RFR: 8308293: A linker should expose the layouts it supports [v2]

[Maurizio Cimadamore]

On Wed, 17 May 2023 22:08:57 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

>> Maurizio Cimadamore has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Tweak javadoc
>
> src/java.base/share/classes/java/lang/foreign/Linker.java line 219:
> 
>> 217:  * <ol>
>> 218:  * <li>the alignment constraint of {@code G} is set to its <a href="MemoryLayout.html#layout-align">natural alignment</a>;</li>
>> 219:  * <li>the size of {@code G} is a multiple of its alignment constraint;</li>
> 
> Do you think this is a constraint that will hold across all linker implementations?

All "native linkers" as the text says. Other linkers (e.g. not for C) might obey other rules. These rules are basically constraining  struct layouts to what can come out of a native compiler in the absence of pragma pack directives.

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PR Review Comment: https://git.openjdk.org/jdk/pull/14037#discussion_r1197121074