[foreign-jextract] RFR: Add MemoryLayout::byteOffset

[Jorn Vernee]

On Mon, 11 May 2020 08:30:40 GMT, Chris Hegarty <chegar at openjdk.org> wrote:

> Hi,
> 
> As part of feedback on the Foreign Memory API (when experimenting with
> its usage internally in the JDK), a small number of potential usability
> enhancements could be made to the API. This is the first such.
> 
> This change:
>  1) renames MemoryLayout::offset to MemoryLayout::bitOffset, and
>  2) adds MemoryLayout::byteOffset
> 
> This allows for easier interoperation with MemoryAddress, which deals
> with offsets and lengths in terms of bytes (rather than bits), e.g.
>    addr.addOffset(layout.byteOffset(groupElement("foo")))
> 
> This brings a nice symmetry to the API; there is a trio of bit-wise
> methods: bitAlignment, bitOffset, bitSize, and their matching byte-wise
> counterparts; byteAlignment, byteOffset, byteSize.

This seems like it should go to the `foreign-memaccess` branch, but is currently targeting the `foreign-jextract`
branch. If you click the "Edit" button on the right next to the title of the PR, you should be able to change the
target branch from the drop-down just below the PR title.

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PR: https://git.openjdk.java.net/panama-foreign/pull/157