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+# Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 2000, 2001
+#   Free Software Foundation, Inc.
+#
+# This file is part of GNU Emacs.
+#
+# GNU Emacs is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# GNU Emacs is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Emacs; see the file COPYING.  If not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+# Force loading of symbols, enough to give us gdb_valbits etc.
+set main
+
+# Find lwlib source files too.
+dir ../lwlib
+#dir /gd/gnu/lesstif-0.89.9/lib/Xm
+
+# Don't enter GDB when user types C-g to quit.
+# This has one unfortunate effect: you can't type C-c
+# at the GDB to stop Emacs, when using X.
+# However, C-z works just as well in that case.
+handle 2 noprint pass
+
+# Don't pass SIGALRM to Emacs.  This makes problems when
+# debugging.
+handle SIGALRM ignore
+
+# Set up a mask to use.
+# This should be EMACS_INT, but in some cases that is a macro.
+# long ought to work in all cases right now.
+set $valmask = ((long)1 << gdb_valbits) - 1
+set $nonvalbits = gdb_emacs_intbits - gdb_valbits
+
+# Set up something to print out s-expressions.
+define pr
+set debug_print ($)
+end
+document pr
+Print the emacs s-expression which is $.
+Works only when an inferior emacs is executing.
+end
+
+define xtype
+output (enum Lisp_Type) (($.i >> gdb_valbits) & 0x7)
+echo \n
+output ((($.i >> gdb_valbits) & 0x7) == Lisp_Misc ? (enum Lisp_Misc_Type) (((struct Lisp_Free *) (($.i & $valmask) | gdb_data_seg_bits))->type) : (($.i >> gdb_valbits) & 0x7) == Lisp_Vectorlike ? ($size = ((struct Lisp_Vector *) (($.i & $valmask) | gdb_data_seg_bits))->size, (enum pvec_type) (($size & PVEC_FLAG) ? $size & PVEC_TYPE_MASK : 0)) : 0)
+echo \n
+end
+document xtype
+Print the type of $, assuming it is an Emacs Lisp value.
+If the first type printed is Lisp_Vector or Lisp_Misc,
+the second line gives the more precise type.
+Otherwise the second line doesn't mean anything.
+end
+
+define xvectype
+  set $size = ((struct Lisp_Vector *) (($.i & $valmask) | gdb_data_seg_bits))->size
+  output (enum pvec_type) (($size & PVEC_FLAG) ? $size & PVEC_TYPE_MASK : 0)
+  echo \n
+end
+document xvectype
+  Print the vector subtype of $, assuming it is a vector or pseudovector.
+end
+
+define xmisctype
+  output (enum Lisp_Misc_Type) (((struct Lisp_Free *) (($.i & $valmask) | gdb_data_seg_bits))->type)
+  echo \n
+end
+document xmisctype
+  Print the specific type of $, assuming it is some misc type.
+end
+
+define xint
+  print (($.i & $valmask) << $nonvalbits) >> $nonvalbits
+end
+document xint
+  Print $, assuming it is an Emacs Lisp integer.  This gets the sign right.
+end
+
+define xptr
+  print (void *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xptr
+  Print the pointer portion of $, assuming it is an Emacs Lisp value.
+end
+
+define xmarker
+  print (struct Lisp_Marker *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xmarker
+  Print $ as a marker pointer, assuming it is an Emacs Lisp marker value.
+end
+
+define xoverlay
+  print (struct Lisp_Overlay *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xoverlay
+  Print $ as a overlay pointer, assuming it is an Emacs Lisp overlay value.
+end
+
+define xmiscfree
+  print (struct Lisp_Free *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xmiscfree
+  Print $ as a misc free-cell pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xintfwd
+  print (struct Lisp_Intfwd *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xintfwd
+  Print $ as an integer forwarding pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xboolfwd
+  print (struct Lisp_Boolfwd *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xboolfwd
+  Print $ as a boolean forwarding pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xobjfwd
+  print (struct Lisp_Objfwd *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xobjfwd
+  Print $ as an object forwarding pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xbufobjfwd
+  print (struct Lisp_Buffer_Objfwd *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xbufobjfwd
+  Print $ as a buffer-local object forwarding pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xkbobjfwd
+  print (struct Lisp_Kboard_Objfwd *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xkbobjfwd
+  Print $ as a kboard-local object forwarding pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xbuflocal
+  print (struct Lisp_Buffer_Local_Value *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xbuflocal
+  Print $ as a buffer-local-value pointer, assuming it is an Emacs Lisp Misc value.
+end
+
+define xsymbol
+  print (struct Lisp_Symbol *) (($.i & $valmask) | gdb_data_seg_bits)
+  xprintsymptr $
+end
+document xsymbol
+  Print the name and address of the symbol $.
+  This command assumes that $ is an Emacs Lisp symbol value.
+end
+
+define xstring
+  print (struct Lisp_String *) (($.i & $valmask) | gdb_data_seg_bits)
+  output ($->size > 1000) ? 0 : ($->data[0])@($->size_byte < 0 ? $->size : $->size_byte)
+  echo \n
+end
+document xstring
+  Print the contents and address of the string $.
+  This command assumes that $ is an Emacs Lisp string value.
+end
+
+define xvector
+  print (struct Lisp_Vector *) (($.i & $valmask) | gdb_data_seg_bits)
+  output ($->size > 50) ? 0 : ($->contents[0])@($->size)
+  echo \n
+end
+document xvector
+  Print the contents and address of the vector $.
+  This command assumes that $ is an Emacs Lisp vector value.
+end
+
+define xprocess
+  print (struct Lisp_Process *) (($.i & $valmask) | gdb_data_seg_bits)
+  output *$
+  echo \n
+end
+document xprocess
+  Print the address of the struct Lisp_process which the Lisp_Object $ points to.
+end
+
+define xframe
+  print (struct frame *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xframe
+  Print $ as a frame pointer, assuming it is an Emacs Lisp frame value.
+end
+
+define xcompiled
+  print (struct Lisp_Vector *) (($.i & $valmask) | gdb_data_seg_bits)
+  output ($->contents[0])@($->size & 0xff)
+end
+document xcompiled
+  Print $ as a compiled function pointer, assuming it is an Emacs Lisp compiled value.
+end
+
+define xwindow
+  print (struct window *) (($.i & $valmask) | gdb_data_seg_bits)
+  printf "%dx%d+%d+%d\n", $->width, $->height, $->left, $->top
+end
+document xwindow
+  Print $ as a window pointer, assuming it is an Emacs Lisp window value.
+  Print the window's position as "WIDTHxHEIGHT+LEFT+TOP".
+end
+
+define xwinconfig
+  print (struct save_window_data *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xwinconfig
+  Print $ as a window configuration pointer, assuming it is an Emacs Lisp window configuration value.
+end
+
+define xsubr
+  print (struct Lisp_Subr *) (($.i & $valmask) | gdb_data_seg_bits)
+  output *$
+  echo \n
+end
+document xsubr
+  Print the address of the subr which the Lisp_Object $ points to.
+end
+
+define xchartable
+  print (struct Lisp_Char_Table *) (($.i & $valmask) | gdb_data_seg_bits)
+  printf "Purpose: "
+  output (char*)&((struct Lisp_Symbol *) (($->purpose.i & $valmask) | gdb_data_seg_bits))->name->data
+  printf "  %d extra slots", ($->size & 0x1ff) - 388
+  echo \n
+end
+document xchartable
+  Print the address of the char-table $, and its purpose.
+  This command assumes that $ is an Emacs Lisp char-table value.
+end
+
+define xboolvector
+  print (struct Lisp_Bool_Vector *) (($.i & $valmask) | gdb_data_seg_bits)
+  output ($->size > 256) ? 0 : ($->data[0])@(($->size + 7)/ 8)
+  echo \n
+end
+document xboolvector
+  Print the contents and address of the bool-vector $.
+  This command assumes that $ is an Emacs Lisp bool-vector value.
+end
+
+define xbuffer
+  print (struct buffer *) (($.i & $valmask) | gdb_data_seg_bits)
+  output ((struct Lisp_String *) (($->name.i & $valmask) | gdb_data_seg_bits))->data
+  echo \n
+end
+document xbuffer
+  Set $ as a buffer pointer, assuming it is an Emacs Lisp buffer value.
+  Print the name of the buffer.
+end
+
+define xhashtable
+  print (struct Lisp_Hash_Table *) (($.i & $valmask) | gdb_data_seg_bits)
+end
+document xhashtable
+  Set $ as a hash table pointer, assuming it is an Emacs Lisp hash table value.
+end
+
+define xcons
+  print (struct Lisp_Cons *) (($.i & $valmask) | gdb_data_seg_bits)
+  output/x *$
+  echo \n
+end
+document xcons
+  Print the contents of $, assuming it is an Emacs Lisp cons.
+end
+
+define nextcons
+  p $.cdr
+  xcons
+end
+document nextcons
+  Print the contents of the next cell in a list.
+  This assumes that the last thing you printed was a cons cell contents
+  (type struct Lisp_Cons) or a pointer to one.
+end
+
+define xcar
+  print/x ((($.i >> gdb_valbits) & 0xf) == Lisp_Cons ? ((struct Lisp_Cons *) (($.i & $valmask) | gdb_data_seg_bits))->car : 0)
+end
+document xcar
+  Print the car of $, assuming it is an Emacs Lisp pair.
+end
+
+define xcdr
+  print/x ((($.i >> gdb_valbits) & 0xf) == Lisp_Cons ? ((struct Lisp_Cons *) (($.i & $valmask) | gdb_data_seg_bits))->cdr : 0)
+end
+document xcdr
+  Print the cdr of $, assuming it is an Emacs Lisp pair.
+end
+
+define xfloat
+  print ((struct Lisp_Float *) (($.i & $valmask) | gdb_data_seg_bits))->data
+end
+document xfloat
+  Print $ assuming it is a lisp floating-point number.
+end
+
+define xscrollbar
+  print (struct scrollbar *) (($.i & $valmask) | gdb_data_seg_bits)
+  output *$
+  echo \n
+end
+document xscrollbar
+  Print $ as a scrollbar pointer.
+end
+
+define xprintsym
+  set $sym = ((struct Lisp_Symbol *) (($arg0.i & $valmask) | gdb_data_seg_bits))
+  xprintsymptr $sym
+end
+document xprintsym
+  Print argument as a symbol.
+end
+define xprintsymptr
+  set $sym = $arg0
+  set $sym_name = ((struct Lisp_String *)(($sym->xname.i & $valmask) | gdb_data_seg_bits))
+  output ($sym_name->data[0])@($sym_name->size_byte < 0 ? $sym_name->size : $sym_name->size_byte)
+  echo \n
+end
+
+define xbacktrace
+  set $bt = backtrace_list
+  while $bt
+    set $type = (enum Lisp_Type) (((*$bt->function).i >> gdb_valbits) & 0x7)
+    if $type == Lisp_Symbol
+      xprintsym (*$bt->function)
+    else
+      printf "0x%x ", (*$bt->function).i
+      if $type == Lisp_Vectorlike
+        set $size = ((struct Lisp_Vector *) (((*$bt->function).i & $valmask) | gdb_data_seg_bits))->size
+        output (enum pvec_type) (($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 signaled.
+end
+
+define xreload
+  set $valmask = ((long)1 << gdb_valbits) - 1
+  set $nonvalbits = gdb_emacs_intbits - gdb_valbits
+end
+document xreload
+  When starting Emacs a second time in the same gdb session under
+  FreeBSD 2.2.5, gdb 4.13, $valmask and $nonvalbits have lost
+  their values.  (The same happens on current (2000) versions of GNU/Linux
+  with gdb 5.0.)
+  This function reloads them.
+end
+
+define hook-run
+  xreload
+end
+
+# Call xreload if a new Emacs executable is loaded.
+define hookpost-run
+  xreload
+end
+
+set print pretty on
+set print sevenbit-strings
+
+# show environment DISPLAY
+# show environment TERM
+# set args -geometry 80x40+0+0
+
+# Don't let abort actually run, as it will make
+# stdio stop working and therefore the `pr' command above as well.
+# break abort
+
+# If we are running in synchronous mode, we want a chance to look around
+# before Emacs exits.  Perhaps we should put the break somewhere else
+# instead...
+# break x_error_quitter