[PATCH 1/2] Add an undwinder_name field to "struct frame_unwind" for use by "info frame".

[Samuel Bronson <naesten at gmail dot com>]

Have "info frame" display this field when present.

Fill in the field for unwinders (besides the sentinel) which are
normally built on i386 Linux.

Signed-off-by: Samuel Bronson <naesten@gmail.com>
---
 gdb/dummy-frame.c  |    2 ++
 gdb/dwarf2-frame.c |    8 ++++++--
 gdb/frame-unwind.h |    1 +
 gdb/frame.c        |    7 +++++++
 gdb/frame.h        |    3 +++
 gdb/i386-tdep.c    |    8 ++++++--
 gdb/stack.c        |   10 +++++++++-
 gdb/tramp-frame.c  |    1 +
 8 files changed, 35 insertions(+), 5 deletions(-)

diff --git a/gdb/dummy-frame.c b/gdb/dummy-frame.c
index 6e63686..59990c1 100644
--- a/gdb/dummy-frame.c
+++ b/gdb/dummy-frame.c
@@ -278,6 +278,8 @@ static const struct frame_unwind dummy_frame_unwinder =
   dummy_frame_prev_register,
   NULL,
   dummy_frame_sniffer,
+  NULL,
+  "dummy_frame_unwinder",
 };
 
 const struct frame_unwind *const dummy_frame_unwind = {
diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index ce11d89..c90bd08 100644
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -1183,7 +1183,9 @@ static const struct frame_unwind dwarf2_frame_unwind =
   dwarf2_frame_this_id,
   dwarf2_frame_prev_register,
   NULL,
-  dwarf2_frame_sniffer
+  dwarf2_frame_sniffer,
+  NULL,
+  "dwarf2_frame_unwind",
 };
 
 static const struct frame_unwind dwarf2_signal_frame_unwind =
@@ -1192,7 +1194,9 @@ static const struct frame_unwind dwarf2_signal_frame_unwind =
   dwarf2_frame_this_id,
   dwarf2_frame_prev_register,
   NULL,
-  dwarf2_frame_sniffer
+  dwarf2_frame_sniffer,
+  NULL,
+  "dwarf2_signal_frame_unwind",
 };
 
 /* Append the DWARF-2 frame unwinders to GDBARCH's list.  */
diff --git a/gdb/frame-unwind.h b/gdb/frame-unwind.h
index 35eeebf..4da7fcc 100644
--- a/gdb/frame-unwind.h
+++ b/gdb/frame-unwind.h
@@ -133,6 +133,7 @@ struct frame_unwind
   const struct frame_data *unwind_data;
   frame_sniffer_ftype *sniffer;
   frame_dealloc_cache_ftype *dealloc_cache;
+  const char *unwinder_name;
 };
 
 /* Register a frame unwinder, _prepending_ it to the front of the
diff --git a/gdb/frame.c b/gdb/frame.c
index b0a99fb..1319f3a 100644
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -1824,6 +1824,13 @@ frame_stop_reason_string (enum unwind_stop_reason reason)
     }
 }
 
+/* Return unwinder name */
+
+const char *get_frame_unwinder_name (struct frame_info *frame)
+{
+  return frame->unwind->unwinder_name;
+}
+
 /* Clean up after a failed (wrong unwinder) attempt to unwind past
    FRAME.  */
 
diff --git a/gdb/frame.h b/gdb/frame.h
index 224aec9..b4a0871 100644
--- a/gdb/frame.h
+++ b/gdb/frame.h
@@ -422,6 +422,9 @@ enum unwind_stop_reason get_frame_unwind_stop_reason (struct frame_info *);
 
 const char *frame_stop_reason_string (enum unwind_stop_reason);
 
+/* Return the name of the frame's unwinder (or NULL) */
+const char *get_frame_unwinder_name (struct frame_info *);
+
 /* Unwind the stack frame so that the value of REGNUM, in the previous
    (up, older) frame is returned.  If VALUEP is NULL, don't
    fetch/compute the value.  Instead just return the location of the
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c
index c2515fe..bc35279 100644
--- a/gdb/i386-tdep.c
+++ b/gdb/i386-tdep.c
@@ -1467,7 +1467,9 @@ static const struct frame_unwind i386_frame_unwind =
   i386_frame_this_id,
   i386_frame_prev_register,
   NULL,
-  default_frame_sniffer
+  default_frame_sniffer,
+  NULL,
+  "i386_frame_unwind",
 };
 
 
@@ -1567,7 +1569,9 @@ static const struct frame_unwind i386_sigtramp_frame_unwind =
   i386_sigtramp_frame_this_id,
   i386_sigtramp_frame_prev_register,
   NULL,
-  i386_sigtramp_frame_sniffer
+  i386_sigtramp_frame_sniffer,
+  NULL,
+  "i386_sigtramp_frame_unwind",
 };
 
 
diff --git a/gdb/stack.c b/gdb/stack.c
index cc56125..1169d59 100644
--- a/gdb/stack.c
+++ b/gdb/stack.c
@@ -1151,7 +1151,8 @@ frame_info (char *addr_exp, int from_tty)
     int count;
     int i;
     int need_nl = 1;
-
+    const char *unwinder;
+    
     /* The sp is special; what's displayed isn't the save address, but
        the value of the previous frame's sp.  This is a legacy thing,
        at one stage the frame cached the previous frame's SP instead
@@ -1198,6 +1199,13 @@ frame_info (char *addr_exp, int from_tty)
 	/* else keep quiet.  */
       }
 
+    unwinder = get_frame_unwinder_name(fi);
+    if (unwinder)
+      {
+	printf_filtered(" Unwinder: %s\n", unwinder);
+	need_nl = 0;
+      }
+
     count = 0;
     numregs = gdbarch_num_regs (gdbarch)
 	      + gdbarch_num_pseudo_regs (gdbarch);
diff --git a/gdb/tramp-frame.c b/gdb/tramp-frame.c
index 46d32fd..0880113 100644
--- a/gdb/tramp-frame.c
+++ b/gdb/tramp-frame.c
@@ -157,5 +157,6 @@ tramp_frame_prepend_unwinder (struct gdbarch *gdbarch,
   unwinder->sniffer = tramp_frame_sniffer;
   unwinder->this_id = tramp_frame_this_id;
   unwinder->prev_register = tramp_frame_prev_register;
+  unwinder->unwinder_name = "tramp-frame.c";
   frame_unwind_prepend_unwinder (gdbarch, unwinder);
 }
-- 
1.6.3.1.169.g33fd.dirty