enum {
  ASS_INT = 1, // =
  MIN_INT = 2, // -
  ADD_INT = 3, // +
  MUL_INT = 4, // *
  DIV_INT = 5, // /

  EQ_INT = 20, // ==
  LT_INT = 21, // <
  LE_INT = 22, // <=
  GT_INT = 23, // >
  GE_INT = 24, // >=

  JUMP = 100,
  RETURN = 101,
};

struct vm_Machine {
  struct vm_Stack *stack; // global memory
  struct vm_Function *func; // global functions
};

struct vm_Stack {
  char *memory;
  int bytes;
};

struct vm_Function {
  struct vm_Stack p_stack; // parameter storage
  struct vm_Stack v_stack; // "static" storage - i.e., explicitly defined numbers
  struct vm_Stack stack; // 
  struct vm_Operation *ops; // array of ops
  int op_size;
};

struct vm_Operation {
  int op;
  char *stack_a;
  int pos_a;
  char *stack_b;
  int pos_b;
};