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yap-6.3/library/tries/base_dbtries.c

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C

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% $Date: 2010-06-30 17:05:24 +0200 (Wed, 30 Jun 2010) $
% $Revision: 1 $
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% University of Porto
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% Copyright 2010 Katholieke Universiteit Leuven & University of Porto
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% Main authors of this file: Mantadelis Theofrastos, Ricardo Rocha
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
#include <stdlib.h>
/* -------------------------- */
/* Local Procedures */
/* -------------------------- */
static void simplification_reduction(TrEntry trie);
static TrNode depth_reduction(TrEntry trie, TrNode depth_node, YAP_Int opt_level);
static TrNode breadth_reduction(TrEntry trie, TrNode breadth_node, YAP_Int opt_level);
static inline int compare_label_nodes(TrData data1, TrData data2);
static inline void move_after(TrData data_source, TrData data_dest);
static inline void move_last_data_after(TrData moveto_data);
static inline void set_depth_breadth_reduction_current_data(TrData data);
/* -------------------------- */
/* Local Variables */
/* -------------------------- */
static TrData CURRENT_DEPTH_BREADTH_DATA;
/* -------------------------- */
/* API */
/* -------------------------- */
YAP_Term trie_depth_breadth(TrEntry trie, TrEntry db_trie, YAP_Int opt_level, YAP_Int start_counter, YAP_Int *end_counter) {
TrNode depth_node, breadth_node, nested_trie;
core_set_label_counter(start_counter);
CURRENT_TRIE = db_trie;
core_set_trie_db_return_term(YAP_MkAtomTerm(YAP_LookupAtom("false")));
core_initialize_depth_breadth_trie(TrEntry_trie(db_trie), &depth_node, &breadth_node);
set_depth_breadth_reduction_current_data(NULL);
/* We only need to simplify the trie once! */
/* This can be a 10% overhead for sld cases :-( */
if (TrNode_child(TrEntry_trie(trie)))
simplification_reduction(trie);
while (TrNode_child(TrEntry_trie(trie))) {
nested_trie = depth_reduction(trie, depth_node, opt_level);
if (nested_trie) {
set_depth_breadth_reduction_current_data(get_data_from_trie_node(nested_trie));
core_finalize_depth_breadth_trie(depth_node, breadth_node);
*end_counter = core_get_label_counter();
return YAP_MkApplTerm((YAP_Functor)(~ApplTag & TrNode_entry(TrNode_parent(nested_trie))), 1, &TrNode_entry(nested_trie));
}
nested_trie = breadth_reduction(trie, breadth_node, opt_level);
if (nested_trie) {
set_depth_breadth_reduction_current_data(get_data_from_trie_node(nested_trie));
core_finalize_depth_breadth_trie(depth_node, breadth_node);
*end_counter = core_get_label_counter();
return YAP_MkApplTerm((YAP_Functor)(~ApplTag & TrNode_entry(TrNode_parent(nested_trie))), 1, &TrNode_entry(nested_trie));
}
}
core_finalize_depth_breadth_trie(depth_node, breadth_node);
*end_counter = core_get_label_counter();
return core_get_trie_db_return_term();
}
YAP_Int trie_get_db_opt_level_count(YAP_Int opt_level) {
return core_db_trie_get_optimization_level_count(opt_level);
}
TrData trie_get_depth_breadth_reduction_current_data(void) {
return CURRENT_DEPTH_BREADTH_DATA;
}
void trie_replace_nested_trie(TrEntry trie, YAP_Int nested_trie_id, YAP_Term new_term) {
core_depth_breadth_trie_replace_nested_trie(TrNode_child(TrEntry_trie(trie)), nested_trie_id, new_term);
return;
}
YAP_Int trie_get_db_opt_min_prefix(void) {
return core_get_trie_db_opt_min_prefix();
}
void trie_set_db_opt_min_prefix(YAP_Int min_prefix) {
core_set_trie_db_opt_min_prefix(min_prefix);
return;
}
/* -------------------------- */
/* Local Procedures */
/* -------------------------- */
static inline
void set_depth_breadth_reduction_current_data(TrData data) {
CURRENT_DEPTH_BREADTH_DATA = data;
return;
}
static
void simplification_reduction(TrEntry trie) {
TrNode node;
TrData stop_data, new_data, data = NULL;
stop_data = TrData_previous(TrEntry_first_data(trie));
data = TrEntry_traverse_data(trie) = TrEntry_last_data(trie);
while ((data != stop_data) && (data != NULL)) {
node = core_simplification_reduction(TRIE_ENGINE, TrData_leaf(data), &trie_data_destruct);
if (node) {
new_trie_data(new_data, trie, node);
PUT_DATA_IN_LEAF_TRIE_NODE(node, new_data);
}
if (data == TrEntry_traverse_data(trie)) {
data = TrData_previous(data);
TrEntry_traverse_data(trie) = data;
} else
data = TrEntry_traverse_data(trie);
}
}
static
TrNode depth_reduction(TrEntry trie, TrNode depth_node, YAP_Int opt_level) {
TrNode node;
TrData stop_data, new_data, data = NULL;
stop_data = TrData_previous(TrEntry_first_data(trie));
data = TrEntry_traverse_data(trie) = TrEntry_last_data(trie);
while (data != stop_data) {
node = core_depth_reduction(TRIE_ENGINE, TrData_leaf(data), depth_node, opt_level, &trie_data_construct, &trie_data_destruct, &trie_data_copy, &trie_data_order_correction);
if (node && IS_FUNCTOR_NODE(TrNode_parent(node)) && (strcmp(YAP_AtomName(YAP_NameOfFunctor((YAP_Functor)(~ApplTag & TrNode_entry(TrNode_parent(node))))), NESTED_TRIE_TERM) == 0)) {
//nested trie stop procedure return nested trie node
return node;
}
if (node) {
new_trie_data(new_data, trie, node);
PUT_DATA_IN_LEAF_TRIE_NODE(node, new_data);
}
if (data == TrEntry_traverse_data(trie)) {
data = TrData_previous(data);
TrEntry_traverse_data(trie) = data;
} else
data = TrEntry_traverse_data(trie);
}
return NULL;
}
static
TrNode breadth_reduction(TrEntry trie, TrNode breadth_node, YAP_Int opt_level) {
TrNode node;
TrData stop_data, new_data, data = NULL;
stop_data = TrData_previous(TrEntry_first_data(trie));
data = TrEntry_traverse_data(trie) = TrEntry_last_data(trie);
while ((data != stop_data) && (data != NULL)) {
node = core_breadth_reduction(TRIE_ENGINE, TrData_leaf(data), breadth_node, opt_level, &trie_data_construct, &trie_data_destruct, &trie_data_copy, &trie_data_order_correction);
if (node && IS_FUNCTOR_NODE(TrNode_parent(node)) && (strcmp(YAP_AtomName(YAP_NameOfFunctor((YAP_Functor)(~ApplTag & TrNode_entry(TrNode_parent(node))))), NESTED_TRIE_TERM) == 0)) {
//nested trie stop procedure return nested trie node
return node;
}
if (node) {
new_trie_data(new_data, trie, node);
PUT_DATA_IN_LEAF_TRIE_NODE(node, new_data);
}
if (data == TrEntry_traverse_data(trie)) {
data = TrData_previous(data);
TrEntry_traverse_data(trie) = data;
} else
data = TrEntry_traverse_data(trie);
}
return NULL;
}
static inline
void move_last_data_after(TrData moveto_data) {
TrEntry trie = CURRENT_TRIE;
TrData last_data = TrEntry_last_data(trie);
TrEntry_last_data(trie) = TrData_previous(last_data);
TrData_next(TrData_previous(last_data)) = TrData_next(last_data);
if (moveto_data == TrData_previous(TrEntry_first_data(trie))) {
TrData_next(last_data) = TrEntry_first_data(trie);
TrEntry_first_data(trie) = last_data;
} else {
TrData_next(last_data) = TrData_next(moveto_data);
TrData_next(moveto_data) = last_data;
}
TrData_previous(last_data) = moveto_data;
TrData_previous(TrData_next(last_data)) = last_data;
return;
}
static inline
void move_after(TrData data_source, TrData data_dest) {
TrEntry trie = CURRENT_TRIE;
if (data_source == TrEntry_first_data(trie))
TrEntry_first_data(trie) = TrData_next(data_source);
else
TrData_next(TrData_previous(data_source)) = TrData_next(data_source);
if (data_source == TrEntry_last_data(trie))
TrEntry_last_data(trie) = TrData_previous(data_source);
else
TrData_previous(TrData_next(data_source)) = TrData_previous(data_source);
if (data_dest == TrData_previous(TrEntry_first_data(trie))) {
TrData_next(data_source) = TrEntry_first_data(trie);
TrData_previous(TrEntry_first_data(trie)) = data_source;
TrEntry_first_data(trie) = data_source;
} else {
TrData_next(data_source) = TrData_next(data_dest);
if (data_dest == TrEntry_last_data(trie))
TrEntry_last_data(trie) = data_source;
else
TrData_previous(TrData_next(data_dest)) = data_source;
TrData_next(data_dest) = data_source;
}
TrData_previous(data_source) = data_dest;
return;
}
void trie_data_order_correction(void) {
TrEntry trie = CURRENT_TRIE;
TrData inserted_data = TrEntry_last_data(trie);
TrData moved_data = TrData_previous(inserted_data);
TrData moveto_data = TrData_previous(moved_data);
while((moveto_data != TrData_previous(TrEntry_first_data(trie))) && (compare_label_nodes(moveto_data, inserted_data) == 1)) {
if (compare_label_nodes(moveto_data, moved_data) == 2)
moved_data = moveto_data;
moveto_data = TrData_previous(moveto_data);
}
move_last_data_after(moveto_data);
do {
moveto_data = TrData_next(inserted_data);
while(compare_label_nodes(moveto_data, moved_data) == 2)
moveto_data = TrData_next(moveto_data);
inserted_data = moved_data;
moved_data = TrData_next(moved_data);
if (moved_data != moveto_data)
move_after(inserted_data, TrData_previous(moveto_data));
} while(moved_data);
return;
}
static inline
int compare_label_nodes(TrData data1, TrData data2) {
YAP_Term t1 = TrNode_entry(TrData_leaf(data1)), t2 = TrNode_entry(TrData_leaf(data2));
YAP_Int i1 = atol(YAP_AtomName(YAP_AtomOfTerm(t1)) + 1), i2 = atol(YAP_AtomName(YAP_AtomOfTerm(t2)) + 1);
if (i1 == i2) return 0;
if (i1 > i2) return 1;
return 2;
}