YJIT: Add a live ISeq counter

It's an estimator for application size and could be used as a
compilation heuristic later.

Co-authored-by: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@shopify.com>
Co-authored-by: Takashi Kokubun <takashikkbn@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/yjit.h b/yjit.h
index 84a3655156..33b9214952 100644
--- a/yjit.h
+++ b/yjit.h
@@ -27,6 +27,7 @@
 // Expose these as declarations since we are building YJIT.
 extern uint64_t rb_yjit_call_threshold;
 extern uint64_t rb_yjit_cold_threshold;
+extern uint64_t rb_yjit_live_iseq_count;
 void rb_yjit_incr_counter(const char *counter_name);
 bool rb_yjit_enabled_p(void);
 bool rb_yjit_compile_new_iseqs(void);