2017-03-23 | Paul Boddie | raw annotate files changeset graph | Represent integers as __attr values with bit 0 set. Since pointers must be aligned (to four-byte boundaries on many modern systems, maybe two-byte boundaries on older or embedded systems, eight-byte boundaries on some 64-bit systems), any value with bit 0 set will not be referencing an object. This avoids allocating objects for integers and instead just allows them to be passed around. Bit 0 needs to be tested when attributes are accessed, and for integers, a common instance is employed to provide any instance attributes, an instance table reference and a reference to the integer class. | integers-as-tagged-attrs |
1 #!/usr/bin/env python 2 3 """ 4 Namespace-related functions. 5 6 Copyright (C) 2015 Paul Boddie <paul@boddie.org.uk> 7 8 This program is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free Software 10 Foundation; either version 3 of the License, or (at your option) any later 11 version. 12 13 This program is distributed in the hope that it will be useful, but WITHOUT 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 15 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 16 details. 17 18 You should have received a copy of the GNU General Public License along with 19 this program. If not, see <http://www.gnu.org/licenses/>. 20 """ 21 22 def dir(obj=None): pass 23 def globals(): pass 24 def locals(): pass 25 def vars(obj=None): pass 26 27 # vim: tabstop=4 expandtab shiftwidth=4