git: openjdk/jdk: master: 8336856: Efficient hidden class-based string concatenation strategy

[Claes Redestad]

Changeset: 5022109b
Branch: master
Author:    Shaojin Wen <shaojin.wensj at alibaba-inc.com>
Committer: Claes Redestad <redestad at openjdk.org>
Date:      2024-08-16 13:18:02 +0000
URL:       https://git.openjdk.org/jdk/commit/5022109b2a33a8cf2608eb829098b27641b731a4

8336856: Efficient hidden class-based string concatenation strategy

Co-authored-by: Claes Redestad <redestad at openjdk.org>
Reviewed-by: redestad, liach

! src/java.base/share/classes/java/lang/StringConcatHelper.java
! src/java.base/share/classes/java/lang/System.java
! src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java
! src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java
! src/java.base/share/classes/jdk/internal/util/ClassFileDumper.java
+ test/jdk/java/lang/String/concat/HiddenClassUnloading.java
! test/micro/org/openjdk/bench/java/lang/StringConcat.java
! test/micro/org/openjdk/bench/java/lang/StringConcatStartup.java