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An attempt to fix the node-esm-loader related [issues](https://travis-ci.org/WebAssembly/binaryen/jobs/649056649#L22931) seen on CI currently, apparently due to CI automatically picking up a newer node LTS (12.16.0 released 2020/02/11) where the API changed.
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This is a continued effort to try and track down #2273 which came up
again and is still present in the current release binaries. Issues like
crystal-lang/crystal#4276 may indicate that C++ exceptions are just
somewhat broken with static linking when using alpine, but I've at least
locally been able to verify that upgrading the container produces
working binaries which previously segfaulted on some wasm files.
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This fixes names that would be invalid in JS, like a.b. Turns out the Go compiler emits wasm with such imports.
Also add some docs on how to use wasm2js.
Fixes #2263
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* I64ToI32Lowering - don't assume address 0 is a hardcoded location for scratch memory. Import __tempMemory__ for that.
* RemoveNonJSOps - also use __tempMemory__. Oddly here the address was a hardcoded 1024 (perhaps where the rust program put a static global?).
* Support imported ints in wasm2js, coercing them as needed.
* Add "env" import support in the tests, since now we emit imports from there.
* Make wasm2js tests split out multi-module tests using split_wast which is more robust and avoids emitting multiple outputs in one file (which makes no sense for ES6 modules)
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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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