From 21efe9e25920bdb7210f1b7944a4b6be150f1e71 Mon Sep 17 00:00:00 2001
From: David Chisnall <theraven@theravensnest.org>
Date: Tue, 23 May 2017 09:24:44 +0100
Subject: [PATCH] Update dtables for metaclasses when exchanging methods.

Fixes #32
---
 runtime.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/runtime.c b/runtime.c
index 27a8725..c7e7c62 100644
--- a/runtime.c
+++ b/runtime.c
@@ -104,6 +104,12 @@ static void objc_updateDtableForClassContainingMethod(Method m)
 			objc_update_dtable_for_class(nextClass);
 			return;
 		}
+		Class meta = object_getClass((id)nextClass);
+		if (class_getInstanceMethodNonrecursive(meta, sel) == m)
+		{
+			objc_update_dtable_for_class(meta);
+			return;
+		}
 	}
 }