decoder_windows.cpp revision 2596:b1cbb0907b36 
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
30HMODULE                   Decoder::_dbghelp_handle = NULL;
31bool                      Decoder::_can_decode_in_vm = false;
32pfn_SymGetSymFromAddr64   Decoder::_pfnSymGetSymFromAddr64 = NULL;
33pfn_UndecorateSymbolName  Decoder::_pfnUndecorateSymbolName = NULL;
34
35void 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
81void 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
91bool Decoder::can_decode_C_frame_in_vm() {
92  initialize();
93  return  _can_decode_in_vm;
94}
95
96
97Decoder::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
119bool 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
125