Systems and techniques are described for tracking software code paths. A described technique includes receiving a first log of stack traces that includes a respective stack trace for each of a plurality of calls to access any of a plurality of data objects created during a first execution of an application, generating, for each of the stack traces in the first log, a script for a respective probe that identifies the data object accessed by the call corresponding to the stack trace, a respective instruction called to access the data object, and whether the access is a read or a write access for the data object, generating, for at least one of the probes, a second log that identifies the data object for the respective probe and the data stored in the data object, and generating a representation of the execution of the application using the second log.