1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/test/compiler/unsafe/OpaqueAccesses.java Wed Nov 23 23:10:03 2016 -0800
1.3 @@ -0,0 +1,134 @@
1.4 +/*
1.5 + * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +/*
1.30 + * @test
1.31 + * @bug 8155781
1.32 + * @modules java.base/jdk.internal.misc
1.33 + *
1.34 + * @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions
1.35 + * -XX:-TieredCompilation -Xbatch
1.36 + * -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test*
1.37 + * compiler.unsafe.OpaqueAccesses
1.38 + */
1.39 +package compiler.unsafe;
1.40 +
1.41 +import sun.misc.Unsafe;
1.42 +
1.43 +import java.lang.reflect.Field;
1.44 +
1.45 +public class OpaqueAccesses {
1.46 + private static final Unsafe UNSAFE = Unsafe.getUnsafe();
1.47 +
1.48 + private static final Object INSTANCE = new OpaqueAccesses();
1.49 +
1.50 + private static final Object[] ARRAY = new Object[10];
1.51 +
1.52 + private static final long F_OFFSET;
1.53 + private static final long E_OFFSET;
1.54 +
1.55 + static {
1.56 + try {
1.57 + Field field = OpaqueAccesses.class.getDeclaredField("f");
1.58 + F_OFFSET = UNSAFE.objectFieldOffset(field);
1.59 +
1.60 + E_OFFSET = UNSAFE.arrayBaseOffset(ARRAY.getClass());
1.61 + } catch (NoSuchFieldException e) {
1.62 + throw new Error(e);
1.63 + }
1.64 + }
1.65 +
1.66 + private Object f = new Object();
1.67 +
1.68 + static Object testFixedOffsetField(Object o) {
1.69 + return UNSAFE.getObject(o, F_OFFSET);
1.70 + }
1.71 +
1.72 + static int testFixedOffsetHeader0(Object o) {
1.73 + return UNSAFE.getInt(o, 0);
1.74 + }
1.75 +
1.76 + static int testFixedOffsetHeader4(Object o) {
1.77 + return UNSAFE.getInt(o, 4);
1.78 + }
1.79 +
1.80 + static Object testFixedBase(long off) {
1.81 + return UNSAFE.getObject(INSTANCE, off);
1.82 + }
1.83 +
1.84 + static Object testOpaque(Object o, long off) {
1.85 + return UNSAFE.getObject(o, off);
1.86 + }
1.87 +
1.88 + static int testFixedOffsetHeaderArray0(Object[] arr) {
1.89 + return UNSAFE.getInt(arr, 0);
1.90 + }
1.91 +
1.92 + static int testFixedOffsetHeaderArray4(Object[] arr) {
1.93 + return UNSAFE.getInt(arr, 4);
1.94 + }
1.95 +
1.96 + static Object testFixedOffsetArray(Object[] arr) {
1.97 + return UNSAFE.getObject(arr, E_OFFSET);
1.98 + }
1.99 +
1.100 + static Object testFixedBaseArray(long off) {
1.101 + return UNSAFE.getObject(ARRAY, off);
1.102 + }
1.103 +
1.104 + static Object testOpaqueArray(Object[] o, long off) {
1.105 + return UNSAFE.getObject(o, off);
1.106 + }
1.107 +
1.108 + static final long ADDR = UNSAFE.allocateMemory(10);
1.109 + static boolean flag;
1.110 +
1.111 + static int testMixedAccess() {
1.112 + flag = !flag;
1.113 + Object o = (flag ? INSTANCE : null);
1.114 + long off = (flag ? F_OFFSET : ADDR);
1.115 + return UNSAFE.getInt(o, off);
1.116 + }
1.117 +
1.118 + public static void main(String[] args) {
1.119 + for (int i = 0; i < 20_000; i++) {
1.120 + // Instance
1.121 + testFixedOffsetField(INSTANCE);
1.122 + testFixedOffsetHeader0(INSTANCE);
1.123 + testFixedOffsetHeader4(INSTANCE);
1.124 + testFixedBase(F_OFFSET);
1.125 + testOpaque(INSTANCE, F_OFFSET);
1.126 + testMixedAccess();
1.127 +
1.128 + // Array
1.129 + testFixedOffsetHeaderArray0(ARRAY);
1.130 + testFixedOffsetHeaderArray4(ARRAY);
1.131 + testFixedOffsetArray(ARRAY);
1.132 + testFixedBaseArray(E_OFFSET);
1.133 + testOpaqueArray(ARRAY, E_OFFSET);
1.134 + }
1.135 + System.out.println("TEST PASSED");
1.136 + }
1.137 +}
