RFR: 8242428: JVMTI thread operations should use Thread-Local Handshake

[Yasumasa Suenaga]

Hi all,

Please review this change:

   JBS: https://bugs.openjdk.java.net/browse/JDK-8242428
   webrev: http://cr.openjdk.java.net/~ysuenaga/JDK-8242428/webrev.00/

This change replace following VM operations to direct handshake.

  - VM_GetFrameCount (GetFrameCount())
  - VM_GetFrameLocation (GetFrameLocation())
  - VM_GetThreadListStackTraces (GetThreadListStackTrace())
  - VM_GetCurrentLocation

GetThreadListStackTrace() uses direct handshake if thread count == 1. In other case (thread count > 1), it would be performed as VM operation (VM_GetThreadListStackTraces).
Caller of VM_GetCurrentLocation (JvmtiEnvThreadState::reset_current_location()) might be called at safepoint. So I added safepoint check in its caller.

This change has been tested in serviceability/jvmti serviceability/jdwp vmTestbase/nsk/jvmti vmTestbase/nsk/jdi vmTestbase/ns
k/jdwp.

Also I tested it on submit repo, then it has execution error (mach5-one-ysuenaga-JDK-8242428-20200624-0054-12034717) due to dependency error. So I think it does not occur by this change.


Thanks,

Yasumasa