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comparison agent/src/share/classes/sun/jvm/hotspot/memory/MemRegion.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 /*
2 * Copyright 2000-2001 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.memory;
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 /** A very simple data structure representing a contigous region of
35 address space. */
36
37 public class MemRegion implements Cloneable {
38 private Address start;
39 private long byteSize;
40
41 private static AddressField startField;
42 private static CIntegerField wordSizeField;
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("MemRegion");
54
55 startField = type.getAddressField("_start");
56 wordSizeField = type.getCIntegerField("_word_size");
57 }
58
59 public MemRegion() {
60 }
61
62 /** This constructor takes a "MemRegion*" in the target process */
63 public MemRegion(Address memRegionAddr) {
64 this(startField.getValue(memRegionAddr),
65 wordSizeField.getValue(memRegionAddr));
66 }
67
68 public MemRegion(Address start, long wordSize) {
69 setStart(start);
70 setWordSize(wordSize);
71 }
72
73 public MemRegion(Address start, Address limit) {
74 setStart(start);
75 byteSize = limit.minus(start);
76 }
77
78 public Object clone() {
79 return new MemRegion(start, byteSize);
80 }
81
82 public MemRegion copy() {
83 return (MemRegion) clone();
84 }
85
86 public MemRegion intersection(MemRegion mr2) {
87 MemRegion res = new MemRegion();
88 if (AddressOps.gt(mr2.start(), start())) {
89 res.setStart(mr2.start());
90 } else {
91 res.setStart(start());
92 }
93 Address resEnd;
94 Address end = end();
95 Address mr2End = mr2.end();
96 if (AddressOps.lt(end, mr2End)) {
97 resEnd = end;
98 } else {
99 resEnd = mr2End;
100 }
101 if (AddressOps.lt(resEnd, res.start())) {
102 res.setStart(null);
103 res.setWordSize(0);
104 } else {
105 res.setEnd(resEnd);
106 }
107 return res;
108 }
109
110 public MemRegion union(MemRegion mr2) {
111 MemRegion res = new MemRegion();
112 if (AddressOps.lt(mr2.start(), start())) {
113 res.setStart(mr2.start());
114 } else {
115 res.setStart(start());
116 }
117 Address resEnd;
118 Address end = end();
119 Address mr2End = mr2.end();
120 if (AddressOps.gt(end, mr2End)) {
121 resEnd = end;
122 } else {
123 resEnd = mr2End;
124 }
125 res.setEnd(resEnd);
126 return res;
127 }
128
129 public Address start() {
130 return start;
131 }
132
133 public OopHandle startAsOopHandle() {
134 return start().addOffsetToAsOopHandle(0);
135 }
136
137 public Address end() {
138 return start.addOffsetTo(byteSize);
139 }
140
141 public OopHandle endAsOopHandle() {
142 return end().addOffsetToAsOopHandle(0);
143 }
144
145 public void setStart(Address start) {
146 this.start = start;
147 }
148
149 public void setEnd(Address end) {
150 byteSize = end.minus(start);
151 }
152
153 public void setWordSize(long wordSize) {
154 byteSize = VM.getVM().getAddressSize() * wordSize;
155 }
156
157 public boolean contains(MemRegion mr2) {
158 return AddressOps.lte(start, mr2.start) && AddressOps.gte(end(), mr2.end());
159 }
160
161 public boolean contains(Address addr) {
162 return AddressOps.gte(addr, start()) && AddressOps.lt(addr, end());
163 }
164
165 public long byteSize() {
166 return byteSize;
167 }
168
169 public long wordSize() {
170 return byteSize / VM.getVM().getAddressSize();
171 }
172 }