From 33c276d0b4904f5f7c00502d46422cb9e84555e4 Mon Sep 17 00:00:00 2001
From: Alex Orlenko <zxteam@protonmail.com>
Date: Sat, 4 Mar 2023 11:58:34 +0000
Subject: [PATCH] Optimize userdata methods call when __index and
 fields_getters are nil

---
 src/util.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/util.rs b/src/util.rs
index f736a41..a34c2b2 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -409,11 +409,17 @@ unsafe fn init_userdata_metatable_index(state: *mut ffi::lua_State) -> Result<()
     }
     ffi::lua_pop(state, 1);
 
-    // Create and cache `__index` helper
+    // Create and cache `__index` generator
     let code = cstr!(
         r#"
             local error, isfunction = ...
             return function (__index, field_getters, methods)
+                -- Fastpath to return methods table for index access
+                if __index == nil and field_getters == nil then
+                    return methods
+                end
+
+                -- Alternatively return a function for index access
                 return function (self, key)
                     if field_getters ~= nil then
                         local field_getter = field_getters[key]
@@ -463,7 +469,7 @@ pub unsafe fn init_userdata_metatable_newindex(state: *mut ffi::lua_State) -> Re
     }
     ffi::lua_pop(state, 1);
 
-    // Create and cache `__newindex` helper
+    // Create and cache `__newindex` generator
     let code = cstr!(
         r#"
             local error, isfunction = ...