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yap-6.3/OPTYap/tab.tries.c

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/**********************************************************************
The OPTYap Prolog system
OPTYap extends the Yap Prolog system to support or-parallel tabling
Copyright: R. Rocha and NCC - University of Porto, Portugal
File: tab.tries.C
version: $Id: tab.tries.c,v 1.24 2008-05-20 18:25:37 ricroc Exp $
**********************************************************************/
/* ------------------ **
** Includes **
** ------------------ */
#include "Yap.h"
#ifdef TABLING
#include <stdio.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#include "Yatom.h"
#include "Heap.h"
#include "yapio.h"
#include "tab.macros.h"
/* ------------------------------------- **
** Local functions declaration **
** ------------------------------------- */
#ifdef YAPOR
#ifdef TABLING_INNER_CUTS
static int update_answer_trie_branch(ans_node_ptr previous_node, ans_node_ptr current_node);
#else
static int update_answer_trie_branch(ans_node_ptr current_node);
#endif /* TABLING_INNER_CUTS */
#else
static void update_answer_trie_branch(ans_node_ptr current_node, int position);
#endif /* YAPOR */
static void traverse_subgoal_trie(sg_node_ptr current_node, char *str, int str_index, int *arity, int mode, int position);
static void traverse_answer_trie(ans_node_ptr current_node, char *str, int str_index, int *arity, int var_index, int mode, int position);
static void traverse_trie_node(Term t, char *str, int *str_index_ptr, int *arity, int *mode_ptr, int type);
#ifdef GLOBAL_TRIE
static void free_global_trie_branch(gt_node_ptr current_node);
static void traverse_global_trie(gt_node_ptr current_node, char *str, int str_index, int *arity, int mode, int position);
static void traverse_global_trie_for_subgoal(gt_node_ptr current_node, char *str, int *str_index, int *arity, int *mode);
static void traverse_global_trie_for_answer(gt_node_ptr current_node, char *str, int *str_index, int *arity, int *mode);
#endif /* GLOBAL_TRIE */
/* ----------------------- **
** Local inlines **
** ----------------------- */
#ifdef GLOBAL_TRIE
STD_PROTO(static inline gt_node_ptr global_trie_node_check_insert, (gt_node_ptr, Term));
STD_PROTO(static inline sg_node_ptr subgoal_trie_node_check_insert, (tab_ent_ptr, sg_node_ptr, gt_node_ptr));
STD_PROTO(static inline ans_node_ptr answer_trie_node_check_insert, (sg_fr_ptr, ans_node_ptr, gt_node_ptr, int));
#else
STD_PROTO(static inline sg_node_ptr subgoal_trie_node_check_insert, (tab_ent_ptr, sg_node_ptr, Term));
STD_PROTO(static inline ans_node_ptr answer_trie_node_check_insert, (sg_fr_ptr, ans_node_ptr, Term, int));
#endif /* GLOBAL_TRIE */
#if defined(TABLE_LOCK_AT_WRITE_LEVEL)
#define LOCK_NODE(NODE) LOCK_TABLE(NODE)
#define UNLOCK_NODE(NODE) UNLOCK_TABLE(NODE)
#elif defined(TABLE_LOCK_AT_NODE_LEVEL)
#define LOCK_NODE(NODE) TRIE_LOCK(TrNode_lock(NODE))
#define UNLOCK_NODE(NODE) UNLOCK(TrNode_lock(NODE))
#else
#define LOCK_NODE(NODE)
#define UNLOCK_NODE(NODE)
#endif /* TABLE_LOCK_LEVEL */
#ifdef GLOBAL_TRIE
#define SUBGOAL_TOKEN_CHECK_INSERT(TAB_ENT, NODE, TOKEN) \
NODE = global_trie_node_check_insert(NODE, TOKEN)
#define ANSWER_TOKEN_CHECK_INSERT(SG_FR, NODE, TOKEN, INSTR) \
NODE = global_trie_node_check_insert(NODE, TOKEN)
#else
#define SUBGOAL_TOKEN_CHECK_INSERT(TAB_ENT, NODE, TOKEN) \
NODE = subgoal_trie_node_check_insert(TAB_ENT, NODE, TOKEN)
#define ANSWER_TOKEN_CHECK_INSERT(SG_FR, NODE, TOKEN, INSTR) \
NODE = answer_trie_node_check_insert(SG_FR, NODE, TOKEN, INSTR)
#endif /* GLOBAL_TRIE */
#ifdef TABLE_LOCK_AT_WRITE_LEVEL
static inline
sg_node_ptr subgoal_trie_node_check_insert(tab_ent_ptr tab_ent, sg_node_ptr parent_node, Term t) {
sg_node_ptr child_node;
sg_hash_ptr hash;
child_node = TrNode_child(parent_node);
if (child_node == NULL) {
#ifdef ALLOC_BEFORE_CHECK
new_subgoal_trie_node(child_node, t, NULL, parent_node, NULL);
#endif /* ALLOC_BEFORE_CHECK */
LOCK_NODE(parent_node);
if (TrNode_child(parent_node)) {
sg_node_ptr chain_node = TrNode_child(parent_node);
if (IS_SUBGOAL_TRIE_HASH(chain_node)) {
#ifdef ALLOC_BEFORE_CHECK
FREE_SUBGOAL_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
hash = (sg_hash_ptr) chain_node;
goto subgoal_trie_hash;
}
do {
if (TrNode_entry(chain_node) == t) {
#ifdef ALLOC_BEFORE_CHECK
FREE_SUBGOAL_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
return chain_node;
}
chain_node = TrNode_next(chain_node);
} while (chain_node);
#ifdef ALLOC_BEFORE_CHECK
TrNode_next(child_node) = TrNode_child(parent_node);
#else
new_subgoal_trie_node(child_node, t, NULL, parent_node, TrNode_child(parent_node));
} else {
new_subgoal_trie_node(child_node, t, NULL, parent_node, NULL);
#endif /* ALLOC_BEFORE_CHECK */
}
TrNode_child(parent_node) = child_node;
UNLOCK_NODE(parent_node);
return child_node;
}
if (! IS_SUBGOAL_TRIE_HASH(child_node)) {
sg_node_ptr first_node = child_node;
int count_nodes = 0;
do {
if (TrNode_entry(child_node) == t) {
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
} while (child_node);
#ifdef ALLOC_BEFORE_CHECK
new_subgoal_trie_node(child_node, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
LOCK_NODE(parent_node);
if (first_node != TrNode_child(parent_node)) {
sg_node_ptr chain_node = TrNode_child(parent_node);
if (IS_SUBGOAL_TRIE_HASH(chain_node)) {
#ifdef ALLOC_BEFORE_CHECK
FREE_SUBGOAL_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
hash = (sg_hash_ptr) chain_node;
goto subgoal_trie_hash;
}
do {
if (TrNode_entry(chain_node) == t) {
#ifdef ALLOC_BEFORE_CHECK
FREE_SUBGOAL_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
return chain_node;
}
count_nodes++;
chain_node = TrNode_next(chain_node);
} while (chain_node != first_node);
#ifdef ALLOC_BEFORE_CHECK
TrNode_next(child_node) = TrNode_child(parent_node);
#else
new_subgoal_trie_node(child_node, t, NULL, parent_node, TrNode_child(parent_node));
} else {
new_subgoal_trie_node(child_node, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
}
count_nodes++;
if (count_nodes >= MAX_NODES_PER_TRIE_LEVEL) {
/* alloc a new hash */
sg_node_ptr chain_node, next_node, *bucket;
new_subgoal_trie_hash(hash, count_nodes, tab_ent);
chain_node = child_node;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), BASE_HASH_BUCKETS - 1));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
TrNode_child(parent_node) = (sg_node_ptr) hash;
} else {
TrNode_child(parent_node) = child_node;
}
UNLOCK_NODE(parent_node);
return child_node;
}
hash = (sg_hash_ptr) child_node;
subgoal_trie_hash:
{ /* trie nodes with hashing */
sg_node_ptr *bucket, first_node;
int seed, count_nodes = 0;
seed = Hash_seed(hash);
bucket = Hash_bucket(hash, HASH_ENTRY(t, seed));
first_node = child_node = *bucket;
while (child_node) {
if (TrNode_entry(child_node) == t) {
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
}
#ifdef ALLOC_BEFORE_CHECK
new_subgoal_trie_node(child_node, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
LOCK_NODE(parent_node);
if (seed != Hash_seed(hash)) {
/* the hash has been expanded */
#ifdef ALLOC_BEFORE_CHECK
FREE_SUBGOAL_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
goto subgoal_trie_hash;
}
if (first_node != *bucket) {
sg_node_ptr chain_node = *bucket;
do {
if (TrNode_entry(chain_node) == t) {
#ifdef ALLOC_BEFORE_CHECK
FREE_SUBGOAL_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
return chain_node;
}
count_nodes++;
chain_node = TrNode_next(chain_node);
} while (chain_node != first_node);
#ifdef ALLOC_BEFORE_CHECK
TrNode_next(child_node) = *bucket;
#else
new_subgoal_trie_node(child_node, t, NULL, parent_node, *bucket);
} else {
new_subgoal_trie_node(child_node, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
}
*bucket = child_node;
Hash_num_nodes(hash)++;
count_nodes++;
if (count_nodes >= MAX_NODES_PER_BUCKET && Hash_num_nodes(hash) > Hash_num_buckets(hash)) {
/* expand current hash */
sg_node_ptr chain_node, next_node, *first_old_bucket, *old_bucket;
first_old_bucket = Hash_buckets(hash);
old_bucket = first_old_bucket + Hash_num_buckets(hash);
Hash_num_buckets(hash) *= 2;
ALLOC_HASH_BUCKETS(Hash_buckets(hash), Hash_num_buckets(hash));
seed = Hash_seed(hash);
do {
if (*--old_bucket) {
chain_node = *old_bucket;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), seed));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
}
} while (old_bucket != first_old_bucket);
FREE_HASH_BUCKETS(first_old_bucket);
}
UNLOCK_NODE(parent_node);
return child_node;
}
}
static inline
ans_node_ptr answer_trie_node_check_insert(sg_fr_ptr sg_fr, ans_node_ptr parent_node, Term t, int instr) {
ans_node_ptr child_node;
ans_hash_ptr hash;
#ifdef TABLING_ERRORS
if (IS_ANSWER_LEAF_NODE(parent_node))
TABLING_ERROR_MESSAGE("IS_ANSWER_LEAF_NODE(parent_node) (answer_trie_node_check_insert)");
#endif /* TABLING_ERRORS */
child_node = TrNode_child(parent_node);
if (child_node == NULL) {
#ifdef ALLOC_BEFORE_CHECK
new_answer_trie_node(child_node, instr, t, NULL, parent_node, NULL);
#endif /* ALLOC_BEFORE_CHECK */
LOCK_NODE(parent_node);
if (TrNode_child(parent_node)) {
ans_node_ptr chain_node = TrNode_child(parent_node);
if (IS_ANSWER_TRIE_HASH(chain_node)) {
#ifdef ALLOC_BEFORE_CHECK
FREE_ANSWER_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
hash = (ans_hash_ptr) chain_node;
goto answer_trie_hash;
}
do {
if (TrNode_entry(chain_node) == t) {
#ifdef ALLOC_BEFORE_CHECK
FREE_ANSWER_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
return chain_node;
}
chain_node = TrNode_next(chain_node);
} while (chain_node);
#ifdef ALLOC_BEFORE_CHECK
TrNode_next(child_node) = TrNode_child(parent_node);
#else
new_answer_trie_node(child_node, instr, t, NULL, parent_node, TrNode_child(parent_node));
} else {
new_answer_trie_node(child_node, instr, t, NULL, parent_node, NULL);
#endif /* ALLOC_BEFORE_CHECK */
}
TrNode_child(parent_node) = child_node;
UNLOCK_NODE(parent_node);
return child_node;
}
if (! IS_ANSWER_TRIE_HASH(child_node)) {
ans_node_ptr first_node = child_node;
int count_nodes = 0;
do {
if (TrNode_entry(child_node) == t) {
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
} while (child_node);
#ifdef ALLOC_BEFORE_CHECK
new_answer_trie_node(child_node, instr, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
LOCK_NODE(parent_node);
if (first_node != TrNode_child(parent_node)) {
ans_node_ptr chain_node = TrNode_child(parent_node);
if (IS_ANSWER_TRIE_HASH(chain_node)) {
#ifdef ALLOC_BEFORE_CHECK
FREE_ANSWER_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
hash = (ans_hash_ptr) chain_node;
goto answer_trie_hash;
}
do {
if (TrNode_entry(chain_node) == t) {
#ifdef ALLOC_BEFORE_CHECK
FREE_ANSWER_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
return chain_node;
}
count_nodes++;
chain_node = TrNode_next(chain_node);
} while (chain_node != first_node);
#ifdef ALLOC_BEFORE_CHECK
TrNode_next(child_node) = TrNode_child(parent_node);
#else
new_answer_trie_node(child_node, instr, t, NULL, parent_node, TrNode_child(parent_node));
} else {
new_answer_trie_node(child_node, instr, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
}
count_nodes++;
if (count_nodes >= MAX_NODES_PER_TRIE_LEVEL) {
/* alloc a new hash */
ans_node_ptr chain_node, next_node, *bucket;
new_answer_trie_hash(hash, count_nodes, sg_fr);
chain_node = child_node;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), BASE_HASH_BUCKETS - 1));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
TrNode_child(parent_node) = (ans_node_ptr) hash;
} else {
TrNode_child(parent_node) = child_node;
}
UNLOCK_NODE(parent_node);
return child_node;
}
hash = (ans_hash_ptr) child_node;
answer_trie_hash:
{ /* trie nodes with hashing */
ans_node_ptr *bucket, first_node;
int seed, count_nodes = 0;
seed = Hash_seed(hash);
bucket = Hash_bucket(hash, HASH_ENTRY(t, seed));
first_node = child_node = *bucket;
while (child_node) {
if (TrNode_entry(child_node) == t) {
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
}
#ifdef ALLOC_BEFORE_CHECK
new_answer_trie_node(child_node, instr, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
LOCK_NODE(parent_node);
if (seed != Hash_seed(hash)) {
/* the hash has been expanded */
#ifdef ALLOC_BEFORE_CHECK
FREE_ANSWER_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
goto answer_trie_hash;
}
if (first_node != *bucket) {
ans_node_ptr chain_node = *bucket;
do {
if (TrNode_entry(chain_node) == t) {
#ifdef ALLOC_BEFORE_CHECK
FREE_ANSWER_TRIE_NODE(child_node);
#endif /* ALLOC_BEFORE_CHECK */
UNLOCK_NODE(parent_node);
return chain_node;
}
count_nodes++;
chain_node = TrNode_next(chain_node);
} while (chain_node != first_node);
#ifdef ALLOC_BEFORE_CHECK
TrNode_next(child_node) = *bucket;
#else
new_answer_trie_node(child_node, instr, t, NULL, parent_node, *bucket);
} else {
new_answer_trie_node(child_node, instr, t, NULL, parent_node, first_node);
#endif /* ALLOC_BEFORE_CHECK */
}
*bucket = child_node;
Hash_num_nodes(hash)++;
count_nodes++;
if (count_nodes >= MAX_NODES_PER_BUCKET && Hash_num_nodes(hash) > Hash_num_buckets(hash)) {
/* expand current hash */
ans_node_ptr chain_node, next_node, *first_old_bucket, *old_bucket;
first_old_bucket = Hash_buckets(hash);
old_bucket = first_old_bucket + Hash_num_buckets(hash);
Hash_num_buckets(hash) *= 2;
ALLOC_HASH_BUCKETS(Hash_buckets(hash), Hash_num_buckets(hash));
seed = Hash_seed(hash);
do {
if (*--old_bucket) {
chain_node = *old_bucket;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), seed));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
}
} while (old_bucket != first_old_bucket);
FREE_HASH_BUCKETS(first_old_bucket);
}
UNLOCK_NODE(parent_node);
return child_node;
}
}
#else /* TABLE_LOCK_AT_ENTRY_LEVEL || TABLE_LOCK_AT_NODE_LEVEL || ! YAPOR */
#ifdef GLOBAL_TRIE
static inline
gt_node_ptr global_trie_node_check_insert(gt_node_ptr parent_node, Term t) {
gt_node_ptr child_node;
LOCK_NODE(parent_node);
child_node = TrNode_child(parent_node);
if (child_node == NULL) {
new_global_trie_node(child_node, t, NULL, parent_node, NULL);
TrNode_child(parent_node) = child_node;
UNLOCK_NODE(parent_node);
return child_node;
}
if (! IS_GLOBAL_TRIE_HASH(child_node)) {
int count_nodes = 0;
do {
if (TrNode_entry(child_node) == t) {
UNLOCK_NODE(parent_node);
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
} while (child_node);
new_global_trie_node(child_node, t, NULL, parent_node, TrNode_child(parent_node));
count_nodes++;
if (count_nodes >= MAX_NODES_PER_TRIE_LEVEL) {
/* alloc a new hash */
gt_hash_ptr hash;
gt_node_ptr chain_node, next_node, *bucket;
new_global_trie_hash(hash, count_nodes);
chain_node = child_node;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), BASE_HASH_BUCKETS - 1));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
TrNode_child(parent_node) = (gt_node_ptr) hash;
} else {
TrNode_child(parent_node) = child_node;
}
UNLOCK_NODE(parent_node);
return child_node;
}
{ /* trie nodes with hashing */
gt_hash_ptr hash;
gt_node_ptr *bucket;
int count_nodes = 0;
hash = (gt_hash_ptr) child_node;
bucket = Hash_bucket(hash, HASH_ENTRY(t, Hash_seed(hash)));
child_node = *bucket;
while (child_node) {
if (TrNode_entry(child_node) == t) {
UNLOCK_NODE(parent_node);
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
}
new_global_trie_node(child_node, t, NULL, parent_node, *bucket);
*bucket = child_node;
Hash_num_nodes(hash)++;
count_nodes++;
if (count_nodes >= MAX_NODES_PER_BUCKET && Hash_num_nodes(hash) > Hash_num_buckets(hash)) {
/* expand current hash */
gt_node_ptr chain_node, next_node, *first_old_bucket, *old_bucket;
int seed;
first_old_bucket = Hash_buckets(hash);
old_bucket = first_old_bucket + Hash_num_buckets(hash);
Hash_num_buckets(hash) *= 2;
ALLOC_HASH_BUCKETS(Hash_buckets(hash), Hash_num_buckets(hash));
seed = Hash_seed(hash);
do {
if (*--old_bucket) {
chain_node = *old_bucket;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), seed));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
}
} while (old_bucket != first_old_bucket);
FREE_HASH_BUCKETS(first_old_bucket);
}
UNLOCK_NODE(parent_node);
return child_node;
}
}
#endif /* GLOBAL_TRIE */
static inline
#ifdef GLOBAL_TRIE
sg_node_ptr subgoal_trie_node_check_insert(tab_ent_ptr tab_ent, sg_node_ptr parent_node, gt_node_ptr t) {
#else
sg_node_ptr subgoal_trie_node_check_insert(tab_ent_ptr tab_ent, sg_node_ptr parent_node, Term t) {
#endif /* GLOBAL_TRIE */
sg_node_ptr child_node;
LOCK_NODE(parent_node);
child_node = TrNode_child(parent_node);
if (child_node == NULL) {
new_subgoal_trie_node(child_node, t, NULL, parent_node, NULL);
TrNode_child(parent_node) = child_node;
UNLOCK_NODE(parent_node);
return child_node;
}
if (! IS_SUBGOAL_TRIE_HASH(child_node)) {
int count_nodes = 0;
do {
if (TrNode_entry(child_node) == t) {
UNLOCK_NODE(parent_node);
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
} while (child_node);
new_subgoal_trie_node(child_node, t, NULL, parent_node, TrNode_child(parent_node));
count_nodes++;
if (count_nodes >= MAX_NODES_PER_TRIE_LEVEL) {
/* alloc a new hash */
sg_hash_ptr hash;
sg_node_ptr chain_node, next_node, *bucket;
new_subgoal_trie_hash(hash, count_nodes, tab_ent);
chain_node = child_node;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), BASE_HASH_BUCKETS - 1));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
TrNode_child(parent_node) = (sg_node_ptr) hash;
} else {
TrNode_child(parent_node) = child_node;
}
UNLOCK_NODE(parent_node);
return child_node;
}
{ /* trie nodes with hashing */
sg_hash_ptr hash;
sg_node_ptr *bucket;
int count_nodes = 0;
hash = (sg_hash_ptr) child_node;
bucket = Hash_bucket(hash, HASH_ENTRY(t, Hash_seed(hash)));
child_node = *bucket;
while (child_node) {
if (TrNode_entry(child_node) == t) {
UNLOCK_NODE(parent_node);
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
}
new_subgoal_trie_node(child_node, t, NULL, parent_node, *bucket);
*bucket = child_node;
Hash_num_nodes(hash)++;
count_nodes++;
if (count_nodes >= MAX_NODES_PER_BUCKET && Hash_num_nodes(hash) > Hash_num_buckets(hash)) {
/* expand current hash */
sg_node_ptr chain_node, next_node, *first_old_bucket, *old_bucket;
int seed;
first_old_bucket = Hash_buckets(hash);
old_bucket = first_old_bucket + Hash_num_buckets(hash);
Hash_num_buckets(hash) *= 2;
ALLOC_HASH_BUCKETS(Hash_buckets(hash), Hash_num_buckets(hash));
seed = Hash_seed(hash);
do {
if (*--old_bucket) {
chain_node = *old_bucket;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), seed));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
}
} while (old_bucket != first_old_bucket);
FREE_HASH_BUCKETS(first_old_bucket);
}
UNLOCK_NODE(parent_node);
return child_node;
}
}
static inline
#ifdef GLOBAL_TRIE
ans_node_ptr answer_trie_node_check_insert(sg_fr_ptr sg_fr, ans_node_ptr parent_node, gt_node_ptr t, int instr) {
#else
ans_node_ptr answer_trie_node_check_insert(sg_fr_ptr sg_fr, ans_node_ptr parent_node, Term t, int instr) {
#endif /* GLOBAL_TRIE */
ans_node_ptr child_node;
#ifdef TABLING_ERRORS
if (IS_ANSWER_LEAF_NODE(parent_node))
TABLING_ERROR_MESSAGE("IS_ANSWER_LEAF_NODE(parent_node) (answer_trie_node_check_insert)");
#endif /* TABLING_ERRORS */
LOCK_NODE(parent_node);
child_node = TrNode_child(parent_node);
if (child_node == NULL) {
new_answer_trie_node(child_node, instr, t, NULL, parent_node, NULL);
TrNode_child(parent_node) = child_node;
UNLOCK_NODE(parent_node);
return child_node;
}
if (! IS_ANSWER_TRIE_HASH(child_node)) {
int count_nodes = 0;
do {
if (TrNode_entry(child_node) == t) {
UNLOCK_NODE(parent_node);
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
} while (child_node);
new_answer_trie_node(child_node, instr, t, NULL, parent_node, TrNode_child(parent_node));
count_nodes++;
if (count_nodes >= MAX_NODES_PER_TRIE_LEVEL) {
/* alloc a new hash */
ans_hash_ptr hash;
ans_node_ptr chain_node, next_node, *bucket;
new_answer_trie_hash(hash, count_nodes, sg_fr);
chain_node = child_node;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), BASE_HASH_BUCKETS - 1));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
TrNode_child(parent_node) = (ans_node_ptr) hash;
} else {
TrNode_child(parent_node) = child_node;
}
UNLOCK_NODE(parent_node);
return child_node;
}
{ /* trie nodes with hashing */
ans_hash_ptr hash;
ans_node_ptr *bucket;
int count_nodes = 0;
hash = (ans_hash_ptr) child_node;
bucket = Hash_bucket(hash, HASH_ENTRY(t, Hash_seed(hash)));
child_node = *bucket;
while (child_node) {
if (TrNode_entry(child_node) == t) {
UNLOCK_NODE(parent_node);
return child_node;
}
count_nodes++;
child_node = TrNode_next(child_node);
}
new_answer_trie_node(child_node, instr, t, NULL, parent_node, *bucket);
*bucket = child_node;
Hash_num_nodes(hash)++;
count_nodes++;
if (count_nodes >= MAX_NODES_PER_BUCKET && Hash_num_nodes(hash) > Hash_num_buckets(hash)) {
/* expand current hash */
ans_node_ptr chain_node, next_node, *first_old_bucket, *old_bucket;
int seed;
first_old_bucket = Hash_buckets(hash);
old_bucket = first_old_bucket + Hash_num_buckets(hash);
Hash_num_buckets(hash) *= 2;
ALLOC_HASH_BUCKETS(Hash_buckets(hash), Hash_num_buckets(hash));
seed = Hash_seed(hash);
do {
if (*--old_bucket) {
chain_node = *old_bucket;
do {
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(chain_node), seed));
next_node = TrNode_next(chain_node);
TrNode_next(chain_node) = *bucket;
*bucket = chain_node;
chain_node = next_node;
} while (chain_node);
}
} while (old_bucket != first_old_bucket);
FREE_HASH_BUCKETS(first_old_bucket);
}
UNLOCK_NODE(parent_node);
return child_node;
}
}
#endif /* TABLE_LOCK_LEVEL */
/* -------------------------- **
** Global functions **
** -------------------------- */
sg_fr_ptr subgoal_search(yamop *preg, CELL **Yaddr) {
int i, j, count_vars, arity;
CELL *stack_vars, *stack_terms_limit, *stack_terms_base, *stack_terms;
tab_ent_ptr tab_ent;
sg_fr_ptr sg_fr;
#ifdef GLOBAL_TRIE
gt_node_ptr current_node;
sg_node_ptr current_sg_node;
#else
sg_node_ptr current_node;
#define current_sg_node current_node
#endif /* GLOBAL_TRIE */
arity = preg->u.Otapl.s;
tab_ent = preg->u.Otapl.te;
count_vars = 0;
stack_vars = *Yaddr;
stack_terms_limit = (CELL *)TR;
stack_terms_base = stack_terms = (CELL *)Yap_TrailTop;
current_sg_node = TabEnt_subgoal_trie(tab_ent);
#ifdef TABLE_LOCK_AT_ENTRY_LEVEL
LOCK(TabEnt_lock(tab_ent));
#endif /* TABLE_LOCK_LEVEL */
for (i = 1; i <= arity; i++) {
#ifdef GLOBAL_TRIE
current_node = GLOBAL_root_gt;
#endif /* GLOBAL_TRIE */
STACK_CHECK_EXPAND(stack_terms, stack_terms_limit, stack_terms_base);
STACK_PUSH_UP(Deref(XREGS[i]), stack_terms);
do {
Term t = STACK_POP_DOWN(stack_terms);
if (IsVarTerm(t)) {
if (IsTableVarTerm(t)) {
t = MakeTableVarTerm(VarIndexOfTerm(t));
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, t);
} else {
if (count_vars == MAX_TABLE_VARS)
Yap_Error(INTERNAL_ERROR, TermNil, "MAX_TABLE_VARS exceeded (subgoal_search)");
STACK_PUSH_UP(t, stack_vars);
*((CELL *)t) = GLOBAL_table_var_enumerator(count_vars);
t = MakeTableVarTerm(count_vars);
count_vars++;
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, t);
}
} else if (IsAtomOrIntTerm(t)) {
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, t);
} else if (IsPairTerm(t)) {
#ifdef TRIE_COMPACT_PAIRS
CELL *aux = RepPair(t);
if (aux == PairTermMark) {
t = STACK_POP_DOWN(stack_terms);
if (IsPairTerm(t)) {
aux = RepPair(t);
t = Deref(*(aux + 1));
if (t == TermNil) {
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, CompactPairEndList);
} else {
/* STACK_CHECK_EXPAND(stack_terms, stack_terms_limit + 2, stack_terms_base); */
/* STACK_CHECK_EXPAND is not necessary here because the situation of pushing **
** up 3 terms has already initially checked for the CompactPairInit term */
STACK_PUSH_UP(t, stack_terms);
STACK_PUSH_UP(AbsPair(PairTermMark), stack_terms);
}
STACK_PUSH_UP(Deref(*aux), stack_terms);
} else {
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, CompactPairEndTerm);
STACK_PUSH_UP(t, stack_terms);
}
} else {
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, CompactPairInit);
t = Deref(*(aux + 1));
if (t == TermNil) {
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, CompactPairEndList);
} else {
STACK_CHECK_EXPAND(stack_terms, stack_terms_limit + 2, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
STACK_PUSH_UP(AbsPair(PairTermMark), stack_terms);
}
STACK_PUSH_UP(Deref(*aux), stack_terms);
}
#else
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, AbsPair(NULL));
STACK_CHECK_EXPAND(stack_terms, stack_terms_limit + 1, stack_terms_base);
STACK_PUSH_UP(Deref(*(RepPair(t) + 1)), stack_terms);
STACK_PUSH_UP(Deref(*(RepPair(t))), stack_terms);
#endif /* TRIE_COMPACT_PAIRS */
} else if (IsApplTerm(t)) {
Functor f = FunctorOfTerm(t);
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, AbsAppl((Term *)f));
if (f == FunctorDouble) {
volatile Float dbl = FloatOfTerm(t);
volatile Term *t_dbl = (Term *)((void *) &dbl);
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, *(t_dbl + 1));
#endif /* SIZEOF_DOUBLE x SIZEOF_INT_P */
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, *t_dbl);
#ifdef GLOBAL_TRIE
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, AbsAppl((Term *)f));
#endif /* GLOBAL_TRIE */
} else if (f == FunctorLongInt) {
Int li = LongIntOfTerm(t);
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, li);
#ifdef GLOBAL_TRIE
SUBGOAL_TOKEN_CHECK_INSERT(tab_ent, current_node, AbsAppl((Term *)f));
#endif /* GLOBAL_TRIE */
} else if (f == FunctorDBRef) {
Yap_Error(INTERNAL_ERROR, TermNil, "unsupported type tag (FunctorDBRef in subgoal_search)");
} else if (f == FunctorBigInt) {
Yap_Error(INTERNAL_ERROR, TermNil, "unsupported type tag (FunctorBigInt in subgoal_search)");
} else {
STACK_CHECK_EXPAND(stack_terms, stack_terms_limit + ArityOfFunctor(f) - 1, stack_terms_base);
for (j = ArityOfFunctor(f); j >= 1; j--)
STACK_PUSH_UP(Deref(*(RepAppl(t) + j)), stack_terms);
}
} else {
Yap_Error(INTERNAL_ERROR, TermNil, "unknown type tag (subgoal_search)");
}
} while (STACK_NOT_EMPTY(stack_terms, stack_terms_base));
#ifdef GLOBAL_TRIE
current_sg_node = subgoal_trie_node_check_insert(tab_ent, current_sg_node, current_node);
#endif /* GLOBAL_TRIE */
}
#if defined(TABLE_LOCK_AT_NODE_LEVEL)
LOCK(TrNode_lock(current_sg_node));
#elif defined(TABLE_LOCK_AT_WRITE_LEVEL)
LOCK_TABLE(current_sg_node);
#endif /* TABLE_LOCK_LEVEL */
if (TrNode_sg_fr(current_sg_node) == NULL) {
/* new tabled subgoal */
new_subgoal_frame(sg_fr, preg);
TrNode_sg_fr(current_sg_node) = (sg_node_ptr) sg_fr;
} else {
sg_fr = (sg_fr_ptr) TrNode_sg_fr(current_sg_node);
#ifdef LIMIT_TABLING
if (SgFr_state(sg_fr) <= ready) { /* incomplete or ready */
remove_from_global_sg_fr_list(sg_fr);
}
#endif /* LIMIT_TABLING */
}
#if defined(TABLE_LOCK_AT_ENTRY_LEVEL)
UNLOCK(TabEnt_lock(tab_ent));
#elif defined(TABLE_LOCK_AT_NODE_LEVEL)
UNLOCK(TrNode_lock(current_sg_node));
#elif defined(TABLE_LOCK_AT_WRITE_LEVEL)
UNLOCK_TABLE(current_sg_node);
#endif /* TABLE_LOCK_LEVEL */
STACK_PUSH_UP(count_vars, stack_vars);
*Yaddr = stack_vars++;
/* reset variables */
while (count_vars--) {
Term t = STACK_POP_DOWN(stack_vars);
RESET_VARIABLE(t);
}
return sg_fr;
#ifndef GLOBAL_TRIE
#undef current_sg_node
#endif /* GLOBAL_TRIE */
}
ans_node_ptr answer_search(sg_fr_ptr sg_fr, CELL *subs_ptr) {
int i, j, count_vars, subs_arity;
CELL *stack_vars, *stack_terms_base, *stack_terms;
#ifdef GLOBAL_TRIE
gt_node_ptr current_node;
ans_node_ptr current_ans_node;
#else
ans_node_ptr current_node;
#define current_ans_node current_node
#endif /* GLOBAL_TRIE */
#ifdef TRIE_COMPACT_PAIRS
int in_new_pair = 0;
#else
#define in_new_pair 0
#endif /* TRIE_COMPACT_PAIRS */
count_vars = 0;
subs_arity = *subs_ptr;
stack_vars = (CELL *)TR;
stack_terms_base = stack_terms = (CELL *)Yap_TrailTop;
current_ans_node = SgFr_answer_trie(sg_fr);
for (i = subs_arity; i >= 1; i--) {
#ifdef GLOBAL_TRIE
current_node = GLOBAL_root_gt;
#endif /* GLOBAL_TRIE */
#ifdef TABLING_ERRORS
if (IsNonVarTerm(*(subs_ptr + i)))
TABLING_ERROR_MESSAGE("IsNonVarTem(*(subs_ptr + i)) (answer_search)");
#endif /* TABLING_ERRORS */
STACK_CHECK_EXPAND(stack_terms, stack_vars, stack_terms_base);
STACK_PUSH_UP(Deref(*(subs_ptr + i)), stack_terms);
do {
Term t = STACK_POP_DOWN(stack_terms);
if (IsVarTerm(t)) {
t = Deref(t);
if (IsTableVarTerm(t)) {
t = MakeTableVarTerm(VarIndexOfTerm(t));
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, t, _trie_retry_val + in_new_pair);
} else {
if (count_vars == MAX_TABLE_VARS)
Yap_Error(INTERNAL_ERROR, TermNil, "MAX_TABLE_VARS exceeded (answer_search)");
STACK_PUSH_DOWN(t, stack_vars);
*((CELL *)t) = GLOBAL_table_var_enumerator(count_vars);
t = MakeTableVarTerm(count_vars);
count_vars++;
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, t, _trie_retry_var + in_new_pair);
}
#ifdef TRIE_COMPACT_PAIRS
in_new_pair = 0;
#endif /* TRIE_COMPACT_PAIRS */
} else if (IsAtomOrIntTerm(t)) {
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, t, _trie_retry_atom + in_new_pair);
#ifdef TRIE_COMPACT_PAIRS
in_new_pair = 0;
#endif /* TRIE_COMPACT_PAIRS */
} else if (IsPairTerm(t)) {
#ifdef TRIE_COMPACT_PAIRS
CELL *aux = RepPair(t);
if (aux == PairTermMark) {
t = STACK_POP_DOWN(stack_terms);
if (IsPairTerm(t)) {
aux = RepPair(t);
t = Deref(*(aux + 1));
if (t == TermNil) {
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, CompactPairEndList, _trie_retry_pair);
} else {
/* STACK_CHECK_EXPAND(stack_terms, stack_vars + 2, stack_terms_base); */
/* STACK_CHECK_EXPAND is not necessary here because the situation of pushing **
** up 3 terms has already initially checked for the CompactPairInit term */
STACK_PUSH_UP(t, stack_terms);
STACK_PUSH_UP(AbsPair(PairTermMark), stack_terms);
in_new_pair = 4;
}
STACK_PUSH_UP(Deref(*aux), stack_terms);
} else {
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, CompactPairEndTerm, _trie_retry_null);
STACK_PUSH_UP(t, stack_terms);
}
} else {
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, CompactPairInit, _trie_retry_null + in_new_pair);
t = Deref(*(aux + 1));
if (t == TermNil) {
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, CompactPairEndList, _trie_retry_pair);
in_new_pair = 0;
} else {
STACK_CHECK_EXPAND(stack_terms, stack_vars + 2, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
STACK_PUSH_UP(AbsPair(PairTermMark), stack_terms);
in_new_pair = 4;
}
STACK_PUSH_UP(Deref(*aux), stack_terms);
}
#else
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, AbsPair(NULL), _trie_retry_pair);
STACK_CHECK_EXPAND(stack_terms, stack_vars + 1, stack_terms_base);
STACK_PUSH_UP(Deref(*(RepPair(t) + 1)), stack_terms);
STACK_PUSH_UP(Deref(*(RepPair(t))), stack_terms);
#endif /* TRIE_COMPACT_PAIRS */
} else if (IsApplTerm(t)) {
Functor f = FunctorOfTerm(t);
if (f == FunctorDouble) {
volatile Float dbl = FloatOfTerm(t);
volatile Term *t_dbl = (Term *)((void *) &dbl);
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, AbsAppl((Term *)f), _trie_retry_null + in_new_pair);
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, *(t_dbl + 1), _trie_retry_extension);
#endif /* SIZEOF_DOUBLE x SIZEOF_INT_P */
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, *t_dbl, _trie_retry_extension);
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, AbsAppl((Term *)f), _trie_retry_float);
} else if (f == FunctorLongInt) {
Int li = LongIntOfTerm (t);
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, AbsAppl((Term *)f), _trie_retry_null + in_new_pair);
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, li, _trie_retry_extension);
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, AbsAppl((Term *)f), _trie_retry_long);
} else if (f == FunctorDBRef) {
Yap_Error(INTERNAL_ERROR, TermNil, "unsupported type tag (FunctorDBRef in answer_search)");
} else if (f == FunctorBigInt) {
Yap_Error(INTERNAL_ERROR, TermNil, "unsupported type tag (FunctorBigInt in answer_search)");
} else {
ANSWER_TOKEN_CHECK_INSERT(sg_fr, current_node, AbsAppl((Term *)f), _trie_retry_struct + in_new_pair);
STACK_CHECK_EXPAND(stack_terms, stack_vars + ArityOfFunctor(f) - 1, stack_terms_base);
for (j = ArityOfFunctor(f); j >= 1; j--)
STACK_PUSH_UP(Deref(*(RepAppl(t) + j)), stack_terms);
}
#ifdef TRIE_COMPACT_PAIRS
in_new_pair = 0;
#endif /* TRIE_COMPACT_PAIRS */
} else {
Yap_Error(INTERNAL_ERROR, TermNil, "unknown type tag (answer_search)");
}
} while (STACK_NOT_EMPTY(stack_terms, stack_terms_base));
#ifdef GLOBAL_TRIE
current_ans_node = answer_trie_node_check_insert(sg_fr, current_ans_node, current_node, _trie_retry_atom);
#endif /* GLOBAL_TRIE */
}
/* reset variables */
while (count_vars--) {
Term t = STACK_POP_UP(stack_vars);
RESET_VARIABLE(t);
}
return current_ans_node;
#ifndef GLOBAL_TRIE
#undef current_ans_node
#endif /* GLOBAL_TRIE */
#ifndef TRIE_COMPACT_PAIRS
#undef in_new_pair
#endif /* TRIE_COMPACT_PAIRS */
}
void load_answer(ans_node_ptr current_ans_node, CELL *subs_ptr) {
CELL *stack_vars_base, *stack_vars, *stack_terms_base, *stack_terms;
int i, subs_arity, vars_arity = 0;
Term t;
#ifdef GLOBAL_TRIE
gt_node_ptr current_node;
#else
#define current_node current_ans_node
#endif /* GLOBAL_TRIE */
#ifdef TRIE_COMPACT_PAIRS
int stack_terms_pair_offset = 0;
#endif /* TRIE_COMPACT_PAIRS */
if ((subs_arity = *subs_ptr) == 0)
return;
#ifdef TABLING_ERRORS
if (H < H_FZ)
TABLING_ERROR_MESSAGE("H < H_FZ (load_answer)");
#endif /* TABLING_ERRORS */
stack_vars_base = stack_vars = (CELL *)TR;
stack_terms_base = stack_terms = (CELL *)Yap_TrailTop;
#ifdef GLOBAL_TRIE
for (i = subs_arity; i >= 1; i--) {
current_node = TrNode_entry(current_ans_node);
current_ans_node = UNTAG_ANSWER_LEAF_NODE(TrNode_parent(current_ans_node));
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
#else
{
t = TrNode_entry(current_node);
current_node = UNTAG_ANSWER_LEAF_NODE(TrNode_parent(current_node));
#endif /* GLOBAL_TRIE */
do {
if (IsVarTerm(t)) {
int var_index = VarIndexOfTableTerm(t);
STACK_CHECK_EXPAND(stack_terms, stack_vars_base + var_index + 1, stack_terms_base);
if (var_index >= vars_arity) {
while (vars_arity < var_index)
stack_vars_base[vars_arity++] = 0;
stack_vars_base[vars_arity++] = MkVarTerm();
stack_vars = stack_vars_base + vars_arity;
} else if (stack_vars_base[var_index] == 0)
stack_vars_base[var_index] = MkVarTerm();
STACK_PUSH_UP(stack_vars_base[var_index], stack_terms);
} else if (IsAtomOrIntTerm(t)) {
STACK_CHECK_EXPAND(stack_terms, stack_vars, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else if (IsPairTerm(t)) {
#ifdef TRIE_COMPACT_PAIRS
if (t == CompactPairInit) {
Term *stack_aux = stack_terms_base - stack_terms_pair_offset;
Term head, tail = STACK_POP_UP(stack_aux);
while (STACK_NOT_EMPTY(stack_aux, stack_terms)) {
head = STACK_POP_UP(stack_aux);
tail = MkPairTerm(head, tail);
}
stack_terms = stack_terms_base - stack_terms_pair_offset;
stack_terms_pair_offset = (int) STACK_POP_DOWN(stack_terms);
STACK_PUSH_UP(tail, stack_terms);
} else { /* CompactPairEndList / CompactPairEndTerm */
Term last;
STACK_CHECK_EXPAND(stack_terms, stack_vars + 1, stack_terms_base);
last = STACK_POP_DOWN(stack_terms);
STACK_PUSH_UP(stack_terms_pair_offset, stack_terms);
stack_terms_pair_offset = (int) (stack_terms_base - stack_terms);
if (t == CompactPairEndList)
STACK_PUSH_UP(TermNil, stack_terms);
STACK_PUSH_UP(last, stack_terms);
}
#else
Term head = STACK_POP_DOWN(stack_terms);
Term tail = STACK_POP_DOWN(stack_terms);
t = MkPairTerm(head, tail);
STACK_PUSH_UP(t, stack_terms);
#endif /* TRIE_COMPACT_PAIRS */
} else if (IsApplTerm(t)) {
Functor f = (Functor) RepAppl(t);
if (f == FunctorDouble) {
volatile Float dbl;
volatile Term *t_dbl = (Term *)((void *) &dbl);
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
*t_dbl = t;
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
*(t_dbl + 1) = t;
#endif /* SIZEOF_DOUBLE x SIZEOF_INT_P */
current_node = TrNode_parent(current_node);
t = MkFloatTerm(dbl);
STACK_CHECK_EXPAND(stack_terms, stack_vars, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else if (f == FunctorLongInt) {
Int li = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
current_node = TrNode_parent(current_node);
t = MkLongIntTerm(li);
STACK_CHECK_EXPAND(stack_terms, stack_vars, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else {
int f_arity = ArityOfFunctor(f);
t = Yap_MkApplTerm(f, f_arity, stack_terms);
stack_terms += f_arity;
STACK_CHECK_EXPAND(stack_terms, stack_vars, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
}
}
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
} while (current_node);
}
for (i = subs_arity; i >= 1; i--) {
CELL *subs_var = (CELL *) *(subs_ptr + i);
t = STACK_POP_DOWN(stack_terms);
Bind(subs_var, t);
}
#ifdef TABLING_ERRORS
if (stack_terms != (CELL *)Yap_TrailTop)
TABLING_ERROR_MESSAGE("stack_terms != Yap_TrailTop (load_answer)");
#endif /* TABLING_ERRORS */
return;
#ifndef GLOBAL_TRIE
#undef current_node
#endif /* GLOBAL_TRIE */
}
#ifdef GLOBAL_TRIE
CELL *load_substitution_variable(gt_node_ptr current_node, CELL *aux_stack_ptr) {
CELL *subs_ptr, *stack_terms_top, *stack_terms_base, *stack_terms;
int vars_arity;
Term t;
#ifdef TRIE_COMPACT_PAIRS
int stack_terms_pair_offset = 0;
#endif /* TRIE_COMPACT_PAIRS */
vars_arity = (int) *aux_stack_ptr;
stack_terms_top = (CELL *) TR;
stack_terms_base = stack_terms = (CELL *) Yap_TrailTop;
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
do {
if (IsVarTerm(t)) {
int var_index = VarIndexOfTableTerm(t);
t = MkVarTerm();
if (var_index >= vars_arity) {
while (vars_arity < var_index) {
*aux_stack_ptr-- = 0;
vars_arity++;
}
*aux_stack_ptr-- = t;
vars_arity++;
*aux_stack_ptr = vars_arity;
} else {
/* do the same as in macro stack_trie_val_instr() */
CELL aux_sub, aux_var, *vars_ptr;
vars_ptr = aux_stack_ptr + vars_arity - var_index;
aux_sub = *((CELL *) t);
aux_var = *vars_ptr;
if (aux_var == 0) {
*vars_ptr = t;
} else {
if (aux_sub > aux_var) {
if ((CELL *) aux_sub <= H) {
Bind_Global((CELL *) aux_sub, aux_var);
} else if ((CELL *) aux_var <= H) {
Bind_Local((CELL *) aux_sub, aux_var);
} else {
Bind_Local((CELL *) aux_var, aux_sub);
*vars_ptr = aux_sub;
}
} else {
if ((CELL *) aux_var <= H) {
Bind_Global((CELL *) aux_var, aux_sub);
*vars_ptr = aux_sub;
} else if ((CELL *) aux_sub <= H) {
Bind_Local((CELL *) aux_var, aux_sub);
*vars_ptr = aux_sub;
} else {
Bind_Local((CELL *) aux_sub, aux_var);
}
}
}
}
STACK_CHECK_EXPAND(stack_terms, stack_terms_top, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else if (IsAtomOrIntTerm(t)) {
STACK_CHECK_EXPAND(stack_terms, stack_terms_top, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else if (IsPairTerm(t)) {
#ifdef TRIE_COMPACT_PAIRS
if (t == CompactPairInit) {
Term *stack_aux = stack_terms_base - stack_terms_pair_offset;
Term head, tail = STACK_POP_UP(stack_aux);
while (STACK_NOT_EMPTY(stack_aux, stack_terms)) {
head = STACK_POP_UP(stack_aux);
tail = MkPairTerm(head, tail);
}
stack_terms = stack_terms_base - stack_terms_pair_offset;
stack_terms_pair_offset = (int) STACK_POP_DOWN(stack_terms);
STACK_PUSH_UP(tail, stack_terms);
} else { /* CompactPairEndList / CompactPairEndTerm */
Term last;
STACK_CHECK_EXPAND(stack_terms, stack_terms_top + 1, stack_terms_base);
last = STACK_POP_DOWN(stack_terms);
STACK_PUSH_UP(stack_terms_pair_offset, stack_terms);
stack_terms_pair_offset = (int) (stack_terms_base - stack_terms);
if (t == CompactPairEndList)
STACK_PUSH_UP(TermNil, stack_terms);
STACK_PUSH_UP(last, stack_terms);
}
#else
Term head = STACK_POP_DOWN(stack_terms);
Term tail = STACK_POP_DOWN(stack_terms);
t = MkPairTerm(head, tail);
STACK_PUSH_UP(t, stack_terms);
#endif /* TRIE_COMPACT_PAIRS */
} else if (IsApplTerm(t)) {
Functor f = (Functor) RepAppl(t);
if (f == FunctorDouble) {
volatile Float dbl;
volatile Term *t_dbl = (Term *)((void *) &dbl);
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
*t_dbl = t;
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
*(t_dbl + 1) = t;
#endif /* SIZEOF_DOUBLE x SIZEOF_INT_P */
current_node = TrNode_parent(current_node);
t = MkFloatTerm(dbl);
STACK_CHECK_EXPAND(stack_terms, stack_terms_top, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else if (f == FunctorLongInt) {
Int li = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
current_node = TrNode_parent(current_node);
t = MkLongIntTerm(li);
STACK_CHECK_EXPAND(stack_terms, stack_terms_top, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
} else {
int f_arity = ArityOfFunctor(f);
t = Yap_MkApplTerm(f, f_arity, stack_terms);
stack_terms += f_arity;
STACK_CHECK_EXPAND(stack_terms, stack_terms_top, stack_terms_base);
STACK_PUSH_UP(t, stack_terms);
}
}
t = TrNode_entry(current_node);
current_node = TrNode_parent(current_node);
} while (current_node);
subs_ptr = aux_stack_ptr + vars_arity + 1;
*subs_ptr = *subs_ptr - 1;
subs_ptr += *subs_ptr + 1;
t = STACK_POP_DOWN(stack_terms);
Bind((CELL *) *subs_ptr, t);
#ifdef TABLING_ERRORS
if (stack_terms != (CELL *)Yap_TrailTop)
TABLING_ERROR_MESSAGE("stack_terms != Yap_TrailTop (load_substitution_variable)");
#endif /* TABLING_ERRORS */
return aux_stack_ptr;
}
#endif /* GLOBAL_TRIE */
void private_completion(sg_fr_ptr sg_fr) {
/* complete subgoals */
#ifdef LIMIT_TABLING
sg_fr_ptr aux_sg_fr;
while (LOCAL_top_sg_fr != sg_fr) {
aux_sg_fr = LOCAL_top_sg_fr;
LOCAL_top_sg_fr = SgFr_next(aux_sg_fr);
mark_as_completed(aux_sg_fr);
insert_into_global_sg_fr_list(aux_sg_fr);
}
aux_sg_fr = LOCAL_top_sg_fr;
LOCAL_top_sg_fr = SgFr_next(aux_sg_fr);
mark_as_completed(aux_sg_fr);
insert_into_global_sg_fr_list(aux_sg_fr);
#else
while (LOCAL_top_sg_fr != sg_fr) {
mark_as_completed(LOCAL_top_sg_fr);
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
}
mark_as_completed(LOCAL_top_sg_fr);
LOCAL_top_sg_fr = SgFr_next(LOCAL_top_sg_fr);
#endif /* LIMIT_TABLING */
/* release dependency frames */
while (EQUAL_OR_YOUNGER_CP(DepFr_cons_cp(LOCAL_top_dep_fr), B)) { /* never equal if batched scheduling */
dep_fr_ptr dep_fr = DepFr_next(LOCAL_top_dep_fr);
FREE_DEPENDENCY_FRAME(LOCAL_top_dep_fr);
LOCAL_top_dep_fr = dep_fr;
}
/* adjust freeze registers */
adjust_freeze_registers();
return;
}
#ifdef GLOBAL_TRIE
void free_subgoal_trie_branch(sg_node_ptr current_node, int nodes_left, int position) {
if (nodes_left != 1)
free_subgoal_trie_branch(TrNode_child(current_node), nodes_left - 1, TRAVERSE_POSITION_FIRST);
#else
void free_subgoal_trie_branch(sg_node_ptr current_node, int nodes_left, int nodes_extra, int position) {
int current_nodes_left = 0, current_nodes_extra = 0;
/* save current state if first sibling node */
if (position == TRAVERSE_POSITION_FIRST) {
current_nodes_left = nodes_left;
current_nodes_extra = nodes_extra;
}
if (nodes_extra) {
#ifdef TRIE_COMPACT_PAIRS
if (nodes_extra < 0) {
Term t = TrNode_entry(current_node);
if (IsPairTerm(t)) {
if (t == CompactPairInit)
nodes_extra--;
else /* CompactPairEndList / CompactPairEndTerm */
nodes_extra++;
}
} else
#endif /* TRIE_COMPACT_PAIRS */
if (--nodes_extra == 0)
nodes_left--;
} else {
Term t = TrNode_entry(current_node);
if (IsVarTerm(t) || IsAtomOrIntTerm(t))
nodes_left--;
else if (IsPairTerm(t))
#ifdef TRIE_COMPACT_PAIRS
/* CompactPairInit */
nodes_extra = -1;
#else
nodes_left++;
#endif /* TRIE_COMPACT_PAIRS */
else if (IsApplTerm(t)) {
Functor f = (Functor) RepAppl(t);
if (f == FunctorDouble)
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
nodes_extra = 2;
#else
nodes_extra = 1;
#endif /* SIZEOF_DOUBLE x SIZEOF_INT_P */
else if (f == FunctorLongInt)
nodes_extra = 1;
else
nodes_left += ArityOfFunctor(f) - 1;
}
}
if (nodes_left)
free_subgoal_trie_branch(TrNode_child(current_node), nodes_left, nodes_extra, TRAVERSE_POSITION_FIRST);
#endif /* GLOBAL_TRIE */
else {
sg_fr_ptr sg_fr;
ans_node_ptr ans_node;
sg_fr = (sg_fr_ptr) TrNode_sg_fr(current_node);
free_answer_trie_hash_chain(SgFr_hash_chain(sg_fr));
ans_node = SgFr_answer_trie(sg_fr);
if (TrNode_child(ans_node))
free_answer_trie_branch(TrNode_child(ans_node), TRAVERSE_POSITION_FIRST);
FREE_ANSWER_TRIE_NODE(ans_node);
#ifdef LIMIT_TABLING
remove_from_global_sg_fr_list(sg_fr);
#endif /* LIMIT_TABLING */
FREE_SUBGOAL_FRAME(sg_fr);
}
if (position == TRAVERSE_POSITION_FIRST) {
sg_node_ptr next_node = TrNode_next(current_node);
DECREMENT_GLOBAL_TRIE_REFS(TrNode_entry(current_node));
FREE_SUBGOAL_TRIE_NODE(current_node);
#ifndef GLOBAL_TRIE
/* restore the initial state */
nodes_left = current_nodes_left;
nodes_extra = current_nodes_extra;
#endif /* GLOBAL_TRIE */
while (next_node) {
current_node = next_node;
next_node = TrNode_next(current_node);
#ifdef GLOBAL_TRIE
free_subgoal_trie_branch(current_node, nodes_left, TRAVERSE_POSITION_NEXT);
#else
free_subgoal_trie_branch(current_node, nodes_left, nodes_extra, TRAVERSE_POSITION_NEXT);
#endif /* GLOBAL_TRIE */
}
} else {
DECREMENT_GLOBAL_TRIE_REFS(TrNode_entry(current_node));
FREE_SUBGOAL_TRIE_NODE(current_node);
}
return;
}
void free_answer_trie_branch(ans_node_ptr current_node, int position) {
#ifdef TABLING_INNER_CUTS
if (TrNode_child(current_node) && ! IS_ANSWER_LEAF_NODE(current_node))
#else
if (! IS_ANSWER_LEAF_NODE(current_node))
#endif /* TABLING_INNER_CUTS */
free_answer_trie_branch(TrNode_child(current_node), TRAVERSE_POSITION_FIRST);
if (position == TRAVERSE_POSITION_FIRST) {
ans_node_ptr next_node = TrNode_next(current_node);
DECREMENT_GLOBAL_TRIE_REFS(TrNode_entry(current_node));
FREE_ANSWER_TRIE_NODE(current_node);
while (next_node) {
current_node = next_node;
next_node = TrNode_next(current_node);
free_answer_trie_branch(current_node, TRAVERSE_POSITION_NEXT);
}
} else {
DECREMENT_GLOBAL_TRIE_REFS(TrNode_entry(current_node));
FREE_ANSWER_TRIE_NODE(current_node);
}
return;
}
void update_answer_trie(sg_fr_ptr sg_fr) {
ans_node_ptr current_node;
free_answer_trie_hash_chain(SgFr_hash_chain(sg_fr));
SgFr_hash_chain(sg_fr) = NULL;
SgFr_state(sg_fr) += 2; /* complete --> compiled : complete_in_use --> compiled_in_use */
current_node = TrNode_child(SgFr_answer_trie(sg_fr));
if (current_node) {
#ifdef YAPOR
TrNode_instr(current_node) -= 1;
#ifdef TABLING_INNER_CUTS
update_answer_trie_branch(NULL, current_node);
#else
update_answer_trie_branch(current_node);
#endif /* TABLING_INNER_CUTS */
#else /* TABLING */
update_answer_trie_branch(current_node, TRAVERSE_POSITION_FIRST);
#endif /* YAPOR */
}
return;
}
static struct trie_statistics{
int show;
long subgoals;
long subgoals_incomplete;
long subgoal_trie_nodes;
long answers;
#ifdef TABLING_INNER_CUTS
long answers_pruned;
#endif /* TABLING_INNER_CUTS */
long answers_true;
long answers_no;
long answer_trie_nodes;
#ifdef GLOBAL_TRIE
long global_trie_terms;
long global_trie_nodes;
#endif /* GLOBAL_TRIE */
} trie_stats;
#define TrStat_show trie_stats.show
#define TrStat_subgoals trie_stats.subgoals
#define TrStat_sg_incomplete trie_stats.subgoals_incomplete
#define TrStat_sg_nodes trie_stats.subgoal_trie_nodes
#define TrStat_answers trie_stats.answers
#define TrStat_answers_true trie_stats.answers_true
#define TrStat_answers_no trie_stats.answers_no
#define TrStat_answers_pruned trie_stats.answers_pruned
#define TrStat_ans_nodes trie_stats.answer_trie_nodes
#define TrStat_gt_terms trie_stats.global_trie_terms
#define TrStat_gt_nodes trie_stats.global_trie_nodes
#define SHOW_TABLE_STRUCTURE(MESG, ARGS...) if (TrStat_show == SHOW_MODE_STRUCTURE) fprintf(Yap_stdout, MESG, ##ARGS)
#define STR_ARRAY_SIZE 100000
#define ARITY_ARRAY_SIZE 10000
void show_table(tab_ent_ptr tab_ent, int show_mode) {
sg_node_ptr sg_node;
TrStat_show = show_mode;
if (show_mode == SHOW_MODE_STATISTICS) {
TrStat_subgoals = 0;
TrStat_sg_incomplete = 0;
TrStat_sg_nodes = 1;
TrStat_answers = 0;
TrStat_answers_true = 0;
TrStat_answers_no = 0;
#ifdef TABLING_INNER_CUTS
TrStat_answers_pruned = 0;
#endif /* TABLING_INNER_CUTS */
TrStat_ans_nodes = 0;
fprintf(Yap_stdout, "Table statistics for predicate '%s/%d'\n", AtomName(TabEnt_atom(tab_ent)), TabEnt_arity(tab_ent));
} else { /* show_mode == SHOW_MODE_STRUCTURE */
fprintf(Yap_stdout, "Table structure for predicate '%s/%d'\n", AtomName(TabEnt_atom(tab_ent)), TabEnt_arity(tab_ent));
}
sg_node = TrNode_child(TabEnt_subgoal_trie(tab_ent));
if (sg_node) {
if (TabEnt_arity(tab_ent)) {
char *str = (char *) malloc(sizeof(char) * STR_ARRAY_SIZE);
int str_index = sprintf(str, " ?- %s(", AtomName(TabEnt_atom(tab_ent)));
int *arity = (int *) malloc(sizeof(int) * ARITY_ARRAY_SIZE);
arity[0] = 1;
arity[1] = TabEnt_arity(tab_ent);
traverse_subgoal_trie(sg_node, str, str_index, arity, TRAVERSE_MODE_NORMAL, TRAVERSE_POSITION_FIRST);
free(str);
free(arity);
} else {
sg_fr_ptr sg_fr = (sg_fr_ptr) sg_node;
TrStat_subgoals++;
SHOW_TABLE_STRUCTURE(" ?- %s.\n", AtomName(TabEnt_atom(tab_ent)));
TrStat_ans_nodes++;
if (SgFr_first_answer(sg_fr) == NULL) {
if (SgFr_state(sg_fr) < complete) {
TrStat_sg_incomplete++;
SHOW_TABLE_STRUCTURE(" ---> INCOMPLETE\n");
} else {
TrStat_answers_no++;
SHOW_TABLE_STRUCTURE(" NO\n");
}
} else { /* SgFr_first_answer(sg_fr) == SgFr_answer_trie(sg_fr) */
TrStat_answers_true++;
SHOW_TABLE_STRUCTURE(" TRUE\n");
}
}
} else
SHOW_TABLE_STRUCTURE(" EMPTY\n");
if (show_mode == SHOW_MODE_STATISTICS) {
fprintf(Yap_stdout, " Subgoal trie structure\n");
fprintf(Yap_stdout, " Subgoals: %ld (%ld incomplete)\n", TrStat_subgoals, TrStat_sg_incomplete);
fprintf(Yap_stdout, " Subgoal trie nodes: %ld\n", TrStat_sg_nodes);
fprintf(Yap_stdout, " Answer trie structure(s)\n");
#ifdef TABLING_INNER_CUTS
fprintf(Yap_stdout, " Answers: %ld (%ld pruned)\n", TrStat_answers, TrStat_answers_pruned);
#else
fprintf(Yap_stdout, " Answers: %ld\n", TrStat_answers);
#endif /* TABLING_INNER_CUTS */
fprintf(Yap_stdout, " Answers 'TRUE': %ld\n", TrStat_answers_true);
fprintf(Yap_stdout, " Answers 'NO': %ld\n", TrStat_answers_no);
fprintf(Yap_stdout, " Answer trie nodes: %ld\n", TrStat_ans_nodes);
fprintf(Yap_stdout, " Total memory in use: %ld bytes\n",
sizeof(struct table_entry) + TrStat_sg_nodes * sizeof(struct subgoal_trie_node) +
TrStat_ans_nodes * sizeof(struct answer_trie_node) + TrStat_subgoals * sizeof(struct subgoal_frame));
}
return;
}
#ifdef GLOBAL_TRIE
void show_global_trie(void) {
TrStat_show = SHOW_MODE_STRUCTURE;
TrStat_gt_terms = 0;
TrStat_gt_nodes = 1;
fprintf(Yap_stdout, "Global trie structure\n");
if (TrNode_child(GLOBAL_root_gt)) {
char *str = (char *) malloc(sizeof(char) * STR_ARRAY_SIZE);
int *arity = (int *) malloc(sizeof(int) * ARITY_ARRAY_SIZE);
arity[0] = 0;
traverse_global_trie(TrNode_child(GLOBAL_root_gt), str, 0, arity, TRAVERSE_MODE_NORMAL, TRAVERSE_POSITION_FIRST);
free(str);
free(arity);
} else
SHOW_TABLE_STRUCTURE(" EMPTY\n");
fprintf(Yap_stdout, "Global trie statistics\n");
fprintf(Yap_stdout, " Terms: %ld\n", TrStat_gt_terms);
fprintf(Yap_stdout, " Global trie nodes: %ld\n", TrStat_gt_nodes);
fprintf(Yap_stdout, " Total memory in use: %ld bytes\n", TrStat_gt_nodes * sizeof(struct global_trie_node));
return;
}
#endif /* GLOBAL_TRIE */
/* ------------------------- **
** Local functions **
** ------------------------- */
#ifdef YAPOR
#ifdef TABLING_INNER_CUTS
static
int update_answer_trie_branch(ans_node_ptr previous_node, ans_node_ptr current_node) {
int ltt;
if (! IS_ANSWER_LEAF_NODE(current_node)) {
if (TrNode_child(current_node)) {
TrNode_instr(TrNode_child(current_node)) -= 1; /* retry --> try */
update_answer_trie_branch(NULL, TrNode_child(current_node));
if (TrNode_child(current_node))
goto update_next_trie_branch;
}
/* node belonging to a pruned answer */
if (previous_node) {
TrNode_next(previous_node) = TrNode_next(current_node);
FREE_ANSWER_TRIE_NODE(current_node);
if (TrNode_next(previous_node)) {
return update_answer_trie_branch(previous_node, TrNode_next(previous_node));
} else {
TrNode_instr(previous_node) -= 2; /* retry --> trust : try --> do */
return 0;
}
} else {
TrNode_child(TrNode_parent(current_node)) = TrNode_next(current_node);
if (TrNode_next(current_node)) {
TrNode_instr(TrNode_next(current_node)) -= 1; /* retry --> try */
update_answer_trie_branch(NULL, TrNode_next(current_node));
}
FREE_ANSWER_TRIE_NODE(current_node);
return 0;
}
}
update_next_trie_branch:
if (TrNode_next(current_node)) {
ltt = 1 + update_answer_trie_branch(current_node, TrNode_next(current_node));
} else {
TrNode_instr(current_node) -= 2; /* retry --> trust : try --> do */
ltt = 1;
}
TrNode_or_arg(current_node) = ltt;
TrNode_instr(current_node) = Yap_opcode(TrNode_instr(current_node));
return ltt;
}
#else
static
int update_answer_trie_branch(ans_node_ptr current_node) {
int ltt;
if (! IS_ANSWER_LEAF_NODE(current_node)) {
TrNode_instr(TrNode_child(current_node)) -= 1; /* retry --> try */
update_answer_trie_branch(TrNode_child(current_node));
}
if (TrNode_next(current_node)) {
ltt = 1 + update_answer_trie_branch(TrNode_next(current_node));
} else {
TrNode_instr(current_node) -= 2; /* retry --> trust : try --> do */
ltt = 1;
}
TrNode_or_arg(current_node) = ltt;
TrNode_instr(current_node) = Yap_opcode(TrNode_instr(current_node));
return ltt;
}
#endif /* TABLING_INNER_CUTS */
#else /* TABLING */
static
void update_answer_trie_branch(ans_node_ptr current_node, int position) {
if (! IS_ANSWER_LEAF_NODE(current_node))
update_answer_trie_branch(TrNode_child(current_node), TRAVERSE_POSITION_FIRST); /* retry --> try */
if (position == TRAVERSE_POSITION_FIRST) {
ans_node_ptr next = TrNode_next(current_node);
if (next) {
while (TrNode_next(next)) {
update_answer_trie_branch(next, TRAVERSE_POSITION_NEXT); /* retry --> retry */
next = TrNode_next(next);
}
update_answer_trie_branch(next, TRAVERSE_POSITION_LAST); /* retry --> trust */
} else
position += TRAVERSE_POSITION_LAST; /* try --> do */
}
TrNode_instr(current_node) = Yap_opcode(TrNode_instr(current_node) - position);
return;
}
#endif /* YAPOR */
static
void traverse_subgoal_trie(sg_node_ptr current_node, char *str, int str_index, int *arity, int mode, int position) {
int *current_arity = NULL, current_str_index = 0, current_mode = 0;
/* test if hashing */
if (IS_SUBGOAL_TRIE_HASH(current_node)) {
sg_node_ptr *bucket, *last_bucket;
sg_hash_ptr hash;
hash = (sg_hash_ptr) current_node;
bucket = Hash_buckets(hash);
last_bucket = bucket + Hash_num_buckets(hash);
current_arity = (int *) malloc(sizeof(int) * (arity[0] + 1));
memcpy(current_arity, arity, sizeof(int) * (arity[0] + 1));
do {
if (*bucket) {
traverse_subgoal_trie(*bucket, str, str_index, arity, mode, TRAVERSE_POSITION_FIRST);
memcpy(arity, current_arity, sizeof(int) * (current_arity[0] + 1));
#ifdef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -2 && str[str_index - 1] != '[')
str[str_index - 1] = ',';
#else
if (arity[arity[0]] == -1)
str[str_index - 1] = '|';
#endif /* TRIE_COMPACT_PAIRS */
}
} while (++bucket != last_bucket);
free(current_arity);
return;
}
/* save current state if first sibling node */
if (position == TRAVERSE_POSITION_FIRST) {
current_arity = (int *) malloc(sizeof(int) * (arity[0] + 1));
memcpy(current_arity, arity, sizeof(int) * (arity[0] + 1));
current_str_index = str_index;
current_mode = mode;
}
/* process current trie node */
TrStat_sg_nodes++;
#ifdef GLOBAL_TRIE
traverse_global_trie_for_subgoal(TrNode_entry(current_node), str, &str_index, arity, &mode);
#else
traverse_trie_node(TrNode_entry(current_node), str, &str_index, arity, &mode, TRAVERSE_TYPE_SUBGOAL);
#endif /* GLOBAL_TRIE */
/* continue with child node ... */
if (arity[0] != 0)
traverse_subgoal_trie(TrNode_child(current_node), str, str_index, arity, mode, TRAVERSE_POSITION_FIRST);
/* ... or show answers */
else {
sg_fr_ptr sg_fr = (sg_fr_ptr) TrNode_sg_fr(current_node);
TrStat_subgoals++;
str[str_index] = 0;
SHOW_TABLE_STRUCTURE("%s.\n", str);
TrStat_ans_nodes++;
if (SgFr_first_answer(sg_fr) == NULL) {
if (SgFr_state(sg_fr) < complete) {
TrStat_sg_incomplete++;
SHOW_TABLE_STRUCTURE(" ---> INCOMPLETE\n");
} else {
TrStat_answers_no++;
SHOW_TABLE_STRUCTURE(" NO\n");
}
} else if (SgFr_first_answer(sg_fr) == SgFr_answer_trie(sg_fr)) {
TrStat_answers_true++;
SHOW_TABLE_STRUCTURE(" TRUE\n");
} else {
arity[0] = 0;
traverse_answer_trie(TrNode_child(SgFr_answer_trie(sg_fr)), &str[str_index], 0, arity, 0, TRAVERSE_MODE_NORMAL, TRAVERSE_POSITION_FIRST);
if (SgFr_state(sg_fr) < complete) {
TrStat_sg_incomplete++;
SHOW_TABLE_STRUCTURE(" ---> INCOMPLETE\n");
}
}
}
/* restore the initial state and continue with sibling nodes */
if (position == TRAVERSE_POSITION_FIRST) {
str_index = current_str_index;
mode = current_mode;
current_node = TrNode_next(current_node);
while (current_node) {
memcpy(arity, current_arity, sizeof(int) * (current_arity[0] + 1));
#ifdef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -2 && str[str_index - 1] != '[')
str[str_index - 1] = ',';
#else
if (arity[arity[0]] == -1)
str[str_index - 1] = '|';
#endif /* TRIE_COMPACT_PAIRS */
traverse_subgoal_trie(current_node, str, str_index, arity, mode, TRAVERSE_POSITION_NEXT);
current_node = TrNode_next(current_node);
}
free(current_arity);
}
return;
}
static
void traverse_answer_trie(ans_node_ptr current_node, char *str, int str_index, int *arity, int var_index, int mode, int position) {
int *current_arity = NULL, current_str_index = 0, current_var_index = 0, current_mode = 0;
/* test if hashing */
if (IS_ANSWER_TRIE_HASH(current_node)) {
ans_node_ptr *bucket, *last_bucket;
ans_hash_ptr hash;
hash = (ans_hash_ptr) current_node;
bucket = Hash_buckets(hash);
last_bucket = bucket + Hash_num_buckets(hash);
current_arity = (int *) malloc(sizeof(int) * (arity[0] + 1));
memcpy(current_arity, arity, sizeof(int) * (arity[0] + 1));
do {
if (*bucket) {
traverse_answer_trie(*bucket, str, str_index, arity, var_index, mode, TRAVERSE_POSITION_FIRST);
memcpy(arity, current_arity, sizeof(int) * (current_arity[0] + 1));
#ifdef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -2 && str[str_index - 1] != '[')
str[str_index - 1] = ',';
#else
if (arity[arity[0]] == -1)
str[str_index - 1] = '|';
#endif /* TRIE_COMPACT_PAIRS */
}
} while (++bucket != last_bucket);
free(current_arity);
return;
}
/* save current state if first sibling node */
if (position == TRAVERSE_POSITION_FIRST) {
current_arity = (int *) malloc(sizeof(int) * (arity[0] + 1));
memcpy(current_arity, arity, sizeof(int) * (arity[0] + 1));
current_str_index = str_index;
current_var_index = var_index;
current_mode = mode;
}
/* print VAR if starting a term */
if (arity[0] == 0 && mode == TRAVERSE_MODE_NORMAL) {
str_index += sprintf(& str[str_index], " VAR%d: ", var_index);
var_index++;
}
/* process current trie node */
TrStat_ans_nodes++;
#ifdef GLOBAL_TRIE
traverse_global_trie_for_answer(TrNode_entry(current_node), str, &str_index, arity, &mode);
#else
traverse_trie_node(TrNode_entry(current_node), str, &str_index, arity, &mode, TRAVERSE_TYPE_ANSWER);
#endif /* GLOBAL_TRIE */
/* show answer .... */
if (IS_ANSWER_LEAF_NODE(current_node)) {
TrStat_answers++;
str[str_index] = 0;
SHOW_TABLE_STRUCTURE("%s\n", str);
}
#ifdef TABLING_INNER_CUTS
/* ... or continue with pruned node */
else if (TrNode_child(current_node) == NULL)
TrStat_answers++;
TrStat_answers_pruned++;
#endif /* TABLING_INNER_CUTS */
/* ... or continue with child node */
else
traverse_answer_trie(TrNode_child(current_node), str, str_index, arity, var_index, mode, TRAVERSE_POSITION_FIRST);
/* restore the initial state and continue with sibling nodes */
if (position == TRAVERSE_POSITION_FIRST) {
str_index = current_str_index;
var_index = current_var_index;
mode = current_mode;
current_node = TrNode_next(current_node);
while (current_node) {
memcpy(arity, current_arity, sizeof(int) * (current_arity[0] + 1));
#ifdef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -2 && str[str_index - 1] != '[')
str[str_index - 1] = ',';
#else
if (arity[arity[0]] == -1)
str[str_index - 1] = '|';
#endif /* TRIE_COMPACT_PAIRS */
traverse_answer_trie(current_node, str, str_index, arity, var_index, mode, TRAVERSE_POSITION_NEXT);
current_node = TrNode_next(current_node);
}
free(current_arity);
}
return;
}
static
void traverse_trie_node(Term t, char *str, int *str_index_ptr, int *arity, int *mode_ptr, int type) {
int mode = *mode_ptr;
int str_index = *str_index_ptr;
/* test the node type */
if (mode == TRAVERSE_MODE_FLOAT) {
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
arity[0]++;
arity[arity[0]] = (int) t;
mode = TRAVERSE_MODE_FLOAT2;
} else if (mode == TRAVERSE_MODE_FLOAT2) {
volatile Float dbl;
volatile Term *t_dbl = (Term *)((void *) &dbl);
*t_dbl = t;
*(t_dbl + 1) = (Term) arity[arity[0]];
arity[0]--;
#else /* SIZEOF_DOUBLE == SIZEOF_INT_P */
volatile Float dbl;
volatile Term *t_dbl = (Term *)((void *) &dbl);
*t_dbl = t;
#endif /* SIZEOF_DOUBLE x SIZEOF_INT_P */
str_index += sprintf(& str[str_index], "%.15g", dbl);
while (arity[0]) {
if (arity[arity[0]] > 0) {
arity[arity[0]]--;
if (arity[arity[0]] == 0) {
str_index += sprintf(& str[str_index], ")");
arity[0]--;
} else {
str_index += sprintf(& str[str_index], ",");
break;
}
} else {
if (arity[arity[0]] == -2) {
#ifdef TRIE_COMPACT_PAIRS
str_index += sprintf(& str[str_index], ",");
#else
str_index += sprintf(& str[str_index], "|");
arity[arity[0]] = -1;
#endif /* TRIE_COMPACT_PAIRS */
break;
} else {
str_index += sprintf(& str[str_index], "]");
arity[0]--;
}
}
}
#ifndef GLOBAL_TRIE
if (type == TRAVERSE_TYPE_SUBGOAL)
mode = TRAVERSE_MODE_NORMAL;
else /* type == TRAVERSE_TYPE_ANSWER */
#endif /* GLOBAL_TRIE */
mode = TRAVERSE_MODE_FLOAT_END;
} else if (mode == TRAVERSE_MODE_FLOAT_END) {
mode = TRAVERSE_MODE_NORMAL;
} else if (mode == TRAVERSE_MODE_LONG) {
Int li = (Int) t;
#if SHORT_INTS
str_index += sprintf(& str[str_index], "%ld", li);
#else
str_index += sprintf(& str[str_index], "%d", li);
#endif /* SHORT_INTS */
while (arity[0]) {
if (arity[arity[0]] > 0) {
arity[arity[0]]--;
if (arity[arity[0]] == 0) {
str_index += sprintf(& str[str_index], ")");
arity[0]--;
} else {
str_index += sprintf(& str[str_index], ",");
break;
}
} else {
if (arity[arity[0]] == -2) {
#ifdef TRIE_COMPACT_PAIRS
str_index += sprintf(& str[str_index], ",");
#else
str_index += sprintf(& str[str_index], "|");
arity[arity[0]] = -1;
#endif /* TRIE_COMPACT_PAIRS */
break;
} else {
str_index += sprintf(& str[str_index], "]");
arity[0]--;
}
}
}
#ifndef GLOBAL_TRIE
if (type == TRAVERSE_TYPE_SUBGOAL)
mode = TRAVERSE_MODE_NORMAL;
else /* type == TRAVERSE_TYPE_ANSWER */
#endif /* GLOBAL_TRIE */
mode = TRAVERSE_MODE_LONG_END;
} else if (mode == TRAVERSE_MODE_LONG_END) {
mode = TRAVERSE_MODE_NORMAL;
} else if (IsVarTerm(t)) {
if (type == TRAVERSE_TYPE_SUBGOAL)
str_index += sprintf(& str[str_index], "VAR%d", VarIndexOfTableTerm(t));
else /* type == TRAVERSE_TYPE_ANSWER */
str_index += sprintf(& str[str_index], "ANSVAR%d", VarIndexOfTableTerm(t));
while (arity[0]) {
if (arity[arity[0]] > 0) {
arity[arity[0]]--;
if (arity[arity[0]] == 0) {
str_index += sprintf(& str[str_index], ")");
arity[0]--;
} else {
str_index += sprintf(& str[str_index], ",");
break;
}
} else {
if (arity[arity[0]] == -2) {
#ifdef TRIE_COMPACT_PAIRS
str_index += sprintf(& str[str_index], ",");
#else
str_index += sprintf(& str[str_index], "|");
arity[arity[0]] = -1;
#endif /* TRIE_COMPACT_PAIRS */
break;
} else {
str_index += sprintf(& str[str_index], "]");
arity[0]--;
}
}
}
} else if (IsIntTerm(t)) {
#if SHORT_INTS
str_index += sprintf(& str[str_index], "%ld", IntOfTerm(t));
#else
str_index += sprintf(& str[str_index], "%d", IntOfTerm(t));
#endif /* SHORT_INTS */
while (arity[0]) {
if (arity[arity[0]] > 0) {
arity[arity[0]]--;
if (arity[arity[0]] == 0) {
str_index += sprintf(& str[str_index], ")");
arity[0]--;
} else {
str_index += sprintf(& str[str_index], ",");
break;
}
} else {
if (arity[arity[0]] == -2) {
#ifdef TRIE_COMPACT_PAIRS
str_index += sprintf(& str[str_index], ",");
#else
str_index += sprintf(& str[str_index], "|");
arity[arity[0]] = -1;
#endif /* TRIE_COMPACT_PAIRS */
break;
} else {
str_index += sprintf(& str[str_index], "]");
arity[0]--;
}
}
}
} else if (IsAtomTerm(t)) {
#ifndef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -1 && t == TermNil) {
str[str_index - 1] = ']';
arity[0]--;
} else
#endif /* TRIE_COMPACT_PAIRS */
str_index += sprintf(& str[str_index], "%s", AtomName(AtomOfTerm(t)));
while (arity[0]) {
if (arity[arity[0]] > 0) {
arity[arity[0]]--;
if (arity[arity[0]] == 0) {
str_index += sprintf(& str[str_index], ")");
arity[0]--;
} else {
str_index += sprintf(& str[str_index], ",");
break;
}
} else {
if (arity[arity[0]] == -2) {
#ifdef TRIE_COMPACT_PAIRS
str_index += sprintf(& str[str_index], ",");
#else
str_index += sprintf(& str[str_index], "|");
arity[arity[0]] = -1;
#endif /* TRIE_COMPACT_PAIRS */
break;
} else {
str_index += sprintf(& str[str_index], "]");
arity[0]--;
}
}
}
} else if (IsPairTerm(t)) {
#ifdef TRIE_COMPACT_PAIRS
if (t == CompactPairEndList)
arity[arity[0]] = -1;
else if (t == CompactPairEndTerm) {
str[str_index - 1] = '|';
arity[arity[0]] = -1;
#else
if (arity[arity[0]] == -1) {
str[str_index - 1] = ',';
arity[arity[0]] = -2;
#endif /* TRIE_COMPACT_PAIRS */
} else {
str_index += sprintf(& str[str_index], "[");
arity[0]++;
arity[arity[0]] = -2;
}
} else if (IsApplTerm(t)) {
Functor f = (Functor) RepAppl(t);
if (f == FunctorDouble) {
mode = TRAVERSE_MODE_FLOAT;
} else if (f == FunctorLongInt) {
mode = TRAVERSE_MODE_LONG;
} else {
str_index += sprintf(& str[str_index], "%s(", AtomName(NameOfFunctor(f)));
arity[0]++;
arity[arity[0]] = ArityOfFunctor(f);
}
}
*mode_ptr = mode;
*str_index_ptr = str_index;
return;
}
#ifdef GLOBAL_TRIE
static
void free_global_trie_branch(gt_node_ptr current_node) {
gt_node_ptr parent_node, child_node;
parent_node = TrNode_parent(current_node);
child_node = TrNode_child(parent_node);
if (IS_GLOBAL_TRIE_HASH(child_node)) {
gt_hash_ptr hash;
gt_node_ptr *bucket;
hash = (gt_hash_ptr) child_node;
Hash_num_nodes(hash)--;
bucket = Hash_bucket(hash, HASH_ENTRY(TrNode_entry(current_node), Hash_seed(hash)));
child_node = *bucket;
if (child_node != current_node) {
while (TrNode_next(child_node) != current_node)
child_node = TrNode_next(child_node);
TrNode_next(child_node) = TrNode_next(current_node);
FREE_GLOBAL_TRIE_NODE(current_node);
} else {
*bucket = TrNode_next(current_node);
FREE_GLOBAL_TRIE_NODE(current_node);
if (Hash_num_nodes(hash) == 0) {
FREE_HASH_BUCKETS(Hash_buckets(hash));
FREE_GLOBAL_TRIE_HASH(hash);
if (parent_node != GLOBAL_root_gt)
free_global_trie_branch(parent_node);
else
TrNode_child(parent_node) = NULL;
}
}
} else if (child_node != current_node) {
while (TrNode_next(child_node) != current_node)
child_node = TrNode_next(child_node);
TrNode_next(child_node) = TrNode_next(current_node);
FREE_GLOBAL_TRIE_NODE(current_node);
} else if (TrNode_next(current_node) == NULL) {
FREE_GLOBAL_TRIE_NODE(current_node);
if (parent_node != GLOBAL_root_gt)
free_global_trie_branch(parent_node);
else
TrNode_child(parent_node) = NULL;
} else {
TrNode_child(parent_node) = TrNode_next(current_node);
FREE_GLOBAL_TRIE_NODE(current_node);
}
return;
}
static
void traverse_global_trie(gt_node_ptr current_node, char *str, int str_index, int *arity, int mode, int position) {
int *current_arity = NULL, current_str_index = 0, current_mode = 0;
/* test if hashing */
if (IS_GLOBAL_TRIE_HASH(current_node)) {
gt_node_ptr *bucket, *last_bucket;
gt_hash_ptr hash;
hash = (gt_hash_ptr) current_node;
bucket = Hash_buckets(hash);
last_bucket = bucket + Hash_num_buckets(hash);
current_arity = (int *) malloc(sizeof(int) * (arity[0] + 1));
memcpy(current_arity, arity, sizeof(int) * (arity[0] + 1));
do {
if (*bucket) {
traverse_global_trie(*bucket, str, str_index, arity, mode, TRAVERSE_POSITION_FIRST);
memcpy(arity, current_arity, sizeof(int) * (current_arity[0] + 1));
#ifdef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -2 && str[str_index - 1] != '[')
str[str_index - 1] = ',';
#else
if (arity[arity[0]] == -1)
str[str_index - 1] = '|';
#endif /* TRIE_COMPACT_PAIRS */
}
} while (++bucket != last_bucket);
free(current_arity);
return;
}
/* save current state if first sibling node */
if (position == TRAVERSE_POSITION_FIRST) {
current_arity = (int *) malloc(sizeof(int) * (arity[0] + 1));
memcpy(current_arity, arity, sizeof(int) * (arity[0] + 1));
current_str_index = str_index;
current_mode = mode;
}
/* process current trie node */
TrStat_gt_nodes++;
traverse_trie_node(TrNode_entry(current_node), str, &str_index, arity, &mode, TRAVERSE_TYPE_SUBGOAL);
/* continue with child node ... */
if (arity[0] != 0)
traverse_global_trie(TrNode_child(current_node), str, str_index, arity, mode, TRAVERSE_POSITION_FIRST);
/* ... or show term */
else {
TrStat_gt_terms++;
str[str_index] = 0;
SHOW_TABLE_STRUCTURE(" TERM (x%ld): %s\n", (unsigned long int) TrNode_child(current_node), str);
}
/* restore the initial state and continue with sibling nodes */
if (position == TRAVERSE_POSITION_FIRST) {
str_index = current_str_index;
mode = current_mode;
current_node = TrNode_next(current_node);
while (current_node) {
memcpy(arity, current_arity, sizeof(int) * (current_arity[0] + 1));
#ifdef TRIE_COMPACT_PAIRS
if (arity[arity[0]] == -2 && str[str_index - 1] != '[')
str[str_index - 1] = ',';
#else
if (arity[arity[0]] == -1)
str[str_index - 1] = '|';
#endif /* TRIE_COMPACT_PAIRS */
traverse_global_trie(current_node, str, str_index, arity, mode, TRAVERSE_POSITION_NEXT);
current_node = TrNode_next(current_node);
}
free(current_arity);
}
return;
}
static
void traverse_global_trie_for_subgoal(gt_node_ptr current_node, char *str, int *str_index, int *arity, int *mode) {
if (TrNode_parent(current_node) != GLOBAL_root_gt)
traverse_global_trie_for_subgoal(TrNode_parent(current_node), str, str_index, arity, mode);
traverse_trie_node(TrNode_entry(current_node), str, str_index, arity, mode, TRAVERSE_TYPE_SUBGOAL);
return;
}
static
void traverse_global_trie_for_answer(gt_node_ptr current_node, char *str, int *str_index, int *arity, int *mode) {
if (TrNode_parent(current_node) != GLOBAL_root_gt)
traverse_global_trie_for_answer(TrNode_parent(current_node), str, str_index, arity, mode);
traverse_trie_node(TrNode_entry(current_node), str, str_index, arity, mode, TRAVERSE_TYPE_ANSWER);
return;
}
#endif /* GLOBAL_TRIE */
#endif /* TABLING */
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