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Specifications

This directory contains specifications for various M3 components that are used for documentation and/or verification.

TLA+ Specifications

TLA+ specifications in this folder are written in PlusCal and then automatically translated into TLA+ and checked with the TLC model checker using the TLA+ toolbox.

Development instructions:

  1. Install and open the TLA+ toolbox TLA+ toolbox.
  2. Click File and then Open Spec and finally Add New Spec.
  3. Name the file / module exactly the same as it is named in the MODULE declaration of the top of the specification you wish to run.
  4. Paste the specification into the code editor.
  5. Click TLC Model Checker then New Model and name the model whatever you want.
  6. In the Model Overview section, specify the values of any pre-declared constants. Review the comments in the specification for guidance on choosing values. When in doubt, pick small values that limit the search space of the model checker and gradually increase them after measuring how long it takes the model checker to evaluate the specification.
  7. Add any named invariants to the Invariants section under the What to check? panel in the Model Overview tab. By convention, these invariants are listed at the bottom of the specification, underneat the auto-generated TLA+ translation.
  8. Click the green play symbol to check the model.

Note that if you change the PlusCal algorithm you will need to regenerate the TLA+ translation by clicking File and then Translate PlusCal Algorithm.