review for 7055355: JSR 292: crash while throwing WrongMethodTypeException

[John Rose]

On Jun 16, 2011, at 10:18 AM, Tom Rodriguez wrote:

> I increased the slop value in my last set of changes and we're currently not failing this test that I can see.  I agree that the test is slightly mystifying and wouldn't mind removing it.

I would prefer to keep it for the following reason:

When control returns to a RF, the SP is restored to a saved value.  Comparing it to the saved argument base is a reasonable thing, since the RF is known to contain only (a) up to 255 saved arguements, and (b) a a few words of fixed overhead.  If the restored SP is bad, and/or if the saved argument base is bad, we can detect this quickly using the comparison before the corruption goes further.

The slop has to be large enough to contain the "save_frame" size used by the RF.

-- John