Ada, treelang needs to be converted to --enable-mapped-location

[Robert Dewar]

Richard Kenner wrote:

> (2) If we do it in Gigi, the issue is that the line-map code expects to see
> locations created in increasing order, but there's no guarantee that the
> nodes will be processed in that order.

Note that even the initial creation of source locations in the GNAT
front end does not meet the requirement of creating locations in
increasing order, because of scan backup.


> My proposal is basically to take the view that source_location is an unsigned
> int that's an opaque datatype used to encode a (file, line column) triple.
> This datatype can either be defined in the front end (in which case it
> provides a language hook to produce that triple from the encoding) or it can
> use routines provided in line-map.c to generate the encoding.

That really seems easier to me, given especially that the concept
of locations is language dependent wrt things like generic instantiation.