This is a step toward removing the index from `InitForm`, so that equal
form values always have equal representations.
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Co-authored-by: Jon Ross-Perkins <jperkins@google.com>
Implementation of unused pattern bindings #2022, continued.
Whereas previous PR #6460 took care of parsing, and PR #6479 prepared
the stage by using _ in some test cases, this PR has the the actual
implementation, using a simple dataflow analysis.
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Co-authored-by: Burak Emir <bqe@google.com>
Co-authored-by: jonmeow <jperkins@google.com>
This resolves a TODO in `expr_info.cpp` by using the inst kind rather
than the bound value to track the binding's category.
Since we're churning all the `bind_name` insts in testdata anyway, I'm
also taking this opportunity to align the inst naming with the design's
terminology, by calling these insts "bindings" (this aspect of the PR is
dependent on #6231 resolving an ambiguity in that terminology). For
consistency we'll need to rename several other insts as well (see the
TODO on `RefBinding`); I'm deferring that to a separate PR to minimize
the review load, but I think those name changes are in-scope for this
review.
We import C++ enum types as Carbon class types as adapters for the
corresponding builtin integer type, and we import enumerator constants
as integer constants of that class type.
No operators are supported on such values for now; eventually once we
start asking Clang to implement operators on C++-owned types, these
types should be handled in the same way. However, they can be converted
to the corresponding integer type with `as` via adapter conversion, and
integer builtin functions can operate on them.
Geoff Romer
Richard Smith