RFR: 7903632: struct accessor info is not derived from toplevel layout decl

[Jorn Vernee]

On Tue, 16 Jan 2024 16:14:31 GMT, Maurizio Cimadamore <mcimadamore at openjdk.org> wrote:

> This PR dials back the code generation updates a little when it comes to struct getter/setter, so that both their layouts and offsets is now derived from the toplevel struct layout - using layout paths, as before.
> 
> This allows clients to e.g. tweak layouts in a single place (the topelevel struct layout declaration) to adjust things such as endianness.

I think not creating the VarHandle is probably a bit better. We still end up generating the var handle for the field layout any way (since it's used in the MS getter/setter), but there is more chance of sharing the VarHandle with other use sites, since we don't bake in any offset computations.

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Marked as reviewed by jvernee (Committer).

PR Review: https://git.openjdk.org/jextract/pull/181#pullrequestreview-1824061343