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 852b2b155b0b13b6118f81ff5e80e7c528d337ad..f999495c877581362bc25101e67877511107a678 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 1.154 2009/11/29 03:02:27 tgl Exp $
+ *   $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.155 2009/11/29 21:02:16 tgl Exp $
  *
  **********************************************************************/
 
@@ -1651,11 +1651,13 @@ 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);
        }
    }