Function encoder_annotate_exception

simplejson/_speedups.c:3205–3242

Attach a PEP 678 note formatted via PyUnicode_FromFormatV to the in- * flight exception. Mirrors the pure-Python encoder's * `except BaseException as exc: exc.add_note(...); raise` wrappers * around each recursive encode step. * * Crucially, PyErr_Fetch runs BEFORE the note is built: the `%R` * formatter walks into PyObject_Repr, which on debug builds * (cpython-3.14-debug and cpython-3.14t

 *
 * Only compiled on Python 3.11+, where PEP 678 exists. */
static void
encoder_annotate_exception(_speedups_state *state, const char *format, ...)
{
    PyObject *exc_type;
    PyObject *exc_value;
    PyObject *exc_tb;
    PyObject *note;
    PyObject *result;
    va_list args;

    PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
    if (exc_value == NULL) {
        /* No live exception to annotate — callsites always have one,
         * so this is a defensive no-op. */
        PyErr_Restore(exc_type, exc_value, exc_tb);
        return;
    }
    PyErr_NormalizeException(&exc_type, &exc_value, &exc_tb);

    va_start(args, format);
    note = PyUnicode_FromFormatV(format, args);
    va_end(args);

    if (note != NULL) {
        result = PyObject_CallMethodObjArgs(exc_value, state->JSON_attr_add_note,
                                            note, NULL);
        Py_DECREF(note);
        if (result == NULL)
            PyErr_Clear();
        else
            Py_DECREF(result);
    }
    else {
        PyErr_Clear();
    }

    PyErr_Restore(exc_type, exc_value, exc_tb);
}
#endif

static int