https://git.ruby-lang.org/ruby.git/commit/?id=f3dddd77a9

From f3dddd77a925f576acb6abab9b37e8839f028412 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <tenderlove@r...>
Date: Tue, 22 Sep 2020 09:19:42 -0700
Subject: Add a comment about why we're checking the finalizer table


diff --git a/gc.c b/gc.c
index 5e84f51..d9c8731 100644
--- a/gc.c
+++ b/gc.c
@@ -7861,6 +7861,11 @@ gc_is_moveable_obj(rb_objspace_t *objspace, VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L7861
       case T_NODE:
       case T_CLASS:
         if (FL_TEST(obj, FL_FINALIZE)) {
+            /* The finalizer table is a numtable. It looks up objects by address.
+             * We can't mark the keys in the finalizer table because that would
+             * prevent the objects from being collected.  This check prevents
+             * objects that are keys in the finalizer table from being moved
+             * without directly pinning them. */
             if (st_is_member(finalizer_table, obj)) {
                 return FALSE;
             }
-- 
cgit v0.10.2


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