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struct and goops questions
From: |
Andy Wingo |
Subject: |
struct and goops questions |
Date: |
Mon, 17 Dec 2007 23:42:00 +0100 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.1.50 (gnu/linux) |
Hi all,
I've been looking at structs a bit recently, and goops' use of them. I
have some questions:
(1) Why are struct free functions part of instances and not vtables? It
would seem that they are more appropriate on the vtables (of course
themselves structs), instead of wasting a word per-instance.
(2) Why are structs double cells? It seems that the last two words are
always zero.
(3) Where does the word "entity" come from? It seems to be a term to
describe invokable objects like procedures-with-setters or generics or
something. Quite confusing, and (it seems) completely undocumented.
(4) What, on a class, are the purpose of slots h0 through h7? They seem
to be unused, and garbage (opaque foo). For example, try doing a
(slot-ref <class> 'h0) a few times -- it makes guile segfault for me.
I bet Mikael knows :)
Thanks,
Andy
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