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comparison agent/src/share/classes/sun/jvm/hotspot/code/VMRegImpl.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 2006 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.code;
26
27 import java.util.*;
28
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.runtime.*;
31 import sun.jvm.hotspot.types.*;
32 import sun.jvm.hotspot.utilities.*;
33
34 public class VMRegImpl {
35
36 private static VMReg stack0;
37 private static int stack0Val;
38 private static Address stack0Addr;
39 private static AddressField regNameField;
40
41 static {
42 VM.registerVMInitializedObserver(new Observer() {
43 public void update(Observable o, Object data) {
44 initialize(VM.getVM().getTypeDataBase());
45 }
46 });
47 }
48
49 private static void initialize(TypeDataBase db) {
50 Type type = db.lookupType("VMRegImpl");
51 AddressField stack0Field = type.getAddressField("stack0");
52 stack0Addr = stack0Field.getValue();
53 stack0Val = (int) stack0Addr.hashCode();
54 stack0 = new VMReg(stack0Val);
55 regNameField = type.getAddressField("regName[0]");
56 }
57
58 public static VMReg getStack0() {
59 return stack0;
60 }
61
62 public static String getRegisterName(int index) {
63 if (Assert.ASSERTS_ENABLED) {
64 Assert.that(index >= 0 && index < stack0Val, "invalid index : " + index);
65 }
66 Address regName = regNameField.getStaticFieldAddress();
67 long addrSize = VM.getVM().getAddressSize();
68 return CStringUtilities.getString(regName.getAddressAt(index * addrSize));
69 }
70 }