1 /* |
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2 * Copyright (c) 2003, 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.runtime.ia64; |
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26 |
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27 import sun.jvm.hotspot.debugger.*; |
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28 import sun.jvm.hotspot.debugger.ia64.*; |
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29 import sun.jvm.hotspot.code.*; |
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30 import sun.jvm.hotspot.interpreter.*; |
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31 import sun.jvm.hotspot.runtime.*; |
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32 |
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33 /** <P> Should be able to be used on all ia64 platforms we support |
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34 (Win32, Linux) to implement JavaThread's |
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35 "currentFrameGuess()" functionality. Input is an IA64ThreadContext; |
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36 output is SP, FP, and PC for an IA64Frame. Instantiation of the |
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37 IA64Frame is left to the caller, since we may need to subclass |
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38 IA64Frame to support signal handler frames on Unix platforms. </P> |
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39 |
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40 <P> This is pretty much impossible on ia64. |
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41 </P> */ |
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42 |
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43 public class IA64CurrentFrameGuess { |
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44 private IA64ThreadContext context; |
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45 private JavaThread thread; |
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46 private Address spFound; |
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47 private Address fpFound; |
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48 private Address pcFound; |
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49 |
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50 private static final boolean DEBUG = false; |
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51 |
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52 public IA64CurrentFrameGuess(IA64ThreadContext context, |
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53 JavaThread thread) { |
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54 this.context = context; |
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55 this.thread = thread; |
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56 } |
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57 |
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58 /** Returns false if not able to find a frame within a reasonable range. */ |
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59 public boolean run(long regionInBytesToSearch) { |
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60 /* |
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61 Without using the stack walking library this is not possible on ia64. |
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62 There is also the issue of walking dynamic code where there is no |
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63 stack walking info generated. |
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64 */ |
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65 return false; |
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66 } |
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67 |
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68 public Address getSP() { return null; } |
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69 public Address getFP() { return null; } |
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70 /** May be null if getting values from thread-local storage; take |
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71 care to call the correct IA64Frame constructor to recover this if |
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72 necessary */ |
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73 public Address getPC() { return null; } |
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74 |
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75 private void setValues(Address sp, Address fp, Address pc) { |
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76 spFound = sp; |
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77 fpFound = fp; |
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78 pcFound = pc; |
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79 } |
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80 } |
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