1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #include "precompiled.hpp" 26 #include "prims/jvm.h" 27 #include "runtime/os.hpp" 28 #include "utilities/decoder.hpp" 29 #include "utilities/vmError.hpp" 30 31 #if defined(_WINDOWS) 32 #include "decoder_windows.hpp" 33 #elif defined(__APPLE__) 34 #include "decoder_machO.hpp" 35 #elif defined(AIX) 36 #include "decoder_aix.hpp" 37 #else 38 #include "decoder_elf.hpp" 39 #endif 40 41 AbstractDecoder* Decoder::_shared_decoder = NULL; 42 AbstractDecoder* Decoder::_error_handler_decoder = NULL; 43 NullDecoder Decoder::_do_nothing_decoder; 44 Mutex* Decoder::_shared_decoder_lock = new Mutex(Mutex::native, 45 "SharedDecoderLock"); 46 47 AbstractDecoder* Decoder::get_shared_instance() { 48 assert(_shared_decoder_lock != NULL && _shared_decoder_lock->owned_by_self(), 49 "Require DecoderLock to enter"); 50 51 if (_shared_decoder == NULL) { 52 _shared_decoder = create_decoder(); 53 } 54 return _shared_decoder; 55 } 56 57 AbstractDecoder* Decoder::get_error_handler_instance() { 58 if (_error_handler_decoder == NULL) { 59 _error_handler_decoder = create_decoder(); 60 } 61 return _error_handler_decoder; 62 } 63 64 65 AbstractDecoder* Decoder::create_decoder() { 66 AbstractDecoder* decoder; 67 #if defined(_WINDOWS) 68 decoder = new (std::nothrow) WindowsDecoder(); 69 #elif defined (__APPLE__) 70 decoder = new (std::nothrow)MachODecoder(); 71 #elif defined(AIX) 72 decoder = new (std::nothrow)AIXDecoder(); 73 #else 74 decoder = new (std::nothrow)ElfDecoder(); 75 #endif 76 77 if (decoder == NULL || decoder->has_error()) { 78 if (decoder != NULL) { 79 delete decoder; 80 } 81 decoder = &_do_nothing_decoder; 82 } 83 return decoder; 84 } 85 86 inline bool DecoderLocker::is_first_error_thread() { 87 return (os::current_thread_id() == VMError::get_first_error_tid()); 88 } 89 90 DecoderLocker::DecoderLocker() : 91 MutexLockerEx(DecoderLocker::is_first_error_thread() ? 92 NULL : Decoder::shared_decoder_lock(), true) { 93 _decoder = is_first_error_thread() ? 94 Decoder::get_error_handler_instance() : Decoder::get_shared_instance(); 95 assert(_decoder != NULL, "null decoder"); 96 } 97 98 Mutex* Decoder::shared_decoder_lock() { 99 assert(_shared_decoder_lock != NULL, "Just check"); 100 return _shared_decoder_lock; 101 } 102 103 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const char* modulepath) { 104 assert(_shared_decoder_lock != NULL, "Just check"); 105 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid; 106 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true); 107 AbstractDecoder* decoder = error_handling_thread ? 108 get_error_handler_instance(): get_shared_instance(); 109 assert(decoder != NULL, "null decoder"); 110 111 return decoder->decode(addr, buf, buflen, offset, modulepath); 112 } 113 114 bool Decoder::decode(address addr, char* buf, int buflen, int* offset, const void* base) { 115 assert(_shared_decoder_lock != NULL, "Just check"); 116 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid; 117 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true); 118 AbstractDecoder* decoder = error_handling_thread ? 119 get_error_handler_instance(): get_shared_instance(); 120 assert(decoder != NULL, "null decoder"); 121 122 return decoder->decode(addr, buf, buflen, offset, base); 123 } 124 125 126 bool Decoder::demangle(const char* symbol, char* buf, int buflen) { 127 assert(_shared_decoder_lock != NULL, "Just check"); 128 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid; 129 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true); 130 AbstractDecoder* decoder = error_handling_thread ? 131 get_error_handler_instance(): get_shared_instance(); 132 assert(decoder != NULL, "null decoder"); 133 return decoder->demangle(symbol, buf, buflen); 134 } 135 136 bool Decoder::can_decode_C_frame_in_vm() { 137 assert(_shared_decoder_lock != NULL, "Just check"); 138 bool error_handling_thread = os::current_thread_id() == VMError::first_error_tid; 139 MutexLockerEx locker(error_handling_thread ? NULL : _shared_decoder_lock, true); 140 AbstractDecoder* decoder = error_handling_thread ? 141 get_error_handler_instance(): get_shared_instance(); 142 assert(decoder != NULL, "null decoder"); 143 return decoder->can_decode_C_frame_in_vm(); 144 } 145 146 /* 147 * Shutdown shared decoder and replace it with 148 * _do_nothing_decoder. Do nothing with error handler 149 * instance, since the JVM is going down. 150 */ 151 void Decoder::shutdown() { 152 assert(_shared_decoder_lock != NULL, "Just check"); 153 MutexLockerEx locker(_shared_decoder_lock, true); 154 155 if (_shared_decoder != NULL && 156 _shared_decoder != &_do_nothing_decoder) { 157 delete _shared_decoder; 158 } 159 160 _shared_decoder = &_do_nothing_decoder; 161 } 162