- Added fast case for extending the JSObject properties storage....

src/date-delay.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 18 matching lines @@
 // -------------------------------------------------------------------
 
 // This file contains date support implemented in JavaScript.
 
 
 // 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.
 const $Date = global.Date;
 
-
 // ECMA 262 - 15.9.1.2
 function Day(time) {
   return $floor(time/msPerDay);
 }
 
 
 // ECMA 262 - 5.2
 function Modulo(value, remainder) {
   var mod = value % remainder;
   return mod >= 0 ? mod : mod + remainder;
@@ skipping 70 matching lines @@
   // We solve this by mapping the time to a year with same leap-year-ness
   // and same starting day for the year.
   // As an optimization we avoid finding an equivalent year in the common
   // case.  We are measuring in ms here so the 32 bit signed integer range
   // is +-(1<<30)*1000 ie approximately +-2.1e20.
   if (t >= -2.1e12 && t <= 2.1e12) return t;
   var day = MakeDay(EquivalentYear(YearFromTime(t)), MonthFromTime(t), DateFromTime(t));
   return TimeClip(MakeDate(day, TimeWithinDay(t)));
 }
 
-
-var local_time_offset;
-
-function LocalTimeOffset() {
-  if (IS_UNDEFINED(local_time_offset)) {
-    local_time_offset = %DateLocalTimeOffset();
-  }
-  return local_time_offset;
-}
-
-
 var daylight_cache_time = $NaN;
 var daylight_cache_offset;
 
 function DaylightSavingsOffset(t) {
   if (t == daylight_cache_time) {
     return daylight_cache_offset;
   }
   var offset = %DateDaylightSavingsOffset(EquivalentTime(t));
   daylight_cache_time = t;
   daylight_cache_offset = offset;
@@ skipping 12 matching lines @@
   timezone_cache_time = t;
   timezone_cache_timezone = timezone;
   return timezone;
 }
 
 
 function WeekDay(time) {
   return Modulo(Day(time) + 4, 7);
 }
 
+var local_time_offset = %DateLocalTimeOffset();
 
 function LocalTime(time) {
   if ($isNaN(time)) return time;
-  return time + LocalTimeOffset() + DaylightSavingsOffset(time);
+  return time + local_time_offset + DaylightSavingsOffset(time);
 }
 
 
 function UTC(time) {
   if ($isNaN(time)) return time;
-  var tmp = time - LocalTimeOffset();
+  var tmp = time - local_time_offset;
   return tmp - DaylightSavingsOffset(tmp);
 }
 
 
 // ECMA 262 - 15.9.1.10
 function HourFromTime(time) {
   return Modulo($floor(time / msPerHour), HoursPerDay);
 }
 
 
@@ skipping 330 matching lines @@
 
 
 function TimeString(time) {
   return TwoDigitString(HourFromTime(time)) + ':'
       + TwoDigitString(MinFromTime(time)) + ':'
       + TwoDigitString(SecFromTime(time));
 }
 
 
 function LocalTimezoneString(time) {
-  var timezoneOffset = (LocalTimeOffset() + DaylightSavingsOffset(time)) / msPerMinute;
+  var timezoneOffset = (local_time_offset + DaylightSavingsOffset(time)) / msPerMinute;
   var sign = (timezoneOffset >= 0) ? 1 : -1;
   var hours = $floor((sign * timezoneOffset)/60);
   var min   = $floor((sign * timezoneOffset)%60);
   var gmt = ' GMT' + ((sign == 1) ? '+' : '-') + TwoDigitString(hours) + TwoDigitString(min);
   return gmt + ' (' +  LocalTimezone(time) + ')';
 }
 
 
 function DatePrintString(time) {
   return DateString(time) + ' ' + TimeString(time);
@@ skipping 472 matching lines @@
     "setFullYear", DateSetFullYear,
     "setUTCFullYear", DateSetUTCFullYear,
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear
   ));
 }
 
 SetupDate();