#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"
#include "program.h"
#include "heap.h"
#include "locals.h"

typedef struct stack_frame{
  struct frame* prev;
  program_t* program;
  value_t* stack[RZ_STACK_LIMIT];
  int allocated[RZ_STACK_LIMIT];
  size_t pc;
  size_t bp;
  size_t sp;
  fun_t* fun;
  locals_t* locals;

  struct {
    size_t size;
    size_t cap;
    value_t** data;
  } alloc;

} frame_t;

typedef struct {
  sym_t* sym;
  tysy_t* tysy;
  err_t* err;
  frame_t* top_frame;
  heap_t heap;
  locals_t locals;
} 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, fun_t* fun);
int vm_frame_pop(vm_t* vm);

void vm_push_new(vm_t* vm, value_t* value);
void vm_push(vm_t* vm, value_t* value);
value_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, Opcode op, param_t param);
void vm_ensure_type(vm_t* vm, value_t* value, TypeKind want);

void vm_push_alloc(frame_t* frame, value_t* value);
void vm_clear_alloc(frame_t* frame);

#endif