From: "Daniel Colascione" <dancol@dancol.org>
To: "Stefan Monnier" <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] master 938d252 4/4: Make regex matching reentrant; update syntax during match
Date: Sun, 17 Jun 2018 12:50:38 -0700 [thread overview]
Message-ID: <085f38eefc8592f7b2a9a8e2a128dc1c.squirrel@dancol.org> (raw)
In-Reply-To: <jwvtvq1fbtg.fsf-monnier+gmane.emacs.devel@gnu.org>
>> Oh, yeah. One more thing. The busy flag isn't *just* to prevent the
>> regex
>> bytecode engine confusing itself with self-modifying bytecode. It also
>> serves to protect the cache slot holding the regex pattern from reuse,
>> which would be disastrous whether or not the bytecode of a particular
>> pattern happens to be mutable.
>
> It doesn't have to be disastrous *if* we complexify the code such that
> removing a pattern from the cache doesn't inevitably free that pattern ;-)
> [ But, yes, we'd still need to mark the pattern as "busy" in order to
> know when it can be freed. ]
Sure. And at that point, we might as well make compiled patterns into
GC-able heap objects. That's probably a good idea, but it's a bigger
project.
next prev parent reply other threads:[~2018-06-17 19:50 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20180616204650.8423.73499@vcs0.savannah.gnu.org>
[not found] ` <20180616204653.86AFC203CB@vcs0.savannah.gnu.org>
2018-06-17 18:42 ` [Emacs-diffs] master 938d252 4/4: Make regex matching reentrant; update syntax during match Stefan Monnier
2018-06-17 18:51 ` Daniel Colascione
2018-06-17 19:18 ` Daniel Colascione
2018-06-17 19:34 ` Stefan Monnier
2018-06-17 19:50 ` Daniel Colascione [this message]
2018-06-17 19:30 ` Stefan Monnier
2018-06-18 15:59 ` Perry E. Metzger
2018-06-18 17:49 ` Daniel Colascione
2018-06-19 13:40 ` Perry E. Metzger
2018-06-19 13:44 ` Perry E. Metzger
2018-06-19 13:49 ` Daniel Colascione
2018-06-19 14:30 ` Perry E. Metzger
2018-06-19 14:33 ` Perry E. Metzger
2018-06-19 14:48 ` Daniel Colascione
2018-06-19 15:37 ` Perry E. Metzger
2018-06-19 16:20 ` Paul Eggert
2018-06-19 16:27 ` Perry E. Metzger
2018-06-19 17:46 ` Stefan Monnier
2018-06-19 18:18 ` Daniel Colascione
2018-06-19 18:26 ` Perry E. Metzger
2018-06-19 16:54 ` John Wiegley
2018-06-19 17:04 ` Perry E. Metzger
2018-06-19 18:20 ` John Wiegley
2018-06-19 18:04 ` Paul Eggert
2018-06-19 18:16 ` Daniel Colascione
2018-06-19 18:26 ` Paul Eggert
2018-06-19 18:03 ` Andreas Schwab
2018-06-19 18:48 ` Paul Eggert
2018-06-19 14:46 ` Daniel Colascione
2018-06-19 14:58 ` Andreas Schwab
2018-06-19 15:32 ` Perry E. Metzger
2018-06-18 23:25 ` Richard Stallman
2018-06-19 1:30 ` Perry E. Metzger
2018-06-19 22:54 ` Richard Stallman
2018-06-20 1:17 ` Perry E. Metzger
2018-06-20 23:26 ` Richard Stallman
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