RFR: 8316694: Implement relocation of nmethod within CodeCache [v18]

[Chad Rakoczy]

On Wed, 28 May 2025 15:43:21 GMT, Evgeny Astigeevich <eastigeevich at openjdk.org> wrote:

>> Chad Rakoczy has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add JVMCINMethodData::has_mirror()
>
> src/hotspot/share/code/nmethod.cpp line 1167:
> 
>> 1165: #endif
>> 1166:     + align_up(debug_info->data_size()           , oopSize)
>> 1167:     + align_up((int)sizeof(int)                  , oopSize);
> 
> Why do we need `align_up((int)sizeof(int) , oopSize)`?

That is for the int that keeps track of the number of nmethods using the immutable data. That way it can be shared between the old and new nmethod

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PR Review Comment: https://git.openjdk.org/jdk/pull/23573#discussion_r2112316704