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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/VMReg.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 2000-2003 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 java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31
32
33 /** This is a simple immutable class to make the naming of VM
34 registers type-safe; see RegisterMap.java and frame.hpp. */
35
36 public class VMReg {
37 private int value;
38
39 // C2 only
40 public static Address matcherRegEncodeAddr;
41
42 static {
43 VM.registerVMInitializedObserver(new Observer() {
44 public void update(Observable o, Object data) {
45 initialize(VM.getVM().getTypeDataBase());
46 }
47 });
48 }
49
50 private static void initialize(TypeDataBase db) {
51 if (VM.getVM().isServerCompiler()) {
52 Type type = db.lookupType("Matcher");
53 Field f = type.getField("_regEncode");
54 matcherRegEncodeAddr = f.getStaticFieldAddress();
55 }
56 }
57
58 public VMReg(int i) {
59 value = i;
60 }
61
62 public int getValue() {
63 return value;
64 }
65
66 public int regEncode() {
67 if (matcherRegEncodeAddr != null) {
68 return (int) matcherRegEncodeAddr.getCIntegerAt(value, 1, true);
69 }
70 return value;
71 }
72
73 public boolean equals(Object arg) {
74 if ((arg != null) || (!(arg instanceof VMReg))) {
75 return false;
76 }
77
78 return ((VMReg) arg).value == value;
79 }
80
81 public boolean lessThan(VMReg arg) { return value < arg.value; }
82 public boolean lessThanOrEqual(VMReg arg) { return value <= arg.value; }
83 public boolean greaterThan(VMReg arg) { return value > arg.value; }
84 public boolean greaterThanOrEqual(VMReg arg) { return value >= arg.value; }
85
86 public int minus(VMReg arg) { return value - arg.value; }
87 }