source: trunk/abcl/src/org/armedbear/lisp/define-symbol-macro.lisp @ 14207

Last change on this file since 14207 was 13695, checked in by astalla, 9 years ago

Reimplementation of global symbol macros to avoid using the symbol's value slot.
Global symbol macros are stored on the symbols' property lists instead.
Tested with FSet which uses symbol macros quite heavily to implement and use
global lexical variables.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 2.0 KB
1;;; define-symbol-macro.lisp
3;;; Copyright (C) 2003-2004 Peter Graves
4;;; $Id: define-symbol-macro.lisp 13695 2011-11-08 23:24:05Z astalla $
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14;;; GNU General Public License for more details.
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
32(in-package "SYSTEM")
34(defun %define-symbol-macro (symbol expansion)
35  (%set-symbol-macro symbol (make-symbol-macro expansion))
36  symbol)
38(defmacro define-symbol-macro (symbol expansion)
39  (when (special-variable-p symbol) ;;TODO astalla also check local declarations?
40    (error 'program-error "~S has already been defined as a global variable." symbol))
41  `(eval-when (:compile-toplevel :load-toplevel :execute)
42     (%define-symbol-macro ',symbol ',expansion)))
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