Don't necessarily require a filesystem to execute `wasm-bindgen`,
allowing the `wasm-bindgen-cli-support` crate to be compiled to
WebAssembly, for example, and possibly run `wasm-bindgen` in your
browser! For now this is largely just an internal refactoring and won't
result in many use cases, but it felt like a good refactoring to have
regardless.
Instead of assuming names like `URL` and `Request` are defined, instead
check to see if they exist first and otherwise skip the checks that
reference them.
This commit updates the `walrus` dependency with recent upstream API
changes in `walrus` itself, namely updates to passive segements and how
memory data segments are handled
In LLVM 9 LLD has been updated to emit shared memory and passive
segments by default for threaded code, and `__wasm_init_memory` is a
function exported used to initialize memory. Update our
transform/runtime here to hook up all those wires correctly.
Closes#1631
* Use "legacy" instead of "stable" since `futures 0.1` is quicly
becoming "legacy"
* Rename "atomics" to "legacy_atomics" to leave room for the
libstd-based futures atomics version.
* Rename "polyfill" to "wait_async_polyfill" to specify what it's
polyfilling.
* Remove now-unneeded `State` enum
* Remove timeout argument from polyfill since we don't need it
* Call `Atomics.waitAsync` if it's available instead of using our polyfill
* Remove some extraneous dead code from the polyfill
* Add a `val: i32` argument to the polyfill
* Simplify the flow of futures with `Package` since `waitAsync` handles
all the heavy lifting for us.
* Remove `Arc<Package>` and just use `Package`
* Remove `RefCell` from inside of `Package` now that it is no longer
needed.
