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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "BUtils.h"
/* Stolen from pp_ctl.c (with modifications) */
static I32
BUtils_dopoptosub_at(pTHX_ PERL_CONTEXT *cxstk, I32 startingblock)
{
dTHR;
I32 i;
PERL_CONTEXT *cx;
for (i = startingblock; i >= 0; i--) {
cx = &cxstk[i];
switch (CxTYPE(cx)) {
default:
continue;
/*case CXt_EVAL:*/
case CXt_SUB:
/* In Perl 5.005, formats just used CXt_SUB */
#ifdef CXt_FORMAT
case CXt_FORMAT:
#endif
DEBUG_l( Perl_deb(aTHX_ "(Found sub #%ld)\n", (long)i));
return i;
}
}
return i;
}
static I32
BUtils_dopoptosub(pTHX_ I32 startingblock)
{
dTHR;
return BUtils_dopoptosub_at(aTHX_ cxstack, startingblock);
}
/* This function is based on the code of pp_caller */
PERL_CONTEXT*
BUtils_op_upcontext(pTHX_ I32 count, COP **cop_p, PERL_CONTEXT **ccstack_p,
I32 *cxix_from_p, I32 *cxix_to_p)
{
PERL_SI *top_si = PL_curstackinfo;
I32 cxix = BUtils_dopoptosub(aTHX_ cxstack_ix);
PERL_CONTEXT *ccstack = cxstack;
if (cxix_from_p) *cxix_from_p = cxstack_ix+1;
if (cxix_to_p) *cxix_to_p = cxix;
for (;;) {
/* we may be in a higher stacklevel, so dig down deeper */
while (cxix < 0 && top_si->si_type != PERLSI_MAIN) {
top_si = top_si->si_prev;
ccstack = top_si->si_cxstack;
cxix = BUtils_dopoptosub_at(aTHX_ ccstack, top_si->si_cxix);
if (cxix_to_p && cxix_from_p) *cxix_from_p = *cxix_to_p;
if (cxix_to_p) *cxix_to_p = cxix;
}
if (cxix < 0 && count == 0) {
if (ccstack_p) *ccstack_p = ccstack;
return (PERL_CONTEXT *)0;
}
else if (cxix < 0)
return (PERL_CONTEXT *)-1;
if (PL_DBsub && cxix >= 0 &&
ccstack[cxix].blk_sub.cv == GvCV(PL_DBsub))
count++;
if (!count--)
break;
if (cop_p) *cop_p = ccstack[cxix].blk_oldcop;
cxix = BUtils_dopoptosub_at(aTHX_ ccstack, cxix - 1);
if (cxix_to_p && cxix_from_p) *cxix_from_p = *cxix_to_p;
if (cxix_to_p) *cxix_to_p = cxix;
}
if (ccstack_p) *ccstack_p = ccstack;
return &ccstack[cxix];
}
/* The most popular error message */
#define TOO_FAR \
croak("want: Called from outside a subroutine")
/* Between 5.9.1 and 5.9.2 the retstack was removed, and the
return op is now stored on the cxstack. */
#define HAS_RETSTACK (\
PERL_REVISION < 5 || \
(PERL_REVISION == 5 && PERL_VERSION < 9) || \
(PERL_REVISION == 5 && PERL_VERSION == 9 && PERL_SUBVERSION < 2) \
)
OP*
BUtils_find_return_op(pTHX_ I32 uplevel)
{
PERL_CONTEXT *cx = BUtils_op_upcontext(aTHX_ uplevel, 0, 0, 0, 0);
if (!cx) TOO_FAR;
#if HAS_RETSTACK
return PL_retstack[cx->blk_oldretsp - 1];
#else
return cx->blk_sub.retop;
#endif
}
OP*
BUtils_find_oldcop(pTHX_ I32 uplevel)
{
PERL_CONTEXT *cx = BUtils_op_upcontext(aTHX_ uplevel, 0, 0, 0, 0);
if (!cx) TOO_FAR;
return (OP*) cx->blk_oldcop;
}
MODULE = B::Utils::OP PACKAGE = B::Utils::OP PREFIX = BUtils_OP_
PROTOTYPES: DISABLE
B::OP
parent_op(I32 uplevel)
CODE:
RETVAL = BUtils_find_oldcop(aTHX_ uplevel);
OUTPUT:
RETVAL
B::OP
return_op(I32 uplevel)
CODE:
RETVAL = BUtils_find_return_op(aTHX_ uplevel);
OUTPUT:
RETVAL
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