Refactor Date implementation in VM.

runtime/lib/date.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include <time.h>
 
 #include "vm/bootstrap_natives.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/native_entry.h"
 #include "vm/object.h"
 #include "vm/os.h"
 
 namespace dart {
 
-typedef struct BrokenDownDate {
-  intptr_t year;
-  intptr_t month;  // [1..12]
-  intptr_t day;    // [1..31]
-  intptr_t hours;
-  intptr_t minutes;
-  intptr_t seconds;
-} BrokenDownDate;
-
-
-// Takes the seconds since epoch (midnight, January 1, 1970 UTC) and breaks it
-// down into date and time.
-// If 'dart_is_utc', then the broken down date and time are in the UTC timezone,
-// otherwise the local timezone is used.
-// The returned year is offset by 1900. The returned month is 0-based.
-// Returns true if the conversion succeeds, false otherwise.
-static bool BreakDownSecondsSinceEpoch(const Integer& dart_seconds,
-                                       const Bool& dart_is_utc,
-                                       BrokenDownDate* result) {
-  // Always fill the result to avoid unitialized use warnings.
-  result->year = 0;
-  result->month = 0;
-  result->day = 0;
-  result->hours = 0;
-  result->minutes = 0;
-  result->seconds = 0;
-
-  bool is_utc = dart_is_utc.value();
-  int64_t seconds = dart_seconds.AsInt64Value();
-
-  struct tm tm_result;
-  bool succeeded;
-  if (is_utc) {
-    succeeded = OS::GmTime(seconds, &tm_result);
-  } else {
-    succeeded = OS::LocalTime(seconds, &tm_result);
-  }
-  if (succeeded) {
-    result->year = tm_result.tm_year;
-    // C uses years since 1900, and not full years.
-    // Adding 1900 could overflow the intptr_t.
-    if (result->year > kIntptrMax - 1900) return false;
-    result->year += 1900;
-    // Dart has 1-based months (contrary to C's 0-based).
-    result->month= tm_result.tm_mon + 1;
-    result->day = tm_result.tm_mday;
-    result->hours = tm_result.tm_hour;
-    result->minutes = tm_result.tm_min;
-    result->seconds = tm_result.tm_sec;
-  }
-  return succeeded;
-}
-
-
-static bool BrokenDownToSecondsSinceEpoch(const BrokenDownDate& broken_down,
-                                          bool in_utc,
-                                          int64_t* result) {
-  // Always set the result to avoid unitialized use warnings.
-  *result = 0;
-
-  struct tm tm_broken_down;
-  intptr_t year = broken_down.year;
-  // C works with years since 1900.
-  // Removing 1900 could underflow the intptr_t.
-  if (year < kIntptrMin + 1900) return false;
-  year -= 1900;
-  intptr_t month = broken_down.month;
-  // C works with 0-based months.
-  // Avoid underflows (even though they should not matter since the date would
-  // be invalid anyways.
-  if (month < 0) return false;
-  month--;
-  tm_broken_down.tm_year = static_cast<int>(year);
-  tm_broken_down.tm_mon = static_cast<int>(month);
-  tm_broken_down.tm_mday = static_cast<int>(broken_down.day);
-  tm_broken_down.tm_hour = static_cast<int>(broken_down.hours);
-  tm_broken_down.tm_min = static_cast<int>(broken_down.minutes);
-  tm_broken_down.tm_sec = static_cast<int>(broken_down.seconds);
-  // Verify that casting to int did not change the value.
-  if (tm_broken_down.tm_year != year
-      || tm_broken_down.tm_mon != month
-      || tm_broken_down.tm_mday != broken_down.day
-      || tm_broken_down.tm_hour != broken_down.hours
-      || tm_broken_down.tm_min != broken_down.minutes
-      || tm_broken_down.tm_sec != broken_down.seconds) {
-    return false;
-  }
-  if (in_utc) {
-    return OS::MkGmTime(&tm_broken_down, result);
-  } else {
-    return OS::MkTime(&tm_broken_down, result);
-  }
-}
-
-
-DEFINE_NATIVE_ENTRY(DateNatives_brokenDownToSecondsSinceEpoch, 7) {
-  GET_NATIVE_ARGUMENT(Integer, dart_years, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Smi, dart_month, arguments->At(1));
-  GET_NATIVE_ARGUMENT(Smi, dart_day, arguments->At(2));
-  GET_NATIVE_ARGUMENT(Smi, dart_hours, arguments->At(3));
-  GET_NATIVE_ARGUMENT(Smi, dart_minutes, arguments->At(4));
-  GET_NATIVE_ARGUMENT(Smi, dart_seconds, arguments->At(5));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(6));
-  if (!dart_years.IsSmi()) {
-    UNIMPLEMENTED();
-  }
-  Smi& smi_years = Smi::Handle();
-  smi_years ^= dart_years.raw();
-  BrokenDownDate broken_down;
-  broken_down.year = smi_years.Value();
-  broken_down.month = dart_month.Value();
-  broken_down.day = dart_day.Value();
-  broken_down.hours = dart_hours.Value();
-  broken_down.minutes = dart_minutes.Value();
-  broken_down.seconds = dart_seconds.Value();
-  int64_t value;
-  bool succeeded = BrokenDownToSecondsSinceEpoch(broken_down,
-                                                 dart_is_utc.value(),
-                                                 &value);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  arguments->SetReturn(Integer::Handle(Integer::New(value)));
-}
-
+static int32_t kMaxAllowedSeconds = 2100000000;
 
 DEFINE_NATIVE_ENTRY(DateNatives_timeZoneName, 1) {
   GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
   int64_t seconds = dart_seconds.AsInt64Value();
-  const char* name;
-  bool succeeded = OS::GetTimeZoneName(seconds, &name);
-  if (!succeeded) {
-    UNIMPLEMENTED();
+  if (seconds < 0 || seconds > kMaxAllowedSeconds) {
+    GrowableArray<const Object*> args;
+    args.Add(&dart_seconds);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
   }
+  const char* name = OS::GetTimeZoneName(seconds);
   const String& dart_name = String::Handle(String::New(name));
   arguments->SetReturn(dart_name);
 }
 
 
 DEFINE_NATIVE_ENTRY(DateNatives_timeZoneOffsetInSeconds, 1) {
   GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
   int64_t seconds = dart_seconds.AsInt64Value();
-  int offset;
-  bool succeeded = OS::GetTimeZoneOffsetInSeconds(seconds, &offset);
-  if (!succeeded) {
-    UNIMPLEMENTED();
+  if (seconds < 0 || seconds > kMaxAllowedSeconds) {
+    GrowableArray<const Object*> args;
+    args.Add(&dart_seconds);
+    Exceptions::ThrowByType(Exceptions::kIllegalArgument, args);
   }
+  int offset = OS::GetTimeZoneOffsetInSeconds(seconds);
   const Integer& dart_offset = Integer::Handle(Integer::New(offset));
   arguments->SetReturn(dart_offset);
 }
 
 
+DEFINE_NATIVE_ENTRY(DateNatives_localTimeZoneAdjustmentInSeconds, 0) {
+  int adjustment = OS::GetLocalTimeZoneAdjustmentInSeconds();
+  const Integer& dart_adjustment = Integer::Handle(Integer::New(adjustment));
+  arguments->SetReturn(dart_adjustment);
+}
+
+
 DEFINE_NATIVE_ENTRY(DateNatives_currentTimeMillis, 0) {
   const Integer& time = Integer::Handle(
       Integer::New(OS::GetCurrentTimeMillis()));
   arguments->SetReturn(time);
 }
 
-
-DEFINE_NATIVE_ENTRY(DateNatives_getYear, 2) {
-  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
-  BrokenDownDate broken_down;
-  bool succeeded =
-      BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  intptr_t year = broken_down.year;
-  arguments->SetReturn(Integer::Handle(Integer::New(year)));
-}
-
-
-DEFINE_NATIVE_ENTRY(DateNatives_getMonth, 2) {
-  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
-  BrokenDownDate broken_down;
-  bool succeeded =
-      BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  const Smi& result = Smi::Handle(Smi::New(broken_down.month));
-  arguments->SetReturn(result);
-}
-
-
-DEFINE_NATIVE_ENTRY(DateNatives_getDay, 2) {
-  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
-  BrokenDownDate broken_down;
-  bool succeeded =
-      BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  const Smi& result = Smi::Handle(Smi::New(broken_down.day));
-  arguments->SetReturn(result);
-}
-
-
-DEFINE_NATIVE_ENTRY(DateNatives_getHours, 2) {
-  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
-  BrokenDownDate broken_down;
-  bool succeeded =
-      BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  const Smi& result = Smi::Handle(Smi::New(broken_down.hours));
-  arguments->SetReturn(result);
-}
-
-
-DEFINE_NATIVE_ENTRY(DateNatives_getMinutes, 2) {
-  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
-  BrokenDownDate broken_down;
-  bool succeeded =
-      BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  const Smi& result = Smi::Handle(Smi::New(broken_down.minutes));
-  arguments->SetReturn(result);
-}
-
-
-DEFINE_NATIVE_ENTRY(DateNatives_getSeconds, 2) {
-  GET_NATIVE_ARGUMENT(Integer, dart_seconds, arguments->At(0));
-  GET_NATIVE_ARGUMENT(Bool, dart_is_utc, arguments->At(1));
-  BrokenDownDate broken_down;
-  bool succeeded =
-      BreakDownSecondsSinceEpoch(dart_seconds, dart_is_utc, &broken_down);
-  if (!succeeded) {
-    UNIMPLEMENTED();
-  }
-  const Smi& result = Smi::Handle(Smi::New(broken_down.seconds));
-  arguments->SetReturn(result);
-}
-
 }  // namespace dart