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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.forth
Subject: Re: Implementing lisp in Forth. Chapter 4.
Date: Mon, 12 Sep 2016 13:08:39 -0700
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albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) writes:
> so as far as the garbage collector is concerned there
> is no such thing as a "root set". So please explain.

gc.fs has some words where you tell the gc what the root set is.
The data stack contents are also in the root set.  The return stack
contents are not, since there's no standard way to get at them,
but it seems worth doing that if your Forth has a way.

If you look at small Lisp implementations, their gc's also scan a
predefined root set.  I've been looking at uLisp (ulisp.com) lately
and you might find it educational.  It's about 3 kloc about 1/3 of
which is Arduino specific.