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;;;; "trace.scm" Utility macros for tracing in Scheme.
;;; Copyright (C) 1991, 1992, 1993, 1994, 1995 Aubrey Jaffer.
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
(require 'qp) ;for the qp printer.
(define debug:indent 0)
(define debug:tracef
(let ((null? null?) ;These bindings are so that
(not not) ;tracef will not trace parts
(car car) (cdr cdr) ;of itself.
(eq? eq?) (+ +) (zero? zero?) (modulo modulo)
(apply apply) (display display) (qpn qpn))
(lambda (function . optname)
(set! debug:indent 0)
(let ((name (if (null? optname) function (car optname))))
(lambda args
(cond ((and (not (null? args))
(eq? (car args) 'debug:untrace-object)
(null? (cdr args)))
function)
(else
(do ((i debug:indent (+ -1 i))) ((zero? i)) (display #\ ))
(apply qpn "CALLED" name args)
(set! debug:indent (modulo (+ 1 debug:indent) 8))
(let ((ans (apply function args)))
(set! debug:indent (modulo (+ -1 debug:indent) 8))
(do ((i debug:indent (+ -1 i))) ((zero? i)) (display #\ ))
(qpn "RETURNED" name ans)
ans))))))))
;;; the reason I use a symbol for debug:untrace-object is so
;;; that functions can still be untraced if this file is read in twice.
(define (debug:untracef function)
(set! debug:indent 0)
(function 'debug:untrace-object))
;;;;The trace: functions wrap around the debug: functions to provide
;;; niceties like keeping track of traced functions and dealing with
;;; redefinition.
(require 'alist)
(define trace:adder (alist-associator eq?))
(define trace:deler (alist-remover eq?))
(define *traced-procedures* '())
(define (trace:tracef fun sym)
(cond ((not (procedure? fun))
(display "WARNING: not a procedure " (current-error-port))
(display sym (current-error-port))
(newline (current-error-port))
(set! *traced-procedures* (trace:deler *traced-procedures* sym))
fun)
(else
(let ((p (assq sym *traced-procedures*)))
(cond ((and p (eq? (cdr p) fun))
fun)
(else
(let ((tfun (debug:tracef fun sym)))
(set! *traced-procedures*
(trace:adder *traced-procedures* sym tfun))
tfun)))))))
(define (trace:untracef fun sym)
(let ((p (assq sym *traced-procedures*)))
(set! *traced-procedures* (trace:deler *traced-procedures* sym))
(cond ((not (procedure? fun)) fun)
((not p) fun)
((eq? (cdr p) fun)
(debug:untracef fun))
(else fun))))
(define tracef debug:tracef)
(define untracef debug:untracef)
;;;; Finally, the macros trace and untrace
(defmacro trace xs
(if (null? xs)
`(begin ,@(map (lambda (x) `(set! ,x (trace:tracef ,x ',x)))
(map car *traced-procedures*))
(map car *traced-procedures*))
`(begin ,@(map (lambda (x) `(set! ,x (trace:tracef ,x ',x))) xs))))
(defmacro untrace xs
(if (null? xs)
(slib:eval
`(begin ,@(map (lambda (x) `(set! ,x (trace:untracef ,x ',x)))
(map car *traced-procedures*))
'',(map car *traced-procedures*)))
`(begin ,@(map (lambda (x) `(set! ,x (trace:untracef ,x ',x))) xs))))
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