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stepper.lsp
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Wrap
Lisp/Scheme
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1992-01-14
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9KB
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282 lines
;;
;; File: STEP.LSP
;; Author: Ray Comas (comas@math.lsa.umich.edu)
;;
(defmacro while (test &rest forms) `(do () ((not ,test)) ,@forms))
(defparameter *hooklevel* 0) ;create the nesting level counter.
(defvar *pdepth* 3) ;create depth counter
(defvar *plen* 3) ;create length counter
(defparameter *fcn* '*all*) ;create "one-shot" breakpoint specifier
(defvar *steplist* nil) ;create breakpoint list
(defparameter *steptrace* '(t . t)) ;create stepping flags
(defparameter *callist* nil) ;create call list for backtrace
; this macro invokes the stepper.
(defmacro step (form &aux val)
`(progn
(setq *hooklevel* 0 ;init nesting counter
*fcn* '*all* ;init break-point specifier
*steptrace* '(t . t))
(setq *callist* (list (car ',form))) ;init call list
(terpri *debug-io*)
(step-flush)
(princ *hooklevel* *debug-io*)
(princ " >==> " *debug-io*)
(prin1 ',form *debug-io*) ;print the form
(setq val (evalhook ',form ;eval, and kick off stepper
#'eval-hook-function
nil
nil))
(terpri *debug-io*)
(princ *hooklevel* *debug-io*) ;print returned value
(princ " <==< " *debug-io*)
(prin1 val *debug-io*)
(terpri *debug-io*)
val)) ;and return it
(defun eval-hook-function (form env &aux val cmd)
(setq *hooklevel* (1+ *hooklevel*)) ;incr. the nesting level
(cond ((consp form) ;if interpreted function ...
(setq *callist*
(cons (car form) *callist*)) ;add fn. to call list
(tagbody
(loop ;repeat forever ...
;check for a breakpoint
(when (and (not (equal *fcn* '*all*))
(not (equal *fcn* (car form)))
(not (and (numberp *fcn*) (>= *fcn* *hooklevel*))))
(unless (and *fcn* (member (car form) *steplist*))
;no breakpoint reached -- continue
(setf (cdr *steptrace*) nil)
(when (car *steptrace*)
(setf (cdr *steptrace*) t)
(fcprt form))
(fix-go)
(setq val (evalhook form
#'eval-hook-function
nil
env))
(go next)))
;breakpoint reached -- fix things & get a command
(fcprt form)
(setf (cdr *steptrace*) t)
(setq *fcn* '*all*) ;reset breakpoint specifier
(princ " :" *debug-io*) ;prompt user
(setq cmd ;get command from user
(char-downcase (code-char (get-key))))
;process user's command
(cond
((or (eql cmd #\n) (eql cmd #\Space)) ;step into function
(fix-go)
(setq val (evalhook form
#'eval-hook-function
nil
env))
(go next))
((or (eql cmd #\s) (eql cmd #\Newline)) ;step over function
(fix-go)
(setq val (evalhook form nil nil env))
(go next))
((eql cmd #\g) ;go until breakpt. reached
(setq *fcn* t)
(fix-go)
(setq val (evalhook form
#'eval-hook-function
nil
env))
(go next))
((eql cmd #\w) ;backtrace
(step-baktrace))
((eql cmd #\h) ;display help
(step-help))
((eql cmd #\p) ;pretty-print form
(terpri *debug-io*)
(pprint form *debug-io*))
((eql cmd #\f) ;set function breakpoint
(princ "Go to fn.: " *debug-io*)
(setq *fcn* (read *debug-io*))
(step-flush))
((eql cmd #\u) ;go up one level
(setq *fcn* (1- *hooklevel*)))
((eql cmd #\b) ;set breakpoint
(princ "Bkpt.: " *debug-io*)
(step-set-breaks (read *debug-io*))
(step-flush))
((eql cmd #\c) ;clear a breakpoint
(princ "Clear: " *debug-io*)
(step-clear-breaks (read *debug-io*))
(step-flush))
((eql cmd #\t) ;toggle trace mode
(setf (car *steptrace*)
(not (car *steptrace*)))
(princ "Trace = " *debug-io*)
(prin1 (car *steptrace*) *debug-io*))
((eql cmd #\q) ;quit stepper
(setq *fcn* nil))
((eql cmd #\x) ;evaluate a form
(princ "Eval: " *debug-io*)
(step-do-form (read *debug-io*) env)
(step-flush))
((eql cmd #\r) ;return given expression
(princ "Return: " *debug-io*)
(setq val (evalhook (read *debug-io*) nil nil env))
(step-flush)
(go next))
((eql cmd #\#) ;set new compress level
(princ "Depth: " *debug-io*)
(step-set-depth (read *debug-io*))
(step-flush))
((eql cmd #\.)
(princ "Len.: " *debug-io*)
(step-set-length (read *debug-io*))
(step-flush))
((eql cmd #\e) ;print environment
(step-print-env env))
(t (princ "Bad command. Type h for help\n" *debug-io*))))
next ;exit from loop
(setq *callist* (cdr *callist*)) ;remove fn. from call list
(when (cdr *steptrace*)
(terpri *debug-io*)
(step-spaces *hooklevel*)
(princ *hooklevel* *debug-io*)
(princ " <==< " *debug-io*) ;print the result
(prin1 val *debug-io*))))
;not an interpreted function -- just trace thru.
(t (unless (not (symbolp form))
(when (car *steptrace*)
(terpri *debug-io*)
(step-spaces *hooklevel*) ;if form is a symbol ...
(princ " " *debug-io*)
(prin1 form *debug-io*) ;... print the form ...
(princ " = " *debug-io*)))
(setq val (evalhook form nil nil env)) ;eval it
(unless (not (symbolp form))
(when (car *steptrace*)
(prin1 val *debug-io*))))) ;... and the value
(setq *hooklevel* (1- *hooklevel*)) ;decrement level
val) ;and return the value
;compress a list
(defun compress (l cd cl ol) ;cd = depth, cl = length, ol = orig. length
(cond
((null l) nil)
((eql cl 0) '(...))
((atom l) l)
((eql cd 0) '#\#)
(t (cons (compress (car l) (1- cd) ol ol)
(compress (cdr l) cd (1- cl) ol)))))
;compress and print a form
(defun fcprt (form)
(terpri *debug-io*)
(step-spaces (min 20 *hooklevel*))
(princ *hooklevel* *debug-io*)
(princ " >==> " *debug-io*)
(prin1 (compress form *pdepth* *plen* *plen*) *debug-io*)
(princ " " *debug-io*))
;a non-recursive fn to print spaces (not as elegant, easier on the gc)
(defun step-spaces (n) (dotimes (i n) (princ " " *debug-io*)))
;and one to clear the input buffer
(defun step-flush () (while (not (eql (read-char *debug-io*) #\newline))))
;print help
(defun step-help ()
(terpri *debug-io*)
(princ "Stepper Commands\n" *debug-io*)
(princ "----------------\n" *debug-io*)
(princ " n or space - next form\n" *debug-io*)
(princ " s or <cr> - step over form\n" *debug-io*)
(princ " f FUNCTION - go until FUNCTION is called\n" *debug-io*)
(princ " b FUNCTION - set breakpoint at FUNCTION\n" *debug-io*)
(princ " b <list> - set breakpoint at each function in list\n" *debug-io*)
(princ " c FUNCTION - clear breakpoint at FUNCTION\n" *debug-io*)
(princ " c <list> - clear breakpoint at each function in list\n" *debug-io*)
(princ " c *all* - clear all breakpoints\n" *debug-io*)
(princ " g - go until a breakpoint is reached\n" *debug-io*)
(princ " u - go up; continue until enclosing form is done\n" *debug-io*)
(princ " w - where am I? -- backtrace\n" *debug-io*)
(princ " t - toggle trace on/off\n" *debug-io*)
(princ " q - quit stepper, continue execution\n" *debug-io*)
(princ " p - pretty-print current form (uncompressed)\n" *debug-io*)
(princ " e - print environment\n" *debug-io*)
(princ " x <expr> - execute expression in current environment\n" *debug-io*)
(princ " r <expr> - execute and return expression\n" *debug-io*)
(princ " # nn - set print depth to nn\n" *debug-io*)
(princ " . nn - set print length to nn\n" *debug-io*)
(princ " h - print this summary\n" *debug-io*)
(terpri *debug-io*))
;evaluate a form in the given environment
(defun step-do-form (f1 env)
(step-spaces *hooklevel*)
(princ *hooklevel* *debug-io*)
(princ " res: " *debug-io*)
(prin1 (evalhook f1 nil nil env) *debug-io*)) ;print result
;set new print depth
(defun step-set-depth (cf)
(cond ((numberp cf)
(setq *pdepth* (truncate cf)))
(t (setq *pdepth* 3))))
;set new print length
(defun step-set-length (cf)
(cond ((numberp cf)
(setq *plen* (truncate cf)))
(t (setq *plen* 3))))
;print environment
(defun step-print-env (env)
(terpri *debug-io*)
(step-spaces *hooklevel*)
(princ *hooklevel* *debug-io*)
(princ " env: " *debug-io*)
(prin1 env *debug-io*)
(terpri *debug-io*))
;set breakpoints
(defun step-set-breaks (l)
(cond ((null l) t)
((symbolp l) (setq *steplist* (cons l *steplist*)))
((listp l)
(step-set-breaks (car l))
(step-set-breaks (cdr l)))))
;clear breakpoints
(defun step-clear-breaks (l)
(cond ((null l) t)
((eql l '*all*) (setq *steplist* nil))
((symbolp l) (delete l *steplist*))
((listp l)
(step-clear-breaks (car l))
(step-clear-breaks (cdr l)))))
;print backtrace
(defun step-baktrace (&aux l n)
(setq l *callist*
n *hooklevel*)
(while (>= n 0)
(terpri *debug-io*)
(step-spaces n)
(prin1 n *debug-io*)
(princ " " *debug-io*)
(prin1 (car l) *debug-io*)
(setq l (cdr l))
(setq n (1- n)))
(terpri *debug-io*))
(defun fix-go ()
(when (equal (car *callist*) 'go)
(setq *hooklevel* (1- *hooklevel*))
(setq *callist* (cdr *callist*))))