In preparation for some flow anaylsis work I intend to do this month,
I want to make the flow analysis unit tests easier to understand and
maintain. This CL creates an AST representation that models just
enough of the Dart language to be able to do flow analysis testing, so
that when reading or writing a flow analysis unit test, instead of
having to remember the correct sequence of calls to FlowAnalysis to
model a given construct, you can just create a mini-AST representation
of the given construct and pass it to the flow analysis test harness.
The mini-AST model for expressions contains methods that can be used
to build larger expressions out of smaller ones, so a lot of code can
be modeled compactly. For example, to create a mini-AST model of the
statement `x = y && z == null;`, call
`x.write(y.read.and(z.read.eq(nullLiteral()))).stmt`.
Change-Id: I11e3882078fdc5797176019398db48011232cf35
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/174560
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
Paul Berry
1779cc86d2