Unify symbols sharing across native scripts and runtime.

src/debug/mirrors.js

 // Copyright 2006-2012 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";
 
 // ----------------------------------------------------------------------------
 // Imports
 
 var FunctionSourceString;
 var GlobalArray = global.Array;
 var IsNaN = global.isNaN;
 var JSONStringify = global.JSON.stringify;
 var MathMin = global.Math.min;
+var promiseStatusSymbol = utils.GetPrivateSymbol("promise_status_symbol");
+var promiseValueSymbol = utils.GetPrivateSymbol("promise_value_symbol");
 var ToBoolean;
 var ToString;
 
 utils.Import(function(from) {
   FunctionSourceString = from.FunctionSourceString;
   ToBoolean = from.ToBoolean;
   ToString = from.ToString;
 });
 
 // ----------------------------------------------------------------------------
@@ skipping 76 matching lines @@
   mirror_cache_ = [];
 }
 
 
 // Wrapper to check whether an object is a Promise.  The call may not work
 // if promises are not enabled.
 // TODO(yangguo): remove try-catch once promises are enabled by default.
 function ObjectIsPromise(value) {
   try {
     return IS_SPEC_OBJECT(value) &&
-           !IS_UNDEFINED(%DebugGetProperty(value, builtins.$promiseStatus));
+           !IS_UNDEFINED(%DebugGetProperty(value, promiseStatusSymbol));
   } catch (e) {
     return false;
   }
 }
 
 
 /**
  * Returns the mirror for a specified value or object.
  *
  * @param {value or Object} value the value or object to retreive the mirror for
@@ skipping 1196 matching lines @@
  * @constructor
  * @extends ObjectMirror
  */
 function PromiseMirror(value) {
   %_CallFunction(this, value, MirrorType.PROMISE_TYPE, ObjectMirror);
 }
 inherits(PromiseMirror, ObjectMirror);
 
 
 function PromiseGetStatus_(value) {
-  var status = %DebugGetProperty(value, builtins.$promiseStatus);
+  var status = %DebugGetProperty(value, promiseStatusSymbol);
   if (status == 0) return "pending";
   if (status == 1) return "resolved";
   return "rejected";
 }
 
 
 function PromiseGetValue_(value) {
-  return %DebugGetProperty(value, builtins.$promiseValue);
+  return %DebugGetProperty(value, promiseValueSymbol);
 }
 
 
 PromiseMirror.prototype.status = function() {
   return PromiseGetStatus_(this.value_);
 };
 
 
 PromiseMirror.prototype.promiseValue = function() {
   return MakeMirror(PromiseGetValue_(this.value_));
@@ skipping 1759 matching lines @@
 // Functions needed by the debugger runtime.
 utils.InstallFunctions(utils, DONT_ENUM, [
   "ClearMirrorCache", ClearMirrorCache
 ]);
 
 // Export to debug.js
 utils.Export(function(to) {
   to.MirrorType = MirrorType;
 });
 })