|Title:||Virtual Machine Based Debugging for occam-pi|
|Conference:||Communicating Process Architectures 2008|
Carl G. Ritson, Jonathan L. Simpson
Computing Laboratory, University of Kent
While we strive to create robust language constructs and design patterns
which prevent the introduction of faults during software development, an inevitable element
of human error still remains.We must therefore endeavor to ease and accelerate
the process of diagnosing and fixing software faults, commonly known as debugging.
Current support for debugging occam-pi programs is fairly limited. At best the developer is presented with a reference to the last known code line executed before their program abnormally terminated. This assumes the program does in fact terminate, and does not instead live-lock. In cases where this support is not sufficient, developers must instrument their own tracing support, “
In this paper we explore previous work in the field of debugging occam programs and introduce a new method for run-time monitoring of occam-pi applications, based on the Transterpreter virtual machine interpreter. By adding a set of extensions to the Transterpreter, we give occam-pi processes the ability to interact with their execution environment. Use of a virtual machine allows us to expose program execution state which would otherwise require non-portable or specialised hardware support. Using a model which bears similarities to that applied when debugging embedded systems with a JTAG connection, we describe debugging occam-pi by mediating the execution of one execution process from another.