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bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a ha
From: |
Theodor Thornhill |
Subject: |
bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt |
Date: |
Mon, 28 Sep 2020 21:41:12 +0200 |
Alan Mackenzie <acm@muc.de> writes:
> Hello, Theo.
>
[...]
>> I see that when I remove 'c-before-change-check-unbalanced-strings from
>> 'c-get-state-before-change-functions' the performance degradation
>> ceases. I'm not sure what else is affected by that change, so not sure
>> if that can be counted as a fix as far as 'csharp-mode' is concerned.
>
> I would strongly recommend you not to make such a change, at least not
> without a good deal of matching changes elsewhere. ;-)
Yeah, I put it back in some time ago ;)
>
> It seems the bit in c-b-c-check-unbalanced-strings dealing with
> multiline strings was written on the assumption that buffers containing
> such would be small.
>
> With multiline strings, _any_ change involving quote characters can flip
> the string/non-string characterisation from point all the way to the end
> of the buffer. In the worst case scenario, this potentially big region
> needs to be analysed and have syntax-table text properties throughout
> the entire region changed.
>
> The current problem is that c-b-c-check-u-strings is doing this analysis
> for every buffer change. This was easier to code, but has led to
> performance problems on buffers which aren't small. The solution to
> this will have to involve restricting this analysis to when quote marks
> or the c-multiline-string-start-char get inserted or removed. That way,
> there should only be an occasional and tolerable delay when one of these
> characters is inserted/removed.
>
> I'll be looking at this in the coming days.
>
Thats very interesting, and thanks!
--
Theo
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Theodor Thornhill, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Eli Zaretskii, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Theodor Thornhill, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Eli Zaretskii, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Theodor Thornhill, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Eli Zaretskii, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Dmitry Gutov, 2020/09/26
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Theodor Thornhill, 2020/09/27
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Theodor Thornhill, 2020/09/27
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt, Alan Mackenzie, 2020/09/28
- bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt,
Theodor Thornhill <=