[lworld] RFR: 8378167: [lworld] C2: "unused buffer allocation" in do_late_inline_helper

[Quan Anh Mai]

On Thu, 26 Feb 2026 15:33:40 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

> When handling a scalarized return from an inlined method handle call in C2, we assert that we always make use of the buffer that we pre-allocated before the call. The assert is too strong because we could stop parsing in the callee due to an uncommon trap. I added a corresponding test that triggers this because we trap in the callee due to always throwing an exception.
> 
> Thanks,
> Tobias

test/hotspot/jtreg/compiler/valhalla/inlinetypes/TestValueConstruction.java line 1729:

> 1727:     }
> 1728: 
> 1729:     // Method handle with a scalarized return that will always throw an exception

Seems more like an issue with inlining than about `ValueConstruction` to me. Also, will a normal method and `AlwaysIncrementalInline` be enough?

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PR Review Comment: https://git.openjdk.org/valhalla/pull/2177#discussion_r2859820885