/*  This file is part of the program psim.

    Copyright (C) 1994-1995,1997-1998, Andrew Cagney <cagney@highland.com.au>

    This program 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 2 of the License, or
    (at your option) any later version.

    This program 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.
 
    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 
    */


#include "hw-main.h"
#include "hw-base.h"


struct hw_handle_mapping {
  cell_word external;
  struct hw *phandle;
  struct hw_instance *ihandle;
  struct hw_handle_mapping *next;
};


struct hw_handle_data {
  int nr_mappings;
  struct hw_handle_mapping *mappings;
};

void
create_hw_handle_data (struct hw *hw)
{
  if (hw_parent (hw) == NULL)
    {
      hw->handles_of_hw = HW_ZALLOC (hw, struct hw_handle_data);
    }
  else
    {
      hw->handles_of_hw = hw_root (hw)->handles_of_hw;
    }
}

void
delete_hw_handle_data (struct hw *hw)
{
  /* NULL */
}


#if 0
void
hw_handle_init (struct hw *hw)
{
  struct hw_handle_mapping *current_map = db->mappings;
  if (current_map != NULL)
    {
      db->nr_mappings = db->mappings->external;
      /* verify that the mappings that were not removed are in
	 sequence down to nr 1 */
      while (current_map->next != NULL)
	{
	  if (current_map->external != current_map->next->external + 1)
	    error ("hw_handle: hw_handle database possibly corrupt");
	  current_map = current_map->next;
	}
      ASSERT (current_map->next == NULL);
      if (current_map->external != 1)
	error ("hw_handle: hw_handle database possibly corrupt");
    }
  else
    {
      db->nr_mappings = 0;
    }
}
#endif


struct hw_instance *
hw_handle_ihandle2 (struct hw *hw,
		    cell_word external)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  struct hw_handle_mapping *current_map = db->mappings;
  while (current_map != NULL)
    {
      if (current_map->external == external)
	return current_map->ihandle;
      current_map = current_map->next;
    }
  return (void*)0;
}


struct hw *
hw_handle_phandle2 (struct hw *hw,
		    cell_word external)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  struct hw_handle_mapping *current_map = db->mappings;
  while (current_map != NULL)
    {
      if (current_map->external == external)
	return current_map->phandle;
      current_map = current_map->next;
    }
  return (void*)0;
}


cell_word
hw_handle_2ihandle (struct hw *hw,
		    struct hw_instance *internal)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  struct hw_handle_mapping *current_map = db->mappings;
  while (current_map != NULL)
    {
      if (current_map->ihandle == internal)
	return current_map->external;
      current_map = current_map->next;
    }
  return 0;
}


cell_word
hw_handle_2phandle (struct hw *hw,
		    struct hw *internal)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  struct hw_handle_mapping *current_map = db->mappings;
  while (current_map != NULL)
    {
      if (current_map->phandle == internal)
	return current_map->external;
      current_map = current_map->next;
    }
  return 0;
}


void
hw_handle_add_ihandle (struct hw *hw,
		       struct hw_instance *internal)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  if (hw_handle_2ihandle (hw, internal) != 0) 
    {
      hw_abort (hw, "attempting to add an ihandle already in the data base");
    }
  else
    {
      /* insert at the front making things in decending order */
      struct hw_handle_mapping *new_map = ZALLOC (struct hw_handle_mapping);
      new_map->next = db->mappings;
      new_map->ihandle = internal;
      db->nr_mappings += 1;
      new_map->external = db->nr_mappings;
      db->mappings = new_map;
    }
}


void
hw_handle_add_phandle (struct hw *hw,
		       struct hw *internal)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  if (hw_handle_2phandle (hw, internal) != 0) 
    {
      hw_abort (hw, "attempting to add a phandle already in the data base");
    }
  else
    {
      /* insert at the front making things in decending order */
      struct hw_handle_mapping *new_map = ZALLOC (struct hw_handle_mapping);
      new_map->next = db->mappings;
      new_map->phandle = internal;
      db->nr_mappings += 1;
      new_map->external = db->nr_mappings;
      db->mappings = new_map;
    }
}


void
hw_handle_remove_ihandle (struct hw *hw,
			  struct hw_instance *internal)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  struct hw_handle_mapping **current_map = &db->mappings;
  while (*current_map != NULL)
    {
      if ((*current_map)->ihandle == internal)
	{
	  struct hw_handle_mapping *delete = *current_map;
	  *current_map = delete->next;
	  zfree (delete);
	  return;
	}
      current_map = &(*current_map)->next;
    }
  hw_abort (hw, "attempt to remove nonexistant ihandle");
}


void
hw_handle_remove_phandle (struct hw *hw,
			  struct hw *internal)
{
  struct hw_handle_data *db = hw->handles_of_hw;
  struct hw_handle_mapping **current_map = &db->mappings;
  while (*current_map != NULL)
    {
      if ((*current_map)->phandle == internal)
	{
	  struct hw_handle_mapping *delete = *current_map;
	  *current_map = delete->next;
	  zfree (delete);
	  return;
	}
      current_map = &(*current_map)->next;
    }
  hw_abort (hw, "attempt to remove nonexistant phandle");
}