Wed, 27 Apr 2016 01:25:04 +0800
Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17
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 */
25 #include "precompiled.hpp"
26 #include "prims/jvm.h"
27 #include "runtime/arguments.hpp"
28 #include "decoder_windows.hpp"
30 WindowsDecoder::WindowsDecoder() {
31 _dbghelp_handle = NULL;
32 _can_decode_in_vm = false;
33 _pfnSymGetSymFromAddr64 = NULL;
34 _pfnUndecorateSymbolName = NULL;
35 #ifdef AMD64
36 _pfnStackWalk64 = NULL;
37 _pfnSymFunctionTableAccess64 = NULL;
38 _pfnSymGetModuleBase64 = NULL;
39 #endif
40 _decoder_status = no_error;
41 initialize();
42 }
44 void WindowsDecoder::initialize() {
45 if (!has_error() && _dbghelp_handle == NULL) {
46 HMODULE handle = ::LoadLibrary("dbghelp.dll");
47 if (!handle) {
48 _decoder_status = helper_not_found;
49 return;
50 }
52 _dbghelp_handle = handle;
54 pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions");
55 pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize");
56 _pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64");
57 _pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)::GetProcAddress(handle, "UnDecorateSymbolName");
59 if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) {
60 uninitialize();
61 _decoder_status = helper_func_error;
62 return;
63 }
65 #ifdef AMD64
66 _pfnStackWalk64 = (pfn_StackWalk64)::GetProcAddress(handle, "StackWalk64");
67 _pfnSymFunctionTableAccess64 = (pfn_SymFunctionTableAccess64)::GetProcAddress(handle, "SymFunctionTableAccess64");
68 _pfnSymGetModuleBase64 = (pfn_SymGetModuleBase64)::GetProcAddress(handle, "SymGetModuleBase64");
69 if (_pfnStackWalk64 == NULL || _pfnSymFunctionTableAccess64 == NULL || _pfnSymGetModuleBase64 == NULL) {
70 // We can't call StackWalk64 to walk the stack, but we are still
71 // able to decode the symbols. Let's limp on.
72 _pfnStackWalk64 = NULL;
73 _pfnSymFunctionTableAccess64 = NULL;
74 _pfnSymGetModuleBase64 = NULL;
75 }
76 #endif
78 HANDLE hProcess = ::GetCurrentProcess();
79 _pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS | SYMOPT_EXACT_SYMBOLS);
80 if (!_pfnSymInitialize(hProcess, NULL, TRUE)) {
81 _pfnSymGetSymFromAddr64 = NULL;
82 _pfnUndecorateSymbolName = NULL;
83 ::FreeLibrary(handle);
84 _dbghelp_handle = NULL;
85 _decoder_status = helper_init_error;
86 return;
87 }
89 // set pdb search paths
90 pfn_SymSetSearchPath _pfn_SymSetSearchPath =
91 (pfn_SymSetSearchPath)::GetProcAddress(handle, "SymSetSearchPath");
92 pfn_SymGetSearchPath _pfn_SymGetSearchPath =
93 (pfn_SymGetSearchPath)::GetProcAddress(handle, "SymGetSearchPath");
94 if (_pfn_SymSetSearchPath != NULL && _pfn_SymGetSearchPath != NULL) {
95 char paths[MAX_PATH];
96 int len = sizeof(paths);
97 if (!_pfn_SymGetSearchPath(hProcess, paths, len)) {
98 paths[0] = '\0';
99 } else {
100 // available spaces in path buffer
101 len -= (int)strlen(paths);
102 }
104 char tmp_path[MAX_PATH];
105 DWORD dwSize;
106 HMODULE hJVM = ::GetModuleHandle("jvm.dll");
107 tmp_path[0] = '\0';
108 // append the path where jvm.dll is located
109 if (hJVM != NULL && (dwSize = ::GetModuleFileName(hJVM, tmp_path, sizeof(tmp_path))) > 0) {
110 while (dwSize > 0 && tmp_path[dwSize] != '\\') {
111 dwSize --;
112 }
114 tmp_path[dwSize] = '\0';
116 if (dwSize > 0 && len > (int)dwSize + 1) {
117 strncat(paths, os::path_separator(), 1);
118 strncat(paths, tmp_path, dwSize);
119 len -= dwSize + 1;
120 }
121 }
123 // append $JRE/bin. Arguments::get_java_home actually returns $JRE
124 // path
125 char *p = Arguments::get_java_home();
126 assert(p != NULL, "empty java home");
127 size_t java_home_len = strlen(p);
128 if (len > (int)java_home_len + 5) {
129 strncat(paths, os::path_separator(), 1);
130 strncat(paths, p, java_home_len);
131 strncat(paths, "\\bin", 4);
132 len -= (int)(java_home_len + 5);
133 }
135 // append $JDK/bin path if it exists
136 assert(java_home_len < MAX_PATH, "Invalid path length");
137 // assume $JRE is under $JDK, construct $JDK/bin path and
138 // see if it exists or not
139 if (strncmp(&p[java_home_len - 3], "jre", 3) == 0) {
140 strncpy(tmp_path, p, java_home_len - 3);
141 tmp_path[java_home_len - 3] = '\0';
142 strncat(tmp_path, "bin", 3);
144 // if the directory exists
145 DWORD dwAttrib = GetFileAttributes(tmp_path);
146 if (dwAttrib != INVALID_FILE_ATTRIBUTES &&
147 (dwAttrib & FILE_ATTRIBUTE_DIRECTORY)) {
148 // tmp_path should have the same length as java_home_len, since we only
149 // replaced 'jre' with 'bin'
150 if (len > (int)java_home_len + 1) {
151 strncat(paths, os::path_separator(), 1);
152 strncat(paths, tmp_path, java_home_len);
153 }
154 }
155 }
157 _pfn_SymSetSearchPath(hProcess, paths);
158 }
160 // find out if jvm.dll contains private symbols, by decoding
161 // current function and comparing the result
162 address addr = (address)Decoder::demangle;
163 char buf[MAX_PATH];
164 if (decode(addr, buf, sizeof(buf), NULL)) {
165 _can_decode_in_vm = !strcmp(buf, "Decoder::demangle");
166 }
167 }
168 }
170 void WindowsDecoder::uninitialize() {
171 _pfnSymGetSymFromAddr64 = NULL;
172 _pfnUndecorateSymbolName = NULL;
173 #ifdef AMD64
174 _pfnStackWalk64 = NULL;
175 _pfnSymFunctionTableAccess64 = NULL;
176 _pfnSymGetModuleBase64 = NULL;
177 #endif
178 if (_dbghelp_handle != NULL) {
179 ::FreeLibrary(_dbghelp_handle);
180 }
181 _dbghelp_handle = NULL;
182 }
184 bool WindowsDecoder::can_decode_C_frame_in_vm() const {
185 return (!has_error() && _can_decode_in_vm);
186 }
189 bool WindowsDecoder::decode(address addr, char *buf, int buflen, int* offset, const char* modulepath) {
190 if (_pfnSymGetSymFromAddr64 != NULL) {
191 PIMAGEHLP_SYMBOL64 pSymbol;
192 char symbolInfo[MAX_PATH + sizeof(IMAGEHLP_SYMBOL64)];
193 pSymbol = (PIMAGEHLP_SYMBOL64)symbolInfo;
194 pSymbol->MaxNameLength = MAX_PATH;
195 pSymbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
196 DWORD64 displacement;
197 if (_pfnSymGetSymFromAddr64(::GetCurrentProcess(), (DWORD64)addr, &displacement, pSymbol)) {
198 if (buf != NULL) {
199 if (demangle(pSymbol->Name, buf, buflen)) {
200 jio_snprintf(buf, buflen, "%s", pSymbol->Name);
201 }
202 }
203 if(offset != NULL) *offset = (int)displacement;
204 return true;
205 }
206 }
207 if (buf != NULL && buflen > 0) buf[0] = '\0';
208 if (offset != NULL) *offset = -1;
209 return false;
210 }
212 bool WindowsDecoder::demangle(const char* symbol, char *buf, int buflen) {
213 return _pfnUndecorateSymbolName != NULL &&
214 _pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE);
215 }
217 #ifdef AMD64
218 BOOL WindowsDbgHelp::StackWalk64(DWORD MachineType,
219 HANDLE hProcess,
220 HANDLE hThread,
221 LPSTACKFRAME64 StackFrame,
222 PVOID ContextRecord,
223 PREAD_PROCESS_MEMORY_ROUTINE64 ReadMemoryRoutine,
224 PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
225 PGET_MODULE_BASE_ROUTINE64 GetModuleBaseRoutine,
226 PTRANSLATE_ADDRESS_ROUTINE64 TranslateAddress) {
227 DecoderLocker locker;
228 WindowsDecoder* wd = (WindowsDecoder*)locker.decoder();
230 if (!wd->has_error() && wd->_pfnStackWalk64) {
231 return wd->_pfnStackWalk64(MachineType,
232 hProcess,
233 hThread,
234 StackFrame,
235 ContextRecord,
236 ReadMemoryRoutine,
237 FunctionTableAccessRoutine,
238 GetModuleBaseRoutine,
239 TranslateAddress);
240 } else {
241 return false;
242 }
243 }
245 PVOID WindowsDbgHelp::SymFunctionTableAccess64(HANDLE hProcess, DWORD64 AddrBase) {
246 DecoderLocker locker;
247 WindowsDecoder* wd = (WindowsDecoder*)locker.decoder();
249 if (!wd->has_error() && wd->_pfnSymFunctionTableAccess64) {
250 return wd->_pfnSymFunctionTableAccess64(hProcess, AddrBase);
251 } else {
252 return NULL;
253 }
254 }
256 pfn_SymFunctionTableAccess64 WindowsDbgHelp::pfnSymFunctionTableAccess64() {
257 DecoderLocker locker;
258 WindowsDecoder* wd = (WindowsDecoder*)locker.decoder();
260 if (!wd->has_error()) {
261 return wd->_pfnSymFunctionTableAccess64;
262 } else {
263 return NULL;
264 }
265 }
267 pfn_SymGetModuleBase64 WindowsDbgHelp::pfnSymGetModuleBase64() {
268 DecoderLocker locker;
269 WindowsDecoder* wd = (WindowsDecoder*)locker.decoder();
271 if (!wd->has_error()) {
272 return wd->_pfnSymGetModuleBase64;
273 } else {
274 return NULL;
275 }
276 }
278 #endif // AMD64