RFR: 8293979: Resolve JVM_CONSTANT_Class references at CDS dump time [v4]
Coleen Phillimore
coleenp at openjdk.org
Thu Oct 20 00:18:47 UTC 2022
On Wed, 19 Oct 2022 18:39:25 GMT, Ioi Lam <iklam at openjdk.org> wrote:
>> Some `JVM_CONSTANT_Class` entries are guaranteed to resolve to the same value at both CDS dump time and run time:
>>
>> - Classes that are resolved during `vmClasses::resolve_all()`. These classes cannot be replaced by JVMTI agents at run time.
>> - Supertypes -- at run time, a class `C` can be loaded from the CDS archive only if all of `C`'s super types are also loaded from the CDS archive. Therefore, we know that a `JVM_CONSTANT_Class` reference to a supertype of `C` must resolved to the same value at both CDS dump time and run time.
>>
>> By doing the resolution at dump time, we can speed up run time start-up by a little bit.
>>
>> The `ClassPrelinker` class added by this PR will also be used in future REFs for pre-resolving other constant pool entries. The ultimate goal is to resolve `invokedynamic` and `invokehandle` so we can significantly improve the start-up time of features such as Lambda expressions and String concatenation. See [JDK-8293336](https://bugs.openjdk.org/browse/JDK-8293336)
>
> Ioi Lam has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:
>
> - @coleenp comments: changed to AllStatic
> - Merge branch 'master' into 8293979-resolve-class-references-at-dumptime
> - fixed product build
> - @coleenp comments
> - Merge branch 'master' into 8293979-resolve-class-references-at-dumptime
> - 8293979: Resolve JVM_CONSTANT_Class references at CDS dump time
Maybe the third read is the charm but this makes sense to me, and looks good.
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Marked as reviewed by coleenp (Reviewer).
PR: https://git.openjdk.org/jdk/pull/10330
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