RFR: 8290981: Enable CDS for zero builds [v2]

[Ioi Lam]

On Mon, 15 Aug 2022 17:18:54 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>>> Good stuff. Actually, let me see how easy it is to implement the `nofast_*` bytecodes in Zero, so we don't have to do the shared-code exceptions for it.
>> 
>> That took some debugging :) But here it is, applied on top of your PR: https://cr.openjdk.java.net/~shade/8290981/zero-cds-nofast-1.patch -- builds Linux x86_64 Zero fine, this includes using the Zero VM to compile parts of JDK. I can do more testing later, we should at least test it bootcycles well.
>
>> > Good stuff. Actually, let me see how easy it is to implement the `nofast_*` bytecodes in Zero, so we don't have to do the shared-code exceptions for it.
>> 
>> That took some debugging :) But here it is, applied on top of your PR: https://cr.openjdk.java.net/~shade/8290981/zero-cds-nofast-1.patch -- builds Linux x86_64 Zero fine, this includes using the Zero VM to compile parts of JDK. I can do more testing later, we should at least test it bootcycles well.
> 
> Passes Linux x86_64 fastdebug Zero `make bootcycle-images` too.

@shipilev thanks for sending the patch. I've integrated it. I ran all the tests under test/hotspot/jtreg/runtime/cds/appcds. They all passed after I fixed two of the test cases.

Do you know how much testing is done by the community with zero? We don't test it that much in our pipeline.

-------------

PR: https://git.openjdk.org/jdk/pull/9869