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Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
From: |
Alan Mackenzie |
Subject: |
Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% |
Date: |
Fri, 3 Sep 2021 16:15:52 +0000 |
Hello, Eli.
On Fri, Sep 03, 2021 at 14:24:31 +0300, Eli Zaretskii wrote:
> > Date: Fri, 3 Sep 2021 10:47:41 +0000
> > Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
> > From: Alan Mackenzie <acm@muc.de>
> > > Bother: this is not future-proof, and certainly isn't scalable. If we
> > > are changing the protocol, can we instead come up with a more scalable
> > > change, so that functions won't "fight" in the future who gets to be
> > > "the first"?
> > I think we need to be clear about the current situation versus my
> > proposal. If there is only one element (typically
> > font-lock-fontify-region) on jit-lock-functions, nothing changes. With
> > several elements:
> > Current situation: The region marked with 'fontified text properties is
> > the _smallest_ returned by the jit-lock-functions functions. If such a
> > function returns nil (which is usual), that region becomes precisely
> > (BEG END), and we lose all the benefit of jit-lock-bounds.
> > Proposed mechanism: The region marked with 'fontified is that supplied
> > by the first j-l-f function, typically font-lock-fontify-region. This
> > is an enhancement.
> > Note that it is difficult to use the jit-lock-bounds returned by a
> > subsequent function, if they exceed the bounds returned by the first
> > function. To do this safely, we would have to re-run all the previous
> > jit-lock-functions on the newly enlarged region. This would be clumsy,
> > and wouldn't fit in well with our current scheme.
> > As for "fighting" to be the first function in j-l-f, I don't think that
> > should be a problem. We can document the new &optional parameter to
> > jit-lock-register (not yet implemented) to say "don't use this unless
> > you really know what you're doing".
> > What we have isn't scalable in the sense you mean, and I don't think it
> > can be made scalable without massive changes in the jit-lock mechanism,
> > which might well reverse the benefits of using jit-lock-bounds (the 7%
> > saving in font locking time in CC Mode (and surely other modes, too)).
> You basically say that you consider what I said not important enough
> to handle.
That's not at all what I meant to say. I'm sorry that it came out like
that.
> The only "arguments" you bring up are that you disagree with my
> assessment.
No. The matter we're discussing is somewhat complicated, and I think
we're seeing different aspects of it. That's why I wrote out in detail
what I am seeing. I don't yet see what you're seeing.
> I don't think those are useful arguments, because who said your vision
> of the future is more accurate than mine? ....
Not me. But I think winning back that 7% of fontification speed is worth
the effort. I think we're still at the stage of exploring alternatives.
Stefan has suggested one or two.
--
Alan Mackenzie (Nuremberg, Germany).
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, (continued)
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%,
Alan Mackenzie <=
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04