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annotate agent/src/share/classes/sun/jvm/hotspot/utilities/U2Array.java @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
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1 /*
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2 * Copyright (c) 2012, 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.utilities;
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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.runtime.VM;
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32 import sun.jvm.hotspot.types.Type;
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33 import sun.jvm.hotspot.types.TypeDataBase;
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34 import sun.jvm.hotspot.types.WrongTypeException;
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35
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36 public class U2Array extends GenericArray {
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37 static {
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38 VM.registerVMInitializedObserver(new Observer() {
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39 public void update(Observable o, Object data) {
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40 initialize(VM.getVM().getTypeDataBase());
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41 }
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42 });
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43 }
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44
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45 private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
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46 elemType = db.lookupType("u2");
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47 Type type = db.lookupType("Array<u2>");
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48 dataFieldOffset = type.getAddressField("_data").getOffset();
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49 }
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50
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51 private static long dataFieldOffset;
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52 protected static Type elemType;
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53
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54 public U2Array(Address addr) {
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55 super(addr, dataFieldOffset);
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56 }
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57
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58 public short at(int i) {
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59 return (short)getIntegerAt(i);
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60 }
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61
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62 public Type getElemType() {
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63 return elemType;
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64 }
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65 }