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, 11 insertions, 3 deletions

diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 229c66b..63a6496 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -528,7 +528,9 @@ SFILES = ada-exp.y ada-lang.c ada-typeprint.c ada-valprint.c ada-tasks.c \
 	objfiles.c osabi.c \
 	p-exp.y p-lang.c p-typeprint.c p-valprint.c parse.c printcmd.c \
 	regcache.c reggroups.c remote.c \
-	scm-exp.c scm-lang.c scm-valprint.c serial.c ser-unix.c source.c \
+	scm-exp.c scm-lang.c scm-valprint.c \
+	sentinel-frame.c \
+	serial.c ser-unix.c source.c \
 	stabsread.c stack.c std-regs.c symfile.c symmisc.c symtab.c \
 	target.c thread.c top.c tracepoint.c typeprint.c \
 	tui/tui.c tui/tui.h tui/tuiCommand.c tui/tuiCommand.h \
@@ -686,6 +688,7 @@ remote_utils_h = remote-utils.h $(target_h)
 remote_h = remote.h
 scm_lang_h = scm-lang.h $(scm_tags_h)
 scm_tags_h = scm-tags.h
+sentinel_frame_h = sentinel-frame.h
 ser_unix_h = ser-unix.h
 serial_h = serial.h
 sh_tdep_h = sh-tdep.h
@@ -832,7 +835,9 @@ COMMON_OBS = version.o blockframe.o breakpoint.o findvar.o regcache.o \
 	varobj.o wrapper.o \
 	jv-lang.o jv-valprint.o jv-typeprint.o \
 	m2-lang.o p-lang.o p-typeprint.o p-valprint.o \
-	scm-exp.o scm-lang.o scm-valprint.o complaints.o typeprint.o \
+	scm-exp.o scm-lang.o scm-valprint.o \
+	sentinel-frame.o \
+	complaints.o typeprint.o \
 	c-typeprint.o f-typeprint.o m2-typeprint.o \
 	c-valprint.o cp-valprint.o f-valprint.o m2-valprint.o \
 	nlmread.o serial.o mdebugread.o top.o utils.o \
@@ -1692,7 +1697,8 @@ fork-child.o: fork-child.c $(defs_h) $(gdb_string_h) $(frame_h) \
 frame.o: frame.c $(defs_h) $(frame_h) $(target_h) $(value_h) $(inferior_h) \
 	$(regcache_h) $(gdb_assert_h) $(gdb_string_h) $(builtin_regs_h) \
 	$(gdb_obstack_h) $(dummy_frame_h) $(gdbcore_h) $(annotate_h) \
-	$(language_h) $(frame_unwind_h) $(command_h) $(gdbcmd_h)
+	$(language_h) $(frame_unwind_h) $(command_h) $(gdbcmd_h) \
+	$(sentinel_frame_h)
 frame-unwind.o: frame-unwind.c $(defs_h) $(frame_h) $(frame_unwind_h) \
 	$(gdb_assert_h) $(dummy_frame_h) $(legacy_frame_h)
 frv-tdep.o: frv-tdep.c $(defs_h) $(inferior_h) $(symfile_h) $(gdbcore_h) \
@@ -2125,6 +2131,8 @@ scm-lang.o: scm-lang.c $(defs_h) $(symtab_h) $(gdbtypes_h) $(expression_h) \
 scm-valprint.o: scm-valprint.c $(defs_h) $(symtab_h) $(gdbtypes_h) \
 	$(expression_h) $(parser_defs_h) $(language_h) $(value_h) \
 	$(scm_lang_h) $(valprint_h) $(gdbcore_h)
+sentinel-frame.o: sentinel-frame.c $(defs_h) $(regcache_h) \
+	$(sentinel_frame_h) $(inferior_h) $(frame_unwind_h)
 ser-e7kpc.o: ser-e7kpc.c $(defs_h) $(serial_h) $(gdb_string_h)
 ser-go32.o: ser-go32.c $(defs_h) $(gdbcmd_h) $(serial_h) $(gdb_string_h)
 ser-pipe.o: ser-pipe.c $(defs_h) $(serial_h) $(ser_unix_h) $(gdb_vfork_h) \