/*-------------------------------------------------------------------------*
* PL_BETWEEN_3 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Between_3(WamWord l_word, WamWord u_word, WamWord i_word)
{
WamWord word, tag_mask;
PlLong l, u, i;
l = Pl_Rd_Integer_Check(l_word);
u = Pl_Rd_Integer_Check(u_word);
DEREF(i_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK)
{
i = Pl_Rd_Integer_Check(word);
return i >= l && i <= u;
}
i_word = word;
if (l > u)
return FALSE;
/* here i_word is a variable */
if (l < u) /* non deterministic case */
{
A(0) = l + 1;
A(1) = u;
A(2) = i_word;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(BETWEEN_ALT, 0), 3);
}
return Pl_Get_Integer(l, i_word); /* always TRUE */
}
/*-------------------------------------------------------------------------*
* PL_CURRENT_STREAM_1 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Current_Stream_1(WamWord stm_word)
{
WamWord word, tag_mask;
int stm = 0;
DEREF(stm_word, word, tag_mask); /* either an INT or a REF */
if (tag_mask == TAG_INT_MASK)
{
stm = UnTag_INT(word);
return (stm >= 0 && stm <= pl_stm_last_used && pl_stm_tbl[stm] != NULL);
}
for (; stm <= pl_stm_last_used; stm++)
if (pl_stm_tbl[stm])
break;
if (stm >= pl_stm_last_used)
{
if (stm > pl_stm_last_used)
return FALSE;
}
else /* non deterministic case */
{
A(0) = stm_word;
A(1) = stm + 1;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(CURRENT_STREAM_ALT, 0),
2);
}
return Pl_Get_Integer(stm, stm_word);
}
/*-------------------------------------------------------------------------*
* PL_CURRENT_ATOM_2 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Current_Atom_2(WamWord atom_word, WamWord hide_word)
{
WamWord word, tag_mask;
Bool hide;
int atom;
hide = Pl_Rd_Integer_Check(hide_word);
DEREF(atom_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK)
return *Pl_Rd_String_Check(word) != '$' || !hide;
atom = -1;
for (;;)
{
atom = Pl_Find_Next_Atom(atom);
if (atom == -1)
return FALSE;
if (!hide || pl_atom_tbl[atom].name[0] != '$')
break;
}
/* non deterministic case */
A(0) = atom_word;
A(1) = hide;
A(2) = atom;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(CURRENT_ATOM_ALT, 0), 3);
return Pl_Get_Atom(atom, atom_word);
}
/*-------------------------------------------------------------------------*
* PL_QUERY_BEGIN *
* *
*-------------------------------------------------------------------------*/
void
Pl_Query_Begin(Bool recoverable)
{
if (query_stack_top - query_stack >= QUERY_STACK_SIZE)
Pl_Fatal_Error("too many nested Pl_Query_Start() (max: %d)",
QUERY_STACK_SIZE);
if (recoverable)
Pl_Create_Choice_Point(Prolog_Predicate(PL_QUERY_RECOVER_ALT, 0), 0);
}
/*-------------------------------------------------------------------------*
* PL_RESET_PROLOG *
* *
* Reset top stack pointers and create first choice point (for Call_Prolog)*
*-------------------------------------------------------------------------*/
void
Pl_Reset_Prolog(void)
{
E = B = LSSA = Local_Stack;
H = heap_actual_start; /* restart after needed global terms */
TR = Trail_Stack;
CP = NULL;
STAMP = 0;
CS = Cstr_Stack;
BCI = 0; /* BCI only needed for byte-code (cf. bips prolog) */
Pl_Create_Choice_Point(Call_Prolog_Fail, 0); /* 1st choice point */
Pl_Fd_Reset_Solver();
}
/*-------------------------------------------------------------------------*
* PL_CURRENT_ALIAS_2 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Current_Alias_2(WamWord stm_word, WamWord alias_word)
{
WamWord word, tag_mask;
int stm;
HashScan scan;
AliasInf *alias;
AliasInf *save_alias;
stm = Pl_Rd_Integer_Check(stm_word); /* stm is a valid stream entry */
DEREF(alias_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK)
return Pl_Find_Stream_By_Alias(Pl_Rd_Atom_Check(word)) == stm;
for (alias = (AliasInf *) Pl_Hash_First(pl_alias_tbl, &scan); alias;
alias = (AliasInf *) Pl_Hash_Next(&scan))
if (alias->stm == stm)
break;
if (alias == NULL)
return FALSE;
save_alias = alias;
for (;;)
{
alias = (AliasInf *) Pl_Hash_Next(&scan);
if (alias == NULL || alias->stm == stm)
break;
}
if (alias) /* non deterministic case */
{
A(0) = stm;
A(1) = alias_word;
A(2) = (WamWord) scan.endt;
A(3) = (WamWord) scan.cur_t;
A(4) = (WamWord) scan.cur_p;
A(5) = (WamWord) alias;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(CURRENT_ALIAS_ALT, 0),
6);
}
Pl_Get_Atom(save_alias->atom, alias_word);
return TRUE;
}
/*-------------------------------------------------------------------------*
* PL_CURRENT_MIRROR_2 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Current_Mirror_2(WamWord stm_word, WamWord m_stm_word)
{
int stm = Pl_Rd_Integer_Check(stm_word); /* stm is a valid stream entry */
StmInf *pstm = pl_stm_tbl[stm];
StmLst *m = pstm->mirror;
/* From here, the code also works with */
/* m = m_pstm->mirror_of. Could be used */
/* if m_stm_word is given and not stm_word */
if (m == NULL)
return FALSE;
if (m->next != NULL) /* non deterministic case */
{
A(0) = stm; /* useless in fact */
A(1) = m_stm_word;
A(2) = (WamWord) m->next;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(CURRENT_MIRROR_ALT, 0), 3);
}
return Pl_Get_Integer(m->stm, m_stm_word);
}
/*-------------------------------------------------------------------------*
* PL_GROUP_SOLUTIONS_3 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Group_Solutions_3(WamWord all_sol_word, WamWord gl_key_word,
WamWord sol_word)
{
WamWord word, tag_mask;
WamWord key_word;
DEREF(all_sol_word, word, tag_mask);
if (word == NIL_WORD)
return FALSE;
word = Group(all_sol_word, gl_key_word, &key_word);
if (word != NOT_A_WAM_WORD)
{
A(0) = word;
A(1) = gl_key_word;
A(2) = sol_word;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(GROUP_SOLUTIONS_ALT, 0), 3);
}
Pl_Unify(key_word, gl_key_word);
return Pl_Unify(sol_word, all_sol_word);
}
/*-------------------------------------------------------------------------*
* PL_SUB_ATOM_5 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Sub_Atom_5(WamWord atom_word, WamWord before_word, WamWord length_word,
WamWord after_word, WamWord sub_atom_word)
{
WamWord word, tag_mask;
AtomInf *patom;
AtomInf *psub_atom = NULL; /* only for the compiler */
int length;
PlLong b, l, a;
int b1, l1, a1;
Bool nondet;
int mask = 0;
char *str;
patom = pl_atom_tbl + Pl_Rd_Atom_Check(atom_word);
length = patom->prop.length;
DEREF_LG(before_word, b);
DEREF_LG(length_word, l);
DEREF_LG(after_word, a);
DEREF(sub_atom_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK && tag_mask != TAG_ATM_MASK)
Pl_Err_Type(pl_type_atom, word);
sub_atom_word = word;
if (tag_mask == TAG_ATM_MASK)
{
psub_atom = pl_atom_tbl + UnTag_ATM(word);
l = psub_atom->prop.length;
if (!Pl_Get_Integer(l, length_word))
return FALSE;
if ((mask & 5) == 5 && length != b + l + a) /* B and A fixed */
return FALSE;
if (mask & 4) /* B fixed */
{
a = length - b - l;
return strncmp(patom->name + b, psub_atom->name, l) == 0 &&
Pl_Get_Integer(a, after_word);
}
if (mask & 1) /* A fixed */
{
b = length - l - a;
return strncmp(patom->name + b, psub_atom->name, l) == 0 &&
Pl_Get_Integer(b, before_word);
}
mask = 8; /* set sub_atom as fixed */
}
switch (mask) /* mask <= 7, B L A (1: fixed, 0: var) */
{
case 0: /* nothing fixed */
case 2: /* L fixed */
case 4: /* B fixed */
a = length - b - l;
nondet = TRUE;
break;
case 1: /* A fixed */
l = length - b - a;
nondet = TRUE;
break;
case 3: /* L A fixed */
b = length - l - a;
nondet = FALSE;
break;
case 5: /* B A fixed */
l = length - b - a;
nondet = FALSE;
break;
case 6: /* B L fixed */
case 7: /* B L A fixed */
a = length - b - l;
nondet = FALSE;
break;
default: /* sub_atom fixed */
if ((str = strstr(patom->name + b, psub_atom->name)) == NULL)
return FALSE;
b = str - patom->name;
a = length - b - l;
nondet = TRUE;
break;
}
if (b < 0 || l < 0 || a < 0)
return FALSE;
if (nondet
&& Compute_Next_BLA(mask, patom, psub_atom, b, l, a, &b1, &l1, &a1))
{ /* non deterministic case */
A(0) = before_word;
A(1) = length_word;
A(2) = after_word;
A(3) = sub_atom_word;
A(4) = (WamWord) patom;
A(5) = (WamWord) psub_atom;
A(6) = mask;
A(7) = b1;
A(8) = l1;
A(9) = a1;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(SUB_ATOM_ALT, 0), 10);
}
if (mask <= 7)
{
MALLOC_STR(l);
strncpy(str, patom->name + b, l);
str[l] = '\0';
Pl_Get_Atom(Create_Malloc_Atom(str), sub_atom_word);
Pl_Get_Integer(l, length_word);
}
return Pl_Get_Integer(b, before_word) && Pl_Get_Integer(a, after_word);
}
/*-------------------------------------------------------------------------*
* PL_ATOM_CONCAT_3 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Atom_Concat_3(WamWord atom1_word, WamWord atom2_word, WamWord atom3_word)
{
WamWord word, tag_mask;
int tag1, tag2, tag3;
AtomInf *patom1, *patom2, *patom3;
char *str;
int l;
DEREF(atom1_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK && tag_mask != TAG_ATM_MASK)
Pl_Err_Type(pl_type_atom, atom1_word);
tag1 = tag_mask;
atom1_word = word;
DEREF(atom2_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK && tag_mask != TAG_ATM_MASK)
Pl_Err_Type(pl_type_atom, atom2_word);
tag2 = tag_mask;
atom2_word = word;
DEREF(atom3_word, word, tag_mask);
if (tag_mask != TAG_REF_MASK && tag_mask != TAG_ATM_MASK)
Pl_Err_Type(pl_type_atom, atom3_word);
tag3 = tag_mask;
atom3_word = word;
if (tag3 == TAG_REF_MASK && (tag1 == TAG_REF_MASK || tag2 == TAG_REF_MASK))
Pl_Err_Instantiation();
if (tag1 == TAG_ATM_MASK)
{
patom1 = pl_atom_tbl + UnTag_ATM(atom1_word);
if (tag2 == TAG_ATM_MASK)
{
patom2 = pl_atom_tbl + UnTag_ATM(atom2_word);
l = patom1->prop.length + patom2->prop.length;
MALLOC_STR(l);
strcpy(str, patom1->name);
strcpy(str + patom1->prop.length, patom2->name);
return Pl_Get_Atom(Create_Malloc_Atom(str), atom3_word);
}
patom3 = pl_atom_tbl + UnTag_ATM(atom3_word);
l = patom3->prop.length - patom1->prop.length;
if (l < 0 || strncmp(patom1->name, patom3->name, patom1->prop.length) != 0)
return FALSE;
MALLOC_STR(l);
strcpy(str, patom3->name + patom1->prop.length);
return Pl_Get_Atom(Create_Malloc_Atom(str), atom2_word);
}
if (tag2 == TAG_ATM_MASK) /* here tag1 == REF */
{
patom2 = pl_atom_tbl + UnTag_ATM(atom2_word);
patom3 = pl_atom_tbl + UnTag_ATM(atom3_word);
l = patom3->prop.length - patom2->prop.length;
if (l < 0 || strncmp(patom2->name, patom3->name + l, patom2->prop.length) != 0)
return FALSE;
MALLOC_STR(l);
strncpy(str, patom3->name, l);
str[l] = '\0';
return Pl_Get_Atom(Create_Malloc_Atom(str), atom1_word);
}
/* A1 and A2 are variables: non deterministic case */
patom3 = pl_atom_tbl + UnTag_ATM(atom3_word);
if (patom3->prop.length > 0)
{
A(0) = atom1_word;
A(1) = atom2_word;
A(2) = (WamWord) patom3;
A(3) = (WamWord) (patom3->name + 1);
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(ATOM_CONCAT_ALT, 0), 4);
}
return Pl_Get_Atom(pl_atom_void, atom1_word) &&
Pl_Get_Atom_Tagged(atom3_word, atom2_word);
}
/*-------------------------------------------------------------------------*
* PL_FOREIGN_CREATE_CHOICE *
* *
*-------------------------------------------------------------------------*/
void
Pl_Foreign_Create_Choice(CodePtr codep_alt, int arity, int choice_size)
{
A(arity) = -1; /* bkt_counter */
Pl_Create_Choice_Point(codep_alt, arity + 1 + choice_size);
}
/*-------------------------------------------------------------------------*
* PL_CURRENT_PREDICATE_2 *
* *
*-------------------------------------------------------------------------*/
Bool
Pl_Current_Predicate_2(WamWord pred_indic_word, WamWord which_preds_word)
{
WamWord name_word, arity_word;
HashScan scan;
PredInf *pred;
int func, arity;
int func1, arity1;
int which_preds; /* 0=user, 1=user+bips, 2=user+bips+system */
Bool all;
func = Pl_Get_Pred_Indicator(pred_indic_word, FALSE, &arity);
name_word = pl_pi_name_word;
arity_word = pl_pi_arity_word;
which_preds = Pl_Rd_Integer(which_preds_word);
if (which_preds == 0 && !Flag_Value(FLAG_STRICT_ISO))
which_preds = 1;
#define Pred_Is_Ok(pred, func, which_preds) \
(which_preds == 2 || (pl_atom_tbl[func].name[0] != '$' && \
(which_preds == 1 || !(pred->prop & MASK_PRED_ANY_BUILTIN))))
if (func >= 0 && arity >= 0)
{
pred = Pl_Lookup_Pred(func, arity);
return pred && Pred_Is_Ok(pred, func, which_preds);
}
/* here func or arity == -1 (or both) */
all = (func == -1 && arity == -1);
pred = (PredInf *) Pl_Hash_First(pl_pred_tbl, &scan);
for (;;)
{
if (pred == NULL)
return FALSE;
func1 = Functor_Of(pred->f_n);
arity1 = Arity_Of(pred->f_n);
if ((all || func == func1 || arity == arity1) &&
Pred_Is_Ok(pred, func1, which_preds))
break;
pred = (PredInf *) Pl_Hash_Next(&scan);
}
/* non deterministic case */
A(0) = name_word;
A(1) = arity_word;
A(2) = which_preds;
A(3) = (WamWord) scan.endt;
A(4) = (WamWord) scan.cur_t;
A(5) = (WamWord) scan.cur_p;
Pl_Create_Choice_Point((CodePtr) Prolog_Predicate(CURRENT_PREDICATE_ALT, 0),
6);
return Pl_Get_Atom(Functor_Of(pred->f_n), name_word) &&
Pl_Get_Integer(Arity_Of(pred->f_n), arity_word);
/*
return Pl_Un_Atom_Check(Functor_Of(pred->f_n), name_word) &&
Pl_Un_Integer_Check(Arity_Of(pred->f_n), arity_word);
*/
}
