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Visualizing Type Error Messages

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Visualizing Type Error Messages. Allison Thompson CSCI 5535 Spring 2010. Motivation. This expression has type int but is here used with type float. This expression has type my_type but is here used with type my_type. Outline. Motivation Tools: Processing and S eminal ViSeR

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Visualizing Type Error Messages

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  1. Visualizing Type Error Messages Allison Thompson CSCI 5535 Spring 2010

  2. Motivation This expression has type int but is here used with type float This expression has type my_type but is here used with type my_type

  3. Outline • Motivation • Tools: Processing and Seminal • ViSeR • Conclusion

  4. Outline • Motivation • Tools: Processing and Seminal • ViSeR • Conclusion

  5. Pros and Cons of Processing • Easy • Didn’t require learning new language • Free • Based on Java 1.4.2 (limited) • Does not always run very fast • Visualization can take 4-5 sec to load; then 4-5 for each refresh

  6. Seminal: Searching for Error Messages INAdvanced Languages • Enumerate local changes to abstract syntax tree that may remove type errors • Search for places to try changes • Use type checker to evaluate changes • Rank changes and present to user

  7. Seminal Results: 1 + 2.5;; ------------------------------------------------------------------ File "test1.ml", line 1, characters 4-7: This expression has type float but is here used with type int Relevant code: 2.5 ------------------------------------------------------------------ File "test1.ml", line 1, characters 4-7: Try replacing 2.5 with 2.5; [[...]] of type int within context 1 + (2.5; [[...]]);; ============================== File "test1.ml", line 1, characters 2-3: Try replacing + with +; [[...]] of type int -> float -> 'a within context (1 +; [[...]] 2.5);; ============================== File "test1.ml", line 1, characters 4-7: Try replacing 2.5 with 2.5; [[...]] of type int within context 1 + (2.5; [[...]]);; wildcard replacement with type int

  8. Outline • Motivation • Tools: Processing and Seminal • ViSeR • Conclusion

  9. ViSeR: Visualization for Seminal Results • Goals: • Put Seminal suggestions in context with some form of helpful visualization • Minimize need for user to learn new symbols/etc – improve usability and understandability • Avoid re-introducing confusion: This expression has type int but is here used with type float

  10. ViSeR: Examples and Screenshots 1 + 2.5;; File "test1.ml", line 1, characters 4-7: Try replacing 2.5 with 2.5; [[...]] of type int within context 1 + (2.5; [[...]]);; wildcard replacement with type int This expression has type int but is here used with type float

  11. ViSeR: Examples and Screenshots actual error error location according to OCaml This expression has type int but is here used with type float

  12. Outline • Motivation • Tools: Seminal and Processing • ViSeR • Conclusion

  13. Conclusion • Success? • Put Seminal results in context • Provide improvement in usability • Remaining Issues/Future Work • ViSeR as a tool is limited/slow • Several situations doesn’t cover; doesn’t gracefully handle proper compilation • 4-5 seconds for some visualizations is too slow ✓ ✗

  14. Questions?

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