code: private File extract(InstrumentsVersion version) {
      if (version.getBuild() == null) {
        throw new WebDriverException("you are running a version of XCode that is too old " + version);
      }
  
      extractFromJar("instruments");
      extractFromJar("InstrumentsShim.dylib");
      extractFromJar("ScriptAgentShim.dylib");
      if (version.getMajor() >= 6) {
        extractFromJar("DTMobileISShim.dylib");
      }
      extractFromJar("SimShim.dylib");
      extractFromJar("README");
      File instruments = new File(workingDirectory, "instruments");
      instruments.setExecutable(true);
      return instruments;
    }
docs: extract the binaries for the specified version of instruments.