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/*
* Copyright (C) 2025 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. AND ITS CONTRIBUTORS ``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 ITS 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 "ConcatKeyAtomStringCache.h"
#include "Identifier.h"
#include "SmallStrings.h"
#include "VM.h"
namespace JSC {
template<typename Func>
inline JSString* ConcatKeyAtomStringCache::getOrInsert(VM& vm, JSString* s0, JSString* s1, JSString* s2, const Func& func)
{
JSString* variable = nullptr;
switch (m_mode) {
case Mode::Variable0: {
variable = s0;
break;
}
case Mode::Variable1: {
variable = s1;
break;
}
case Mode::Variable2: {
variable = s2;
break;
}
case Mode::Megamorphic: {
return nullptr;
}
}
auto value = variable->tryGetValue();
SUPPRESS_UNCOUNTED_LOCAL auto* impl = value->impl();
if (!impl)
return nullptr;
if (!impl->isAtom())
return nullptr;
SUPPRESS_UNCOUNTED_LOCAL auto& atomStringImpl = *static_cast<AtomStringImpl*>(impl);
if (atomStringImpl.length() > maxStringLengthForCache)
return nullptr;
if (auto* result = m_cache.get(atomStringImpl))
return result;
if (auto* result = func(vm)) [[likely]] {
size_t size = m_cache.size();
if (size == maxCapacity) [[unlikely]] {
{
Locker locker { m_lock };
m_cache.clear();
}
m_mode = Mode::Megamorphic;
} else {
{
Locker locker { m_lock };
m_cache.add(atomStringImpl, result);
}
vm.writeBarrier(m_owner, result);
if (size < 2) {
auto& entry = m_quickCache[size];
entry.m_key.set(vm, m_owner, variable);
entry.m_value.set(vm, m_owner, result);
}
}
return result;
}
return nullptr;
}
} // namespace JSC
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