CLK/InstructionSets/M50740/Decoder.hpp

//
//  Decoder.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 15/01/21.
//  Copyright © 2021 Thomas Harte. All rights reserved.
//

#pragma once

#include "Instruction.hpp"

#include <cstddef>
#include <utility>

namespace InstructionSet::M50740 {

class Decoder {
	public:
		std::pair<int, Instruction> decode(const uint8_t *source, size_t length);
		Instruction instrucion_for_opcode(uint8_t opcode);

	private:
		enum class Phase {
			Instruction,
			AwaitingOperand,
			ReadyToPost
		} phase_ = Phase::Instruction;
		int operand_size_ = 0, operand_bytes_ = 0;
		int consumed_ = 0;
		Instruction instr_;
};

}