[RFA 10/14] Use gdbpy_reference in call_doc_function

[Tom Tromey <tom at tromey dot com>]

This changes call_doc_function to use gdbpy_reference.

2016-11-06  Tom Tromey  <tom@tromey.com>

	* python/py-param.c (call_doc_function): Use gdbpy_reference.
---
 gdb/ChangeLog         |  4 ++++
 gdb/python/py-param.c | 11 +++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 9aa7008..9544515 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,9 @@
 2016-11-06  Tom Tromey  <tom@tromey.com>
 
+	* python/py-param.c (call_doc_function): Use gdbpy_reference.
+
+2016-11-06  Tom Tromey  <tom@tromey.com>
+
 	* python/py-linetable.c (build_line_table_tuple_from_pcs)
 	(ltpy_get_all_source_lines): Use gdbpy_reference.
 
diff --git a/gdb/python/py-param.c b/gdb/python/py-param.c
index 3604f9f..dae2f7b 100644
--- a/gdb/python/py-param.c
+++ b/gdb/python/py-param.c
@@ -27,6 +27,7 @@
 #include "completer.h"
 #include "language.h"
 #include "arch-utils.h"
+#include "py-ref.h"
 
 /* Parameter constants and their values.  */
 struct parm_constant
@@ -331,15 +332,14 @@ static char *
 call_doc_function (PyObject *obj, PyObject *method, PyObject *arg)
 {
   char *data = NULL;
-  PyObject *result = PyObject_CallMethodObjArgs (obj, method, arg, NULL);
+  gdbpy_reference result (PyObject_CallMethodObjArgs (obj, method, arg, NULL));
 
-  if (! result)
+  if (result == NULL)
     return NULL;
 
-  if (gdbpy_is_string (result))
+  if (gdbpy_is_string (result.get ()))
     {
-      data = python_string_to_host_string (result);
-      Py_DECREF (result);
+      data = python_string_to_host_string (result.get ());
       if (! data)
 	return NULL;
     }
@@ -347,7 +347,6 @@ call_doc_function (PyObject *obj, PyObject *method, PyObject *arg)
     {
       PyErr_SetString (PyExc_RuntimeError,
 		       _("Parameter must return a string value."));
-      Py_DECREF (result);
       return NULL;
     }
 
-- 
2.7.4