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Re: [tlaplus] Specifying an arbitrary function and then using it in TLC

On 25.11.20 10:31, Stephan Merz wrote:
CHOOSE is arbitrary but deterministic choice. In other words, with your definition, TLC will generate one function (likely a very trivial one, perhaps mapping every instruction of A to the same instruction of B) and explore the spec for that particular function. If you want to explore the spec for every possible function, make the mapping a variable of your spec, add

translateFn \in [...]

to the initial condition and UNCHANGED translateFn to all actions. And if you want to play with different hand-picked functions, add a CONSTANT TranslateFn to your module and write

ASSUME TranslateFn \in [...]

then you define the particular function in the model. What is the right way to go depends on whether you want to explore if your transpiler works for some fixed function, for all functions or for some specific ones.

With the new-ish Randomization module [1,2], you could trick TLC to check a more "interesting" subset of all functions.


[1] https://github.com/tlaplus/tlaplus/blob/master/tlatools/org.lamport.tlatools/src/tla2sany/StandardModules/Randomization.tla
[2] https://lamport.azurewebsites.net/tla/inductive-invariant.pdf

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