[PATCH 06/24] Reimplement "tui reg" command

[Tom Tromey <tom at tromey dot com>]

This reimplements the low-level layout function that is used by the
"tui reg" command.  Now it simply calls into the existing "layout"
command, though this will be changed again in a subsequent patch.  The
rationale for this patch is that it makes it simpler to remove
"enum tui_layout_type".

gdb/ChangeLog
2020-01-04  Tom Tromey  <tom@tromey.com>

	* tui/tui-regs.c (tui_reg_layout): Remove.
	(tui_reg_command): Use tui_regs_layout.
	* tui/tui-layout.h (tui_reg_command): Declare.
	* tui/tui-layout.c (tui_reg_command): New function.

Change-Id: I0ca6884e2967005e7d3fbf5f13a0ac8f9c3298cf
---
 gdb/ChangeLog        |  7 +++++++
 gdb/tui/tui-layout.c |  8 ++++++++
 gdb/tui/tui-layout.h |  3 +++
 gdb/tui/tui-regs.c   | 17 +----------------
 4 files changed, 19 insertions(+), 16 deletions(-)

diff --git a/gdb/tui/tui-layout.c b/gdb/tui/tui-layout.c
index 86b496d273e..68a55179d98 100644
--- a/gdb/tui/tui-layout.c
+++ b/gdb/tui/tui-layout.c
@@ -286,6 +286,14 @@ tui_next_layout ()
 
 /* See tui-layout.h.  */
 
+void
+tui_regs_layout ()
+{
+  tui_layout_command ("regs", 0);
+}
+
+/* See tui-layout.h.  */
+
 void
 tui_remove_some_windows ()
 {
diff --git a/gdb/tui/tui-layout.h b/gdb/tui/tui-layout.h
index f711b004b84..05089ab8fff 100644
--- a/gdb/tui/tui-layout.h
+++ b/gdb/tui/tui-layout.h
@@ -194,6 +194,9 @@ extern void tui_set_layout (enum tui_layout_type);
 /* Switch to the next layout.  */
 extern void tui_next_layout ();
 
+/* Show the register window.  Like "layout regs".  */
+extern void tui_regs_layout ();
+
 /* Remove some windows from the layout, leaving only the focused
    window and the command window; if no window has the focus, then
    some other window is chosen to remain.  */
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index 41b8f0d933c..ad57069968c 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -542,21 +542,6 @@ tui_reg_prev (struct reggroup *current_group, struct gdbarch *gdbarch)
   return group;
 }
 
-/* A helper function to display the register window in the appropriate
-   way.  */
-
-static void
-tui_reg_layout ()
-{
-  enum tui_layout_type cur_layout = tui_current_layout ();
-  enum tui_layout_type new_layout;
-  if (cur_layout == SRC_COMMAND || cur_layout == SRC_DATA_COMMAND)
-    new_layout = SRC_DATA_COMMAND;
-  else
-    new_layout = DISASSEM_DATA_COMMAND;
-  tui_set_layout (new_layout);
-}
-
 /* Implement the 'tui reg' command.  Changes the register group displayed
    in the tui register window.  Displays the tui register window if it is
    not already on display.  */
@@ -578,7 +563,7 @@ tui_reg_command (const char *args, int from_tty)
 	 appropriate layout.  We need to do this before trying to run the
 	 'next' or 'prev' commands.  */
       if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->is_visible ())
-	tui_reg_layout ();
+	tui_regs_layout ();
 
       struct reggroup *current_group = TUI_DATA_WIN->get_current_group ();
       if (strncmp (args, "next", len) == 0)
-- 
2.17.2