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 /* Native functions for character set conversion. 2 3 Copyright (C) 2016 Paul Boddie <paul@boddie.org.uk> 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License as published by the Free Software 7 Foundation; either version 3 of the License, or (at your option) any later 8 version. 9 10 This program is distributed in the hope that it will be useful, but WITHOUT 11 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 12 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 13 details. 14 15 You should have received a copy of the GNU General Public License along with 16 this program. If not, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #ifndef __NATIVE_ICONV_H__ 20 #define __NATIVE_ICONV_H__ 21 22 #include "types.h" 23 24 /* Input/output. */ 25 26 __attr __fn_native_iconv_iconv(__attr __args[]); 27 __attr __fn_native_iconv_iconv_close(__attr __args[]); 28 __attr __fn_native_iconv_iconv_open(__attr __args[]); 29 __attr __fn_native_iconv_iconv_reset(__attr __args[]); 30 31 /* Module initialisation. */ 32 33 void __main_native_iconv(); 34 35 #endif /* __NATIVE_ICONV_H__ */