[foreign-preview] Integrated: 8276648: Downcall stubs are never freed

[Jorn Vernee]

On Tue, 22 Feb 2022 14:06:28 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> Hi,
> 
> The current code adds native invokers (downcall stubs) to a CocurrentHashMap cache, and they stay there until the application exits.
> 
> This patch replaces that cache with a SoftReferenceCache (brought to the top level from AbstractLinker), which allows at least the values to be evicted when they become unreachable.
> 
> Those value, which are NativeEntryPoint instances, are also registered with a cleaner, whose cleanup action will free the stub from the code cache.
> 
> Thanks,
> Jorn

This pull request has now been integrated.

Changeset: 4115fcbe
Author:    Jorn Vernee <jvernee at openjdk.org>
URL:       https://git.openjdk.java.net/panama-foreign/commit/4115fcbeed5db7073a3b156192e74c2a3df7b768
Stats:     135 lines in 5 files changed: 88 ins; 35 del; 12 mod

8276648: Downcall stubs are never freed

Reviewed-by: mcimadamore

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PR: https://git.openjdk.java.net/panama-foreign/pull/651