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[Civl] Anonymous actions in refinement specification of yield procedures #972

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merged 1 commit into from
Oct 24, 2024

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shazqadeer
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@shazqadeer shazqadeer commented Oct 23, 2024

It is occasionally tedious to invent names of atomic actions whose only purpose is to serve as refinement specification of a yield procedure. This PR enables such specifications to be specified via anonymous actions. The new test file added in this PR provides a good illustration.

@shazqadeer shazqadeer merged commit 35ed12b into master Oct 24, 2024
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menesro commented Oct 24, 2024

Yes, I like it. It is also easier to read the file because the atomic specification is close to the yield procedure.

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Nice feature! Combines the convenience of the original Civl implementation with the flexibility of named actions.

right action {:layer 1, 9} Atomic_Mutex_Alloc() returns ({:linear} one_loc_l: One Loc)
modifies MutexPool;
yield procedure {:layer 0} Mutex_Alloc() returns ({:linear} one_loc_l: One Loc);
refines right action {:layer 1, 9} _
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How hard would it be to eliminate the name from the grammar in the anonymous case? My understanding is that anything can be put, which might be confusing.

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It is so hard that I don't even know how to do it right now :-). The problem is that I need to allow attributes as well as the action body both of which begin with {. Take a look at BoogiePL.atg when you find some time. In any case, the convention of using _ for the name of the anonymous action feels nice to me.

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The current behavior is that the name of the anonymous action could be an arbitrary string (including _) but it is thrown away and an internally generated name is used. There is one other option: use the supplied name if it is different from _ but generate an internal name if it is _.

Any preference?

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3 participants