[RFC/Patch v2] PR 16113: Allow gdb.Field objects as subscripts on gdb.Value objects

[Siva Chandra <sivachandra at google dot com>]

The attached patch addresses Eli's and Phil Muldoon's comments.

As before, the doc and NEWS changes do not include the description
about the 'parent_type' attribute, which this patch adds to gdb.Field
objects.

2013-12-09  Siva Chandra Reddy  <sivachandra@google.com>

        PR 16113: Allow gdb.Field objects with the subscript operator on
        gdb.Value objects of struct/class values.
        * NEWS (Python Scripting): Add entry for the new feature.
        * 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.

        doc/
        * gdb.texinfo (Values From Inferior): Add a note about using
        gdb.Field objects as subscripts on gdb.Value objects.

Attachment: value_field_subscript_patch_v2.txt
Description: Text document