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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/Bytes.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.runtime;
26
27 import sun.jvm.hotspot.debugger.*;
28
29 /** Encapsulates some byte-swapping operations defined in the VM */
30
31 public class Bytes {
32 private boolean swap;
33
34 public Bytes(MachineDescription machDesc) {
35 swap = !machDesc.isBigEndian();
36 }
37
38 /** Should only swap if the hardware's underlying byte order is
39 different from Java's */
40 public short swapShort(short x) {
41 if (!swap)
42 return x;
43
44 return (short) (((x >> 8) & 0xFF) | (x << 8));
45 }
46
47 /** Should only swap if the hardware's underlying byte order is
48 different from Java's */
49 public int swapInt(int x) {
50 if (!swap)
51 return x;
52
53 return (swapShort((short) x) << 16) | (swapShort((short) (x >> 16)) & 0xFFFF);
54 }
55
56 /** Should only swap if the hardware's underlying byte order is
57 different from Java's */
58 public long swapLong(long x) {
59 if (!swap)
60 return x;
61
62 return (swapInt((int) x) << 32) | (swapInt((int) (x >> 32)) & 0xFFFFFFFF);
63 }
64 }