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-// Copyright 2012 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
-// with the distribution.
-// * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-#ifndef V8_DATE_H_
-#define V8_DATE_H_
-
-#include "allocation.h"
-#include "globals.h"
-#include "platform.h"
-
-
-namespace v8 {
-namespace internal {
-
-class DateCache {
- public:
- static const int kMsPerMin = 60 * 1000;
- static const int kSecPerDay = 24 * 60 * 60;
- static const int64_t kMsPerDay = kSecPerDay * 1000;
-
- // The largest time that can be passed to OS date-time library functions.
- static const int kMaxEpochTimeInSec = kMaxInt;
- static const int64_t kMaxEpochTimeInMs =
- static_cast<int64_t>(kMaxInt) * 1000;
-
- // The largest time that can be stored in JSDate.
- static const int64_t kMaxTimeInMs =
- static_cast<int64_t>(864000000) * 10000000;
-
- // Conservative upper bound on time that can be stored in JSDate
- // before UTC conversion.
- static const int64_t kMaxTimeBeforeUTCInMs =
- kMaxTimeInMs + 10 * kMsPerDay;
-
- // Sentinel that denotes an invalid local offset.
- static const int kInvalidLocalOffsetInMs = kMaxInt;
- // Sentinel that denotes an invalid cache stamp.
- // It is an invariant of DateCache that cache stamp is non-negative.
- static const int kInvalidStamp = -1;
-
- DateCache() : stamp_(0) {
- ResetDateCache();
- }
-
- virtual ~DateCache() {}
-
-
- // Clears cached timezone information and increments the cache stamp.
- void ResetDateCache();
-
-
- // Computes floor(time_ms / kMsPerDay).
- static int DaysFromTime(int64_t time_ms) {
- if (time_ms < 0) time_ms -= (kMsPerDay - 1);
- return static_cast<int>(time_ms / kMsPerDay);
- }
-
-
- // Computes modulo(time_ms, kMsPerDay) given that
- // days = floor(time_ms / kMsPerDay).
- static int TimeInDay(int64_t time_ms, int days) {
- return static_cast<int>(time_ms - days * kMsPerDay);
- }
-
-
- // Given the number of days since the epoch, computes the weekday.
- // ECMA 262 - 15.9.1.6.
- int Weekday(int days) {
- int result = (days + 4) % 7;
- return result >= 0 ? result : result + 7;
- }
-
-
- bool IsLeap(int year) {
- return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
- }
-
-
- // ECMA 262 - 15.9.1.7.
- int LocalOffsetInMs() {
- if (local_offset_ms_ == kInvalidLocalOffsetInMs) {
- local_offset_ms_ = GetLocalOffsetFromOS();
- }
- return local_offset_ms_;
- }
-
-
- const char* LocalTimezone(int64_t time_ms) {
- if (time_ms < 0 || time_ms > kMaxEpochTimeInMs) {
- time_ms = EquivalentTime(time_ms);
- }
- return OS::LocalTimezone(static_cast<double>(time_ms));
- }
-
- // ECMA 262 - 15.9.5.26
- int TimezoneOffset(int64_t time_ms) {
- int64_t local_ms = ToLocal(time_ms);
- return static_cast<int>((time_ms - local_ms) / kMsPerMin);
- }
-
- // ECMA 262 - 15.9.1.9
- int64_t ToLocal(int64_t time_ms) {
- return time_ms + LocalOffsetInMs() + DaylightSavingsOffsetInMs(time_ms);
- }
-
- // ECMA 262 - 15.9.1.9
- int64_t ToUTC(int64_t time_ms) {
- time_ms -= LocalOffsetInMs();
- return time_ms - DaylightSavingsOffsetInMs(time_ms);
- }
-
-
- // Computes a time equivalent to the given time according
- // to ECMA 262 - 15.9.1.9.
- // The issue here is that some library calls don't work right for dates
- // that cannot be represented using a non-negative signed 32 bit integer
- // (measured in whole seconds based on the 1970 epoch).
- // We solve this by mapping the time to a year with same leap-year-ness
- // and same starting day for the year. The ECMAscript specification says
- // we must do this, but for compatibility with other browsers, we use
- // the actual year if it is in the range 1970..2037
- int64_t EquivalentTime(int64_t time_ms) {
- int days = DaysFromTime(time_ms);
- int time_within_day_ms = static_cast<int>(time_ms - days * kMsPerDay);
- int year, month, day;
- YearMonthDayFromDays(days, &year, &month, &day);
- int new_days = DaysFromYearMonth(EquivalentYear(year), month) + day - 1;
- return static_cast<int64_t>(new_days) * kMsPerDay + time_within_day_ms;
- }
-
- // Returns an equivalent year in the range [2008-2035] matching
- // - leap year,
- // - week day of first day.
- // ECMA 262 - 15.9.1.9.
- int EquivalentYear(int year) {
- int week_day = Weekday(DaysFromYearMonth(year, 0));
- int recent_year = (IsLeap(year) ? 1956 : 1967) + (week_day * 12) % 28;
- // Find the year in the range 2008..2037 that is equivalent mod 28.
- // Add 3*28 to give a positive argument to the modulus operator.
- return 2008 + (recent_year + 3 * 28 - 2008) % 28;
- }
-
- // Given the number of days since the epoch, computes
- // the corresponding year, month, and day.
- void YearMonthDayFromDays(int days, int* year, int* month, int* day);
-
- // Computes the number of days since the epoch for
- // the first day of the given month in the given year.
- int DaysFromYearMonth(int year, int month);
-
- // Cache stamp is used for invalidating caches in JSDate.
- // We increment the stamp each time when the timezone information changes.
- // JSDate objects perform stamp check and invalidate their caches if
- // their saved stamp is not equal to the current stamp.
- Smi* stamp() { return stamp_; }
- void* stamp_address() { return &stamp_; }
-
- // These functions are virtual so that we can override them when testing.
- virtual int GetDaylightSavingsOffsetFromOS(int64_t time_sec) {
- double time_ms = static_cast<double>(time_sec * 1000);
- return static_cast<int>(OS::DaylightSavingsOffset(time_ms));
- }
-
- virtual int GetLocalOffsetFromOS() {
- double offset = OS::LocalTimeOffset();
- ASSERT(offset < kInvalidLocalOffsetInMs);
- return static_cast<int>(offset);
- }
-
- private:
- // The implementation relies on the fact that no time zones have
- // more than one daylight savings offset change per 19 days.
- // In Egypt in 2010 they decided to suspend DST during Ramadan. This
- // led to a short interval where DST is in effect from September 10 to
- // September 30.
- static const int kDefaultDSTDeltaInSec = 19 * kSecPerDay;
-
- // Size of the Daylight Savings Time cache.
- static const int kDSTSize = 32;
-
- // Daylight Savings Time segment stores a segment of time where
- // daylight savings offset does not change.
- struct DST {
- int start_sec;
- int end_sec;
- int offset_ms;
- int last_used;
- };
-
- // Computes the daylight savings offset for the given time.
- // ECMA 262 - 15.9.1.8
- int DaylightSavingsOffsetInMs(int64_t time_ms);
-
- // Sets the before_ and the after_ segments from the DST cache such that
- // the before_ segment starts earlier than the given time and
- // the after_ segment start later than the given time.
- // Both segments might be invalid.
- // The last_used counters of the before_ and after_ are updated.
- void ProbeDST(int time_sec);
-
- // Finds the least recently used segment from the DST cache that is not
- // equal to the given 'skip' segment.
- DST* LeastRecentlyUsedDST(DST* skip);
-
- // Extends the after_ segment with the given point or resets it
- // if it starts later than the given time + kDefaultDSTDeltaInSec.
- inline void ExtendTheAfterSegment(int time_sec, int offset_ms);
-
- // Makes the given segment invalid.
- inline void ClearSegment(DST* segment);
-
- bool InvalidSegment(DST* segment) {
- return segment->start_sec > segment->end_sec;
- }
-
- Smi* stamp_;
-
- // Daylight Saving Time cache.
- DST dst_[kDSTSize];
- int dst_usage_counter_;
- DST* before_;
- DST* after_;
-
- int local_offset_ms_;
-
- // Year/Month/Day cache.
- bool ymd_valid_;
- int ymd_days_;
- int ymd_year_;
- int ymd_month_;
- int ymd_day_;
-};
-
-} } // namespace v8::internal
-
-#endif
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