From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Eli Zaretskii <eliz@gnu.org>
Cc: emacs-devel@gnu.org
Subject: Re: Overlays as an AA-tree
Date: Wed, 21 Sep 2016 12:24:30 -0400 [thread overview]
Message-ID: <jwv37ktgrod.fsf-monnier+Inbox@gnu.org> (raw)
In-Reply-To: <83k2e5fdmo.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 21 Sep 2016 18:58:55 +0300")
>> > Speaking of which, is the byte position stored in a marker of any
>> > significance in an overlay? Otherwise I could at least get rid of
>> > those.
>> AFAIK, the byte-position of markers is used, but the byte-position of
>> overlays isn't, so you should be able to get rid of them.
> Why bother?
AFAIK there'd be no benefit at all until/unless you add extra code to
try and use those byte-positions somewhere.
I know of two cases where we use such byte-positions, currently:
- in goto-char, but that never receives an overlay as argument.
- when converting charpos <-> bytepos (where we use the table of
markers as a kind of cache of existing translations)
The second use would probably better be served by a separate table:
- This hack of (ab)using markers can occasionally lead to bad
performance because it makes the charpos<->bytepos conversion O(N)
in the worst case where N is the number of markers which can get very
large).
- It can also lead to bad performance in the other case: lack of
markers around the "destination" makes the conversion O(N) in the
worst case where N is the size of the displacement.
Stefan
next prev parent reply other threads:[~2016-09-21 16:24 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-20 10:32 Overlays as an AA-tree Joakim Jalap
2016-09-20 12:14 ` Clément Pit--Claudel
2016-09-20 12:43 ` Lars Ingebrigtsen
2016-09-20 16:19 ` Joakim Jalap
2016-09-20 23:19 ` Richard Stallman
2016-09-20 14:40 ` Eli Zaretskii
2016-09-20 17:13 ` Joakim Jalap
2016-09-21 16:14 ` Eli Zaretskii
2016-09-22 10:35 ` Joakim Jalap
2016-09-22 12:24 ` Stefan Monnier
2016-09-21 14:52 ` Stefan Monnier
2016-09-21 15:58 ` Eli Zaretskii
2016-09-21 16:24 ` Stefan Monnier [this message]
2016-09-21 16:43 ` Eli Zaretskii
2016-09-21 18:41 ` Stefan Monnier
2016-09-21 19:28 ` Eli Zaretskii
2016-09-22 10:35 ` Joakim Jalap
2016-09-22 12:17 ` Stefan Monnier
2016-09-22 20:11 ` Joakim Jalap
2016-09-23 1:29 ` Stefan Monnier
2016-09-27 6:26 ` Joakim Jalap
2016-09-27 11:50 ` Stefan Monnier
2016-09-27 14:38 ` Eli Zaretskii
2016-09-27 16:07 ` Joakim Jalap
2016-11-21 17:32 ` Clément Pit--Claudel
2016-11-22 8:09 ` Joakim Jalap
2016-11-22 13:44 ` Stefan Monnier
2016-11-23 6:58 ` Joakim Jalap
2016-11-22 13:44 ` Clément Pit--Claudel
2016-11-22 13:55 ` Evgeny Roubinchtein
2016-11-23 7:16 ` Joakim Jalap
2016-11-23 15:42 ` Eli Zaretskii
2016-11-23 16:06 ` Stefan Monnier
2016-11-24 18:33 ` Evgeny Roubinchtein
2016-11-23 7:13 ` Joakim Jalap
2017-02-03 8:49 ` Andreas Politz
2017-02-03 9:13 ` Eli Zaretskii
2017-02-03 10:24 ` Andreas Politz
2017-02-03 11:33 ` Joakim Jalap
2017-02-03 12:44 ` Andreas Politz
2017-02-03 14:11 ` Joakim Jalap
2017-02-03 15:02 ` Andreas Politz
2017-02-03 15:23 ` Joakim Jalap
2017-02-03 15:54 ` Andreas Politz
2017-02-04 21:22 ` Stefan Monnier
2017-02-04 23:10 ` Andreas Politz
2017-02-06 9:56 ` Joakim Jalap
2017-02-06 11:33 ` Andreas Politz
2017-02-06 15:33 ` Joakim Jalap
2017-02-06 15:46 ` Stefan Monnier
2017-02-06 16:52 ` Joakim Jalap
2017-02-06 17:34 ` Stefan Monnier
2017-02-06 17:32 ` Andreas Politz
2017-02-07 12:35 ` Andreas Politz
2017-02-07 14:46 ` Joakim Jalap
2017-02-07 22:00 ` Andreas Politz
2017-02-08 0:36 ` Andreas Politz
2017-02-08 6:53 ` Joakim Jalap
2017-02-08 7:34 ` Andreas Politz
2017-02-08 8:18 ` Joakim Jalap
2017-02-08 8:44 ` Andreas Politz
2017-02-08 16:34 ` Andreas Politz
2017-02-08 17:38 ` Eli Zaretskii
2017-02-08 13:04 ` Stefan Monnier
2017-02-08 22:27 ` Andreas Politz
2017-02-08 22:34 ` Stefan Monnier
2017-02-09 9:34 ` Andreas Politz
2017-02-09 10:05 ` Joakim Jalap
2017-02-09 10:19 ` Andreas Politz
2017-02-13 3:44 ` Andreas Politz
2017-02-13 6:11 ` Eli Zaretskii
2017-02-13 9:04 ` Andreas Politz
2017-02-13 14:36 ` Eli Zaretskii
2017-02-14 10:07 ` Andreas Politz
2017-02-17 4:58 ` Andreas Politz
2017-02-17 7:12 ` Eli Zaretskii
2017-02-19 22:39 ` Andreas Politz
2017-02-19 23:10 ` Stefan Monnier
2017-02-19 23:44 ` Andreas Politz
2017-02-20 15:34 ` Eli Zaretskii
2017-02-21 6:56 ` Andreas Politz
2017-02-21 15:11 ` Stefan Monnier
2017-02-21 18:26 ` Andreas Politz
2017-02-21 19:18 ` Stefan Monnier
2017-02-21 23:36 ` Andreas Politz
2017-02-24 8:43 ` Andreas Politz
2017-04-08 13:28 ` Clément Pit-Claudel
2017-05-03 19:20 ` Andreas Politz
2017-05-03 19:40 ` Stefan Monnier
2017-05-05 20:39 ` Andreas Politz
2017-05-04 0:54 ` Clément Pit-Claudel
2017-05-05 20:10 ` Andreas Politz
2017-05-05 22:22 ` Clément Pit-Claudel
2017-05-06 8:05 ` Andreas Politz
2017-05-04 14:21 ` Eli Zaretskii
2017-05-05 20:08 ` Andreas Politz
2017-05-05 21:41 ` Eli Zaretskii
2017-09-24 13:09 ` Clément Pit-Claudel
2017-10-04 8:17 ` Andreas Politz
2017-10-04 9:22 ` Eli Zaretskii
2017-10-04 20:36 ` Andreas Politz
2017-02-14 0:45 ` Richard Stallman
2017-02-14 8:32 ` Andreas Politz
2017-02-06 13:51 ` Stefan Monnier
2017-02-06 14:26 ` Andreas Politz
2017-02-06 15:06 ` Stefan Monnier
2017-02-06 15:40 ` Joakim Jalap
2017-02-06 16:24 ` Clément Pit-Claudel
2017-02-03 13:55 ` Stefan Monnier
2017-02-03 15:14 ` Andreas Politz
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