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1 /*
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2 * Copyright 2001 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.bugspot;
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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.cdbg.*;
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29
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30 /** Helper class for locating a program counter. Indicates the
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31 confidence of the find. */
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32
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33 public class PCFinder {
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34 public static final int LOW_CONFIDENCE = 1;
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35 public static final int HIGH_CONFIDENCE = 2;
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36
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37 public static class Info {
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38 private String name;
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39 private long offset;
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40 private int confidence;
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41
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42 public Info(String name, long offset, int confidence) {
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43 this.name = name;
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44 this.offset = offset;
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45 this.confidence = confidence;
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46 }
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47
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48 /** May be null */
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49 public String getName() { return name; }
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50
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51 /** If this is -1, a symbol could not be found, and the offset
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52 should not be shown */
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53 public long getOffset() { return offset; }
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54
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55 /** PCFinder.LOW_CONFIDENCE or PCFinder.HIGH_CONFIDENCE */
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56 public int getConfidence() { return confidence; }
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57 }
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58
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59 /** Passed loadobject may be null in which case the returned Info
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60 object has low confidence */
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61 public static Info findPC(Address pc, LoadObject lo, CDebugger dbg) {
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62 if (lo == null) {
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63 return new Info(null, -1, LOW_CONFIDENCE);
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64 }
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65
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66 // First try debug info
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67 BlockSym sym = lo.debugInfoForPC(pc);
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68 while (sym != null) {
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69 if (sym.isFunction()) {
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70 // Highest confidence
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71 return new Info(sym.toString(), pc.minus(sym.getAddress()), HIGH_CONFIDENCE);
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72 }
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73 }
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74
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75 // Now try looking up symbol in loadobject
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76
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77 // FIXME: must add support for mapfiles on Win32 and try looking
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78 // up there first if possible. Should we hide that behind
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79 // LoadObject.closestSymbolToPC and have the ClosestSymbol return
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80 // confidence? I think so. On Solaris there is no notion of a
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81 // mapfile, and the confidence for closestSymbolToPC will be high
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82 // instead of low.
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83
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84 int confidence = HIGH_CONFIDENCE;
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85
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86 ClosestSymbol cs = lo.closestSymbolToPC(pc);
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87 if (cs != null) {
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88 // FIXME: currently low confidence (only on Win32)
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89 return new Info(cs.getName() + "()", cs.getOffset(), LOW_CONFIDENCE);
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90 }
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91
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92 // Unknown location
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93 return new Info(dbg.getNameOfFile(lo.getName()).toUpperCase() +
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94 "! " + pc + "()", -1, HIGH_CONFIDENCE);
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95 }
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96 }
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