From 88e0c64ffc158a91a4d68a68b96e3df3260ab1b3 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 9 Apr 2022 09:26:39 +0900
Subject: [PATCH] class.c: fix bugs in inline method cache.

---
 src/class.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/class.c b/src/class.c
index 68a0ff084..214aa0204 100644
--- a/src/class.c
+++ b/src/class.c
@@ -151,9 +151,11 @@ mt_get(mrb_state *mrb, mt_tbl *t, mrb_sym sym, union mt_ptr *pp)
   hash = kh_int_hash_func(mrb, sym);
 #ifdef MRB_USE_INLINE_METHOD_CACHE
   int cpos = (hash^(uintptr_t)t) % MT_CACHE_SIZE;
+  mrb_sym key;
   pos = mt_cache[cpos];
-  if (cpos < t->alloc && t->table[cpos].key == sym) {
-    return &t->table[cpos];
+  if (cpos < t->alloc && key = keys[pos] && MT_KEY_SYM(key) == sym) {
+    *pp = vals[pos];
+    return key;
   }
 #endif
   start = pos = hash & (t->alloc-1);
@@ -162,7 +164,7 @@ mt_get(mrb_state *mrb, mt_tbl *t, mrb_sym sym, union mt_ptr *pp)
     if (MT_KEY_SYM(key) == sym) {
       *pp = vals[pos];
 #ifdef MRB_USE_INLINE_METHOD_CACHE
-      if (pos < 0xff) {
+      if (pos < 0x100) {
         mt_cache[cpos] = pos;
       }
 #endif