[lworld] RFR: 8371604: [lworld] SIGSEGV in InlineKlass::is_payload_marked_as_null

[Frederic Parain]

On Thu, 20 Nov 2025 12:24:10 GMT, Paul Hübner <phubner at openjdk.org> wrote:

> Hi all,
> 
> This patch fixes several `int` overflows relating to flat array element loads/stores. 
> I've included some gtests that address a subset of these changes.  We should test flat arrays larger than 16GB in size, which is not something we can feasibly do in our tier1 jtreg tests. I've filed [JDK-8372261](https://bugs.openjdk.org/browse/JDK-8372261) as a follow-up RFE to investigate this.
> 
> Testing: tiers 1-4, [`LocalityCheck.java`](https://bugs.openjdk.org/secure/attachment/117136/LocalityCheck.java) run locally 100 times.

There's another occurance of this int overflow with the _offset field in DelayedFieldAccess (c1_GraphBuilder.hpp).

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PR Comment: https://git.openjdk.org/valhalla/pull/1752#issuecomment-3559360696