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Macros and static inline functions of the public C API which access directly PyTypeObject fields. There may be more.
#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize )
static inline vectorcallfunc
PyVectorcall_Function(PyObject *callable)
{
 ...
 tp = Py_TYPE(callable);
 offset = tp->tp_vectorcall_offset;
 ...
}
#define PyObject_CheckBuffer(obj) \
 ((Py_TYPE(obj)->tp_as_buffer != NULL) && \
 (Py_TYPE(obj)->tp_as_buffer->bf_getbuffer != NULL))
#define PyIndex_Check(obj) \
 (Py_TYPE(obj)->tp_as_number != NULL && \
 Py_TYPE(obj)->tp_as_number->nb_index != NULL)
#define PyObject_GET_WEAKREFS_LISTPTR(o) \
 ((PyObject **) (((char *) (o)) + Py_TYPE(o)->tp_weaklistoffset))
static inline int
PyType_HasFeature(PyTypeObject *type, unsigned long feature) {
#ifdef Py_LIMITED_API
 return ((PyType_GetFlags(type) & feature) != 0);
#else
 return ((type->tp_flags & feature) != 0);
#endif
}
#define _PyObject_SIZE(typeobj) ( (typeobj)->tp_basicsize )