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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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As noted in #4739, legacy language emitting nan and infinity
exists, with the observation that it can be removed once asm.js
is no longer used and global NaN is available.
This commit removes that asm.js-specific code accordingly.
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The previous code was making emscripten-specific assumptions about
imports basically all coming from the `env` module.
I can't find a way to make this backwards compatible so may do a
combined roll with the emscripten-side change:
https://github.com/emscripten-core/emscripten/pull/17806
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This import was being injected and then used to implement trapping.
Rather than injecting an import that doesn't exist in the original
module we instead use the existing mechanism to implement this as
an internal helper.
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Previously we were assuming asmLibraryArg which is what emscripten
passes as the `env` import object but using this method is more
flexible and should allow wasm2js to work with import that are
not all form a single object.
The slight size increase here is just temporary until emscripten
gets updated.
See https://github.com/emscripten-core/emscripten/pull/17737
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Also, format the asmFunc call to make it more readable in the ES6
modules case.
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The switch lowering will "hoist" blocks of code into the JS switch when it can. If it can hoist some but not others, it must not fall through into those others (while it can fall through the hoisted ones - they began as nested blocks with falling-through between them). To fix this, after the hoisted ones issue a break out of the switch (which now contains all the hoisted code, so breaking out of it gets to the code right after the hoisted ones).
fixes #2300
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We don't ever emit "use asm" anymore, so this similar annotation is not really useful, it just increases size.
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This pattern-matches towers of blocks + a br_table into a JS switch. This is much smaller in code size and also avoids heavy nesting that can exceed the recursion limits of JS parsers.
This is not enough yet, because it pattern-matches very specifically. In reality, switches can look slightly different. Followup PRs will extend this. For now, this passes the test suite (what passed before - not including the massive-switch tests) + fuzzing so it's a good start.
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