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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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Recently we added logic to ignore effects that don't "escape" past the function call.
That is, e.g. local.set only affects the current function scope, and once the call stack
is unwound it no longer matters as an effect. This moves that logic to a shared place,
and uses it in the core Vacuum logic.
The new constructor in EffectAnalyzer receives a function and then scans it as
a whole. This works just like e.g. scanning a Block as a whole (if we see a break in
the block, that has an effect only inside it, and the Block + children doesn't have a
branch effect).
Various tests are updated so they don't optimize away trivially, by adding new
return values for them.
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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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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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A minifier would probably remove them later anyhow, but they make reading the code annoying and hard.
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That pass is very slow on unoptimized code (super-linear on the number of locals, which if unoptimized can be massive due to flatten).
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In particular, coalesce-locals is useful even if closure is run later (apparently it finds stuff closure can't).
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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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As well as i64 splitting this pass was also converting f32 to f64
at the wasm boundry. However it appears this is not actually useful
and makes somethings (such as dynamic linking) harder.
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* Emit ints as signed, so -1 isn't a big unsigned number.
* x - -c (where c is a constant) is larger than x + c in js (but not wasm)
* +(+x) => +x
* Avoid unnecessary coercions on calls, return, load, etc. - we just need coercions when entering or exiting "wasm" (not internally), and on actual operations that need them.
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Removes redundant | 0s and similar things. (Apparently closure compiler doesn't do that, so makes sense to do here.)
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(#2043)
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Also fix the fuzzer's handling of feature flags so that wasm2js can work.
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* Don't assume function types exist in legalize-js-interface.
* Properly handle (ignore) imports in RemoveNonJSOps - do not try to recurse into them.
* Run legalize-js-interface and remove-unused-module-elements in wasm2js, the first is necessary, the last is nice to have.
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cases are tricky (#2026)
leave them for later optimizers/minifiers
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Also emit the memory growth code based on memory growth, and not whether we are "use asm" or not.
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This replaces the multiple asm.js tables (of power-of-2 size) with a single simple table.
Also supports importing the table.
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Early work for #1929
* Leave core wasm module - the "asm.js function" - to Wasm2JSBuilder, and add Wasm2JSGlue which emits the code before and after that. Currently that's some ES6 code, but we may want to change that later.
* Add add AssertionEmitter class for the sole purpose of emitting modules + assertions for testing. This avoids some hacks from before like starting from index 1 (assuming the module at first position was already parsed and printed) and printing of the f32Equal etc. functions not at the very top (which was due to technical limitations before).
Logic-wise, there should be no visible change, except some whitespace and reodering, and that I made the exceptions print out the source of the assertion that failed from the wast:
-if (!check2()) fail2();
+if (!check2()) throw 'assertion failed: ( assert_return ( call add ( i32.const 1 ) ( i32.const 1 ) ) ( i32.const 2 ) )';
(fail2 etc. did not exist, and seems to just have given a unique number for each assertion?)
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* Rename the `wasm2asm` tool to `wasm2js`
This commit performs a relatively simple rename of the `wasm2asm` tool to
`wasm2js`. The functionality of the tool doesn't change just yet but it's
intended that we'll start generating an ES module instead of just an `asm.js`
function soon.
* wasm2js: Support `*.wasm` input files
Previously `wasm2js` only supported `*.wast` files but to make it a bit easier
to use in tooling pipelines this commit adds support for reading in a `*.wasm`
file directly. Determining which parser to use depends on the input filename,
where the binary parser is used with `*.wasm` files and the wast parser is used
for all other files.
* wasm2js: Emit ESM imports/exports by default
This commit alters the default behavior of `wasm2js` to emit an ESM by default,
either importing items from the environment or exporting. Items like
initialization of memory are also handled here.
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