Emacs just dies during fontification

Emacs just dies during fontification

[Lennart Borgman]

I have problem finding an error because Emacs just dies during
fontification when I try to call `message'. It does not happen when I
do not add the calls to `message'. (But then I do not get the info I
need.)

Anyone understands what might be going on?

Re: Emacs just dies during fontification

[Eli Zaretskii]

> From: Lennart Borgman <lennart.borgman@gmail.com>
> Date: Sun, 20 Dec 2009 03:52:01 +0100
> 
> I have problem finding an error because Emacs just dies during
> fontification when I try to call `message'. It does not happen when I
> do not add the calls to `message'. (But then I do not get the info I
> need.)
> 
> Anyone understands what might be going on?

If you mean that you added calls to `message' inside a fontification
function, then it's a no-no, because fontification functions are
called by the display engine as part of rendering the display.  A call
to `message' causes Emacs to re-enter redisplay, which again causes it
to call the fontification functions, and you then have infinite
recursion on your hands.

Re: Emacs just dies during fontification

[Stefan Monnier]

>> I have problem finding an error because Emacs just dies during
>> fontification when I try to call `message'. It does not happen when I
>> do not add the calls to `message'. (But then I do not get the info I
>> need.)

> If you mean that you added calls to `message' inside a fontification
> function, then it's a no-no, because fontification functions are
> called by the display engine as part of rendering the display.  A call
> to `message' causes Emacs to re-enter redisplay, which again causes it
> to call the fontification functions, and you then have infinite
> recursion on your hands.

It shouldn't crash, tho.  It should either ignore the call, or delay it
or something.
This said, to debug font-lock problems, (setq font-lock-support-mode nil)
has always been a very good friend of mine,


        Stefan