Reland "Include symbol properties in Object.{create,defineProperties}"

Second try; implementation that doesn't rely on external arrays.

R=mstarzinger@chromium.org
BUG=v8:3440

Review URL: https://codereview.chromium.org/391713002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@22378 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/v8natives.js

@@ -1171,13 +1171,25 @@ function ObjectDefineProperty(obj, p, attributes) {
 }
 
 
-function GetOwnEnumerablePropertyNames(properties) {
+function GetOwnEnumerablePropertyNames(object) {
   var names = new InternalArray();
-  for (var key in properties) {
-    if (%HasOwnProperty(properties, key)) {
+  for (var key in object) {
+    if (%HasOwnProperty(object, key)) {
       names.push(key);
     }
   }
+
+  // FLAG_harmony_symbols may be on, but symbols aren't included by for-in.
+  var filter = PROPERTY_ATTRIBUTES_STRING | PROPERTY_ATTRIBUTES_PRIVATE_SYMBOL;
+  var symbols = %GetOwnPropertyNames(object, filter);
+  for (var i = 0; i < symbols.length; ++i) {
+    var symbol = symbols[i];
+    if (IS_SYMBOL(symbol)) {
+      var desc = ObjectGetOwnPropertyDescriptor(object, symbol);
+      if (desc.enumerable) names.push(symbol);
+    }
+  }
+
   return names;
 }
 

test/mjsunit/es6/symbols.js

@@ -367,6 +367,34 @@ for (var i in objs) {
 }
 
 
+function TestDefineProperties() {
+  var properties = {}
+  for (var i in symbols) {
+    Object.defineProperty(
+        properties, symbols[i], {value: {value: i}, enumerable: i % 2 === 0})
+  }
+  var o = Object.defineProperties({}, properties)
+  for (var i in symbols) {
+    assertEquals(i % 2 === 0, symbols[i] in o)
+  }
+}
+TestDefineProperties()
+
+
+function TestCreate() {
+  var properties = {}
+  for (var i in symbols) {
+    Object.defineProperty(
+      properties, symbols[i], {value: {value: i}, enumerable: i % 2 === 0})
+  }
+  var o = Object.create(Object.prototype, properties)
+  for (var i in symbols) {
+    assertEquals(i % 2 === 0, symbols[i] in o)
+  }
+}
+TestCreate()
+
+
 function TestCachedKeyAfterScavenge() {
   gc();
   // Keyed property lookup are cached.  Hereby we assume that the keys are