[Python] Add methods reference_value and const_value to gdb.Value.

gdb/ChangeLog:

	* NEWS (Python Scripting): Mention the new gdb.Value methods.
	* python/py-value.c (valpy_reference_value): New function.
	(valpy_const_value): Likewise.
	(value_object_methods): Add new methods.
	* value.c (make_cv_value): New function.
	* value.h (make_cv_value): Declare.

gdb/doc/ChangeLog:

	* python.texi (Values From Inferior): Add descriptions of new
	methods gdb.Value.reference_value and gdb.Value.const_value.

gdb/testsuite/ChangeLog:

	* gdb.python/py-xmethods.cc: Enhance test case.
	* gdb.python/py-xmethods.exp: New tests.
	* gdb.python/py-xmethods.py (A_indexoper): New xmethod worker
	function.
	(B_indexoper): Likewise.
	(global_dm_list) : Add new xmethod worker functions.

1 files changed, 3 insertions, 0 deletions

diff --git a/gdb/NEWS b/gdb/NEWS
index 0c7084a..51e4f4e 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -57,6 +57,9 @@
   ** gdb.Type objects have a new method "optimized_out",
      returning optimized out gdb.Value instance of this type.
   ** Xmethods can now specify a result type.
+  ** gdb.Value objects have new methods "reference_value" and
+     "const_value" which return a reference to the value and a
+     "const" version of the value respectively.
 
 * New commands