X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/4b8e5c0347115ff30841f1d1e71afe59ecb6c82c..23e44cba8fe33e8cdde22d1ae14d78d992b9f8bb:/src/class-finalize-impl.lisp

diff --git a/src/class-finalize-impl.lisp b/src/class-finalize-impl.lisp
index b51870c..9c34bd7 100644
--- a/src/class-finalize-impl.lisp
+++ b/src/class-finalize-impl.lisp
@@ -381,12 +381,6 @@
        (with-slots (chain-head chain chains) class
 	 (setf (values chain-head chain chains) (compute-chains class)))
 
-       ;; FIXME: make these slots autovivifying.
-       (with-slots ((ilayout %ilayout) effective-methods vtables) class
-	 (setf ilayout (compute-ilayout class))
-	 (setf effective-methods (compute-effective-methods class))
-	 (setf vtables (compute-vtables class)))
-
        ;; Done.
        (setf (sod-class-state class) :finalized)
        t)
@@ -397,4 +391,18 @@
       (:finalized
        t))))
 
+(macrolet ((define-layout-slot (slot (class) &body body)
+	     `(define-on-demand-slot sod-class ,slot (,class)
+		(check-class-is-finalized ,class)
+		,@body)))
+  (flet ((check-class-is-finalized (class)
+	   (unless (eq (sod-class-state class) :finalized)
+	     (error "Class ~S is not finalized" class))))
+    (define-layout-slot %ilayout (class)
+      (compute-ilayout class))
+    (define-layout-slot effective-methods (class)
+      (compute-effective-methods class))
+    (define-layout-slot vtables (class)
+      (compute-vtables class))))
+
 ;;;----- That's all, folks --------------------------------------------------