Self Compile Mechanism
void OpenJIT_compile(struct methodblock *mb) {
    COMPILE_LOCK(); /* for multi-threading */
    if (COMPILE_ON_THE_WAY(mb)) {
          /* avoid from double compiling */
      COMPILE_UNLOCK();
          mb->invoker(...); /* invoke interpreter */
      return;
    }
    SET_COMPILE_ON_THE_WAY(mb);
    /* this method should be temporarily interpreted */
    mb->invoker = gJDKfs invokerh;
    COMPILE_UNLOCK();
    /* compilation process */
    c
    /* next time, compiled code is direct called */
    mb->invoker = gcompiled codeh;
    RESET_COMPILE_ON_THE_WAY(mb);
    mb->invoker(c); /* jump into compiled code */
}