rr (with examples)

Recording an Application

To record an application using rr, you need to provide the path to the binary of the application and any necessary arguments.

Code Example:

rr record path/to/binary --arg1 --arg2

Motivation:

Recording an application using rr allows you to capture the program execution and any bugs or issues that may occur during that execution. It provides a way to reproduce the program state and investigate the root cause of any problems.

Explanation:

• path/to/binary: The path to the binary of the application that you want to record. This can be either an absolute path or a relative path.
• --arg1 --arg2: Any necessary command-line arguments that the application requires.

Example Output:

rr: Saved execution to trace.rr folder

After executing the command, rr will create a trace.rr folder that contains all the necessary information to replay the recorded execution.

Replaying the Latest Recorded Execution

To replay the latest recorded execution using rr, you simply need to execute the following command:

Code Example:

rr replay

Motivation:

Replaying a recorded execution allows you to step through the program’s execution, observe its behavior, and debug any issues that occurred during the recording. It provides a controlled environment for investigating and fixing bugs.

Explanation:

This command replays the latest recorded execution that was saved in the trace.rr folder. It loads the recorded program state and allows you to interactively debug the execution.

Example Output:

rr: Replaying recorded execution...

Program output:
Hello, World!

After executing the command, rr will start replaying the recorded execution step by step. In this example, the program outputs “Hello, World!” as it did during the original recording. You can interact with the program during replay to observe its behavior and debug any issues.

Conclusion

The rr command is a powerful tool for recording and replaying program execution. It allows you to capture and reproduce program states, investigate issues, and debug problems efficiently. By understanding how to use rr to record and replay applications, you can effectively analyze and resolve bugs in your software.