| /* |
| * 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 JSOpcodeTraits { |
| using OpcodeID = ::JSC::OpcodeID; |
| static constexpr OpcodeID numberOfBytecodesWithMetadata = static_cast<OpcodeID>(NUMBER_OF_BYTECODE_WITH_METADATA); |
| static constexpr OpcodeID wide16 = op_wide16; |
| static constexpr OpcodeID wide32 = op_wide32; |
| static constexpr const unsigned* opcodeLengths = ::JSC::opcodeLengths; |
| static constexpr const char* const* opcodeNames = ::JSC::opcodeNames; |
| }; |
| |
| struct WasmOpcodeTraits { |
| using OpcodeID = WasmOpcodeID; |
| static constexpr OpcodeID numberOfBytecodesWithMetadata = static_cast<OpcodeID>(NUMBER_OF_WASM_WITH_METADATA); |
| static constexpr OpcodeID wide16 = wasm_wide16; |
| static constexpr OpcodeID wide32 = wasm_wide32; |
| static constexpr const unsigned* opcodeLengths = wasmOpcodeLengths; |
| static constexpr const char* const* opcodeNames = wasmOpcodeNames; |
| }; |
| |
| |
| template<typename Opcode> |
| struct BaseInstruction { |
| |
| struct Metadata { }; |
| |
| protected: |
| BaseInstruction() |
| { } |
| |
| private: |
| template<OpcodeSize Width> |
| class Impl { |
| public: |
| template<typename Traits = JSOpcodeTraits> |
| typename Traits::OpcodeID opcodeID() const { return static_cast<typename Traits::OpcodeID>(m_opcode); } |
| |
| private: |
| typename TypeBySize<Width>::unsignedType m_opcode; |
| }; |
| |
| public: |
| template<typename Traits = JSOpcodeTraits> |
| typename Traits::OpcodeID opcodeID() const |
| { |
| if (isWide32<Traits>()) |
| return wide32<Traits>()->template opcodeID<Traits>(); |
| if (isWide16<Traits>()) |
| return wide16<Traits>()->template opcodeID<Traits>(); |
| return narrow()->template opcodeID<Traits>(); |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| const char* name() const |
| { |
| return Traits::opcodeNames[opcodeID()]; |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| bool isWide16() const |
| { |
| return narrow()->template opcodeID<Traits>() == Traits::wide16; |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| bool isWide32() const |
| { |
| return narrow()->template opcodeID<Traits>() == Traits::wide32; |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| bool hasMetadata() const |
| { |
| return opcodeID<Traits>() < Traits::numberOfBytecodesWithMetadata; |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| int sizeShiftAmount() const |
| { |
| if (isWide32<Traits>()) |
| return 2; |
| if (isWide16<Traits>()) |
| return 1; |
| return 0; |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| size_t size() const |
| { |
| auto sizeShiftAmount = this->sizeShiftAmount<Traits>(); |
| auto padding = sizeShiftAmount ? 1 : 0; |
| auto size = 1 << sizeShiftAmount; |
| return Traits::opcodeLengths[opcodeID<Traits>()] * size + padding; |
| } |
| |
| template<class T, typename Traits = JSOpcodeTraits> |
| bool is() const |
| { |
| return opcodeID<Traits>() == T::opcodeID; |
| } |
| |
| template<class T, typename Traits = JSOpcodeTraits> |
| T as() const |
| { |
| ASSERT((is<T, Traits>())); |
| return T::decode(reinterpret_cast<const uint8_t*>(this)); |
| } |
| |
| template<class T, typename Traits = JSOpcodeTraits> |
| T* cast() |
| { |
| ASSERT((is<T, Traits>())); |
| return bitwise_cast<T*>(this); |
| } |
| |
| template<class T, typename Traits = JSOpcodeTraits> |
| const T* cast() const |
| { |
| ASSERT((is<T, Traits>())); |
| return reinterpret_cast<const T*>(this); |
| } |
| |
| const Impl<OpcodeSize::Narrow>* narrow() const |
| { |
| return reinterpret_cast<const Impl<OpcodeSize::Narrow>*>(this); |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| const Impl<OpcodeSize::Wide16>* wide16() const |
| { |
| |
| ASSERT(isWide16<Traits>()); |
| return reinterpret_cast<const Impl<OpcodeSize::Wide16>*>(bitwise_cast<uintptr_t>(this) + 1); |
| } |
| |
| template<typename Traits = JSOpcodeTraits> |
| const Impl<OpcodeSize::Wide32>* wide32() const |
| { |
| |
| ASSERT(isWide32<Traits>()); |
| return reinterpret_cast<const Impl<OpcodeSize::Wide32>*>(bitwise_cast<uintptr_t>(this) + 1); |
| } |
| }; |
| |
| struct Instruction : public BaseInstruction<OpcodeID> { |
| }; |
| |
| struct WasmInstance : public BaseInstruction<WasmOpcodeID> { |
| }; |
| |
| } // namespace JSC |