gdb: add interp::on_traceframe_changed method

Same idea as previous patches, but for traceframe_changed.

Change-Id: Ia473f07d70d57b30aca0094d0e0585d7e0d95637

gdb/interps.c

@@ -527,6 +527,14 @@ interps_notify_solib_unloaded (so_list *so)
   interps_notify (&interp::on_solib_unloaded, so);
 }
 
+/* See interps.h.  */
+
+void
+interps_notify_traceframe_changed (int tfnum, int tpnum)
+{
+  interps_notify (&interp::on_traceframe_changed, tfnum, tpnum);
+}
+
 /* This just adds the "interpreter-exec" command.  */
 void _initialize_interpreter ();
 void

gdb/interps.h

@@ -153,6 +153,9 @@ public:
      the inferior to proceed.  */
   virtual void on_about_to_proceed () {}
 
+  /* Notify the interpreter that the selected traceframe changed.  */
+  virtual void on_traceframe_changed (int tfnum, int tpnum) {}
+
 private:
   /* The memory for this is static, it comes from literal strings (e.g. "cli").  */
   const char *m_name;
@@ -304,6 +307,13 @@ extern void interps_notify_solib_loaded (so_list *so);
 /* Notify all interpreters that solib SO has been unloaded.  */
 extern void interps_notify_solib_unloaded (so_list *so);
 
+/* Notify all interpreters that the selected traceframe changed.
+
+   The trace frame is changed to TFNUM (e.g., by using the 'tfind' command).
+   If TFNUM is negative, it means gdb resumed live debugging.  The number of
+   the tracepoint associated with this traceframe is TPNUM.  */
+extern void interps_notify_traceframe_changed (int tfnum, int tpnum);
+
 /* well-known interpreters */
 #define INTERP_CONSOLE		"console"
 #define INTERP_MI2             "mi2"

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_traceframe_changed (int tfnum, int tpnum);
 static void mi_tsv_created (const struct trace_state_variable *tsv);
 static void mi_tsv_deleted (const struct trace_state_variable *tsv);
 static void mi_tsv_modified (const struct trace_state_variable *tsv);
@@ -495,33 +494,23 @@ struct mi_suppress_notification mi_suppress_notification =
     0,
   };
 
-/* Emit notification on changing a traceframe.  */
-
-static void
-mi_traceframe_changed (int tfnum, int tpnum)
+void
+mi_interp::on_traceframe_changed (int tfnum, int tpnum)
 {
   if (mi_suppress_notification.traceframe)
     return;
 
-  SWITCH_THRU_ALL_UIS ()
-    {
-      struct mi_interp *mi = as_mi_interp (top_level_interpreter ());
+  target_terminal::scoped_restore_terminal_state term_state;
+  target_terminal::ours_for_output ();
 
-      if (mi == NULL)
-	continue;
+  if (tfnum >= 0)
+    gdb_printf (this->event_channel, "traceframe-changed,"
+		"num=\"%d\",tracepoint=\"%d\"",
+		tfnum, tpnum);
+  else
+    gdb_printf (this->event_channel, "traceframe-changed,end");
 
-      target_terminal::scoped_restore_terminal_state term_state;
-      target_terminal::ours_for_output ();
-
-      if (tfnum >= 0)
-	gdb_printf (mi->event_channel, "traceframe-changed,"
-		    "num=\"%d\",tracepoint=\"%d\"",
-		    tfnum, tpnum);
-      else
-	gdb_printf (mi->event_channel, "traceframe-changed,end");
-
-      gdb_flush (mi->event_channel);
-    }
+  gdb_flush (this->event_channel);
 }
 
 /* Emit notification on creating a trace state variable.  */
@@ -1055,8 +1044,6 @@ _initialize_mi_interp ()
   interp_factory_register (INTERP_MI4, mi_interp_factory);
   interp_factory_register (INTERP_MI, mi_interp_factory);
 
-  gdb::observers::traceframe_changed.attach (mi_traceframe_changed,
-					     "mi-interp");
   gdb::observers::tsv_created.attach (mi_tsv_created, "mi-interp");
   gdb::observers::tsv_deleted.attach (mi_tsv_deleted, "mi-interp");
   gdb::observers::tsv_modified.attach (mi_tsv_modified, "mi-interp");

gdb/mi/mi-interp.h

@@ -62,6 +62,7 @@ public:
   void on_solib_loaded (so_list *so) override;
   void on_solib_unloaded (so_list *so) override;
   void on_about_to_proceed () override;
+  void on_traceframe_changed (int tfnum, int tpnum) override;
 
   /* MI's output channels */
   mi_console_file *out;

gdb/observable.c

@@ -51,7 +51,6 @@ DEFINE_OBSERVABLE (about_to_proceed);
 DEFINE_OBSERVABLE (breakpoint_created);
 DEFINE_OBSERVABLE (breakpoint_deleted);
 DEFINE_OBSERVABLE (breakpoint_modified);
-DEFINE_OBSERVABLE (traceframe_changed);
 DEFINE_OBSERVABLE (architecture_changed);
 DEFINE_OBSERVABLE (thread_ptid_changed);
 DEFINE_OBSERVABLE (inferior_added);

gdb/observable.h

@@ -140,12 +140,6 @@ extern observable<struct breakpoint */* b */> breakpoint_deleted;
    is the modified breakpoint.  */
 extern observable<struct breakpoint */* b */> breakpoint_modified;
 
-/* The trace frame is changed to TFNUM (e.g., by using the 'tfind'
-   command).  If TFNUM is negative, it means gdb resumes live
-   debugging.  The number of the tracepoint associated with this
-   traceframe is TPNUM.  */
-extern observable<int /* tfnum */, int /* tpnum */> traceframe_changed;
-
 /* The current architecture has changed.  The argument NEWARCH is a
    pointer to the new architecture.  */
 extern observable<struct gdbarch */* newarch */> architecture_changed;

gdb/tracepoint.c

@@ -59,6 +59,7 @@
 #include "cli/cli-style.h"
 #include "expop.h"
 #include "gdbsupport/buildargv.h"
+#include "interps.h"
 
 #include <unistd.h>
 
@@ -2139,7 +2140,7 @@ tfind_1 (enum trace_find_type type, int num,
   set_tracepoint_num (tp ? tp->number : target_tracept);
 
   if (target_frameno != get_traceframe_number ())
-    gdb::observers::traceframe_changed.notify (target_frameno, tracepoint_number);
+    interps_notify_traceframe_changed (target_frameno, tracepoint_number);
 
   set_current_traceframe (target_frameno);