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1 /*
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2 * Copyright 2000-2001 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 package sun.jvm.hotspot.memory;
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26
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27 import java.util.*;
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28
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32 import sun.jvm.hotspot.utilities.*;
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33
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34 /** A very simple data structure representing a contigous region of
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35 address space. */
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36
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37 public class MemRegion implements Cloneable {
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38 private Address start;
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39 private long byteSize;
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40
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41 private static AddressField startField;
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42 private static CIntegerField wordSizeField;
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43
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44 static {
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45 VM.registerVMInitializedObserver(new Observer() {
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46 public void update(Observable o, Object data) {
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47 initialize(VM.getVM().getTypeDataBase());
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48 }
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49 });
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50 }
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51
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52 private static synchronized void initialize(TypeDataBase db) {
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53 Type type = db.lookupType("MemRegion");
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54
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55 startField = type.getAddressField("_start");
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56 wordSizeField = type.getCIntegerField("_word_size");
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57 }
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58
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59 public MemRegion() {
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60 }
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61
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62 /** This constructor takes a "MemRegion*" in the target process */
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63 public MemRegion(Address memRegionAddr) {
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64 this(startField.getValue(memRegionAddr),
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65 wordSizeField.getValue(memRegionAddr));
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66 }
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67
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68 public MemRegion(Address start, long wordSize) {
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69 setStart(start);
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70 setWordSize(wordSize);
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71 }
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72
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73 public MemRegion(Address start, Address limit) {
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74 setStart(start);
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75 byteSize = limit.minus(start);
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76 }
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77
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78 public Object clone() {
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79 return new MemRegion(start, byteSize);
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80 }
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81
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82 public MemRegion copy() {
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83 return (MemRegion) clone();
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84 }
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85
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86 public MemRegion intersection(MemRegion mr2) {
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87 MemRegion res = new MemRegion();
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88 if (AddressOps.gt(mr2.start(), start())) {
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89 res.setStart(mr2.start());
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90 } else {
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91 res.setStart(start());
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92 }
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93 Address resEnd;
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94 Address end = end();
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95 Address mr2End = mr2.end();
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96 if (AddressOps.lt(end, mr2End)) {
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97 resEnd = end;
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98 } else {
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99 resEnd = mr2End;
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100 }
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101 if (AddressOps.lt(resEnd, res.start())) {
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102 res.setStart(null);
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103 res.setWordSize(0);
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104 } else {
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105 res.setEnd(resEnd);
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106 }
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107 return res;
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108 }
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109
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110 public MemRegion union(MemRegion mr2) {
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111 MemRegion res = new MemRegion();
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112 if (AddressOps.lt(mr2.start(), start())) {
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113 res.setStart(mr2.start());
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114 } else {
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115 res.setStart(start());
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116 }
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117 Address resEnd;
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118 Address end = end();
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119 Address mr2End = mr2.end();
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120 if (AddressOps.gt(end, mr2End)) {
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121 resEnd = end;
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122 } else {
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123 resEnd = mr2End;
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124 }
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125 res.setEnd(resEnd);
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126 return res;
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127 }
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128
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129 public Address start() {
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130 return start;
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131 }
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132
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133 public OopHandle startAsOopHandle() {
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134 return start().addOffsetToAsOopHandle(0);
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135 }
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136
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137 public Address end() {
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138 return start.addOffsetTo(byteSize);
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139 }
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140
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141 public OopHandle endAsOopHandle() {
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142 return end().addOffsetToAsOopHandle(0);
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143 }
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144
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145 public void setStart(Address start) {
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146 this.start = start;
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147 }
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148
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149 public void setEnd(Address end) {
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150 byteSize = end.minus(start);
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151 }
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152
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153 public void setWordSize(long wordSize) {
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154 byteSize = VM.getVM().getAddressSize() * wordSize;
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155 }
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156
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157 public boolean contains(MemRegion mr2) {
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158 return AddressOps.lte(start, mr2.start) && AddressOps.gte(end(), mr2.end());
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159 }
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160
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161 public boolean contains(Address addr) {
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162 return AddressOps.gte(addr, start()) && AddressOps.lt(addr, end());
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163 }
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164
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165 public long byteSize() {
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166 return byteSize;
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167 }
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168
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169 public long wordSize() {
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170 return byteSize / VM.getVM().getAddressSize();
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171 }
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172 }
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