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The purpose of this module is to find which part of the program has been used by a certain goal. Usage is defined in terms of clauses for which the head unification succeeded. For each clause we count how often it succeeded and how often it failed. In addition we track all call sites, creating goal-by-goal annotated clauses.
This module relies on the SWI-Prolog tracer hooks. It modifies these hooks and collects the results, after which it restores the debugging environment. This has some limitations:
The result is represented as a list of clause-references. As the references to clauses of dynamic predicates cannot be guaranteed, these are omitted from the result.
diroption are specified.
### Clause was never executed. ++N Clause was entered N times and always succeeded --N Clause was entered N times and never succeeded +N-M Clause has succeeded N times and failed M times +N*M Clause was entered N times and succeeded M times
All call sites are annotated using the same conventions,
--- is used to annotate subgoals that were
true(default), add line numbers to the annotated file.