Re: [Sbcl-devel] store-value and reevaluate-symbol restarts for unbound-variable errors

[Alastair B. <nye...@li...>]

Alastair Bridgewater writes: 

> Hello all,  
> 
> Attached is a patch to add store-value and reevaluate-symbol restarts for 
> unbound-variable errors. This is x86-only functionality for now, but 
> shouldn't be too hard to add to other platforms. It adds two or five bytes 
> of overhead to each compiled symbol-value access (depending on the length 
> of the compiled function). This patch was created from 0.9.8.38, but 
> should work on any recentish version.  
> 
> --Alastair Bridgewater 

And, again, I can't leave well enough alone. This patch is slightly more 
expensive in terms of overhead on symbol-value access (three instructions 
instead of one), but also contains a use-value restart. 

This version does some damage to the internal-error handler definition 
machinery in src/code/interr.lisp. I tried to keep the damage to a minimum, 
but the functionality I needed wasn't quite easy to produce. 

Anyway, feedback would be welcome. 

 --Alastair Bridgewater