Mercurial > hg > graal-compiler
comparison agent/src/share/classes/sun/jvm/hotspot/bugspot/PCFinder.java @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | c18cbe5936b8 |
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-1:000000000000 | 0:a61af66fc99e |
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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 } |