Share some code between ctf and tfile target.

This patch move the duplicated code between tfile and ctf
targets into file tracefile.c.  The common part of target_ops
fields are set in init_tracefile_ops.

gdb:

2014-02-23  Yao Qi  <yao@codesourcery.com>

	* ctf.c (ctf_has_stack, ctf_has_registers): Remove.
	(ctf_thread_alive, ctf_get_trace_status): Remove.
	(init_ctf_ops): Don't set some fields of ctf_ops.  Call
	init_tracefile_ops.
	* tracefile-tfile.c (tfile_get_trace_status): Remove.
	(tfile_has_stack, tfile_has_registers): Remove.
	(tfile_thread_alive): Remove.
	(init_tfile_ops): Don't set some fields of tfile_ops.  Call
	init_tracefile_ops.
	* tracefile.c (tracefile_has_stack): New function.
	(tracefile_has_registers): New function.
	(tracefile_thread_alive): New function.
	(tracefile_get_trace_status): New function.
	(init_tracefile_ops): New function.
	* tracefile.h (init_tracefile_ops): Declare.

1 files changed, 54 insertions, 0 deletions

diff --git a/gdb/tracefile.c b/gdb/tracefile.c
index 9945ae5..7972290 100644
--- a/gdb/tracefile.c
+++ b/gdb/tracefile.c
@@ -376,6 +376,60 @@ trace_save_ctf (const char *dirname, int target_does_save)
   do_cleanups (back_to);
 }
 
+/* This is the implementation of target_ops method to_has_stack.
+   The target has a stack when GDB has already selected one trace
+   frame.  */
+
+static int
+tracefile_has_stack (struct target_ops *ops)
+{
+  return get_traceframe_number () != -1;
+}
+
+/* This is the implementation of target_ops method to_has_registers.
+   The target has registers when GDB has already selected one trace
+   frame.  */
+
+static int
+tracefile_has_registers (struct target_ops *ops)
+{
+  return get_traceframe_number () != -1;
+}
+
+/* This is the implementation of target_ops method to_thread_alive.
+   tracefile has one thread faked by GDB.  */
+
+static int
+tracefile_thread_alive (struct target_ops *ops, ptid_t ptid)
+{
+  return 1;
+}
+
+/* This is the implementation of target_ops method to_get_trace_status.
+   The trace status for a file is that tracing can never be run.  */
+
+static int
+tracefile_get_trace_status (struct target_ops *self, struct trace_status *ts)
+{
+  /* Other bits of trace status were collected as part of opening the
+     trace files, so nothing to do here.  */
+
+  return -1;
+}
+
+/* Initialize OPS for tracefile related targets.  */
+
+void
+init_tracefile_ops (struct target_ops *ops)
+{
+  ops->to_stratum = process_stratum;
+  ops->to_get_trace_status = tracefile_get_trace_status;
+  ops->to_has_stack = tracefile_has_stack;
+  ops->to_has_registers = tracefile_has_registers;
+  ops->to_thread_alive = tracefile_thread_alive;
+  ops->to_magic = OPS_MAGIC;
+}
+
 extern initialize_file_ftype _initialize_tracefile;
 
 void