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      1 // Copyright 2012 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "v8.h"
     29 
     30 #include "global-handles.h"
     31 #include "snapshot.h"
     32 #include "cctest.h"
     33 
     34 using namespace v8::internal;
     35 
     36 class DateCacheMock: public DateCache {
     37  public:
     38   struct Rule {
     39     int year, start_month, start_day, end_month, end_day, offset_sec;
     40   };
     41 
     42   DateCacheMock(int local_offset, Rule* rules, int rules_count)
     43       : local_offset_(local_offset), rules_(rules), rules_count_(rules_count) {}
     44 
     45  protected:
     46   virtual int GetDaylightSavingsOffsetFromOS(int64_t time_sec) {
     47     int days = DaysFromTime(time_sec * 1000);
     48     int time_in_day_sec = TimeInDay(time_sec * 1000, days) / 1000;
     49     int year, month, day;
     50     YearMonthDayFromDays(days, &year, &month, &day);
     51     Rule* rule = FindRuleFor(year, month, day, time_in_day_sec);
     52     return rule == NULL ? 0 : rule->offset_sec * 1000;
     53   }
     54 
     55 
     56   virtual int GetLocalOffsetFromOS() {
     57     return local_offset_;
     58   }
     59 
     60  private:
     61   Rule* FindRuleFor(int year, int month, int day, int time_in_day_sec) {
     62     Rule* result = NULL;
     63     for (int i = 0; i < rules_count_; i++)
     64       if (Match(&rules_[i], year, month, day, time_in_day_sec)) {
     65         result = &rules_[i];
     66       }
     67     return result;
     68   }
     69 
     70 
     71   bool Match(Rule* rule, int year, int month, int day, int time_in_day_sec) {
     72     if (rule->year != 0 && rule->year != year) return false;
     73     if (rule->start_month > month) return false;
     74     if (rule->end_month < month) return false;
     75     int start_day = ComputeRuleDay(year, rule->start_month, rule->start_day);
     76     if (rule->start_month == month && start_day > day) return false;
     77     if (rule->start_month == month && start_day == day &&
     78         2 * 3600 > time_in_day_sec)
     79       return false;
     80     int end_day = ComputeRuleDay(year, rule->end_month, rule->end_day);
     81     if (rule->end_month == month && end_day < day) return false;
     82     if (rule->end_month == month && end_day == day &&
     83         2 * 3600 <= time_in_day_sec)
     84       return false;
     85     return true;
     86   }
     87 
     88 
     89   int ComputeRuleDay(int year, int month, int day) {
     90     if (day != 0) return day;
     91     int days = DaysFromYearMonth(year, month);
     92     // Find the first Sunday of the month.
     93     while (Weekday(days + day) != 6) day++;
     94     return day + 1;
     95   }
     96 
     97   int local_offset_;
     98   Rule* rules_;
     99   int rules_count_;
    100 };
    101 
    102 static int64_t TimeFromYearMonthDay(DateCache* date_cache,
    103                                     int year,
    104                                     int month,
    105                                     int day) {
    106   int64_t result = date_cache->DaysFromYearMonth(year, month);
    107   return (result + day - 1) * DateCache::kMsPerDay;
    108 }
    109 
    110 static void CheckDST(int64_t time) {
    111   Isolate* isolate = Isolate::Current();
    112   DateCache* date_cache = isolate->date_cache();
    113   int64_t actual = date_cache->ToLocal(time);
    114   int64_t expected = time + date_cache->GetLocalOffsetFromOS() +
    115                      date_cache->GetDaylightSavingsOffsetFromOS(time / 1000);
    116   CHECK_EQ(actual, expected);
    117 }
    118 
    119 
    120 TEST(DaylightSavingsTime) {
    121   LocalContext context;
    122   v8::HandleScope scope;
    123   Isolate* isolate = Isolate::Current();
    124   DateCacheMock::Rule rules[] = {
    125     {0, 2, 0, 10, 0, 3600},  // DST from March to November in any year.
    126     {2010, 2, 0, 7, 20, 3600},  // DST from March to August 20 in 2010.
    127     {2010, 7, 20, 8, 10, 0},  // No DST from August 20 to September 10 in 2010.
    128     {2010, 8, 10, 10, 0, 3600},  // DST from September 10 to November in 2010.
    129   };
    130 
    131   int local_offset_ms = -36000000;  // -10 hours.
    132 
    133   DateCacheMock* date_cache =
    134     new DateCacheMock(local_offset_ms, rules, ARRAY_SIZE(rules));
    135 
    136   isolate->set_date_cache(date_cache);
    137 
    138   int64_t start_of_2010 = TimeFromYearMonthDay(date_cache, 2010, 0, 1);
    139   int64_t start_of_2011 = TimeFromYearMonthDay(date_cache, 2011, 0, 1);
    140   int64_t august_20 = TimeFromYearMonthDay(date_cache, 2010, 7, 20);
    141   int64_t september_10 = TimeFromYearMonthDay(date_cache, 2010, 8, 10);
    142   CheckDST((august_20 + september_10) / 2);
    143   CheckDST(september_10);
    144   CheckDST(september_10 + 2 * 3600);
    145   CheckDST(september_10 + 2 * 3600 - 1000);
    146   CheckDST(august_20 + 2 * 3600);
    147   CheckDST(august_20 + 2 * 3600 - 1000);
    148   CheckDST(august_20);
    149   // Check each day of 2010.
    150   for (int64_t time = start_of_2011 + 2 * 3600;
    151        time >= start_of_2010;
    152        time -= DateCache::kMsPerDay) {
    153     CheckDST(time);
    154     CheckDST(time - 1000);
    155     CheckDST(time + 1000);
    156   }
    157   // Check one day from 2010 to 2100.
    158   for (int year = 2100; year >= 2010; year--) {
    159     CheckDST(TimeFromYearMonthDay(date_cache, year, 5, 5));
    160   }
    161   CheckDST((august_20 + september_10) / 2);
    162   CheckDST(september_10);
    163   CheckDST(september_10 + 2 * 3600);
    164   CheckDST(september_10 + 2 * 3600 - 1000);
    165   CheckDST(august_20 + 2 * 3600);
    166   CheckDST(august_20 + 2 * 3600 - 1000);
    167   CheckDST(august_20);
    168 }
    169