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comparison agent/src/share/classes/sun/jvm/hotspot/debugger/MachineDescriptionTwosComplement.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 2000-2001 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.debugger;
26
27 /** Base class for all twos-complement machine descriptions, which
28 handles the cIntegerType{Min,Max}Value methods. */
29
30 public abstract class MachineDescriptionTwosComplement {
31
32 /** Handles 1, 2, 4, and 8-byte signed integers */
33 private static final long[] signedMinValues = {
34 Byte.MIN_VALUE,
35 Short.MIN_VALUE,
36 Integer.MIN_VALUE,
37 Long.MIN_VALUE
38 };
39
40 /** Handles 1, 2, 4, and 8-byte signed integers */
41 private static final long[] signedMaxValues = {
42 Byte.MAX_VALUE,
43 Short.MAX_VALUE,
44 Integer.MAX_VALUE,
45 Long.MAX_VALUE
46 };
47
48 /** Handles 1, 2, and 4-byte unsigned integers properly, with a bug
49 in the 8-byte unsigned integer's constant */
50 private static final long[] unsignedMaxValues = {
51 255L,
52 65535L,
53 4294967295L,
54 -1L
55 };
56
57 public long cIntegerTypeMaxValue(long sizeInBytes, boolean isUnsigned) {
58 if (isUnsigned) {
59 // Would be nice to signal to the caller that 8-byte unsigned
60 // integers are not supported properly, but it looks like doing
61 // so at this level will cause problems above
62
63 return tableLookup(sizeInBytes, unsignedMaxValues);
64 } else {
65 return tableLookup(sizeInBytes, signedMaxValues);
66 }
67 };
68
69 public long cIntegerTypeMinValue(long sizeInBytes, boolean isUnsigned) {
70 if (isUnsigned) {
71 return 0;
72 }
73
74 return tableLookup(sizeInBytes, signedMinValues);
75 }
76
77 // Nearly all of the supported machines are not LP64 */
78 public boolean isLP64() {
79 return false;
80 }
81
82 private long tableLookup(long sizeInBytes, long[] table) {
83 switch ((int) sizeInBytes) {
84 case 1:
85 return table[0];
86 case 2:
87 return table[1];
88 case 4:
89 return table[2];
90 case 8:
91 return table[3];
92 default:
93 throw new IllegalArgumentException("C integer type of " + sizeInBytes + " not supported");
94 }
95 }
96 }