From 4219cb7adb0240fa92cd044b2feebb66b7702ca1 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@ruby-lang.org>
Date: Mon, 9 Nov 2020 11:59:18 -0800
Subject: Add debug counter for ivar inline cache misses that could hit

This commit adds a debug counter for the case where the inline cache
*missed* but the ivar index table has an entry for that ivar.  This is a
case where a polymorphic cache could help
---
 vm_insnhelper.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'vm_insnhelper.c')

diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index ea25de629f..74e992a500 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1246,6 +1246,7 @@ vm_setivar(VALUE obj, ID id, VALUE val, const rb_iseq_t *iseq, IVC ic, const str
                     ptr = ROBJECT_IVPTR(obj);
                 }
                 RB_OBJ_WRITE(obj, &ptr[index], val);
+                RB_DEBUG_COUNTER_INC(ivar_set_ic_miss_iv_hit);
 
                 return val;
 	    }
-- 
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