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Composition of specifications #132

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Composition of specifications #132

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Commits on Apr 6, 2024

  1. Add definition of OpenSpec that allows the variables inbox and 

    `count` to change independently of its next-state relation `Next`.  In
other words, we expect `inbox` and `count` to be shared variables with
another component/spec.

Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
    @lemmy
    lemmy committed Apr 6, 2024
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  2. Experiment with *extending* EWD998ChanID to add functionality to 

    shutdown/terminate nodes after termination *detection* by high-level
specs.

Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
    @lemmy
    lemmy committed Apr 6, 2024
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  3. *Refine* (not extend as in previous commit) the spec EWD998ChanID to add 

    shutdown functionality.

Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
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  4. Basic concept how two component specification can combined. 

    Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
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  5. If spec A has more than a one variable that does not appear in the other 

    spec, we unfortunately have to adapt the composition and create more
restsOfTheUniverse.

The next-state relation of this composition evaluates to false after the
initial state, because it defines variables z and zz to always have
equal values.  This is only satisfied in the special case where the
values of variables z and zz in A are equal throughout all behaviors
(e.g. Init changed to ... /\ zz = TRUE).

Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
    @lemmy
    lemmy committed Apr 6, 2024
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  6. Nothing to see/Removal of variable zz. 

    Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
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  7. If the composition of A and B is such that the every composite behavior 

    is the concatenation of a behavior defined by A and a behavior defined
by B, we won't need the variable `y`.  Instead, Spec is changed to use
ITE with ENABLED evaluated on the next-state relation of spec A.

Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
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  8. Compose Compute, Detect Termination (EWD998), and Shutdown. 

    Signed-off-by: Markus Alexander Kuppe <github.com@lemmster.de>
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