[ruby/mmtk] Clear slot when object is freed

peterzhu2118 · matzbot · commit 2daed3c02258 · 2026-01-12T22:23:34.000Z
ruby/mmtk@87290e45b2
diff --git a/gc/mmtk/mmtk.c b/gc/mmtk/mmtk.c
@@ -330,6 +330,11 @@ rb_mmtk_call_obj_free(MMTk_ObjectReference object)
     }
 
     rb_gc_obj_free(objspace, obj);
+
+    // TODO: uncomment this when done debugging
+// #ifdef MMTK_DEBUG
+    memset((void *)obj, 0, rb_gc_impl_obj_slot_size(obj));
+// #endif
 }
 
 static size_t

Original file line number	Diff line number	Diff line change
`@@ -330,6 +330,11 @@ rb_mmtk_call_obj_free(MMTk_ObjectReference object)`
`330`	`330`	`}`
`331`	`331`
`332`	`332`	`rb_gc_obj_free(objspace, obj);`
	`333`	`+`
	`334`	`+ // TODO: uncomment this when done debugging`
	`335`	`+// #ifdef MMTK_DEBUG`
	`336`	`+ memset((void *)obj, 0, rb_gc_impl_obj_slot_size(obj));`
	`337`	`+// #endif`
`333`	`338`	`}`
`334`	`339`
`335`	`340`	`static size_t`