Preliminary Harmony weak maps API implementation.

test/mjsunit/harmony/weakmaps.js

+// Copyright 2011 the V8 project authors. All rights reserved.
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+
+// Flags: --harmony-weakmaps
+
+
+// Test valid getter and setter calls
+var m = new WeakMap;
+assertDoesNotThrow(function () { m.get(new Object) });
+assertDoesNotThrow(function () { m.set(new Object) });
+
+
+// Test invalid getter and setter calls
+var m = new WeakMap;
+assertThrows(function () { m.get(undefined) }, TypeError);
+assertThrows(function () { m.set(undefined, 0) }, TypeError);
+assertThrows(function () { m.get(0) }, TypeError);
+assertThrows(function () { m.set(0, 0) }, TypeError);
+assertThrows(function () { m.get('a-key') }, TypeError);
+assertThrows(function () { m.set('a-key', 0) }, TypeError);
+
+
+// Test expected mapping behavior
+var m = new WeakMap;
+var key = new Object;
+var value = 'the-value';
+m.set(key, value);
+assertSame(value, m.get(key));
+
+
+// Test property attribute [[Enumerable]]
+var m = new WeakMap;
+function props(x) {
+  var array = [];
+  for (var p in x) array.push(p);
+  return array.sort();
+}
+assertArrayEquals([], props(WeakMap));
+assertArrayEquals([], props(WeakMap.prototype));
+assertArrayEquals([], props(m));
+
+
+// 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)