#ifndef INTERPRETER_HPP
#define INTERPRETER_HPP

#include "code/bytecode.hpp"
#include "code/codeObject.hpp"

class FrameObject;
class HiDict;
class OopClosure;
class ModuleObject;
class Generator;

class Interpreter {
 enum Status {
 IS_OK,
 IS_BREAK,
 IS_CONTINUE,
 IS_EXCEPTION,
 IS_RETURN,
 IS_YIELD,
 };

private:
 ModuleObject* _builtins;
 HiDict* _modules;
 FrameObject* _frame;
 HiObject* _ret_value;

 HiObject* _exception_class;
 HiObject* _pending_exception;
 HiObject* _trace_back;
 Status _int_status;

 static Interpreter* _instance;
 Interpreter();

 void destroy_frame ();

public:
 static Interpreter* get_instance();
 void initialize();

 void run (CodeObject* codes);
 HiDict* run_mod (CodeObject* codes, HiString* mod_name);
 void build_frame (HiObject* callable, ObjList args, int op_arg);
 void enter_frame (FrameObject* frame);
 void eval_frame ();
 void leave_frame ();
 HiObject* eval_generator (Generator* g);
 HiObject* call_virtual (HiObject* func, ObjList args);
 Status do_raise (HiObject* exc, HiObject* val, HiObject* tb);

 void oops_do (OopClosure* f);
};

#endif