Formal Verification (2016-17)

Formal verification is the use of mathematical techniques to verify the correctness of various kinds of engineering systems: software systems and digital hardware systems, for example. Formal verification techniques are exhaustive and provide much stronger guarantees of correctness than testing or simulation-based approaches. They are particularly useful for safety and security critical systems and for when system behaviour is highly complex. They are also now being used for some commercial software when bugs have a major impact on customer satisfaction. The course focuses on automated techniques that are currently used in industry. It gives practical exposure to current formal verification tools, explaining the input languages used and introducing the underlying mathematical techniques and algorithms used for automation.

Please see the DRPS course descriptor or the Path version of the course descriptor for a fuller description of the content of the course. Also Informatics provide a course summary.

This is a new course for 2016-17. New material on software verification is being developed.

On this page:

Staff

Lecturers:

Lab demonstrators: Daniel Raggi (First Part)

Course TA: Daniel Raggi (First Part)

Lecture Schedule

Lectures are held at 16.10-17.00 in Semester 2 on Tuesdays and Fridays in Room 2.13 of Old Infirmary (Geography), 1 Drummond Street, Edinburgh EH8 9XP.

The first lecture is on Tuesday 17th January 2017.

Note that there are no lecture notes for the course. Instead, recommended reading is associated with each lecture. This reading is usually from:

There will be one lecture on each of the formative, non-assessed practical exercises to provide some general information and background. Note: These lectures do not necessarily coincide with the hand-out dates for the practical sheets. Students should start work on their exercises soon as they are handed out rather than wait for the lectures, if these come later on.

Week Date Title Recommended Reading
1 Tue 17 Jan 2017 Course Overview
1. Introduction to Model Checking and Temporal Logic
H&R Sections 3.1, 3.2
Fri 20 Jan 2017 2. Linear Temporal Logic H&R Section 3.2
2 Tue 24 Jan 2017 3. The NuSMV model checker H&R Section 3.3
NuSMV Start-up Guide
Fri 27 Jan 2017 4. Practical Exercise See the Practical files
3 Tue 31 Jan 2017 5. Computation Tree Logic H&R Sections 3.4, 3.5, 3.6.1 and 3.7
Fri 3 Feb 2017 6. How LTL Model Checking Works
ltl-mc.smv
H&R Sections 3.6.2 and 3.6.3
4 Tue 7 Feb 2017 7. Introduction to Binary Decision Diagrams (BDDs) H&R Section 6.1
[background] An Introduction to Binary Decision Diagrams by Henrik Reif Andersen.
Fri 10 Feb 2017 8. Operations on BDDs H&R Sections 6.2, 6.3
5 Tue 14 Feb 2017 9. Discussion of the (Solutions to the) Practical Exercise See the handouts and some of the solutions already posted on the class class discussion forum
Fri 17 Feb 2017 10. No Lecture
  Tue 21 Feb 2017 Mid-Semester Break (no lecture)
Fri 24 Feb 2017 Mid-Semester Break (no lecture)
6 Tue 28 Feb 2017 11. No Lecture
Fri 3 Mar 2017 12. Introduction to second half of course
SPARK verification features - Part 1
7 Tue 7 Mar 2017 13. SPARK verification features - Part 2
Fri 10 Mar 2017 14. SPARK verification features - Part 3
8 Tue 14 Mar 2017 15. Programming language semantics Concrete Semantics by Nipkow and Klein: Sections 7.1, 7.2 and 12.4.
Fri 17 Mar 2017 16. SPARK tool-set Tutorial and video on Z3 SMT Solver and SMTLIB language
Why3 homepage
Why3 gallery
9 Tue 21 Mar 2017 17. WP-based methodology and tools
Fri 24 Mar 2017 18. SAT algorithms
10 Tue 28 Mar 2017 19. SAT & SMT algorithms
Fri 31 Mar 2017 20. Software bounded model checking with CBMC CBMC: Bounded Model Checking for ANSI-C An introduction to CBMC.
The CProver Suite of Verification Tools. Martin Brain. First part of a tutorial given at the FM 2016 conference
11 Tue 4 Apr 2017 21. Exam review for software verification material For exam questions on model checking see past papers from old Automated Reasoning course:
2011-12
2012-13
2013-14
2014-15
Fri 7 Apr 2017 22. No Lecture

Assessment and Coursework

Assessment is 100% based on a final exam. Several formative non-assessed practical exercises will be provided to give you familiarity with formal verification tools and help you better understand formal verification techniques. Demonstrators and your peers on the course will review your solutions to exercises and the lecturers will introduce the exercises and provide notes on the solutions.

Exercise 1
The first practical exercise involves model checking using NuSMV.
Exercises 2 & 3
For the first and second labs on checking assertions in the SPARK language, visit the SPARK lab page.
Exercise 4
For this exercise introducing the CBMC bounded model checker for C, visit the CBMC lab page.

Formal Verification Tools

Several formal verification tools will be used on this course. A possible set of tools is as follows. This set might well change as the course unfolds.

Labs

Lab sessions are held in Forrest Hill 1.B19 between 11:10 and 13:00 on Wednesdays. The lab sessions will start in Week 3, with no lab during the mid-semester break (20-24 Feb). At each lab session at least one of the course TAs, lecturers and/or demonstrators will be available to help with any problems with course material and coursework.

Help and Feedback

If you run into difficulties and are not making satisfactory progress then seek help. The earlier you ask for help the more likely it is that your problems can be solved without damaging your performance in the course. Do not be shy asking for help. This is a challenging course, which introduces you to novel techniques and skills. You are expected to learn them during the course, not to come already equipped with them.

To seek help

Even if you are managing fine, please feel free to use the discussion forum to ask questions on course-related topics that go beyond the core material presented in the lectures and courseworks.

Various kinds of feedback are provided during the course.


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