Re: [patch/rfc] Add a sentinel frame

[Andrew Cagney <ac131313@redhat.com>]

I've checked this in.

> 2003-01-23  Andrew Cagney  <ac131313@redhat.com>
> 
> 	* sentinel-frame.h, sentinel-frame.c: New files.
> 	* Makefile.in (frame.o): Update dependencies.
> 	(SFILES): Add sentinel-frame.c.
> 	(sentinel_frame_h): Define.
> 	(COMMON_OBS): Add sentinel-frame.o.
> 	(sentinel-frame.o): Specify dependencies.
> 	* frame.c: Include "sentinel-frame.h".
> 	(frame_register_unwind): Rewrite assuming that there is always a a
> 	->next frame.
> 	(frame_register, generic_unwind_get_saved_register): Ditto.
> 	(frame_read_unsigned_register, frame_read_signed_register): Ditto.
> 	(create_sentinel_frame, unwind_to_current_frame): New functions.
> 	(get_current_frame): Rewrite using create_sentinel_frame and
> 	unwind_to_current_frame.  When possible, always create a frame.
> 	(create_new_frame): Set next to the sentinel frame.
> 	(get_next_frame): Rewrite.  Don't go below the level 0 frame.
> 	(deprecated_update_frame_pc_hack): Update the next frame's PC and
> 	ID cache when necessary.
> 	(frame_saved_regs_id_unwind): Use frame_relative_level.
> 	(deprecated_generic_get_saved_register): Use frame_relative_level,
> 	get_frame_saved_regs, get_frame_pc, get_frame_base and
> 	get_next_frame.
> 	(frame_saved_regs_register_unwind): Use get_frame_saved_regs and
> 	frame_register.

now back to kevin's question.

Andrew