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Re: How can I enable tracing in a script?


From: Neil Jerram
Subject: Re: How can I enable tracing in a script?
Date: Wed, 09 Jun 2004 21:23:53 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040413 Debian/1.6-5

Eric Hanchrow wrote:

(recent CVS guile)

When I run the following script, I want to see something like
   [something 3]
   |  [something 2]
   |  |  [something 1]
   |  |  |  [something 0]
   |  |  |  0
   |  |  1
   |  3
   6

You're missing `with-traps'; see the attached script and output, which I produced with 1.6.4.

Neil

#!/usr/bin/guile \
--debug -e main -s
!#

(use-modules (ice-9 debug))
(debug-enable 'trace)
(trace-stack #t)
;;(debug-enable 'backtrace)
;;(format #t "~s~%" (debug-options))
;;(format #t "~s~%" (traps))
;;(format #t "~s~%" (evaluator-traps-interface))
;;(format #t "~s~%" (list (@@(ice-9 debug)
;;                         trace-exit)
;;                        (@@(ice-9 debug) trace-entry)))
;;(evaluator-traps-interface `( exit-frame-handler ,(@@(ice-9 debug) trace-exit 
)))
;;(evaluator-traps-interface `(apply-frame-handler ,(@@(ice-9 debug) 
trace-entry)))
;;(format #t "~s~%" (evaluator-traps-interface))
;;
;;(format (current-error-port) "This message appears on the current error 
port.~%")
;;(format #t "traced-stack-ids: ~s~%" (@@(ice-9 debug) traced-stack-ids))
;;(format #t "trace-all-stacks? ~s~%" (@@(ice-9 debug) trace-all-stacks?))

(define (something arg)
  (if (not (positive? arg))
      0
    (+ arg (something (- arg 1)))))

(define (main . args)
;;  (trace something)
  (something (string->number (list-ref (car args) 1))))

(trace something)
(with-traps
 (lambda ()
   (something 9)))

[something 9]
|  [something 8]
|  |  [something 7]
|  |  |  [something 6]
|  |  |  |  [something 5]
|  |  |  |  |  [something 4]
|  |  |  |  |  |  [something 3]
|  |  |  |  |  |  |  [something 2]
|  |  |  |  |  |  |  |  [something 1]
|  |  |  |  |  |  |  |  |  [something 0]
|  |  |  |  |  |  |  |  |  0
|  |  |  |  |  |  |  |  1
|  |  |  |  |  |  |  3
|  |  |  |  |  |  6
|  |  |  |  |  10
|  |  |  |  15
|  |  |  21
|  |  28
|  36
45
Backtrace:
In unknown file:
   ?: 0* (begin (load "./tr.scm") (main (command-line)) (quit))
   ?: 1* [main ("./tr.scm")]
In ./tr.scm:
  30: 2  [something ...
  30: 3*  [string->number ...
  30: 4*   [list-ref ("./tr.scm") 1]

./tr.scm:30:30: In procedure list-ref in expression (list-ref (car args) 1):
./tr.scm:30:30: Argument 2 out of range: 1

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