[PATCH v2 1/3] frame: add skip_tailcall_frames

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

Add a new function skip_tailcall_frames to skip TAILCALL_FRAME frames.

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

gdb/
	* frame.h (skip_tailcall_frames): New.
	* frame.c (skip_tailcall_frames): New.
	(frame_pop): Call skip_tailcall_frames.
	* infcmd.c: Call skip_tailcall_frames.
---
 gdb/frame.c  | 14 ++++++++++++--
 gdb/frame.h  |  4 ++++
 gdb/infcmd.c |  3 +--
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/gdb/frame.c b/gdb/frame.c
index 48c9b33..b7832c7 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -438,6 +438,17 @@ skip_artificial_frames (struct frame_info *frame)
   return frame;
 }
 
+/* See frame.h.  */
+
+struct frame_info *
+skip_tailcall_frames (struct frame_info *frame)
+{
+  while (get_frame_type (frame) == TAILCALL_FRAME)
+    frame = get_prev_frame (frame);
+
+  return frame;
+}
+
 /* Compute the frame's uniq ID that can be used to, later, re-find the
    frame.  */
 
@@ -972,8 +983,7 @@ frame_pop (struct frame_info *this_frame)
 
   /* Ignore TAILCALL_FRAME type frames, they were executed already before
      entering THISFRAME.  */
-  while (get_frame_type (prev_frame) == TAILCALL_FRAME)
-    prev_frame = get_prev_frame (prev_frame);
+  prev_frame = skip_tailcall_frames (prev_frame);
 
   /* Make a copy of all the register values unwound from this frame.
      Save them in a scratch buffer so that there isn't a race between
diff --git a/gdb/frame.h b/gdb/frame.h
index 2e05dfa..7e8b01e 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -820,5 +820,9 @@ extern int frame_unwinder_is (struct frame_info *fi,
 
 extern enum language get_frame_language (struct frame_info *frame);
 
+/* Return the first non-tailcall frame above FRAME or FRAME if it is not a
+   tailcall frame.  */
+
+extern struct frame_info *skip_tailcall_frames (struct frame_info *frame);
 
 #endif /* !defined (FRAME_H)  */
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index df13896..930dc61 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -2002,8 +2002,7 @@ finish_command (char *arg, int from_tty)
 
   /* Ignore TAILCALL_FRAME type frames, they were executed already before
      entering THISFRAME.  */
-  while (get_frame_type (frame) == TAILCALL_FRAME)
-    frame = get_prev_frame (frame);
+  frame = skip_tailcall_frames (frame);
 
   /* Find the function we will return from.  */
 
-- 
1.8.3.1