This repository has been archived on 2023-08-20. You can view files and clone it, but cannot push or open issues or pull requests.
yap-6.3/H/TermExt.h

619 lines
16 KiB
C
Raw Normal View History

/*************************************************************************
* *
* YAP Prolog %W% %G% *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: TermExt.h *
* mods: *
* comments: Extensions to standard terms for YAP *
* version: $Id: TermExt.h,v 1.15 2008-03-25 22:03:13 vsc Exp $ *
*************************************************************************/
2014-09-11 20:06:57 +01:00
/**
@file TermExt.h
*/
#ifdef USE_SYSTEM_MALLOC
#define SF_STORE (&(Yap_heap_regs->funcs))
#else
#define SF_STORE ((special_functors *)HEAP_INIT_BASE)
#endif
2016-08-03 00:28:02 +01:00
#if 1
extern Atom AtomFoundVar, AtomFreeTerm, AtomNil, AtomDot;
#elif defined(USE_OFFSETS)
#define AtomFoundVar ((Atom)(&(((special_functors *)(NULL))->AtFoundVar)))
#define AtomFreeTerm ((Atom)(&(((special_functors *)(NULL))->AtFreeTerm)))
#define AtomNil ((Atom)(&(((special_functors *)(NULL))->AtNil)))
#define AtomDot ((Atom)(&(((special_functors *)(NULL))->AtDot)))
2015-03-16 17:25:09 +00:00
#elif OLD_STYLE_INITIAL_ATOMS
#define AtomFoundVar AbsAtom((AtomEntry *)&(SF_STORE->AtFoundVar))
#define AtomFreeTerm AbsAtom((AtomEntry *)&(SF_STORE->AtFreeTerm))
#define AtomNil AbsAtom((AtomEntry *)&(SF_STORE->AtNil))
#define AtomDot AbsAtom((AtomEntry *)&(SF_STORE->AtDot))
2015-03-16 17:25:09 +00:00
#else
#define AtomFoundVar AbsAtom(SF_STORE->AtFoundVar)
#define AtomFreeTerm AbsAtom(SF_STORE->AtFreeTerm)
#define AtomNil AbsAtom(SF_STORE->AtNil)
#define AtomDot AbsAtom(SF_STORE->AtDot)
#endif
#define TermFoundVar MkAtomTerm(AtomFoundVar)
#define TermFreeTerm MkAtomTerm(AtomFreeTerm)
#define TermNil MkAtomTerm(AtomNil)
#define TermDot MkAtomTerm(AtomDot)
typedef enum {
db_ref_e = sizeof(Functor *),
attvar_e = 2 * sizeof(Functor *),
double_e = 3 * sizeof(Functor *),
long_int_e = 4 * sizeof(Functor *),
big_int_e = 5 * sizeof(Functor *),
string_e = 6 * sizeof(Functor *)
} blob_type;
#define FunctorDBRef ((Functor)(db_ref_e))
#define FunctorAttVar ((Functor)(attvar_e))
#define FunctorDouble ((Functor)(double_e))
#define FunctorLongInt ((Functor)(long_int_e))
#define FunctorBigInt ((Functor)(big_int_e))
#define FunctorString ((Functor)(string_e))
#define EndSpecials (string_e + sizeof(Functor *))
2012-06-29 22:44:08 +01:00
#include "inline-only.h"
2011-11-02 22:55:42 +00:00
#define IsAttVar(pt) __IsAttVar((pt)PASS_REGS)
INLINE_ONLY inline EXTERN int __IsAttVar(CELL *pt USES_REGS);
2010-03-08 09:24:11 +00:00
INLINE_ONLY inline EXTERN int __IsAttVar(CELL *pt USES_REGS) {
#ifdef YAP_H
return (pt)[-1] == (CELL)attvar_e && pt < HR;
2011-11-02 22:55:42 +00:00
#else
return (pt)[-1] == (CELL)attvar_e;
#endif
2010-03-08 09:24:11 +00:00
}
INLINE_ONLY inline EXTERN int GlobalIsAttVar(CELL *pt);
INLINE_ONLY inline EXTERN int GlobalIsAttVar(CELL *pt) {
2011-03-18 19:34:58 +00:00
return (pt)[-1] == (CELL)attvar_e;
}
typedef enum {
BIG_INT = 0x01,
BIG_RATIONAL = 0x02,
BIG_FLOAT = 0x04,
EMPTY_ARENA = 0x10,
ARRAY_INT = 0x21,
ARRAY_FLOAT = 0x22,
CLAUSE_LIST = 0x40,
EXTERNAL_BLOB = 0x100, /* generic data */
USER_BLOB_START = 0x1000, /* user defined blob */
USER_BLOB_END = 0x1100 /* end of user defined blob */
} big_blob_type;
INLINE_ONLY inline EXTERN blob_type BlobOfFunctor(Functor f);
INLINE_ONLY inline EXTERN blob_type BlobOfFunctor(Functor f) {
return (blob_type)((CELL)f);
}
typedef struct cp_frame {
CELL *start_cp;
CELL *end_cp;
CELL *to;
#ifdef RATIONAL_TREES
CELL oldv;
int ground;
#endif
} copy_frame;
#ifdef COROUTINING
typedef struct {
/* what to do when someone tries to bind our term to someone else
in some predefined context */
void (*bind_op)(Term *, Term CACHE_TYPE);
/* what to do if someone wants to copy our constraint */
int (*copy_term_op)(CELL *, struct cp_frame **, CELL *CACHE_TYPE);
/* copy the constraint into a term and back */
Term (*to_term_op)(CELL *);
int (*term_to_op)(Term, Term CACHE_TYPE);
/* op called to do marking in GC */
void (*mark_op)(CELL *);
} ext_op;
/* known delays */
typedef enum {
empty_ext = 0 * sizeof(ext_op), /* default op, this should never be called */
attvars_ext = 1 * sizeof(ext_op) /* support for attributed variables */
/* add your own extensions here */
/* keep this one */
} exts;
#endif
2015-02-09 01:53:28 +00:00
#if defined(YAP_H)
/* make sure that these data structures are the first thing to be allocated
in the heap when we start the system */
typedef struct special_functors_struct {
2015-03-16 17:25:09 +00:00
#if 0
2015-02-09 01:53:28 +00:00
struct ExtraAtomEntryStruct AtFoundVar;
struct ExtraAtomEntryStruct AtFreeTerm;
struct ExtraAtomEntryStruct AtNil;
struct ExtraAtomEntryStruct AtDot;
2015-03-16 17:25:09 +00:00
#else
struct AtomEntryStruct *AtFoundVar;
struct AtomEntryStruct *AtFreeTerm;
struct AtomEntryStruct *AtNil;
struct AtomEntryStruct *AtDot;
#endif
} special_functors;
#endif /* YAP_H */
INLINE_ONLY inline EXTERN Float CpFloatUnaligned(CELL *ptr);
#define MkFloatTerm(fl) __MkFloatTerm((fl)PASS_REGS)
2011-11-02 22:55:42 +00:00
INLINE_ONLY inline EXTERN Term __MkFloatTerm(Float USES_REGS);
INLINE_ONLY inline EXTERN Float FloatOfTerm(Term t);
2014-01-23 01:46:16 +00:00
#if SIZEOF_DOUBLE == SIZEOF_INT_P
INLINE_ONLY inline EXTERN Term __MkFloatTerm(Float dbl USES_REGS) {
return (Term)((HR[0] = (CELL)FunctorDouble, *(Float *)(HR + 1) = dbl,
HR[2] = EndSpecials, HR += 3, AbsAppl(HR - 3)));
}
INLINE_ONLY inline EXTERN Float FloatOfTerm(Term t) {
return (Float)(*(Float *)(RepAppl(t) + 1));
}
#define InitUnalignedFloat()
INLINE_ONLY inline EXTERN Float CpFloatUnaligned(CELL *ptr) {
return *((Float *)ptr);
}
#else
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
#define DOUBLE_ALIGNED(ADDR) ((CELL)(ADDR)&0x4)
INLINE_ONLY EXTERN inline void AlignGlobalForDouble(USES_REGS1);
2013-09-04 11:05:01 +01:00
INLINE_ONLY EXTERN inline void AlignGlobalForDouble(USES_REGS1) {
2013-09-04 11:05:01 +01:00
/* Force Alignment for floats. Note that garbage collector may
break the alignment; */
2014-01-19 21:15:05 +00:00
if (!DOUBLE_ALIGNED(HR)) {
RESET_VARIABLE(HR);
HR++;
2013-09-04 11:05:01 +01:00
}
}
#ifdef i386
INLINE_ONLY inline EXTERN Float CpFloatUnaligned(CELL *ptr) {
return *((Float *)(ptr + 1));
}
#else
/* first, need to address the alignment problem */
INLINE_ONLY inline EXTERN Float CpFloatUnaligned(CELL *ptr) {
union {
Float f;
CELL d[2];
} u;
u.d[0] = ptr[1];
u.d[1] = ptr[2];
return (u.f);
}
#endif
INLINE_ONLY inline EXTERN Term __MkFloatTerm(Float dbl USES_REGS) {
return (Term)((AlignGlobalForDouble(PASS_REGS1), HR[0] = (CELL)FunctorDouble,
*(Float *)(HR + 1) = dbl, HR[3] = EndSpecials, HR += 4,
AbsAppl(HR - 4)));
}
INLINE_ONLY inline EXTERN Float FloatOfTerm(Term t) {
return (Float)((DOUBLE_ALIGNED(RepAppl(t)) ? *(Float *)(RepAppl(t) + 1)
: CpFloatUnaligned(RepAppl(t))));
}
/* no alignment problems for 64 bit machines */
#else
/* OOPS, YAP only understands Floats that are as large as cells or that
take two cells!!! */
OOPS
#endif
#endif
#ifndef YAP_H
#include <stddef.h>
#endif
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsFloatTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsFloatTerm(Term t) {
return (int)(IsApplTerm(t) && FunctorOfTerm(t) == FunctorDouble);
}
/* extern Functor FunctorLongInt; */
#define MkLongIntTerm(i) __MkLongIntTerm((i)PASS_REGS)
INLINE_ONLY inline EXTERN Term __MkLongIntTerm(Int USES_REGS);
INLINE_ONLY inline EXTERN Term __MkLongIntTerm(Int i USES_REGS) {
HR[0] = (CELL)FunctorLongInt;
HR[1] = (CELL)(i);
HR[2] = EndSpecials;
2014-01-19 21:15:05 +00:00
HR += 3;
return AbsAppl(HR - 3);
}
INLINE_ONLY inline EXTERN Int LongIntOfTerm(Term t);
2011-11-02 22:55:42 +00:00
INLINE_ONLY inline EXTERN Int LongIntOfTerm(Term t) {
return (Int)(RepAppl(t)[1]);
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsLongIntTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsLongIntTerm(Term t) {
return IsApplTerm(t) &&
FunctorOfTerm(t) == FunctorLongInt;
}
/****************************************************/
/*********** strings, coded as UTF-8 ****************/
#include <string.h>
/* extern Functor FunctorString; */
#define MkStringTerm(i) __MkStringTerm((i)PASS_REGS)
INLINE_ONLY inline EXTERN Term __MkStringTerm(const char *s USES_REGS);
INLINE_ONLY inline EXTERN Term __MkStringTerm(const char *s USES_REGS) {
2014-01-19 21:15:05 +00:00
Term t = AbsAppl(HR);
size_t sz = ALIGN_BY_TYPE(strlen((char *)s) + 1, CELL);
HR[0] = (CELL)FunctorString;
HR[1] = (CELL)sz;
strcpy((char *)(HR + 2), (const char *)s);
HR[2 + sz] = EndSpecials;
HR += 3 + sz;
return t;
}
#define MkUStringTerm(i) __MkUStringTerm((i)PASS_REGS)
INLINE_ONLY inline EXTERN Term
__MkUStringTerm(const unsigned char *s USES_REGS);
2015-09-21 23:05:36 +01:00
INLINE_ONLY inline EXTERN Term
__MkUStringTerm(const unsigned char *s USES_REGS) {
2015-09-21 23:05:36 +01:00
Term t = AbsAppl(HR);
size_t sz = ALIGN_BY_TYPE(strlen((char *)s) + 1, CELL);
HR[0] = (CELL)FunctorString;
HR[1] = (CELL)sz;
strcpy((char *)(HR + 2), (const char *)s);
HR[2 + sz] = EndSpecials;
HR += 3 + sz;
2015-09-21 23:05:36 +01:00
return t;
}
INLINE_ONLY inline EXTERN const unsigned char *UStringOfTerm(Term t);
2015-09-21 23:05:36 +01:00
INLINE_ONLY inline EXTERN const unsigned char *UStringOfTerm(Term t) {
return (const unsigned char *)(RepAppl(t) + 2);
2015-09-21 23:05:36 +01:00
}
INLINE_ONLY inline EXTERN const char *StringOfTerm(Term t);
INLINE_ONLY inline EXTERN const char *StringOfTerm(Term t) {
return (const char *)(RepAppl(t) + 2);
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsStringTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsStringTerm(Term t) {
return IsApplTerm(t) &&
FunctorOfTerm(t) == FunctorString;
}
/****************************************************/
#ifdef USE_GMP
#include <stdio.h>
2016-04-12 16:22:53 +01:00
#if !defined(__cplusplus)
#include <gmp.h>
2015-02-03 02:36:51 +00:00
#endif
#else
typedef UInt mp_limb_t;
typedef struct {
Int _mp_size, _mp_alloc;
mp_limb_t *_mp_d;
} MP_INT;
2010-05-27 12:24:15 +01:00
typedef struct {
MP_INT _mp_num;
MP_INT _mp_den;
} MP_RAT;
#endif
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsBigIntTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsBigIntTerm(Term t) {
return IsApplTerm(t) &&
FunctorOfTerm(t) == FunctorBigInt;
}
#ifdef USE_GMP
2013-04-25 23:15:04 +01:00
Term Yap_MkBigIntTerm(MP_INT *);
MP_INT *Yap_BigIntOfTerm(Term);
2013-04-25 23:15:04 +01:00
Term Yap_MkBigRatTerm(MP_RAT *);
MP_RAT *Yap_BigRatOfTerm(Term);
2010-05-27 12:24:15 +01:00
INLINE_ONLY inline EXTERN void MPZ_SET(mpz_t, MP_INT *);
INLINE_ONLY inline EXTERN void MPZ_SET(mpz_t dest, MP_INT *src) {
dest->_mp_size = src->_mp_size;
dest->_mp_alloc = src->_mp_alloc;
dest->_mp_d = src->_mp_d;
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsLargeIntTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsLargeIntTerm(Term t) {
return IsApplTerm(t) &&
((FunctorOfTerm(t) <= FunctorBigInt) &&
(FunctorOfTerm(t) >= FunctorLongInt));
}
INLINE_ONLY inline EXTERN UInt Yap_SizeOfBigInt(Term);
INLINE_ONLY inline EXTERN UInt Yap_SizeOfBigInt(Term t) {
CELL *pt = RepAppl(t) + 1;
return 2 +
(sizeof(MP_INT) + (((MP_INT *)pt)->_mp_alloc * sizeof(mp_limb_t))) /
sizeof(CELL);
}
#else
INLINE_ONLY inline EXTERN int IsLargeIntTerm(Term);
INLINE_ONLY inline EXTERN int IsLargeIntTerm(Term t) {
return (int)(IsApplTerm(t) && FunctorOfTerm(t) == FunctorLongInt);
}
#endif
/* extern Functor FunctorLongInt; */
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsLargeNumTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsLargeNumTerm(Term t) {
return IsApplTerm(t) &&
((FunctorOfTerm(t) <= FunctorBigInt) &&
(FunctorOfTerm(t) >= FunctorDouble));
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsExternalBlobTerm(Term, CELL);
2011-07-21 10:24:21 +01:00
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsExternalBlobTerm(Term t, CELL tag) {
return IsApplTerm(t) &&
FunctorOfTerm(t) == FunctorBigInt &&
RepAppl(t)[1] == tag;
2011-07-21 10:24:21 +01:00
}
INLINE_ONLY inline EXTERN void *ExternalBlobFromTerm(Term);
2011-07-21 10:24:21 +01:00
INLINE_ONLY inline EXTERN void *ExternalBlobFromTerm(Term t) {
MP_INT *base = (MP_INT *)(RepAppl(t) + 2);
return (void *)(base + 1);
2011-07-21 10:24:21 +01:00
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsNumTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsNumTerm(Term t) {
return (IsIntTerm(t) || IsLargeNumTerm(t));
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsAtomicTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsAtomicTerm(Term t) {
return IsAtomOrIntTerm(t) ||
IsLargeNumTerm(t) ||
IsStringTerm(t);
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsExtensionFunctor(Functor);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsExtensionFunctor(Functor f) {
return f <= FunctorString;
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsBlobFunctor(Functor);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsBlobFunctor(Functor f) {
return (f <= FunctorString &&
f >= FunctorDBRef);
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsPrimitiveTerm(Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsPrimitiveTerm(Term t) {
return (IsAtomOrIntTerm(t) ||
(IsApplTerm(t) &&
IsBlobFunctor(FunctorOfTerm(t))));
}
#ifdef TERM_EXTENSIONS
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsAttachFunc(Functor);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool IsAttachFunc(Functor f) { return (Int)(FALSE); }
#define IsAttachedTerm(t) __IsAttachedTerm(t PASS_REGS)
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool __IsAttachedTerm(Term USES_REGS);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool __IsAttachedTerm(Term t USES_REGS) {
return (IsVarTerm(t) &&
IsAttVar(VarOfTerm(t)));
}
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool GlobalIsAttachedTerm(Term);
2011-03-18 19:34:58 +00:00
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool GlobalIsAttachedTerm(Term t) {
return (IsVarTerm(t) &&
GlobalIsAttVar(VarOfTerm(t)));
2011-03-18 19:34:58 +00:00
}
#define SafeIsAttachedTerm(t) __SafeIsAttachedTerm((t)PASS_REGS)
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool __SafeIsAttachedTerm(Term USES_REGS);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool __SafeIsAttachedTerm(Term t USES_REGS) {
return IsVarTerm(t) && IsAttVar(VarOfTerm(t));
}
INLINE_ONLY inline EXTERN exts ExtFromCell(CELL *);
INLINE_ONLY inline EXTERN exts ExtFromCell(CELL *pt) { return attvars_ext; }
#else
INLINE_ONLY inline EXTERN Int IsAttachFunc(Functor);
INLINE_ONLY inline EXTERN Int IsAttachFunc(Functor f) { return (Int)(FALSE); }
INLINE_ONLY inline EXTERN Int IsAttachedTerm(Term);
INLINE_ONLY inline EXTERN Int IsAttachedTerm(Term t) { return (Int)(FALSE); }
#endif
INLINE_ONLY inline EXTERN Int Yap_BlobTag(Term t);
INLINE_ONLY inline EXTERN Int Yap_BlobTag(Term t) {
CELL *pt = RepAppl(t);
return pt[1];
}
INLINE_ONLY inline EXTERN void *Yap_BlobInfo(Term t);
INLINE_ONLY inline EXTERN void *Yap_BlobInfo(Term t) {
MP_INT *blobp;
CELL *pt = RepAppl(t);
blobp = (MP_INT *)(pt + 2);
return (void *)(blobp + 1);
}
#ifdef YAP_H
2011-11-02 22:55:42 +00:00
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool unify_extension(Functor, CELL, CELL *, CELL);
2016-07-31 16:31:22 +01:00
EXTERN bool unify_extension(Functor, CELL, CELL *, CELL);
int Yap_gmp_tcmp_big_big(Term, Term);
2016-07-31 16:31:22 +01:00
INLINE_ONLY inline EXTERN bool unify_extension(Functor f, CELL d0, CELL *pt0,
CELL d1) {
switch (BlobOfFunctor(f)) {
case db_ref_e:
return (d0 == d1);
case attvar_e:
return (d0 == d1);
case long_int_e:
return (pt0[1] == RepAppl(d1)[1]);
case string_e:
return strcmp((char *)(pt0 + 2), (char *)(RepAppl(d1) + 2)) == 0;
case big_int_e:
#ifdef USE_GMP
return (Yap_gmp_tcmp_big_big(d0, d1) == 0);
#else
return d0 == d1;
#endif /* USE_GMP */
case double_e: {
CELL *pt1 = RepAppl(d1);
return (pt0[1] == pt1[1]
#if SIZEOF_DOUBLE == 2 * SIZEOF_INT_P
&& pt0[2] == pt1[2]
#endif
);
}
}
2016-07-31 16:31:22 +01:00
return false;
}
static inline CELL Yap_IntP_key(CELL *pt) {
#ifdef USE_GMP
if (((Functor)pt[-1] == FunctorBigInt)) {
MP_INT *b1 = Yap_BigIntOfTerm(AbsAppl(pt - 1));
/* first cell in program */
CELL val = ((CELL *)(b1 + 1))[0];
return MkIntTerm(val & (MAX_ABS_INT - 1));
}
#endif
return MkIntTerm(pt[0] & (MAX_ABS_INT - 1));
}
static inline CELL Yap_Int_key(Term t) { return Yap_IntP_key(RepAppl(t) + 1); }
static inline CELL Yap_DoubleP_key(CELL *pt) {
#if SIZEOF_DOUBLE1 == 2 * SIZEOF_INT_P
CELL val = pt[0] ^ pt[1];
#else
CELL val = pt[0];
#endif
return MkIntTerm(val & (MAX_ABS_INT - 1));
}
static inline CELL Yap_Double_key(Term t) {
return Yap_DoubleP_key(RepAppl(t) + 1);
}
static inline CELL Yap_StringP_key(CELL *pt) {
UInt n = pt[1], i;
CELL val = pt[2];
for (i = 1; i < n; i++) {
val ^= pt[i + 1];
}
return MkIntTerm(val & (MAX_ABS_INT - 1));
}
static inline CELL Yap_String_key(Term t) {
return Yap_StringP_key(RepAppl(t) + 1);
}
2011-11-02 22:55:42 +00:00
#endif