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.

8 files changed, 63 insertions, 39 deletions

diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog
index 73adc65..d41539b 100644
--- a/gdbserver/ChangeLog
+++ b/gdbserver/ChangeLog
@@ -1,5 +1,29 @@
 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.
+
+2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
+
 	Turn process_stratum_target's fetch_registers and store_registers
 	ops into methods of process_target.
 
diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index 7cf7d90..6f408ad 100644
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -6505,8 +6505,8 @@ linux_unpause_all (int unfreeze)
   unstop_all_lwps (unfreeze, NULL);
 }
 
-static int
-linux_prepare_to_access_memory (void)
+int
+linux_process_target::prepare_to_access_memory ()
 {
   /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
      running LWP.  */
@@ -6515,8 +6515,8 @@ linux_prepare_to_access_memory (void)
   return 0;
 }
 
-static void
-linux_done_accessing_memory (void)
+void
+linux_process_target::done_accessing_memory ()
 {
   /* Neither ptrace nor /proc/PID/mem allow accessing memory through a
      running LWP.  */
@@ -7359,8 +7359,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_prepare_to_access_memory,
-  linux_done_accessing_memory,
   linux_read_memory,
   linux_write_memory,
   linux_look_up_symbols,
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index 85b5c8a..2b7b357 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -295,6 +295,10 @@ public:
   void fetch_registers (regcache *regcache, int regno) override;
 
   void store_registers (regcache *regcache, int regno) override;
+
+  int prepare_to_access_memory () override;
+
+  void done_accessing_memory () override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
diff --git a/gdbserver/lynx-low.cc b/gdbserver/lynx-low.cc
index 5c46567f..e243764 100644
--- a/gdbserver/lynx-low.cc
+++ b/gdbserver/lynx-low.cc
@@ -727,8 +727,6 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* prepare_to_access_memory */
-  NULL,  /* done_accessing_memory */
   lynx_read_memory,
   lynx_write_memory,
   NULL,  /* look_up_symbols */
diff --git a/gdbserver/nto-low.cc b/gdbserver/nto-low.cc
index a051f36..36bd40c 100644
--- a/gdbserver/nto-low.cc
+++ b/gdbserver/nto-low.cc
@@ -941,8 +941,6 @@ nto_sw_breakpoint_from_kind (int kind, int *size)
 static nto_process_target the_nto_target;
 
 static process_stratum_target nto_target_ops = {
-  NULL, /* prepare_to_access_memory */
-  NULL, /* done_accessing_memory */
   nto_read_memory,
   nto_write_memory,
   NULL, /* nto_look_up_symbols */
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.  */
+}
diff --git a/gdbserver/target.h b/gdbserver/target.h
index e42c750..e89ddbb 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,23 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Prepare to read or write memory from the inferior process.
-     Targets use this to do what is necessary to get the state of the
-     inferior such that it is possible to access memory.
-
-     This should generally only be called from client facing routines,
-     such as gdb_read_memory/gdb_write_memory, or the GDB breakpoint
-     insertion routine.
-
-     Like `read_memory' and `write_memory' below, returns 0 on success
-     and errno on failure.  */
-
-  int (*prepare_to_access_memory) (void);
-
-  /* Undo the effects of prepare_to_access_memory.  */
-
-  void (*done_accessing_memory) (void);
-
   /* Read memory from the inferior process.  This should generally be
      called through read_inferior_memory, which handles breakpoint shadowing.
 
@@ -480,6 +463,21 @@ public:
 
      If REGNO is -1, store all registers; otherwise, store at least REGNO.  */
   virtual void store_registers (regcache *regcache, int regno) = 0;
+
+  /* Prepare to read or write memory from the inferior process.
+     Targets use this to do what is necessary to get the state of the
+     inferior such that it is possible to access memory.
+
+     This should generally only be called from client facing routines,
+     such as gdb_read_memory/gdb_write_memory, or the GDB breakpoint
+     insertion routine.
+
+     Like `read_memory' and `write_memory' below, returns 0 on success
+     and errno on failure.  */
+  virtual int prepare_to_access_memory ();
+
+  /* Undo the effects of prepare_to_access_memory.  */
+  virtual void done_accessing_memory ();
 };
 
 extern process_stratum_target *the_target;
diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc
index 9e4e4c3..4a8e64d 100644
--- a/gdbserver/win32-low.cc
+++ b/gdbserver/win32-low.cc
@@ -1837,8 +1837,6 @@ win32_sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  NULL, /* prepare_to_access_memory */
-  NULL, /* done_accessing_memory */
   win32_read_inferior_memory,
   win32_write_inferior_memory,
   NULL, /* lookup_symbols */