- /* orig_array remains unchanged throughout the loop. If after freeing all
- the entries it turns out that one of the little blighters has triggered
- an action that has caused HvARRAY to be re-allocated, then we set
- array to the new HvARRAY, and try again. */
-
- while (1) {
- /* This is the one we're going to try to empty. First time round
- it's the original array. (Hopefully there will only be 1 time
- round) */
- HE ** const array = HvARRAY(hv);
- I32 i = HvMAX(hv);
-
- /* Because we have taken xhv_name out, the only allocated pointer
- in the aux structure that might exist is the backreference array.
- */
-
- if (SvOOK(hv)) {
- HE *entry;
- struct mro_meta *meta;
- struct xpvhv_aux *iter = HvAUX(hv);
- /* weak references: if called from sv_clear(), the backrefs
- * should already have been killed; if there are any left, its
- * because we're doing hv_clear() or hv_undef(), and the HV
- * will continue to live.
- * Because while freeing the entries we fake up a NULL HvARRAY
- * (and hence HvAUX), we need to store the backref array
- * somewhere else; but it still needs to be visible in case
- * any the things we free happen to call sv_del_backref().
- * We do this by storing it in magic instead.
- * If, during the entry freeing, a destructor happens to add
- * a new weak backref, then sv_add_backref will look in both
- * places (magic in HvAUX) for the AV, but will create a new
- * AV in HvAUX if it can't find one (if it finds it in magic,
- * it moves it back into HvAUX. So at the end of the iteration
- * we have to allow for this. */
-
-
- if (iter->xhv_backreferences) {
- if (SvTYPE(iter->xhv_backreferences) == SVt_PVAV) {
- /* The sv_magic will increase the reference count of the AV,
- so we need to drop it first. */
- SvREFCNT_dec(iter->xhv_backreferences);
- if (AvFILLp(iter->xhv_backreferences) == -1) {
- /* Turns out that the array is empty. Just free it. */
- SvREFCNT_dec(iter->xhv_backreferences);
-
- } else {
- sv_magic(MUTABLE_SV(hv),
- MUTABLE_SV(iter->xhv_backreferences),
- PERL_MAGIC_backref, NULL, 0);
- }
- }
- else {
- MAGIC *mg;
- sv_magic(MUTABLE_SV(hv), NULL, PERL_MAGIC_backref, NULL, 0);
- mg = mg_find(MUTABLE_SV(hv), PERL_MAGIC_backref);
- mg->mg_obj = (SV*)iter->xhv_backreferences;
- }
- iter->xhv_backreferences = NULL;
- }
-
- entry = iter->xhv_eiter; /* HvEITER(hv) */
- if (entry && HvLAZYDEL(hv)) { /* was deleted earlier? */
- HvLAZYDEL_off(hv);
- hv_free_ent(hv, entry);
- }
- iter->xhv_riter = -1; /* HvRITER(hv) = -1 */
- iter->xhv_eiter = NULL; /* HvEITER(hv) = NULL */
-
- if((meta = iter->xhv_mro_meta)) {
- if (meta->mro_linear_all) {
- SvREFCNT_dec(MUTABLE_SV(meta->mro_linear_all));
- meta->mro_linear_all = NULL;
- /* This is just acting as a shortcut pointer. */
- meta->mro_linear_current = NULL;
- } else if (meta->mro_linear_current) {
- /* Only the current MRO is stored, so this owns the data.
- */
- SvREFCNT_dec(meta->mro_linear_current);
- meta->mro_linear_current = NULL;
- }
- if(meta->mro_nextmethod) SvREFCNT_dec(meta->mro_nextmethod);
- SvREFCNT_dec(meta->isa);
- Safefree(meta);
- iter->xhv_mro_meta = NULL;
- }
-
- /* There are now no allocated pointers in the aux structure. */
-
- SvFLAGS(hv) &= ~SVf_OOK; /* Goodbye, aux structure. */
- /* What aux structure? */
- }
-
- /* make everyone else think the array is empty, so that the destructors
- * called for freed entries can't recursively mess with us */
- HvARRAY(hv) = NULL;
- ((XPVHV*) SvANY(hv))->xhv_keys = 0;