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From "Alexei Fedotov" <alexei.fedo...@gmail.com>
Subject Re: [drlvm] verifier discussion
Date Thu, 05 Jul 2007 12:18:30 GMT

Your verifier implemented very interesting algorithm.

* We already started moving into Java 6.0 direction, and Java 6.0
suggested a different verification scheme [1]. I see implementing this
scheme as more important task than switching between two old

* When a new scheme is implemented the legacy scheme won't be used
often, this means performance considerations are of less importance
compared to minimal risk considerations and ease of bug fixing. Any
switching comes at the cost of risk and increase in maintenance

* The legacy scheme is to be completely removed from specification
soon, so the new verifier should be separate from the old code. I
found it more productive to decide which verifier code base should be
a base for new development.

What do you think?

[1] New Java SE 6 Feature: Type Checking Verifier,

On 7/5/07, Mikhail Loenko <mloenko@gmail.com> wrote:
> We have passed code and feature freeze recently and have a momentum for
> bigger changes in the code.
> We have recently accepted [1] a contribution of an alternative implementation of
> bytecode verifier [2]
> New implementation demonstrated pretty nice testing [3] and
> performance results [4].
> Though many bugs in current implementation were fixed and it now also
> demonstrate good testing results, the performance difference remains the same.
> I suggest that we switch default implementation for Harmony
> Thanks,
> Mikhail
> [1] http://mail-archives.apache.org/mod_mbox/harmony-dev/200706.mbox/%3c906dd82e0706040145o1173ce6dqcc671777c5b413c6@mail.gmail.com%3e
> [2] http://issues.apache.org/jira/browse/HARMONY-3363
> [3] http://mail-archives.apache.org/mod_mbox/harmony-dev/200703.mbox/%3c8E389A5F2FEABA4CB1DEC35A25CB39CEB48212@mssmsx411%3e
> [4] http://mail-archives.apache.org/mod_mbox/harmony-dev/200703.mbox/%3c906dd82e0703152337n133fafd8t8275ed9277c00204@mail.gmail.com%3e

With best regards,
ESSD, Intel

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