#ifndef _vm_h
#define _vm_h

#include <stddef.h>
#include <stdlib.h>
#include <stdint.h>

typedef struct _thread Thread;

#include "val.h"
#include "state.h"

typedef struct {
	struct {
		size_t len;
		size_t cap;
		uint8_t *d;
	} bc;
	struct {
		size_t len;
		size_t cap;
		Val *d;
	} consts;
} Chunk;
Chunk chunk_new(State *S);
size_t chunk_wbc(State *S, Chunk *ch, uint8_t byte);
size_t chunk_wconst(State *S, Chunk *ch, Val v);

#define STACKSIZE 128
typedef struct _thread {
	Chunk *ch;
	size_t ip;
	Val stack[STACKSIZE];
	size_t sp;
} Thread;
Thread thread_new(State *S);

typedef enum {
	OP_RET,
	OP_LOADK,
	OP_PRINT,

	OP_ADD,
	OP_SUB,
	OP_MUL,
	OP_DIV,

	OP_DROP,

	OP_GETGLOBAL,
	OP_SETGLOBAL,

	OP_TRUE,
	OP_FALSE,
	OP_NIL,

	OP_0BRANCH,
	OP_SKIP,
	OP_REDO,
} Op;

int runvm(State *S);

#endif