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26 #ifndef DateInstanceCache_h
27 #define DateInstanceCache_h
29 #include "JSDateMath.h"
30 #include <wtf/FixedArray.h>
31 #include <wtf/HashFunctions.h>
32 #include <wtf/PassRefPtr.h>
33 #include <wtf/RefCounted.h>
37 class DateInstanceData : public RefCounted<DateInstanceData> {
39 static PassRefPtr<DateInstanceData> create() { return adoptRef(new DateInstanceData); }
41 double m_gregorianDateTimeCachedForMS;
42 GregorianDateTime m_cachedGregorianDateTime;
43 double m_gregorianDateTimeUTCCachedForMS;
44 GregorianDateTime m_cachedGregorianDateTimeUTC;
48 : m_gregorianDateTimeCachedForMS(std::numeric_limits<double>::quiet_NaN())
49 , m_gregorianDateTimeUTCCachedForMS(std::numeric_limits<double>::quiet_NaN())
54 class DateInstanceCache {
63 for (size_t i = 0; i < cacheSize; ++i)
64 m_cache[i].key = std::numeric_limits<double>::quiet_NaN();
67 DateInstanceData* add(double d)
69 CacheEntry& entry = lookup(d);
71 return entry.value.get();
74 entry.value = DateInstanceData::create();
75 return entry.value.get();
79 static const size_t cacheSize = 16;
83 RefPtr<DateInstanceData> value;
86 CacheEntry& lookup(double d) { return m_cache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
88 FixedArray<CacheEntry, cacheSize> m_cache;
93 #endif // DateInstanceCache_h