hotspot/test/runtime/Unsafe/GetUncompressedObject.java
author ctornqvi
Thu, 25 Aug 2016 08:40:53 -0400
changeset 40855 3c4c913195e3
parent 40631 ed82623d7831
child 41092 c388d897472d
permissions -rw-r--r--
8164737: Remove Unsafe dependency from ProcessTools Reviewed-by: gtriantafill, dholmes
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/*
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 * Copyright (c) 2015, 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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/* @test
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 * @bug 8022853
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 * @library /test/lib
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 * @modules java.base/jdk.internal.misc
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 * @run main GetUncompressedObject
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 */
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import static jdk.test.lib.Asserts.*;
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import jdk.test.lib.unsafe.UnsafeHelper;
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import jdk.internal.misc.Unsafe;
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public class GetUncompressedObject {
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    public static void main(String args[]) throws Exception {
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        Unsafe unsafe = UnsafeHelper.getUnsafe();
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        // Allocate some memory and fill it with non-zero values.
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        final int size = 32;
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        final long address = unsafe.allocateMemory(size);
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        unsafe.setMemory(address, size, (byte) 0x23);
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        // The only thing we can do is check for null-ness.
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        // So, store a null somewhere.
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        unsafe.putAddress(address + 16, 0);
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        Object nullObj = unsafe.getUncompressedObject(address + 16);
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        if (nullObj != null) {
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            throw new InternalError("should be null");
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        }
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    }
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}