Moved from glib

diff --git a/gffi/pcl.lisp b/gffi/pcl.lisp
new file mode 100644 (file)
index 0000000..334fc28
--- /dev/null
+++ b/gffi/pcl.lisp
@@ -0,0 +1,121 @@
+;;; *************************************************************************
+;;; Copyright (c) 1985, 1986, 1987, 1988, 1989, 1990 Xerox Corporation.
+;;; All rights reserved.
+;;;
+;;; Use and copying of this software and preparation of derivative works
+;;; based upon this software are permitted.  Any distribution of this
+;;; software or derivative works must comply with all applicable United
+;;; States export control laws.
+;;; 
+;;; This software is made available AS IS, and Xerox Corporation makes no
+;;; warranty about the software, its performance or its conformity to any
+;;; specification.
+;;; 
+;;; Any person obtaining a copy of this software is requested to send their
+;;; name and post office or electronic mail address to:
+;;;   CommonLoops Coordinator
+;;;   Xerox PARC
+;;;   3333 Coyote Hill Rd.
+;;;   Palo Alto, CA 94304
+;;; (or send Arpanet mail to CommonLoops-Coordinator.pa@Xerox.arpa)
+;;;
+;;; Suggestions, comments and requests for improvements are also welcome.
+;;; *************************************************************************
+;;;
+
+;;; Modifications for better AMOP conformance
+;;; by Espen S. Johnsen <espen@users.sf.net>
+
+
+(eval-when (:compile-toplevel :load-toplevel :execute)
+  (setf (ext:package-lock (find-package "PCL")) nil))
+
+(in-package "PCL")
+
+(defstruct slot-info
+  (name nil :type symbol)
+  ;;
+  ;; Specified slot allocation.or :INSTANCE.
+  (allocation :instance :type (or (member :class :instance) t))
+  ;;
+  ;; Specified slot type or T.
+  (type t :type (or symbol list)))
+
+
+(defmethod compute-slots :around ((class standard-class))
+  (loop with slotds = (call-next-method) and location = -1
+       for slot in slotds do
+         (setf (slot-definition-location slot)
+               (case (slot-definition-allocation slot)
+                 (:instance
+                  (incf location))
+                 (:class
+                  (let* ((name (slot-definition-name slot))
+                         (from-class (slot-definition-allocation-class slot))
+                         (cell (assq name (class-slot-cells from-class))))
+                    (assert (consp cell))
+                    cell))))
+         (initialize-internal-slot-functions slot)
+       finally
+         (return slotds)))
+
+
+
+(defun update-slots (class eslotds)
+  (collect ((instance-slots) (class-slots))
+    (dolist (eslotd eslotds)
+      (case (slot-definition-allocation eslotd)
+       (:instance (instance-slots eslotd))
+       (:class (class-slots eslotd))))
+    ;;
+    ;; If there is a change in the shape of the instances then the
+    ;; old class is now obsolete.
+    (let* ((nlayout (mapcar #'slot-definition-name
+                           (sort (instance-slots) #'<
+                                 :key #'slot-definition-location)))
+          (nslots (length nlayout))
+          (nwrapper-class-slots (compute-class-slots (class-slots)))
+          (owrapper (when (class-finalized-p class)
+                      (class-wrapper class)))
+          (olayout (when owrapper
+                     (wrapper-instance-slots-layout owrapper)))
+          (nwrapper
+           (cond ((null owrapper)
+                  (make-wrapper nslots class))
+                 ;;
+                 ;; We cannot reuse the old wrapper easily when it
+                 ;; has class slot cells, even if these cells are
+                 ;; EQUAL to the ones used in the new wrapper.  The
+                 ;; class slot cells of OWRAPPER may be referenced
+                 ;; from caches, and if we don't change the wrapper,
+                 ;; the caches won't notice that something has
+                 ;; changed.  We could do something here manually,
+                 ;; but I don't think it's worth it.
+                 ((and (equal nlayout olayout)
+                       (null (wrapper-class-slots owrapper)))
+                  owrapper)
+                 (t
+                  ;;
+                  ;; This will initialize the new wrapper to have the same
+                  ;; state as the old wrapper.  We will then have to change
+                  ;; that.  This may seem like wasted work (it is), but the
+                  ;; spec requires that we call make-instances-obsolete.
+                  (make-instances-obsolete class)
+                  (class-wrapper class)))))
+
+      (with-slots (wrapper slots finalized-p) class
+       (update-lisp-class-layout class nwrapper)
+       (setf slots eslotds
+             (wrapper-instance-slots-layout nwrapper) nlayout
+             (wrapper-class-slots nwrapper) nwrapper-class-slots
+             (wrapper-no-of-instance-slots nwrapper) nslots
+             wrapper nwrapper
+             finalized-p t))
+
+      (unless (eq owrapper nwrapper)
+       (update-inline-access class)
+       (update-pv-table-cache-info class)
+       (maybe-update-standard-class-locations class)))))
+
+
+(pushnew :non-broken-pcl *features*)