6CCS3VER - The Xchek Tool & KCL VM Installation or Linux and Mac Machines - IT Assignment Help

Assignment Task -                 

• Please make sure you read the instructions fully before you start implementing the  project. 

• The project is done on the Xchek tool, available as a part of the KCL VM installation or as a standalone software and it works on  Linux and Mac machines. 

• The final product of the project is the report accompanied by appropriate source code  files for the models and the sets of properties. The source code files should be written  in GCLang and compile in Xchek. Executing the properties should have the result  described in your report. 

• In the project, you will implement a system that simulates a counter (modulo 8 and  then modulo 16) interacting with the environment as a binary model for Xchek and a  set of properties. The stages of the project are as follows: 

1. Build a model for the counter that counts the number of times a variable  has the value 1 modulo 8 with binary variables in GCLang. In other words,  one of your variables should be a free variable, and the transitions of the  counter should depend on the value of this free variable. Keep in mind that  you will have to extend your model to a counter modulo 16 with minimum  changes to the code. 

2. Write an initial set of CTL properties to check correctness of your model.  Argue that the set represents the intuitive specification of what we can  expect from the counter. For each property, indicate whether it is a safety  property or a liveness property and explain why. 

3. Show that one of your properties passes vacuously in the system; explain  the reason for the vacuous pass and fix the model or the property. Clarification: answer “none of my properties pass vacuously” will not be  accepted – please have one of the properties passing vacuously. 

4. Introduce a bug in your model that is not caught by any of the properties. 

5. Explain why this happened and write an additional property that exposes  this bug. Demonstrate a counterexample. 

6. Does your initial model satisfy this additional property? If no, explain why  not and fix the model. 

7. Extend your model to a counter modulo 16 (that counts the number of  times the free variable has the value 1). Your initial design should have been general enough to allow this with a small number of changes. Explain  the changes. 

8. Out of the list of the properties you wrote, indicate which ones pass in  counter modulo 16 and which fail. If none fail, introduce a new property  that distinguishes between the counter modulo 8 and counter modulo 16  (that is, passes in one of them and fails in the other). 

• In your report, include figures of your models as Kripke structures. If the model is  too large, include a part of the figure and explain how the rest of the model looks  like. 

• Models that do not compile or do not run on Xchek will receive 0 for the relevant  subquestions (subquestions 1,3,4,5,6 for the model of counter modulo 8,  subquestion 7 for the model of counter modulo 16; for subquestion 8 both models  should compile and run). Properties that are grammatically incorrect and hence  cannot be understood by Xchek will lead to reduction in the mark (depending on  the number of grammatically incorrect properties). Reports without Kripke  structures will receive reduced marks for the matching subquestions 1. 

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