Re: question about Qnil representation

[Troy Hinckley <troyhinckley@gmail.com>]

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Ah, thank you. So it is not a pointer but an index. Is lispsym array resizable or is there a static limit to the number of symbols?
On Oct 26, 2022, 10:45 AM -0600, Eli Zaretskii <eliz@gnu.org>, wrote:
> > Date: Wed, 26 Oct 2022 10:22:54 -0600
> > From: Troy Hinckley <troyhinckley@gmail.com>
> >
> > Let me try again. As I understand it, every Symbol is an instance if Lisp_Symbol. The Lisp_Object is an
> > integer that can represent multiple types with tags defined by Lisp_Type. If the tag is 0, then the type is a
> > symbol. In that case you would treat the rest of the bytes in the Lisp_Object as pointer to a Lisp_Symbol
> > instance. However if the symbol nil is defined as 0, then it is not a pointer to anything. How then do you access
> > that symbol? Is there special case code to handle the null pointer?
>
> See make_lisp_symbol and builtin_lisp_symbol, and I think you will
> understand what's going on here. Also see the value stored in
> lispsym[0].
>

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