135 lines
4.2 KiB
Java
135 lines
4.2 KiB
Java
/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8155781
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* @modules java.base/jdk.internal.misc
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*
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* @run main/bootclasspath/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions
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* -XX:-TieredCompilation -Xbatch
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* -XX:CompileCommand=dontinline,compiler.unsafe.OpaqueAccesses::test*
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* compiler.unsafe.OpaqueAccesses
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*/
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package compiler.unsafe;
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import jdk.internal.misc.Unsafe;
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import java.lang.reflect.Field;
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public class OpaqueAccesses {
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private static final Unsafe UNSAFE = Unsafe.getUnsafe();
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private static final Object INSTANCE = new OpaqueAccesses();
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private static final Object[] ARRAY = new Object[10];
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private static final long F_OFFSET;
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private static final long E_OFFSET;
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static {
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try {
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Field field = OpaqueAccesses.class.getDeclaredField("f");
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F_OFFSET = UNSAFE.objectFieldOffset(field);
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E_OFFSET = UNSAFE.arrayBaseOffset(ARRAY.getClass());
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} catch (NoSuchFieldException e) {
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throw new Error(e);
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}
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}
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private Object f = new Object();
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static Object testFixedOffsetField(Object o) {
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return UNSAFE.getObject(o, F_OFFSET);
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}
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static int testFixedOffsetHeader0(Object o) {
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return UNSAFE.getInt(o, 0);
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}
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static int testFixedOffsetHeader4(Object o) {
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return UNSAFE.getInt(o, 4);
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}
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static Object testFixedBase(long off) {
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return UNSAFE.getObject(INSTANCE, off);
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}
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static Object testOpaque(Object o, long off) {
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return UNSAFE.getObject(o, off);
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}
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static int testFixedOffsetHeaderArray0(Object[] arr) {
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return UNSAFE.getInt(arr, 0);
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}
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static int testFixedOffsetHeaderArray4(Object[] arr) {
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return UNSAFE.getInt(arr, 4);
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}
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static Object testFixedOffsetArray(Object[] arr) {
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return UNSAFE.getObject(arr, E_OFFSET);
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}
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static Object testFixedBaseArray(long off) {
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return UNSAFE.getObject(ARRAY, off);
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}
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static Object testOpaqueArray(Object[] o, long off) {
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return UNSAFE.getObject(o, off);
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}
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static final long ADDR = UNSAFE.allocateMemory(10);
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static boolean flag;
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static int testMixedAccess() {
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flag = !flag;
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Object o = (flag ? INSTANCE : null);
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long off = (flag ? F_OFFSET : ADDR);
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return UNSAFE.getInt(o, off);
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}
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public static void main(String[] args) {
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for (int i = 0; i < 20_000; i++) {
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// Instance
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testFixedOffsetField(INSTANCE);
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testFixedOffsetHeader0(INSTANCE);
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testFixedOffsetHeader4(INSTANCE);
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testFixedBase(F_OFFSET);
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testOpaque(INSTANCE, F_OFFSET);
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testMixedAccess();
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// Array
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testFixedOffsetHeaderArray0(ARRAY);
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testFixedOffsetHeaderArray4(ARRAY);
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testFixedOffsetArray(ARRAY);
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testFixedBaseArray(E_OFFSET);
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testOpaqueArray(ARRAY, E_OFFSET);
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}
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System.out.println("TEST PASSED");
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}
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}
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