frame cache

[Michael Eager <eager@eagercon.com>]

I have a couple questions about the <target>_frame_cache
structure and functions.

1)  This appears to be a single-entry cache.  Why not keep
     multiple entries?

2)  The data in the frame cache seems to be of two different
     types:
     a)  Fixed, based on analyzing the code: register offsets,
         stack alignment, framelessness, etc.
     b)  Variable, based on the call: return pc, frame base

     It looks to me that the object code is analyzed repeatedly
     and this fixed information is discarded along with the
     variable information.

     Why not keep a persistent cache of function specific fixed
     data and only discard the call-specific data when the frame
     cache is cleared?

Is there any documentation about what target-specific data
the frame cache is supposed to contain or how the functions are
supposed to work?


-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077