RFR: 8268829: Provide an optimized way to walk the stack with Class object only [v3]

[Mandy Chung]

On Wed, 23 Aug 2023 18:12:15 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Mandy Chung has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:
>> 
>>  - Replace NO_METHOD_INFO option with StackWalker.Kind enums
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into stackwalker-class
>>  - clean up
>>  - fix trailing whitespace
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into stackwalker-class
>>  - Update LocalLongHelper.java
>>  - clean up
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into stackwalker-class
>>  - Add StackWalker.Option.NO_METHOD_INFO
>>  - Merge branch 'master' of https://github.com/openjdk/jdk into stackwalker-class
>>  - ... and 6 more: https://git.openjdk.org/jdk/compare/ce1ded1a...434d90cb
>
> src/java.base/share/classes/java/lang/StackFrameInfo.java line 38:
> 
>> 36:         SharedSecrets.getJavaLangInvokeAccess();
>> 37: 
>> 38:     private final boolean retainClassRef;
> 
> Shouldn't `private final boolean retainClassRef` move to ClassFrameInfo? Isn't it strange that CLASS_INFO still implies RETAIN_CLASS_REFERENCE?

I was planning to move `retainClassRef` to `ClassFrameInfo` as a bit set in the `flags` field.   Thanks for catching this and reminding me to do that.  Now updated.

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PR Review Comment: https://git.openjdk.org/jdk/pull/15370#discussion_r1303501735