gdb/tui: more debug output

Add some additional debug output that I've found really useful while
working on the previous set of patches.

Unless tui debug is turned on, then there should be no user visible
changes with this commit.

gdb/tui/tui-winsource.c

@@ -316,6 +316,8 @@ tui_source_window_base::show_source_line (int lineno)
 void
 tui_source_window_base::refresh_window ()
 {
+  TUI_SCOPED_DEBUG_START_END ("window `%s`", name ());
+
   /* tui_win_info::refresh_window would draw the empty background window to
      the screen, potentially creating a flicker.  */
   wnoutrefresh (handle.get ());
@@ -326,6 +328,12 @@ tui_source_window_base::refresh_window ()
   int content_width = m_max_length;
   int pad_x = m_horizontal_offset - m_pad_offset;
 
+  tui_debug_printf ("pad_width = %d, left_margin = %d, view_width = %d",
+		    pad_width, left_margin, view_width);
+  tui_debug_printf ("content_width = %d, pad_x = %d, m_horizontal_offset = %d",
+		    content_width, pad_x, m_horizontal_offset);
+  tui_debug_printf ("m_pad_offset = %d", m_pad_offset);
+
   gdb_assert (m_pad_offset >= 0);
   gdb_assert (m_horizontal_offset + view_width
 	      <= std::max (content_width, view_width));
@@ -346,6 +354,8 @@ tui_source_window_base::refresh_window ()
 void
 tui_source_window_base::show_source_content ()
 {
+  TUI_SCOPED_DEBUG_START_END ("window `%s`", name ());
+
   gdb_assert (!m_content.empty ());
 
   /* The pad should be at least as wide as the window, but ideally, as wide
@@ -390,6 +400,8 @@ tui_source_window_base::show_source_content ()
 	}
 
       m_pad_requested_width = required_pad_width;
+      tui_debug_printf ("requested width %d, allocated width %d",
+			required_pad_width, getmaxx (m_pad.get ()));
     }
 
   gdb_assert (m_pad != nullptr);
@@ -431,6 +443,8 @@ tui_source_window_base::update_tab_width ()
 void
 tui_source_window_base::rerender ()
 {
+  TUI_SCOPED_DEBUG_START_END ("window `%s`", name ());
+
   if (!m_content.empty ())
     {
       struct symtab_and_line cursal
@@ -492,6 +506,8 @@ tui_source_window_base::refill ()
 bool
 tui_source_window_base::validate_scroll_offsets ()
 {
+  TUI_SCOPED_DEBUG_START_END ("window `%s`", name ());
+
   int original_pad_offset = m_pad_offset;
 
   if (m_horizontal_offset < 0)
@@ -501,6 +517,11 @@ tui_source_window_base::validate_scroll_offsets ()
   int pad_width = getmaxx (m_pad.get ());
   int view_width = this->view_width ();
 
+  tui_debug_printf ("pad_width = %d, view_width = %d, content_width = %d",
+		    pad_width, view_width, content_width);
+  tui_debug_printf ("original_pad_offset = %d, m_horizontal_offset = %d",
+		    original_pad_offset, m_horizontal_offset);
+
   if (m_horizontal_offset + view_width > content_width)
     m_horizontal_offset = std::max (content_width - view_width, 0);
 

gdb/tui/tui.h

@@ -36,6 +36,9 @@ extern bool debug_tui;
 #define TUI_SCOPED_DEBUG_ENTER_EXIT \
   scoped_debug_enter_exit (debug_tui, "tui")
 
+#define TUI_SCOPED_DEBUG_START_END(fmt, ...) \
+  scoped_debug_start_end (debug_tui, "tui", fmt, ##__VA_ARGS__)
+
 struct ui_file;
 
 /* Types of error returns.  */