RFR: 8326509: Clean up JNIEXPORT in Hotspot after JDK-8017234

[Daniel Jeliński]

On Thu, 22 Feb 2024 16:28:20 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

> Once [JDK-8017234](https://bugs.openjdk.org/browse/JDK-8017234) has been integrated, it is possible to do some cleanup. The goal of [JDK-8017234](https://bugs.openjdk.org/browse/JDK-8017234) was to not change any behavior, even if that behavior seemed odd.
> 
> Now let's try to fix that. We can:
> 
> a) remove JNIEXPORT from c2v functions.
> b) make debug.cpp functions exported similarly on all platforms.
> c) remove JNIEXPORT from aarch64 asm debug function.
> 
> Note that this PR is [dependent on](https://mail.openjdk.org/pipermail/jdk-dev/2021-March/005232.html) https://github.com/openjdk/jdk/pull/17955.

Nice cleanup!

src/hotspot/share/jvmci/vmStructs_jvmci.cpp line 1027:

> 1025: 
> 1026: extern "C" {
> 1027: VMStructEntry* jvmciHotSpotVMStructs = JVMCIVMStructs::localHotSpotVMStructs;

All these globals are unused now. You can remove them.

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PR Review: https://git.openjdk.org/jdk/pull/17967#pullrequestreview-1897492946
PR Review Comment: https://git.openjdk.org/jdk/pull/17967#discussion_r1500284610