[pypy-dev] PyArray_Type cpyext bug

[Antonio Cuni]

Hi,

I committed a cpyext+numpy failing test in a3c3b75a7f2b.
In short, the following fails:

     if (!PyArg_ParseTuple(args, "O!", &PyArray_Type, &obj))
         return NULL;

The problem is that PyArray_Type is currently defined in ndarrayobject.c but 
never initialized:

     PyTypeObject PyArray_Type;

not a suprise that we get a segfault when we try to use it.

However, I'm not sure about what is the best way to fix it, so I ask the 
cpyext wizards :)

I think that at the end what we want is an object for which &PyArray_Type is 
equal to the PyObject* that we get when we pass _numpypy.multiarray.ndarray to C.

One possibility is to run the following code in some initialization function:

     static PyObject* _PyArray_Type;
     #define PyArray_Type (*_PyArray_Type)

     PyObject* np = PyImport_ImportModule("numpy");
     if (!np)
         return;

     _PyArray_Type = PyObject_GetAttrString(np, "ndarray");
     if (!My_PyArray_Type)
         return;


I'm sure there is a better way to do this. However, I tried to play with the 
cpyext source for a while and didn't manage to find it. Any suggestion?

ciao,
Anto