1 /* 2 * Copyright (c) 1997, 2010, 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 30 HMODULE Decoder::_dbghelp_handle = NULL; 31 bool Decoder::_can_decode_in_vm = false; 32 pfn_SymGetSymFromAddr64 Decoder::_pfnSymGetSymFromAddr64 = NULL; 33 pfn_UndecorateSymbolName Decoder::_pfnUndecorateSymbolName = NULL; 34 35 void Decoder::initialize() { 36 if (!_initialized) { 37 _initialized = true; 38 39 HINSTANCE handle = os::win32::load_Windows_dll("dbghelp.dll", NULL, 0); 40 if (!handle) { 41 _decoder_status = helper_not_found; 42 return; 43 } 44 45 _dbghelp_handle = handle; 46 47 pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions"); 48 pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize"); 49 _pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64"); 50 _pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)GetProcAddress(handle, "UnDecorateSymbolName"); 51 52 if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) { 53 _pfnSymGetSymFromAddr64 = NULL; 54 _pfnUndecorateSymbolName = NULL; 55 ::FreeLibrary(handle); 56 _dbghelp_handle = NULL; 57 _decoder_status = helper_func_error; 58 return; 59 } 60 61 _pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS); 62 if (!_pfnSymInitialize(GetCurrentProcess(), NULL, TRUE)) { 63 _pfnSymGetSymFromAddr64 = NULL; 64 _pfnUndecorateSymbolName = NULL; 65 ::FreeLibrary(handle); 66 _dbghelp_handle = NULL; 67 _decoder_status = helper_init_error; 68 return; 69 } 70 71 // find out if jvm.dll contains private symbols, by decoding 72 // current function and comparing the result 73 address addr = (address)Decoder::initialize; 74 char buf[MAX_PATH]; 75 if (decode(addr, buf, sizeof(buf), NULL) == no_error) { 76 _can_decode_in_vm = !strcmp(buf, "Decoder::initialize"); 77 } 78 } 79 } 80 81 void Decoder::uninitialize() { 82 assert(_initialized, "Decoder not yet initialized"); 83 _pfnSymGetSymFromAddr64 = NULL; 84 _pfnUndecorateSymbolName = NULL; 85 if (_dbghelp_handle != NULL) { 86 ::FreeLibrary(_dbghelp_handle); 87 } 88 _initialized = false; 89 } 90 91 bool Decoder::can_decode_C_frame_in_vm() { 92 initialize(); 93 return _can_decode_in_vm; 94 } 95 96 97 Decoder::decoder_status Decoder::decode(address addr, char *buf, int buflen, int *offset) { 98 assert(_initialized, "Decoder not yet initialized"); 99 if (_pfnSymGetSymFromAddr64 != NULL) { 100 PIMAGEHLP_SYMBOL64 pSymbol; 101 char symbolInfo[MAX_PATH + sizeof(IMAGEHLP_SYMBOL64)]; 102 pSymbol = (PIMAGEHLP_SYMBOL64)symbolInfo; 103 pSymbol->MaxNameLength = MAX_PATH; 104 pSymbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64); 105 DWORD64 displacement; 106 if (_pfnSymGetSymFromAddr64(::GetCurrentProcess(), (DWORD64)addr, &displacement, pSymbol)) { 107 if (buf != NULL) { 108 if (!demangle(pSymbol->Name, buf, buflen)) { 109 jio_snprintf(buf, buflen, "%s", pSymbol->Name); 110 } 111 } 112 if (offset != NULL) *offset = (int)displacement; 113 return no_error; 114 } 115 } 116 return helper_not_found; 117 } 118 119 bool Decoder::demangle(const char* symbol, char *buf, int buflen) { 120 assert(_initialized, "Decoder not yet initialized"); 121 return _pfnUndecorateSymbolName != NULL && 122 _pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE); 123 } 124