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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.Observable;
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28 import java.util.Observer;
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29
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30 import sun.jvm.hotspot.debugger.Address;
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31 import sun.jvm.hotspot.memory.ContiguousSpace;
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32 import sun.jvm.hotspot.runtime.VM;
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33 import sun.jvm.hotspot.types.CIntegerField;
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34 import sun.jvm.hotspot.types.Type;
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35 import sun.jvm.hotspot.types.TypeDataBase;
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36
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37 // Mirror class for HeapRegion. Currently we don't actually include
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38 // any of its fields but only iterate over it (which we get "for free"
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39 // as HeapRegion ultimately inherits from ContiguousSpace).
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40
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41 public class HeapRegion extends ContiguousSpace {
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42 // static int GrainBytes;
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43 static private CIntegerField grainBytesField;
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44
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45 static {
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46 VM.registerVMInitializedObserver(new Observer() {
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47 public void update(Observable o, Object data) {
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48 initialize(VM.getVM().getTypeDataBase());
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49 }
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50 });
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51 }
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52
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53 static private synchronized void initialize(TypeDataBase db) {
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54 Type type = db.lookupType("HeapRegion");
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55
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56 grainBytesField = type.getCIntegerField("GrainBytes");
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57 }
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58
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59 static public long grainBytes() {
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60 return grainBytesField.getValue();
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61 }
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62
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63 public HeapRegion(Address addr) {
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64 super(addr);
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65 }
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66 }
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