dbtools: A Sunview-Based Prolog Debugger

Debugging is very important in programming. A good software kit and environment are very helpful to software development In this paper, a Sunview-based Prolog debugger-dbtools is presented. It can provide not only normal debug method, such as execute step by step, execute to trap point, set or clear trap point at runtime, et al., but also explanatory debugging for Prolog.