> This is a "*sub-review pull request*" for the first > [preview](https://openjdk.org/jeps/12) of [JEP 401: Value Classes and > Objects](https://openjdk.org/jeps/401), specifically > [JDK-8317279](https://bugs.openjdk.org/browse/JDK-8317279): Standard library > implementation of value classes and objects > >> [!NOTE] >> This pull request and the other sub-review pull requests listed below are >> based on the "*master pull request*" >> (https://github.com/openjdk/jdk/pull/31120). It contains the same full set >> of code changes as the "*master pull request*" to preserve the full >> implementation context; the language compiler, JVM, and standard library >> changes are intertwined. This separate pull requests exist only to subdivide >> the review and related discussion by area. > > Other areas for review: > > - [JDK-8317277](https://bugs.openjdk.org/browse/JDK-8317277): Java language > implementation of value classes and objects > - https://github.com/openjdk/jdk/pull/31121 > - [JDK-8317278](https://bugs.openjdk.org/browse/JDK-8317278): JVM > implementation of value classes and objects > - https://github.com/openjdk/jdk/pull/31122 > > Code changes resulting from the review process should be made in > [`valhalla/lworld`](https://github.com/openjdk/valhalla/). > > `valhalla/lworld` is currently updated from `jdk/master` whenever a weekly > [`jdk` tag](https://github.com/openjdk/jdk/tags) is created. At that time, > code changes from `valhalla/lworld` will be propagated to the master pull > request and to all sub-review pull requests, including this one. > > Ultimately, review sign-off will be recorded on the "*master pull request*", > and this pull request will be closed without integration. > > This pull request has a large code surface area and often conflicts with > `jdk/master` on a daily basis. Refer to > [`valhalla/lworld`](https://github.com/openjdk/valhalla/) for the latest > state of the project code, keeping in mind that it may lag several days > behind `jdk/master`. Both repositories may be needed as references during > review. > > # PR implementation description > > Here's a high-level overview of what's included here. > > ### Core object behaviors > > Introduced `Objects` methods to test for identity and `IdentityException` for > test failures; revised definitions of `==` and `identityHashCode` to work on > the > fields of value objects. > > - `src/java.base/share/classes/java/lang` > - `src/java.base/share/classes/java/util` > - `src/java.base/share/classes/java/lang/runtime` > - `test/jdk/java/util` > - `test/jdk/valhalla/valuetypes` > - `test/micr...
David Simms has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 2822 commits: - Merge branch '8317277' into jep401_sub_review_8317279 - Merge remote-tracking branch 'valhalla/lworld' into 8317277 - 8386690: [lworld] cherry-pick JDK-8386124 Test serviceability/sa/TestG1HeapRegion.java failed: Address of G1HeapRegion does not match Reviewed-by: liach - 8385743: [lworld] investigate and address build related comments in the Valhalla PR Reviewed-by: liach, erikj - 8376346: [lworld] Basic Shenandoah support Reviewed-by: qamai - 8386598: [lworld] C1 acmp profiling fix and minor cleanup Reviewed-by: mchevalier - 8386618: [lworld] Remove unused entry_guard_Relocation Reviewed-by: chagedorn, jsjolen, jsikstro - Merge Merge jdk-28+2 - 8386623: [lworld] Cleanup module support for system modules in JDK exploded build with preview resources Reviewed-by: liach - 8386316: [lworld] Replace Valhalla since version with 28 Reviewed-by: darcy - ... and 2812 more: https://git.openjdk.org/jdk/compare/6def7d55...426cc065 ------------- Changes: https://git.openjdk.org/jdk/pull/31123/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31123&range=04 Stats: 204842 lines in 1840 files changed: 192261 ins; 3575 del; 9006 mod Patch: https://git.openjdk.org/jdk/pull/31123.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31123/head:pull/31123 PR: https://git.openjdk.org/jdk/pull/31123
