[custom-descriptors] Branching descriptor casts #7622
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Implement basic support for `br_on_cast_desc` and `br_on_cast_desc_fail` as new variants of `BrOn`. Include binary and text parsing and printing as well as validation. Also handle the new operations anywhere the compiler would otherwise complain about a non-exhaustive switch over the `BrCastOp` enum. For validation of type immediates during parsing, relax the requirement that the cast type is a subtype of the input type. Continue validating in the IR that the non-descriptor branching casts are downcasts, but do not validate this for the new descriptor casts. See WebAssembly/custom-descriptors#37 for context. Add new validation and parsing tests in the form of spec tests in preparation for creating an upstream spec test suite. While we're at it, move the ref.get_desc tests to spec tests, add a few test cases, and fix a bug when the ref.get_desc operand is null.
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Implement basic support for
br_on_cast_descandbr_on_cast_desc_failas new variants of
BrOn. Include binary and text parsing and printingas well as validation. Also handle the new operations anywhere the
compiler would otherwise complain about a non-exhaustive switch over the
BrCastOpenum.For validation of type immediates during parsing, relax the requirement
that the cast type is a subtype of the input type. Continue validating
in the IR that the non-descriptor branching casts are downcasts, but do
not validate this for the new descriptor casts. See
WebAssembly/custom-descriptors#37 for context.
Add new validation and parsing tests in the form of spec tests in
preparation for creating an upstream spec test suite. While we're at it,
move the ref.get_desc tests to spec tests, add a few test cases, and fix
a bug when the ref.get_desc operand is null.