libstdc++-v3/include/profile/impl/profiler_node.h

   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 */