2003-01-27 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.

1 files changed, 41 insertions, 0 deletions

diff --git a/gdb/sentinel-frame.h b/gdb/sentinel-frame.h
new file mode 100644
index 00000000000..9b69f42154b
--- /dev/null
+++ b/gdb/sentinel-frame.h
@@ -0,0 +1,41 @@
+/* Code dealing with register stack frames, for GDB, the GNU debugger.
+
+   Copyright 2003 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#if !defined (SENTINEL_FRAME_H)
+#define SENTINEL_FRAME_H 1
+
+struct frame_unwind;
+struct regcache;
+
+/* Implement the sentinel frame.  The sentinel frame terminates the
+   inner most end of the frame chain.  If unwound, it returns the
+   information need to construct an inner-most frame.  */
+
+/* Pump prime the sentinel frame's cache.  Since this needs the
+   REGCACHE provide that here.  */
+
+extern void *sentinel_frame_cache (struct regcache *regcache);
+
+/* At present there is only one type of sentinel frame.  */
+
+extern const struct frame_unwind *const sentinel_frame_unwind;
+
+#endif /* !defined (SENTINEL_FRAME_H)  */