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

lib/typedObjects/utils.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 77 matching lines @@
 };
 
 /**
  * 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.
   propList.sort(function(a, b)
   {
     return b[1].referenceLength - a[1].referenceLength;
   });
 
   // Generates getters and setters for each property.
   let descriptors = {};
   for (let i = 0, l = propList.length | 0; i < l; i++)
   {
     let [name, type] = propList[i];
 
     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;
 };