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Common Lisp implementation running on the JVM
;;; proclaim.lisp
;;;
;;; Copyright (C) 2003-2006 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 '(check-declaration-type proclaimed-type proclaimed-ftype ftype-result-type *inline-declarations*))
(defmacro declaim (&rest decls)
`(eval-when (:compile-toplevel :load-toplevel :execute)
,@(mapcar (lambda (decl) `(proclaim ',decl))
decls)))
(defun declaration-error (name)
(error 'simple-error
:format-control "The symbol ~S cannot be both the name of a type and the name of a declaration."
:format-arguments (list name)))
(defvar *inline-declarations* nil)
(defvar *declaration-types* (make-hash-table :test 'eq))
;; "A symbol cannot be both the name of a type and the name of a declaration.
;; Defining a symbol as the name of a class, structure, condition, or type,
;; when the symbol has been declared as a declaration name, or vice versa,
;; signals an error."
(defun check-declaration-type (name)
(when (gethash1 name (the hash-table *declaration-types*))
(declaration-error name)))
(defun proclaim (declaration-specifier)
(unless (symbolp (car declaration-specifier))
(%type-error (car declaration-specifier) 'symbol))
;; (cdr declaration-specifier) must be a proper list.
(unless (listp (cddr declaration-specifier))
(%type-error (cddr declaration-specifier) 'list))
(case (car declaration-specifier)
(SPECIAL
(dolist (name (cdr declaration-specifier))
(%defvar name)))
(OPTIMIZE
(dolist (spec (cdr declaration-specifier))
(let ((val 3)
(quality spec))
(when (consp spec)
(setf quality (%car spec)
val (cadr spec)))
(when (and (fixnump val)
(<= 0 val 3))
(case quality
(SPEED
(setf *speed* val))
(SPACE
(setf *space* val))
(SAFETY
(setf *safety* val))
(DEBUG
(setf *debug* val)))))))
(FTYPE
(unless (cdr declaration-specifier)
(error "No type specified in FTYPE declaration: ~S" declaration-specifier))
(apply 'proclaim-ftype (cdr declaration-specifier)))
(TYPE
(unless (cdr declaration-specifier)
(error "No type specified in TYPE declaration: ~S" declaration-specifier))
(apply 'proclaim-type (cdr declaration-specifier)))
((INLINE NOTINLINE)
(dolist (name (cdr declaration-specifier))
(if (symbolp name)
(setf (get name '%inline) (car declaration-specifier))
(push (cons name (car declaration-specifier)) *inline-declarations*))))
(DECLARATION
(dolist (name (cdr declaration-specifier))
(when (or (get name 'deftype-definition)
(find-class name nil))
(declaration-error name))
(setf (gethash name (the hash-table *declaration-types*)) name)))
(:explain
(dolist (spec (cdr declaration-specifier))
(let ((val t)
(quality spec))
(when (consp spec)
(setf quality (%car spec))
(when (= (length spec) 2)
(setf val (%cadr spec))))
(if val
(pushnew quality *explain*)
(setf *explain* (remove quality *explain*))))))))
(defun proclaim-type (type &rest names)
(dolist (name names)
(setf (get name 'proclaimed-type) type)))
(defun proclaimed-type (name)
(get name 'proclaimed-type))
(declaim (type hash-table *proclaimed-ftypes*))
(defconst *proclaimed-ftypes* (make-hash-table :test 'equal))
(declaim (inline proclaim-ftype-1))
(defun proclaim-ftype-1 (ftype name)
(declare (optimize speed))
(if (symbolp name)
(setf (get name 'proclaimed-ftype) ftype)
(setf (gethash name *proclaimed-ftypes*) ftype)))
(declaim (notinline proclaim-ftype-1))
(defun proclaim-ftype (ftype &rest names)
(declare (optimize speed))
(declare (inline proclaim-ftype-1))
(dolist (name names)
(proclaim-ftype-1 ftype name)))
(defun proclaimed-ftype (name)
(if (symbolp name)
(get name 'proclaimed-ftype)
(gethash1 name *proclaimed-ftypes*)))
(defun ftype-result-type (ftype)
(if (atom ftype)
'*
(let ((result-type (third ftype)))
(if result-type
result-type
'*))))