RFR: 8364929: Assign unique id to each AdapterBlob stored in AOTCodeCache

Ashutosh Mehra asmehra at openjdk.org
Mon Sep 29 16:28:54 UTC 2025


This patch assigns unique id to each AdapterHandlerEntry so as to avoid using hash computed from AdapterFingerPrint which may not be unique. Unique id allows AOTCodeCache to locate the AdapterBlob being requested to be loaded.

Testing:
Before this patch `runtime/cds/appcds/aotClassLinking/StringConcatStress.java` emits warning messages in the production run:

[0.009s][warning][aot,codecache,stubs] Saved blob's name 'LIIDIIIDL' is different from the expected name 'LIIDIIDL'
[0.009s][warning][aot                ] Failed to link AdapterHandlerEntry (fp=LIIDIIDL) to its code in the AOT code cache
[0.009s][warning][aot,codecache,stubs] Saved blob's name 'IILLLLIIIIII' is different from the expected name 'IILLLLLILIII'
[0.009s][warning][aot                ] Failed to link AdapterHandlerEntry (fp=IILLLLLILIII) to its code in the AOT code cache

With this patch, such warnings are not seen at all

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

Commit messages:
 - 8364929: Assign unique id to each AdapterBlob stored in AOTCodeCache

Changes: https://git.openjdk.org/jdk/pull/27553/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27553&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364929
  Stats: 30 lines in 2 files changed: 14 ins; 1 del; 15 mod
  Patch: https://git.openjdk.org/jdk/pull/27553.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27553/head:pull/27553

PR: https://git.openjdk.org/jdk/pull/27553


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