#ifndef _ENCODING_H_
#define _ENCODING_H_

#include <stdbool.h>
#include <stdint.h>

#include "slice.h"
#include "value.h"

typedef uint8_t local;

// An arg can be a value or a constant.
struct arg {
	local local;
	value constant;
};

enum opcode {
	OALLOC = 1,
	OCALL = 2,
	OPOKE = 3,
	OPEEK = 4,
	OSHUF = 5,
	OEXIT = 6,
};

struct op {
	enum opcode code;
	union {
		struct {
			local out;
			struct arg size;
		} alloc;
		struct {
			uint8_t offset;
			local pointer;
			struct arg value;
		} poke;
		struct {
			local out;
			uint8_t offset;
			struct arg value;
		} peek;
		struct {
			local out;
			struct arg value;
		} shuf;
		struct {
			struct arg value;
		} exit;
	};
};

struct result {
	struct op op;
	int n;
};

struct result parse(struct slice);

#endif