[patch][python] Implement Python lazy strings (PR 10705)

[Tom Tromey]

>>>>> "Phil" == Phil Muldoon <pmuldoon@redhat.com> writes:

Phil> Here is an updated patch. What do you think?

A couple more notes.

Phil> +gdbpy_extract_lazy_string (PyObject *string, struct type **str_type,
Phil> +		     long *length, char **encoding)
Phil> +{
[...]
Phil> +  py_len = PyObject_GetAttrString (string, "length");
Phil> +  py_encoding = PyObject_GetAttrString (string, "encoding");
Phil> +  py_addr = PyObject_GetAttrString (string, "address");
Phil> +  py_type = PyObject_GetAttrString (string, "type");
[...]
Phil> +  Py_DECREF (py_len);
Phil> +  Py_XDECREF (py_encoding);

Nothing ever frees py_addr or py_type.
This is true for the error case as well.

Phil> +PyObject *execute_pretty_printer (PyObject *printer);

This is declared but never defined or used.

Tom