/* * 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>*>((uintptr_t)this + 1); } }; } // namespace JSC