Fix session-lifespan memory leak when a plperl function is redefined:

we have to tell Perl it can release its compiled copy of the function
text.  Noted by Alexey Klyukin.

Back-patch to 8.2 --- the problem exists further back, but this patch
won't work without modification, and it's probably not worth the trouble.

diff --git a/src/pl/plperl/plperl.c b/src/pl/plperl/plperl.c
index d2ea5b58833d939932df512f9d4dda7b5155888c..b807fcc3c0ed3bb0d20b5bdd07304f176e74e0ec 100644 (file)
--- a/src/pl/plperl/plperl.c
+++ b/src/pl/plperl/plperl.c
@@ -1,7 +1,7 @@
 /**********************************************************************
  * plperl.c - perl as a procedural language for PostgreSQL
  *
- *   $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.150.2.2 2009/10/31 18:12:05 tgl Exp $
+ *   $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.150.2.3 2009/11/29 21:02:22 tgl Exp $
  *
  **********************************************************************/
 
@@ -1528,11 +1528,13 @@ compile_plperl_function(Oid fn_oid, bool is_trigger)
 
        if (!uptodate)
        {
+           hash_search(plperl_proc_hash, internal_proname,
+                       HASH_REMOVE, NULL);
+           if (prodesc->reference)
+               SvREFCNT_dec(prodesc->reference);
            free(prodesc->proname);
            free(prodesc);
            prodesc = NULL;
-           hash_search(plperl_proc_hash, internal_proname,
-                       HASH_REMOVE, NULL);
        }
    }