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 --expose-gc
+
+
+// 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;
+function TestMapping(map, key, value) {
+  map.set(key, value);
+  assertSame(value, map.get(key));
+}
+TestMapping(m, new Object, 23);
+TestMapping(m, new Object, 'the-value');
+TestMapping(m, new Object, new Object);
+
+
+// Test GC of map with entry
+var m = new WeakMap;
+var key = new Object;
+m.set(key, 'not-collected');
+gc();
+assertSame('not-collected', m.get(key));
+
+
+// Test GC of map with chained entries
+var m = new WeakMap;
+var head = new Object;
+for (key = head, i = 0; i < 10; i++, key = m.get(key)) {
+  m.set(key, new Object);
+}
+gc();
+var count = 0;
+for (key = head; key != undefined; key = m.get(key)) {
+  count++;
+}
+assertEquals(11, count);
+
+
+// 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 arbitrary properties on weak maps
+var m = new WeakMap;
+function TestProperty(map, property, value) {
+  map[property] = value;
+  assertEquals(value, map[property]);
+}
+for (i = 0; i < 20; i++) {
+  TestProperty(m, i, 'val' + i);
+  TestProperty(m, 'foo' + i, 'bar' + i);
+}
+TestMapping(m, new Object, 'foobar');
+
+
+// Test direct constructor call
+var m = WeakMap();
+assertTrue(m instanceof WeakMap);
+
+
+// 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)