[RFA 1/7] Probes API convenience patch

[Gary Benson <gbenson@redhat.com>]

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This patch exposes part of the probes API in a more convenient
way.  I've included it for completeness, but it has previously
been approved:

  http://www.cygwin.com/ml/gdb-patches/2012-07/msg00340.html

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2013-05-16  Gary Benson  <gbenson@redhat.com>

	* probe.h (get_probe_argument_count): New declaration.
	(evaluate_probe_argument): Likewise.
	* probe.c (get_probe_argument_count): New function.
	(evaluate_probe_argument): Likewise.
	(probe_safe_evaluate_at_pc): Use the above new functions.

diff --git a/gdb/probe.h b/gdb/probe.h
index 8d44ca2..1d29b87 100644
--- a/gdb/probe.h
+++ b/gdb/probe.h
@@ -214,6 +214,16 @@ extern void info_probes_for_ops (char *arg, int from_tty,
 
 extern struct cmd_list_element **info_probes_cmdlist_get (void);
 
+/* Return the argument count of the specified probe.  */
+
+extern unsigned get_probe_argument_count (struct probe *probe);
+
+/* Evaluate argument N of the specified probe.  N must be between 0
+   inclusive and get_probe_argument_count exclusive.  */
+
+extern struct value *evaluate_probe_argument (struct probe *probe,
+					      unsigned n);
+
 /* A convenience function that finds a probe at the PC in FRAME and
    evaluates argument N, with 0 <= N < number_of_args.  If there is no
    probe at that location, or if the probe does not have enough arguments,
diff --git a/gdb/probe.c b/gdb/probe.c
index 77f3b13..a61f4ea 100644
--- a/gdb/probe.c
+++ b/gdb/probe.c
@@ -608,28 +608,55 @@ info_probes_command (char *arg, int from_tty)
 
 /* See comments in probe.h.  */
 
+unsigned
+get_probe_argument_count (struct probe *probe)
+{
+  const struct sym_probe_fns *probe_fns;
+
+  gdb_assert (probe->objfile != NULL);
+  gdb_assert (probe->objfile->sf != NULL);
+
+  probe_fns = probe->objfile->sf->sym_probe_fns;
+
+  gdb_assert (probe_fns != NULL);
+
+  return probe_fns->sym_get_probe_argument_count (probe);
+}
+
+/* See comments in probe.h.  */
+
+struct value *
+evaluate_probe_argument (struct probe *probe, unsigned n)
+{
+  const struct sym_probe_fns *probe_fns;
+
+  gdb_assert (probe->objfile != NULL);
+  gdb_assert (probe->objfile->sf != NULL);
+
+  probe_fns = probe->objfile->sf->sym_probe_fns;
+
+  gdb_assert (probe_fns != NULL);
+
+  return probe_fns->sym_evaluate_probe_argument (probe, n);
+}
+
+/* See comments in probe.h.  */
+
 struct value *
 probe_safe_evaluate_at_pc (struct frame_info *frame, unsigned n)
 {
   struct probe *probe;
-  const struct sym_probe_fns *probe_fns;
   unsigned n_args;
 
   probe = find_probe_by_pc (get_frame_pc (frame));
   if (!probe)
     return NULL;
 
-  gdb_assert (probe->objfile != NULL);
-  gdb_assert (probe->objfile->sf != NULL);
-  gdb_assert (probe->objfile->sf->sym_probe_fns != NULL);
-
-  probe_fns = probe->objfile->sf->sym_probe_fns;
-  n_args = probe_fns->sym_get_probe_argument_count (probe);
-
+  n_args = get_probe_argument_count (probe);
   if (n >= n_args)
     return NULL;
 
-  return probe_fns->sym_evaluate_probe_argument (probe, n);
+  return evaluate_probe_argument (probe, n);
 }
 
 /* See comment in probe.h.  */