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diff --git a/content/zettel/3c3f1.md b/content/zettel/3c3f1.md new file mode 100644 index 0000000..77ea3d7 --- /dev/null +++ b/content/zettel/3c3f1.md @@ -0,0 +1,21 @@ ++++ +title = "Semantics of predicates in the abstract" +date = "2023-02-04" +author = "Yann Herklotz" +tags = [] +categories = [] +backlinks = ["3c3f"] +forwardlinks = ["3c3f2"] +zettelid = "3c3f1" ++++ + +In the abstract language, which is used to verify the schedules produced +by the scheduler, it also has to verify the equivalence of the +predicates. However, these predicates have rich semantics, because they +include expressions that are taken from the code during the symbolic +evaluation. This, however, means that these predicates do not always +evaluate to a value, as the context might not contain enough information +to evaluate an expression. In addition to that, it's not certain that +the expressions are free of undefined behaviour when they are evaluated +with an arbitrary context, which would mean that a division that was +safe in the input could suddenly become a division by 0. |