Call JS functions via native context instead of js builtins object.

src/prologue.js

 // Copyright 2015 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();
 
 // -----------------------------------------------------------------------
 // Utils
 
 var imports = UNDEFINED;
 var imports_from_experimental = UNDEFINED;
-var exports_to_runtime = UNDEFINED;
 var exports_container = {};
 
 // Export to other scripts.
 // In normal natives, this exports functions to other normal natives.
 // In experimental natives, this exports to other experimental natives and
 // to normal natives that import using utils.ImportFromExperimental.
 function Export(f) {
   f(exports_container);
 }
 
 
-// Export to the native context for calls from the runtime.
-function ExportToRuntime(f) {
-  f.next = exports_to_runtime;
-  exports_to_runtime = f;
-}
-
-
 // Import from other scripts. The actual importing happens in PostNatives and
 // PostExperimental so that we can import from scripts executed later. However,
 // that means that the import is not available until the very end. If the
 // import needs to be available immediate, use ImportNow.
 // In normal natives, this imports from other normal natives.
 // In experimental natives, this imports from other experimental natives and
 // whitelisted exports from normal natives.
 function Import(f) {
   f.next = imports;
   imports = f;
@@ skipping 121 matching lines @@
 // -----------------------------------------------------------------------
 // To be called by bootstrapper
 
 function PostNatives(utils) {
   %CheckIsBootstrapping();
 
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
 
-  var runtime_container = {};
-  for ( ; !IS_UNDEFINED(exports_to_runtime);
-          exports_to_runtime = exports_to_runtime.next) {
-    exports_to_runtime(runtime_container);
-  }
-  %ImportToRuntime(runtime_container);
-
   // Whitelist of exports from normal natives to experimental natives and debug.
   var expose_list = [
     "ArrayToString",
     "FunctionSourceString",
     "GetIterator",
     "GetMethod",
     "InnerArrayEvery",
     "InnerArrayFilter",
     "InnerArrayForEach",
     "InnerArrayIndexOf",
@@ skipping 35 matching lines @@
 function PostExperimentals(utils) {
   %CheckIsBootstrapping();
 
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
   for ( ; !IS_UNDEFINED(imports_from_experimental);
           imports_from_experimental = imports_from_experimental.next) {
     imports_from_experimental(exports_container);
   }
-  var runtime_container = {};
-  for ( ; !IS_UNDEFINED(exports_to_runtime);
-          exports_to_runtime = exports_to_runtime.next) {
-    exports_to_runtime(runtime_container);
-  }
-  %ImportExperimentalToRuntime(runtime_container);
 
   exports_container = UNDEFINED;
   private_symbols = UNDEFINED;
 
   utils.PostExperimentals = UNDEFINED;
   utils.PostDebug = UNDEFINED;
   utils.Import = UNDEFINED;
   utils.Export = UNDEFINED;
 }
 
 
 function PostDebug(utils) {
   for ( ; !IS_UNDEFINED(imports); imports = imports.next) {
     imports(exports_container);
   }
 
   exports_container = UNDEFINED;
   private_symbols = UNDEFINED;
 
   utils.PostDebug = UNDEFINED;
   utils.PostExperimentals = UNDEFINED;
   utils.Import = UNDEFINED;
   utils.Export = UNDEFINED;
 }
 
 // -----------------------------------------------------------------------
 
-%OptimizeObjectForAddingMultipleProperties(utils, 15);
+%OptimizeObjectForAddingMultipleProperties(utils, 14);
 
 utils.Import = Import;
 utils.ImportNow = ImportNow;
 utils.Export = Export;
-utils.ExportToRuntime = ExportToRuntime;
 utils.ImportFromExperimental = ImportFromExperimental;
 utils.GetPrivateSymbol = GetPrivateSymbol;
 utils.SetFunctionName = SetFunctionName;
 utils.InstallConstants = InstallConstants;
 utils.InstallFunctions = InstallFunctions;
 utils.InstallGetter = InstallGetter;
 utils.InstallGetterSetter = InstallGetterSetter;
 utils.SetUpLockedPrototype = SetUpLockedPrototype;
 utils.PostNatives = PostNatives;
 utils.PostExperimentals = PostExperimentals;
 utils.PostDebug = PostDebug;
 
 %ToFastProperties(utils);
 
 })