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

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Reviewed-by: rgiulietti, mcimadamore, jrose, shade, psandoz
This commit is contained in:
Chen Liang 2025-07-22 17:25:00 +00:00
parent d714b5d3da
commit ea6674fec8
2 changed files with 8 additions and 7 deletions
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8
src/java.base/share/classes/java/lang/foreign/MemoryLayout.java
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@ -276,10 +276,10 @@ import java.util.stream.Stream;
* if {@code A >= S}. An aligned var handle is guaranteed to support the following
* access modes:
* <ul>
* <li>read write access modes for all {@code T}. On 32-bit platforms, access modes
* {@code get} and {@code set} for {@code long}, {@code double} and {@code MemorySegment}
* are supported but might lead to word tearing, as described in Section {@jls 17.7}.
* of <cite>The Java Language Specification</cite>.
* <li>read write access modes for all {@code T}. Access modes {@code get} and
* {@code set} for {@code long}, {@code double} and {@code MemorySegment}
* are supported but have no atomicity guarantee, as described in Section
* {@jls 17.7} of <cite>The Java Language Specification</cite>.
* <li>atomic update access modes for {@code int}, {@code long},
* {@code float}, {@code double} and {@link MemorySegment}.
* (Future major platform releases of the JDK may support additional

7
src/java.base/share/classes/java/lang/invoke/MethodHandles.java
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@ -4305,9 +4305,10 @@ return mh1;
* If access is aligned then following access modes are supported and are
* guaranteed to support atomic access:
* <ul>
* <li>read write access modes for all {@code T}, with the exception of
* access modes {@code get} and {@code set} for {@code long} and
* {@code double} on 32-bit platforms.
* <li>read write access modes for all {@code T}. Access modes {@code get}
* and {@code set} for {@code long} and {@code double} are supported but
* have no atomicity guarantee, as described in Section {@jls 17.7} of
* <cite>The Java Language Specification</cite>.
* <li>atomic update access modes for {@code int}, {@code long},
* {@code float} or {@code double}.
* (Future major platform releases of the JDK may support additional