352 lines
14 KiB
C
352 lines
14 KiB
C
/************************************************************************
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** **
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** The YapTab/YapOr/OPTYap systems **
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** **
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** YapTab extends the Yap Prolog engine to support sequential tabling **
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** YapOr extends the Yap Prolog engine to support or-parallelism **
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** OPTYap extends the Yap Prolog engine to support or-parallel tabling **
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** **
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** **
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** Yap Prolog was developed at University of Porto, Portugal **
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** **
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************************************************************************/
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/************************************************************************
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** Table Space Data Structures **
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************************************************************************/
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/**************************
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** table_entry **
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**************************/
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typedef struct table_entry {
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#if defined(YAPOR) || defined(THREADS)
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lockvar lock;
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#endif /* YAPOR || THREADS */
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struct pred_entry *pred_entry;
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Atom pred_atom;
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int pred_arity;
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short pred_flags;
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short execution_mode; /* combines yap_flags with pred_flags */
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struct subgoal_trie_node *subgoal_trie;
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struct subgoal_trie_hash *hash_chain;
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struct table_entry *next;
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} *tab_ent_ptr;
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#define TabEnt_lock(X) ((X)->lock)
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#define TabEnt_pe(X) ((X)->pred_entry)
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#define TabEnt_atom(X) ((X)->pred_atom)
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#define TabEnt_arity(X) ((X)->pred_arity)
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#define TabEnt_flags(X) ((X)->pred_flags)
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#define TabEnt_mode(X) ((X)->execution_mode)
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#define TabEnt_subgoal_trie(X) ((X)->subgoal_trie)
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#define TabEnt_hash_chain(X) ((X)->hash_chain)
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#define TabEnt_next(X) ((X)->next)
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/***********************************************************************
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** global_trie_node, subgoal_trie_node and answer_trie_node **
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***********************************************************************/
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#ifdef GLOBAL_TRIE
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typedef struct global_trie_node {
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Term entry;
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struct global_trie_node *parent;
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struct global_trie_node *child;
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struct global_trie_node *next;
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} *gt_node_ptr;
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#endif /* GLOBAL_TRIE */
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typedef struct subgoal_trie_node {
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Term entry;
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#ifdef TABLE_LOCK_AT_NODE_LEVEL
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lockvar lock;
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#endif /* TABLE_LOCK_AT_NODE_LEVEL */
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struct subgoal_trie_node *parent;
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struct subgoal_trie_node *child;
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struct subgoal_trie_node *next;
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} *sg_node_ptr;
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typedef struct answer_trie_node {
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OPCODE trie_instruction; /* u.opc */
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#ifdef YAPOR
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int or_arg; /* u.Otapl.or_arg */
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#endif /* YAPOR */
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Term entry;
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#ifdef TABLE_LOCK_AT_NODE_LEVEL
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lockvar lock;
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#endif /* TABLE_LOCK_AT_NODE_LEVEL */
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struct answer_trie_node *parent;
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struct answer_trie_node *child;
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struct answer_trie_node *next;
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} *ans_node_ptr;
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#define TrNode_instr(X) ((X)->trie_instruction)
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#define TrNode_or_arg(X) ((X)->or_arg)
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#define TrNode_entry(X) ((X)->entry)
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#define TrNode_lock(X) ((X)->lock)
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#define TrNode_parent(X) ((X)->parent)
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#define TrNode_child(X) ((X)->child)
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#define TrNode_sg_fr(X) ((X)->child)
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#define TrNode_next(X) ((X)->next)
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/***********************************************************************
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** global_trie_hash, subgoal_trie_hash and answer_trie_hash **
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***********************************************************************/
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#ifdef GLOBAL_TRIE
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typedef struct global_trie_hash {
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/* the first field is used for compatibility **
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** with the global_trie_node data structure */
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Term mark;
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int number_of_buckets;
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struct global_trie_node **buckets;
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int number_of_nodes;
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} *gt_hash_ptr;
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#endif /* GLOBAL_TRIE */
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typedef struct subgoal_trie_hash {
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/* the first field is used for compatibility **
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** with the subgoal_trie_node data structure */
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Term mark;
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int number_of_buckets;
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struct subgoal_trie_node **buckets;
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int number_of_nodes;
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struct subgoal_trie_hash *next;
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} *sg_hash_ptr;
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typedef struct answer_trie_hash {
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/* the first field is used for compatibility **
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** with the answer_trie_node data structure */
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OPCODE mark;
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int number_of_buckets;
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struct answer_trie_node **buckets;
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int number_of_nodes;
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struct answer_trie_hash *next;
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} *ans_hash_ptr;
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#define Hash_mark(X) ((X)->mark)
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#define Hash_num_buckets(X) ((X)->number_of_buckets)
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#define Hash_seed(X) ((X)->number_of_buckets - 1)
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#define Hash_buckets(X) ((X)->buckets)
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#define Hash_bucket(X,N) ((X)->buckets + N)
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#define Hash_num_nodes(X) ((X)->number_of_nodes)
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#define Hash_next(X) ((X)->next)
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/************************************************************************
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** Execution Data Structures **
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************************************************************************/
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/****************************
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** choice points **
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****************************/
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struct generator_choicept {
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struct choicept cp;
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struct dependency_frame *cp_dep_fr; /* always NULL if batched scheduling */
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struct subgoal_frame *cp_sg_fr;
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#ifdef LOW_LEVEL_TRACER
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struct pred_entry *cp_pred_entry;
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#endif /* LOW_LEVEL_TRACER */
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};
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#ifdef DETERMINISTIC_TABLING
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struct deterministic_generator_choicept {
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struct deterministic_choicept cp;
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struct subgoal_frame *cp_sg_fr;
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#ifdef LOW_LEVEL_TRACER
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struct pred_entry *cp_pred_entry;
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#endif /* LOW_LEVEL_TRACER */
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};
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#endif /* DETERMINISTIC_TABLING */
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struct consumer_choicept {
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struct choicept cp;
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struct dependency_frame *cp_dep_fr;
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#ifdef LOW_LEVEL_TRACER
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struct pred_entry *cp_pred_entry;
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#endif /* LOW_LEVEL_TRACER */
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};
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struct loader_choicept {
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struct choicept cp;
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struct answer_trie_node *cp_last_answer;
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#ifdef LOW_LEVEL_TRACER
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struct pred_entry *cp_pred_entry;
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#endif /* LOW_LEVEL_TRACER */
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};
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/****************************
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** subgoal_frame **
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****************************/
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typedef struct subgoal_frame {
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#if defined(YAPOR) || defined(THREADS)
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lockvar lock;
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#endif
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#ifdef YAPOR
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int generator_worker;
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struct or_frame *top_or_frame_on_generator_branch;
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#endif /* YAPOR */
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yamop *code_of_subgoal;
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enum { /* do not change order !!! */
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incomplete = 0, /* INCOMPLETE_TABLING */
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ready = 1,
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evaluating = 2,
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complete = 3,
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complete_in_use = 4, /* LIMIT_TABLING */
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compiled = 5,
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compiled_in_use = 6 /* LIMIT_TABLING */
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} state_flag;
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choiceptr generator_choice_point;
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struct answer_trie_hash *hash_chain;
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struct answer_trie_node *answer_trie;
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struct answer_trie_node *first_answer;
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struct answer_trie_node *last_answer;
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#ifdef INCOMPLETE_TABLING
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struct answer_trie_node *try_answer;
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#endif /* INCOMPLETE_TABLING */
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#ifdef LIMIT_TABLING
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struct subgoal_frame *previous;
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#endif /* LIMIT_TABLING */
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struct subgoal_frame *next;
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} *sg_fr_ptr;
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#define SgFr_lock(X) ((X)->lock)
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#define SgFr_gen_worker(X) ((X)->generator_worker)
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#define SgFr_gen_top_or_fr(X) ((X)->top_or_frame_on_generator_branch)
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#define SgFr_code(X) ((X)->code_of_subgoal)
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#define SgFr_tab_ent(X) (((X)->code_of_subgoal)->u.Otapl.te)
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#define SgFr_arity(X) (((X)->code_of_subgoal)->u.Otapl.s)
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#define SgFr_state(X) ((X)->state_flag)
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#define SgFr_gen_cp(X) ((X)->generator_choice_point)
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#define SgFr_hash_chain(X) ((X)->hash_chain)
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#define SgFr_answer_trie(X) ((X)->answer_trie)
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#define SgFr_first_answer(X) ((X)->first_answer)
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#define SgFr_last_answer(X) ((X)->last_answer)
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#define SgFr_try_answer(X) ((X)->try_answer)
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#define SgFr_previous(X) ((X)->previous)
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#define SgFr_next(X) ((X)->next)
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/**************************************************************************************************
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SgFr_lock: spin-lock to modify the frame fields.
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SgFr_gen_worker: the id of the worker that had allocated the frame.
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SgFr_gen_top_or_fr: a pointer to the top or-frame in the generator choice point branch.
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When the generator choice point is shared the pointer is updated
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to its or-frame. It is used to find the direct dependency node for
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consumer nodes in other workers branches.
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SgFr_code initial instruction of the subgoal's compiled code.
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SgFr_tab_ent a pointer to the correspondent table entry.
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SgFr_arity the arity of the subgoal.
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SgFr_state: a flag that indicates the subgoal state.
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SgFr_gen_cp: a pointer to the correspondent generator choice point.
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SgFr_hash_chain: a pointer to the first answer_trie_hash struct for the subgoal in hand.
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SgFr_answer_trie: a pointer to the top answer trie node.
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It is used to check for/insert new answers.
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SgFr_first_answer: a pointer to the bottom answer trie node of the first available answer.
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SgFr_last_answer: a pointer to the bottom answer trie node of the last available answer.
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SgFr_try_answer: a pointer to the bottom answer trie node of the last tried answer.
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It is used when a subgoal was not completed during the previous evaluation.
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Not completed subgoals start by trying the answers already found.
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SgFr_previous: a pointer to the previous subgoal frame on the chain.
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SgFr_next: a pointer to the next subgoal frame on the chain.
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**************************************************************************************************/
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/*******************************
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** dependency_frame **
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*******************************/
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typedef struct dependency_frame {
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#if defined(YAPOR) || defined(THREADS)
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lockvar lock;
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#endif /* YAPOR || THREADS */
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#ifdef YAPOR
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int leader_dependency_is_on_stack;
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struct or_frame *top_or_frame;
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#ifdef TIMESTAMP_CHECK
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long timestamp;
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#endif /* TIMESTAMP_CHECK */
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#endif /* YAPOR */
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choiceptr backchain_choice_point;
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choiceptr leader_choice_point;
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choiceptr consumer_choice_point;
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struct answer_trie_node *last_consumed_answer;
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struct dependency_frame *next;
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} *dep_fr_ptr;
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#define DepFr_lock(X) ((X)->lock)
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#define DepFr_leader_dep_is_on_stack(X) ((X)->leader_dependency_is_on_stack)
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#define DepFr_top_or_fr(X) ((X)->top_or_frame)
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#define DepFr_timestamp(X) ((X)->timestamp)
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#define DepFr_backchain_cp(X) ((X)->backchain_choice_point)
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#define DepFr_leader_cp(X) ((X)->leader_choice_point)
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#define DepFr_cons_cp(X) ((X)->consumer_choice_point)
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#define DepFr_last_answer(X) ((X)->last_consumed_answer)
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#define DepFr_next(X) ((X)->next)
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/*******************************************************************************************************
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DepFr_lock: lock variable to modify the frame fields.
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DepFr_leader_dep_is_on_stack: the generator choice point for the correspondent consumer choice point
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is on the worker's stack (FALSE/TRUE).
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DepFr_top_or_fr: a pointer to the top or-frame in the consumer choice point branch.
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When the consumer choice point is shared the pointer is updated to
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its or-frame. It is used to update the LOCAL_top_or_fr when a worker
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backtracks through answers.
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DepFr_timestamp: a timestamp used to optimize the search for suspension frames to be
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resumed.
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DepFr_backchain_cp: a pointer to the nearest choice point with untried alternatives.
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It is used to efficiently return (backtrack) to the leader node where
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we perform the last backtracking through answers operation.
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DepFr_leader_cp: a pointer to the leader choice point.
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DepFr_cons_cp: a pointer to the correspondent consumer choice point.
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DepFr_last_answer: a pointer to the last consumed answer.
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DepFr_next: a pointer to the next dependency frame on the chain.
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*******************************************************************************************************/
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/*******************************
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** suspension_frame **
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*******************************/
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#ifdef YAPOR
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typedef struct suspension_frame {
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struct or_frame *top_or_frame_on_stack;
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struct dependency_frame *top_dependency_frame;
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struct subgoal_frame *top_subgoal_frame;
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struct suspended_block {
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void *resume_register;
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void *block_start;
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long block_size;
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} global_block, local_block, trail_block;
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struct suspension_frame *next;
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} *susp_fr_ptr;
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#endif /* YAPOR */
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#define SuspFr_top_or_fr_on_stack(X) ((X)->top_or_frame_on_stack)
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#define SuspFr_top_dep_fr(X) ((X)->top_dependency_frame)
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#define SuspFr_top_sg_fr(X) ((X)->top_subgoal_frame)
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#define SuspFr_global_reg(X) ((X)->global_block.resume_register)
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#define SuspFr_global_start(X) ((X)->global_block.block_start)
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#define SuspFr_global_size(X) ((X)->global_block.block_size)
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#define SuspFr_local_reg(X) ((X)->local_block.resume_register)
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#define SuspFr_local_start(X) ((X)->local_block.block_start)
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#define SuspFr_local_size(X) ((X)->local_block.block_size)
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#define SuspFr_trail_reg(X) ((X)->trail_block.resume_register)
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#define SuspFr_trail_start(X) ((X)->trail_block.block_start)
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#define SuspFr_trail_size(X) ((X)->trail_block.block_size)
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#define SuspFr_next(X) ((X)->next)
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