1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
;;;; "break.scm" Breakpoints for debugging in Scheme.
;;; Copyright (C) 1991, 1992, 1993, 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)
;;;; BREAKPOINTS
;;; Typing (init-debug) at top level sets up a continuation for
;;; breakpoint. When (breakpoint arg1 ...) is then called it returns
;;; from the top level continuation and pushes the continuation from
;;; which it was called on breakpoint:continuation-stack. If
;;; (continue) is later called, it pops the topmost continuation off
;;; of breakpoint:continuation-stack and returns #f to it.
(define breakpoint:continuation-stack '())
(define debug:breakpoint
(let ((call-with-current-continuation call-with-current-continuation)
(apply apply) (qpn qpn)
(cons cons) (length length))
(lambda args
(apply qpn "BREAKPOINT:" args)
(let ((ans
(call-with-current-continuation
(lambda (x)
(set! breakpoint:continuation-stack
(cons x breakpoint:continuation-stack))
(debug:top-continuation
(length breakpoint:continuation-stack))))))
(cond ((not (eq? ans breakpoint:continuation-stack)) ans))))))
(define debug:continue
(let ((null? null?) (car car) (cdr cdr))
(lambda args
(cond ((null? breakpoint:continuation-stack)
(display "; no break to continue from")
(newline))
(else
(let ((cont (car breakpoint:continuation-stack)))
(set! breakpoint:continuation-stack
(cdr breakpoint:continuation-stack))
(if (null? args) (cont #f)
(apply cont args))))))))
(define debug:top-continuation
(if (provided? 'abort)
(lambda (val) (display val) (newline) (abort))
(begin (display "; type (init-debug)") #f)))
(define (init-debug)
(call-with-current-continuation
(lambda (x) (set! debug:top-continuation x))))
(define breakpoint debug:breakpoint)
(define bkpt debug:breakpoint)
(define continue debug:continue)
(define debug:breakf
(let ((null? null?) ;These bindings are so that
(not not) ;breakf will not break on parts
(car car) (cdr cdr) ;of itself.
(eq? eq?) (+ +) (zero? zero?) (modulo modulo)
(apply apply) (display display) (breakpoint debug:breakpoint))
(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:unbreak-object)
(null? (cdr args)))
function)
(else
(breakpoint name args)
(apply function args))))))))
;;; the reason I use a symbol for debug:unbreak-object is so
;;; that functions can still be unbreaked if this file is read in twice.
(define (debug:unbreakf function)
;;; (set! debug:indent 0)
(function 'debug:unbreak-object))
;;;;The break: functions wrap around the debug: functions to provide
;;; niceties like keeping track of breakd functions and dealing with
;;; redefinition.
(require 'alist)
(define break:adder (alist-associator eq?))
(define break:deler (alist-remover eq?))
(define *breakd-procedures* '())
(define (break:breakf fun sym)
(cond ((not (procedure? fun))
(display "WARNING: not a procedure " (current-error-port))
(display sym (current-error-port))
(newline (current-error-port))
(set! *breakd-procedures* (break:deler *breakd-procedures* sym))
fun)
(else
(let ((p (assq sym *breakd-procedures*)))
(cond ((and p (eq? (cdr p) fun))
fun)
(else
(let ((tfun (debug:breakf fun sym)))
(set! *breakd-procedures*
(break:adder *breakd-procedures* sym tfun))
tfun)))))))
(define (break:unbreakf fun sym)
(let ((p (assq sym *breakd-procedures*)))
(set! *breakd-procedures* (break:deler *breakd-procedures* sym))
(cond ((not (procedure? fun)) fun)
((not p) fun)
((eq? (cdr p) fun)
(debug:unbreakf fun))
(else fun))))
(define breakf debug:breakf)
(define unbreakf debug:unbreakf)
;;;; Finally, the macros break and unbreak
(defmacro break xs
(if (null? xs)
`(begin ,@(map (lambda (x) `(set! ,x (break:breakf ,x ',x)))
(map car *breakd-procedures*))
(map car *breakd-procedures*))
`(begin ,@(map (lambda (x) `(set! ,x (break:breakf ,x ',x))) xs))))
(defmacro unbreak xs
(if (null? xs)
(slib:eval
`(begin ,@(map (lambda (x) `(set! ,x (break:unbreakf ,x ',x)))
(map car *breakd-procedures*))
'',(map car *breakd-procedures*)))
`(begin ,@(map (lambda (x) `(set! ,x (break:unbreakf ,x ',x))) xs))))
|
