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1 /*
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2 * Copyright 2003 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any 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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