EightBit/M6502/inc/Disassembly.h

#pragma once

#include <map>
#include <cstdint>

#include "mos6502.h"
#include "Symbols.h"

namespace EightBit {
	class Disassembly {
	public:
		Disassembly(MOS6502& processor, const Symbols& symbols);

		std::string dump_Flags(uint8_t value) const;
		std::string dump_ByteValue(uint8_t value) const;
		std::string dump_WordValue(uint16_t value) const;

		std::string disassemble(uint16_t current) const;

	private:
		MOS6502& processor;
		const Symbols& symbols;

		mutable uint16_t m_address;

		std::string disassemble_Implied(const std::string& instruction) const {
			return "\t" + instruction;
		}

		std::string disassemble_Absolute(const std::string& instruction) const {
			return AM_Absolute_dump() + "\t" + instruction + " " + AM_Absolute();
		}

		std::string disassemble_Indirect(const std::string& instruction) const {
			return AM_Absolute_dump() + "\t" + instruction + " (" + AM_Absolute() + ")";
		}

		std::string disassemble_Relative(const std::string& instruction, uint16_t address) const {
			return AM_Immediate_dump() + "\t" + instruction + " $" + dump_WordValue(address);
		}

		std::string disassemble_AM_00(int bbb, const std::string& instruction) const {
			return AM_00_dump(bbb) + "\t" + instruction + " " + AM_00(bbb);
		}

		std::string disassemble_AM_01(int bbb, const std::string& instruction) const {
			return AM_01_dump(bbb) + "\t" + instruction + " " + AM_01(bbb);
		}

		std::string disassemble_AM_10(int bbb, const std::string& instruction) const {
			return AM_10_dump(bbb) + "\t" + instruction + " " + AM_10(bbb);
		}

		std::string disassemble_AM_10_x(int bbb, const std::string& instruction) const {
			return AM_10_x_dump(bbb) + "\t" + instruction + " " + AM_10_x(bbb);
		}

#pragma region 6502 addressing modes

#pragma region References

		std::string AM_Immediate_dump() const {
			return dump_Byte(m_address + 1);
		}

		std::string AM_Immediate() const {
			return "#" + AM_Immediate_dump();
		}

		std::string AM_Absolute_dump() const {
			return dump_DByte(m_address + 1);
		}

		std::string AM_Absolute() const {
			return "$" + dump_WordValue(processor.BUS().peekWord(m_address + 1));
		}

		std::string AM_ZeroPage_dump() const {
			return dump_Byte(m_address + 1);
		}

		std::string AM_ZeroPage() const {
			return "$" + dump_Byte(m_address + 1);
		}

		std::string AM_ZeroPageX_dump() const {
			return AM_ZeroPage_dump();
		}

		std::string AM_ZeroPageX() const {
			return AM_ZeroPage() + ",X";
		}

		std::string AM_ZeroPageY_dump() const {
			return AM_ZeroPage_dump();
		}

		std::string AM_ZeroPageY() const {
			return AM_ZeroPage() + ",Y";
		}

		std::string AM_AbsoluteX_dump() const {
			return AM_Absolute_dump();
		}

		std::string AM_AbsoluteX() const {
			return AM_Absolute() + ",X";
		}

		std::string AM_AbsoluteY_dump() const {
			return AM_Absolute_dump();
		}

		std::string AM_AbsoluteY() const {
			return AM_Absolute() + ",Y";
		}

		std::string AM_IndexedIndirectX_dump() const {
			return AM_ZeroPage_dump();
		}

		std::string AM_IndexedIndirectX() const {
			return "($" + dump_Byte(m_address + 1) + ",X)";
		}

		std::string AM_IndirectIndexedY_dump() const {
			return AM_ZeroPage_dump();
		}

		std::string AM_IndirectIndexedY() const {
			return "($" + dump_Byte(m_address + 1) + "),Y";
		}

#pragma endregion References

#pragma region 6502 addressing mode switching

		std::string AM_00_dump(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_Immediate_dump();
			case 0b001:
				return AM_ZeroPage_dump();
			case 0b011:
				return AM_Absolute_dump();
			case 0b101:
				return AM_ZeroPageX_dump();
			case 0b111:
				return AM_AbsoluteX_dump();
			case 0b010:
			case 0b100:
			case 0b110:
				throw std::domain_error("Illegal addressing mode");
			default:
				__assume(0);
			}
		}

		std::string AM_00(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_Immediate();
			case 0b001:
				return AM_ZeroPage();
			case 0b011:
				return AM_Absolute();
			case 0b101:
				return AM_ZeroPageX();
			case 0b111:
				return AM_AbsoluteX();
			case 0b010:
			case 0b100:
			case 0b110:
				throw std::domain_error("Illegal addressing mode");
			default:
				__assume(0);
			}
		}

		std::string AM_01_dump(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_IndexedIndirectX_dump();
			case 0b001:
				return AM_ZeroPage_dump();
			case 0b010:
				return AM_Immediate_dump();
			case 0b011:
				return AM_Absolute_dump();
			case 0b100:
				return AM_IndirectIndexedY_dump();
			case 0b101:
				return AM_ZeroPageX_dump();
			case 0b110:
				return AM_AbsoluteY_dump();
			case 0b111:
				return AM_AbsoluteX_dump();
			default:
				__assume(0);
			}
		}

		std::string AM_01(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_IndexedIndirectX();
			case 0b001:
				return AM_ZeroPage();
			case 0b010:
				return AM_Immediate();
			case 0b011:
				return AM_Absolute();
			case 0b100:
				return AM_IndirectIndexedY();
			case 0b101:
				return AM_ZeroPageX();
			case 0b110:
				return AM_AbsoluteY();
			case 0b111:
				return AM_AbsoluteX();
			default:
				__assume(0);
			}
		}

		std::string AM_10_dump(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_Immediate_dump();
			case 0b001:
				return AM_ZeroPage_dump();
			case 0b010:
				return "";
			case 0b011:
				return AM_Absolute_dump();
			case 0b101:
				return AM_ZeroPageX_dump();
			case 0b111:
				return AM_AbsoluteX_dump();
			case 0b100:
			case 0b110:
				throw std::domain_error("Illegal addressing mode");
			default:
				__assume(0);
			}
		}

		std::string AM_10(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_Immediate();
			case 0b001:
				return AM_ZeroPage();
			case 0b010:
				return "A";
			case 0b011:
				return AM_Absolute();
			case 0b101:
				return AM_ZeroPageX();
			case 0b111:
				return AM_AbsoluteX();
			case 0b100:
			case 0b110:
				throw std::domain_error("Illegal addressing mode");
			default:
				__assume(0);
			}
		}

		std::string AM_10_x_dump(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_Immediate_dump();
			case 0b001:
				return AM_ZeroPage_dump();
			case 0b010:
				return "";
			case 0b011:
				return AM_Absolute_dump();
			case 0b101:
				return AM_ZeroPageY_dump();
			case 0b111:
				return AM_AbsoluteY_dump();
			case 0b100:
			case 0b110:
				throw std::domain_error("Illegal addressing mode");
			default:
				__assume(0);
			}
		}

		std::string AM_10_x(int bbb) const {
			switch (bbb) {
			case 0b000:
				return AM_Immediate();
			case 0b001:
				return AM_ZeroPage();
			case 0b010:
				return "A";
			case 0b011:
				return AM_Absolute();
			case 0b101:
				return AM_ZeroPageY();
			case 0b111:
				return AM_AbsoluteY();
			case 0b100:
			case 0b110:
				throw std::domain_error("Illegal addressing mode");
			default:
				__assume(0);
			}
		}

#pragma endregion 6502 addressing mode switching

#pragma endregion 6502 addressing modes

		uint8_t getByte(uint16_t address) const;

		std::string dump_Byte(uint16_t address) const;
		std::string dump_DByte(uint16_t address) const;

		std::string convertAddress(uint16_t address) const;
		std::string convertAddress(uint8_t address) const;
		std::string convertConstant(uint16_t constant) const;
		std::string convertConstant(uint8_t constant) const;
	};
}