[RFA] Set stop_pc when TARGET_WAITKIND_NO_HISTORY

[teawater <teawater@gmail.com>]

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Hi Michael,

I try the 20080930 branch and got:
(gdb) start
Temporary breakpoint 1 at 0x80483c1: file 1.c, line 20.
Starting program: /home/teawater/rec/a.out

Temporary breakpoint 1, main () at 1.c:20
20	       int     b = 0;
(gdb) record
(gdb) n
21	       int     c = 1;
(gdb)
24		printf ("a = %d b = %d c = %d\n", a, b, c);
(gdb)
a = 0 b = 0 c = 1
25	       b = cool ();
(gdb) rn

No more reverse-execution history.
main () at 1.c:20
20	       int     b = 0;
(gdb) n
Cannot find bounds of current function

This is because:
    case TARGET_WAITKIND_NO_HISTORY:
      /* Reverse execution: target ran out of history info.  */
      print_stop_reason (NO_HISTORY, 0);
      stop_stepping (ecs);
      return;

This place doesn't set stop_pc but in step_1:
		  if (find_pc_partial_function (stop_pc, &name,
						&tp->step_range_start,
						&tp->step_range_end) == 0)
		    error (_("Cannot find bounds of current function"));

So I add code to set stop_pc. I think this bug will affect main tree
too. So this patch is for both 20080930 branch and main tree.

2008-10-19  Hui Zhu  <teawater@gmail.com>

	* infrun.c (handle_inferior_event): Set "stop_pc" when
	TARGET_WAITKIND_NO_HISTORY.

Thanks,
Hui

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--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-10-19  Hui Zhu  <teawater@gmail.com>
+
+	* infrun.c (handle_inferior_event): Set "stop_pc" when
+	TARGET_WAITKIND_NO_HISTORY.
+
 2008-10-18  Pedro Alves  <pedro@codesourcery.com>
 
 	* infrun.c (adjust_pc_after_break): Do nothing if executing in
--- a/infrun.c
+++ b/infrun.c
@@ -2237,6 +2237,7 @@ handle_inferior_event (struct execution_
 
     case TARGET_WAITKIND_NO_HISTORY:
       /* Reverse execution: target ran out of history info.  */
+      stop_pc = read_pc ();
       print_stop_reason (NO_HISTORY, 0);
       stop_stepping (ecs);
       return;