Use import/export for more functions (instead of js builtins object).

src/js/weak-collection.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) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
+// -------------------------------------------------------------------
+// Imports
+
+var GetExistingHash;
+var GetHash;
 var GlobalObject = global.Object;
 var GlobalWeakMap = global.WeakMap;
 var GlobalWeakSet = global.WeakSet;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
+utils.Import(function(from) {
+  GetExistingHash = from.GetExistingHash;
+  GetHash = from.GetHash;
+});
+
 // -------------------------------------------------------------------
 // Harmony WeakMap
 
 function WeakMapConstructor(iterable) {
   if (!%_IsConstructCall()) {
     throw MakeTypeError(kConstructorNotFunction, "WeakMap");
   }
 
   %WeakCollectionInitialize(this);
 
@@ skipping 11 matching lines @@
   }
 }
 
 
 function WeakMapGet(key) {
   if (!IS_WEAKMAP(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakMap.prototype.get', this);
   }
   if (!IS_SPEC_OBJECT(key)) return UNDEFINED;
-  var hash = $getExistingHash(key);
+  var hash = GetExistingHash(key);
   if (IS_UNDEFINED(hash)) return UNDEFINED;
   return %WeakCollectionGet(this, key, hash);
 }
 
 
 function WeakMapSet(key, value) {
   if (!IS_WEAKMAP(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakMap.prototype.set', this);
   }
   if (!IS_SPEC_OBJECT(key)) throw MakeTypeError(kInvalidWeakMapKey);
-  return %WeakCollectionSet(this, key, value, $getHash(key));
+  return %WeakCollectionSet(this, key, value, GetHash(key));
 }
 
 
 function WeakMapHas(key) {
   if (!IS_WEAKMAP(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakMap.prototype.has', this);
   }
   if (!IS_SPEC_OBJECT(key)) return false;
-  var hash = $getExistingHash(key);
+  var hash = GetExistingHash(key);
   if (IS_UNDEFINED(hash)) return false;
   return %WeakCollectionHas(this, key, hash);
 }
 
 
 function WeakMapDelete(key) {
   if (!IS_WEAKMAP(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakMap.prototype.delete', this);
   }
   if (!IS_SPEC_OBJECT(key)) return false;
-  var hash = $getExistingHash(key);
+  var hash = GetExistingHash(key);
   if (IS_UNDEFINED(hash)) return false;
   return %WeakCollectionDelete(this, key, hash);
 }
 
 
 // -------------------------------------------------------------------
 
 %SetCode(GlobalWeakMap, WeakMapConstructor);
 %FunctionSetLength(GlobalWeakMap, 0);
 %FunctionSetPrototype(GlobalWeakMap, new GlobalObject());
@@ skipping 31 matching lines @@
   }
 }
 
 
 function WeakSetAdd(value) {
   if (!IS_WEAKSET(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakSet.prototype.add', this);
   }
   if (!IS_SPEC_OBJECT(value)) throw MakeTypeError(kInvalidWeakSetValue);
-  return %WeakCollectionSet(this, value, true, $getHash(value));
+  return %WeakCollectionSet(this, value, true, GetHash(value));
 }
 
 
 function WeakSetHas(value) {
   if (!IS_WEAKSET(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakSet.prototype.has', this);
   }
   if (!IS_SPEC_OBJECT(value)) return false;
-  var hash = $getExistingHash(value);
+  var hash = GetExistingHash(value);
   if (IS_UNDEFINED(hash)) return false;
   return %WeakCollectionHas(this, value, hash);
 }
 
 
 function WeakSetDelete(value) {
   if (!IS_WEAKSET(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'WeakSet.prototype.delete', this);
   }
   if (!IS_SPEC_OBJECT(value)) return false;
-  var hash = $getExistingHash(value);
+  var hash = GetExistingHash(value);
   if (IS_UNDEFINED(hash)) return false;
   return %WeakCollectionDelete(this, value, hash);
 }
 
 
 // -------------------------------------------------------------------
 
 %SetCode(GlobalWeakSet, WeakSetConstructor);
 %FunctionSetLength(GlobalWeakSet, 0);
 %FunctionSetPrototype(GlobalWeakSet, new GlobalObject());
 %AddNamedProperty(GlobalWeakSet.prototype, "constructor", GlobalWeakSet,
                  DONT_ENUM);
 %AddNamedProperty(GlobalWeakSet.prototype, toStringTagSymbol, "WeakSet",
                   DONT_ENUM | READ_ONLY);
 
 // Set up the non-enumerable functions on the WeakSet prototype object.
 utils.InstallFunctions(GlobalWeakSet.prototype, DONT_ENUM, [
   "add", WeakSetAdd,
   "has", WeakSetHas,
   "delete", WeakSetDelete
 ]);
 
 })