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comparison: src/share/vm/utilities/decoder.hpp
src/share/vm/utilities/decoder.hpp
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| 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 | |
| 26 #ifndef SHARE_VM_UTILITIES_DECODER_HPP | |
| 27 #define SHARE_VM_UTILITIES_DECODER_HPP | |
| 28 | |
| 29 #include "memory/allocation.hpp" | |
| 30 #include "runtime/mutex.hpp" | |
| 31 #include "runtime/mutexLocker.hpp" | |
| 32 | |
| 33 class AbstractDecoder : public CHeapObj<mtInternal> { | |
| 34 public: | |
| 35 // status code for decoding native C frame | |
| 36 enum decoder_status { | |
| 37 not_available = -10, // real decoder is not available | |
| 38 no_error = 0, // successfully decoded frames | |
| 39 out_of_memory, // out of memory | |
| 40 file_invalid, // invalid elf file | |
| 41 file_not_found, // could not found symbol file (on windows), such as jvm.pdb or jvm.map | |
| 42 helper_not_found, // could not load dbghelp.dll (Windows only) | |
| 43 helper_func_error, // decoding functions not found (Windows only) | |
| 44 helper_init_error // SymInitialize failed (Windows only) | |
| 45 }; | |
| 46 | |
| 47 // decode an pc address to corresponding function name and an offset from the beginning of | |
| 48 // the function | |
| 49 virtual bool decode(address pc, char* buf, int buflen, int* offset, | |
| 50 const char* modulepath = NULL) = 0; | |
| 51 virtual bool decode(address pc, char* buf, int buflen, int* offset, const void* base) = 0; | |
| 52 | |
| 53 // demangle a C++ symbol | |
| 54 virtual bool demangle(const char* symbol, char* buf, int buflen) = 0; | |
| 55 // if the decoder can decode symbols in vm | |
| 56 virtual bool can_decode_C_frame_in_vm() const = 0; | |
| 57 | |
| 58 virtual decoder_status status() const { | |
| 59 return _decoder_status; | |
| 60 } | |
| 61 | |
| 62 virtual bool has_error() const { | |
| 63 return is_error(_decoder_status); | |
| 64 } | |
| 65 | |
| 66 static bool is_error(decoder_status status) { | |
| 67 return (status > 0); | |
| 68 } | |
| 69 | |
| 70 protected: | |
| 71 decoder_status _decoder_status; | |
| 72 }; | |
| 73 | |
| 74 // Do nothing decoder | |
| 75 class NullDecoder : public AbstractDecoder { | |
| 76 public: | |
| 77 NullDecoder() { | |
| 78 _decoder_status = not_available; | |
| 79 } | |
| 80 | |
| 81 ~NullDecoder() {}; | |
| 82 | |
| 83 virtual bool decode(address pc, char* buf, int buflen, int* offset, | |
| 84 const char* modulepath = NULL) { | |
| 85 return false; | |
| 86 } | |
| 87 | |
| 88 virtual bool decode(address pc, char* buf, int buflen, int* offset, const void* base) { | |
| 89 return false; | |
| 90 } | |
| 91 | |
| 92 virtual bool demangle(const char* symbol, char* buf, int buflen) { | |
| 93 return false; | |
| 94 } | |
| 95 | |
| 96 virtual bool can_decode_C_frame_in_vm() const { | |
| 97 return false; | |
| 98 } | |
| 99 }; | |
| 100 | |
| 101 | |
| 102 class Decoder : AllStatic { | |
| 103 public: | |
| 104 static bool decode(address pc, char* buf, int buflen, int* offset, const char* modulepath = NULL); | |
| 105 static bool decode(address pc, char* buf, int buflen, int* offset, const void* base); | |
| 106 static bool demangle(const char* symbol, char* buf, int buflen); | |
| 107 static bool can_decode_C_frame_in_vm(); | |
| 108 | |
| 109 // shutdown shared instance | |
| 110 static void shutdown(); | |
| 111 protected: | |
| 112 // shared decoder instance, _shared_instance_lock is needed | |
| 113 static AbstractDecoder* get_shared_instance(); | |
| 114 // a private instance for error handler. Error handler can be | |
| 115 // triggered almost everywhere, including signal handler, where | |
| 116 // no lock can be taken. So the shared decoder can not be used | |
| 117 // in this scenario. | |
| 118 static AbstractDecoder* get_error_handler_instance(); | |
| 119 | |
| 120 static AbstractDecoder* create_decoder(); | |
| 121 private: | |
| 122 static AbstractDecoder* _shared_decoder; | |
| 123 static AbstractDecoder* _error_handler_decoder; | |
| 124 static NullDecoder _do_nothing_decoder; | |
| 125 | |
| 126 protected: | |
| 127 static Mutex* _shared_decoder_lock; | |
| 128 static Mutex* shared_decoder_lock(); | |
| 129 | |
| 130 friend class DecoderLocker; | |
| 131 }; | |
| 132 | |
| 133 class DecoderLocker : public MutexLockerEx { | |
| 134 AbstractDecoder* _decoder; | |
| 135 inline bool is_first_error_thread(); | |
| 136 public: | |
| 137 DecoderLocker(); | |
| 138 AbstractDecoder* decoder() { | |
| 139 return _decoder; | |
| 140 } | |
| 141 }; | |
| 142 | |
| 143 #endif // SHARE_VM_UTILITIES_DECODER_HPP |
