RFR: 8331291: java.lang.classfile.Attributes class performs a lot of static initializations [v5]

Adam Sotona asotona at openjdk.org
Mon May 6 13:59:19 UTC 2024


> Hi,
> During performance optimization work on Class-File API as JDK lambda generator we found some static initialization killers.
> One of them is `java.lang.classfile.Attributes` with tens of static fields initialized with individual attribute mappers, and common set of all mappers, and static map from attribute names to the mappers.
> 
> I propose to turn all the static fields into lazy-initialized static methods and remove `PREDEFINED_ATTRIBUTES` and `standardAttribute(Utf8Entry name)` static mapping method from the `Attributes` API class.
>  
> Please let me know your comments or objections and please review the [PR](https://github.com/openjdk/jdk/pull/19006) and [CSR](https://bugs.openjdk.org/browse/JDK-8331414), so we can make it into 23.
> 
> Thank you,
> Adam

Adam Sotona has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains ten commits:

 - updated LimitsTest
 - Merge branch 'master' into JDK-8331291-attributes
   
   # Conflicts:
   #	test/jdk/jdk/classfile/SignaturesTest.java
 - Merge branch 'master' into JDK-8331291-attributes
 - changed order in allowed modules attributes check
 - added bug number
 - added impl comment
 - removed list of predefined attributes
   standard attributes mapping hard-coded and moved to BoundAttribute
   added AttributesTest::testAttributesMapping
 - move mappers implementations to AbstractAttributeMapper
 - 8331291: java.lang.classfile.Attributes class performs a lot of static initializations

-------------

Changes: https://git.openjdk.org/jdk/pull/19006/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19006&range=04
  Stats: 2032 lines in 48 files changed: 905 ins; 619 del; 508 mod
  Patch: https://git.openjdk.org/jdk/pull/19006.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19006/head:pull/19006

PR: https://git.openjdk.org/jdk/pull/19006


More information about the hotspot-compiler-dev mailing list