RFR: 6983726: Reimplement MethodHandleProxies.asInterfaceInstance [v25]
Mandy Chung
mchung at openjdk.org
Mon Jul 17 16:39:29 UTC 2023
On Tue, 11 Jul 2023 19:22:58 GMT, Chen Liang <liach at openjdk.org> wrote:
>> As John Rose has pointed out in this issue, the current j.l.r.Proxy based implementation of MethodHandleProxies.asInterface has a few issues:
>> 1. Exposes too much information via Proxy supertype (and WrapperInstance interface)
>> 2. Does not allow future expansion to support SAM[^1] abstract classes
>> 3. Slow (in fact, very slow)
>>
>> This patch addresses all 3 problems:
>> 1. It updates the WrapperInstance methods to take an `Empty` to avoid method clashes
>> 2. This patch obtains already generated classes from a ClassValue by the requested interface type; the ClassValue can later be updated to compute implementation generation for abstract classes as well.
>> 3. This patch's faster than old implementation in general.
>>
>> Benchmark for revision 17:
>>
>> Benchmark Mode Cnt Score Error Units
>> MethodHandleProxiesAsIFInstance.baselineAllocCompute avgt 15 1.503 ± 0.021 ns/op
>> MethodHandleProxiesAsIFInstance.baselineCompute avgt 15 0.269 ± 0.005 ns/op
>> MethodHandleProxiesAsIFInstance.testCall avgt 15 1.806 ± 0.018 ns/op
>> MethodHandleProxiesAsIFInstance.testCreate avgt 15 17.332 ± 0.210 ns/op
>> MethodHandleProxiesAsIFInstance.testCreateCall avgt 15 19.296 ± 1.371 ns/op
>> MethodHandleProxiesAsIFInstanceCall.callDoable avgt 5 0.419 ± 0.004 ns/op
>> MethodHandleProxiesAsIFInstanceCall.callHandle avgt 5 0.421 ± 0.004 ns/op
>> MethodHandleProxiesAsIFInstanceCall.callInterfaceInstance avgt 5 1.731 ± 0.018 ns/op
>> MethodHandleProxiesAsIFInstanceCall.callLambda avgt 5 0.418 ± 0.003 ns/op
>> MethodHandleProxiesAsIFInstanceCall.constantDoable avgt 5 0.263 ± 0.003 ns/op
>> MethodHandleProxiesAsIFInstanceCall.constantHandle avgt 5 0.262 ± 0.002 ns/op
>> MethodHandleProxiesAsIFInstanceCall.constantInterfaceInstance avgt 5 0.262 ± 0.002 ns/op
>> MethodHandleProxiesAsIFInstanceCall.constantLambda avgt 5 0.267 ± 0.019 ns/op
>> MethodHandleProxiesAsIFInstanceCall.direct avgt 5 0.266 ± 0.013 ns/op
>> MethodHandleProxiesAsIFInstanceCreate.createCallInterfaceInstance avgt 5 18.057 ± 0.182 ...
>
> Chen Liang has updated the pull request incrementally with one additional commit since the last revision:
>
> Review changees
Looks good. As the hidden interface check is added, the spec needs update to say "The interface must be public and not sealed and not hidden." as the CSR says. (sorry I might have confused you).
The CSR will need update as well as it no longer uses class data.
-------------
Marked as reviewed by mchung (Reviewer).
PR Review: https://git.openjdk.org/jdk/pull/13197#pullrequestreview-1533207972
More information about the core-libs-dev
mailing list