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3972
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1 /*
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2 * Copyright (c) 2011, 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.gc_interface.CollectedHeapName;
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33 import sun.jvm.hotspot.memory.MemRegion;
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34 import sun.jvm.hotspot.memory.SharedHeap;
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35 import sun.jvm.hotspot.memory.SpaceClosure;
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36 import sun.jvm.hotspot.runtime.VM;
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37 import sun.jvm.hotspot.runtime.VMObjectFactory;
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38 import sun.jvm.hotspot.types.CIntegerField;
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39 import sun.jvm.hotspot.types.Type;
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40 import sun.jvm.hotspot.types.TypeDataBase;
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41
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42 // Mirror class for G1CollectedHeap.
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43
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44 public class G1CollectedHeap extends SharedHeap {
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45 // HeapRegionSeq _seq;
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46 static private long hrsFieldOffset;
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47 // MemRegion _g1_committed;
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48 static private long g1CommittedFieldOffset;
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49 // size_t _summary_bytes_used;
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50 static private CIntegerField summaryBytesUsedField;
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51
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52 static {
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53 VM.registerVMInitializedObserver(new Observer() {
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54 public void update(Observable o, Object data) {
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55 initialize(VM.getVM().getTypeDataBase());
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56 }
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57 });
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58 }
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59
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60 static private synchronized void initialize(TypeDataBase db) {
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61 Type type = db.lookupType("G1CollectedHeap");
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62
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63 hrsFieldOffset = type.getField("_hrs").getOffset();
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64 g1CommittedFieldOffset = type.getField("_g1_committed").getOffset();
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65 summaryBytesUsedField = type.getCIntegerField("_summary_bytes_used");
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66 }
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67
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68 public long capacity() {
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69 Address g1CommittedAddr = addr.addOffsetTo(g1CommittedFieldOffset);
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70 MemRegion g1_committed = new MemRegion(g1CommittedAddr);
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71 return g1_committed.byteSize();
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72 }
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73
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74 public long used() {
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75 return summaryBytesUsedField.getValue(addr);
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76 }
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77
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78 public long n_regions() {
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79 return hrs().length();
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80 }
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81
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82 private HeapRegionSeq hrs() {
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83 Address hrsAddr = addr.addOffsetTo(hrsFieldOffset);
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84 return (HeapRegionSeq) VMObjectFactory.newObject(HeapRegionSeq.class,
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85 hrsAddr);
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86 }
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87
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88 private Iterator<HeapRegion> heapRegionIterator() {
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89 return hrs().heapRegionIterator();
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90 }
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91
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92 public void heapRegionIterate(SpaceClosure scl) {
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93 Iterator<HeapRegion> iter = heapRegionIterator();
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94 while (iter.hasNext()) {
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95 HeapRegion hr = iter.next();
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96 scl.doSpace(hr);
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97 }
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98 }
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99
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100 public CollectedHeapName kind() {
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101 return CollectedHeapName.G1_COLLECTED_HEAP;
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102 }
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103
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104 public G1CollectedHeap(Address addr) {
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105 super(addr);
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106 }
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107 }
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