[19/30] gdb: add interp::on_solib_loaded method

diff --git a/gdb/interps.c b/gdb/interps.c
index 17ea42499f95..6dde83b45e79 100644
--- a/gdb/interps.c
+++ b/gdb/interps.c
@@ -511,6 +511,14 @@  interps_notify_target_resumed (ptid_t ptid)
   interps_notify (&interp::on_target_resumed, ptid);
 }
 
+/* See interps.h.  */
+
+void
+interps_notify_solib_loaded (so_list *so)
+{
+  interps_notify (&interp::on_solib_loaded, so);
+}
+
 /* This just adds the "interpreter-exec" command.  */
 void _initialize_interpreter ();
 void
diff --git a/gdb/interps.h b/gdb/interps.h
index 0434efe40b3c..7fce025aad69 100644
--- a/gdb/interps.h
+++ b/gdb/interps.h
@@ -31,6 +31,7 @@  struct ui;
 class completion_tracker;
 struct thread_info;
 struct inferior;
+struct so_list;
 
 typedef struct interp *(*interp_factory_func) (const char *name);
 
@@ -142,6 +143,9 @@  class interp : public intrusive_list_node<interp>
   /* Notify the interpreter that the target was resumed.  */
   virtual void on_target_resumed (ptid_t ptid) {}
 
+  /* Notify the interpreter that solib SO has been loaded.  */
+  virtual void on_solib_loaded (so_list *so) {}
+
 private:
   /* The memory for this is static, it comes from literal strings (e.g. "cli").  */
   const char *m_name;
@@ -287,6 +291,9 @@  extern void interps_notify_record_changed (inferior *inf, int started,
 /* Notify all interpreters that the target was resumed.  */
 extern void interps_notify_target_resumed (ptid_t ptid);
 
+/* Notify all interpreters that solib SO has been loaded.  */
+extern void interps_notify_solib_loaded (so_list *so);
+
 /* well-known interpreters */
 #define INTERP_CONSOLE		"console"
 #define INTERP_MI2             "mi2"
diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index 5c944febf427..f0694cacfc86 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -60,7 +60,6 @@  static int mi_interp_query_hook (const char *ctlstr, va_list ap)
 static void mi_insert_notify_hooks (void);
 static void mi_remove_notify_hooks (void);
 
-static void mi_solib_loaded (struct so_list *solib);
 static void mi_solib_unloaded (struct so_list *solib);
 static void mi_about_to_proceed (void);
 static void mi_traceframe_changed (int tfnum, int tpnum);
@@ -844,30 +843,21 @@  mi_output_solib_attribs (ui_out *uiout, struct so_list *solib)
     }
 }
 
-static void
-mi_solib_loaded (struct so_list *solib)
+void
+mi_interp::on_solib_loaded (so_list *solib)
 {
-  SWITCH_THRU_ALL_UIS ()
-    {
-      struct mi_interp *mi = as_mi_interp (top_level_interpreter ());
-      struct ui_out *uiout;
+  ui_out *uiout = this->interp_ui_out ();
 
-      if (mi == NULL)
-	continue;
-
-      uiout = top_level_interpreter ()->interp_ui_out ();
+  target_terminal::scoped_restore_terminal_state term_state;
+  target_terminal::ours_for_output ();
 
-      target_terminal::scoped_restore_terminal_state term_state;
-      target_terminal::ours_for_output ();
+  gdb_printf (this->event_channel, "library-loaded");
 
-      gdb_printf (mi->event_channel, "library-loaded");
+  ui_out_redirect_pop redir (uiout, this->event_channel);
 
-      ui_out_redirect_pop redir (uiout, mi->event_channel);
+  mi_output_solib_attribs (uiout, solib);
 
-      mi_output_solib_attribs (uiout, solib);
-
-      gdb_flush (mi->event_channel);
-    }
+  gdb_flush (this->event_channel);
 }
 
 static void
@@ -1082,7 +1072,6 @@  _initialize_mi_interp ()
   interp_factory_register (INTERP_MI4, mi_interp_factory);
   interp_factory_register (INTERP_MI, mi_interp_factory);
 
-  gdb::observers::solib_loaded.attach (mi_solib_loaded, "mi-interp");
   gdb::observers::solib_unloaded.attach (mi_solib_unloaded, "mi-interp");
   gdb::observers::about_to_proceed.attach (mi_about_to_proceed, "mi-interp");
   gdb::observers::traceframe_changed.attach (mi_traceframe_changed,
diff --git a/gdb/mi/mi-interp.h b/gdb/mi/mi-interp.h
index fc0d8218ba73..62dee1cdfb5e 100644
--- a/gdb/mi/mi-interp.h
+++ b/gdb/mi/mi-interp.h
@@ -59,6 +59,7 @@  class mi_interp final : public interp
   void on_record_changed (inferior *inf, int started, const char *method,
 			  const char *format) override;
   void on_target_resumed (ptid_t ptid) override;
+  void on_solib_loaded (so_list *so) override;
 
   /* MI's output channels */
   mi_console_file *out;
diff --git a/gdb/solib.c b/gdb/solib.c
index 16147830ef2c..fc23d284b8a0 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -760,6 +760,15 @@  solib_used (const struct so_list *const known)
   return false;
 }
 
+/* Notify interpreters and observers that solib SO has been loaded.  */
+
+static void
+notify_solib_loaded (so_list *so)
+{
+  interps_notify_solib_loaded (so);
+  gdb::observers::solib_loaded.notify (so);
+}
+
 /* See solib.h.  */
 
 void
@@ -920,7 +929,7 @@  update_solib_list (int from_tty)
 
 	  /* Notify any observer that the shared object has been
 	     loaded now that we've added it to GDB's tables.  */
-	  gdb::observers::solib_loaded.notify (i);
+	  notify_solib_loaded (i);
 	}
 
       /* If a library was not found, issue an appropriate warning