1 Reply Latest reply: Dec 25, 2011 5:00 PM by rp0428 RSS

    how to dump intermediate representation of code?

      Hello dear community,

      I got an interesting question, just out of my curiosity... reading a book about jRockit I saw examples how java program is transformed and how it looks (java code -> byte code -> HIR -> MIR -> etc), and all the time authors provided real code, or better to say how that code looks at different stages of transformation. I also saw the same examples in internet (like here: http://ssw.jku.at/Research/Papers/Wimmer04Master/Wimmer04Master.pdf - pages 36, 44, ...)
      The question is what should I use (either external dumper or JVM parameters) to see the same for my custom code? I heard that it is possible, but I can't find it in the Internet. Again, I'm asking just to understand better what is done by JVM, how it works etc.

      thank you for any hints,
        • 1. Re: how to dump intermediate representation of code?
          The 'javap' utility (type 'javap -help') that comes with Java can disassemble class files. You can also use Java decompilers that you find on the web: JDGUI, JAD and others.

          The Java Virtual Machine Specification (e.g. http://java.sun.com/docs/books/jvms/second_edition/html/VMSpecTOC.doc.html) explains the instruction set and structure.