From fbe229906b6e55c2e7bb1e68452d5c225503b9ca Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Tue, 17 Dec 2019 13:14:52 +0900
Subject: add debug counter to count `call` reusing cases.

---
 debug_counter.h | 1 +
 vm_insnhelper.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/debug_counter.h b/debug_counter.h
index 35ffe08c8d..ea045a81e4 100644
--- a/debug_counter.h
+++ b/debug_counter.h
@@ -46,6 +46,7 @@ RB_DEBUG_COUNTER(mc_miss_by_distinct)
 RB_DEBUG_COUNTER(mc_miss_by_refine)
 RB_DEBUG_COUNTER(mc_miss_by_visi)
 RB_DEBUG_COUNTER(mc_miss_spurious)
+RB_DEBUG_COUNTER(mc_miss_reuse_call)
 
 /*
  * call cache fastpath usage
diff --git a/vm_insnhelper.c b/vm_insnhelper.c
index e7e20ee3ca..efd297d506 100644
--- a/vm_insnhelper.c
+++ b/vm_insnhelper.c
@@ -1458,6 +1458,7 @@ calccall(const struct rb_call_data *cd, const rb_callable_method_entry_t *me)
     }
     else {
         RB_DEBUG_COUNTER_INC(mc_miss_spurious);
+        (void)RB_DEBUG_COUNTER_INC_IF(mc_miss_reuse_call, cc->call != vm_call_general);
         return cc->call;
     }
 }
-- 
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