5.37 BCC工具之uflow.py解读

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/pythonfrom __future__ import print_functionimport argparsefrom bcc import BPF, USDT, utilsimport ctypes as ctimport timeimport oslanguages = ["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 '' -l python 180 # trace only REPL-defined methods"""parser = argparse.ArgumentParser(description="Trace method execution flow in high-level languages."