hg clone http://hg.openjdk.java.net/jdk8u/jdk8u/
  cd jdk8u
  sh ./get_source.sh
  sh ./configure --with-debug-level=slowdebug --disable-zip-debug-info

• - -XX:+UnlockExperimentalVMOptions
• - -Xprintflags
• - -XX+PrintFlagsWithComments
• - -XX:+PrintFlagsInitial
• - -XX:+PrintFlagsFinal
• - -XX:+CountBytecodes
• - -XX:+PrintBytecodeHistogram
• - -XX:+Printinterpreter
• - -XX:+TraceBytecodes
• - -XX:StopInterpreterAt=<num printed by -XX:+TraceBytecodes>
• - set `b breakpoint` at GDB
• - -XX:CompileCommand=“break <className:method>”
• - -XX:CompileCommand=“print <className:method>”

This requires hsdis:

  cd hotspot/src/share/tools/hsdis/
  wget http://ftp.gnu.org/gnu/binutils/binutils-2.33.1.tar.xz
  tar xvf binutils-2.33.1.tar.xz
  make all64 BINUTILS=binutils-2.33.1
  cp build/linux-amd64/hsdis-amd64.so /same/path/to/libjvm.so
  ./java -XX:+PrintInterpreter Hello

• - `call help()`
• - `call pns($sp, $rbp, $pc)`

http://www.progdoc.de/papers/JavaOne2014/javaone2014_con3138.html