C++ function call document generation: parameter passing and automatic generation of return values

By utilizing the C reflection mechanism, this article provides a solution for automatically generating C function call documents, which can extract parameter transfer and return value information from function signatures, and generate detailed Markdown documents containing function parameters. (pass by value/reference), return value type, and parameter description.

C function call document generation: parameter transfer and automatic generation of return values

Introduction

In large C projects, writing comprehensive and accurate documentation is critical, especially for function calling conventions. Maintaining such documentation manually is time-consuming and error-prone. To simplify this process, this article introduces a solution to automatically generate C function call documentation.

Solution

Our solution leverages the C reflection mechanism to extract information about parameter passing and return values ​​from the function signature. We implemented two main components:

• FunctionCallExtractor: Class that extracts function calls from the assembly.
• DocumentationGenerator: Generate a Markdown document using the extracted call information.

Practical Case

To demonstrate this solution in action, we created a practical case containing the following function:

void Foo(int num, const std::string& str);
int Bar(double a, bool b);
std::vector<int> Baz(const int& i, std::vector<bool>& vec);

Document generation

Using our solution, we can automatically generate the following Markdown document:

## Foo

**参数：**

* `num`: 传递按值传递的整数
* `str`: 传递按引用传递的字符串

**返回值：**

无

## Bar

**参数：**

* `a`: 传递按值传递的双精度浮点数
* `b`: 传递按值传递的布尔值

**返回值：**

整数值

## Baz

**参数：**

* `i`: 传递按引用传递的整数（const int&）
* `vec`: 传递按引用传递的布尔值向量（std::vector<bool>&）

**返回值：**

按值传递的整数向量

Conclusion

Introduction to this article The solution significantly improves the documentation quality of large projects by automating the generation of C function call documentation. By leveraging the reflection mechanism, we can easily extract information about parameter passing and return values, providing developers with clear and comprehensive documentation of calling conventions.

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