93 lines
3.1 KiB
Java
93 lines
3.1 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.
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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 8134918
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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:TypeProfileLevel=222 -XX:+UseTypeSpeculation -Xbatch
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* -XX:CompileCommand=dontinline,compiler.profiling.UnsafeAccess::test*
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* compiler.profiling.UnsafeAccess
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*/
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package compiler.profiling;
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import jdk.internal.misc.Unsafe;
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public class UnsafeAccess {
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private static final Unsafe U = Unsafe.getUnsafe();
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static Class cls = Object.class;
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static long off = U.ARRAY_OBJECT_BASE_OFFSET;
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static Object testUnsafeAccess(Object o, boolean isObjArray) {
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if (o != null && cls.isInstance(o)) { // speculates "o" type to int[]
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return helperUnsafeAccess(o, isObjArray);
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}
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return null;
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}
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static Object helperUnsafeAccess(Object o, boolean isObjArray) {
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if (isObjArray) {
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U.putReference(o, off, new Object());
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}
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return o;
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}
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static Object testUnsafeLoadStore(Object o, boolean isObjArray) {
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if (o != null && cls.isInstance(o)) { // speculates "o" type to int[]
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return helperUnsafeLoadStore(o, isObjArray);
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}
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return null;
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}
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static Object helperUnsafeLoadStore(Object o, boolean isObjArray) {
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if (isObjArray) {
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Object o1 = U.getReference(o, off);
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U.compareAndSetReference(o, off, o1, new Object());
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}
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return o;
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}
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public static void main(String[] args) {
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Object[] objArray = new Object[10];
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int[] intArray = new int[10];
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for (int i = 0; i < 20_000; i++) {
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helperUnsafeAccess(objArray, true);
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}
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for (int i = 0; i < 20_000; i++) {
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testUnsafeAccess(intArray, false);
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}
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for (int i = 0; i < 20_000; i++) {
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helperUnsafeLoadStore(objArray, true);
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}
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for (int i = 0; i < 20_000; i++) {
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testUnsafeLoadStore(intArray, false);
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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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