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/*
* Copyright (C) 2008-2021 Apple Inc. All rights reserved.
* Copyright (C) 2008 Cameron Zwarich <cwzwarich@uwaterloo.ca>
*
* 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.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE 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 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 "CodeLocation.h"
#include "UnlinkedCodeBlock.h"
#include <wtf/FixedVector.h>
#include <wtf/RobinHoodHashMap.h>
#include <wtf/Vector.h>
#include <wtf/text/StringHash.h>
#include <wtf/text/StringImpl.h>
namespace JSC {
#if ENABLE(JIT)
struct StringJumpTable {
FixedVector<CodeLocationLabel<JSSwitchPtrTag>> m_ctiOffsets;
void ensureCTITable(const UnlinkedStringJumpTable& unlinkedTable)
{
if (!isEmpty())
return;
m_ctiOffsets = FixedVector<CodeLocationLabel<JSSwitchPtrTag>>(unlinkedTable.m_offsetTable.size() + 1);
}
inline CodeLocationLabel<JSSwitchPtrTag> ctiForValue(const UnlinkedStringJumpTable& unlinkedTable, StringImpl* value) const
{
auto loc = unlinkedTable.m_offsetTable.find(value);
if (loc == unlinkedTable.m_offsetTable.end())
return m_ctiOffsets[unlinkedTable.m_offsetTable.size()];
return m_ctiOffsets[loc->value.m_indexInTable];
}
CodeLocationLabel<JSSwitchPtrTag> ctiDefault() const { return m_ctiOffsets.last(); }
bool isEmpty() const { return m_ctiOffsets.isEmpty(); }
};
struct SimpleJumpTable {
FixedVector<CodeLocationLabel<JSSwitchPtrTag>> m_ctiOffsets;
CodeLocationLabel<JSSwitchPtrTag> m_ctiDefault;
void ensureCTITable(const UnlinkedSimpleJumpTable& unlinkedTable)
{
if (!isEmpty())
return;
m_ctiOffsets = FixedVector<CodeLocationLabel<JSSwitchPtrTag>>(unlinkedTable.m_branchOffsets.size());
}
inline CodeLocationLabel<JSSwitchPtrTag> ctiForValue(int32_t min, int32_t value) const
{
if (value >= min && static_cast<uint32_t>(value - min) < m_ctiOffsets.size())
return m_ctiOffsets[value - min];
return m_ctiDefault;
}
bool isEmpty() const { return m_ctiOffsets.isEmpty(); }
};
#endif
} // namespace JSC
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