blob: 86c5c3823f9c8c00e7eed002f64233390ec903c8 [file] [log] [blame]
/*
* 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.
*/
#pragma once
#include <array>
#include <wtf/HashFunctions.h>
#include <wtf/text/WTFString.h>
namespace JSC {
class NumericStrings {
public:
ALWAYS_INLINE const String& add(double d)
{
CacheEntry<double>& entry = lookup(d);
if (d == entry.key && !entry.value.isNull())
return entry.value;
entry.key = d;
entry.value = String::numberToStringECMAScript(d);
return entry.value;
}
ALWAYS_INLINE const String& add(int i)
{
if (static_cast<unsigned>(i) < cacheSize)
return lookupSmallString(static_cast<unsigned>(i));
CacheEntry<int>& entry = lookup(i);
if (i == entry.key && !entry.value.isNull())
return entry.value;
entry.key = i;
entry.value = String::number(i);
return entry.value;
}
ALWAYS_INLINE const String& add(unsigned i)
{
if (i < cacheSize)
return lookupSmallString(static_cast<unsigned>(i));
CacheEntry<unsigned>& entry = lookup(i);
if (i == entry.key && !entry.value.isNull())
return entry.value;
entry.key = i;
entry.value = String::number(i);
return entry.value;
}
private:
static const size_t cacheSize = 64;
template<typename T>
struct CacheEntry {
T key;
String value;
};
CacheEntry<double>& lookup(double d) { return doubleCache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
CacheEntry<int>& lookup(int i) { return intCache[WTF::IntHash<int>::hash(i) & (cacheSize - 1)]; }
CacheEntry<unsigned>& lookup(unsigned i) { return unsignedCache[WTF::IntHash<unsigned>::hash(i) & (cacheSize - 1)]; }
ALWAYS_INLINE const String& lookupSmallString(unsigned i)
{
ASSERT(i < cacheSize);
if (smallIntCache[i].isNull())
smallIntCache[i] = String::number(i);
return smallIntCache[i];
}
std::array<CacheEntry<double>, cacheSize> doubleCache;
std::array<CacheEntry<int>, cacheSize> intCache;
std::array<CacheEntry<unsigned>, cacheSize> unsignedCache;
std::array<String, cacheSize> smallIntCache;
};
} // namespace JSC