Message1830

Patch is added with the patch number: [1773865]

Problem:
========

PyString.java
-------------
final static PyObject str_new(PyNewWrapper new_, boolean init, PyType subtype,
            PyObject[] args, String[] keywords) {
        ArgParser ap = new ArgParser("str", args, keywords, new String[] { "object" }, 0);
        PyObject S = ap.getPyObject(0, null);
        if(new_.for_type == subtype) {
            if(S == null) {
                return new PyString("");
            }
            return S.__str__();
---
---
---
}

Here S is an arg of type PyStringDerived. When you call S.__str__(),
it is returning a string of type PyStringDerived with the contents of arg.
But this leads to making calls to __init__ of mystr class as in the 
following.

PyType.java
------------
private static PyObject invoke_new_(PyObject new_,PyType type .....{
...
        newobj.dispatch__init__(type,args,keywords);
        return newobj;
    }

Here newobj is nothing but an obj of type PyStringDerived. This causes 
the invocation of the following code.

PyStringDerived.java
---------------------
public void dispatch__init__(PyType type,PyObject[]args,String[]keywords) {
        PyType self_type=getType();
        if (self_type.isSubType(type)) {
            PyObject impl=self_type.lookup("__init__");
            <<<  call to __init__ of mystr >>>
}}

So here, the constructor is called recursively and it causes stackoverflow.

Solution:
=========

PyString.java
-------------
final static PyObject str_new(PyNewWrapper new_, boolean init, PyType subtype,
            PyObject[] args, String[] keywords) {
---
            return new PyString(S.__str__().toString()); //CHANGE
---
}