> The fields declaring layout support for value classes are duplicated across > the FieldLayoutBuilder, InlineKlass, and ClassFileParser. I suggest that we > move all of these into a new class, called AvailableLayouts. > > This rids us of many duplicated lines of code, and makes keeping the names > consistent easier (today, they are not consistent). > > For the design of `AvailableLayouts`, I decided on putting the size fields > into an array which is indexed by casting `LayoutKind` into an `int`. This > saves us code bloat, both in the repo, and also in our binaries. When I've > looked at the generated code for the inlined callsites of > `InlineKlass::layout_size_in_bytes`, the switch is compiled down into table > dispatch. Now, we can just have it be a load from an object offset. This > ought to be faster as well, as no prediction needs to take place. > > There's a lot of added `const` stuff in this PR as well, as issues with > const-correctness came up during the refactoring. > > --------- > - [X] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai).
Johan Sjölen has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 20 commits: - Merge remote-tracking branch 'origin/master' into simplify2 - Update src/hotspot/share/oops/layoutKind.hpp Co-authored-by: Stefan Karlsson <[email protected]> - Support reference layout - Rename to NoValue - Self-review - Final? - S390X - WIP - another one - Big endian fix - ... and 10 more: https://git.openjdk.org/jdk/compare/3e37fa3e...51e1de30 ------------- Changes: https://git.openjdk.org/jdk/pull/32276/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=32276&range=16 Stats: 575 lines in 35 files changed: 138 ins; 240 del; 197 mod Patch: https://git.openjdk.org/jdk/pull/32276.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/32276/head:pull/32276 PR: https://git.openjdk.org/jdk/pull/32276
