This thesis presents the implementation of DEWLAP (DEbugging With
Logical APplications), a graphical debugger for Prolog. DEWLAP is
the first Prolog debugger to present program executions in an entirely
graphical fashion. Instead of showing source listings for program
tracing, DEWLAP displays the execution as a dynamically-changing tree.
This tree shows not only the currently-active sequence of goals, but
also the entire execution history. In this way, the user is provided
with a much more complete view of the execution than is possible with
other debuggers for Prolog or for any other language. A need for a
compromise between clarity of high-level information and accessibility
of low-level detail arises in a number of contexts. This problem is
solved in DEWLAP by giving the user the tools needed to tailor displays
and to focus attention on those parts of the execution tree which
are of current interest.
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