Prototype of mark-and-compact support for Harmony weak maps.

test/mjsunit/harmony/weakmaps.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 89 matching lines @@
   TestProperty(m, 'foo' + i, 'bar' + i);
 }
 TestMapping(m, new Object, 'foobar');
 
 
 // Test some common JavaScript idioms
 var m = new WeakMap;
 assertTrue(m instanceof WeakMap);
 assertTrue(WeakMap.prototype.set instanceof Function)
 assertTrue(WeakMap.prototype.get instanceof Function)
+
+
+// Stress Test
+// https://mail.mozilla.org/pipermail/es-discuss/2011-May/014096.html
+/*var wm = new WeakMap;
+var key = {}, value = {};
+while(true) {
+  wm.set(key, value);
+  key = value;
+  value = {};
+}*/