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make backtraces prettier

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* module/system/vm/debug.scm (print-frames): Clean up a bit, reverting
  part of the previous change. (The problem was that in the else branch
  of the conditional, it didn't consume an arg.)

  In the future I would like to preserve the clean look of the
  backtraces. It's easier to read that way.
This commit is contained in:
Andy Wingo 2010-01-09 20:21:37 +01:00
parent 0af34a3f83
commit 8217c9251a
1 changed files with 8 additions and 15 deletions
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23
module/system/vm/debug.scm
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@ -109,13 +109,6 @@
out
(lp (frame-previous frame) (cons frame out) (1- count)))))))
(define (location-string file line)
(cond ((and file line)
(format #f "~:[~5_~;~5d~]" file line))
(file
(format #f "~:[~5_~" file))
(else "<unknown-location>")))
(define* (print-frames frames #:optional (port (current-output-port))
#:key (start-index (1- (length frames))) (width 72)
(full? #f))
@ -124,17 +117,17 @@
(let* ((frame (car frames))
(source (frame-source frame))
(file (and source
(or (source:file source) "<stdin>")))
(line (and=> source source:line))
(loc (location-string file line)))
(if (not (equal? file last-file))
(format port "~&In ~a:~&" (or file "current input")))
(format port "~a:~3d ~v:@y~%"
loc i width (frame-call-representation frame))
(or (source:file source)
"current input")))
(line (and=> source source:line)))
(if (and file (not (equal? file last-file)))
(format port "~&In ~a:~&" file))
(format port "~:[~*~6_~;~5d:~]~3d ~v:@y~%" line line
i width (frame-call-representation frame))
(if full?
(print-locals frame #:width width
#:per-line-prefix " "))
(lp (cdr frames) (1- i) file)))))
(lp (cdr frames) (1- i) (or file last-file))))))
;;;