#ifndef RZ_VM_H
#define RZ_VM_H

#include "commons.h"
#include "opcodes.h"
#include "mod.h"
#include "err.h"
#include "tysy.h"
#include "sym.h"

typedef struct {
  int id;
  param_t addr;
} local_t;

typedef struct stack_frame{
  struct frame* prev;

  param_t stack[RZ_STACK_LIMIT];
  size_t pc;
  size_t bp;
  size_t sp;

  struct {
    size_t size;
    size_t cap;
    local_t** data;
  } locals;
} frame_t;

typedef struct {
  sym_t* sym;
  tysy_t* tysy;
  err_t* err;
  frame_t* top_frame;
} vm_t;

void vm_init(vm_t* vm, sym_t* sym, tysy_t* tysy, err_t* err);
void vm_free(vm_t* vm);

void vm_frame_init(frame_t* frame);
void vm_frame_free(frame_t* frame);

void vm_frame_push(vm_t* vm);
int vm_frame_pop(vm_t* vm);

local_t* vm_try_local_load(vm_t* vm, int id);
void vm_local_store(vm_t* vm, int id, param_t addr);

void vm_push_new_value(vm_t* vm, mod_t* mod, value_t* value);
void vm_push(vm_t* vm, param_t param);
param_t vm_pop(vm_t* vm);

size_t vm_stack_str(vm_t* vm, char* buffer, size_t size);

int vm_exec_mod(vm_t* vm, mod_t* mod);
int vm_exec_instr(vm_t* vm, mod_t* mod, Opcode op, param_t param);
void vm_ensure_type(vm_t* vm, value_t* value, TypeKind want);

#endif