Function _array_descr_builtin

numpy/core/src/multiarray/hashdescr.c:71–100

* Add to l all the items which uniquely define a builtin type */

 * Add to l all the items which uniquely define a builtin type
 */
static int _array_descr_builtin(PyArray_Descr* descr, PyObject *l)
{
    Py_ssize_t i;
    PyObject *t, *item;
    char nbyteorder = _normalize_byteorder(descr->byteorder);

    /*
     * For builtin type, hash relies on : kind + byteorder + flags +
     * type_num + elsize + alignment
     */
    t = Py_BuildValue("(cccii)", descr->kind, nbyteorder,
            descr->flags, descr->elsize, descr->alignment);

    for(i = 0; i < PyTuple_Size(t); ++i) {
        item = PyTuple_GetItem(t, i);
        if (item == NULL) {
            PyErr_SetString(PyExc_SystemError,
                    "(Hash) Error while computing builtin hash");
            goto clean_t;
        }
        PyList_Append(l, item);
    }

    Py_DECREF(t);
    return 0;

clean_t:
    Py_DECREF(t);
    return -1;
}

/*
 * Walk inside the fields and add every item which will be used for hashing