RFR: 8340212: -Xshare:off -XX:CompressedClassSpaceBaseAddress=0x40001000000 crashes on macos-aarch64 [v10]

[Coleen Phillimore]

On Thu, 5 Dec 2024 16:51:21 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Added checks to verify that the given compressed class base or shared base address and shift given will be decodable for aarch64.  This code is moved in PR https://github.com/openjdk/jdk/pull/20677 so this would be moved to the new place once that's integrated.
>> 
>> Tested with tier1-7.
>
> Coleen Phillimore has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 10 commits:
> 
>  - Merge branch 'master' into decode-mode
>  - Recalculate decode mode if OS picks a different encoding.
>  - Only calculate klass-decode-mode in one place.
>  - Missed one. Another good reason to not copy code.
>  - Rename ceil_log2 to log2i_ceil
>  - Merge branch 'master' into decode-mode
>  - Merge with incoming change for PR https://github.com/openjdk/jdk/pull/21932
>  - Merge branch 'master' into decode-mode
>  - include formatBuffer.hpp
>  - 8340212: -Xshare:off -XX:CompressedClassSpaceBaseAddress=0x40001000000 crashes on macos-aarch64

Thanks for your comments Ioi.

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PR Review: https://git.openjdk.org/jdk/pull/21695#pullrequestreview-2489526410