X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/944bf9362ff51217b1617f85126d26e821b8aa91..00d59354c311fb28730b7c9b117b0d91aac092cc:/src/class-make-impl.lisp

diff --git a/src/class-make-impl.lisp b/src/class-make-impl.lisp
index 02fd5f5..b3347bd 100644
--- a/src/class-make-impl.lisp
+++ b/src/class-make-impl.lisp
@@ -347,4 +347,65 @@
     (check-method-return-type-against-message type msgtype)
     (check-method-argument-lists type msgtype)))
 
+;;;--------------------------------------------------------------------------
+;;; Static instances.
+
+(defmethod shared-initialize :after
+    ((instance static-instance) slot-names &key pset)
+  "Initialize a static instance."
+  (default-slot-from-property (instance 'externp slot-names)
+      (pset :extern :boolean)
+    nil)
+  (default-slot-from-property (instance 'constp slot-names)
+      (pset :const :boolean)
+    t))
+
+(defmethod make-static-instance ((class sod-class) name initializers
+				 pset location &key)
+
+  ;; Check that the initializers are all for distinct slots.
+  (find-duplicates (lambda (initializer previous)
+		     (let ((slot (sod-initializer-slot initializer)))
+		       (cerror*-with-location initializer
+					      "Duplicate initializer for ~
+					       instance slot `~A' in ~
+					       static instance `~A'"
+					      slot name)
+		       (info-with-location previous
+					   "Previous definition was here")))
+		   initializers
+		   :key #'sod-initializer-slot)
+
+  ;; Ensure that every slot will have an initializer, either defined directly
+  ;; on the instance or as part of some class definition.
+  (let ((have (make-hash-table)))
+
+    ;; First, populate the hash table with all of the slots for which we have
+    ;; initializers.
+    (flet ((seen-slot-initializer (init)
+	     (setf (gethash (sod-initializer-slot init) have) t)))
+      (mapc #'seen-slot-initializer
+	    initializers)
+      (dolist (super (sod-class-precedence-list class))
+	(mapc #'seen-slot-initializer
+	      (sod-class-instance-initializers super))))
+
+    ;; Now go through all of the slots and check that they have initializers.
+    (dolist (super (sod-class-precedence-list class))
+      (dolist (slot (sod-class-slots super))
+	(unless (gethash slot have)
+	  (cerror*-with-location location
+				 "No initializer for instance slot `~A', ~
+				  required by static instance `~A'"
+				 slot name)
+	  (info-with-location slot "Slot `~A' defined here" slot)))))
+
+  ;; Make the instance.
+  (make-instance 'static-instance
+		 :class class
+		 :name name
+		 :initializers initializers
+		 :location (file-location location)
+		 :pset pset))
+
 ;;;----- That's all, folks --------------------------------------------------