private static IntPtr GetOrAllocateThunk(Delegate del)
{
ConditionalWeakTable <Delegate, PInvokeDelegateThunk> pinvokeDelegates = GetPInvokeDelegates();
PInvokeDelegateThunk delegateThunk;
// if the delegate already exists in the table return the allocated thunk for it
if (pinvokeDelegates.TryGetValue(del, out delegateThunk))
{
return(delegateThunk.Thunk);
}
if (s_thunkPoolHeap == null)
{
s_thunkPoolHeap = RuntimeAugments.CreateThunksHeap(RuntimeImports.GetInteropCommonStubAddress());
Debug.Assert(s_thunkPoolHeap != null);
}
delegateThunk = new PInvokeDelegateThunk(del);
McgPInvokeDelegateData pinvokeDelegateData;
if (!RuntimeAugments.InteropCallbacks.TryGetMarshallerDataForDelegate(del.GetTypeHandle(), out pinvokeDelegateData))
{
Environment.FailFast("Couldn't find marshalling stubs for delegate.");
}
//
// For open static delegates set target to ReverseOpenStaticDelegateStub which calls the static function pointer directly
//
IntPtr pTarget = del.GetRawFunctionPointerForOpenStaticDelegate() == IntPtr.Zero ? pinvokeDelegateData.ReverseStub : pinvokeDelegateData.ReverseOpenStaticDelegateStub;
RuntimeAugments.SetThunkData(s_thunkPoolHeap, delegateThunk.Thunk, delegateThunk.ContextData, pTarget);
// Add the delegate to the dictionary if it doesn't already exists
delegateThunk = pinvokeDelegates.GetOrAdd(del, delegateThunk);
return(delegateThunk.Thunk);
}
