RFR: 8318586: Explicitly handle upcall stub allocation failure [v2]

[Jorn Vernee]

On Thu, 26 Oct 2023 12:17:22 GMT, David Holmes <dholmes at openjdk.org> wrote:

> Is stub allocation the same as other VM C heap exhaustion cases?

I think it depends on the particular case. e.g. `Unsafe::allocateMemory` can also throw OOME.

I think an allocation failure in the particular case of the FFM Linker allocating stubs, is something that we can reasonably report back to the user.

Looking at this again, I realize that we're also allocating a `BufferBlob` when creating the `CodeBuffer`, which is a far bigger allocation, and we never check whether that allocation fails either. I'll have a more thorough look at this.

I agree that bubbling up the allocation failures as OOME would be better.

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PR Comment: https://git.openjdk.org/jdk/pull/16311#issuecomment-1781077051