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annotate agent/src/share/classes/sun/jvm/hotspot/oops/java_lang_Class.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
parents e6b1331a51d2
children 8e47bac5643a
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1 /*
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2 * Copyright (c) 2011, 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.oops;
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26
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27 import java.util.*;
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28
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.memory.*;
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31 import sun.jvm.hotspot.runtime.*;
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32 import sun.jvm.hotspot.types.AddressField;
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33 import sun.jvm.hotspot.types.Type;
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34 import sun.jvm.hotspot.types.TypeDataBase;
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35 import sun.jvm.hotspot.utilities.*;
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36 import sun.jvm.hotspot.jdi.JVMTIThreadState;
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37
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38 /** A utility class encapsulating useful oop operations */
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39
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40 // initialize fields for java.lang.Class
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41 public class java_lang_Class {
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42
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43 // java.lang.Class fields
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44 static int klassOffset;
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45 static IntField oopSizeField;
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46
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47 static {
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48 VM.registerVMInitializedObserver(new Observer() {
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49 public void update(Observable o, Object data) {
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50 initialize(VM.getVM().getTypeDataBase());
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51 }
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52 });
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53 }
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54
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55 private static synchronized void initialize(TypeDataBase db) {
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56 // klass and oop_size are HotSpot magic fields and hence we can't
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57 // find them from InstanceKlass for java.lang.Class.
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58 Type jlc = db.lookupType("java_lang_Class");
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59 klassOffset = (int) jlc.getCIntegerField("_klass_offset").getValue();
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60 int oopSizeOffset = (int) jlc.getCIntegerField("_oop_size_offset").getValue();
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61 oopSizeField = new IntField(new NamedFieldIdentifier("oop_size"), oopSizeOffset, true);
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62 }
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63
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64 /** get Klass* field at offset hc_klass_offset from a java.lang.Class object */
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65 public static Klass asKlass(Oop aClass) {
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66 if (VM.getVM().isCompressedHeadersEnabled()) {
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67 throw new InternalError("unimplemented");
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68 } else {
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69 return (Klass)Metadata.instantiateWrapperFor(aClass.getHandle().getAddressAt(klassOffset));
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70 }
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71 }
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72
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73 /** get oop_size field at offset oop_size_offset from a java.lang.Class object */
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74 public static long getOopSize(Oop aClass) {
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75 return java_lang_Class.oopSizeField.getValue(aClass);
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76 }
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77 }