#pragma once
#include "VM/VM.h"

///@param program_pos position in vm->program next afrer opcode
///@returns number of bytes read
typedef i32 (*InstructionImplFunc_t)(VM* vm);

typedef enum __attribute__((__packed__)) Opcode {
    Opcode_NOP,
    Opcode_EXIT,
    Opcode_SYS,

    Opcode_MOVC,
    Opcode_MOVR,

    Opcode_ADD,
    Opcode_SUB,
    Opcode_MUL,
    Opcode_DIV,
    Opcode_MOD,

    Opcode_EQ,
    Opcode_NE,
    Opcode_LT,
    Opcode_LE,
    Opcode_GT,
    Opcode_GE,
    Opcode_NOT,
    Opcode_INV,
    Opcode_OR,
    Opcode_XOR,
    Opcode_AND,
    
    Opcode_JMP,
    Opcode_JNZ,
    Opcode_JZ,
} Opcode;

typedef struct Instruction {
    str name;
    InstructionImplFunc_t implementation;
    Opcode opcode;
} Instruction;

#define Instruction_construct(NAME) {\
    .name = STR(#NAME), \
    .implementation = NAME##_impl, \
    .opcode = Opcode_##NAME\
}

/// @brief get instruction info from table
/// @param opcode any byte
/// @return ptr to struct or NULL
const Instruction* NULLABLE(Instruction_getByOpcode)(Opcode opcode);
const Instruction* NULLABLE(Instruction_getByName)(str name);
void Instruction_destroySearchStructs();