Hide Math function implementations in a closure.

src/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.
 
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 // var $Boolean = global.Boolean;
 // var $Number = global.Number;
 // var $Function = global.Function;
 // var $Array = global.Array;
-//
-// in math.js:
-// var $floor = MathFloor
 
 var $isNaN = GlobalIsNaN;
 var $isFinite = GlobalIsFinite;
 
 // ----------------------------------------------------------------------------
 
 // Helper function used to install functions on objects.
 function InstallFunctions(object, attributes, functions) {
   if (functions.length >= 8) {
     %OptimizeObjectForAddingMultipleProperties(object, functions.length >> 1);
@@ skipping 1623 matching lines @@
 // Harmony isNaN.
 function NumberIsNaN(number) {
   return IS_NUMBER(number) && NUMBER_IS_NAN(number);
 }
 
 
 // Harmony isSafeInteger
 function NumberIsSafeInteger(number) {
   if (NumberIsFinite(number)) {
     var integral = TO_INTEGER(number);
-    if (integral == number)
-      return MathAbs(integral) <= $Number.MAX_SAFE_INTEGER;
+    if (integral == number) return $abs(integral) <= $Number.MAX_SAFE_INTEGER;
   }
   return false;
 }
 
 
 // ----------------------------------------------------------------------------
 
 function SetUpNumber() {
   %CheckIsBootstrapping();
 
@@ skipping 217 matching lines @@
   }
   if (!IS_SPEC_FUNCTION(method)) {
     throw MakeTypeError('not_iterable', [obj]);
   }
   var iterator = %_CallFunction(obj, method);
   if (!IS_SPEC_OBJECT(iterator)) {
     throw MakeTypeError('not_an_iterator', [iterator]);
   }
   return iterator;
 }