Re-registering custom signals and class closures when loading saved images

[clg] / gffi / proxy.lisp

diff --git a/gffi/proxy.lisp b/gffi/proxy.lisp
index 87c05e1778435540392c3d58f24611c5d8a1e91d..12f6ec839e81e39f20f41bb31eed12912d66e5ac 100644 (file)
--- 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 1.2 2006/06/08 13:25:09 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)))
@@ -151,18 +163,20 @@ (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 cached invalidated instances in CLISP beacuse it is
+  ;; We can't cache invalidated instances in CLISP beacuse it is
   ;; not possible to cancel finalization
   #-clisp(cache-invalidated-instance instance))
 
@@ -241,14 +255,22 @@   (defmethod compute-effective-slot-definition-initargs ((class proxy-class) dir
         (call-next-method))
       (call-next-method)))
   
+  (defmethod slot-readable-p ((slotd effective-alien-slot-definition))
+    (declare (ignore slotd))
+    t)
 
-  (defmethod compute-slot-reader-function ((slotd effective-alien-slot-definition))
+  (defmethod compute-slot-reader-function ((slotd effective-alien-slot-definition) &optional signal-unbound-p)
+    (declare (ignore signal-unbound-p))
     (let* ((type (slot-definition-type slotd))
           (offset (slot-definition-offset slotd))
           (reader (reader-function type)))
       #'(lambda (object)
          (funcall reader (foreign-location object) offset))))
 
+  (defmethod slot-writable-p ((slotd effective-alien-slot-definition))
+    (declare (ignore slotd))
+    t)
+
   (defmethod compute-slot-writer-function ((slotd effective-alien-slot-definition))
     (let* ((type (slot-definition-type slotd))
           (offset (slot-definition-offset slotd))
@@ -260,7 +282,8 @@   (defmethod compute-slot-writer-function ((slotd effective-alien-slot-definitio
            (funcall writer value location offset))
          value)))
   
-  (defmethod compute-slot-reader-function ((slotd effective-virtual-alien-slot-definition))
+  (defmethod compute-slot-reader-function ((slotd effective-virtual-alien-slot-definition) &optional signal-unbound-p)
+    (declare (ignore signal-unbound-p))
     (if (and (slot-boundp slotd 'getter) (stringp (slot-definition-getter slotd)))
        (let ((getter (slot-definition-getter slotd))
              (type (slot-definition-type slotd))
@@ -279,6 +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)))
   
@@ -477,6 +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
 
@@ -560,7 +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)))))