Integrated: 8315131: Clarify VarHandle set/get access on 32-bit platforms

[Chen Liang]

On Thu, 10 Jul 2025 23:40:15 GMT, Chen Liang <liach at openjdk.org> wrote:

> On 32 bit platforms, when an access to long/double is aligned, it is supported but not atomic. The original wording in `MethodHandles::byteBufferViewVarHandle` sounds as if it is not supported at all. We can fix that by borrowing the improved specification from `MemoryLayout::varHandle`.
> 
> Note: This doc is copied from https://github.com/openjdk/jdk/blob/ee0d309bbd33302d8c6f35155e975db77aaea785/src/java.base/share/classes/java/lang/foreign/MemoryLayout.java#L279-L282 with slight adjustments. See the rendering at https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/lang/foreign/MemoryLayout.html#access-mode-restrictions

This pull request has now been integrated.

Changeset: ea6674fe
Author:    Chen Liang <liach at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/ea6674fec8702eea481afa7ca7e522cbacd53841
Stats:     8 lines in 2 files changed: 1 ins; 0 del; 7 mod

8315131: Clarify VarHandle set/get access on 32-bit platforms

Reviewed-by: rgiulietti, mcimadamore, jrose, shade, psandoz

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PR: https://git.openjdk.org/jdk/pull/26258