Help needed: Assembly not found

[Brixomatic]

• Using Windows 10

• Using JDK 15

  c:\Program Files\Java\jdk-15.0.1.9-hotspot\bin>java -version
  openjdk version "15.0.1" 2020-10-20
  OpenJDK Runtime Environment AdoptOpenJDK (build 15.0.1+9)
  OpenJDK 64-Bit Server VM AdoptOpenJDK (build 15.0.1+9, mixed mode, sharing)

• Downloaded hsdis-1.2.2-win32-amd64.zip (also tried hsdis-1.2.2-win32-x86.zip) from [https://sourceforge.net/projects/fcml/files/latest/download]() Copied hsdis.dll and hsdis.lib to c:\Program Files\Java\jdk-15.0.1.9-hotspot\bin\server

• Started jmh benchmark from MINGW64 Terminal like this:

  /c/"Program Files"/Java/jdk-15.0.1.9-hotspot/bin/java \
  -Xms1g -Xmx1g \
  -XX:+UnlockDiagnosticVMOptions -XX:+TraceClassLoading -XX:+LogCompilation \
  -XX:+DebugNonSafepoints -XX:LogFile=jvm.log \
  -jar target/benchmarks.jar 

• Started jitwatch using the same JDK:

  "c:\Program Files\Java\jdk-15.0.1.9-hotspot\bin\java" -jar jitwatch-ui-1.4.0-shaded-win.jar

• Added class files and directories in config, opened log and clicked "start"

• No assembly found for any method.

Overview:

[chriswhocodes]

Hi, I don't see -XX:+PrintAssembly in your start command?

[Brixomatic]

Hi, I don't see -XX:+PrintAssembly in your start command?

Hi, thanks for the quick reaction. Using -XX:+PrintAssembly I get some stuff, but it doesn't quite look like assembly and I get lots of "unknown instruction, assembly reference loaded?" popups:

[chriswhocodes]

Hi, that looks like the disassembler hasn't disassembled the native code back to readable mnemonics.

I've only had success using hsdis from GNU binutils with JITWatch so I'd recommend you try that?

It's fairly easy to build from OpenJDK sources even on Windows:

https://stackoverflow.com/questions/33903276/how-to-build-hsdis-dll-for-windows-32-bit

https://dropzone.nfshost.com/hsdis/

Cheers,

Chris

[Brixomatic]

Following the cygwin-tutorial on dropzone did the trick for me. Thanks a lot.