gdbserver: turn target op 'read_offsets' into a method

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

	Turn process_stratum_target's read_offsets 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_read_offsets'.
	* target.cc (process_target::read_offsets): Define.
	(process_target::supports_read_offsets): Define.

	Update the derived classes and callers below.

	* server.cc (handle_query): Update.
	* linux-low.cc (SUPPORTS_READ_OFFSETS): New #define directive.
	(linux_target_ops): Update.
	(linux_process_target::supports_read_offsets): Define.
	(linux_read_offsets): Turn into ...
	(linux_process_target::read_offsets): ... 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.

1 files changed, 12 insertions, 0 deletions

diff --git a/gdbserver/target.cc b/gdbserver/target.cc
index 00f5f79..501a8d6 100644
--- a/gdbserver/target.cc
+++ b/gdbserver/target.cc
@@ -481,3 +481,15 @@ process_target::stopped_data_address ()
 {
   return 0;
 }
+
+bool
+process_target::supports_read_offsets ()
+{
+  return false;
+}
+
+int
+process_target::read_offsets (CORE_ADDR *text, CORE_ADDR *data)
+{
+  gdb_assert_not_reached ("target op read_offsets not supported");
+}