Initial creation of sourceware repository

1 files changed, 0 insertions, 2607 deletions

diff --git a/gdb/gdba.el b/gdb/gdba.el
deleted file mode 100644
index 0f71586422..0000000000
--- a/gdb/gdba.el
+++ /dev/null
@@ -1,2607 +0,0 @@
-(defmacro gud (form)
-  (` (save-excursion (set-buffer "*gud-a.out*") (, form))))
-
-(defun dbug (foo &optional fun)
-  (save-excursion
-    (set-buffer (get-buffer-create "*trace*"))
-    (goto-char (point-max))
-    (insert "***" (symbol-name foo) "\n")
-    (if fun
-	(funcall fun))))
-
-
-;;; gud.el --- Grand Unified Debugger mode for gdb, sdb, dbx, or xdb
-;;;            under Emacs
-
-;; Author: Eric S. Raymond <esr@snark.thyrsus.com>
-;; Maintainer: FSF
-;; Version: 1.3
-;; Keywords: unix, tools
-
-;; Copyright (C) 1992, 1993 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; if not, write to the Free Software
-;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
-;;; Commentary:
-
-;; The ancestral gdb.el was by W. Schelter <wfs@rascal.ics.utexas.edu>
-;; It was later rewritten by rms.  Some ideas were due to Masanobu. 
-;; Grand Unification (sdb/dbx support) by Eric S. Raymond <esr@thyrsus.com>
-;; The overloading code was then rewritten by Barry Warsaw <bwarsaw@cen.com>,
-;; who also hacked the mode to use comint.el.  Shane Hartman <shane@spr.com>
-;; added support for xdb (HPUX debugger).
-
-;; Cygnus Support added support for gdb's --annotate=2.
-
-;;; Code:
-
-(require 'comint)
-(require 'etags)
-
-;; ======================================================================
-;; GUD commands must be visible in C buffers visited by GUD
-
-(defvar gud-key-prefix "\C-x\C-a"
-  "Prefix of all GUD commands valid in C buffers.")
-
-(global-set-key (concat gud-key-prefix "\C-l") 'gud-refresh)
-(global-set-key "\C-x " 'gud-break)	;; backward compatibility hack
-
-;; ======================================================================
-;; the overloading mechanism
-
-(defun gud-overload-functions (gud-overload-alist)
-  "Overload functions defined in GUD-OVERLOAD-ALIST.
-This association list has elements of the form
-     (ORIGINAL-FUNCTION-NAME  OVERLOAD-FUNCTION)"
-  (mapcar
-   (function (lambda (p) (fset (car p) (symbol-function (cdr p)))))
-   gud-overload-alist))
-
-(defun gud-massage-args (file args)
-  (error "GUD not properly entered."))
-
-(defun gud-marker-filter (str)
-  (error "GUD not properly entered."))
-
-(defun gud-find-file (f)
-  (error "GUD not properly entered."))
-
-;; ======================================================================
-;; command definition
-
-;; This macro is used below to define some basic debugger interface commands.
-;; Of course you may use `gud-def' with any other debugger command, including
-;; user defined ones.
-
-;; A macro call like (gud-def FUNC NAME KEY DOC) expands to a form
-;; which defines FUNC to send the command NAME to the debugger, gives
-;; it the docstring DOC, and binds that function to KEY in the GUD
-;; major mode.  The function is also bound in the global keymap with the
-;; GUD prefix.
-
-(defmacro gud-def (func cmd key &optional doc)
-  "Define FUNC to be a command sending STR and bound to KEY, with
-optional doc string DOC.  Certain %-escapes in the string arguments
-are interpreted specially if present.  These are:
-
-  %f	name (without directory) of current source file. 
-  %d	directory of current source file. 
-  %l	number of current source line
-  %e	text of the C lvalue or function-call expression surrounding point.
-  %a	text of the hexadecimal address surrounding point
-  %p	prefix argument to the command (if any) as a number
-
-  The `current' source file is the file of the current buffer (if
-we're in a C file) or the source file current at the last break or
-step (if we're in the GUD buffer).
-  The `current' line is that of the current buffer (if we're in a
-source file) or the source line number at the last break or step (if
-we're in the GUD buffer)."
-  (list 'progn
-	(list 'defun func '(arg)
-	      (or doc "")
-	      '(interactive "p")
-	      (list 'gud-call cmd 'arg))
-	(if key
-	    (list 'define-key
-		  '(current-local-map)
-		  (concat "\C-c" key)
-		  (list 'quote func)))
-	(if key
-	    (list 'global-set-key
-		  (list 'concat 'gud-key-prefix key)
-		  (list 'quote func)))))
-
-;; Where gud-display-frame should put the debugging arrow.  This is
-;; set by the marker-filter, which scans the debugger's output for
-;; indications of the current program counter.
-(defvar gud-last-frame nil)
-
-;; Used by gud-refresh, which should cause gud-display-frame to redisplay
-;; the last frame, even if it's been called before and gud-last-frame has
-;; been set to nil.
-(defvar gud-last-last-frame nil)
-
-;; All debugger-specific information is collected here.
-;; Here's how it works, in case you ever need to add a debugger to the mode.
-;;
-;; Each entry must define the following at startup:
-;;
-;;<name>
-;; comint-prompt-regexp
-;; gud-<name>-massage-args
-;; gud-<name>-marker-filter
-;; gud-<name>-find-file
-;;
-;; The job of the massage-args method is to modify the given list of
-;; debugger arguments before running the debugger.
-;;
-;; The job of the marker-filter method is to detect file/line markers in
-;; strings and set the global gud-last-frame to indicate what display
-;; action (if any) should be triggered by the marker.  Note that only
-;; whatever the method *returns* is displayed in the buffer; thus, you
-;; can filter the debugger's output, interpreting some and passing on
-;; the rest.
-;;
-;; The job of the find-file method is to visit and return the buffer indicated
-;; by the car of gud-tag-frame.  This may be a file name, a tag name, or
-;; something else.
-
-;; ======================================================================
-;; gdb functions
-
-;;; History of argument lists passed to gdb.
-(defvar gud-gdb-history nil)
-
-(defun gud-gdb-massage-args (file args)
-  (cons "--annotate=2" (cons file args)))
-
-
-;;
-;; In this world, there are gdb instance objects (of unspecified 
-;; representation) and buffers associated with those objects.
-;;
-
-;; 
-;; gdb-instance objects
-;; 
-
-(defun make-gdb-instance (proc)
-  "Create a gdb instance object from a gdb process."
-  (setq last-proc proc)
-  (let ((instance (cons 'gdb-instance proc)))
-    (save-excursion
-      (set-buffer (process-buffer proc))
-      (setq gdb-buffer-instance instance)
-      (progn
-	(mapcar 'make-variable-buffer-local gdb-instance-variables)
-	(setq gdb-buffer-type 'gud)
-	;; If we're taking over the buffer of another process,
-	;; take over it's ancillery buffers as well.
-	;;
-	(let ((dead (or old-gdb-buffer-instance)))
-	  (mapcar
-	   (function
-	    (lambda (b)
-	      (progn
-		(set-buffer b)
-		(if (eq dead gdb-buffer-instance)
-		    (setq gdb-buffer-instance instance)))))
-	     (buffer-list)))))
-    instance))
-
-(defun gdb-instance-process (inst) (cdr inst))
-
-;;; The list of instance variables is built up by the expansions of
-;;; DEF-GDB-VARIABLE
-;;;
-(defvar gdb-instance-variables '()
-  "A list of variables that are local to the gud buffer associated
-with a gdb instance.") 
-
-(defmacro def-gdb-variable
-  (name accessor setter &optional default doc)
-  (`
-   (progn
-     (defvar (, name) (, default) (, (or doc "undocumented")))
-     (if (not (memq '(, name) gdb-instance-variables))
-	 (setq gdb-instance-variables
-	       (cons '(, name) gdb-instance-variables)))
-     (, (and accessor
-	     (`
-	      (defun (, accessor) (instance)
-		(let
-		    ((buffer (gdb-get-instance-buffer instance 'gud)))
-		  (and buffer
-		       (save-excursion
-			 (set-buffer buffer)
-			 (, name))))))))
-     (, (and setter
-	     (`
-	      (defun (, setter) (instance val)
-		(let
-		    ((buffer (gdb-get-instance-buffer instance 'gud)))
-		  (and buffer
-		       (save-excursion
-			 (set-buffer buffer)
-			 (setq (, name) val)))))))))))
-
-(defmacro def-gdb-var (root-symbol &optional default doc)
-  (let* ((root (symbol-name root-symbol))
-	 (accessor (intern (concat "gdb-instance-" root)))
-	 (setter (intern (concat "set-gdb-instance-" root)))
-	 (var-name (intern (concat "gdb-" root))))
-    (` (def-gdb-variable
-	 (, var-name) (, accessor) (, setter)
-	 (, default) (, doc)))))
-
-(def-gdb-var buffer-instance nil
-  "In an instance buffer, the buffer's instance.")
-
-(def-gdb-var buffer-type nil
-  "One of the symbols bound in gdb-instance-buffer-rules")
-
-(def-gdb-var burst ""
-  "A string of characters from gdb that have not yet been processed.")
-
-(def-gdb-var input-queue ()
-  "A list of high priority gdb command objects.")
-
-(def-gdb-var idle-input-queue ()
-  "A list of low priority gdb command objects.")
-
-(def-gdb-var prompting nil
-  "True when gdb is idle with no pending input.")
-
-(def-gdb-var output-sink 'user
-  "The disposition of the output of the current gdb command.
-Possible values are these symbols:
-
-    user -- gdb output should be copied to the gud buffer 
-            for the user to see.
-
-    inferior -- gdb output should be copied to the inferior-io buffer
-
-    pre-emacs -- output should be ignored util the post-prompt
-                 annotation is received.  Then the output-sink
-		 becomes:...
-    emacs -- output should be collected in the partial-output-buffer
-	     for subsequent processing by a command.  This is the
-	     disposition of output generated by commands that
-	     gud mode sends to gdb on its own behalf.
-    post-emacs -- ignore input until the prompt annotation is 
-		  received, then go to USER disposition.
-")
-
-(def-gdb-var current-item nil
-  "The most recent command item sent to gdb.")
-
-(def-gdb-var pending-triggers '()
-  "A list of trigger functions that have run later than their output
-handlers.")
-
-(defun in-gdb-instance-context (instance form)
-  "Funcall `form' in the gud buffer of `instance'"
-  (save-excursion
-    (set-buffer (gdb-get-instance-buffer instance 'gud))
-    (funcall form)))
-
-;; end of instance vars
-
-;;
-;; finding instances
-;;
-
-(defun gdb-proc->instance (proc)
-  (save-excursion
-    (set-buffer (process-buffer proc))
-    gdb-buffer-instance))
-
-(defun gdb-mru-instance-buffer ()
-  "Return the most recently used (non-auxiliary) gdb gud buffer."
-  (save-excursion
-    (gdb-goto-first-gdb-instance (buffer-list))))
-
-(defun gdb-goto-first-gdb-instance (blist)
-  "Use gdb-mru-instance-buffer -- not this."
-  (and blist
-       (progn
-	 (set-buffer (car blist))
-	 (or (and gdb-buffer-instance
-		  (eq gdb-buffer-type 'gud)
-		  (car blist))
-	     (gdb-goto-first-gdb-instance (cdr blist))))))
-
-(defun buffer-gdb-instance (buf)
-  (save-excursion
-    (set-buffer buf)
-    gdb-buffer-instance))
-
-(defun gdb-needed-default-instance ()
-  "Return the most recently used gdb instance or signal an error."
-  (let ((buffer (gdb-mru-instance-buffer)))
-    (or (and buffer (buffer-gdb-instance buffer))
-	(error "No instance of gdb found."))))
-
-(defun gdb-instance-target-string (instance)
-  "The apparent name of the program being debugged by a gdb instance.
-For sure this the root string used in smashing together the gud 
-buffer's name, even if that doesn't happen to be the name of a 
-program."
-  (in-gdb-instance-context
-   instance
-   (function (lambda () gud-target-name))))
-
-
-
-;;
-;; Instance Buffers.
-;;
-
-;; More than one buffer can be associated with a gdb instance.
-;;
-;; Each buffer has a TYPE -- a symbol that identifies the function
-;; of that particular buffer.
-;;
-;; The usual gud interaction buffer is given the type `gud' and
-;; is constructed specially.  
-;;
-;; Others are constructed by gdb-get-create-instance-buffer and 
-;; named according to the rules set forth in the gdb-instance-buffer-rules-assoc
-
-(defun gdb-get-instance-buffer (instance key)
-  "Return the instance buffer for `instance' tagged with type `key'.
-The key should be one of the cars in `gdb-instance-buffer-rules-assoc'."
-  (save-excursion
-    (gdb-look-for-tagged-buffer instance key (buffer-list))))
-
-(defun gdb-get-create-instance-buffer (instance key)
-  "Create a new gdb instance buffer of the type specified by `key'.
-The key should be one of the cars in `gdb-instance-buffer-rules-assoc'."
-  (or (gdb-get-instance-buffer instance key)
-      (let* ((rules (assoc key gdb-instance-buffer-rules-assoc))
-	     (name (funcall (gdb-rules-name-maker rules) instance))
-	     (new (get-buffer-create name)))
-	(save-excursion
-	  (set-buffer new)
-	  (make-variable-buffer-local 'gdb-buffer-type)
-	  (setq gdb-buffer-type key)
-	  (make-variable-buffer-local 'gdb-buffer-instance)
-	  (setq gdb-buffer-instance instance)
-	  (if (cdr (cdr rules))
-	      (funcall (car (cdr (cdr rules)))))
-	  new))))
-
-(defun gdb-rules-name-maker (rules) (car (cdr rules)))
-
-(defun gdb-look-for-tagged-buffer (instance key bufs)
-  (let ((retval nil))
-    (while (and (not retval) bufs)
-      (set-buffer (car bufs))
-      (if (and (eq gdb-buffer-instance instance)
-	       (eq gdb-buffer-type key))
-	  (setq retval (car bufs)))
-      (setq bufs (cdr bufs))
-      )
-    retval))
-
-(defun gdb-instance-buffer-p (buf)
-  (save-excursion
-    (set-buffer buf)
-    (and gdb-buffer-type
-	 (not (eq gdb-buffer-type 'gud)))))
-
-;;
-;; This assoc maps buffer type symbols to rules.  Each rule is a list of
-;; at least one and possible more functions.  The functions have these
-;; roles in defining a buffer type:
-;;
-;;     NAME - take an instance, return a name for this type buffer for that 
-;;	      instance.
-;; The remaining function(s) are optional:
-;;
-;;     MODE - called in new new buffer with no arguments, should establish
-;;	      the proper mode for the buffer.
-;;
-
-(defvar gdb-instance-buffer-rules-assoc '())
-
-(defun gdb-set-instance-buffer-rules (buffer-type &rest rules)
-  (let ((binding (assoc buffer-type gdb-instance-buffer-rules-assoc)))
-    (if binding
-	(setcdr binding rules)
-      (setq gdb-instance-buffer-rules-assoc
-	    (cons (cons buffer-type rules)
-		  gdb-instance-buffer-rules-assoc)))))
-
-(gdb-set-instance-buffer-rules 'gud 'error) ; gud buffers are an exception to the rules
-
-;;
-;; partial-output buffers
-;;
-;; These accumulate output from a command executed on
-;; behalf of emacs (rather than the user).  
-;;
-
-(gdb-set-instance-buffer-rules 'gdb-partial-output-buffer
-			       'gdb-partial-output-name)
-
-(defun gdb-partial-output-name (instance)
-  (concat "*partial-output-"
-	  (gdb-instance-target-string instance)
-	  "*"))
-
-
-(gdb-set-instance-buffer-rules 'gdb-inferior-io
-			       'gdb-inferior-io-name
-			       'gud-inferior-io-mode)
-
-(defun gdb-inferior-io-name (instance)
-  (concat "*input/output of "
-	  (gdb-instance-target-string instance)
-	  "*"))
-
-(defvar gdb-inferior-io-mode-map (copy-keymap comint-mode-map))
-(define-key comint-mode-map "\C-c\C-c" 'gdb-inferior-io-interrupt)
-(define-key comint-mode-map "\C-c\C-z" 'gdb-inferior-io-stop)
-(define-key comint-mode-map "\C-c\C-\\" 'gdb-inferior-io-quit)
-(define-key comint-mode-map "\C-c\C-d" 'gdb-inferior-io-eof)
-
-(defun gud-inferior-io-mode ()
-  "Major mode for gud inferior-io.
-
-\\{comint-mode-map}"
-  ;; We want to use comint because it has various nifty and familiar
-  ;; features.  We don't need a process, but comint wants one, so create
-  ;; a dummy one.
-  (make-comint (substring (buffer-name) 1 (- (length (buffer-name)) 1))
-	       "/bin/cat")
-  (setq major-mode 'gud-inferior-io-mode)
-  (setq mode-name "Debuggee I/O")
-  (setq comint-input-sender 'gud-inferior-io-sender)
-)
-
-(defun gud-inferior-io-sender (proc string)
-  (save-excursion
-    (set-buffer (process-buffer proc))
-    (let ((instance gdb-buffer-instance))
-      (set-buffer (gdb-get-instance-buffer instance 'gud))
-      (let ((gud-proc (get-buffer-process (current-buffer))))
-	(process-send-string gud-proc string)
-	(process-send-string gud-proc "\n")
-    ))
-    ))
-
-(defun gdb-inferior-io-interrupt (instance)
-  "Interrupt the program being debugged."
-  (interactive (list (gdb-needed-default-instance)))
-  (interrupt-process
-   (get-buffer-process (gdb-get-instance-buffer instance 'gud)) comint-ptyp))
-
-(defun gdb-inferior-io-quit (instance)
-  "Send quit signal to the program being debugged."
-  (interactive (list (gdb-needed-default-instance)))
-  (quit-process
-   (get-buffer-process (gdb-get-instance-buffer instance 'gud)) comint-ptyp))
-
-(defun gdb-inferior-io-stop (instance)
-  "Stop the program being debugged."
-  (interactive (list (gdb-needed-default-instance)))
-  (stop-process
-   (get-buffer-process (gdb-get-instance-buffer instance 'gud)) comint-ptyp))
-
-(defun gdb-inferior-io-eof (instance)
-  "Send end-of-file to the program being debugged."
-  (interactive (list (gdb-needed-default-instance)))
-  (process-send-eof
-   (get-buffer-process (gdb-get-instance-buffer instance 'gud))))
-
-
-;;
-;; gdb communications
-;;
-
-;; INPUT: things sent to gdb
-;;
-;; Each instance has a high and low priority 
-;; input queue.  Low priority input is sent only 
-;; when the high priority queue is idle.
-;;
-;; The queues are lists.  Each element is either 
-;; a string (indicating user or user-like input)
-;; or a list of the form:
-;;
-;;    (INPUT-STRING  HANDLER-FN)
-;;
-;;
-;; The handler function will be called from the 
-;; partial-output buffer when the command completes.
-;; This is the way to write commands which 
-;; invoke gdb commands autonomously.
-;;
-;; These lists are consumed tail first.
-;;
-
-(defun gdb-send (proc string)
-  "A comint send filter for gdb.
-This filter may simply queue output for a later time."
-  (let ((instance (gdb-proc->instance proc)))
-    (gdb-instance-enqueue-input instance (concat string "\n"))))
-
-;; Note: Stuff enqueued here will be sent to the next prompt, even if it
-;; is a query, or other non-top-level prompt.  To guarantee stuff will get
-;; sent to the top-level prompt, currently it must be put in the idle queue.
-;;				 ^^^^^^^^^
-;; [This should encourage gud extentions that invoke gdb commands to let
-;;  the user go first; it is not a bug.     -t]
-;;
-
-(defun gdb-instance-enqueue-input (instance item)
-  (if (gdb-instance-prompting instance)
-      (progn
-	(gdb-send-item instance item)
-	(set-gdb-instance-prompting instance nil))
-    (set-gdb-instance-input-queue
-     instance
-     (cons item (gdb-instance-input-queue instance)))))
-
-(defun gdb-instance-dequeue-input (instance)
-  (let ((queue (gdb-instance-input-queue instance)))
-    (and queue
-       (if (not (cdr queue))
-	   (let ((answer (car queue)))
-	     (set-gdb-instance-input-queue instance '())
-	     answer)
-	 (gdb-take-last-elt queue)))))
-
-(defun gdb-instance-enqueue-idle-input (instance item)
-  (if (and (gdb-instance-prompting instance)
-	   (not (gdb-instance-input-queue instance)))
-      (progn
-	(gdb-send-item instance item)
-	(set-gdb-instance-prompting instance nil))
-    (set-gdb-instance-idle-input-queue
-     instance
-     (cons item (gdb-instance-idle-input-queue instance)))))
-
-(defun gdb-instance-dequeue-idle-input (instance)
-  (let ((queue (gdb-instance-idle-input-queue instance)))
-    (and queue
-       (if (not (cdr queue))
-	   (let ((answer (car queue)))
-	     (set-gdb-instance-idle-input-queue instance '())
-	     answer)
-	 (gdb-take-last-elt queue)))))
-
-; Don't use this in general.
-(defun gdb-take-last-elt (l)
-  (if (cdr (cdr l))
-      (gdb-take-last-elt (cdr l))
-    (let ((answer (car (cdr l))))
-      (setcdr l '())
-      answer)))
-
-
-;;
-;; output -- things gdb prints to emacs
-;;
-;; GDB output is a stream interrupted by annotations.
-;; Annotations can be recognized by their beginning
-;; with \C-j\C-z\C-z<tag><opt>\C-j
-;;
-;; The tag is a string obeying symbol syntax.
-;;
-;; The optional part `<opt>' can be either the empty string
-;; or a space followed by more data relating to the annotation.
-;; For example, the SOURCE annotation is followed by a filename,
-;; line number and various useless goo.  This data must not include
-;; any newlines.
-;;
-
-
-(defun gud-gdb-marker-filter (string)
-  "A gud marker filter for gdb."
-  ;; Bogons don't tell us the process except through scoping crud.
-  (let ((instance (gdb-proc->instance proc)))
-    (gdb-output-burst instance string)))
-
-(defvar gdb-annotation-rules
-  '(("frames-invalid" gdb-invalidate-frames)
-    ("breakpoints-invalid" gdb-invalidate-breakpoints)
-    ("pre-prompt" gdb-pre-prompt)
-    ("prompt" gdb-prompt)
-    ("commands" gdb-subprompt)
-    ("overload-choice" gdb-subprompt)
-    ("query" gdb-subprompt)
-    ("prompt-for-continue" gdb-subprompt)
-    ("post-prompt" gdb-post-prompt)
-    ("source" gdb-source)
-    ("starting" gdb-starting)
-    ("exited" gdb-stopping)
-    ("signalled" gdb-stopping)
-    ("signal" gdb-stopping)
-    ("breakpoint" gdb-stopping)
-    ("watchpoint" gdb-stopping)
-    ("stopped" gdb-stopped)
-    )
-  "An assoc mapping annotation tags to functions which process them.")
-
-
-(defun gdb-ignore-annotation (instance args)
-  nil)
-
-(defconst gdb-source-spec-regexp
-  "\\(.*\\):\\([0-9]*\\):[0-9]*:[a-z]*:0x[a-f0-9]*")
-
-;; Do not use this except as an annotation handler."
-(defun gdb-source (instance args)
-  (string-match gdb-source-spec-regexp args)
-  ;; Extract the frame position from the marker.
-  (setq gud-last-frame
-	(cons
-	 (substring args (match-beginning 1) (match-end 1))
-	 (string-to-int (substring args
-				   (match-beginning 2)
-				   (match-end 2))))))
-
-;; An annotation handler for `prompt'.
-;; This sends the next command (if any) to gdb.
-(defun gdb-prompt (instance ignored)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'user) t)
-     ((eq sink 'post-emacs)
-      (set-gdb-instance-output-sink instance 'user))
-     (t
-      (set-gdb-instance-output-sink instance 'user)
-      (error "Phase error in gdb-prompt (got %s)" sink))))
-  (let ((highest (gdb-instance-dequeue-input instance)))
-    (if highest
-	(gdb-send-item instance highest)
-      (let ((lowest (gdb-instance-dequeue-idle-input instance)))
-	(if lowest
-	    (gdb-send-item instance lowest)
-	  (progn
-	    (set-gdb-instance-prompting instance t)
-	    (gud-display-frame)))))))
-
-;; An annotation handler for non-top-level prompts.
-(defun gdb-subprompt (instance ignored)
-  (let ((highest (gdb-instance-dequeue-input instance)))
-    (if highest
-	(gdb-send-item instance highest)
-      (set-gdb-instance-prompting instance t))))
-
-(defun gdb-send-item (instance item)
-  (set-gdb-instance-current-item instance item)
-  (if (stringp item)
-      (progn
-	(set-gdb-instance-output-sink instance 'user)
-	(process-send-string (gdb-instance-process instance)
-			     item))
-    (progn
-      (gdb-clear-partial-output instance)
-      (set-gdb-instance-output-sink instance 'pre-emacs)
-      (process-send-string (gdb-instance-process instance)
-			   (car item)))))
-
-;; An annotation handler for `pre-prompt'.
-;; This terminates the collection of output from a previous
-;; command if that happens to be in effect.
-(defun gdb-pre-prompt (instance ignored)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'user) t)
-     ((eq sink 'emacs)
-      (set-gdb-instance-output-sink instance 'post-emacs)
-      (let ((handler
-	     (car (cdr (gdb-instance-current-item instance)))))
-	(save-excursion
-	  (set-buffer (gdb-get-create-instance-buffer
-		       instance 'gdb-partial-output-buffer))
-	  (funcall handler))))
-     (t
-      (set-gdb-instance-output-sink instance 'user)
-      (error "Output sink phase error 1.")))))
-
-;; An annotation handler for `starting'.  This says that I/O for the subprocess
-;; is now the program being debugged, not GDB.
-(defun gdb-starting (instance ignored)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'user)
-      (set-gdb-instance-output-sink instance 'inferior)
-      ;; FIXME: need to send queued input
-      )
-     (t (error "Unexpected `starting' annotation")))))
-
-;; An annotation handler for `exited' and other annotations which say that
-;; I/O for the subprocess is now GDB, not the program being debugged.
-(defun gdb-stopping (instance ignored)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'inferior)
-      (set-gdb-instance-output-sink instance 'user)
-      )
-     (t (error "Unexpected stopping annotation")))))
-
-;; An annotation handler for `stopped'.  It is just like gdb-stopping, except
-;; that if we already set the output sink to 'user in gdb-stopping, that is 
-;; fine.
-(defun gdb-stopped (instance ignored)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'inferior)
-      (set-gdb-instance-output-sink instance 'user)
-      )
-     ((eq sink 'user)
-      t)
-     (t (error "Unexpected stopping annotation")))))
-
-;; An annotation handler for `post-prompt'.
-;; This begins the collection of output from the current
-;; command if that happens to be appropriate."
-(defun gdb-post-prompt (instance ignored)
-  (gdb-invalidate-registers instance ignored)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'user) t)
-     ((eq sink 'pre-emacs)
-      (set-gdb-instance-output-sink instance 'emacs))
-
-     (t
-      (set-gdb-instance-output-sink instance 'user)
-      (error "Output sink phase error 3.")))))
-
-;; Handle a burst of output from a gdb instance.
-;; This function is (indirectly) used as a gud-marker-filter.
-;; It must return output (if any) to be insterted in the gud 
-;; buffer.
-
-(defun gdb-output-burst (instance string)
-  "Handle a burst of output from a gdb instance.
-This function is (indirectly) used as a gud-marker-filter.
-It must return output (if any) to be insterted in the gud 
-buffer."
-
-  (save-match-data
-    (let (
-	  ;; Recall the left over burst from last time
-	  (burst (concat (gdb-instance-burst instance) string))
-	  ;; Start accumulating output for the gud buffer
-	  (output ""))
-
-      ;; Process all the complete markers in this chunk.
-
-      (while (string-match "\n\032\032\\(.*\\)\n" burst)
-	(let ((annotation (substring burst
-				     (match-beginning 1)
-				     (match-end 1))))
-	    
-	  ;; Stuff prior to the match is just ordinary output.
-	  ;; It is either concatenated to OUTPUT or directed
-	  ;; elsewhere.
-	  (setq output
-		(gdb-concat-output
-		 instance
-		 output
-		 (substring burst 0 (match-beginning 0))))
-
-	  ;; Take that stuff off the burst.
-	  (setq burst (substring burst (match-end 0)))
-	    
-	  ;; Parse the tag from the annotation, and maybe its arguments.
-	  (string-match "\\(\\S-*\\) ?\\(.*\\)" annotation)
-	  (let* ((annotation-type (substring annotation
-					     (match-beginning 1)
-					     (match-end 1)))
-		 (annotation-arguments (substring annotation
-						  (match-beginning 2)
-						  (match-end 2)))
-		 (annotation-rule (assoc annotation-type
-					 gdb-annotation-rules)))
-	    ;; Call the handler for this annotation.
-	    (if annotation-rule
-		(funcall (car (cdr annotation-rule))
-			 instance
-			 annotation-arguments)
-	      ;; Else the annotation is not recognized.  Ignore it silently,
-	      ;; so that GDB can add new annotations without causing
-	      ;; us to blow up.
-	      ))))
-
-
-      ;; Does the remaining text end in a partial line?
-      ;; If it does, then keep part of the burst until we get more.
-      (if (string-match "\n\\'\\|\n\032\\'\\|\n\032\032.*\\'"
-			burst)
-	  (progn
-	    ;; Everything before the potential marker start can be output.
-	    (setq output
-		  (gdb-concat-output
-		   instance
-		   output
-		   (substring burst 0 (match-beginning 0))))
-
-	    ;; Everything after, we save, to combine with later input.
-	    (setq burst (substring burst (match-beginning 0))))
-
-	;; In case we know the burst contains no partial annotations:
-	(progn
-	  (setq output (gdb-concat-output instance output burst))
-	  (setq burst "")))
-
-      ;; Save the remaining burst for the next call to this function.
-      (set-gdb-instance-burst instance burst)
-      output)))
-
-(defun gdb-concat-output (instance so-far new)
-  (let ((sink (gdb-instance-output-sink instance)))
-    (cond
-     ((eq sink 'user) (concat so-far new))
-     ((or (eq sink 'pre-emacs) (eq sink 'post-emacs)) so-far)
-     ((eq sink 'emacs)
-      (gdb-append-to-partial-output instance new)
-      so-far)
-     ((eq sink 'inferior)
-      (gdb-append-to-inferior-io instance new)
-      so-far)
-     (t (error "Bogon output sink %S" sink)))))
-
-(defun gdb-append-to-partial-output (instance string)
-  (save-excursion
-    (set-buffer
-     (gdb-get-create-instance-buffer
-      instance 'gdb-partial-output-buffer))
-    (goto-char (point-max))
-    (insert string)))
-
-(defun gdb-clear-partial-output (instance)
-  (save-excursion
-    (set-buffer
-     (gdb-get-create-instance-buffer
-      instance 'gdb-partial-output-buffer))
-    (delete-region (point-min) (point-max))))
-
-(defun gdb-append-to-inferior-io (instance string)
-  (save-excursion
-    (set-buffer
-     (gdb-get-create-instance-buffer
-      instance 'gdb-inferior-io))
-    (goto-char (point-max))
-    (insert-before-markers string))
-  (gud-display-buffer
-   (gdb-get-create-instance-buffer instance
-				   'gdb-inferior-io)))
-
-(defun gdb-clear-inferior-io (instance)
-  (save-excursion
-    (set-buffer
-     (gdb-get-create-instance-buffer
-      instance 'gdb-inferior-io))
-    (delete-region (point-min) (point-max))))
-
-
-
-;; One trick is to have a command who's output is always available in
-;; a buffer of it's own, and is always up to date.  We build several 
-;; buffers of this type.
-;;
-;; There are two aspects to this: gdb has to tell us when the output
-;; for that command might have changed, and we have to be able to run
-;; the command behind the user's back.
-;;
-;; The idle input queue and the output phasing associated with 
-;; the instance variable `(gdb-instance-output-sink instance)' help
-;; us to run commands behind the user's back.
-;; 
-;; Below is the code for specificly managing buffers of output from one 
-;; command.
-;;
-
-
-;; The trigger function is suitable for use in the assoc GDB-ANNOTATION-RULES
-;; It adds an idle input for the command we are tracking.  It should be the
-;; annotation rule binding of whatever gdb sends to tell us this command
-;; might have changed it's output.
-;;
-;; NAME is the fucntion name.  DEMAND-PREDICATE tests if output is really needed.
-;; GDB-COMMAND is a string of such.  OUTPUT-HANDLER is the function bound to the
-;; input in the input queue (see comment about ``gdb communications'' above).
-(defmacro def-gdb-auto-update-trigger (name demand-predicate gdb-command output-handler)
-  (`
-   (defun (, name) (instance &optional ignored)
-     (if (and ((, demand-predicate) instance)
-	      (not (member '(, name)
-			   (gdb-instance-pending-triggers instance))))
-	 (progn
-	   (gdb-instance-enqueue-idle-input
-	    instance
-	    (list (, gdb-command) '(, output-handler)))
-	   (set-gdb-instance-pending-triggers
-	    instance
-	    (cons '(, name)
-		  (gdb-instance-pending-triggers instance))))))))
-		
-(defmacro def-gdb-auto-update-handler (name trigger buf-key)
-  (`
-   (defun (, name) ()
-     (set-gdb-instance-pending-triggers
-      instance
-      (delq '(, trigger)
-	    (gdb-instance-pending-triggers instance)))
-     (let ((buf (gdb-get-instance-buffer instance
-					  '(, buf-key))))
-       (and buf
-	    (save-excursion
-	      (set-buffer buf)
-	      (let ((p (point))
-		    (buffer-read-only nil))
-		(delete-region (point-min) (point-max))
-		(insert-buffer (gdb-get-create-instance-buffer
-				instance
-				'gdb-partial-output-buffer))
-		(goto-char p))))))))
-
-(defmacro def-gdb-auto-updated-buffer
-  (buffer-key trigger-name gdb-command output-handler-name)
-  (`
-   (progn
-     (def-gdb-auto-update-trigger (, trigger-name)
-       ;; The demand predicate:
-       (lambda (instance)
-	 (gdb-get-instance-buffer instance '(, buffer-key)))
-       (, gdb-command)
-       (, output-handler-name))
-     (def-gdb-auto-update-handler (, output-handler-name)
-       (, trigger-name) (, buffer-key)))))
-
-
-
-;;
-;; Breakpoint buffers
-;; 
-;; These display the output of `info breakpoints'.
-;;
-
-       
-(gdb-set-instance-buffer-rules 'gdb-breakpoints-buffer
-			       'gdb-breakpoints-buffer-name
-			       'gud-breakpoints-mode)
-
-(def-gdb-auto-updated-buffer gdb-breakpoints-buffer
-  ;; This defines the auto update rule for buffers of type
-  ;; `gdb-breakpoints-buffer'.
-  ;;
-  ;; It defines a function to serve as the annotation handler that
-  ;; handles the `foo-invalidated' message.  That function is called:
-  gdb-invalidate-breakpoints
-
-  ;; To update the buffer, this command is sent to gdb.
-  "server info breakpoints\n"
-
-  ;; This also defines a function to be the handler for the output
-  ;; from the command above.  That function will copy the output into
-  ;; the appropriately typed buffer.  That function will be called:
-  gdb-info-breakpoints-handler)
-
-(defun gdb-breakpoints-buffer-name (instance)
-  (save-excursion
-    (set-buffer (process-buffer (gdb-instance-process instance)))
-    (concat "*breakpoints of " (gdb-instance-target-string instance) "*")))
-
-(defun gud-display-breakpoints-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-display-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-breakpoints-buffer)))
-
-(defun gud-frame-breakpoints-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-frame-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-breakpoints-buffer)))
-
-(defvar gud-breakpoints-mode-map nil)
-(setq gud-breakpoints-mode-map (make-keymap))
-(suppress-keymap gud-breakpoints-mode-map)
-(define-key gud-breakpoints-mode-map " " 'gud-toggle-bp-this-line)
-(define-key gud-breakpoints-mode-map "d" 'gud-delete-bp-this-line)
-
-(defun gud-breakpoints-mode ()
-  "Major mode for gud breakpoints.
-
-\\{gud-breakpoints-mode-map}"
-  (setq major-mode 'gud-breakpoints-mode)
-  (setq mode-name "Breakpoints")
-  (use-local-map gud-breakpoints-mode-map)
-  (setq buffer-read-only t)
-  (gdb-invalidate-breakpoints gdb-buffer-instance))
-
-(defun gud-toggle-bp-this-line ()
-  (interactive)
-  (save-excursion
-    (beginning-of-line 1)
-    (if (not (looking-at "\\([0-9]*\\)\\s-*\\S-*\\s-*\\S-*\\s-*\\(.\\)"))
-	(error "Not recognized as breakpoint line (demo foo).")
-      (gdb-instance-enqueue-idle-input
-       gdb-buffer-instance
-       (list
-	(concat
-	 (if (eq ?y (char-after (match-beginning 2)))
-	     "server disable "
-	   "server enable ")
-	 (buffer-substring (match-beginning 0)
-			   (match-end 1))
-	 "\n")
-	'(lambda () nil)))
-      )))
-
-(defun gud-delete-bp-this-line ()
-  (interactive)
-  (save-excursion
-    (beginning-of-line 1)
-    (if (not (looking-at "\\([0-9]*\\)\\s-*\\S-*\\s-*\\S-*\\s-*\\(.\\)"))
-	(error "Not recognized as breakpoint line (demo foo).")
-      (gdb-instance-enqueue-idle-input
-       gdb-buffer-instance
-       (list
-	(concat
-	 "server delete "
-	 (buffer-substring (match-beginning 0)
-			   (match-end 1))
-	 "\n")
-	'(lambda () nil)))
-      )))
-
-
-
-
-;;
-;; Frames buffers.  These display a perpetually correct bactracktrace
-;; (from the command `where').
-;;
-;; Alas, if your stack is deep, they are costly.
-;;
-
-(gdb-set-instance-buffer-rules 'gdb-stack-buffer
-			       'gdb-stack-buffer-name
-			       'gud-frames-mode)
-
-(def-gdb-auto-updated-buffer gdb-stack-buffer
-  gdb-invalidate-frames
-  "server where\n"
-  gdb-info-frames-handler)
-
-(defun gdb-stack-buffer-name (instance)
-  (save-excursion
-    (set-buffer (process-buffer (gdb-instance-process instance)))
-    (concat "*stack frames of "
-	    (gdb-instance-target-string instance) "*")))
-
-(defun gud-display-stack-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-display-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-stack-buffer)))
-
-(defun gud-frame-stack-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-frame-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-stack-buffer)))
-
-(defvar gud-frames-mode-map nil)
-(setq gud-frames-mode-map (make-keymap))
-(suppress-keymap gud-frames-mode-map)
-(define-key gud-frames-mode-map [mouse-2]
-  'gud-frames-select-by-mouse)
-
-(defun gud-frames-mode ()
-  "Major mode for gud frames.
-
-\\{gud-frames-mode-map}"
-  (setq major-mode 'gud-frames-mode)
-  (setq mode-name "Frames")
-  (setq buffer-read-only t)
-  (use-local-map gud-frames-mode-map)
-  (gdb-invalidate-frames gdb-buffer-instance))
-
-(defun gud-get-frame-number ()
-  (save-excursion
-    (let* ((pos (re-search-backward "^#\\([0-9]*\\)" nil t))
-	   (n (or (and pos
-		       (string-to-int
-			(buffer-substring (match-beginning 1)
-					  (match-end 1))))
-		  0)))
-      n)))
-
-(defun gud-frames-select-by-mouse (e)
-  (interactive "e")
-  (let (selection)
-    (save-excursion
-      (set-buffer (window-buffer (posn-window (event-end e))))
-      (save-excursion
-	(goto-char (posn-point (event-end e)))
-	(setq selection (gud-get-frame-number))))
-    (select-window (posn-window (event-end e)))
-    (save-excursion
-      (set-buffer (gdb-get-instance-buffer (gdb-needed-default-instance) 'gud))
-      (gud-call "fr %p" selection)
-      (gud-display-frame))))
-
-
-;;
-;; Registers buffers
-;;
-
-(def-gdb-auto-updated-buffer gdb-registers-buffer
-  gdb-invalidate-registers
-  "server info registers\n"
-  gdb-info-registers-handler)
-
-(gdb-set-instance-buffer-rules 'gdb-registers-buffer
-			       'gdb-registers-buffer-name
-			       'gud-registers-mode)
-
-(defvar gud-registers-mode-map nil)
-(setq gud-registers-mode-map (make-keymap))
-(suppress-keymap gud-registers-mode-map)
-
-(defun gud-registers-mode ()
-  "Major mode for gud registers.
-
-\\{gud-registers-mode-map}"
-  (setq major-mode 'gud-registers-mode)
-  (setq mode-name "Registers")
-  (setq buffer-read-only t)
-  (use-local-map gud-registers-mode-map)
-  (gdb-invalidate-registers gdb-buffer-instance))
-
-(defun gdb-registers-buffer-name (instance)
-  (save-excursion
-    (set-buffer (process-buffer (gdb-instance-process instance)))
-    (concat "*registers of " (gdb-instance-target-string instance) "*")))
-
-(defun gud-display-registers-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-display-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-registers-buffer)))
-
-(defun gud-frame-registers-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-frame-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-registers-buffer)))
-
-
-
-;;;; Menu windows:
-
-
-;; MENU-LIST is ((option option option...) (option option ...)...)
-;; 
-(defun gud-display-menu (menu-list)
-  (setq fill-column (min 120 (- (window-width)
-				(min 8 (window-width)))))
-  (while menu-list
-    (mapcar (function (lambda (x) (insert (symbol-name x) " "))) (car menu-list))
-    (fill-paragraph nil)
-    (insert "\n\n")
-    (setq menu-list (cdr menu-list)))
-  (goto-char (point-min))
-  (while (re-search-forward "\\([^ \n]+\\)\\(\n\\| \\)" nil t)
-    (put-text-property (match-beginning 1) (match-end 1)
-		       'mouse-face 'highlight))
-  (goto-char (point-min)))
-
-(defun gud-goto-menu (menu)
-  (setq gud-menu-position menu)
-  (let ((buffer-read-only nil))
-    (delete-region (point-min) (point-max))
-    (gud-display-menu menu)))
-
-(defun gud-menu-pick (event)
-  "Choose an item from a gdb command menu."
-  (interactive "e")
-  (let (choice)
-    (save-excursion
-      (set-buffer (window-buffer (posn-window (event-start event))))
-      (goto-char (posn-point (event-start event)))
-      (let (beg end)
-	(skip-chars-forward "^ \t\n")
-	(setq end (point))
-	(skip-chars-backward "^ \t\n")
-	(setq beg (point))
-	(setq choice (buffer-substring beg end))
-	(message choice)
-	(gud-invoke-menu (intern choice))))))
-
-(defun gud-invoke-menu (symbol)
-  (let ((meaning (assoc symbol gud-menu-rules)))
-    (cond
-     ((and (consp meaning)
-	   (consp (car (cdr meaning))))
-      (gud-goto-menu (car (cdr meaning))))
-     (meaning (call-interactively (car (cdr meaning)))))))
-
-
-
-(gdb-set-instance-buffer-rules 'gdb-command-buffer
-			       'gdb-command-buffer-name
-			       'gud-command-mode)
-
-(defvar gud-command-mode-map nil)
-(setq gud-command-mode-map (make-keymap))
-(suppress-keymap gud-command-mode-map)
-(define-key gud-command-mode-map [mouse-2] 'gud-menu-pick)
-
-(defun gud-command-mode ()
-  "Major mode for gud menu.
-
-\\{gud-command-mode-map}" (interactive) (setq major-mode 'gud-command-mode)
-  (setq mode-name "Menu") (setq buffer-read-only t) (use-local-map
-  gud-command-mode-map) (make-variable-buffer-local 'gud-menu-position)
-  (if (not gud-menu-position) (gud-goto-menu gud-running-menu)))
-
-(defun gdb-command-buffer-name (instance)
-  (save-excursion
-    (set-buffer (process-buffer (gdb-instance-process instance)))
-    (concat "*menu of " (gdb-instance-target-string instance) "*")))
-
-(defun gud-display-command-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-display-buffer
-   (gdb-get-create-instance-buffer instance
-				   'gdb-command-buffer)
-   6))
-
-(defun gud-frame-command-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-frame-buffer
-   (gdb-get-create-instance-buffer instance
-				    'gdb-command-buffer)))
-
-(defvar gud-selected-menu-titles ())
-(setq gud-selected-menu-titles 
-      '(RUNNING STACK DATA BREAKPOINTS FILES))  
-
-(setq gud-running-menu
-  (list
-   '(RUNNING stack breakpoints files)
-   '(target run next step continue finish stepi kill help-running)))
-  
-(setq gud-stack-menu
-  (list
-   '(running STACK breakpoints files)
-   '(up down frame backtrace return help-stack)))
-  
-(setq gud-data-menu
-  (list
-   '(running stack DATA breakpoints files)
-   '(whatis ptype print set display undisplay disassemble help-data)))
-
-(setq gud-breakpoints-menu
-  (list
-   '(running stack BREAKPOINTS files)
-   '(awatch rwatch watch break delete enable disable condition ignore help-breakpoints)))
-  
-(setq gud-files-menu
-  (list
-   '(running stack breakpoints FILES)
-   '(file core-file help-files)
-   '(exec-file load symbol-file add-symbol-file sharedlibrary)))
-
-(setq gud-menu-rules
-      (list
-       (list 'running gud-running-menu)
-       (list 'RUNNING gud-running-menu)
-       (list 'stack gud-stack-menu)
-       (list 'STACK gud-stack-menu)
-       (list 'data gud-data-menu)
-       (list 'DATA gud-data-menu)
-       (list 'breakpoints gud-breakpoints-menu)
-       (list 'BREAKPOINTS gud-breakpoints-menu)
-       (list 'files gud-files-menu)
-       (list 'FILES gud-files-menu)
-
-       (list 'target 'gud-target)
-       (list 'kill 'gud-kill)
-       (list 'stepi 'gud-stepi)
-       (list 'step 'gud-step)
-       (list 'next 'gud-next)
-       (list 'finish 'gud-finish)
-       (list 'continue 'gud-cont)
-       (list 'run 'gud-run)
-
-       (list 'backtrace 'gud-backtrace)
-       (list 'frame 'gud-frame)
-       (list 'down 'gud-down)
-       (list 'up 'gud-up)
-       (list 'return 'gud-return)
-
-       (list 'file 'gud-file)
-       (list 'core-file 'gud-core-file)
-       (list 'cd 'gud-cd)
-
-       (list 'exec-file 'gud-exec-file)
-       (list 'load 'gud-load)
-       (list 'symbol-file 'gud-symbol-file)
-       (list 'add-symbol-file 'gud-add-symbol-file)
-       (list 'sharedlibrary 'gud-sharedlibrary)
-       ))
-       
-
-
-
-(defun gdb-call-showing-gud (instance command)
-  (gud-display-gud-buffer instance)
-  (comint-input-sender (gdb-instance-process instance) command))
-
-(defvar gud-target-history ())
-
-(defun gud-temp-buffer-show (buf)
-  (let ((ow (selected-window)))
-    (unwind-protect
-	(progn
-	  (pop-to-buffer buf)
-
-	  ;; This insertion works around a bug in emacs.
-	  ;; The bug is that all the empty space after a
-	  ;; highlighted word that terminates a buffer
-	  ;; gets highlighted.  That's really ugly, so
-	  ;; make sure a highlighted word can't ever
-	  ;; terminate the buffer.
-	  (goto-char (point-max))
-	  (insert "\n")
-	  (goto-char (point-min))
-
-	  (if (< (window-height) 10)
-	      (enlarge-window (- 10 (window-height)))))
-      (select-window ow))))
-
-(defun gud-target (instance command)
-  (interactive 
-   (let* ((instance (gdb-needed-default-instance))
-	  (temp-buffer-show-function (function gud-temp-buffer-show))
-	  (target-name (completing-read (format "Target type: ")
-					'(("remote")
-					  ("core")
-					  ("child")
-					  ("exec"))
-					nil
-					t
-					nil
-					'gud-target-history)))
-     (list instance
-	   (cond
-	    ((equal target-name "child") "run")
-
-	    ((equal target-name "core")
-	     (concat "target core "
-		     (read-file-name "core file: "
-				     nil
-				     "core"
-				     t)))
-
-	    ((equal target-name "exec")
-	     (concat "target exec "
-		     (read-file-name "exec file: "
-				     nil
-				     "a.out"
-				     t)))
-
-	    ((equal target-name "remote")
-	     (concat "target remote "
-		     (read-file-name "serial line for remote: "
-				     "/dev/"
-				     "ttya"
-				     t)))
-
-	    (t "echo No such target command!")))))
-
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-(defun gud-backtrace ()
-  (interactive)
-  (let ((instance  (gdb-needed-default-instance)))
-    (gud-display-gud-buffer instance)
-    (apply comint-input-sender
-	   (list (gdb-instance-process instance)
-		 "backtrace"))))
-
-(defun gud-frame ()
-  (interactive)
-  (let ((instance  (gdb-needed-default-instance)))
-    (apply comint-input-sender
-	   (list (gdb-instance-process instance)
-		 "frame"))))
-
-(defun gud-return (instance command)
-   (interactive
-    (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-      (list (gdb-needed-default-instance)
-	    (concat "return " (read-string "Expression to return: ")))))
-   (gud-display-gud-buffer instance)
-   (apply comint-input-sender
-	  (list (gdb-instance-process instance) command)))
-
-
-(defun gud-file (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "file " (read-file-name "Executable to debug: "
-					   nil
-					   "a.out"
-					   t)))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-(defun gud-core-file (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "core " (read-file-name "Core file to debug: "
-					   nil
-					   "core-file"
-					   t)))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-(defun gud-cd (dir)
-  (interactive "FChange GDB's default directory: ")
-  (let ((instance (gdb-needed-default-instance)))
-    (save-excursion
-      (set-buffer (gdb-get-instance-buffer instance 'gud))
-      (cd dir))
-    (gud-display-gud-buffer instance)
-    (apply comint-input-sender
-	   (list (gdb-instance-process instance)
-		 (concat "cd " dir)))))
-
-
-(defun gud-exec-file (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "exec-file " (read-file-name "Init memory from executable: "
-						nil
-						"a.out"
-						t)))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-(defun gud-load (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "load " (read-file-name "Dynamicly load from file: "
-					   nil
-					   "a.out"
-					   t)))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-(defun gud-symbol-file (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "symbol-file " (read-file-name "Read symbol table from file: "
-						  nil
-						  "a.out"
-						  t)))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-
-(defun gud-add-symbol-file (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "add-symbol-file "
-		   (read-file-name "Add symbols from file: "
-				   nil
-				   "a.out"
-				   t)))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-
-(defun gud-sharedlibrary (instance command)
-  (interactive
-   (let ((temp-buffer-show-function (function gud-temp-buffer-show)))
-     (list (gdb-needed-default-instance)
-	   (concat "sharedlibrary "
-		   (read-string "Load symbols for files matching regexp: ")))))
-  (gud-display-gud-buffer instance)
-  (apply comint-input-sender
-	 (list (gdb-instance-process instance) command)))
-
-
-
-
-
-;;;; Window management
-
-
-;;; FIXME: This should only return true for buffers in the current instance
-(defun gud-protected-buffer-p (buffer)
-  "Is BUFFER a buffer which we want to leave displayed?"
-  (save-excursion
-    (set-buffer buffer)
-    (or gdb-buffer-type
-	overlay-arrow-position)))
-
-;;; The way we abuse the dedicated-p flag is pretty gross, but seems
-;;; to do the right thing.  Seeing as there is no way for Lisp code to
-;;; get at the use_time field of a window, I'm not sure there exists a
-;;; more elegant solution without writing C code.
-
-(defun gud-display-buffer (buf &optional size)
-  (let ((must-split nil)
-	(answer nil))
-    (unwind-protect
-	(progn
-	  (walk-windows
-	   '(lambda (win)
-	      (if (gud-protected-buffer-p (window-buffer win))
-		  (set-window-dedicated-p win t))))
-	  (setq answer (get-buffer-window buf))
-	  (if (not answer)
-	      (let ((window (get-lru-window)))
-		(if window
-		    (progn
-		      (set-window-buffer window buf)
-		      (setq answer window))
-		  (setq must-split t)))))
-      (walk-windows
-       '(lambda (win)
-	  (if (gud-protected-buffer-p (window-buffer win))
-	      (set-window-dedicated-p win nil)))))
-    (if must-split
-	(let* ((largest (get-largest-window))
-	       (cur-size (window-height largest))
-	       (new-size (and size (< size cur-size) (- cur-size size))))
-	  (setq answer (split-window largest new-size))
-	  (set-window-buffer answer buf)))
-    answer))
-
-(defun existing-source-window (buffer)
-  (catch 'found
-    (save-excursion
-      (walk-windows
-       (function
-	(lambda (win)
-	  (if (and overlay-arrow-position
-		   (eq (window-buffer win)
-		       (marker-buffer overlay-arrow-position)))
-	      (progn
-		(set-window-buffer win buffer)
-		(throw 'found win))))))
-      nil)))
-      
-(defun gud-display-source-buffer (buffer)
-  (or (existing-source-window buffer)
-      (gud-display-buffer buffer)))
-
-(defun gud-frame-buffer (buf)
-  (save-excursion
-    (set-buffer buf)
-    (make-frame)))
-
-
-
-;;; Shared keymap initialization:
-
-(defun make-windows-menu (map)
-  (define-key map [menu-bar displays]
-    (cons "GDB-Windows" (make-sparse-keymap "GDB-Windows")))
-  (define-key map [menu-bar displays gdb]
-    '("Gdb" . gud-display-gud-buffer))
-  (define-key map [menu-bar displays registers]
-    '("Registers" . gud-display-registers-buffer))
-  (define-key map [menu-bar displays frames]
-    '("Stack" . gud-display-stack-buffer))
-  (define-key map [menu-bar displays breakpoints]
-    '("Breakpoints" . gud-display-breakpoints-buffer))
-  (define-key map [menu-bar displays commands]
-    '("Commands" . gud-display-command-buffer)))
-
-(defun gud-display-gud-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-display-buffer
-   (gdb-get-create-instance-buffer instance 'gud)))
-
-(make-windows-menu gud-breakpoints-mode-map)
-(make-windows-menu gud-frames-mode-map)
-(make-windows-menu gud-registers-mode-map)
-
-
-
-(defun make-frames-menu (map)
-  (define-key map [menu-bar frames]
-    (cons "GDB-Frames" (make-sparse-keymap "GDB-Frames")))
-  (define-key map [menu-bar frames gdb]
-    '("Gdb" . gud-frame-gud-buffer))
-  (define-key map [menu-bar frames registers]
-    '("Registers" . gud-frame-registers-buffer))
-  (define-key map [menu-bar frames frames]
-    '("Stack" . gud-frame-stack-buffer))
-  (define-key map [menu-bar frames breakpoints]
-    '("Breakpoints" . gud-frame-breakpoints-buffer))
-  (define-key map [menu-bar displays commands]
-    '("Commands" . gud-display-command-buffer)))
-
-(defun gud-frame-gud-buffer (instance)
-  (interactive (list (gdb-needed-default-instance)))
-  (gud-frame-buffer
-   (gdb-get-create-instance-buffer instance 'gud)))
-
-(make-frames-menu gud-breakpoints-mode-map)
-(make-frames-menu gud-frames-mode-map)
-(make-frames-menu gud-registers-mode-map)
-
-
-(defun gud-gdb-find-file (f)
-  (find-file-noselect f))
-
-;;;###autoload
-(defun gdb (command-line)
-  "Run gdb on program FILE in buffer *gud-FILE*.
-The directory containing FILE becomes the initial working directory
-and source-file directory for your debugger."
-  (interactive
-   (list (read-from-minibuffer "Run gdb (like this): "
-			       (if (consp gud-gdb-history)
-				   (car gud-gdb-history)
-				 "gdb ")
-			       nil nil
-			       '(gud-gdb-history . 1))))
-  (gud-overload-functions
-   '((gud-massage-args . gud-gdb-massage-args)
-     (gud-marker-filter . gud-gdb-marker-filter)
-     (gud-find-file . gud-gdb-find-file)
-     ))
-
-  (let* ((words (gud-chop-words command-line))
-	 (program (car words))
-	 (file-word (let ((w (cdr words)))
-		      (while (and w (= ?- (aref (car w) 0)))
-			(setq w (cdr w)))
-		      (car w)))
-	 (args (delq file-word (cdr words)))
-	 (file (expand-file-name file-word))
-	 (filepart (file-name-nondirectory file))
-	 (buffer-name (concat "*gud-" filepart "*")))
-    (setq gdb-first-time (not (get-buffer-process buffer-name))))
-
-  (gud-common-init command-line)
-
-  (gud-def gud-break  "break %f:%l"  "\C-b" "Set breakpoint at current line.")
-  (gud-def gud-tbreak "tbreak %f:%l" "\C-t" "Set breakpoint at current line.")
-  (gud-def gud-remove "clear %l"     "\C-d" "Remove breakpoint at current line")
-  (gud-def gud-kill   "kill"	     nil    "Kill the program.")
-  (gud-def gud-run    "run"	     nil    "Run the program.")
-  (gud-def gud-stepi  "stepi %p"     "\C-i" "Step one instruction with display.")
-  (gud-def gud-step   "step %p"      "\C-s" "Step one source line with display.")
-  (gud-def gud-next   "next %p"      "\C-n" "Step one line (skip functions).")
-  (gud-def gud-finish "finish"       "\C-f" "Finish executing current function.")
-  (gud-def gud-cont   "cont"         "\C-r" "Continue with display.")
-  (gud-def gud-up     "up %p"        "<" "Up N stack frames (numeric arg).")
-  (gud-def gud-down   "down %p"      ">" "Down N stack frames (numeric arg).")
-  (gud-def gud-print  "print %e"     "\C-p" "Evaluate C expression at point.")
-
-  (setq comint-prompt-regexp "^(.*gdb[+]?) *")
-  (setq comint-input-sender 'gdb-send)
-  (run-hooks 'gdb-mode-hook)
-  (let ((instance
-	 (make-gdb-instance (get-buffer-process (current-buffer)))
-	 ))
-    (if gdb-first-time (gdb-clear-inferior-io instance)))
-  )
-
-
-;; ======================================================================
-;; sdb functions
-
-;;; History of argument lists passed to sdb.
-(defvar gud-sdb-history nil)
-
-(defvar gud-sdb-needs-tags (not (file-exists-p "/var"))
-  "If nil, we're on a System V Release 4 and don't need the tags hack.")
-
-(defvar gud-sdb-lastfile nil)
-
-(defun gud-sdb-massage-args (file args)
-  (cons file args))
-
-(defun gud-sdb-marker-filter (string)
-  (cond 
-   ;; System V Release 3.2 uses this format
-   ((string-match "\\(^0x\\w* in \\|^\\|\n\\)\\([^:\n]*\\):\\([0-9]*\\):.*\n"
-		    string)
-    (setq gud-last-frame
-	  (cons
-	   (substring string (match-beginning 2) (match-end 2))
-	   (string-to-int 
-	    (substring string (match-beginning 3) (match-end 3))))))
-   ;; System V Release 4.0 
-   ((string-match "^\\(BREAKPOINT\\|STEPPED\\) process [0-9]+ function [^ ]+ in \\(.+\\)\n"
-		       string)
-    (setq gud-sdb-lastfile
-	  (substring string (match-beginning 2) (match-end 2))))
-   ((and gud-sdb-lastfile (string-match "^\\([0-9]+\\):" string))
-	 (setq gud-last-frame
-	       (cons
-		gud-sdb-lastfile
-		(string-to-int 
-		 (substring string (match-beginning 1) (match-end 1))))))
-   (t 
-    (setq gud-sdb-lastfile nil)))
-  string)
-
-(defun gud-sdb-find-file (f)
-  (if gud-sdb-needs-tags
-      (find-tag-noselect f)
-    (find-file-noselect f)))
-
-;;;###autoload
-(defun sdb (command-line)
-  "Run sdb on program FILE in buffer *gud-FILE*.
-The directory containing FILE becomes the initial working directory
-and source-file directory for your debugger."
-  (interactive
-   (list (read-from-minibuffer "Run sdb (like this): "
-			       (if (consp gud-sdb-history)
-				   (car gud-sdb-history)
-				 "sdb ")
-			       nil nil
-			       '(gud-sdb-history . 1))))
-  (if (and gud-sdb-needs-tags
-	   (not (and (boundp 'tags-file-name) (file-exists-p tags-file-name))))
-      (error "The sdb support requires a valid tags table to work."))
-  (gud-overload-functions '((gud-massage-args . gud-sdb-massage-args)
-			    (gud-marker-filter . gud-sdb-marker-filter)
-			    (gud-find-file . gud-sdb-find-file)
-			    ))
-
-  (gud-common-init command-line)
-
-  (gud-def gud-break  "%l b" "\C-b"   "Set breakpoint at current line.")
-  (gud-def gud-tbreak "%l c" "\C-t"   "Set temporary breakpoint at current line.")
-  (gud-def gud-remove "%l d" "\C-d"   "Remove breakpoint at current line")
-  (gud-def gud-step   "s %p" "\C-s"   "Step one source line with display.")
-  (gud-def gud-stepi  "i %p" "\C-i"   "Step one instruction with display.")
-  (gud-def gud-next   "S %p" "\C-n"   "Step one line (skip functions).")
-  (gud-def gud-cont   "c"    "\C-r"   "Continue with display.")
-  (gud-def gud-print  "%e/"  "\C-p"   "Evaluate C expression at point.")
-
-  (setq comint-prompt-regexp  "\\(^\\|\n\\)\\*")
-  (run-hooks 'sdb-mode-hook)
-  )
-
-;; ======================================================================
-;; dbx functions
-
-;;; History of argument lists passed to dbx.
-(defvar gud-dbx-history nil)
-
-(defun gud-dbx-massage-args (file args)
-  (cons file args))
-
-(defun gud-dbx-marker-filter (string)
-  (if (or (string-match
-         "stopped in .* at line \\([0-9]*\\) in file \"\\([^\"]*\\)\""
-         string)
-        (string-match
-         "signal .* in .* at line \\([0-9]*\\) in file \"\\([^\"]*\\)\""
-         string))
-      (setq gud-last-frame
-	    (cons
-	     (substring string (match-beginning 2) (match-end 2))
-	     (string-to-int 
-	      (substring string (match-beginning 1) (match-end 1))))))
-  string)
-
-(defun gud-dbx-find-file (f)
-  (find-file-noselect f))
-
-;;;###autoload
-(defun dbx (command-line)
-  "Run dbx on program FILE in buffer *gud-FILE*.
-The directory containing FILE becomes the initial working directory
-and source-file directory for your debugger."
-  (interactive
-   (list (read-from-minibuffer "Run dbx (like this): "
-			       (if (consp gud-dbx-history)
-				   (car gud-dbx-history)
-				 "dbx ")
-			       nil nil
-			       '(gud-dbx-history . 1))))
-  (gud-overload-functions '((gud-massage-args . gud-dbx-massage-args)
-			    (gud-marker-filter . gud-dbx-marker-filter)
-			    (gud-find-file . gud-dbx-find-file)
-			    ))
-
-  (gud-common-init command-line)
-
-  (gud-def gud-break  "file \"%d%f\"\nstop at %l"
-	   			  "\C-b" "Set breakpoint at current line.")
-;;  (gud-def gud-break  "stop at \"%f\":%l"
-;;	   			  "\C-b" "Set breakpoint at current line.")
-  (gud-def gud-remove "clear %l"  "\C-d" "Remove breakpoint at current line")
-  (gud-def gud-step   "step %p"	  "\C-s" "Step one line with display.")
-  (gud-def gud-stepi  "stepi %p"  "\C-i" "Step one instruction with display.")
-  (gud-def gud-next   "next %p"	  "\C-n" "Step one line (skip functions).")
-  (gud-def gud-cont   "cont"	  "\C-r" "Continue with display.")
-  (gud-def gud-up     "up %p"	  "<" "Up (numeric arg) stack frames.")
-  (gud-def gud-down   "down %p"	  ">" "Down (numeric arg) stack frames.")
-  (gud-def gud-print  "print %e"  "\C-p" "Evaluate C expression at point.")
-
-  (setq comint-prompt-regexp  "^[^)]*dbx) *")
-  (run-hooks 'dbx-mode-hook)
-  )
-
-;; ======================================================================
-;; xdb (HP PARISC debugger) functions
-
-;;; History of argument lists passed to xdb.
-(defvar gud-xdb-history nil)
-
-(defvar gud-xdb-directories nil
-  "*A list of directories that xdb should search for source code.
-If nil, only source files in the program directory
-will be known to xdb.
-
-The file names should be absolute, or relative to the directory
-containing the executable being debugged.")
-
-(defun gud-xdb-massage-args (file args)
-  (nconc (let ((directories gud-xdb-directories)
-	       (result nil))
-	   (while directories
-	     (setq result (cons (car directories) (cons "-d" result)))
-	     (setq directories (cdr directories)))
-	   (nreverse (cons file result)))
-	 args))
-
-(defun gud-xdb-file-name (f)
-  "Transform a relative pathname to a full pathname in xdb mode"
-  (let ((result nil))
-    (if (file-exists-p f)
-        (setq result (expand-file-name f))
-      (let ((directories gud-xdb-directories))
-        (while directories
-          (let ((path (concat (car directories) "/" f)))
-            (if (file-exists-p path)
-                (setq result (expand-file-name path)
-                      directories nil)))
-          (setq directories (cdr directories)))))
-    result))
-
-;; xdb does not print the lines all at once, so we have to accumulate them
-(defvar gud-xdb-accumulation "")
-
-(defun gud-xdb-marker-filter (string)
-  (let (result)
-    (if (or (string-match comint-prompt-regexp string)
-            (string-match ".*\012" string))
-        (setq result (concat gud-xdb-accumulation string)
-              gud-xdb-accumulation "")
-      (setq gud-xdb-accumulation (concat gud-xdb-accumulation string)))
-    (if result
-        (if (or (string-match "\\([^\n \t:]+\\): [^:]+: \\([0-9]+\\):" result)
-                (string-match "[^: \t]+:[ \t]+\\([^:]+\\): [^:]+: \\([0-9]+\\):"
-                              result))
-            (let ((line (string-to-int 
-                         (substring result (match-beginning 2) (match-end 2))))
-                  (file (gud-xdb-file-name
-                         (substring result (match-beginning 1) (match-end 1)))))
-              (if file
-                  (setq gud-last-frame (cons file line))))))
-    (or result "")))    
-               
-(defun gud-xdb-find-file (f)
-  (let ((realf (gud-xdb-file-name f)))
-    (if realf (find-file-noselect realf))))
-
-;;;###autoload
-(defun xdb (command-line)
-  "Run xdb on program FILE in buffer *gud-FILE*.
-The directory containing FILE becomes the initial working directory
-and source-file directory for your debugger.
-
-You can set the variable 'gud-xdb-directories' to a list of program source
-directories if your program contains sources from more than one directory."
-  (interactive
-   (list (read-from-minibuffer "Run xdb (like this): "
-			       (if (consp gud-xdb-history)
-				   (car gud-xdb-history)
-				 "xdb ")
-			       nil nil
-			       '(gud-xdb-history . 1))))
-  (gud-overload-functions '((gud-massage-args . gud-xdb-massage-args)
-			    (gud-marker-filter . gud-xdb-marker-filter)
-			    (gud-find-file . gud-xdb-find-file)))
-
-  (gud-common-init command-line)
-
-  (gud-def gud-break  "b %f:%l"    "\C-b" "Set breakpoint at current line.")
-  (gud-def gud-tbreak "b %f:%l\\t" "\C-t"
-           "Set temporary breakpoint at current line.")
-  (gud-def gud-remove "db"         "\C-d" "Remove breakpoint at current line")
-  (gud-def gud-step   "s %p"	   "\C-s" "Step one line with display.")
-  (gud-def gud-next   "S %p"	   "\C-n" "Step one line (skip functions).")
-  (gud-def gud-cont   "c"	   "\C-r" "Continue with display.")
-  (gud-def gud-up     "up %p"	   "<"    "Up (numeric arg) stack frames.")
-  (gud-def gud-down   "down %p"	   ">"    "Down (numeric arg) stack frames.")
-  (gud-def gud-finish "bu\\t"      "\C-f" "Finish executing current function.")
-  (gud-def gud-print  "p %e"       "\C-p" "Evaluate C expression at point.")
-
-  (setq comint-prompt-regexp  "^>")
-  (make-local-variable 'gud-xdb-accumulation)
-  (setq gud-xdb-accumulation "")
-  (run-hooks 'xdb-mode-hook))
-
-;; ======================================================================
-;; perldb functions
-
-;;; History of argument lists passed to perldb.
-(defvar gud-perldb-history nil)
-
-(defun gud-perldb-massage-args (file args)
-  (cons "-d" (cons file (cons "-emacs" args))))
-
-;; There's no guarantee that Emacs will hand the filter the entire
-;; marker at once; it could be broken up across several strings.  We
-;; might even receive a big chunk with several markers in it.  If we
-;; receive a chunk of text which looks like it might contain the
-;; beginning of a marker, we save it here between calls to the
-;; filter.
-(defvar gud-perldb-marker-acc "")
-
-(defun gud-perldb-marker-filter (string)
-  (save-match-data
-    (setq gud-perldb-marker-acc (concat gud-perldb-marker-acc string))
-    (let ((output ""))
-
-      ;; Process all the complete markers in this chunk.
-      (while (string-match "^\032\032\\([^:\n]*\\):\\([0-9]*\\):.*\n"
-			   gud-perldb-marker-acc)
-	(setq
-
-	 ;; Extract the frame position from the marker.
-	 gud-last-frame
-	 (cons (substring gud-perldb-marker-acc (match-beginning 1) (match-end 1))
-	       (string-to-int (substring gud-perldb-marker-acc
-					 (match-beginning 2)
-					 (match-end 2))))
-
-	 ;; Append any text before the marker to the output we're going
-	 ;; to return - we don't include the marker in this text.
-	 output (concat output
-			(substring gud-perldb-marker-acc 0 (match-beginning 0)))
-
-	 ;; Set the accumulator to the remaining text.
-	 gud-perldb-marker-acc (substring gud-perldb-marker-acc (match-end 0))))
-
-      ;; Does the remaining text look like it might end with the
-      ;; beginning of another marker?  If it does, then keep it in
-      ;; gud-perldb-marker-acc until we receive the rest of it.  Since we
-      ;; know the full marker regexp above failed, it's pretty simple to
-      ;; test for marker starts.
-      (if (string-match "^\032.*\\'" gud-perldb-marker-acc)
-	  (progn
-	    ;; Everything before the potential marker start can be output.
-	    (setq output (concat output (substring gud-perldb-marker-acc
-						   0 (match-beginning 0))))
-
-	    ;; Everything after, we save, to combine with later input.
-	    (setq gud-perldb-marker-acc
-		  (substring gud-perldb-marker-acc (match-beginning 0))))
-
-	(setq output (concat output gud-perldb-marker-acc)
-	      gud-perldb-marker-acc ""))
-
-      output)))
-
-(defun gud-perldb-find-file (f)
-  (find-file-noselect f))
-
-;;;###autoload
-(defun perldb (command-line)
-  "Run perldb on program FILE in buffer *gud-FILE*.
-The directory containing FILE becomes the initial working directory
-and source-file directory for your debugger."
-  (interactive
-   (list (read-from-minibuffer "Run perldb (like this): "
-			       (if (consp gud-perldb-history)
-				   (car gud-perldb-history)
-				 "perl ")
-			       nil nil
-			       '(gud-perldb-history . 1))))
-  (gud-overload-functions '((gud-massage-args . gud-perldb-massage-args)
-			    (gud-marker-filter . gud-perldb-marker-filter)
-			    (gud-find-file . gud-perldb-find-file)
-			    ))
-
-  (gud-common-init command-line)
-
-  (gud-def gud-break  "b %l"         "\C-b" "Set breakpoint at current line.")
-  (gud-def gud-remove "d %l"         "\C-d" "Remove breakpoint at current line")
-  (gud-def gud-step   "s"            "\C-s" "Step one source line with display.")
-  (gud-def gud-next   "n"            "\C-n" "Step one line (skip functions).")
-  (gud-def gud-cont   "c"            "\C-r" "Continue with display.")
-;  (gud-def gud-finish "finish"       "\C-f" "Finish executing current function.")
-;  (gud-def gud-up     "up %p"        "<" "Up N stack frames (numeric arg).")
-;  (gud-def gud-down   "down %p"      ">" "Down N stack frames (numeric arg).")
-  (gud-def gud-print  "%e"           "\C-p" "Evaluate perl expression at point.")
-
-  (setq comint-prompt-regexp "^  DB<[0-9]+> ")
-  (run-hooks 'perldb-mode-hook)
-  )
-
-;;
-;; End of debugger-specific information
-;;
-
-
-;;; When we send a command to the debugger via gud-call, it's annoying
-;;; to see the command and the new prompt inserted into the debugger's
-;;; buffer; we have other ways of knowing the command has completed.
-;;;
-;;; If the buffer looks like this:
-;;; --------------------
-;;; (gdb) set args foo bar
-;;; (gdb) -!-
-;;; --------------------
-;;; (the -!- marks the location of point), and we type `C-x SPC' in a
-;;; source file to set a breakpoint, we want the buffer to end up like
-;;; this:
-;;; --------------------
-;;; (gdb) set args foo bar
-;;; Breakpoint 1 at 0x92: file make-docfile.c, line 49.
-;;; (gdb) -!-
-;;; --------------------
-;;; Essentially, the old prompt is deleted, and the command's output
-;;; and the new prompt take its place.
-;;;
-;;; Not echoing the command is easy enough; you send it directly using
-;;; comint-input-sender, and it never enters the buffer.  However,
-;;; getting rid of the old prompt is trickier; you don't want to do it
-;;; when you send the command, since that will result in an annoying
-;;; flicker as the prompt is deleted, redisplay occurs while Emacs
-;;; waits for a response from the debugger, and the new prompt is
-;;; inserted.  Instead, we'll wait until we actually get some output
-;;; from the subprocess before we delete the prompt.  If the command
-;;; produced no output other than a new prompt, that prompt will most
-;;; likely be in the first chunk of output received, so we will delete
-;;; the prompt and then replace it with an identical one.  If the
-;;; command produces output, the prompt is moving anyway, so the
-;;; flicker won't be annoying.
-;;;
-;;; So - when we want to delete the prompt upon receipt of the next
-;;; chunk of debugger output, we position gud-delete-prompt-marker at
-;;; the start of the prompt; the process filter will notice this, and
-;;; delete all text between it and the process output marker.  If
-;;; gud-delete-prompt-marker points nowhere, we leave the current
-;;; prompt alone.
-(defvar gud-delete-prompt-marker nil)
-
-
-(defvar gdbish-comint-mode-map (copy-keymap comint-mode-map))
-(define-key gdbish-comint-mode-map "\C-c\M-\C-r" 'gud-display-registers-buffer)
-(define-key gdbish-comint-mode-map "\C-c\M-\C-f" 'gud-display-stack-buffer)
-(define-key gdbish-comint-mode-map "\C-c\M-\C-b" 'gud-display-breakpoints-buffer)
-
-(make-windows-menu gdbish-comint-mode-map)
-(make-frames-menu gdbish-comint-mode-map)
-
-(defun gud-mode ()
-  "Major mode for interacting with an inferior debugger process.
-
-   You start it up with one of the commands M-x gdb, M-x sdb, M-x dbx,
-or M-x xdb.  Each entry point finishes by executing a hook; `gdb-mode-hook',
-`sdb-mode-hook', `dbx-mode-hook' or `xdb-mode-hook' respectively.
-
-After startup, the following commands are available in both the GUD
-interaction buffer and any source buffer GUD visits due to a breakpoint stop
-or step operation:
-
-\\[gud-break] sets a breakpoint at the current file and line.  In the
-GUD buffer, the current file and line are those of the last breakpoint or
-step.  In a source buffer, they are the buffer's file and current line.
-
-\\[gud-remove] removes breakpoints on the current file and line.
-
-\\[gud-refresh] displays in the source window the last line referred to
-in the gud buffer.
-
-\\[gud-step], \\[gud-next], and \\[gud-stepi] do a step-one-line,
-step-one-line (not entering function calls), and step-one-instruction
-and then update the source window with the current file and position.
-\\[gud-cont] continues execution.
-
-\\[gud-print] tries to find the largest C lvalue or function-call expression
-around point, and sends it to the debugger for value display.
-
-The above commands are common to all supported debuggers except xdb which
-does not support stepping instructions.
-
-Under gdb, sdb and xdb, \\[gud-tbreak] behaves exactly like \\[gud-break],
-except that the breakpoint is temporary; that is, it is removed when
-execution stops on it.
-
-Under gdb, dbx, and xdb, \\[gud-up] pops up through an enclosing stack
-frame.  \\[gud-down] drops back down through one.
-
-If you are using gdb or xdb, \\[gud-finish] runs execution to the return from
-the current function and stops.
-
-All the keystrokes above are accessible in the GUD buffer
-with the prefix C-c, and in all buffers through the prefix C-x C-a.
-
-All pre-defined functions for which the concept make sense repeat
-themselves the appropriate number of times if you give a prefix
-argument.
-
-You may use the `gud-def' macro in the initialization hook to define other
-commands.
-
-Other commands for interacting with the debugger process are inherited from
-comint mode, which see."
-  (interactive)
-  (comint-mode)
-  (setq major-mode 'gud-mode)
-  (setq mode-name "Debugger")
-  (setq mode-line-process '(": %s"))
-  (use-local-map (copy-keymap gdbish-comint-mode-map))
-  (setq gud-last-frame nil)
-  (make-local-variable 'comint-prompt-regexp)
-  (make-local-variable 'gud-delete-prompt-marker)
-  (setq gud-delete-prompt-marker (make-marker))
-  (run-hooks 'gud-mode-hook)
-)
-
-(defvar gud-comint-buffer nil)
-
-;; Chop STRING into words separated by SPC or TAB and return a list of them.
-(defun gud-chop-words (string)
-  (let ((i 0) (beg 0)
-	(len (length string))
-	(words nil))
-    (while (< i len)
-      (if (memq (aref string i) '(?\t ? ))
-	  (progn
-	    (setq words (cons (substring string beg i) words)
-		  beg (1+ i))
-	    (while (and (< beg len) (memq (aref string beg) '(?\t ? )))
-	      (setq beg (1+ beg)))
-	    (setq i (1+ beg)))
-	(setq i (1+ i))))
-    (if (< beg len)
-	(setq words (cons (substring string beg) words)))
-    (nreverse words)))
-
-(defvar gud-target-name "--unknown--"
-  "The apparent name of the program being debugged in a gud buffer.
-For sure this the root string used in smashing together the gud 
-buffer's name, even if that doesn't happen to be the name of a 
-program.")
-
-;; Perform initializations common to all debuggers.
-(defun gud-common-init (command-line)
-  (let* ((words (gud-chop-words command-line))
-	 (program (car words))
-	 (file-word (let ((w (cdr words)))
-		      (while (and w (= ?- (aref (car w) 0)))
-			(setq w (cdr w)))
-		      (car w)))
-	 (args (delq file-word (cdr words)))
-	 (file (expand-file-name file-word))
-	 (filepart (file-name-nondirectory file))
-	 (buffer-name (concat "*gud-" filepart "*")))
-    (switch-to-buffer buffer-name)
-    (setq default-directory (file-name-directory file))
-    (or (bolp) (newline))
-    (insert "Current directory is " default-directory "\n")
-    (let ((old-instance gdb-buffer-instance))
-      (apply 'make-comint (concat "gud-" filepart) program nil
-	     (gud-massage-args file args))
-      (gud-mode)
-      (make-variable-buffer-local 'old-gdb-buffer-instance)
-      (setq old-gdb-buffer-instance old-instance))
-    (make-variable-buffer-local 'gud-target-name)
-    (setq gud-target-name filepart))
-  (set-process-filter (get-buffer-process (current-buffer)) 'gud-filter)
-  (set-process-sentinel (get-buffer-process (current-buffer)) 'gud-sentinel)
-  (gud-set-buffer)
-  )
-
-(defun gud-set-buffer ()
-  (cond ((eq major-mode 'gud-mode)
-	(setq gud-comint-buffer (current-buffer)))))
-
-;; These functions are responsible for inserting output from your debugger
-;; into the buffer.  The hard work is done by the method that is
-;; the value of gud-marker-filter.
-
-(defun gud-filter (proc string)
-  ;; Here's where the actual buffer insertion is done
-  (let ((inhibit-quit t))
-    (save-excursion
-      (set-buffer (process-buffer proc))
-      (let (moving output-after-point)
-	(save-excursion
-	  (goto-char (process-mark proc))
-	  ;; If we have been so requested, delete the debugger prompt.
-	  (if (marker-buffer gud-delete-prompt-marker)
-	      (progn
-		(delete-region (point) gud-delete-prompt-marker)
-		(set-marker gud-delete-prompt-marker nil)))
-	  (insert-before-markers (gud-marker-filter string))
-	  (setq moving (= (point) (process-mark proc)))
-	  (setq output-after-point (< (point) (process-mark proc)))
-	  ;; Check for a filename-and-line number.
-	  ;; Don't display the specified file
-	  ;; unless (1) point is at or after the position where output appears
-	  ;; and (2) this buffer is on the screen.
-	  (if (and gud-last-frame
-		   (not output-after-point)
-		   (get-buffer-window (current-buffer)))
-	      (gud-display-frame)))
-	(if moving (goto-char (process-mark proc)))))))
-
-(defun gud-proc-died (proc)
-  ;; Stop displaying an arrow in a source file.
-  (setq overlay-arrow-position nil)
-
-  ;; Kill the dummy process, so that C-x C-c won't worry about it.
-  (save-excursion
-    (set-buffer (process-buffer proc))
-    (kill-process
-     (get-buffer-process
-      (gdb-get-instance-buffer gdb-buffer-instance 'gdb-inferior-io))))
-  )
-
-(defun gud-sentinel (proc msg)
-  (cond ((null (buffer-name (process-buffer proc)))
-	 ;; buffer killed
-	 (gud-proc-died proc)
-	 (set-process-buffer proc nil))
-	((memq (process-status proc) '(signal exit))
-	 (gud-proc-died proc)
-
-	 ;; Fix the mode line.
-	 (setq mode-line-process
-	       (concat ": "
-		       (symbol-name (process-status proc))))
-	 (let* ((obuf (current-buffer)))
-	   ;; save-excursion isn't the right thing if
-	   ;;  process-buffer is current-buffer
-	   (unwind-protect
-	       (progn
-		 ;; Write something in *compilation* and hack its mode line,
-		 (set-buffer (process-buffer proc))
-		 ;; Force mode line redisplay soon
-		 (set-buffer-modified-p (buffer-modified-p))
-		 (if (eobp)
-		     (insert ?\n mode-name " " msg)
-		   (save-excursion
-		     (goto-char (point-max))
-		     (insert ?\n mode-name " " msg)))
-		 ;; If buffer and mode line will show that the process
-		 ;; is dead, we can delete it now.  Otherwise it
-		 ;; will stay around until M-x list-processes.
-		 (delete-process proc))
-	     ;; Restore old buffer, but don't restore old point
-	     ;; if obuf is the gud buffer.
-	     (set-buffer obuf))))))
-
-(defun gud-display-frame ()
-  "Find and obey the last filename-and-line marker from the debugger.
-Obeying it means displaying in another window the specified file and line."
-  (interactive)
-  (if gud-last-frame
-   (progn
-;     (gud-set-buffer)
-     (gud-display-line (car gud-last-frame) (cdr gud-last-frame))
-     (setq gud-last-last-frame gud-last-frame
-	   gud-last-frame nil))))
-
-;; Make sure the file named TRUE-FILE is in a buffer that appears on the screen
-;; and that its line LINE is visible.
-;; Put the overlay-arrow on the line LINE in that buffer.
-;; Most of the trickiness in here comes from wanting to preserve the current
-;; region-restriction if that's possible.  We use an explicit display-buffer
-;; to get around the fact that this is called inside a save-excursion.
-
-(defun gud-display-line (true-file line)
-  (let* ((buffer (gud-find-file true-file))
-	 (window (gud-display-source-buffer buffer))
-	 (pos))
-    (if (not window)
-	(error "foo bar baz"))
-;;;    (if (equal buffer (current-buffer))
-;;;	nil
-;;;      (setq buffer-read-only nil))
-    (save-excursion
-;;;      (setq buffer-read-only t)
-      (set-buffer buffer)
-      (save-restriction
-	(widen)
-	(goto-line line)
-	(setq pos (point))
-	(setq overlay-arrow-string "=>")
-	(or overlay-arrow-position
-	    (setq overlay-arrow-position (make-marker)))
-	(set-marker overlay-arrow-position (point) (current-buffer)))
-      (cond ((or (< pos (point-min)) (> pos (point-max)))
-	     (widen)
-	     (goto-char pos))))
-    (set-window-point window overlay-arrow-position)))
-
-;;; The gud-call function must do the right thing whether its invoking
-;;; keystroke is from the GUD buffer itself (via major-mode binding)
-;;; or a C buffer.  In the former case, we want to supply data from
-;;; gud-last-frame.  Here's how we do it:
-
-(defun gud-format-command (str arg)
-  (let ((insource (not (eq (current-buffer) gud-comint-buffer))))
-    (if (string-match "\\(.*\\)%f\\(.*\\)" str)
-	(setq str (concat
-		   (substring str (match-beginning 1) (match-end 1))
-		   (file-name-nondirectory (if insource
-					       (buffer-file-name)
-					     (car gud-last-frame)))
-		   (substring str (match-beginning 2) (match-end 2)))))
-    (if (string-match "\\(.*\\)%d\\(.*\\)" str)
-	(setq str (concat
-		   (substring str (match-beginning 1) (match-end 1))
-		   (file-name-directory (if insource
-					    (buffer-file-name)
-					  (car gud-last-frame)))
-		   (substring str (match-beginning 2) (match-end 2)))))
-    (if (string-match "\\(.*\\)%l\\(.*\\)" str)
-	(setq str (concat
-		   (substring str (match-beginning 1) (match-end 1))
-		   (if insource
-		       (save-excursion
-			 (beginning-of-line)
-			 (save-restriction (widen) 
-					   (1+ (count-lines 1 (point)))))
-		     (cdr gud-last-frame))
-		   (substring str (match-beginning 2) (match-end 2)))))
-    (if (string-match "\\(.*\\)%e\\(.*\\)" str)
-	(setq str (concat
-		   (substring str (match-beginning 1) (match-end 1))
-		   (find-c-expr)
-		   (substring str (match-beginning 2) (match-end 2)))))
-    (if (string-match "\\(.*\\)%a\\(.*\\)" str)
-	(setq str (concat
-		   (substring str (match-beginning 1) (match-end 1))
-		   (gud-read-address)
-		   (substring str (match-beginning 2) (match-end 2)))))
-    (if (string-match "\\(.*\\)%p\\(.*\\)" str)
-	(setq str (concat
-		   (substring str (match-beginning 1) (match-end 1))
-		   (if arg (int-to-string arg) "")
-		   (substring str (match-beginning 2) (match-end 2)))))
-    )
-  str
-  )
-
-(defun gud-read-address ()
-  "Return a string containing the core-address found in the buffer at point."
-  (save-excursion
-    (let ((pt (point)) found begin)
-      (setq found (if (search-backward "0x" (- pt 7) t) (point)))
-      (cond
-       (found (forward-char 2)
-	      (buffer-substring found
-				(progn (re-search-forward "[^0-9a-f]")
-				       (forward-char -1)
-				       (point))))
-       (t (setq begin (progn (re-search-backward "[^0-9]") 
-			     (forward-char 1)
-			     (point)))
-	  (forward-char 1)
-	  (re-search-forward "[^0-9]")
-	  (forward-char -1)
-	  (buffer-substring begin (point)))))))
-
-(defun gud-call (fmt &optional arg)
-  (let ((msg (gud-format-command fmt arg)))
-    (message "Command: %s" msg)
-    (sit-for 0)
-    (gud-basic-call msg)))
-
-(defun gud-basic-call (command)
-  "Invoke the debugger COMMAND displaying source in other window."
-  (interactive)
-  (gud-set-buffer)
-  (let ((proc (get-buffer-process gud-comint-buffer)))
-
-    ;; Arrange for the current prompt to get deleted.
-    (save-excursion
-      (set-buffer gud-comint-buffer)
-      (goto-char (process-mark proc))
-      (beginning-of-line)
-      (if (looking-at comint-prompt-regexp)
-	  (set-marker gud-delete-prompt-marker (point)))
-      (apply comint-input-sender (list proc command)))))
-
-(defun gud-refresh (&optional arg)
-  "Fix up a possibly garbled display, and redraw the arrow."
-  (interactive "P")
-  (recenter arg)
-  (or gud-last-frame (setq gud-last-frame gud-last-last-frame))
-  (gud-display-frame))
-
-;;; Code for parsing expressions out of C code.  The single entry point is
-;;; find-c-expr, which tries to return an lvalue expression from around point.
-;;;
-;;; The rest of this file is a hacked version of gdbsrc.el by
-;;; Debby Ayers <ayers@asc.slb.com>,
-;;; Rich Schaefer <schaefer@asc.slb.com> Schlumberger, Austin, Tx.
-
-(defun find-c-expr ()
-  "Returns the C expr that surrounds point."
-  (interactive)
-  (save-excursion
-    (let ((p) (expr) (test-expr))
-      (setq p (point))
-      (setq expr (expr-cur))
-      (setq test-expr (expr-prev))
-      (while (expr-compound test-expr expr)
-	(setq expr (cons (car test-expr) (cdr expr)))
-	(goto-char (car expr))
-	(setq test-expr (expr-prev)))
-      (goto-char p)
-      (setq test-expr (expr-next))
-      (while (expr-compound expr test-expr)
-	(setq expr (cons (car expr) (cdr test-expr)))
-	(setq test-expr (expr-next))
-	)
-      (buffer-substring (car expr) (cdr expr)))))
-
-(defun expr-cur ()
-  "Returns the expr that point is in; point is set to beginning of expr.
-The expr is represented as a cons cell, where the car specifies the point in
-the current buffer that marks the beginning of the expr and the cdr specifies 
-the character after the end of the expr."
-  (let ((p (point)) (begin) (end))
-    (expr-backward-sexp)
-    (setq begin (point))
-    (expr-forward-sexp)
-    (setq end (point))
-    (if (>= p end) 
-	(progn
-	 (setq begin p)
-	 (goto-char p)
-	 (expr-forward-sexp)
-	 (setq end (point))
-	 )
-      )
-    (goto-char begin)
-    (cons begin end)))
-
-(defun expr-backward-sexp ()
-  "Version of `backward-sexp' that catches errors."
-  (condition-case nil
-      (backward-sexp)
-    (error t)))
-
-(defun expr-forward-sexp ()
-  "Version of `forward-sexp' that catches errors."
-  (condition-case nil
-     (forward-sexp)
-    (error t)))
-
-(defun expr-prev ()
-  "Returns the previous expr, point is set to beginning of that expr.
-The expr is represented as a cons cell, where the car specifies the point in
-the current buffer that marks the beginning of the expr and the cdr specifies 
-the character after the end of the expr"
-  (let ((begin) (end))
-    (expr-backward-sexp)
-    (setq begin (point))
-    (expr-forward-sexp)
-    (setq end (point))
-    (goto-char begin)
-    (cons begin end)))
-
-(defun expr-next ()
-  "Returns the following expr, point is set to beginning of that expr.
-The expr is represented as a cons cell, where the car specifies the point in
-the current buffer that marks the beginning of the expr and the cdr specifies 
-the character after the end of the expr."
-  (let ((begin) (end))
-    (expr-forward-sexp)
-    (expr-forward-sexp)
-    (setq end (point))
-    (expr-backward-sexp)
-    (setq begin (point))
-    (cons begin end)))
-
-(defun expr-compound-sep (span-start span-end)
-  "Returns '.' for '->' & '.', returns ' ' for white space,
-returns '?' for other punctuation."
-  (let ((result ? )
-	(syntax))
-    (while (< span-start span-end)
-      (setq syntax (char-syntax (char-after span-start)))
-      (cond
-       ((= syntax ? ) t)
-       ((= syntax ?.) (setq syntax (char-after span-start))
-	(cond 
-	 ((= syntax ?.) (setq result ?.))
-	 ((and (= syntax ?-) (= (char-after (+ span-start 1)) ?>))
-	  (setq result ?.)
-	  (setq span-start (+ span-start 1)))
-	 (t (setq span-start span-end)
-	    (setq result ??)))))
-      (setq span-start (+ span-start 1)))
-    result))
-
-(defun expr-compound (first second)
-  "Non-nil if concatenating FIRST and SECOND makes a single C token.
-The two exprs are represented as a cons cells, where the car 
-specifies the point in the current buffer that marks the beginning of the 
-expr and the cdr specifies the character after the end of the expr.
-Link exprs of the form:
-      Expr -> Expr
-      Expr . Expr
-      Expr (Expr)
-      Expr [Expr]
-      (Expr) Expr
-      [Expr] Expr"
-  (let ((span-start (cdr first))
-	(span-end (car second))
-	(syntax))
-    (setq syntax (expr-compound-sep span-start span-end))
-    (cond
-     ((= (car first) (car second)) nil)
-     ((= (cdr first) (cdr second)) nil)
-     ((= syntax ?.) t)
-     ((= syntax ? )
-	 (setq span-start (char-after (- span-start 1)))
-	 (setq span-end (char-after span-end))
-	 (cond
-	  ((= span-start ?) ) t )
-	  ((= span-start ?] ) t )
-          ((= span-end ?( ) t )
-	  ((= span-end ?[ ) t )
-	  (t nil))
-	 )
-     (t nil))))
-
-(provide 'gud)
-
-;;; gud.el ends here