internal static bool TryFreeGCHandle(BorrowedReference reflectedClrObject, BorrowedReference type)
{
Debug.Assert(type != null);
Debug.Assert(reflectedClrObject != null);
Debug.Assert(IsManagedType(type) || IsManagedType(reflectedClrObject));
Debug.Assert(Runtime.PyObject_TypeCheck(reflectedClrObject, type));
int offset = Util.ReadInt32(type, Offsets.tp_clr_inst_offset);
Debug.Assert(offset > 0);
IntPtr raw = Util.ReadIntPtr(reflectedClrObject, offset);
if (raw == IntPtr.Zero)
{
return(false);
}
var handle = (GCHandle)raw;
handle.Free();
Util.WriteIntPtr(reflectedClrObject, offset, IntPtr.Zero);
return(true);
}
/// <summary>
/// For the operator methods of a CLR type, set the special slots of the
/// corresponding Python type's operator methods.
/// </summary>
public static void FixupSlots(BorrowedReference pyType, Type clrType)
{
Debug.Assert(_opType != null);
var operatorCandidates = GetOperatorCandidates(clrType);
foreach (var method in operatorCandidates)
{
// We only want to override slots for operators excluding
// comparison operators, which are handled by ClassBase.tp_richcompare.
if (!OpMethodMap.ContainsKey(method.Name))
{
continue;
}
int offset = OpMethodMap[method.Name].TypeOffset;
// Copy the default implementation of e.g. the nb_add slot,
// which simply calls __add__ on the type.
IntPtr func = Util.ReadIntPtr(_opType !, offset);
// Write the slot definition of the target Python type, so
// that we can later modify __add___ and it will be called
// when used with a Python operator.
// https://tenthousandmeters.com/blog/python-behind-the-scenes-6-how-python-object-system-works/
Util.WriteIntPtr(pyType, offset, func);
}
}
internal static void SetGCHandle(BorrowedReference reflectedClrObject, BorrowedReference type, GCHandle newHandle)
{
Debug.Assert(type != null);
Debug.Assert(reflectedClrObject != null);
Debug.Assert(IsManagedType(type) || IsManagedType(reflectedClrObject));
Debug.Assert(Runtime.PyObject_TypeCheck(reflectedClrObject, type));
int offset = Util.ReadInt32(type, Offsets.tp_clr_inst_offset);
Debug.Assert(offset > 0);
Util.WriteIntPtr(reflectedClrObject, offset, (IntPtr)newHandle);
}
