488 lines
13 KiB
C
488 lines
13 KiB
C
/*************************************************************************
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* *
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* YAP Prolog %W% %G% *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: clause.h *
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* Last rev: *
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* mods: *
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* comments: clause info *
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* *
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*************************************************************************/
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#ifndef CLAUSE_H
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#define CLAUSE_H 1
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#include "Yatom.h"
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#include "YapHeap.h"
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/* consulting files */
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typedef union CONSULT_OBJ {
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const unsigned char *filename;
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int mode;
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Prop p;
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UInt c;
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} consult_obj;
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/* Either we are assembling clauses or indexing code */
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#define ASSEMBLING_CLAUSE 0
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#define ASSEMBLING_INDEX 1
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#define ASSEMBLING_EINDEX 2
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#define NextDynamicClause(X) (((yamop *)X)->y_u.Otapl.d)
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#define PredFirstClause 0
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#define PredMiddleClause 1
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#define PredLastClause 2
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typedef struct logic_upd_index {
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CELL ClFlags;
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UInt ClRefCount;
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#if defined(YAPOR) || defined(THREADS)
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/* A lock for manipulating the clause */
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// lockvar ClLock;
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#endif
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UInt ClSize;
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struct logic_upd_index *ParentIndex;
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struct logic_upd_index *SiblingIndex;
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struct logic_upd_index *PrevSiblingIndex;
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struct logic_upd_index *ChildIndex;
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/* The instructions, at least one of the form sl */
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PredEntry *ClPred;
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yamop ClCode[MIN_ARRAY];
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} LogUpdIndex;
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/* The ordering of the first 3 fields should be compatible with dbrefs */
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typedef struct logic_upd_clause {
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Functor Id; /* allow pointers to this struct to id */
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/* as dbref */
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/* A set of flags describing info on the clause */
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/* A set of flags describing info on the clause */
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CELL ClFlags;
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#if defined(YAPOR) || defined(THREADS)
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/* A lock for manipulating the clause */
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// lockvar ClLock;
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#endif
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UInt ClSize;
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/* extra clause information for logical update indices and facts */
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/* indices that may still backtrack to this clause */
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UInt ClRefCount;
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/* data for clauses with environments */
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yamop *ClExt;
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union {
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DBTerm *ClSource;
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Int ClLine;
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} lusl;
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/* doubly linked list of clauses */
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struct logic_upd_clause *ClPrev, *ClNext;
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/* parent pointer */
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PredEntry *ClPred;
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UInt ClTimeStart, ClTimeEnd;
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/* The instructions, at least one of the form sl */
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yamop ClCode[MIN_ARRAY];
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} LogUpdClause;
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#include "inline-only.h"
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INLINE_ONLY inline EXTERN int VALID_TIMESTAMP(UInt, struct logic_upd_clause *);
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INLINE_ONLY inline EXTERN int
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VALID_TIMESTAMP(UInt timestamp, struct logic_upd_clause *cl)
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{
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return IN_BETWEEN(cl->ClTimeStart, timestamp, cl->ClTimeEnd);
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}
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typedef struct dynamic_clause {
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/* A set of flags describing info on the clause */
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CELL ClFlags;
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#if defined(YAPOR) || defined(THREADS)
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/* A lock for manipulating the clause */
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lockvar ClLock;
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#endif
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UInt ClSize;
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Int ClLine;
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UInt ClRefCount;
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yamop *ClPrevious; /* immediate update clause */
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/* The instructions, at least one of the form sl */
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yamop ClCode[MIN_ARRAY];
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} DynamicClause;
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typedef struct static_index {
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/* A set of flags describing info on the clause */
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CELL ClFlags;
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UInt ClSize;
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struct static_index *SiblingIndex;
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struct static_index *ChildIndex;
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/* The instructions, at least one of the form sl */
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PredEntry *ClPred;
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yamop ClCode[MIN_ARRAY];
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} StaticIndex;
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typedef struct static_clause {
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/* A set of flags describing info on the clause */
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CELL ClFlags;
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UInt ClSize;
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union {
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DBTerm *ClSource;
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Int ClLine;
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} usc;
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struct static_clause *ClNext;
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/* The instructions, at least one of the form sl */
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yamop ClCode[MIN_ARRAY];
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} StaticClause;
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typedef struct static_mega_clause {
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/* A set of flags describing info on the clause */
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CELL ClFlags;
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UInt ClSize;
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PredEntry *ClPred;
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UInt ClItemSize;
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Int ClLine;
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struct static_mega_clause *ClNext;
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/* The instructions, at least one of the form sl */
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yamop ClCode[MIN_ARRAY];
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} MegaClause;
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typedef union clause_obj {
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struct logic_upd_clause luc;
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struct logic_upd_index lui;
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struct dynamic_clause ic;
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struct static_clause sc;
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struct static_mega_clause mc;
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struct static_index si;
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} ClauseUnion;
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typedef union clause_ptr {
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struct logic_upd_clause *luc;
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struct logic_upd_index *lui;
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struct dynamic_clause *ic;
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struct static_clause *sc;
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struct static_mega_clause *mc;
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struct static_index *si;
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} ClausePointer;
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typedef struct index_t {
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struct index_t *next, *prev;
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UInt nels;
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UInt arity;
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PredEntry *ap;
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CELL bmap;
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int is_key;
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int is_udi;
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UInt ncollisions;
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UInt max_col_count;
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UInt ntrys;
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UInt nentries;
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UInt hsize;
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BITS32 *key;
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CELL *cls, *bcls;
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BITS32 *links;
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size_t size;
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yamop *code;
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BITS32 *udi_data;
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void *udi_first, *udi_next;
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UInt udi_free_args;
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UInt udi_arg;
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} Index_t;
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INLINE_ONLY EXTERN inline BITS32 EXO_ADDRESS_TO_OFFSET(struct index_t *it, CELL *ptr);
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INLINE_ONLY EXTERN inline BITS32
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EXO_ADDRESS_TO_OFFSET(struct index_t *it, CELL* ptr)
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{
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return (ptr-it->cls)/it->arity+1;
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}
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INLINE_ONLY EXTERN inline CELL *EXO_OFFSET_TO_ADDRESS(struct index_t *it, BITS32 off);
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INLINE_ONLY EXTERN inline CELL *
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EXO_OFFSET_TO_ADDRESS(struct index_t *it, BITS32 off)
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{
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if (off == 0L)
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return (CELL *)NULL;
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return (it->cls)+(off-1)*it->arity;
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}
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INLINE_ONLY EXTERN inline BITS32 ADDRESS_TO_LINK(struct index_t *it, BITS32 *ptr);
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INLINE_ONLY EXTERN inline BITS32
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ADDRESS_TO_LINK(struct index_t *it, BITS32* ptr)
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{
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return ptr-it->links;
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}
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INLINE_ONLY EXTERN inline BITS32 *LINK_TO_ADDRESS(struct index_t *it, BITS32 off);
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INLINE_ONLY EXTERN inline BITS32 *
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LINK_TO_ADDRESS(struct index_t *it, BITS32 off)
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{
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return it->links+off;
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}
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typedef void (*CRefitExoIndex)(struct index_t **ip, UInt b[] USES_REGS);
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typedef yamop * (*CEnterExoIndex)(struct index_t *it USES_REGS);
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typedef int (*CRetryExoIndex)(struct index_t *it USES_REGS);
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typedef struct dbterm_list {
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/* a list of dbterms associated with a clause */
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DBTerm *dbterms;
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yamop *clause_code;
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PredEntry *p;
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struct dbterm_list *next_dbl;
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} DBTermList;
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#define ClauseCodeToDynamicClause(p) ((DynamicClause *)((CODEADDR)(p)-(CELL)(((DynamicClause *)NULL)->ClCode)))
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#define ClauseCodeToStaticClause(p) ((StaticClause *)((CODEADDR)(p)-(CELL)(((StaticClause *)NULL)->ClCode)))
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#define ClauseCodeToLogUpdClause(p) ((LogUpdClause *)((CODEADDR)(p)-(CELL)(((LogUpdClause *)NULL)->ClCode)))
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#define ClauseCodeToMegaClause(p) ((MegaClause *)((CODEADDR)(p)-(CELL)(((MegaClause *)NULL)->ClCode)))
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#define ClauseCodeToLogUpdIndex(p) ((LogUpdIndex *)((CODEADDR)(p)-(CELL)(((LogUpdIndex *)NULL)->ClCode)))
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#define ClauseCodeToStaticIndex(p) ((StaticIndex *)((CODEADDR)(p)-(CELL)(((StaticIndex *)NULL)->ClCode)))
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#define ClauseFlagsToDynamicClause(p) ((DynamicClause *)(p))
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#define ClauseFlagsToLogUpdClause(p) ((LogUpdClause *)((CODEADDR)(p)-(CELL)(&(((LogUpdClause *)NULL)->ClFlags))))
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#define ClauseFlagsToLogUpdIndex(p) ((LogUpdIndex *)((CODEADDR)(p)-(CELL)(&(((LogUpdIndex *)NULL)->ClFlags))))
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#define ClauseFlagsToStaticClause(p) ((StaticClause *)(p))
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#define DynamicFlags(X) (ClauseCodeToDynamicClause(X)->ClFlags)
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#define DynamicLock(X) (ClauseCodeToDynamicClause(X)->ClLock)
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#if MULTIPLE_STACKS
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#define INIT_CLREF_COUNT(X) (X)->ClRefCount = 0
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#define INC_CLREF_COUNT(X) (X)->ClRefCount++
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#define DEC_CLREF_COUNT(X) (X)->ClRefCount--
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#define CL_IN_USE(X) ((X)->ClRefCount)
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#else
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#define INIT_CLREF_COUNT(X)
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#define INC_CLREF_COUNT(X)
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#define DEC_CLREF_COUNT(X)
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#define CL_IN_USE(X) ((X)->ClFlags & InUseMask || (X)->ClRefCount)
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#endif
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/* amasm.c */
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wamreg Yap_emit_x(CELL);
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COUNT Yap_compile_cmp_flags(PredEntry *);
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void Yap_InitComma(void);
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/* cdmgr.c */
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void Yap_IPred(PredEntry *, UInt, yamop *);
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int Yap_addclause(Term,yamop *,int,Term,Term*);
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void Yap_add_logupd_clause(PredEntry *,LogUpdClause *,int);
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void Yap_kill_iblock(ClauseUnion *,ClauseUnion *,PredEntry *);
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void Yap_EraseStaticClause(StaticClause *, PredEntry *, Term);
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ClauseUnion *Yap_find_owner_index(yamop *, PredEntry *);
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/* dbase.c */
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void Yap_ErCl(DynamicClause *);
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void Yap_ErLogUpdCl(LogUpdClause *);
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void Yap_ErLogUpdIndex(LogUpdIndex *);
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Int Yap_Recordz(Atom, Term);
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Int Yap_db_nth_recorded( PredEntry *, Int USES_REGS );
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Int Yap_unify_immediate_ref(DBRef ref USES_REGS );
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/* exec.c */
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Term Yap_cp_as_integer(choiceptr);
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/* index.c */
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yamop *Yap_PredIsIndexable(PredEntry *, UInt, yamop *);
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yamop *Yap_ExpandIndex(PredEntry *, UInt);
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void Yap_CleanUpIndex(struct logic_upd_index *);
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void Yap_CleanKids(struct logic_upd_index *);
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void Yap_AddClauseToIndex(PredEntry *,yamop *,int);
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void Yap_RemoveClauseFromIndex(PredEntry *,yamop *);
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LogUpdClause *Yap_NthClause(PredEntry *,Int);
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LogUpdClause *Yap_FollowIndexingCode(PredEntry *,yamop *, Term *, yamop *,yamop *);
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/* exo.c */
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yamop *Yap_ExoLookup(PredEntry *ap USES_REGS);
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CELL Yap_NextExo(choiceptr cpt, struct index_t *it);
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#
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#if USE_THREADED_CODE
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#define OP_HASH_SIZE 2048
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INLINE_ONLY inline EXTERN int rtable_hash_op(OPCODE opc, int hash_mask);
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INLINE_ONLY inline EXTERN int
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rtable_hash_op(OPCODE opc, int hash_mask) {
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return((((CELL)opc) >> 3) & hash_mask);
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}
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INLINE_ONLY inline EXTERN op_numbers Yap_op_from_opcode(OPCODE opc);
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/* given an opcode find the corresponding opnumber. This should make
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switches on ops a much easier operation */
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INLINE_ONLY inline EXTERN op_numbers
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Yap_op_from_opcode(OPCODE opc)
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{
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int j = rtable_hash_op(opc,OP_HASH_SIZE-1);
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while (OP_RTABLE[j].opc != opc) {
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if (!OP_RTABLE[j].opc)
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return _Nstop;
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if (j == OP_HASH_SIZE-1) {
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j = 0;
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} else {
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j++;
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}
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}
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return OP_RTABLE[j].opnum;
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}
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#else
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static inline op_numbers
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Yap_op_from_opcode(OPCODE opc)
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{
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return((op_numbers)opc);
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}
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#endif /* USE_THREADED_CODE */
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#if defined(YAPOR) || defined(THREADS)
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static inline int same_lu_block(yamop **, yamop *);
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static inline int
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same_lu_block(yamop **paddr, yamop *p)
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{
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yamop *np = *paddr;
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if (np != p) {
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OPCODE jmp_op = Yap_opcode(_jump_if_nonvar);
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while (np->opc == jmp_op) {
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np = NEXTOP(np, xll);
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if (np == p) return TRUE;
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}
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return FALSE;
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} else {
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return TRUE;
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}
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}
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#endif
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#define Yap_MkStaticRefTerm(cp, ap) __Yap_MkStaticRefTerm((cp), (ap) PASS_REGS)
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static inline Term
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__Yap_MkStaticRefTerm(StaticClause *cp, PredEntry *ap USES_REGS)
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{
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Term t[2];
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t[0] = MkIntegerTerm((Int)cp);
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t[1] = MkIntegerTerm((Int)ap);
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return Yap_MkApplTerm(FunctorStaticClause,2,t);
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}
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static inline StaticClause *
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Yap_ClauseFromTerm(Term t)
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{
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return (StaticClause *)IntegerOfTerm(ArgOfTerm(1,t));
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}
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#define Yap_MkMegaRefTerm(ap, ipc) __Yap_MkMegaRefTerm((ap), (ipc) PASS_REGS)
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static inline Term
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__Yap_MkMegaRefTerm(PredEntry *ap,yamop *ipc USES_REGS)
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{
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Term t[2];
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t[0] = MkIntegerTerm((Int)ap);
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t[1] = MkIntegerTerm((Int)ipc);
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return Yap_MkApplTerm(FunctorMegaClause,2,t);
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}
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static inline yamop *
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Yap_MegaClauseFromTerm(Term t)
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{
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return (yamop *)IntegerOfTerm(ArgOfTerm(2,t));
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}
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static inline PredEntry *
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Yap_MegaClausePredicateFromTerm(Term t)
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{
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return (PredEntry *)IntegerOfTerm(ArgOfTerm(1,t));
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}
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#define Yap_MkExoRefTerm(ap, i) __Yap_MkExoRefTerm((ap), (i) PASS_REGS)
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static inline Term
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__Yap_MkExoRefTerm(PredEntry *ap,Int i USES_REGS)
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{
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Term t[2];
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t[0] = MkIntegerTerm((Int)ap);
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t[1] = MkIntegerTerm((Int)i);
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return Yap_MkApplTerm(FunctorExoClause,2,t);
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}
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static inline Int
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Yap_ExoClauseFromTerm(Term t)
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{
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return IntegerOfTerm(ArgOfTerm(2,t));
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}
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static inline PredEntry *
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Yap_ExoClausePredicateFromTerm(Term t)
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{
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return (PredEntry *)IntegerOfTerm(ArgOfTerm(1,t));
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}
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/******************************************************************
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EXECUTING PROLOG CLAUSES
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******************************************************************/
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bool
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Yap_search_for_static_predicate_in_use(PredEntry *p, bool check_everything);
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static inline bool
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Yap_static_in_use(PredEntry *p, bool check_everything)
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{
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#if defined(YAPOR) || defined(THREADS)
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return TRUE;
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#else
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pred_flags_t pflags = p->PredFlags;
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if (pflags & (DynamicPredFlag|LogUpdatePredFlag)) {
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return FALSE;
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}
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if (STATIC_PREDICATES_MARKED) {
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return (p->PredFlags & InUsePredFlag);
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} else {
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/* This code does not work for YAPOR or THREADS!!!!!!!! */
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return Yap_search_for_static_predicate_in_use(p, check_everything);
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}
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#endif
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#define DEAD_REF(ref) FALSE
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}
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typedef enum {
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FIND_PRED_FROM_ANYWHERE,
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FIND_PRED_FROM_CP,
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FIND_PRED_FROM_ENV
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} find_pred_type;
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Int Yap_PredForCode(yamop *, find_pred_type, Atom *, UInt *, Term *);
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PredEntry *Yap_PredEntryForCode(yamop *, find_pred_type, void* *, void* *);
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LogUpdClause *Yap_new_ludbe(Term, PredEntry *, UInt);
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Term Yap_LUInstance(LogUpdClause *, UInt);
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/* udi.c */
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int Yap_new_udi_clause(PredEntry *, yamop *, Term);
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yamop *Yap_udi_search(PredEntry *);
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Term Yap_bug_location(yamop *p, yamop *cp, choiceptr b_ptr, CELL *env);
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Term Yap_pc_location(yamop *p, choiceptr b_ptr, CELL *env);
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Term Yap_env_location(yamop *p, choiceptr b_ptr, CELL *env, Int ignore_first);
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#if LOW_PROF
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void Yap_InformOfRemoval(void *);
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void Yap_dump_code_area_for_profiler(void);
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#else
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#define Yap_InformOfRemoval(X)
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#endif
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#endif
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