import sun.jvm.hotspot.runtime.CompiledVFrame; //导入依赖的package包/类
public void doit(Tokens t) {
    if (t.countTokens() != 0) {
        usage();
    } else {
        ArrayList nmethods = new ArrayList();
        Threads threads = VM.getVM().getThreads();
        HTMLGenerator gen = new HTMLGenerator(false);
        for (JavaThread thread = threads.first(); thread != null; thread = thread.next()) {
            try {
                for (JavaVFrame vf = thread.getLastJavaVFrameDbg(); vf != null; vf = vf.javaSender()) {
                    if (vf instanceof CompiledVFrame) {
                        NMethod c = ((CompiledVFrame)vf).getCode();
                        if (!nmethods.contains(c)) {
                            nmethods.add(c);
                            out.println(gen.genHTML(c));
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}