ES6: Add Object.getOwnPropertySymbols

src/symbol.js

 // Copyright 2013 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 50 matching lines @@
 function SymbolValueOf() {
   // NOTE: Both Symbol objects and values can enter here as
   // 'this'. This is not as dictated by ECMA-262.
   if (!IS_SYMBOL(this) && !IS_SYMBOL_WRAPPER(this)) {
     throw MakeTypeError(
         'incompatible_method_receiver', ["Symbol.prototype.valueOf", this]);
   }
   return %_ValueOf(this);
 }
 
+// ES6 19.1.2.8
+function ObjectGetOwnPropertySymbols(obj) {
+  if (!IS_SPEC_OBJECT(obj)) {
+    throw MakeTypeError("called_on_non_object",
+                        ["Object.getOwnPropertySymbols"]);
+  }
+
+  // TODO(arv): Proxies use a shared trap for String and Symbol keys.
+
+  return ObjectGetOwnPropertyKeys(obj, true);
+}
+
+
 //-------------------------------------------------------------------
 
 function SetUpSymbol() {
   %CheckIsBootstrapping();
 
   %SetCode($Symbol, SymbolConstructor);
   %FunctionSetPrototype($Symbol, new $Symbol());
   %SetProperty($Symbol.prototype, "constructor", $Symbol, DONT_ENUM);
 
   InstallGetter($Symbol.prototype, "name", SymbolGetName);
   InstallFunctions($Symbol.prototype, DONT_ENUM, $Array(
     "toString", SymbolToString,
     "valueOf", SymbolValueOf
   ));
 }
 
 SetUpSymbol();
+
+function ExtendObject() {
+  %CheckIsBootstrapping();
+
+  InstallFunctions($Object, DONT_ENUM, $Array(
+    "getOwnPropertySymbols", ObjectGetOwnPropertySymbols
+  ));
+}
+
+ExtendObject();