[PATCH v5] Add Guile frame filter interface

[Andy Wingo]

Thanks for the feedback, Eli.  Updated patch to come will fix nits.  One
comment:

On Thu 09 Apr 2015 18:49, Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andy Wingo <wingo@igalia.com>
>> Cc: dje@google.com
>> Date: Thu, 09 Apr 2015 18:27:42 +0200
>> 
>> +frame @var{dec}.  Each item of the list should either be a
>> +@value{GDBN} symbol (@pxref{Symbols In Guile}), a pair of a
>> +@value{GDBN} symbol and a @value{GDBN} value (@pxref{Values From
>> +Inferior In Guile}, or a pair of a string and a @value{GDBN} value.
>> +In the first case, the value will be loaded from the frame if needed.
>
> I'm confused: the first case is when the item is a symbol, so what
> value is being alluded to here?

I replaced the last sentence with:

  In the first case, the @value{GDBN} symbol will be used to load the
  corresponding value from the frame if needed.

Andy