RFR: 8337753: Target class of upcall stub may be unloaded [v4]

[Amit Kumar]

On Wed, 4 Sep 2024 17:03:32 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

>> Tier1 test are fine with/without "saving & restoring" return_pc;
>
> I found it: https://github.com/openjdk/jdk/blob/433f6d8a0643b59663bf76c0f3a2af27a6cc56b7/src/hotspot/cpu/s390/gc/g1/g1BarrierSetAssembler_s390.cpp#L238
> Called here:
> https://github.com/openjdk/jdk/blob/433f6d8a0643b59663bf76c0f3a2af27a6cc56b7/src/hotspot/cpu/s390/gc/g1/g1BarrierSetAssembler_s390.cpp#L115
> Other GCs with load barriers are not implemented, so the save&restore code is redundant.
> The stub is frameless and only needs the save&restore code when calling C.
> In this case, no weak references are used, so there's no C call on s390.

@JornVernee would you please remove "saving & restoring" code for the return PC as mentioned by Martin. Thanks.

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PR Review Comment: https://git.openjdk.org/jdk/pull/20479#discussion_r1745819490