[Help-smalltalk] CStruct ABI and packed structs

[Holger Hans Peter Freyther]

Hi again,

I had some time to browse through the CStruct code and I think it is
really nice. There are two issues for my intended usecase and I wanted
to ask what to do about it.

1.) The alignment rules of the type are inside the type itself, but in
general this is coming from the ABI. E.g. one case (it might not apply
to smalltalk) is that 64 bit types have a 8 byte alignment on ARM EABI
and 4 byte on the old ABI...

2.) The structs I showed are all packed and should not follow the
alignment rules...


I would like to move the alignof out of the type classes and into an ABI
class and at first step contain the alignment rules we have right now,
the second thing would be to create a CPackedStruct subclass which will
ignore the alignment rules. I would change the CStruct to make
subclassing more easy.

does this make sense?
        z.