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Re: font locking problem


From: Lowell Kirsh
Subject: Re: font locking problem
Date: Fri, 07 May 2004 20:25:05 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040322

Thanks for the help. I won't post my java source here because I know that it's ok. All java files cause the same problems. Good to know about jit-lock as a replacemnet for lazy-lock. I'll be sure to give it a try.

Lowell

Alan Mackenzie wrote:
Lowell Kirsh <address@hidden> wrote on Wed, 05 May 2004 14:12:54 -0700:

Alan Mackenzie wrote:

Would you tell us your Emacs version number (M-x emacs-version) and your
CC Mode version number (M-x c-version), please.


emacs-version: 21.3.1
c-version: 5.28


OK, thanks!  These two certainly _ought_ to work sensibly together.


That's an internal coding error, probably in CC Mode.  Try setting
`debug-on-error'  (M-: (setq debug-on-error t)), then visit the file again.
That should give a stack dump.


Here's a stack dump:


Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  goto-char(nil)
  eval((goto-char (match-beginning 4)))         <====================
  font-lock-fontify-keywords-region(1 1515 t)   <====================
  font-lock-default-fontify-region(1 1515 t)
  font-lock-fontify-region(1 1515 t)
byte-code("?Ã Ä?Åed #?Æ ?Ç+Ã?" [save-match-data-internal verbose font-lock-fontified match-data ((set-match-data save-match-data-internal)) font-lock-fontify-region font-lock-after-fontify-buffer t] 4)
  font-lock-default-fontify-buffer()
  font-lock-fontify-buffer()
  font-lock-mode()
  turn-on-font-lock()
  turn-on-font-lock-if-enabled()
  global-font-lock-mode-buffers()
  run-hooks(find-file-hooks)
  after-find-file(nil t)
find-file-noselect-1(#<buffer FileTokenizer.java> "~/java/FileTokenizer.java" nil nil "~/java/FileTokenizer.java" (3385326 775))
  find-file-noselect("~/java/FileTokenizer.java" nil nil 1)
  find-file("~/java/FileTokenizer.java" 1)
  call-interactively(find-file)


Quick question:  does this problem happen with any file.java, or is it
only FileTokenizer.java which crashes?  If the latter, is there a
(java) syntactic error in this file?  [Just for clarity:  even if there
is such an error, Emacs shouldn't be bailing out on it ;-]

I've had a look at the code in font-lock.el, but can't make much of the
information in the dump.  (In particular, I can't see the connection
between the two lines of the dump I've marked with "<=======", which is
the critical bit.  Stefan, what am I missing?)

The file FileTokenizer.java is only 1515 bytes long, isn't it?  Could you
possibly post it here (or even email it to me on address@hidden), so that I
could step through it with a debugger?


So, what should I do? Work around this error until the next version comes out? I'd rather do that than build from the newest cvs source (laziness).


Yes, I can certainly empathise with you on that one.  ;-)

One thing to do would be to try with `jit-lock-mode' in place of
`lazy-lock-mode'.  jit-lock is based on the same ideas as lazy-lock.  It
was a reimplementation done after it emerged that there were fundamental
problems with lazy-lock.


Lowell




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