Mercurial > hg > graal-jvmci-8
annotate agent/src/share/classes/sun/jvm/hotspot/types/CIntegerType.java @ 17524:89152779163c
Merge with jdk8-b132
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Wed, 15 Oct 2014 11:59:32 +0200 |
parents | c18cbe5936b8 |
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2 * Copyright (c) 2000, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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6941466: Oracle rebranding changes for Hotspot repositories
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 package sun.jvm.hotspot.types; | |
26 | |
27 import java.util.*; | |
28 | |
29 /** <P> This subinterface of Type provides accessors to deal with all | |
30 C integer types. The observation is that, according to the C | |
31 specification, there is no guarantee that the integer types of | |
32 char, short, int, and long will not all be of the same size, | |
33 meaning that it is incorrect to use any Java primitive type that | |
34 is too small to hold all of these values when talking about C | |
35 integer types, signed or unsigned. </P> | |
36 | |
37 <P> Therefore we use long, the largest Java primitive type, | |
38 universally to hold C integer field values (deciding that a | |
39 ubiquitous change to BigInteger is not currently advantageous). | |
40 Routines which read C integers from fields know the fields' sizes | |
41 and signedness and read the appropriate number of bytes and handle | |
42 sign- or zero- extension for signed and unsigned types, | |
43 respectively. Unfortunately, since long is a signed 64-bit | |
44 integer, there will be problems handling C's unsigned 64-bit | |
45 integers, but these problems must be dealt with by the user. </P> */ | |
46 public interface CIntegerType extends Type { | |
47 /** Is this integer type unsigned? */ | |
48 public boolean isUnsigned(); | |
49 | |
50 /** What is the maximum value of this type? Note that this will not | |
51 work properly for unsigned long longs. */ | |
52 public long maxValue(); | |
53 | |
54 /** What is the minimum value of this type? Note that this will not | |
55 work properly for unsigned long longs. */ | |
56 public long minValue(); | |
57 } |