Refactor VM root modules

This `st_table` is used to both mark and pin classes
defined from the C API. But `vm->mark_object_ary` already
does both much more efficiently.

Currently a Ruby process starts with 252 rooted classes,
which uses `7224B` in an `st_table` or `2016B` in an `RArray`.

So a baseline of 5kB saved, but since `mark_object_ary` is
preallocated with `1024` slots but only use `405` of them,
it's a net `7kB` save.

`vm->mark_object_ary` is also being refactored.

Prior to this changes, `mark_object_ary` was a regular `RArray`, but
since this allows for references to be moved, it was marked a second
time from `rb_vm_mark()` to pin these objects.

This has the detrimental effect of marking these references on every
minors even though it's a mostly append only list.

But using a custom TypedData we can save from having to mark
all the references on minor GC runs.

Addtionally, immediate values are now ignored and not appended
to `vm->mark_object_ary` as it's just wasted space.

1 files changed, 1 insertions, 1 deletions

diff --git a/proc.c b/proc.c
index 5b67567189..a67fc64a32 100644
--- a/proc.c
+++ b/proc.c
@@ -1462,7 +1462,7 @@ rb_sym_to_proc(VALUE sym)
 
     if (!sym_proc_cache) {
         sym_proc_cache = rb_ary_hidden_new(SYM_PROC_CACHE_SIZE * 2);
-        rb_gc_register_mark_object(sym_proc_cache);
+        rb_vm_register_global_object(sym_proc_cache);
         rb_ary_store(sym_proc_cache, SYM_PROC_CACHE_SIZE*2 - 1, Qnil);
     }