mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-09 02:10:43 +00:00
96 lines
3.4 KiB
C++
96 lines
3.4 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 <array>
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#include <wtf/HashFunctions.h>
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#include <wtf/text/WTFString.h>
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namespace JSC {
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class NumericStrings {
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public:
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ALWAYS_INLINE const String& add(double d)
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{
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CacheEntry<double>& entry = lookup(d);
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if (d == entry.key && !entry.value.isNull())
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return entry.value;
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entry.key = d;
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entry.value = String::number(d);
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return entry.value;
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}
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ALWAYS_INLINE const String& add(int i)
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{
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if (static_cast<unsigned>(i) < cacheSize)
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return lookupSmallString(static_cast<unsigned>(i));
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CacheEntry<int>& entry = lookup(i);
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if (i == entry.key && !entry.value.isNull())
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return entry.value;
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entry.key = i;
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entry.value = String::number(i);
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return entry.value;
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}
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ALWAYS_INLINE const String& add(unsigned i)
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{
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if (i < cacheSize)
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return lookupSmallString(static_cast<unsigned>(i));
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CacheEntry<unsigned>& entry = lookup(i);
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if (i == entry.key && !entry.value.isNull())
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return entry.value;
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entry.key = i;
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entry.value = String::number(i);
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return entry.value;
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}
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private:
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static const size_t cacheSize = 64;
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template<typename T>
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struct CacheEntry {
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T key;
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String value;
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};
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CacheEntry<double>& lookup(double d) { return doubleCache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
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CacheEntry<int>& lookup(int i) { return intCache[WTF::IntHash<int>::hash(i) & (cacheSize - 1)]; }
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CacheEntry<unsigned>& lookup(unsigned i) { return unsignedCache[WTF::IntHash<unsigned>::hash(i) & (cacheSize - 1)]; }
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ALWAYS_INLINE const String& lookupSmallString(unsigned i)
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{
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ASSERT(i < cacheSize);
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if (smallIntCache[i].isNull())
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smallIntCache[i] = String::number(i);
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return smallIntCache[i];
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}
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std::array<CacheEntry<double>, cacheSize> doubleCache;
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std::array<CacheEntry<int>, cacheSize> intCache;
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std::array<CacheEntry<unsigned>, cacheSize> unsignedCache;
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std::array<String, cacheSize> smallIntCache;
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};
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} // namespace JSC
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