porting a benchmark into a different script

I need to port a certain benchmark into a different script so that I can use it with another code I have. The script I need is basically the sequences of reads and writes I can get from the benchmark, I want to break it all the way down to reads/writes/allocate/free. I honestly have no idea how to approach this. Any ideas on how to do so?

p.s: The benchmarks are in javascript.

Thank you for helping.