| 1 | /*
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| 2 | * Copyright (C) 2009 Apple Inc. All Rights Reserved.
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| 3 | *
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| 4 | * Redistribution and use in source and binary forms, with or without
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| 5 | * modification, are permitted provided that the following conditions
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| 6 | * are met:
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| 7 | * 1. Redistributions of source code must retain the above copyright
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| 8 | * notice, this list of conditions and the following disclaimer.
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| 9 | * 2. Redistributions in binary form must reproduce the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer in the
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| 11 | * documentation and/or other materials provided with the distribution.
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| 12 | *
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| 13 | * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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| 14 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 16 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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| 17 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 18 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 19 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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| 20 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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| 21 | * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 22 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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| 23 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 24 | */
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| 25 |
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| 26 | #ifndef DateInstanceCache_h
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| 27 | #define DateInstanceCache_h
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| 28 |
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| 29 | #include <wtf/DateMath.h>
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| 30 | #include <wtf/HashFunctions.h>
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| 31 | #include <wtf/PassRefPtr.h>
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| 32 | #include <wtf/RefCounted.h>
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| 33 |
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| 34 | namespace JSC {
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| 35 |
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| 36 | extern const double NaN;
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| 37 |
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| 38 | class DateInstanceData : public RefCounted<DateInstanceData> {
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| 39 | public:
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| 40 | static PassRefPtr<DateInstanceData> create() { return adoptRef(new DateInstanceData); }
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| 41 |
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| 42 | double m_gregorianDateTimeCachedForMS;
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| 43 | GregorianDateTime m_cachedGregorianDateTime;
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| 44 | double m_gregorianDateTimeUTCCachedForMS;
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| 45 | GregorianDateTime m_cachedGregorianDateTimeUTC;
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| 46 |
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| 47 | private:
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| 48 | DateInstanceData()
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| 49 | : m_gregorianDateTimeCachedForMS(NaN)
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| 50 | , m_gregorianDateTimeUTCCachedForMS(NaN)
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| 51 | {
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| 52 | }
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| 53 | };
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| 54 |
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| 55 | class DateInstanceCache {
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| 56 | public:
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| 57 | DateInstanceCache()
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| 58 | {
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| 59 | for (size_t i = 0; i < cacheSize; ++i)
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| 60 | m_cache[i].key = NaN;
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| 61 | }
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| 62 |
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| 63 | DateInstanceData* add(double d)
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| 64 | {
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| 65 | CacheEntry& entry = lookup(d);
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| 66 | if (d == entry.key)
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| 67 | return entry.value.get();
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| 68 |
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| 69 | entry.key = d;
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| 70 | entry.value = DateInstanceData::create();
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| 71 | return entry.value.get();
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| 72 | }
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| 73 |
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| 74 | private:
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| 75 | static const size_t cacheSize = 64;
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| 76 |
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| 77 | struct CacheEntry {
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| 78 | double key;
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| 79 | RefPtr<DateInstanceData> value;
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| 80 | };
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| 81 |
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| 82 | CacheEntry& lookup(double d) { return m_cache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
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| 83 |
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| 84 | CacheEntry m_cache[cacheSize];
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| 85 | };
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| 86 |
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| 87 | } // namespace JSC
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| 88 |
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| 89 | #endif // DateInstanceCache_h
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