2003-01-21 Andrew Cagney <ac131313@redhat.com>

2003-01-21  Andrew Cagney  <ac131313@redhat.com>

	* frame.h (FRAME_OBSTACK_ZALLOC): Define.
	* blockframe.c (backtrace_below_main): Move to "frame.c".
	(frame_chain_valid): Delete check for backtrace_below_main.
	(_initialize_blockframe): Delete initialization, move ``set
	backtrace-below-main'' command to "frame.c".
	(do_flush_frames_sfunc): Delete function.
	* frame.c: Include "command.h" and "gdbcmd.h".
	(frame_type_from_pc): New function.
	(create_new_frame): Use frame_type_from_pc.
	(legacy_get_prev_frame): New function.
	(get_prev_frame): Rewrite.  When an old style frame, call
	legacy_get_prev_frame.  Otherwize, unwind the PC first.
	(_initialize_frame): Add ``set backtrace-below-main'' command.
	* Makefile.in (frame.o): Update dependencies.