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rational trees

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This commit is contained in:
Vítor Santos Costa 2019-02-02 22:33:18 +00:00
parent fa96ffa932
commit 38610c0b0d
5 changed files with 139 additions and 96 deletions
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212
C/terms.c
View File

@ -144,7 +144,7 @@ typedef struct non_single_struct_t {
*to_visit_max = to_visit + 1024; \
\
restart: \
if (pt0 < pt0_end) { \
while (pt0 < pt0_end) { \
register CELL d0; \
register CELL *ptd0; \
++pt0; \
@ -1225,7 +1225,7 @@ static int max_numbered_var(CELL *pt0, CELL *pt0_end, Int *maxp USES_REGS) {
}
static Int MaxNumberedVar(Term inp, UInt arity_REGS) {
static Int MaxNumberedVar(Term inp, UInt arity PASS_REGS) {
Term t = Deref(inp);
if (IsPrimitiveTerm(t)) {
@ -1240,74 +1240,53 @@ static Int MaxNumberedVar(Term inp, UInt arity_REGS) {
}
}
#define BREAK_LOOP(BOTTOM, TOP) (AtomTag | (CELL)to_visit)
/**
* @pred largest_numbervar( +_Term_, -Max)
*
* Unify _Max_ with the largest integer _I_ such that `$VAR(I)` is a
* sub-term of _Term_.
*
* This built-in predicate is useful if part of a term has been grounded, and
* now you want to ground the full term.
*/
static Int largest_numbervar(USES_REGS1)
{
return Yap_unify(MaxNumberedVar(Deref(ARG1), 2 PASS_REGS), ARG2);
}
#define WALK_CYCLES_IN_TERM(LIST0, STRUCT0) \
if (IsPairTerm(d0)) { \
if (to_visit + 32 >= to_visit_max) { \
goto aux_overflow; \
} \
CELL *headp = RepPair(d0); \
if (IsAtomTerm(*headp) && \
(CELL *)AtomOfTerm(*headp) >= (CELL *)to_visit0 && \
(CELL *)AtomOfTerm(*headp) < (CELL *)to_visit_max) { \
LIST0; \
*headp = BREAK_LOOP(ptd0, headp); \
goto restart; \
} \
to_visit->pt0 = pt0; \
to_visit->pt0_end = pt0_end; \
to_visit->ptd0 = headp; \
to_visit->d0 = *headp; \
to_visit++; \
d0 = *headp; \
pt0 = headp; \
*pt0 = TermFreeTerm; \
pt0_end = headp + 1; \
if (pt0 <= pt0_end) \
goto list_loop; \
} else if (IsApplTerm(d0)) { \
register Functor f; \
register CELL *ap2; \
/* store the terms to visit */ \
ap2 = RepAppl(d0); \
f = (Functor)(*ap2); \
\
if (IsExtensionFunctor(f) || IsAtomTerm((CELL)f)) { \
\
*ap2 = BREAK_LOOP(ptd0, ap2); \
goto restart; \
} \
STRUCT0; \
if (to_visit + 32 >= to_visit_max) { \
goto aux_overflow; \
} \
to_visit->pt0 = pt0; \
to_visit->pt0_end = pt0_end; \
to_visit->ptd0 = ap2; \
to_visit->d0 = *ap2; \
to_visit++; \
\
*ap2 = TermFoundVar; \
d0 = ArityOfFunctor(f); \
pt0 = ap2; \
pt0_end = ap2 + d0; \
goto restart;\
}
static Term BREAK_LOOP(int ddep ) {
Term t0 = MkIntegerTerm (ddep);
return Yap_MkApplTerm(Yap_MkFunctor(Yap_LookupAtom("@^"), 1), 1, &t0);
}
static Term UNFOLD_LOOP( Term t, Term *b, Term *l) {
Term ti = Yap_MkNewApplTerm(FunctorEq, 2);
RepAppl(ti)[2] = t;
Term o = RepAppl(ti)[1];
HR[0] = ti;
HR[1] = *l;
l[0] = AbsPair(HR);
if (b!=NULL && *b==TermNil)
b = l;
l = HR+1;
HR+=2;
return o;
}
static int loops_in_complex_term(CELL *pt0, CELL *pt0_end USES_REGS) {
static int loops_in_complex_term(CELL *pt0, CELL *pt0_end, Term *listp, Term *endp USES_REGS) {
int lvl = push_text_stack();
struct non_single_struct_t *to_visit = Malloc(
1024 * sizeof(struct non_single_struct_t)),
1024 * sizeof(struct non_single_struct_t)),
*to_visit0 = to_visit,
*to_visit_max = to_visit + 1024;
to_visit0 = to_visit;
to_visit_max = to_visit0 + 1024;
restart:
if (pt0 < pt0_end) {
while (pt0 < pt0_end) {
CELL d0;
CELL *ptd0;
++pt0;
@ -1315,49 +1294,127 @@ restart:
d0 = *ptd0;
list_loop:
deref_head(d0, vars_in_term_unk);
vars_in_term_nvar : {
WALK_CYCLES_IN_TERM({}, {});
vars_in_term_nvar :
if (IsPairTerm(d0)) {
if (to_visit + 32 >= to_visit_max) {
goto aux_overflow;
}
CELL *headp = RepPair(d0);
goto restart;
d0 = headp[0];
if (IsAtomTerm(d0) &&
(CELL *)AtomOfTerm(d0) >= (CELL *)to_visit0 &&
(CELL *)AtomOfTerm(d0) < (CELL *)to_visit_max) {
// LIST0;
struct non_single_struct_t *v0 = (struct non_single_struct_t *)AtomOfTerm(d0);
if (listp) {
*ptd0 = UNFOLD_LOOP(AbsPair(headp), listp, endp);
} else {
*ptd0 = BREAK_LOOP(to_visit-v0);
}
goto restart;
}
to_visit->pt0 = pt0;
to_visit->pt0_end = pt0_end;
to_visit->ptd0 = headp;
to_visit->d0 = d0;
*headp = MkAtomTerm((AtomEntry*)to_visit);
to_visit++;
pt0 = headp;
pt0_end = pt0 + 1;
ptd0 = pt0;
goto list_loop;
} 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 (IsAtomTerm((CELL)f)) {
if (listp) {
*ptd0 = UNFOLD_LOOP(AbsAppl(ap2), listp, endp);
} else {
*ptd0 = BREAK_LOOP(to_visit-(struct non_single_struct_t *)AtomOfTerm(*ap2));
}
goto restart;
}
// STRUCT0;
if (to_visit + 32 >= to_visit_max) {
goto aux_overflow;
}
to_visit->pt0 = pt0;
to_visit->pt0_end = pt0_end;
to_visit->ptd0 = ap2;
to_visit->d0 = *ap2;
*ap2 = MkAtomTerm((AtomEntry*)to_visit);
to_visit++;
pt0 = ap2;
pt0_end = ap2 + (ArityOfFunctor(f));
}
goto restart;
derefa_body(d0, ptd0, vars_in_term_unk, vars_in_term_nvar);
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
to_visit--;
CELL *headp = to_visit->ptd0;
pt0 = to_visit->pt0;
pt0_end = to_visit->pt0_end;
if (IsAtomTerm(*headp) &&
(CELL *)AtomOfTerm(*headp) >= (CELL *)to_visit0 &&
(CELL *)AtomOfTerm(*headp) < (CELL *)to_visit_max) {
*to_visit->ptd0 = to_visit->d0;
}
}
goto restart;
}
/* Do we still have compound terms to visit */
if (to_visit > to_visit0) {
to_visit--;
pt0 = to_visit->pt0;
pt0_end = to_visit->pt0_end;
CELL *ptd0 = to_visit->ptd0;
if (!IsVarTerm(*ptd0))
*ptd0 = to_visit->d0;
goto restart;
}
pop_text_stack(lvl);
return 0;
def_aux_overflow();
}
Term Yap_CheckLoops(Term inp, UInt arity_REGS) {
Term Yap_CheckLoops(Term inp, UInt arity, Term *listp, Term *endp USES_REGS) {
Term t = Deref(inp);
return t;
if (IsPrimitiveTerm(t)) {
if (IsVarTerm(t) || IsPrimitiveTerm(t)) {
return t;
} else {
Int res;
res = loops_in_complex_term(&t - 1, &t PASS_REGS) - 1;
res = loops_in_complex_term((&t) - 1, &t, listp, endp PASS_REGS);
if (res < 0)
return -1;
return t;
}
}
/** @pred rational_term_to_tree(? _TI_,- _TF_, ?SubTerms, ?MoreSubterms)
The term _TF_ is a forest representation (without cycles) for
the Prolog term _TI_. The term _TF_ is the main term. The
difference list _SubTerms_-_MoreSubterms_ stores terms of the
form _V=T_, where _V_ is a new variable occuring in _TF_, and
_T_ is a copy of a sub-term from _TI_.
*/
static Int p_break_rational(USES_REGS1)
{
Term t = Yap_CopyTerm(Deref(ARG1));
Term l = Deref(ARG4), k;
return Yap_unify(Yap_CheckLoops(t, 4, &k, &l PASS_REGS), ARG2) && Yap_unify(k, ARG3);
}
void Yap_InitTermCPreds(void) {
Yap_InitCPred("rational_term_to_tree", 4, p_break_rational, 0);
Yap_InitCPred("term_variables", 2, p_term_variables, 0);
Yap_InitCPred("term_variables", 3, p_term_variables3, 0);
Yap_InitCPred("$variables_in_term", 3, p_variables_in_term, 0);
@ -1377,4 +1434,5 @@ void Yap_InitTermCPreds(void) {
Yap_InitCPred("ground", 1, p_ground, SafePredFlag);
Yap_InitCPred("numbervars", 3, p_numbervars, 0);
Yap_InitCPred("largest_numbervar", 2, largest_numbervar, 0);
}

13
C/utilpreds.c
View File

@ -3847,19 +3847,6 @@ void Yap_InitUtilCPreds(void)
*/
Yap_InitCPred("is_list", 1, p_is_list, SafePredFlag|TestPredFlag);
Yap_InitCPred("$is_list_or_partial_list", 1, p_is_list_or_partial_list, SafePredFlag|TestPredFlag);
Yap_InitCPred("rational_term_to_tree", 4, p_break_rational, 0);
/** @pred rational_term_to_tree(? _TI_,- _TF_, ?SubTerms, ?MoreSubterms)
The term _TF_ is a forest representation (without cycles and repeated
terms) for the Prolog term _TI_. The term _TF_ is the main term. The
difference list _SubTerms_-_MoreSubterms_ stores terms of the form
_V=T_, where _V_ is a new variable occuring in _TF_, and _T_ is a copy
of a sub-term from _TI_.
*/
Yap_InitCPred("term_factorized", 3, p_break_rational3, 0);
/** @pred term_factorized(? _TI_,- _TF_, ?SubTerms)

4
C/write.c
View File

@ -1109,9 +1109,9 @@ void Yap_plwrite(Term t, StreamDesc *mywrite, int max_depth, int flags,
wglb.Write_strings = flags & BackQuote_String_f;
// if (!(flags & Ignore_cyclics_f) && false)
{
t = Yap_CheckLoops(t, 1);
t = Yap_CheckLoops(t, 1, NULL, NULL PASS_REGS);
}
/* protect slots for portray */
/* protect slots for portray */
writeTerm(t, priority, 1, FALSE, &wglb, &rwt);
if (flags & New_Line_f) {
if (flags & Fullstop_f) {

2
H/Yapproto.h
View File

@ -445,7 +445,7 @@ bool Yap_isDirectory(const char *FileName);
extern bool Yap_Exists(const char *f);
/* terms.c */
extern Term Yap_CheckLoops(Term inp, UInt arity USES_REGS);
extern Term Yap_CheckLoops(Term inp, UInt arity, Term *listp, Term *endp USES_REGS);
extern void Yap_InitTermCPreds(void);
/* threads.c */

2
pl/absf.yap
View File

@ -90,12 +90,10 @@ absolute_file_name__(File,LOpts,TrueFileName) :-
'$absf_port'(fail, File, TrueFileName, HasSol, OldF, PreviousFileErrors, PreviousVerbose, Expand, Verbose, TakeFirst, FileErrors ).
:- start_low_level_trace.
prolog:core_file_name(Name, Opts) -->
'$file_name'(Name, Opts, E),
'$suffix'(E, Opts),
'$glob'(Opts).
:- stop_low_level_trace.
%
% handle library(lists) or foreign(jpl)
%