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Date: Fri, 10 Jan 2003 02:17:00 -0000
From: Andrew Cagney <ac131313@redhat.com>
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Subject: [unwind-20030108-branch] Add sentinel-frame + misc
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This adds sentinal-frame.[hc] and then modifies the unwind code in 
frame.c so that it can exploit the fact that there is alway an extra 
frame beyond the inner most frame.  This has a dramatic effect on the 
unwind code - so much simpler!

It doesn't do things like ensure that there is always a frame or create 
the inner most frame from the sentinel frame.

To confuse the patch slightly, it also adjusts the id_unwind, pc_unwind 
and register_unwind function types.

Andrew