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annotate agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionSeq.java @ 20336:6701abbc4441

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8054818: Refactor HeapRegionSeq to manage heap region and auxiliary data Summary: Let HeapRegionSeq manage the heap region and auxiliary data to decrease the amount of responsibilities of G1CollectedHeap, and encapsulate this work from other code. Reviewed-by: jwilhelm, jmasa, mgerdin, brutisso
author tschatzl
date Tue, 19 Aug 2014 10:50:27 +0200
parents 50287b659eb8
children
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1 /*
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2 * Copyright (c) 2011, 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 HeapRegionSeq. It essentially encapsulates the G1HeapRegionTable.
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41
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42 public class HeapRegionSeq extends VMObject {
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43 // G1HeapRegionTable _regions
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44 static private long regionsFieldOffset;
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45 // uint _committed_length
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46 static private CIntegerField numCommittedField;
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47
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48 static {
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49 VM.registerVMInitializedObserver(new Observer() {
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50 public void update(Observable o, Object data) {
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51 initialize(VM.getVM().getTypeDataBase());
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52 }
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53 });
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54 }
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55
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56 static private synchronized void initialize(TypeDataBase db) {
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57 Type type = db.lookupType("HeapRegionSeq");
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58
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59 regionsFieldOffset = type.getField("_regions").getOffset();
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60 numCommittedField = type.getCIntegerField("_num_committed");
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61 }
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62
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63 private G1HeapRegionTable regions() {
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64 Address regionsAddr = addr.addOffsetTo(regionsFieldOffset);
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65 return (G1HeapRegionTable) VMObjectFactory.newObject(G1HeapRegionTable.class,
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66 regionsAddr);
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67 }
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68
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69 public long capacity() {
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70 return length() * HeapRegion.grainBytes();
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71 }
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72
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73 public long length() {
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74 return regions().length();
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75 }
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76
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77 public long committedLength() {
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78 return numCommittedField.getValue(addr);
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79 }
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80
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81 public Iterator<HeapRegion> heapRegionIterator() {
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82 return regions().heapRegionIterator(length());
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83 }
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84
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85 public HeapRegionSeq(Address addr) {
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86 super(addr);
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87 }
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88 }