This commit adds support to `wasm-bindgen` to be a drop-in polyfill for
the WebIDL bindings proposal. Lots of internal refactoring has happened
previously to `wasm-bindgen` to make this possible, so this actually
ends up being a very small PR!
Most of `wasm-bindgen` is geared towards Rust-specific types and
Rust-specific support, but with the advent of WebIDL bindings this is a
standard way for a WebAssembly module to communicate its intended
interface in terms of higher level types. This PR allows `wasm-bindgen`
to be a polyfill for any WebAssembly module that has a valid WebIDL
bindings section, regardless of its producer. A standard WebIDL bindings
section is recognized in any input wasm module and that is slurped up
into wasm-bindgen's own internal data structures to get processed in the
same way that all Rust imports/exports are already processed.
The workflow for `wasm-bindgen` looks the same way that it does in Rust
today. You'd execute `wasm-bindgen path/to/foo.wasm --out-dir .` which
would output a new wasm file and a JS shim with the desired interface,
and the new wasm file would be suitable for loading in MVP
implementations of WebAssembly.
Note that this isn't super thoroughly tested, so there's likely still
some lingering assumptions that `wasm-bindgen` makes (such as
`__wbindgen_malloc` and others) which will need to be patched in the
future, but the intention of this commit is to start us down a road of
becoming a drop-in polyfill for WebIDL bindings, regardless of the
source. Also note that there's not actually any producer (AFAIK) of a
WebIDL bindings custom section, so it'd be that much harder to write
tests to do so!
Support has landed in rust-lang/rust for full support for LLVM 9's
interpretation of WebAssembly threads. This commit updates our thread
transformation pass to take all this into account, namely:
* The threadign pass now runs by default and is keyed on whether memory
is shared, not off an env var.
* TLS is initialized in addition to memory on each thread.
* Stack pointer finding is tweaked to account for the TLS base also
being a mutable global.
* The build of the parallel raytrace example was updated to use today's
nightly.
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.
Ensure that we enable the new `parallel` feature in the CLI so our tools all use
parallelized parsing, but none of our specific crates need it for usage.
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.
This fixes an issue also reported to upstream (rust-lang/rust#62628) to
ensure that we parse the `final` attribute as either `r#final` or
`final`, since now the compiler is giving us `r#final` and we were
previously only accepting `final`.
The parsing here was a bit wonky, but this setup ended up working!
After this change, any import that only takes and returns ABI-safe numbers (signed
integers less than 64 bits and unrestricted floating point numbers) will be a
direct import, and will not have a little JS shim in the middle.
We don't have a great mechanism for testing the generated bindings' contents --
as opposed to its behavior -- but I manually verified that everything here does
the Right Thing and doesn't have a JS shim:
```rust
\#[wasm_bindgen]
extern "C" {
fn trivial();
fn incoming_i32() -> i32;
fn incoming_f32() -> f32;
fn incoming_f64() -> f64;
fn outgoing_i32(x: i32);
fn outgoing_f32(y: f32);
fn outgoing_f64(z: f64);
fn many(x: i32, y: f32, z: f64) -> i32;
}
```
Furthermore, I verified that when our support for emitting native `anyref` is
enabled, then we do not have a JS shim for the following import, but if it is
disabled, then we do have a JS shim:
```rust
\#[wasm_bindgen]
extern "C" {
fn works_when_anyref_support_is_enabled(v: JsValue) -> JsValue;
}
```
Fixes#1636.
