guile-gcc/examples/birthday.scm

;;; Guile-GCC --- Guile extension to GCC.               -*- coding: utf-8 -*-
;;; Copyright (C) 2012 Ludovic Courtès
;;;
;;; This file is part of Guile-GCC.
;;;
;;; Guile-GCC 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 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Guile-GCC 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 Guile-GCC.  If not, see <http://www.gnu.org/licenses/>.

(define-module (birthday)
  #:use-module (gcc)
  #:use-module (gcc cpp))

;;;
;;; Welcome, this is the `birthday' GCC plug-in!  It extends C with a
;;; `#pragma guile birthday' construct, which says happy birthday Guile!
;;;

(define (register-funny-pragmas)
  (register-c-pragma "guile" "birthday"
                     (lambda (cpp)
                       (let ((fn (current-function-decl)))
                         (inform (token-source-location (peek-token cpp 0))
                                 "Happy Birthday Guile 2.0~:[ from function ~s~;~]!"
                                 (null-tree? fn)
                                 (identifier-string (decl-name fn)))
                         (let* ((puts (built-in-decl BUILT_IN_PUTS))
                                (str  (build-string-literal
                                       "Happy Birthday, Guile 2.0!"))
                                (call (build-call-expr %unknown-location
                                                       puts (list str))))
                           (add-statement call))))))

(format #t "Welcome!  You've just loaded the incredible birthday plug-in!~%")
(register-callback "guile" PLUGIN_PRAGMAS register-funny-pragmas)