ikarus/scheme/ikarus.trace.ss

168 lines
4.6 KiB
Scheme

;;; Ikarus Scheme -- A compiler for R6RS Scheme.
;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
;;;
;;; This program is free software: you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License version 3 as
;;; published by the Free Software Foundation.
;;;
;;; This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
(library (ikarus trace)
(export make-traced-procedure)
(import (except (ikarus) make-traced-procedure))
(define k* '())
(define display-prefix
(lambda (ls t)
(unless (null? ls)
(display (if t "|" " "))
(display-prefix (cdr ls) (not t)))))
(define display-trace
(lambda (k* v)
(display-prefix k* #t)
(write v)
(newline)))
(define make-traced-procedure
(case-lambda
[(name proc) (make-traced-procedure name proc (lambda (x) x))]
[(name proc filter)
(lambda args
(call/cf
(lambda (f)
(cond
[(memq f k*) =>
(lambda (ls)
(display-trace ls (filter (cons name args)))
(apply proc args))]
[else
(display-trace (cons 1 k*) (filter (cons name args)))
(dynamic-wind
(lambda () (set! k* (cons f k*)))
(lambda ()
(call-with-values
(lambda ()
(call/cf
(lambda (nf)
(set! f nf)
(set-car! k* nf)
(apply proc args))))
(lambda v*
(display-prefix k* #t)
(unless (null? v*)
(let ([v* (filter v*)])
(write (car v*))
(let f ([v* (cdr v*)])
(unless (null? v*)
(write-char #\space)
(write (car v*))
(f (cdr v*))))))
(newline)
(apply values v*))))
(lambda () (set! k* (cdr k*))))]))))])))
#!eof
(define traced-symbols '())
(define untrace-symbol!
(lambda (s)
(define loop
(lambda (ls)
(cond
[(null? ls) '()]
[(eq? s (caar ls))
(let ([a (cdar ls)])
(when (eq? (cdr a) (symbol-value s))
(set-symbol-value! s (car a)))
(cdr ls))]
[else (cons (car ls) (loop (cdr ls)))])))
(set! traced-symbols (loop traced-symbols))))
(define trace-symbol!
(lambda (s)
(cond
[(assq s traced-symbols) =>
(lambda (pr)
(let ([a (cdr pr)] [v (symbol-value s)])
(unless (eq? (cdr a) v)
(unless (procedure? v)
(die 'trace
"the top-level value is not a procedure"
s v))
(let ([p (make-traced-procedure s v)])
(set-car! a v)
(set-cdr! a p)
(set-symbol-value! s p)))))]
[else
(unless (symbol-bound? s)
(die 'trace "unbound" s))
(let ([v (symbol-value s)])
(unless (procedure? v)
(die 'trace "the top-level value is not a procedure" s v))
(let ([p (make-traced-procedure s v)])
(set! traced-symbols
(cons (cons s (cons v p)) traced-symbols))
(set-symbol-value! s p)))])))
Try:
(trace-define fact
(lambda (n)
(if (zero? n)
1
(* n (fact (sub1 n))))))
(fact 5)
(trace-define (fact n m)
(cond
[(zero? n) m]
[else (fact (sub1 n) (* n m))]))
(fact 5 1)
(trace-define (fact n m k)
(cond
[(zero? n) (k m)]
[else (begin (fact (sub1 n) (* n m) k) 0)]))
(call/cc
(lambda (k)
(fact 6 1
(trace-lambda escape (v) (k v)))))
(call/cc
(lambda k*
(trace-define (fact n)
(cond
[(zero? n)
(call/cc
(lambda (k)
(set! k* (cons k k*))
1))]
[else (* n (fact (sub1 n)))]))
(fact 9)
(let ([k (car k*)])
(set! k* (cdr k*))
(k 100000))))
(trace-define (infinite-loop n)
(infinite-loop (add1 n)))
(infinite-loop 0)