RFR: 8335743: jhsdb jstack cannot print some information on the waiting thread [v2]

[KIRIYAMA Takuya]

> This bug was introduced by JDK-8284161. "Object.wait (long timeoutMillis)" was changed to call "Object.wait0 (long timeoutMillis)" in JDK-8284161.
> 
> When "jhdsb jstack" is executed, the stack and lock information are printed in "sun.jvm.hotspot.runtime.JavaVFrame.printLockInfo(PrintStream tty, int frameCount)". This method checks whether the method is java.lang.Object.wait (...) and then reports the waitstate only if the check passes.
> https://github.com/openjdk/jdk/blob/7bc8f9c150cbf457edf6144adba734ecd5ca5a0f/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/runtime/JavaVFrame.java#L103
> 
> 
>       if (getMethod().getName().asString().equals("wait") &&
>           getMethod().getMethodHolder().getName().asString().equals("java/lang/Object")) {
> 
> 
> However, after JDK-8284161, the waiting thread waits on "java.lang.Object.wait0 (long timeoutMillis)", so it no longer reports the waitstate.
> 
> I changed "printLockInfo(PrintStream tty, int frameCount)" to check for "java.lang.Object.wait0 (...)".
> I confirmed that the lock information is correctly printed with this fix.
> I tested hotspot/jtreg/serviceability/sa/ and jdk/sun/tools/jhsdb/heapconfig/, and there were no regressions by this fix.
> 
> Would anyone review this change, please?

KIRIYAMA Takuya has updated the pull request incrementally with one additional commit since the last revision:

  8335743: jhsdb jstack cannot print some information on the waiting thread

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/20049/files
  - new: https://git.openjdk.org/jdk/pull/20049/files/1daff6fa..8ebc2b4b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20049&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20049&range=00-01

  Stats: 5 lines in 1 file changed: 1 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/20049.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20049/head:pull/20049

PR: https://git.openjdk.org/jdk/pull/20049