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annotate agent/src/share/classes/sun/jvm/hotspot/code/DebugInfoReadStream.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) 2000, 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.code;
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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.runtime.VM;
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31 import sun.jvm.hotspot.utilities.*;
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32 import sun.jvm.hotspot.oops.Method;
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33
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34 public class DebugInfoReadStream extends CompressedReadStream {
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35 private NMethod code;
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36 private int InvocationEntryBCI;
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37 private List objectPool; // ArrayList<ObjectValue>
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39 public DebugInfoReadStream(NMethod code, int offset) {
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40 super(code.scopesDataBegin(), offset);
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41 InvocationEntryBCI = VM.getVM().getInvocationEntryBCI();
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42 this.code = code;
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43 this.objectPool = null;
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44 }
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45
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46 public DebugInfoReadStream(NMethod code, int offset, List objectPool) {
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47 super(code.scopesDataBegin(), offset);
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48 InvocationEntryBCI = VM.getVM().getInvocationEntryBCI();
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49 this.code = code;
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50 this.objectPool = objectPool;
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51 }
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52
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53 public OopHandle readOopHandle() {
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54 return code.getOopAt(readInt());
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55 }
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56
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57 public Method readMethod() {
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58 return code.getMethodAt(readInt());
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59 }
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60
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61 ScopeValue readObjectValue() {
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62 int id = readInt();
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63 if (Assert.ASSERTS_ENABLED) {
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64 Assert.that(objectPool != null, "object pool does not exist");
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65 for (Iterator itr = objectPool.iterator(); itr.hasNext();) {
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66 ObjectValue ov = (ObjectValue) itr.next();
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67 Assert.that(ov.id() != id, "should not be read twice");
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68 }
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69 }
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70 ObjectValue result = new ObjectValue(id);
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71 // Cache the object since an object field could reference it.
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72 objectPool.add(result);
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73 result.readObject(this);
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74 return result;
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75 }
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77 ScopeValue getCachedObject() {
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78 int id = readInt();
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79 Assert.that(objectPool != null, "object pool does not exist");
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80 for (Iterator itr = objectPool.iterator(); itr.hasNext();) {
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81 ObjectValue ov = (ObjectValue) itr.next();
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82 if (ov.id() == id) {
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83 return ov;
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84 }
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85 }
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86 Assert.that(false, "should not reach here");
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87 return null;
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88 }
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90 public int readBCI() {
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91 return readInt() + InvocationEntryBCI;
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92 }
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93 }