gdbserver: turn target op 'attach' into a method

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

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

	* target.h (struct process_stratum_target): Remove the target op.
	(class process_target): Add the target op.
	(myattach): Update the macro.

	Update the derived classes and callers below.

	* linux-low.cc (linux_target_ops): Update.
	(linux_attach): Turn into ...
	(linux_process_target::attach): ... this.
	* linux-low.h (class linux_process_target): Update.
	* lynx-low.cc (lynx_target_ops): Update.
	(lynx_attach): Turn into ...
	(lynx_process_target::attach): ... this.
	* lynx-low.h (class lynx_process_target): Update.
	* nto-low.cc (nto_target_ops): Update.
	(nto_attach): Turn into ...
	(nto_process_target::attach): ... this.
	* nto-low.h (class nto_process_target): Update.
	* win32-low.cc (win32_target_ops): Update.
	(win32_attach): Turn into ...
	(win32_process_target::attach): ... this.
	* win32-low.h (class win32_process_target): Update.

gdbserver/ChangeLog

@@ -1,3 +1,31 @@
+2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
+
+	Turn process_stratum_target's attach op into a method of
+	process_target.
+
+	* target.h (struct process_stratum_target): Remove the target op.
+	(class process_target): Add the target op.
+	(myattach): Update the macro.
+
+	Update the derived classes and callers below.
+
+	* linux-low.cc (linux_target_ops): Update.
+	(linux_attach): Turn into ...
+	(linux_process_target::attach): ... this.
+	* linux-low.h (class linux_process_target): Update.
+	* lynx-low.cc (lynx_target_ops): Update.
+	(lynx_attach): Turn into ...
+	(lynx_process_target::attach): ... this.
+	* lynx-low.h (class lynx_process_target): Update.
+	* nto-low.cc (nto_target_ops): Update.
+	(nto_attach): Turn into ...
+	(nto_process_target::attach): ... this.
+	* nto-low.h (class nto_process_target): Update.
+	* win32-low.cc (win32_target_ops): Update.
+	(win32_attach): Turn into ...
+	(win32_process_target::attach): ... this.
+	* win32-low.h (class win32_process_target): Update.
+
 2020-02-20  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
 
 	Turn process_stratum_target's post_create_inferior op into a method

gdbserver/linux-low.cc

@@ -1181,8 +1181,8 @@ static void async_file_mark (void);
 /* Attach to PID.  If PID is the tgid, attach to it and all
    of its threads.  */
 
-static int
+int
-linux_attach (unsigned long pid)
+linux_process_target::attach (unsigned long pid)
 {
   struct process_info *proc;
   struct thread_info *initial_thread;
@@ -7359,7 +7359,6 @@ linux_get_hwcap2 (int wordsize)
 static linux_process_target the_linux_target;
 
 static process_stratum_target linux_target_ops = {
-  linux_attach,
   linux_kill,
   linux_detach,
   linux_mourn,

gdbserver/linux-low.h

@@ -274,6 +274,8 @@ public:
 		       const std::vector<char *> &program_args) override;
 
   void post_create_inferior () override;
+
+  int attach (unsigned long pid) override;
 };
 
 #define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))

gdbserver/lynx-low.cc

@@ -309,8 +309,8 @@ lynx_add_threads_after_attach (int pid)
 
 /* Implement the attach target_ops method.  */
 
-static int
+int
-lynx_attach (unsigned long pid)
+lynx_process_target::attach (unsigned long pid)
 {
   ptid_t ptid = lynx_ptid_t (pid, 0);
 
@@ -726,7 +726,6 @@ static lynx_process_target the_lynx_target;
 /* The LynxOS target_ops vector.  */
 
 static process_stratum_target lynx_target_ops = {
-  lynx_attach,
   lynx_kill,
   lynx_detach,
   lynx_mourn,

gdbserver/lynx-low.h

@@ -60,6 +60,8 @@ public:
 
   int create_inferior (const char *program,
 		       const std::vector<char *> &program_args) override;
+
+  int attach (unsigned long pid) override;
 };
 
 /* The inferior's target description.  This is a global because the

gdbserver/nto-low.cc

@@ -385,8 +385,8 @@ nto_process_target::create_inferior (const char *program,
 
 /* Attach to process PID.  */
 
-static int
+int
-nto_attach (unsigned long pid)
+nto_process_target::attach (unsigned long pid)
 {
   TRACE ("%s %ld\n", __func__, pid);
   if (do_attach (pid) != pid)
@@ -935,7 +935,6 @@ nto_sw_breakpoint_from_kind (int kind, int *size)
 static nto_process_target the_nto_target;
 
 static process_stratum_target nto_target_ops = {
-  nto_attach,
   nto_kill,
   nto_detach,
   nto_mourn,

gdbserver/nto-low.h

@@ -50,6 +50,8 @@ public:
 
   int create_inferior (const char *program,
 		       const std::vector<char *> &program_args) override;
+
+  int attach (unsigned long pid) override;
 };
 
 /* The inferior's target description.  This is a global because the

gdbserver/target.h

@@ -70,16 +70,6 @@ class process_target;
    shared code.  */
 struct process_stratum_target
 {
-  /* Attach to a running process.
-
-     PID is the process ID to attach to, specified by the user
-     or a higher layer.
-
-     Returns -1 if attaching is unsupported, 0 on success, and calls
-     error() otherwise.  */
-
-  int (*attach) (unsigned long pid);
-
   /* Kill process PROC.  Return -1 on failure, and 0 on success.  */
 
   int (*kill) (process_info *proc);
@@ -489,6 +479,15 @@ public:
   /* Do additional setup after a new process is created, including
      exec-wrapper completion.  */
   virtual void post_create_inferior ();
+
+  /* Attach to a running process.
+
+     PID is the process ID to attach to, specified by the user
+     or a higher layer.
+
+     Returns -1 if attaching is unsupported, 0 on success, and calls
+     error() otherwise.  */
+  virtual int attach (unsigned long pid) = 0;
 };
 
 extern process_stratum_target *the_target;
@@ -502,7 +501,7 @@ void set_target_ops (process_stratum_target *);
   the_target->pt->post_create_inferior ()
 
 #define myattach(pid) \
-  (*the_target->attach) (pid)
+  the_target->pt->attach (pid)
 
 int kill_inferior (process_info *proc);
 

gdbserver/win32-low.cc

@@ -726,8 +726,8 @@ win32_process_target::create_inferior (const char *program,
 /* Attach to a running process.
    PID is the process ID to attach to, specified by the user
    or a higher layer.  */
-static int
+int
-win32_attach (unsigned long pid)
+win32_process_target::attach (unsigned long pid)
 {
   HANDLE h;
   winapi_DebugSetProcessKillOnExit DebugSetProcessKillOnExit = NULL;
@@ -1839,7 +1839,6 @@ win32_sw_breakpoint_from_kind (int kind, int *size)
 static win32_process_target the_win32_target;
 
 static process_stratum_target win32_target_ops = {
-  win32_attach,
   win32_kill,
   win32_detach,
   win32_mourn,

gdbserver/win32-low.h

@@ -109,6 +109,8 @@ public:
 
   int create_inferior (const char *program,
 		       const std::vector<char *> &program_args) override;
+
+  int attach (unsigned long pid) override;
 };
 
 /* Retrieve the context for this thread, if not already retrieved.  */