JOCL v2.6.0-rc-20250712
JOCL, OpenCL® API Binding for Java™ (public API).
InternalBufferUtil.java
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1/*
2 * Copyright 2009 - 2010 JogAmp Community. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without modification, are
5 * permitted provided that the following conditions are met:
6 *
7 * 1. Redistributions of source code must retain the above copyright notice, this list of
8 * conditions and the following disclaimer.
9 *
10 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
11 * of conditions and the following disclaimer in the documentation and/or other materials
12 * provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
16 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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19 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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27 */
28
29package com.jogamp.opencl;
30
31import java.lang.reflect.Field;
32import java.nio.Buffer;
33import sun.misc.Unsafe;
34
35/**
36 *
37 * @author Michael Bien
38 */
39class InternalBufferUtil {
40
41 private static final long addressFieldOffset;
42 private static Unsafe unsafe;
43
44 static {
45 try {
46 final Field f = Buffer.class.getDeclaredField("address");
47
48 final Field[] fields = Unsafe.class.getDeclaredFields();
49 for (int i = 0; i < fields.length; i++) {
50 if (fields[i].getName().equals("theUnsafe")) {
51 fields[i].setAccessible(true);
52 unsafe = (Unsafe)fields[i].get(Unsafe.class);
53 break;
54 }
55 }
56
57 addressFieldOffset = unsafe.objectFieldOffset(f);
58 } catch (final Exception e) {
59 throw new RuntimeException(e);
60 }
61 }
62
63 public static long getDirectBufferAddress(final Buffer buffer) {
64 return ((buffer == null) ? 0 : unsafe.getLong(buffer, addressFieldOffset));
65 }
66
67}