Create subclasses for different window types

This changes the TUI so that each different major window type has its
own subclass.

gdb/ChangeLog
2019-06-25  Tom Tromey  <tom@tromey.com>

	* tui/tui-data.h (struct tui_win_info): Make constructor
	protected.  Make destructor virtual.  Add initializers.
	(tui_source_window, tui_data_window, tui_cmd_window): New
	classes.
	* tui/tui-data.c (tui_win_info): Rename from init_win_info.  Now a
	constructor.  Add "type" parameter.
	(tui_source_window, tui_data_window, tui_cmd_window): New
	constructors.
	(tui_alloc_win_info): Instantiate the appropriate subclass.

gdb/ChangeLog

@@ -1,3 +1,15 @@
+2019-06-25  Tom Tromey  <tom@tromey.com>
+
+	* tui/tui-data.h (struct tui_win_info): Make constructor
+	protected.  Make destructor virtual.  Add initializers.
+	(tui_source_window, tui_data_window, tui_cmd_window): New
+	classes.
+	* tui/tui-data.c (tui_win_info): Rename from init_win_info.  Now a
+	constructor.  Add "type" parameter.
+	(tui_source_window, tui_data_window, tui_cmd_window): New
+	constructors.
+	(tui_alloc_win_info): Instantiate the appropriate subclass.
+
 2019-06-25  Tom Tromey  <tom@tromey.com>
 
 	* tui/tui-win.c (tui_resize_all): Use delete.

gdb/tui/tui-data.c

@@ -495,47 +495,59 @@ init_content_element (struct tui_win_element *element,
     }
 }
 
-static void
+tui_win_info::tui_win_info (enum tui_win_type type)
-init_win_info (struct tui_win_info *win_info)
 {
-  tui_init_generic_part (&win_info->generic);
+  generic.type = type;
-  win_info->can_highlight =
+  tui_init_generic_part (&generic);
-    win_info->is_highlighted = FALSE;
-  switch (win_info->generic.type)
-    {
-    case SRC_WIN:
-    case DISASSEM_WIN:
-      win_info->detail.source_info.execution_info = NULL;
-      win_info->detail.source_info.has_locator = FALSE;
-      win_info->detail.source_info.horizontal_offset = 0;
-      win_info->detail.source_info.gdbarch = NULL;
-      win_info->detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;
-      win_info->detail.source_info.start_line_or_addr.u.addr = 0;
-      win_info->detail.source_info.fullname = NULL;
-      break;
-    case DATA_WIN:
-      win_info->detail.data_display_info.data_content = NULL;
-      win_info->detail.data_display_info.data_content_count = 0;
-      win_info->detail.data_display_info.regs_content = NULL;
-      win_info->detail.data_display_info.regs_content_count = 0;
-      win_info->detail.data_display_info.regs_column_count = 1;
-      win_info->detail.data_display_info.display_regs = FALSE;
-      win_info->detail.data_display_info.current_group = 0;
-      break;
-    case CMD_WIN:
-      break;
-    }
 }
 
+tui_source_window::tui_source_window (enum tui_win_type type)
+  : tui_win_info (type)
+{
+  gdb_assert (type == SRC_WIN || type == DISASSEM_WIN);
+  detail.source_info.execution_info = NULL;
+  detail.source_info.has_locator = FALSE;
+  detail.source_info.horizontal_offset = 0;
+  detail.source_info.gdbarch = NULL;
+  detail.source_info.start_line_or_addr.loa = LOA_ADDRESS;
+  detail.source_info.start_line_or_addr.u.addr = 0;
+  detail.source_info.fullname = NULL;
+}
+
+tui_data_window::tui_data_window ()
+  : tui_win_info (DATA_WIN)
+{
+  detail.data_display_info.data_content = (tui_win_content) NULL;
+  detail.data_display_info.data_content_count = 0;
+  detail.data_display_info.regs_content = (tui_win_content) NULL;
+  detail.data_display_info.regs_content_count = 0;
+  detail.data_display_info.regs_column_count = 1;
+  detail.data_display_info.display_regs = FALSE;
+  detail.data_display_info.current_group = 0;
+}
+
+tui_cmd_window::tui_cmd_window ()
+  : tui_win_info (CMD_WIN)
+{
+}
 
 struct tui_win_info *
 tui_alloc_win_info (enum tui_win_type type)
 {
-  struct tui_win_info *win_info = new struct tui_win_info (type);
+  switch (type)
+    {
+    case SRC_WIN:
+    case DISASSEM_WIN:
+      return new tui_source_window (type);
 
-  init_win_info (win_info);
+    case DATA_WIN:
+      return new tui_data_window ();
 
-  return win_info;
+    case CMD_WIN:
+      return new tui_cmd_window ();
+    }
+
+  gdb_assert_not_reached (_("Unhandled window type"));
 }
 
 

gdb/tui/tui-data.h

@@ -271,15 +271,15 @@ struct tui_command_info
 /* This defines information about each logical window.  */
 struct tui_win_info
 {
-  explicit tui_win_info (enum tui_win_type type)
+protected:
-  {
-    generic.type = type;
-  }
-
-  ~tui_win_info ();
 
+  explicit tui_win_info (enum tui_win_type type);
   DISABLE_COPY_AND_ASSIGN (tui_win_info);
 
+public:
+
+  virtual ~tui_win_info ();
+
   struct tui_gen_win_info generic;	/* General window information.  */
   union
   {
@@ -288,8 +288,30 @@ struct tui_win_info
     struct tui_command_info command_info;
   }
   detail;
-  int can_highlight;	/* Can this window ever be highlighted?  */
+
-  int is_highlighted;	/* Is this window highlighted?  */
+  /* Can this window ever be highlighted?  */
+  int can_highlight = 0;
+
+  /* Is this window highlighted?  */
+  int is_highlighted = 0;
+};
+
+struct tui_source_window : public tui_win_info
+{
+  explicit tui_source_window (enum tui_win_type type);
+  DISABLE_COPY_AND_ASSIGN (tui_source_window);
+};
+
+struct tui_data_window : public tui_win_info
+{
+  tui_data_window ();
+  DISABLE_COPY_AND_ASSIGN (tui_data_window);
+};
+
+struct tui_cmd_window : public tui_win_info
+{
+  tui_cmd_window ();
+  DISABLE_COPY_AND_ASSIGN (tui_cmd_window);
 };
 
 extern int tui_win_is_source_type (enum tui_win_type win_type);