[Patch v18 4/4] Add xmethod support to the Python API

[Siva Chandra <sivachandra at google dot com>]

The attached patch addresses all of Doug's comments for this part from
last time. The previous version for this part was not numbered 17. I
am syncing all parts to v18 now to avoid confusion.

ChangeLog:
2014-05-23  Siva Chandra Reddy  <sivachandra@google.com>

        * python/py-xmethods.c: New file.
        * python/py-objfile.c (objfile_object): New field 'xmethods'.
        (objfpy_dealloc): XDECREF on the new xmethods field.
        (objfpy_new, objfile_to_objfile_object): Initialize xmethods
        field.
        (objfpy_get_xmethods): New function.
        (objfile_getset): New entry 'xmethods'.
        * python/py-progspace.c (pspace_object): New field 'xmethods'.
        (pspy_dealloc): XDECREF on the new xmethods field.
        (pspy_new, pspace_to_pspace_object): Initialize xmethods
        field.
        (pspy_get_xmethods): New function.
        (pspace_getset): New entry 'xmethods'.
        * python/python-internal.h: Add declarations for new functions.
        * python/python.c (_initialize_python): Invoke
        gdbpy_initialize_xmethods.
        * python/lib/gdb/__init__.py (xmethods): New
        attribute.
        * python/lib/gdb/xmethod.py: New file.
        * python/lib/gdb/command/xmethods.py: New file.

        testuite/
        * gdb.python/py-xmethods.cc: New testcase to test xmethods.
        * gdb.python/py-xmethods.exp: New tests to test xmethods.
        * gdb.python/py-xmethods.py: Python script supporting the
        new testcase and tests.

Attachment: xmethod_python_api_v18.txt
Description: Text document