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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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We run flatten there, which lets us simplify things a lot. Turns out that for assertions we didn't run it, which is why we still needed the old non-flat code paths. This adds flatten there and removes that old code and assumptions.
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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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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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