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yap-6.3/C/meta_absmi_insts.h

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#ifdef INDENT_CODE
{
{
{
#endif /* INDENT_CODE */
/* join all the meta-call code into a single procedure with three entry points */
{
CACHE_Y_AS_ENV(YREG);
BEGD(d0); /* term to be meta-called */
Term mod; /* module to be used */
PredEntry *pen; /* predicate */
choiceptr b_ptr; /* cut point */
Functor f;
/* we are doing the rhs of a , */
BOp(p_execute_tail, Osbmp);
FETCH_Y_FROM_ENV(YREG);
/* place to cut to */
b_ptr = (choiceptr)ENV_YREG[E_CB];
/* original goal */
d0 = ENV_YREG[-EnvSizeInCells-1];
/* predicate we had used */
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pen = RepPredProp(AddressOfTerm(ENV_YREG[-EnvSizeInCells-2]));
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/* current module at the time */
mod = ENV_YREG[-EnvSizeInCells-3];
/* set YREG */
/* Try to preserve the environment */
ENV_YREG = (CELL *) (((char *) YREG) + PREG->y_u.Osbmp.s);
#ifdef FROZEN_STACKS
{
choiceptr top_b = PROTECT_FROZEN_B(B);
#ifdef YAPOR_SBA
if (ENV_YREG > (CELL *) top_b || ENV_YREG < HR) ENV_YREG = (CELL *) top_b;
#else
if (ENV_YREG > (CELL *) top_b) ENV_YREG = (CELL *) top_b;
#endif /* YAPOR_SBA */
}
#else
if (ENV_YREG > (CELL *) B) {
ENV_YREG = (CELL *) B;
}
#endif /* FROZEN_STACKS */
/* now, jump to actual execution */
if (pen->ArityOfPE) {
f = pen->FunctorOfPred;
/* reuse environment if we are continuining a comma, ie, (g1,g2,g3) */
/* can only do it deterministically */
/* broken
if (f == FunctorComma && (CELL *)B >= ENV) {
ENV_YREG = ENV;
ENV = (CELL *)ENV[E_E];
}
*/
goto execute_pred_f;
} else
goto execute_pred_a;
ENDBOp();
/* fetch the module from ARG2 */
BOp(p_execute2, Osbpp);
mod = ARG2;
deref_head(mod, execute2_unk0);
execute2_nvar0:
if (!IsAtomTerm(mod)) {
saveregs();
Yap_Error(TYPE_ERROR_ATOM, mod, "call/2");
setregs();
}
goto start_execute;
BEGP(pt1);
deref_body(mod, pt1, execute2_unk0, execute2_nvar0);
saveregs();
Yap_Error(INSTANTIATION_ERROR, mod, "call/2");
setregs();
ENDP(pt1);
/* Oops, second argument was unbound too */
FAIL();
ENDBOp();
BOp(p_execute, Osbmp);
/* fetch the module from PREG */
mod = PREG->y_u.Osbmp.mod;
start_execute:
/* place to cut to */
b_ptr = B;
/* we have mod, and ARG1 has the goal, let us roll */
/* Try to preserve the environment */
ENV_YREG = (CELL *) (((char *) YREG) + PREG->y_u.Osbmp.s);
#ifdef FROZEN_STACKS
{
choiceptr top_b = PROTECT_FROZEN_B(B);
#ifdef YAPOR_SBA
if (ENV_YREG > (CELL *) top_b || ENV_YREG < HR) ENV_YREG = (CELL *) top_b;
#else
if (ENV_YREG > (CELL *) top_b) ENV_YREG = (CELL *) top_b;
#endif /* YAPOR_SBA */
}
#else
if (ENV_YREG > (CELL *) B) {
ENV_YREG = (CELL *) B;
}
#endif /* FROZEN_STACKS */
d0 = ARG1;
restart_execute:
deref_head(d0, execute_unk);
execute_nvar:
if (IsApplTerm(d0)) {
f = FunctorOfTerm(d0);
if (IsExtensionFunctor(f)) {
goto execute_metacall;
}
pen = RepPredProp(PredPropByFunc(f, mod));
execute_pred_f:
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if (pen->PredFlags & (MetaPredFlag|UndefPredFlag)) {
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/* just strip all of M:G */
if (f == FunctorModule) {
Term tmod = ArgOfTerm(1,d0);
/* loop on modules */
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
d0 = ArgOfTerm(2,d0);
mod = tmod;
goto execute_nvar;
}
goto execute_metacall;
}
if (f == FunctorComma) {
Term nmod = mod;
/* optimise conj */
SREG = RepAppl(d0);
BEGD(d1);
d1 = SREG[2];
/* create an environment to execute the call */
deref_head(d1, execute_comma_unk);
execute_comma_nvar:
if (IsAtomTerm(d1)) {
/* atomic goal is simpler */
ENV_YREG[-EnvSizeInCells-2] = MkIntegerTerm((Int)PredPropByAtom(AtomOfTerm(d1),nmod));
} else if (IsApplTerm(d1)) {
Functor f1 = FunctorOfTerm(d1);
if (IsExtensionFunctor(f1)) {
goto execute_metacall;
} else {
/* check for modules when looking up */
if (f1 == FunctorModule) {
Term tmod = ArgOfTerm(1,d1);
/* loop on modules */
if (!IsVarTerm(tmod) && IsAtomTerm(tmod)) {
d1 = ArgOfTerm(2,d1);
nmod = tmod;
goto execute_comma_nvar;
}
goto execute_metacall;
}
ENV_YREG[-EnvSizeInCells-2] = MkIntegerTerm((Int)PredPropByFunc(f1,nmod));
}
} else {
goto execute_metacall;
}
ENV_YREG[-EnvSizeInCells-3] = mod;
/* now, we can create the new environment for the meta-call */
/* notice that we are at a call, so we should ignore CP */
ENV_YREG[E_CP] = (CELL)NEXTOP(PREG,Osbmp);
ENV_YREG[E_CB] = (CELL)b_ptr;
ENV_YREG[E_E] = (CELL)ENV;
#ifdef DEPTH_LIMIT
ENV_YREG[E_DEPTH] = DEPTH;
#endif /* DEPTH_LIMIT */
ENV_YREG[-EnvSizeInCells-1] = d1;
ENV = ENV_YREG;
ENV_YREG -= EnvSizeInCells+3;
CPREG = NEXTOP(PREG, Osbmp);
PREG = COMMA_CODE;
/* for profiler */
save_pc();
d0 = SREG[1];
goto restart_execute;
BEGP(pt1);
deref_body(d1, pt1, execute_comma_unk, execute_comma_nvar);
goto execute_metacall;
ENDP(pt1);
ENDD(d1);
} else if (mod != CurrentModule) {
goto execute_metacall;
}
}
/* copy arguments of meta-call to XREGS */
BEGP(pt1);
pt1 = RepAppl(d0);
BEGD(d2);
for (d2 = ArityOfFunctor(f); d2; d2--) {
#ifdef YAPOR_SBA
BEGD(d1);
d1 = pt1[d2];
if (d1 == 0) {
XREGS[d2] = (CELL)(pt1+d2);
} else {
XREGS[d2] = d1;
}
#else
XREGS[d2] = pt1[d2];
#endif
}
ENDD(d2);
ENDP(pt1);
CACHE_A1();
} else if (IsAtomTerm(d0)) {
pen = RepPredProp(PredPropByAtom(AtomOfTerm(d0), mod));
execute_pred_a:
/* handle extra pruning */
if (pen->FunctorOfPred == (Functor)AtomCut) {
if (b_ptr != B) {
saveregs();
prune(b_ptr PASS_REGS);
setregs();
}
}
} else {
goto execute_metacall;
}
/* execute, but test first for interrupts */
execute_end:
/* code copied from call */
#ifndef NO_CHECKING
check_stack(NoStackPExecute, HR);
#endif
execute_stack_checked:
CPREG = NEXTOP(PREG, Osbmp);
ALWAYS_LOOKAHEAD(pen->OpcodeOfPred);
PREG = pen->CodeOfPred;
/* for profiler */
save_pc();
#ifdef DEPTH_LIMIT
if (DEPTH <= MkIntTerm(1)) {/* I assume Module==0 is primitives */
if (pen->ModuleOfPred) {
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if (DEPTH == MkIntTerm(0)) {
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FAIL();
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} else {
DEPTH = RESET_DEPTH();
}
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}
} else if (pen->ModuleOfPred)
DEPTH -= MkIntConstant(2);
#endif /* DEPTH_LIMIT */
#ifdef LOW_LEVEL_TRACER
if (Yap_do_low_level_trace)
low_level_trace(enter_pred,pen,XREGS+1);
#endif /* LOW_LEVEL_TRACER */
WRITEBACK_Y_AS_ENV();
/* setup GB */
ENV_YREG[E_CB] = (CELL) B;
#ifdef YAPOR
SCH_check_requests();
#endif /* YAPOR */
CACHE_A1();
ALWAYS_GONext();
ALWAYS_END_PREFETCH();
/* meta-call: Prolog to the rescue */
BEGP(pt1);
deref_body(d0, pt1, execute_unk, execute_nvar);
execute_metacall:
ARG1 = ARG3 = d0;
pen = PredMetaCall;
ARG2 = Yap_cp_as_integer(b_ptr);
if (mod)
ARG4 = mod;
else
ARG4 = TermProlog;
goto execute_end;
ENDP(pt1);
/* at this point, we have the arguments all set in the argument registers, pen says who is the current predicate. don't remove. */
NoStackPExecute:
WRITEBACK_Y_AS_ENV();
#ifdef SHADOW_S
Yap_REGS.S_ = SREG;
#endif
saveregs_and_ycache();
d0 = interrupt_pexecute( pen PASS_REGS );
setregs_and_ycache();
#ifdef SHADOW_S
SREG = Yap_REGS.S_;
#endif
if (!d0) FAIL();
if (d0 == 2) goto execute_stack_checked;
goto execute_end;
ENDBOp();
ENDD(d0);
ENDCACHE_Y_AS_ENV();
}