frame cache

Michael Eager
2007-07-24T17:01:18Z

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