#ifndef fk_VM_HPP
#define fk_VM_HPP

#include "commons.hpp"
#include "Program.hpp"

namespace fk
{
  struct Frame {
    std::shared_ptr<Program> program;
  };

  class VM
  {
  public:
    explicit VM();
    virtual ~VM();

    Frame frame() const { return m_frames.back(); }

    void mount(std::shared_ptr<Program> program);
    void run();

    std::string string() const;
  private:
    addr_t m_pc = 0;
    std::vector<Frame> m_frames;
    std::vector<addr_t> m_stack;

    void push(addr_t addr);
    addr_t top();
    addr_t pop();
  };
}

#endif