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Rename instructions `extern.internalize` into `any.convert_extern` and
`extern.externalize` into `extern.convert_any` to follow more closely
the spec. This was changed in
https://github.com/WebAssembly/gc/issues/432.
The legacy name is still accepted in text inputs and in the C and JS
APIs.
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JS engines print i31ref as just a number, so we need a small regex to
standardize the representation (similar to what we do for funcrefs on
the code above).
On the C++ side, make it actually print the i31ref rather than treat it
like a generic reference (for whom we only print "object"). To do that
we must unwrap an externalized i31 as necessary, and add a case for
i31 in the printing logic.
Also move that printing logic to its own function, as it was starting to
get quite long.
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We previously supported a non-standard `(func "name" ...` syntax for declaring
functions exported with the quoted name. Since that is not part of the standard
text format, drop support for it, replacing it with the standard `(func $name
(export "name") ...` syntax instead.
Also replace our other usage of the quoted form in our text output, which was
where we quoted names containing characters that are not allowed to appear in
standard names. To handle that case, adjust our output from `"$name"` to
`$"name"`, which is the standards-track way of supporting such names. Also fix
how we detect non-standard name characters to match the spec.
Update the lit test output generation script to account for these changes,
including by making the `$` prefix on names mandatory. This causes the script to
stop interpreting declarative element segments with the `(elem declare ...`
syntax as being named "declare", so prevent our generated output from regressing
by counting "declare" as a name in the script.
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Replace i31.new with ref.i31 in the printer, tests, and source code. Continue
parsing i31.new for the time being to allow a graceful transition. Also update
the JS API to reflect the new instruction name.
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The encoding here is simple: we store i31 values in the literal.i32
field. The top bit says if a value exists, which means literal.i32 == 0 is the
same as null.
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