[PATCH 29/58] gdbserver: turn non-stop and async target ops into methods

[Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>]

gdbserver/ChangeLog:
2020-02-10  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>

	Make process_stratum_target's supports_non_stop, async, and
	start_non_stop ops methods of process_target.

	* target.h (struct process_stratum_target): Remove the target ops.
	(class process_target): Add the target ops.
	(target_supports_non_stop): Update the macro.
	(target_async): Update the macro.
	(start_non_stop): Remove declaration.
	* target.c (process_target::supports_non_stop): Define.
	(process_target::async): Define.
	(process_target::start_non_stop): Define.
	(start_non_stop): Remove.

	Update the derived structs and callers below.

	* server.c (handle_qxfer_siginfo): Update.
	(handle_query): Update.
	* linux-low.c (linux_target_ops): Update.
	(linux_supports_non_stop): Turn into ...
	(linux_process_target::supports_non_stop): ... this.
	(linux_async): Turn into ...
	(linux_process_target::async): ... this.
	(linux_start_non_stop): Turn into ...
	(linux_process_target::start_non_stop): ... this.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.c (lynx_target_ops): Update.
	* nto-low.c (nto_target_ops): Update.
	(nto_supports_non_stop): Remove; rely on the default behavior
	instead.
	* win32-low.c (win32_target_ops): Update.
---
 gdbserver/linux-low.c | 23 ++++++++++-------------
 gdbserver/linux-low.h |  6 ++++++
 gdbserver/lynx-low.c  |  3 ---
 gdbserver/nto-low.c   | 12 ------------
 gdbserver/server.c    |  6 +++---
 gdbserver/target.c    | 35 +++++++++++++++++++++--------------
 gdbserver/target.h    | 29 +++++++++++++----------------
 gdbserver/win32-low.c |  3 ---
 8 files changed, 53 insertions(+), 64 deletions(-)

diff --git a/gdbserver/linux-low.c b/gdbserver/linux-low.c
index 387e160b8de..a13edfd067b 100644
--- a/gdbserver/linux-low.c
+++ b/gdbserver/linux-low.c
@@ -6254,16 +6254,16 @@ sigchld_handler (int signo)
   errno = old_errno;
 }
 
-static int
-linux_supports_non_stop (void)
+bool
+linux_process_target::supports_non_stop ()
 {
-  return 1;
+  return true;
 }
 
-static int
-linux_async (int enable)
+bool
+linux_process_target::async (bool enable)
 {
-  int previous = target_is_async_p ();
+  bool previous = target_is_async_p ();
 
   if (debug_threads)
     debug_printf ("linux_async (%d), previous=%d\n",
@@ -6315,13 +6315,13 @@ linux_async (int enable)
   return previous;
 }
 
-static int
-linux_start_non_stop (int nonstop)
+int
+linux_process_target::start_non_stop (bool nonstop)
 {
   /* Register or unregister from event-loop accordingly.  */
-  linux_async (nonstop);
+  target_async (nonstop);
 
-  if (target_is_async_p () != (nonstop != 0))
+  if (target_is_async_p () != (nonstop != false))
     return -1;
 
   return 0;
@@ -7418,9 +7418,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_supports_non_stop,
-  linux_async,
-  linux_start_non_stop,
   linux_supports_multi_process,
   linux_supports_fork_events,
   linux_supports_vfork_events,
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index a008dac66f4..0f1dfa45fba 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -360,6 +360,12 @@ public:
   int qxfer_siginfo (const char *annex, unsigned char *readbuf,
 		     unsigned const char *writebuf,
 		     CORE_ADDR offset, int len) override;
+
+  bool supports_non_stop () override;
+
+  bool async (bool enable) override;
+
+  int start_non_stop (bool enable) override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
diff --git a/gdbserver/lynx-low.c b/gdbserver/lynx-low.c
index d45e598cb26..ad2c2f72a73 100644
--- a/gdbserver/lynx-low.c
+++ b/gdbserver/lynx-low.c
@@ -735,9 +735,6 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* supports_non_stop */
-  NULL,  /* async */
-  NULL,  /* start_non_stop */
   NULL,  /* supports_multi_process */
   NULL,  /* supports_fork_events */
   NULL,  /* supports_vfork_events */
diff --git a/gdbserver/nto-low.c b/gdbserver/nto-low.c
index 4d3ef38a976..cbbf67af917 100644
--- a/gdbserver/nto-low.c
+++ b/gdbserver/nto-low.c
@@ -933,15 +933,6 @@ nto_process_target::stopped_data_address ()
   return ret;
 }
 
-/* We do not currently support non-stop.  */
-
-static int
-nto_supports_non_stop (void)
-{
-  TRACE ("%s\n", __func__);
-  return 0;
-}
-
 /* Implementation of the target_ops method "sw_breakpoint_from_kind".  */
 
 static const gdb_byte *
@@ -956,9 +947,6 @@ nto_sw_breakpoint_from_kind (int kind, int *size)
 static nto_process_target the_nto_target;
 
 static process_stratum_target nto_target_ops = {
-  nto_supports_non_stop,
-  NULL, /* async */
-  NULL, /* start_non_stop */
   NULL, /* supports_multi_process */
   NULL, /* supports_fork_events */
   NULL, /* supports_vfork_events */
diff --git a/gdbserver/server.c b/gdbserver/server.c
index ece75f01868..f427e7706fb 100644
--- a/gdbserver/server.c
+++ b/gdbserver/server.c
@@ -740,7 +740,7 @@ handle_general_set (char *own_buf)
 	}
 
       req_str = req ? "non-stop" : "all-stop";
-      if (start_non_stop (req) != 0)
+      if (the_target->pt->start_non_stop (req == 1) != 0)
 	{
 	  fprintf (stderr, "Setting %s mode failed\n", req_str);
 	  write_enn (own_buf);
@@ -1234,7 +1234,7 @@ handle_detach (char *own_buf)
 	    debug_printf ("Forcing non-stop mode\n");
 
 	  non_stop = true;
-	  start_non_stop (1);
+	  the_target->pt->start_non_stop (true);
 	}
 
       process->gdb_detached = 1;
@@ -3885,7 +3885,7 @@ captured_main (int argc, char *argv[])
 		     down without informing GDB.  */
 		  if (!non_stop)
 		    {
-		      if (start_non_stop (1))
+		      if (the_target->pt->start_non_stop (true))
 			non_stop = 1;
 
 		      /* Detaching implicitly resumes all threads;
diff --git a/gdbserver/target.c b/gdbserver/target.c
index 94bb45fcace..33e31a748ef 100644
--- a/gdbserver/target.c
+++ b/gdbserver/target.c
@@ -264,20 +264,6 @@ target_supports_multi_process (void)
 	  (*the_target->supports_multi_process) () : 0);
 }
 
-int
-start_non_stop (int nonstop)
-{
-  if (the_target->start_non_stop == NULL)
-    {
-      if (nonstop)
-	return -1;
-      else
-	return 0;
-    }
-
-  return (*the_target->start_non_stop) (nonstop);
-}
-
 void
 set_target_ops (process_stratum_target *target)
 {
@@ -541,3 +527,24 @@ process_target::qxfer_siginfo (const char *annex, unsigned char *readbuf,
 {
   gdb_assert_not_reached ("target op qxfer_siginfo not supported");
 }
+
+bool
+process_target::supports_non_stop ()
+{
+  return false;
+}
+
+bool
+process_target::async (bool enable)
+{
+  return false;
+}
+
+int
+process_target::start_non_stop (bool enable)
+{
+  if (enable)
+    return -1;
+  else
+    return 0;
+}
diff --git a/gdbserver/target.h b/gdbserver/target.h
index bec147de089..88b4762a30c 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,16 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  int (*supports_non_stop) (void);
-
-  /* Enables async target events.  Returns the previous enable
-     state.  */
-  int (*async) (int enable);
-
-  /* Switch to non-stop (1) or all-stop (0) mode.  Return 0 on
-     success, -1 otherwise.  */
-  int (*start_non_stop) (int);
-
   /* Returns true if the target supports multi-process debugging.  */
   int (*supports_multi_process) (void);
 
@@ -485,6 +475,17 @@ public:
   virtual int qxfer_siginfo (const char *annex, unsigned char *readbuf,
 			     unsigned const char *writebuf,
 			     CORE_ADDR offset, int len);
+
+  /* Return true if non-stop mode is supported.  */
+  virtual bool supports_non_stop ();
+
+  /* Enables async target events.  Returns the previous enable
+     state.  */
+  virtual bool async (bool enable);
+
+  /* Switch to non-stop (ENABLE == true) or all-stop (ENABLE == false)
+     mode.  Return 0 on success, -1 otherwise.  */
+  virtual int start_non_stop (bool enable);
 };
 
 extern process_stratum_target *the_target;
@@ -537,10 +538,10 @@ int kill_inferior (process_info *proc);
   the_target->pt->join (pid)
 
 #define target_supports_non_stop() \
-  (the_target->supports_non_stop ? (*the_target->supports_non_stop ) () : 0)
+  the_target->pt->supports_non_stop ()
 
 #define target_async(enable) \
-  (the_target->async ? (*the_target->async) (enable) : 0)
+  the_target->pt->async (enable)
 
 #define target_process_qsupported(features, count)	\
   do							\
@@ -696,10 +697,6 @@ target_read_btrace_conf (struct btrace_target_info *tinfo,
   (the_target->supports_software_single_step ? \
    (*the_target->supports_software_single_step) () : 0)
 
-/* Start non-stop mode, returns 0 on success, -1 on failure.   */
-
-int start_non_stop (int nonstop);
-
 ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 	       int connected_wait);
 
diff --git a/gdbserver/win32-low.c b/gdbserver/win32-low.c
index 45fd49458e7..15431047814 100644
--- a/gdbserver/win32-low.c
+++ b/gdbserver/win32-low.c
@@ -1842,9 +1842,6 @@ win32_sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  NULL, /* supports_non_stop */
-  NULL, /* async */
-  NULL, /* start_non_stop */
   NULL, /* supports_multi_process */
   NULL, /* supports_fork_events */
   NULL, /* supports_vfork_events */
-- 
2.17.1