2013-12-12 Siva Chandra Reddy <sivachandra@google.com>

2013-12-12  Siva Chandra Reddy  <sivachandra@google.com>

	PR python/16113
	* NEWS (Python Scripting): Add entry for the new feature and the
	new attribute of gdb.Field objects.
	* python/py-type.c (gdbpy_is_field): New function
	(convert_field): Add 'parent_type' attribute to gdb.Field
	objects.
	* python/py-value.c (valpy_getitem): Allow subscript value to be
	a gdb.Field object.
	(value_has_field): New function
	(get_field_flag): New function
	* python/python-internal.h (gdbpy_is_field): Add declaration.

	testsuite/
	* gdb.python/py-value-cc.cc: Improve test case.
	* gdb.python/py-value-cc.exp: Add new tests to test usage of
	gdb.Field objects as subscripts on gdb.Value objects.

	doc/
	* gdb.texinfo (Values From Inferior): Add a note about using
	gdb.Field objects as subscripts on gdb.Value objects.
	(Types In Python): Add description about the new attribute
	"parent_type" of gdb.Field objects.