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Remove support for the "struct_subtype", "array_subtype", "func_subtype", and
"extends" notations we used at various times to declare WasmGC types, leaving
only support for the standard text fromat for declaring types. Update all the
tests using the old formats and delete tests that existed solely to test the old
formats.
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Match the spec and parse the shorthand binary and text formats as final and emit
final types without supertypes using the shorthands as well. This is a
potentially-breaking change, since the text and binary shorthands can no longer
be used to define types that have subtypes.
Also make TypeBuilder entries final by default to better match the spec and
update the internal APIs to use the "open" terminology rather than "final"
terminology. Future changes will update the text format to use the standard "sub
open" rather than the current "sub final" keywords. The exception is the new wat
parser, which supporst "sub open" as of this change, since it didn't support
final types at all previously.
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Use the standard "(sub $super ...)" format instead of the non-standard
"XXX_supertype ... $super" format. In a follow-on PR implementing final types,
this will allow us to print and parse the standard text format for final types
right away with a smaller diff.
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These tests were easy to remove --nominal from because they already worked with
the standard type system as well.
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This makes Binaryen's default type system match the WasmGC spec.
Update the way type definitions without supertypes are printed to reduce the
output diff for MVP tests that do not involve WasmGC. Also port some
type-builder.cpp tests from test/example to test/gtest since they needed to be
rewritten to work with isorecursive type anyway.
A follow-on PR will remove equirecursive types completely.
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Without this roundtripping may not work in nominal mode, as
we might not assign the expected heap types in the right places.
Specifically, when the signature matches but the nominal types are
distinct then we need to keep them that way (and the sugar in the
text format parsing will merge them).
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Switch from "extends" to M4 nominal syntax
Change all test inputs from using the old (extends $super) syntax to using the
new *_subtype syntax for their inputs and also update the printer to emit the
new syntax. Add a new test explicitly testing the old notation to make sure it
keeps working until we remove support for it.
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Add a new run line to every list test containing a struct type to run the test
again with nominal typing. In cases where tests do not use any struct subtyping,
this does not change the test output. In cases where struct subtyping is used, a
new check prefix is introduced to capture the difference that `(extends ...)`
clauses are emitted in nominal mode but not in equirecursive mode. There are no
other test differences.
Some tests are cleaned up along the way. Notably,
O_all-features{,-ignore-implicit-traps}.wast is consolidated to a single file.
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The tail call spec does not include subtyping because it is based on the
upstream spec, which does not contain subtyping. However, there is no reason
that subtyping shouldn't apply to tail calls like it does for any other call or
return. Update the validator to allow subtyping and avoid a related null pointer
dereference while we're at it.
Do not run the test in with --nominal because it is buggy in that mode.
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