From 3176a27e6360ead42d67062ffa17dcf137dfc82f Mon Sep 17 00:00:00 2001
From: Gerd Moellmann <gerd@gnu.org>
Date: Tue, 24 Oct 2000 10:55:57 +0000
Subject: [PATCH] (xbacktrace): Handle case that $bt->function isn't a symbol.

---
 src/.gdbinit | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/.gdbinit b/src/.gdbinit
index 3d72ea9101..fbad00bcc5 100644
--- a/src/.gdbinit
+++ b/src/.gdbinit
@@ -315,14 +315,26 @@ end
 define xbacktrace
   set $bt = backtrace_list
   while $bt 
-    xprintsym *$bt->function
+    set $type = (enum Lisp_Type) ((*$bt->function >> gdb_valbits) & 0x7)
+    if $type == Lisp_Symbol
+      xprintsym *$bt->function
+    else
+      printf "0x%x ", *$bt->function
+      if $type == Lisp_Vectorlike
+        set $size = ((struct Lisp_Vector *) ((*$bt->function & $valmask) | gdb_data_seg_bits))->size
+        output (enum pvec_type) (($size & PVEC_FLAG) ? $size & PVEC_TYPE_MASK : 0)
+      else
+        printf "Lisp type %d", $type
+      end
+      echo \n
+    end
     set $bt = $bt->next
   end
 end
 document xbacktrace
   Print a backtrace of Lisp function calls from backtrace_list.
   Set a breakpoint at Fsignal and call this to see from where 
-  an error was signalled.
+  an error was signaled.
 end
 
 define xreload
-- 
2.20.1