/* This file is part of the indirect Perl module.
* See http://search.cpan.org/dist/indirect/ */
/* This header provides a specialized version of Scope::Upper::reap that can be
* called directly from XS.
* See http://search.cpan.org/dist/Scope-Upper/ for details. */
#ifndef REAP_H
#define REAP_H 1
#define REAP_DESTRUCTOR_SIZE 3
typedef struct {
I32 depth;
I32 *origin;
void (*cb)(pTHX_ void *);
void *ud;
char *dummy;
} reap_ud;
STATIC void reap_pop(pTHX_ void *);
STATIC void reap_pop(pTHX_ void *ud_) {
reap_ud *ud = ud_;
I32 depth, *origin, mark, base;
depth = ud->depth;
origin = ud->origin;
mark = origin[depth];
base = origin[depth - 1];
if (base < mark) {
PL_savestack_ix = mark;
leave_scope(base);
}
PL_savestack_ix = base;
if ((ud->depth = --depth) > 0) {
SAVEDESTRUCTOR_X(reap_pop, ud);
} else {
void (*cb)(pTHX_ void *) = ud->cb;
void *cb_ud = ud->ud;
PerlMemShared_free(ud->origin);
PerlMemShared_free(ud);
SAVEDESTRUCTOR_X(cb, cb_ud);
}
}
STATIC void reap(pTHX_ I32 depth, void (*cb)(pTHX_ void *), void *cb_ud) {
#define reap(D, CB, UD) reap(aTHX_ (D), (CB), (UD))
reap_ud *ud;
I32 i;
if (depth > PL_scopestack_ix)
depth = PL_scopestack_ix;
ud = PerlMemShared_malloc(sizeof *ud);
ud->depth = depth;
ud->origin = PerlMemShared_malloc((depth + 1) * sizeof *ud->origin);
ud->cb = cb;
ud->ud = cb_ud;
ud->dummy = NULL;
for (i = depth; i >= 1; --i) {
I32 j = PL_scopestack_ix - i;
ud->origin[depth - i] = PL_scopestack[j];
PL_scopestack[j] += REAP_DESTRUCTOR_SIZE;
}
ud->origin[depth] = PL_savestack_ix;
while (PL_savestack_ix + REAP_DESTRUCTOR_SIZE
<= PL_scopestack[PL_scopestack_ix - 1]) {
save_pptr(&ud->dummy);
}
SAVEDESTRUCTOR_X(reap_pop, ud);
}
#endif /* REAP_H */