Native context: use import/export for Object observe related functions.

src/js/v8natives.js

 // Copyright 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) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
 
 var FLAG_harmony_tostring;
 var GlobalArray = global.Array;
 var GlobalBoolean = global.Boolean;
 var GlobalFunction = global.Function;
 var GlobalNumber = global.Number;
 var GlobalObject = global.Object;
 var InternalArray = utils.InternalArray;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
 var MathAbs;
+var ObserveBeginPerformSplice;
+var ObserveEndPerformSplice;
+var ObserveEnqueueSpliceRecord;
 var ProxyDelegateCallAndConstruct;
 var ProxyDerivedHasOwnTrap;
 var ProxyDerivedKeysTrap;
 var StringIndexOf;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MathAbs = from.MathAbs;
+  ObserveBeginPerformSplice = from.ObserveBeginPerformSplice;
+  ObserveEndPerformSplice = from.ObserveEndPerformSplice;
+  ObserveEnqueueSpliceRecord = from.ObserveEnqueueSpliceRecord;
   StringIndexOf = from.StringIndexOf;
 });
 
 utils.ImportFromExperimental(function(from) {
   FLAG_harmony_tostring = from.FLAG_harmony_tostring;
   ProxyDelegateCallAndConstruct = from.ProxyDelegateCallAndConstruct;
   ProxyDerivedHasOwnTrap = from.ProxyDerivedHasOwnTrap;
   ProxyDerivedKeysTrap = from.ProxyDerivedKeysTrap;
 });
 
@@ skipping 760 matching lines @@
 // ES5 section 15.4.5.1.
 function DefineArrayProperty(obj, p, desc, should_throw) {
   // Step 3 - Special handling for array index.
   if (!IS_SYMBOL(p)) {
     var index = TO_UINT32(p);
     var emit_splice = false;
     if (TO_STRING(index) == p && index != 4294967295) {
       var length = obj.length;
       if (index >= length && %IsObserved(obj)) {
         emit_splice = true;
-        $observeBeginPerformSplice(obj);
+        ObserveBeginPerformSplice(obj);
       }
 
       var length_desc = GetOwnPropertyJS(obj, "length");
       if ((index >= length && !length_desc.isWritable()) ||
           !DefineObjectProperty(obj, p, desc, true)) {
         if (emit_splice)
-          $observeEndPerformSplice(obj);
+          ObserveEndPerformSplice(obj);
         if (should_throw) {
           throw MakeTypeError(kDefineDisallowed, p);
         } else {
           return false;
         }
       }
       if (index >= length) {
         obj.length = index + 1;
       }
       if (emit_splice) {
-        $observeEndPerformSplice(obj);
-        $observeEnqueueSpliceRecord(obj, length, [], index + 1 - length);
+        ObserveEndPerformSplice(obj);
+        ObserveEnqueueSpliceRecord(obj, length, [], index + 1 - length);
       }
       return true;
     }
   }
 
   // Step 5 - Fallback to default implementation.
   return DefineObjectProperty(obj, p, desc, should_throw);
 }
 
 
@@ skipping 1002 matching lines @@
 %InstallToContext([
   "global_eval_fun", GlobalEval,
   "object_value_of", ObjectValueOf,
   "object_to_string", ObjectToString,
   "object_define_own_property", DefineOwnPropertyFromAPI,
   "object_get_own_property_descriptor", ObjectGetOwnPropertyDescriptor,
   "to_complete_property_descriptor", ToCompletePropertyDescriptor,
 ]);
 
 })