From: Bill Schottstaedt <bil@ccrma.Stanford.EDU>
Subject: GC missed a reference
Date: Mon, 26 Jan 2004 03:26:33 -0800 [thread overview]
Message-ID: <4014F969.7080409@ccrma> (raw)
Sorry about this less-than-ideal bug report, but maybe this
will make sense to someone.
In the CVS Guile, but not earlier versions (i.e. not 1.6.4 or any before that),
there is a problem with let: if you have a block with successive lets,
and these lets share a local name, you can get "GC missed a
reference":
wrong-type-arg: (- Wrong type argument in position ~A: ~S (1 #<freed cell 0x40b78e80; GC missed a reference>) #f)
The problem goes away if you rename the local variables so that there
are no shared names. The bad case is basically:
(let ...
(let ((var val)
(var1 val1))
...)
(let ((var val2)
(var1 val3))
...)) ; in this body, you can get the GC missed a ref bug
Change the second "var1" to "var2" and the error goes
away. Unfortunately, I can't seem to find a simple case of this -- my
"regression" test is more than 42000 lines long, and it's not a
completely repeatable problem even without any changes. It appears
that the 2nd binding needs to be the result of SCM_RETURN_NEWSMOB to
trigger this problem.
_______________________________________________
Bug-guile mailing list
Bug-guile@gnu.org
http://mail.gnu.org/mailman/listinfo/bug-guile
next reply other threads:[~2004-01-26 11:26 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-26 11:26 Bill Schottstaedt [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-04-25 11:09 GC missed a reference Bill Schottstaedt
2004-04-28 16:25 Bill Schottstaedt
2004-05-18 21:22 ` Marius Vollmer
2004-05-19 16:06 ` Bill Schottstaedt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/guile/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4014F969.7080409@ccrma \
--to=bil@ccrma.stanford.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).