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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 
DateCacheMock(int local_offset,Rule * rules,int rules_count)42   DateCacheMock(int local_offset, Rule* rules, int rules_count)
43       : local_offset_(local_offset), rules_(rules), rules_count_(rules_count) {}
44 
45  protected:
GetDaylightSavingsOffsetFromOS(int64_t time_sec)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 
GetLocalOffsetFromOS()56   virtual int GetLocalOffsetFromOS() {
57     return local_offset_;
58   }
59 
60  private:
FindRuleFor(int year,int month,int day,int time_in_day_sec)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 
Match(Rule * rule,int year,int month,int day,int time_in_day_sec)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 
ComputeRuleDay(int year,int month,int day)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 
TimeFromYearMonthDay(DateCache * date_cache,int year,int month,int day)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 
CheckDST(int64_t time)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 
TEST(DaylightSavingsTime)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