nesemu/cpu/decoding.h

//
// Created by william on 1/9/24.
//

#ifndef NESEMULATOR_DECODING_H
#define NESEMULATOR_DECODING_H

#include "../include/types.h"
#include "../include/system.h"
#include "cpu.h"

typedef enum {
    ADDR_MODE_ABSOLUTE,             // a
    ADDR_MODE_ABSOLUTE_INDEXED_X,   // a,x
    ADDR_MODE_ABSOLUTE_INDEXED_Y,   // a,y
    ADDR_MODE_ACCUMULATOR,          // A
    ADDR_MODE_IMMEDIATE,            // #i
    ADDR_MODE_IMPLICIT,             // Imp
    ADDR_MODE_INDIRECT_X,     // (d,x)
    ADDR_MODE_INDIRECT_JUMP,        //
    ADDR_MODE_INDIRECT_Y,     // (d),y
    ADDR_MODE_RELATIVE,             // label
    ADDR_MODE_ZERO_PAGE,            // d
    ADDR_MODE_ZERO_PAGE_INDEXED_X,  // d,x
    ADDR_MODE_ZERO_PAGE_INDEXED_Y,  // d,y
} AddressingMode;

enum OperandType {
    OPERAND_TYPE_ACCUMULATOR,
    OPERAND_TYPE_IMMEDIATE,
    OPERAND_TYPE_ADDRESS
};

typedef struct {
    word value;
    enum OperandType type;
    bool is_page_crossing;
} Operand;

address decode_operand_addr(AddressingMode addr_mode, bool *page_crossing);

Operand decode_operand(AddressingMode addr_mode);

byte read_operand(Operand operand);

char *get_addr_mode_name(AddressingMode addr_mode);

char *operand_name(Operand *operand);

char *get_op_code_name(byte op);

#endif //NESEMULATOR_DECODING_H