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;;;; "trace.scm" Utility functions and macros for tracing in Scheme.
;;; Copyright (C) 1991, 1992, 1993, 1994, 1995, 1999, 2000, 2003 Aubrey Jaffer
;
;Permission to copy this software, to modify it, to redistribute it,
;to distribute modified versions, 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 warranty 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.
(require 'alist)
(define trace:indent 0)
(define debug:call-stack '()) ;keeps track of call stack.
;@
(define debug:max-count 5)
;;Formats for call-stack elements:
;; (procedure-count name . args) ;for debug:track procedure
;; (procedure-count name) ;for debug:stack procedure
;;Traced functions also stack.
;@
(define print-call-stack
(let ((car car) (null? null?) (current-error-port current-error-port)
(qpn qpn) (for-each for-each))
(lambda cep
(set! cep (if (null? cep) (current-error-port) (car cep)))
(for-each qpn debug:call-stack))))
(define (call-stack-news? name)
(or (null? debug:call-stack)
(not (eq? name (cadar debug:call-stack)))
(< (caar debug:call-stack) debug:max-count)))
(define debug:trace-procedure
(let ((null? null?) (not not) ;These bindings are so that
(cdar cdar) (cadar cadar) ;trace will not trace parts
(car car) (cdr cdr) (caar caar) ;of itself.
(eq? eq?) (+ +) (zero? zero?) (modulo modulo)
(apply apply) (display display) (qpn qpn) (list list) (cons cons)
(CALL (string->symbol "CALL"))
(RETN (string->symbol "RETN")))
(lambda (how function . optname)
(set! trace:indent 0)
(let ((name (if (null? optname) function (car optname))))
(case how
((trace)
(lambda args
(cond ((and (not (null? args))
(eq? (car args) 'debug:untrace-object)
(null? (cdr args)))
function)
((call-stack-news? name)
(let ((cs debug:call-stack))
(set! debug:call-stack
(if (and (not (null? debug:call-stack))
(eq? name (cadar debug:call-stack)))
(cons (cons (+ 1 (caar debug:call-stack))
(cdar debug:call-stack))
(cdr debug:call-stack))
(cons (list 1 name) debug:call-stack)))
(do ((i trace:indent (+ -1 i))) ((zero? i)) (display #\ ))
(apply qpn CALL name args)
(set! trace:indent (modulo (+ 1 trace:indent) 16))
(let ((ans (apply function args)))
(set! trace:indent (modulo (+ -1 trace:indent) 16))
(do ((i trace:indent (+ -1 i))) ((zero? i)) (display #\ ))
(qpn RETN name ans)
(set! debug:call-stack cs)
ans)))
(else (apply function args)))))
((track)
(lambda args
(cond ((and (not (null? args))
(eq? (car args) 'debug:untrace-object)
(null? (cdr args)))
function)
((call-stack-news? name)
(let ((cs debug:call-stack))
(set! debug:call-stack
(if (and (not (null? debug:call-stack))
(eq? name (cadar debug:call-stack)))
(cons (cons (+ 1 (caar debug:call-stack))
(cdar debug:call-stack))
(cdr debug:call-stack))
(cons (cons 1 (cons name args))
debug:call-stack)))
(let ((ans (apply function args)))
(set! debug:call-stack cs)
ans)))
(else (apply function args)))))
((stack)
(lambda args
(cond ((and (not (null? args))
(eq? (car args) 'debug:untrace-object)
(null? (cdr args)))
function)
((call-stack-news? name)
(let ((cs debug:call-stack))
(set! debug:call-stack
(if (and (not (null? debug:call-stack))
(eq? name (cadar debug:call-stack)))
(cons (cons (+ 1 (caar debug:call-stack))
(cdar debug:call-stack))
(cdr debug:call-stack))
(cons (list 1 name) debug:call-stack)))
(let ((ans (apply function args)))
(set! debug:call-stack cs)
ans)))
(else (apply function args)))))
(else
(slib:error 'debug:trace-procedure 'unknown 'how '= how)))))))
;;; 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 (untracef function)
(set! trace: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.
(define trace:adder (alist-associator eq?))
(define trace:deler (alist-remover eq?))
(define *traced-procedures* '())
(define *tracked-procedures* '())
(define *stacked-procedures* '())
(define (trace:trace-procedure how fun sym)
(define cep (current-error-port))
(cond ((not (procedure? fun))
(display "WARNING: not a procedure " cep)
(display sym cep)
(newline cep)
(set! *traced-procedures* (trace:deler *traced-procedures* sym))
(set! *tracked-procedures* (trace:deler *tracked-procedures* sym))
(set! *stacked-procedures* (trace:deler *stacked-procedures* sym))
fun)
(else
(let ((p (assq sym (case how
((trace) *traced-procedures*)
((track) *tracked-procedures*)
((stack) *stacked-procedures*)))))
(cond ((and p (eq? (cdr p) fun))
fun)
(else
(let ((tfun (debug:trace-procedure how fun sym)))
(case how
((trace)
(set! *traced-procedures*
(trace:adder *traced-procedures* sym tfun)))
((track)
(set! *tracked-procedures*
(trace:adder *tracked-procedures* sym tfun)))
((stack)
(set! *stacked-procedures*
(trace:adder *stacked-procedures* sym tfun))))
tfun)))))))
(define (trace:untrace-procedure fun sym)
(define finish
(lambda (p)
(cond ((not (procedure? fun)) fun)
((eq? (cdr p) fun) (untracef fun))
(else fun))))
(cond ((assq sym *traced-procedures*)
=>
(lambda (p)
(set! *traced-procedures* (trace:deler *traced-procedures* sym))
(finish p)))
((assq sym *tracked-procedures*)
=>
(lambda (p)
(set! *tracked-procedures* (trace:deler *tracked-procedures* sym))
(finish p)))
((assq sym *stacked-procedures*)
=>
(lambda (p)
(set! *stacked-procedures* (trace:deler *stacked-procedures* sym))
(finish p)))
(else fun)))
;@
(define (tracef . args) (apply debug:trace-procedure 'trace args))
;@
(define (trackf . args) (apply debug:trace-procedure 'track args))
;@
(define (stackf . args) (apply debug:trace-procedure 'stack args))
;;;; Finally, the macros trace and untrace
;@
(defmacro trace xs
(if (null? xs)
`(begin (set! trace:indent 0)
,@(map (lambda (x)
`(set! ,x (trace:trace-procedure 'trace ,x ',x)))
(map car *traced-procedures*))
(map car *traced-procedures*))
`(begin ,@(map (lambda (x)
`(set! ,x (trace:trace-procedure 'trace ,x ',x))) xs))))
(defmacro track xs
(if (null? xs)
`(begin ,@(map (lambda (x)
`(set! ,x (trace:trace-procedure 'track ,x ',x)))
(map car *tracked-procedures*))
(map car *tracked-procedures*))
`(begin ,@(map (lambda (x)
`(set! ,x (trace:trace-procedure 'track ,x ',x))) xs))))
(defmacro stack xs
(if (null? xs)
`(begin ,@(map (lambda (x)
`(set! ,x (trace:trace-procedure 'stack ,x ',x)))
(map car *stacked-procedures*))
(map car *stacked-procedures*))
`(begin ,@(map (lambda (x)
`(set! ,x (trace:trace-procedure 'stack ,x ',x))) xs))))
;@
(defmacro untrace xs
(if (null? xs)
(slib:eval
`(begin ,@(map (lambda (x)
`(set! ,x (trace:untrace-procedure ,x ',x)))
(map car *traced-procedures*))
'',(map car *traced-procedures*)))
`(begin ,@(map (lambda (x)
`(set! ,x (trace:untrace-procedure ,x ',x))) xs))))
(defmacro untrack xs
(if (null? xs)
(slib:eval
`(begin ,@(map (lambda (x)
`(set! ,x (track:untrack-procedure ,x ',x)))
(map car *tracked-procedures*))
'',(map car *tracked-procedures*)))
`(begin ,@(map (lambda (x)
`(set! ,x (track:untrack-procedure ,x ',x))) xs))))
(defmacro unstack xs
(if (null? xs)
(slib:eval
`(begin ,@(map (lambda (x)
`(set! ,x (stack:unstack-procedure ,x ',x)))
(map car *stacked-procedures*))
'',(map car *stacked-procedures*)))
`(begin ,@(map (lambda (x)
`(set! ,x (stack:unstack-procedure ,x ',x))) xs))))
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