Issue 258 - [Typed objects] Implement a garbage collection mechanism

lib/typedObjects/utils.js

Index: lib/typedObjects/utils.js
===================================================================
--- a/lib/typedObjects/utils.js
+++ b/lib/typedObjects/utils.js
@@ -90,19 +90,20 @@ let getViewsForType = exports.getViewsFo
 /**
  * Defines properties with given name and type on an object.
  *
  * @param obj object to define properties on
  * @param properties object mapping property names to their respective types
  * @param viewTypes see getViewsForType()
  * @param views see getViewsForType()
  * @param [offset] byte array offset at which the properties should start
+ * @param [cleanupValues] array of property/value combinations to be set when the object is created or destroyed
  * @return new start offset for additional properties
  */
-exports.defineProperties = function defineProperties(obj, properties, viewTypes, views, offset)
+exports.defineProperties = function defineProperties(obj, properties, viewTypes, views, offset, cleanupValues)
 {
   offset = offset | 0;
 
   let propList = [];
   for (let name in properties)
     propList.push([name, properties[name]]);
 
   // Put larger properties first to make sure alignment requirements are met.
@@ -120,15 +121,17 @@ exports.defineProperties = function defi
     let viewParams = getViewsForType(type, viewTypes, views);
     descriptors[name] = {
       get: type.createGetter.apply(type, [offset].concat(viewParams)),
       set: type.createSetter.apply(type, [offset].concat(viewParams)),
       configurable: false,
       enumerable: true
     };
     offset += type.referenceLength;
+    if (cleanupValues && typeof type.cleanupValue != "undefined")
+      cleanupValues.push([name, type.cleanupValue]);
   }
 
   // Define properties
   Object.defineProperties(obj, descriptors);
 
   return offset;
 };