src/sys-utils.lisp

   1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
   2 ;;;
   3 ;;; sys-utils.lisp --- Various utilities.
   4 ;;;
   5 ;;; Copyright (C) 2022, Stelian Ionescu <sionescu@cddr.org>
   6 ;;;
   7 ;;; Permission is hereby granted, free of charge, to any person
   8 ;;; obtaining a copy of this software and associated documentation
   9 ;;; files (the "Software"), to deal in the Software without
  10 ;;; restriction, including without limitation the rights to use, copy,
  11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies
  12 ;;; of the Software, and to permit persons to whom the Software is
  13 ;;; furnished to do so, subject to the following conditions:
  14 ;;;
  15 ;;; The above copyright notice and this permission notice shall be
  16 ;;; included in all copies or substantial portions of the Software.
  17 ;;;
  18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  21 ;;; NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  25 ;;; DEALINGS IN THE SOFTWARE.
  26 ;;;
  27
  28 (in-package #:cffi-sys)
  29
  30 (defun quoted-form-p (form)
  31   (and (proper-list-p form)
  32        (= 2 (length form))
  33        (eql 'quote (car form))))
  34
  35 (defun constant-form-p (form &optional env)
  36   (let ((form (if (symbolp form)
  37                   (macroexpand form env)
  38                   form)))
  39     (or (quoted-form-p form)
  40         (constantp form env))))
  41
  42 (defun constant-form-value (form &optional env)
  43   (declare (ignorable env))
  44   (cond
  45     ((quoted-form-p form)
  46      (second form))
  47     (t
  48      #+clozure
  49      (ccl::eval-constant form)
  50      #+sbcl
  51      (sb-int:constant-form-value form env)
  52      #-(or clozure sbcl)
  53      (eval form))))