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bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents
From: |
Stefan Monnier |
Subject: |
bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents |
Date: |
Fri, 29 Jun 2018 16:40:15 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
>> Keep track of the first and last char actually modified (or,
>> equivalently, keep track of the number of chars unmodified at the
>> beginning and at the end, as this is often easier).
>
> Is that worth the hassle? The caller asked to replace the entire
> buffer by something else, why should they expect after-change hooks to
> be run on something other than the entire buffer?
IIUC replace-buffer-contents is meant to be used in cases where there's
a good probability that the old and new contents are almost identical,
save for a few details here and there.
So, it may very well be the case that out of the 1MB that is covered by
BEGV..ZV only 10bytes in the middle were deleted/inserted/modified, in
which case running a-c-f on those 10bytes will likely lead to
a significantly more efficient recomputation for things like font-lock.
This refinement is not indispensable, but we make this effort in pretty
much every other similar circumstance. It's usually fairly easy/cheap
to provide those tighter bounds.
Stefan
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, (continued)
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Stefan Monnier, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Stefan Monnier, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, João Távora, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/29
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, João Távora, 2018/06/30
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/30
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, João Távora, 2018/06/30
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents,
Stefan Monnier <=
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/30
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Stefan Monnier, 2018/06/30
- bug#31888: 27.0.50; Segmentation fault in replace-buffer-contents, Eli Zaretskii, 2018/06/30