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annotate agent/src/share/classes/sun/jvm/hotspot/gc_implementation/g1/HeapRegionSeq.java @ 12904:9e5fadad7fdf

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8025925: jmap fails with "field _length not found in type HeapRegionSeq" Summary: The change JDK-7163191 changed the data layout of a class that is referenced by the java code of the SA agent. This fix synchronizes the SA agent with that change. Reviewed-by: sla, mgerdin
author tschatzl
date Wed, 16 Oct 2013 11:46:06 +0200
parents 720b6a76dd9d
children 50287b659eb8
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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
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46 static {
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47 VM.registerVMInitializedObserver(new Observer() {
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48 public void update(Observable o, Object data) {
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49 initialize(VM.getVM().getTypeDataBase());
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50 }
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51 });
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52 }
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53
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54 static private synchronized void initialize(TypeDataBase db) {
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55 Type type = db.lookupType("HeapRegionSeq");
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56
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57 regionsFieldOffset = type.getField("_regions").getOffset();
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58 }
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59
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60 private G1HeapRegionTable regions() {
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61 Address regionsAddr = addr.addOffsetTo(regionsFieldOffset);
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62 return (G1HeapRegionTable) VMObjectFactory.newObject(G1HeapRegionTable.class,
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63 regionsAddr);
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64 }
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65
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66 public long length() {
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67 return regions().length();
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68 }
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69
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70 public Iterator<HeapRegion> heapRegionIterator() {
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71 return regions().heapRegionIterator();
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72 }
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73
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74 public HeapRegionSeq(Address addr) {
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75 super(addr);
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76 }
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77 }