internal static SlotsHolder SetupMetaSlots(Type impl, IntPtr type)
{
// Override type slots with those of the managed implementation.
SlotsHolder slotsHolder = new SlotsHolder(type);
InitializeSlots(type, impl, slotsHolder);
// We need space for 3 PyMethodDef structs.
int mdefSize = (MetaType.CustomMethods.Length + 1) * Marshal.SizeOf(typeof(PyMethodDef));
IntPtr mdef = Runtime.PyMem_Malloc(mdefSize);
IntPtr mdefStart = mdef;
foreach (var methodName in MetaType.CustomMethods)
{
mdef = AddCustomMetaMethod(methodName, type, mdef, slotsHolder);
}
mdef = WriteMethodDefSentinel(mdef);
Debug.Assert((long)(mdefStart + mdefSize) <= (long)mdef);
Marshal.WriteIntPtr(type, TypeOffset.tp_methods, mdefStart);
// XXX: Hard code with mode check.
if (Runtime.ShutdownMode != ShutdownMode.Reload)
{
slotsHolder.Set(TypeOffset.tp_methods, (t, offset) =>
{
var p = Marshal.ReadIntPtr(t, offset);
Runtime.PyMem_Free(p);
Marshal.WriteIntPtr(t, offset, IntPtr.Zero);
});
}
return(slotsHolder);
}
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);
}
public MethodWrapper(Type type, string name, string funcType = null)
{
// Turn the managed method into a function pointer
IntPtr fp = Interop.GetThunk(type.GetMethod(name), funcType);
// Allocate and initialize a PyMethodDef structure to represent
// the managed method, then create a PyCFunction.
mdef = Runtime.PyMem_Malloc(4 * IntPtr.Size);
TypeManager.WriteMethodDef(mdef, name, fp, 0x0003);
ptr = Runtime.PyCFunction_NewEx(mdef, IntPtr.Zero, IntPtr.Zero);
}
internal static IntPtr CreateMetaType(Type impl)
{
// The managed metatype is functionally little different than the
// standard Python metatype (PyType_Type). It overrides certain of
// the standard type slots, and has to subclass PyType_Type for
// certain functions in the C runtime to work correctly with it.
IntPtr type = AllocateTypeObject("CLR Metatype");
IntPtr py_type = Runtime.PyTypeType;
Marshal.WriteIntPtr(type, TypeOffset.tp_base, py_type);
Runtime.XIncref(py_type);
// Copy gc and other type slots from the base Python metatype.
CopySlot(py_type, type, TypeOffset.tp_basicsize);
CopySlot(py_type, type, TypeOffset.tp_itemsize);
CopySlot(py_type, type, TypeOffset.tp_dictoffset);
CopySlot(py_type, type, TypeOffset.tp_weaklistoffset);
CopySlot(py_type, type, TypeOffset.tp_traverse);
CopySlot(py_type, type, TypeOffset.tp_clear);
CopySlot(py_type, type, TypeOffset.tp_is_gc);
// Override type slots with those of the managed implementation.
InitializeSlots(type, impl);
int flags = TypeFlags.Default;
flags |= TypeFlags.Managed;
flags |= TypeFlags.HeapType;
flags |= TypeFlags.HaveGC;
Util.WriteCLong(type, TypeOffset.tp_flags, flags);
// We need space for 3 PyMethodDef structs, each of them
// 4 int-ptrs in size.
IntPtr mdef = Runtime.PyMem_Malloc(3 * 4 * IntPtr.Size);
IntPtr mdefStart = mdef;
mdef = WriteMethodDef(
mdef,
"__instancecheck__",
Interop.GetThunk(typeof(MetaType).GetMethod("__instancecheck__"), "BinaryFunc")
);
mdef = WriteMethodDef(
mdef,
"__subclasscheck__",
Interop.GetThunk(typeof(MetaType).GetMethod("__subclasscheck__"), "BinaryFunc")
);
// FIXME: mdef is not used
mdef = WriteMethodDefSentinel(mdef);
Marshal.WriteIntPtr(type, TypeOffset.tp_methods, mdefStart);
Runtime.PyType_Ready(type);
IntPtr dict = Marshal.ReadIntPtr(type, TypeOffset.tp_dict);
IntPtr mod = Runtime.PyString_FromString("CLR");
Runtime.PyDict_SetItemString(dict, "__module__", mod);
//DebugUtil.DumpType(type);
return(type);
}
