mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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92 lines
3.2 KiB
C++
92 lines
3.2 KiB
C++
/*
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* Copyright (C) 2009 Apple Inc. All Rights Reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "PureNaN.h"
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#include <array>
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#include <wtf/GregorianDateTime.h>
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#include <wtf/HashFunctions.h>
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#include <wtf/RefCounted.h>
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namespace JSC {
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class DateInstanceData : public RefCounted<DateInstanceData> {
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public:
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static Ref<DateInstanceData> create() { return adoptRef(*new DateInstanceData); }
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static ptrdiff_t offsetOfGregorianDateTimeCachedForMS() { return OBJECT_OFFSETOF(DateInstanceData, m_gregorianDateTimeCachedForMS); }
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static ptrdiff_t offsetOfCachedGregorianDateTime() { return OBJECT_OFFSETOF(DateInstanceData, m_cachedGregorianDateTime); }
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static ptrdiff_t offsetOfGregorianDateTimeUTCCachedForMS() { return OBJECT_OFFSETOF(DateInstanceData, m_gregorianDateTimeUTCCachedForMS); }
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static ptrdiff_t offsetOfCachedGregorianDateTimeUTC() { return OBJECT_OFFSETOF(DateInstanceData, m_cachedGregorianDateTimeUTC); }
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double m_gregorianDateTimeCachedForMS { PNaN };
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GregorianDateTime m_cachedGregorianDateTime;
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double m_gregorianDateTimeUTCCachedForMS { PNaN };
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GregorianDateTime m_cachedGregorianDateTimeUTC;
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private:
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DateInstanceData() = default;
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};
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class DateInstanceCache {
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public:
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DateInstanceCache()
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{
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reset();
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}
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void reset()
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{
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for (size_t i = 0; i < cacheSize; ++i)
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m_cache[i].key = PNaN;
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}
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DateInstanceData* add(double d)
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{
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CacheEntry& entry = lookup(d);
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if (d == entry.key)
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return entry.value.get();
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entry.key = d;
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entry.value = DateInstanceData::create();
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return entry.value.get();
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}
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private:
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static const size_t cacheSize = 16;
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struct CacheEntry {
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double key;
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RefPtr<DateInstanceData> value;
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};
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CacheEntry& lookup(double d) { return m_cache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
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std::array<CacheEntry, cacheSize> m_cache;
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};
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} // namespace JSC
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