Integrated: 8259339: AllocateUninitializedArray C2 intrinsic fails with void.class input

[Tobias Hartmann]

On Wed, 6 Jan 2021 17:38:00 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> Since [JDK-8150465](https://bugs.openjdk.java.net/browse/JDK-8150465), `LibraryCallKit::inline_unsafe_newArray` is also used by the `_allocateUninitializedArray` intrinsic. To handle a `void.class` input, a runtime (slow) call to the intrinsified method is emitted. We hit a guarantee in `generate_method_call_static` because a wrong intrinsic id is passed. Also, the call to `Unsafe.allocateUninitializedArray0` should be virtual.
> 
> I found this when running Valhalla stress testing with `-XX:PerMethodTrapLimit=0` but it easily reproduces without (see modified test).
> 
> Thanks,
> Tobias

This pull request has now been integrated.

Changeset: 0e6de4eb
Author:    Tobias Hartmann <thartmann at openjdk.org>
URL:       https://git.openjdk.java.net/jdk/commit/0e6de4eb
Stats:     20 lines in 2 files changed: 16 ins; 0 del; 4 mod

8259339: AllocateUninitializedArray C2 intrinsic fails with void.class input

Reviewed-by: kvn, chagedorn

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PR: https://git.openjdk.java.net/jdk/pull/1965