Thu, 28 Jun 2012 17:03:16 -0400
6995781: Native Memory Tracking (Phase 1)
7151532: DCmd for hotspot native memory tracking
Summary: Implementation of native memory tracking phase 1, which tracks VM native memory usage, and related DCmd
Reviewed-by: acorn, coleenp, fparain
1 /*
2 * Copyright (c) 1997, 2011, 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 "decoder_windows.hpp"
29 WindowsDecoder::WindowsDecoder() {
30 _dbghelp_handle = NULL;
31 _can_decode_in_vm = false;
32 _pfnSymGetSymFromAddr64 = NULL;
33 _pfnUndecorateSymbolName = NULL;
35 _decoder_status = no_error;
36 initialize();
37 }
39 void WindowsDecoder::initialize() {
40 if (!has_error() && _dbghelp_handle == NULL) {
41 HMODULE handle = ::LoadLibrary("dbghelp.dll");
42 if (!handle) {
43 _decoder_status = helper_not_found;
44 return;
45 }
47 _dbghelp_handle = handle;
49 pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions");
50 pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize");
51 _pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64");
52 _pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)GetProcAddress(handle, "UnDecorateSymbolName");
54 if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) {
55 _pfnSymGetSymFromAddr64 = NULL;
56 _pfnUndecorateSymbolName = NULL;
57 ::FreeLibrary(handle);
58 _dbghelp_handle = NULL;
59 _decoder_status = helper_func_error;
60 return;
61 }
63 _pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS);
64 if (!_pfnSymInitialize(GetCurrentProcess(), NULL, TRUE)) {
65 _pfnSymGetSymFromAddr64 = NULL;
66 _pfnUndecorateSymbolName = NULL;
67 ::FreeLibrary(handle);
68 _dbghelp_handle = NULL;
69 _decoder_status = helper_init_error;
70 return;
71 }
73 // find out if jvm.dll contains private symbols, by decoding
74 // current function and comparing the result
75 address addr = (address)Decoder::decode;
76 char buf[MAX_PATH];
77 if (decode(addr, buf, sizeof(buf), NULL)) {
78 _can_decode_in_vm = !strcmp(buf, "Decoder::decode");
79 }
80 }
81 }
83 void WindowsDecoder::uninitialize() {
84 _pfnSymGetSymFromAddr64 = NULL;
85 _pfnUndecorateSymbolName = NULL;
86 if (_dbghelp_handle != NULL) {
87 ::FreeLibrary(_dbghelp_handle);
88 }
89 _dbghelp_handle = NULL;
90 }
92 bool WindowsDecoder::can_decode_C_frame_in_vm() const {
93 return (!has_error() && _can_decode_in_vm);
94 }
97 bool WindowsDecoder::decode(address addr, char *buf, int buflen, int* offset, const char* modulepath) {
98 if (_pfnSymGetSymFromAddr64 != NULL) {
99 PIMAGEHLP_SYMBOL64 pSymbol;
100 char symbolInfo[MAX_PATH + sizeof(IMAGEHLP_SYMBOL64)];
101 pSymbol = (PIMAGEHLP_SYMBOL64)symbolInfo;
102 pSymbol->MaxNameLength = MAX_PATH;
103 pSymbol->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
104 DWORD64 displacement;
105 if (_pfnSymGetSymFromAddr64(::GetCurrentProcess(), (DWORD64)addr, &displacement, pSymbol)) {
106 if (buf != NULL) {
107 if (demangle(pSymbol->Name, buf, buflen)) {
108 jio_snprintf(buf, buflen, "%s", pSymbol->Name);
109 }
110 }
111 if(offset != NULL) *offset = (int)displacement;
112 return true;
113 }
114 }
115 if (buf != NULL && buflen > 0) buf[0] = '\0';
116 if (offset != NULL) *offset = -1;
117 return false;
118 }
120 bool WindowsDecoder::demangle(const char* symbol, char *buf, int buflen) {
121 return _pfnUndecorateSymbolName != NULL &&
122 _pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE);
123 }