From 6012145299cfa4ab561360c78710c7f2941a7e9d Mon Sep 17 00:00:00 2001
From: Matt Valentine-House <matt@eightbitraptor.com>
Date: Mon, 31 Mar 2025 11:38:16 +0100
Subject: [PATCH] Mark rb_io_buffer_type references declaratively

allowing them to support compaction and be moved.
---
 io_buffer.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/io_buffer.c b/io_buffer.c
index a4b7d30018..140571bdbc 100644
--- a/io_buffer.c
+++ b/io_buffer.c
@@ -272,13 +272,6 @@ io_buffer_free(struct rb_io_buffer *buffer)
 #endif
 }
 
-void
-rb_io_buffer_type_mark(void *_buffer)
-{
-    struct rb_io_buffer *buffer = _buffer;
-    rb_gc_mark(buffer->source);
-}
-
 void
 rb_io_buffer_type_free(void *_buffer)
 {
@@ -300,15 +293,20 @@ rb_io_buffer_type_size(const void *_buffer)
     return total;
 }
 
+RUBY_REFERENCES(io_buffer_refs) = {
+    RUBY_REF_EDGE(struct rb_io_buffer, source),
+    RUBY_REF_END
+};
+
 static const rb_data_type_t rb_io_buffer_type = {
     .wrap_struct_name = "IO::Buffer",
     .function = {
-        .dmark = rb_io_buffer_type_mark,
+        .dmark = RUBY_REFS_LIST_PTR(io_buffer_refs),
         .dfree = rb_io_buffer_type_free,
         .dsize = rb_io_buffer_type_size,
     },
     .data = NULL,
-    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_EMBEDDABLE,
+    .flags = RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED | RUBY_TYPED_EMBEDDABLE | RUBY_TYPED_DECL_MARKING,
 };
 
 static inline enum rb_io_buffer_flags