test/hotspot/jtreg/compiler/profiling/UnsafeAccess.java
author erikj
Tue, 12 Sep 2017 19:03:39 +0200
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parent 45514 hotspot/test/compiler/profiling/UnsafeAccess.java@0fc9cc73ce45
child 52220 9c260a6b6471
permissions -rw-r--r--
8187443: Forest Consolidation: Move files to unified layout Reviewed-by: darcy, ihse
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/*
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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.putObject(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.getObject(o, off);
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            U.compareAndSetObject(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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}