Function _PyArray_DescrHashImp

numpy/core/src/multiarray/hashdescr.c:260–297

* Return 0 if successful */

 * Return 0 if successful
 */
static int _PyArray_DescrHashImp(PyArray_Descr *descr, npy_hash_t *hash)
{
    PyObject *l, *tl;
    int st;

    l = PyList_New(0);
    if (l == NULL) {
        return -1;
    }

    st = _array_descr_walk(descr, l);
    if (st) {
        Py_DECREF(l);
        return -1;
    }

    /*
     * Convert the list to tuple and compute the tuple hash using python
     * builtin function
     */
    tl = PyList_AsTuple(l);
    Py_DECREF(l);
    if (tl == NULL)
        return -1;

    *hash = PyObject_Hash(tl);
    Py_DECREF(tl);
    if (*hash == -1) {
        /* XXX: does PyObject_Hash set an exception on failure ? */
#if 0
        PyErr_SetString(PyExc_SystemError,
                "(Hash) Error while hashing final tuple");
#endif
        return -1;
    }

    return 0;
}

NPY_NO_EXPORT npy_hash_t
PyArray_DescrHash(PyObject* odescr)