I worked for a company in Ireland called Piercom, where a research project from the University of Limerick was commercialized. Its now called Inspect.

I was focused on the DEC (as was) compiler suite, though others were supported. After analysis you could track the flow of information through an application that could be a pure or mixed COBOL, PASCAL, FORTRAN (bane of my life), C, etc legacy application and use it to help re-design or upgrade it.

There were a suite of tools to help you track variables and structures through the whole application. No mean feat i can tell you.

In the 1990's its main market was Y2k analysis, and it was the best in the world at the time, all the competition had was crude code scanners. IIRC the COBOL analyzer was awarded a Smithsonian innovation medal.

I moved on before 2000, but they still have the product.

http://www.piercom.ie/Products.taf?_UserReference=54ACC99EE8F1031645A2A4CC