CSE2410 Fall 2014 Bounce

// 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.

#include "v8.h"

#include "global-handles.h"

#include "snapshot.h"

#include "cctest.h"

using namespace v8::internal;

class DateCacheMock: public DateCache {

 public:

  struct Rule {

    int year, start_month, start_day, end_month, end_day, offset_sec;

  };

  DateCacheMock(int local_offset, Rule* rules, int rules_count)

      : local_offset_(local_offset), rules_(rules), rules_count_(rules_count) {}

 protected:

  virtual int GetDaylightSavingsOffsetFromOS(int64_t time_sec) {

    int days = DaysFromTime(time_sec * 1000);

    int time_in_day_sec = TimeInDay(time_sec * 1000, days) / 1000;

    int year, month, day;

    YearMonthDayFromDays(days, &year, &month, &day);

    Rule* rule = FindRuleFor(year, month, day, time_in_day_sec);

    return rule == NULL ? 0 : rule->offset_sec * 1000;

  }

  virtual int GetLocalOffsetFromOS() {

    return local_offset_;

  }

 private:

  Rule* FindRuleFor(int year, int month, int day, int time_in_day_sec) {

    Rule* result = NULL;

    for (int i = 0; i < rules_count_; i++)

      if (Match(&rules_[i], year, month, day, time_in_day_sec)) {

        result = &rules_[i];

      }

    return result;

  }

  bool Match(Rule* rule, int year, int month, int day, int time_in_day_sec) {

    if (rule->year != 0 && rule->year != year) return false;

    if (rule->start_month > month) return false;

    if (rule->end_month < month) return false;

    int start_day = ComputeRuleDay(year, rule->start_month, rule->start_day);

    if (rule->start_month == month && start_day > day) return false;

    if (rule->start_month == month && start_day == day &&

        2 * 3600 > time_in_day_sec)

      return false;

    int end_day = ComputeRuleDay(year, rule->end_month, rule->end_day);

    if (rule->end_month == month && end_day < day) return false;

    if (rule->end_month == month && end_day == day &&

        2 * 3600 <= time_in_day_sec)

      return false;

    return true;

  }

  int ComputeRuleDay(int year, int month, int day) {

    if (day != 0) return day;

    int days = DaysFromYearMonth(year, month);

    // Find the first Sunday of the month.

    while (Weekday(days + day) != 6) day++;

    return day + 1;

  }

  int local_offset_;

  Rule* rules_;

  int rules_count_;

};

static int64_t TimeFromYearMonthDay(DateCache* date_cache,

                                    int year,

                                    int month,

                                    int day) {

  int64_t result = date_cache->DaysFromYearMonth(year, month);

  return (result + day - 1) * DateCache::kMsPerDay;

}

static void CheckDST(int64_t time) {

  Isolate* isolate = CcTest::i_isolate();

  DateCache* date_cache = isolate->date_cache();

  int64_t actual = date_cache->ToLocal(time);

  int64_t expected = time + date_cache->GetLocalOffsetFromOS() +

                     date_cache->GetDaylightSavingsOffsetFromOS(time / 1000);

  CHECK_EQ(actual, expected);

}

TEST(DaylightSavingsTime) {

  LocalContext context;

  v8::Isolate* isolate = context->GetIsolate();

  v8::HandleScope scope(isolate);

  DateCacheMock::Rule rules[] = {

    {0, 2, 0, 10, 0, 3600},  // DST from March to November in any year.

    {2010, 2, 0, 7, 20, 3600},  // DST from March to August 20 in 2010.

    {2010, 7, 20, 8, 10, 0},  // No DST from August 20 to September 10 in 2010.

    {2010, 8, 10, 10, 0, 3600},  // DST from September 10 to November in 2010.

  };

  int local_offset_ms = -36000000;  // -10 hours.

  DateCacheMock* date_cache =

    new DateCacheMock(local_offset_ms, rules, ARRAY_SIZE(rules));

  reinterpret_cast<Isolate*>(isolate)->set_date_cache(date_cache);

  int64_t start_of_2010 = TimeFromYearMonthDay(date_cache, 2010, 0, 1);

  int64_t start_of_2011 = TimeFromYearMonthDay(date_cache, 2011, 0, 1);

  int64_t august_20 = TimeFromYearMonthDay(date_cache, 2010, 7, 20);

  int64_t september_10 = TimeFromYearMonthDay(date_cache, 2010, 8, 10);

  CheckDST((august_20 + september_10) / 2);

  CheckDST(september_10);

  CheckDST(september_10 + 2 * 3600);

  CheckDST(september_10 + 2 * 3600 - 1000);

  CheckDST(august_20 + 2 * 3600);

  CheckDST(august_20 + 2 * 3600 - 1000);

  CheckDST(august_20);

  // Check each day of 2010.

  for (int64_t time = start_of_2011 + 2 * 3600;

       time >= start_of_2010;

       time -= DateCache::kMsPerDay) {

    CheckDST(time);

    CheckDST(time - 1000);

    CheckDST(time + 1000);

  }

  // Check one day from 2010 to 2100.

  for (int year = 2100; year >= 2010; year--) {

    CheckDST(TimeFromYearMonthDay(date_cache, year, 5, 5));

  }

  CheckDST((august_20 + september_10) / 2);

  CheckDST(september_10);

  CheckDST(september_10 + 2 * 3600);

  CheckDST(september_10 + 2 * 3600 - 1000);

  CheckDST(august_20 + 2 * 3600);

  CheckDST(august_20 + 2 * 3600 - 1000);

  CheckDST(august_20);

}