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Commit 5f75b01b authored by oleg@chromium.org's avatar oleg@chromium.org
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Rewrite the function that converts timestamp to year, month and day in C++. 

Review URL: http://codereview.chromium.org/811006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4115 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent 4e5d3476
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Showing with 371 additions and 69 deletions
src/date-delay.js
View file @ 5f75b01b
...@@ -293,55 +293,48 @@ function CalculateDateTable() { ...@@ -293,55 +293,48 @@ function CalculateDateTable() {
} }
// Constructor for creating objects holding year, month, and date. var ymd_from_time_cache = [$NaN, $NaN, $NaN];
// Introduced to ensure the two return points in FromJulianDay match same map. var ymd_from_time_cached_time = $NaN;
function DayTriplet(year, month, date) {
this.year = year; function YearFromTime(t) {
this.month = month; if (t !== ymd_from_time_cached_time) {
this.date = date; // Limits according to ECMA 262 15.9.1.1
} if (!$isFinite(t) || t < -8640000000000000 || t > 8640000000000000) {
return $NaN;
var julian_day_cache_triplet; }
var julian_day_cache_day = $NaN;
%DateYMDFromTime(t, ymd_from_time_cache);
// Compute year, month, and day from modified Julian day. ymd_from_time_cached_time = t
// The missing days in 1582 are ignored for JavaScript compatibility.
function FromJulianDay(julian) {
if (julian_day_cache_day == julian) {
return julian_day_cache_triplet;
} }
var result;
// Avoid floating point and non-Smi maths in common case. This is also a period of return ymd_from_time_cache[0];
// time where leap years are very regular. The range is not too large to avoid overflow }
// when doing the multiply-to-divide trick.
if (julian > kDayZeroInJulianDay && function MonthFromTime(t) {
(julian - kDayZeroInJulianDay) < 40177) { // 1970 - 2080 if (t !== ymd_from_time_cached_time) {
var jsimple = (julian - kDayZeroInJulianDay) + 731; // Day 0 is 1st January 1968 // Limits according to ECMA 262 15.9.1.1
var y = 1968; if (!$isFinite(t) || t < -8640000000000000 || t > 8640000000000000) {
// Divide by 1461 by multiplying with 22967 and shifting down by 25! return $NaN;
var after_1968 = (jsimple * 22967) >> 25; }
y += after_1968 << 2; %DateYMDFromTime(t, ymd_from_time_cache);
jsimple -= 1461 * after_1968; ymd_from_time_cached_time = t
var four_year_cycle = four_year_cycle_table[jsimple];
result = new DayTriplet(y + (four_year_cycle >> kYearShift),
(four_year_cycle & kMonthMask) >> kMonthShift,
four_year_cycle & kDayMask);
} else {
var jalpha = FLOOR((julian - 1867216.25) / 36524.25);
var jb = julian + 1 + jalpha - FLOOR(0.25 * jalpha) + 1524;
var jc = FLOOR(6680.0 + ((jb-2439870) - 122.1)/365.25);
var jd = FLOOR(365 * jc + (0.25 * jc));
var je = FLOOR((jb - jd)/30.6001);
var m = je - 1;
if (m > 12) m -= 13;
var y = jc - 4715;
if (m > 2) { --y; --m; }
var d = jb - jd - FLOOR(30.6001 * je);
result = new DayTriplet(y, m, d);
} }
julian_day_cache_day = julian;
julian_day_cache_triplet = result; return ymd_from_time_cache[1];
return result; }
function DateFromTime(t) {
if (t !== ymd_from_time_cached_time) {
// Limits according to ECMA 262 15.9.1.1
if (!$isFinite(t) || t < -8640000000000000 || t > 8640000000000000) {
return $NaN;
}
%DateYMDFromTime(t, ymd_from_time_cache);
ymd_from_time_cached_time = t
}
return ymd_from_time_cache[2];
} }
...@@ -577,11 +570,10 @@ function TwoDigitString(value) { ...@@ -577,11 +570,10 @@ function TwoDigitString(value) {
function DateString(time) { function DateString(time) {
var YMD = FromJulianDay(DAY(time) + kDayZeroInJulianDay);
return WeekDays[WeekDay(time)] + ' ' return WeekDays[WeekDay(time)] + ' '
+ Months[YMD.month] + ' ' + Months[MonthFromTime(time)] + ' '
+ TwoDigitString(YMD.date) + ' ' + TwoDigitString(DateFromTime(time)) + ' '
+ YMD.year; + YearFromTime(time);
} }
...@@ -590,11 +582,10 @@ var LongMonths = ['January', 'February', 'March', 'April', 'May', 'June', 'July' ...@@ -590,11 +582,10 @@ var LongMonths = ['January', 'February', 'March', 'April', 'May', 'June', 'July'
function LongDateString(time) { function LongDateString(time) {
var YMD = FromJulianDay(DAY(time) + kDayZeroInJulianDay);
return LongWeekDays[WeekDay(time)] + ', ' return LongWeekDays[WeekDay(time)] + ', '
+ LongMonths[YMD.month] + ' ' + LongMonths[MonthFromTime(time)] + ' '
+ TwoDigitString(YMD.date) + ', ' + TwoDigitString(DateFromTime(time)) + ', '
+ YMD.year; + YearFromTime(time);
} }
......
src/macros.py
View file @ 5f75b01b
...@@ -136,9 +136,9 @@ macro NUMBER_OF_CAPTURES(array) = ((array)[0]); ...@@ -136,9 +136,9 @@ macro NUMBER_OF_CAPTURES(array) = ((array)[0]);
# a type error is thrown. # a type error is thrown.
macro DATE_VALUE(arg) = (%_ClassOf(arg) === 'Date' ? %_ValueOf(arg) : ThrowDateTypeError()); macro DATE_VALUE(arg) = (%_ClassOf(arg) === 'Date' ? %_ValueOf(arg) : ThrowDateTypeError());
macro DAY(time) = ($floor(time / 86400000)); macro DAY(time) = ($floor(time / 86400000));
macro MONTH_FROM_TIME(time) = (FromJulianDay(($floor(time / 86400000)) + 2440588).month); macro MONTH_FROM_TIME(time) = (MonthFromTime(time));
macro DATE_FROM_TIME(time) = (FromJulianDay(($floor(time / 86400000)) + 2440588).date); macro DATE_FROM_TIME(time) = (DateFromTime(time));
macro YEAR_FROM_TIME(time) = (FromJulianDay(($floor(time / 86400000)) + 2440588).year); macro YEAR_FROM_TIME(time) = (YearFromTime(time));
macro HOUR_FROM_TIME(time) = (Modulo($floor(time / 3600000), 24)); macro HOUR_FROM_TIME(time) = (Modulo($floor(time / 3600000), 24));
macro MIN_FROM_TIME(time) = (Modulo($floor(time / 60000), 60)); macro MIN_FROM_TIME(time) = (Modulo($floor(time / 60000), 60));
macro SEC_FROM_TIME(time) = (Modulo($floor(time / 1000), 60)); macro SEC_FROM_TIME(time) = (Modulo($floor(time / 1000), 60));
......
src/runtime.cc
View file @ 5f75b01b
...@@ -5128,14 +5128,7 @@ static Object* Runtime_Math_tan(Arguments args) { ...@@ -5128,14 +5128,7 @@ static Object* Runtime_Math_tan(Arguments args) {
} }
static Object* Runtime_DateMakeDay(Arguments args) { static int MakeDay(int year, int month, int day) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_SMI_CHECKED(year, args[0]);
CONVERT_SMI_CHECKED(month, args[1]);
CONVERT_SMI_CHECKED(date, args[2]);
static const int day_from_month[] = {0, 31, 59, 90, 120, 151, static const int day_from_month[] = {0, 31, 59, 90, 120, 151,
181, 212, 243, 273, 304, 334}; 181, 212, 243, 273, 304, 334};
static const int day_from_month_leap[] = {0, 31, 60, 91, 121, 152, static const int day_from_month_leap[] = {0, 31, 60, 91, 121, 152,
...@@ -5157,7 +5150,7 @@ static Object* Runtime_DateMakeDay(Arguments args) { ...@@ -5157,7 +5150,7 @@ static Object* Runtime_DateMakeDay(Arguments args) {
// ECMA 262 - 15.9.1.1, i.e. upto 100,000,000 days on either side of // ECMA 262 - 15.9.1.1, i.e. upto 100,000,000 days on either side of
// Jan 1 1970. This is required so that we don't run into integer // Jan 1 1970. This is required so that we don't run into integer
// division of negative numbers. // division of negative numbers.
// c) there shouldn't be overflow for 32-bit integers in the following // c) there shouldn't be an overflow for 32-bit integers in the following
// operations. // operations.
static const int year_delta = 399999; static const int year_delta = 399999;
static const int base_day = 365 * (1970 + year_delta) + static const int base_day = 365 * (1970 + year_delta) +
...@@ -5173,10 +5166,327 @@ static Object* Runtime_DateMakeDay(Arguments args) { ...@@ -5173,10 +5166,327 @@ static Object* Runtime_DateMakeDay(Arguments args) {
base_day; base_day;
if (year % 4 || (year % 100 == 0 && year % 400 != 0)) { if (year % 4 || (year % 100 == 0 && year % 400 != 0)) {
return Smi::FromInt(day_from_year + day_from_month[month] + date - 1); return day_from_year + day_from_month[month] + day - 1;
} }
return Smi::FromInt(day_from_year + day_from_month_leap[month] + date - 1); return day_from_year + day_from_month_leap[month] + day - 1;
}
static Object* Runtime_DateMakeDay(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 3);
CONVERT_SMI_CHECKED(year, args[0]);
CONVERT_SMI_CHECKED(month, args[1]);
CONVERT_SMI_CHECKED(date, args[2]);
return Smi::FromInt(MakeDay(year, month, date));
}
static const int kDays4Years[] = {0, 365, 2 * 365, 3 * 365 + 1};
static const int kDaysIn4Years = 4 * 365 + 1;
static const int kDaysIn100Years = 25 * kDaysIn4Years - 1;
static const int kDaysIn400Years = 4 * kDaysIn100Years + 1;
static const int kDays1970to2000 = 30 * 365 + 7;
static const int kDaysOffset = 1000 * kDaysIn400Years + 5 * kDaysIn400Years -
kDays1970to2000;
static const int kYearsOffset = 400000;
static const char kDayInYear[] = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30,
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31};
static const char kMonthInYear[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3,
4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
4, 4, 4, 4, 4, 4,
5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 5, 5, 5,
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
6, 6, 6, 6, 6, 6,
7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
7, 7, 7, 7, 7, 7,
8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
8, 8, 8, 8, 8,
9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
9, 9, 9, 9, 9, 9,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11};
// This function works for dates from 1970 to 2099.
static inline void DateYMDFromTimeAfter1970(int date,
int &year, int &month, int &day) {
#ifdef DEBUG
int save_date = date; // Need this for ASSERT in the end.
#endif
year = 1970 + (4 * date + 2) / kDaysIn4Years;
date %= kDaysIn4Years;
month = kMonthInYear[date];
day = kDayInYear[date];
ASSERT(MakeDay(year, month, day) == save_date);
}
static inline void DateYMDFromTimeSlow(int date,
int &year, int &month, int &day) {
#ifdef DEBUG
int save_date = date; // Need this for ASSERT in the end.
#endif
date += kDaysOffset;
year = 400 * (date / kDaysIn400Years) - kYearsOffset;
date %= kDaysIn400Years;
ASSERT(MakeDay(year, 0, 1) + date == save_date);
date--;
int yd1 = date / kDaysIn100Years;
date %= kDaysIn100Years;
year += 100 * yd1;
date++;
int yd2 = date / kDaysIn4Years;
date %= kDaysIn4Years;
year += 4 * yd2;
date--;
int yd3 = date / 365;
date %= 365;
year += yd3;
bool is_leap = (!yd1 || yd2) && !yd3;
ASSERT(date >= -1);
ASSERT(is_leap || date >= 0);
ASSERT(date < 365 || is_leap && date < 366);
ASSERT(is_leap == (year % 4 == 0 && (year % 100 || (year % 400 == 0))));
ASSERT(is_leap || MakeDay(year, 0, 1) + date == save_date);
ASSERT(!is_leap || MakeDay(year, 0, 1) + date + 1 == save_date);
if (is_leap) {
day = kDayInYear[2*365 + 1 + date];
month = kMonthInYear[2*365 + 1 + date];
} else {
day = kDayInYear[date];
month = kMonthInYear[date];
}
ASSERT(MakeDay(year, month, day) == save_date);
}
static inline void DateYMDFromTime(int date,
int &year, int &month, int &day) {
if (date >= 0 && date < 32 * kDaysIn4Years) {
DateYMDFromTimeAfter1970(date, year, month, day);
} else {
DateYMDFromTimeSlow(date, year, month, day);
}
}
static Object* Runtime_DateYMDFromTime(Arguments args) {
NoHandleAllocation ha;
ASSERT(args.length() == 2);
CONVERT_DOUBLE_CHECKED(t, args[0]);
CONVERT_CHECKED(JSArray, res_array, args[1]);
int year, month, day;
DateYMDFromTime(static_cast<int>(floor(t / 86400000)), year, month, day);
res_array->SetElement(0, Smi::FromInt(year));
res_array->SetElement(1, Smi::FromInt(month));
res_array->SetElement(2, Smi::FromInt(day));
return Heap::undefined_value();
} }
......
src/runtime.h
View file @ 5f75b01b
...@@ -204,6 +204,7 @@ namespace internal { ...@@ -204,6 +204,7 @@ namespace internal {
F(DateLocalTimeOffset, 0, 1) \ F(DateLocalTimeOffset, 0, 1) \
F(DateDaylightSavingsOffset, 1, 1) \ F(DateDaylightSavingsOffset, 1, 1) \
F(DateMakeDay, 3, 1) \ F(DateMakeDay, 3, 1) \
F(DateYMDFromTime, 2, 1) \
\ \
/* Numbers */ \ /* Numbers */ \
F(NumberIsFinite, 1, 1) \ F(NumberIsFinite, 1, 1) \
......
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