gdb/tui: use tui_batch_rendering more

While working on the commit:

  commit 4f28b020a3416ac87ac12cf7ae3625a4bc178975
  Date:   Wed Feb 5 20:12:03 2025 +0000

      gdb/tui: use wrefresh if output is not surpressed

I spotted some places where tui_win_info::refresh_window() was being
called when suppress_output was false.  This means that there is no
tui_batch_rendering in place on the call stack, and so, after that
commit, we might be performing more wrefresh() calls than necessary.

Before the above commit we would have been calling wnoutrefresh() and,
due to the missing tui_batch_rendering, there might have been a delay
before doupdate() was called.

To (hopefully) make screen updates smoother, this commit adds
tui_batch_rendering in a few places where it is possible that there
might be multiple window updates performed, this will mean the final
write to screen is deferred until the tui_batch_rendering goes out of
scope.

Other than possibly smother screen updates, there should be no user
visible changes after this commit.

Approved-By: Tom Tromey <tom@tromey.com>

4 files changed, 14 insertions, 2 deletions

diff --git a/gdb/tui/tui-hooks.c b/gdb/tui/tui-hooks.c
index 25358d0..69294cc 100644
--- a/gdb/tui/tui-hooks.c
+++ b/gdb/tui/tui-hooks.c
@@ -35,6 +35,7 @@
 #include "tui/tui-regs.h"
 #include "tui/tui-status.h"
 #include "tui/tui-winsource.h"
+#include "tui/tui-wingeneral.h"
 
 static void
 tui_new_objfile_hook (struct objfile* objfile)
@@ -106,6 +107,8 @@ tui_refresh_frame_and_register_information ()
   target_terminal::scoped_restore_terminal_state term_state;
   target_terminal::ours_for_output ();
 
+  tui_batch_rendering defer;
+
   if (from_stack)
     {
       frame_info_ptr fi;
@@ -150,6 +153,8 @@ tui_dummy_print_frame_info_listing_hook (struct symtab *s,
 static void
 tui_inferior_exit (struct inferior *inf)
 {
+  tui_batch_rendering defer;
+
   /* Leave the SingleKey mode to make sure the gdb prompt is visible.  */
   tui_set_key_mode (TUI_COMMAND_MODE);
   tui_show_frame_info (0);
diff --git a/gdb/tui/tui-win.c b/gdb/tui/tui-win.c
index 33b24d8..95639f5 100644
--- a/gdb/tui/tui-win.c
+++ b/gdb/tui/tui-win.c
@@ -969,6 +969,8 @@ tui_set_win_size (const char *arg, bool set_width_p)
 	      new_size = curr_size + input_no;
 	    }
 
+	  tui_batch_rendering defer;
+
 	  /* Now change the window's height, and adjust
 	     all other windows around it.  */
 	  if (set_width_p)
diff --git a/gdb/tui/tui-winsource.c b/gdb/tui/tui-winsource.c
index 83d9fc0..587162b 100644
--- a/gdb/tui/tui-winsource.c
+++ b/gdb/tui/tui-winsource.c
@@ -37,6 +37,7 @@
 #include "tui/tui-source.h"
 #include "tui/tui-disasm.h"
 #include "tui/tui-location.h"
+#include "tui/tui-wingeneral.h"
 #include "gdb_curses.h"
 
 /* Function to display the "main" routine.  */
@@ -52,10 +53,10 @@ tui_display_main ()
       tui_get_begin_asm_address (&gdbarch, &addr);
       if (addr != (CORE_ADDR) 0)
 	{
-	  struct symtab *s;
+	  tui_batch_rendering defer;
 
 	  tui_update_source_windows_with_addr (gdbarch, addr);
-	  s = find_pc_line_symtab (addr);
+	  struct symtab *s = find_pc_line_symtab (addr);
 	  tui_location.set_location (s);
 	}
     }
@@ -607,6 +608,8 @@ tui_source_window_base::set_is_exec_point_at (struct tui_line_or_address l)
 void
 tui_update_all_breakpoint_info (struct breakpoint *being_deleted)
 {
+  tui_batch_rendering defer;
+
   for (tui_source_window_base *win : tui_source_windows ())
     {
       if (win->update_breakpoint_info (being_deleted, false))
diff --git a/gdb/tui/tui.c b/gdb/tui/tui.c
index 59aa1bc..8b79d8b 100644
--- a/gdb/tui/tui.c
+++ b/gdb/tui/tui.c
@@ -387,6 +387,8 @@ tui_enable (void)
   if (tui_active)
     return;
 
+  tui_batch_rendering defer;
+
   /* To avoid to initialize curses when gdb starts, there is a deferred
      curses initialization.  This initialization is made only once
      and the first time the curses mode is entered.  */