[PATCH] Fix DF mw_hardregs memory leaks (PR middle-end/56461)

[Jakub Jelinek]

Hi!

We can leak mw_hardregs memory in some cases.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux,
ok for trunk?

2013-02-27  Jakub Jelinek  <ja...@redhat.com>

        PR middle-end/56461
        * df-scan.c (df_insn_delete): Use df_scan_free_mws_vec before
        pool_free.
        (df_insn_rescan_debug_internal): Use df_scan_free_mws_vec before
        overwriting it.

--- gcc/df-scan.c.jj    2013-01-11 09:02:45.000000000 +0100
+++ gcc/df-scan.c       2013-02-27 10:01:13.052826959 +0100
@@ -1153,6 +1153,7 @@ df_insn_delete (basic_block bb, unsigned
          df_ref_chain_delete (insn_info->defs);
          df_ref_chain_delete (insn_info->uses);
          df_ref_chain_delete (insn_info->eq_uses);
+         df_scan_free_mws_vec (insn_info->mw_hardregs);
        }
       pool_free (problem_data->insn_pool, insn_info);
       DF_INSN_UID_SET (uid, NULL);
@@ -1332,6 +1333,7 @@ df_insn_rescan_debug_internal (rtx insn)
   df_ref_chain_delete (insn_info->defs);
   df_ref_chain_delete (insn_info->uses);
   df_ref_chain_delete (insn_info->eq_uses);
+  df_scan_free_mws_vec (insn_info->mw_hardregs);
 
   insn_info->defs = df_null_ref_rec;
   insn_info->uses = df_null_ref_rec;

        Jakub