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Need help with ad-do-it, it loops
From: |
Lennart Borgman |
Subject: |
Need help with ad-do-it, it loops |
Date: |
Fri, 8 May 2009 00:15:59 +0200 |
I have a strange case of looping in MuMaMo/nXhtml. One user (Rémi) has
this problem on Debian. This happens after starting from "emacs -Q"
and just loading nXhtml and pressing RET in the scratch buffer. The
output from the debugger says
Debugger entered--Lisp error: (error "Lisp nesting exceeds
`max-lisp-eval-depth'")
ad-Orig-syntax-ppss-flush-cache(192 192)
apply(ad-Orig-syntax-ppss-flush-cache 192 192)
...
ad-Orig-syntax-ppss-flush-cache(192 192)
apply(ad-Orig-syntax-ppss-flush-cache 192 192)
syntax-ppss-flush-cache(192 192)
self-insert-command(1)
newline(nil)
call-interactively(newline nil nil)
When Rémi set max-lisp-eval-depth to 100000 it loops a bit different:
Debugger entered--Lisp error: (error "Variable binding depth exceeds
max-specpdl-size")
ad-Orig-syntax-ppss-flush-cache(270 270)
apply(ad-Orig-syntax-ppss-flush-cache 270 270)
...
ad-Orig-syntax-ppss-flush-cache(270 270)
apply(ad-Orig-syntax-ppss-flush-cache 270 270)
syntax-ppss-flush-cache(270 270)
self-insert-command(1)
newline(nil)
call-interactively(newline nil nil)
**** I have this defadvise in mumamo.el (in buffer *Scratch*
mumamo-multi-major-mode is nil):
(defadvice syntax-ppss-flush-cache (around
mumamo-advice-syntax-ppss-flush-cache
activate
compile
)
"Support for mumamo.
See the defadvice for `syntax-ppss' for an explanation."
(if (not mumamo-multi-major-mode)
ad-do-it
(let ((pos (ad-get-arg 0)))
(let* ((chunk-at-pos (when (and (boundp 'mumamo-multi-major-mode)
mumamo-multi-major-mode)
(mumamo-find-chunks pos
"syntax-ppss-flush-cache"))))
(if chunk-at-pos
(let* ((syntax-ppss-last (overlay-get chunk-at-pos
'syntax-ppss-last))
(syntax-ppss-cache (overlay-get chunk-at-pos
'syntax-ppss-cache)))
(setq ad-return-value ad-do-it)
(overlay-put chunk-at-pos 'syntax-ppss-last syntax-ppss-last)
(overlay-put chunk-at-pos 'syntax-ppss-cache syntax-ppss-cache))
(setq ad-return-value ad-do-it))))))
I can't understand how this can loop. Any suggestions? Am I perhaps
using ad-do-it incorrectly? The manual does not explicitly say it
returns the value from the original function, but my understanding is
that it does.
(For more information see https://bugs.launchpad.net/nxhtml/+bug/369800)
- Need help with ad-do-it, it loops,
Lennart Borgman <=
- AW: Need help with ad-do-it, it loops, klaus.berndl, 2009/05/08
- Re: Need help with ad-do-it, it loops, Stefan Monnier, 2009/05/08
- Re: Need help with ad-do-it, it loops, Lennart Borgman, 2009/05/08
- Re: Need help with ad-do-it, it loops, Stefan Monnier, 2009/05/08
- Re: Need help with ad-do-it, it loops, Lennart Borgman, 2009/05/08
- Re: Need help with ad-do-it, it loops, Lennart Borgman, 2009/05/08
- Re: Need help with ad-do-it, it loops, Lennart Borgman, 2009/05/09
- Re: Need help with ad-do-it, it loops, Sven Joachim, 2009/05/09
- Re: Need help with ad-do-it, it loops, Lennart Borgman, 2009/05/09