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Re: [RFA] Fix off-by-one error in record.c (record_list_release_first)


OK, going to commit it.

Hui Zhu wrote:
Thanks Michael, I think this patch is OK with me.

Hui

On Wed, Oct 14, 2009 at 02:01, Michael Snyder <msnyder@vmware.com> wrote:
Hui Zhu wrote:
Thanks Michael and Jilin,

I think the Michael's patch is more spend up.  Jilin's patch is more
clear and can handle set_record_insn_max_num.

I suggest we choice speed up. Do you think it's OK?

If we choice it, Michael, could you please add some comments to
"record_list_release_first" or change it's name to
"record_list_release_first_without_update_xxx" to make it clear.
And please update set_record_insn_max_num.
Hah, sorry, I completely missed the implications for
set_record_insn_max_num.  Thanks Jilin for catching it.

New diff:


2009-10-12 Michael Snyder <msnyder@vmware.com>


       * record.c (record_list_release_first): Do not decrement
       record_insn_num.
       (set_insn_num_max): Remove printf.
       Decrement record_insn_num in the loop.

Index: record.c
===================================================================
RCS file: /cvs/src/src/gdb/record.c,v
retrieving revision 1.20
diff -u -p -r1.20 record.c
--- record.c    27 Sep 2009 02:49:34 -0000      1.20
+++ record.c    13 Oct 2009 18:04:44 -0000
@@ -177,6 +177,11 @@ record_list_release_next (void)
    }
 }

+/* Delete the first instruction from the beginning of the log, to make
+   room for adding a new instruction at the end of the log.
+
+   Note -- this function does not modify record_insn_num.  */
+
 static void
 record_list_release_first (void)
 {
@@ -209,8 +214,6 @@ record_list_release_first (void)
      if (type == record_end)
       break;
    }
-
-  record_insn_num--;
 }

 /* Add a struct record_entry to record_arch_list.  */
@@ -1260,12 +1263,12 @@ set_record_insn_max_num (char *args, int
 {
  if (record_insn_num > record_insn_max_num && record_insn_max_num)
    {
-      printf_unfiltered (_("Record instructions number is bigger than "
-                          "record instructions max number.  Auto delete "
-                          "the first ones?\n"));
-
+      /* Count down record_insn_num while releasing records from list.  */
      while (record_insn_num > record_insn_max_num)
-       record_list_release_first ();
+       {
+         record_list_release_first ();
+         record_insn_num--;
+       }
    }
 }





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