[PATCH 3/8] Share some code between ctf and tfile target.

[Yao Qi <yao at codesourcery dot com>]

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:

2014-02-12  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): Dont' 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.
---
 gdb/ctf.c             |   48 +------------------------------------------
 gdb/tracefile-tfile.c |   37 +-------------------------------
 gdb/tracefile.c       |   54 +++++++++++++++++++++++++++++++++++++++++++++++++
 gdb/tracefile.h       |    2 +
 4 files changed, 59 insertions(+), 82 deletions(-)

diff --git a/gdb/ctf.c b/gdb/ctf.c
index 8ad363e..8c60545 100644
--- a/gdb/ctf.c
+++ b/gdb/ctf.c
@@ -1733,35 +1733,6 @@ ctf_trace_find (enum trace_find_type type, int num,
   return -1;
 }
 
-/* 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
-ctf_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
-ctf_has_registers (struct target_ops *ops)
-{
-  return get_traceframe_number () != -1;
-}
-
-/* This is the implementation of target_ops method to_thread_alive.
-   CTF trace data has one thread faked by GDB.  */
-
-static int
-ctf_thread_alive (struct target_ops *ops, ptid_t ptid)
-{
-  return 1;
-}
-
 /* This is the implementation of target_ops method to_traceframe_info.
    Iterate the events whose name is "memory", in current
    frame, extract memory range information, and return them in
@@ -1834,23 +1805,12 @@ ctf_traceframe_info (void)
   return info;
 }
 
-/* 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
-ctf_get_trace_status (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;
-}
-
 static void
 init_ctf_ops (void)
 {
   memset (&ctf_ops, 0, sizeof (ctf_ops));
 
+  init_tracefile_ops (&ctf_ops);
   ctf_ops.to_shortname = "ctf";
   ctf_ops.to_longname = "CTF file";
   ctf_ops.to_doc = "Use a CTF directory as a target.\n\
@@ -1860,16 +1820,10 @@ Specify the filename of the CTF directory.";
   ctf_ops.to_fetch_registers = ctf_fetch_registers;
   ctf_ops.to_xfer_partial = ctf_xfer_partial;
   ctf_ops.to_files_info = ctf_files_info;
-  ctf_ops.to_get_trace_status = ctf_get_trace_status;
   ctf_ops.to_trace_find = ctf_trace_find;
   ctf_ops.to_get_trace_state_variable_value
     = ctf_get_trace_state_variable_value;
-  ctf_ops.to_stratum = process_stratum;
-  ctf_ops.to_has_stack = ctf_has_stack;
-  ctf_ops.to_has_registers = ctf_has_registers;
   ctf_ops.to_traceframe_info = ctf_traceframe_info;
-  ctf_ops.to_thread_alive = ctf_thread_alive;
-  ctf_ops.to_magic = OPS_MAGIC;
 }
 
 #endif
diff --git a/gdb/tracefile-tfile.c b/gdb/tracefile-tfile.c
index 1310151..205494e 100644
--- a/gdb/tracefile-tfile.c
+++ b/gdb/tracefile-tfile.c
@@ -557,17 +557,6 @@ tfile_files_info (struct target_ops *t)
   printf_filtered ("\t`%s'\n", trace_filename);
 }
 
-/* The trace status for a file is that tracing can never be run.  */
-
-static int
-tfile_get_trace_status (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;
-}
-
 static void
 tfile_get_tracepoint_status (struct breakpoint *tp, struct uploaded_tp *utp)
 {
@@ -1029,24 +1018,6 @@ tfile_has_memory (struct target_ops *ops)
   return 1;
 }
 
-static int
-tfile_has_stack (struct target_ops *ops)
-{
-  return get_traceframe_number () != -1;
-}
-
-static int
-tfile_has_registers (struct target_ops *ops)
-{
-  return get_traceframe_number () != -1;
-}
-
-static int
-tfile_thread_alive (struct target_ops *ops, ptid_t ptid)
-{
-  return 1;
-}
-
 /* Callback for traceframe_walk_blocks.  Builds a traceframe_info
    object for the tfile target's current traceframe.  */
 
@@ -1113,6 +1084,8 @@ tfile_traceframe_info (void)
 static void
 init_tfile_ops (void)
 {
+  init_tracefile_ops (&tfile_ops);
+
   tfile_ops.to_shortname = "tfile";
   tfile_ops.to_longname = "Local trace dump file";
   tfile_ops.to_doc
@@ -1122,19 +1095,13 @@ init_tfile_ops (void)
   tfile_ops.to_fetch_registers = tfile_fetch_registers;
   tfile_ops.to_xfer_partial = tfile_xfer_partial;
   tfile_ops.to_files_info = tfile_files_info;
-  tfile_ops.to_get_trace_status = tfile_get_trace_status;
   tfile_ops.to_get_tracepoint_status = tfile_get_tracepoint_status;
   tfile_ops.to_trace_find = tfile_trace_find;
   tfile_ops.to_get_trace_state_variable_value
     = tfile_get_trace_state_variable_value;
-  tfile_ops.to_stratum = process_stratum;
   tfile_ops.to_has_all_memory = tfile_has_all_memory;
   tfile_ops.to_has_memory = tfile_has_memory;
-  tfile_ops.to_has_stack = tfile_has_stack;
-  tfile_ops.to_has_registers = tfile_has_registers;
   tfile_ops.to_traceframe_info = tfile_traceframe_info;
-  tfile_ops.to_thread_alive = tfile_thread_alive;
-  tfile_ops.to_magic = OPS_MAGIC;
 }
 
 extern initialize_file_ftype _initialize_tracefile_tfile;
diff --git a/gdb/tracefile.c b/gdb/tracefile.c
index 9945ae5..0f8ffc5 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 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
diff --git a/gdb/tracefile.h b/gdb/tracefile.h
index 833de5c..db454e3 100644
--- a/gdb/tracefile.h
+++ b/gdb/tracefile.h
@@ -111,4 +111,6 @@ struct trace_file_writer
 
 extern struct trace_file_writer *tfile_trace_file_writer_new (void);
 
+extern void init_tracefile_ops (struct target_ops *ops);
+
 #endif /* TRACEFILE_H */
-- 
1.7.7.6