Turn gdbpy_ref into a template

This turns gdbpy_ref into a template class, so that it can be used to
wrap subclasses of PyObject.  The default argument remains PyObject;
and this necessitated renaming uses of "gdbpy_ref" to "gdbpy_ref<>".

gdb/ChangeLog
2017-02-10  Tom Tromey  <tom@tromey.com>

	* python/py-ref.h (gdbpy_ref_policy): Now a template.
	(gdbpy_ref): Now a template; allow subclasses of PyObject to be
	used.
	* python/py-arch.c, python/py-bpevent.c, python/py-breakpoint.c,
	python/py-cmd.c, python/py-continueevent.c, python/py-event.c,
	python/py-exitedevent.c, python/py-finishbreakpoint.c,
	python/py-framefilter.c, python/py-function.c,
	python/py-inferior.c, python/py-infevents.c,
	python/py-linetable.c, python/py-newobjfileevent.c,
	python/py-param.c, python/py-prettyprint.c, python/py-ref.h,
	python/py-signalevent.c, python/py-stopevent.c,
	python/py-symbol.c, python/py-threadevent.c, python/py-type.c,
	python/py-unwind.c, python/py-utils.c, python/py-value.c,
	python/py-varobj.c, python/py-xmethods.c, python/python.c,
	varobj.c: Change gdbpy_ref to gdbpy_ref<>.

1 files changed, 8 insertions, 5 deletions

diff --git a/gdb/python/py-ref.h b/gdb/python/py-ref.h
index b2479bf..8568e5c 100644
--- a/gdb/python/py-ref.h
+++ b/gdb/python/py-ref.h
@@ -1,6 +1,6 @@
 /* Python reference-holding class
 
-   Copyright (C) 2016 Free Software Foundation, Inc.
+   Copyright (C) 2016-2017 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -23,20 +23,23 @@
 #include "common/gdb_ref_ptr.h"
 
 /* A policy class for gdb::ref_ptr for Python reference counting.  */
+template<typename T>
 struct gdbpy_ref_policy
 {
-  static void incref (PyObject *ptr)
+  static void incref (T *ptr)
   {
     Py_INCREF (ptr);
   }
 
-  static void decref (PyObject *ptr)
+  static void decref (T *ptr)
   {
     Py_DECREF (ptr);
   }
 };
 
-/* A gdb::ref_ptr that has been specialized for Python objects.  */
-typedef gdb::ref_ptr<PyObject, gdbpy_ref_policy> gdbpy_ref;
+/* A gdb::ref_ptr that has been specialized for Python objects or
+   their "subclasses".  */
+template<typename T = PyObject> using gdbpy_ref
+  = gdb::ref_ptr<T, gdbpy_ref_policy<T>>;
 
 #endif /* GDB_PYTHON_REF_H */