Remove release_stop_context_cleanup

This removes release_stop_context_cleanup, replacing it with a
stop_context destructor.  It also mildly c++-ifies this struct.

gdb/ChangeLog
2018-09-17  Tom Tromey  <tom@tromey.com>

	* infrun.c (struct stop_context): Declare constructor,
	destructor, "changed" method.
	(stop_context::stop_context): Rename from save_stop_context.
	(stop_context::~stop_context): Rename from
	release_stop_context_cleanup.
	(normal_stop): Update.
	(stop_context::changed): Rename from stop_context_changed.  Return
	bool.

2 files changed, 44 insertions, 41 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 3c5ebb5..cfb3e7b 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,16 @@
 2018-09-17  Tom Tromey  <tom@tromey.com>
 
+	* infrun.c (struct stop_context): Declare constructor,
+	destructor, "changed" method.
+	(stop_context::stop_context): Rename from save_stop_context.
+	(stop_context::~stop_context): Rename from
+	release_stop_context_cleanup.
+	(normal_stop): Update.
+	(stop_context::changed): Rename from stop_context_changed.  Return
+	bool.
+
+2018-09-17  Tom Tromey  <tom@tromey.com>
+
 	* inferior.h (struct infcall_suspend_state_deleter): New.
 	(infcall_suspend_state_up): New typedef.
 	(struct infcall_control_state_deleter): New.
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 4828720..3c3bb96 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -8095,6 +8095,13 @@ maybe_remove_breakpoints (void)
 
 struct stop_context
 {
+  stop_context ();
+  ~stop_context ();
+
+  DISABLE_COPY_AND_ASSIGN (stop_context);
+
+  bool changed () const;
+
   /* The stop ID.  */
   ULONGEST stop_id;
 
@@ -8110,59 +8117,50 @@ struct stop_context
   int inf_num;
 };
 
-/* Returns a new stop context.  If stopped for a thread event, this
+/* Initializes a new stop context.  If stopped for a thread event, this
    takes a strong reference to the thread.  */
 
-static struct stop_context *
-save_stop_context (void)
+stop_context::stop_context ()
 {
-  struct stop_context *sc = XNEW (struct stop_context);
-
-  sc->stop_id = get_stop_id ();
-  sc->ptid = inferior_ptid;
-  sc->inf_num = current_inferior ()->num;
+  stop_id = get_stop_id ();
+  ptid = inferior_ptid;
+  inf_num = current_inferior ()->num;
 
   if (inferior_ptid != null_ptid)
     {
       /* Take a strong reference so that the thread can't be deleted
 	 yet.  */
-      sc->thread = inferior_thread ();
-      sc->thread->incref ();
+      thread = inferior_thread ();
+      thread->incref ();
     }
   else
-    sc->thread = NULL;
-
-  return sc;
+    thread = NULL;
 }
 
 /* Release a stop context previously created with save_stop_context.
    Releases the strong reference to the thread as well. */
 
-static void
-release_stop_context_cleanup (void *arg)
+stop_context::~stop_context ()
 {
-  struct stop_context *sc = (struct stop_context *) arg;
-
-  if (sc->thread != NULL)
-    sc->thread->decref ();
-  xfree (sc);
+  if (thread != NULL)
+    thread->decref ();
 }
 
 /* Return true if the current context no longer matches the saved stop
    context.  */
 
-static int
-stop_context_changed (struct stop_context *prev)
-{
-  if (prev->ptid != inferior_ptid)
-    return 1;
-  if (prev->inf_num != current_inferior ()->num)
-    return 1;
-  if (prev->thread != NULL && prev->thread->state != THREAD_STOPPED)
-    return 1;
-  if (get_stop_id () != prev->stop_id)
-    return 1;
-  return 0;
+bool
+stop_context::changed () const
+{
+  if (ptid != inferior_ptid)
+    return true;
+  if (inf_num != current_inferior ()->num)
+    return true;
+  if (thread != NULL && thread->state != THREAD_STOPPED)
+    return true;
+  if (get_stop_id () != stop_id)
+    return true;
+  return false;
 }
 
 /* See infrun.h.  */
@@ -8305,9 +8303,7 @@ normal_stop (void)
      of stop_command's pre-hook not existing).  */
   if (stop_command != NULL)
     {
-      struct stop_context *saved_context = save_stop_context ();
-      struct cleanup *old_chain
-	= make_cleanup (release_stop_context_cleanup, saved_context);
+      stop_context saved_context;
 
       TRY
 	{
@@ -8325,12 +8321,8 @@ normal_stop (void)
 	 gone.  Likewise if the command switches thread or inferior --
 	 the observers would print a stop for the wrong
 	 thread/inferior.  */
-      if (stop_context_changed (saved_context))
-	{
-	  do_cleanups (old_chain);
-	  return 1;
-	}
-      do_cleanups (old_chain);
+      if (saved_context.changed ())
+	return 1;
     }
 
   /* Notify observers about the stop.  This is where the interpreters