tests/stress/generational-opaque-roots.js

   1 // Tests that opaque roots behave correctly during young generation collections
   2
   3 // Create the primary Root.
   4 var root = new Root();
   5 // This secondary root is for allocating a second Element without overriding
   6 // the primary Root's Element.
   7 var otherRoot = new Root();
   8
   9 // Run an Eden collection so that the Root will be in the old gen (and won't be rescanned).
  10 edenGC();
  11
  12 // Create a new Element and set a custom property on it.
  13 var elem = new Element(root);
  14 elem.customProperty = "hello";
  15
  16 // Make the Element unreachable except through the ephemeron with the Root.
  17 elem = null;
  18
  19 // Create another Element so that we process the weak handles in block of the original Element.
  20 var test = new Element(otherRoot);
  21
  22 // Run another Eden collection to process the weak handles in the Element's block. If opaque roots
  23 // are cleared then we'll think that the original Element is dead because the Root won't be in the
  24 // set of opaque roots.
  25 edenGC();
  26
  27 // Check if the primary Root's Element exists and has our custom property.
  28 var elem = getElement(root);
  29 if (elem.customProperty != "hello")
  30     throw new Error("bad value of customProperty: " + elem.customProperty);