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/* Copyright (c) 2012 Shlomi Fish
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* pseudo_dfs_cache.h - contains the implementation of the cache for
* the pseudo_dfs solver.
*
*/
#ifndef FC_SOLVE_PSEUDO_DFS_CACHE_H
#define FC_SOLVE_PSEUDO_DFS_CACHE_H
#ifdef __cplusplus
extern "C"
{
#endif
#include "config.h"
#include <Judy.h>
#include "bool.h"
#include "inline.h"
#include "alloc_wrap.h"
#include "state.h"
#include "meta_alloc.h"
#include "fcs_enums.h"
#include "fcs_dllexport.h"
#include "dbm_common.h"
#include "dbm_solver_key.h"
#include "dbm_calc_derived_iface.h"
typedef fcs_state_t fcs_pdfs_key_t;
struct fcs_pdfs_key_info_struct
{
fcs_pdfs_key_t key;
/* lower_pri and higher_pri form a doubly linked list.
*
* pri == priority.
* */
struct fcs_pdfs_key_info_struct * lower_pri, * higher_pri;
};
typedef struct fcs_pdfs_key_info_struct fcs_pdfs_cache_key_info_t;
typedef struct
{
Pvoid_t states_values_to_keys_map;
fcs_compact_allocator_t states_values_to_keys_allocator;
long count_elements_in_cache, max_num_elements_in_cache;
fcs_pdfs_cache_key_info_t * lowest_pri, * highest_pri;
#define RECYCLE_BIN_NEXT(el) ((el)->higher_pri)
fcs_pdfs_cache_key_info_t * recycle_bin;
} fcs_pdfs_lru_cache_t;
static GCC_INLINE void fcs_pdfs_cache_destroy(fcs_pdfs_lru_cache_t * cache)
{
Word_t Rc_word;
JHSFA(Rc_word, cache->states_values_to_keys_map);
fc_solve_compact_allocator_finish(&(cache->states_values_to_keys_allocator));
}
static GCC_INLINE void fcs_pdfs_cache_init(fcs_pdfs_lru_cache_t * cache, long max_num_elements_in_cache, fcs_meta_compact_allocator_t * meta_alloc)
{
cache->states_values_to_keys_map = ((Pvoid_t) NULL);
fc_solve_compact_allocator_init(
&(cache->states_values_to_keys_allocator), meta_alloc
);
cache->lowest_pri = NULL;
cache->highest_pri = NULL;
cache->recycle_bin = NULL;
cache->count_elements_in_cache = 0;
cache->max_num_elements_in_cache = max_num_elements_in_cache;
}
static GCC_INLINE fcs_bool_t fcs_pdfs_cache_does_key_exist(fcs_pdfs_lru_cache_t * cache, fcs_pdfs_key_t * key)
{
fcs_pdfs_cache_key_info_t * existing;
Word_t * PValue;
JHSG(PValue, cache->states_values_to_keys_map, key, sizeof(*key));
if (! PValue)
{
existing = NULL;
}
else
{
existing = (typeof(existing))(*PValue);
}
if (! existing)
{
return FALSE;
}
else
{
/* First - promote this key to the top of the cache. */
if (existing->higher_pri)
{
existing->higher_pri->lower_pri =
existing->lower_pri;
if (existing->lower_pri)
{
existing->lower_pri->higher_pri =
existing->higher_pri;
}
else
{
cache->lowest_pri = existing->higher_pri;
/* Bug fix: keep the chain intact. */
existing->higher_pri->lower_pri = NULL;
}
cache->highest_pri->higher_pri = existing;
existing->lower_pri = cache->highest_pri;
cache->highest_pri = existing;
existing->higher_pri = NULL;
}
return TRUE;
}
}
static GCC_INLINE fcs_pdfs_cache_key_info_t * fcs_pdfs_cache_insert(fcs_pdfs_lru_cache_t * cache, fcs_pdfs_key_t * key)
{
fcs_pdfs_cache_key_info_t * cache_key;
if (cache->count_elements_in_cache >= cache->max_num_elements_in_cache)
{
int Rc_int;
cache_key = cache->lowest_pri;
JHSD( Rc_int, cache->states_values_to_keys_map, &(cache_key->key), sizeof(cache_key->key));
cache->lowest_pri = cache->lowest_pri->higher_pri;
cache->lowest_pri->lower_pri = NULL;
}
else
{
cache_key =
(fcs_pdfs_cache_key_info_t *)
fcs_compact_alloc_ptr(
&(cache->states_values_to_keys_allocator),
sizeof(*cache_key)
);
cache->count_elements_in_cache++;
}
cache_key->key = *key;
if (cache->highest_pri)
{
cache_key->lower_pri = cache->highest_pri;
cache_key->higher_pri = NULL;
cache->highest_pri->higher_pri = cache_key;
cache->highest_pri = cache_key;
}
else
{
cache->highest_pri = cache->lowest_pri = cache_key;
cache_key->higher_pri = cache_key->lower_pri = NULL;
}
Word_t * PValue;
JHSI(PValue, cache->states_values_to_keys_map, key, sizeof(*key));
*PValue = ((Word_t)cache_key);
return cache_key;
}
#ifdef __cplusplus
}
#endif
#endif /* FC_SOLVE_PSEUDO_DFS_CACHE_H */
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