392 lines
8.3 KiB
C
392 lines
8.3 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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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: arith1.c *
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* Last rev: *
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* mods: *
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* comments: bignum support through gmp *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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#include "Yap.h"
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#include "Yatom.h"
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef USE_GMP
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#include "YapHeap.h"
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#include "eval.h"
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#include "alloc.h"
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Term
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Yap_MkBigIntTerm(MP_INT *big)
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{
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CACHE_REGS
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Int nlimbs;
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MP_INT *dst = (MP_INT *)(H+2);
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CELL *ret = H;
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if (mpz_fits_slong_p(big)) {
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long int out = mpz_get_si(big);
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return MkIntegerTerm((Int)out);
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}
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nlimbs = (big->_mp_alloc)*(sizeof(mp_limb_t)/CellSize);
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if (nlimbs > (ASP-ret)-1024) {
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return TermNil;
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}
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H[0] = (CELL)FunctorBigInt;
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H[1] = BIG_INT;
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dst->_mp_size = big->_mp_size;
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dst->_mp_alloc = big->_mp_alloc;
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memmove((void *)(dst+1), (const void *)(big->_mp_d), nlimbs*CellSize);
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H = (CELL *)(dst+1)+nlimbs;
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H[0] = EndSpecials;
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H++;
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return AbsAppl(ret);
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}
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MP_INT *
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Yap_BigIntOfTerm(Term t)
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{
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MP_INT *new = (MP_INT *)(RepAppl(t)+2);
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new->_mp_d = (mp_limb_t *)(new+1);
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return(new);
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}
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Term
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Yap_MkBigRatTerm(MP_RAT *big)
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{
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CACHE_REGS
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Int nlimbs;
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MP_INT *dst = (MP_INT *)(H+2);
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MP_INT *num = mpq_numref(big);
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MP_INT *den = mpq_denref(big);
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MP_RAT *rat;
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CELL *ret = H;
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if (mpz_cmp_si(den, 1) == 0)
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return Yap_MkBigIntTerm(num);
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if ((num->_mp_alloc+den->_mp_alloc)*(sizeof(mp_limb_t)/CellSize) > (ASP-ret)-1024) {
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return TermNil;
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}
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H[0] = (CELL)FunctorBigInt;
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H[1] = BIG_RATIONAL;
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dst->_mp_size = 0;
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rat = (MP_RAT *)(dst+1);
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rat->_mp_num._mp_size = num->_mp_size;
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rat->_mp_num._mp_alloc = num->_mp_alloc;
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nlimbs = (num->_mp_alloc)*(sizeof(mp_limb_t)/CellSize);
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memmove((void *)(rat+1), (const void *)(num->_mp_d), nlimbs*CellSize);
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rat->_mp_den._mp_size = den->_mp_size;
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rat->_mp_den._mp_alloc = den->_mp_alloc;
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H = (CELL *)(rat+1)+nlimbs;
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nlimbs = (den->_mp_alloc)*(sizeof(mp_limb_t)/CellSize);
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memmove((void *)(H), (const void *)(den->_mp_d), nlimbs*CellSize);
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H += nlimbs;
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dst->_mp_alloc = (H-(CELL *)(dst+1));
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H[0] = EndSpecials;
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H++;
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return AbsAppl(ret);
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}
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MP_RAT *
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Yap_BigRatOfTerm(Term t)
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{
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MP_RAT *new = (MP_RAT *)(RepAppl(t)+2+sizeof(MP_INT)/sizeof(CELL));
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mp_limb_t *nt;
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nt = new->_mp_num._mp_d = (mp_limb_t *)(new+1);
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nt += new->_mp_num._mp_alloc;
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new->_mp_den._mp_d = nt;
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return new;
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}
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Term
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Yap_RatTermToApplTerm(Term t)
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{
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Term ts[2];
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MP_RAT *rat = Yap_BigRatOfTerm(t);
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ts[0] = Yap_MkBigIntTerm(mpq_numref(rat));
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ts[1] = Yap_MkBigIntTerm(mpq_denref(rat));
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return Yap_MkApplTerm(FunctorRDiv,2,ts);
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}
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#endif
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Term
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Yap_MkULLIntTerm(YAP_ULONG_LONG n)
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{
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#if __GNUC__ && USE_GMP
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mpz_t new;
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char tmp[256];
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Term t;
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#ifdef _WIN32
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snprintf(tmp,256,"%I64u",n);
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#elif HAVE_SNPRINTF
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snprintf(tmp,256,"%llu",n);
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#else
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sprintf(tmp,"%llu",n);
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#endif
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/* try to scan it as a bignum */
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mpz_init_set_str (new, tmp, 10);
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if (mpz_fits_slong_p(new)) {
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return MkIntegerTerm(mpz_get_si(new));
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}
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t = Yap_MkBigIntTerm(new);
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mpz_clear(new);
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return t;
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#else
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return MkIntegerTerm(n);
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#endif
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}
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static Int
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p_is_bignum( USES_REGS1 )
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{
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#ifdef USE_GMP
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Term t = Deref(ARG1);
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return(
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IsNonVarTerm(t) &&
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IsApplTerm(t) &&
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FunctorOfTerm(t) == FunctorBigInt &&
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RepAppl(t)[1] == BIG_INT
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);
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#else
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return FALSE;
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#endif
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}
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static Int
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p_has_bignums( USES_REGS1 )
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{
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#ifdef USE_GMP
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return TRUE;
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#else
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return FALSE;
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#endif
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}
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static Int
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p_is_rational( USES_REGS1 )
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{
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Term t = Deref(ARG1);
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if (IsVarTerm(t))
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return FALSE;
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if (IsIntTerm(t))
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return TRUE;
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if (IsApplTerm(t)) {
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Functor f = FunctorOfTerm(t);
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CELL *pt;
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if (f == FunctorLongInt)
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return TRUE;
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if (f != FunctorBigInt)
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return FALSE;
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pt = RepAppl(t);
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return ( pt[1] == BIG_RATIONAL || pt[1] == BIG_INT );
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}
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return FALSE;
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}
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static Int
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p_rational( USES_REGS1 )
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{
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#ifdef USE_GMP
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Term t = Deref(ARG1);
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Functor f;
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CELL *pt;
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MP_RAT *rat;
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Term t1, t2;
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if (IsVarTerm(t))
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return FALSE;
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if (!IsApplTerm(t))
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return FALSE;
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f = FunctorOfTerm(t);
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if (f != FunctorBigInt)
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return FALSE;
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pt = RepAppl(t);
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if (pt[1] != BIG_RATIONAL)
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return FALSE;
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rat = Yap_BigRatOfTerm(t);
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while ((t1 = Yap_MkBigIntTerm(mpq_numref(rat))) == TermNil ||
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(t2 = Yap_MkBigIntTerm(mpq_denref(rat))) == TermNil) {
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UInt size =
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(mpq_numref(rat)->_mp_alloc)*(sizeof(mp_limb_t)/CellSize) +
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(mpq_denref(rat)->_mp_alloc)*(sizeof(mp_limb_t)/CellSize);
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if (!Yap_gcl(size, 3, ENV, P)) {
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Yap_Error(OUT_OF_STACK_ERROR, t, LOCAL_ErrorMessage);
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return FALSE;
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}
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}
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return
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Yap_unify(ARG2, t1) &&
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Yap_unify(ARG3, t2);
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#else
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return FALSE;
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#endif
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}
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int
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Yap_IsStringTerm(Term t)
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{
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CELL fl;
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if (IsVarTerm(t))
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return FALSE;
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if (!IsApplTerm(t))
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return FALSE;
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if (FunctorOfTerm(t) != FunctorBigInt)
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return FALSE;
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fl = RepAppl(t)[1];
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return fl == BLOB_STRING || fl == BLOB_WIDE_STRING;
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}
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int
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Yap_IsWideStringTerm(Term t)
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{
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CELL fl;
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if (IsVarTerm(t))
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return FALSE;
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if (!IsApplTerm(t))
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return FALSE;
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if (FunctorOfTerm(t) != FunctorBigInt)
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return FALSE;
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fl = RepAppl(t)[1];
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return fl == BLOB_WIDE_STRING;
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}
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Term
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Yap_MkBlobStringTerm(const char *s, size_t len)
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{
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CACHE_REGS
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CELL *ret = H;
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size_t sz;
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MP_INT *dst = (MP_INT *)(H+2);
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blob_string_t *sp;
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size_t siz;
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char *dest;
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sz = strlen(s);
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if (len > 0 && sz > len) sz = len;
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if (len/sizeof(CELL) > (ASP-ret)-1024) {
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return TermNil;
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}
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H[0] = (CELL)FunctorBigInt;
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H[1] = BLOB_STRING;
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siz = ALIGN_YAPTYPE((len+1+sizeof(blob_string_t)),CELL);
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dst->_mp_size = 0L;
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dst->_mp_alloc = siz/sizeof(mp_limb_t);
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sp = (blob_string_t *)(dst+1);
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sp->len = sz;
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dest = (char *)(sp+1);
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strncpy(dest, s, sz);
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dest[sz] = '\0';
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H += (siz + 2*sizeof(CELL)+sizeof(MP_INT)+sizeof(Functor))/sizeof(CELL);
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H[-1] = EndSpecials;
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return AbsAppl(ret);
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}
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Term
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Yap_MkBlobWideStringTerm(const wchar_t *s, size_t len)
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{
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CACHE_REGS
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CELL *ret = H;
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size_t sz;
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MP_INT *dst = (MP_INT *)(H+2);
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blob_string_t *sp = (blob_string_t *)(dst+1);
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size_t siz, i = 0;
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H[0] = (CELL)FunctorBigInt;
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dst->_mp_size = 0L;
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sz = wcslen(s);
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if (len > 0 && sz > len) {
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sz = len;
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}
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if ((len/sizeof(CELL)) > (ASP-ret)-1024) {
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return TermNil;
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}
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while (i < sz) {
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if (s[i++] >= 255) break;
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}
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if (i == sz) {
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/* we have a standard ascii string */
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char *target;
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size_t i = 0;
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H[1] = BLOB_STRING;
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siz = ALIGN_YAPTYPE((sz+1+sizeof(blob_string_t)),CELL);
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dst->_mp_alloc = siz/sizeof(mp_limb_t);
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sp->len = sz;
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target = (char *)(sp+1);
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for (i = 0 ; i < sz; i++) {
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target[i] = s[i];
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}
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target[sz] = '\0';
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H += (siz+2*sizeof(CELL)+sizeof(MP_INT)+sizeof(Functor))/sizeof(CELL);
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} else {
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wchar_t * target;
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H[1] = BLOB_WIDE_STRING;
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siz = ALIGN_YAPTYPE((sz+1)*sizeof(wchar_t)+sizeof(blob_string_t),CELL);
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dst->_mp_alloc = siz/sizeof(mp_limb_t);
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sp->len = sz;
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target = (wchar_t *)(sp+1);
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wcsncpy(target, s, sz);
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target[sz] = '\0';
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H += (siz + 2*sizeof(CELL)+sizeof(MP_INT)+sizeof(Functor))/sizeof(CELL);
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}
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H[-1] = EndSpecials;
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return AbsAppl(ret);
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}
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char *
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Yap_BlobStringOfTerm(Term t)
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{
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blob_string_t *new = (blob_string_t *)(RepAppl(t)+2+sizeof(MP_INT)/sizeof(CELL));
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return (char *)(new+1);
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}
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wchar_t *
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Yap_BlobWideStringOfTerm(Term t)
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{
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blob_string_t *new = (blob_string_t *)(RepAppl(t)+2+sizeof(MP_INT)/sizeof(CELL));
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return (wchar_t *)(new+1);
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}
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char *
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Yap_BlobStringOfTermAndLength(Term t, size_t *sp)
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{
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blob_string_t *new = (blob_string_t *)(RepAppl(t)+2+sizeof(MP_INT)/sizeof(CELL));
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*sp = new->len;
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return (char *)(new+1);
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}
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void
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Yap_InitBigNums(void)
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{
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Yap_InitCPred("$has_bignums", 0, p_has_bignums, SafePredFlag|HiddenPredFlag);
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Yap_InitCPred("$bignum", 1, p_is_bignum, SafePredFlag|HiddenPredFlag);
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Yap_InitCPred("rational", 3, p_rational, 0);
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Yap_InitCPred("rational", 1, p_is_rational, SafePredFlag);
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}
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