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;;; compiler-macro.lisp
;;;
;;; Copyright (C) 2003-2007 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module. An independent module is a module which is not derived from
;;; or based on this library. If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so. If you do not wish to do so, delete this
;;; exception statement from your version.
(in-package "SYSTEM")
(export 'compiler-macroexpand)
(defvar *compiler-macros* (make-hash-table :test #'equal))
(defun compiler-macro-function (name &optional environment)
(declare (ignore environment))
(gethash1 name (the hash-table *compiler-macros*)))
(defun (setf compiler-macro-function) (new-function name &optional environment)
(declare (ignore environment))
(setf (gethash name (the hash-table *compiler-macros*)) new-function))
(defmacro define-compiler-macro (name lambda-list &rest body)
(let* ((form (gensym))
(env (gensym))
(block-name (fdefinition-block-name name)))
(multiple-value-bind (body decls)
(parse-defmacro lambda-list form body name 'defmacro :environment env
;; when we encounter an error
;; parsing the arguments in the call
;; (not in the difinition!), return
;; the arguments unmodified -- ie skip the
;; transform (see also source-transform.lisp)
:error-fun `(lambda (&rest ignored)
(declare (ignore ignored))
(return-from ,block-name ,form)))
(let ((expander `(lambda (,form ,env)
(declare (ignorable ,env))
(block ,block-name ,body))))
`(progn
(setf (compiler-macro-function ',name) (function ,expander))
',name)))))
;;; Adapted from OpenMCL.
(defun compiler-macroexpand-1 (form &optional env)
(let ((expander nil)
(new-form nil))
(if (and (consp form)
(symbolp (%car form))
(setq expander (compiler-macro-function (%car form) env)))
(values (setq new-form (funcall expander form env))
(neq new-form form))
(values form
nil))))
(defun compiler-macroexpand (form &optional env)
(let ((expanded-p nil))
(loop
(multiple-value-bind (expansion exp-p)
(compiler-macroexpand-1 form env)
(if exp-p
(setf form expansion
expanded-p t)
(return))))
(values form expanded-p)))
