term_attvars/2.

This commit is contained in:
Vitor Santos Costa 2010-03-12 08:49:12 +00:00
parent c41f6e1906
commit 222ead095c

View File

@ -841,6 +841,226 @@ p_term_variables(void) /* variables in term t */
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 */
{
@ -2863,6 +3083,7 @@ void Yap_InitUtilCPreds(void)
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);
CurrentModule = TERMS_MODULE;