RFR: 8336856: Efficient hidden class-based string concatenation strategy [v48]

[Shaojin Wen]

On Tue, 13 Aug 2024 01:39:33 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> This PR implements the same algorithm as the current generateMHInlineCopy based on bytecode to improve startup performance.
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   add jtreg HiddenClassUnloading

Instrumentation::getAllLoadedClasses() cannot be called within the current process. I used ManagementFactory.getClassLoadingMXBean().getUnloadedClassCount(), which is not as accurate, but barely usable.

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PR Comment: https://git.openjdk.org/jdk/pull/20273#issuecomment-2285186006