gdbserver: turn target op 'pid_to_exec_file' into a method

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

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

	* target.h (struct process_stratum_target): Remove the target op.
	(class process_target): Add the target op.  Also add
	'supports_pid_to_exec_file'.
	* target.cc (process_target::pid_to_exec_file): Define.
	(process_target::supports_pid_to_exec_file): Define.

	Update the derived classes and callers below.

	* server.cc (handle_qxfer_exec_file): Update.
	(handle_query): Update.
	* linux-low.cc (linux_target_ops): Update.
	(linux_process_target::supports_pid_to_exec_file): Define.
	(linux_process_target::pid_to_exec_file): Define.
	* 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, 11 insertions, 8 deletions

diff --git a/gdbserver/target.h b/gdbserver/target.h
index cdb3c119433..d728646d274 100644
--- a/gdbserver/target.h
+++ b/gdbserver/target.h
@@ -70,14 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Return the full absolute name of the executable file that was
-     run to create the process PID.  If the executable file cannot
-     be determined, NULL is returned.  Otherwise, a pointer to a
-     character string containing the pathname is returned.  This
-     string should be copied into a buffer by the client if the string
-     will not be immediately used, or if it must persist.  */
-  char *(*pid_to_exec_file) (int pid);
-
   /* Multiple-filesystem-aware open.  Like open(2), but operating in
      the filesystem as it appears to process PID.  Systems where all
      processes share a common filesystem should set this to NULL.
@@ -498,6 +490,17 @@ public:
 
   /* Return true if target supports range stepping.  */
   virtual bool supports_range_stepping ();
+
+  /* Return true if the pid_to_exec_file op is supported.  */
+  virtual bool supports_pid_to_exec_file ();
+
+  /* Return the full absolute name of the executable file that was
+     run to create the process PID.  If the executable file cannot
+     be determined, NULL is returned.  Otherwise, a pointer to a
+     character string containing the pathname is returned.  This
+     string should be copied into a buffer by the client if the string
+     will not be immediately used, or if it must persist.  */
+  virtual char *pid_to_exec_file (int pid);
 };
 
 extern process_stratum_target *the_target;