RFR: 8261090: Store old classfiles in static CDS archive

Calvin Cheung ccheung at openjdk.java.net
Wed Apr 14 00:30:03 UTC 2021


Please review this RFE for storing old classfiles with major version < 50 in static CDS archive.
During static CDS dump time, old classes won't be verified/rewritten. They will be verified/rewritten during runtime.
Therefore, the `_constMethod`, `_constants`, and `_cache` of old classes must be stored in the RW region of the archive for runtime rewriting. The `ConstantPool::remove_unshareable_info` will be skipped during dump time and the `ConstantPool::restore_unshareable_info` will be skipped during runtime for old classes.

Passed tiers 1,2,3,4 tests on mach5.

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Commit messages:
 - remove extraneous whitespace
 - Merge branch 'master' into 8261090-store-old-classfiles
 - add comments and some code simplification
 - 8261090: Store old classfiles in static CDS archive

Changes: https://git.openjdk.java.net/jdk/pull/3479/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3479&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8261090
  Stats: 894 lines in 28 files changed: 852 ins; 16 del; 26 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3479.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3479/head:pull/3479

PR: https://git.openjdk.java.net/jdk/pull/3479


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