RFR: 8262889: Compiler implementation for Record Patterns [v7]
Jan Lahoda
jlahoda at openjdk.java.net
Wed May 25 04:20:35 UTC 2022
> 8262889: Compiler implementation for Record Patterns
>
> A first version of a patch that introduces record patterns into javac as a preview feature. For the specification, please see:
> http://cr.openjdk.java.net/~gbierman/jep427+405/jep427+405-20220426/specs/patterns-switch-record-patterns-jls.html
>
> There are two notable tricky parts:
> -in the parser, it was necessary to improve the `analyzePattern` method to handle nested/record patterns, while still keeping error recovery reasonable
> -in the `TransPatterns`, the desugaring of the record patterns is very straightforward - effectivelly the record patterns are desugared into guards/conditions. This will likely be improved in some future version/preview
>
> `MatchException` has been extended to cover additional cases related to record patterns.
Jan Lahoda has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 34 commits:
- Merge branch 'master' into patterns-record-deconstruction3
- Post merge fix.
- Merge branch 'master' into patterns-record-deconstruction3
- Fixing (non-)exhaustiveness for enum.
- Merge branch 'type-pattern-third' into patterns-record-deconstruction3
- Merge branch 'master' into type-patterns-third
- Using Type.isRaw instead of checking the AST structure.
- Exhaustiveness should accept supertypes of the specified type.
- Renaming the features from deconstruction pattern to record pattern.
- Fixing guards after record patterns.
- ... and 24 more: https://git.openjdk.java.net/jdk/compare/742644e2...f49d3f0a
-------------
Changes: https://git.openjdk.java.net/jdk/pull/8516/files
Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8516&range=06
Stats: 2255 lines in 50 files changed: 2169 ins; 15 del; 71 mod
Patch: https://git.openjdk.java.net/jdk/pull/8516.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/8516/head:pull/8516
PR: https://git.openjdk.java.net/jdk/pull/8516
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