if (f.getName().equals("field")) { o = UNSAFE.staticFieldOffset(f); break; } } offset = o; clazz = TestUnsafeStaticFieldAccess.class; } public static void main(String[] args) { for (int i = 0; i < 12000; i++) { UNSAFE.getInt(clazz, offset); } } }