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91d1cf2c52
yap-6.3/C/exec.c
Vítor Santos Costa a26dbe0dfc init spelling and remove debugging
2015-11-05 16:38:18 +00:00

1912 lines
52 KiB
C
Executable File
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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: exec.c *
* Last rev: 8/2/88 *
* mods: *
* comments: Execute Prolog code *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "@(#)cdmgr.c 1.1 05/02/98";
#endif
#include "absmi.h"
#include "yapio.h"
#include "attvar.h"
#include "cut_c.h"
static Int CallPredicate(PredEntry *, choiceptr, yamop *CACHE_TYPE);
// must hold thread worker comm lock at call.
static Int EnterCreepMode(Term, Term CACHE_TYPE);
static Int current_choice_point(USES_REGS1);
static Int execute(USES_REGS1);
static Int execute0(USES_REGS1);
static Term cp_as_integer(choiceptr cp USES_REGS) {
return (MkIntegerTerm(LCL0 - (CELL *)cp));
}
static choiceptr cp_from_integer(Term cpt USES_REGS) {
return (choiceptr)(LCL0 - IntegerOfTerm(cpt));
}
Term Yap_cp_as_integer(choiceptr cp) {
CACHE_REGS
return cp_as_integer(cp PASS_REGS);
}
static inline Int CallPredicate(PredEntry *pen, choiceptr cut_pt,
yamop *code USES_REGS) {
#ifdef LOW_LEVEL_TRACER
if (Yap_do_low_level_trace)
low_level_trace(enter_pred, pen, XREGS + 1);
#endif /* LOW_LEVEL_TRACE */
#ifdef DEPTH_LIMIT
if (DEPTH <= MkIntTerm(1)) { /* I assume Module==0 is prolog */
if (pen->ModuleOfPred) {
if (DEPTH == MkIntTerm(0)) {
UNLOCK(pen->PELock);
return FALSE;
} else
DEPTH = RESET_DEPTH();
}
} else if (pen->ModuleOfPred)
DEPTH -= MkIntConstant(2);
#endif /* DEPTH_LIMIT */
if (P->opc != EXECUTE_CPRED_OP_CODE) {
// YENV[E_CP] = CP;
// YENV[E_E] = ENV;
//#ifdef DEPTH_LIMIT
// YENV[E_DEPTH] = DEPTH;
//#endif
// ENV = YENV;
ENV = YENV;
YENV = ASP;
CP = P;
}
/* make sure we have access to the user given cut */
YENV[E_CB] = (CELL)cut_pt;
P = code;
return TRUE;
}
inline static Int CallMetaCall(Term t, Term mod USES_REGS) {
// we have a creep requesr waiting
ARG1 = t;
ARG2 = cp_as_integer(B PASS_REGS); /* p_current_choice_point */
ARG3 = t;
if (mod) {
ARG4 = mod;
} else {
ARG4 = TermProlog;
}
if (Yap_GetGlobal(AtomDebugMeta) == TermOn) {
return CallPredicate(PredTraceMetaCall, B,
PredTraceMetaCall->CodeOfPred PASS_REGS);
} else {
return CallPredicate(PredMetaCall, B, PredMetaCall->CodeOfPred PASS_REGS);
}
}
Term Yap_ExecuteCallMetaCall(Term mod) {
CACHE_REGS
Term ts[4];
ts[0] = ARG1;
ts[1] = cp_as_integer(B PASS_REGS); /* p_current_choice_point */
ts[2] = ARG1;
ts[3] = mod;
if (Yap_GetGlobal(AtomDebugMeta) == TermOn) {
return Yap_MkApplTerm(PredTraceMetaCall->FunctorOfPred, 3, ts);
}
return Yap_MkApplTerm(PredMetaCall->FunctorOfPred, 4, ts);
}
Term Yap_PredicateIndicator(Term t, Term mod) {
CACHE_REGS
// generate predicate indicator in this case
Term ti[2];
t = Yap_StripModule(t, &mod);
if (IsApplTerm(t) && !IsExtensionFunctor(FunctorOfTerm(t))) {
ti[0] = MkAtomTerm(NameOfFunctor(FunctorOfTerm(t)));
ti[1] = MkIntegerTerm(ArityOfFunctor(FunctorOfTerm(t)));
} else if (IsPairTerm(t)) {
ti[0] = MkAtomTerm(AtomDot);
ti[1] = MkIntTerm(2);
} else {
ti[0] = t;
ti[1] = MkIntTerm(0);
}
t = Yap_MkApplTerm(FunctorSlash, 2, ti);
if (mod != CurrentModule) {
ti[0] = mod;
ti[1] = t;
return Yap_MkApplTerm(FunctorModule, 2, ti);
}
return t;
}
static Int CallError(yap_error_number err, Term t, Term mod USES_REGS) {
if (isoLanguageFlag()) {
return (CallMetaCall(t, mod PASS_REGS));
} else {
if (err == TYPE_ERROR_CALLABLE) {
t = Yap_StripModule(t, &mod);
}
Yap_Error(err, t, "call/1");
return FALSE;
}
}
/** @pred current_choice_point( -_CP_ )
*
* unify the logic variable _CP_ with a number that gives the offset of the
* current choice-point. This number is only valid as long as we do not
*backtrack by or cut
* _CP_, and is safe in the presence of stack shifting and/or garbage
*collection.
*/
static Int current_choice_point(USES_REGS1) {
Term t = Deref(ARG1);
Term td;
#if SHADOW_HB
register CELL *HBREG = HB;
#endif
if (!IsVarTerm(t))
return (FALSE);
td = cp_as_integer(B PASS_REGS);
YapBind((CELL *)t, td);
return TRUE;
}
static Int save_env_b(USES_REGS1) {
Term t = Deref(ARG1);
Term td;
#if SHADOW_HB
register CELL *HBREG = HB;
#endif
if (!IsVarTerm(t))
return (FALSE);
td = cp_as_integer((choiceptr)YENV[E_CB] PASS_REGS);
YapBind((CELL *)t, td);
return TRUE;
}
static Int trail_suspension_marker(USES_REGS1) {
Term t = Deref(ARG1);
TrailTerm(TR) = AbsPair((CELL *)t);
TR++;
return TRUE;
}
inline static Int do_execute(Term t, Term mod USES_REGS) {
Term t0 = t;
/* first do predicate expansion, even before you process signals.
This way you don't get to spy goal_expansion(). */
if (PRED_GOAL_EXPANSION_ALL) {
/* disable creeping when we do goal expansion */
if (!LOCAL_InterruptsDisabled && Yap_get_signal(YAP_CREEP_SIGNAL)) {
CalculateStackGap(PASS_REGS1);
}
return CallMetaCall(ARG1, mod PASS_REGS);
} else if (Yap_has_a_signal() && !LOCAL_InterruptsDisabled &&
!(LOCAL_PrologMode & (AbortMode | InterruptMode | SystemMode))) {
return EnterCreepMode(t, mod PASS_REGS);
}
restart_exec:
if (IsVarTerm(t)) {
return CallError(INSTANTIATION_ERROR, t0, mod PASS_REGS);
} else if (IsApplTerm(t)) {
register Functor f = FunctorOfTerm(t);
register CELL *pt;
PredEntry *pen;
unsigned int i, arity;
f = FunctorOfTerm(t);
if (IsExtensionFunctor(f)) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
arity = ArityOfFunctor(f);
if (arity > MaxTemps) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
pen = RepPredProp(PredPropByFunc(f, mod));
/* You thought we would be over by now */
/* but no meta calls require special preprocessing */
if (pen->PredFlags & (GoalExPredFlag | MetaPredFlag)) {
if (f == FunctorModule) {
Term tmod = ArgOfTerm(1, t);
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
mod = tmod;
t = ArgOfTerm(2, t);
goto restart_exec;
} else {
if (IsVarTerm(tmod)) {
return CallError(INSTANTIATION_ERROR, t0, mod PASS_REGS);
} else {
return CallError(TYPE_ERROR_ATOM, t0, mod PASS_REGS);
}
}
} else {
return CallMetaCall(t, mod PASS_REGS);
}
}
/* now let us do what we wanted to do from the beginning !! */
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
pt = RepAppl(t) + 1;
for (i = 1; i <= arity; i++) {
#if YAPOR_SBA
Term d0 = *pt++;
if (d0 == 0)
` XREGS[i] = (CELL)(pt - 1);
else
XREGS[i] = d0;
#else
XREGS[i] = *pt++;
#endif
}
return (CallPredicate(pen, B, pen->CodeOfPred PASS_REGS));
} else if (IsAtomTerm(t)) {
PredEntry *pe;
Atom a = AtomOfTerm(t);
if (a == AtomTrue || a == AtomOtherwise || a == AtomCut)
return (TRUE);
else if (a == AtomFail ||
(a == AtomFalse &&
!RepPredProp(PredPropByAtom(a, mod))->ModuleOfPred))
return (FALSE);
/* call may not define new system predicates!! */
pe = RepPredProp(PredPropByAtom(a, mod));
return (CallPredicate(pe, B, pe->CodeOfPred PASS_REGS));
} else if (IsIntTerm(t)) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
} else {
/* Is Pair Term */
return (CallMetaCall(t, mod PASS_REGS));
}
}
static Term copy_execn_to_heap(Functor f, CELL *pt, unsigned int n,
unsigned int arity, Term mod USES_REGS) {
CELL *h0 = HR;
Term tf;
unsigned int i;
if (arity == 2 && NameOfFunctor(f) == AtomDot) {
for (i = 0; i < arity - n; i++) {
*HR++ = pt[i];
}
for (i = 0; i < n; i++) {
*HR++ = h0[(int)(i - n)];
}
tf = AbsPair(h0);
} else {
*HR++ = (CELL)f;
for (i = 0; i < arity - n; i++) {
*HR++ = pt[i];
}
for (i = 0; i < n; i++) {
*HR++ = h0[(int)(i - n)];
}
tf = AbsAppl(h0);
}
if (mod != CurrentModule) {
CELL *h0 = HR;
*HR++ = (CELL)FunctorModule;
*HR++ = mod;
*HR++ = tf;
tf = AbsAppl(h0);
}
return tf;
}
inline static Int do_execute_n(Term t, Term mod, unsigned int n USES_REGS) {
Functor f;
Atom Name;
register CELL *pt;
PredEntry *pen;
unsigned int i, arity;
int j = -n;
Term t0 = t;
restart_exec:
if (IsVarTerm(t)) {
return CallError(INSTANTIATION_ERROR, t0, mod PASS_REGS);
} else if (IsAtomTerm(t)) {
arity = n;
Name = AtomOfTerm(t);
pt = NULL;
} else if (IsIntTerm(t)) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
} else if (IsPairTerm(t)) {
arity = n + 2;
pt = RepPair(t);
Name = AtomOfTerm(TermNil);
} else /* if (IsApplTerm(t)) */ {
f = FunctorOfTerm(t);
while (f == FunctorModule) {
Term tmod = ArgOfTerm(1, t);
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
mod = tmod;
t = ArgOfTerm(2, t);
goto restart_exec;
} else {
if (IsVarTerm(tmod)) {
return CallError(INSTANTIATION_ERROR, t0, tmod PASS_REGS);
} else {
return CallError(TYPE_ERROR_ATOM, t0, tmod PASS_REGS);
}
}
}
arity = ArityOfFunctor(f) + n;
Name = NameOfFunctor(f);
pt = RepAppl(t) + 1;
}
f = Yap_MkFunctor(Name, arity);
if (IsExtensionFunctor(f)) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
if (PRED_GOAL_EXPANSION_ALL) {
/* disable creeping when we do goal expansion */
if (Yap_get_signal(YAP_CREEP_SIGNAL) && !LOCAL_InterruptsDisabled) {
CalculateStackGap(PASS_REGS1);
}
t = copy_execn_to_heap(f, pt, n, arity, mod PASS_REGS);
return CallMetaCall(t, mod PASS_REGS);
} else if (Yap_has_a_signal() && !LOCAL_InterruptsDisabled) {
return EnterCreepMode(
copy_execn_to_heap(f, pt, n, arity, CurrentModule PASS_REGS),
mod PASS_REGS);
}
if (arity > MaxTemps) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
pen = RepPredProp(PredPropByFunc(f, mod));
/* You thought we would be over by now */
/* but no meta calls require special preprocessing */
if (pen->PredFlags & (GoalExPredFlag | MetaPredFlag)) {
Term t = copy_execn_to_heap(f, pt, n, arity, mod PASS_REGS);
return (CallMetaCall(t, mod PASS_REGS));
}
/* now let us do what we wanted to do from the beginning !! */
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
for (i = 1; i <= arity - n; i++) {
#if YAPOR_SBA
Term d0 = *pt++;
if (d0 == 0)
XREGS[i] = (CELL)(pt - 1);
else
XREGS[i] = d0;
#else
XREGS[i] = *pt++;
#endif
}
for (i = arity - n + 1; i <= arity; i++, j++) {
XREGS[i] = HR[j];
}
return CallPredicate(pen, B, pen->CodeOfPred PASS_REGS);
}
// enter locked
static Int EnterCreepMode(Term t, Term mod USES_REGS) {
PredEntry *PredCreep;
if (Yap_get_signal(YAP_CDOVF_SIGNAL)) {
ARG1 = t;
if (!Yap_locked_growheap(FALSE, 0, NULL)) {
Yap_Error(RESOURCE_ERROR_HEAP, TermNil,
"YAP failed to grow heap at meta-call");
}
if (!Yap_has_a_signal()) {
return do_execute(ARG1, mod PASS_REGS);
}
}
PredCreep = RepPredProp(PredPropByFunc(FunctorCreep, 1));
PP = PredCreep;
if (!IsVarTerm(t) && IsApplTerm(t) && FunctorOfTerm(t) == FunctorModule) {
ARG1 = MkPairTerm(ArgOfTerm(1, t), ArgOfTerm(2, t));
} else {
if (mod) {
ARG1 = MkPairTerm(mod, t);
} else {
ARG1 = MkPairTerm(TermProlog, t);
}
}
CalculateStackGap(PASS_REGS1);
P_before_spy = P;
return CallPredicate(PredCreep, B, PredCreep->CodeOfPred PASS_REGS);
}
static Int execute(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
return do_execute(t, CurrentModule PASS_REGS);
}
bool
Yap_Execute( Term t USES_REGS )
{ /* '$execute'(Goal) */
return do_execute(t, CurrentModule PASS_REGS);
}
static void heap_store(Term t USES_REGS) {
if (IsVarTerm(t)) {
if (VarOfTerm(t) < HR) {
*HR++ = t;
} else {
RESET_VARIABLE(HR);
Bind_Local(VarOfTerm(t), (CELL)HR);
HR++;
}
} else {
*HR++ = t;
}
}
static Int execute2(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
return do_execute_n(t, CurrentModule, 1 PASS_REGS);
}
static Int execute3(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
return do_execute_n(t, CurrentModule, 2 PASS_REGS);
}
static Int execute4(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
return do_execute_n(t, CurrentModule, 3 PASS_REGS);
}
static Int execute5(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
return do_execute_n(t, CurrentModule, 4 PASS_REGS);
}
static Int execute6(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
return do_execute_n(t, CurrentModule, 5 PASS_REGS);
}
static Int execute7(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
heap_store(Deref(ARG7) PASS_REGS);
return do_execute_n(t, CurrentModule, 6 PASS_REGS);
}
static Int execute8(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
heap_store(Deref(ARG7) PASS_REGS);
heap_store(Deref(ARG8) PASS_REGS);
return do_execute_n(t, CurrentModule, 7 PASS_REGS);
}
static Int execute9(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
heap_store(Deref(ARG7) PASS_REGS);
heap_store(Deref(ARG8) PASS_REGS);
heap_store(Deref(ARG9) PASS_REGS);
return do_execute_n(t, CurrentModule, 8 PASS_REGS);
}
static Int execute10(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
heap_store(Deref(ARG7) PASS_REGS);
heap_store(Deref(ARG8) PASS_REGS);
heap_store(Deref(ARG9) PASS_REGS);
heap_store(Deref(ARG10) PASS_REGS);
return (do_execute_n(t, CurrentModule, 9 PASS_REGS));
}
static Int execute11(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
heap_store(Deref(ARG7) PASS_REGS);
heap_store(Deref(ARG8) PASS_REGS);
heap_store(Deref(ARG9) PASS_REGS);
heap_store(Deref(ARG10) PASS_REGS);
heap_store(Deref(ARG11) PASS_REGS);
return (do_execute_n(t, CurrentModule, 10 PASS_REGS));
}
static Int execute12(USES_REGS1) { /* '$execute'(Goal) */
Term t = Deref(ARG1);
heap_store(Deref(ARG2) PASS_REGS);
heap_store(Deref(ARG3) PASS_REGS);
heap_store(Deref(ARG4) PASS_REGS);
heap_store(Deref(ARG5) PASS_REGS);
heap_store(Deref(ARG6) PASS_REGS);
heap_store(Deref(ARG7) PASS_REGS);
heap_store(Deref(ARG8) PASS_REGS);
heap_store(Deref(ARG9) PASS_REGS);
heap_store(Deref(ARG10) PASS_REGS);
heap_store(Deref(ARG11) PASS_REGS);
heap_store(Deref(ARG12) PASS_REGS);
return (do_execute_n(t, CurrentModule, 11 PASS_REGS));
}
static Int execute_clause(USES_REGS1) { /* '$execute_clause'(Goal) */
Term t = Deref(ARG1);
Term mod = Deref(ARG2);
choiceptr cut_cp = cp_from_integer(Deref(ARG4) PASS_REGS);
unsigned int arity;
Prop pe;
yamop *code;
Term clt = Deref(ARG3);
restart_exec:
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, ARG3, "call/1");
return FALSE;
} else if (IsAtomTerm(t)) {
Atom a = AtomOfTerm(t);
pe = PredPropByAtom(a, mod);
} else if (IsApplTerm(t)) {
register Functor f = FunctorOfTerm(t);
register unsigned int i;
register CELL *pt;
if (IsExtensionFunctor(f))
return (FALSE);
if (f == FunctorModule) {
Term tmod = ArgOfTerm(1, t);
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
mod = tmod;
t = ArgOfTerm(2, t);
goto restart_exec;
}
}
pe = PredPropByFunc(f, mod);
arity = ArityOfFunctor(f);
if (arity > MaxTemps) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
pt = RepAppl(t) + 1;
for (i = 1; i <= arity; ++i) {
#if YAPOR_SBA
Term d0 = *pt++;
if (d0 == 0)
XREGS[i] = (CELL)(pt - 1);
else
XREGS[i] = d0;
#else
XREGS[i] = *pt++;
#endif
}
} else {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
/* N = arity; */
/* call may not define new system predicates!! */
if (RepPredProp(pe)->PredFlags & MegaClausePredFlag) {
code = Yap_MegaClauseFromTerm(clt);
} else {
code = Yap_ClauseFromTerm(clt)->ClCode;
}
if (Yap_get_signal(YAP_CREEP_SIGNAL)) {
Yap_signal(YAP_CREEP_SIGNAL);
}
return CallPredicate(RepPredProp(pe), cut_cp, code PASS_REGS);
}
static Int execute_in_mod(USES_REGS1) { /* '$execute'(Goal) */
return (do_execute(Deref(ARG1), Deref(ARG2) PASS_REGS));
}
static Int do_goal_expansion(USES_REGS1) {
Int creeping = Yap_get_signal(YAP_CREEP_SIGNAL);
Int out = FALSE;
PredEntry *pe;
Term cmod = Deref(ARG2);
ARG2 = ARG3;
/* CurMod:goal_expansion(A,B) */
if ((pe = RepPredProp(Yap_GetPredPropByFunc(FunctorGoalExpansion2, cmod))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL, false PASS_REGS)) {
out = TRUE;
ARG3 = ARG2;
goto complete;
}
/* system:goal_expansion(A,B) */
if ((pe = RepPredProp(
Yap_GetPredPropByFunc(FunctorGoalExpansion2, SYSTEM_MODULE))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL, false PASS_REGS)) {
out = TRUE;
ARG3 = ARG2;
goto complete;
}
ARG3 = ARG2;
ARG2 = cmod;
/* user:goal_expansion(A,CurMod,B) */
if ((pe = RepPredProp(
Yap_GetPredPropByFunc(FunctorGoalExpansion, USER_MODULE))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL PASS_REGS, false)) {
out = TRUE;
goto complete;
}
ARG2 = ARG3;
/* user:goal_expansion(A,B) */
if (cmod != USER_MODULE && /* we have tried this before */
(pe = RepPredProp(
Yap_GetPredPropByFunc(FunctorGoalExpansion2, USER_MODULE))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL PASS_REGS, false)) {
ARG3 = ARG2;
out = TRUE;
}
complete:
if (creeping) {
Yap_signal(YAP_CREEP_SIGNAL);
}
return out;
}
static Int do_term_expansion(USES_REGS1) {
Int creeping = Yap_get_signal(YAP_CREEP_SIGNAL);
Int out = FALSE;
PredEntry *pe;
Term cmod = CurrentModule;
/* CurMod:term_expansion(A,B) */
if ((pe = RepPredProp(Yap_GetPredPropByFunc(FunctorTermExpansion, cmod))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL, false PASS_REGS)) {
out = TRUE;
goto complete;
}
/* system:term_expansion(A,B) */
if ((pe = RepPredProp(
Yap_GetPredPropByFunc(FunctorTermExpansion, SYSTEM_MODULE))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL, false PASS_REGS)) {
out = TRUE;
goto complete;
}
/* user:term_expansion(A,B) */
if (cmod != USER_MODULE && /* we have tried this before */
(pe = RepPredProp(
Yap_GetPredPropByFunc(FunctorTermExpansion, USER_MODULE))) &&
pe->OpcodeOfPred != FAIL_OPCODE && pe->OpcodeOfPred != UNDEF_OPCODE &&
Yap_execute_pred(pe, NULL, false PASS_REGS)) {
out = TRUE;
}
complete:
if (creeping) {
Yap_signal(YAP_CREEP_SIGNAL);
}
return out;
}
static Int execute0(USES_REGS1) { /* '$execute0'(Goal,Mod) */
Term t = Deref(ARG1), t0 = t;
Term mod = Deref(ARG2);
unsigned int arity;
Prop pe;
if (Yap_has_a_signal() && !LOCAL_InterruptsDisabled) {
return EnterCreepMode(t, mod PASS_REGS);
}
restart_exec:
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, ARG3, "call/1");
return FALSE;
} else if (IsAtomTerm(t)) {
Atom a = AtomOfTerm(t);
pe = PredPropByAtom(a, mod);
} else if (IsApplTerm(t)) {
register Functor f = FunctorOfTerm(t);
register unsigned int i;
register CELL *pt;
if (IsExtensionFunctor(f))
return FALSE;
if (f == FunctorModule) {
Term tmod = ArgOfTerm(1, t);
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
mod = tmod;
t = ArgOfTerm(2, t);
goto restart_exec;
} else {
if (IsVarTerm(tmod)) {
return CallError(INSTANTIATION_ERROR, t0, mod PASS_REGS);
} else {
return CallError(TYPE_ERROR_ATOM, t0, mod PASS_REGS);
}
}
}
pe = PredPropByFunc(f, mod);
// Yap_DebugPlWrite(mod);fprintf(stderr,"\n");
arity = ArityOfFunctor(f);
if (arity > MaxTemps) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
pt = RepAppl(t) + 1;
for (i = 1; i <= arity; ++i) {
#if YAPOR_SBA
Term d0 = *pt++;
if (d0 == 0)
XREGS[i] = (CELL)(pt - 1);
else
XREGS[i] = d0;
#else
XREGS[i] = *pt++;
#endif
}
} else {
Yap_Error(TYPE_ERROR_CALLABLE, t, "call/1");
return FALSE;
}
/* N = arity; */
/* call may not define new system predicates!! */
return CallPredicate(RepPredProp(pe), B,
RepPredProp(pe)->CodeOfPred PASS_REGS);
}
static Int execute_nonstop(USES_REGS1) { /* '$execute_nonstop'(Goal,Mod)
*/
Term t = Deref(ARG1), t0 = t;
Term mod = Deref(ARG2);
unsigned int arity;
Prop pe;
restart_exec:
if (IsVarTerm(mod)) {
mod = CurrentModule;
} else if (!IsAtomTerm(mod)) {
Yap_Error(TYPE_ERROR_ATOM, ARG2, "call/1");
return FALSE;
}
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, ARG1, "call/1");
return FALSE;
} else if (IsAtomTerm(t)) {
Atom a = AtomOfTerm(t);
pe = PredPropByAtom(a, mod);
} else if (IsApplTerm(t)) {
register Functor f = FunctorOfTerm(t);
register unsigned int i;
register CELL *pt;
if (IsExtensionFunctor(f))
return (FALSE);
if (f == FunctorModule) {
Term tmod = ArgOfTerm(1, t);
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
mod = tmod;
t = ArgOfTerm(2, t);
goto restart_exec;
} else {
if (IsVarTerm(tmod)) {
return CallError(INSTANTIATION_ERROR, t0, mod PASS_REGS);
} else {
return CallError(TYPE_ERROR_ATOM, t, mod PASS_REGS);
}
}
}
pe = PredPropByFunc(f, mod);
arity = ArityOfFunctor(f);
if (arity > MaxTemps) {
return CallError(TYPE_ERROR_CALLABLE, t, mod PASS_REGS);
}
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
pt = RepAppl(t) + 1;
for (i = 1; i <= arity; ++i) {
#if YAPOR_SBA
Term d0 = *pt++;
if (d0 == 0)
XREGS[i] = (CELL)(pt - 1);
else
XREGS[i] = d0;
#else
XREGS[i] = *pt++;
#endif
}
} else {
Yap_Error(TYPE_ERROR_CALLABLE, t, "call/1");
return FALSE;
}
/* N = arity; */
/* call may not define new system predicates!! */
if (RepPredProp(pe)->PredFlags & SpiedPredFlag) {
if (!LOCAL_InterruptsDisabled && Yap_get_signal(YAP_CREEP_SIGNAL)) {
Yap_signal(YAP_CREEP_SIGNAL);
}
#if defined(YAPOR) || defined(THREADS)
if (RepPredProp(pe)->PredFlags & LogUpdatePredFlag) {
PP = RepPredProp(pe);
PELOCK(80, PP);
}
#endif
return CallPredicate(RepPredProp(pe), B,
RepPredProp(pe)->cs.p_code.TrueCodeOfPred PASS_REGS);
} else {
if (Yap_get_signal(YAP_CREEP_SIGNAL) && !LOCAL_InterruptsDisabled &&
(!(RepPredProp(pe)->PredFlags & (AsmPredFlag | CPredFlag)) ||
RepPredProp(pe)->OpcodeOfPred == Yap_opcode(_call_bfunc_xx))) {
Yap_signal(YAP_CREEP_SIGNAL);
}
return CallPredicate(RepPredProp(pe), B,
RepPredProp(pe)->CodeOfPred PASS_REGS);
}
}
static Term slice_module_for_call_with_args(Term tin, Term *modp, int arity) {
if (IsVarTerm(tin)) {
Yap_Error(INSTANTIATION_ERROR, tin, "call_with_args/%d", arity);
return 0L;
}
while (IsApplTerm(tin)) {
Functor f = FunctorOfTerm(tin);
Term newmod;
if (f != FunctorModule) {
Yap_Error(TYPE_ERROR_ATOM, tin, "call_with_args/%d", arity);
return 0L;
}
newmod = ArgOfTerm(1, tin);
if (IsVarTerm(newmod)) {
Yap_Error(INSTANTIATION_ERROR, tin, "call_with_args/%d", arity);
return 0L;
} else if (!IsAtomTerm(newmod)) {
Yap_Error(TYPE_ERROR_ATOM, newmod, "call_with_args/%d", arity);
return 0L;
}
*modp = newmod;
tin = ArgOfTerm(2, tin);
}
if (!IsAtomTerm(tin)) {
Yap_Error(TYPE_ERROR_ATOM, tin, "call_with_args/%d", arity);
return 0L;
}
return tin;
}
static Int execute_0(USES_REGS1) { /* '$execute_0'(Goal) */
Term mod = CurrentModule;
Term t = slice_module_for_call_with_args(Deref(ARG1), &mod, 0);
if (!t)
return FALSE;
return do_execute(t, mod PASS_REGS);
}
static Int call_with_args(int i USES_REGS) {
Term mod = CurrentModule, t;
int j;
t = slice_module_for_call_with_args(Deref(ARG1), &mod, i);
if (!t)
return FALSE;
for (j = 0; j < i; j++)
heap_store(Deref(XREGS[j + 2]) PASS_REGS);
return (do_execute_n(t, mod, i PASS_REGS));
}
static Int execute_1(USES_REGS1) { /* '$execute_0'(Goal) */
return call_with_args(1 PASS_REGS);
}
static Int execute_2(USES_REGS1) { /* '$execute_2'(Goal) */
return call_with_args(2 PASS_REGS);
}
static Int execute_3(USES_REGS1) { /* '$execute_3'(Goal) */
return call_with_args(3 PASS_REGS);
}
static Int execute_4(USES_REGS1) { /* '$execute_4'(Goal) */
return call_with_args(4 PASS_REGS);
}
static Int execute_5(USES_REGS1) { /* '$execute_5'(Goal) */
return call_with_args(5 PASS_REGS);
}
static Int execute_6(USES_REGS1) { /* '$execute_6'(Goal) */
return call_with_args(6 PASS_REGS);
}
static Int execute_7(USES_REGS1) { /* '$execute_7'(Goal) */
return call_with_args(7 PASS_REGS);
}
static Int execute_8(USES_REGS1) { /* '$execute_8'(Goal) */
return call_with_args(8 PASS_REGS);
}
static Int execute_9(USES_REGS1) { /* '$execute_9'(Goal) */
return call_with_args(9 PASS_REGS);
}
static Int execute_10(USES_REGS1) { /* '$execute_10'(Goal) */
return call_with_args(10 PASS_REGS);
}
#ifdef DEPTH_LIMIT
static Int execute_depth_limit(USES_REGS1) {
Term d = Deref(ARG2);
if (IsVarTerm(d)) {
Yap_Error(INSTANTIATION_ERROR, d, "depth_bound_call/2");
return FALSE;
} else if (!IsIntegerTerm(d)) {
if (IsFloatTerm(d) && isinf(FloatOfTerm(d))) {
DEPTH = RESET_DEPTH();
} else {
Yap_Error(TYPE_ERROR_INTEGER, d, "depth_bound_call/2");
return FALSE;
}
} else {
DEPTH = MkIntTerm(IntegerOfTerm(d) * 2);
}
return execute(PASS_REGS1);
}
#endif
static Int pred_goal_expansion_on(USES_REGS1) {
/* a goal needs expansion if we have goal_expansion defined or
if the goal is a meta-call */
return PRED_GOAL_EXPANSION_ON;
}
static Int exec_absmi(bool top, yap_reset_t reset_mode USES_REGS) {
int lval, out;
if (top && (lval = sigsetjmp(LOCAL_RestartEnv, 1)) != 0) {
switch (lval) {
case 1: { /* restart */
/* otherwise, SetDBForThrow will fail entering critical mode */
LOCAL_PrologMode = UserMode;
/* find out where to cut to */
/* siglongjmp resets the TR hardware register */
/* TR and B are crucial, they might have been changed, or not */
restore_TR();
restore_B();
/* H is not so important, because we're gonna backtrack */
restore_H();
/* set stack */
ASP = (CELL *)PROTECT_FROZEN_B(B);
/* forget any signals active, we're reborne */
LOCAL_Signals = 0;
CalculateStackGap(PASS_REGS1);
LOCAL_PrologMode = UserMode;
P = (yamop *)FAILCODE;
} break;
case 2: {
/* arithmetic exception */
/* must be done here, otherwise siglongjmp will clobber all the registers
*/
Yap_Error(LOCAL_matherror, TermNil, NULL);
/* reset the registers so that we don't have trash in abstract machine */
Yap_set_fpu_exceptions(
getAtomicGlobalPrologFlag(ARITHMETIC_EXCEPTIONS_FLAG));
P = (yamop *)FAILCODE;
LOCAL_PrologMode = UserMode;
} break;
case 3: { /* saved state */
return FALSE;
}
default:
/* do nothing */
LOCAL_PrologMode = UserMode;
}
} else {
LOCAL_PrologMode = UserMode;
}
YENV = ASP;
YENV[E_CB] = Unsigned(B);
out = Yap_absmi(0);
/* make sure we don't leave a FAIL signal hanging around */
Yap_get_signal(YAP_FAIL_SIGNAL);
if (!Yap_has_a_signal())
CalculateStackGap(PASS_REGS1);
return out;
}
void Yap_PrepGoal(UInt arity, CELL *pt, choiceptr saved_b USES_REGS) {
/* create an initial pseudo environment so that when garbage
collection is going up in the environment chain it doesn't get
confused */
EX = NULL;
// sl = Yap_InitSlot(t);
YENV = ASP;
YENV[E_CP] = (CELL)YESCODE;
YENV[E_CB] = (CELL)B;
YENV[E_E] = (CELL)ENV;
#ifdef TABLING
YENV[E_B] = (CELL)B;
#endif
#ifdef DEPTH_LIMIT
YENV[E_DEPTH] = DEPTH;
#endif
ENV = YENV;
ASP -= EnvSizeInCells;
/* and now create a pseudo choicepoint for much the same reasons */
/* CP = YESCODE; */
/* keep a place where you can inform you had an exception */
if (pt) {
int i;
for (i = 0; i < arity; i++) {
XREGS[i + 1] = *pt++;
}
}
B = (choiceptr)ASP;
B--;
B->cp_h = HR;
B->cp_tr = TR;
B->cp_cp = CP;
B->cp_ap = NOCODE;
B->cp_env = ENV;
B->cp_b = saved_b;
#ifdef DEPTH_LIMIT
B->cp_depth = DEPTH;
#endif /* DEPTH_LIMIT */
YENV = ASP = (CELL *)B;
YENV[E_CB] = (CELL)B;
HB = HR;
CP = YESCODE;
}
static Int do_goal(yamop *CodeAdr, int arity, CELL *pt, bool top USES_REGS) {
choiceptr saved_b = B;
Int out;
Yap_PrepGoal(arity, pt, saved_b PASS_REGS);
P = (yamop *)CodeAdr;
S = CellPtr(RepPredProp(
PredPropByFunc(Yap_MkFunctor(AtomCall, 1), 0))); /* A1 mishaps */
out = exec_absmi(top, YAP_EXEC_ABSMI PASS_REGS);
Yap_flush();
// if (out) {
// out = Yap_GetFromSlot(sl);
// }
// Yap_RecoverSlots(1);
return out;
}
Int Yap_exec_absmi(bool top, yap_reset_t has_reset) {
CACHE_REGS
return exec_absmi(top, has_reset PASS_REGS);
}
void Yap_fail_all(choiceptr bb USES_REGS) {
yamop *saved_p, *saved_cp;
saved_p = P;
saved_cp = CP;
/* prune away choicepoints */
while (B && B->cp_b != bb) {
B = B->cp_b;
#ifdef YAPOR
CUT_prune_to(B);
#endif
}
P = FAILCODE;
Yap_exec_absmi(true, YAP_EXEC_ABSMI);
/* recover stack space */
HR = B->cp_h;
TR = B->cp_tr;
#ifdef DEPTH_LIMIT
DEPTH = B->cp_depth;
#endif /* DEPTH_LIMIT */
YENV = ENV = B->cp_env;
/* recover local stack */
#ifdef DEPTH_LIMIT
DEPTH = ENV[E_DEPTH];
#endif
/* make sure we prune C-choicepoints */
if (POP_CHOICE_POINT(B->cp_b)) {
POP_EXECUTE();
}
ENV = (CELL *)(ENV[E_E]);
/* ASP should be set to the top of the local stack when we
did the call */
ASP = B->cp_env;
/* YENV should be set to the current environment */
YENV = ENV = (CELL *)((B->cp_env)[E_E]);
B = B->cp_b;
// SET_BB(B);
HB = PROTECT_FROZEN_H(B);
CP = saved_cp;
P = saved_p;
}
int Yap_execute_pred(PredEntry *ppe, CELL *pt, bool pass_ex USES_REGS) {
yamop *saved_p, *saved_cp;
yamop *CodeAdr;
Int out;
saved_p = P;
saved_cp = CP;
PELOCK(81, ppe);
CodeAdr = ppe->CodeOfPred;
UNLOCK(ppe->PELock);
out = do_goal(CodeAdr, ppe->ArityOfPE, pt, false PASS_REGS);
if (out == 1) {
choiceptr cut_B;
/* we succeeded, let's prune */
/* restore the old environment */
/* get to previous environment */
cut_B = (choiceptr)ENV[E_CB];
{
/* Note that
cut_B == (choiceptr)ENV[E_CB] */
while (POP_CHOICE_POINT(ENV[E_CB])) {
POP_EXECUTE();
}
}
#ifdef YAPOR
CUT_prune_to(cut_B);
#endif /* YAPOR */
#ifdef TABLING
if (B != cut_B) {
while (B->cp_b < cut_B) {
B = B->cp_b;
}
#ifdef TABLING
abolish_incomplete_subgoals(B);
#endif
}
#endif /* TABLING */
B = cut_B;
CP = saved_cp;
P = saved_p;
ASP = ENV;
#ifdef DEPTH_LIMIT
DEPTH = ENV[E_DEPTH];
#endif
ENV = (CELL *)(ENV[E_E]);
/* we have failed, and usually we would backtrack to this B,
trouble is, we may also have a delayed cut to do */
if (B != NULL)
HB = B->cp_h;
YENV = ENV;
// should we catch the exception or pass it through?
// We'll pass it through
if (EX && pass_ex) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return FALSE;
}
return TRUE;
} else if (out == 0) {
P = saved_p;
CP = saved_cp;
HR = B->cp_h;
#ifdef DEPTH_LIMIT
DEPTH = B->cp_depth;
#endif
/* ASP should be set to the top of the local stack when we
did the call */
ASP = B->cp_env;
/* YENV should be set to the current environment */
YENV = ENV = (CELL *)((B->cp_env)[E_E]);
B = B->cp_b;
SET_BB(B);
HB = PROTECT_FROZEN_H(B);
// should we catch the exception or pass it through?
// We'll pass it through
if (EX && pass_ex) {
Term ball = Yap_PopTermFromDB(EX);
EX = NULL;
Yap_JumpToEnv(ball);
return FALSE;
}
return (FALSE);
} else {
Yap_Error(SYSTEM_ERROR_INTERNAL, TermNil, "emulator crashed");
return (FALSE);
}
}
Int Yap_execute_goal(Term t, int nargs, Term mod, bool pass_ex) {
CACHE_REGS
Prop pe;
PredEntry *ppe;
CELL *pt;
/* preserve the current restart environment */
/* visualc*/
/* just keep the difference because of possible garbage collections */
if (IsAtomTerm(t)) {
Atom a = AtomOfTerm(t);
pt = NULL;
pe = PredPropByAtom(a, mod);
} else if (IsApplTerm(t)) {
Functor f = FunctorOfTerm(t);
if (IsBlobFunctor(f)) {
Yap_Error(TYPE_ERROR_CALLABLE, t, "call/1");
return (FALSE);
}
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
pt = RepAppl(t) + 1;
pe = PredPropByFunc(f, mod);
} else {
Yap_Error(TYPE_ERROR_CALLABLE, t, "call/1");
return (FALSE);
}
ppe = RepPredProp(pe);
if (pe == NIL) {
return CallMetaCall(t, mod PASS_REGS);
}
return Yap_execute_pred(ppe, pt, pass_ex PASS_REGS);
}
void Yap_trust_last(void) {
CACHE_REGS
ASP = B->cp_env;
CP = B->cp_cp;
HR = B->cp_h;
#ifdef DEPTH_LIMIT
DEPTH = B->cp_depth;
#endif
YENV = ASP = B->cp_env;
ENV = (CELL *)((B->cp_env)[E_E]);
B = B->cp_b;
P = (yamop *)(ENV[E_CP]);
if (B) {
SET_BB(B);
HB = PROTECT_FROZEN_H(B);
}
}
Term Yap_RunTopGoal(Term t) {
CACHE_REGS
yamop *CodeAdr;
Prop pe;
PredEntry *ppe;
CELL *pt;
UInt arity;
Term mod = CurrentModule;
Term goal_out = 0;
restart_runtopgoal:
if (IsAtomTerm(t)) {
Atom a = AtomOfTerm(t);
pt = NULL;
pe = PredPropByAtom(a, CurrentModule);
arity = 0;
} else if (IsApplTerm(t)) {
Functor f = FunctorOfTerm(t);
if (IsBlobFunctor(f)) {
Yap_Error(TYPE_ERROR_CALLABLE, t, "call/1");
return (FALSE);
}
if (f == FunctorModule) {
Term tmod = ArgOfTerm(1, t);
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
mod = tmod;
t = ArgOfTerm(2, t);
goto restart_runtopgoal;
} else {
if (IsVarTerm(tmod)) {
Yap_Error(INSTANTIATION_ERROR, t, "call/1");
} else {
Yap_Error(TYPE_ERROR_ATOM, t, "call/1");
}
return FALSE;
}
}
/* I cannot use the standard macro here because
otherwise I would dereference the argument and
might skip a svar */
pe = PredPropByFunc(f, mod);
pt = RepAppl(t) + 1;
arity = ArityOfFunctor(f);
} else {
Yap_Error(TYPE_ERROR_CALLABLE, Yap_PredicateIndicator(t, mod), "call/1");
return (FALSE);
}
ppe = RepPredProp(pe);
if (pe == NIL) {
/* we must always start the emulator with Prolog code */
return FALSE;
}
PELOCK(82, ppe);
CodeAdr = ppe->CodeOfPred;
UNLOCK(ppe->PELock);
#if !USE_SYSTEM_MALLOC
if (LOCAL_TrailTop - HeapTop < 2048) {
LOCAL_PrologMode = BootMode;
Yap_Error(RESOURCE_ERROR_TRAIL, TermNil,
"unable to boot because of too little Trail space");
}
#endif
goal_out = do_goal(CodeAdr, arity, pt, true PASS_REGS);
return goal_out;
}
static void do_restore_regs(Term t, int restore_all USES_REGS) {
if (IsApplTerm(t)) {
Int i;
Int max = ArityOfFunctor(FunctorOfTerm(t)) - 4;
CELL *ptr = RepAppl(t) + 5;
P = (yamop *)IntegerOfTerm(ptr[-4]);
CP = (yamop *)IntegerOfTerm(ptr[-3]);
ENV = (CELL *)(LCL0 - IntegerOfTerm(ptr[-2]));
YENV = (CELL *)(LCL0 - IntegerOfTerm(ptr[-1]));
for (i = 0; i < max; i += 2) {
Int j = IntOfTerm(ptr[0]);
XREGS[j] = ptr[1];
ptr += 2;
}
}
}
/* low level voodoo to restore temporary registers after a call */
static Int restore_regs(USES_REGS1) {
Term t = Deref(ARG1);
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "support for coroutining");
return (FALSE);
}
if (IsAtomTerm(t))
return (TRUE);
do_restore_regs(t, FALSE PASS_REGS);
return (TRUE);
}
/* low level voodoo to cut and then restore temporary registers after a call */
static Int restore_regs2(USES_REGS1) {
Term t = Deref(ARG1), d0;
choiceptr pt0;
Int d;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "support for coroutining");
return (FALSE);
}
d0 = Deref(ARG2);
if (!IsAtomTerm(t)) {
do_restore_regs(t, TRUE PASS_REGS);
}
if (IsVarTerm(d0)) {
Yap_Error(INSTANTIATION_ERROR, d0, "support for coroutining");
return (FALSE);
}
if (!IsIntegerTerm(d0)) {
return (FALSE);
}
d = IntegerOfTerm(d0);
if (!d)
return TRUE;
#if YAPOR_SBA
pt0 = (choiceptr)d;
#else
pt0 = (choiceptr)(LCL0 - d);
#endif
/* find where to cut to */
if ((CELL *)pt0 != LCL0 && pt0 > B) {
/* Wow, we're gonna cut!!! */
while (B->cp_b < pt0) {
while (POP_CHOICE_POINT(B->cp_b)) {
POP_EXECUTE();
}
HB = B->cp_h;
Yap_TrimTrail();
B = B->cp_b;
}
#ifdef TABLING
abolish_incomplete_subgoals(B);
#endif
#ifdef YAPOR
CUT_prune_to(pt0);
#endif /* YAPOR */
B = pt0;
}
return (TRUE);
}
static Int clean_ifcp(USES_REGS1) {
Term t = Deref(ARG1);
choiceptr pt0;
if (IsVarTerm(t)) {
Yap_Error(INSTANTIATION_ERROR, t, "cut_at/1");
return FALSE;
}
if (!IsIntegerTerm(t)) {
Yap_Error(TYPE_ERROR_INTEGER, t, "cut_at/1");
return FALSE;
}
#if YAPOR_SBA
pt0 = (choiceptr)IntegerOfTerm(t);
#else
pt0 = cp_from_integer(t PASS_REGS);
#endif
if (pt0 < B) {
/* this should never happen */
return TRUE;
} else if (pt0 == B) {
while (POP_CHOICE_POINT(B->cp_b)) {
POP_EXECUTE();
}
B = B->cp_b;
HB = B->cp_h;
} else {
pt0->cp_ap = (yamop *)TRUSTFAILCODE;
}
return TRUE;
}
static int disj_marker(yamop *apc) {
op_numbers opnum = Yap_op_from_opcode(apc->opc);
return opnum == _or_else || opnum == _or_last;
}
static Int cut_up_to_next_disjunction(USES_REGS1) {
choiceptr pt0 = B;
CELL *qenv = (CELL *)ENV[E_E];
while (pt0 && !(qenv == pt0->cp_env && disj_marker(pt0->cp_ap))) {
pt0 = pt0->cp_b;
}
if (!pt0)
return TRUE;
#ifdef YAPOR
CUT_prune_to(pt0);
#endif /* YAPOR */
/* find where to cut to */
if (SHOULD_CUT_UP_TO(B, pt0)) {
B = pt0;
#ifdef TABLING
abolish_incomplete_subgoals(B);
#endif /* TABLING */
}
HB = B->cp_h;
Yap_TrimTrail();
return TRUE;
}
bool Yap_Reset(yap_reset_t mode) {
CACHE_REGS
int res = TRUE;
if (EX) {
LOCAL_BallTerm = EX;
}
EX = NULL;
Yap_ResetExceptionTerm(0);
LOCAL_UncaughtThrow = FALSE;
/* first, backtrack to the root */
while (B->cp_b) {
B = B->cp_b;
}
// B shoul lead to CP with _ystop0,,
P = FAILCODE;
res = Yap_exec_absmi(true, mode);
/* reinitialize the engine */
// Yap_InitYaamRegs( worker_id );
GLOBAL_Initialised = true;
ENV = LCL0;
ASP = (CELL *)B;
/* the first real choice-point will also have AP=FAIL */
/* always have an empty slots for people to use */
P = CP = YESCODE;
// ensure that we have slots where we need them
Yap_RebootSlots(worker_id);
return res;
}
bool is_cleanup_cp(choiceptr cp_b) {
PredEntry *pe;
if (cp_b->cp_ap->opc != ORLAST_OPCODE)
return FALSE;
#ifdef YAPOR
pe = cp_b->cp_ap->y_u.Osblp.p0;
#else
pe = cp_b->cp_ap->y_u.p.p;
#endif /* YAPOR */
/*
it has to be a cleanup and it has to be a completed goal,
otherwise the throw will be caught anyway.
*/
return pe == PredSafeCallCleanup;
}
static Int JumpToEnv(Term t USES_REGS) {
#ifndef YAPOR
yamop *pos = NEXTOP(PredDollarCatch->cs.p_code.TrueCodeOfPred, l),
*catchpos = NEXTOP(PredHandleThrow->cs.p_code.TrueCodeOfPred, l);
#else
yamop *pos = NEXTOP(PredDollarCatch->cs.p_code.TrueCodeOfPred, Otapl),
*catchpos = NEXTOP(PredHandleThrow->cs.p_code.TrueCodeOfPred, Otapl);
#endif
CELL *env, *env1;
choiceptr handler, previous = NULL;
/* throws cannot interrupt throws */
if (EX)
return FALSE;
/* just keep the throwed object away, we don't need to care about it */
if (!(LOCAL_BallTerm = Yap_StoreTermInDB(t, 0))) {
Yap_RestartYap(1);
}
/* careful, previous step may have caused a stack shift,
so get pointers here */
handler = B;
env1 = ENV;
do {
/* find the first choicepoint that may be a catch */
while (handler && handler->cp_ap != pos) {
/* we are already doing a catch */
if (handler->cp_ap == catchpos || handler->cp_ap == NOCODE) {
P = (yamop *)FAILCODE;
/* make sure failure will be seen at next port */
if (LOCAL_PrologMode & AsyncIntMode) {
Yap_signal(YAP_FAIL_SIGNAL);
}
HB = handler->cp_h;
B = handler;
return TRUE;
}
/* make sure we prune C-choicepoints */
while (POP_CHOICE_POINT(handler->cp_b)) {
POP_EXECUTE();
}
handler = handler->cp_b;
}
/* uncaught throw */
if (handler == NULL) {
LOCAL_UncaughtThrow = TRUE;
Yap_RestartYap(1);
}
/* is it a continuation? */
env = handler->cp_env;
while (env > env1) {
env1 = ENV_Parent(env1);
}
/* yes, we found it ! */
// while (env < ENV)
// env = ENV_Paren t(env);
if (env == env1) {
break;
}
/* oops, try next */
handler = handler->cp_b;
} while (TRUE);
/* step one environment above, otherwise we'll redo the original goal */
if (previous == NULL) {
B = handler;
} else {
// EX = t;
previous->cp_b = handler;
}
/* make sure we get rid of trash in the trail */
handler->cp_cp = (yamop *)env[E_CP];
handler->cp_env = (CELL *)env[E_E];
handler->cp_ap = catchpos;
/* can recover Heap thanks to copy term :-( */
/* B->cp_h = H; */
/* I could backtrack here, but it is easier to leave the unwinding
to the emulator */
if (LOCAL_PrologMode & AsyncIntMode) {
Yap_signal(YAP_FAIL_SIGNAL);
}
P = (yamop *)FAILCODE;
HB = B->cp_h;
/* try to recover space */
/* can only do that when we recover space */
/* first, simulate backtracking */
/* so that I will execute op_fail */
return TRUE;
}
Int Yap_JumpToEnv(Term t) {
CACHE_REGS
if (LOCAL_PrologMode & BootMode) {
return FALSE;
}
return JumpToEnv(t PASS_REGS);
}
/* This does very nasty stuff!!!!! */
static Int jump_env(USES_REGS1) { return (JumpToEnv(Deref(ARG1) PASS_REGS)); }
/* set up a meta-call based on . context info */
static Int generate_pred_info(USES_REGS1) {
ARG1 = ARG3 = ENV[-EnvSizeInCells - 1];
ARG4 = ENV[-EnvSizeInCells - 3];
ARG2 = cp_as_integer((choiceptr)ENV[E_CB] PASS_REGS);
return TRUE;
}
void Yap_InitYaamRegs(int myworker_id) {
Term h0var;
// getchar();
#if PUSH_REGS
/* Guarantee that after a longjmp we go back to the original abstract
machine registers */
#ifdef THREADS
if (myworker_id) {
REGSTORE *rs = REMOTE_ThreadHandle(myworker_id).default_yaam_regs;
pthread_setspecific(Yap_yaamregs_key, (const void *)rs);
REMOTE_ThreadHandle(myworker_id).current_yaam_regs = rs;
}
/* may be run by worker_id on behalf on myworker_id */
#else
Yap_regp = &Yap_standard_regs;
#endif
#endif /* PUSH_REGS */
CACHE_REGS
Yap_ResetExceptionTerm(myworker_id);
Yap_PutValue(AtomBreak, MkIntTerm(0));
TR = (tr_fr_ptr)REMOTE_TrailBase(myworker_id);
HR = H0 = ((CELL *)REMOTE_GlobalBase(myworker_id)) +
1; // +1: hack to ensure the gc does not try to mark mistakenly
LCL0 = ASP = (CELL *)REMOTE_LocalBase(myworker_id);
CurrentTrailTop = (tr_fr_ptr)(REMOTE_TrailTop(myworker_id) - MinTrailGap);
/* notice that an initial choice-point and environment
*must* be created for the garbage collector to work */
B = NULL;
ENV = NULL;
P = CP = YESCODE;
#ifdef DEPTH_LIMIT
DEPTH = RESET_DEPTH();
#endif
STATIC_PREDICATES_MARKED = FALSE;
if (REMOTE_GlobalArena(myworker_id) == 0L ||
REMOTE_GlobalArena(myworker_id) == TermNil) {
} else {
HR = RepAppl(REMOTE_GlobalArena(myworker_id));
}
REMOTE_GlobalArena(myworker_id) = TermNil;
Yap_AllocateDefaultArena(128 * 1024, 2, myworker_id);
Yap_InitPreAllocCodeSpace(myworker_id);
#ifdef FROZEN_STACKS
H_FZ = HR;
#ifdef YAPOR_SBA
BSEG =
#endif /* YAPOR_SBA */
BBREG = B_FZ = (choiceptr)REMOTE_LocalBase(myworker_id);
TR = TR_FZ = (tr_fr_ptr)REMOTE_TrailBase(myworker_id);
#endif /* FROZEN_STACKS */
CalculateStackGap(PASS_REGS1);
/* the first real choice-point will also have AP=FAIL */
/* always have an empty slots for people to use */
#if defined(YAPOR) || defined(THREADS)
LOCAL = REMOTE(myworker_id);
worker_id = myworker_id;
#endif /* THREADS */
#if COROUTINING
REMOTE_WokenGoals(myworker_id) = Yap_NewTimedVar(TermNil);
h0var = MkVarTerm();
REMOTE_AttsMutableList(myworker_id) = Yap_NewTimedVar(h0var);
#endif
Yap_RebootSlots(myworker_id);
h0var = MkVarTerm();
REMOTE_GcGeneration(myworker_id) = Yap_NewTimedVar(h0var);
REMOTE_GcCurrentPhase(myworker_id) = 0L;
REMOTE_GcPhase(myworker_id) =
Yap_NewTimedVar(MkIntTerm(REMOTE_GcCurrentPhase(myworker_id)));
#if defined(YAPOR) || defined(THREADS)
PP = NULL;
PREG_ADDR = NULL;
#endif
cut_c_initialize(myworker_id);
Yap_PrepGoal(0, NULL, NULL PASS_REGS);
#ifdef TABLING
/* ensure that LOCAL_top_dep_fr is always valid */
if (REMOTE_top_dep_fr(myworker_id))
DepFr_cons_cp(REMOTE_top_dep_fr(myworker_id)) = NORM_CP(B);
#endif
}
static Int uncaught_throw(USES_REGS1) {
Int out = LOCAL_UncaughtThrow;
LOCAL_UncaughtThrow = FALSE; /* just caught it */
return out;
}
Term Yap_GetException(void) {
CACHE_REGS
Term t = 0L;
if (LOCAL_BallTerm) {
do {
t = Yap_PopTermFromDB(LOCAL_BallTerm);
if (t == 0) {
if (LOCAL_Error_TYPE == RESOURCE_ERROR_ATTRIBUTED_VARIABLES) {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_growglobal(NULL)) {
Yap_Error(RESOURCE_ERROR_ATTRIBUTED_VARIABLES, TermNil,
LOCAL_ErrorMessage);
return FALSE;
}
} else {
LOCAL_Error_TYPE = YAP_NO_ERROR;
if (!Yap_growstack(LOCAL_BallTerm->NOfCells * CellSize)) {
Yap_Error(RESOURCE_ERROR_STACK, TermNil, LOCAL_ErrorMessage);
return FALSE;
}
}
}
} while (t == 0);
LOCAL_BallTerm = NULL;
}
return t;
}
static Int reset_exception(USES_REGS1) {
Term t;
EX = NULL;
t = Yap_GetException();
if (!t)
return FALSE;
return Yap_unify(t, ARG1);
}
void Yap_ResetExceptionTerm(int wid) {
Yap_ReleaseTermFromDB(REMOTE_BallTerm(wid));
REMOTE_BallTerm(wid) = NULL;
}
static Int get_exception(USES_REGS1) {
Term t = Yap_GetException();
if (!t)
return FALSE;
return Yap_unify(t, ARG1);
}
int Yap_dogc(int extra_args, Term *tp USES_REGS) {
UInt arity;
yamop *nextpc;
int i;
if (P && PREVOP(P, Osbpp)->opc == Yap_opcode(_call_usercpred)) {
arity = PREVOP(P, Osbpp)->y_u.Osbpp.p->ArityOfPE;
nextpc = P;
} else {
arity = 0;
nextpc = CP;
}
for (i = 0; i < extra_args; i++) {
XREGS[arity + i + 1] = tp[i];
}
if (!Yap_gc(arity + extra_args, ENV, nextpc)) {
return FALSE;
}
for (i = 0; i < extra_args; i++) {
tp[i] = XREGS[arity + i + 1];
}
return TRUE;
}
void Yap_InitExecFs(void) {
CACHE_REGS
Term cm = CurrentModule;
Yap_InitComma();
Yap_InitCPred("$execute", 1, execute, 0);
Yap_InitCPred("$execute", 2, execute2, 0);
Yap_InitCPred("$execute", 3, execute3, 0);
Yap_InitCPred("$execute", 4, execute4, 0);
Yap_InitCPred("$execute", 5, execute5, 0);
Yap_InitCPred("$execute", 6, execute6, 0);
Yap_InitCPred("$execute", 7, execute7, 0);
Yap_InitCPred("$execute", 8, execute8, 0);
Yap_InitCPred("$execute", 9, execute9, 0);
Yap_InitCPred("$execute", 10, execute10, 0);
Yap_InitCPred("$execute", 11, execute11, 0);
Yap_InitCPred("$execute", 12, execute12, 0);
Yap_InitCPred("$execute_in_mod", 2, execute_in_mod, 0);
Yap_InitCPred("$execute_wo_mod", 2, execute_in_mod, 0);
Yap_InitCPred("call_with_args", 1, execute_0, 0);
Yap_InitCPred("call_with_args", 2, execute_1, 0);
Yap_InitCPred("call_with_args", 3, execute_2, 0);
Yap_InitCPred("call_with_args", 4, execute_3, 0);
Yap_InitCPred("call_with_args", 5, execute_4, 0);
Yap_InitCPred("call_with_args", 6, execute_5, 0);
Yap_InitCPred("call_with_args", 7, execute_6, 0);
Yap_InitCPred("call_with_args", 8, execute_7, 0);
Yap_InitCPred("call_with_args", 9, execute_8, 0);
Yap_InitCPred("call_with_args", 10, execute_9, 0);
Yap_InitCPred("call_with_args", 11, execute_10, 0);
#ifdef DEPTH_LIMIT
Yap_InitCPred("$execute_under_depth_limit", 2, execute_depth_limit, 0);
#endif
Yap_InitCPred("$execute0", 2, execute0, NoTracePredFlag);
Yap_InitCPred("$execute_nonstop", 2, execute_nonstop, NoTracePredFlag);
Yap_InitCPred("$execute_clause", 4, execute_clause, NoTracePredFlag);
Yap_InitCPred("$current_choice_point", 1, current_choice_point, 0);
Yap_InitCPred("$current_choicepoint", 1, current_choice_point, 0);
CurrentModule = HACKS_MODULE;
Yap_InitCPred("current_choice_point", 1, current_choice_point, 0);
Yap_InitCPred("current_choicepoint", 1, current_choice_point, 0);
Yap_InitCPred("env_choice_point", 1, save_env_b, 0);
Yap_InitCPred("trail_suspension_marker", 1, trail_suspension_marker, 0);
Yap_InitCPred("cut_at", 1, clean_ifcp, SafePredFlag);
CurrentModule = cm;
Yap_InitCPred("$pred_goal_expansion_on", 0, pred_goal_expansion_on,
SafePredFlag);
Yap_InitCPred("$restore_regs", 1, restore_regs,
NoTracePredFlag | SafePredFlag);
Yap_InitCPred("$restore_regs", 2, restore_regs2,
NoTracePredFlag | SafePredFlag);
Yap_InitCPred("$clean_ifcp", 1, clean_ifcp, SafePredFlag);
Yap_InitCPred("qpack_clean_up_to_disjunction", 0, cut_up_to_next_disjunction,
SafePredFlag);
Yap_InitCPred("$jump_env_and_store_ball", 1, jump_env, 0);
Yap_InitCPred("$generate_pred_info", 4, generate_pred_info, 0);
Yap_InitCPred("$uncaught_throw", 0, uncaught_throw, 0);
Yap_InitCPred("$reset_exception", 1, reset_exception, 0);
Yap_InitCPred("$do_goal_expansion", 3, do_goal_expansion, 0);
Yap_InitCPred("$do_term_expansion", 2, do_term_expansion, 0);
Yap_InitCPred("$get_exception", 1, get_exception, 0);
}
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