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====== Build ======


<code>
  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
</code>

====== Options ======

  * - -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>"

====== Template Intepreter ======


This requires hsdis:

<code>
  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
</code>

====== GDB ======

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

====== Reference ======

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