Re: [Pnet-developers] Use of ILNativeUInt vs. unsigned long in pointer casting and manipulation

[Peter Colson]

On 23/09/2004, at 7:57 AM, Rhys Weatherley wrote:

> On Wednesday 22 September 2004 03:35 pm, Peter Colson wrote:
>
> > In include/il_types.h, though, the various IL_TypeFrom/To macros use
> > unsigned long as the intermediate type. This resolves to a 4 byte
> > entity in my environment, so an obvious problem here.
>
> Probably a bug that we haven't noticed till now.  Easy to fix.

Yep. Fixed it here too.

> > When I look through the code I see other instances of, say,
> > ILType_FromElement being used on a 'value' var that is returned as an
> > unsigned long from ILMetaUncompressData().
>
> ILType_FromElement takes an integer value and converts it into a 
> pointer.  It
> doesn't really matter what integer type is used as long as it is at 
> least
> 32-bits.  This one is probably the more correct of those macros.  An 
> explicit
> cast to ILNativeUInt may be warranted to get around dingbat compilers.

OK. I just want to understand how the resultant pointer can be used as a
real 'type' pointer in an environment that uses 8 byte pointers, if 
it's sourced
from a 32 bit integral?


Regards,
Peter Colson.