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Re: [bug #29574] VM stack overflows aren't properly handled [1.9.10]

From: Andy Wingo
Subject: Re: [bug #29574] VM stack overflows aren't properly handled [1.9.10]
Date: Fri, 21 May 2010 13:27:43 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.92 (gnu/linux)

Hi Ludo,

> I've come up with the following hack: a small VM stack space is reserved and
> made available only upon stack overflow, so that `throw' can run to
> completion.  (See attached patch.)

The patch didn't come through the mail, and I'm in an internetless cafe,
so I can't see it now -- but it seems a somewhat sane hack.

Did you see Dybvig's paper about underflow and overflow handlers? That
does solve this problem in a more robust way, including allowing for
stack extension instead of thrown exceptions. Of course that's probably
a larger project.


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