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| From: | Dmitry Gutov |
| Subject: | bug#43631: 28.0.50; CC Mode multiline strings grinds performance to a halt |
| Date: | Sat, 26 Sep 2020 22:43:05 +0300 |
| User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 26.09.2020 19:17, Eli Zaretskii wrote:
But I'm confused why the "fast" profile starts with font-lock-fontify-region, whereas the "slow" profile doesn't have font-lock-fontify-region anywhere...
Because CC Mode doesn't use syntax-propertize-function (most major modes do, so we're used to seeing "slow" syntax analysis being done inside font-lock-fontify-region because it calls s-p-f).
CC Mode applies syntax properties inside before/after-change-functions, and the "slow" profile reflects that: c-before-change is featured prominently.
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