From: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Should catchlist elements be marked during GC?
Date: Thu, 13 Jul 2006 11:24:15 -0400 [thread overview]
Message-ID: <jwv8xmxczi3.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <m3u05llsu2.fsf@kfs-l.imdomain.dk> (Kim F. Storm's message of "Thu, 13 Jul 2006 12:09:09 +0200")
> During GC, we don't explicitly go through the catchlist, marking the
> TAG and VAL member of each element.
What makes you say so?
In Fgarbage_collect I see:
for (catch = catchlist; catch; catch = catch->next)
{
mark_object (catch->tag);
mark_object (catch->val);
}
> I just wondered if it is safe to assume that the TAG and VAL members
> are always marked due to some other method?
Actually, it is safe to assume so if we use conservative stack marking
because the catchlist elements are all allocated on the stack, so we
currently mark them redundantly.
The same holds for the handlerlist, the byte stacks, and the backtrace list
(but not for the specpdl array which is not allocated on the stack).
I have a patch to remove this redundant scanning, but keep it for post-22.
Stefan
next prev parent reply other threads:[~2006-07-13 15:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-13 10:09 Should catchlist elements be marked during GC? Kim F. Storm
2006-07-13 15:24 ` Stefan Monnier [this message]
2006-07-13 21:41 ` Kim F. Storm
2006-07-14 4:07 ` Richard Stallman
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