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Investigate JEP 394: Pattern Matching for instanceof #22296

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tgodzik opened this issue Jan 2, 2025 · 2 comments
Open

Investigate JEP 394: Pattern Matching for instanceof #22296

tgodzik opened this issue Jan 2, 2025 · 2 comments
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area:jdk Issues tied to artifacts published under a particular jdk compat:java:jep:stable Issues corresponding to a JEP which got already delivered as a stable feature in a JDK release compat:java:jep Issues corresponding to a JEP (JDK Enhancement Proposal) itype:enhancement

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@tgodzik
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tgodzik commented Jan 2, 2025

JEP 394 introduced Pattern Matching for instanceof. Since we are planning to update to a newer JDK at an unspecified future I hope we can figure out if this is in any way useful to use for example for some bytecode optimization similar to #22249

And if we can actually use them or whether it will be impossible for us.

Introduced in JDK 15
@tgodzik tgodzik added area:jdk Issues tied to artifacts published under a particular jdk compat:java:jep Issues corresponding to a JEP (JDK Enhancement Proposal) compat:java:jep:stable Issues corresponding to a JEP which got already delivered as a stable feature in a JDK release labels Jan 2, 2025
@sjrd
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sjrd commented Jan 2, 2025

It doesn't seem like this JEP introduced any new byte code. So I believe there is nothing to take advantage of, here.

@He-Pin
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He-Pin commented Jan 2, 2025 •
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introduce a typeswitch in lambda factory.
java.lang.runtime.SwitchBootstraps#typeSwitch since Java 21

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area:jdk Issues tied to artifacts published under a particular jdk compat:java:jep:stable Issues corresponding to a JEP which got already delivered as a stable feature in a JDK release compat:java:jep Issues corresponding to a JEP (JDK Enhancement Proposal) itype:enhancement
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@He-Pin @sjrd @tgodzik @Gedochao