This script uses Clang to analyze C/C++ source code and provides information about functions in the codebase. It includes functionality to extract function details, identify functions called within a function, output start and end lines for each function, and compare the differences between any two functions.

Initially, I struggled to find a possible solution. I considered using regex and spent a significant amount of time developing regex patterns, but found that the approach was quite intricate. So, I looked for better solutions on the internet and was introduced to the libclang module.

• Documentation
• Further Reference
• difflib

With these tools and my previous knowledge, I have developed code for the analysis of the source code that essentially addresses the following:

• Functionality 1: Identify the function name, parameter types, and returned value types for each function.
• Functionality 2: Determine which other functions each function has called.
• Functionality 3: Output the start and end lines for each function.
• Functionality 4: Output the differences between any two functions.

• clang.cindex
• re
• sys
• difflib

1. Ensure you have the required libraries installed.
2. Run the script from the command line with the target C/C++ source code file as a command-line argument.

python script.py target_file.c

Function Details Extraction (extract_parameters_and_return): Extracts function name, parameter types, and return type using regular expressions. Function Calls Extraction (print_called_functions): Recursively prints functions called within a given function. Function Body Extraction (extract_function_body): Extracts the source code of a function. Function Comparison (compare_functions): Compares two function bodies using difflib and outputs the differences. Main Analysis (`if name == "main"):

• Parses the target file using Clang and stores the translation unit.
• Iterates over functions in the translation unit, extracting and printing information.
• Provides the option to compare the differences between any two functions.

• Ensure that the Clang library is properly installed and configured for the script to work correctly.
• This script serves as a tool for basic C/C++ code analysis and comparison of function implementations.
• Feel free to modify and adapt the code for your specific needs.

• I have used a command-line argument to pass the C/C++ file that has been provided.
• It iterates over all the functions.
• It provides the function names.
• If there are no parameters, it does not provide anything.
• Return values are included in the output.
• It lists the functions called within each function.
• It provides the start and end lines.
• I changed the functions in the C/C++ file, giving them parameters of int and double, and checked whether this code can properly generate output.

• The program prompts the user for the desired function number, and it continues iterating until the user provides valid input.

• I modified the C/C++ file to include two similar functions, aiming to observe if the comparison output highlights common values.