The motivation for this huge patch is to allow the register window to properly 
handle display and editing of SIMD registers.  This caused me to have to 
rewrite numerous functions and while I was doing that I fixed a bunch of 
things that were either broken, slow or really annoying.

-- 
Martin Hunt
GDB Engineer
Red Hat, Inc.

2002-05-15  Martin M. Hunt  <hunt@redhat.com>

	* library/help/register.html: Rewrite docs.
	
	* library/regwin.ith (_types): New private variable array to save
	the possible types for each register.
	(_type): New private variable array to save the selected type for 
	each register.
	(_rows): New private variable. Number of rows in the table.
	(_cols): New private variable. Number of cols in the table.
	(_load_prefs): New private method.
	(_open_memory): New private method.
	(_edit_menu): Deleted:
	(_select): Deleted.
	(_change_format): Add optional type argument.
	
	* library/regwin.itb (RegWin::_load_prefs): New method. Collects
	all the prefs stuff here instead of in _layout_table. Prefs
	code was all rewritten to handle new types and formats.
	(RegWin::_build_win): Disable Double-1 binding. Bind
	button 1 to edit the cell. Don't make an Edit menu item.
	Remove Natural, Binary, Octal, and Raw formats. Add "Open
	Memory Window" menu item. 
	(RegWin::_dimensions): This function was being abused so I removed 
	it. Replaced with inline code in _layout_table which saves its
	computed values so it doesn't have to be recalculated unless 
	something changes.
	(RegWin::_layout_table): Rewritten to be more efficient. Grabs
	all values in one call to gdb_reginfo instead of one for each register.
	Uses new types and formats.  Calls _load_prefs.
	(RegWin::_accept_edit): Use type information when setting value.
	When done, call _unedit to remove tags.
	(RegWin::_open_memory): Open memory window with initial value
	set to the value of a register.	
	(RegWin::_but3): Add types menu items. Limit format options
	to reasonable ones. Add "Open Memory Window". Add "Help" 
	(RegWin::_edit): Just call _select_cell.
	(RegWin::_edit_menu): Deleted.
	(RegWin::_move): Don't recompute rows and cols; use _rows and
	_cols computed by _layout_table.
	(RegWin::_post_menu): Update types and formats. Disable "Open Memory
	Window" if register is not integer. Remove Edit.
	(RegWin::_select): Deleted.
	(RegWin::_select_cell):	Tag cell as being edited. Then
	call focus, which is a workaround for a TkTable glitch where
	the insertion bar sometimes disappeared.
	(RegWin::_unedit): Clear selection. Call focus. Don't change
	any bindings.
	(RegWin::_get_value): Eliminate previous crap and just call 
	"gdb_reginfo value".
	(RegWin::_change_format): Add optional type arg.  Call 
	"gdb_reginfo format".
	(RegWin::_update): Get a list of all the changed registers
	instead of checking one at a time.

	* generic/gdbtk-register.c (Gdbtk_Register_Init): Don't
	create gdb_pc_reg.  It is not used. Call register_gdbarch_swap 
	with regformat and regtype.
	(gdb_register_info): Add "type" and "format" options.
	(get_pc_register): Delete.
	(get_register_types): New function.  Returns list of valid types 
	for a list of registers.
	(get_register): Use saved format and type for each register. Check if
	there are any registers yet (target not running). Use mem_file 
	to collect output. Append output to a list.
	(map_arg_registers): If passed a list, iterate though each element
	and build a list of values to return.
	(setup_architecture_data): Memory was not being initialized, so
	use xcalloc(). Allocate memory for regformat and regtype.
	(gdb_regformat): New function called by "gdb_reginfo format".