Hide native Date implementation in function context.

src/math.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.
 
-"use strict";
-
 // This file relies on the fact that the following declarations have been made
 // in runtime.js:
 // var $Object = global.Object;
 
 // Instance class name can only be set on functions. That is the only
 // purpose for MathConstructor.
-function MathConstructor() {}
-var $Math = new MathConstructor();
 
 var rngstate;  // Initialized to a Uint32Array during genesis.
 
 var $abs;
 var $exp;
 var $floor;
 var $max;
 var $min;
 
 // -------------------------------------------------------------------
 
 (function() {
 
+"use strict";
+
 // ECMA 262 - 15.8.2.1
 function MathAbs(x) {
   if (%_IsSmi(x)) return x >= 0 ? x : -x;
   x = TO_NUMBER_INLINE(x);
   if (x === 0) return 0;  // To handle -0.
   return x > 0 ? x : -x;
 }
 
 // ECMA 262 - 15.8.2.2
 function MathAcosJS(x) {
@@ skipping 252 matching lines @@
   approx = NEWTON_ITERATION_CBRT(x, approx);
   approx = NEWTON_ITERATION_CBRT(x, approx);
   approx = NEWTON_ITERATION_CBRT(x, approx);
   return NEWTON_ITERATION_CBRT(x, approx);
 }
 
 // -------------------------------------------------------------------
 
 %CheckIsBootstrapping();
 
-%InternalSetPrototype($Math, $Object.prototype);
-%AddNamedProperty(global, "Math", $Math, DONT_ENUM);
+function MathConstructor() {}
+
+var Math = new MathConstructor();
+
+%InternalSetPrototype(Math, $Object.prototype);
+%AddNamedProperty(global, "Math", Math, DONT_ENUM);
 %FunctionSetInstanceClassName(MathConstructor, 'Math');
 
-%AddNamedProperty($Math, symbolToStringTag, "Math", READ_ONLY | DONT_ENUM);
+%AddNamedProperty(Math, symbolToStringTag, "Math", READ_ONLY | DONT_ENUM);
 
 // Set up math constants.
-InstallConstants($Math, $Array(
+InstallConstants(Math, $Array(
   // ECMA-262, section 15.8.1.1.
   "E", 2.7182818284590452354,
   // ECMA-262, section 15.8.1.2.
   "LN10", 2.302585092994046,
   // ECMA-262, section 15.8.1.3.
   "LN2", 0.6931471805599453,
   // ECMA-262, section 15.8.1.4.
   "LOG2E", 1.4426950408889634,
   "LOG10E", 0.4342944819032518,
   "PI", 3.1415926535897932,
   "SQRT1_2", 0.7071067811865476,
   "SQRT2", 1.4142135623730951
 ));
 
 // Set up non-enumerable functions of the Math object and
 // set their names.
-InstallFunctions($Math, DONT_ENUM, $Array(
+InstallFunctions(Math, DONT_ENUM, $Array(
   "random", MathRandom,
   "abs", MathAbs,
   "acos", MathAcosJS,
   "asin", MathAsinJS,
   "atan", MathAtanJS,
   "ceil", MathCeil,
   "exp", MathExp,
   "floor", MathFloor,
   "log", MathLog,
   "round", MathRound,
@@ skipping 12 matching lines @@
   "hypot", MathHypot,
   "fround", MathFroundJS,
   "clz32", MathClz32,
   "cbrt", MathCbrt
 ));
 
 %SetInlineBuiltinFlag(MathCeil);
 %SetInlineBuiltinFlag(MathFloor);
 %SetInlineBuiltinFlag(MathRandom);
 
-// Keep reference to original values of some global properties.  This
-// has the added benefit that the code in this file is isolated from
-// changes to these properties.
+// Expose to the global scope.
 $abs = MathAbs;
 $exp = MathExp;
 $floor = MathFloor;
 $max = MathMax;
 $min = MathMin;
 
 })();