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yap-6.3/C/attvar.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: attvar.c *
* Last rev: *
* mods: *
* comments: YAP support for attributed vars *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[]="%W% %G%";
#endif
#include "Yap.h"
#include "Yatom.h"
#include "Heap.h"
#include "heapgc.h"
#include "attvar.h"
#ifndef NULL
#define NULL (void *)0
#endif
#ifdef COROUTINING
#define TermVoidAtt TermFoundVar
static CELL *
AddToQueue(attvar_record *attv)
{
Term t[2];
Term WGs, ng;
t[0] = (CELL)&(attv->Done);
t[1] = attv->Value;
/* follow the chain */
WGs = Yap_ReadTimedVar(WokenGoals);
ng = Yap_MkApplTerm(FunctorAttGoal, 2, t);
Yap_UpdateTimedVar(WokenGoals, MkPairTerm(ng, WGs));
if ((Term)WGs == TermNil) {
/* from now on, we have to start waking up goals */
Yap_signal(YAP_WAKEUP_SIGNAL);
}
return(RepAppl(ng)+2);
}
static void
AddFailToQueue(void)
{
Term WGs;
/* follow the chain */
WGs = Yap_ReadTimedVar(WokenGoals);
Yap_UpdateTimedVar(WokenGoals, MkPairTerm(MkAtomTerm(AtomFail),WGs));
if ((Term)WGs == TermNil) {
/* from now on, we have to start waking up goals */
Yap_signal(YAP_WAKEUP_SIGNAL);
}
}
static int
CopyAttVar(CELL *orig, CELL ***to_visit_ptr, CELL *res)
{
register attvar_record *attv = (attvar_record *)orig;
register attvar_record *newv;
CELL **to_visit = *to_visit_ptr;
CELL *vt;
/* add a new attributed variable */
newv = DelayTop();
if (H0 - (CELL *)newv < 1024)
return FALSE;
RESET_VARIABLE(&(newv->Value));
RESET_VARIABLE(&(newv->Done));
vt = &(attv->Atts);
to_visit[0] = vt-1;
to_visit[1] = vt;
if (IsVarTerm(attv->Atts)) {
newv->Atts = (CELL)H;
to_visit[2] = H;
H++;
} else {
to_visit[2] = &(newv->Atts);
}
to_visit[3] = (CELL *)vt[-1];
*to_visit_ptr = to_visit+4;
*res = (CELL)&(newv->Done);
SetDelayTop(newv+1);
return TRUE;
}
static Term
AttVarToTerm(CELL *orig)
{
attvar_record *attv = (attvar_record *)orig;
return attv->Atts;
}
static attvar_record *
BuildNewAttVar(void)
{
attvar_record *attv = DelayTop();
if (H0 - (CELL *)(attv+1) < 1024) {
return NULL;
}
RESET_VARIABLE(&(attv->Done));
RESET_VARIABLE(&(attv->Value));
RESET_VARIABLE(&(attv->Atts));
SetDelayTop(attv+1);
return attv;
}
static int
TermToAttVar(Term attvar, Term to)
{
attvar_record *attv = BuildNewAttVar();
if (!attv)
return FALSE;
attv->Atts = attvar;
*VarOfTerm(to) = (CELL)attv;
return TRUE;
}
static void
WakeAttVar(CELL* pt1, CELL reg2)
{
/* if bound to someone else, follow until we find the last one */
attvar_record *attv = (attvar_record *)pt1;
CELL *myH = H;
CELL *bind_ptr;
if (IsVarTerm(reg2)) {
if (pt1 == VarOfTerm(reg2))
return;
if (IsAttachedTerm(reg2)) {
attvar_record *susp2 = (attvar_record *)VarOfTerm(reg2);
/* binding two suspended variables, be careful */
if (susp2 >= attv) {
if (!IsVarTerm(susp2->Value) || !IsUnboundVar(&susp2->Value)) {
/* oops, our goal is on the queue to be woken */
if (!Yap_unify(susp2->Value, (CELL)pt1)) {
AddFailToQueue();
}
}
Bind_Global(&(susp2->Value), (CELL)pt1);
AddToQueue(susp2);
return;
}
} else {
Bind(VarOfTerm(reg2), (CELL)pt1);
return;
}
}
if (!IsVarTerm(attv->Value) || !IsUnboundVar(&attv->Value)) {
/* oops, our goal is on the queue to be woken */
if (!Yap_unify(attv->Value, reg2)) {
AddFailToQueue();
}
return;
}
bind_ptr = AddToQueue(attv);
if (IsNonVarTerm(reg2)) {
if (IsPairTerm(reg2) && RepPair(reg2) == myH)
reg2 = AbsPair(H);
else if (IsApplTerm(reg2) && RepAppl(reg2) == myH)
reg2 = AbsAppl(H);
}
*bind_ptr = reg2;
Bind_Global(&(attv->Value), reg2);
}
void
Yap_WakeUp(CELL *pt0) {
CELL d0 = *pt0;
RESET_VARIABLE(pt0);
TR--;
WakeAttVar(pt0, d0);
}
static void
mark_attvar(CELL *orig)
{
register attvar_record *attv = (attvar_record *)orig;
Yap_mark_external_reference(&(attv->Value));
Yap_mark_external_reference(&(attv->Done));
Yap_mark_external_reference(&(attv->Atts));
}
#if FROZEN_STACKS
static Term
CurrentTime(void) {
return(MkIntegerTerm(TR-(tr_fr_ptr)Yap_TrailBase));
}
#endif
static Term
BuildAttTerm(Functor mfun, UInt ar)
{
CELL *h0 = H;
UInt i;
if (H+(1024+ar) > ASP) {
return 0L;
}
H[0] = (CELL)mfun;
RESET_VARIABLE(H+1);
H += 2;
for (i = 1; i< ar; i++) {
*H = TermVoidAtt;
H++;
}
return AbsAppl(h0);
}
static Term
SearchAttsForModule(Term start, Functor mfun)
{
do {
if (IsVarTerm(start) ||
FunctorOfTerm(start) == mfun)
return start;
start = ArgOfTerm(1,start);
} while (TRUE);
}
static Term
SearchAttsForModuleName(Term start, Atom mname)
{
do {
if (IsVarTerm(start) ||
NameOfFunctor(FunctorOfTerm(start)) == mname)
return start;
start = ArgOfTerm(1,start);
} while (TRUE);
}
static void
AddNewModule(attvar_record *attv, Term t, int new, int do_it)
{
CELL *newp = RepAppl(t)+2;
UInt i, ar = ArityOfFunctor((Functor)newp[-2]);
for (i=1; i< ar; i++) {
Term n = Deref(*newp);
if (n == TermFreeTerm) {
*newp = TermVoidAtt;
} else {
if (n != TermVoidAtt)
do_it = TRUE;
}
newp++;
}
if (!do_it)
return;
if (IsVarTerm(attv->Atts)) {
if (new) {
attv->Atts = t;
} else {
Bind(&(attv->Atts),t);
}
} else {
Term *wherep = &attv->Atts;
do {
if (IsVarTerm(*wherep)) {
Bind_Global(wherep,t);
return;
} else {
wherep = RepAppl(Deref(*wherep))+1;
}
} while (TRUE);
}
}
static void
ReplaceAtts(attvar_record *attv, Term oatt, Term att)
{
UInt ar = ArityOfFunctor(FunctorOfTerm(oatt)), i;
CELL *oldp = RepAppl(oatt)+1;
CELL *newp;
if (oldp > HB) {
oldp++;
newp = RepAppl(att)+2;
/* if deterministic */
for (i=1; i< ar; i++) {
Term n = Deref(*newp);
if (n != TermFreeTerm) {
*oldp = n;
}
oldp++;
newp++;
}
return;
}
newp = RepAppl(att)+1;
*newp++ = *oldp++;
for (i=1; i< ar; i++) {
Term n = Deref(*newp);
if (n == TermFreeTerm) {
*newp = Deref(*oldp);
}
oldp++;
newp++;
}
if (attv->Atts == oatt) {
if (RepAppl(attv->Atts) >= HB)
attv->Atts = att;
else
MaBind(&(attv->Atts), att);
} else {
Term *wherep = &attv->Atts;
do {
if (*wherep == oatt) {
MaBind(wherep, att);
return;
} else {
wherep = RepAppl(Deref(*wherep))+1;
}
} while (TRUE);
}
}
static void
DelAtts(attvar_record *attv, Term oatt)
{
if (attv->Atts == oatt) {
if (RepAppl(attv->Atts) >= HB)
attv->Atts = ArgOfTerm(1,oatt);
else
MaBind(&(attv->Atts), ArgOfTerm(1,oatt));
} else {
Term *wherep = &attv->Atts;
do {
if (*wherep == oatt) {
MaBind(wherep, ArgOfTerm(1,oatt));
return;
} else {
wherep = RepAppl(Deref(*wherep))+1;
}
} while (TRUE);
}
}
static void
PutAtt(Int pos, Term atts, Term att)
{
if (IsVarTerm(att) && (CELL *)att > H && (CELL *)att < LCL0) {
/* globalise locals */
Term tnew = MkVarTerm();
Bind((CELL *)att, tnew);
att = tnew;
}
MaBind(RepAppl(atts)+pos, att);
}
static Int
BindAttVar(attvar_record *attv) {
if (IsVarTerm(attv->Done) && IsUnboundVar(&attv->Done)) {
/* make sure we are not trying to bind a variable against itself */
if (!IsVarTerm(attv->Value)) {
Bind_Global(&(attv->Done), attv->Value);
} else if (IsVarTerm(attv->Value)) {
Term t = Deref(attv->Value);
if (IsVarTerm(t)) {
if (IsAttachedTerm(t)) {
attvar_record *attv2 = (attvar_record *)VarOfTerm(t);
if (attv2 < attv) {
Bind_Global(&(attv->Done), t);
} else {
Bind_Global(&(attv2->Done), (CELL)attv);
}
} else {
Yap_Error(SYSTEM_ERROR,(CELL)&(attv->Done),"attvar was bound when unset");
return(FALSE);
}
} else {
Bind_Global(&(attv->Done), t);
}
}
return(TRUE);
} else {
Yap_Error(SYSTEM_ERROR,(CELL)&(attv->Done),"attvar was bound when set");
return(FALSE);
}
}
static Term
GetAllAtts(attvar_record *attv) {
/* check if we are already there */
return attv->Atts;
}
static Term
AllAttVars(attvar_record *attv) {
CELL *h0 = H;
attvar_record *max = DelayTop();
while (attv != max) {
if (ASP - H < 1024) {
H = h0;
return 0L;
}
if (IsVarTerm(attv->Done) && IsUnboundVar(&attv->Done)) {
if (IsIntegerTerm(attv->Atts)) {
/* skip call residue(s) */
UInt n = IntegerOfTerm(attv->Atts)-1;
attv += n;
} else {
if (H != h0) {
H[-1] = AbsPair(H);
}
H[0] = (CELL)attv;
H += 2;
}
}
attv++;
}
if (H != h0) {
H[-1] = TermNil;
return AbsPair(h0);
} else {
return TermNil;
}
}
static Int
p_put_att(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
attvar_record *attv;
Atom modname = AtomOfTerm(Deref(ARG2));
UInt ar = IntegerOfTerm(Deref(ARG3));
Functor mfun;
Term tatts;
int new = FALSE;
if (IsAttachedTerm(inp)) {
attv = (attvar_record *)VarOfTerm(inp);
} else {
while (!(attv = BuildNewAttVar())) {
if (!Yap_growglobal(NULL)) {
Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_ErrorMessage);
return FALSE;
}
inp = Deref(ARG1);
}
new = TRUE;
}
mfun= Yap_MkFunctor(modname,ar);
if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun))) {
while (!(tatts = BuildAttTerm(mfun,ar))) {
if (!Yap_gc(5, ENV, P)) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
return FALSE;
}
}
Yap_unify(ARG1, (Term)attv);
AddNewModule(attv,tatts,new,TRUE);
}
PutAtt(IntegerOfTerm(Deref(ARG4)), tatts, Deref(ARG5));
return TRUE;
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
return(FALSE);
}
}
static Int
p_put_att_term(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
attvar_record *attv;
int new = FALSE;
if (IsAttachedTerm(inp)) {
attv = (attvar_record *)VarOfTerm(inp);
} else {
while (!(attv = BuildNewAttVar())) {
if (!Yap_growglobal(NULL)) {
Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_ErrorMessage);
return FALSE;
}
inp = Deref(ARG1);
}
new = TRUE;
}
if (new) {
attv->Atts = Deref(ARG2);
} else {
MaBind(&(attv->Atts), Deref(ARG2));
}
return TRUE;
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
return(FALSE);
}
}
static Int
p_rm_att(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
attvar_record *attv;
Atom modname = AtomOfTerm(Deref(ARG2));
UInt ar = IntegerOfTerm(Deref(ARG3));
Functor mfun;
Term tatts;
int new = FALSE;
if (IsAttachedTerm(inp)) {
attv = (attvar_record *)VarOfTerm(inp);
} else {
while (!(attv = BuildNewAttVar())) {
if (!Yap_growglobal(NULL)) {
Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_ErrorMessage);
return FALSE;
}
inp = Deref(ARG1);
}
new = TRUE;
Yap_unify(ARG1, (Term)attv);
}
mfun= Yap_MkFunctor(modname,ar);
if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun))) {
while (!(tatts = BuildAttTerm(mfun,ar))) {
if (!Yap_gc(4, ENV, P)) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
return FALSE;
}
}
AddNewModule(attv,tatts,new, FALSE);
} else {
PutAtt(IntegerOfTerm(Deref(ARG4)), tatts, TermVoidAtt);
}
return TRUE;
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
return(FALSE);
}
}
static Int
p_put_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
Term otatts;
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
attvar_record *attv;
Term tatts = Deref(ARG2);
Functor mfun = FunctorOfTerm(tatts);
int new = FALSE;
if (IsAttachedTerm(inp)) {
attv = (attvar_record *)VarOfTerm(inp);
} else {
while (!(attv = BuildNewAttVar())) {
if (!Yap_growglobal(NULL)) {
Yap_Error(OUT_OF_ATTVARS_ERROR, ARG1, Yap_ErrorMessage);
return FALSE;
}
tatts = Deref(ARG2);
}
new = TRUE;
Yap_unify(ARG1, (Term)attv);
}
if (IsVarTerm(otatts = SearchAttsForModule(attv->Atts,mfun))) {
AddNewModule(attv,tatts,new,FALSE);
} else {
ReplaceAtts(attv, otatts, tatts);
}
return TRUE;
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
return FALSE;
}
}
static Int
p_del_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
Term otatts;
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
attvar_record *attv;
Term tatts = Deref(ARG2);
Functor mfun = FunctorOfTerm(tatts);
if (IsAttachedTerm(inp)) {
attv = (attvar_record *)VarOfTerm(inp);
} else {
return TRUE;
}
if (IsVarTerm(otatts = SearchAttsForModule(attv->Atts,mfun))) {
return TRUE;
} else {
DelAtts(attv, otatts);
}
return TRUE;
} else {
return TRUE;
}
}
static Int
p_get_att(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
Atom modname = AtomOfTerm(Deref(ARG2));
if (IsAttachedTerm(inp)) {
attvar_record *attv;
Term tout, tatts;
attv = (attvar_record *)VarOfTerm(inp);
if (IsVarTerm(tatts = SearchAttsForModuleName(attv->Atts,modname)))
return FALSE;
tout = ArgOfTerm(IntegerOfTerm(Deref(ARG3)),tatts);
if (tout == TermVoidAtt) return FALSE;
return Yap_unify(tout, ARG4);
} else {
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
return FALSE;
}
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
return(FALSE);
}
}
static Int
p_free_att(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
Atom modname = AtomOfTerm(Deref(ARG2));
if (IsAttachedTerm(inp)) {
attvar_record *attv;
Term tout, tatts;
attv = (attvar_record *)VarOfTerm(inp);
if (IsVarTerm(tatts = SearchAttsForModuleName(attv->Atts,modname)))
return TRUE;
tout = ArgOfTerm(IntegerOfTerm(Deref(ARG3)),tatts);
return (tout == TermVoidAtt);
} else {
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
return TRUE;
}
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"put_attributes/2");
return(FALSE);
}
}
static Int
p_get_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
if (IsAttachedTerm(inp)) {
attvar_record *attv;
Term tatts;
Term access = Deref(ARG2);
Functor mfun = FunctorOfTerm(access);
UInt ar, i;
CELL *old, *new;
attv = (attvar_record *)VarOfTerm(inp);
if (IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun)))
return FALSE;
ar = ArityOfFunctor(mfun);
new = RepAppl(access)+2;
old = RepAppl(tatts)+2;
for (i = 1; i < ar; i++,new++,old++) {
if (*new != TermFreeTerm) {
if (*old == TermVoidAtt && *new != TermVoidAtt)
return FALSE;
if (*new == TermVoidAtt && *old != TermVoidAtt)
return FALSE;
if (!Yap_unify(*new,*old)) return FALSE;
}
}
return TRUE;
} else {
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
return FALSE;
}
} else {
// Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_attributes/2");
return(FALSE);
}
}
static Int
p_has_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
if (IsAttachedTerm(inp)) {
attvar_record *attv;
Term tatts;
Term access = Deref(ARG2);
Functor mfun = FunctorOfTerm(access);
attv = (attvar_record *)VarOfTerm(inp);
return !IsVarTerm(tatts = SearchAttsForModule(attv->Atts,mfun));
} else {
/* Yap_Error(INSTANTIATION_ERROR,inp,"get_att/2"); */
return FALSE;
}
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"has_attributes/2");
return(FALSE);
}
}
static Int
p_bind_attvar(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
if (IsAttachedTerm(inp)) {
attvar_record *attv = (attvar_record *)VarOfTerm(inp);
return(BindAttVar(attv));
}
return(TRUE);
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"bind_att/2");
return(FALSE);
}
}
static Int
p_get_all_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
if (IsAttachedTerm(inp)) {
attvar_record *attv = (attvar_record *)VarOfTerm(inp);
return Yap_unify(ARG2,GetAllAtts(attv));
}
return TRUE;
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_att/2");
return FALSE;
}
}
static int
ActiveAtt(Term tatt, UInt ar)
{
CELL *cp = RepAppl(tatt)+1;
UInt i;
for (i = 1; i < ar; i++) {
if (cp[i] != TermVoidAtt)
return TRUE;
}
return FALSE;
}
static Int
p_modules_with_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
if (IsAttachedTerm(inp)) {
attvar_record *attv = (attvar_record *)VarOfTerm(inp);
CELL *h0 = H;
Term tatt;
if (IsVarTerm(tatt = attv->Atts))
return Yap_unify(ARG2,TermNil);
while (!IsVarTerm(tatt)) {
Functor f = FunctorOfTerm(tatt);
if (H != h0)
H[-1] = AbsPair(H);
if (ActiveAtt(tatt, ArityOfFunctor(f))) {
*H = MkAtomTerm(NameOfFunctor(f));
H+=2;
}
tatt = ArgOfTerm(1,tatt);
}
if (h0 != H) {
H[-1] = TermNil;
return Yap_unify(ARG2,AbsPair(h0));
}
}
return Yap_unify(ARG2,TermNil);
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_att/2");
return FALSE;
}
}
static Int
p_swi_all_atts(void) {
/* receive a variable in ARG1 */
Term inp = Deref(ARG1);
Functor attf = Yap_MkFunctor(Yap_LookupAtom("att"),3);
/* if this is unbound, ok */
if (IsVarTerm(inp)) {
if (IsAttachedTerm(inp)) {
attvar_record *attv = (attvar_record *)VarOfTerm(inp);
CELL *h0 = H;
Term tatt;
if (IsVarTerm(tatt = attv->Atts))
return Yap_unify(ARG2,TermNil);
while (!IsVarTerm(tatt)) {
Functor f = FunctorOfTerm(tatt);
if (ArityOfFunctor(f) == 2) {
if (H != h0)
H[-1] = AbsAppl(H);
H[0] = (CELL) attf;
H[1] = MkAtomTerm(NameOfFunctor(f));
H[2] = ArgOfTerm(2,tatt);
H+=4;
}
tatt = ArgOfTerm(1,tatt);
}
if (h0 != H) {
H[-1] = TermNil;
return Yap_unify(ARG2,AbsAppl(h0));
}
}
return Yap_unify(ARG2,TermNil);
} else {
Yap_Error(TYPE_ERROR_VARIABLE,inp,"get_att/2");
return FALSE;
}
}
static Int
p_all_attvars(void)
{
do {
Term out;
attvar_record *base;
base = (attvar_record *)Yap_GlobalBase+IntegerOfTerm(Yap_ReadTimedVar(AttsMutableList));
if (!(out = AllAttVars(base))) {
if (!Yap_gc(1, ENV, P)) {
Yap_Error(OUT_OF_STACK_ERROR, TermNil, Yap_ErrorMessage);
return FALSE;
}
} else {
return Yap_unify(ARG1,out);
}
} while (TRUE);
}
static Int
p_is_attvar(void)
{
Term t = Deref(ARG1);
return(IsVarTerm(t) &&
IsAttachedTerm(t));
}
/* check if we are not redoing effort */
static Int
p_attvar_bound(void)
{
Term t = Deref(ARG1);
return(IsVarTerm(t) &&
IsAttachedTerm(t) &&
!IsUnboundVar(&((attvar_record *)VarOfTerm(t))->Done));
}
static Int
p_void_term(void)
{
return Yap_unify(ARG1,TermVoidAtt);
}
static Int
p_free_term(void)
{
return Yap_unify(ARG1,TermFreeTerm);
}
#else
static Int
p_all_attvars(void)
{
return FALSE;
}
static Int
p_is_attvar(void)
{
return FALSE;
}
static Int
p_attvar_bound(void)
{
return FALSE;
}
#endif /* COROUTINING */
void Yap_InitAttVarPreds(void)
{
Term OldCurrentModule = CurrentModule;
CurrentModule = ATTRIBUTES_MODULE;
#ifdef COROUTINING
attas[attvars_ext].bind_op = WakeAttVar;
attas[attvars_ext].copy_term_op = CopyAttVar;
attas[attvars_ext].to_term_op = AttVarToTerm;
attas[attvars_ext].term_to_op = TermToAttVar;
attas[attvars_ext].mark_op = mark_attvar;
Yap_InitCPred("get_att", 4, p_get_att, SafePredFlag);
Yap_InitCPred("get_module_atts", 2, p_get_atts, SafePredFlag);
Yap_InitCPred("has_module_atts", 2, p_has_atts, SafePredFlag);
Yap_InitCPred("get_all_atts", 2, p_get_all_atts, SafePredFlag);
Yap_InitCPred("get_all_swi_atts", 2, p_swi_all_atts, SafePredFlag);
Yap_InitCPred("free_att", 3, p_free_att, SafePredFlag);
Yap_InitCPred("put_att", 5, p_put_att, 0);
Yap_InitCPred("put_att_term", 5, p_put_att_term, 0);
Yap_InitCPred("put_module_atts", 2, p_put_atts, 0);
Yap_InitCPred("del_all_module_atts", 2, p_del_atts, 0);
Yap_InitCPred("rm_att", 4, p_rm_att, 0);
Yap_InitCPred("bind_attvar", 1, p_bind_attvar, SafePredFlag);
Yap_InitCPred("modules_with_attributes", 2, p_modules_with_atts, SafePredFlag);
Yap_InitCPred("void_term", 1, p_void_term, SafePredFlag);
Yap_InitCPred("free_term", 1, p_free_term, SafePredFlag);
#endif /* COROUTINING */
Yap_InitCPred("all_attvars", 1, p_all_attvars, 0);
CurrentModule = OldCurrentModule;
Yap_InitCPred("attvar", 1, p_is_attvar, SafePredFlag|TestPredFlag);
Yap_InitCPred("$att_bound", 1, p_attvar_bound, SafePredFlag|TestPredFlag|HiddenPredFlag);
}