RFR(m): 8220351: Cross-modifying code

[Andrew Haley]

On 3/11/19 8:08 AM, Robbin Ehn wrote:

> For simplicity I'll talk about x86, which have instruction cache
> coherency.

I don't think this is the right approach.

You've put fences into shared code, but the semantics to make this
work correctly are different on different platforms. For example, some
platforms may not use patching, but instead use the constant
pool. Some platforms may need cache flushes as well as fences, so the
solution presented here is either inadequate, inefficient, or both.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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