New class for Date objects: caches individual date components.

src/date.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 434 matching lines @@
     minutes = argc > 4 ? ToNumber(minutes) : 0;
     seconds = argc > 5 ? ToNumber(seconds) : 0;
     ms = argc > 6 ? ToNumber(ms) : 0;
     year = (!NUMBER_IS_NAN(year) &&
             0 <= TO_INTEGER(year) &&
             TO_INTEGER(year) <= 99) ? 1900 + TO_INTEGER(year) : year;
     var day = MakeDay(year, month, date);
     var time = MakeTime(hours, minutes, seconds, ms);
     value = TimeClip(UTC(MakeDate(day, time)));
   }
-  %_SetValueOf(this, value);
+  SET_DATE_VALUE(this, value);
 });
 
 
 %FunctionSetPrototype($Date, new $Date($NaN));
 
 
 var WeekDays = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
 var Months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun',
               'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
 
@@ skipping 92 matching lines @@
   date = argc > 2 ? ToNumber(date) : 1;
   hours = argc > 3 ? ToNumber(hours) : 0;
   minutes = argc > 4 ? ToNumber(minutes) : 0;
   seconds = argc > 5 ? ToNumber(seconds) : 0;
   ms = argc > 6 ? ToNumber(ms) : 0;
   year = (!NUMBER_IS_NAN(year) &&
           0 <= TO_INTEGER(year) &&
           TO_INTEGER(year) <= 99) ? 1900 + TO_INTEGER(year) : year;
   var day = MakeDay(year, month, date);
   var time = MakeTime(hours, minutes, seconds, ms);
-  return %_SetValueOf(this, TimeClip(MakeDate(day, time)));
+  return TimeClip(MakeDate(day, time));
 }
 
 
 // Mozilla-specific extension. Returns the number of milliseconds
 // elapsed since 1 January 1970 00:00:00 UTC.
 function DateNow() {
   return %DateCurrentTime();
 }
 
 
@@ skipping 188 matching lines @@
 function DateGetTimezoneOffset() {
   var t = DATE_VALUE(this);
   if (NUMBER_IS_NAN(t)) return t;
   return (t - LocalTimeNoCheck(t)) / msPerMinute;
 }
 
 
 // ECMA 262 - 15.9.5.27
 function DateSetTime(ms) {
   if (!IS_DATE(this)) ThrowDateTypeError();
-  return %_SetValueOf(this, TimeClip(ToNumber(ms)));
+  return SET_DATE_VALUE(this, TimeClip(ToNumber(ms)));
 }
 
 
 // ECMA 262 - 15.9.5.28
 function DateSetMilliseconds(ms) {
   var t = LocalTime(DATE_VALUE(this));
   ms = ToNumber(ms);
   var time = MakeTime(HOUR_FROM_TIME(t),
                       MIN_FROM_TIME(t),
                       SEC_FROM_TIME(t),
                       ms);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(DAY(t), time))));
 }
 
 
 // ECMA 262 - 15.9.5.29
 function DateSetUTCMilliseconds(ms) {
   var t = DATE_VALUE(this);
   ms = ToNumber(ms);
   var time = MakeTime(HOUR_FROM_TIME(t),
                       MIN_FROM_TIME(t),
                       SEC_FROM_TIME(t),
                       ms);
-  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(DAY(t), time)));
 }
 
 
 // ECMA 262 - 15.9.5.30
 function DateSetSeconds(sec, ms) {
   var t = LocalTime(DATE_VALUE(this));
   sec = ToNumber(sec);
   ms = %_ArgumentsLength() < 2 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
   var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), sec, ms);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(DAY(t), time))));
 }
 
 
 // ECMA 262 - 15.9.5.31
 function DateSetUTCSeconds(sec, ms) {
   var t = DATE_VALUE(this);
   sec = ToNumber(sec);
   ms = %_ArgumentsLength() < 2 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
   var time = MakeTime(HOUR_FROM_TIME(t), MIN_FROM_TIME(t), sec, ms);
-  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(DAY(t), time)));
 }
 
 
 // ECMA 262 - 15.9.5.33
 function DateSetMinutes(min, sec, ms) {
   var t = LocalTime(DATE_VALUE(this));
   min = ToNumber(min);
   var argc = %_ArgumentsLength();
   sec = argc < 2 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
   ms = argc < 3 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
   var time = MakeTime(HOUR_FROM_TIME(t), min, sec, ms);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(DAY(t), time))));
 }
 
 
 // ECMA 262 - 15.9.5.34
 function DateSetUTCMinutes(min, sec, ms) {
   var t = DATE_VALUE(this);
   min = ToNumber(min);
   var argc = %_ArgumentsLength();
   sec = argc < 2 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
   ms = argc < 3 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
   var time = MakeTime(HOUR_FROM_TIME(t), min, sec, ms);
-  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(DAY(t), time)));
 }
 
 
 // ECMA 262 - 15.9.5.35
 function DateSetHours(hour, min, sec, ms) {
   var t = LocalTime(DATE_VALUE(this));
   hour = ToNumber(hour);
   var argc = %_ArgumentsLength();
   min = argc < 2 ? NAN_OR_MIN_FROM_TIME(t) : ToNumber(min);
   sec = argc < 3 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
   ms = argc < 4 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
   var time = MakeTime(hour, min, sec, ms);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(DAY(t), time))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(DAY(t), time))));
 }
 
 
 // ECMA 262 - 15.9.5.34
 function DateSetUTCHours(hour, min, sec, ms) {
   var t = DATE_VALUE(this);
   hour = ToNumber(hour);
   var argc = %_ArgumentsLength();
   min = argc < 2 ? NAN_OR_MIN_FROM_TIME(t) : ToNumber(min);
   sec = argc < 3 ? NAN_OR_SEC_FROM_TIME(t) : ToNumber(sec);
   ms = argc < 4 ? NAN_OR_MS_FROM_TIME(t) : ToNumber(ms);
   var time = MakeTime(hour, min, sec, ms);
-  return %_SetValueOf(this, TimeClip(MakeDate(DAY(t), time)));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(DAY(t), time)));
 }
 
 
 // ECMA 262 - 15.9.5.36
 function DateSetDate(date) {
   var t = LocalTime(DATE_VALUE(this));
   date = ToNumber(date);
   var day = MakeDay(YearFromTime(t), MonthFromTime(t), date);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
 }
 
 
 // ECMA 262 - 15.9.5.37
 function DateSetUTCDate(date) {
   var t = DATE_VALUE(this);
   date = ToNumber(date);
   var day = MakeDay(YearFromTime(t), MonthFromTime(t), date);
-  return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
 }
 
 
 // ECMA 262 - 15.9.5.38
 function DateSetMonth(month, date) {
   var t = LocalTime(DATE_VALUE(this));
   month = ToNumber(month);
   date = %_ArgumentsLength() < 2 ? NAN_OR_DATE_FROM_TIME(t) : ToNumber(date);
   var day = MakeDay(YearFromTime(t), month, date);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
 }
 
 
 // ECMA 262 - 15.9.5.39
 function DateSetUTCMonth(month, date) {
   var t = DATE_VALUE(this);
   month = ToNumber(month);
   date = %_ArgumentsLength() < 2 ? NAN_OR_DATE_FROM_TIME(t) : ToNumber(date);
   var day = MakeDay(YearFromTime(t), month, date);
-  return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
 }
 
 
 // ECMA 262 - 15.9.5.40
 function DateSetFullYear(year, month, date) {
   var t = DATE_VALUE(this);
   t = NUMBER_IS_NAN(t) ? 0 : LocalTimeNoCheck(t);
   year = ToNumber(year);
   var argc = %_ArgumentsLength();
   month = argc < 2 ? MonthFromTime(t) : ToNumber(month);
   date = argc < 3 ? DateFromTime(t) : ToNumber(date);
   var day = MakeDay(year, month, date);
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
 }
 
 
 // ECMA 262 - 15.9.5.41
 function DateSetUTCFullYear(year, month, date) {
   var t = DATE_VALUE(this);
   if (NUMBER_IS_NAN(t)) t = 0;
   var argc = %_ArgumentsLength();
   year = ToNumber(year);
   month = argc < 2 ? MonthFromTime(t) : ToNumber(month);
   date = argc < 3 ? DateFromTime(t) : ToNumber(date);
   var day = MakeDay(year, month, date);
-  return %_SetValueOf(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
+  return SET_DATE_VALUE(this, TimeClip(MakeDate(day, TimeWithinDay(t))));
 }
 
 
 // ECMA 262 - 15.9.5.42
 function DateToUTCString() {
   var t = DATE_VALUE(this);
   if (NUMBER_IS_NAN(t)) return kInvalidDate;
   // Return UTC string of the form: Sat, 31 Jan 1970 23:00:00 GMT
   return WeekDays[WeekDay(t)] + ', '
       + TwoDigitString(DateFromTime(t)) + ' '
       + Months[MonthFromTime(t)] + ' '
       + YearFromTime(t) + ' '
       + TimeString(t) + ' GMT';
 }
 
 
 // ECMA 262 - B.2.4
 function DateGetYear() {
   var t = DATE_VALUE(this);
   if (NUMBER_IS_NAN(t)) return $NaN;
   return YearFromTime(LocalTimeNoCheck(t)) - 1900;
 }
 
 
 // ECMA 262 - B.2.5
 function DateSetYear(year) {
   var t = LocalTime(DATE_VALUE(this));
   if (NUMBER_IS_NAN(t)) t = 0;
   year = ToNumber(year);
-  if (NUMBER_IS_NAN(year)) return %_SetValueOf(this, $NaN);
+  if (NUMBER_IS_NAN(year)) return SET_DATE_VALUE(this, $NaN);
   year = (0 <= TO_INTEGER(year) && TO_INTEGER(year) <= 99)
       ? 1900 + TO_INTEGER(year) : year;
   var day = MakeDay(year, MonthFromTime(t), DateFromTime(t));
-  return %_SetValueOf(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
+  return SET_DATE_VALUE(this, TimeClip(UTC(MakeDate(day, TimeWithinDay(t)))));
 }
 
 
 // ECMA 262 - B.2.6
 //
 // Notice that this does not follow ECMA 262 completely.  ECMA 262
 // says that toGMTString should be the same Function object as
 // toUTCString.  JSC does not do this, so for compatibility we do not
 // do that either.  Instead, we create a new function whose name
 // property will return toGMTString.
@@ skipping 137 matching lines @@
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear,
     "toISOString", DateToISOString,
     "toJSON", DateToJSON
   ));
 }
 
 SetUpDate();