guile scripting for gdb

[Doug Evans]

On Sat, Nov 9, 2013 at 10:40 AM, Doug Evans <dje@sebabeach.org> wrote:
>> As discussed on IRC, one possible issue is eq?-ness of SMOBs: one would
>> usually expects pointer equality to be preserved at the Scheme level.
>
> Yeah.
> That'll require gdb maintaining its own table(s) for each kind of smob
> we want to intern.

Actually, to be more precise, it will require maintaining tables for
*some* smobs we want to intern.
For other smobs the cost of caching the SCM in the gdb object isn't onerous.
[The object is marked as protected from GC until the gdb object is deleted.]

Alas, for two of the more important smobs we'd want to eq?, I think,
gdb symbols and types, we'll need separate tables.
Minimizing space usage of their gdb structs is important (critical
even), and only a small fraction of them will typically be used in
Scheme.
And we certainly don't want to pay that expense when Scheme isn't used.