gdb: add interp::on_inferior_disappeared method

Same idea as previous patches, but for inferior_disappeared.

For symmetry with on_inferior_appeared, I named this one
on_inferior_disappeared, despite the observer being called
inferior_exit.  This is called when detaching an inferior, so I think
that calling it "disappeared" is a bit less misleading (the observer
should probably be renamed later).

Change-Id: I372101586bc9454997953c1e540a2a6685f53ef6

gdb/inferior.c

@@ -283,6 +283,15 @@ delete_inferior (struct inferior *inf)
   delete inf;
 }
 
+/* Notify interpreters and observers that inferior INF disappeared.  */
+
+static void
+notify_inferior_disappeared (inferior *inf)
+{
+  interps_notify_inferior_disappeared (inf);
+  gdb::observers::inferior_exit.notify (inf);
+}
+
 /* If SILENT then be quiet -- don't announce a inferior exit, or the
    exit of its threads.  */
 
@@ -291,7 +300,7 @@ exit_inferior_1 (struct inferior *inf, int silent)
 {
   inf->clear_thread_list (silent);
 
-  gdb::observers::inferior_exit.notify (inf);
+  notify_inferior_disappeared (inf);
 
   inf->pid = 0;
   inf->fake_pid_p = false;

gdb/interps.c

@@ -478,6 +478,14 @@ interps_notify_inferior_appeared (inferior *inf)
   interps_notify (&interp::on_inferior_appeared, inf);
 }
 
+/* See interps.h.  */
+
+void
+interps_notify_inferior_disappeared (inferior *inf)
+{
+  interps_notify (&interp::on_inferior_disappeared, inf);
+}
+
 /* This just adds the "interpreter-exec" command.  */
 void _initialize_interpreter ();
 void

gdb/interps.h

@@ -128,6 +128,9 @@ public:
   /* Notify the interpreter that inferior INF was started or attached.  */
   virtual void on_inferior_appeared (inferior *inf) {}
 
+  /* Notify the interpreter that inferior INF exited or was detached.  */
+  virtual void on_inferior_disappeared (inferior *inf) {}
+
 private:
   /* The memory for this is static, it comes from literal strings (e.g. "cli").  */
   const char *m_name;
@@ -251,6 +254,9 @@ extern void interps_notify_inferior_added (inferior *inf);
 /* Notify all interpreters that inferior INF was started or attached.  */
 extern void interps_notify_inferior_appeared (inferior *inf);
 
+/* Notify all interpreters that inferior INF exited or was detached.  */
+extern void interps_notify_inferior_disappeared (inferior *inf);
+
 /* well-known interpreters */
 #define INTERP_CONSOLE		"console"
 #define INTERP_MI2             "mi2"

gdb/mi/mi-interp.c

@@ -62,7 +62,6 @@ static void mi_remove_notify_hooks (void);
 
 static void mi_record_changed (struct inferior*, int, const char *,
 			       const char *);
-static void mi_inferior_exit (struct inferior *inf);
 static void mi_inferior_removed (struct inferior *inf);
 static void mi_on_resume (ptid_t ptid);
 static void mi_solib_loaded (struct so_list *solib);
@@ -379,29 +378,21 @@ mi_interp::on_inferior_appeared (inferior *inf)
   gdb_flush (this->event_channel);
 }
 
-static void
+void
-mi_inferior_exit (struct inferior *inf)
+mi_interp::on_inferior_disappeared (inferior *inf)
 {
-  SWITCH_THRU_ALL_UIS ()
-    {
-      struct mi_interp *mi = as_mi_interp (top_level_interpreter ());
-
-      if (mi == NULL)
-	continue;
-
   target_terminal::scoped_restore_terminal_state term_state;
   target_terminal::ours_for_output ();
 
   if (inf->has_exit_code)
-	gdb_printf (mi->event_channel,
+    gdb_printf (this->event_channel,
 		"thread-group-exited,id=\"i%d\",exit-code=\"%s\"",
 		inf->num, int_string (inf->exit_code, 8, 0, 0, 1));
   else
-	gdb_printf (mi->event_channel,
+    gdb_printf (this->event_channel,
 		"thread-group-exited,id=\"i%d\"", inf->num);
 
-      gdb_flush (mi->event_channel);
+  gdb_flush (this->event_channel);
-    }
 }
 
 static void
@@ -1130,7 +1121,6 @@ _initialize_mi_interp ()
   interp_factory_register (INTERP_MI4, mi_interp_factory);
   interp_factory_register (INTERP_MI, mi_interp_factory);
 
-  gdb::observers::inferior_exit.attach (mi_inferior_exit, "mi-interp");
   gdb::observers::inferior_removed.attach (mi_inferior_removed, "mi-interp");
   gdb::observers::record_changed.attach (mi_record_changed, "mi-interp");
   gdb::observers::target_resumed.attach (mi_on_resume, "mi-interp");

gdb/mi/mi-interp.h

@@ -54,6 +54,7 @@ public:
   void on_thread_exited (thread_info *t, int silent) override;
   void on_inferior_added (inferior *inf) override;
   void on_inferior_appeared (inferior *inf) override;
+  void on_inferior_disappeared (inferior *inf) override;
 
   /* MI's output channels */
   mi_console_file *out;