Remove separate visibility flag

TUI windows keep track of their visibility in a boolean field.
However, this is not needed, because a window is visible if and only
if it has an underlying curses handle.  So, we can remove this
separate field.

gdb/ChangeLog
2019-08-16  Tom Tromey  <tom@tromey.com>

	* tui/tui.c (tui_is_window_visible): Update.
	* tui/tui-wingeneral.c (tui_make_window)
	(tui_gen_win_info::make_visible, tui_refresh_all): Update.
	* tui/tui-win.c (window_name_completer, tui_refresh_all_win)
	(tui_set_focus_command, tui_all_windows_info, update_tab_width)
	(tui_set_win_height_command, parse_scrolling_args): Update.
	* tui/tui-source.c (tui_source_window::style_changed): Update.
	* tui/tui-regs.c (tui_show_registers)
	(tui_data_window::first_data_item_displayed)
	(tui_data_window::delete_data_content_windows)
	(tui_check_register_values, tui_reg_command): Update.
	* tui/tui-disasm.c (tui_show_disassem): Update.
	* tui/tui-data.h (struct tui_gen_win_info) <is_visible>: New
	method.
	<is_visible>: Remove field.
	* tui/tui-data.c (tui_next_win, tui_prev_win)
	(tui_delete_invisible_windows): Update.

gdb/ChangeLog

@@ -1,3 +1,23 @@
+2019-08-16  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui.c (tui_is_window_visible): Update.
+	* tui/tui-wingeneral.c (tui_make_window)
+	(tui_gen_win_info::make_visible, tui_refresh_all): Update.
+	* tui/tui-win.c (window_name_completer, tui_refresh_all_win)
+	(tui_set_focus_command, tui_all_windows_info, update_tab_width)
+	(tui_set_win_height_command, parse_scrolling_args): Update.
+	* tui/tui-source.c (tui_source_window::style_changed): Update.
+	* tui/tui-regs.c (tui_show_registers)
+	(tui_data_window::first_data_item_displayed)
+	(tui_data_window::delete_data_content_windows)
+	(tui_check_register_values, tui_reg_command): Update.
+	* tui/tui-disasm.c (tui_show_disassem): Update.
+	* tui/tui-data.h (struct tui_gen_win_info) <is_visible>: New
+	method.
+	<is_visible>: Remove field.
+	* tui/tui-data.c (tui_next_win, tui_prev_win)
+	(tui_delete_invisible_windows): Update.
+
 2019-08-16  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-winsource.h (struct tui_source_window_base)

gdb/tui/tui-data.c

@@ -148,7 +148,7 @@ tui_next_win (struct tui_win_info *cur_win)
   while (type != cur_win->type && (next_win == NULL))
     {
       if (tui_win_list[type]
-	  && tui_win_list[type]->is_visible)
+	  && tui_win_list[type]->is_visible ())
 	next_win = tui_win_list[type];
       else
 	{
@@ -178,7 +178,7 @@ tui_prev_win (struct tui_win_info *cur_win)
   while (type != cur_win->type && (prev == NULL))
     {
       if (tui_win_list[type]
-	  && tui_win_list[type]->is_visible)
+	  && tui_win_list[type]->is_visible ())
 	prev = tui_win_list[type];
       else
 	{
@@ -220,7 +220,7 @@ tui_delete_invisible_windows ()
   for (int win_type = SRC_WIN; (win_type < MAX_MAJOR_WINDOWS); win_type++)
     {
       if (tui_win_list[win_type] != NULL
-	  && !tui_win_list[win_type]->is_visible)
+	  && !tui_win_list[win_type]->is_visible ())
 	{
 	  /* This should always be made visible before a call to this
 	     function.  */

gdb/tui/tui-data.h

@@ -79,6 +79,12 @@ public:
     return false;
   }
 
+  /* Return true if this window is visible.  */
+  bool is_visible () const
+  {
+    return handle != nullptr;
+  }
+
   /* Window handle.  */
   WINDOW *handle = nullptr;
   /* Type of window.  */
@@ -91,8 +97,6 @@ public:
   struct tui_point origin = {0, 0};
   /* Viewport height.  */
   int viewport_height = 0;
-  /* Whether the window is visible or not.  */
-  bool is_visible = false;
   /* Window title to display.  */
   char *title = nullptr;
 };

gdb/tui/tui-disasm.c

@@ -253,7 +253,7 @@ tui_show_disassem (struct gdbarch *gdbarch, CORE_ADDR start_addr)
   struct tui_win_info *win_with_focus = tui_win_with_focus ();
   struct tui_line_or_address val;
 
-  gdb_assert (TUI_DISASM_WIN != nullptr && TUI_DISASM_WIN->is_visible);
+  gdb_assert (TUI_DISASM_WIN != nullptr && TUI_DISASM_WIN->is_visible ());
 
   val.loa = LOA_ADDRESS;
   val.u.addr = start_addr;

gdb/tui/tui-regs.c

@@ -138,7 +138,7 @@ tui_show_registers (struct reggroup *group)
 
   /* Make sure the register window is visible.  If not, select an
      appropriate layout.  */
-  if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->is_visible)
+  if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->is_visible ())
     tui_reg_layout ();
 
   if (group == 0)
@@ -411,7 +411,7 @@ tui_data_window::first_data_item_displayed ()
       struct tui_gen_win_info *data_item_win;
 
       data_item_win = regs_content[i].get ();
-      if (data_item_win->handle != NULL && data_item_win->is_visible)
+      if (data_item_win->is_visible ())
 	return i;
     }
 
@@ -427,7 +427,6 @@ tui_data_window::delete_data_content_windows ()
     {
       tui_delete_win (win->handle);
       win->handle = NULL;
-      win->is_visible = false;
     }
 }
 
@@ -552,7 +551,7 @@ void
 tui_check_register_values (struct frame_info *frame)
 {
   if (TUI_DATA_WIN != NULL
-      && TUI_DATA_WIN->is_visible)
+      && TUI_DATA_WIN->is_visible ())
     {
       if (TUI_DATA_WIN->regs_content.empty ()
 	  && TUI_DATA_WIN->display_regs)
@@ -667,7 +666,7 @@ tui_reg_command (const char *args, int from_tty)
       /* Make sure the register window is visible.  If not, select an
 	 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)
+      if (TUI_DATA_WIN == NULL || !TUI_DATA_WIN->is_visible ())
 	tui_reg_layout ();
 
       struct reggroup *current_group = NULL;

gdb/tui/tui-source.c

@@ -279,7 +279,7 @@ tui_source_window::~tui_source_window ()
 void
 tui_source_window::style_changed ()
 {
-  if (tui_active && is_visible)
+  if (tui_active && is_visible ())
     refill ();
 }
 

gdb/tui/tui-win.c

@@ -367,7 +367,7 @@ window_name_completer (completion_tracker &tracker,
       const char *completion_name = NULL;
 
       /* We can't focus on an invisible window.  */
-      if (!win_info->is_visible)
+      if (!win_info->is_visible ())
 	continue;
 
       completion_name = win_info->name ();
@@ -506,7 +506,7 @@ tui_refresh_all_win (void)
   tui_refresh_all ();
   for (tui_win_info *win_info : all_tui_windows ())
     {
-      if (win_info->is_visible)
+      if (win_info->is_visible ())
 	win_info->refresh_all ();
     }
   tui_show_locator_content ();
@@ -813,7 +813,7 @@ tui_set_focus_command (const char *arg, int from_tty)
       else
 	win_info = tui_partial_win_by_name (buf_ptr);
 
-      if (win_info == NULL || !win_info->is_visible)
+      if (win_info == NULL || !win_info->is_visible ())
 	warning (_("Invalid window specified. \n\
 The window name specified must be valid and visible.\n"));
       else
@@ -836,7 +836,7 @@ tui_all_windows_info (const char *arg, int from_tty)
   struct tui_win_info *win_with_focus = tui_win_with_focus ();
 
   for (tui_win_info *win_info : all_tui_windows ())
-    if (win_info->is_visible)
+    if (win_info->is_visible ())
       {
 	if (win_with_focus == win_info)
 	  printf_filtered ("        %s\t(%d lines)  <has focus>\n",
@@ -875,7 +875,7 @@ update_tab_width ()
 {
   for (tui_win_info *win_info : all_tui_windows ())
     {
-      if (win_info->is_visible)
+      if (win_info->is_visible ())
 	win_info->update_tab_width ();
     }
 }
@@ -956,7 +956,7 @@ tui_set_win_height_command (const char *arg, int from_tty)
 	    wname[i] = tolower (wname[i]);
 	  win_info = tui_partial_win_by_name (wname);
 
-	  if (win_info == NULL || !win_info->is_visible)
+	  if (win_info == NULL || !win_info->is_visible ())
 	    warning (_("Invalid window specified. \n\
 The window name specified must be valid and visible.\n"));
 	  else
@@ -1347,7 +1347,7 @@ parse_scrolling_args (const char *arg,
 
 	  if (*win_to_scroll == NULL)
 	    error (_("Unrecognized window `%s'"), wname);
-	  if (!(*win_to_scroll)->is_visible)
+	  if (!(*win_to_scroll)->is_visible ())
 	    error (_("Window is not visible"));
 	  else if (*win_to_scroll == TUI_CMD_WIN)
 	    *win_to_scroll = *(tui_source_windows ().begin ());

gdb/tui/tui-wingeneral.c

@@ -139,7 +139,6 @@ tui_make_window (struct tui_gen_win_info *win_info)
     {
       if (win_info->can_box ())
 	box_win (win_info, NO_HILITE);
-      win_info->is_visible = true;
       scrollok (handle, TRUE);
     }
 }
@@ -151,9 +150,8 @@ tui_make_window (struct tui_gen_win_info *win_info)
 void
 tui_gen_win_info::make_visible (bool visible)
 {
-  if (is_visible == visible)
+  if (is_visible () == visible)
     return;
-  is_visible = visible;
 
   if (visible)
     tui_make_window (this);
@@ -182,10 +180,10 @@ tui_refresh_all ()
 
   for (tui_win_info *win_info : all_tui_windows ())
     {
-      if (win_info->is_visible)
+      if (win_info->is_visible ())
 	win_info->refresh_window ();
     }
-  if (locator->is_visible)
+  if (locator->is_visible ())
     locator->refresh_window ();
 }
 

gdb/tui/tui.c

@@ -661,7 +661,7 @@ tui_is_window_visible (enum tui_win_type type)
   if (tui_win_list[type] == 0)
     return false;
   
-  return tui_win_list[type]->is_visible;
+  return tui_win_list[type]->is_visible ();
 }
 
 int