public MethodWrapper(Type type, string name)
{
// Turn the managed method into a function pointer
IntPtr fp = Interop.GetThunk(type.GetMethod(name));
// XXX - here we create a Python string object, then take the
// char * of the internal string to pass to our methoddef
// structure. Its a hack, and the name is leaked!
#if (PYTHON32 || PYTHON33 || PYTHON34)
IntPtr ps = Runtime.PyBytes_FromString(name);
IntPtr sp = Runtime.PyBytes_AS_STRING(ps);
#else
IntPtr ps = Runtime.PyString_FromString(name);
IntPtr sp = Runtime.PyString_AS_STRING(ps);
#endif
// Allocate and initialize a PyMethodDef structure to represent
// the managed method, then create a PyCFunction.
mdef = Runtime.PyMem_Malloc(4 * IntPtr.Size);
Marshal.WriteIntPtr(mdef, sp);
Marshal.WriteIntPtr(mdef, (1 * IntPtr.Size), fp);
Marshal.WriteIntPtr(mdef, (2 * IntPtr.Size), (IntPtr)0x0003); // METH_VARARGS | METH_KEYWORDS
Marshal.WriteIntPtr(mdef, (3 * IntPtr.Size), IntPtr.Zero);
ptr = Runtime.PyCFunction_New(mdef, IntPtr.Zero);
}
//====================================================================
// Utility method to allocate a type object & do basic initialization.
//====================================================================
internal static IntPtr AllocateTypeObject(string name)
{
IntPtr type = Runtime.PyType_GenericAlloc(Runtime.PyTypeType, 0);
// Cheat a little: we'll set tp_name to the internal char * of
// the Python version of the type name - otherwise we'd have to
// allocate the tp_name and would have no way to free it.
#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)
// For python3 we leak two objects. One for the ascii representation
// required for tp_name, and another for the unicode representation
// for ht_name.
IntPtr temp = Runtime.PyBytes_FromString(name);
IntPtr raw = Runtime.PyBytes_AS_STRING(temp);
temp = Runtime.PyUnicode_FromString(name);
#else
IntPtr temp = Runtime.PyString_FromString(name);
IntPtr raw = Runtime.PyString_AS_STRING(temp);
#endif
Marshal.WriteIntPtr(type, TypeOffset.tp_name, raw);
Marshal.WriteIntPtr(type, TypeOffset.name, temp);
#if (PYTHON33 || PYTHON34 || PYTHON35)
Marshal.WriteIntPtr(type, TypeOffset.qualname, temp);
#endif
long ptr = type.ToInt64(); // 64-bit safe
temp = new IntPtr(ptr + TypeOffset.nb_add);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_number, temp);
temp = new IntPtr(ptr + TypeOffset.sq_length);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_sequence, temp);
temp = new IntPtr(ptr + TypeOffset.mp_length);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_mapping, temp);
#if (PYTHON32 || PYTHON33 || PYTHON34 || PYTHON35)
temp = new IntPtr(ptr + TypeOffset.bf_getbuffer);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_buffer, temp);
#else
temp = new IntPtr(ptr + TypeOffset.bf_getreadbuffer);
Marshal.WriteIntPtr(type, TypeOffset.tp_as_buffer, temp);
#endif
return(type);
}