+#+lispworks
+(defmacro with-cast-pointer ((binding-name pointer type) &body body)
+ `(fli:with-coerced-pointer (,binding-name
+ :type ',(convert-from-uffi-type (eval type) :type))
+ ,pointer
+ ,@body))
+
+#+(or cmu scl sbcl)
+(defmacro with-cast-pointer ((binding-name pointer type) &body body)
+ `(let ((,binding-name
+ (#+(or cmu scl) alien:cast
+ #+sbcl sb-alien:cast
+ ,pointer (* ,(convert-from-uffi-type (eval type) :type)))))
+ ,@body))
+
+#+(or allegro openmcl)
+(defmacro with-cast-pointer ((binding-name pointer type) &body body)
+ (declare (ignore type))
+ `(let ((,binding-name ,pointer))
+ ,@body))
+
+#-(or lispworks cmu scl sbcl allegro openmcl)
+(defmacro with-cast-pointer ((binding-name pointer type) &body body)
+ (declare (ignore binding-name pointer type body))
+ '(error "WITH-CAST-POINTER not (yet) implemented for ~A"
+ (lisp-implementation-type)))
+
+#+(or allegro openmcl)
+(defun convert-external-name (name)
+ "Add an underscore to NAME if necessary for the ABI."
+ #+(or macosx darwinppc-target) (concatenate 'string "_" name)
+ #-(or macosx darwinppc-target) name)
+
+(defmacro def-foreign-var (names type module)
+ #-lispworks (declare (ignore module))
+ (let ((foreign-name (if (atom names) names (first names)))
+ (lisp-name (if (atom names) (make-lisp-name names) (second names)))
+ #-allegro
+ (var-type (convert-from-uffi-type type :type)))
+ #+(or cmu scl)
+ `(alien:def-alien-variable (,foreign-name ,lisp-name) ,var-type)
+ #+sbcl
+ `(sb-alien:define-alien-variable (,foreign-name ,lisp-name) ,var-type)
+ #+allegro
+ `(define-symbol-macro ,lisp-name
+ (ff:fslot-value-typed (quote ,(convert-from-uffi-type type :deref))
+ :c (ff:get-entry-point ,(convert-external-name foreign-name))))
+ #+lispworks
+ `(progn
+ (fli:define-foreign-variable (,lisp-name ,foreign-name)
+ :accessor :address-of
+ :type ,var-type
+ :module ,module)
+ (define-symbol-macro ,lisp-name (fli:dereference (,lisp-name)
+ :copy-foreign-object nil)))
+ #+openmcl
+ `(define-symbol-macro ,lisp-name
+ (deref-pointer (ccl:foreign-symbol-address
+ ,(convert-external-name foreign-name)) ,var-type))
+ #-(or allegro cmu scl sbcl lispworks openmcl)
+ `(define-symbol-macro ,lisp-name
+ '(error "DEF-FOREIGN-VAR not (yet) defined for ~A"
+ (lisp-implementation-type)))))
+
+
+;;; Define a special variable, like DEFVAR, that will be initialized
+;;; to a pointer which may need to be reset when a saved image is
+;;; loaded. This is needed for OpenMCL, which sets pointers to "dead
+;;; macptrs" when a saved image is loaded.
+;; This may possibly be needed for sbcl's SAVE-LISP-AND-DIE
+(defmacro def-pointer-var (name value &optional doc)
+ #-openmcl `(defvar ,name ,value ,@(if doc (list doc)))
+ #+openmcl `(ccl::defloadvar ,name ,value ,doc))