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);
}
static void InitializeSlot(IntPtr type, int slotOffset, MethodInfo method, SlotsHolder slotsHolder = null)
{
var thunk = Interop.GetThunk(method);
Marshal.WriteIntPtr(type, slotOffset, thunk.Address);
if (slotsHolder != null)
{
slotsHolder.Set(slotOffset, thunk);
}
}
static void InitializeSlot(IntPtr type, ThunkInfo thunk, string name, SlotsHolder slotsHolder = null, bool canOverride = true)
{
int offset = ManagedDataOffsets.GetSlotOffset(name);
if (!canOverride && Marshal.ReadIntPtr(type, offset) != IntPtr.Zero)
{
return;
}
Marshal.WriteIntPtr(type, offset, thunk.Address);
if (slotsHolder != null)
{
slotsHolder.Set(offset, thunk);
}
}
static void InitializeSlot(IntPtr type, ThunkInfo thunk, string name, SlotsHolder slotsHolder = null, bool canOverride = true)
{
Type typeOffset = typeof(TypeOffset);
FieldInfo fi = typeOffset.GetField(name);
var offset = (int)fi.GetValue(typeOffset);
if (!canOverride && Marshal.ReadIntPtr(type, offset) != IntPtr.Zero)
{
return;
}
Marshal.WriteIntPtr(type, offset, thunk.Address);
if (slotsHolder != null)
{
slotsHolder.Set(offset, thunk);
}
}
