Introduce tui_data_window::line_from_reg_element_no method

This changes tui_line_from_reg_element_no to be a method on
tui_data_window, allowing for the removal of some uses of the
TUI_DATA_WIN global.  (Actually, in this particular patch, the number
of uses is not decreased, but rather the uses are moved to spots that
are already using the global, i.e., increasing the clustering.)

gdb/ChangeLog
2019-07-17  Tom Tromey  <tom@tromey.com>

	* tui/tui-windata.c (tui_display_data_from)
	(tui_data_window::do_scroll_vertical): Update.
	* tui/tui-regs.h (tui_line_from_reg_element_no): Don't declare.
	* tui/tui-regs.c (tui_data_window::line_from_reg_element_no):
	Rename from tui_line_from_reg_element_no.
	(tui_display_registers_from_line): Update.
	* tui/tui-data.h (struct tui_data_window)
	<line_from_reg_element_no>: New method.

5 files changed, 23 insertions, 10 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b63b9e9..9177dfd 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,16 @@
 2019-07-17  Tom Tromey  <tom@tromey.com>
 
+	* tui/tui-windata.c (tui_display_data_from)
+	(tui_data_window::do_scroll_vertical): Update.
+	* tui/tui-regs.h (tui_line_from_reg_element_no): Don't declare.
+	* tui/tui-regs.c (tui_data_window::line_from_reg_element_no):
+	Rename from tui_line_from_reg_element_no.
+	(tui_display_registers_from_line): Update.
+	* tui/tui-data.h (struct tui_data_window)
+	<line_from_reg_element_no>: New method.
+
+2019-07-17  Tom Tromey  <tom@tromey.com>
+
 	* tui/tui-regs.h (tui_last_regs_line_no): Don't declare.
 	* tui/tui-regs.c (tui_data_window::last_regs_line_no): Rename from
 	tui_last_regs_line_no.
diff --git a/gdb/tui/tui-data.h b/gdb/tui/tui-data.h
index 9b1e892..081d0df 100644
--- a/gdb/tui/tui-data.h
+++ b/gdb/tui/tui-data.h
@@ -494,6 +494,11 @@ struct tui_data_window : public tui_win_info
      are no registers (-1) is returned.  */
   int last_regs_line_no () const;
 
+  /* Answer the line number that the register element at element_no is
+     on.  If element_no is greater than the number of register
+     elements there are, -1 is returned.  */
+  int line_from_reg_element_no (int element_no) const;
+
 protected:
 
   void do_scroll_vertical (int num_to_scroll) override;
diff --git a/gdb/tui/tui-regs.c b/gdb/tui/tui-regs.c
index e9fbf4b..03e9149 100644
--- a/gdb/tui/tui-regs.c
+++ b/gdb/tui/tui-regs.c
@@ -79,21 +79,19 @@ tui_data_window::last_regs_line_no () const
   return num_lines;
 }
 
+/* See tui-data.h.  */
 
-/* Answer the line number that the register element at element_no is
-   on.  If element_no is greater than the number of register elements
-   there are, -1 is returned.  */
 int
-tui_line_from_reg_element_no (int element_no)
+tui_data_window::line_from_reg_element_no (int element_no) const
 {
-  if (element_no < TUI_DATA_WIN->regs_content.size ())
+  if (element_no < regs_content.size ())
     {
       int i, line = (-1);
 
       i = 1;
       while (line == (-1))
 	{
-	  if (element_no < TUI_DATA_WIN->regs_column_count * i)
+	  if (element_no < regs_column_count * i)
 	    line = i - 1;
 	  else
 	    i++;
@@ -391,7 +389,7 @@ tui_display_registers_from_line (int line_no,
 	     registers.  */
 	  if (line_no >= TUI_DATA_WIN->last_regs_line_no ())
 	    {
-	      if ((line = tui_line_from_reg_element_no (
+	      if ((line = TUI_DATA_WIN->line_from_reg_element_no (
 		 TUI_DATA_WIN->regs_content.size () - 1)) < 0)
 		line = 0;
 	    }
diff --git a/gdb/tui/tui-regs.h b/gdb/tui/tui-regs.h
index fcb440d..f6ed862 100644
--- a/gdb/tui/tui-regs.h
+++ b/gdb/tui/tui-regs.h
@@ -29,7 +29,6 @@ extern void tui_show_registers (struct reggroup *group);
 extern void tui_display_registers_from (int);
 extern int tui_display_registers_from_line (int, int);
 extern int tui_first_reg_element_inline (int);
-extern int tui_line_from_reg_element_no (int);
 extern int tui_first_reg_element_no_inline (int lineno);
 
 #endif /* TUI_TUI_REGS_H */
diff --git a/gdb/tui/tui-windata.c b/gdb/tui/tui-windata.c
index 7ff50a0..ac3e6d6 100644
--- a/gdb/tui/tui-windata.c
+++ b/gdb/tui/tui-windata.c
@@ -134,7 +134,7 @@ tui_display_data_from (int element_no, int reuse_windows)
   int first_line = (-1);
 
   if (element_no < TUI_DATA_WIN->regs_content.size ())
-    first_line = tui_line_from_reg_element_no (element_no);
+    first_line = TUI_DATA_WIN->line_from_reg_element_no (element_no);
   else
     { /* Calculate the first_line from the element number.  */
     }
@@ -173,7 +173,7 @@ tui_data_window::do_scroll_vertical (int num_to_scroll)
 
   first_element_no = first_data_item_displayed ();
   if (first_element_no < regs_content.size ())
-    first_line = tui_line_from_reg_element_no (first_element_no);
+    first_line = line_from_reg_element_no (first_element_no);
   else
     { /* Calculate the first line from the element number which is in
         the general data content.  */