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// -*- C++ -*-

//

// Copyright (C) 2009, 2010, 2011 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_hash_func.h

 *  @brief Data structures to represent profiling traces.

 */

// Written by Lixia Liu and Silvius Rus.

#ifndef _GLIBCXX_PROFILE_PROFILER_HASH_FUNC_H

#define _GLIBCXX_PROFILE_PROFILER_HASH_FUNC_H 1

#include "profile/impl/profiler.h"

#include "profile/impl/profiler_node.h"

#include "profile/impl/profiler_trace.h"

namespace __gnu_profile

{

  /** @brief A hash performance instrumentation line in the object table.  */

  class __hashfunc_info

  : public __object_info_base

  {

  public:

    __hashfunc_info()

    : _M_longest_chain(0), _M_accesses(0), _M_hops(0) { }

    __hashfunc_info(const __hashfunc_info& __o)

    : __object_info_base(__o), _M_longest_chain(__o._M_longest_chain),

      _M_accesses(__o._M_accesses), _M_hops(__o._M_hops) { }

    __hashfunc_info(__stack_t __stack)

    : __object_info_base(__stack), _M_longest_chain(0),

      _M_accesses(0), _M_hops(0) { }

    virtual ~__hashfunc_info() { }

    void

    __merge(const __hashfunc_info& __o)

    {

      _M_longest_chain  = std::max(_M_longest_chain, __o._M_longest_chain);

      _M_accesses      += __o._M_accesses;

      _M_hops          += __o._M_hops;

    }

    void

    __destruct(std::size_t __chain, std::size_t __accesses,

               std::size_t __hops)

    {

      _M_longest_chain  = std::max(_M_longest_chain, __chain);

      _M_accesses      += __accesses;

      _M_hops          += __hops;

    }

    void

    __write(FILE* __f) const

    { std::fprintf(__f, "%Zu %Zu %Zu\n", _M_hops,

                   _M_accesses, _M_longest_chain); }

    float

    __magnitude() const

    { return static_cast<float>(_M_hops); }

    std::string

    __advice() const

    { return "change hash function"; }

  private:

    std::size_t _M_longest_chain;

    std::size_t _M_accesses;

    std::size_t _M_hops;

  };

  /** @brief A hash performance instrumentation line in the stack table.  */

  class __hashfunc_stack_info

  : public __hashfunc_info

  {

  public:

    __hashfunc_stack_info(const __hashfunc_info& __o)

    : __hashfunc_info(__o) { }

  };

  /** @brief Hash performance instrumentation producer.  */

  class __trace_hash_func

  : public __trace_base<__hashfunc_info, __hashfunc_stack_info>

  {

  public:

    __trace_hash_func()

    : __trace_base<__hashfunc_info, __hashfunc_stack_info>()

    { __id = "hash-distr"; }

    ~__trace_hash_func() {}

    // Insert a new node at construct with object, callstack and initial size.

    void

    __insert(__object_t __obj, __stack_t __stack)

    { __add_object(__obj, __hashfunc_info(__stack)); }

    // Call at destruction/clean to set container final size.

    void

    __destruct(const void* __obj, std::size_t __chain,

               std::size_t __accesses, std::size_t __hops)

    {

      if (!__is_on())

        return;

      // First find the item from the live objects and update the informations.

      __hashfunc_info* __objs = __get_object_info(__obj);

      if (!__objs)

        return;

      __objs->__destruct(__chain, __accesses, __hops);

      __retire_object(__obj);

    }

  };

  inline void

  __trace_hash_func_init()

  { _GLIBCXX_PROFILE_DATA(_S_hash_func) = new __trace_hash_func(); }

  inline void

  __trace_hash_func_report(FILE* __f, __warning_vector_t& __warnings)

  {

    if (_GLIBCXX_PROFILE_DATA(_S_hash_func))

      {

        _GLIBCXX_PROFILE_DATA(_S_hash_func)->__collect_warnings(__warnings);

        _GLIBCXX_PROFILE_DATA(_S_hash_func)->__write(__f);

      }

  }

  inline void

  __trace_hash_func_construct(const void* __obj)

  {

    if (!__profcxx_init())

      return;

    _GLIBCXX_PROFILE_DATA(_S_hash_func)->__insert(__obj, __get_stack());

  }

  inline void

  __trace_hash_func_destruct(const void* __obj, std::size_t __chain,

                             std::size_t __accesses, std::size_t __hops)

  {

    if (!__profcxx_init())

      return;

    _GLIBCXX_PROFILE_DATA(_S_hash_func)->__destruct(__obj, __chain,

                                                    __accesses, __hops);

  }

} // namespace __gnu_profile

#endif /* _GLIBCXX_PROFILE_PROFILER_HASH_FUNC_H */