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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
* Copyright (C) 2012 the V8 project authors. 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/DebugHeap.h>
#include <wtf/TZoneMalloc.h>
namespace JSC {
DECLARE_ALLOCATOR_WITH_HEAP_IDENTIFIER_AND_EXPORT(StringSplitCache, WTF_INTERNAL);
class JSImmutableButterfly;
class StringSplitCache {
WTF_MAKE_TZONE_ALLOCATED(StringSplitCache);
WTF_MAKE_NONCOPYABLE(StringSplitCache);
public:
static constexpr unsigned cacheSize = 64;
StringSplitCache() = default;
struct Entry {
RefPtr<AtomStringImpl> m_subject { nullptr };
RefPtr<AtomStringImpl> m_separator { nullptr };
JSImmutableButterfly* m_butterfly { nullptr };
};
JSImmutableButterfly* get(const String& subject, const String& separator);
void set(const String& subject, const String& separator, JSImmutableButterfly*);
void clear()
{
m_entries.fill(Entry { });
}
private:
std::array<Entry, cacheSize> m_entries { };
};
} // namespace JSC
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