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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/PerfMemory.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 2004 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.oops.*;
30 import sun.jvm.hotspot.types.*;
31
32 public class PerfMemory {
33 private static AddressField startField;
34 private static AddressField endField;
35 private static AddressField topField;
36 private static CIntegerField capacityField;
37 private static AddressField prologueField;
38 private static JIntField initializedField;
39
40 static {
41 VM.registerVMInitializedObserver(new Observer() {
42 public void update(Observable o, Object data) {
43 initialize(VM.getVM().getTypeDataBase());
44 }
45 });
46 }
47
48 private static synchronized void initialize(TypeDataBase db) {
49 Type type = db.lookupType("PerfMemory");
50 startField = type.getAddressField("_start");
51 endField = type.getAddressField("_end");
52 topField = type.getAddressField("_top");
53 capacityField = type.getCIntegerField("_capacity");
54 prologueField = type.getAddressField("_prologue");
55 initializedField = type.getJIntField("_initialized");
56 }
57
58 // Accessors
59 public static Address start() {
60 return startField.getValue();
61 }
62
63 public static Address end() {
64 return endField.getValue();
65 }
66
67 public static Address top() {
68 return topField.getValue();
69 }
70
71 public static long capacity() {
72 return capacityField.getValue();
73 }
74
75 public static boolean initialized() {
76 return ((int) initializedField.getValue()) != 0;
77 }
78
79 public static PerfDataPrologue prologue() {
80 return (PerfDataPrologue) VMObjectFactory.newObject(
81 PerfDataPrologue.class, prologueField.getValue());
82 }
83
84 public static boolean contains(Address addr) {
85 return start() != null &&
86 addr.minus(start()) >= 0 &&
87 end().minus(addr) > 0;
88 }
89
90 // an interface supplied to iterate PerfDataEntries
91 public static interface PerfDataEntryVisitor {
92 // returns false to stop the iteration
93 public boolean visit(PerfDataEntry pde);
94 }
95
96 public static void iterate(PerfDataEntryVisitor visitor) {
97 PerfDataPrologue header = prologue();
98 int off = header.entryOffset();
99 int num = header.numEntries();
100 Address addr = header.getAddress();
101
102 for (int i = 0; i < num; i++) {
103 PerfDataEntry pde = (PerfDataEntry) VMObjectFactory.newObject(
104 PerfDataEntry.class, addr.addOffsetTo(off));
105 off += pde.entryLength();
106 if (visitor.visit(pde) == false) return;
107 }
108 }
109 }