Function enter_lua_debugger

src/Chain/libraries/glua/lvm.cpp:833–927

	return &g_debug_infos;
}
static int enter_lua_debugger(lua_State *L)
{
	LuaDebuggerInfoList *debugger_info = get_lua_debugger_info_list_in_state(L);
	if (!debugger_info)
		return 0;
	if (lua_gettop(L) > 0 && lua_isstring(L, 1))
	{
		// if has string parameter, use this function to get the value of the name in running debugger;
		auto found = debugger_info->find(luaL_checkstring(L, 1));
		if (found == debugger_info->end())
			return 0;
		return 0;
	}

	debugger_info->clear();
	g_debug_running = true;

	// get all info snapshot in current lua_State stack
	// and then pause the thread(but other thread can use this lua_State
	// maybe you want to start a REPL before real enter debugger

	// first need back to caller func frame

	CallInfo *ci = L->ci;
	auto old_l_top = L->top;
	CallInfo *oci = ci->previous;
	Proto *np = getproto(ci->func);
	Proto *p = getproto(oci->func);
	LClosure *ocl = clLvalue(oci->func);
	int real_localvars_count = (int)(ci->func - oci->func - 1);
	int linedefined = p->linedefined;
	// fprintf(L->out, "debugging into line %d\n", linedefined); // FIXME: logging the debugging code line
	L->ci = oci; // FIXME: 考虑不直接复制ci，改成类似函数入栈出栈的方式
	int top = lua_gettop(L);

	// capture locals vars and values(need get localvar name from whereelse)
	for (int i = 0; i < top; ++i)
	{
		luaL_tojsonstring(L, i + 1, nullptr);
		const char *value_str = luaL_checkstring(L, -1);
		lua_pop(L, 1);
		// if the debugger position is before the localvar position, ignore the next localvars
		if (i >= real_localvars_count) // the localvars is after the debugger() call
			break;
		// get local var name
		if (i < p->sizelocvars)
		{
			LocVar localvar = p->locvars[i];
			const char *varname = getstr(localvar.varname);

			if (std::string(value_str) != "nil") // 考虑到还没用用到的var也会表现为nil，这里不输出nil值的变量
			{
				fprintf(L->out, "[debugger]%s=%s\n", varname, value_str);
			}
			debugger_info->insert(std::make_pair(varname, std::make_pair(value_str, false)));
			if(remote_debugger)
			{
				remote_debugger->set_last_lvm_debugger_status(varname, value_str, false);