1 /* 2 * Copyright (c) 2018, Red Hat, Inc. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package compiler.c2.aarch64; 25 26 import java.lang.reflect.Field; 27 import jdk.internal.misc.Unsafe; 28 29 class TestUnsafeVolatileStore 30 { 31 public volatile int f_int = 0; 32 public volatile Integer f_obj = Integer.valueOf(0); 33 34 public static Unsafe unsafe = Unsafe.getUnsafe(); 35 public static Field f_int_field; 36 public static Field f_obj_field; 37 public static long f_int_off; 38 public static long f_obj_off; 39 40 static { 41 try { 42 f_int_field = TestUnsafeVolatileStore.class.getField("f_int"); 43 f_obj_field = TestUnsafeVolatileStore.class.getField("f_obj"); 44 f_int_off = unsafe.objectFieldOffset(f_int_field); 45 f_obj_off = unsafe.objectFieldOffset(f_obj_field); 46 } catch (Exception e) { 47 System.out.println("reflection failed " + e); 48 e.printStackTrace(); 49 } 50 } 51 52 public static void main(String[] args) 53 { 54 final TestUnsafeVolatileStore t = new TestUnsafeVolatileStore(); 55 for (int i = 0; i < 100_000; i++) { 56 t.f_int = -1; 57 t.testInt(i); 58 if (t.f_int != i) { 59 throw new RuntimeException("bad result!"); 60 } 61 } 62 for (int i = 0; i < 100_000; i++) { 63 t.f_obj = null; 64 t.testObj(Integer.valueOf(i)); 65 if (t.f_obj != i) { 66 throw new RuntimeException("bad result!"); 67 } 68 } 69 } 70 public void testInt(int i) 71 { 72 unsafe.putIntVolatile(this, f_int_off, i); 73 } 74 75 public void testObj(Object o) 76 { 77 unsafe.putObjectVolatile(this, f_obj_off, o); 78 } 79 }