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1 | // -*- C++ -*- | |
2 | // | |
3 | // Copyright (C) 2009-2017 Free Software Foundation, Inc. | |
4 | // | |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | // | |
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // Under Section 7 of GPL version 3, you are granted additional | |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License along | |
21 | // with this library; see the file COPYING3. If not see | |
22 | // <http://www.gnu.org/licenses/>. | |
23 | ||
24 | /** @file profile/impl/profiler_node.h | |
25 | * @brief Data structures to represent a single profiling event. | |
26 | */ | |
27 | ||
28 | // Written by Lixia Liu and Silvius Rus. | |
29 | ||
30 | #ifndef _GLIBCXX_PROFILE_PROFILER_NODE_H | |
31 | #define _GLIBCXX_PROFILE_PROFILER_NODE_H 1 | |
32 | ||
33 | #include <cstdio> // FILE, fprintf | |
34 | ||
35 | #include <vector> | |
36 | #if defined _GLIBCXX_HAVE_EXECINFO_H | |
37 | #include <execinfo.h> | |
38 | #endif | |
39 | ||
40 | namespace __gnu_profile | |
41 | { | |
42 | typedef void* __instruction_address_t; | |
43 | typedef std::_GLIBCXX_STD_C::vector<__instruction_address_t> __stack_npt; | |
44 | typedef __stack_npt* __stack_t; | |
45 | ||
46 | std::size_t __stack_max_depth(); | |
47 | ||
48 | inline __stack_t | |
49 | __get_stack() | |
50 | { | |
51 | #if defined _GLIBCXX_HAVE_EXECINFO_H | |
52 | __try | |
53 | { | |
54 | std::size_t __max_depth = __stack_max_depth(); | |
55 | if (__max_depth == 0) | |
56 | return 0; | |
57 | __stack_npt __buffer(__max_depth); | |
58 | int __depth = backtrace(&__buffer[0], __max_depth); | |
59 | return new(std::nothrow) __stack_npt(__buffer.begin(), | |
60 | __buffer.begin() + __depth); | |
61 | } | |
62 | __catch(...) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | #else | |
67 | return 0; | |
68 | #endif | |
69 | } | |
70 | ||
71 | inline std::size_t | |
72 | __size(__stack_t __stack) | |
73 | { | |
74 | if (!__stack) | |
75 | return 0; | |
76 | else | |
77 | return __stack->size(); | |
78 | } | |
79 | ||
80 | // XXX | |
81 | inline void | |
82 | __write(FILE* __f, __stack_t __stack) | |
83 | { | |
84 | if (!__stack) | |
85 | return; | |
86 | ||
87 | __stack_npt::const_iterator __it; | |
88 | for (__it = __stack->begin(); __it != __stack->end(); ++__it) | |
89 | std::fprintf(__f, "%p ", *__it); | |
90 | } | |
91 | ||
92 | /** @brief Hash function for summary trace using call stack as index. */ | |
93 | class __stack_hash | |
94 | { | |
95 | public: | |
96 | std::size_t | |
97 | operator()(__stack_t __s) const | |
98 | { | |
99 | if (!__s) | |
100 | return 0; | |
101 | ||
102 | std::size_t __index = 0; | |
103 | __stack_npt::const_iterator __it; | |
104 | for (__it = __s->begin(); __it != __s->end(); ++__it) | |
105 | __index += reinterpret_cast<std::size_t>(*__it); | |
106 | return __index; | |
107 | } | |
108 | ||
109 | bool operator() (__stack_t __stack1, __stack_t __stack2) const | |
110 | { | |
111 | if (!__stack1 && !__stack2) | |
112 | return true; | |
113 | if (!__stack1 || !__stack2) | |
114 | return false; | |
115 | if (__stack1->size() != __stack2->size()) | |
116 | return false; | |
117 | ||
118 | std::size_t __byte_size | |
119 | = __stack1->size() * sizeof(__stack_npt::value_type); | |
120 | return __builtin_memcmp(&(*__stack1)[0], &(*__stack2)[0], | |
121 | __byte_size) == 0; | |
122 | } | |
123 | }; | |
124 | ||
125 | ||
126 | /** @brief Base class for a line in the object table. */ | |
127 | class __object_info_base | |
128 | { | |
129 | public: | |
130 | __object_info_base(__stack_t __stack) | |
131 | : _M_stack(__stack), _M_valid(true) { } | |
132 | ||
133 | bool | |
134 | __is_valid() const | |
135 | { return _M_valid; } | |
136 | ||
137 | void | |
138 | __set_invalid() | |
139 | { _M_valid = false; } | |
140 | ||
141 | void | |
142 | __merge(const __object_info_base& __o) | |
143 | { _M_valid &= __o._M_valid; } | |
144 | ||
145 | __stack_t | |
146 | __stack() const | |
147 | { return _M_stack; } | |
148 | ||
149 | protected: | |
150 | __stack_t _M_stack; | |
151 | bool _M_valid; | |
152 | }; | |
153 | ||
154 | } // namespace __gnu_profile | |
155 | #endif /* _GLIBCXX_PROFILE_PROFILER_NODE_H */ |