GNU bug report logs - #68244
hash-table improvements

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From: Gerd Möllmann <gerd.moellmann <at> gmail.com>
To: 68244 <at> debbugs.gnu.org
Cc: mattias.engdegard <at> gmail.com, dmitry <at> gutov.dev, monnier <at> iro.umontreal.ca, eliz <at> gnu.org, stefankangas <at> gmail.com
Subject: bug#68244: hash-table improvements
Date: Thu, 08 Feb 2024 15:36:51 +0100

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs <at> gnu.org> writes:

> But I think we can do something much simpler: vectors are accepted by
> simply storing in the first field a reference to the actual obarray
> object, so there's no need to play any games and/or share representation
> between vectors and obarray.

Fun fact:

  static Lisp_Object
  pkg_fake_me_an_obarray (Lisp_Object vector)
  {
    eassert (VECTORP (vector));
    Lisp_Object package = Faref (vector, make_fixnum (0));
    if (!PACKAGEP (package))
      {
        package = pkg_make_package (build_string ("obarray"),
                                    Flength (vector));
        Faset (vector, make_fixnum (0), package);
      }
    return package;
  }

Works like a charm :-). And the next pointer in Lisp_Symbol is also
gone.

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