public IntPtr ContextData; // ThunkContextData pointer which will be stored in the context slot of the thunk
public PInvokeDelegateThunk(Delegate del)
{
Thunk = RuntimeAugments.AllocateThunk(s_thunkPoolHeap);
Debug.Assert(Thunk != IntPtr.Zero);
if (Thunk == IntPtr.Zero)
{
// We've either run out of memory, or failed to allocate a new thunk due to some other bug. Now we should fail fast
Environment.FailFast("Insufficient number of thunks.");
}
else
{
//
// Allocate unmanaged memory for GCHandle of delegate and function pointer of open static delegate
// We will store this pointer on the context slot of thunk data
//
unsafe
{
ContextData = (IntPtr)NativeMemory.Alloc((nuint)(2 * IntPtr.Size));
ThunkContextData *thunkData = (ThunkContextData *)ContextData;
// allocate a weak GChandle for the delegate
thunkData->Handle = GCHandle.Alloc(del, GCHandleType.Weak);
// if it is an open static delegate get the function pointer
thunkData->FunctionPtr = del.GetRawFunctionPointerForOpenStaticDelegate();
}
}
}
public static unsafe IntPtr AllocHGlobal(IntPtr cb)
{
return((nint)NativeMemory.Alloc((nuint)(nint)cb));
}