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Re: A question about struct coding_system

From: Stefan Monnier
Subject: Re: A question about struct coding_system
Date: Mon, 21 Nov 2011 12:47:04 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.91 (gnu/linux)

> At a first glance, struct coding_system should be a vector-like
> object with src_object and dst_object at the beginning. But it
> isn't, and it looks like that src_object and dst_object are never
> marked directly. Thus, it should be guaranteed that, for any
> coding_system, objects referenced by src_object and dst_object
> are always reachable from another live objects. But I can't
> find any code that takes care about this, so I don't understand
> why and how it works at all :-(.

It may very well work just by accident (the "global" coding_system
objects have src/dst_object fields that contain globally live objects
such as nil, while the others point to objects that are also reachable
via some local variable).


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