gdbserver: turn prepare_to_access_memory & done_accessing_memory into methods

gdbserver/ChangeLog:
2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Turn process_stratum_target's prepare_to_access_memory and
	done_accessing_memory ops into methods of process_target.

	* target.h (struct process_stratum_target): Remove the target ops.
	(class process_target): Add the target ops.
	* target.cc (process_target::prepare_to_access_memory): Define.
	(process_target::done_accessing_memory): Define.
	(prepare_to_access_memory): Update.
	(done_accessing_memory): Update.

	Update the derived classes and callers below.

	* linux-low.cc (linux_target_ops): Update.
	(linux_prepare_to_access_memory): Turn into ...
	(linux_process_target::prepare_to_access_memory): ... this.
	(linux_done_accessing_memory): Turn into ...
	(linux_process_target::done_accessing_memory): ... this.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.cc (lynx_target_ops): Update.
	* nto-low.cc (nto_target_ops): Update.
	* win32-low.cc (win32_target_ops): Update.

1 files changed, 16 insertions, 10 deletions

diff --git a/gdbserver/target.cc b/gdbserver/target.cc
index b73c446..f88e9fa 100644
--- a/gdbserver/target.cc
+++ b/gdbserver/target.cc
@@ -57,14 +57,9 @@ prepare_to_access_memory (void)
      it.  */
   prev_general_thread = cs.general_thread;
 
-  if (the_target->prepare_to_access_memory != NULL)
-    {
-      int res;
-
-      res = the_target->prepare_to_access_memory ();
-      if (res != 0)
-	return res;
-    }
+  int res = the_target->pt->prepare_to_access_memory ();
+  if (res != 0)
+    return res;
 
   for_each_thread (prev_general_thread.pid (), [&] (thread_info *thread)
     {
@@ -114,8 +109,7 @@ done_accessing_memory (void)
 {
   client_state &cs = get_client_state ();
 
-  if (the_target->done_accessing_memory != NULL)
-    the_target->done_accessing_memory ();
+  the_target->pt->done_accessing_memory ();
 
   /* Restore the previous selected thread.  */
   cs.general_thread = prev_general_thread;
@@ -402,3 +396,15 @@ process_target::post_create_inferior ()
 {
   /* Nop.  */
 }
+
+int
+process_target::prepare_to_access_memory ()
+{
+  return 0;
+}
+
+void
+process_target::done_accessing_memory ()
+{
+  /* Nop.  */
+}