Moped (a portable debugger)

Moped is a portable debugger that uses enhanced tracing facilities and backtracing to discover unusual or undesirable program behaviors. It is based upon two modules - Program Probes and Program. History, each providing different abilities. Program Probes is a forward tracing utility which allows Moped to dynamically examine the execution of a program. Program. History is a backtracing utility which allows Moped to study the executed section of a program. Together, Program Probes and Program. History enable Moped to have more control over the behavior of a program than either one of them, and consequently to provide an easier path toward program debugging. Moped is written in Common LISP with no dependencies on details of the language or machine implementation. Therefore, it is portable to any Common LISP environment.