[builtins] Migrate Object.keys to C++.

src/js/json.js

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalJSON = global.JSON;
 var GlobalSet = global.Set;
 var InternalArray = utils.InternalArray;
 var MakeTypeError;
 var MaxSimple;
 var MinSimple;
 var ObjectHasOwnProperty;
-var ObjectKeys;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
   MaxSimple = from.MaxSimple;
   MinSimple = from.MinSimple;
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
-  ObjectKeys = from.ObjectKeys;
 });
 
 // -------------------------------------------------------------------
 
 function CreateDataProperty(o, p, v) {
   var desc = {value: v, enumerable: true, writable: true, configurable: true};
   return %reflect_define_property(o, p, desc);
 }
 
 
 function InternalizeJSONProperty(holder, name, reviver) {
   var val = holder[name];
   if (IS_RECEIVER(val)) {
     if (%is_arraylike(val)) {
       var length = TO_LENGTH(val.length);
       for (var i = 0; i < length; i++) {
         var newElement =
             InternalizeJSONProperty(val, %_NumberToString(i), reviver);
         if (IS_UNDEFINED(newElement)) {
           %reflect_delete_property(val, i);
         } else {
           CreateDataProperty(val, i, newElement);
         }
       }
     } else {
-      for (var p of ObjectKeys(val)) {
+      for (var p of %object_keys(val)) {
         var newElement = InternalizeJSONProperty(val, p, reviver);
         if (IS_UNDEFINED(newElement)) {
           %reflect_delete_property(val, p);
         } else {
           CreateDataProperty(val, p, newElement);
         }
       }
     }
   }
   return %_Call(reviver, holder, name, val);
@@ skipping 50 matching lines @@
       var p = replacer[i];
       var strP = JSONSerialize(p, value, replacer, stack, indent, gap);
       if (!IS_UNDEFINED(strP)) {
         var member = %QuoteJSONString(p) + ":";
         if (gap != "") member += " ";
         member += strP;
         partial.push(member);
       }
     }
   } else {
-    for (var p of ObjectKeys(value)) {
+    for (var p of %object_keys(value)) {
       var strP = JSONSerialize(p, value, replacer, stack, indent, gap);
       if (!IS_UNDEFINED(strP)) {
         var member = %QuoteJSONString(p) + ":";
         if (gap != "") member += " ";
         member += strP;
         partial.push(member);
       }
     }
   }
   var final;
@@ skipping 117 matching lines @@
 function JsonSerializeAdapter(key, object) {
   var holder = {};
   holder[key] = object;
   // No need to pass the actual holder since there is no replacer function.
   return JSONSerialize(key, holder, UNDEFINED, new InternalArray(), "", "");
 }
 
 %InstallToContext(["json_serialize_adapter", JsonSerializeAdapter]);
 
 })