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annotate src/share/vm/utilities/decoder.cpp @ 4803:d7e3846464d0

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7071311: Decoder enhancement Summary: Made decoder thread-safe Reviewed-by: coleenp, kamg
author zgu
date Tue, 17 Jan 2012 13:08:52 -0500
parents f08d439fab8c
children db006a85bf91
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1 /*
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2 * Copyright (c) 1997, 2010, 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
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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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 #include "precompiled.hpp"
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26 #include "prims/jvm.h"
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27 #include "runtime/mutexLocker.hpp"
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28 #include "utilities/decoder.hpp"
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29
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30 #if defined(_WINDOWS)
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31 #include "decoder_windows.hpp"
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32 #elif defined(__APPLE__)
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33 #include "decoder_machO.hpp"
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34 #else
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35 #include "decoder_elf.hpp"
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36 #endif
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37
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38 NullDecoder* Decoder::_decoder = NULL;
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39 NullDecoder Decoder::_do_nothing_decoder;
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40 Mutex* Decoder::_decoder_lock = new Mutex(Mutex::safepoint,
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41 "DecoderLock");
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42
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43 // _decoder_lock should already acquired before enter this method
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44 NullDecoder* Decoder::get_decoder() {
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45 assert(_decoder_lock != NULL && _decoder_lock->owned_by_self(),
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46 "Require DecoderLock to enter");
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47
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48 if (_decoder != NULL) {
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49 return _decoder;
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50 }
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51
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52 // Decoder is a secondary service. Although, it is good to have,
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53 // but we can live without it.
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54 #if defined(_WINDOWS)
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55 _decoder = new (std::nothrow) WindowsDecoder();
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56 #elif defined (__APPLE__)
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57 _decoder = new (std::nothrow)MachODecoder();
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58 #else
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59 _decoder = new (std::nothrow)ElfDecoder();
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60 #endif
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61
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62 if (_decoder == NULL || _decoder->has_error()) {
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63 if (_decoder != NULL) {
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64 delete _decoder;
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65 }
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66 _decoder = &_do_nothing_decoder;
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67 }
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68 return _decoder;
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69 }
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70
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71 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) {
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72 assert(_decoder_lock != NULL, "Just check");
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73 MutexLockerEx locker(_decoder_lock, true);
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74 NullDecoder* decoder = get_decoder();
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75 assert(decoder != NULL, "null decoder");
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76
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77 return decoder->decode(addr, buf, buflen, offset, modulepath);
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78 }
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79
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80 bool Decoder::demangle(const char* symbol, char* buf, int buflen) {
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81 assert(_decoder_lock != NULL, "Just check");
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82 MutexLockerEx locker(_decoder_lock, true);
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83 NullDecoder* decoder = get_decoder();
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84 assert(decoder != NULL, "null decoder");
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85 return decoder->demangle(symbol, buf, buflen);
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86 }
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87
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88 bool Decoder::can_decode_C_frame_in_vm() {
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89 assert(_decoder_lock != NULL, "Just check");
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90 MutexLockerEx locker(_decoder_lock, true);
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91 NullDecoder* decoder = get_decoder();
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92 assert(decoder != NULL, "null decoder");
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93 return decoder->can_decode_C_frame_in_vm();
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94 }
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95
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96 // shutdown real decoder and replace it with
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97 // _do_nothing_decoder
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98 void Decoder::shutdown() {
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99 assert(_decoder_lock != NULL, "Just check");
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100 MutexLockerEx locker(_decoder_lock, true);
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101
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102 if (_decoder != NULL && _decoder != &_do_nothing_decoder) {
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103 delete _decoder;
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104 }
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105
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106 _decoder = &_do_nothing_decoder;
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107 }
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108