Implement rb_gc_impl_copy_attributes

gc/mmtk.c

@@ -1,5 +1,3 @@
-// clang -I.. -L mmtk/target/debug -lmmtk_ruby -undefined dynamic_lookup -g -O3 -dynamiclib -o ../build/libgc.mmtk.dylib mmtk.c
-
 #include <pthread.h>
 #include <stdbool.h>
 
@@ -1247,7 +1245,16 @@ rb_gc_impl_garbage_object_p(void *objspace_ptr, VALUE obj)
 }
 
 void rb_gc_impl_set_event_hook(void *objspace_ptr, const rb_event_flag_t event) { }
-void rb_gc_impl_copy_attributes(void *objspace_ptr, VALUE dest, VALUE obj) { }
+
+void
+rb_gc_impl_copy_attributes(void *objspace_ptr, VALUE dest, VALUE obj)
+{
+ if (mmtk_object_wb_unprotected_p((MMTk_ObjectReference)obj)) {
+ rb_gc_impl_writebarrier_unprotect(objspace_ptr, dest);
+ }
+
+ rb_gc_impl_copy_finalizer(objspace_ptr, dest, obj);
+}
 
 // GC Identification
 

gc/mmtk.h

@@ -129,6 +129,8 @@ void mmtk_object_reference_write_post(MMTk_Mutator *mutator, MMTk_ObjectReferenc
 
 void mmtk_register_wb_unprotected_object(MMTk_ObjectReference object);
 
+bool mmtk_object_wb_unprotected_p(MMTk_ObjectReference object);
+
 void mmtk_enumerate_objects(void (*callback)(MMTk_ObjectReference, void*), void *data);
 
 struct MMTk_RawVecOfObjRef mmtk_get_all_obj_free_candidates(void);

gc/mmtk/src/api.rs

@@ -168,6 +168,11 @@ pub extern "C" fn mmtk_register_wb_unprotected_object(object: ObjectReference) {
  crate::binding().register_wb_unprotected_object(object)
 }
 
+#[no_mangle]
+pub extern "C" fn mmtk_object_wb_unprotected_p(object: ObjectReference) -> bool {
+ crate::binding().object_wb_unprotected_p(object)
+}
+
 // =============== Heap walking ===============
 
 #[no_mangle]

gc/mmtk/src/binding.rs

@@ -134,7 +134,7 @@ impl RubyBinding {
  objects.insert(object);
  }
 
- pub fn is_object_wb_unprotected(&self, object: ObjectReference) -> bool {
+ pub fn object_wb_unprotected_p(&self, object: ObjectReference) -> bool {
  let objects = self.wb_unprotected_objects.lock().unwrap();
  objects.contains(&object)
  }