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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/ThreadLocalAllocBuffer.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2006 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.runtime;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.debugger.*;
30 import sun.jvm.hotspot.types.*;
31
32 /** <P> ThreadLocalAllocBuffer: a descriptor for thread-local storage
33 used by the threads for allocation. </P>
34
35 <P> It is thread-private at any time, but maybe multiplexed over
36 time across multiple threads. </P> */
37
38 public class ThreadLocalAllocBuffer extends VMObject {
39 private static AddressField startField;
40 private static AddressField topField;
41 private static AddressField endField;
42 private static CIntegerField desired_sizeField;
43
44 static {
45 VM.registerVMInitializedObserver(new Observer() {
46 public void update(Observable o, Object data) {
47 initialize(VM.getVM().getTypeDataBase());
48 }
49 });
50 }
51
52 private static synchronized void initialize(TypeDataBase db) {
53 Type type = db.lookupType("ThreadLocalAllocBuffer");
54
55 startField = type.getAddressField("_start");
56 topField = type.getAddressField("_top");
57 endField = type.getAddressField("_end");
58 desired_sizeField = type.getCIntegerField("_desired_size");
59 }
60
61 public ThreadLocalAllocBuffer(Address addr) {
62 super(addr);
63 }
64
65 public Address start() { return startField.getValue(addr); }
66 public Address end() { return endField.getValue(addr); }
67 public Address top() { return topField.getValue(addr); }
68
69 /** Support for iteration over heap -- not sure how this will
70 interact with GC in reflective system, but necessary for the
71 debugging mechanism */
72 public OopHandle startAsOopHandle() {
73 return startField.getOopHandle(addr);
74 }
75
76 /** Support for iteration over heap -- not sure how this will
77 interact with GC in reflective system, but necessary for the
78 debugging mechanism */
79 public OopHandle nextOopHandle(OopHandle handle, long size) {
80 return handle.addOffsetToAsOopHandle(size);
81 }
82
83 // public int size(); // FIXME: must adjust this to be in bytes
84 // public int availableSize(); // FIXME: must adjust this to be in bytes
85 public void print() {
86 printOn(System.out);
87 }
88
89 public boolean contains(Address p) {
90 if (top() == null) {
91 return false;
92 }
93 return (start().lessThanOrEqual(p) && top().greaterThan(p));
94 }
95
96 public void printOn(PrintStream tty) {
97 tty.println(" [" + start() + "," +
98 top() + "," + end() + ")");
99 }
100 }