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annotate src/os/windows/vm/decoder_windows.cpp @ 2022:2d4762ec74af

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7003748: Decode C stack frames when symbols are presented (PhoneHome project) Summary: Implemented in-process C native stack frame decoding when symbols are available. Reviewed-by: coleenp, never
author zgu
date Sat, 11 Dec 2010 13:20:56 -0500
parents
children 5def270bc147
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2022
2d4762ec74af 7003748: Decode C stack frames when symbols are presented (PhoneHome project)
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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 "utilities/decoder.hpp"
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28
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29 HMODULE Decoder::_dbghelp_handle = NULL;
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30 bool Decoder::_can_decode_in_vm = false;
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31 pfn_SymGetSymFromAddr64 Decoder::_pfnSymGetSymFromAddr64 = NULL;
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32 pfn_UndecorateSymbolName Decoder::_pfnUndecorateSymbolName = NULL;
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33
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34 void Decoder::initialize() {
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35 if (!_initialized) {
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36 _initialized = true;
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37
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38 HMODULE handle = ::LoadLibrary("dbghelp.dll");
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39 if (!handle) {
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40 _decoder_status = helper_not_found;
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41 return;
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42 }
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43
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44 _dbghelp_handle = handle;
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45
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46 pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions");
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47 pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize");
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48 _pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64");
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49 _pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)GetProcAddress(handle, "UnDecorateSymbolName");
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50
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51 if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) {
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52 _pfnSymGetSymFromAddr64 = NULL;
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53 _pfnUndecorateSymbolName = NULL;
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54 ::FreeLibrary(handle);
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55 _dbghelp_handle = NULL;
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56 _decoder_status = helper_func_error;
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57 return;
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58 }
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59
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60 _pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS);
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61 if (!_pfnSymInitialize(GetCurrentProcess(), NULL, TRUE)) {
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62 _pfnSymGetSymFromAddr64 = NULL;
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63 _pfnUndecorateSymbolName = NULL;
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64 ::FreeLibrary(handle);
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65 _dbghelp_handle = NULL;
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66 _decoder_status = helper_init_error;
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67 return;
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68 }
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69
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70 // find out if jvm.dll contains private symbols, by decoding
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71 // current function and comparing the result
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72 address addr = (address)Decoder::initialize;
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73 char buf[MAX_PATH];
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74 if (decode(addr, buf, sizeof(buf), NULL) == no_error) {
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75 _can_decode_in_vm = !strcmp(buf, "Decoder::initialize");
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76 }
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77 }
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78 }
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79
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80 void Decoder::uninitialize() {
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81 assert(_initialized, "Decoder not yet initialized");
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82 _pfnSymGetSymFromAddr64 = NULL;
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83 _pfnUndecorateSymbolName = NULL;
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84 if (_dbghelp_handle != NULL) {
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85 ::FreeLibrary(_dbghelp_handle);
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86 }
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87 _initialized = false;
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88 }
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89
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90 bool Decoder::can_decode_C_frame_in_vm() {
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91 initialize();
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92 return _can_decode_in_vm;
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93 }
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94
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95
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96 Decoder::decoder_status Decoder::decode(address addr, char *buf, int buflen, int *offset) {
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97 assert(_initialized, "Decoder not yet initialized");
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98 if (_pfnSymGetSymFromAddr64 != NULL) {
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99 PIMAGEHLP_SYMBOL64 pSymbol;
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100 char symbolInfo[MAX_PATH + sizeof(IMAGEHLP_SYMBOL64)];
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101 pSymbol = (PIMAGEHLP_SYMBOL64)symbolInfo;
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102 pSymbol->MaxNameLength = MAX_PATH;
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103 pSymbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
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104 DWORD64 displacement;
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105 if (_pfnSymGetSymFromAddr64(::GetCurrentProcess(), (DWORD64)addr, &displacement, pSymbol)) {
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106 if (buf != NULL) {
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107 if (!demangle(pSymbol->Name, buf, buflen)) {
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108 jio_snprintf(buf, buflen, "%s", pSymbol->Name);
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109 }
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110 }
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111 if (offset != NULL) *offset = (int)displacement;
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112 return no_error;
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113 }
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114 }
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115 return helper_not_found;
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116 }
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117
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118 bool Decoder::demangle(const char* symbol, char *buf, int buflen) {
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119 assert(_initialized, "Decoder not yet initialized");
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120 return _pfnUndecorateSymbolName != NULL &&
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121 _pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE);
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122 }
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123