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1 /*
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2 * Copyright 2000-2004 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 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.runtime.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 public class CodeHeap extends VMObject {
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33 private static Field memoryField;
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34 private static Field segmapField;
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35 // private static CIntegerField numberOfCommittedSegmentsField;
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36 // private static CIntegerField numberOfReservedSegmentsField;
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37 // private static CIntegerField segmentSizeField;
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38 private static CIntegerField log2SegmentSizeField;
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39 // private static CIntegerField nextSegmentField;
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40 // private static AddressField freelistField;
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41 // private static CIntegerField freeSegmentsField;
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42
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43 private VirtualSpace memory;
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44 private VirtualSpace segmentMap;
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45 private int log2SegmentSize;
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46
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47 static {
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48 VM.registerVMInitializedObserver(new Observer() {
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49 public void update(Observable o, Object data) {
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50 initialize(VM.getVM().getTypeDataBase());
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51 }
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52 });
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53 }
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54
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55 private static void initialize(TypeDataBase db) {
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56 Type type = db.lookupType("CodeHeap");
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57
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58 memoryField = type.getField("_memory");
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59 segmapField = type.getField("_segmap");
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60 log2SegmentSizeField = type.getCIntegerField("_log2_segment_size");
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61
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62 }
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63
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64 public CodeHeap(Address addr) {
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65 super(addr);
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66 log2SegmentSize = (int) log2SegmentSizeField.getValue(addr);
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67 segmentMap = new VirtualSpace(addr.addOffsetTo(segmapField.getOffset()));
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68 memory = new VirtualSpace(addr.addOffsetTo(memoryField.getOffset()));
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69 }
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70
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71 public Address begin() {
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72 return getMemory().low();
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73 }
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74
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75 public Address end() {
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76 return getMemory().high();
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77 }
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78
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79 public boolean contains(Address p) {
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80 return (begin().lessThanOrEqual(p) && end().greaterThan(p));
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81 }
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82
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83 /** Returns the start of the block containing p or null */
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84 public Address findStart(Address p) {
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85 if (!contains(p)) return null;
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86 HeapBlock h = blockStart(p);
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87 if (h == null || h.isFree()) {
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88 return null;
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89 }
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90 return h.getAllocatedSpace();
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91 }
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92
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93 public Address nextBlock(Address ptr) {
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94 Address base = blockBase(ptr);
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95 if (base == null) {
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96 return null;
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97 }
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98 HeapBlock block = getBlockAt(base);
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99 return base.addOffsetTo(block.getLength() * (1 << getLog2SegmentSize()));
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100 }
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101
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102 //--------------------------------------------------------------------------------
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103 // Internals only below this point
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104 //
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105
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106 private VirtualSpace getMemory() {
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107 return memory;
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108 }
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109
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110 private VirtualSpace getSegmentMap() {
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111 return segmentMap;
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112 }
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113
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114 private long segmentFor(Address p) {
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115 return p.minus(getMemory().low()) >> getLog2SegmentSize();
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116 }
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117
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118 private int getLog2SegmentSize() {
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119 return log2SegmentSize;
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120 }
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121
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122 private HeapBlock getBlockAt(Address addr) {
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123 return (HeapBlock) VMObjectFactory.newObject(HeapBlock.class, addr);
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124 }
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125
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126
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127 private HeapBlock blockStart(Address p) {
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128 Address base = blockBase(p);
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129 if (base == null) return null;
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130 return getBlockAt(base);
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131 }
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132
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133 private Address blockBase(Address p) {
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134 long i = segmentFor(p);
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135 Address b = getSegmentMap().low();
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136 if (b.getCIntegerAt(i, 1, true) == 0xFF) {
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137 return null;
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138 }
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139 while (b.getCIntegerAt(i, 1, true) > 0) {
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140 i -= b.getCIntegerAt(i, 1, true);
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141 }
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142 return getMemory().low().addOffsetTo(i << getLog2SegmentSize());
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143 }
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144
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145 }
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