https://git.ruby-lang.org/ruby.git/commit/?id=e2e70f69f3

From e2e70f69f3af939b0ba687424b6a30043de2ea9e Mon Sep 17 00:00:00 2001
From: Maxime Chevalier-Boisvert <maxime.chevalierboisvert@s...>
Date: Thu, 12 Nov 2020 14:25:11 -0500
Subject: Add comment wrt getivar and allocators

---
 ujit_compile.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ujit_compile.c b/ujit_compile.c
index 923eb85e19..2520932ad1 100644
--- a/ujit_compile.c
+++ b/ujit_compile.c
@@ -636,6 +636,9 @@ gen_getinstancevariable(codeblock_t* cb, codeblock_t* ocb, ctx_t* ctx) https://github.com/ruby/ruby/blob/trunk/ujit_compile.c#L636
     }
 
     // If the class uses the default allocator, instances should all be T_OBJECT
+    // NOTE: This assumes nobody changes the allocator of the class after allocation.
+    //       Eventually, we can encode whether an object is T_OBJECT or not
+    //       inside object shapes.
     if (rb_get_alloc_func(ic->entry->class_value) != rb_class_allocate_instance)
     {
         return false;
-- 
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