RFC (csr): 8225142: JVMTI spec incorrectly states that PopFrame can not be called on the current thread

[serguei.spitsyn at oracle.com]

Hi All,

Please comment or.and review the following CSR.

The CSR:
   https://bugs.openjdk.java.net/browse/JDK-8225142

The bug:
   https://bugs.openjdk.java.net/browse/JDK-8205126

Updated JVMTI spec:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8205126-jvmti-spec-popframe.1/jvmti.html


Specdiff:
http://cr.openjdk.java.net/~sspitsyn/webrevs/2019/8205126-jvmti-spec-popframe.1/jvmti-specdiff/


Summary:
   The JVMTI PopFrame() spec does not match the implementation.
   It says the  specified thread can not be the current thread.
   The fix aligns:
    - spec with implementaion
    - PopFrame spec with ForceEarlyReturn spec

Thanks,
Serguei
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