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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
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children 5def270bc147
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1972:f95d63e2154a 2022:2d4762ec74af
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 "utilities/decoder.hpp"
28
29 HMODULE Decoder::_dbghelp_handle = NULL;
30 bool Decoder::_can_decode_in_vm = false;
31 pfn_SymGetSymFromAddr64 Decoder::_pfnSymGetSymFromAddr64 = NULL;
32 pfn_UndecorateSymbolName Decoder::_pfnUndecorateSymbolName = NULL;
33
34 void Decoder::initialize() {
35 if (!_initialized) {
36 _initialized = true;
37
38 HMODULE handle = ::LoadLibrary("dbghelp.dll");
39 if (!handle) {
40 _decoder_status = helper_not_found;
41 return;
42 }
43
44 _dbghelp_handle = handle;
45
46 pfn_SymSetOptions _pfnSymSetOptions = (pfn_SymSetOptions)::GetProcAddress(handle, "SymSetOptions");
47 pfn_SymInitialize _pfnSymInitialize = (pfn_SymInitialize)::GetProcAddress(handle, "SymInitialize");
48 _pfnSymGetSymFromAddr64 = (pfn_SymGetSymFromAddr64)::GetProcAddress(handle, "SymGetSymFromAddr64");
49 _pfnUndecorateSymbolName = (pfn_UndecorateSymbolName)GetProcAddress(handle, "UnDecorateSymbolName");
50
51 if (_pfnSymSetOptions == NULL || _pfnSymInitialize == NULL || _pfnSymGetSymFromAddr64 == NULL) {
52 _pfnSymGetSymFromAddr64 = NULL;
53 _pfnUndecorateSymbolName = NULL;
54 ::FreeLibrary(handle);
55 _dbghelp_handle = NULL;
56 _decoder_status = helper_func_error;
57 return;
58 }
59
60 _pfnSymSetOptions(SYMOPT_UNDNAME | SYMOPT_DEFERRED_LOADS);
61 if (!_pfnSymInitialize(GetCurrentProcess(), NULL, TRUE)) {
62 _pfnSymGetSymFromAddr64 = NULL;
63 _pfnUndecorateSymbolName = NULL;
64 ::FreeLibrary(handle);
65 _dbghelp_handle = NULL;
66 _decoder_status = helper_init_error;
67 return;
68 }
69
70 // find out if jvm.dll contains private symbols, by decoding
71 // current function and comparing the result
72 address addr = (address)Decoder::initialize;
73 char buf[MAX_PATH];
74 if (decode(addr, buf, sizeof(buf), NULL) == no_error) {
75 _can_decode_in_vm = !strcmp(buf, "Decoder::initialize");
76 }
77 }
78 }
79
80 void Decoder::uninitialize() {
81 assert(_initialized, "Decoder not yet initialized");
82 _pfnSymGetSymFromAddr64 = NULL;
83 _pfnUndecorateSymbolName = NULL;
84 if (_dbghelp_handle != NULL) {
85 ::FreeLibrary(_dbghelp_handle);
86 }
87 _initialized = false;
88 }
89
90 bool Decoder::can_decode_C_frame_in_vm() {
91 initialize();
92 return _can_decode_in_vm;
93 }
94
95
96 Decoder::decoder_status Decoder::decode(address addr, char *buf, int buflen, int *offset) {
97 assert(_initialized, "Decoder not yet initialized");
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 no_error;
113 }
114 }
115 return helper_not_found;
116 }
117
118 bool Decoder::demangle(const char* symbol, char *buf, int buflen) {
119 assert(_initialized, "Decoder not yet initialized");
120 return _pfnUndecorateSymbolName != NULL &&
121 _pfnUndecorateSymbolName(symbol, buf, buflen, UNDNAME_COMPLETE);
122 }
123