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annotate agent/src/share/classes/sun/jvm/hotspot/code/RicochetBlob.java @ 3908:7588156f5cf9

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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244) Reviewed-by: kvn
author never
date Mon, 05 Sep 2011 17:09:05 -0700
parents a80577f854f9
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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.code;
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26
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27 import java.util.*;
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28 import sun.jvm.hotspot.debugger.*;
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29 import sun.jvm.hotspot.runtime.*;
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30 import sun.jvm.hotspot.types.*;
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31
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32 /** RicochetBlob (currently only used by Compiler 2) */
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33
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34 public class RicochetBlob extends SingletonBlob {
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35 static {
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36 VM.registerVMInitializedObserver(new Observer() {
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37 public void update(Observable o, Object data) {
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38 initialize(VM.getVM().getTypeDataBase());
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39 }
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40 });
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41 }
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42
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43 private static void initialize(TypeDataBase db) {
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44 Type type = db.lookupType("RicochetBlob");
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45
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46 bounceOffsetField = type.getCIntegerField("_bounce_offset");
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47 exceptionOffsetField = type.getCIntegerField("_exception_offset");
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48 }
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49
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50 private static CIntegerField bounceOffsetField;
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51 private static CIntegerField exceptionOffsetField;
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52
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53 public RicochetBlob(Address addr) {
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54 super(addr);
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55 }
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56
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57 public boolean isRicochetBlob() {
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58 return true;
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59 }
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60
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61 public Address bounceAddr() {
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62 return codeBegin().addOffsetTo(bounceOffsetField.getValue(addr));
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63 }
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64
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65 public boolean returnsToBounceAddr(Address pc) {
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66 Address bouncePc = bounceAddr();
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67 return (pc.equals(bouncePc) || pc.addOffsetTo(Frame.pcReturnOffset()).equals(bouncePc));
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68 }
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69
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70 }