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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/JavaCallWrapper.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 2000-2005 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 import sun.jvm.hotspot.debugger.*;
29 import sun.jvm.hotspot.types.*;
30
31 /** <P> A JavaCallWrapper is constructed before each JavaCall and
32 destroyed after the call. Its purpose is to allocate/deallocate a
33 new handle block and to save/restore the last Java fp/sp. A
34 pointer to the JavaCallWrapper is stored on the stack. </P>
35
36 <P> NOTE: this port is very minimal and is only designed to get
37 frame traversal working. FIXME: we will have to add platform-
38 specific stuff later and therefore a factory for these
39 objects. </P> */
40
41 public class JavaCallWrapper extends VMObject {
42 protected static AddressField anchorField;
43 private static AddressField lastJavaSPField;
44 private static AddressField lastJavaPCField;
45
46 static {
47 VM.registerVMInitializedObserver(new Observer() {
48 public void update(Observable o, Object data) {
49 initialize(VM.getVM().getTypeDataBase());
50 }
51 });
52 }
53
54 private static synchronized void initialize(TypeDataBase db) {
55 Type type = db.lookupType("JavaCallWrapper");
56 Type anchorType = db.lookupType("JavaFrameAnchor");
57
58 anchorField = type.getAddressField("_anchor");
59 lastJavaSPField = anchorType.getAddressField("_last_Java_sp");
60 lastJavaPCField = anchorType.getAddressField("_last_Java_pc");
61 }
62
63 public JavaCallWrapper(Address addr) {
64 super(addr);
65 }
66
67 public Address getLastJavaSP() {
68 return lastJavaSPField.getValue(addr.addOffsetTo(anchorField.getOffset()));
69 }
70
71 public Address getLastJavaPC() {
72 return lastJavaPCField.getValue(addr.addOffsetTo(anchorField.getOffset()));
73 }
74
75 }