gdbserver: turn target op 'supports_software_single_step' into a method

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

	Turn process_stratum_target's supports_software_single_step 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_supports_software_single_step): Update the macro.
	* target.cc (process_target::supports_software_single_step): Define.

	Update the derived classes and callers below.

	* linux-low.cc (linux_target_ops): Update.
	(linux_supports_software_single_step): Turn into ...
	(linux_process_target::supports_software_single_step): ... 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, 34 insertions, 11 deletions

diff --git a/gdbserver/ChangeLog b/gdbserver/ChangeLog
index 592697a..5d4cd33 100644
--- a/gdbserver/ChangeLog
+++ b/gdbserver/ChangeLog
@@ -1,5 +1,25 @@
 2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
 
+	Turn process_stratum_target's supports_software_single_step 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_supports_software_single_step): Update the macro.
+	* target.cc (process_target::supports_software_single_step): Define.
+
+	Update the derived classes and callers below.
+
+	* linux-low.cc (linux_target_ops): Update.
+	(linux_supports_software_single_step): Turn into ...
+	(linux_process_target::supports_software_single_step): ... 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 thread_name and thread_handle ops
 	into methods of process_target.
 
diff --git a/gdbserver/linux-low.cc b/gdbserver/linux-low.cc
index f910866..1624ea4 100644
--- a/gdbserver/linux-low.cc
+++ b/gdbserver/linux-low.cc
@@ -6044,8 +6044,8 @@ linux_process_target::supports_hardware_single_step ()
   return can_hardware_single_step ();
 }
 
-static int
-linux_supports_software_single_step (void)
+bool
+linux_process_target::supports_software_single_step ()
 {
   return can_software_single_step ();
 }
@@ -7524,7 +7524,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_supports_software_single_step,
   linux_supports_catch_syscall,
   linux_get_ipa_tdesc_idx,
   &the_linux_target,
diff --git a/gdbserver/linux-low.h b/gdbserver/linux-low.h
index 2acd65f..1595926 100644
--- a/gdbserver/linux-low.h
+++ b/gdbserver/linux-low.h
@@ -475,6 +475,8 @@ public:
   bool thread_handle (ptid_t ptid, gdb_byte **handle,
 		      int *handle_len) override;
 #endif
+
+  bool supports_software_single_step () 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 0c460be..399ccae 100644
--- a/gdbserver/lynx-low.cc
+++ b/gdbserver/lynx-low.cc
@@ -741,7 +741,6 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  NULL,  /* supports_software_single_step */
   NULL,  /* supports_catch_syscall */
   NULL,  /* get_ipa_tdesc_idx */
   &the_lynx_target,
diff --git a/gdbserver/nto-low.cc b/gdbserver/nto-low.cc
index 4c3c5a3..a502135 100644
--- a/gdbserver/nto-low.cc
+++ b/gdbserver/nto-low.cc
@@ -947,7 +947,6 @@ nto_process_target::sw_breakpoint_from_kind (int kind, int *size)
 static nto_process_target the_nto_target;
 
 static process_stratum_target nto_target_ops = {
-  NULL, /* supports_software_single_step */
   NULL, /* supports_catch_syscall */
   NULL, /* get_ipa_tdesc_idx */
   &the_nto_target,
diff --git a/gdbserver/target.cc b/gdbserver/target.cc
index b7ed26b..b1a28e6 100644
--- a/gdbserver/target.cc
+++ b/gdbserver/target.cc
@@ -814,3 +814,9 @@ process_target::thread_handle (ptid_t ptid, gdb_byte **handle,
 {
   return false;
 }
+
+bool
+process_target::supports_software_single_step ()
+{
+  return false;
+}
diff --git a/gdbserver/target.h b/gdbserver/target.h
index 4d9de55..26ce137 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,9 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Returns true if the target can software single step.  */
-  int (*supports_software_single_step) (void);
-
   /* Return 1 if the target supports catch syscall, 0 (or leave the
      callback NULL) otherwise.  */
   int (*supports_catch_syscall) (void);
@@ -505,6 +502,9 @@ public:
      and the handle's length via HANDLE_LEN.  */
   virtual bool thread_handle (ptid_t ptid, gdb_byte **handle,
 			      int *handle_len);
+
+  /* Returns true if the target can software single step.  */
+  virtual bool supports_software_single_step ();
 };
 
 extern process_stratum_target *the_target;
@@ -669,8 +669,7 @@ target_read_btrace_conf (struct btrace_target_info *tinfo,
   the_target->pt->breakpoint_kind_from_current_state (pcptr)
 
 #define target_supports_software_single_step() \
-  (the_target->supports_software_single_step ? \
-   (*the_target->supports_software_single_step) () : 0)
+  the_target->pt->supports_software_single_step ()
 
 ptid_t mywait (ptid_t ptid, struct target_waitstatus *ourstatus, int options,
 	       int connected_wait);
diff --git a/gdbserver/win32-low.cc b/gdbserver/win32-low.cc
index 218f007..b218ff5 100644
--- a/gdbserver/win32-low.cc
+++ b/gdbserver/win32-low.cc
@@ -1858,7 +1858,6 @@ win32_process_target::sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  NULL, /* supports_software_single_step */
   NULL, /* supports_catch_syscall */
   NULL, /* get_ipa_tdesc_idx */
   &the_win32_target,