Python: Add exception, reachability, and other kinds of modelling#21668
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Python: Add exception, reachability, and other kinds of modelling#21668
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The implementation is essentially the same as the one from `BasicBlockWithPointsTo`, with the main difference being that this one uses the exception machinery we just added (and some extensions added in this commit).
Adds support for finding instances, and adds things like a `BaseException` convenience class.
Used for queries where we mention the class of a literal in the alert message.
Adds `if False: ...` and `if typing.TYPE_CHECKING: ...` to the set of nodes that are unlikely to be reachable.
Adds `maybeUndefined` to the reachability module, modelling which names/variables may be undefined at runtime. The approach is very close to the one used in points-to, though it of course relies on our new modelling of exceptions/reachability instead.
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A grab bag of infrastructure that is needed for the next bunch of queries to be ported.
Should be reviewed commit-by-commit.