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annotate agent/src/share/classes/sun/jvm/hotspot/code/PCDesc.java @ 1644:2a47bd84841f

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6965184: possible races in make_not_entrant_or_zombie Reviewed-by: kvn
author never
date Thu, 08 Jul 2010 14:29:44 -0700
parents c18cbe5936b8
children 3e8fbc61cee8
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1 /*
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2 * Copyright (c) 2000, 2009, 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.io.*;
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28 import java.util.*;
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29 import sun.jvm.hotspot.debugger.*;
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30 import sun.jvm.hotspot.runtime.*;
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31 import sun.jvm.hotspot.types.*;
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32
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33 /** PcDescs map a physical PC (given as offset from start of nmethod)
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34 to the corresponding source scope and byte code index. */
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35
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36 public class PCDesc extends VMObject {
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37 private static CIntegerField pcOffsetField;
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38 private static CIntegerField scopeDecodeOffsetField;
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39 private static CIntegerField objDecodeOffsetField;
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40 private static CIntegerField pcFlagsField;
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41
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42 static {
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43 VM.registerVMInitializedObserver(new Observer() {
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44 public void update(Observable o, Object data) {
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45 initialize(VM.getVM().getTypeDataBase());
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46 }
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47 });
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48 }
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49
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50 private static void initialize(TypeDataBase db) {
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51 Type type = db.lookupType("PcDesc");
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52
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53 pcOffsetField = type.getCIntegerField("_pc_offset");
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54 scopeDecodeOffsetField = type.getCIntegerField("_scope_decode_offset");
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55 objDecodeOffsetField = type.getCIntegerField("_obj_decode_offset");
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56 pcFlagsField = type.getCIntegerField("_flags");
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57 }
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58
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59 public PCDesc(Address addr) {
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60 super(addr);
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61 }
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62
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63 // FIXME: add additional constructor probably needed for ScopeDesc::sender()
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64
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65 public int getPCOffset() {
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66 return (int) pcOffsetField.getValue(addr);
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67 }
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68
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69 public int getScopeDecodeOffset() {
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70 return ((int) scopeDecodeOffsetField.getValue(addr));
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71 }
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72
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73 public int getObjDecodeOffset() {
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74 return ((int) objDecodeOffsetField.getValue(addr));
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75 }
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76
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77 public Address getRealPC(NMethod code) {
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78 return code.instructionsBegin().addOffsetTo(getPCOffset());
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79 }
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80
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81
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82 public boolean getReexecute() {
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83 int flags = (int)pcFlagsField.getValue(addr);
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84 return ((flags & 0x1)== 1); //first is the reexecute bit
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85 }
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86
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87 public void print(NMethod code) {
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88 printOn(System.out, code);
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89 }
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91 public void printOn(PrintStream tty, NMethod code) {
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92 tty.println("PCDesc(" + getRealPC(code) + "):");
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93 for (ScopeDesc sd = code.getScopeDescAt(getRealPC(code));
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94 sd != null;
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95 sd = sd.sender()) {
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96 tty.print(" ");
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97 sd.getMethod().printValueOn(tty);
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98 tty.print(" @" + sd.getBCI());
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99 tty.print(" reexecute=" + sd.getReexecute());
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100 tty.println();
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101 }
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102 }
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103 }