1 /* PyObject_HEAD defines the initial segment of every PyObject. */
   2 #define PyObject_HEAD                   \
   3         _PyObject_HEAD_EXTRA            \
   4         int ob_refcnt;                  \
   5         struct _typeobject *ob_type;
   6 
   7 #define PyObject_HEAD_INIT(type)        \
   8         _PyObject_EXTRA_INIT            \
   9         1, type,
  10 

   1 /* Nothing is actually declared to be a PyObject, but every pointer to
   2  * a Python object can be cast to a PyObject*.  This is inheritance built
   3  * by hand.  Similarly every pointer to a variable-size Python object can,
   4  * in addition, be cast to PyVarObject*.
   5  */
   6 typedef struct _object {
   7         PyObject_HEAD
   8 } PyObject;

   1 #define Py_INCREF(op) (                         \
   2         _Py_INC_REFTOTAL  _Py_REF_DEBUG_COMMA   \
   3         (op)->ob_refcnt++)
   4 
   5 #define Py_DECREF(op)                                   \
   6         if (_Py_DEC_REFTOTAL  _Py_REF_DEBUG_COMMA       \
   7             --(op)->ob_refcnt != 0)                     \
   8                 _Py_CHECK_REFCNT(op)                    \
   9         else                                            \
  10                 _Py_Dealloc((PyObject *)(op))
  11