RFR: 8316694: Implement relocation of nmethod within CodeCache [v32]

[Andrew Haley]

On Tue, 1 Jul 2025 08:05:50 GMT, Evgeny Astigeevich <eastigeevich at openjdk.org> wrote:

> @theRealAph When we don't need a trampoline (a call site is a direct call), we update the trampoline to have the same destination as the call site.

Yes, that's fundamental to the design.

> I have not found places in Hotspot relying on this. Do you remember why we are doing this? Is it Ok not to update trampolines in the case of reachable destinations?

No. We always keep the trampoline up to date so that we don't have to deal with a race condition when patching trampoline calls.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23573#discussion_r2176812614