Opencl datahandling

Since the target_dh_refactoring was never merged, we decided to do the refactoring at smaller steps and recover the original OpenCL datahandling PR.

Refactoring to merge target and backend can be done later.

pystencils/opencl/opencljit.py

@@ -117,6 +117,10 @@ def make_python_function(kernel_function_node, opencl_queue, opencl_ctx, argumen
         except KeyError:
             full_arguments = argument_dict.copy()
             full_arguments.update(kwargs)
+            assert not any(isinstance(a, np.ndarray)
+                           for a in full_arguments.values()), 'Calling a OpenCL kernel with a Numpy array!'
+            assert not any('pycuda' in str(type(a))
+                           for a in full_arguments.values()), 'Calling a OpenCL kernel with a PyCUDA array!'
             shape = _check_arguments(parameters, full_arguments)
 
             indexing = kernel_function_node.indexing