diff --git a/core/include/blue/core/object.h b/core/include/blue/core/object.h
index a9b75b9..3063420 100644
--- a/core/include/blue/core/object.h
+++ b/core/include/blue/core/object.h
@@ -2,22 +2,21 @@
 #define BLUE_CORE_OBJECT_H_
 
 #include <blue/core/misc.h>
-#include <blue/core/stringstream.h>
 #include <blue/core/type.h>
 
-#define B_OBJECT_MAGIC 0xDECAFC0C0ABEEF13ULL
+#define B_OBJECT_MAGIC      0xDECAFC0C0ABEEF13ULL
 
-#define B_OBJECT(p)    ((b_object *)(p))
-#define B_TYPE_OBJECT  (b_object_get_type())
+#define B_OBJECT(p)         ((b_object *)(p))
+#define B_TYPE_OBJECT       (b_object_get_type())
 
-#define B_RV(p)        (b_object_make_rvalue(p))
+#define B_TYPE_FWDREF(name) struct _b_object
 
-struct b_stream;
+#define B_RV(p)             (b_object_make_rvalue(p))
 
-typedef struct _b_object b_object;
+typedef B_TYPE_FWDREF(b_object) b_object;
 
 typedef struct _b_object_class {
-	void (*to_string)(const b_object *, struct b_stream *);
+	void (*to_string)(const b_object *, B_TYPE_FWDREF(b_stream) *);
 } b_object_class;
 
 BLUE_API b_type b_object_get_type(void);
@@ -25,13 +24,16 @@ BLUE_API b_type b_object_get_type(void);
 BLUE_API void *b_object_get_private(const b_object *object, b_type type);
 BLUE_API void *b_object_get_protected(const b_object *object, b_type type);
 BLUE_API void *b_object_get_interface(const b_object *object, b_type type);
+BLUE_API b_status b_object_get_data(
+	const b_object *object, b_type type, void **priv, void **prot,
+	void **iface);
 
 BLUE_API b_object *b_object_ref(b_object *p);
 BLUE_API void b_object_unref(b_object *p);
 BLUE_API b_object *b_object_make_rvalue(b_object *p);
 
 BLUE_API b_object *b_object_create(b_type type);
-BLUE_API void b_object_to_string(const b_object *p, struct b_stream *out);
+BLUE_API void b_object_to_string(const b_object *p, B_TYPE_FWDREF(b_stream) * out);
 BLUE_API bool b_object_is_type(const b_object *p, b_type type);
 
 #endif
diff --git a/core/object.c b/core/object.c
index 8e9cd45..2d8016e 100644
--- a/core/object.c
+++ b/core/object.c
@@ -5,6 +5,7 @@
 #include <blue/core/class.h>
 #include <blue/core/macros.h>
 #include <blue/core/object.h>
+#include <blue/core/stream.h>
 #include <blue/core/thread.h>
 
 B_TYPE_CLASS_DEFINITION_BEGIN(b_object)
@@ -71,9 +72,9 @@ struct _b_object *b_object_create(b_type type)
 	return out;
 }
 
-void b_object_to_string(const struct _b_object *p, struct b_stream *out)
+void b_object_to_string(const struct _b_object *p, b_stream *out)
 {
-	B_CLASS_DISPATCH_VIRTUAL_V(b_object, B_TYPE_OBJECT, p, to_string, p, out);
+	B_CLASS_DISPATCH_VIRTUAL_V(b_object, B_TYPE_OBJECT, to_string, p, out);
 	b_stream_write_fmt(out, NULL, "<%s@%p>", p->obj_type->r_info->t_name, p);
 }
 
@@ -120,6 +121,32 @@ void *b_object_get_interface(const struct _b_object *object, b_type type)
 	return b_class_get_interface(object->obj_type->r_class, type);
 }
 
+enum b_status b_object_get_data(
+	const struct _b_object *object, b_type type, void **priv, void **prot,
+	void **iface)
+{
+	struct b_type_component *comp
+		= b_type_get_component(&object->obj_type->r_components, type);
+	if (!comp) {
+		return B_ERR_INVALID_ARGUMENT;
+	}
+
+	if (priv) {
+		*priv = (char *)object + comp->c_instance_private_data_offset;
+	}
+
+	if (prot) {
+		*prot = (char *)object + comp->c_instance_protected_data_offset;
+	}
+
+	if (iface) {
+		*iface = (char *)object->obj_type->r_class
+		       + comp->c_class_data_offset;
+	}
+
+	return B_SUCCESS;
+}
+
 struct _b_object *b_object_ref(struct _b_object *p)
 {
 	p->obj_ref++;