``struct location''

[Andrew Cagney <ac131313@ges.redhat.com>]

Hello,

This is a hunch.

I think there should be a ``struct location'' object to go with the 
``struct type'' object.  The ``struct value'' object would then be made 
of, the TYPE, LOCATION and, once the value has been read from memory, 
its VALUE.

This would make it possible for location expression evaluators and 
similar (e.g., unwind functions describing register locations) to return 
a ``location'' without any need to refer to types.

Having the location as an abstraction would also make it possible for 
GDB's ``location'' code to evolve independantly of the ``struct value'' 
- this is something we know we need since at present GDB can't describe 
things like values with a location that spreads across multiple 
registers and memory.

thoughts?
Andrew