/usr/share/rep/0.90.2/lisp/rep/lang/debugger.jl is in librep-dev 0.90.2-1.4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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$Id$
Copyright (C) 1993, 1994, 2000 John Harper <john@dcs.warwick.ac.uk>
This file is part of Librep.
Librep 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.
Librep 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 Librep; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;; XXX extend this to support the structure inspection meta-commands
;; of the top-level repl
(define-structure rep.lang.debugger ()
(open rep
rep.system
rep.structures
rep.regexp
rep.io.files
rep.io.readline)
(define emit-emacs-tokens (get-command-line-option "--emacs-debug"))
;;; the form stopped on
(define obj (make-fluid))
(define depth (make-fluid))
(define frame-id (make-fluid))
(define bottom-frame-id (make-fluid))
(define last-printed-frame)
(define last (make-fluid))
;;; stack frame accessors
(define (stack-frame-function x) (nth 0 x))
(define (stack-frame-args x) (nth 1 x))
(define (stack-frame-current-form x) (nth 2 x))
(define (stack-frame-environment x) (nth 3 x))
(define (stack-frame-structure x) (nth 4 x))
;;; the debugger repl
(defun debug-rep ()
(let ((print-escape t))
(when (fluid obj)
(print-form)
(print-emacs-form (fluid obj)))
(while t
(let
((input (readline (format nil "rep-db> ")))
next-last)
(cond ((string-match "^\\s*n" input)
(fluid-set last do-next)
(do-next))
((string-match "^\\s*s" input)
(fluid-set last do-step)
(do-step))
((string-match "^\\s*c" input)
(fluid-set last do-continue)
(do-continue))
((string-match "^\\s*r\\w*\\s+" input)
(do-set-result
(eval (read-from-string (substring input (match-end))))))
((string-match "^\\s*u" input)
(setq next-last do-up)
(do-up))
((string-match "^\\s*d" input)
(setq next-last do-down)
(do-down))
((string-match "^\\s*p\\w*\\s+" input)
(condition-case data
(format standard-error "%S\n"
(eval-in-frame
(read-from-string
(substring input (match-end)))))
(error (default-error-handler (car data) (cdr data)))))
((string-match "^\\s*b" input)
(print-backtrace))
((string-match "^\\s*f" input)
(setq last-printed-frame t)
(print-frame (fluid frame-id))
(if (fluid obj)
(progn
(print-form)
(print-emacs-form (fluid obj)))
(print-emacs-frame (fluid frame-id))))
((string-match "^\\s*l" input)
(print-locals))
((string-match "^\\s*$" input)
(if (fluid last)
(progn
((fluid last))
(setq next-last (fluid last)))
(write standard-error "Nothing to repeat\n")))
(t
(write standard-error "\
commands: `n[ext]', `s[tep]', `c[ontinue]', `r[eturn] FORM',
`p[rint] FORM', `b[acktrace]', `f[orm], `l[ocals]''\n")))
(fluid-set last next-last)))))
;;; local functions
(defun print-frame (id)
(let ((frame (stack-frame-ref id)))
(if (null frame)
(format standard-error "#%-3d #undefined\n" id)
(unless (equal frame last-printed-frame)
(let ((fun (stack-frame-function frame))
(args (stack-frame-args frame))
(location (lexical-origin (stack-frame-current-form frame))))
(if (null fun)
(format standard-error "#%-3d #undefined\n" id)
(format standard-error "#%-3d %s %S%s\n" id
(or (cond ((closurep fun) (closure-name fun))
((subrp fun) (subr-name fun))
((eq (car fun) 'lambda)
(list 'lambda (cadr fun) '...))) fun)
(if (or (eq fun run-byte-code)
(eq args #undefined))
'...
args)
(if location
(format nil " at %s:%d"
(file-name-nondirectory (car location))
(cdr location))
""))))))
(setq last-printed-frame frame)))
(defun print-backtrace ()
(do ((i (fluid bottom-frame-id) (1- i)))
((< i 0))
(print-frame i)))
(defun print-form ()
(let* ((form (if (= (fluid frame-id) (fluid bottom-frame-id))
(fluid obj)
(stack-frame-current-form
(stack-frame-ref (fluid frame-id)))))
(location (lexical-origin form)))
(if location
(format standard-error "%d:\t%S\n" (cdr location) form)
(format standard-error "\t%S\n" form))))
(defun print-emacs-form (form)
(when emit-emacs-tokens
(let ((location (lexical-origin form)))
(when location
(format standard-error "\032\032%s:%d:\n"
(local-file-name (car location)) (cdr location))))))
(defun print-emacs-frame (id)
(when emit-emacs-tokens
(let* ((frame (stack-frame-ref id))
(location (and frame (lexical-origin
(stack-frame-current-form frame)))))
(when location
(print-emacs-form location)))))
(defun print-locals ()
(let ((frame (stack-frame-ref (fluid frame-id))))
(when frame
(mapc (lambda (cell)
(format standard-error "%16s %S\n"
(symbol-name (cadr cell)) (cddr cell)))
(stack-frame-environment frame)))))
(defun eval-in-frame (form)
(let ((frame (stack-frame-ref (fluid frame-id))))
(when frame
(eval form (stack-frame-structure frame)
(stack-frame-environment frame)))))
(defun entry (debug-obj debug-depth debug-frame-id)
(catch 'debug
(let-fluids ((obj debug-obj)
(depth debug-depth)
(frame-id debug-frame-id)
(bottom-frame-id debug-frame-id))
(print-frame debug-frame-id)
(debug-rep))))
(defun exit (debug-val debug-depth debug-frame-id)
(declare (unused debug-frame-id))
(unless (eq debug-val #undefined)
(format standard-error "%s-> %S\n"
(make-string debug-depth #\-) debug-val)))
(defun error-entry (error-list debug-frame-id)
(default-error-handler (car error-list) (cdr error-list))
(catch 'debug
(let-fluids ((frame-id debug-frame-id)
(bottom-frame-id debug-frame-id))
(print-frame debug-frame-id)
(print-emacs-frame debug-frame-id)
(debug-rep)
nil)))
(defun do-step ()
(throw 'debug (cons 1 (fluid obj))))
(defun do-set-result (value)
(throw 'debug (cons 4 value)))
(defun do-next ()
(throw 'debug (cons 2 (fluid obj))))
(defun do-continue ()
(throw 'debug (cons 3 (fluid obj))))
(defun do-up ()
(when (fluid frame-id)
(fluid-set frame-id (max 0 (1- (fluid frame-id))))
(print-frame (fluid frame-id))
(print-emacs-frame (fluid frame-id))))
(defun do-down ()
(when (fluid frame-id)
(fluid-set frame-id (1+ (fluid frame-id)))
(print-frame (fluid frame-id))
(print-emacs-frame (fluid frame-id))))
;;; initialize debug hooks (special variables)
(setq debug-entry entry)
(setq debug-exit exit)
(setq debug-error-entry error-entry))
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