RFR: 8273000: Remove WeakReference-based class initialisation barrier implementation [v3]
Vladimir Ivanov
vlivanov at openjdk.java.net
Thu Sep 2 11:45:01 UTC 2021
> Get rid of WeakReference-based logic in DirectMethodHandle::checkInitialized() and reimplement it with `Unsafe::ensureClassInitialized()`/`shouldBeInitialized()`.
>
> The key observation is that `Unsafe::ensureClassInitialized()` does not block the initializing thread.
>
> Also, removed `Unsafe::shouldBeInitialized()` in `DMH::shouldBeInitialized(MemberName)` to save on calling into the VM.
> `Unsafe::ensureClassInitialized()` already has a fast-path check which checks whether the class is fully initialized or not.
>
> Testing: tier1 - tier6
Vladimir Ivanov has updated the pull request incrementally with one additional commit since the last revision:
Update the comment
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Changes:
- all: https://git.openjdk.java.net/jdk/pull/5258/files
- new: https://git.openjdk.java.net/jdk/pull/5258/files/64f2de83..09c36317
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5258&range=02
- incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5258&range=01-02
Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
Patch: https://git.openjdk.java.net/jdk/pull/5258.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/5258/head:pull/5258
PR: https://git.openjdk.java.net/jdk/pull/5258
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