| /* |
| * Copyright (C) 2009 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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. |
| */ |
| |
| #ifndef DateInstanceCache_h |
| #define DateInstanceCache_h |
| |
| #include "JSDateMath.h" |
| #include <wtf/FixedArray.h> |
| #include <wtf/HashFunctions.h> |
| #include <wtf/PassRefPtr.h> |
| #include <wtf/RefCounted.h> |
| |
| namespace JSC { |
| |
| class DateInstanceData : public RefCounted<DateInstanceData> { |
| public: |
| static PassRefPtr<DateInstanceData> create() { return adoptRef(new DateInstanceData); } |
| |
| double m_gregorianDateTimeCachedForMS; |
| GregorianDateTime m_cachedGregorianDateTime; |
| double m_gregorianDateTimeUTCCachedForMS; |
| GregorianDateTime m_cachedGregorianDateTimeUTC; |
| |
| private: |
| DateInstanceData() |
| : m_gregorianDateTimeCachedForMS(QNaN) |
| , m_gregorianDateTimeUTCCachedForMS(QNaN) |
| { |
| } |
| }; |
| |
| class DateInstanceCache { |
| public: |
| DateInstanceCache() |
| { |
| reset(); |
| } |
| |
| void reset() |
| { |
| for (size_t i = 0; i < cacheSize; ++i) |
| m_cache[i].key = QNaN; |
| } |
| |
| DateInstanceData* add(double d) |
| { |
| CacheEntry& entry = lookup(d); |
| if (d == entry.key) |
| return entry.value.get(); |
| |
| entry.key = d; |
| entry.value = DateInstanceData::create(); |
| return entry.value.get(); |
| } |
| |
| private: |
| static const size_t cacheSize = 16; |
| |
| struct CacheEntry { |
| double key; |
| RefPtr<DateInstanceData> value; |
| }; |
| |
| CacheEntry& lookup(double d) { return m_cache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; } |
| |
| FixedArray<CacheEntry, cacheSize> m_cache; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // DateInstanceCache_h |