[RFA 04/22] Use scoped_restore for current_ui

[Tom Tromey <tom@tromey.com>]

This changes most uses of make_cleanup_restore_current_ui to use
scoped_restore.  The use in switch_thru_all_uis_init still remains;
that can be dealt with by replacing this iterator with a real class.

2016-09-26  Tom Tromey  <tom@tromey.com>

	* top.c (new_ui_command, wait_sync_command_done)
	(gdb_readline_wrapper): Use scoped_restore.
	* infrun.c (fetch_inferior_event): Use scoped_restore.
	* infcall.c (call_thread_fsm_should_stop): Use scoped_restore.
---
 gdb/ChangeLog |  7 +++++++
 gdb/infcall.c |  8 +-------
 gdb/infrun.c  |  3 +--
 gdb/top.c     | 44 ++++++++++++++++++++++----------------------
 4 files changed, 31 insertions(+), 31 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index da69ce8..42c432d 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,12 @@
 2016-09-26  Tom Tromey  <tom@tromey.com>
 
+	* top.c (new_ui_command, wait_sync_command_done)
+	(gdb_readline_wrapper): Use scoped_restore.
+	* infrun.c (fetch_inferior_event): Use scoped_restore.
+	* infcall.c (call_thread_fsm_should_stop): Use scoped_restore.
+
+2016-09-26  Tom Tromey  <tom@tromey.com>
+
 	* utils.c (make_cleanup_restore_ui_file, do_restore_ui_file)
 	(struct restore_ui_file_closure): Remove.
 	* utils.h (make_cleanup_restore_ui_file): Don't declare.
diff --git a/gdb/infcall.c b/gdb/infcall.c
index 3c33c11..60b0a70 100644
--- a/gdb/infcall.c
+++ b/gdb/infcall.c
@@ -519,8 +519,6 @@ call_thread_fsm_should_stop (struct thread_fsm *self,
 
   if (stop_stack_dummy == STOP_STACK_DUMMY)
     {
-      struct cleanup *old_chain;
-
       /* Done.  */
       thread_fsm_set_finished (self);
 
@@ -530,13 +528,9 @@ call_thread_fsm_should_stop (struct thread_fsm *self,
       f->return_value = get_call_return_value (&f->return_meta_info);
 
       /* Break out of wait_sync_command_done.  */
-      old_chain = make_cleanup_restore_current_ui ();
-      current_ui = f->waiting_ui;
+      scoped_restore<struct ui *> save_ui (&current_ui, f->waiting_ui);
       target_terminal_ours ();
       f->waiting_ui->prompt_state = PROMPT_NEEDED;
-
-      /* This restores the previous UI.  */
-      do_cleanups (old_chain);
     }
 
   return 1;
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 7832a5d..6d96af9 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -3903,8 +3903,7 @@ fetch_inferior_event (void *client_data)
   /* Events are always processed with the main UI as current UI.  This
      way, warnings, debug output, etc. are always consistently sent to
      the main console.  */
-  make_cleanup_restore_current_ui ();
-  current_ui = main_ui;
+  scoped_restore<struct ui *> save_ui (&current_ui, main_ui);
 
   /* End up with readline processing input, if necessary.  */
   make_cleanup (reinstall_readline_callback_handler_cleanup, NULL);
diff --git a/gdb/top.c b/gdb/top.c
index d782466..77845c0 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -386,33 +386,35 @@ new_ui_command (char *args, int from_tty)
   interpreter_name = argv[0];
   tty_name = argv[1];
 
-  make_cleanup_restore_current_ui ();
+  {
+    scoped_restore<struct ui *> save_ui (&current_ui);
 
-  failure_chain = make_cleanup (null_cleanup, NULL);
+    failure_chain = make_cleanup (null_cleanup, NULL);
 
-  /* Open specified terminal, once for each of
-     stdin/stdout/stderr.  */
-  for (i = 0; i < 3; i++)
-    {
-      stream[i] = open_terminal_stream (tty_name);
-      make_cleanup_fclose (stream[i]);
-    }
+    /* Open specified terminal, once for each of
+       stdin/stdout/stderr.  */
+    for (i = 0; i < 3; i++)
+      {
+	stream[i] = open_terminal_stream (tty_name);
+	make_cleanup_fclose (stream[i]);
+      }
 
-  ui = new_ui (stream[0], stream[1], stream[2]);
-  make_cleanup (delete_ui_cleanup, ui);
+    ui = new_ui (stream[0], stream[1], stream[2]);
+    make_cleanup (delete_ui_cleanup, ui);
 
-  ui->async = 1;
+    ui->async = 1;
 
-  current_ui = ui;
+    current_ui = ui;
 
-  set_top_level_interpreter (interpreter_name);
+    set_top_level_interpreter (interpreter_name);
 
-  interp_pre_command_loop (top_level_interpreter ());
+    interp_pre_command_loop (top_level_interpreter ());
 
-  discard_cleanups (failure_chain);
+    discard_cleanups (failure_chain);
 
-  /* This restores the previous UI and frees argv.  */
-  do_cleanups (success_chain);
+    /* This restores the previous UI and frees argv.  */
+    do_cleanups (success_chain);
+  }
 
   printf_unfiltered ("New UI allocated\n");
 }
@@ -562,14 +564,12 @@ void
 wait_sync_command_done (void)
 {
   /* Processing events may change the current UI.  */
-  struct cleanup *old_chain = make_cleanup_restore_current_ui ();
+  scoped_restore<struct ui *> save_ui (&current_ui);
   struct ui *ui = current_ui;
 
   while (gdb_do_one_event () >= 0)
     if (ui->prompt_state != PROMPT_BLOCKED)
       break;
-
-  do_cleanups (old_chain);
 }
 
 /* See top.h.  */
@@ -1031,7 +1031,7 @@ gdb_readline_wrapper (const char *prompt)
   back_to = make_cleanup (gdb_readline_wrapper_cleanup, cleanup);
 
   /* Processing events may change the current UI.  */
-  make_cleanup_restore_current_ui ();
+  scoped_restore<struct ui *> save_ui (&current_ui);
 
   if (cleanup->target_is_async_orig)
     target_async (0);
-- 
2.7.4