[PATCH v2 2/3] frame: use get_prev_frame_always in skip_tailcall_frames

[Markus Metzger <markus.t.metzger@intel.com>]

Following the practice in skip_artificial_frames, also use get_prev_frame_always
instead of get_prev_frame in skip_tailcall_frames.

2016-02-05  Markus Metzger  <markus.t.metzger@intel.com>

gdb/
	* frame.c (skip_tailcall_frames): Call get_prev_frame_always.
---
 gdb/frame.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gdb/frame.c b/gdb/frame.c
index b7832c7..6ab8834 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -443,8 +443,12 @@ skip_artificial_frames (struct frame_info *frame)
 struct frame_info *
 skip_tailcall_frames (struct frame_info *frame)
 {
+  /* Note we use get_prev_frame_always, and not get_prev_frame.  The
+     latter will truncate the frame chain, leading to this function
+     unintentionally returning a null_frame_id (e.g., when the user
+     sets a backtrace limit).  */
   while (get_frame_type (frame) == TAILCALL_FRAME)
-    frame = get_prev_frame (frame);
+    frame = get_prev_frame_always (frame);
 
   return frame;
 }
-- 
1.8.3.1