Unify symbols sharing across native scripts and runtime.

src/string-iterator.js

 // Copyright 2014 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 ArrayIteratorCreateResultObject;
 var GlobalString = global.String;
-
-var ArrayIteratorCreateResultObject;
+var StringIteratorIteratedStringSymbol =
+  utils.GetPrivateSymbol("string_iterator_iterated_string_symbol");
+var StringIteratorNextIndexSymbol =
+  utils.GetPrivateSymbol("string_iterator_next_index_symbol");
 
 utils.Import(function(from) {
   ArrayIteratorCreateResultObject = from.ArrayIteratorCreateResultObject;
 });
 
 // -------------------------------------------------------------------
 
-var stringIteratorIteratedStringSymbol =
-    GLOBAL_PRIVATE("StringIterator#iteratedString");
-var stringIteratorNextIndexSymbol = GLOBAL_PRIVATE("StringIterator#next");
-
-
 function StringIterator() {}
 
 
 // 21.1.5.1 CreateStringIterator Abstract Operation
 function CreateStringIterator(string) {
   var s = TO_STRING_INLINE(string);
   var iterator = new StringIterator;
-  SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, s);
-  SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, 0);
+  SET_PRIVATE(iterator, StringIteratorIteratedStringSymbol, s);
+  SET_PRIVATE(iterator, StringIteratorNextIndexSymbol, 0);
   return iterator;
 }
 
 
 // 21.1.5.2.1 %StringIteratorPrototype%.next( )
 function StringIteratorNext() {
   var iterator = TO_OBJECT(this);
 
-  if (!HAS_DEFINED_PRIVATE(iterator, stringIteratorNextIndexSymbol)) {
+  if (!HAS_DEFINED_PRIVATE(iterator, StringIteratorNextIndexSymbol)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'String Iterator.prototype.next');
   }
 
-  var s = GET_PRIVATE(iterator, stringIteratorIteratedStringSymbol);
+  var s = GET_PRIVATE(iterator, StringIteratorIteratedStringSymbol);
   if (IS_UNDEFINED(s)) {
     return ArrayIteratorCreateResultObject(UNDEFINED, true);
   }
 
-  var position = GET_PRIVATE(iterator, stringIteratorNextIndexSymbol);
+  var position = GET_PRIVATE(iterator, StringIteratorNextIndexSymbol);
   var length = TO_UINT32(s.length);
 
   if (position >= length) {
-    SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol,
+    SET_PRIVATE(iterator, StringIteratorIteratedStringSymbol,
                 UNDEFINED);
     return ArrayIteratorCreateResultObject(UNDEFINED, true);
   }
 
   var first = %_StringCharCodeAt(s, position);
   var resultString = %_StringCharFromCode(first);
   position++;
 
   if (first >= 0xD800 && first <= 0xDBFF && position < length) {
     var second = %_StringCharCodeAt(s, position);
     if (second >= 0xDC00 && second <= 0xDFFF) {
       resultString += %_StringCharFromCode(second);
       position++;
     }
   }
 
-  SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, position);
+  SET_PRIVATE(iterator, StringIteratorNextIndexSymbol, position);
 
   return ArrayIteratorCreateResultObject(resultString, false);
 }
 
 
 // 21.1.3.27 String.prototype [ @@iterator ]( )
 function StringPrototypeIterator() {
   return CreateStringIterator(this);
 }
 
 //-------------------------------------------------------------------
 
 %FunctionSetPrototype(StringIterator, {__proto__: $iteratorPrototype});
 %FunctionSetInstanceClassName(StringIterator, 'String Iterator');
 
 utils.InstallFunctions(StringIterator.prototype, DONT_ENUM, [
   'next', StringIteratorNext
 ]);
 %AddNamedProperty(StringIterator.prototype, symbolToStringTag,
                   "String Iterator", READ_ONLY | DONT_ENUM);
 
 utils.SetFunctionName(StringPrototypeIterator, symbolIterator);
 %AddNamedProperty(GlobalString.prototype, symbolIterator,
                   StringPrototypeIterator, DONT_ENUM);
 
 })