[python][patch] Do not allow invalid/illegal subscripts on values

[Phil Muldoon <pmuldoon at redhat dot com>]

This patches fixes illegal subscripts performed on gdb values through 
Python. The discussion regarding the invalid subscripts is referenced here:

http://permalink.gmane.org/gmane.comp.gdb.devel/26807

This patch checks the value type before allowing a subscript operation 
to proceed. It also adds some regressions and general tests for value 
subscripts.

This patch was tested on x86-64, and causes no regressions.

OK?

Regards

Phil

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ChangeLog

2009-09-16  Phil Muldoon <pmuldoon@redhat.com>

    * py-value.c (valpy_getitem): Test value before allowing subscript
    operation.

Testsuite ChangeLog

2009-09-16  Phil Muldoon <pmuldoon@redhat.com>

    * gdb.python/py-value.exp (test_subscript_regression): New
    function.  Test for invalid subscripts.
    * gdb.python/py-value.c (main): Add test array, and pointer to it.
    (ptr_ref): New function.

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