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comparison agent/src/share/classes/sun/jvm/hotspot/bugspot/PCFinder.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2001 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.bugspot;
26
27 import sun.jvm.hotspot.debugger.*;
28 import sun.jvm.hotspot.debugger.cdbg.*;
29
30 /** Helper class for locating a program counter. Indicates the
31 confidence of the find. */
32
33 public class PCFinder {
34 public static final int LOW_CONFIDENCE = 1;
35 public static final int HIGH_CONFIDENCE = 2;
36
37 public static class Info {
38 private String name;
39 private long offset;
40 private int confidence;
41
42 public Info(String name, long offset, int confidence) {
43 this.name = name;
44 this.offset = offset;
45 this.confidence = confidence;
46 }
47
48 /** May be null */
49 public String getName() { return name; }
50
51 /** If this is -1, a symbol could not be found, and the offset
52 should not be shown */
53 public long getOffset() { return offset; }
54
55 /** PCFinder.LOW_CONFIDENCE or PCFinder.HIGH_CONFIDENCE */
56 public int getConfidence() { return confidence; }
57 }
58
59 /** Passed loadobject may be null in which case the returned Info
60 object has low confidence */
61 public static Info findPC(Address pc, LoadObject lo, CDebugger dbg) {
62 if (lo == null) {
63 return new Info(null, -1, LOW_CONFIDENCE);
64 }
65
66 // First try debug info
67 BlockSym sym = lo.debugInfoForPC(pc);
68 while (sym != null) {
69 if (sym.isFunction()) {
70 // Highest confidence
71 return new Info(sym.toString(), pc.minus(sym.getAddress()), HIGH_CONFIDENCE);
72 }
73 }
74
75 // Now try looking up symbol in loadobject
76
77 // FIXME: must add support for mapfiles on Win32 and try looking
78 // up there first if possible. Should we hide that behind
79 // LoadObject.closestSymbolToPC and have the ClosestSymbol return
80 // confidence? I think so. On Solaris there is no notion of a
81 // mapfile, and the confidence for closestSymbolToPC will be high
82 // instead of low.
83
84 int confidence = HIGH_CONFIDENCE;
85
86 ClosestSymbol cs = lo.closestSymbolToPC(pc);
87 if (cs != null) {
88 // FIXME: currently low confidence (only on Win32)
89 return new Info(cs.getName() + "()", cs.getOffset(), LOW_CONFIDENCE);
90 }
91
92 // Unknown location
93 return new Info(dbg.getNameOfFile(lo.getName()).toUpperCase() +
94 "! " + pc + "()", -1, HIGH_CONFIDENCE);
95 }
96 }