From 06cd862c015ff7285816de9e36290b5b1a7b090e Mon Sep 17 00:00:00 2001
From: Pedro Alves <palves@redhat.com>
Date: Wed, 24 Feb 2010 01:06:28 +0000
Subject: [PATCH] 	* tracepoint.h (set_traceframe_number) 
 (cleanup_restore_current_traceframe): Declare. 	* tracepoint.c
 (set_traceframe_number): New. 	(struct current_traceframe_cleanup): New. 
 (do_restore_current_traceframe_cleanup) 
 (restore_current_traceframe_cleanup_dtor) 
 (make_cleanup_restore_current_traceframe): New. 	* infrun.c: Include
 tracepoint.h. 	(fetch_inferior_event): Switch out and in of tfind mode.

---
 gdb/ChangeLog    | 13 ++++++++++++
 gdb/infrun.c     | 11 ++++++++++
 gdb/tracepoint.c | 61 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 gdb/tracepoint.h |  3 +++
 4 files changed, 88 insertions(+)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2fa16f4..4a20397 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,4 +1,17 @@
 2010-02-24  Pedro Alves  <pedro@codesourcery.com>
+	    Stan Shebs  <stan@codesourcery.com>
+
+	* tracepoint.h (set_traceframe_number)
+	(cleanup_restore_current_traceframe): Declare.
+	* tracepoint.c (set_traceframe_number): New.
+	(struct current_traceframe_cleanup): New.
+	(do_restore_current_traceframe_cleanup)
+	(restore_current_traceframe_cleanup_dtor)
+	(make_cleanup_restore_current_traceframe): New.
+	* infrun.c: Include tracepoint.h.
+	(fetch_inferior_event): Switch out and in of tfind mode.
+
+2010-02-24  Pedro Alves  <pedro@codesourcery.com>
 
 	* breakpoint.c (breakpoint_init_inferior): Also delete
 	bp_shlib_event breakpoints.
diff --git a/gdb/infrun.c b/gdb/infrun.c
index a715596..9a5c3a8 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -51,6 +51,7 @@
 #include "record.h"
 #include "inline-frame.h"
 #include "jit.h"
+#include "tracepoint.h"
 
 /* Prototypes for local functions */
 
@@ -1761,6 +1762,16 @@ proceed (CORE_ADDR addr, enum target_signal siggnal, int step)
 			"infrun: proceed (addr=%s, signal=%d, step=%d)\n",
 			paddress (gdbarch, addr), siggnal, step);
 
+  /* We're handling a live event, so make sure we're doing live
+     debugging.  If we're looking at traceframes while the target is
+     running, we're going to need to get back to that mode after
+     handling the event.  */
+  if (non_stop)
+    {
+      make_cleanup_restore_current_traceframe ();
+      set_traceframe_number (-1);
+    }
+
   if (non_stop)
     /* In non-stop, each thread is handled individually.  The context
        must already be set to the right thread here.  */
diff --git a/gdb/tracepoint.c b/gdb/tracepoint.c
index f38d6c1..1d2785f 100644
--- a/gdb/tracepoint.c
+++ b/gdb/tracepoint.c
@@ -2538,6 +2538,67 @@ get_traceframe_number (void)
   return traceframe_number;
 }
 
+/* Make the traceframe NUM be the current trace frame.  Does nothing
+   if NUM is already current.  */
+
+void
+set_traceframe_number (int num)
+{
+  int newnum;
+
+  if (traceframe_number == num)
+    {
+      /* Nothing to do.  */
+      return;
+    }
+
+  newnum = target_trace_find (tfind_number, num, 0, 0, NULL);
+
+  if (newnum != num)
+    warning (_("could not change traceframe"));
+
+  traceframe_number = newnum;
+
+  /* Changing the traceframe changes our view of registers and of the
+     frame chain.  */
+  registers_changed ();
+}
+
+/* A cleanup used when switching away and back from tfind mode.  */
+
+struct current_traceframe_cleanup
+{
+  /* The traceframe we were inspecting.  */
+  int traceframe_number;
+};
+
+static void
+do_restore_current_traceframe_cleanup (void *arg)
+{
+  struct current_traceframe_cleanup *old = arg;
+
+  set_traceframe_number (old->traceframe_number);
+}
+
+static void
+restore_current_traceframe_cleanup_dtor (void *arg)
+{
+  struct current_traceframe_cleanup *old = arg;
+
+  xfree (old);
+}
+
+struct cleanup *
+make_cleanup_restore_current_traceframe (void)
+{
+  struct current_traceframe_cleanup *old;
+
+  old = xmalloc (sizeof (struct current_traceframe_cleanup));
+  old->traceframe_number = traceframe_number;
+
+  return make_cleanup_dtor (do_restore_current_traceframe_cleanup, old,
+			    restore_current_traceframe_cleanup_dtor);
+}
 
 /* Given a number and address, return an uploaded tracepoint with that
    number, creating if necessary.  */
diff --git a/gdb/tracepoint.h b/gdb/tracepoint.h
index d26c950..819a67a 100644
--- a/gdb/tracepoint.h
+++ b/gdb/tracepoint.h
@@ -140,6 +140,9 @@ extern void (*deprecated_trace_find_hook) (char *arg, int from_tty);
 extern void (*deprecated_trace_start_stop_hook) (int start, int from_tty);
 
 int get_traceframe_number (void);
+void set_traceframe_number (int);
+struct cleanup *make_cleanup_restore_current_traceframe (void);
+
 void free_actions (struct breakpoint *);
 enum actionline_type validate_actionline (char **, struct breakpoint *);
 
-- 
2.7.4