一，工具简介
uflow工具用于跟踪方法的进入和退出事件，并打印一个可视化的流程图，显示方法是如何进入和退出的，类似于带有断点的跟踪调试器。这对于理解Java、Perl、PHP、Python、Ruby和Tcl等高级语言中的程序流非常有用，这些语言为方法调用提供了USDT探测。
二，代码示例
#!/usr/bin/python
from __future__ import print_function
import argparse
from bcc import BPF, USDT, utils
import ctypes as ct
import time
import os
languages = ["java", "perl", "php", "python", "ruby", "tcl"]
examples = """examples:
./uflow -l java 185 # trace Java method calls in process 185
./uflow -l ruby 134 # trace Ruby method calls in process 134
./uflow -M indexOf -l java 185 # trace only 'indexOf'-prefixed methods
./uflow -C '<stdin>' -l python 180 # trace only REPL-defined methods
"""
parser = argparse.ArgumentParser(
description="Trace method execution flow in high-level languages."