libstdc++
profiler_node.h
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1 // -*- C++ -*-
2 //
3 // Copyright (C) 2009-2018 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. */
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 */
GNU profile code for public use.
Hash function for summary trace using call stack as index.
Definition: profiler_node.h:93
Base class for a line in the object table.