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annotate agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/G1HeapRegionTable.java @ 17736:58fc1b1523dc

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8034079: G1: Refactor the HeapRegionSet hierarchy Reviewed-by: tschatzl, pliden
author brutisso
date Fri, 14 Mar 2014 10:15:46 +0100
parents 50287b659eb8
children 6701abbc4441
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1 /*
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2 * Copyright (c) 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * 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.gc_implementation.g1;
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26
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27 import java.util.Iterator;
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28 import java.util.Observable;
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29 import java.util.Observer;
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30
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31 import sun.jvm.hotspot.debugger.Address;
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32 import sun.jvm.hotspot.runtime.VM;
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33 import sun.jvm.hotspot.runtime.VMObject;
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34 import sun.jvm.hotspot.runtime.VMObjectFactory;
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35 import sun.jvm.hotspot.types.AddressField;
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36 import sun.jvm.hotspot.types.CIntegerField;
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37 import sun.jvm.hotspot.types.Type;
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38 import sun.jvm.hotspot.types.TypeDataBase;
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39
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40 // Mirror class for G1HeapRegionTable. It's essentially an index -> HeapRegion map.
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41
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42 public class G1HeapRegionTable extends VMObject {
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43 // HeapRegion** _base;
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44 static private AddressField baseField;
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45 // uint _length;
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46 static private CIntegerField lengthField;
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47 // HeapRegion** _biased_base
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48 static private AddressField biasedBaseField;
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49 // size_t _bias
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50 static private CIntegerField biasField;
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51 // uint _shift_by
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52 static private CIntegerField shiftByField;
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53
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54 static {
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55 VM.registerVMInitializedObserver(new Observer() {
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56 public void update(Observable o, Object data) {
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57 initialize(VM.getVM().getTypeDataBase());
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58 }
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59 });
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60 }
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61
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62 static private synchronized void initialize(TypeDataBase db) {
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63 Type type = db.lookupType("G1HeapRegionTable");
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64
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65 baseField = type.getAddressField("_base");
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66 lengthField = type.getCIntegerField("_length");
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67 biasedBaseField = type.getAddressField("_biased_base");
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68 biasField = type.getCIntegerField("_bias");
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69 shiftByField = type.getCIntegerField("_shift_by");
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70 }
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71
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72 private HeapRegion at(long index) {
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73 Address arrayAddr = baseField.getValue(addr);
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74 // Offset of &_base[index]
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75 long offset = index * VM.getVM().getAddressSize();
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76 Address regionAddr = arrayAddr.getAddressAt(offset);
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77 return (HeapRegion) VMObjectFactory.newObject(HeapRegion.class,
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78 regionAddr);
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79 }
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80
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81 public long length() {
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82 return lengthField.getValue(addr);
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83 }
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84
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85 public long bias() {
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86 return biasField.getValue(addr);
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87 }
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88
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89 public long shiftBy() {
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90 return shiftByField.getValue(addr);
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91 }
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92
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93 private class HeapRegionIterator implements Iterator<HeapRegion> {
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94 private long index;
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95 private long length;
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96
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97 @Override
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98 public boolean hasNext() { return index < length; }
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99
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100 @Override
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101 public HeapRegion next() { return at(index++); }
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102
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103 @Override
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104 public void remove() { /* not supported */ }
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105
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106 HeapRegionIterator(long committedLength) {
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107 index = 0;
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108 length = committedLength;
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109 }
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110 }
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111
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112 public Iterator<HeapRegion> heapRegionIterator(long committedLength) {
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113 return new HeapRegionIterator(committedLength);
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114 }
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115
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116 public G1HeapRegionTable(Address addr) {
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117 super(addr);
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118 }
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119 }