//
// Created by Kosho on 2020年8月15日.
//

#ifndef PYTHONVM_INTERPRETER_HPP
#define PYTHONVM_INTERPRETER_HPP

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

class FrameObject;

class HiDict;

class OopClosure;

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();

public:
 static Interpreter *get_instance();

 void initialize();

 void run(CodeObject *codes);

 HiDict *run_mod(CodeObject *codes, HiString *mod_name);

 void build_frame(HiObject *pObject, ObjList args, int op_arg);

 void enter_frame(FrameObject *frame);

 void eval_frame();

 void destroy_frame();

 void leave_frame();

 HiObject *call_virtual(HiObject *func, ObjList args);

 HiObject *eval_generator(Generator *g);

 /**
 * 抛出异常
 *
 * @param exc 异常类型
 * @param val 异常实例
 * @param tb 异常堆栈
 * @return 状态
 */
 Status do_raise(HiObject *exc, HiObject *val, HiObject *tb);

 void oops_do(OopClosure *f);
};

#endif //PYTHONVM_INTERPRETER_HPP