struct reflection

[ihnorton]

Generate Julia types to match C struct declarations

• fixed-size arrays
• unions

[mlubin]

+1

[ihnorton]

This is available for simple structs (bitstypes and pointers only) if you set "WrapContext.options.wrap_structs = true". But the utility is kind of limited, because we can't pass structs by value or de-reference members in pure Julia yet.

For supported structs, the output should be usable with StrPack by adding @struct in front of the type declaration, but you would still need to do the pack/unpack steps yourself around each call. When I looked through StrPack I didn't really see a consistent way to generate wrappers to do that, because you need to know some things about how the function will actually be called... but maybe I should look in to that again.

[pao]

I'm open to patches. Of course avoiding StrPack is going to be better when possible since using it will force a copy in each direction. I'm not sure what currently works or doesn't natively, and as I believe you are aware it's not obvious from the current issues on the topic.

[ihnorton]

I should have phrased that differently, because the question of whether or not to strpack a particular pointer argument is kind of tangential to StrPack (context-specific and requires knowledge beyond just the fact that it is a pointer).

[ihnorton]

Fixed-size arrays are supported here by pre-declaring a bitstype of the appropriate size, and then using that in the right place so that the struct is at least sized and aligned correctly. The result is eg: bitstype 32*sizeof(UINT8)*16 Array_16_UINT. (I suppose custom getindex/setindex can be defined on these if needed.. obviously this will all go away as soon as the new tuple stuff is merged)

Need to do unions in a similar way by finding the largest element.

[Gnimuc]

closed in favor of #228