profiler_container_size.h

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// -*- C++ -*-
//
// Copyright (C) 2009-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library.  This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3.  If not see
// <http://www.gnu.org/licenses/>.

/** @file profile/impl/profiler_container_size.h
 *  @brief Diagnostics for container sizes.
 */

// Written by Lixia Liu and Silvius Rus.

#ifndef _GLIBCXX_PROFILE_PROFILER_CONTAINER_SIZE_H
#define _GLIBCXX_PROFILE_PROFILER_CONTAINER_SIZE_H 1

#include <sstream>

#include "profile/impl/profiler.h"
#include "profile/impl/profiler_node.h"
#include "profile/impl/profiler_trace.h"

namespace __gnu_profile
{
  /** @brief A container size instrumentation line in the object table.  */
  class __container_size_info
  : public __object_info_base 
  {
  public:
    __container_size_info(__stack_t __stack)
    : __object_info_base(__stack), _M_init(0), _M_max(0),
      _M_min(0), _M_total(0), _M_item_min(0), _M_item_max(0),
      _M_item_total(0), _M_count(0), _M_resize(0), _M_cost(0)
    { }

    void
    __write(FILE* __f) const
    {
      std::fprintf(__f, "%Zu %Zu %Zu %Zu %Zu %Zu %Zu %Zu %Zu %Zu\n", 
                   _M_init, _M_count, _M_cost, _M_resize, _M_min, _M_max,
                   _M_total, _M_item_min, _M_item_max, _M_item_total);
    }

    float
    __magnitude() const
    { return static_cast<float>(_M_cost); }

    std::string
    __advice() const
    {
      std::stringstream __message;
      if (_M_init < _M_item_max)
        __message << "change initial container size from " << _M_init
                  << " to " << _M_item_max;
      return __message.str();
    }

    void
    __init(std::size_t __num)
    {
      _M_init = __num;
      _M_max = __num;
    }

    void
    __merge(const __container_size_info& __o)
    {
      __object_info_base::__merge(__o);
      _M_init        = std::max(_M_init, __o._M_init);
      _M_max         = std::max(_M_max, __o._M_max);
      _M_item_max    = std::max(_M_item_max, __o._M_item_max);
      _M_min         = std::min(_M_min, __o._M_min);
      _M_item_min    = std::min(_M_item_min, __o._M_item_min);
      _M_total      += __o._M_total;
      _M_item_total += __o._M_item_total;
      _M_count      += __o._M_count;
      _M_cost       += __o._M_cost;
      _M_resize     += __o._M_resize;
    }

    // Call if a container is destructed or cleaned.
    void
    __destruct(std::size_t __num, std::size_t __inum)
    {
      _M_max = std::max(_M_max, __num);
      _M_item_max = std::max(_M_item_max, __inum);
      if (_M_min == 0)
        {
          _M_min = __num; 
          _M_item_min = __inum;
        }
      else
        {
          _M_min = std::min(_M_min, __num);
          _M_item_min = std::min(_M_item_min, __inum);
        }

      _M_total += __num;
      _M_item_total += __inum;
      _M_count += 1;
    }

    // Estimate the cost of resize/rehash. 
    float
    __resize_cost(std::size_t __from, std::size_t)
    { return __from; }

    // Call if container is resized.
    void
    __resize(std::size_t __from, std::size_t __to)
    {
      _M_cost += this->__resize_cost(__from, __to);
      _M_resize += 1;
      _M_max = std::max(_M_max, __to);
    }

  private:
    std::size_t _M_init;
    std::size_t _M_max;  // range of # buckets
    std::size_t _M_min;
    std::size_t _M_total;
    std::size_t _M_item_min;  // range of # items
    std::size_t _M_item_max;
    std::size_t _M_item_total;
    std::size_t _M_count;
    std::size_t _M_resize;
    std::size_t _M_cost;
  };

  /** @brief A container size instrumentation line in the stack table.  */
  class __container_size_stack_info
  : public __container_size_info
  {
  public:
    __container_size_stack_info(const __container_size_info& __o)
    : __container_size_info(__o) { }
  };
  
  /** @brief Container size instrumentation trace producer.  */
  class __trace_container_size
  : public __trace_base<__container_size_info, __container_size_stack_info> 
  {
  public:
    ~__trace_container_size() { }

    __trace_container_size()
    : __trace_base<__container_size_info, __container_size_stack_info>() { };

    // Insert a new node at construct with object, callstack and initial size. 
    __container_size_info*
    __insert(__stack_t __stack, std::size_t __num)
    {
      __container_size_info* __ret =  __add_object(__stack);
      if (__ret)
        __ret->__init(__num);
      return __ret;
    }

    // Call at destruction/clean to set container final size.
    void
    __destruct(__container_size_info* __obj_info,
               std::size_t __num, std::size_t __inum)
    {
      __obj_info->__destruct(__num, __inum);
      __retire_object(__obj_info);
    }
  };

} // namespace __gnu_profile
#endif /* _GLIBCXX_PROFILE_PROFILER_CONTAINER_SIZE_H */