From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- js/src/vm/DateObject.h | 101 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 101 insertions(+) create mode 100644 js/src/vm/DateObject.h (limited to 'js/src/vm/DateObject.h') diff --git a/js/src/vm/DateObject.h b/js/src/vm/DateObject.h new file mode 100644 index 0000000000..48ee8934a0 --- /dev/null +++ b/js/src/vm/DateObject.h @@ -0,0 +1,101 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef vm_DateObject_h_ +#define vm_DateObject_h_ + +#include "js/Date.h" +#include "js/Value.h" +#include "vm/DateTime.h" +#include "vm/NativeObject.h" + +namespace js { + +class DateObject : public NativeObject { + // Time in milliseconds since the (Unix) epoch. + static const uint32_t UTC_TIME_SLOT = 0; + + // Raw time zone offset in seconds, i.e. without daylight saving adjustment, + // of the current system zone. + // + // This value is exclusively used to verify the cached slots are still valid. + // + // It is NOT the return value of Date.prototype.getTimezoneOffset()! + static const uint32_t UTC_TIME_ZONE_OFFSET_SLOT = 1; + + /* + * Cached slots holding local properties of the date. + * These are undefined until the first actual lookup occurs + * and are reset to undefined whenever the date's time is modified. + */ + static const uint32_t COMPONENTS_START_SLOT = 2; + + static const uint32_t LOCAL_TIME_SLOT = COMPONENTS_START_SLOT + 0; + static const uint32_t LOCAL_YEAR_SLOT = COMPONENTS_START_SLOT + 1; + static const uint32_t LOCAL_MONTH_SLOT = COMPONENTS_START_SLOT + 2; + static const uint32_t LOCAL_DATE_SLOT = COMPONENTS_START_SLOT + 3; + static const uint32_t LOCAL_DAY_SLOT = COMPONENTS_START_SLOT + 4; + + /* + * Unlike the above slots that hold LocalTZA-adjusted component values, + * LOCAL_SECONDS_INTO_YEAR_SLOT holds a composite value that can be used + * to compute LocalTZA-adjusted hours, minutes, and seconds values. + * Specifically, LOCAL_SECONDS_INTO_YEAR_SLOT holds the number of + * LocalTZA-adjusted seconds into the year. Unix timestamps ignore leap + * seconds, so recovering hours/minutes/seconds requires only trivial + * division/modulus operations. + */ + static const uint32_t LOCAL_SECONDS_INTO_YEAR_SLOT = + COMPONENTS_START_SLOT + 5; + + static const uint32_t RESERVED_SLOTS = LOCAL_SECONDS_INTO_YEAR_SLOT + 1; + + public: + static const JSClass class_; + static const JSClass protoClass_; + + js::DateTimeInfo::ShouldRFP shouldRFP() const; + + JS::ClippedTime clippedTime() const { + double t = getFixedSlot(UTC_TIME_SLOT).toDouble(); + JS::ClippedTime clipped = JS::TimeClip(t); + MOZ_ASSERT(mozilla::NumbersAreIdentical(clipped.toDouble(), t)); + return clipped; + } + + const js::Value& UTCTime() const { return getFixedSlot(UTC_TIME_SLOT); } + const js::Value& localTime() const { + return getReservedSlot(LOCAL_TIME_SLOT); + } + + // Set UTC time to a given time and invalidate cached local time. + void setUTCTime(JS::ClippedTime t); + void setUTCTime(JS::ClippedTime t, MutableHandleValue vp); + + // Cache the local time, year, month, and so forth of the object. + // If UTC time is not finite (e.g., NaN), the local time + // slots will be set to the UTC time without conversion. + void fillLocalTimeSlots(); + + const js::Value& localYear() const { + return getReservedSlot(LOCAL_YEAR_SLOT); + } + const js::Value& localMonth() const { + return getReservedSlot(LOCAL_MONTH_SLOT); + } + const js::Value& localDate() const { + return getReservedSlot(LOCAL_DATE_SLOT); + } + const js::Value& localDay() const { return getReservedSlot(LOCAL_DAY_SLOT); } + + const js::Value& localSecondsIntoYear() const { + return getReservedSlot(LOCAL_SECONDS_INTO_YEAR_SLOT); + } +}; + +} // namespace js + +#endif // vm_DateObject_h_ -- cgit v1.2.3