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When generating assertions, traverse the `WASTScript` data structure rather than
interleaving assertion parsing with emitting.
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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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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 helps quite a lot on wasm2js.
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In JS a reinterpret is especially expensive, as we implement it as a write to a temp buffer and a read using another view. This finds places where we load a value from memory, then reinterpret it later - in that case, we can load it using another view, at the cost of another load and another local.
This is helpful on things like Box2D, where there are many reinterprets due to the main 2D vector class being an union over two floats/ints, and LLVM likes to do a single i64 load of them.
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When loading a boolean, prefer the signed heap (which is more commonly used, and may be faster).
We never use HEAPU32 (HEAP32 is always enough), just remove it.
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We flatten for the i64 lowering etc. passes, and it is worth optimizing afterwards, to clean up stuff they created. That is run if the user ran wasm2js with an optimization level (like wasm2js -O3).
Split the test files to check both optimized and unoptimized code.
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