gdbserver: turn target op 'supports_multi_process' into a method

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

	Turn process_stratum_target's supports_multi_process op into a
	method of process_target.

	* target.h (struct process_stratum_target): Remove the target op.
	(class process_target): Add the target op.
	* target.cc (process_target::supports_multi_process): Define.
	(target_supports_multi_process): Update.

	Update the derived classes and callers below.

	* linux-low.cc (linux_target_ops): Update.
	(linux_supports_multi_process): Turn into ...
	(linux_process_target::supports_multi_process): ... 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.

gdbserver/ChangeLog

@@ -1,3 +1,23 @@
+2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
+
+	Turn process_stratum_target's supports_multi_process op into a
+	method of process_target.
+
+	* target.h (struct process_stratum_target): Remove the target op.
+	(class process_target): Add the target op.
+	* target.cc (process_target::supports_multi_process): Define.
+	(target_supports_multi_process): Update.
+
+	Update the derived classes and callers below.
+
+	* linux-low.cc (linux_target_ops): Update.
+	(linux_supports_multi_process): Turn into ...
+	(linux_process_target::supports_multi_process): ... 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 supports_non_stop, async, and

gdbserver/linux-low.cc

@@ -6338,10 +6338,10 @@ linux_process_target::start_non_stop (bool nonstop)
   return 0;
 }
 
-static int
+bool
-linux_supports_multi_process (void)
+linux_process_target::supports_multi_process ()
 {
-  return 1;
+  return true;
 }
 
 /* Check if fork events are supported.  */
@@ -7429,7 +7429,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_supports_multi_process,
   linux_supports_fork_events,
   linux_supports_vfork_events,
   linux_supports_exec_events,

gdbserver/linux-low.h

@@ -363,6 +363,8 @@ public:
   bool async (bool enable) override;
 
   int start_non_stop (bool enable) override;
+
+  bool supports_multi_process () override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))

gdbserver/lynx-low.cc

@@ -735,7 +735,6 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* supports_multi_process */
   NULL,  /* supports_fork_events */
   NULL,  /* supports_vfork_events */
   NULL,  /* supports_exec_events */

gdbserver/nto-low.cc

@@ -947,7 +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 = {
-  NULL, /* supports_multi_process */
   NULL, /* supports_fork_events */
   NULL, /* supports_vfork_events */
   NULL, /* supports_exec_events */

gdbserver/target.cc

@@ -260,8 +260,7 @@ target_continue (ptid_t ptid, enum gdb_signal signal)
 int
 target_supports_multi_process (void)
 {
-  return (the_target->supports_multi_process != NULL ?
+  return the_target->pt->supports_multi_process ();
-	  (*the_target->supports_multi_process) () : 0);
 }
 
 void
@@ -548,3 +547,9 @@ process_target::start_non_stop (bool enable)
   else
     return 0;
 }
+
+bool
+process_target::supports_multi_process ()
+{
+  return false;
+}

gdbserver/target.h

@@ -70,9 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Returns true if the target supports multi-process debugging.  */
-  int (*supports_multi_process) (void);
-
   /* Returns true if fork events are supported.  */
   int (*supports_fork_events) (void);
 
@@ -486,6 +483,9 @@ public:
   /* 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);
+
+  /* Returns true if the target supports multi-process debugging.  */
+  virtual bool supports_multi_process ();
 };
 
 extern process_stratum_target *the_target;

gdbserver/win32-low.cc

@@ -1852,7 +1852,6 @@ 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_multi_process */
   NULL, /* supports_fork_events */
   NULL, /* supports_vfork_events */
   NULL, /* supports_exec_events */