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yap-6.3/C/utilpreds.c

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/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: utilpreds.c *
* Last rev: 4/03/88 *
* mods: *
* comments: new utility predicates for YAP *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "@(#)utilpreds.c 1.3";
#endif
#include "Yap.h"
#include "clause.h"
#include "YapHeap.h"
#include "yapio.h"
#include "eval.h"
#include "attvar.h"
#ifdef HAVE_STRING_H
#include "string.h"
#endif
typedef struct {
Term old_var;
Term new_var;
} *vcell;
STATIC_PROTO(int copy_complex_term, (CELL *, CELL *, int, int, CELL *, CELL *));
STATIC_PROTO(CELL vars_in_complex_term, (CELL *, CELL *, Term));
STATIC_PROTO(Int p_non_singletons_in_term, (void));
STATIC_PROTO(CELL non_singletons_in_complex_term, (CELL *, CELL *));
STATIC_PROTO(Int p_variables_in_term, (void));
STATIC_PROTO(Int ground_complex_term, (CELL *, CELL *));
STATIC_PROTO(Int p_ground, (void));
STATIC_PROTO(Int p_copy_term, (void));
STATIC_PROTO(Int var_in_complex_term, (CELL *, CELL *, Term));
#ifdef DEBUG
STATIC_PROTO(Int p_force_trail_expansion, (void));
#endif /* DEBUG */
static inline void
clean_tr(tr_fr_ptr TR0) {
if (TR != TR0) {
do {
Term p = TrailTerm(--TR);
RESET_VARIABLE(p);
} while (TR != TR0);
}
}
static inline void
clean_dirty_tr(tr_fr_ptr TR0) {
if (TR != TR0) {
tr_fr_ptr pt = TR0;
do {
Term p = TrailTerm(pt++);
RESET_VARIABLE(p);
} while (pt != TR);
TR = TR0;
}
}
static int
copy_complex_term(CELL *pt0, CELL *pt0_end, int share, int newattvs, CELL *ptf, CELL *HLow)
{
struct cp_frame *to_visit0, *to_visit = (struct cp_frame *)Yap_PreAllocCodeSpace();
CELL *HB0 = HB;
tr_fr_ptr TR0 = TR;
int ground = TRUE;
#ifdef COROUTINING
CELL *dvarsmin = NULL, *dvarsmax=NULL;
#endif
HB = HLow;
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, copy_term_unk);
copy_term_nvar:
{
if (IsPairTerm(d0)) {
CELL *ap2 = RepPair(d0);
if (ap2 >= HB && ap2 < H) {
/* If this is newer than the current term, just reuse */
*ptf++ = d0;
continue;
}
*ptf = AbsPair(H);
ptf++;
#ifdef RATIONAL_TREES
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->oldv = *pt0;
to_visit->ground = ground;
/* fool the system into thinking we had a variable there */
*pt0 = AbsPair(H);
to_visit ++;
#else
if (pt0 < pt0_end) {
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->ground = ground;
to_visit ++;
}
#endif
ground = TRUE;
pt0 = ap2 - 1;
pt0_end = ap2 + 1;
ptf = H;
H += 2;
if (H > ASP - 2048) {
goto overflow;
}
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
if (ap2 >= HB && ap2 <= H) {
/* If this is newer than the current term, just reuse */
*ptf++ = d0;
continue;
}
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
#if defined(YAPOR) || defined(THREADS)
if (f == FunctorDBRef) {
DBRef entryref = DBRefOfTerm(d0);
if (entryref->Flags & LogUpdMask) {
LogUpdClause *luclause = (LogUpdClause *)entryref;
LOCK(luclause->ClPred->PELock);
UNLOCK(luclause->ClPred->PELock);
} else {
LOCK(entryref->lock);
TRAIL_REF(entryref); /* So that fail will erase it */
INC_DBREF_COUNT(entryref);
UNLOCK(entryref->lock);
}
*ptf++ = d0; /* you can just copy other extensions. */
} else
#endif
if (!share) {
UInt sz;
*ptf++ = AbsAppl(H); /* you can just copy other extensions. */
/* make sure to copy floats */
if (f== FunctorDouble) {
sz = sizeof(Float)/sizeof(CELL)+2;
} else if (f== FunctorLongInt) {
sz = 3;
} else {
CELL *pt = ap2+1;
sz = 2+sizeof(MP_INT)+(((MP_INT *)(pt+1))->_mp_alloc*sizeof(mp_limb_t));
}
if (H+sz > ASP - 2048) {
goto overflow;
}
memcpy((void *)H, (void *)ap2, sz*sizeof(CELL));
H += sz;
} else {
*ptf++ = d0; /* you can just copy other extensions. */
}
continue;
}
*ptf = AbsAppl(H);
ptf++;
/* store the terms to visit */
#ifdef RATIONAL_TREES
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->oldv = *pt0;
to_visit->ground = ground;
/* fool the system into thinking we had a variable there */
*pt0 = AbsAppl(H);
to_visit ++;
#else
if (pt0 < pt0_end) {
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->ground = ground;
to_visit ++;
}
#endif
ground = (f != FunctorMutable);
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
/* store the functor for the new term */
H[0] = (CELL)f;
ptf = H+1;
H += 1+d0;
if (H > ASP - 2048) {
goto overflow;
}
} else {
/* just copy atoms or integers */
*ptf++ = d0;
}
continue;
}
derefa_body(d0, ptd0, copy_term_unk, copy_term_nvar);
ground = FALSE;
if (ptd0 >= HLow && ptd0 < H) {
/* we have already found this cell */
*ptf++ = (CELL) ptd0;
} else {
#if COROUTINING
if (newattvs && IsAttachedTerm((CELL)ptd0)) {
/* if unbound, call the standard copy term routine */
struct cp_frame *bp;
if (IN_BETWEEN(dvarsmin, ptd0, dvarsmax)) {
*ptf++ = (CELL) ptd0;
} else {
CELL new;
bp = to_visit;
if (!attas[ExtFromCell(ptd0)].copy_term_op(ptd0, &bp, ptf)) {
goto overflow;
}
to_visit = bp;
new = *ptf;
Bind(ptd0, new);
if (dvarsmin == NULL) {
dvarsmin = CellPtr(new);
} else {
*dvarsmax = (CELL)(CellPtr(new)+1);
}
dvarsmax = CellPtr(new)+1;
ptf++;
}
} else {
#endif
/* first time we met this term */
RESET_VARIABLE(ptf);
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
/* Trail overflow */
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
Bind(ptd0, (CELL)ptf);
ptf++;
#ifdef COROUTINING
}
#endif
}
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
to_visit --;
if (ground && share) {
CELL old = to_visit->oldv;
CELL *newp = to_visit->to-1;
CELL new = *newp;
*newp = old;
if (IsApplTerm(new))
H = RepAppl(new);
else
H = RepPair(new);
}
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
#ifdef RATIONAL_TREES
*pt0 = to_visit->oldv;
#endif
ground = (ground && to_visit->ground);
goto loop;
}
/* restore our nice, friendly, term to its original state */
clean_dirty_tr(TR0);
close_attvar_chain(dvarsmin, dvarsmax);
HB = HB0;
return ground;
overflow:
/* oops, we're in trouble */
H = HLow;
/* we've done it */
/* restore our nice, friendly, term to its original state */
HB = HB0;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
*pt0 = to_visit->oldv;
}
#endif
reset_trail(TR0);
/* follow chain of multi-assigned variables */
reset_attvars(dvarsmin, dvarsmax);
return -1;
trail_overflow:
/* oops, we're in trouble */
H = HLow;
/* we've done it */
/* restore our nice, friendly, term to its original state */
HB = HB0;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
*pt0 = to_visit->oldv;
}
#endif
{
tr_fr_ptr oTR = TR;
reset_trail(TR0);
reset_attvars(dvarsmin, dvarsmax);
if (!Yap_growtrail((oTR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
return -4;
}
return -2;
}
heap_overflow:
/* oops, we're in trouble */
H = HLow;
/* we've done it */
/* restore our nice, friendly, term to its original state */
HB = HB0;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
*pt0 = to_visit->oldv;
}
#endif
reset_trail(TR0);
reset_attvars(dvarsmin, dvarsmax);
Yap_Error_Size = (ADDR)AuxSp-(ADDR)to_visit0;
return -3;
}
static Term
handle_cp_overflow(int res, tr_fr_ptr TR0, UInt arity, Term t)
{
XREGS[arity+1] = t;
switch(res) {
case -1:
if (!Yap_gcl((ASP-H)*sizeof(CELL), arity+1, ENV, gc_P(P,CP))) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
return 0L;
}
return Deref(XREGS[arity+1]);
case -2:
return Deref(XREGS[arity+1]);
case -3:
{
UInt size = Yap_Error_Size;
Yap_Error_Size = 0L;
if (size > 4*1024*1024)
size = 4*1024*1024;
if (!Yap_ExpandPreAllocCodeSpace(size, NULL, TRUE)) {
Yap_Error(OUT_OF_AUXSPACE_ERROR, TermNil, Yap_ErrorMessage);
return 0L;
}
}
return Deref(XREGS[arity+1]);
case -4:
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), FALSE)) {
Yap_Error(OUT_OF_TRAIL_ERROR, TermNil, Yap_ErrorMessage);
return 0L;
}
return Deref(XREGS[arity+1]);
default:
return 0L;
}
}
static Term
CopyTerm(Term inp, UInt arity, int share, int newattvs) {
Term t = Deref(inp);
tr_fr_ptr TR0 = TR;
if (IsVarTerm(t)) {
#if COROUTINING
if (newattvs && IsAttachedTerm(t)) {
CELL *Hi;
int res;
restart_attached:
*H = t;
Hi = H+1;
H += 2;
if ((res = copy_complex_term(Hi-2, Hi-1, share, newattvs, Hi, Hi)) < 0) {
H = Hi-1;
if ((t = handle_cp_overflow(res, TR0, arity, t))== 0L)
return FALSE;
goto restart_attached;
}
return Hi[0];
}
#endif
return MkVarTerm();
} else if (IsPrimitiveTerm(t)) {
return t;
} else if (IsPairTerm(t)) {
Term tf;
CELL *ap;
CELL *Hi;
restart_list:
ap = RepPair(t);
Hi = H;
tf = AbsPair(H);
H += 2;
{
int res;
if ((res = copy_complex_term(ap-1, ap+1, share, newattvs, Hi, Hi)) < 0) {
H = Hi;
if ((t = handle_cp_overflow(res, TR0, arity, t))== 0L)
return FALSE;
goto restart_list;
} else if (res && share) {
H = Hi;
return t;
}
}
return tf;
} else {
Functor f = FunctorOfTerm(t);
Term tf;
CELL *HB0;
CELL *ap;
restart_appl:
f = FunctorOfTerm(t);
HB0 = H;
ap = RepAppl(t);
tf = AbsAppl(H);
H[0] = (CELL)f;
H += 1+ArityOfFunctor(f);
if (H > ASP-128) {
H = HB0;
if ((t = handle_cp_overflow(-1, TR0, arity, t))== 0L)
return FALSE;
goto restart_appl;
} else {
int res;
if ((res = copy_complex_term(ap, ap+ArityOfFunctor(f), share, newattvs, HB0+1, HB0)) < 0) {
H = HB0;
if ((t = handle_cp_overflow(res, TR0, arity, t))== 0L)
return FALSE;
goto restart_appl;
} else if (res && share && FunctorOfTerm(t) != FunctorMutable) {
H = HB0;
return t;
}
}
return tf;
}
}
Term
Yap_CopyTerm(Term inp) {
return CopyTerm(inp, 0, TRUE, TRUE);
}
Term
Yap_CopyTermNoShare(Term inp) {
return CopyTerm(inp, 0, FALSE, FALSE);
}
static Int
p_copy_term(void) /* copy term t to a new instance */
{
Term t = CopyTerm(ARG1, 2, TRUE, TRUE);
if (t == 0L)
return FALSE;
/* be careful, there may be a stack shift here */
return Yap_unify(ARG2,t);
}
static Int
p_duplicate_term(void) /* copy term t to a new instance */
{
Term t = CopyTerm(ARG1, 2, FALSE, TRUE);
if (t == 0L)
return FALSE;
/* be careful, there may be a stack shift here */
return Yap_unify(ARG2,t);
}
static Int
p_copy_term_no_delays(void) /* copy term t to a new instance */
{
Term t = CopyTerm(ARG1, 2, TRUE, FALSE);
if (t == 0L) {
return FALSE;
}
/* be careful, there may be a stack shift here */
return(Yap_unify(ARG2,t));
}
/*
FAST EXPORT ROUTINE. Export a Prolog term to something like:
CELL 0: offset for start of term
CELL 1: size of actual term (to be copied to stack)
CELL 2: the original term (just for reference)
Atoms and functors:
- atoms are either:
0 and a char *string
-1 and a wchar_t *string
- functors are a CELL with arity and a string.
Compiled Term.
*/
static inline
CELL *CellDifH(CELL *hptr, CELL *hlow)
{
return (CELL *)((char *)hptr-(char *)hlow);
}
#define AdjustSizeAtom(X) ((char *)(((CELL)X+7) & (CELL)(-8)))
static inline
Atom export_atom(Atom at, char **hpp, size_t len)
{
char *ptr, *p0;
size_t sz;
ptr = *hpp;
ptr = AdjustSizeAtom(ptr);
p0 = ptr;
if (IsWideAtom(at)) {
wchar_t *wptr = (wchar_t *)ptr;
*wptr++ = -1;
sz = wcslen(RepAtom(at)->WStrOfAE);
if (sizeof(wchar_t)*(sz+1) >= len)
return (Atom)NULL;
wcsncpy(wptr, RepAtom(at)->WStrOfAE, len);
*hpp = (char *)(wptr+(sz+1));
} else {
*ptr++ = 0;
sz = strlen(RepAtom(at)->StrOfAE);
if (sz +1 >= len)
return (Atom)NULL;
strcpy(ptr, RepAtom(at)->StrOfAE);
*hpp = ptr+(sz+1);
}
ptr += sz;
return (Atom)p0;
}
static inline
Functor export_functor(Functor f, char **hpp, size_t len)
{
CELL *hptr = (UInt *)AdjustSizeAtom(*hpp);
UInt arity = ArityOfFunctor(f);
if (2*sizeof(CELL) >= len)
return (Functor)NULL;
hptr[0] = arity;
*hpp = (char *)(hptr+1);
if (!export_atom(NameOfFunctor(f), hpp, len))
return 0L;
return (Functor)hptr;
}
#define export_derefa_body(D,A,LabelUnk,LabelNonVar) \
do { \
if ((CELL *)(D) < CellDifH(H,HLow)) { (A) = (CELL *)(D); break; } \
(A) = (CELL *)(D); \
(D) = *(CELL *)(D); \
if(!IsVarTerm(D)) goto LabelNonVar; \
LabelUnk: ; \
} while (Unsigned(A) != (D))
static int
export_term_to_buffer(Term inpt, char *buf, char *bptr, CELL *t0 , CELL *tf, size_t len)
{
char *td = bptr;
CELL *bf = (CELL *)buf;
if (buf + len < (char *)(td + (tf-t0)))
return FALSE;
memcpy((void *)td, (void *)t0, (tf-t0)* sizeof(CELL));
bf[0] = (td-buf);
bf[1] = (tf-t0);
bf[2] = inpt;
return bf[0]+sizeof(CELL)*bf[1];
}
static int
export_complex_term(Term tf, CELL *pt0, CELL *pt0_end, char * buf, size_t len0, int newattvs, CELL *ptf, CELL *HLow)
{
struct cp_frame *to_visit0, *to_visit = (struct cp_frame *)Yap_PreAllocCodeSpace();
CELL *HB0 = HB;
tr_fr_ptr TR0 = TR;
int ground = TRUE;
#ifdef COROUTINING
CELL *dvarsmin = NULL, *dvarsmax=NULL;
#endif
char *bptr = buf+ 3*sizeof(CELL);
size_t len = len0;
HB = HLow;
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, export_term_unk);
export_term_nvar:
{
if (IsPairTerm(d0)) {
CELL *ap2 = RepPair(d0);
if (ap2 < CellDifH(H,HLow)) {
/* If this is newer than the current term, just reuse */
*ptf++ = d0;
continue;
}
*ptf = AbsPair(CellDifH(H,HLow));
ptf++;
#ifdef RATIONAL_TREES
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->oldv = *pt0;
to_visit->ground = ground;
/* fool the system into thinking we had a variable there */
*pt0 = AbsPair(CellDifH(H,HLow));
to_visit ++;
#else
if (pt0 < pt0_end) {
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->ground = ground;
to_visit ++;
}
#endif
pt0 = ap2 - 1;
pt0_end = ap2 + 1;
ptf = H;
H += 2;
if (H > ASP - 2048) {
goto overflow;
}
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
if (ap2 < CellDifH(H,HLow)) {
/* If this is newer than the current term, just reuse */
*ptf++ = d0;
continue;
}
f = (Functor)(*ap2);
*ptf++ = AbsAppl(CellDifH(H,HLow));
if (IsExtensionFunctor(f)) {
UInt sz;
/* make sure to export floats */
if (f== FunctorDouble) {
sz = sizeof(Float)/sizeof(CELL)+2;
} else if (f== FunctorLongInt) {
sz = 3;
} else {
CELL *pt = ap2+1;
sz = 2+sizeof(MP_INT)+(((MP_INT *)(pt+1))->_mp_alloc*sizeof(mp_limb_t));
}
if (H+sz > ASP - 2048) {
goto overflow;
}
memcpy((void *)H, (void *)ap2, sz*sizeof(CELL));
H += sz;
continue;
}
/* store the terms to visit */
#ifdef RATIONAL_TREES
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->oldv = *pt0;
to_visit->ground = ground;
/* fool the system into thinking we had a variable there */
*pt0 = AbsAppl(H);
to_visit ++;
#else
if (pt0 < pt0_end) {
if (to_visit+1 >= (struct cp_frame *)AuxSp) {
goto heap_overflow;
}
to_visit->start_cp = pt0;
to_visit->end_cp = pt0_end;
to_visit->to = ptf;
to_visit->ground = ground;
to_visit ++;
}
#endif
ground = (f != FunctorMutable);
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
/* store the functor for the new term */
ptf = H+1;
H += 1+d0;
if (H > ASP - 2048) {
goto overflow;
}
ptf[-1] = (CELL)export_functor(f, &bptr, len);
len = len0 - (bptr-buf);
if (H > ASP - 2048) {
goto overflow;
}
} else {
if (IsAtomTerm(d0)) {
*ptf = MkAtomTerm(export_atom(AtomOfTerm(d0), &bptr, len));
ptf++;
len = len0 - (bptr-buf);
} else {
*ptf++ = d0;
}
}
continue;
}
export_derefa_body(d0, ptd0, export_term_unk, export_term_nvar);
ground = FALSE;
if (ptd0 < CellDifH(H,HLow)) {
/* we have already found this cell */
*ptf++ = (CELL) ptd0;
} else {
#if COROUTINING
if (newattvs && IsAttachedTerm((CELL)ptd0) && FALSE) {
/* if unbound, call the standard export term routine */
struct cp_frame *bp;
if (IN_BETWEEN(dvarsmin, ptd0, dvarsmax)) {
*ptf++ = (CELL) ptd0;
} else {
CELL new;
bp = to_visit;
if (!attas[ExtFromCell(ptd0)].copy_term_op(ptd0, &bp, ptf)) {
goto overflow;
}
to_visit = bp;
new = *ptf;
Bind(ptd0, new);
if (dvarsmin == NULL) {
dvarsmin = CellPtr(new);
} else {
*dvarsmax = (CELL)(CellPtr(new)+1);
}
dvarsmax = CellPtr(new)+1;
ptf++;
}
} else {
#endif
/* first time we met this term */
*ptf = (CELL)CellDifH(ptf,HLow);
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
/* Trail overflow */
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
Bind(ptd0, (CELL)ptf);
ptf++;
#ifdef COROUTINING
}
#endif
}
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
#ifdef RATIONAL_TREES
*pt0 = to_visit->oldv;
#endif
ground = (ground && to_visit->ground);
goto loop;
}
/* restore our nice, friendly, term to its original state */
clean_dirty_tr(TR0);
close_attvar_chain(dvarsmin, dvarsmax);
HB = HB0;
return export_term_to_buffer(tf, buf, bptr, HLow, H, len0);
overflow:
/* oops, we're in trouble */
H = HLow;
/* we've done it */
/* restore our nice, friendly, term to its original state */
HB = HB0;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
*pt0 = to_visit->oldv;
}
#endif
reset_trail(TR0);
/* follow chain of multi-assigned variables */
reset_attvars(dvarsmin, dvarsmax);
return -1;
trail_overflow:
/* oops, we're in trouble */
H = HLow;
/* we've done it */
/* restore our nice, friendly, term to its original state */
HB = HB0;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
*pt0 = to_visit->oldv;
}
#endif
{
tr_fr_ptr oTR = TR;
reset_trail(TR0);
reset_attvars(dvarsmin, dvarsmax);
if (!Yap_growtrail((oTR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
return -4;
}
return -2;
}
heap_overflow:
/* oops, we're in trouble */
H = HLow;
/* we've done it */
/* restore our nice, friendly, term to its original state */
HB = HB0;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit --;
pt0 = to_visit->start_cp;
pt0_end = to_visit->end_cp;
ptf = to_visit->to;
*pt0 = to_visit->oldv;
}
#endif
reset_trail(TR0);
reset_attvars(dvarsmin, dvarsmax);
Yap_Error_Size = (ADDR)AuxSp-(ADDR)to_visit0;
return -3;
}
static int
ExportTerm(Term inp, char * buf, size_t len, UInt arity, int newattvs) {
Term t = Deref(inp);
tr_fr_ptr TR0 = TR;
int res;
CELL *Hi;
restart:
Hi = H;
if ((res = export_complex_term(inp, &t-1, &t, buf, len, newattvs, Hi, Hi)) < 0) {
H = Hi;
if ((t = handle_cp_overflow(res, TR0, arity, t))== 0L)
return FALSE;
goto restart;
}
return res;
}
int
Yap_ExportTerm(Term inp, char * buf, size_t len) {
return ExportTerm(inp, buf, len, 0, TRUE);
}
static CELL *
ShiftPtr(CELL t, char *base)
{
return (CELL *)(base+t);
}
static Atom
AddAtom(Atom t)
{
char *s = (char *)t;
if (!*s) {
return Yap_LookupAtom(s+1);
} else {
wchar_t *w = (wchar_t *)s;
return Yap_LookupWideAtom(w+1);
}
}
static UInt
FetchFunctor(CELL *pt)
{
CELL *ptr = (CELL *)(*pt);
// do arity first
UInt arity = *ptr;
char *name;
// and then an atom
++ptr;
name = (char *)ptr;
name = AdjustSizeAtom(name);
*pt = (CELL)Yap_MkFunctor(AddAtom((Atom)name), arity);
return arity;
}
static CELL *import_compound(CELL *hp, char *abase, CELL *amax);
static CELL *import_pair(CELL *hp, char *abase, CELL *amax);
static CELL *
import_arg(CELL *hp, char *abase, CELL *amax)
{
Term t = *hp;
if (IsVarTerm(t)) {
hp[0] = (CELL)ShiftPtr(t, abase);
} else if (IsAtomTerm(t)) {
hp[0] = MkAtomTerm(AddAtom(AtomOfTerm(t)));
} else if (IsPairTerm(t)) {
CELL *newp = ShiftPtr((CELL)RepPair(t), abase);
hp[0] = AbsPair(newp);
if (newp > amax) {
amax = import_pair(newp, abase, newp);
}
} else {
CELL *newp = ShiftPtr((CELL)RepAppl(t), abase);
hp[0] = AbsAppl(newp);
if (newp > amax) {
amax = import_compound(newp, abase, newp);
}
}
return amax;
}
static CELL *
import_compound(CELL *hp, char *abase, CELL *amax)
{
Functor f = (Functor)*hp;
UInt ar, i;
if (IsExtensionFunctor(f))
return amax;
ar = FetchFunctor(hp);
for (i=1; i<=ar; i++) {
amax = import_arg(hp+i, abase, amax);
}
return amax;
}
static CELL *
import_pair(CELL *hp, char *abase, CELL *amax)
{
amax = import_arg(hp, abase, amax);
amax = import_arg(hp+1, abase, amax);
return amax;
}
Term
Yap_ImportTerm(char * buf) {
CELL *bc = (CELL *)buf;
size_t sz = bc[1];
Term tinp, tret;
tinp = bc[2];
if (IsVarTerm(tinp))
return MkVarTerm();
if (IsAtomOrIntTerm(tinp)) {
if (IsAtomTerm(tinp)) {
char *pt = AdjustSizeAtom((char *)(bc+3));
return MkAtomTerm(Yap_LookupAtom(pt));
} else
return tinp;
}
if (H + sz > ASP)
return (Term)0;
memcpy(H, buf+bc[0], sizeof(CELL)*sz);
if (IsApplTerm(tinp)) {
tret = AbsAppl(H);
import_compound(H, (char *)H, H);
} else {
tret = AbsPair(H);
import_pair(H, (char *)H, H);
}
H += sz;
return tret;
}
#define DEBUG_IMPORT 1
#if DEBUG_IMPORT
static char export_debug_buf[2048];
static Int
p_export_term(void)
{
Yap_ExportTerm(ARG1, export_debug_buf, 2048);
return TRUE;
}
static Int
p_import_term(void)
{
return Yap_unify(ARG1,Yap_ImportTerm(export_debug_buf));
}
#endif
static Term vars_in_complex_term(register CELL *pt0, register CELL *pt0_end, Term inp)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
register tr_fr_ptr TR0 = TR;
CELL *InitialH = H;
CELL output = AbsPair(H);
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, vars_in_term_unk);
vars_in_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
/* store the terms to visit */
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
derefa_body(d0, ptd0, vars_in_term_unk, vars_in_term_nvar);
/* do or pt2 are unbound */
*ptd0 = TermNil;
/* leave an empty slot to fill in later */
if (H+1024 > ASP) {
goto global_overflow;
}
H[1] = AbsPair(H+2);
H += 2;
H[-2] = (CELL)ptd0;
/* next make sure noone will see this as a variable again */
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
/* Trail overflow */
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
TrailTerm(TR++) = (CELL)ptd0;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
if (H != InitialH) {
/* close the list */
Term t2 = Deref(inp);
if (IsVarTerm(t2)) {
RESET_VARIABLE(H-1);
Yap_unify((CELL)(H-1),ARG2);
} else {
H[-1] = t2; /* don't need to trail */
}
return(output);
} else {
return(inp);
}
trail_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_TRAIL_ERROR;
Yap_Error_Size = (TR-TR0)*sizeof(tr_fr_ptr *);
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
aux_overflow:
Yap_Error_Size = (to_visit-to_visit0)*sizeof(CELL **);
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_AUXSPACE_ERROR;
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
global_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
Yap_Error_TYPE = OUT_OF_STACK_ERROR;
Yap_Error_Size = (ASP-H)*sizeof(CELL);
return 0L;
}
static int
expand_vts(void)
{
UInt expand = Yap_Error_Size;
yap_error_number yap_errno = Yap_Error_TYPE;
Yap_Error_Size = 0;
Yap_Error_TYPE = YAP_NO_ERROR;
if (yap_errno == OUT_OF_TRAIL_ERROR) {
/* Trail overflow */
if (!Yap_growtrail(expand, FALSE)) {
return FALSE;
}
} else if (yap_errno == OUT_OF_AUXSPACE_ERROR) {
/* Aux space overflow */
if (expand > 4*1024*1024)
expand = 4*1024*1024;
if (!Yap_ExpandPreAllocCodeSpace(expand, NULL, TRUE)) {
return FALSE;
}
} else {
if (!Yap_gcl(expand, 3, ENV, gc_P(P,CP))) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, "in term_variables");
return FALSE;
}
}
return TRUE;
}
static Int
p_variables_in_term(void) /* variables in term t */
{
Term out, inp;
int count;
restart:
count = 0;
inp = Deref(ARG2);
while (!IsVarTerm(inp) && IsPairTerm(inp)) {
Term t = HeadOfTerm(inp);
if (IsVarTerm(t)) {
CELL *ptr = VarOfTerm(t);
*ptr = TermFoundVar;
TrailTerm(TR++) = t;
count++;
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
clean_tr(TR-count);
if (!Yap_growtrail(count*sizeof(tr_fr_ptr *), FALSE)) {
return FALSE;
}
goto restart;
}
}
inp = TailOfTerm(inp);
}
do {
Term t = Deref(ARG1);
if (IsVarTerm(t)) {
out = AbsPair(H);
H += 2;
RESET_VARIABLE(H-2);
RESET_VARIABLE(H-1);
Yap_unify((CELL)(H-2),ARG1);
Yap_unify((CELL)(H-1),ARG2);
} else if (IsPrimitiveTerm(t))
out = ARG2;
else if (IsPairTerm(t)) {
out = vars_in_complex_term(RepPair(t)-1,
RepPair(t)+1, ARG2);
}
else {
Functor f = FunctorOfTerm(t);
out = vars_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(f), ARG2);
}
if (out == 0L) {
if (!expand_vts())
return FALSE;
}
} while (out == 0L);
clean_tr(TR-count);
return Yap_unify(ARG3,out);
}
static Int
p_term_variables(void) /* variables in term t */
{
Term out;
do {
Term t = Deref(ARG1);
if (IsVarTerm(t)) {
Term out = Yap_MkNewPairTerm();
return
Yap_unify(t,HeadOfTerm(out)) &&
Yap_unify(TermNil, TailOfTerm(out)) &&
Yap_unify(out, ARG2);
} else if (IsPrimitiveTerm(t)) {
return Yap_unify(TermNil, ARG2);
} else if (IsPairTerm(t)) {
out = vars_in_complex_term(RepPair(t)-1,
RepPair(t)+1, TermNil);
}
else {
Functor f = FunctorOfTerm(t);
out = vars_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(f), TermNil);
}
if (out == 0L) {
if (!expand_vts())
return FALSE;
}
} while (out == 0L);
return Yap_unify(ARG2,out);
}
static Term attvars_in_complex_term(register CELL *pt0, register CELL *pt0_end, Term inp)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
register tr_fr_ptr TR0 = TR;
CELL *InitialH = H;
CELL output = AbsPair(H);
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, attvars_in_term_unk);
attvars_in_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
/* store the terms to visit */
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
derefa_body(d0, ptd0, attvars_in_term_unk, attvars_in_term_nvar);
if (IsAttVar(ptd0)) {
/* do or pt2 are unbound */
*ptd0 = TermNil;
/* next make sure noone will see this as a variable again */
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
/* Trail overflow */
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
TrailTerm(TR++) = (CELL)ptd0;
/* leave an empty slot to fill in later */
if (H+1024 > ASP) {
goto global_overflow;
}
H[1] = AbsPair(H+2);
H += 2;
H[-2] = (CELL)ptd0;
/* store the terms to visit */
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = &RepAttVar(ptd0)->Value;
pt0_end = &RepAttVar(ptd0)->Atts;
}
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
if (H != InitialH) {
/* close the list */
Term t2 = Deref(inp);
if (IsVarTerm(t2)) {
RESET_VARIABLE(H-1);
Yap_unify((CELL)(H-1),ARG2);
} else {
H[-1] = t2; /* don't need to trail */
}
return(output);
} else {
return(inp);
}
trail_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_TRAIL_ERROR;
Yap_Error_Size = (TR-TR0)*sizeof(tr_fr_ptr *);
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
aux_overflow:
Yap_Error_Size = (to_visit-to_visit0)*sizeof(CELL **);
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_AUXSPACE_ERROR;
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
global_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
Yap_Error_TYPE = OUT_OF_STACK_ERROR;
Yap_Error_Size = (ASP-H)*sizeof(CELL);
return 0L;
}
static Int
p_term_attvars(void) /* variables in term t */
{
Term out;
do {
Term t = Deref(ARG1);
if (IsVarTerm(t)) {
out = attvars_in_complex_term(VarOfTerm(t)-1,
VarOfTerm(t)+1, TermNil);
} else if (IsPrimitiveTerm(t)) {
return Yap_unify(TermNil, ARG2);
} else if (IsPairTerm(t)) {
out = attvars_in_complex_term(RepPair(t)-1,
RepPair(t)+1, TermNil);
}
else {
Functor f = FunctorOfTerm(t);
out = attvars_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(f), TermNil);
}
if (out == 0L) {
if (!expand_vts())
return FALSE;
}
} while (out == 0L);
return Yap_unify(ARG2,out);
}
static Int
p_term_variables3(void) /* variables in term t */
{
Term out;
do {
Term t = Deref(ARG1);
if (IsVarTerm(t)) {
Term out = Yap_MkNewPairTerm();
return
Yap_unify(t,HeadOfTerm(out)) &&
Yap_unify(ARG3, TailOfTerm(out)) &&
Yap_unify(out, ARG2);
} else if (IsPrimitiveTerm(t)) {
return Yap_unify(ARG2, ARG3);
} else if (IsPairTerm(t)) {
out = vars_in_complex_term(RepPair(t)-1,
RepPair(t)+1, ARG3);
}
else {
Functor f = FunctorOfTerm(t);
out = vars_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(f), ARG3);
}
if (out == 0L) {
if (!expand_vts())
return FALSE;
}
} while (out == 0L);
return Yap_unify(ARG2,out);
}
static Term vars_within_complex_term(register CELL *pt0, register CELL *pt0_end, Term inp)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
register tr_fr_ptr TR0 = TR;
CELL *InitialH = H;
CELL output = AbsPair(H);
to_visit0 = to_visit;
while (!IsVarTerm(inp) && IsPairTerm(inp)) {
Term t = HeadOfTerm(inp);
if (IsVarTerm(t)) {
CELL *ptr = VarOfTerm(t);
*ptr = TermFoundVar;
TrailTerm(TR++) = t;
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
}
inp = TailOfTerm(inp);
}
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, vars_within_term_unk);
vars_within_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
/* store the terms to visit */
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
} else if (d0 == TermFoundVar) {
/* leave an empty slot to fill in later */
if (H+1024 > ASP) {
goto global_overflow;
}
H[1] = AbsPair(H+2);
H += 2;
H[-2] = (CELL)ptd0;
*ptd0 = TermNil;
}
continue;
}
derefa_body(d0, ptd0, vars_within_term_unk, vars_within_term_nvar);
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
if (H != InitialH) {
H[-1] = TermNil;
return output;
} else {
return TermNil;
}
trail_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_TRAIL_ERROR;
Yap_Error_Size = (TR-TR0)*sizeof(tr_fr_ptr *);
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
aux_overflow:
Yap_Error_Size = (to_visit-to_visit0)*sizeof(CELL **);
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_AUXSPACE_ERROR;
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
global_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
Yap_Error_TYPE = OUT_OF_STACK_ERROR;
Yap_Error_Size = (ASP-H)*sizeof(CELL);
return 0L;
}
static Int
p_variables_within_term(void) /* variables within term t */
{
Term out;
do {
Term t = Deref(ARG2);
if (IsVarTerm(t)) {
out = vars_within_complex_term(VarOfTerm(t)-1,
VarOfTerm(t), Deref(ARG1));
} else if (IsPrimitiveTerm(t))
out = TermNil;
else if (IsPairTerm(t)) {
out = vars_within_complex_term(RepPair(t)-1,
RepPair(t)+1, Deref(ARG1));
}
else {
Functor f = FunctorOfTerm(t);
out = vars_within_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(f), Deref(ARG1));
}
if (out == 0L) {
if (!expand_vts())
return FALSE;
}
} while (out == 0L);
return Yap_unify(ARG3,out);
}
static Term new_vars_in_complex_term(register CELL *pt0, register CELL *pt0_end, Term inp)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
register tr_fr_ptr TR0 = TR;
CELL *InitialH = H;
CELL output = AbsPair(H);
to_visit0 = to_visit;
while (!IsVarTerm(inp) && IsPairTerm(inp)) {
Term t = HeadOfTerm(inp);
if (IsVarTerm(t)) {
CELL *ptr = VarOfTerm(t);
*ptr = TermFoundVar;
TrailTerm(TR++) = t;
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
}
inp = TailOfTerm(inp);
}
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, vars_within_term_unk);
vars_within_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
/* store the terms to visit */
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
derefa_body(d0, ptd0, vars_within_term_unk, vars_within_term_nvar);
/* do or pt2 are unbound */
*ptd0 = TermNil;
/* leave an empty slot to fill in later */
if (H+1024 > ASP) {
goto global_overflow;
}
H[1] = AbsPair(H+2);
H += 2;
H[-2] = (CELL)ptd0;
/* next make sure noone will see this as a variable again */
if (TR > (tr_fr_ptr)Yap_TrailTop - 256) {
/* Trail overflow */
if (!Yap_growtrail((TR-TR0)*sizeof(tr_fr_ptr *), TRUE)) {
goto trail_overflow;
}
}
TrailTerm(TR++) = (CELL)ptd0;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
if (H != InitialH) {
H[-1] = TermNil;
return output;
} else {
return TermNil;
}
trail_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_TRAIL_ERROR;
Yap_Error_Size = (TR-TR0)*sizeof(tr_fr_ptr *);
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
aux_overflow:
Yap_Error_Size = (to_visit-to_visit0)*sizeof(CELL **);
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
Yap_Error_TYPE = OUT_OF_AUXSPACE_ERROR;
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
return 0L;
global_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
Yap_ReleasePreAllocCodeSpace((ADDR)to_visit0);
H = InitialH;
Yap_Error_TYPE = OUT_OF_STACK_ERROR;
Yap_Error_Size = (ASP-H)*sizeof(CELL);
return 0L;
}
static Int
p_new_variables_in_term(void) /* variables within term t */
{
Term out;
do {
Term t = Deref(ARG2);
if (IsVarTerm(t)) {
out = new_vars_in_complex_term(VarOfTerm(t)-1,
VarOfTerm(t), Deref(ARG1));
} else if (IsPrimitiveTerm(t))
out = TermNil;
else if (IsPairTerm(t)) {
out = new_vars_in_complex_term(RepPair(t)-1,
RepPair(t)+1, Deref(ARG1));
}
else {
Functor f = FunctorOfTerm(t);
out = new_vars_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(f), Deref(ARG1));
}
if (out == 0L) {
if (!expand_vts())
return FALSE;
}
} while (out == 0L);
return Yap_unify(ARG3,out);
}
static Term non_singletons_in_complex_term(register CELL *pt0, register CELL *pt0_end)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
register tr_fr_ptr TR0 = TR;
CELL *InitialH = H;
CELL output = AbsPair(H);
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, vars_in_term_unk);
vars_in_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
} else if (d0 == TermFoundVar) {
CELL *pt2 = pt0;
while(IsVarTerm(*pt2))
pt2 = (CELL *)(*pt2);
H[1] = AbsPair(H+2);
H += 2;
H[-2] = (CELL)pt2;
*pt2 = TermReFoundVar;
}
continue;
}
derefa_body(d0, ptd0, vars_in_term_unk, vars_in_term_nvar);
/* do or pt2 are unbound */
*ptd0 = TermFoundVar;
/* next make sure we can recover the variable again */
TrailTerm(TR++) = (CELL)ptd0;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
clean_tr(TR0);
if (H != InitialH) {
/* close the list */
RESET_VARIABLE(H-1);
Yap_unify((CELL)(H-1),ARG2);
return output;
} else {
return ARG2;
}
aux_overflow:
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
if (H != InitialH) {
/* close the list */
RESET_VARIABLE(H-1);
}
return 0L;
}
static Int
p_non_singletons_in_term(void) /* non_singletons in term t */
{
Term t;
Term out;
while (TRUE) {
t = Deref(ARG1);
if (IsVarTerm(t)) {
out = MkPairTerm(t,ARG2);
} else if (IsPrimitiveTerm(t)) {
out = ARG2;
} else if (IsPairTerm(t)) {
out = non_singletons_in_complex_term(RepPair(t)-1,
RepPair(t)+1);
} else {
out = non_singletons_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(FunctorOfTerm(t)));
}
if (out != 0L) {
return Yap_unify(ARG3,out);
} else {
if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
Yap_Error(OUT_OF_AUXSPACE_ERROR, ARG1, "overflow in singletons");
return FALSE;
}
}
}
}
static Int ground_complex_term(register CELL *pt0, register CELL *pt0_end)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, vars_in_term_unk);
vars_in_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
derefa_body(d0, ptd0, vars_in_term_unk, vars_in_term_nvar);
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
}
#endif
return FALSE;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
return TRUE;
aux_overflow:
/* unwind stack */
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
return -1;
}
int Yap_IsGroundTerm(Term t)
{
while (TRUE) {
Int out;
if (IsVarTerm(t)) {
return FALSE;
} else if (IsPrimitiveTerm(t)) {
return TRUE;
} else if (IsPairTerm(t)) {
if ((out =ground_complex_term(RepPair(t)-1,
RepPair(t)+1)) >= 0) {
return out;
}
} else {
Functor fun = FunctorOfTerm(t);
if (IsExtensionFunctor(fun))
return TRUE;
else if ((out = ground_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(fun))) >= 0) {
return out;
}
}
if (out < 0) {
if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
Yap_Error(OUT_OF_AUXSPACE_ERROR, ARG1, "overflow in ground");
return FALSE;
}
}
}
}
static Int
p_ground(void) /* ground(+T) */
{
return Yap_IsGroundTerm(Deref(ARG1));
}
static int
SizeOfExtension(Term t)
{
Functor f = FunctorOfTerm(t);
if (f== FunctorDouble) {
return 2 + sizeof(Float)/sizeof(CELL);
}
if (f== FunctorLongInt) {
return 2 + sizeof(Float)/sizeof(CELL);
}
if (f== FunctorDBRef) {
return 0;
}
if (f== FunctorBigInt) {
CELL *pt = RepAppl(t)+2;
return 3+sizeof(MP_INT)+(((MP_INT *)(pt))->_mp_alloc*sizeof(mp_limb_t));
}
return 0;
}
static Int sz_ground_complex_term(register CELL *pt0, register CELL *pt0_end, int ground)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
Int sz = 0;
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, vars_in_term_unk);
vars_in_term_nvar:
{
if (IsPairTerm(d0)) {
sz += 2;
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
sz += SizeOfExtension(d0);
continue;
}
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
sz += (1+d0);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
derefa_body(d0, ptd0, vars_in_term_unk, vars_in_term_nvar);
if (!ground)
continue;
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
}
#endif
return 0;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
return sz;
aux_overflow:
/* unwind stack */
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
return -1;
}
int
Yap_SizeGroundTerm(Term t, int ground)
{
if (IsVarTerm(t)) {
if (!ground)
return 1;
return 0;
} else if (IsPrimitiveTerm(t)) {
return 1;
} else if (IsPairTerm(t)) {
int sz = sz_ground_complex_term(RepPair(t)-1, RepPair(t)+1, ground);
if (sz <= 0)
return sz;
return sz+2;
} else {
int sz = 0;
Functor fun = FunctorOfTerm(t);
if (IsExtensionFunctor(fun))
return 1+ SizeOfExtension(t);
sz = sz_ground_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(fun),
ground);
if (sz <= 0)
return sz;
return 1+ArityOfFunctor(fun)+sz;
}
}
static Int var_in_complex_term(register CELL *pt0,
register CELL *pt0_end,
Term v)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
register tr_fr_ptr TR0 = TR;
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, var_in_term_unk);
var_in_term_nvar:
{
if (IsPairTerm(d0)) {
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
continue;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
continue;
}
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit += 3;
*pt0 = TermNil;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit += 2;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
deref_body(d0, ptd0, var_in_term_unk, var_in_term_nvar);
if ((CELL)ptd0 == v) { /* we found it */
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
return(TRUE);
}
/* do or pt2 are unbound */
*ptd0 = TermNil;
/* next make sure noone will see this as a variable again */
TrailTerm(TR++) = (CELL)ptd0;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
#else
to_visit -= 2;
pt0 = to_visit[0];
pt0_end = to_visit[1];
#endif
goto loop;
}
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
clean_tr(TR0);
return FALSE;
aux_overflow:
/* unwind stack */
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 3;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
return -1;
}
static Int
var_in_term(Term v, Term t) /* variables in term t */
{
if (IsVarTerm(t)) {
return(v == t);
} else if (IsPrimitiveTerm(t)) {
return(FALSE);
} else if (IsPairTerm(t)) {
return(var_in_complex_term(RepPair(t)-1,
RepPair(t)+1, v));
}
else return(var_in_complex_term(RepAppl(t),
RepAppl(t)+
ArityOfFunctor(FunctorOfTerm(t)),v));
}
static Int
p_var_in_term(void)
{
return(var_in_term(Deref(ARG2), Deref(ARG1)));
}
/* The code for TermHash was originally contributed by Gertjen Van Noor */
/* This code with max_depth == -1 will loop for infinite trees */
//-----------------------------------------------------------------------------
// MurmurHash2, by Austin Appleby
// Note - This code makes a few assumptions about how your machine behaves -
// 1. We can read a 4-byte value from any address without crashing
// 2. sizeof(int) == 4
// And it has a few limitations -
// 1. It will not work incrementally.
// 2. It will not produce the same results on little-endian and big-endian
// machines.
static unsigned int
MurmurHashNeutral2 ( const void * key, int len, unsigned int seed )
{
const unsigned int m = 0x5bd1e995;
const int r = 24;
unsigned int h = seed ^ len;
const unsigned char * data = (const unsigned char *)key;
while(len >= 4)
{
unsigned int k;
k = data[0];
k |= data[1] << 8;
k |= data[2] << 16;
k |= data[3] << 24;
k *= m;
k ^= k >> r;
k *= m;
h *= m;
h ^= k;
data += 4;
len -= 4;
}
switch(len)
{
case 3: h ^= data[2] << 16;
case 2: h ^= data[1] << 8;
case 1: h ^= data[0];
h *= m;
};
h ^= h >> 13;
h *= m;
h ^= h >> 15;
return h;
}
static CELL *
AddAtomToHash(CELL *st, Atom at)
{
unsigned int len;
CELL * start;
if (IsWideAtom(at)) {
wchar_t *c = RepAtom(at)->WStrOfAE;
int ulen = wcslen(c);
len = ulen*sizeof(wchar_t);
if (len % CellSize == 0) {
len /= CellSize;
} else {
len /= CellSize;
len++;
}
st[len-1] = 0L;
wcsncpy((wchar_t *)st, c, ulen);
} else {
char *c = RepAtom(at)->StrOfAE;
int ulen = strlen(c);
/* fix hashing over empty atom */
if (!ulen) {
return st;
}
start = (CELL *)c;
if (ulen % CellSize == 0) {
len = ulen/CellSize;
} else {
len = ulen/CellSize;
len++;
}
st[len-1] = 0L;
strncpy((char *)st, c, ulen);
}
return st+len;
}
static CELL *
hash_complex_term(register CELL *pt0,
register CELL *pt0_end,
Int depth,
CELL *st,
int variant)
{
register CELL **to_visit0, **to_visit = (CELL **)Yap_PreAllocCodeSpace();
to_visit0 = to_visit;
loop:
while (pt0 < pt0_end) {
register CELL d0;
register CELL *ptd0;
++ pt0;
ptd0 = pt0;
d0 = *ptd0;
deref_head(d0, hash_complex_unk);
hash_complex_nvar:
{
if (st + 1024 >= ASP) {
goto global_overflow;
}
if (IsAtomOrIntTerm(d0)) {
if (d0 != TermFoundVar) {
if (IsAtomTerm(d0)) {
st = AddAtomToHash(st, AtomOfTerm(d0));
} else {
*st++ = IntOfTerm(d0);
}
}
continue;
} else if (IsPairTerm(d0)) {
st = AddAtomToHash(st, AtomDot);
if (depth == 1)
continue;
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit[3] = (CELL *)(depth--);
to_visit += 4;
*pt0 = TermFoundVar;
#else
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)(depth--);
to_visit += 3;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
continue;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2;
/* store the terms to visit */
ap2 = RepAppl(d0);
f = (Functor)(*ap2);
if (IsExtensionFunctor(f)) {
CELL fc = (CELL)f;
switch(fc) {
case (CELL)FunctorDBRef:
*st++ = fc;
break;
case (CELL)FunctorLongInt:
*st++ = LongIntOfTerm(d0);
break;
#ifdef USE_GMP
case (CELL)FunctorBigInt:
{
CELL *pt = RepAppl(d0);
Int sz =
sizeof(MP_INT)+1+
(((MP_INT *)(pt+2))->_mp_alloc*sizeof(mp_limb_t));
if (st + (1024 + sz/CellSize) >= ASP) {
goto global_overflow;
}
/* then the actual number */
memcpy((void *)(st+1), (void *)(pt+1), sz);
st = st+sz/CellSize;
}
break;
#endif
case (CELL)FunctorDouble:
{
CELL *pt = RepAppl(d0);
*st++ = pt[1];
#if SIZEOF_DOUBLE == 2*SIZEOF_LONG_INT
*st++ = pt[2];
#endif
break;
}
}
continue;
}
st = AddAtomToHash(st, NameOfFunctor(f));
if (depth == 1)
continue;
if (to_visit + 1024 >= (CELL **)AuxSp) {
goto aux_overflow;
}
#ifdef RATIONAL_TREES
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = (CELL *)*pt0;
to_visit[3] = (CELL *)(depth--);
to_visit += 4;
*pt0 = TermFoundVar;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = depth--;
to_visit += 3;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
}
continue;
}
deref_body(d0, ptd0, hash_complex_unk, hash_complex_nvar);
if (!variant)
return NULL;
else
continue;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
#ifdef RATIONAL_TREES
to_visit -= 4;
pt0 = to_visit[0];
pt0_end = to_visit[1];
*pt0 = (CELL)to_visit[2];
depth = (CELL)to_visit[3];
#else
to_visit -= 3;
pt0 = to_visit[0];
pt0_end = to_visit[1];
depth = (CELL)to_visit[2];
#endif
goto loop;
}
return st;
aux_overflow:
/* unwind stack */
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 4;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
return (CELL *)-1;
global_overflow:
/* unwind stack */
#ifdef RATIONAL_TREES
while (to_visit > to_visit0) {
to_visit -= 4;
pt0 = to_visit[0];
*pt0 = (CELL)to_visit[2];
}
#endif
return (CELL *) -2;
}
static Int
p_term_hash(void)
{
unsigned int i1;
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
Term t3 = Deref(ARG3);
Term result;
Int size, depth;
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR,t2,"term_hash/4");
return(FALSE);
}
if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER,t2,"term_hash/4");
return(FALSE);
}
depth = IntegerOfTerm(t2);
if (depth == 0) {
if (IsVarTerm(t1)) return(TRUE);
return(Yap_unify(ARG4,MkIntTerm(0)));
}
if (IsVarTerm(t3)) {
Yap_Error(INSTANTIATION_ERROR,t3,"term_hash/4");
return(FALSE);
}
if (!IsIntegerTerm(t3)) {
Yap_Error(TYPE_ERROR_INTEGER,t3,"term_hash/4");
return(FALSE);
}
size = IntegerOfTerm(t3);
while (TRUE) {
CELL *ar = hash_complex_term(&t1-1, &t1, depth, H, FALSE);
if (ar == (CELL *)-1) {
if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
Yap_Error(OUT_OF_AUXSPACE_ERROR, ARG1, "overflow in term_hash");
return FALSE;
}
t1 = Deref(ARG1);
} else if(ar == (CELL *)-2) {
if (!Yap_gcl((ASP-H)*sizeof(CELL), 4, ENV, gc_P(P,CP))) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, "in term_hash");
return FALSE;
}
t1 = Deref(ARG1);
} else if (ar == NULL) {
return FALSE;
} else {
i1 = MurmurHashNeutral2((const void *)H, CellSize*(ar-H),0x1a3be34a);
break;
}
}
/* got the seed and hash from SWI-Prolog */
result = MkIntegerTerm(i1 % size);
return Yap_unify(ARG4,result);
}
static Int
p_instantiated_term_hash(void)
{
unsigned int i1;
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
Term t3 = Deref(ARG3);
Term result;
Int size, depth;
if (IsVarTerm(t2)) {
Yap_Error(INSTANTIATION_ERROR,t2,"term_hash/4");
return(FALSE);
}
if (!IsIntegerTerm(t2)) {
Yap_Error(TYPE_ERROR_INTEGER,t2,"term_hash/4");
return(FALSE);
}
depth = IntegerOfTerm(t2);
if (depth == 0) {
if (IsVarTerm(t1)) return(TRUE);
return(Yap_unify(ARG4,MkIntTerm(0)));
}
if (IsVarTerm(t3)) {
Yap_Error(INSTANTIATION_ERROR,t3,"term_hash/4");
return(FALSE);
}
if (!IsIntegerTerm(t3)) {
Yap_Error(TYPE_ERROR_INTEGER,t3,"term_hash/4");
return(FALSE);
}
size = IntegerOfTerm(t3);
while (TRUE) {
CELL *ar = hash_complex_term(&t1-1, &t1, depth, H, TRUE);
if (ar == (CELL *)-1) {
if (!Yap_ExpandPreAllocCodeSpace(0, NULL, TRUE)) {
Yap_Error(OUT_OF_AUXSPACE_ERROR, ARG1, "overflow in term_hash");
return FALSE;
}
t1 = Deref(ARG1);
} else if(ar == (CELL *)-2) {
if (!Yap_gcl((ASP-H)*sizeof(CELL), 4, ENV, gc_P(P,CP))) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, "in term_hash");
return FALSE;
}
t1 = Deref(ARG1);
} else if (ar == NULL) {
return FALSE;
} else {
i1 = MurmurHashNeutral2((const void *)H, CellSize*(ar-H),0x1a3be34a);
break;
}
}
/* got the seed and hash from SWI-Prolog */
result = MkIntegerTerm(i1 % size);
return Yap_unify(ARG4,result);
}
static int variant_complex(register CELL *pt0, register CELL *pt0_end, register
CELL *pt1)
{
tr_fr_ptr OLDTR = TR;
register CELL **to_visit = (CELL **)ASP;
/* make sure that unification always forces trailing */
HBREG = H;
loop:
while (pt0 < pt0_end) {
register CELL d0, d1;
++ pt0;
++ pt1;
d0 = Derefa(pt0);
d1 = Derefa(pt1);
if (IsVarTerm(d0)) {
if (IsVarTerm(d1)) {
CELL *pt0 = VarOfTerm(d0);
CELL *pt1 = VarOfTerm(d1);
if (pt0 >= HBREG || pt1 >= HBREG) {
/* one of the variables has been found before */
if (VarOfTerm(d0)+1 == VarOfTerm(d1)) continue;
goto fail;
} else {
/* two new occurrences of the same variable */
Term n0 = MkVarTerm(), n1 = MkVarTerm();
Bind_Global(VarOfTerm(d0), n0);
Bind_Global(VarOfTerm(d1), n1);
}
continue;
} else {
goto fail;
}
} else if (IsVarTerm(d1)) {
goto fail;
} else {
if (d0 == d1) continue;
else if (IsAtomOrIntTerm(d0)) {
goto fail;
} else if (IsPairTerm(d0)) {
if (!IsPairTerm(d1)) {
goto fail;
}
#ifdef RATIONAL_TREES
/* now link the two structures so that no one else will */
/* come here */
to_visit -= 4;
if ((CELL *)to_visit < H+1024)
goto out_of_stack;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
to_visit[3] = (CELL *)*pt0;
*pt0 = d1;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit -= 3;
if ((CELL *)to_visit < H+1024)
goto out_of_stack;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
}
#endif
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
pt1 = RepPair(d1) - 1;
continue;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2, *ap3;
if (!IsApplTerm(d1)) {
goto fail;
} else {
/* store the terms to visit */
Functor f2;
ap2 = RepAppl(d0);
ap3 = RepAppl(d1);
f = (Functor)(*ap2);
f2 = (Functor)(*ap3);
if (f != f2)
goto fail;
if (IsExtensionFunctor(f)) {
if (!unify_extension(f, d0, ap2, d1))
goto fail;
continue;
}
#ifdef RATIONAL_TREES
/* now link the two structures so that no one else will */
/* come here */
to_visit -= 4;
if ((CELL *)to_visit < H+1024)
goto out_of_stack;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
to_visit[3] = (CELL *)*pt0;
*pt0 = d1;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit -= 3;
if ((CELL *)to_visit < H+1024)
goto out_of_stack;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
}
#endif
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
pt1 = ap3;
continue;
}
}
}
}
/* Do we still have compound terms to visit */
if (to_visit < (CELL **)ASP) {
#ifdef RATIONAL_TREES
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
*pt0 = (CELL)to_visit[3];
to_visit += 4;
#else
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
to_visit += 3;
#endif
goto loop;
}
H = HBREG;
/* untrail all bindings made by variant */
while (TR != (tr_fr_ptr)OLDTR) {
CELL *pt1 = (CELL *) TrailTerm(--TR);
RESET_VARIABLE(pt1);
}
HBREG = B->cp_h;
return TRUE;
out_of_stack:
H = HBREG;
/* untrail all bindings made by variant */
#ifdef RATIONAL_TREES
while (to_visit < (CELL **)ASP) {
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
*pt0 = (CELL)to_visit[3];
to_visit += 4;
}
#endif
while (TR != (tr_fr_ptr)OLDTR) {
CELL *pt1 = (CELL *) TrailTerm(--TR);
RESET_VARIABLE(pt1);
}
HBREG = B->cp_h;
return -1;
fail:
/* failure */
H = HBREG;
#ifdef RATIONAL_TREES
while (to_visit < (CELL **)ASP) {
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
*pt0 = (CELL)to_visit[3];
to_visit += 4;
}
#endif
/* untrail all bindings made by variant */
while (TR != (tr_fr_ptr)OLDTR) {
CELL *pt1 = (CELL *) TrailTerm(--TR);
RESET_VARIABLE(pt1);
}
HBREG = B->cp_h;
return FALSE;
}
static Int
p_variant(void) /* variant terms t1 and t2 */
{
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
int out;
if (t1 == t2)
return (TRUE);
if (IsVarTerm(t1)) {
if (IsVarTerm(t2))
return(TRUE);
return(FALSE);
} else if (IsVarTerm(t2))
return(FALSE);
if (IsAtomOrIntTerm(t1)) {
return(t1 == t2);
}
if (IsPairTerm(t1)) {
if (IsPairTerm(t2)) {
out = variant_complex(RepPair(t1)-1,
RepPair(t1)+1,
RepPair(t2)-1);
if (out < 0) goto error;
return out;
}
else return (FALSE);
}
if (!IsApplTerm(t2)) {
return FALSE;
} else {
Functor f1 = FunctorOfTerm(t1);
if (f1 != FunctorOfTerm(t2)) return(FALSE);
if (IsExtensionFunctor(f1)) {
return(unify_extension(f1, t1, RepAppl(t1), t2));
}
out = variant_complex(RepAppl(t1),
RepAppl(t1)+ArityOfFunctor(f1),
RepAppl(t2));
if (out < 0) goto error;
return out;
}
error:
if (out == -1) {
if (!Yap_gcl((ASP-H)*sizeof(CELL), 2, ENV, gc_P(P,CP))) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, "in variant");
return FALSE;
}
return p_variant();
}
return FALSE;
}
static int subsumes_complex(register CELL *pt0, register CELL *pt0_end, register
CELL *pt1)
{
register CELL **to_visit = (CELL **)ASP;
tr_fr_ptr OLDTR = TR, new_tr;
UInt write_mode = TRUE;
HBREG = H;
loop:
while (pt0 < pt0_end) {
register CELL d0, d1;
Int our_write_mode = write_mode;
++ pt0;
++ pt1;
/* this is a version of Derefa that checks whether we are trying to
do something evil */
{
CELL *npt0 = pt0;
restart_d0:
if (npt0 >= HBREG) {
our_write_mode = FALSE;
}
d0 = *npt0;
if (IsVarTerm(d0) &&
d0 != (CELL)npt0
) {
npt0 = (CELL *)d0;
goto restart_d0;
}
}
{
CELL *npt1 = pt1;
restart_d1:
d1 = *npt1;
if (IsVarTerm(d1)
&& d1 != (CELL)npt1
) {
/* never dereference through a variable from the left-side */
if (npt1 >= HBREG) {
goto fail;
} else {
npt1 = (CELL *)d1;
goto restart_d1;
}
}
}
if (IsVarTerm(d0)) {
if (our_write_mode) {
/* generate a new binding */
CELL *pt0 = VarOfTerm(d0);
Term new = MkVarTerm();
Bind_Global(pt0, new);
if (d0 != d1) { /* avoid loops */
Bind_Global(VarOfTerm(new), d1);
if (Yap_rational_tree_loop(VarOfTerm(new)-1,VarOfTerm(new),(CELL **)AuxSp,(CELL **)AuxBase))
goto fail;
}
} else {
if (d0 == d1) continue;
goto fail;
}
continue;
} else if (IsVarTerm(d1)) {
goto fail;
} else {
if (d0 == d1) continue;
else if (IsAtomOrIntTerm(d0)) {
goto fail;
} else if (IsPairTerm(d0)) {
if (!IsPairTerm(d1)) {
goto fail;
}
#ifdef RATIONAL_TREES
/* now link the two structures so that no one else will */
/* come here */
to_visit -= 5;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
to_visit[3] = (CELL *)*pt0;
to_visit[4] = (CELL *)write_mode;
*pt0 = d1;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit -= 4;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
to_visit[3] = (CELL *)write_mode;
}
#endif
write_mode = our_write_mode;
pt0 = RepPair(d0) - 1;
pt0_end = RepPair(d0) + 1;
pt1 = RepPair(d1) - 1;
continue;
} else if (IsApplTerm(d0)) {
register Functor f;
register CELL *ap2, *ap3;
if (!IsApplTerm(d1)) {
goto fail;
} else {
/* store the terms to visit */
Functor f2;
ap2 = RepAppl(d0);
ap3 = RepAppl(d1);
f = (Functor)(*ap2);
f2 = (Functor)(*ap3);
if (f != f2)
goto fail;
if (IsExtensionFunctor(f)) {
if (!unify_extension(f, d0, ap2, d1))
goto fail;
continue;
}
#ifdef RATIONAL_TREES
/* now link the two structures so that no one else will */
/* come here */
to_visit -= 5;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
to_visit[3] = (CELL *)*pt0;
to_visit[4] = (CELL *)write_mode;
*pt0 = d1;
#else
/* store the terms to visit */
if (pt0 < pt0_end) {
to_visit -= 4;
to_visit[0] = pt0;
to_visit[1] = pt0_end;
to_visit[2] = pt1;
to_visit[3] = (CELL *)write_mode;
}
#endif
write_mode = our_write_mode;
d0 = ArityOfFunctor(f);
pt0 = ap2;
pt0_end = ap2 + d0;
pt1 = ap3;
continue;
}
}
}
}
/* Do we still have compound terms to visit */
if (to_visit < (CELL **)ASP) {
#ifdef RATIONAL_TREES
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
*pt0 = (CELL)to_visit[3];
write_mode = (Int)to_visit[ 4];
to_visit += 5;
#else
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
write_mode = (UInt)to_visit[3];
to_visit += 4;
#endif
goto loop;
}
H = HBREG;
/* get rid of intermediate variables */
new_tr = TR;
while (TR != OLDTR) {
/* cell we bound */
CELL *pt1 = (CELL *) TrailTerm(--TR);
/* cell we created */
CELL *npt1 = (CELL *)*pt1;
/* shorten the chain */
if (IsVarTerm(*pt1) && IsUnboundVar(pt1)) {
RESET_VARIABLE(pt1);
} else {
*pt1 = *npt1;
}
}
TR = new_tr;
HBREG = B->cp_h;
return TRUE;
fail:
H = HBREG;
#ifdef RATIONAL_TREES
while (to_visit < (CELL **)ASP) {
pt0 = to_visit[0];
pt0_end = to_visit[1];
pt1 = to_visit[2];
*pt0 = (CELL)to_visit[3];
to_visit += 5;
}
#endif
/* untrail all bindings made by variant */
while (TR != (tr_fr_ptr)OLDTR) {
CELL *pt1 = (CELL *) TrailTerm(--TR);
RESET_VARIABLE(pt1);
}
HBREG = B->cp_h;
return FALSE;
}
static Int
p_subsumes(void) /* subsumes terms t1 and t2 */
{
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
if (t1 == t2)
return (TRUE);
if (IsVarTerm(t1)) {
Bind(VarOfTerm(t1), t2);
if (Yap_rational_tree_loop(VarOfTerm(t1)-1,VarOfTerm(t1),(CELL **)AuxSp,(CELL **)AuxBase))
return FALSE;
return TRUE;
} else if (IsVarTerm(t2))
return(FALSE);
if (IsAtomOrIntTerm(t1)) {
return(t1 == t2);
}
if (IsPairTerm(t1)) {
if (IsPairTerm(t2)) {
return(subsumes_complex(RepPair(t1)-1,
RepPair(t1)+1,
RepPair(t2)-1));
}
else return (FALSE);
} else {
Functor f1;
if (!IsApplTerm(t2)) return(FALSE);
f1 = FunctorOfTerm(t1);
if (f1 != FunctorOfTerm(t2))
return(FALSE);
if (IsExtensionFunctor(f1)) {
return(unify_extension(f1, t1, RepAppl(t1), t2));
}
return(subsumes_complex(RepAppl(t1),
RepAppl(t1)+ArityOfFunctor(f1),
RepAppl(t2)));
}
}
#ifdef DEBUG
static Int
p_force_trail_expansion()
{
Int i = IntOfTerm(Deref(ARG1))*1024, j = 0;
tr_fr_ptr OTR = TR;
for (j = 0; j < i; j++) {
TrailTerm(TR) = 0;
TR++;
}
TR = OTR;
return(TRUE);
}
static Int
camacho_dum(void)
{
Term t1, t2;
int max = 3;
/* build output list */
t1 = TermNil;
t2 = MkPairTerm(MkIntegerTerm(max), t1);
return(Yap_unify(t2, ARG1));
}
#endif /* DEBUG */
int
Yap_IsListTerm(Term t)
{
while (!IsVarTerm(t) && IsPairTerm(t)) {
t = TailOfTerm(t);
}
return t == TermNil;
}
static Int
p_is_list(void)
{
return Yap_IsListTerm(Deref(ARG1));
}
void Yap_InitUtilCPreds(void)
{
Term cm = CurrentModule;
Yap_InitCPred("copy_term", 2, p_copy_term, 0);
Yap_InitCPred("duplicate_term", 2, p_duplicate_term, 0);
Yap_InitCPred("copy_term_nat", 2, p_copy_term_no_delays, 0);
Yap_InitCPred("ground", 1, p_ground, SafePredFlag);
Yap_InitCPred("$variables_in_term", 3, p_variables_in_term, HiddenPredFlag);
Yap_InitCPred("$non_singletons_in_term", 3, p_non_singletons_in_term, SafePredFlag|HiddenPredFlag);
Yap_InitCPred("term_variables", 2, p_term_variables, 0);
Yap_InitCPred("term_variables", 3, p_term_variables3, 0);
Yap_InitCPred("term_attvars", 2, p_term_attvars, 0);
Yap_InitCPred("is_list", 1, p_is_list, SafePredFlag);
Yap_InitCPred("=@=", 2, p_variant, 0);
#ifdef DEBUG_IMPORT
Yap_InitCPred("import_term", 1, p_import_term, 0);
Yap_InitCPred("export_term", 1, p_export_term, 0);
#endif
CurrentModule = TERMS_MODULE;
Yap_InitCPred("variable_in_term", 2, p_var_in_term, SafePredFlag);
Yap_InitCPred("term_hash", 4, p_term_hash, SafePredFlag);
Yap_InitCPred("instantiated_term_hash", 4, p_instantiated_term_hash, SafePredFlag);
Yap_InitCPred("variant", 2, p_variant, 0);
Yap_InitCPred("subsumes", 2, p_subsumes, SafePredFlag);
Yap_InitCPred("variables_within_term", 3, p_variables_within_term, 3);
Yap_InitCPred("new_variables_in_term", 3, p_new_variables_in_term, 3);
CurrentModule = cm;
#ifdef DEBUG
Yap_InitCPred("$force_trail_expansion", 1, p_force_trail_expansion, SafePredFlag|HiddenPredFlag);
Yap_InitCPred("dum", 1, camacho_dum, SafePredFlag);
#endif
}
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