From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: "Mattias Engdegård" <mattiase@acm.org>,
"Pip Cet" <pipcet@gmail.com>,
emacs-devel@gnu.org
Subject: Re: Bug#38708: eq vs eql in byte-compiled code
Date: Sat, 4 Jan 2020 11:33:02 -0800 [thread overview]
Message-ID: <b432f28c-b126-1edb-231d-5ab3e1b171ab@cs.ucla.edu> (raw)
In-Reply-To: <jwv5zhr5am7.fsf-monnier+emacs@gnu.org>
On 1/4/20 10:54 AM, Stefan Monnier wrote:
>> * src/alloc.c (make_pure_bignum): Remove, as we can’t copy (much
>> less purecopy) bignums any more.
> Sounds dangerous: it means that pure objects which point to bignums
> could end up with dangling pointers because the GC won't see those
> pointers and will then GC the corresponding bignum.
That dangerous thing can't happen, as the change causes purecopy to signal an
error when given a bignum. That is, bignums fall into the same category as
markers, overlays and other objects where purecopy signals an error. Since these
objects are not used in the early phase of building that calls purecopy, this
should not be an issue.
next prev parent reply other threads:[~2020-01-04 19:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-31 15:07 Bug#38708: eq vs eql in byte-compiled code Pip Cet
2019-12-31 15:51 ` Andrea Corallo
2019-12-31 16:05 ` Mattias Engdegård
2019-12-31 17:38 ` Paul Eggert
2020-01-01 12:38 ` Mattias Engdegård
2020-01-02 8:38 ` Paul Eggert
2020-01-02 17:26 ` Mattias Engdegård
2020-01-04 19:55 ` Stefan Monnier
2020-01-22 10:56 ` Mattias Engdegård
2020-01-25 0:59 ` Paul Eggert
2020-01-01 15:45 ` Stefan Monnier
2020-01-02 7:52 ` Paul Eggert
2020-01-02 12:27 ` Pip Cet
2020-01-02 23:12 ` Paul Eggert
2020-01-02 13:48 ` Eli Zaretskii
2020-01-04 18:54 ` Stefan Monnier
2020-01-04 19:33 ` Paul Eggert [this message]
2020-01-04 19:49 ` Stefan Monnier
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