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From: "tromey at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug python/16113] New: gdb.Value needs a way to reference a
 superclass sub-object
Date: Fri, 01 Nov 2013 18:26:00 -0000
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X-Bugzilla-Product: gdb
X-Bugzilla-Component: python
X-Bugzilla-Version: HEAD
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X-Bugzilla-Who: tromey at redhat dot com
X-Bugzilla-Status: NEW
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https://sourceware.org/bugzilla/show_bug.cgi?id=16113

            Bug ID: 16113
           Summary: gdb.Value needs a way to reference a superclass
                    sub-object
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: python
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at redhat dot com

Right now if you have a gdb.Value whose type is some class,
and the class has a superclass, then there is no good way
to refer to the phony "field" that gdb creates to represent
the superclass.

That is, for an ordinary field you can use value["fieldname"] --
but the superclass field doesn't have a regular name.

We should extend valpy_getitem to also accept a gdb.Field
as an index.  This way a program could use the Type API to
find the superclass field, and then pass this to the [] operation
to extract the desired sub-object.

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