X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/clg/blobdiff_plain/2bd78f93f681c3afb5b555265ae3831fbe3ba017..8f49b7a10a9717890ca98dff2b01799b80ce2761:/gffi/proxy.lisp

diff --git a/gffi/proxy.lisp b/gffi/proxy.lisp
index 9cf15ca..7ce9f05 100644
--- a/gffi/proxy.lisp
+++ b/gffi/proxy.lisp
@@ -20,7 +20,7 @@
 ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-;; $Id: proxy.lisp,v 1.4 2006-08-16 12:09:03 espen Exp $
+;; $Id: proxy.lisp,v 1.10 2007-12-11 14:26:11 espen Exp $
 
 (in-package "GFFI")
 
@@ -83,13 +83,14 @@ (defun list-invalidated-instances ()
 
 ;;;; Proxy for alien instances
 
-#+clisp
-(defvar *foreign-instance-locations* (make-hash-table :weak :key))
+#?(or (sbcl>= 0 9 17) (featurep :clisp))
+(defvar *foreign-instance-locations* 
+  (make-hash-table #+clisp :weak #+sbcl :weakness :key))
+
 
-;; TODO: add a ref-counted-proxy subclass
 (eval-when (:compile-toplevel :load-toplevel :execute)
   (defclass proxy (virtual-slots-object)
-    (#-clisp(location :special t :type pointer))
+    (#?-(or (sbcl>= 0 9 17) (featurep :clisp))(%location :special t :type pointer))
     (:metaclass virtual-slots-class)))
 
 (defgeneric instance-finalizer (instance))
@@ -98,17 +99,28 @@ (defgeneric unreference-function (class))
 (defgeneric invalidate-instance (instance &optional finalize-p))
 (defgeneric allocate-foreign (object &key &allow-other-keys))
 
-(defun foreign-location (instance)
-  #-clisp(slot-value instance 'location)
-  #+clisp(gethash instance *foreign-instance-locations*))
+#?-(or (sbcl>= 0 9 17) (featurep :clisp))
+(progn
+  (defun foreign-location (instance)
+    (slot-value instance '%location))
+
+  (defun (setf foreign-location) (location instance)
+    (setf (slot-value instance '%location) location))
+  
+  (defun proxy-valid-p (instance)
+    (slot-boundp instance '%location)))
+  
+#?(or (sbcl>= 0 9 17) (featurep :clisp))
+(progn
+  (defun foreign-location (instance)
+    (gethash instance *foreign-instance-locations*))
+
+  (defun (setf foreign-location) (location instance)
+    (setf (gethash instance *foreign-instance-locations*) location))
 
-(defun (setf foreign-location) (location instance)
-  #-clisp(setf (slot-value instance 'location) location)
-  #+clisp(setf (gethash instance *foreign-instance-locations*) location))
+  (defun proxy-valid-p (instance)
+    (and (gethash instance *foreign-instance-locations*) t)))
 
-(defun proxy-valid-p (instance)
-  #-clisp(slot-boundp instance 'location)
-  #+clisp(and (gethash instance *foreign-instance-locations*) t))
 
 (defmethod reference-function ((name symbol))
   (reference-function (find-class name)))
@@ -151,16 +163,18 @@ (defmethod instance-finalizer ((instance proxy))
     #'(lambda ()
 	(funcall unref location))))
 
-;; FINALIZE-P should always be given the same value as the keyword
-;; argument :FINALZIE given to MAKE-PROXY-INSTANCE or non NIL if the
-;; proxy was created with MAKE-INSTANCE
+;; FINALIZE-P should always be the same as the keyword argument
+;; :FINALZIE given to MAKE-PROXY-INSTANCE or non NIL if the proxy was
+;; created with MAKE-INSTANCE
 (defmethod invalidate-instance ((instance proxy) &optional finalize-p)
+  #+clisp(declare (ignore finalize-p))
   (remove-cached-instance (foreign-location instance))
   #+(or sbcl cmu)
   (progn
     (when finalize-p
       (funcall (instance-finalizer instance)))
-    (slot-makunbound instance 'location)
+    #?-(sbcl>= 0 9 17)(slot-makunbound instance '%location)
+    #?(sbcl>= 0 9 17)(remhash instance *foreign-instance-locations*)
     (cancel-finalization instance))
   ;; We can't cache invalidated instances in CLISP beacuse it is
   ;; not possible to cancel finalization
@@ -288,6 +302,8 @@   (defmethod compute-slot-writer-function ((slotd effective-virtual-alien-slot-d
 	  #'(lambda (value object)
  	      (unless writer
  		(setq writer (mkbinding setter nil 'pointer type)))
+	      ;; First argument in foreign setters is the object and second
+	      ;; is value
 	      (funcall writer (foreign-location object) value)))
       (call-next-method)))
   
@@ -486,6 +502,20 @@ (defmethod make-proxy-instance ((class proxy-class) location
     (cache-instance instance)
     instance))
 
+;;;; Superclass for ref-counted objects
+
+(defclass ref-counted-object (proxy)
+  ()
+  (:metaclass proxy-class))
+
+(define-type-method from-alien-form ((type ref-counted-object) form 
+				     &key (ref :copy))
+  (call-next-method type form :ref ref))
+
+(define-type-method from-alien-function ((type ref-counted-object) 
+					 &key (ref :copy))
+  (call-next-method type :ref ref))
+
 
 ;;;; Superclasses for wrapping of C structures
 
@@ -569,7 +599,7 @@ (defmethod compute-slots :around ((class struct-class))
 
 (define-type-method callback-wrapper ((type struct) var arg form)
   (let ((class (type-expand type)))
-    `(let ((,var (ensure-proxy-instance ',class ,arg :finalize nil)))
+    `(let ((,var (ensure-proxy-instance ',class ,arg :reference nil :finalize nil)))
        (unwind-protect
 	   ,form
 	 (invalidate-instance ,var)))))