From aa7eb97d062e260f0d704b78e93c470ac8444129 Mon Sep 17 00:00:00 2001
From: Peter Zhu <peter@peterzhu.ca>
Date: Thu, 8 Jan 2026 19:09:59 -0500
Subject: [PATCH] [ruby/mmtk] Add MMTK_ASSERT

https://github.com/ruby/mmtk/commit/e34d5cf32f
---
 gc/mmtk/mmtk.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/gc/mmtk/mmtk.c b/gc/mmtk/mmtk.c
index 38e730a376..7b70ddff5e 100644
--- a/gc/mmtk/mmtk.c
+++ b/gc/mmtk/mmtk.c
@@ -83,6 +83,12 @@ RB_THREAD_LOCAL_SPECIFIER VALUE marking_parent_object;
 # error We currently need language-supported TLS
 #endif
 
+#ifdef MMTK_DEBUG
+# define MMTK_ASSERT(expr, ...) RUBY_ASSERT_ALWAYS(expr, #expr RBIMPL_VA_OPT_ARGS(__VA_ARGS__))
+#else
+# define MMTK_ASSERT(expr, ...) ((void)0)
+#endif
+
 #include <pthread.h>
 
 static void