Changed the each_object callback so that a pointer is passed for the object, instead of the struct.

include/mruby/gc.h

 /*
-** gc.c - garbage collector for mruby
+** gc.h - garbage collector for mruby
 **
 ** See Copyright Notice in mruby.h
 */
@@ -7,18 +7,10 @@
 #ifndef MRUBY_GC_H
 #define MRUBY_GC_H
 
-#if defined(__cplusplus)
-extern "C" {
-#endif
-
 #include "mruby.h"
 #include "mruby/value.h"
 
-typedef int each_object_callback(mrb_state *mrb, struct RBasic obj, void *data);
+typedef int each_object_callback(mrb_state *mrb, struct RBasic* obj, void *data);
 void mrb_objspace_each_objects(mrb_state *mrb, each_object_callback* callback, void *data);
 
-#if defined(__cplusplus)
-}  /* extern "C" { */
-#endif
-
 #endif  /* MRUBY_GC_H */

mrbgems/mruby-objectspace/src/mruby_objectspace.c

@@ -31,12 +31,12 @@ struct os_count_struct {
   size_t counts[MRB_TT_MAXDEFINE+1];
 };
 
-void os_count_object_type(mrb_state *mrb, struct RBasic obj, void *data)
+void os_count_object_type(mrb_state *mrb, struct RBasic* obj, void *data)
 {
   struct os_count_struct* obj_count;
   obj_count = (struct os_count_struct*)(data);
-  obj_count->counts[mrb_type(obj)]++;
-  if (is_dead(mrb, &obj))
+  obj_count->counts[obj->tt]++;
+  if (is_dead(mrb, obj))
   {
   	obj_count->freed++;
   }

src/gc.c

@@ -1153,7 +1153,7 @@ mrb_objspace_each_objects(mrb_state *mrb, each_object_callback* callback, void *
         p = page->objects;
         pend = p + MRB_HEAP_PAGE_SIZE;
         for (;p < pend; p++) {
-           callback(mrb, p->as.basic, data);
+           callback(mrb, &p->as.basic, data);
         }
 
         page = page->next;