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/*
* Copyright (C) 2018 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 "Opcode.h"
#include "OpcodeSize.h"
namespace JSC {
struct Instruction {
struct Metadata { };
protected:
Instruction()
{ }
private:
template<OpcodeSize Width>
class Impl {
public:
OpcodeID opcodeID() const { return static_cast<OpcodeID>(m_opcode); }
private:
typename TypeBySize<Width>::type m_opcode;
};
public:
OpcodeID opcodeID() const
{
if (isWide())
return wide()->opcodeID();
return narrow()->opcodeID();
}
const char* name() const
{
return opcodeNames[opcodeID()];
}
bool isWide() const
{
return narrow()->opcodeID() == op_wide;
}
size_t size() const
{
auto wide = isWide();
auto padding = wide ? 1 : 0;
auto size = wide ? 4 : 1;
return opcodeLengths[opcodeID()] * size + padding;
}
template<class T>
bool is() const
{
return opcodeID() == T::opcodeID;
}
template<class T>
T as() const
{
ASSERT(is<T>());
return T::decode(reinterpret_cast<const uint8_t*>(this));
}
template<class T>
T* cast()
{
ASSERT(is<T>());
return bitwise_cast<T*>(this);
}
template<class T>
const T* cast() const
{
ASSERT(is<T>());
return reinterpret_cast<const T*>(this);
}
const Impl<OpcodeSize::Narrow>* narrow() const
{
return reinterpret_cast<const Impl<OpcodeSize::Narrow>*>(this);
}
const Impl<OpcodeSize::Wide>* wide() const
{
ASSERT(isWide());
return reinterpret_cast<const Impl<OpcodeSize::Wide>*>(bitwise_cast<uintptr_t>(this) + 1);
}
};
} // namespace JSC