plperl: memory usage stacking

In plperl.c, there are some memory leaks, fixed in the following diff file.
Becuase Perl_eval_pv doesnot release stack, repitition of calling
'plperl_trigger_build_args' makes stack growing up.

The next simple example exhaust memory:(using perl v5.8.0)
while (1) {
AV *av = newAV();
av_undef(av);
}.
I cannot understand the behavior of AV, so, plperl_get_keys, plperl_get_key, and
plperl_get_elem are deleted, and simply implemented by hv_iter* inlined in the
loop.

Tetsuya.

diff plperl.c plperl.c.org

236,237c236
< SV *rv = NULL;
< SV *ret = NULL;
---
> SV *rv;
239d237
< char *s;
305,309c303
< ENTER;
< SAVETMPS;
< ret = newSVsv (perl_eval_pv(SvPV(rv, PL_na), TRUE));
< FREETMPS;
< LEAVE;
---
> rv = perl_eval_pv(SvPV(rv, PL_na), TRUE);
312d305
< SvREFCNT_dec(rv);
314c307
< return ret;
---
> return rv;
320a314,316
> char *key;
> I32 klen;
> SV *val;
325,326c321
< hv_iterinit(hv);
< while (hv_iternext(hv)){
---
> while (val = hv_iternextsv(hv, (char**)&key, &klen)){
332a328,371
> static
> AV*
> plperl_get_keys(HV* hv)
> {
> AV *ret;
> SV **svp;
> int key_count;
> SV *val;
> char *key;
> I32 klen;
> key_count = 0;
> ret = newAV();
>
> while (val = hv_iternextsv(hv, (char**)&key, &klen)){
> av_store(ret, key_count, eval_pv(key, TRUE));
> key_count++;
> }
>
> return ret;
> }
>
> static
> char*
> plperl_get_key(AV* keys, int index)
> {
> SV **svp;
> int av_len;
>
> av_len = av_len(keys)+1;
> if (index < av_len) svp = av_fetch(keys, index, FALSE); else return NULL;
> return SvPV(*svp, PL_na);
> }
>
> static
> char*
> plperl_get_elem(HV* hash, char* key)
> {
> SV **svp;
> if (hv_exists_ent(hash, eval_pv(key, TRUE), FALSE))
> svp = hv_fetch(hash, key, strlen(key), FALSE); else return NULL;
>
> return SvPV(*svp, PL_na);
> }
>
363a403
> plkeys = plperl_get_keys(hvNew);
382d421
< hv_iterinit(hvNew);
384a424
> char *src;
388,389d427
< I32 retlen;
< SV *sv;
391,396c429,430
< sv = hv_iternextsv(hvNew, &platt, &retlen);
< if (sv == NULL)
< elog(FATAL, "plperl: interpreter is probably corrupted");
< plval = SvPV(sv, PL_na);
< if (plval == NULL)
< elog(FATAL, "plperl: interpreter is probably corrupted");
---
>
> platt = plperl_get_key(plkeys, j);
403a438,440
> plval = plperl_get_elem(hvNew, platt);
> if (plval == NULL)
> elog(FATAL, "plperl: interpreter is probably corrupted");
413,428c450,455
< Oid ti;
<
< ti = SPI_gettypeid(tupdesc, modattrs[j]);
< if ( ( (ti != TEXTOID) && (ti != BPCHAROID) && (ti != VARCHAROID) ) && ( (strlen(plval) == 0) || (strcmp(plval, "(null)") == 0) ) )
< {
< modvalues[j] = (Datum) 0;
< modnulls[j] = 'n';
< }
< else
< {
< modvalues[j] = FunctionCall3(&finfo,
< CStringGetDatum(plval),
< ObjectIdGetDatum(typelem),
< Int32GetDatum(tupdesc->attrs[atti]->atttypmod));
< modnulls[j] = ' ';
< }
---
> src = plval;
> modvalues[j] = FunctionCall3(&finfo,
> CStringGetDatum(src),
> ObjectIdGetDatum(typelem),
> Int32GetDatum(tupdesc->attrs[atti]->atttypmod));
> modnulls[j] = ' ';
877d903
< SvREFCNT_dec(svTD);