RFR: 8336489: Track scoped accesses in JVMCI compiled code [v4]
Carlo Refice
duke at openjdk.org
Fri Jul 26 17:16:03 UTC 2024
On Fri, 26 Jul 2024 17:02:33 GMT, Carlo Refice <duke at openjdk.org> wrote:
>> This PR adds JVMCI support to scoped access tracking introduced in #20158.
>>
>> In this PR:
>> * The `Method::is_scoped` flag is now exposed in JVMCI as `HotSpotResolvedJavaMethod.isScoped()`, and serialized to / deserialized from the JVMCI compiled code stream as a boolean flag.
>> * To determine whether a compiled method has a scoped access, we simply check `HotSpotResolvedJavaMethod.isScoped()` returns `true` for the root method or any of the methods that were inlined in the compilation.
>> * The above check is implemented as the method `HotSpotCompiledNMethod.hasScopedAccess()`, instead of as an explicit flag set in a the constructor of `HotSpotCompiledNMethod`. This keeps the change isolated to JVMCI, without requiring coordinated changes to the Graal compiler. No other changes in the compiler are necessary to benefit from the optimization.
>
> Carlo Refice has refreshed the contents of this pull request, and previous commits have been removed. Incremental views are not available.
Apologies for the second force push, I involuntarily rebased my branch on top of `origin/master` again
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PR Comment: https://git.openjdk.org/jdk/pull/20256#issuecomment-2253163116
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